diff --git a/README.md b/README.md
index 3d4ac212..d29155de 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ The v4 SDK provides a modern, immutable client with enhanced type safety and imp
 #### Gradle (Kotlin DSL)
 ```kotlin
 dependencies {
-    implementation("com.chargebee:chargebee-java:4.0.0-beta.1")
+    implementation("com.chargebee:chargebee-java:4.0.0")
 }
 ```
 
@@ -56,7 +56,7 @@ dependencies {
 <dependency>
   <groupId>com.chargebee</groupId>
   <artifactId>chargebee-java</artifactId>
-  <version>4.0.0-beta.2</version>
+  <version>4.0.0</version>
 </dependency>
 ```
 
@@ -138,13 +138,13 @@ ChargebeeClient client = ChargebeeClient.builder()
 
 #### Create and list customers (sync)
 ```java
-import com.chargebee.core.services.CustomerService;
-import com.chargebee.core.models.customer.params.CustomerCreateParams;
-import com.chargebee.core.models.customer.params.CustomerListParams;
-import com.chargebee.core.responses.customer.CustomerCreateResponse;
-import com.chargebee.core.responses.customer.CustomerListResponse;
+import com.chargebee.v4.services.CustomerService;
+import com.chargebee.v4.models.customer.params.CustomerCreateParams;
+import com.chargebee.v4.models.customer.params.CustomerListParams;
+import com.chargebee.v4.models.customer.responses.CustomerCreateResponse;
+import com.chargebee.v4.models.customer.responses.CustomerListResponse;
 
-CustomerService customers = client.customer();
+CustomerService customers = client.customers();
 
 CustomerCreateResponse created = customers.create(
     CustomerCreateParams.builder()
@@ -161,7 +161,7 @@ CustomerCreateResponse created = customers.create(
                 .build()
         )
         .build()
-).get();
+);
 
 CustomerListResponse list = customers.list(
     CustomerListParams.builder()
@@ -194,7 +194,7 @@ ChargebeeClient client = ChargebeeClient.builder()
 ```java
 import com.chargebee.v4.client.request.RequestOptions;
 
-CustomerService scoped = customers.withOptions(
+CustomerService scoped = client.customers().withOptions(
     RequestOptions.builder()
         .header("Idempotency-Key", "req-123")
         .maxNetworkRetries(2)
@@ -215,6 +215,350 @@ future.thenAccept(resp -> {
 });
 ```
 
+### Exception Handling
+
+The library provides a comprehensive exception hierarchy with **strongly-typed error enums** to handle different types of errors that may occur during API operations.
+
+#### Exception Hierarchy
+
+All Chargebee exceptions extend from `ChargebeeException`, which is an unchecked exception:
+
+```
+ChargebeeException (unchecked - extends RuntimeException)
+├── ConfigurationException (setup/config errors)
+└── TransportException (runtime API errors)
+      ├── NetworkException (DNS failures, connection refused)
+      ├── TimeoutException (connect/read timeouts)
+      └── HttpException (HTTP status code errors: 4xx, 5xx)
+            ├── ClientErrorException (4xx errors)
+            ├── ServerErrorException (5xx errors)
+            └── APIException (Chargebee API errors)
+                  ├── InvalidRequestException (validation errors)
+                  ├── PaymentException (payment-related errors)
+                  ├── OperationFailedException (business logic errors)
+                  ├── BatchAPIException (batch operation errors)
+                  └── UbbBatchIngestionInvalidRequestException (batch ingestion errors)
+```
+
+#### Exception Types
+
+- **`ChargebeeException`**: Base exception for all SDK errors - catch-all for any Chargebee SDK error
+- **`ConfigurationException`**: Thrown when SDK configuration is invalid (missing API key, invalid URL, etc.)
+- **`TransportException`**: Base exception for all transport-layer failures (network issues, timeouts, etc.)
+- **`HttpException`**: Thrown for HTTP error status codes (4xx, 5xx) - contains status code and response
+- **`ClientErrorException`**: HTTP 4xx client errors (bad request, unauthorized, not found, etc.)
+- **`ServerErrorException`**: HTTP 5xx server errors (internal server error, service unavailable, etc.)
+- **`APIException`**: Base exception for Chargebee API errors - includes error type, API error code, and parameters
+- **`InvalidRequestException`**: Invalid parameters, missing required fields, or validation errors (type: `invalid_request`)
+- **`PaymentException`**: Payment failures such as card declined, insufficient funds, etc. (type: `payment`)
+- **`OperationFailedException`**: Business logic violations or state conflicts (type: `operation_failed`)
+- **`BatchAPIException`**: Errors specific to batch API operations
+- **`UbbBatchIngestionInvalidRequestException`**: Errors specific to UBB batch ingestion operations
+
+#### Strongly-Typed Error Enums
+
+The v4 SDK provides strongly-typed enums for error handling, making it easier to write type-safe error handling code:
+
+##### ErrorType Enum
+Represents the type of error returned by the API:
+```java
+import com.chargebee.v4.exceptions.ErrorType;
+
+// Available values:
+ErrorType.INVALID_REQUEST   // Validation and request errors
+ErrorType.PAYMENT           // Payment-related errors  
+ErrorType.OPERATION_FAILED  // Business logic errors
+ErrorType.UNTYPED           // Untyped errors
+ErrorType._UNKNOWN          // Unknown/new error types (forward compatibility)
+```
+
+##### Per-HTTP-Status API Error Code Enums
+Each HTTP status code has its own enum with specific error codes:
+
+| Enum | HTTP Status | Example Error Codes |
+|------|-------------|---------------------|
+| `BadRequestApiErrorCode` | 400 | `DUPLICATE_ENTRY`, `INVALID_REQUEST`, `PAYMENT_PROCESSING_FAILED`, `PARAM_WRONG_VALUE` |
+| `UnauthorizedApiErrorCode` | 401 | `API_AUTHENTICATION_FAILED`, `BASIC_AUTHENTICATION_FAILED` |
+| `ForbiddenApiErrorCode` | 403 | `REQUEST_BLOCKED`, `API_AUTHORIZATION_FAILED` |
+| `NotFoundApiErrorCode` | 404 | `RESOURCE_NOT_FOUND`, `SITE_NOT_FOUND` |
+| `ConflictApiErrorCode` | 409 | `INVALID_STATE_FOR_REQUEST` |
+| `TooManyRequestsApiErrorCode` | 429 | `REQUEST_LIMIT_EXCEEDED`, `OPERATION_LIMIT_EXCEEDED` |
+| `InternalServerErrorApiErrorCode` | 500 | `INTERNAL_ERROR`, `INTERNAL_TEMPORARY_ERROR` |
+| `ServiceUnavailableApiErrorCode` | 503 | `SITE_NOT_READY`, `SITE_MIGRATING`, `SITE_UNDER_MAINTENANCE` |
+
+All enums include an `_UNKNOWN` value for forward compatibility when new error codes are added by the API.
+
+#### v4 SDK Exception Handling Examples
+
+##### Basic exception handling with enums
+```java
+import com.chargebee.v4.exceptions.*;
+import com.chargebee.v4.exceptions.codes.ApiErrorCode;
+import com.chargebee.v4.exceptions.codes.BadRequestApiErrorCode;
+import com.chargebee.v4.services.CustomerService;
+import com.chargebee.v4.models.customer.params.CustomerCreateParams;
+
+CustomerService customers = client.customers();
+
+try {
+    CustomerCreateResponse created = customers.create(
+        CustomerCreateParams.builder()
+            .email("invalid-email")  // Invalid email format
+            .build()
+    );
+} catch (InvalidRequestException e) {
+    // getApiErrorCode() returns a strongly-typed ApiErrorCode enum
+    ApiErrorCode errorCode = e.getApiErrorCode();
+    
+    // Cast to specific enum based on HTTP status code
+    if (errorCode instanceof BadRequestApiErrorCode) {
+        BadRequestApiErrorCode code = (BadRequestApiErrorCode) errorCode;
+        if (code == BadRequestApiErrorCode.DUPLICATE_ENTRY) {
+            System.err.println("Resource already exists!");
+        } else if (code == BadRequestApiErrorCode.PARAM_WRONG_VALUE) {
+            System.err.println("Invalid parameter: " + e.getParams());
+        }
+    }
+} catch (PaymentException e) {
+    ApiErrorCode errorCode = e.getApiErrorCode();
+    
+    if (errorCode instanceof BadRequestApiErrorCode) {
+        BadRequestApiErrorCode code = (BadRequestApiErrorCode) errorCode;
+        if (code == BadRequestApiErrorCode.PAYMENT_PROCESSING_FAILED) {
+            System.err.println("Payment failed. Please try again.");
+        } else if (code == BadRequestApiErrorCode.PAYMENT_METHOD_NOT_PRESENT) {
+            System.err.println("No payment method on file.");
+        }
+    }
+} catch (APIException e) {
+    // Handle other API errors
+    System.err.println("API error: " + e.getMessage());
+    System.err.println("Error type: " + e.getErrorType());
+} catch (TransportException e) {
+    // Handle network/transport errors
+    System.err.println("Transport error: " + e.getMessage());
+}
+```
+
+##### Using switch with ErrorType enum
+```java
+try {
+    // API operation
+} catch (APIException e) {
+    switch (e.getErrorType()) {
+        case INVALID_REQUEST:
+            System.err.println("Invalid request: " + e.getMessage());
+            break;
+        case PAYMENT:
+            System.err.println("Payment error: " + e.getMessage());
+            break;
+        case OPERATION_FAILED:
+            System.err.println("Operation failed: " + e.getMessage());
+            break;
+        default:
+            System.err.println("Unknown error type: " + e.getType());
+    }
+}
+```
+
+##### Handling specific error codes
+```java
+import com.chargebee.v4.exceptions.*;
+import com.chargebee.v4.exceptions.codes.ApiErrorCode;
+import com.chargebee.v4.exceptions.codes.BadRequestApiErrorCode;
+
+try {
+        client.subscriptions().create(params);
+} catch (APIException e) {
+    ApiErrorCode errorCode = e.getApiErrorCode();
+    
+    // Check if it's a BadRequest error code
+    if (errorCode instanceof BadRequestApiErrorCode) {
+        BadRequestApiErrorCode code = (BadRequestApiErrorCode) errorCode;
+        switch (code) {
+            case DUPLICATE_ENTRY:
+                System.err.println("Resource already exists");
+                break;
+            case RESOURCE_LIMIT_EXHAUSTED:
+                System.err.println("Limit reached, please upgrade your plan");
+                break;
+            case PAYMENT_PROCESSING_FAILED:
+                System.err.println("Payment failed, please update payment method");
+                break;
+            case _UNKNOWN:
+                // Unknown error code - use raw value for logging
+                System.err.println("Unknown error code: " + e.getApiErrorCodeRaw());
+                break;
+            default:
+                System.err.println("Error: " + e.getMessage());
+        }
+    }
+}
+```
+
+##### Checking for unknown error types (forward compatibility)
+```java
+try {
+    // API operation
+} catch (APIException e) {
+    ErrorType errorType = e.getErrorType();
+    
+    if (!errorType.isKnown()) {
+        // New error type added by API that SDK doesn't know about yet
+        System.err.println("New error type encountered: " + e.getType());
+        // Log for investigation, but handle gracefully
+    }
+    
+    ApiErrorCode errorCode = e.getApiErrorCode();
+    if (errorCode != null && !errorCode.isKnown()) {
+        // New error code - handle gracefully using raw value
+        System.err.println("New error code: " + e.getApiErrorCodeRaw());
+    }
+}
+```
+
+##### Handling HTTP-level errors
+```java
+import com.chargebee.v4.exceptions.ClientErrorException;
+import com.chargebee.v4.exceptions.ServerErrorException;
+import com.chargebee.v4.exceptions.HttpException;
+
+try {
+    CustomerCreateResponse response = client.customers().create(params);
+} catch (ClientErrorException e) {
+    // Handle 4xx client errors
+    if (e.isUnauthorized()) {
+        System.err.println("Authentication failed. Check your API key.");
+    } else if (e.isNotFound()) {
+        System.err.println("Resource not found.");
+    } else if (e.isTooManyRequests()) {
+        System.err.println("Rate limit exceeded. Retry after some time.");
+    } else {
+        System.err.println("Client error: " + e.getStatusCode());
+    }
+} catch (ServerErrorException e) {
+    // Handle 5xx server errors (often retryable)
+    if (e.isRetryable()) {
+        System.err.println("Server error. Consider retrying: " + e.getMessage());
+    }
+} catch (HttpException e) {
+    System.err.println("HTTP error: " + e.getStatusCode());
+}
+catch (Exception e) {
+    throw new RuntimeException(e);
+}
+```
+
+##### Error Response Attributes
+
+The `APIException` class provides typed access to all error response attributes:
+
+| Attribute | Method | Description |
+|-----------|--------|-------------|
+| `message` | `getMessage()` | Descriptive error information (for developer consumption, not for end users) |
+| `type` | `getType()` / `getErrorType()` | Error type grouping: `payment`, `invalid_request`, `operation_failed` |
+| `api_error_code` | `getApiErrorCode()` / `getApiErrorCodeRaw()` | Strongly-typed enum (`ApiErrorCode`) or raw string for error handling |
+| `param` | `getParam()` / `getParams()` | Parameter name(s) if error is parameter-specific |
+| `error_cause_id` | `getErrorCauseId()` | Chargebee-defined code for standardizing errors across gateways |
+
+##### Extracting detailed error information
+```java
+try {
+    // API operation
+} catch (APIException e) {
+    // Get HTTP status code
+    int statusCode = e.getStatusCode();
+    
+    // Get error type as enum (type-safe)
+    ErrorType errorType = e.getErrorType();
+    
+    // Get error type as raw string
+    String type = e.getType();
+    
+    // Get API error code as typed enum
+    ApiErrorCode apiErrorCode = e.getApiErrorCode();
+    
+    // Get API error code as raw string (for logging)
+    String apiErrorCodeRaw = e.getApiErrorCodeRaw();
+    
+    // Get error message (for developer consumption)
+    String message = e.getMessage();
+    
+    // Get parameter name(s) that caused the error
+    String param = e.getParam();           // Single param (convenience)
+    List<String> params = e.getParams();   // All params
+    
+    // Get error cause ID (for gateway error standardization)
+    String errorCauseId = e.getErrorCauseId();
+    
+    // Get full JSON response for debugging
+    String jsonResponse = e.getJsonResponse();
+    
+    // Get full HTTP response object
+    Response response = e.getResponse();
+    
+    System.err.println("Error details: " + e.toString());
+}
+```
+
+##### Handling gateway errors with error_cause_id
+```java
+try {
+    // Payment operation
+} catch (PaymentException e) {
+    // error_cause_id helps standardize errors across different payment gateways
+    String errorCauseId = e.getErrorCauseId();
+    
+    if (errorCauseId != null) {
+        // Use error_cause_id for consistent handling across gateways
+        System.err.println("Gateway error cause: " + errorCauseId);
+        
+    }
+    
+    // Check the specific API error code using typed enum
+    ApiErrorCode errorCode = e.getApiErrorCode();
+    if (errorCode instanceof BadRequestApiErrorCode) {
+        BadRequestApiErrorCode code = (BadRequestApiErrorCode) errorCode;
+        if (code == BadRequestApiErrorCode.PAYMENT_PROCESSING_FAILED) {
+            // Handle payment failure
+        }
+    }
+}
+```
+
+##### Async exception handling
+```java
+import java.util.concurrent.CompletableFuture;
+
+CompletableFuture<CustomerCreateResponse> futureCustomer = customers.create(params);
+
+futureCustomer
+    .thenAccept(customer -> {
+        System.out.println("Customer created: " + customer.getCustomer().getId());
+    })
+    .exceptionally(throwable -> {
+        if (throwable.getCause() instanceof InvalidRequestException) {
+            InvalidRequestException e = (InvalidRequestException) throwable.getCause();
+            ApiErrorCode errorCode = e.getApiErrorCode();
+            
+            if (errorCode instanceof BadRequestApiErrorCode) {
+                BadRequestApiErrorCode code = (BadRequestApiErrorCode) errorCode;
+                if (code == BadRequestApiErrorCode.DUPLICATE_ENTRY) {
+                    System.err.println("Customer already exists");
+                }
+            } else {
+                System.err.println("Validation error: " + e.getMessage());
+            }
+        } else if (throwable.getCause() instanceof APIException) {
+            APIException e = (APIException) throwable.getCause();
+            System.err.println("API error: " + e.getApiErrorCodeRaw());
+        } else {
+            System.err.println("Unexpected error: " + throwable.getMessage());
+        }
+        return null;
+    });
+```
+
 ### v3 SDK Examples
 
 #### Create a subscription
diff --git a/build.gradle.kts b/build.gradle.kts
index 17a645f7..70f6085a 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -6,7 +6,7 @@ plugins {
 }
 
 group = "com.chargebee"
-version = "4.0.0-beta.2"
+version = "4.0.0"
 description = "Next-gen Java client library for ChargeBee API"
 
 // Project metadata
diff --git a/dist/chargebee-java-4.0.0-beta.2-javadoc.jar b/dist/chargebee-java-4.0.0-beta.2-javadoc.jar
deleted file mode 100644
index 47fa0c9a..00000000
Binary files a/dist/chargebee-java-4.0.0-beta.2-javadoc.jar and /dev/null differ
diff --git a/dist/chargebee-java-4.0.0-beta.2-sources.jar b/dist/chargebee-java-4.0.0-beta.2-sources.jar
deleted file mode 100644
index 13f24807..00000000
Binary files a/dist/chargebee-java-4.0.0-beta.2-sources.jar and /dev/null differ
diff --git a/dist/chargebee-java-4.0.0-beta.2.jar b/dist/chargebee-java-4.0.0-beta.2.jar
deleted file mode 100644
index acaac252..00000000
Binary files a/dist/chargebee-java-4.0.0-beta.2.jar and /dev/null differ
diff --git a/dist/chargebee-java-4.0.0-javadoc.jar b/dist/chargebee-java-4.0.0-javadoc.jar
new file mode 100644
index 00000000..590a3a0c
Binary files /dev/null and b/dist/chargebee-java-4.0.0-javadoc.jar differ
diff --git a/dist/chargebee-java-4.0.0-sources.jar b/dist/chargebee-java-4.0.0-sources.jar
new file mode 100644
index 00000000..d1648189
Binary files /dev/null and b/dist/chargebee-java-4.0.0-sources.jar differ
diff --git a/dist/chargebee-java-4.0.0.jar b/dist/chargebee-java-4.0.0.jar
new file mode 100644
index 00000000..ee282e8b
Binary files /dev/null and b/dist/chargebee-java-4.0.0.jar differ
diff --git a/docs/MIGRATION_GUIDE.md b/docs/MIGRATION_GUIDE.md
index 84ebe957..eb2d03d8 100644
--- a/docs/MIGRATION_GUIDE.md
+++ b/docs/MIGRATION_GUIDE.md
@@ -34,7 +34,7 @@ The v4 SDK provides a modern, immutable client with enhanced type safety and imp
 <dependency>
   <groupId>com.chargebee</groupId>
   <artifactId>chargebee-java</artifactId>
-  <version>4.0.0-beta.1</version>
+  <version>4.0.0</version>
 </dependency>
 ```
 
diff --git a/src/main/java/com/chargebee/v4/client/ChargebeeClient.java b/src/main/java/com/chargebee/v4/client/ChargebeeClient.java
index c62bfd9f..a5ec524e 100644
--- a/src/main/java/com/chargebee/v4/client/ChargebeeClient.java
+++ b/src/main/java/com/chargebee/v4/client/ChargebeeClient.java
@@ -3,6 +3,11 @@
 import com.chargebee.v4.client.request.RequestContext;
 import com.chargebee.v4.client.request.RequestInterceptor;
 import com.chargebee.v4.client.request.RequestWrap;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.exceptions.ConfigurationException;
+import com.chargebee.v4.exceptions.NetworkException;
+import com.chargebee.v4.exceptions.TimeoutException;
+import com.chargebee.v4.exceptions.TransportException;
 import com.chargebee.v4.internal.RetryConfig;
 import com.chargebee.v4.transport.*;
 import com.chargebee.v4.transport.Transport;
@@ -105,9 +110,9 @@ public String getBaseUrl() {
      * @param path the API path (e.g., "/customers")
      * @param queryParams optional query parameters
      * @return the HTTP response
-     * @throws Exception for network, timeout, configuration failures, or interceptor errors
+     * @throws ChargebeeException for network, timeout, configuration failures, or interceptor errors
      */
-    public Response get(String path, Map<String, List<String>> queryParams) throws Exception {
+    public Response get(String path, Map<String, List<String>> queryParams) throws ChargebeeException {
         Map<String, Object> objectParams = new HashMap<>(queryParams);
         String fullUrl = UrlBuilder.buildUrl(getBaseUrl(), path, objectParams);
         Request.Builder builder = Request.builder()
@@ -126,9 +131,9 @@ public Response get(String path, Map<String, List<String>> queryParams) throws E
      * 
      * @param path the API path (e.g., "/customers")
      * @return the HTTP response
-     * @throws Exception for network, timeout, configuration failures, or interceptor errors
+     * @throws ChargebeeException for network, timeout, configuration failures, or interceptor errors
      */
-    public Response get(String path) throws Exception {
+    public Response get(String path) throws ChargebeeException {
         return get(path, Collections.emptyMap());
     }
     
@@ -169,9 +174,9 @@ public CompletableFuture<Response> getAsync(String path) {
      * @param path the API path (e.g., "/customers")
      * @param formData the form data to send
      * @return the HTTP response
-     * @throws Exception for network, timeout, configuration failures, or interceptor errors
+     * @throws ChargebeeException for network, timeout, configuration failures, or interceptor errors
      */
-    public Response post(String path, Map<String, Object> formData) throws Exception {
+    public Response post(String path, Map<String, Object> formData) throws ChargebeeException {
         String fullUrl = UrlBuilder.buildUrl(getBaseUrl(), path, null);
         Request.Builder builder = Request.builder()
                 .method("POST")
@@ -191,9 +196,9 @@ public Response post(String path, Map<String, Object> formData) throws Exception
      * @param path the API path (e.g., "/customers")
      * @param jsonData the JSON data to send
      * @return the HTTP response
-     * @throws Exception for network, timeout, configuration failures, or interceptor errors
+     * @throws ChargebeeException for network, timeout, configuration failures, or interceptor errors
      */
-    public Response postJson(String path, String jsonData) throws Exception {
+    public Response postJson(String path, String jsonData) throws ChargebeeException {
         String fullUrl = UrlBuilder.buildUrl(getBaseUrl(), path, null);
         Request.Builder builder = Request.builder()
                 .method("POST")
@@ -252,7 +257,7 @@ public CompletableFuture<Response> postJsonAsync(String path, String jsonData) {
     /**
      * Execute a request with optional interceptor.
      */
-    public Response executeWithInterceptor(Request request) throws Exception {
+    public Response executeWithInterceptor(Request request) throws ChargebeeException {
         if (requestInterceptor != null) {
             RequestWrap requestWrap = new RequestWrap(this, request);
             return requestInterceptor.handleRequest(requestWrap);
@@ -276,7 +281,7 @@ public CompletableFuture<Response> executeWithInterceptorAsync(Request request)
     /**
      * Send a request with retry logic based on the configured RetryConfig.
      */
-    public Response sendWithRetry(Request request) throws TransportException {
+    public Response sendWithRetry(Request request) {
         Request enrichedRequest = addDefaultHeaders(request);
 
         Integer overrideRetries = enrichedRequest.getMaxNetworkRetriesOverride();
diff --git a/src/main/java/com/chargebee/v4/client/ClientMethods.java b/src/main/java/com/chargebee/v4/client/ClientMethods.java
index ab475b0f..7a8ce455 100644
--- a/src/main/java/com/chargebee/v4/client/ClientMethods.java
+++ b/src/main/java/com/chargebee/v4/client/ClientMethods.java
@@ -1,166 +1,166 @@
 package com.chargebee.v4.client;
 
-import com.chargebee.v4.core.services.GiftService;
+import com.chargebee.v4.services.GiftService;
 
-import com.chargebee.v4.core.services.CsvTaxRuleService;
+import com.chargebee.v4.services.CsvTaxRuleService;
 
-import com.chargebee.v4.core.services.UsageService;
+import com.chargebee.v4.services.UsageService;
 
-import com.chargebee.v4.core.services.TimeMachineService;
+import com.chargebee.v4.services.TimeMachineService;
 
-import com.chargebee.v4.core.services.BusinessEntityService;
+import com.chargebee.v4.services.BusinessEntityService;
 
-import com.chargebee.v4.core.services.OfferEventService;
+import com.chargebee.v4.services.OfferEventService;
 
-import com.chargebee.v4.core.services.InAppSubscriptionService;
+import com.chargebee.v4.services.InAppSubscriptionService;
 
-import com.chargebee.v4.core.services.Pc2MigrationService;
+import com.chargebee.v4.services.Pc2MigrationService;
 
-import com.chargebee.v4.core.services.CreditNoteService;
+import com.chargebee.v4.services.CreditNoteService;
 
-import com.chargebee.v4.core.services.CouponSetService;
+import com.chargebee.v4.services.CouponSetService;
 
-import com.chargebee.v4.core.services.QuoteService;
+import com.chargebee.v4.services.QuoteService;
 
-import com.chargebee.v4.core.services.Pc2MigrationItemService;
+import com.chargebee.v4.services.Pc2MigrationItemService;
 
-import com.chargebee.v4.core.services.EstimateService;
+import com.chargebee.v4.services.EstimateService;
 
-import com.chargebee.v4.core.services.VariantService;
+import com.chargebee.v4.services.VariantService;
 
-import com.chargebee.v4.core.services.Pc2MigrationItemFamilyService;
+import com.chargebee.v4.services.Pc2MigrationItemFamilyService;
 
-import com.chargebee.v4.core.services.PaymentSourceService;
+import com.chargebee.v4.services.PaymentSourceService;
 
-import com.chargebee.v4.core.services.RecordedPurchaseService;
+import com.chargebee.v4.services.RecordedPurchaseService;
 
-import com.chargebee.v4.core.services.PlanService;
+import com.chargebee.v4.services.PlanService;
 
-import com.chargebee.v4.core.services.ExportService;
+import com.chargebee.v4.services.ExportService;
 
-import com.chargebee.v4.core.services.OrderService;
+import com.chargebee.v4.services.OrderService;
 
-import com.chargebee.v4.core.services.ItemService;
+import com.chargebee.v4.services.ItemService;
 
-import com.chargebee.v4.core.services.CustomerEntitlementService;
+import com.chargebee.v4.services.CustomerEntitlementService;
 
-import com.chargebee.v4.core.services.PersonalizedOfferService;
+import com.chargebee.v4.services.PersonalizedOfferService;
 
-import com.chargebee.v4.core.services.OmnichannelSubscriptionService;
+import com.chargebee.v4.services.OmnichannelSubscriptionService;
 
-import com.chargebee.v4.core.services.OmnichannelSubscriptionItemService;
+import com.chargebee.v4.services.OmnichannelSubscriptionItemService;
 
-import com.chargebee.v4.core.services.RampService;
+import com.chargebee.v4.services.RampService;
 
-import com.chargebee.v4.core.services.OmnichannelOneTimeOrderService;
+import com.chargebee.v4.services.OmnichannelOneTimeOrderService;
 
-import com.chargebee.v4.core.services.DifferentialPriceService;
+import com.chargebee.v4.services.DifferentialPriceService;
 
-import com.chargebee.v4.core.services.EntitlementService;
+import com.chargebee.v4.services.EntitlementService;
 
-import com.chargebee.v4.core.services.AdditionalBillingLogiqService;
+import com.chargebee.v4.services.AdditionalBillingLogiqService;
 
-import com.chargebee.v4.core.services.SubscriptionSettingService;
+import com.chargebee.v4.services.SubscriptionSettingService;
 
-import com.chargebee.v4.core.services.SiteMigrationDetailService;
+import com.chargebee.v4.services.SiteMigrationDetailService;
 
-import com.chargebee.v4.core.services.PaymentIntentService;
+import com.chargebee.v4.services.PaymentIntentService;
 
-import com.chargebee.v4.core.services.PaymentScheduleSchemeService;
+import com.chargebee.v4.services.PaymentScheduleSchemeService;
 
-import com.chargebee.v4.core.services.CardService;
+import com.chargebee.v4.services.CardService;
 
-import com.chargebee.v4.core.services.AttachedItemService;
+import com.chargebee.v4.services.AttachedItemService;
 
-import com.chargebee.v4.core.services.UsageEventService;
+import com.chargebee.v4.services.UsageEventService;
 
-import com.chargebee.v4.core.services.PriceVariantService;
+import com.chargebee.v4.services.PriceVariantService;
 
-import com.chargebee.v4.core.services.FullExportService;
+import com.chargebee.v4.services.FullExportService;
 
-import com.chargebee.v4.core.services.VirtualBankAccountService;
+import com.chargebee.v4.services.VirtualBankAccountService;
 
-import com.chargebee.v4.core.services.AddonService;
+import com.chargebee.v4.services.AddonService;
 
-import com.chargebee.v4.core.services.TpSiteUserService;
+import com.chargebee.v4.services.TpSiteUserService;
 
-import com.chargebee.v4.core.services.ConfigurationService;
+import com.chargebee.v4.services.ConfigurationService;
 
-import com.chargebee.v4.core.services.PricingPageSessionService;
+import com.chargebee.v4.services.PricingPageSessionService;
 
-import com.chargebee.v4.core.services.Pc2MigrationItemPriceService;
+import com.chargebee.v4.services.Pc2MigrationItemPriceService;
 
-import com.chargebee.v4.core.services.RuleService;
+import com.chargebee.v4.services.RuleService;
 
-import com.chargebee.v4.core.services.SubscriptionService;
+import com.chargebee.v4.services.SubscriptionService;
 
-import com.chargebee.v4.core.services.MediaService;
+import com.chargebee.v4.services.MediaService;
 
-import com.chargebee.v4.core.services.BusinessProfileService;
+import com.chargebee.v4.services.BusinessProfileService;
 
-import com.chargebee.v4.core.services.PromotionalCreditService;
+import com.chargebee.v4.services.PromotionalCreditService;
 
-import com.chargebee.v4.core.services.BrandConfigurationService;
+import com.chargebee.v4.services.BrandConfigurationService;
 
-import com.chargebee.v4.core.services.WebhookEndpointService;
+import com.chargebee.v4.services.WebhookEndpointService;
 
-import com.chargebee.v4.core.services.FeatureService;
+import com.chargebee.v4.services.FeatureService;
 
-import com.chargebee.v4.core.services.UnbilledChargesSettingService;
+import com.chargebee.v4.services.UnbilledChargesSettingService;
 
-import com.chargebee.v4.core.services.CurrencyService;
+import com.chargebee.v4.services.CurrencyService;
 
-import com.chargebee.v4.core.services.EventService;
+import com.chargebee.v4.services.EventService;
 
-import com.chargebee.v4.core.services.UsageFileService;
+import com.chargebee.v4.services.UsageFileService;
 
-import com.chargebee.v4.core.services.NonSubscriptionService;
+import com.chargebee.v4.services.NonSubscriptionService;
 
-import com.chargebee.v4.core.services.ResourceMigrationService;
+import com.chargebee.v4.services.ResourceMigrationService;
 
-import com.chargebee.v4.core.services.ProductService;
+import com.chargebee.v4.services.ProductService;
 
-import com.chargebee.v4.core.services.CouponCodeService;
+import com.chargebee.v4.services.CouponCodeService;
 
-import com.chargebee.v4.core.services.AddressService;
+import com.chargebee.v4.services.AddressService;
 
-import com.chargebee.v4.core.services.CouponService;
+import com.chargebee.v4.services.CouponService;
 
-import com.chargebee.v4.core.services.PortalSessionService;
+import com.chargebee.v4.services.PortalSessionService;
 
-import com.chargebee.v4.core.services.ItemPriceService;
+import com.chargebee.v4.services.ItemPriceService;
 
-import com.chargebee.v4.core.services.OfferFulfillmentService;
+import com.chargebee.v4.services.OfferFulfillmentService;
 
-import com.chargebee.v4.core.services.HostedPageService;
+import com.chargebee.v4.services.HostedPageService;
 
-import com.chargebee.v4.core.services.PurchaseService;
+import com.chargebee.v4.services.PurchaseService;
 
-import com.chargebee.v4.core.services.PaymentVoucherService;
+import com.chargebee.v4.services.PaymentVoucherService;
 
-import com.chargebee.v4.core.services.ItemFamilyService;
+import com.chargebee.v4.services.ItemFamilyService;
 
-import com.chargebee.v4.core.services.SubscriptionEntitlementService;
+import com.chargebee.v4.services.SubscriptionEntitlementService;
 
-import com.chargebee.v4.core.services.ThirdPartyEntityMappingService;
+import com.chargebee.v4.services.ThirdPartyEntityMappingService;
 
-import com.chargebee.v4.core.services.EntitlementOverrideService;
+import com.chargebee.v4.services.EntitlementOverrideService;
 
-import com.chargebee.v4.core.services.ThirdPartyConfigurationService;
+import com.chargebee.v4.services.ThirdPartyConfigurationService;
 
-import com.chargebee.v4.core.services.UnbilledChargeService;
+import com.chargebee.v4.services.UnbilledChargeService;
 
-import com.chargebee.v4.core.services.CommentService;
+import com.chargebee.v4.services.CommentService;
 
-import com.chargebee.v4.core.services.InvoiceService;
+import com.chargebee.v4.services.InvoiceService;
 
-import com.chargebee.v4.core.services.TransactionService;
+import com.chargebee.v4.services.TransactionService;
 
-import com.chargebee.v4.core.services.ThirdPartySyncDetailService;
+import com.chargebee.v4.services.ThirdPartySyncDetailService;
 
-import com.chargebee.v4.core.services.CustomerService;
+import com.chargebee.v4.services.CustomerService;
 
-import com.chargebee.v4.core.services.ItemEntitlementService;
+import com.chargebee.v4.services.ItemEntitlementService;
 
 /**
  * Auto-generated interface defining all service access methods. ChargebeeClient implements this
@@ -173,565 +173,565 @@ public interface ClientMethods {
    *
    * @return GiftService instance for fluent API access
    */
-  GiftService gift();
+  GiftService gifts();
 
   /**
    * Access csv_tax_rule-related operations.
    *
    * @return CsvTaxRuleService instance for fluent API access
    */
-  CsvTaxRuleService csvTaxRule();
+  CsvTaxRuleService csvTaxRules();
 
   /**
    * Access usage-related operations.
    *
    * @return UsageService instance for fluent API access
    */
-  UsageService usage();
+  UsageService usages();
 
   /**
    * Access time_machine-related operations.
    *
    * @return TimeMachineService instance for fluent API access
    */
-  TimeMachineService timeMachine();
+  TimeMachineService timeMachines();
 
   /**
    * Access business_entity-related operations.
    *
    * @return BusinessEntityService instance for fluent API access
    */
-  BusinessEntityService businessEntity();
+  BusinessEntityService businessEntities();
 
   /**
    * Access offer_event-related operations.
    *
    * @return OfferEventService instance for fluent API access
    */
-  OfferEventService offerEvent();
+  OfferEventService offerEvents();
 
   /**
    * Access in_app_subscription-related operations.
    *
    * @return InAppSubscriptionService instance for fluent API access
    */
-  InAppSubscriptionService inAppSubscription();
+  InAppSubscriptionService inAppSubscriptions();
 
   /**
    * Access pc2_migration-related operations.
    *
    * @return Pc2MigrationService instance for fluent API access
    */
-  Pc2MigrationService pc2Migration();
+  Pc2MigrationService pc2Migrations();
 
   /**
    * Access credit_note-related operations.
    *
    * @return CreditNoteService instance for fluent API access
    */
-  CreditNoteService creditNote();
+  CreditNoteService creditNotes();
 
   /**
    * Access coupon_set-related operations.
    *
    * @return CouponSetService instance for fluent API access
    */
-  CouponSetService couponSet();
+  CouponSetService couponSets();
 
   /**
    * Access quote-related operations.
    *
    * @return QuoteService instance for fluent API access
    */
-  QuoteService quote();
+  QuoteService quotes();
 
   /**
    * Access pc2_migration_item-related operations.
    *
    * @return Pc2MigrationItemService instance for fluent API access
    */
-  Pc2MigrationItemService pc2MigrationItem();
+  Pc2MigrationItemService pc2MigrationItems();
 
   /**
    * Access estimate-related operations.
    *
    * @return EstimateService instance for fluent API access
    */
-  EstimateService estimate();
+  EstimateService estimates();
 
   /**
    * Access variant-related operations.
    *
    * @return VariantService instance for fluent API access
    */
-  VariantService variant();
+  VariantService variants();
 
   /**
    * Access pc2_migration_item_family-related operations.
    *
    * @return Pc2MigrationItemFamilyService instance for fluent API access
    */
-  Pc2MigrationItemFamilyService pc2MigrationItemFamily();
+  Pc2MigrationItemFamilyService pc2MigrationItemFamilies();
 
   /**
    * Access payment_source-related operations.
    *
    * @return PaymentSourceService instance for fluent API access
    */
-  PaymentSourceService paymentSource();
+  PaymentSourceService paymentSources();
 
   /**
    * Access recorded_purchase-related operations.
    *
    * @return RecordedPurchaseService instance for fluent API access
    */
-  RecordedPurchaseService recordedPurchase();
+  RecordedPurchaseService recordedPurchases();
 
   /**
    * Access plan-related operations.
    *
    * @return PlanService instance for fluent API access
    */
-  PlanService plan();
+  PlanService plans();
 
   /**
    * Access export-related operations.
    *
    * @return ExportService instance for fluent API access
    */
-  ExportService export();
+  ExportService exports();
 
   /**
    * Access order-related operations.
    *
    * @return OrderService instance for fluent API access
    */
-  OrderService order();
+  OrderService orders();
 
   /**
    * Access item-related operations.
    *
    * @return ItemService instance for fluent API access
    */
-  ItemService item();
+  ItemService items();
 
   /**
    * Access customer_entitlement-related operations.
    *
    * @return CustomerEntitlementService instance for fluent API access
    */
-  CustomerEntitlementService customerEntitlement();
+  CustomerEntitlementService customerEntitlements();
 
   /**
    * Access personalized_offer-related operations.
    *
    * @return PersonalizedOfferService instance for fluent API access
    */
-  PersonalizedOfferService personalizedOffer();
+  PersonalizedOfferService personalizedOffers();
 
   /**
    * Access omnichannel_subscription-related operations.
    *
    * @return OmnichannelSubscriptionService instance for fluent API access
    */
-  OmnichannelSubscriptionService omnichannelSubscription();
+  OmnichannelSubscriptionService omnichannelSubscriptions();
 
   /**
    * Access omnichannel_subscription_item-related operations.
    *
    * @return OmnichannelSubscriptionItemService instance for fluent API access
    */
-  OmnichannelSubscriptionItemService omnichannelSubscriptionItem();
+  OmnichannelSubscriptionItemService omnichannelSubscriptionItems();
 
   /**
    * Access ramp-related operations.
    *
    * @return RampService instance for fluent API access
    */
-  RampService ramp();
+  RampService ramps();
 
   /**
    * Access omnichannel_one_time_order-related operations.
    *
    * @return OmnichannelOneTimeOrderService instance for fluent API access
    */
-  OmnichannelOneTimeOrderService omnichannelOneTimeOrder();
+  OmnichannelOneTimeOrderService omnichannelOneTimeOrders();
 
   /**
    * Access differential_price-related operations.
    *
    * @return DifferentialPriceService instance for fluent API access
    */
-  DifferentialPriceService differentialPrice();
+  DifferentialPriceService differentialPrices();
 
   /**
    * Access entitlement-related operations.
    *
    * @return EntitlementService instance for fluent API access
    */
-  EntitlementService entitlement();
+  EntitlementService entitlements();
 
   /**
    * Access additional_billing_logiq-related operations.
    *
    * @return AdditionalBillingLogiqService instance for fluent API access
    */
-  AdditionalBillingLogiqService additionalBillingLogiq();
+  AdditionalBillingLogiqService additionalBillingLogiqs();
 
   /**
    * Access subscription_setting-related operations.
    *
    * @return SubscriptionSettingService instance for fluent API access
    */
-  SubscriptionSettingService subscriptionSetting();
+  SubscriptionSettingService subscriptionSettings();
 
   /**
    * Access site_migration_detail-related operations.
    *
    * @return SiteMigrationDetailService instance for fluent API access
    */
-  SiteMigrationDetailService siteMigrationDetail();
+  SiteMigrationDetailService siteMigrationDetails();
 
   /**
    * Access payment_intent-related operations.
    *
    * @return PaymentIntentService instance for fluent API access
    */
-  PaymentIntentService paymentIntent();
+  PaymentIntentService paymentIntents();
 
   /**
    * Access payment_schedule_scheme-related operations.
    *
    * @return PaymentScheduleSchemeService instance for fluent API access
    */
-  PaymentScheduleSchemeService paymentScheduleScheme();
+  PaymentScheduleSchemeService paymentScheduleSchemes();
 
   /**
    * Access card-related operations.
    *
    * @return CardService instance for fluent API access
    */
-  CardService card();
+  CardService cards();
 
   /**
    * Access attached_item-related operations.
    *
    * @return AttachedItemService instance for fluent API access
    */
-  AttachedItemService attachedItem();
+  AttachedItemService attachedItems();
 
   /**
    * Access usage_event-related operations.
    *
    * @return UsageEventService instance for fluent API access
    */
-  UsageEventService usageEvent();
+  UsageEventService usageEvents();
 
   /**
    * Access price_variant-related operations.
    *
    * @return PriceVariantService instance for fluent API access
    */
-  PriceVariantService priceVariant();
+  PriceVariantService priceVariants();
 
   /**
    * Access full_export-related operations.
    *
    * @return FullExportService instance for fluent API access
    */
-  FullExportService fullExport();
+  FullExportService fullExports();
 
   /**
    * Access virtual_bank_account-related operations.
    *
    * @return VirtualBankAccountService instance for fluent API access
    */
-  VirtualBankAccountService virtualBankAccount();
+  VirtualBankAccountService virtualBankAccounts();
 
   /**
    * Access addon-related operations.
    *
    * @return AddonService instance for fluent API access
    */
-  AddonService addon();
+  AddonService addons();
 
   /**
    * Access tp_site_user-related operations.
    *
    * @return TpSiteUserService instance for fluent API access
    */
-  TpSiteUserService tpSiteUser();
+  TpSiteUserService tpSiteUsers();
 
   /**
    * Access configuration-related operations.
    *
    * @return ConfigurationService instance for fluent API access
    */
-  ConfigurationService configuration();
+  ConfigurationService configurations();
 
   /**
    * Access pricing_page_session-related operations.
    *
    * @return PricingPageSessionService instance for fluent API access
    */
-  PricingPageSessionService pricingPageSession();
+  PricingPageSessionService pricingPageSessions();
 
   /**
    * Access pc2_migration_item_price-related operations.
    *
    * @return Pc2MigrationItemPriceService instance for fluent API access
    */
-  Pc2MigrationItemPriceService pc2MigrationItemPrice();
+  Pc2MigrationItemPriceService pc2MigrationItemPrices();
 
   /**
    * Access rule-related operations.
    *
    * @return RuleService instance for fluent API access
    */
-  RuleService rule();
+  RuleService rules();
 
   /**
    * Access subscription-related operations.
    *
    * @return SubscriptionService instance for fluent API access
    */
-  SubscriptionService subscription();
+  SubscriptionService subscriptions();
 
   /**
    * Access media-related operations.
    *
    * @return MediaService instance for fluent API access
    */
-  MediaService media();
+  MediaService medias();
 
   /**
    * Access business_profile-related operations.
    *
    * @return BusinessProfileService instance for fluent API access
    */
-  BusinessProfileService businessProfile();
+  BusinessProfileService businessProfiles();
 
   /**
    * Access promotional_credit-related operations.
    *
    * @return PromotionalCreditService instance for fluent API access
    */
-  PromotionalCreditService promotionalCredit();
+  PromotionalCreditService promotionalCredits();
 
   /**
    * Access brand_configuration-related operations.
    *
    * @return BrandConfigurationService instance for fluent API access
    */
-  BrandConfigurationService brandConfiguration();
+  BrandConfigurationService brandConfigurations();
 
   /**
    * Access webhook_endpoint-related operations.
    *
    * @return WebhookEndpointService instance for fluent API access
    */
-  WebhookEndpointService webhookEndpoint();
+  WebhookEndpointService webhookEndpoints();
 
   /**
    * Access feature-related operations.
    *
    * @return FeatureService instance for fluent API access
    */
-  FeatureService feature();
+  FeatureService features();
 
   /**
    * Access unbilled_charges_setting-related operations.
    *
    * @return UnbilledChargesSettingService instance for fluent API access
    */
-  UnbilledChargesSettingService unbilledChargesSetting();
+  UnbilledChargesSettingService unbilledChargesSettings();
 
   /**
    * Access currency-related operations.
    *
    * @return CurrencyService instance for fluent API access
    */
-  CurrencyService currency();
+  CurrencyService currencies();
 
   /**
    * Access event-related operations.
    *
    * @return EventService instance for fluent API access
    */
-  EventService event();
+  EventService events();
 
   /**
    * Access usage_file-related operations.
    *
    * @return UsageFileService instance for fluent API access
    */
-  UsageFileService usageFile();
+  UsageFileService usageFiles();
 
   /**
    * Access non_subscription-related operations.
    *
    * @return NonSubscriptionService instance for fluent API access
    */
-  NonSubscriptionService nonSubscription();
+  NonSubscriptionService nonSubscriptions();
 
   /**
    * Access resource_migration-related operations.
    *
    * @return ResourceMigrationService instance for fluent API access
    */
-  ResourceMigrationService resourceMigration();
+  ResourceMigrationService resourceMigrations();
 
   /**
    * Access product-related operations.
    *
    * @return ProductService instance for fluent API access
    */
-  ProductService product();
+  ProductService products();
 
   /**
    * Access coupon_code-related operations.
    *
    * @return CouponCodeService instance for fluent API access
    */
-  CouponCodeService couponCode();
+  CouponCodeService couponCodes();
 
   /**
    * Access address-related operations.
    *
    * @return AddressService instance for fluent API access
    */
-  AddressService address();
+  AddressService addresses();
 
   /**
    * Access coupon-related operations.
    *
    * @return CouponService instance for fluent API access
    */
-  CouponService coupon();
+  CouponService coupons();
 
   /**
    * Access portal_session-related operations.
    *
    * @return PortalSessionService instance for fluent API access
    */
-  PortalSessionService portalSession();
+  PortalSessionService portalSessions();
 
   /**
    * Access item_price-related operations.
    *
    * @return ItemPriceService instance for fluent API access
    */
-  ItemPriceService itemPrice();
+  ItemPriceService itemPrices();
 
   /**
    * Access offer_fulfillment-related operations.
    *
    * @return OfferFulfillmentService instance for fluent API access
    */
-  OfferFulfillmentService offerFulfillment();
+  OfferFulfillmentService offerFulfillments();
 
   /**
    * Access hosted_page-related operations.
    *
    * @return HostedPageService instance for fluent API access
    */
-  HostedPageService hostedPage();
+  HostedPageService hostedPages();
 
   /**
    * Access purchase-related operations.
    *
    * @return PurchaseService instance for fluent API access
    */
-  PurchaseService purchase();
+  PurchaseService purchases();
 
   /**
    * Access payment_voucher-related operations.
    *
    * @return PaymentVoucherService instance for fluent API access
    */
-  PaymentVoucherService paymentVoucher();
+  PaymentVoucherService paymentVouchers();
 
   /**
    * Access item_family-related operations.
    *
    * @return ItemFamilyService instance for fluent API access
    */
-  ItemFamilyService itemFamily();
+  ItemFamilyService itemFamilies();
 
   /**
    * Access subscription_entitlement-related operations.
    *
    * @return SubscriptionEntitlementService instance for fluent API access
    */
-  SubscriptionEntitlementService subscriptionEntitlement();
+  SubscriptionEntitlementService subscriptionEntitlements();
 
   /**
    * Access third_party_entity_mapping-related operations.
    *
    * @return ThirdPartyEntityMappingService instance for fluent API access
    */
-  ThirdPartyEntityMappingService thirdPartyEntityMapping();
+  ThirdPartyEntityMappingService thirdPartyEntityMappings();
 
   /**
    * Access entitlement_override-related operations.
    *
    * @return EntitlementOverrideService instance for fluent API access
    */
-  EntitlementOverrideService entitlementOverride();
+  EntitlementOverrideService entitlementOverrides();
 
   /**
    * Access third_party_configuration-related operations.
    *
    * @return ThirdPartyConfigurationService instance for fluent API access
    */
-  ThirdPartyConfigurationService thirdPartyConfiguration();
+  ThirdPartyConfigurationService thirdPartyConfigurations();
 
   /**
    * Access unbilled_charge-related operations.
    *
    * @return UnbilledChargeService instance for fluent API access
    */
-  UnbilledChargeService unbilledCharge();
+  UnbilledChargeService unbilledCharges();
 
   /**
    * Access comment-related operations.
    *
    * @return CommentService instance for fluent API access
    */
-  CommentService comment();
+  CommentService comments();
 
   /**
    * Access invoice-related operations.
    *
    * @return InvoiceService instance for fluent API access
    */
-  InvoiceService invoice();
+  InvoiceService invoices();
 
   /**
    * Access transaction-related operations.
    *
    * @return TransactionService instance for fluent API access
    */
-  TransactionService transaction();
+  TransactionService transactions();
 
   /**
    * Access third_party_sync_detail-related operations.
    *
    * @return ThirdPartySyncDetailService instance for fluent API access
    */
-  ThirdPartySyncDetailService thirdPartySyncDetail();
+  ThirdPartySyncDetailService thirdPartySyncDetails();
 
   /**
    * Access customer-related operations.
    *
    * @return CustomerService instance for fluent API access
    */
-  CustomerService customer();
+  CustomerService customers();
 
   /**
    * Access item_entitlement-related operations.
    *
    * @return ItemEntitlementService instance for fluent API access
    */
-  ItemEntitlementService itemEntitlement();
+  ItemEntitlementService itemEntitlements();
 }
diff --git a/src/main/java/com/chargebee/v4/client/ClientMethodsImpl.java b/src/main/java/com/chargebee/v4/client/ClientMethodsImpl.java
index a669c34e..5aed49b1 100644
--- a/src/main/java/com/chargebee/v4/client/ClientMethodsImpl.java
+++ b/src/main/java/com/chargebee/v4/client/ClientMethodsImpl.java
@@ -1,166 +1,166 @@
 package com.chargebee.v4.client;
 
-import com.chargebee.v4.core.services.GiftService;
+import com.chargebee.v4.services.GiftService;
 
-import com.chargebee.v4.core.services.CsvTaxRuleService;
+import com.chargebee.v4.services.CsvTaxRuleService;
 
-import com.chargebee.v4.core.services.UsageService;
+import com.chargebee.v4.services.UsageService;
 
-import com.chargebee.v4.core.services.TimeMachineService;
+import com.chargebee.v4.services.TimeMachineService;
 
-import com.chargebee.v4.core.services.BusinessEntityService;
+import com.chargebee.v4.services.BusinessEntityService;
 
-import com.chargebee.v4.core.services.OfferEventService;
+import com.chargebee.v4.services.OfferEventService;
 
-import com.chargebee.v4.core.services.InAppSubscriptionService;
+import com.chargebee.v4.services.InAppSubscriptionService;
 
-import com.chargebee.v4.core.services.Pc2MigrationService;
+import com.chargebee.v4.services.Pc2MigrationService;
 
-import com.chargebee.v4.core.services.CreditNoteService;
+import com.chargebee.v4.services.CreditNoteService;
 
-import com.chargebee.v4.core.services.CouponSetService;
+import com.chargebee.v4.services.CouponSetService;
 
-import com.chargebee.v4.core.services.QuoteService;
+import com.chargebee.v4.services.QuoteService;
 
-import com.chargebee.v4.core.services.Pc2MigrationItemService;
+import com.chargebee.v4.services.Pc2MigrationItemService;
 
-import com.chargebee.v4.core.services.EstimateService;
+import com.chargebee.v4.services.EstimateService;
 
-import com.chargebee.v4.core.services.VariantService;
+import com.chargebee.v4.services.VariantService;
 
-import com.chargebee.v4.core.services.Pc2MigrationItemFamilyService;
+import com.chargebee.v4.services.Pc2MigrationItemFamilyService;
 
-import com.chargebee.v4.core.services.PaymentSourceService;
+import com.chargebee.v4.services.PaymentSourceService;
 
-import com.chargebee.v4.core.services.RecordedPurchaseService;
+import com.chargebee.v4.services.RecordedPurchaseService;
 
-import com.chargebee.v4.core.services.PlanService;
+import com.chargebee.v4.services.PlanService;
 
-import com.chargebee.v4.core.services.ExportService;
+import com.chargebee.v4.services.ExportService;
 
-import com.chargebee.v4.core.services.OrderService;
+import com.chargebee.v4.services.OrderService;
 
-import com.chargebee.v4.core.services.ItemService;
+import com.chargebee.v4.services.ItemService;
 
-import com.chargebee.v4.core.services.CustomerEntitlementService;
+import com.chargebee.v4.services.CustomerEntitlementService;
 
-import com.chargebee.v4.core.services.PersonalizedOfferService;
+import com.chargebee.v4.services.PersonalizedOfferService;
 
-import com.chargebee.v4.core.services.OmnichannelSubscriptionService;
+import com.chargebee.v4.services.OmnichannelSubscriptionService;
 
-import com.chargebee.v4.core.services.OmnichannelSubscriptionItemService;
+import com.chargebee.v4.services.OmnichannelSubscriptionItemService;
 
-import com.chargebee.v4.core.services.RampService;
+import com.chargebee.v4.services.RampService;
 
-import com.chargebee.v4.core.services.OmnichannelOneTimeOrderService;
+import com.chargebee.v4.services.OmnichannelOneTimeOrderService;
 
-import com.chargebee.v4.core.services.DifferentialPriceService;
+import com.chargebee.v4.services.DifferentialPriceService;
 
-import com.chargebee.v4.core.services.EntitlementService;
+import com.chargebee.v4.services.EntitlementService;
 
-import com.chargebee.v4.core.services.AdditionalBillingLogiqService;
+import com.chargebee.v4.services.AdditionalBillingLogiqService;
 
-import com.chargebee.v4.core.services.SubscriptionSettingService;
+import com.chargebee.v4.services.SubscriptionSettingService;
 
-import com.chargebee.v4.core.services.SiteMigrationDetailService;
+import com.chargebee.v4.services.SiteMigrationDetailService;
 
-import com.chargebee.v4.core.services.PaymentIntentService;
+import com.chargebee.v4.services.PaymentIntentService;
 
-import com.chargebee.v4.core.services.PaymentScheduleSchemeService;
+import com.chargebee.v4.services.PaymentScheduleSchemeService;
 
-import com.chargebee.v4.core.services.CardService;
+import com.chargebee.v4.services.CardService;
 
-import com.chargebee.v4.core.services.AttachedItemService;
+import com.chargebee.v4.services.AttachedItemService;
 
-import com.chargebee.v4.core.services.UsageEventService;
+import com.chargebee.v4.services.UsageEventService;
 
-import com.chargebee.v4.core.services.PriceVariantService;
+import com.chargebee.v4.services.PriceVariantService;
 
-import com.chargebee.v4.core.services.FullExportService;
+import com.chargebee.v4.services.FullExportService;
 
-import com.chargebee.v4.core.services.VirtualBankAccountService;
+import com.chargebee.v4.services.VirtualBankAccountService;
 
-import com.chargebee.v4.core.services.AddonService;
+import com.chargebee.v4.services.AddonService;
 
-import com.chargebee.v4.core.services.TpSiteUserService;
+import com.chargebee.v4.services.TpSiteUserService;
 
-import com.chargebee.v4.core.services.ConfigurationService;
+import com.chargebee.v4.services.ConfigurationService;
 
-import com.chargebee.v4.core.services.PricingPageSessionService;
+import com.chargebee.v4.services.PricingPageSessionService;
 
-import com.chargebee.v4.core.services.Pc2MigrationItemPriceService;
+import com.chargebee.v4.services.Pc2MigrationItemPriceService;
 
-import com.chargebee.v4.core.services.RuleService;
+import com.chargebee.v4.services.RuleService;
 
-import com.chargebee.v4.core.services.SubscriptionService;
+import com.chargebee.v4.services.SubscriptionService;
 
-import com.chargebee.v4.core.services.MediaService;
+import com.chargebee.v4.services.MediaService;
 
-import com.chargebee.v4.core.services.BusinessProfileService;
+import com.chargebee.v4.services.BusinessProfileService;
 
-import com.chargebee.v4.core.services.PromotionalCreditService;
+import com.chargebee.v4.services.PromotionalCreditService;
 
-import com.chargebee.v4.core.services.BrandConfigurationService;
+import com.chargebee.v4.services.BrandConfigurationService;
 
-import com.chargebee.v4.core.services.WebhookEndpointService;
+import com.chargebee.v4.services.WebhookEndpointService;
 
-import com.chargebee.v4.core.services.FeatureService;
+import com.chargebee.v4.services.FeatureService;
 
-import com.chargebee.v4.core.services.UnbilledChargesSettingService;
+import com.chargebee.v4.services.UnbilledChargesSettingService;
 
-import com.chargebee.v4.core.services.CurrencyService;
+import com.chargebee.v4.services.CurrencyService;
 
-import com.chargebee.v4.core.services.EventService;
+import com.chargebee.v4.services.EventService;
 
-import com.chargebee.v4.core.services.UsageFileService;
+import com.chargebee.v4.services.UsageFileService;
 
-import com.chargebee.v4.core.services.NonSubscriptionService;
+import com.chargebee.v4.services.NonSubscriptionService;
 
-import com.chargebee.v4.core.services.ResourceMigrationService;
+import com.chargebee.v4.services.ResourceMigrationService;
 
-import com.chargebee.v4.core.services.ProductService;
+import com.chargebee.v4.services.ProductService;
 
-import com.chargebee.v4.core.services.CouponCodeService;
+import com.chargebee.v4.services.CouponCodeService;
 
-import com.chargebee.v4.core.services.AddressService;
+import com.chargebee.v4.services.AddressService;
 
-import com.chargebee.v4.core.services.CouponService;
+import com.chargebee.v4.services.CouponService;
 
-import com.chargebee.v4.core.services.PortalSessionService;
+import com.chargebee.v4.services.PortalSessionService;
 
-import com.chargebee.v4.core.services.ItemPriceService;
+import com.chargebee.v4.services.ItemPriceService;
 
-import com.chargebee.v4.core.services.OfferFulfillmentService;
+import com.chargebee.v4.services.OfferFulfillmentService;
 
-import com.chargebee.v4.core.services.HostedPageService;
+import com.chargebee.v4.services.HostedPageService;
 
-import com.chargebee.v4.core.services.PurchaseService;
+import com.chargebee.v4.services.PurchaseService;
 
-import com.chargebee.v4.core.services.PaymentVoucherService;
+import com.chargebee.v4.services.PaymentVoucherService;
 
-import com.chargebee.v4.core.services.ItemFamilyService;
+import com.chargebee.v4.services.ItemFamilyService;
 
-import com.chargebee.v4.core.services.SubscriptionEntitlementService;
+import com.chargebee.v4.services.SubscriptionEntitlementService;
 
-import com.chargebee.v4.core.services.ThirdPartyEntityMappingService;
+import com.chargebee.v4.services.ThirdPartyEntityMappingService;
 
-import com.chargebee.v4.core.services.EntitlementOverrideService;
+import com.chargebee.v4.services.EntitlementOverrideService;
 
-import com.chargebee.v4.core.services.ThirdPartyConfigurationService;
+import com.chargebee.v4.services.ThirdPartyConfigurationService;
 
-import com.chargebee.v4.core.services.UnbilledChargeService;
+import com.chargebee.v4.services.UnbilledChargeService;
 
-import com.chargebee.v4.core.services.CommentService;
+import com.chargebee.v4.services.CommentService;
 
-import com.chargebee.v4.core.services.InvoiceService;
+import com.chargebee.v4.services.InvoiceService;
 
-import com.chargebee.v4.core.services.TransactionService;
+import com.chargebee.v4.services.TransactionService;
 
-import com.chargebee.v4.core.services.ThirdPartySyncDetailService;
+import com.chargebee.v4.services.ThirdPartySyncDetailService;
 
-import com.chargebee.v4.core.services.CustomerService;
+import com.chargebee.v4.services.CustomerService;
 
-import com.chargebee.v4.core.services.ItemEntitlementService;
+import com.chargebee.v4.services.ItemEntitlementService;
 
 /**
  * Auto-generated implementation of ClientMethods interface. This class provides the actual service
@@ -171,407 +171,407 @@ abstract class ClientMethodsImpl implements ClientMethods {
   protected abstract ServiceRegistry getServiceRegistry();
 
   @Override
-  public GiftService gift() {
-    return getServiceRegistry().gift();
+  public GiftService gifts() {
+    return getServiceRegistry().gifts();
   }
 
   @Override
-  public CsvTaxRuleService csvTaxRule() {
-    return getServiceRegistry().csvTaxRule();
+  public CsvTaxRuleService csvTaxRules() {
+    return getServiceRegistry().csvTaxRules();
   }
 
   @Override
-  public UsageService usage() {
-    return getServiceRegistry().usage();
+  public UsageService usages() {
+    return getServiceRegistry().usages();
   }
 
   @Override
-  public TimeMachineService timeMachine() {
-    return getServiceRegistry().timeMachine();
+  public TimeMachineService timeMachines() {
+    return getServiceRegistry().timeMachines();
   }
 
   @Override
-  public BusinessEntityService businessEntity() {
-    return getServiceRegistry().businessEntity();
+  public BusinessEntityService businessEntities() {
+    return getServiceRegistry().businessEntities();
   }
 
   @Override
-  public OfferEventService offerEvent() {
-    return getServiceRegistry().offerEvent();
+  public OfferEventService offerEvents() {
+    return getServiceRegistry().offerEvents();
   }
 
   @Override
-  public InAppSubscriptionService inAppSubscription() {
-    return getServiceRegistry().inAppSubscription();
+  public InAppSubscriptionService inAppSubscriptions() {
+    return getServiceRegistry().inAppSubscriptions();
   }
 
   @Override
-  public Pc2MigrationService pc2Migration() {
-    return getServiceRegistry().pc2Migration();
+  public Pc2MigrationService pc2Migrations() {
+    return getServiceRegistry().pc2Migrations();
   }
 
   @Override
-  public CreditNoteService creditNote() {
-    return getServiceRegistry().creditNote();
+  public CreditNoteService creditNotes() {
+    return getServiceRegistry().creditNotes();
   }
 
   @Override
-  public CouponSetService couponSet() {
-    return getServiceRegistry().couponSet();
+  public CouponSetService couponSets() {
+    return getServiceRegistry().couponSets();
   }
 
   @Override
-  public QuoteService quote() {
-    return getServiceRegistry().quote();
+  public QuoteService quotes() {
+    return getServiceRegistry().quotes();
   }
 
   @Override
-  public Pc2MigrationItemService pc2MigrationItem() {
-    return getServiceRegistry().pc2MigrationItem();
+  public Pc2MigrationItemService pc2MigrationItems() {
+    return getServiceRegistry().pc2MigrationItems();
   }
 
   @Override
-  public EstimateService estimate() {
-    return getServiceRegistry().estimate();
+  public EstimateService estimates() {
+    return getServiceRegistry().estimates();
   }
 
   @Override
-  public VariantService variant() {
-    return getServiceRegistry().variant();
+  public VariantService variants() {
+    return getServiceRegistry().variants();
   }
 
   @Override
-  public Pc2MigrationItemFamilyService pc2MigrationItemFamily() {
-    return getServiceRegistry().pc2MigrationItemFamily();
+  public Pc2MigrationItemFamilyService pc2MigrationItemFamilies() {
+    return getServiceRegistry().pc2MigrationItemFamilies();
   }
 
   @Override
-  public PaymentSourceService paymentSource() {
-    return getServiceRegistry().paymentSource();
+  public PaymentSourceService paymentSources() {
+    return getServiceRegistry().paymentSources();
   }
 
   @Override
-  public RecordedPurchaseService recordedPurchase() {
-    return getServiceRegistry().recordedPurchase();
+  public RecordedPurchaseService recordedPurchases() {
+    return getServiceRegistry().recordedPurchases();
   }
 
   @Override
-  public PlanService plan() {
-    return getServiceRegistry().plan();
+  public PlanService plans() {
+    return getServiceRegistry().plans();
   }
 
   @Override
-  public ExportService export() {
-    return getServiceRegistry().export();
+  public ExportService exports() {
+    return getServiceRegistry().exports();
   }
 
   @Override
-  public OrderService order() {
-    return getServiceRegistry().order();
+  public OrderService orders() {
+    return getServiceRegistry().orders();
   }
 
   @Override
-  public ItemService item() {
-    return getServiceRegistry().item();
+  public ItemService items() {
+    return getServiceRegistry().items();
   }
 
   @Override
-  public CustomerEntitlementService customerEntitlement() {
-    return getServiceRegistry().customerEntitlement();
+  public CustomerEntitlementService customerEntitlements() {
+    return getServiceRegistry().customerEntitlements();
   }
 
   @Override
-  public PersonalizedOfferService personalizedOffer() {
-    return getServiceRegistry().personalizedOffer();
+  public PersonalizedOfferService personalizedOffers() {
+    return getServiceRegistry().personalizedOffers();
   }
 
   @Override
-  public OmnichannelSubscriptionService omnichannelSubscription() {
-    return getServiceRegistry().omnichannelSubscription();
+  public OmnichannelSubscriptionService omnichannelSubscriptions() {
+    return getServiceRegistry().omnichannelSubscriptions();
   }
 
   @Override
-  public OmnichannelSubscriptionItemService omnichannelSubscriptionItem() {
-    return getServiceRegistry().omnichannelSubscriptionItem();
+  public OmnichannelSubscriptionItemService omnichannelSubscriptionItems() {
+    return getServiceRegistry().omnichannelSubscriptionItems();
   }
 
   @Override
-  public RampService ramp() {
-    return getServiceRegistry().ramp();
+  public RampService ramps() {
+    return getServiceRegistry().ramps();
   }
 
   @Override
-  public OmnichannelOneTimeOrderService omnichannelOneTimeOrder() {
-    return getServiceRegistry().omnichannelOneTimeOrder();
+  public OmnichannelOneTimeOrderService omnichannelOneTimeOrders() {
+    return getServiceRegistry().omnichannelOneTimeOrders();
   }
 
   @Override
-  public DifferentialPriceService differentialPrice() {
-    return getServiceRegistry().differentialPrice();
+  public DifferentialPriceService differentialPrices() {
+    return getServiceRegistry().differentialPrices();
   }
 
   @Override
-  public EntitlementService entitlement() {
-    return getServiceRegistry().entitlement();
+  public EntitlementService entitlements() {
+    return getServiceRegistry().entitlements();
   }
 
   @Override
-  public AdditionalBillingLogiqService additionalBillingLogiq() {
-    return getServiceRegistry().additionalBillingLogiq();
+  public AdditionalBillingLogiqService additionalBillingLogiqs() {
+    return getServiceRegistry().additionalBillingLogiqs();
   }
 
   @Override
-  public SubscriptionSettingService subscriptionSetting() {
-    return getServiceRegistry().subscriptionSetting();
+  public SubscriptionSettingService subscriptionSettings() {
+    return getServiceRegistry().subscriptionSettings();
   }
 
   @Override
-  public SiteMigrationDetailService siteMigrationDetail() {
-    return getServiceRegistry().siteMigrationDetail();
+  public SiteMigrationDetailService siteMigrationDetails() {
+    return getServiceRegistry().siteMigrationDetails();
   }
 
   @Override
-  public PaymentIntentService paymentIntent() {
-    return getServiceRegistry().paymentIntent();
+  public PaymentIntentService paymentIntents() {
+    return getServiceRegistry().paymentIntents();
   }
 
   @Override
-  public PaymentScheduleSchemeService paymentScheduleScheme() {
-    return getServiceRegistry().paymentScheduleScheme();
+  public PaymentScheduleSchemeService paymentScheduleSchemes() {
+    return getServiceRegistry().paymentScheduleSchemes();
   }
 
   @Override
-  public CardService card() {
-    return getServiceRegistry().card();
+  public CardService cards() {
+    return getServiceRegistry().cards();
   }
 
   @Override
-  public AttachedItemService attachedItem() {
-    return getServiceRegistry().attachedItem();
+  public AttachedItemService attachedItems() {
+    return getServiceRegistry().attachedItems();
   }
 
   @Override
-  public UsageEventService usageEvent() {
-    return getServiceRegistry().usageEvent();
+  public UsageEventService usageEvents() {
+    return getServiceRegistry().usageEvents();
   }
 
   @Override
-  public PriceVariantService priceVariant() {
-    return getServiceRegistry().priceVariant();
+  public PriceVariantService priceVariants() {
+    return getServiceRegistry().priceVariants();
   }
 
   @Override
-  public FullExportService fullExport() {
-    return getServiceRegistry().fullExport();
+  public FullExportService fullExports() {
+    return getServiceRegistry().fullExports();
   }
 
   @Override
-  public VirtualBankAccountService virtualBankAccount() {
-    return getServiceRegistry().virtualBankAccount();
+  public VirtualBankAccountService virtualBankAccounts() {
+    return getServiceRegistry().virtualBankAccounts();
   }
 
   @Override
-  public AddonService addon() {
-    return getServiceRegistry().addon();
+  public AddonService addons() {
+    return getServiceRegistry().addons();
   }
 
   @Override
-  public TpSiteUserService tpSiteUser() {
-    return getServiceRegistry().tpSiteUser();
+  public TpSiteUserService tpSiteUsers() {
+    return getServiceRegistry().tpSiteUsers();
   }
 
   @Override
-  public ConfigurationService configuration() {
-    return getServiceRegistry().configuration();
+  public ConfigurationService configurations() {
+    return getServiceRegistry().configurations();
   }
 
   @Override
-  public PricingPageSessionService pricingPageSession() {
-    return getServiceRegistry().pricingPageSession();
+  public PricingPageSessionService pricingPageSessions() {
+    return getServiceRegistry().pricingPageSessions();
   }
 
   @Override
-  public Pc2MigrationItemPriceService pc2MigrationItemPrice() {
-    return getServiceRegistry().pc2MigrationItemPrice();
+  public Pc2MigrationItemPriceService pc2MigrationItemPrices() {
+    return getServiceRegistry().pc2MigrationItemPrices();
   }
 
   @Override
-  public RuleService rule() {
-    return getServiceRegistry().rule();
+  public RuleService rules() {
+    return getServiceRegistry().rules();
   }
 
   @Override
-  public SubscriptionService subscription() {
-    return getServiceRegistry().subscription();
+  public SubscriptionService subscriptions() {
+    return getServiceRegistry().subscriptions();
   }
 
   @Override
-  public MediaService media() {
-    return getServiceRegistry().media();
+  public MediaService medias() {
+    return getServiceRegistry().medias();
   }
 
   @Override
-  public BusinessProfileService businessProfile() {
-    return getServiceRegistry().businessProfile();
+  public BusinessProfileService businessProfiles() {
+    return getServiceRegistry().businessProfiles();
   }
 
   @Override
-  public PromotionalCreditService promotionalCredit() {
-    return getServiceRegistry().promotionalCredit();
+  public PromotionalCreditService promotionalCredits() {
+    return getServiceRegistry().promotionalCredits();
   }
 
   @Override
-  public BrandConfigurationService brandConfiguration() {
-    return getServiceRegistry().brandConfiguration();
+  public BrandConfigurationService brandConfigurations() {
+    return getServiceRegistry().brandConfigurations();
   }
 
   @Override
-  public WebhookEndpointService webhookEndpoint() {
-    return getServiceRegistry().webhookEndpoint();
+  public WebhookEndpointService webhookEndpoints() {
+    return getServiceRegistry().webhookEndpoints();
   }
 
   @Override
-  public FeatureService feature() {
-    return getServiceRegistry().feature();
+  public FeatureService features() {
+    return getServiceRegistry().features();
   }
 
   @Override
-  public UnbilledChargesSettingService unbilledChargesSetting() {
-    return getServiceRegistry().unbilledChargesSetting();
+  public UnbilledChargesSettingService unbilledChargesSettings() {
+    return getServiceRegistry().unbilledChargesSettings();
   }
 
   @Override
-  public CurrencyService currency() {
-    return getServiceRegistry().currency();
+  public CurrencyService currencies() {
+    return getServiceRegistry().currencies();
   }
 
   @Override
-  public EventService event() {
-    return getServiceRegistry().event();
+  public EventService events() {
+    return getServiceRegistry().events();
   }
 
   @Override
-  public UsageFileService usageFile() {
-    return getServiceRegistry().usageFile();
+  public UsageFileService usageFiles() {
+    return getServiceRegistry().usageFiles();
   }
 
   @Override
-  public NonSubscriptionService nonSubscription() {
-    return getServiceRegistry().nonSubscription();
+  public NonSubscriptionService nonSubscriptions() {
+    return getServiceRegistry().nonSubscriptions();
   }
 
   @Override
-  public ResourceMigrationService resourceMigration() {
-    return getServiceRegistry().resourceMigration();
+  public ResourceMigrationService resourceMigrations() {
+    return getServiceRegistry().resourceMigrations();
   }
 
   @Override
-  public ProductService product() {
-    return getServiceRegistry().product();
+  public ProductService products() {
+    return getServiceRegistry().products();
   }
 
   @Override
-  public CouponCodeService couponCode() {
-    return getServiceRegistry().couponCode();
+  public CouponCodeService couponCodes() {
+    return getServiceRegistry().couponCodes();
   }
 
   @Override
-  public AddressService address() {
-    return getServiceRegistry().address();
+  public AddressService addresses() {
+    return getServiceRegistry().addresses();
   }
 
   @Override
-  public CouponService coupon() {
-    return getServiceRegistry().coupon();
+  public CouponService coupons() {
+    return getServiceRegistry().coupons();
   }
 
   @Override
-  public PortalSessionService portalSession() {
-    return getServiceRegistry().portalSession();
+  public PortalSessionService portalSessions() {
+    return getServiceRegistry().portalSessions();
   }
 
   @Override
-  public ItemPriceService itemPrice() {
-    return getServiceRegistry().itemPrice();
+  public ItemPriceService itemPrices() {
+    return getServiceRegistry().itemPrices();
   }
 
   @Override
-  public OfferFulfillmentService offerFulfillment() {
-    return getServiceRegistry().offerFulfillment();
+  public OfferFulfillmentService offerFulfillments() {
+    return getServiceRegistry().offerFulfillments();
   }
 
   @Override
-  public HostedPageService hostedPage() {
-    return getServiceRegistry().hostedPage();
+  public HostedPageService hostedPages() {
+    return getServiceRegistry().hostedPages();
   }
 
   @Override
-  public PurchaseService purchase() {
-    return getServiceRegistry().purchase();
+  public PurchaseService purchases() {
+    return getServiceRegistry().purchases();
   }
 
   @Override
-  public PaymentVoucherService paymentVoucher() {
-    return getServiceRegistry().paymentVoucher();
+  public PaymentVoucherService paymentVouchers() {
+    return getServiceRegistry().paymentVouchers();
   }
 
   @Override
-  public ItemFamilyService itemFamily() {
-    return getServiceRegistry().itemFamily();
+  public ItemFamilyService itemFamilies() {
+    return getServiceRegistry().itemFamilies();
   }
 
   @Override
-  public SubscriptionEntitlementService subscriptionEntitlement() {
-    return getServiceRegistry().subscriptionEntitlement();
+  public SubscriptionEntitlementService subscriptionEntitlements() {
+    return getServiceRegistry().subscriptionEntitlements();
   }
 
   @Override
-  public ThirdPartyEntityMappingService thirdPartyEntityMapping() {
-    return getServiceRegistry().thirdPartyEntityMapping();
+  public ThirdPartyEntityMappingService thirdPartyEntityMappings() {
+    return getServiceRegistry().thirdPartyEntityMappings();
   }
 
   @Override
-  public EntitlementOverrideService entitlementOverride() {
-    return getServiceRegistry().entitlementOverride();
+  public EntitlementOverrideService entitlementOverrides() {
+    return getServiceRegistry().entitlementOverrides();
   }
 
   @Override
-  public ThirdPartyConfigurationService thirdPartyConfiguration() {
-    return getServiceRegistry().thirdPartyConfiguration();
+  public ThirdPartyConfigurationService thirdPartyConfigurations() {
+    return getServiceRegistry().thirdPartyConfigurations();
   }
 
   @Override
-  public UnbilledChargeService unbilledCharge() {
-    return getServiceRegistry().unbilledCharge();
+  public UnbilledChargeService unbilledCharges() {
+    return getServiceRegistry().unbilledCharges();
   }
 
   @Override
-  public CommentService comment() {
-    return getServiceRegistry().comment();
+  public CommentService comments() {
+    return getServiceRegistry().comments();
   }
 
   @Override
-  public InvoiceService invoice() {
-    return getServiceRegistry().invoice();
+  public InvoiceService invoices() {
+    return getServiceRegistry().invoices();
   }
 
   @Override
-  public TransactionService transaction() {
-    return getServiceRegistry().transaction();
+  public TransactionService transactions() {
+    return getServiceRegistry().transactions();
   }
 
   @Override
-  public ThirdPartySyncDetailService thirdPartySyncDetail() {
-    return getServiceRegistry().thirdPartySyncDetail();
+  public ThirdPartySyncDetailService thirdPartySyncDetails() {
+    return getServiceRegistry().thirdPartySyncDetails();
   }
 
   @Override
-  public CustomerService customer() {
-    return getServiceRegistry().customer();
+  public CustomerService customers() {
+    return getServiceRegistry().customers();
   }
 
   @Override
-  public ItemEntitlementService itemEntitlement() {
-    return getServiceRegistry().itemEntitlement();
+  public ItemEntitlementService itemEntitlements() {
+    return getServiceRegistry().itemEntitlements();
   }
 }
diff --git a/src/main/java/com/chargebee/v4/client/ServiceRegistry.java b/src/main/java/com/chargebee/v4/client/ServiceRegistry.java
index 28d1978d..7938b35d 100644
--- a/src/main/java/com/chargebee/v4/client/ServiceRegistry.java
+++ b/src/main/java/com/chargebee/v4/client/ServiceRegistry.java
@@ -1,166 +1,166 @@
 package com.chargebee.v4.client;
 
-import com.chargebee.v4.core.services.GiftService;
+import com.chargebee.v4.services.GiftService;
 
-import com.chargebee.v4.core.services.CsvTaxRuleService;
+import com.chargebee.v4.services.CsvTaxRuleService;
 
-import com.chargebee.v4.core.services.UsageService;
+import com.chargebee.v4.services.UsageService;
 
-import com.chargebee.v4.core.services.TimeMachineService;
+import com.chargebee.v4.services.TimeMachineService;
 
-import com.chargebee.v4.core.services.BusinessEntityService;
+import com.chargebee.v4.services.BusinessEntityService;
 
-import com.chargebee.v4.core.services.OfferEventService;
+import com.chargebee.v4.services.OfferEventService;
 
-import com.chargebee.v4.core.services.InAppSubscriptionService;
+import com.chargebee.v4.services.InAppSubscriptionService;
 
-import com.chargebee.v4.core.services.Pc2MigrationService;
+import com.chargebee.v4.services.Pc2MigrationService;
 
-import com.chargebee.v4.core.services.CreditNoteService;
+import com.chargebee.v4.services.CreditNoteService;
 
-import com.chargebee.v4.core.services.CouponSetService;
+import com.chargebee.v4.services.CouponSetService;
 
-import com.chargebee.v4.core.services.QuoteService;
+import com.chargebee.v4.services.QuoteService;
 
-import com.chargebee.v4.core.services.Pc2MigrationItemService;
+import com.chargebee.v4.services.Pc2MigrationItemService;
 
-import com.chargebee.v4.core.services.EstimateService;
+import com.chargebee.v4.services.EstimateService;
 
-import com.chargebee.v4.core.services.VariantService;
+import com.chargebee.v4.services.VariantService;
 
-import com.chargebee.v4.core.services.Pc2MigrationItemFamilyService;
+import com.chargebee.v4.services.Pc2MigrationItemFamilyService;
 
-import com.chargebee.v4.core.services.PaymentSourceService;
+import com.chargebee.v4.services.PaymentSourceService;
 
-import com.chargebee.v4.core.services.RecordedPurchaseService;
+import com.chargebee.v4.services.RecordedPurchaseService;
 
-import com.chargebee.v4.core.services.PlanService;
+import com.chargebee.v4.services.PlanService;
 
-import com.chargebee.v4.core.services.ExportService;
+import com.chargebee.v4.services.ExportService;
 
-import com.chargebee.v4.core.services.OrderService;
+import com.chargebee.v4.services.OrderService;
 
-import com.chargebee.v4.core.services.ItemService;
+import com.chargebee.v4.services.ItemService;
 
-import com.chargebee.v4.core.services.CustomerEntitlementService;
+import com.chargebee.v4.services.CustomerEntitlementService;
 
-import com.chargebee.v4.core.services.PersonalizedOfferService;
+import com.chargebee.v4.services.PersonalizedOfferService;
 
-import com.chargebee.v4.core.services.OmnichannelSubscriptionService;
+import com.chargebee.v4.services.OmnichannelSubscriptionService;
 
-import com.chargebee.v4.core.services.OmnichannelSubscriptionItemService;
+import com.chargebee.v4.services.OmnichannelSubscriptionItemService;
 
-import com.chargebee.v4.core.services.RampService;
+import com.chargebee.v4.services.RampService;
 
-import com.chargebee.v4.core.services.OmnichannelOneTimeOrderService;
+import com.chargebee.v4.services.OmnichannelOneTimeOrderService;
 
-import com.chargebee.v4.core.services.DifferentialPriceService;
+import com.chargebee.v4.services.DifferentialPriceService;
 
-import com.chargebee.v4.core.services.EntitlementService;
+import com.chargebee.v4.services.EntitlementService;
 
-import com.chargebee.v4.core.services.AdditionalBillingLogiqService;
+import com.chargebee.v4.services.AdditionalBillingLogiqService;
 
-import com.chargebee.v4.core.services.SubscriptionSettingService;
+import com.chargebee.v4.services.SubscriptionSettingService;
 
-import com.chargebee.v4.core.services.SiteMigrationDetailService;
+import com.chargebee.v4.services.SiteMigrationDetailService;
 
-import com.chargebee.v4.core.services.PaymentIntentService;
+import com.chargebee.v4.services.PaymentIntentService;
 
-import com.chargebee.v4.core.services.PaymentScheduleSchemeService;
+import com.chargebee.v4.services.PaymentScheduleSchemeService;
 
-import com.chargebee.v4.core.services.CardService;
+import com.chargebee.v4.services.CardService;
 
-import com.chargebee.v4.core.services.AttachedItemService;
+import com.chargebee.v4.services.AttachedItemService;
 
-import com.chargebee.v4.core.services.UsageEventService;
+import com.chargebee.v4.services.UsageEventService;
 
-import com.chargebee.v4.core.services.PriceVariantService;
+import com.chargebee.v4.services.PriceVariantService;
 
-import com.chargebee.v4.core.services.FullExportService;
+import com.chargebee.v4.services.FullExportService;
 
-import com.chargebee.v4.core.services.VirtualBankAccountService;
+import com.chargebee.v4.services.VirtualBankAccountService;
 
-import com.chargebee.v4.core.services.AddonService;
+import com.chargebee.v4.services.AddonService;
 
-import com.chargebee.v4.core.services.TpSiteUserService;
+import com.chargebee.v4.services.TpSiteUserService;
 
-import com.chargebee.v4.core.services.ConfigurationService;
+import com.chargebee.v4.services.ConfigurationService;
 
-import com.chargebee.v4.core.services.PricingPageSessionService;
+import com.chargebee.v4.services.PricingPageSessionService;
 
-import com.chargebee.v4.core.services.Pc2MigrationItemPriceService;
+import com.chargebee.v4.services.Pc2MigrationItemPriceService;
 
-import com.chargebee.v4.core.services.RuleService;
+import com.chargebee.v4.services.RuleService;
 
-import com.chargebee.v4.core.services.SubscriptionService;
+import com.chargebee.v4.services.SubscriptionService;
 
-import com.chargebee.v4.core.services.MediaService;
+import com.chargebee.v4.services.MediaService;
 
-import com.chargebee.v4.core.services.BusinessProfileService;
+import com.chargebee.v4.services.BusinessProfileService;
 
-import com.chargebee.v4.core.services.PromotionalCreditService;
+import com.chargebee.v4.services.PromotionalCreditService;
 
-import com.chargebee.v4.core.services.BrandConfigurationService;
+import com.chargebee.v4.services.BrandConfigurationService;
 
-import com.chargebee.v4.core.services.WebhookEndpointService;
+import com.chargebee.v4.services.WebhookEndpointService;
 
-import com.chargebee.v4.core.services.FeatureService;
+import com.chargebee.v4.services.FeatureService;
 
-import com.chargebee.v4.core.services.UnbilledChargesSettingService;
+import com.chargebee.v4.services.UnbilledChargesSettingService;
 
-import com.chargebee.v4.core.services.CurrencyService;
+import com.chargebee.v4.services.CurrencyService;
 
-import com.chargebee.v4.core.services.EventService;
+import com.chargebee.v4.services.EventService;
 
-import com.chargebee.v4.core.services.UsageFileService;
+import com.chargebee.v4.services.UsageFileService;
 
-import com.chargebee.v4.core.services.NonSubscriptionService;
+import com.chargebee.v4.services.NonSubscriptionService;
 
-import com.chargebee.v4.core.services.ResourceMigrationService;
+import com.chargebee.v4.services.ResourceMigrationService;
 
-import com.chargebee.v4.core.services.ProductService;
+import com.chargebee.v4.services.ProductService;
 
-import com.chargebee.v4.core.services.CouponCodeService;
+import com.chargebee.v4.services.CouponCodeService;
 
-import com.chargebee.v4.core.services.AddressService;
+import com.chargebee.v4.services.AddressService;
 
-import com.chargebee.v4.core.services.CouponService;
+import com.chargebee.v4.services.CouponService;
 
-import com.chargebee.v4.core.services.PortalSessionService;
+import com.chargebee.v4.services.PortalSessionService;
 
-import com.chargebee.v4.core.services.ItemPriceService;
+import com.chargebee.v4.services.ItemPriceService;
 
-import com.chargebee.v4.core.services.OfferFulfillmentService;
+import com.chargebee.v4.services.OfferFulfillmentService;
 
-import com.chargebee.v4.core.services.HostedPageService;
+import com.chargebee.v4.services.HostedPageService;
 
-import com.chargebee.v4.core.services.PurchaseService;
+import com.chargebee.v4.services.PurchaseService;
 
-import com.chargebee.v4.core.services.PaymentVoucherService;
+import com.chargebee.v4.services.PaymentVoucherService;
 
-import com.chargebee.v4.core.services.ItemFamilyService;
+import com.chargebee.v4.services.ItemFamilyService;
 
-import com.chargebee.v4.core.services.SubscriptionEntitlementService;
+import com.chargebee.v4.services.SubscriptionEntitlementService;
 
-import com.chargebee.v4.core.services.ThirdPartyEntityMappingService;
+import com.chargebee.v4.services.ThirdPartyEntityMappingService;
 
-import com.chargebee.v4.core.services.EntitlementOverrideService;
+import com.chargebee.v4.services.EntitlementOverrideService;
 
-import com.chargebee.v4.core.services.ThirdPartyConfigurationService;
+import com.chargebee.v4.services.ThirdPartyConfigurationService;
 
-import com.chargebee.v4.core.services.UnbilledChargeService;
+import com.chargebee.v4.services.UnbilledChargeService;
 
-import com.chargebee.v4.core.services.CommentService;
+import com.chargebee.v4.services.CommentService;
 
-import com.chargebee.v4.core.services.InvoiceService;
+import com.chargebee.v4.services.InvoiceService;
 
-import com.chargebee.v4.core.services.TransactionService;
+import com.chargebee.v4.services.TransactionService;
 
-import com.chargebee.v4.core.services.ThirdPartySyncDetailService;
+import com.chargebee.v4.services.ThirdPartySyncDetailService;
 
-import com.chargebee.v4.core.services.CustomerService;
+import com.chargebee.v4.services.CustomerService;
 
-import com.chargebee.v4.core.services.ItemEntitlementService;
+import com.chargebee.v4.services.ItemEntitlementService;
 
 /**
  * Auto-generated service registry for lazy initialization of all Chargebee services. This class
@@ -339,7 +339,7 @@ final class ServiceRegistry {
    * Get or create the GiftService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  GiftService gift() {
+  GiftService gifts() {
     if (giftService == null) {
       synchronized (this) {
         if (giftService == null) {
@@ -354,7 +354,7 @@ GiftService gift() {
    * Get or create the CsvTaxRuleService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  CsvTaxRuleService csvTaxRule() {
+  CsvTaxRuleService csvTaxRules() {
     if (csvTaxRuleService == null) {
       synchronized (this) {
         if (csvTaxRuleService == null) {
@@ -369,7 +369,7 @@ CsvTaxRuleService csvTaxRule() {
    * Get or create the UsageService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  UsageService usage() {
+  UsageService usages() {
     if (usageService == null) {
       synchronized (this) {
         if (usageService == null) {
@@ -384,7 +384,7 @@ UsageService usage() {
    * Get or create the TimeMachineService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  TimeMachineService timeMachine() {
+  TimeMachineService timeMachines() {
     if (timeMachineService == null) {
       synchronized (this) {
         if (timeMachineService == null) {
@@ -399,7 +399,7 @@ TimeMachineService timeMachine() {
    * Get or create the BusinessEntityService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  BusinessEntityService businessEntity() {
+  BusinessEntityService businessEntities() {
     if (businessEntityService == null) {
       synchronized (this) {
         if (businessEntityService == null) {
@@ -414,7 +414,7 @@ BusinessEntityService businessEntity() {
    * Get or create the OfferEventService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  OfferEventService offerEvent() {
+  OfferEventService offerEvents() {
     if (offerEventService == null) {
       synchronized (this) {
         if (offerEventService == null) {
@@ -429,7 +429,7 @@ OfferEventService offerEvent() {
    * Get or create the InAppSubscriptionService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  InAppSubscriptionService inAppSubscription() {
+  InAppSubscriptionService inAppSubscriptions() {
     if (inAppSubscriptionService == null) {
       synchronized (this) {
         if (inAppSubscriptionService == null) {
@@ -444,7 +444,7 @@ InAppSubscriptionService inAppSubscription() {
    * Get or create the Pc2MigrationService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  Pc2MigrationService pc2Migration() {
+  Pc2MigrationService pc2Migrations() {
     if (pc2MigrationService == null) {
       synchronized (this) {
         if (pc2MigrationService == null) {
@@ -459,7 +459,7 @@ Pc2MigrationService pc2Migration() {
    * Get or create the CreditNoteService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  CreditNoteService creditNote() {
+  CreditNoteService creditNotes() {
     if (creditNoteService == null) {
       synchronized (this) {
         if (creditNoteService == null) {
@@ -474,7 +474,7 @@ CreditNoteService creditNote() {
    * Get or create the CouponSetService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  CouponSetService couponSet() {
+  CouponSetService couponSets() {
     if (couponSetService == null) {
       synchronized (this) {
         if (couponSetService == null) {
@@ -489,7 +489,7 @@ CouponSetService couponSet() {
    * Get or create the QuoteService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  QuoteService quote() {
+  QuoteService quotes() {
     if (quoteService == null) {
       synchronized (this) {
         if (quoteService == null) {
@@ -504,7 +504,7 @@ QuoteService quote() {
    * Get or create the Pc2MigrationItemService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  Pc2MigrationItemService pc2MigrationItem() {
+  Pc2MigrationItemService pc2MigrationItems() {
     if (pc2MigrationItemService == null) {
       synchronized (this) {
         if (pc2MigrationItemService == null) {
@@ -519,7 +519,7 @@ Pc2MigrationItemService pc2MigrationItem() {
    * Get or create the EstimateService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  EstimateService estimate() {
+  EstimateService estimates() {
     if (estimateService == null) {
       synchronized (this) {
         if (estimateService == null) {
@@ -534,7 +534,7 @@ EstimateService estimate() {
    * Get or create the VariantService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  VariantService variant() {
+  VariantService variants() {
     if (variantService == null) {
       synchronized (this) {
         if (variantService == null) {
@@ -549,7 +549,7 @@ VariantService variant() {
    * Get or create the Pc2MigrationItemFamilyService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  Pc2MigrationItemFamilyService pc2MigrationItemFamily() {
+  Pc2MigrationItemFamilyService pc2MigrationItemFamilies() {
     if (pc2MigrationItemFamilyService == null) {
       synchronized (this) {
         if (pc2MigrationItemFamilyService == null) {
@@ -564,7 +564,7 @@ Pc2MigrationItemFamilyService pc2MigrationItemFamily() {
    * Get or create the PaymentSourceService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  PaymentSourceService paymentSource() {
+  PaymentSourceService paymentSources() {
     if (paymentSourceService == null) {
       synchronized (this) {
         if (paymentSourceService == null) {
@@ -579,7 +579,7 @@ PaymentSourceService paymentSource() {
    * Get or create the RecordedPurchaseService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  RecordedPurchaseService recordedPurchase() {
+  RecordedPurchaseService recordedPurchases() {
     if (recordedPurchaseService == null) {
       synchronized (this) {
         if (recordedPurchaseService == null) {
@@ -594,7 +594,7 @@ RecordedPurchaseService recordedPurchase() {
    * Get or create the PlanService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  PlanService plan() {
+  PlanService plans() {
     if (planService == null) {
       synchronized (this) {
         if (planService == null) {
@@ -609,7 +609,7 @@ PlanService plan() {
    * Get or create the ExportService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  ExportService export() {
+  ExportService exports() {
     if (exportService == null) {
       synchronized (this) {
         if (exportService == null) {
@@ -624,7 +624,7 @@ ExportService export() {
    * Get or create the OrderService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  OrderService order() {
+  OrderService orders() {
     if (orderService == null) {
       synchronized (this) {
         if (orderService == null) {
@@ -639,7 +639,7 @@ OrderService order() {
    * Get or create the ItemService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  ItemService item() {
+  ItemService items() {
     if (itemService == null) {
       synchronized (this) {
         if (itemService == null) {
@@ -654,7 +654,7 @@ ItemService item() {
    * Get or create the CustomerEntitlementService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  CustomerEntitlementService customerEntitlement() {
+  CustomerEntitlementService customerEntitlements() {
     if (customerEntitlementService == null) {
       synchronized (this) {
         if (customerEntitlementService == null) {
@@ -669,7 +669,7 @@ CustomerEntitlementService customerEntitlement() {
    * Get or create the PersonalizedOfferService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  PersonalizedOfferService personalizedOffer() {
+  PersonalizedOfferService personalizedOffers() {
     if (personalizedOfferService == null) {
       synchronized (this) {
         if (personalizedOfferService == null) {
@@ -684,7 +684,7 @@ PersonalizedOfferService personalizedOffer() {
    * Get or create the OmnichannelSubscriptionService instance. Thread-safe lazy initialization
    * using double-checked locking.
    */
-  OmnichannelSubscriptionService omnichannelSubscription() {
+  OmnichannelSubscriptionService omnichannelSubscriptions() {
     if (omnichannelSubscriptionService == null) {
       synchronized (this) {
         if (omnichannelSubscriptionService == null) {
@@ -699,7 +699,7 @@ OmnichannelSubscriptionService omnichannelSubscription() {
    * Get or create the OmnichannelSubscriptionItemService instance. Thread-safe lazy initialization
    * using double-checked locking.
    */
-  OmnichannelSubscriptionItemService omnichannelSubscriptionItem() {
+  OmnichannelSubscriptionItemService omnichannelSubscriptionItems() {
     if (omnichannelSubscriptionItemService == null) {
       synchronized (this) {
         if (omnichannelSubscriptionItemService == null) {
@@ -714,7 +714,7 @@ OmnichannelSubscriptionItemService omnichannelSubscriptionItem() {
    * Get or create the RampService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  RampService ramp() {
+  RampService ramps() {
     if (rampService == null) {
       synchronized (this) {
         if (rampService == null) {
@@ -729,7 +729,7 @@ RampService ramp() {
    * Get or create the OmnichannelOneTimeOrderService instance. Thread-safe lazy initialization
    * using double-checked locking.
    */
-  OmnichannelOneTimeOrderService omnichannelOneTimeOrder() {
+  OmnichannelOneTimeOrderService omnichannelOneTimeOrders() {
     if (omnichannelOneTimeOrderService == null) {
       synchronized (this) {
         if (omnichannelOneTimeOrderService == null) {
@@ -744,7 +744,7 @@ OmnichannelOneTimeOrderService omnichannelOneTimeOrder() {
    * Get or create the DifferentialPriceService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  DifferentialPriceService differentialPrice() {
+  DifferentialPriceService differentialPrices() {
     if (differentialPriceService == null) {
       synchronized (this) {
         if (differentialPriceService == null) {
@@ -759,7 +759,7 @@ DifferentialPriceService differentialPrice() {
    * Get or create the EntitlementService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  EntitlementService entitlement() {
+  EntitlementService entitlements() {
     if (entitlementService == null) {
       synchronized (this) {
         if (entitlementService == null) {
@@ -774,7 +774,7 @@ EntitlementService entitlement() {
    * Get or create the AdditionalBillingLogiqService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  AdditionalBillingLogiqService additionalBillingLogiq() {
+  AdditionalBillingLogiqService additionalBillingLogiqs() {
     if (additionalBillingLogiqService == null) {
       synchronized (this) {
         if (additionalBillingLogiqService == null) {
@@ -789,7 +789,7 @@ AdditionalBillingLogiqService additionalBillingLogiq() {
    * Get or create the SubscriptionSettingService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  SubscriptionSettingService subscriptionSetting() {
+  SubscriptionSettingService subscriptionSettings() {
     if (subscriptionSettingService == null) {
       synchronized (this) {
         if (subscriptionSettingService == null) {
@@ -804,7 +804,7 @@ SubscriptionSettingService subscriptionSetting() {
    * Get or create the SiteMigrationDetailService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  SiteMigrationDetailService siteMigrationDetail() {
+  SiteMigrationDetailService siteMigrationDetails() {
     if (siteMigrationDetailService == null) {
       synchronized (this) {
         if (siteMigrationDetailService == null) {
@@ -819,7 +819,7 @@ SiteMigrationDetailService siteMigrationDetail() {
    * Get or create the PaymentIntentService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  PaymentIntentService paymentIntent() {
+  PaymentIntentService paymentIntents() {
     if (paymentIntentService == null) {
       synchronized (this) {
         if (paymentIntentService == null) {
@@ -834,7 +834,7 @@ PaymentIntentService paymentIntent() {
    * Get or create the PaymentScheduleSchemeService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  PaymentScheduleSchemeService paymentScheduleScheme() {
+  PaymentScheduleSchemeService paymentScheduleSchemes() {
     if (paymentScheduleSchemeService == null) {
       synchronized (this) {
         if (paymentScheduleSchemeService == null) {
@@ -849,7 +849,7 @@ PaymentScheduleSchemeService paymentScheduleScheme() {
    * Get or create the CardService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  CardService card() {
+  CardService cards() {
     if (cardService == null) {
       synchronized (this) {
         if (cardService == null) {
@@ -864,7 +864,7 @@ CardService card() {
    * Get or create the AttachedItemService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  AttachedItemService attachedItem() {
+  AttachedItemService attachedItems() {
     if (attachedItemService == null) {
       synchronized (this) {
         if (attachedItemService == null) {
@@ -879,7 +879,7 @@ AttachedItemService attachedItem() {
    * Get or create the UsageEventService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  UsageEventService usageEvent() {
+  UsageEventService usageEvents() {
     if (usageEventService == null) {
       synchronized (this) {
         if (usageEventService == null) {
@@ -894,7 +894,7 @@ UsageEventService usageEvent() {
    * Get or create the PriceVariantService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  PriceVariantService priceVariant() {
+  PriceVariantService priceVariants() {
     if (priceVariantService == null) {
       synchronized (this) {
         if (priceVariantService == null) {
@@ -909,7 +909,7 @@ PriceVariantService priceVariant() {
    * Get or create the FullExportService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  FullExportService fullExport() {
+  FullExportService fullExports() {
     if (fullExportService == null) {
       synchronized (this) {
         if (fullExportService == null) {
@@ -924,7 +924,7 @@ FullExportService fullExport() {
    * Get or create the VirtualBankAccountService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  VirtualBankAccountService virtualBankAccount() {
+  VirtualBankAccountService virtualBankAccounts() {
     if (virtualBankAccountService == null) {
       synchronized (this) {
         if (virtualBankAccountService == null) {
@@ -939,7 +939,7 @@ VirtualBankAccountService virtualBankAccount() {
    * Get or create the AddonService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  AddonService addon() {
+  AddonService addons() {
     if (addonService == null) {
       synchronized (this) {
         if (addonService == null) {
@@ -954,7 +954,7 @@ AddonService addon() {
    * Get or create the TpSiteUserService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  TpSiteUserService tpSiteUser() {
+  TpSiteUserService tpSiteUsers() {
     if (tpSiteUserService == null) {
       synchronized (this) {
         if (tpSiteUserService == null) {
@@ -969,7 +969,7 @@ TpSiteUserService tpSiteUser() {
    * Get or create the ConfigurationService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  ConfigurationService configuration() {
+  ConfigurationService configurations() {
     if (configurationService == null) {
       synchronized (this) {
         if (configurationService == null) {
@@ -984,7 +984,7 @@ ConfigurationService configuration() {
    * Get or create the PricingPageSessionService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  PricingPageSessionService pricingPageSession() {
+  PricingPageSessionService pricingPageSessions() {
     if (pricingPageSessionService == null) {
       synchronized (this) {
         if (pricingPageSessionService == null) {
@@ -999,7 +999,7 @@ PricingPageSessionService pricingPageSession() {
    * Get or create the Pc2MigrationItemPriceService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  Pc2MigrationItemPriceService pc2MigrationItemPrice() {
+  Pc2MigrationItemPriceService pc2MigrationItemPrices() {
     if (pc2MigrationItemPriceService == null) {
       synchronized (this) {
         if (pc2MigrationItemPriceService == null) {
@@ -1014,7 +1014,7 @@ Pc2MigrationItemPriceService pc2MigrationItemPrice() {
    * Get or create the RuleService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  RuleService rule() {
+  RuleService rules() {
     if (ruleService == null) {
       synchronized (this) {
         if (ruleService == null) {
@@ -1029,7 +1029,7 @@ RuleService rule() {
    * Get or create the SubscriptionService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  SubscriptionService subscription() {
+  SubscriptionService subscriptions() {
     if (subscriptionService == null) {
       synchronized (this) {
         if (subscriptionService == null) {
@@ -1044,7 +1044,7 @@ SubscriptionService subscription() {
    * Get or create the MediaService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  MediaService media() {
+  MediaService medias() {
     if (mediaService == null) {
       synchronized (this) {
         if (mediaService == null) {
@@ -1059,7 +1059,7 @@ MediaService media() {
    * Get or create the BusinessProfileService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  BusinessProfileService businessProfile() {
+  BusinessProfileService businessProfiles() {
     if (businessProfileService == null) {
       synchronized (this) {
         if (businessProfileService == null) {
@@ -1074,7 +1074,7 @@ BusinessProfileService businessProfile() {
    * Get or create the PromotionalCreditService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  PromotionalCreditService promotionalCredit() {
+  PromotionalCreditService promotionalCredits() {
     if (promotionalCreditService == null) {
       synchronized (this) {
         if (promotionalCreditService == null) {
@@ -1089,7 +1089,7 @@ PromotionalCreditService promotionalCredit() {
    * Get or create the BrandConfigurationService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  BrandConfigurationService brandConfiguration() {
+  BrandConfigurationService brandConfigurations() {
     if (brandConfigurationService == null) {
       synchronized (this) {
         if (brandConfigurationService == null) {
@@ -1104,7 +1104,7 @@ BrandConfigurationService brandConfiguration() {
    * Get or create the WebhookEndpointService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  WebhookEndpointService webhookEndpoint() {
+  WebhookEndpointService webhookEndpoints() {
     if (webhookEndpointService == null) {
       synchronized (this) {
         if (webhookEndpointService == null) {
@@ -1119,7 +1119,7 @@ WebhookEndpointService webhookEndpoint() {
    * Get or create the FeatureService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  FeatureService feature() {
+  FeatureService features() {
     if (featureService == null) {
       synchronized (this) {
         if (featureService == null) {
@@ -1134,7 +1134,7 @@ FeatureService feature() {
    * Get or create the UnbilledChargesSettingService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  UnbilledChargesSettingService unbilledChargesSetting() {
+  UnbilledChargesSettingService unbilledChargesSettings() {
     if (unbilledChargesSettingService == null) {
       synchronized (this) {
         if (unbilledChargesSettingService == null) {
@@ -1149,7 +1149,7 @@ UnbilledChargesSettingService unbilledChargesSetting() {
    * Get or create the CurrencyService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  CurrencyService currency() {
+  CurrencyService currencies() {
     if (currencyService == null) {
       synchronized (this) {
         if (currencyService == null) {
@@ -1164,7 +1164,7 @@ CurrencyService currency() {
    * Get or create the EventService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  EventService event() {
+  EventService events() {
     if (eventService == null) {
       synchronized (this) {
         if (eventService == null) {
@@ -1179,7 +1179,7 @@ EventService event() {
    * Get or create the UsageFileService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  UsageFileService usageFile() {
+  UsageFileService usageFiles() {
     if (usageFileService == null) {
       synchronized (this) {
         if (usageFileService == null) {
@@ -1194,7 +1194,7 @@ UsageFileService usageFile() {
    * Get or create the NonSubscriptionService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  NonSubscriptionService nonSubscription() {
+  NonSubscriptionService nonSubscriptions() {
     if (nonSubscriptionService == null) {
       synchronized (this) {
         if (nonSubscriptionService == null) {
@@ -1209,7 +1209,7 @@ NonSubscriptionService nonSubscription() {
    * Get or create the ResourceMigrationService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  ResourceMigrationService resourceMigration() {
+  ResourceMigrationService resourceMigrations() {
     if (resourceMigrationService == null) {
       synchronized (this) {
         if (resourceMigrationService == null) {
@@ -1224,7 +1224,7 @@ ResourceMigrationService resourceMigration() {
    * Get or create the ProductService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  ProductService product() {
+  ProductService products() {
     if (productService == null) {
       synchronized (this) {
         if (productService == null) {
@@ -1239,7 +1239,7 @@ ProductService product() {
    * Get or create the CouponCodeService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  CouponCodeService couponCode() {
+  CouponCodeService couponCodes() {
     if (couponCodeService == null) {
       synchronized (this) {
         if (couponCodeService == null) {
@@ -1254,7 +1254,7 @@ CouponCodeService couponCode() {
    * Get or create the AddressService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  AddressService address() {
+  AddressService addresses() {
     if (addressService == null) {
       synchronized (this) {
         if (addressService == null) {
@@ -1269,7 +1269,7 @@ AddressService address() {
    * Get or create the CouponService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  CouponService coupon() {
+  CouponService coupons() {
     if (couponService == null) {
       synchronized (this) {
         if (couponService == null) {
@@ -1284,7 +1284,7 @@ CouponService coupon() {
    * Get or create the PortalSessionService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  PortalSessionService portalSession() {
+  PortalSessionService portalSessions() {
     if (portalSessionService == null) {
       synchronized (this) {
         if (portalSessionService == null) {
@@ -1299,7 +1299,7 @@ PortalSessionService portalSession() {
    * Get or create the ItemPriceService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  ItemPriceService itemPrice() {
+  ItemPriceService itemPrices() {
     if (itemPriceService == null) {
       synchronized (this) {
         if (itemPriceService == null) {
@@ -1314,7 +1314,7 @@ ItemPriceService itemPrice() {
    * Get or create the OfferFulfillmentService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  OfferFulfillmentService offerFulfillment() {
+  OfferFulfillmentService offerFulfillments() {
     if (offerFulfillmentService == null) {
       synchronized (this) {
         if (offerFulfillmentService == null) {
@@ -1329,7 +1329,7 @@ OfferFulfillmentService offerFulfillment() {
    * Get or create the HostedPageService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  HostedPageService hostedPage() {
+  HostedPageService hostedPages() {
     if (hostedPageService == null) {
       synchronized (this) {
         if (hostedPageService == null) {
@@ -1344,7 +1344,7 @@ HostedPageService hostedPage() {
    * Get or create the PurchaseService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  PurchaseService purchase() {
+  PurchaseService purchases() {
     if (purchaseService == null) {
       synchronized (this) {
         if (purchaseService == null) {
@@ -1359,7 +1359,7 @@ PurchaseService purchase() {
    * Get or create the PaymentVoucherService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  PaymentVoucherService paymentVoucher() {
+  PaymentVoucherService paymentVouchers() {
     if (paymentVoucherService == null) {
       synchronized (this) {
         if (paymentVoucherService == null) {
@@ -1374,7 +1374,7 @@ PaymentVoucherService paymentVoucher() {
    * Get or create the ItemFamilyService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  ItemFamilyService itemFamily() {
+  ItemFamilyService itemFamilies() {
     if (itemFamilyService == null) {
       synchronized (this) {
         if (itemFamilyService == null) {
@@ -1389,7 +1389,7 @@ ItemFamilyService itemFamily() {
    * Get or create the SubscriptionEntitlementService instance. Thread-safe lazy initialization
    * using double-checked locking.
    */
-  SubscriptionEntitlementService subscriptionEntitlement() {
+  SubscriptionEntitlementService subscriptionEntitlements() {
     if (subscriptionEntitlementService == null) {
       synchronized (this) {
         if (subscriptionEntitlementService == null) {
@@ -1404,7 +1404,7 @@ SubscriptionEntitlementService subscriptionEntitlement() {
    * Get or create the ThirdPartyEntityMappingService instance. Thread-safe lazy initialization
    * using double-checked locking.
    */
-  ThirdPartyEntityMappingService thirdPartyEntityMapping() {
+  ThirdPartyEntityMappingService thirdPartyEntityMappings() {
     if (thirdPartyEntityMappingService == null) {
       synchronized (this) {
         if (thirdPartyEntityMappingService == null) {
@@ -1419,7 +1419,7 @@ ThirdPartyEntityMappingService thirdPartyEntityMapping() {
    * Get or create the EntitlementOverrideService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  EntitlementOverrideService entitlementOverride() {
+  EntitlementOverrideService entitlementOverrides() {
     if (entitlementOverrideService == null) {
       synchronized (this) {
         if (entitlementOverrideService == null) {
@@ -1434,7 +1434,7 @@ EntitlementOverrideService entitlementOverride() {
    * Get or create the ThirdPartyConfigurationService instance. Thread-safe lazy initialization
    * using double-checked locking.
    */
-  ThirdPartyConfigurationService thirdPartyConfiguration() {
+  ThirdPartyConfigurationService thirdPartyConfigurations() {
     if (thirdPartyConfigurationService == null) {
       synchronized (this) {
         if (thirdPartyConfigurationService == null) {
@@ -1449,7 +1449,7 @@ ThirdPartyConfigurationService thirdPartyConfiguration() {
    * Get or create the UnbilledChargeService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  UnbilledChargeService unbilledCharge() {
+  UnbilledChargeService unbilledCharges() {
     if (unbilledChargeService == null) {
       synchronized (this) {
         if (unbilledChargeService == null) {
@@ -1464,7 +1464,7 @@ UnbilledChargeService unbilledCharge() {
    * Get or create the CommentService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  CommentService comment() {
+  CommentService comments() {
     if (commentService == null) {
       synchronized (this) {
         if (commentService == null) {
@@ -1479,7 +1479,7 @@ CommentService comment() {
    * Get or create the InvoiceService instance. Thread-safe lazy initialization using double-checked
    * locking.
    */
-  InvoiceService invoice() {
+  InvoiceService invoices() {
     if (invoiceService == null) {
       synchronized (this) {
         if (invoiceService == null) {
@@ -1494,7 +1494,7 @@ InvoiceService invoice() {
    * Get or create the TransactionService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  TransactionService transaction() {
+  TransactionService transactions() {
     if (transactionService == null) {
       synchronized (this) {
         if (transactionService == null) {
@@ -1509,7 +1509,7 @@ TransactionService transaction() {
    * Get or create the ThirdPartySyncDetailService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  ThirdPartySyncDetailService thirdPartySyncDetail() {
+  ThirdPartySyncDetailService thirdPartySyncDetails() {
     if (thirdPartySyncDetailService == null) {
       synchronized (this) {
         if (thirdPartySyncDetailService == null) {
@@ -1524,7 +1524,7 @@ ThirdPartySyncDetailService thirdPartySyncDetail() {
    * Get or create the CustomerService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  CustomerService customer() {
+  CustomerService customers() {
     if (customerService == null) {
       synchronized (this) {
         if (customerService == null) {
@@ -1539,7 +1539,7 @@ CustomerService customer() {
    * Get or create the ItemEntitlementService instance. Thread-safe lazy initialization using
    * double-checked locking.
    */
-  ItemEntitlementService itemEntitlement() {
+  ItemEntitlementService itemEntitlements() {
     if (itemEntitlementService == null) {
       synchronized (this) {
         if (itemEntitlementService == null) {
diff --git a/src/main/java/com/chargebee/v4/client/request/RequestInterceptor.java b/src/main/java/com/chargebee/v4/client/request/RequestInterceptor.java
index 6db6dfb3..67f2e451 100644
--- a/src/main/java/com/chargebee/v4/client/request/RequestInterceptor.java
+++ b/src/main/java/com/chargebee/v4/client/request/RequestInterceptor.java
@@ -1,5 +1,6 @@
 package com.chargebee.v4.client.request;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Request;
 import com.chargebee.v4.transport.Response;
 import java.util.concurrent.CompletableFuture;
@@ -51,9 +52,9 @@ public interface RequestInterceptor {
      * 
      * @param requestWrap wrapper containing the transport request and execution context
      * @return the transport response, either from proceeding or custom implementation
-     * @throws Exception if request processing fails
+     * @throws ChargebeeException if request processing fails
      */
-    Response handleRequest(RequestWrap requestWrap) throws Exception;
+    Response handleRequest(RequestWrap requestWrap) throws ChargebeeException;
     
     /**
      * Handle the intercepted request asynchronously.
diff --git a/src/main/java/com/chargebee/v4/client/request/RequestWrap.java b/src/main/java/com/chargebee/v4/client/request/RequestWrap.java
index be0b75e5..183da7e6 100644
--- a/src/main/java/com/chargebee/v4/client/request/RequestWrap.java
+++ b/src/main/java/com/chargebee/v4/client/request/RequestWrap.java
@@ -1,6 +1,7 @@
 package com.chargebee.v4.client.request;
 
 import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Request;
 import com.chargebee.v4.transport.Response;
 import java.util.concurrent.Callable;
@@ -95,9 +96,9 @@ public ChargebeeClient getClient() {
      * standard request processing after any modifications.</p>
      * 
      * @return the transport response from normal execution
-     * @throws Exception if request execution fails
+     * @throws ChargebeeException if request execution fails
      */
-    public Response proceed() throws Exception {
+    public Response proceed() throws ChargebeeException {
         return call();
     }
     
@@ -120,10 +121,10 @@ public CompletableFuture<Response> proceedAsync() {
      * and transport layer.</p>
      * 
      * @return the transport response
-     * @throws Exception if request execution fails
+     * @throws ChargebeeException if request execution fails
      */
     @Override
-    public Response call() throws Exception {
+    public Response call() throws ChargebeeException {
         return client.sendWithRetry(request);
     }
 }
\ No newline at end of file
diff --git a/src/main/java/com/chargebee/v4/core/http/ChargebeeApiResponse.java b/src/main/java/com/chargebee/v4/core/http/ChargebeeApiResponse.java
deleted file mode 100644
index 4ae5fd96..00000000
--- a/src/main/java/com/chargebee/v4/core/http/ChargebeeApiResponse.java
+++ /dev/null
@@ -1,75 +0,0 @@
-package com.chargebee.core.http;
-
-import com.chargebee.v4.transport.Response;
-
-/**
- * Wrapper for HTTP responses that provides access to both raw response data
- * and parsed objects.
- */
-public final class ChargebeeApiResponse<T> {
-    private final Response rawResponse;
-    private final T parsedObject;
-    
-    public ChargebeeApiResponse(Response rawResponse, T parsedObject) {
-        this.rawResponse = rawResponse;
-        this.parsedObject = parsedObject;
-    }
-    
-    /**
-     * Get the HTTP status code.
-     */
-    public int statusCode() {
-        return rawResponse.getStatusCode();
-    }
-    
-    /**
-     * Get the response headers.
-     */
-    public Headers headers() {
-        return new Headers(rawResponse.getHeaders());
-    }
-    
-    /**
-     * Get the raw response body as string.
-     */
-    public String rawBody() {
-        return rawResponse.getBodyAsString();
-    }
-    
-    /**
-     * Get the raw response body as bytes.
-     */
-    public byte[] rawBodyBytes() {
-        return rawResponse.getBody();
-    }
-    
-    /**
-     * Get the parsed object.
-     */
-    public T parse() {
-        return parsedObject;
-    }
-    
-    /**
-     * Check if the response was successful (2xx status code).
-     */
-    public boolean isSuccessful() {
-        return rawResponse.isSuccessful();
-    }
-    
-    /**
-     * Get the underlying raw Response object.
-     */
-    public Response getRawResponse() {
-        return rawResponse;
-    }
-    
-    @Override
-    public String toString() {
-        return "ChargebeeApiResponse{" +
-                "statusCode=" + statusCode() +
-                ", headers=" + headers().names().size() + " headers" +
-                ", parsedObject=" + parsedObject +
-                '}';
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/com/chargebee/v4/core/http/Headers.java b/src/main/java/com/chargebee/v4/core/http/Headers.java
deleted file mode 100644
index dcff02ab..00000000
--- a/src/main/java/com/chargebee/v4/core/http/Headers.java
+++ /dev/null
@@ -1,60 +0,0 @@
-package com.chargebee.core.http;
-
-import java.util.*;
-
-/**
- * Immutable wrapper for HTTP response headers.
- */
-public final class Headers {
-    private final Map<String, List<String>> headers;
-    
-    public Headers(Map<String, List<String>> headers) {
-        this.headers = Collections.unmodifiableMap(new HashMap<>(headers));
-    }
-    
-    /**
-     * Get header value by name (case-insensitive).
-     */
-    public String get(String name) {
-        List<String> values = getAll(name);
-        return values != null && !values.isEmpty() ? values.get(0) : null;
-    }
-    
-    /**
-     * Get all header values by name (case-insensitive).
-     */
-    public List<String> getAll(String name) {
-        for (Map.Entry<String, List<String>> entry : headers.entrySet()) {
-            if (name.equalsIgnoreCase(entry.getKey())) {
-                return entry.getValue();
-            }
-        }
-        return null;
-    }
-    
-    /**
-     * Check if header exists (case-insensitive).
-     */
-    public boolean contains(String name) {
-        return getAll(name) != null;
-    }
-    
-    /**
-     * Get all header names.
-     */
-    public Set<String> names() {
-        return headers.keySet();
-    }
-    
-    /**
-     * Get the raw headers map.
-     */
-    public Map<String, List<String>> toMap() {
-        return headers;
-    }
-    
-    @Override
-    public String toString() {
-        return "Headers{" + headers + "}";
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonCopyParams.java b/src/main/java/com/chargebee/v4/core/models/addon/params/AddonCopyParams.java
deleted file mode 100644
index 132f5912..00000000
--- a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonCopyParams.java
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.addon.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class AddonCopyParams {
-
-  private final Map<String, Object> formData;
-
-  private AddonCopyParams(AddonCopyBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for AddonCopyParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static AddonCopyBuilder builder() {
-    return new AddonCopyBuilder();
-  }
-
-  public static final class AddonCopyBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private AddonCopyBuilder() {}
-
-    public AddonCopyBuilder fromSite(String value) {
-
-      formData.put("from_site", value);
-
-      return this;
-    }
-
-    public AddonCopyBuilder idAtFromSite(String value) {
-
-      formData.put("id_at_from_site", value);
-
-      return this;
-    }
-
-    public AddonCopyBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public AddonCopyBuilder forSiteMerging(Boolean value) {
-
-      formData.put("for_site_merging", value);
-
-      return this;
-    }
-
-    public AddonCopyParams build() {
-      return new AddonCopyParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonCreateParams.java b/src/main/java/com/chargebee/v4/core/models/addon/params/AddonCreateParams.java
deleted file mode 100644
index 12d85443..00000000
--- a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonCreateParams.java
+++ /dev/null
@@ -1,758 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.addon.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class AddonCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private AddonCreateParams(AddonCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for AddonCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static AddonCreateBuilder builder() {
-    return new AddonCreateBuilder();
-  }
-
-  public static final class AddonCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private AddonCreateBuilder() {}
-
-    public AddonCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder invoiceName(String value) {
-
-      formData.put("invoice_name", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder chargeType(ChargeType value) {
-
-      formData.put("charge_type", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder price(Long value) {
-
-      formData.put("price", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder period(Integer value) {
-
-      formData.put("period", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder periodUnit(PeriodUnit value) {
-
-      formData.put("period_unit", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder pricingModel(PricingModel value) {
-
-      formData.put("pricing_model", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public AddonCreateBuilder type(Type value) {
-
-      formData.put("type", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder unit(String value) {
-
-      formData.put("unit", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder enabledInPortal(Boolean value) {
-
-      formData.put("enabled_in_portal", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder taxable(Boolean value) {
-
-      formData.put("taxable", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder taxProfileId(String value) {
-
-      formData.put("tax_profile_id", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder avalaraSaleType(AvalaraSaleType value) {
-
-      formData.put("avalara_sale_type", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder avalaraTransactionType(Integer value) {
-
-      formData.put("avalara_transaction_type", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder avalaraServiceType(Integer value) {
-
-      formData.put("avalara_service_type", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder taxCode(String value) {
-
-      formData.put("tax_code", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder hsnCode(String value) {
-
-      formData.put("hsn_code", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder taxjarProductCode(String value) {
-
-      formData.put("taxjar_product_code", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public AddonCreateBuilder sku(String value) {
-
-      formData.put("sku", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder accountingCode(String value) {
-
-      formData.put("accounting_code", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder accountingCategory1(String value) {
-
-      formData.put("accounting_category1", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder accountingCategory2(String value) {
-
-      formData.put("accounting_category2", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder accountingCategory3(String value) {
-
-      formData.put("accounting_category3", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder accountingCategory4(String value) {
-
-      formData.put("accounting_category4", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder isShippable(Boolean value) {
-
-      formData.put("is_shippable", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder shippingFrequencyPeriod(Integer value) {
-
-      formData.put("shipping_frequency_period", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder shippingFrequencyPeriodUnit(ShippingFrequencyPeriodUnit value) {
-
-      formData.put("shipping_frequency_period_unit", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder includedInMrr(Boolean value) {
-
-      formData.put("included_in_mrr", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder showDescriptionInInvoices(Boolean value) {
-
-      formData.put("show_description_in_invoices", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder showDescriptionInQuotes(Boolean value) {
-
-      formData.put("show_description_in_quotes", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder priceInDecimal(String value) {
-
-      formData.put("price_in_decimal", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder prorationType(ProrationType value) {
-
-      formData.put("proration_type", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public AddonCreateBuilder tiers(List<TiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public AddonCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public AddonCreateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public AddonCreateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public AddonCreateParams build() {
-      return new AddonCreateParams(this);
-    }
-  }
-
-  public enum ChargeType {
-    RECURRING("recurring"),
-
-    NON_RECURRING("non_recurring"),
-
-    /** An enum member indicating that ChargeType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChargeType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChargeType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChargeType enumValue : ChargeType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    NOT_APPLICABLE("not_applicable"),
-
-    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PeriodUnit enumValue : PeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PricingModel {
-    FLAT_FEE("flat_fee"),
-
-    PER_UNIT("per_unit"),
-
-    TIERED("tiered"),
-
-    VOLUME("volume"),
-
-    STAIRSTEP("stairstep"),
-
-    /** An enum member indicating that PricingModel was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PricingModel(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PricingModel fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PricingModel enumValue : PricingModel.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Type {
-    ON_OFF("on_off"),
-
-    QUANTITY("quantity"),
-
-    TIERED("tiered"),
-
-    VOLUME("volume"),
-
-    STAIRSTEP("stairstep"),
-
-    /** An enum member indicating that Type was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Type(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Type fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Type enumValue : Type.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AvalaraSaleType {
-    WHOLESALE("wholesale"),
-
-    RETAIL("retail"),
-
-    CONSUMED("consumed"),
-
-    VENDOR_USE("vendor_use"),
-
-    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AvalaraSaleType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AvalaraSaleType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ShippingFrequencyPeriodUnit {
-    YEAR("year"),
-
-    MONTH("month"),
-
-    WEEK("week"),
-
-    DAY("day"),
-
-    /**
-     * An enum member indicating that ShippingFrequencyPeriodUnit was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    ShippingFrequencyPeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ShippingFrequencyPeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ShippingFrequencyPeriodUnit enumValue : ShippingFrequencyPeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ProrationType {
-    SITE_DEFAULT("site_default"),
-
-    PARTIAL_TERM("partial_term"),
-
-    FULL_TERM("full_term"),
-
-    /** An enum member indicating that ProrationType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ProrationType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ProrationType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ProrationType enumValue : ProrationType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Status {
-    ACTIVE("active"),
-
-    ARCHIVED("archived"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class TiersParams {
-
-    private final Map<String, Object> formData;
-
-    private TiersParams(TiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TiersBuilder builder() {
-      return new TiersBuilder();
-    }
-
-    public static final class TiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TiersBuilder() {}
-
-      public TiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public TiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersParams build() {
-        return new TiersParams(this);
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/addon/params/AddonDeleteParams.java
deleted file mode 100644
index bc21a23a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonDeleteParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.addon.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class AddonDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private AddonDeleteParams(AddonDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for AddonDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static AddonDeleteBuilder builder() {
-    return new AddonDeleteBuilder();
-  }
-
-  public static final class AddonDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private AddonDeleteBuilder() {}
-
-    public AddonDeleteParams build() {
-      return new AddonDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonUnarchiveParams.java b/src/main/java/com/chargebee/v4/core/models/addon/params/AddonUnarchiveParams.java
deleted file mode 100644
index 2856ca45..00000000
--- a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonUnarchiveParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.addon.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class AddonUnarchiveParams {
-
-  private final Map<String, Object> formData;
-
-  private AddonUnarchiveParams(AddonUnarchiveBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for AddonUnarchiveParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static AddonUnarchiveBuilder builder() {
-    return new AddonUnarchiveBuilder();
-  }
-
-  public static final class AddonUnarchiveBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private AddonUnarchiveBuilder() {}
-
-    public AddonUnarchiveParams build() {
-      return new AddonUnarchiveParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/addon/params/AddonUpdateParams.java
deleted file mode 100644
index 357c1117..00000000
--- a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonUpdateParams.java
+++ /dev/null
@@ -1,716 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.addon.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class AddonUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private AddonUpdateParams(AddonUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for AddonUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static AddonUpdateBuilder builder() {
-    return new AddonUpdateBuilder();
-  }
-
-  public static final class AddonUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private AddonUpdateBuilder() {}
-
-    public AddonUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder invoiceName(String value) {
-
-      formData.put("invoice_name", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder chargeType(ChargeType value) {
-
-      formData.put("charge_type", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder price(Long value) {
-
-      formData.put("price", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder period(Integer value) {
-
-      formData.put("period", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder periodUnit(PeriodUnit value) {
-
-      formData.put("period_unit", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder pricingModel(PricingModel value) {
-
-      formData.put("pricing_model", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public AddonUpdateBuilder type(Type value) {
-
-      formData.put("type", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder unit(String value) {
-
-      formData.put("unit", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder enabledInPortal(Boolean value) {
-
-      formData.put("enabled_in_portal", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder taxable(Boolean value) {
-
-      formData.put("taxable", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder taxProfileId(String value) {
-
-      formData.put("tax_profile_id", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder avalaraSaleType(AvalaraSaleType value) {
-
-      formData.put("avalara_sale_type", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder avalaraTransactionType(Integer value) {
-
-      formData.put("avalara_transaction_type", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder avalaraServiceType(Integer value) {
-
-      formData.put("avalara_service_type", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder taxCode(String value) {
-
-      formData.put("tax_code", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder hsnCode(String value) {
-
-      formData.put("hsn_code", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder taxjarProductCode(String value) {
-
-      formData.put("taxjar_product_code", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public AddonUpdateBuilder sku(String value) {
-
-      formData.put("sku", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder accountingCode(String value) {
-
-      formData.put("accounting_code", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder accountingCategory1(String value) {
-
-      formData.put("accounting_category1", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder accountingCategory2(String value) {
-
-      formData.put("accounting_category2", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder accountingCategory3(String value) {
-
-      formData.put("accounting_category3", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder accountingCategory4(String value) {
-
-      formData.put("accounting_category4", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder isShippable(Boolean value) {
-
-      formData.put("is_shippable", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder shippingFrequencyPeriod(Integer value) {
-
-      formData.put("shipping_frequency_period", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder shippingFrequencyPeriodUnit(ShippingFrequencyPeriodUnit value) {
-
-      formData.put("shipping_frequency_period_unit", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder includedInMrr(Boolean value) {
-
-      formData.put("included_in_mrr", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder showDescriptionInInvoices(Boolean value) {
-
-      formData.put("show_description_in_invoices", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder showDescriptionInQuotes(Boolean value) {
-
-      formData.put("show_description_in_quotes", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder priceInDecimal(String value) {
-
-      formData.put("price_in_decimal", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder prorationType(ProrationType value) {
-
-      formData.put("proration_type", value);
-
-      return this;
-    }
-
-    public AddonUpdateBuilder tiers(List<TiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public AddonUpdateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public AddonUpdateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public AddonUpdateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public AddonUpdateParams build() {
-      return new AddonUpdateParams(this);
-    }
-  }
-
-  public enum ChargeType {
-    RECURRING("recurring"),
-
-    NON_RECURRING("non_recurring"),
-
-    /** An enum member indicating that ChargeType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChargeType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChargeType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChargeType enumValue : ChargeType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    NOT_APPLICABLE("not_applicable"),
-
-    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PeriodUnit enumValue : PeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PricingModel {
-    FLAT_FEE("flat_fee"),
-
-    PER_UNIT("per_unit"),
-
-    TIERED("tiered"),
-
-    VOLUME("volume"),
-
-    STAIRSTEP("stairstep"),
-
-    /** An enum member indicating that PricingModel was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PricingModel(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PricingModel fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PricingModel enumValue : PricingModel.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Type {
-    ON_OFF("on_off"),
-
-    QUANTITY("quantity"),
-
-    TIERED("tiered"),
-
-    VOLUME("volume"),
-
-    STAIRSTEP("stairstep"),
-
-    /** An enum member indicating that Type was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Type(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Type fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Type enumValue : Type.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AvalaraSaleType {
-    WHOLESALE("wholesale"),
-
-    RETAIL("retail"),
-
-    CONSUMED("consumed"),
-
-    VENDOR_USE("vendor_use"),
-
-    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AvalaraSaleType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AvalaraSaleType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ShippingFrequencyPeriodUnit {
-    YEAR("year"),
-
-    MONTH("month"),
-
-    WEEK("week"),
-
-    DAY("day"),
-
-    /**
-     * An enum member indicating that ShippingFrequencyPeriodUnit was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    ShippingFrequencyPeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ShippingFrequencyPeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ShippingFrequencyPeriodUnit enumValue : ShippingFrequencyPeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ProrationType {
-    SITE_DEFAULT("site_default"),
-
-    PARTIAL_TERM("partial_term"),
-
-    FULL_TERM("full_term"),
-
-    /** An enum member indicating that ProrationType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ProrationType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ProrationType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ProrationType enumValue : ProrationType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class TiersParams {
-
-    private final Map<String, Object> formData;
-
-    private TiersParams(TiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TiersBuilder builder() {
-      return new TiersBuilder();
-    }
-
-    public static final class TiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TiersBuilder() {}
-
-      public TiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public TiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersParams build() {
-        return new TiersParams(this);
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/address/params/AddressUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/address/params/AddressUpdateParams.java
deleted file mode 100644
index 61205877..00000000
--- a/src/main/java/com/chargebee/v4/core/models/address/params/AddressUpdateParams.java
+++ /dev/null
@@ -1,187 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.address.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class AddressUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private AddressUpdateParams(AddressUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for AddressUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static AddressUpdateBuilder builder() {
-    return new AddressUpdateBuilder();
-  }
-
-  public static final class AddressUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private AddressUpdateBuilder() {}
-
-    public AddressUpdateBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder label(String value) {
-
-      formData.put("label", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder firstName(String value) {
-
-      formData.put("first_name", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder lastName(String value) {
-
-      formData.put("last_name", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder email(String value) {
-
-      formData.put("email", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder company(String value) {
-
-      formData.put("company", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder phone(String value) {
-
-      formData.put("phone", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder addr(String value) {
-
-      formData.put("addr", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder extendedAddr(String value) {
-
-      formData.put("extended_addr", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder extendedAddr2(String value) {
-
-      formData.put("extended_addr2", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder city(String value) {
-
-      formData.put("city", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder stateCode(String value) {
-
-      formData.put("state_code", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder state(String value) {
-
-      formData.put("state", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder zip(String value) {
-
-      formData.put("zip", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder country(String value) {
-
-      formData.put("country", value);
-
-      return this;
-    }
-
-    public AddressUpdateBuilder validationStatus(ValidationStatus value) {
-
-      formData.put("validation_status", value);
-
-      return this;
-    }
-
-    public AddressUpdateParams build() {
-      return new AddressUpdateParams(this);
-    }
-  }
-
-  public enum ValidationStatus {
-    NOT_VALIDATED("not_validated"),
-
-    VALID("valid"),
-
-    PARTIALLY_VALID("partially_valid"),
-
-    INVALID("invalid"),
-
-    /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ValidationStatus(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ValidationStatus fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ValidationStatus enumValue : ValidationStatus.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemCreateParams.java b/src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemCreateParams.java
deleted file mode 100644
index 455a28e7..00000000
--- a/src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemCreateParams.java
+++ /dev/null
@@ -1,165 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.attachedItem.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class AttachedItemCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private AttachedItemCreateParams(AttachedItemCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for AttachedItemCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static AttachedItemCreateBuilder builder() {
-    return new AttachedItemCreateBuilder();
-  }
-
-  public static final class AttachedItemCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private AttachedItemCreateBuilder() {}
-
-    public AttachedItemCreateBuilder itemId(String value) {
-
-      formData.put("item_id", value);
-
-      return this;
-    }
-
-    public AttachedItemCreateBuilder type(Type value) {
-
-      formData.put("type", value);
-
-      return this;
-    }
-
-    public AttachedItemCreateBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public AttachedItemCreateBuilder quantity(Integer value) {
-
-      formData.put("quantity", value);
-
-      return this;
-    }
-
-    public AttachedItemCreateBuilder quantityInDecimal(String value) {
-
-      formData.put("quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public AttachedItemCreateBuilder chargeOnEvent(ChargeOnEvent value) {
-
-      formData.put("charge_on_event", value);
-
-      return this;
-    }
-
-    public AttachedItemCreateBuilder chargeOnce(Boolean value) {
-
-      formData.put("charge_once", value);
-
-      return this;
-    }
-
-    public AttachedItemCreateBuilder businessEntityId(String value) {
-
-      formData.put("business_entity_id", value);
-
-      return this;
-    }
-
-    public AttachedItemCreateParams build() {
-      return new AttachedItemCreateParams(this);
-    }
-  }
-
-  public enum Type {
-    RECOMMENDED("recommended"),
-
-    MANDATORY("mandatory"),
-
-    OPTIONAL("optional"),
-
-    /** An enum member indicating that Type was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Type(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Type fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Type enumValue : Type.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChargeOnEvent {
-    SUBSCRIPTION_CREATION("subscription_creation"),
-
-    SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-    PLAN_ACTIVATION("plan_activation"),
-
-    SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-    CONTRACT_TERMINATION("contract_termination"),
-
-    ON_DEMAND("on_demand"),
-
-    /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChargeOnEvent(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChargeOnEvent fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemDeleteParams.java
deleted file mode 100644
index 04e6ac35..00000000
--- a/src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemDeleteParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.attachedItem.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class AttachedItemDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private AttachedItemDeleteParams(AttachedItemDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for AttachedItemDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static AttachedItemDeleteBuilder builder() {
-    return new AttachedItemDeleteBuilder();
-  }
-
-  public static final class AttachedItemDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private AttachedItemDeleteBuilder() {}
-
-    public AttachedItemDeleteBuilder parentItemId(String value) {
-
-      formData.put("parent_item_id", value);
-
-      return this;
-    }
-
-    public AttachedItemDeleteParams build() {
-      return new AttachedItemDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemUpdateParams.java
deleted file mode 100644
index 3e947a5c..00000000
--- a/src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemUpdateParams.java
+++ /dev/null
@@ -1,158 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.attachedItem.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class AttachedItemUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private AttachedItemUpdateParams(AttachedItemUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for AttachedItemUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static AttachedItemUpdateBuilder builder() {
-    return new AttachedItemUpdateBuilder();
-  }
-
-  public static final class AttachedItemUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private AttachedItemUpdateBuilder() {}
-
-    public AttachedItemUpdateBuilder parentItemId(String value) {
-
-      formData.put("parent_item_id", value);
-
-      return this;
-    }
-
-    public AttachedItemUpdateBuilder type(Type value) {
-
-      formData.put("type", value);
-
-      return this;
-    }
-
-    public AttachedItemUpdateBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public AttachedItemUpdateBuilder quantity(Integer value) {
-
-      formData.put("quantity", value);
-
-      return this;
-    }
-
-    public AttachedItemUpdateBuilder quantityInDecimal(String value) {
-
-      formData.put("quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public AttachedItemUpdateBuilder chargeOnEvent(ChargeOnEvent value) {
-
-      formData.put("charge_on_event", value);
-
-      return this;
-    }
-
-    public AttachedItemUpdateBuilder chargeOnce(Boolean value) {
-
-      formData.put("charge_once", value);
-
-      return this;
-    }
-
-    public AttachedItemUpdateParams build() {
-      return new AttachedItemUpdateParams(this);
-    }
-  }
-
-  public enum Type {
-    RECOMMENDED("recommended"),
-
-    MANDATORY("mandatory"),
-
-    OPTIONAL("optional"),
-
-    /** An enum member indicating that Type was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Type(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Type fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Type enumValue : Type.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChargeOnEvent {
-    SUBSCRIPTION_CREATION("subscription_creation"),
-
-    SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-    PLAN_ACTIVATION("plan_activation"),
-
-    SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-    CONTRACT_TERMINATION("contract_termination"),
-
-    ON_DEMAND("on_demand"),
-
-    /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChargeOnEvent(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChargeOnEvent fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/businessEntity/params/BusinessEntityCreateTransfersParams.java b/src/main/java/com/chargebee/v4/core/models/businessEntity/params/BusinessEntityCreateTransfersParams.java
deleted file mode 100644
index b6a707bc..00000000
--- a/src/main/java/com/chargebee/v4/core/models/businessEntity/params/BusinessEntityCreateTransfersParams.java
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.businessEntity.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class BusinessEntityCreateTransfersParams {
-
-  private final Map<String, Object> formData;
-
-  private BusinessEntityCreateTransfersParams(BusinessEntityCreateTransfersBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for BusinessEntityCreateTransfersParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static BusinessEntityCreateTransfersBuilder builder() {
-    return new BusinessEntityCreateTransfersBuilder();
-  }
-
-  public static final class BusinessEntityCreateTransfersBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private BusinessEntityCreateTransfersBuilder() {}
-
-    public BusinessEntityCreateTransfersBuilder activeResourceIds(List<String> value) {
-
-      formData.put("active_resource_ids", value);
-
-      return this;
-    }
-
-    public BusinessEntityCreateTransfersBuilder destinationBusinessEntityIds(List<String> value) {
-
-      formData.put("destination_business_entity_ids", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public BusinessEntityCreateTransfersBuilder sourceBusinessEntityIds(List<String> value) {
-
-      formData.put("source_business_entity_ids", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public BusinessEntityCreateTransfersBuilder resourceTypes(List<String> value) {
-
-      formData.put("resource_types", value);
-
-      return this;
-    }
-
-    public BusinessEntityCreateTransfersBuilder reasonCodes(List<String> value) {
-
-      formData.put("reason_codes", value);
-
-      return this;
-    }
-
-    public BusinessEntityCreateTransfersParams build() {
-      return new BusinessEntityCreateTransfersParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/businessEntityChange/BusinessEntityChange.java b/src/main/java/com/chargebee/v4/core/models/businessEntityChange/BusinessEntityChange.java
deleted file mode 100644
index 1bd107eb..00000000
--- a/src/main/java/com/chargebee/v4/core/models/businessEntityChange/BusinessEntityChange.java
+++ /dev/null
@@ -1,138 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.businessEntityChange;
-
-import com.chargebee.v4.internal.JsonUtil;
-import java.sql.Timestamp;
-
-public class BusinessEntityChange {
-
-  private String id;
-  private String businessEntityId;
-  private Reason reason;
-  private Timestamp activeFrom;
-  private Timestamp activeTo;
-  private ResourceType resourceType;
-  private Timestamp modifiedAt;
-  private String resourceId;
-  private String activeResourceId;
-
-  public String getId() {
-    return id;
-  }
-
-  public String getBusinessEntityId() {
-    return businessEntityId;
-  }
-
-  public Reason getReason() {
-    return reason;
-  }
-
-  public Timestamp getActiveFrom() {
-    return activeFrom;
-  }
-
-  public Timestamp getActiveTo() {
-    return activeTo;
-  }
-
-  public ResourceType getResourceType() {
-    return resourceType;
-  }
-
-  public Timestamp getModifiedAt() {
-    return modifiedAt;
-  }
-
-  public String getResourceId() {
-    return resourceId;
-  }
-
-  public String getActiveResourceId() {
-    return activeResourceId;
-  }
-
-  public enum Reason {
-    CORRECTION("correction"),
-
-    /** An enum member indicating that Reason was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Reason(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Reason fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Reason enumValue : Reason.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ResourceType {
-    CUSTOMER("customer"),
-
-    SUBSCRIPTION("subscription"),
-
-    /** An enum member indicating that ResourceType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ResourceType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ResourceType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ResourceType enumValue : ResourceType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static BusinessEntityChange fromJson(String json) {
-    BusinessEntityChange obj = new BusinessEntityChange();
-
-    obj.id = JsonUtil.getString(json, "id");
-
-    obj.businessEntityId = JsonUtil.getString(json, "business_entity_id");
-
-    obj.reason = Reason.fromString(JsonUtil.getString(json, "reason"));
-
-    obj.activeFrom = JsonUtil.getTimestamp(json, "active_from");
-
-    obj.activeTo = JsonUtil.getTimestamp(json, "active_to");
-
-    obj.resourceType = ResourceType.fromString(JsonUtil.getString(json, "resource_type"));
-
-    obj.modifiedAt = JsonUtil.getTimestamp(json, "modified_at");
-
-    obj.resourceId = JsonUtil.getString(json, "resource_id");
-
-    obj.activeResourceId = JsonUtil.getString(json, "active_resource_id");
-
-    return obj;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/card/params/CardCopyCardForCustomerParams.java b/src/main/java/com/chargebee/v4/core/models/card/params/CardCopyCardForCustomerParams.java
deleted file mode 100644
index ea47d8a8..00000000
--- a/src/main/java/com/chargebee/v4/core/models/card/params/CardCopyCardForCustomerParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.card.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CardCopyCardForCustomerParams {
-
-  private final Map<String, Object> formData;
-
-  private CardCopyCardForCustomerParams(CardCopyCardForCustomerBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CardCopyCardForCustomerParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CardCopyCardForCustomerBuilder builder() {
-    return new CardCopyCardForCustomerBuilder();
-  }
-
-  public static final class CardCopyCardForCustomerBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CardCopyCardForCustomerBuilder() {}
-
-    public CardCopyCardForCustomerBuilder gatewayAccountId(String value) {
-
-      formData.put("gateway_account_id", value);
-
-      return this;
-    }
-
-    public CardCopyCardForCustomerParams build() {
-      return new CardCopyCardForCustomerParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/card/params/CardDeleteCardForCustomerParams.java b/src/main/java/com/chargebee/v4/core/models/card/params/CardDeleteCardForCustomerParams.java
deleted file mode 100644
index c62879f8..00000000
--- a/src/main/java/com/chargebee/v4/core/models/card/params/CardDeleteCardForCustomerParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.card.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CardDeleteCardForCustomerParams {
-
-  private final Map<String, Object> formData;
-
-  private CardDeleteCardForCustomerParams(CardDeleteCardForCustomerBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CardDeleteCardForCustomerParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CardDeleteCardForCustomerBuilder builder() {
-    return new CardDeleteCardForCustomerBuilder();
-  }
-
-  public static final class CardDeleteCardForCustomerBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CardDeleteCardForCustomerBuilder() {}
-
-    public CardDeleteCardForCustomerParams build() {
-      return new CardDeleteCardForCustomerParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/card/params/CardUpdateCardForCustomerParams.java b/src/main/java/com/chargebee/v4/core/models/card/params/CardUpdateCardForCustomerParams.java
deleted file mode 100644
index 434df683..00000000
--- a/src/main/java/com/chargebee/v4/core/models/card/params/CardUpdateCardForCustomerParams.java
+++ /dev/null
@@ -1,383 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.card.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CardUpdateCardForCustomerParams {
-
-  private final Map<String, Object> formData;
-
-  private CardUpdateCardForCustomerParams(CardUpdateCardForCustomerBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CardUpdateCardForCustomerParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CardUpdateCardForCustomerBuilder builder() {
-    return new CardUpdateCardForCustomerBuilder();
-  }
-
-  public static final class CardUpdateCardForCustomerBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CardUpdateCardForCustomerBuilder() {}
-
-    @Deprecated
-    public CardUpdateCardForCustomerBuilder gateway(Gateway value) {
-
-      formData.put("gateway", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder gatewayAccountId(String value) {
-
-      formData.put("gateway_account_id", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder tmpToken(String value) {
-
-      formData.put("tmp_token", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder firstName(String value) {
-
-      formData.put("first_name", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder lastName(String value) {
-
-      formData.put("last_name", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder number(String value) {
-
-      formData.put("number", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder expiryMonth(Integer value) {
-
-      formData.put("expiry_month", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder expiryYear(Integer value) {
-
-      formData.put("expiry_year", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder cvv(String value) {
-
-      formData.put("cvv", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder preferredScheme(PreferredScheme value) {
-
-      formData.put("preferred_scheme", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder billingAddr1(String value) {
-
-      formData.put("billing_addr1", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder billingAddr2(String value) {
-
-      formData.put("billing_addr2", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder billingCity(String value) {
-
-      formData.put("billing_city", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder billingStateCode(String value) {
-
-      formData.put("billing_state_code", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder billingState(String value) {
-
-      formData.put("billing_state", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder billingZip(String value) {
-
-      formData.put("billing_zip", value);
-
-      return this;
-    }
-
-    public CardUpdateCardForCustomerBuilder billingCountry(String value) {
-
-      formData.put("billing_country", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public CardUpdateCardForCustomerBuilder ipAddress(String value) {
-
-      formData.put("ip_address", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public CardUpdateCardForCustomerBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CardUpdateCardForCustomerParams build() {
-      return new CardUpdateCardForCustomerParams(this);
-    }
-  }
-
-  public enum Gateway {
-    CHARGEBEE("chargebee"),
-
-    CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-    ADYEN("adyen"),
-
-    STRIPE("stripe"),
-
-    WEPAY("wepay"),
-
-    BRAINTREE("braintree"),
-
-    AUTHORIZE_NET("authorize_net"),
-
-    PAYPAL_PRO("paypal_pro"),
-
-    PIN("pin"),
-
-    EWAY("eway"),
-
-    EWAY_RAPID("eway_rapid"),
-
-    WORLDPAY("worldpay"),
-
-    BALANCED_PAYMENTS("balanced_payments"),
-
-    BEANSTREAM("beanstream"),
-
-    BLUEPAY("bluepay"),
-
-    ELAVON("elavon"),
-
-    FIRST_DATA_GLOBAL("first_data_global"),
-
-    HDFC("hdfc"),
-
-    MIGS("migs"),
-
-    NMI("nmi"),
-
-    OGONE("ogone"),
-
-    PAYMILL("paymill"),
-
-    PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-    SAGE_PAY("sage_pay"),
-
-    TCO("tco"),
-
-    WIRECARD("wirecard"),
-
-    AMAZON_PAYMENTS("amazon_payments"),
-
-    PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-    ORBITAL("orbital"),
-
-    MONERIS_US("moneris_us"),
-
-    MONERIS("moneris"),
-
-    BLUESNAP("bluesnap"),
-
-    CYBERSOURCE("cybersource"),
-
-    VANTIV("vantiv"),
-
-    CHECKOUT_COM("checkout_com"),
-
-    PAYPAL("paypal"),
-
-    INGENICO_DIRECT("ingenico_direct"),
-
-    EXACT("exact"),
-
-    MOLLIE("mollie"),
-
-    QUICKBOOKS("quickbooks"),
-
-    RAZORPAY("razorpay"),
-
-    GLOBAL_PAYMENTS("global_payments"),
-
-    BANK_OF_AMERICA("bank_of_america"),
-
-    ECENTRIC("ecentric"),
-
-    METRICS_GLOBAL("metrics_global"),
-
-    WINDCAVE("windcave"),
-
-    PAY_COM("pay_com"),
-
-    EBANX("ebanx"),
-
-    DLOCAL("dlocal"),
-
-    NUVEI("nuvei"),
-
-    SOLIDGATE("solidgate"),
-
-    PAYSTACK("paystack"),
-
-    JP_MORGAN("jp_morgan"),
-
-    DEUTSCHE_BANK("deutsche_bank"),
-
-    /** An enum member indicating that Gateway was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Gateway(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Gateway fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Gateway enumValue : Gateway.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PreferredScheme {
-    CARTES_BANCAIRES("cartes_bancaires"),
-
-    MASTERCARD("mastercard"),
-
-    VISA("visa"),
-
-    /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PreferredScheme(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PreferredScheme fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PreferredScheme enumValue : PreferredScheme.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      @Deprecated
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/comment/params/CommentCreateParams.java b/src/main/java/com/chargebee/v4/core/models/comment/params/CommentCreateParams.java
deleted file mode 100644
index ebddd9d2..00000000
--- a/src/main/java/com/chargebee/v4/core/models/comment/params/CommentCreateParams.java
+++ /dev/null
@@ -1,125 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.comment.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CommentCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private CommentCreateParams(CommentCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CommentCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CommentCreateBuilder builder() {
-    return new CommentCreateBuilder();
-  }
-
-  public static final class CommentCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CommentCreateBuilder() {}
-
-    public CommentCreateBuilder entityType(EntityType value) {
-
-      formData.put("entity_type", value);
-
-      return this;
-    }
-
-    public CommentCreateBuilder entityId(String value) {
-
-      formData.put("entity_id", value);
-
-      return this;
-    }
-
-    public CommentCreateBuilder notes(String value) {
-
-      formData.put("notes", value);
-
-      return this;
-    }
-
-    public CommentCreateBuilder addedBy(String value) {
-
-      formData.put("added_by", value);
-
-      return this;
-    }
-
-    public CommentCreateParams build() {
-      return new CommentCreateParams(this);
-    }
-  }
-
-  public enum EntityType {
-    CUSTOMER("customer"),
-
-    SUBSCRIPTION("subscription"),
-
-    INVOICE("invoice"),
-
-    QUOTE("quote"),
-
-    CREDIT_NOTE("credit_note"),
-
-    TRANSACTION("transaction"),
-
-    PLAN("plan"),
-
-    ADDON("addon"),
-
-    COUPON("coupon"),
-
-    ORDER("order"),
-
-    BUSINESS_ENTITY("business_entity"),
-
-    ITEM_FAMILY("item_family"),
-
-    ITEM("item"),
-
-    ITEM_PRICE("item_price"),
-
-    PRICE_VARIANT("price_variant"),
-
-    /** An enum member indicating that EntityType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    EntityType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static EntityType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (EntityType enumValue : EntityType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/comment/params/CommentDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/comment/params/CommentDeleteParams.java
deleted file mode 100644
index b27269df..00000000
--- a/src/main/java/com/chargebee/v4/core/models/comment/params/CommentDeleteParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.comment.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CommentDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private CommentDeleteParams(CommentDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CommentDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CommentDeleteBuilder builder() {
-    return new CommentDeleteBuilder();
-  }
-
-  public static final class CommentDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CommentDeleteBuilder() {}
-
-    public CommentDeleteParams build() {
-      return new CommentDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponCopyParams.java b/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponCopyParams.java
deleted file mode 100644
index 095c48f7..00000000
--- a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponCopyParams.java
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.coupon.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CouponCopyParams {
-
-  private final Map<String, Object> formData;
-
-  private CouponCopyParams(CouponCopyBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CouponCopyParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CouponCopyBuilder builder() {
-    return new CouponCopyBuilder();
-  }
-
-  public static final class CouponCopyBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CouponCopyBuilder() {}
-
-    public CouponCopyBuilder fromSite(String value) {
-
-      formData.put("from_site", value);
-
-      return this;
-    }
-
-    public CouponCopyBuilder idAtFromSite(String value) {
-
-      formData.put("id_at_from_site", value);
-
-      return this;
-    }
-
-    public CouponCopyBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public CouponCopyBuilder forSiteMerging(Boolean value) {
-
-      formData.put("for_site_merging", value);
-
-      return this;
-    }
-
-    public CouponCopyParams build() {
-      return new CouponCopyParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponCreateForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponCreateForItemsParams.java
deleted file mode 100644
index 4976e4f7..00000000
--- a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponCreateForItemsParams.java
+++ /dev/null
@@ -1,733 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.coupon.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class CouponCreateForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private CouponCreateForItemsParams(CouponCreateForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CouponCreateForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CouponCreateForItemsBuilder builder() {
-    return new CouponCreateForItemsBuilder();
-  }
-
-  public static final class CouponCreateForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CouponCreateForItemsBuilder() {}
-
-    public CouponCreateForItemsBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder invoiceName(String value) {
-
-      formData.put("invoice_name", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder discountType(DiscountType value) {
-
-      formData.put("discount_type", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder discountAmount(Long value) {
-
-      formData.put("discount_amount", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder discountPercentage(Number value) {
-
-      formData.put("discount_percentage", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder discountQuantity(Integer value) {
-
-      formData.put("discount_quantity", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder applyOn(ApplyOn value) {
-
-      formData.put("apply_on", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder durationType(DurationType value) {
-
-      formData.put("duration_type", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder durationMonth(Integer value) {
-
-      formData.put("duration_month", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder validFrom(Timestamp value) {
-
-      formData.put("valid_from", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder validTill(Timestamp value) {
-
-      formData.put("valid_till", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder maxRedemptions(Integer value) {
-
-      formData.put("max_redemptions", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder includedInMrr(Boolean value) {
-
-      formData.put("included_in_mrr", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder period(Integer value) {
-
-      formData.put("period", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder periodUnit(PeriodUnit value) {
-
-      formData.put("period_unit", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder itemConstraints(List<ItemConstraintsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemConstraintsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_constraints[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder itemConstraintCriteria(
-        List<ItemConstraintCriteriaParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemConstraintCriteriaParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_constraint_criteria[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public CouponCreateForItemsBuilder couponConstraints(List<CouponConstraintsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponConstraintsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupon_constraints[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public CouponCreateForItemsBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public CouponCreateForItemsBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CouponCreateForItemsParams build() {
-      return new CouponCreateForItemsParams(this);
-    }
-  }
-
-  public enum DiscountType {
-    FIXED_AMOUNT("fixed_amount"),
-
-    PERCENTAGE("percentage"),
-
-    OFFER_QUANTITY("offer_quantity"),
-
-    /** An enum member indicating that DiscountType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    DiscountType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static DiscountType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (DiscountType enumValue : DiscountType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ApplyOn {
-    INVOICE_AMOUNT("invoice_amount"),
-
-    SPECIFIED_ITEMS_TOTAL("specified_items_total"),
-
-    EACH_SPECIFIED_ITEM("each_specified_item"),
-
-    EACH_UNIT_OF_SPECIFIED_ITEMS("each_unit_of_specified_items"),
-
-    /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ApplyOn(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ApplyOn fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ApplyOn enumValue : ApplyOn.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum DurationType {
-    ONE_TIME("one_time"),
-
-    FOREVER("forever"),
-
-    LIMITED_PERIOD("limited_period"),
-
-    /** An enum member indicating that DurationType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    DurationType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static DurationType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (DurationType enumValue : DurationType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PeriodUnit enumValue : PeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Status {
-    ACTIVE("active"),
-
-    ARCHIVED("archived"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ItemConstraintsParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemConstraintsParams(ItemConstraintsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemConstraintsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemConstraintsBuilder builder() {
-      return new ItemConstraintsBuilder();
-    }
-
-    public static final class ItemConstraintsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemConstraintsBuilder() {}
-
-      public ItemConstraintsBuilder constraint(Constraint value) {
-
-        formData.put("constraint", value);
-
-        return this;
-      }
-
-      public ItemConstraintsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public ItemConstraintsBuilder itemPriceIds(List<Object> value) {
-
-        formData.put("item_price_ids", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public ItemConstraintsParams build() {
-        return new ItemConstraintsParams(this);
-      }
-    }
-
-    public enum Constraint {
-      NONE("none"),
-
-      ALL("all"),
-
-      SPECIFIC("specific"),
-
-      CRITERIA("criteria"),
-
-      /** An enum member indicating that Constraint was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Constraint(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Constraint fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Constraint enumValue : Constraint.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemConstraintCriteriaParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemConstraintCriteriaParams(ItemConstraintCriteriaBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemConstraintCriteriaParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemConstraintCriteriaBuilder builder() {
-      return new ItemConstraintCriteriaBuilder();
-    }
-
-    public static final class ItemConstraintCriteriaBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemConstraintCriteriaBuilder() {}
-
-      public ItemConstraintCriteriaBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public ItemConstraintCriteriaBuilder itemFamilyIds(List<Object> value) {
-
-        formData.put("item_family_ids", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public ItemConstraintCriteriaBuilder currencies(List<Object> value) {
-
-        formData.put("currencies", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public ItemConstraintCriteriaBuilder itemPricePeriods(List<Object> value) {
-
-        formData.put("item_price_periods", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public ItemConstraintCriteriaParams build() {
-        return new ItemConstraintCriteriaParams(this);
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponConstraintsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponConstraintsParams(CouponConstraintsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponConstraintsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponConstraintsBuilder builder() {
-      return new CouponConstraintsBuilder();
-    }
-
-    public static final class CouponConstraintsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponConstraintsBuilder() {}
-
-      public CouponConstraintsBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public CouponConstraintsBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      public CouponConstraintsBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public CouponConstraintsParams build() {
-        return new CouponConstraintsParams(this);
-      }
-    }
-
-    public enum EntityType {
-      CUSTOMER("customer"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum Type {
-      MAX_REDEMPTIONS("max_redemptions"),
-
-      UNIQUE_BY("unique_by"),
-
-      EXISTING_CUSTOMER("existing_customer"),
-
-      NEW_CUSTOMER("new_customer"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponCreateParams.java b/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponCreateParams.java
deleted file mode 100644
index fe21b648..00000000
--- a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponCreateParams.java
+++ /dev/null
@@ -1,419 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.coupon.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class CouponCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private CouponCreateParams(CouponCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CouponCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CouponCreateBuilder builder() {
-    return new CouponCreateBuilder();
-  }
-
-  public static final class CouponCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CouponCreateBuilder() {}
-
-    public CouponCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder invoiceName(String value) {
-
-      formData.put("invoice_name", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder discountType(DiscountType value) {
-
-      formData.put("discount_type", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder discountAmount(Long value) {
-
-      formData.put("discount_amount", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder discountPercentage(Number value) {
-
-      formData.put("discount_percentage", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder discountQuantity(Integer value) {
-
-      formData.put("discount_quantity", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder applyOn(ApplyOn value) {
-
-      formData.put("apply_on", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder durationType(DurationType value) {
-
-      formData.put("duration_type", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder durationMonth(Integer value) {
-
-      formData.put("duration_month", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder validTill(Timestamp value) {
-
-      formData.put("valid_till", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder maxRedemptions(Integer value) {
-
-      formData.put("max_redemptions", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public CouponCreateBuilder includedInMrr(Boolean value) {
-
-      formData.put("included_in_mrr", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder period(Integer value) {
-
-      formData.put("period", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder periodUnit(PeriodUnit value) {
-
-      formData.put("period_unit", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder planConstraint(PlanConstraint value) {
-
-      formData.put("plan_constraint", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder addonConstraint(AddonConstraint value) {
-
-      formData.put("addon_constraint", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder planIds(List<String> value) {
-
-      formData.put("plan_ids", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder addonIds(List<String> value) {
-
-      formData.put("addon_ids", value);
-
-      return this;
-    }
-
-    public CouponCreateBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public CouponCreateParams build() {
-      return new CouponCreateParams(this);
-    }
-  }
-
-  public enum DiscountType {
-    FIXED_AMOUNT("fixed_amount"),
-
-    PERCENTAGE("percentage"),
-
-    OFFER_QUANTITY("offer_quantity"),
-
-    /** An enum member indicating that DiscountType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    DiscountType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static DiscountType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (DiscountType enumValue : DiscountType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ApplyOn {
-    INVOICE_AMOUNT("invoice_amount"),
-
-    SPECIFIED_ITEMS_TOTAL("specified_items_total"),
-
-    EACH_SPECIFIED_ITEM("each_specified_item"),
-
-    EACH_UNIT_OF_SPECIFIED_ITEMS("each_unit_of_specified_items"),
-
-    /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ApplyOn(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ApplyOn fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ApplyOn enumValue : ApplyOn.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum DurationType {
-    ONE_TIME("one_time"),
-
-    FOREVER("forever"),
-
-    LIMITED_PERIOD("limited_period"),
-
-    /** An enum member indicating that DurationType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    DurationType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static DurationType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (DurationType enumValue : DurationType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PeriodUnit enumValue : PeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PlanConstraint {
-    NONE("none"),
-
-    ALL("all"),
-
-    SPECIFIC("specific"),
-
-    /** An enum member indicating that PlanConstraint was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PlanConstraint(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PlanConstraint fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PlanConstraint enumValue : PlanConstraint.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AddonConstraint {
-    NONE("none"),
-
-    ALL("all"),
-
-    SPECIFIC("specific"),
-
-    /** An enum member indicating that AddonConstraint was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AddonConstraint(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AddonConstraint fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AddonConstraint enumValue : AddonConstraint.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Status {
-    ACTIVE("active"),
-
-    ARCHIVED("archived"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponDeleteParams.java
deleted file mode 100644
index 5434b6a8..00000000
--- a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponDeleteParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.coupon.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CouponDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private CouponDeleteParams(CouponDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CouponDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CouponDeleteBuilder builder() {
-    return new CouponDeleteBuilder();
-  }
-
-  public static final class CouponDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CouponDeleteBuilder() {}
-
-    public CouponDeleteParams build() {
-      return new CouponDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponUpdateForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponUpdateForItemsParams.java
deleted file mode 100644
index c0a5a550..00000000
--- a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponUpdateForItemsParams.java
+++ /dev/null
@@ -1,691 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.coupon.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class CouponUpdateForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private CouponUpdateForItemsParams(CouponUpdateForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CouponUpdateForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CouponUpdateForItemsBuilder builder() {
-    return new CouponUpdateForItemsBuilder();
-  }
-
-  public static final class CouponUpdateForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CouponUpdateForItemsBuilder() {}
-
-    public CouponUpdateForItemsBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder invoiceName(String value) {
-
-      formData.put("invoice_name", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder discountType(DiscountType value) {
-
-      formData.put("discount_type", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder discountAmount(Long value) {
-
-      formData.put("discount_amount", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder discountPercentage(Number value) {
-
-      formData.put("discount_percentage", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder discountQuantity(Integer value) {
-
-      formData.put("discount_quantity", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder applyOn(ApplyOn value) {
-
-      formData.put("apply_on", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder durationType(DurationType value) {
-
-      formData.put("duration_type", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder durationMonth(Integer value) {
-
-      formData.put("duration_month", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder validFrom(Timestamp value) {
-
-      formData.put("valid_from", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder validTill(Timestamp value) {
-
-      formData.put("valid_till", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder maxRedemptions(Integer value) {
-
-      formData.put("max_redemptions", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder includedInMrr(Boolean value) {
-
-      formData.put("included_in_mrr", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder period(Integer value) {
-
-      formData.put("period", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder periodUnit(PeriodUnit value) {
-
-      formData.put("period_unit", value);
-
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder itemConstraints(List<ItemConstraintsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemConstraintsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_constraints[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder itemConstraintCriteria(
-        List<ItemConstraintCriteriaParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemConstraintCriteriaParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_constraint_criteria[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public CouponUpdateForItemsBuilder couponConstraints(List<CouponConstraintsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponConstraintsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupon_constraints[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public CouponUpdateForItemsBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public CouponUpdateForItemsBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CouponUpdateForItemsParams build() {
-      return new CouponUpdateForItemsParams(this);
-    }
-  }
-
-  public enum DiscountType {
-    FIXED_AMOUNT("fixed_amount"),
-
-    PERCENTAGE("percentage"),
-
-    OFFER_QUANTITY("offer_quantity"),
-
-    /** An enum member indicating that DiscountType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    DiscountType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static DiscountType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (DiscountType enumValue : DiscountType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ApplyOn {
-    INVOICE_AMOUNT("invoice_amount"),
-
-    SPECIFIED_ITEMS_TOTAL("specified_items_total"),
-
-    EACH_SPECIFIED_ITEM("each_specified_item"),
-
-    EACH_UNIT_OF_SPECIFIED_ITEMS("each_unit_of_specified_items"),
-
-    /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ApplyOn(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ApplyOn fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ApplyOn enumValue : ApplyOn.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum DurationType {
-    ONE_TIME("one_time"),
-
-    FOREVER("forever"),
-
-    LIMITED_PERIOD("limited_period"),
-
-    /** An enum member indicating that DurationType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    DurationType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static DurationType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (DurationType enumValue : DurationType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PeriodUnit enumValue : PeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ItemConstraintsParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemConstraintsParams(ItemConstraintsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemConstraintsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemConstraintsBuilder builder() {
-      return new ItemConstraintsBuilder();
-    }
-
-    public static final class ItemConstraintsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemConstraintsBuilder() {}
-
-      public ItemConstraintsBuilder constraint(Constraint value) {
-
-        formData.put("constraint", value);
-
-        return this;
-      }
-
-      public ItemConstraintsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public ItemConstraintsBuilder itemPriceIds(List<Object> value) {
-
-        formData.put("item_price_ids", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public ItemConstraintsParams build() {
-        return new ItemConstraintsParams(this);
-      }
-    }
-
-    public enum Constraint {
-      NONE("none"),
-
-      ALL("all"),
-
-      SPECIFIC("specific"),
-
-      CRITERIA("criteria"),
-
-      /** An enum member indicating that Constraint was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Constraint(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Constraint fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Constraint enumValue : Constraint.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemConstraintCriteriaParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemConstraintCriteriaParams(ItemConstraintCriteriaBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemConstraintCriteriaParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemConstraintCriteriaBuilder builder() {
-      return new ItemConstraintCriteriaBuilder();
-    }
-
-    public static final class ItemConstraintCriteriaBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemConstraintCriteriaBuilder() {}
-
-      public ItemConstraintCriteriaBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public ItemConstraintCriteriaBuilder itemFamilyIds(List<Object> value) {
-
-        formData.put("item_family_ids", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public ItemConstraintCriteriaBuilder currencies(List<Object> value) {
-
-        formData.put("currencies", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public ItemConstraintCriteriaBuilder itemPricePeriods(List<Object> value) {
-
-        formData.put("item_price_periods", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public ItemConstraintCriteriaParams build() {
-        return new ItemConstraintCriteriaParams(this);
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponConstraintsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponConstraintsParams(CouponConstraintsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponConstraintsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponConstraintsBuilder builder() {
-      return new CouponConstraintsBuilder();
-    }
-
-    public static final class CouponConstraintsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponConstraintsBuilder() {}
-
-      public CouponConstraintsBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public CouponConstraintsBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      public CouponConstraintsBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public CouponConstraintsParams build() {
-        return new CouponConstraintsParams(this);
-      }
-    }
-
-    public enum EntityType {
-      CUSTOMER("customer"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum Type {
-      MAX_REDEMPTIONS("max_redemptions"),
-
-      UNIQUE_BY("unique_by"),
-
-      EXISTING_CUSTOMER("existing_customer"),
-
-      NEW_CUSTOMER("new_customer"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponUpdateParams.java
deleted file mode 100644
index 3874f98b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponUpdateParams.java
+++ /dev/null
@@ -1,377 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.coupon.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class CouponUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private CouponUpdateParams(CouponUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CouponUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CouponUpdateBuilder builder() {
-    return new CouponUpdateBuilder();
-  }
-
-  public static final class CouponUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CouponUpdateBuilder() {}
-
-    public CouponUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder invoiceName(String value) {
-
-      formData.put("invoice_name", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder discountType(DiscountType value) {
-
-      formData.put("discount_type", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder discountAmount(Long value) {
-
-      formData.put("discount_amount", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder discountPercentage(Number value) {
-
-      formData.put("discount_percentage", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder discountQuantity(Integer value) {
-
-      formData.put("discount_quantity", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder applyOn(ApplyOn value) {
-
-      formData.put("apply_on", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder durationType(DurationType value) {
-
-      formData.put("duration_type", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder durationMonth(Integer value) {
-
-      formData.put("duration_month", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder validTill(Timestamp value) {
-
-      formData.put("valid_till", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder maxRedemptions(Integer value) {
-
-      formData.put("max_redemptions", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public CouponUpdateBuilder includedInMrr(Boolean value) {
-
-      formData.put("included_in_mrr", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder period(Integer value) {
-
-      formData.put("period", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder periodUnit(PeriodUnit value) {
-
-      formData.put("period_unit", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder planConstraint(PlanConstraint value) {
-
-      formData.put("plan_constraint", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder addonConstraint(AddonConstraint value) {
-
-      formData.put("addon_constraint", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder planIds(List<String> value) {
-
-      formData.put("plan_ids", value);
-
-      return this;
-    }
-
-    public CouponUpdateBuilder addonIds(List<String> value) {
-
-      formData.put("addon_ids", value);
-
-      return this;
-    }
-
-    public CouponUpdateParams build() {
-      return new CouponUpdateParams(this);
-    }
-  }
-
-  public enum DiscountType {
-    FIXED_AMOUNT("fixed_amount"),
-
-    PERCENTAGE("percentage"),
-
-    OFFER_QUANTITY("offer_quantity"),
-
-    /** An enum member indicating that DiscountType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    DiscountType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static DiscountType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (DiscountType enumValue : DiscountType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ApplyOn {
-    INVOICE_AMOUNT("invoice_amount"),
-
-    SPECIFIED_ITEMS_TOTAL("specified_items_total"),
-
-    EACH_SPECIFIED_ITEM("each_specified_item"),
-
-    EACH_UNIT_OF_SPECIFIED_ITEMS("each_unit_of_specified_items"),
-
-    /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ApplyOn(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ApplyOn fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ApplyOn enumValue : ApplyOn.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum DurationType {
-    ONE_TIME("one_time"),
-
-    FOREVER("forever"),
-
-    LIMITED_PERIOD("limited_period"),
-
-    /** An enum member indicating that DurationType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    DurationType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static DurationType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (DurationType enumValue : DurationType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PeriodUnit enumValue : PeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PlanConstraint {
-    NONE("none"),
-
-    ALL("all"),
-
-    SPECIFIC("specific"),
-
-    /** An enum member indicating that PlanConstraint was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PlanConstraint(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PlanConstraint fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PlanConstraint enumValue : PlanConstraint.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AddonConstraint {
-    NONE("none"),
-
-    ALL("all"),
-
-    SPECIFIC("specific"),
-
-    /** An enum member indicating that AddonConstraint was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AddonConstraint(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AddonConstraint fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AddonConstraint enumValue : AddonConstraint.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/couponCode/params/CouponCodeCreateParams.java b/src/main/java/com/chargebee/v4/core/models/couponCode/params/CouponCodeCreateParams.java
deleted file mode 100644
index f82c52cd..00000000
--- a/src/main/java/com/chargebee/v4/core/models/couponCode/params/CouponCodeCreateParams.java
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.couponCode.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CouponCodeCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private CouponCodeCreateParams(CouponCodeCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CouponCodeCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CouponCodeCreateBuilder builder() {
-    return new CouponCodeCreateBuilder();
-  }
-
-  public static final class CouponCodeCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CouponCodeCreateBuilder() {}
-
-    public CouponCodeCreateBuilder couponId(String value) {
-
-      formData.put("coupon_id", value);
-
-      return this;
-    }
-
-    public CouponCodeCreateBuilder couponSetName(String value) {
-
-      formData.put("coupon_set_name", value);
-
-      return this;
-    }
-
-    public CouponCodeCreateBuilder code(String value) {
-
-      formData.put("code", value);
-
-      return this;
-    }
-
-    public CouponCodeCreateParams build() {
-      return new CouponCodeCreateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetCreateParams.java b/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetCreateParams.java
deleted file mode 100644
index 3f9300e5..00000000
--- a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetCreateParams.java
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.couponSet.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CouponSetCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private CouponSetCreateParams(CouponSetCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CouponSetCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CouponSetCreateBuilder builder() {
-    return new CouponSetCreateBuilder();
-  }
-
-  public static final class CouponSetCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CouponSetCreateBuilder() {}
-
-    public CouponSetCreateBuilder couponId(String value) {
-
-      formData.put("coupon_id", value);
-
-      return this;
-    }
-
-    public CouponSetCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public CouponSetCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public CouponSetCreateBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public CouponSetCreateParams build() {
-      return new CouponSetCreateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetUpdateParams.java
deleted file mode 100644
index ec821a82..00000000
--- a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetUpdateParams.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.couponSet.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CouponSetUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private CouponSetUpdateParams(CouponSetUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CouponSetUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CouponSetUpdateBuilder builder() {
-    return new CouponSetUpdateBuilder();
-  }
-
-  public static final class CouponSetUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CouponSetUpdateBuilder() {}
-
-    public CouponSetUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public CouponSetUpdateBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public CouponSetUpdateParams build() {
-      return new CouponSetUpdateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteCreateParams.java b/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteCreateParams.java
deleted file mode 100644
index e8f16d55..00000000
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteCreateParams.java
+++ /dev/null
@@ -1,376 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.creditNote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class CreditNoteCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private CreditNoteCreateParams(CreditNoteCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CreditNoteCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CreditNoteCreateBuilder builder() {
-    return new CreditNoteCreateBuilder();
-  }
-
-  public static final class CreditNoteCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CreditNoteCreateBuilder() {}
-
-    public CreditNoteCreateBuilder referenceInvoiceId(String value) {
-
-      formData.put("reference_invoice_id", value);
-
-      return this;
-    }
-
-    public CreditNoteCreateBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public CreditNoteCreateBuilder total(Long value) {
-
-      formData.put("total", value);
-
-      return this;
-    }
-
-    public CreditNoteCreateBuilder type(Type value) {
-
-      formData.put("type", value);
-
-      return this;
-    }
-
-    public CreditNoteCreateBuilder reasonCode(ReasonCode value) {
-
-      formData.put("reason_code", value);
-
-      return this;
-    }
-
-    public CreditNoteCreateBuilder createReasonCode(String value) {
-
-      formData.put("create_reason_code", value);
-
-      return this;
-    }
-
-    public CreditNoteCreateBuilder date(Timestamp value) {
-
-      formData.put("date", value);
-
-      return this;
-    }
-
-    public CreditNoteCreateBuilder customerNotes(String value) {
-
-      formData.put("customer_notes", value);
-
-      return this;
-    }
-
-    public CreditNoteCreateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public CreditNoteCreateBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public CreditNoteCreateBuilder lineItems(List<LineItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          LineItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "line_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public CreditNoteCreateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public CreditNoteCreateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CreditNoteCreateParams build() {
-      return new CreditNoteCreateParams(this);
-    }
-  }
-
-  public enum Type {
-    ADJUSTMENT("adjustment"),
-
-    REFUNDABLE("refundable"),
-
-    STORE("store"),
-
-    /** An enum member indicating that Type was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Type(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Type fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Type enumValue : Type.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ReasonCode {
-    PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
-
-    SERVICE_UNSATISFACTORY("service_unsatisfactory"),
-
-    ORDER_CHANGE("order_change"),
-
-    ORDER_CANCELLATION("order_cancellation"),
-
-    WAIVER("waiver"),
-
-    OTHER("other"),
-
-    /** An enum member indicating that ReasonCode was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ReasonCode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ReasonCode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ReasonCode enumValue : ReasonCode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class LineItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private LineItemsParams(LineItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LineItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LineItemsBuilder builder() {
-      return new LineItemsBuilder();
-    }
-
-    public static final class LineItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LineItemsBuilder() {}
-
-      public LineItemsBuilder referenceLineItemId(String value) {
-
-        formData.put("reference_line_item_id", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder unitAmount(Long value) {
-
-        formData.put("unit_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder unitAmountInDecimal(String value) {
-
-        formData.put("unit_amount_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public LineItemsParams build() {
-        return new LineItemsParams(this);
-      }
-    }
-
-    public enum EntityType {
-      ADHOC("adhoc"),
-
-      PLAN_ITEM_PRICE("plan_item_price"),
-
-      ADDON_ITEM_PRICE("addon_item_price"),
-
-      CHARGE_ITEM_PRICE("charge_item_price"),
-
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteCreditNotesForCustomerParams.java b/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteCreditNotesForCustomerParams.java
deleted file mode 100644
index 7bb78e7a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteCreditNotesForCustomerParams.java
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.creditNote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CreditNoteCreditNotesForCustomerParams {
-
-  private final Map<String, Object> queryParams;
-
-  private CreditNoteCreditNotesForCustomerParams(CreditNoteCreditNotesForCustomerBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public CreditNoteCreditNotesForCustomerBuilder toBuilder() {
-    CreditNoteCreditNotesForCustomerBuilder builder = new CreditNoteCreditNotesForCustomerBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for CreditNoteCreditNotesForCustomerParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CreditNoteCreditNotesForCustomerBuilder builder() {
-    return new CreditNoteCreditNotesForCustomerBuilder();
-  }
-
-  public static final class CreditNoteCreditNotesForCustomerBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private CreditNoteCreditNotesForCustomerBuilder() {}
-
-    public CreditNoteCreditNotesForCustomerBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public CreditNoteCreditNotesForCustomerBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public CreditNoteCreditNotesForCustomerParams build() {
-      return new CreditNoteCreditNotesForCustomerParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteDeleteParams.java
deleted file mode 100644
index 165c0b06..00000000
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteDeleteParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.creditNote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CreditNoteDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private CreditNoteDeleteParams(CreditNoteDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CreditNoteDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CreditNoteDeleteBuilder builder() {
-    return new CreditNoteDeleteBuilder();
-  }
-
-  public static final class CreditNoteDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CreditNoteDeleteBuilder() {}
-
-    public CreditNoteDeleteBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public CreditNoteDeleteParams build() {
-      return new CreditNoteDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteImportCreditNoteParams.java b/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteImportCreditNoteParams.java
deleted file mode 100644
index 6d7b613c..00000000
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteImportCreditNoteParams.java
+++ /dev/null
@@ -1,1143 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.creditNote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class CreditNoteImportCreditNoteParams {
-
-  private final Map<String, Object> formData;
-
-  private CreditNoteImportCreditNoteParams(CreditNoteImportCreditNoteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CreditNoteImportCreditNoteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CreditNoteImportCreditNoteBuilder builder() {
-    return new CreditNoteImportCreditNoteBuilder();
-  }
-
-  public static final class CreditNoteImportCreditNoteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CreditNoteImportCreditNoteBuilder() {}
-
-    public CreditNoteImportCreditNoteBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder referenceInvoiceId(String value) {
-
-      formData.put("reference_invoice_id", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder type(Type value) {
-
-      formData.put("type", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder createReasonCode(String value) {
-
-      formData.put("create_reason_code", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder date(Timestamp value) {
-
-      formData.put("date", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder total(Long value) {
-
-      formData.put("total", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder refundedAt(Timestamp value) {
-
-      formData.put("refunded_at", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder voidedAt(Timestamp value) {
-
-      formData.put("voided_at", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder subTotal(Long value) {
-
-      formData.put("sub_total", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder roundOffAmount(Long value) {
-
-      formData.put("round_off_amount", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder fractionalCorrection(Long value) {
-
-      formData.put("fractional_correction", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder vatNumberPrefix(String value) {
-
-      formData.put("vat_number_prefix", value);
-
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder lineItems(List<LineItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          LineItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "line_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder lineItemTiers(List<LineItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          LineItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "line_item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder taxes(List<TaxesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "taxes[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder allocations(List<AllocationsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AllocationsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "allocations[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteBuilder linkedRefunds(List<LinkedRefundsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          LinkedRefundsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "linked_refunds[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public CreditNoteImportCreditNoteBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public CreditNoteImportCreditNoteBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteParams build() {
-      return new CreditNoteImportCreditNoteParams(this);
-    }
-  }
-
-  public enum Type {
-    ADJUSTMENT("adjustment"),
-
-    REFUNDABLE("refundable"),
-
-    STORE("store"),
-
-    /** An enum member indicating that Type was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Type(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Type fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Type enumValue : Type.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Status {
-    ADJUSTED("adjusted"),
-
-    REFUNDED("refunded"),
-
-    REFUND_DUE("refund_due"),
-
-    VOIDED("voided"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class LineItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private LineItemsParams(LineItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LineItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LineItemsBuilder builder() {
-      return new LineItemsBuilder();
-    }
-
-    public static final class LineItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LineItemsBuilder() {}
-
-      public LineItemsBuilder referenceLineItemId(String value) {
-
-        formData.put("reference_line_item_id", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder subscriptionId(String value) {
-
-        formData.put("subscription_id", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder unitAmount(Long value) {
-
-        formData.put("unit_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder unitAmountInDecimal(String value) {
-
-        formData.put("unit_amount_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder itemLevelDiscount1EntityId(String value) {
-
-        formData.put("item_level_discount1_entity_id", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder itemLevelDiscount1Amount(Long value) {
-
-        formData.put("item_level_discount1_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder itemLevelDiscount2EntityId(String value) {
-
-        formData.put("item_level_discount2_entity_id", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder itemLevelDiscount2Amount(Long value) {
-
-        formData.put("item_level_discount2_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax1Name(String value) {
-
-        formData.put("tax1_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax1Amount(Long value) {
-
-        formData.put("tax1_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax2Name(String value) {
-
-        formData.put("tax2_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax2Amount(Long value) {
-
-        formData.put("tax2_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax3Name(String value) {
-
-        formData.put("tax3_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax3Amount(Long value) {
-
-        formData.put("tax3_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax4Name(String value) {
-
-        formData.put("tax4_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax4Amount(Long value) {
-
-        formData.put("tax4_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax5Name(String value) {
-
-        formData.put("tax5_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax5Amount(Long value) {
-
-        formData.put("tax5_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax6Name(String value) {
-
-        formData.put("tax6_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax6Amount(Long value) {
-
-        formData.put("tax6_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax7Name(String value) {
-
-        formData.put("tax7_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax7Amount(Long value) {
-
-        formData.put("tax7_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax8Name(String value) {
-
-        formData.put("tax8_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax8Amount(Long value) {
-
-        formData.put("tax8_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax9Name(String value) {
-
-        formData.put("tax9_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax9Amount(Long value) {
-
-        formData.put("tax9_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax10Name(String value) {
-
-        formData.put("tax10_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax10Amount(Long value) {
-
-        formData.put("tax10_amount", value);
-
-        return this;
-      }
-
-      public LineItemsParams build() {
-        return new LineItemsParams(this);
-      }
-    }
-
-    public enum EntityType {
-      ADHOC("adhoc"),
-
-      PLAN_ITEM_PRICE("plan_item_price"),
-
-      ADDON_ITEM_PRICE("addon_item_price"),
-
-      CHARGE_ITEM_PRICE("charge_item_price"),
-
-      PLAN_SETUP("plan_setup"),
-
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class LineItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private LineItemTiersParams(LineItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LineItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LineItemTiersBuilder builder() {
-      return new LineItemTiersBuilder();
-    }
-
-    public static final class LineItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LineItemTiersBuilder() {}
-
-      public LineItemTiersBuilder lineItemId(String value) {
-
-        formData.put("line_item_id", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder quantityUsed(Integer value) {
-
-        formData.put("quantity_used", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder unitAmount(Long value) {
-
-        formData.put("unit_amount", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder quantityUsedInDecimal(String value) {
-
-        formData.put("quantity_used_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder unitAmountInDecimal(String value) {
-
-        formData.put("unit_amount_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemTiersParams build() {
-        return new LineItemTiersParams(this);
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum EntityType {
-      ITEM_LEVEL_COUPON("item_level_coupon"),
-
-      DOCUMENT_LEVEL_COUPON("document_level_coupon"),
-
-      PROMOTIONAL_CREDITS("promotional_credits"),
-
-      ITEM_LEVEL_DISCOUNT("item_level_discount"),
-
-      DOCUMENT_LEVEL_DISCOUNT("document_level_discount"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxesParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxesParams(TaxesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxesBuilder builder() {
-      return new TaxesBuilder();
-    }
-
-    public static final class TaxesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxesBuilder() {}
-
-      public TaxesBuilder name(String value) {
-
-        formData.put("name", value);
-
-        return this;
-      }
-
-      public TaxesBuilder rate(Number value) {
-
-        formData.put("rate", value);
-
-        return this;
-      }
-
-      public TaxesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public TaxesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public TaxesBuilder jurisType(JurisType value) {
-
-        formData.put("juris_type", value);
-
-        return this;
-      }
-
-      public TaxesBuilder jurisName(String value) {
-
-        formData.put("juris_name", value);
-
-        return this;
-      }
-
-      public TaxesBuilder jurisCode(String value) {
-
-        formData.put("juris_code", value);
-
-        return this;
-      }
-
-      public TaxesParams build() {
-        return new TaxesParams(this);
-      }
-    }
-
-    public enum JurisType {
-      COUNTRY("country"),
-
-      FEDERAL("federal"),
-
-      STATE("state"),
-
-      COUNTY("county"),
-
-      CITY("city"),
-
-      SPECIAL("special"),
-
-      UNINCORPORATED("unincorporated"),
-
-      OTHER("other"),
-
-      /** An enum member indicating that JurisType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      JurisType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static JurisType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (JurisType enumValue : JurisType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AllocationsParams {
-
-    private final Map<String, Object> formData;
-
-    private AllocationsParams(AllocationsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AllocationsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AllocationsBuilder builder() {
-      return new AllocationsBuilder();
-    }
-
-    public static final class AllocationsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AllocationsBuilder() {}
-
-      public AllocationsBuilder invoiceId(String value) {
-
-        formData.put("invoice_id", value);
-
-        return this;
-      }
-
-      public AllocationsBuilder allocatedAmount(Long value) {
-
-        formData.put("allocated_amount", value);
-
-        return this;
-      }
-
-      public AllocationsBuilder allocatedAt(Timestamp value) {
-
-        formData.put("allocated_at", value);
-
-        return this;
-      }
-
-      public AllocationsParams build() {
-        return new AllocationsParams(this);
-      }
-    }
-  }
-
-  public static final class LinkedRefundsParams {
-
-    private final Map<String, Object> formData;
-
-    private LinkedRefundsParams(LinkedRefundsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LinkedRefundsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LinkedRefundsBuilder builder() {
-      return new LinkedRefundsBuilder();
-    }
-
-    public static final class LinkedRefundsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LinkedRefundsBuilder() {}
-
-      public LinkedRefundsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public LinkedRefundsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public LinkedRefundsBuilder paymentMethod(PaymentMethod value) {
-
-        formData.put("payment_method", value);
-
-        return this;
-      }
-
-      public LinkedRefundsBuilder date(Timestamp value) {
-
-        formData.put("date", value);
-
-        return this;
-      }
-
-      public LinkedRefundsBuilder referenceNumber(String value) {
-
-        formData.put("reference_number", value);
-
-        return this;
-      }
-
-      public LinkedRefundsParams build() {
-        return new LinkedRefundsParams(this);
-      }
-    }
-
-    public enum PaymentMethod {
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      OTHER("other"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethod enumValue : PaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteRecordRefundParams.java b/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteRecordRefundParams.java
deleted file mode 100644
index de14d34b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteRecordRefundParams.java
+++ /dev/null
@@ -1,181 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.creditNote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class CreditNoteRecordRefundParams {
-
-  private final Map<String, Object> formData;
-
-  private CreditNoteRecordRefundParams(CreditNoteRecordRefundBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CreditNoteRecordRefundParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CreditNoteRecordRefundBuilder builder() {
-    return new CreditNoteRecordRefundBuilder();
-  }
-
-  public static final class CreditNoteRecordRefundBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CreditNoteRecordRefundBuilder() {}
-
-    public CreditNoteRecordRefundBuilder refundReasonCode(String value) {
-
-      formData.put("refund_reason_code", value);
-
-      return this;
-    }
-
-    public CreditNoteRecordRefundBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public CreditNoteRecordRefundBuilder transaction(TransactionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "transaction[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CreditNoteRecordRefundParams build() {
-      return new CreditNoteRecordRefundParams(this);
-    }
-  }
-
-  public static final class TransactionParams {
-
-    private final Map<String, Object> formData;
-
-    private TransactionParams(TransactionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TransactionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TransactionBuilder builder() {
-      return new TransactionBuilder();
-    }
-
-    public static final class TransactionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TransactionBuilder() {}
-
-      public TransactionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public TransactionBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public TransactionBuilder paymentMethod(PaymentMethod value) {
-
-        formData.put("payment_method", value);
-
-        return this;
-      }
-
-      public TransactionBuilder referenceNumber(String value) {
-
-        formData.put("reference_number", value);
-
-        return this;
-      }
-
-      public TransactionBuilder customPaymentMethodId(String value) {
-
-        formData.put("custom_payment_method_id", value);
-
-        return this;
-      }
-
-      public TransactionBuilder date(Timestamp value) {
-
-        formData.put("date", value);
-
-        return this;
-      }
-
-      public TransactionParams build() {
-        return new TransactionParams(this);
-      }
-    }
-
-    public enum PaymentMethod {
-      CASH("cash"),
-
-      CHECK("check"),
-
-      CHARGEBACK("chargeback"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      OTHER("other"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethod enumValue : PaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteRefundParams.java b/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteRefundParams.java
deleted file mode 100644
index ca1725bf..00000000
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteRefundParams.java
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.creditNote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CreditNoteRefundParams {
-
-  private final Map<String, Object> formData;
-
-  private CreditNoteRefundParams(CreditNoteRefundBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CreditNoteRefundParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CreditNoteRefundBuilder builder() {
-    return new CreditNoteRefundBuilder();
-  }
-
-  public static final class CreditNoteRefundBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CreditNoteRefundBuilder() {}
-
-    public CreditNoteRefundBuilder refundAmount(Long value) {
-
-      formData.put("refund_amount", value);
-
-      return this;
-    }
-
-    public CreditNoteRefundBuilder customerNotes(String value) {
-
-      formData.put("customer_notes", value);
-
-      return this;
-    }
-
-    public CreditNoteRefundBuilder refundReasonCode(String value) {
-
-      formData.put("refund_reason_code", value);
-
-      return this;
-    }
-
-    public CreditNoteRefundParams build() {
-      return new CreditNoteRefundParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteRemoveTaxWithheldRefundParams.java b/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteRemoveTaxWithheldRefundParams.java
deleted file mode 100644
index c0df981a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteRemoveTaxWithheldRefundParams.java
+++ /dev/null
@@ -1,92 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.creditNote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CreditNoteRemoveTaxWithheldRefundParams {
-
-  private final Map<String, Object> formData;
-
-  private CreditNoteRemoveTaxWithheldRefundParams(
-      CreditNoteRemoveTaxWithheldRefundBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CreditNoteRemoveTaxWithheldRefundParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CreditNoteRemoveTaxWithheldRefundBuilder builder() {
-    return new CreditNoteRemoveTaxWithheldRefundBuilder();
-  }
-
-  public static final class CreditNoteRemoveTaxWithheldRefundBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CreditNoteRemoveTaxWithheldRefundBuilder() {}
-
-    public CreditNoteRemoveTaxWithheldRefundBuilder taxWithheld(TaxWithheldParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "tax_withheld[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CreditNoteRemoveTaxWithheldRefundParams build() {
-      return new CreditNoteRemoveTaxWithheldRefundParams(this);
-    }
-  }
-
-  public static final class TaxWithheldParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxWithheldParams(TaxWithheldBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxWithheldParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxWithheldBuilder builder() {
-      return new TaxWithheldBuilder();
-    }
-
-    public static final class TaxWithheldBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxWithheldBuilder() {}
-
-      public TaxWithheldBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public TaxWithheldParams build() {
-        return new TaxWithheldParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteVoidCreditNoteParams.java b/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteVoidCreditNoteParams.java
deleted file mode 100644
index 94fd8a31..00000000
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteVoidCreditNoteParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.creditNote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CreditNoteVoidCreditNoteParams {
-
-  private final Map<String, Object> formData;
-
-  private CreditNoteVoidCreditNoteParams(CreditNoteVoidCreditNoteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CreditNoteVoidCreditNoteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CreditNoteVoidCreditNoteBuilder builder() {
-    return new CreditNoteVoidCreditNoteBuilder();
-  }
-
-  public static final class CreditNoteVoidCreditNoteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CreditNoteVoidCreditNoteBuilder() {}
-
-    public CreditNoteVoidCreditNoteBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public CreditNoteVoidCreditNoteParams build() {
-      return new CreditNoteVoidCreditNoteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/csvTaxRule/params/CsvTaxRuleCreateParams.java b/src/main/java/com/chargebee/v4/core/models/csvTaxRule/params/CsvTaxRuleCreateParams.java
deleted file mode 100644
index a7bce50b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/csvTaxRule/params/CsvTaxRuleCreateParams.java
+++ /dev/null
@@ -1,451 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.csvTaxRule.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class CsvTaxRuleCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private CsvTaxRuleCreateParams(CsvTaxRuleCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CsvTaxRuleCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CsvTaxRuleCreateBuilder builder() {
-    return new CsvTaxRuleCreateBuilder();
-  }
-
-  public static final class CsvTaxRuleCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CsvTaxRuleCreateBuilder() {}
-
-    public CsvTaxRuleCreateBuilder taxProfileName(String value) {
-
-      formData.put("tax_profile_name", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder country(String value) {
-
-      formData.put("country", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder state(String value) {
-
-      formData.put("state", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder zipCode(String value) {
-
-      formData.put("zip_code", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder zipCodeStart(Integer value) {
-
-      formData.put("zip_code_start", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder zipCodeEnd(Integer value) {
-
-      formData.put("zip_code_end", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax1Name(String value) {
-
-      formData.put("tax1_name", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax1Rate(Number value) {
-
-      formData.put("tax1_rate", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax1JurisType(Tax1JurisType value) {
-
-      formData.put("tax1_juris_type", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax1JurisName(String value) {
-
-      formData.put("tax1_juris_name", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax1JurisCode(String value) {
-
-      formData.put("tax1_juris_code", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax2Name(String value) {
-
-      formData.put("tax2_name", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax2Rate(Number value) {
-
-      formData.put("tax2_rate", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax2JurisType(Tax2JurisType value) {
-
-      formData.put("tax2_juris_type", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax2JurisName(String value) {
-
-      formData.put("tax2_juris_name", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax2JurisCode(String value) {
-
-      formData.put("tax2_juris_code", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax3Name(String value) {
-
-      formData.put("tax3_name", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax3Rate(Number value) {
-
-      formData.put("tax3_rate", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax3JurisType(Tax3JurisType value) {
-
-      formData.put("tax3_juris_type", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax3JurisName(String value) {
-
-      formData.put("tax3_juris_name", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax3JurisCode(String value) {
-
-      formData.put("tax3_juris_code", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax4Name(String value) {
-
-      formData.put("tax4_name", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax4Rate(Number value) {
-
-      formData.put("tax4_rate", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax4JurisType(Tax4JurisType value) {
-
-      formData.put("tax4_juris_type", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax4JurisName(String value) {
-
-      formData.put("tax4_juris_name", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder tax4JurisCode(String value) {
-
-      formData.put("tax4_juris_code", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder serviceType(ServiceType value) {
-
-      formData.put("service_type", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder timeZone(String value) {
-
-      formData.put("time_zone", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder validFrom(Timestamp value) {
-
-      formData.put("valid_from", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder validTill(Timestamp value) {
-
-      formData.put("valid_till", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateBuilder overwrite(Boolean value) {
-
-      formData.put("overwrite", value);
-
-      return this;
-    }
-
-    public CsvTaxRuleCreateParams build() {
-      return new CsvTaxRuleCreateParams(this);
-    }
-  }
-
-  public enum Tax1JurisType {
-    COUNTRY("country"),
-
-    FEDERAL("federal"),
-
-    STATE("state"),
-
-    COUNTY("county"),
-
-    CITY("city"),
-
-    SPECIAL("special"),
-
-    UNINCORPORATED("unincorporated"),
-
-    OTHER("other"),
-
-    /** An enum member indicating that Tax1JurisType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Tax1JurisType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Tax1JurisType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Tax1JurisType enumValue : Tax1JurisType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Tax2JurisType {
-    COUNTRY("country"),
-
-    FEDERAL("federal"),
-
-    STATE("state"),
-
-    COUNTY("county"),
-
-    CITY("city"),
-
-    SPECIAL("special"),
-
-    UNINCORPORATED("unincorporated"),
-
-    OTHER("other"),
-
-    /** An enum member indicating that Tax2JurisType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Tax2JurisType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Tax2JurisType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Tax2JurisType enumValue : Tax2JurisType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Tax3JurisType {
-    COUNTRY("country"),
-
-    FEDERAL("federal"),
-
-    STATE("state"),
-
-    COUNTY("county"),
-
-    CITY("city"),
-
-    SPECIAL("special"),
-
-    UNINCORPORATED("unincorporated"),
-
-    OTHER("other"),
-
-    /** An enum member indicating that Tax3JurisType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Tax3JurisType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Tax3JurisType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Tax3JurisType enumValue : Tax3JurisType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Tax4JurisType {
-    COUNTRY("country"),
-
-    FEDERAL("federal"),
-
-    STATE("state"),
-
-    COUNTY("county"),
-
-    CITY("city"),
-
-    SPECIAL("special"),
-
-    UNINCORPORATED("unincorporated"),
-
-    OTHER("other"),
-
-    /** An enum member indicating that Tax4JurisType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Tax4JurisType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Tax4JurisType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Tax4JurisType enumValue : Tax4JurisType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ServiceType {
-    DIGITAL("digital"),
-
-    OTHER("other"),
-
-    NOT_APPLICABLE("not_applicable"),
-
-    /** An enum member indicating that ServiceType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ServiceType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ServiceType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ServiceType enumValue : ServiceType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyAddScheduleParams.java b/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyAddScheduleParams.java
deleted file mode 100644
index 44e9d325..00000000
--- a/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyAddScheduleParams.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.currency.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class CurrencyAddScheduleParams {
-
-  private final Map<String, Object> formData;
-
-  private CurrencyAddScheduleParams(CurrencyAddScheduleBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CurrencyAddScheduleParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CurrencyAddScheduleBuilder builder() {
-    return new CurrencyAddScheduleBuilder();
-  }
-
-  public static final class CurrencyAddScheduleBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CurrencyAddScheduleBuilder() {}
-
-    public CurrencyAddScheduleBuilder manualExchangeRate(String value) {
-
-      formData.put("manual_exchange_rate", value);
-
-      return this;
-    }
-
-    public CurrencyAddScheduleBuilder scheduleAt(Timestamp value) {
-
-      formData.put("schedule_at", value);
-
-      return this;
-    }
-
-    public CurrencyAddScheduleParams build() {
-      return new CurrencyAddScheduleParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyCreateParams.java b/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyCreateParams.java
deleted file mode 100644
index 4257f141..00000000
--- a/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyCreateParams.java
+++ /dev/null
@@ -1,92 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.currency.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CurrencyCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private CurrencyCreateParams(CurrencyCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CurrencyCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CurrencyCreateBuilder builder() {
-    return new CurrencyCreateBuilder();
-  }
-
-  public static final class CurrencyCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CurrencyCreateBuilder() {}
-
-    public CurrencyCreateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public CurrencyCreateBuilder forexType(ForexType value) {
-
-      formData.put("forex_type", value);
-
-      return this;
-    }
-
-    public CurrencyCreateBuilder manualExchangeRate(String value) {
-
-      formData.put("manual_exchange_rate", value);
-
-      return this;
-    }
-
-    public CurrencyCreateParams build() {
-      return new CurrencyCreateParams(this);
-    }
-  }
-
-  public enum ForexType {
-    MANUAL("manual"),
-
-    AUTO("auto"),
-
-    /** An enum member indicating that ForexType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ForexType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ForexType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ForexType enumValue : ForexType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyUpdateParams.java
deleted file mode 100644
index 498a313e..00000000
--- a/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyUpdateParams.java
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.currency.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CurrencyUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private CurrencyUpdateParams(CurrencyUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CurrencyUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CurrencyUpdateBuilder builder() {
-    return new CurrencyUpdateBuilder();
-  }
-
-  public static final class CurrencyUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CurrencyUpdateBuilder() {}
-
-    public CurrencyUpdateBuilder forexType(ForexType value) {
-
-      formData.put("forex_type", value);
-
-      return this;
-    }
-
-    public CurrencyUpdateBuilder manualExchangeRate(String value) {
-
-      formData.put("manual_exchange_rate", value);
-
-      return this;
-    }
-
-    public CurrencyUpdateParams build() {
-      return new CurrencyUpdateParams(this);
-    }
-  }
-
-  public enum ForexType {
-    MANUAL("manual"),
-
-    AUTO("auto"),
-
-    /** An enum member indicating that ForexType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ForexType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ForexType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ForexType enumValue : ForexType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerAddContactParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerAddContactParams.java
deleted file mode 100644
index a03d5d5f..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerAddContactParams.java
+++ /dev/null
@@ -1,147 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerAddContactParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerAddContactParams(CustomerAddContactBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerAddContactParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerAddContactBuilder builder() {
-    return new CustomerAddContactBuilder();
-  }
-
-  public static final class CustomerAddContactBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerAddContactBuilder() {}
-
-    public CustomerAddContactBuilder contact(ContactParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contact[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerAddContactParams build() {
-      return new CustomerAddContactParams(this);
-    }
-  }
-
-  public static final class ContactParams {
-
-    private final Map<String, Object> formData;
-
-    private ContactParams(ContactBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContactParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContactBuilder builder() {
-      return new ContactBuilder();
-    }
-
-    public static final class ContactBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContactBuilder() {}
-
-      public ContactBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public ContactBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ContactBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ContactBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ContactBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ContactBuilder label(String value) {
-
-        formData.put("label", value);
-
-        return this;
-      }
-
-      public ContactBuilder enabled(Boolean value) {
-
-        formData.put("enabled", value);
-
-        return this;
-      }
-
-      public ContactBuilder sendBillingEmail(Boolean value) {
-
-        formData.put("send_billing_email", value);
-
-        return this;
-      }
-
-      public ContactBuilder sendAccountEmail(Boolean value) {
-
-        formData.put("send_account_email", value);
-
-        return this;
-      }
-
-      public ContactParams build() {
-        return new ContactParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerAddPromotionalCreditsParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerAddPromotionalCreditsParams.java
deleted file mode 100644
index c6df73f3..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerAddPromotionalCreditsParams.java
+++ /dev/null
@@ -1,108 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerAddPromotionalCreditsParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerAddPromotionalCreditsParams(CustomerAddPromotionalCreditsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerAddPromotionalCreditsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerAddPromotionalCreditsBuilder builder() {
-    return new CustomerAddPromotionalCreditsBuilder();
-  }
-
-  public static final class CustomerAddPromotionalCreditsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerAddPromotionalCreditsBuilder() {}
-
-    public CustomerAddPromotionalCreditsBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public CustomerAddPromotionalCreditsBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public CustomerAddPromotionalCreditsBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public CustomerAddPromotionalCreditsBuilder creditType(CreditType value) {
-
-      formData.put("credit_type", value);
-
-      return this;
-    }
-
-    public CustomerAddPromotionalCreditsBuilder reference(String value) {
-
-      formData.put("reference", value);
-
-      return this;
-    }
-
-    public CustomerAddPromotionalCreditsParams build() {
-      return new CustomerAddPromotionalCreditsParams(this);
-    }
-  }
-
-  public enum CreditType {
-    LOYALTY_CREDITS("loyalty_credits"),
-
-    REFERRAL_REWARDS("referral_rewards"),
-
-    GENERAL("general"),
-
-    /** An enum member indicating that CreditType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CreditType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CreditType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CreditType enumValue : CreditType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerAssignPaymentRoleParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerAssignPaymentRoleParams.java
deleted file mode 100644
index 5e68995f..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerAssignPaymentRoleParams.java
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerAssignPaymentRoleParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerAssignPaymentRoleParams(CustomerAssignPaymentRoleBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerAssignPaymentRoleParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerAssignPaymentRoleBuilder builder() {
-    return new CustomerAssignPaymentRoleBuilder();
-  }
-
-  public static final class CustomerAssignPaymentRoleBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerAssignPaymentRoleBuilder() {}
-
-    public CustomerAssignPaymentRoleBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public CustomerAssignPaymentRoleBuilder role(Role value) {
-
-      formData.put("role", value);
-
-      return this;
-    }
-
-    public CustomerAssignPaymentRoleParams build() {
-      return new CustomerAssignPaymentRoleParams(this);
-    }
-  }
-
-  public enum Role {
-    PRIMARY("primary"),
-
-    BACKUP("backup"),
-
-    NONE("none"),
-
-    /** An enum member indicating that Role was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Role(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Role fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Role enumValue : Role.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerChangeBillingDateParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerChangeBillingDateParams.java
deleted file mode 100644
index 44bbc07c..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerChangeBillingDateParams.java
+++ /dev/null
@@ -1,174 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerChangeBillingDateParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerChangeBillingDateParams(CustomerChangeBillingDateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerChangeBillingDateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerChangeBillingDateBuilder builder() {
-    return new CustomerChangeBillingDateBuilder();
-  }
-
-  public static final class CustomerChangeBillingDateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerChangeBillingDateBuilder() {}
-
-    public CustomerChangeBillingDateBuilder billingDate(Integer value) {
-
-      formData.put("billing_date", value);
-
-      return this;
-    }
-
-    public CustomerChangeBillingDateBuilder billingMonth(Integer value) {
-
-      formData.put("billing_month", value);
-
-      return this;
-    }
-
-    public CustomerChangeBillingDateBuilder billingDateMode(BillingDateMode value) {
-
-      formData.put("billing_date_mode", value);
-
-      return this;
-    }
-
-    public CustomerChangeBillingDateBuilder billingDayOfWeek(BillingDayOfWeek value) {
-
-      formData.put("billing_day_of_week", value);
-
-      return this;
-    }
-
-    public CustomerChangeBillingDateBuilder billingDayOfWeekMode(BillingDayOfWeekMode value) {
-
-      formData.put("billing_day_of_week_mode", value);
-
-      return this;
-    }
-
-    public CustomerChangeBillingDateParams build() {
-      return new CustomerChangeBillingDateParams(this);
-    }
-  }
-
-  public enum BillingDateMode {
-    USING_DEFAULTS("using_defaults"),
-
-    MANUALLY_SET("manually_set"),
-
-    /** An enum member indicating that BillingDateMode was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingDateMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingDateMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingDateMode enumValue : BillingDateMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum BillingDayOfWeek {
-    SUNDAY("sunday"),
-
-    MONDAY("monday"),
-
-    TUESDAY("tuesday"),
-
-    WEDNESDAY("wednesday"),
-
-    THURSDAY("thursday"),
-
-    FRIDAY("friday"),
-
-    SATURDAY("saturday"),
-
-    /** An enum member indicating that BillingDayOfWeek was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingDayOfWeek(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingDayOfWeek fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingDayOfWeek enumValue : BillingDayOfWeek.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum BillingDayOfWeekMode {
-    USING_DEFAULTS("using_defaults"),
-
-    MANUALLY_SET("manually_set"),
-
-    /**
-     * An enum member indicating that BillingDayOfWeekMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingDayOfWeekMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingDayOfWeekMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingDayOfWeekMode enumValue : BillingDayOfWeekMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerCollectPaymentParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerCollectPaymentParams.java
deleted file mode 100644
index d32348ea..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerCollectPaymentParams.java
+++ /dev/null
@@ -1,667 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class CustomerCollectPaymentParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerCollectPaymentParams(CustomerCollectPaymentBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerCollectPaymentParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerCollectPaymentBuilder builder() {
-    return new CustomerCollectPaymentBuilder();
-  }
-
-  public static final class CustomerCollectPaymentBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerCollectPaymentBuilder() {}
-
-    public CustomerCollectPaymentBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public CustomerCollectPaymentBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public CustomerCollectPaymentBuilder tokenId(String value) {
-
-      formData.put("token_id", value);
-
-      return this;
-    }
-
-    public CustomerCollectPaymentBuilder replacePrimaryPaymentSource(Boolean value) {
-
-      formData.put("replace_primary_payment_source", value);
-
-      return this;
-    }
-
-    public CustomerCollectPaymentBuilder retainPaymentSource(Boolean value) {
-
-      formData.put("retain_payment_source", value);
-
-      return this;
-    }
-
-    public CustomerCollectPaymentBuilder paymentInitiator(PaymentInitiator value) {
-
-      formData.put("payment_initiator", value);
-
-      return this;
-    }
-
-    public CustomerCollectPaymentBuilder paymentMethod(PaymentMethodParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_method[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerCollectPaymentBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerCollectPaymentBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerCollectPaymentBuilder invoiceAllocations(List<InvoiceAllocationsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          InvoiceAllocationsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "invoice_allocations[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public CustomerCollectPaymentParams build() {
-      return new CustomerCollectPaymentParams(this);
-    }
-  }
-
-  public enum PaymentInitiator {
-    CUSTOMER("customer"),
-
-    MERCHANT("merchant"),
-
-    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentInitiator(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentInitiator fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class PaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentMethodParams(PaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentMethodBuilder builder() {
-      return new PaymentMethodBuilder();
-    }
-
-    public static final class PaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentMethodBuilder() {}
-
-      public PaymentMethodBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentMethodParams build() {
-        return new PaymentMethodParams(this);
-      }
-    }
-
-    public enum Type {
-      CARD("card"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      GENERIC("generic"),
-
-      ALIPAY("alipay"),
-
-      UNIONPAY("unionpay"),
-
-      APPLE_PAY("apple_pay"),
-
-      WECHAT_PAY("wechat_pay"),
-
-      IDEAL("ideal"),
-
-      GOOGLE_PAY("google_pay"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GIROPAY("giropay"),
-
-      DOTPAY("dotpay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      VENMO("venmo"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public CardBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CardBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CardBuilder number(String value) {
-
-        formData.put("number", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryMonth(Integer value) {
-
-        formData.put("expiry_month", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryYear(Integer value) {
-
-        formData.put("expiry_year", value);
-
-        return this;
-      }
-
-      public CardBuilder cvv(String value) {
-
-        formData.put("cvv", value);
-
-        return this;
-      }
-
-      public CardBuilder preferredScheme(PreferredScheme value) {
-
-        formData.put("preferred_scheme", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr1(String value) {
-
-        formData.put("billing_addr1", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr2(String value) {
-
-        formData.put("billing_addr2", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCity(String value) {
-
-        formData.put("billing_city", value);
-
-        return this;
-      }
-
-      public CardBuilder billingStateCode(String value) {
-
-        formData.put("billing_state_code", value);
-
-        return this;
-      }
-
-      public CardBuilder billingState(String value) {
-
-        formData.put("billing_state", value);
-
-        return this;
-      }
-
-      public CardBuilder billingZip(String value) {
-
-        formData.put("billing_zip", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCountry(String value) {
-
-        formData.put("billing_country", value);
-
-        return this;
-      }
-
-      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum PreferredScheme {
-      CARTES_BANCAIRES("cartes_bancaires"),
-
-      MASTERCARD("mastercard"),
-
-      VISA("visa"),
-
-      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PreferredScheme(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PreferredScheme fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PreferredScheme enumValue : PreferredScheme.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class InvoiceAllocationsParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceAllocationsParams(InvoiceAllocationsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceAllocationsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceAllocationsBuilder builder() {
-      return new InvoiceAllocationsBuilder();
-    }
-
-    public static final class InvoiceAllocationsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceAllocationsBuilder() {}
-
-      public InvoiceAllocationsBuilder invoiceId(String value) {
-
-        formData.put("invoice_id", value);
-
-        return this;
-      }
-
-      public InvoiceAllocationsBuilder allocationAmount(Long value) {
-
-        formData.put("allocation_amount", value);
-
-        return this;
-      }
-
-      public InvoiceAllocationsParams build() {
-        return new InvoiceAllocationsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerContactsForCustomerParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerContactsForCustomerParams.java
deleted file mode 100644
index 7d27d2d3..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerContactsForCustomerParams.java
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerContactsForCustomerParams {
-
-  private final Map<String, Object> queryParams;
-
-  private CustomerContactsForCustomerParams(CustomerContactsForCustomerBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public CustomerContactsForCustomerBuilder toBuilder() {
-    CustomerContactsForCustomerBuilder builder = new CustomerContactsForCustomerBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for CustomerContactsForCustomerParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerContactsForCustomerBuilder builder() {
-    return new CustomerContactsForCustomerBuilder();
-  }
-
-  public static final class CustomerContactsForCustomerBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private CustomerContactsForCustomerBuilder() {}
-
-    public CustomerContactsForCustomerBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public CustomerContactsForCustomerBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public CustomerContactsForCustomerParams build() {
-      return new CustomerContactsForCustomerParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerCreateParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerCreateParams.java
deleted file mode 100644
index 481b3ab4..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerCreateParams.java
+++ /dev/null
@@ -1,1944 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class CustomerCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerCreateParams(CustomerCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerCreateBuilder builder() {
-    return new CustomerCreateBuilder();
-  }
-
-  public static final class CustomerCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerCreateBuilder() {}
-
-    public CustomerCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder firstName(String value) {
-
-      formData.put("first_name", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder lastName(String value) {
-
-      formData.put("last_name", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder email(String value) {
-
-      formData.put("email", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder preferredCurrencyCode(String value) {
-
-      formData.put("preferred_currency_code", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder phone(String value) {
-
-      formData.put("phone", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder company(String value) {
-
-      formData.put("company", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder netTermDays(Integer value) {
-
-      formData.put("net_term_days", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder allowDirectDebit(Boolean value) {
-
-      formData.put("allow_direct_debit", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder vatNumber(String value) {
-
-      formData.put("vat_number", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder vatNumberPrefix(String value) {
-
-      formData.put("vat_number_prefix", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder entityIdentifierScheme(String value) {
-
-      formData.put("entity_identifier_scheme", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder entityIdentifierStandard(String value) {
-
-      formData.put("entity_identifier_standard", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder registeredForGst(Boolean value) {
-
-      formData.put("registered_for_gst", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder isEinvoiceEnabled(Boolean value) {
-
-      formData.put("is_einvoice_enabled", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder einvoicingMethod(EinvoicingMethod value) {
-
-      formData.put("einvoicing_method", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder taxability(Taxability value) {
-
-      formData.put("taxability", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder exemptionDetails(List<Object> value) {
-
-      formData.put("exemption_details", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public CustomerCreateBuilder customerType(CustomerType value) {
-
-      formData.put("customer_type", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder clientProfileId(String value) {
-
-      formData.put("client_profile_id", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder taxjarExemptionCategory(TaxjarExemptionCategory value) {
-
-      formData.put("taxjar_exemption_category", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder businessCustomerWithoutVatNumber(Boolean value) {
-
-      formData.put("business_customer_without_vat_number", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder locale(String value) {
-
-      formData.put("locale", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder entityCode(EntityCode value) {
-
-      formData.put("entity_code", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder exemptNumber(String value) {
-
-      formData.put("exempt_number", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public CustomerCreateBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-      formData.put("offline_payment_method", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder autoCloseInvoices(Boolean value) {
-
-      formData.put("auto_close_invoices", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder consolidatedInvoicing(Boolean value) {
-
-      formData.put("consolidated_invoicing", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder tokenId(String value) {
-
-      formData.put("token_id", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder businessEntityId(String value) {
-
-      formData.put("business_entity_id", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public CustomerCreateBuilder createdFromIp(String value) {
-
-      formData.put("created_from_ip", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public CustomerCreateBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerCreateBuilder bankAccount(BankAccountParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "bank_account[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerCreateBuilder paymentMethod(PaymentMethodParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_method[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerCreateBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerCreateBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerCreateBuilder entityIdentifiers(List<EntityIdentifiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EntityIdentifiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "entity_identifiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public CustomerCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public CustomerCreateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public CustomerCreateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerCreateParams build() {
-      return new CustomerCreateParams(this);
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum EinvoicingMethod {
-    AUTOMATIC("automatic"),
-
-    MANUAL("manual"),
-
-    SITE_DEFAULT("site_default"),
-
-    /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    EinvoicingMethod(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static EinvoicingMethod fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Taxability {
-    TAXABLE("taxable"),
-
-    EXEMPT("exempt"),
-
-    /** An enum member indicating that Taxability was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Taxability(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Taxability fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Taxability enumValue : Taxability.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum CustomerType {
-    RESIDENTIAL("residential"),
-
-    BUSINESS("business"),
-
-    SENIOR_CITIZEN("senior_citizen"),
-
-    INDUSTRIAL("industrial"),
-
-    /** An enum member indicating that CustomerType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CustomerType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CustomerType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CustomerType enumValue : CustomerType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TaxjarExemptionCategory {
-    WHOLESALE("wholesale"),
-
-    GOVERNMENT("government"),
-
-    OTHER("other"),
-
-    /**
-     * An enum member indicating that TaxjarExemptionCategory was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    TaxjarExemptionCategory(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TaxjarExemptionCategory fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TaxjarExemptionCategory enumValue : TaxjarExemptionCategory.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum EntityCode {
-    A("a"),
-
-    B("b"),
-
-    C("c"),
-
-    D("d"),
-
-    E("e"),
-
-    F("f"),
-
-    G("g"),
-
-    H("h"),
-
-    I("i"),
-
-    J("j"),
-
-    K("k"),
-
-    L("l"),
-
-    M("m"),
-
-    N("n"),
-
-    P("p"),
-
-    Q("q"),
-
-    R("r"),
-
-    MED_1("med1"),
-
-    MED_2("med2"),
-
-    /** An enum member indicating that EntityCode was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    EntityCode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static EntityCode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (EntityCode enumValue : EntityCode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum OfflinePaymentMethod {
-    NO_PREFERENCE("no_preference"),
-
-    CASH("cash"),
-
-    CHECK("check"),
-
-    BANK_TRANSFER("bank_transfer"),
-
-    ACH_CREDIT("ach_credit"),
-
-    SEPA_CREDIT("sepa_credit"),
-
-    BOLETO("boleto"),
-
-    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-    CUSTOM("custom"),
-
-    /**
-     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    OfflinePaymentMethod(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static OfflinePaymentMethod fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CardBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public CardBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CardBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CardBuilder number(String value) {
-
-        formData.put("number", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryMonth(Integer value) {
-
-        formData.put("expiry_month", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryYear(Integer value) {
-
-        formData.put("expiry_year", value);
-
-        return this;
-      }
-
-      public CardBuilder cvv(String value) {
-
-        formData.put("cvv", value);
-
-        return this;
-      }
-
-      public CardBuilder preferredScheme(PreferredScheme value) {
-
-        formData.put("preferred_scheme", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr1(String value) {
-
-        formData.put("billing_addr1", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr2(String value) {
-
-        formData.put("billing_addr2", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCity(String value) {
-
-        formData.put("billing_city", value);
-
-        return this;
-      }
-
-      public CardBuilder billingStateCode(String value) {
-
-        formData.put("billing_state_code", value);
-
-        return this;
-      }
-
-      public CardBuilder billingState(String value) {
-
-        formData.put("billing_state", value);
-
-        return this;
-      }
-
-      public CardBuilder billingZip(String value) {
-
-        formData.put("billing_zip", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCountry(String value) {
-
-        formData.put("billing_country", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CardBuilder ipAddress(String value) {
-
-        formData.put("ip_address", value);
-
-        return this;
-      }
-
-      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PreferredScheme {
-      CARTES_BANCAIRES("cartes_bancaires"),
-
-      MASTERCARD("mastercard"),
-
-      VISA("visa"),
-
-      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PreferredScheme(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PreferredScheme fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PreferredScheme enumValue : PreferredScheme.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BankAccountParams {
-
-    private final Map<String, Object> formData;
-
-    private BankAccountParams(BankAccountBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BankAccountParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BankAccountBuilder builder() {
-      return new BankAccountBuilder();
-    }
-
-    public static final class BankAccountBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BankAccountBuilder() {}
-
-      public BankAccountBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder iban(String value) {
-
-        formData.put("iban", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder bankName(String value) {
-
-        formData.put("bank_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountNumber(String value) {
-
-        formData.put("account_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder routingNumber(String value) {
-
-        formData.put("routing_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder bankCode(String value) {
-
-        formData.put("bank_code", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountType(AccountType value) {
-
-        formData.put("account_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountHolderType(AccountHolderType value) {
-
-        formData.put("account_holder_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder echeckType(EcheckType value) {
-
-        formData.put("echeck_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder issuingCountry(String value) {
-
-        formData.put("issuing_country", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder swedishIdentityNumber(String value) {
-
-        formData.put("swedish_identity_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder billingAddress(java.util.Map<String, Object> value) {
-
-        formData.put("billing_address", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public BankAccountParams build() {
-        return new BankAccountParams(this);
-      }
-    }
-
-    public enum AccountType {
-      CHECKING("checking"),
-
-      SAVINGS("savings"),
-
-      BUSINESS_CHECKING("business_checking"),
-
-      CURRENT("current"),
-
-      /** An enum member indicating that AccountType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AccountType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AccountType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AccountType enumValue : AccountType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum AccountHolderType {
-      INDIVIDUAL("individual"),
-
-      COMPANY("company"),
-
-      /**
-       * An enum member indicating that AccountHolderType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      AccountHolderType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AccountHolderType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AccountHolderType enumValue : AccountHolderType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum EcheckType {
-      WEB("web"),
-
-      PPD("ppd"),
-
-      CCD("ccd"),
-
-      /** An enum member indicating that EcheckType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EcheckType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EcheckType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EcheckType enumValue : EcheckType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentMethodParams(PaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentMethodBuilder builder() {
-      return new PaymentMethodBuilder();
-    }
-
-    public static final class PaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentMethodBuilder() {}
-
-      public PaymentMethodBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentMethodBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder issuingCountry(String value) {
-
-        formData.put("issuing_country", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentMethodParams build() {
-        return new PaymentMethodParams(this);
-      }
-    }
-
-    public enum Type {
-      CARD("card"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      GENERIC("generic"),
-
-      ALIPAY("alipay"),
-
-      UNIONPAY("unionpay"),
-
-      APPLE_PAY("apple_pay"),
-
-      WECHAT_PAY("wechat_pay"),
-
-      IDEAL("ideal"),
-
-      GOOGLE_PAY("google_pay"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GIROPAY("giropay"),
-
-      DOTPAY("dotpay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      VENMO("venmo"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      GOCARDLESS("gocardless"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class EntityIdentifiersParams {
-
-    private final Map<String, Object> formData;
-
-    private EntityIdentifiersParams(EntityIdentifiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EntityIdentifiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EntityIdentifiersBuilder builder() {
-      return new EntityIdentifiersBuilder();
-    }
-
-    public static final class EntityIdentifiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EntityIdentifiersBuilder() {}
-
-      public EntityIdentifiersBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder scheme(String value) {
-
-        formData.put("scheme", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder standard(String value) {
-
-        formData.put("standard", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersParams build() {
-        return new EntityIdentifiersParams(this);
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerDeductPromotionalCreditsParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerDeductPromotionalCreditsParams.java
deleted file mode 100644
index 055623d7..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerDeductPromotionalCreditsParams.java
+++ /dev/null
@@ -1,108 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerDeductPromotionalCreditsParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerDeductPromotionalCreditsParams(CustomerDeductPromotionalCreditsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerDeductPromotionalCreditsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerDeductPromotionalCreditsBuilder builder() {
-    return new CustomerDeductPromotionalCreditsBuilder();
-  }
-
-  public static final class CustomerDeductPromotionalCreditsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerDeductPromotionalCreditsBuilder() {}
-
-    public CustomerDeductPromotionalCreditsBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public CustomerDeductPromotionalCreditsBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public CustomerDeductPromotionalCreditsBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public CustomerDeductPromotionalCreditsBuilder creditType(CreditType value) {
-
-      formData.put("credit_type", value);
-
-      return this;
-    }
-
-    public CustomerDeductPromotionalCreditsBuilder reference(String value) {
-
-      formData.put("reference", value);
-
-      return this;
-    }
-
-    public CustomerDeductPromotionalCreditsParams build() {
-      return new CustomerDeductPromotionalCreditsParams(this);
-    }
-  }
-
-  public enum CreditType {
-    LOYALTY_CREDITS("loyalty_credits"),
-
-    REFERRAL_REWARDS("referral_rewards"),
-
-    GENERAL("general"),
-
-    /** An enum member indicating that CreditType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CreditType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CreditType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CreditType enumValue : CreditType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerDeleteContactParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerDeleteContactParams.java
deleted file mode 100644
index 868d0298..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerDeleteContactParams.java
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerDeleteContactParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerDeleteContactParams(CustomerDeleteContactBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerDeleteContactParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerDeleteContactBuilder builder() {
-    return new CustomerDeleteContactBuilder();
-  }
-
-  public static final class CustomerDeleteContactBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerDeleteContactBuilder() {}
-
-    public CustomerDeleteContactBuilder contact(ContactParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contact[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerDeleteContactParams build() {
-      return new CustomerDeleteContactParams(this);
-    }
-  }
-
-  public static final class ContactParams {
-
-    private final Map<String, Object> formData;
-
-    private ContactParams(ContactBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContactParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContactBuilder builder() {
-      return new ContactBuilder();
-    }
-
-    public static final class ContactBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContactBuilder() {}
-
-      public ContactBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public ContactParams build() {
-        return new ContactParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerDeleteParams.java
deleted file mode 100644
index 3b0ee1d2..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerDeleteParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerDeleteParams(CustomerDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerDeleteBuilder builder() {
-    return new CustomerDeleteBuilder();
-  }
-
-  public static final class CustomerDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerDeleteBuilder() {}
-
-    public CustomerDeleteBuilder deletePaymentMethod(Boolean value) {
-
-      formData.put("delete_payment_method", value);
-
-      return this;
-    }
-
-    public CustomerDeleteParams build() {
-      return new CustomerDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerMergeParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerMergeParams.java
deleted file mode 100644
index 1dabd1f7..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerMergeParams.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerMergeParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerMergeParams(CustomerMergeBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerMergeParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerMergeBuilder builder() {
-    return new CustomerMergeBuilder();
-  }
-
-  public static final class CustomerMergeBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerMergeBuilder() {}
-
-    public CustomerMergeBuilder fromCustomerId(String value) {
-
-      formData.put("from_customer_id", value);
-
-      return this;
-    }
-
-    public CustomerMergeBuilder toCustomerId(String value) {
-
-      formData.put("to_customer_id", value);
-
-      return this;
-    }
-
-    public CustomerMergeParams build() {
-      return new CustomerMergeParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerMoveParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerMoveParams.java
deleted file mode 100644
index 1861cd33..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerMoveParams.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerMoveParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerMoveParams(CustomerMoveBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerMoveParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerMoveBuilder builder() {
-    return new CustomerMoveBuilder();
-  }
-
-  public static final class CustomerMoveBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerMoveBuilder() {}
-
-    public CustomerMoveBuilder idAtFromSite(String value) {
-
-      formData.put("id_at_from_site", value);
-
-      return this;
-    }
-
-    public CustomerMoveBuilder fromSite(String value) {
-
-      formData.put("from_site", value);
-
-      return this;
-    }
-
-    public CustomerMoveParams build() {
-      return new CustomerMoveParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerRecordExcessPaymentParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerRecordExcessPaymentParams.java
deleted file mode 100644
index eedf4ff4..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerRecordExcessPaymentParams.java
+++ /dev/null
@@ -1,179 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class CustomerRecordExcessPaymentParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerRecordExcessPaymentParams(CustomerRecordExcessPaymentBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerRecordExcessPaymentParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerRecordExcessPaymentBuilder builder() {
-    return new CustomerRecordExcessPaymentBuilder();
-  }
-
-  public static final class CustomerRecordExcessPaymentBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerRecordExcessPaymentBuilder() {}
-
-    public CustomerRecordExcessPaymentBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public CustomerRecordExcessPaymentBuilder transaction(TransactionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "transaction[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerRecordExcessPaymentParams build() {
-      return new CustomerRecordExcessPaymentParams(this);
-    }
-  }
-
-  public static final class TransactionParams {
-
-    private final Map<String, Object> formData;
-
-    private TransactionParams(TransactionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TransactionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TransactionBuilder builder() {
-      return new TransactionBuilder();
-    }
-
-    public static final class TransactionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TransactionBuilder() {}
-
-      public TransactionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public TransactionBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public TransactionBuilder currencyCode(String value) {
-
-        formData.put("currency_code", value);
-
-        return this;
-      }
-
-      public TransactionBuilder date(Timestamp value) {
-
-        formData.put("date", value);
-
-        return this;
-      }
-
-      public TransactionBuilder paymentMethod(PaymentMethod value) {
-
-        formData.put("payment_method", value);
-
-        return this;
-      }
-
-      public TransactionBuilder referenceNumber(String value) {
-
-        formData.put("reference_number", value);
-
-        return this;
-      }
-
-      public TransactionBuilder customPaymentMethodId(String value) {
-
-        formData.put("custom_payment_method_id", value);
-
-        return this;
-      }
-
-      public TransactionParams build() {
-        return new TransactionParams(this);
-      }
-    }
-
-    public enum PaymentMethod {
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      OTHER("other"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethod enumValue : PaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerRelationshipsParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerRelationshipsParams.java
deleted file mode 100644
index 505a3def..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerRelationshipsParams.java
+++ /dev/null
@@ -1,355 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerRelationshipsParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerRelationshipsParams(CustomerRelationshipsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerRelationshipsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerRelationshipsBuilder builder() {
-    return new CustomerRelationshipsBuilder();
-  }
-
-  public static final class CustomerRelationshipsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerRelationshipsBuilder() {}
-
-    public CustomerRelationshipsBuilder parentId(String value) {
-
-      formData.put("parent_id", value);
-
-      return this;
-    }
-
-    public CustomerRelationshipsBuilder paymentOwnerId(String value) {
-
-      formData.put("payment_owner_id", value);
-
-      return this;
-    }
-
-    public CustomerRelationshipsBuilder invoiceOwnerId(String value) {
-
-      formData.put("invoice_owner_id", value);
-
-      return this;
-    }
-
-    public CustomerRelationshipsBuilder useDefaultHierarchySettings(Boolean value) {
-
-      formData.put("use_default_hierarchy_settings", value);
-
-      return this;
-    }
-
-    public CustomerRelationshipsBuilder parentAccountAccess(ParentAccountAccessParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "parent_account_access[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerRelationshipsBuilder childAccountAccess(ChildAccountAccessParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "child_account_access[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerRelationshipsParams build() {
-      return new CustomerRelationshipsParams(this);
-    }
-  }
-
-  public static final class ParentAccountAccessParams {
-
-    private final Map<String, Object> formData;
-
-    private ParentAccountAccessParams(ParentAccountAccessBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ParentAccountAccessParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ParentAccountAccessBuilder builder() {
-      return new ParentAccountAccessBuilder();
-    }
-
-    public static final class ParentAccountAccessBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ParentAccountAccessBuilder() {}
-
-      public ParentAccountAccessBuilder portalEditChildSubscriptions(
-          PortalEditChildSubscriptions value) {
-
-        formData.put("portal_edit_child_subscriptions", value);
-
-        return this;
-      }
-
-      public ParentAccountAccessBuilder portalDownloadChildInvoices(
-          PortalDownloadChildInvoices value) {
-
-        formData.put("portal_download_child_invoices", value);
-
-        return this;
-      }
-
-      public ParentAccountAccessBuilder sendSubscriptionEmails(Boolean value) {
-
-        formData.put("send_subscription_emails", value);
-
-        return this;
-      }
-
-      public ParentAccountAccessBuilder sendPaymentEmails(Boolean value) {
-
-        formData.put("send_payment_emails", value);
-
-        return this;
-      }
-
-      public ParentAccountAccessBuilder sendInvoiceEmails(Boolean value) {
-
-        formData.put("send_invoice_emails", value);
-
-        return this;
-      }
-
-      public ParentAccountAccessParams build() {
-        return new ParentAccountAccessParams(this);
-      }
-    }
-
-    public enum PortalEditChildSubscriptions {
-      YES("yes"),
-
-      VIEW_ONLY("view_only"),
-
-      NO("no"),
-
-      /**
-       * An enum member indicating that PortalEditChildSubscriptions was instantiated with an
-       * unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PortalEditChildSubscriptions(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PortalEditChildSubscriptions fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PortalEditChildSubscriptions enumValue : PortalEditChildSubscriptions.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PortalDownloadChildInvoices {
-      YES("yes"),
-
-      VIEW_ONLY("view_only"),
-
-      NO("no"),
-
-      /**
-       * An enum member indicating that PortalDownloadChildInvoices was instantiated with an unknown
-       * value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PortalDownloadChildInvoices(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PortalDownloadChildInvoices fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PortalDownloadChildInvoices enumValue : PortalDownloadChildInvoices.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChildAccountAccessParams {
-
-    private final Map<String, Object> formData;
-
-    private ChildAccountAccessParams(ChildAccountAccessBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChildAccountAccessParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChildAccountAccessBuilder builder() {
-      return new ChildAccountAccessBuilder();
-    }
-
-    public static final class ChildAccountAccessBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChildAccountAccessBuilder() {}
-
-      public ChildAccountAccessBuilder portalEditSubscriptions(PortalEditSubscriptions value) {
-
-        formData.put("portal_edit_subscriptions", value);
-
-        return this;
-      }
-
-      public ChildAccountAccessBuilder portalDownloadInvoices(PortalDownloadInvoices value) {
-
-        formData.put("portal_download_invoices", value);
-
-        return this;
-      }
-
-      public ChildAccountAccessBuilder sendSubscriptionEmails(Boolean value) {
-
-        formData.put("send_subscription_emails", value);
-
-        return this;
-      }
-
-      public ChildAccountAccessBuilder sendPaymentEmails(Boolean value) {
-
-        formData.put("send_payment_emails", value);
-
-        return this;
-      }
-
-      public ChildAccountAccessBuilder sendInvoiceEmails(Boolean value) {
-
-        formData.put("send_invoice_emails", value);
-
-        return this;
-      }
-
-      public ChildAccountAccessParams build() {
-        return new ChildAccountAccessParams(this);
-      }
-    }
-
-    public enum PortalEditSubscriptions {
-      YES("yes"),
-
-      VIEW_ONLY("view_only"),
-
-      /**
-       * An enum member indicating that PortalEditSubscriptions was instantiated with an unknown
-       * value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PortalEditSubscriptions(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PortalEditSubscriptions fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PortalEditSubscriptions enumValue : PortalEditSubscriptions.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PortalDownloadInvoices {
-      YES("yes"),
-
-      VIEW_ONLY("view_only"),
-
-      NO("no"),
-
-      /**
-       * An enum member indicating that PortalDownloadInvoices was instantiated with an unknown
-       * value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PortalDownloadInvoices(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PortalDownloadInvoices fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PortalDownloadInvoices enumValue : PortalDownloadInvoices.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerSetPromotionalCreditsParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerSetPromotionalCreditsParams.java
deleted file mode 100644
index b777f7c5..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerSetPromotionalCreditsParams.java
+++ /dev/null
@@ -1,108 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerSetPromotionalCreditsParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerSetPromotionalCreditsParams(CustomerSetPromotionalCreditsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerSetPromotionalCreditsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerSetPromotionalCreditsBuilder builder() {
-    return new CustomerSetPromotionalCreditsBuilder();
-  }
-
-  public static final class CustomerSetPromotionalCreditsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerSetPromotionalCreditsBuilder() {}
-
-    public CustomerSetPromotionalCreditsBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public CustomerSetPromotionalCreditsBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public CustomerSetPromotionalCreditsBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public CustomerSetPromotionalCreditsBuilder creditType(CreditType value) {
-
-      formData.put("credit_type", value);
-
-      return this;
-    }
-
-    public CustomerSetPromotionalCreditsBuilder reference(String value) {
-
-      formData.put("reference", value);
-
-      return this;
-    }
-
-    public CustomerSetPromotionalCreditsParams build() {
-      return new CustomerSetPromotionalCreditsParams(this);
-    }
-  }
-
-  public enum CreditType {
-    LOYALTY_CREDITS("loyalty_credits"),
-
-    REFERRAL_REWARDS("referral_rewards"),
-
-    GENERAL("general"),
-
-    /** An enum member indicating that CreditType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CreditType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CreditType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CreditType enumValue : CreditType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdateBillingInfoParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdateBillingInfoParams.java
deleted file mode 100644
index bfe880af..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdateBillingInfoParams.java
+++ /dev/null
@@ -1,480 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class CustomerUpdateBillingInfoParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerUpdateBillingInfoParams(CustomerUpdateBillingInfoBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerUpdateBillingInfoParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerUpdateBillingInfoBuilder builder() {
-    return new CustomerUpdateBillingInfoBuilder();
-  }
-
-  public static final class CustomerUpdateBillingInfoBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerUpdateBillingInfoBuilder() {}
-
-    public CustomerUpdateBillingInfoBuilder vatNumber(String value) {
-
-      formData.put("vat_number", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBillingInfoBuilder vatNumberPrefix(String value) {
-
-      formData.put("vat_number_prefix", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBillingInfoBuilder entityIdentifierScheme(String value) {
-
-      formData.put("entity_identifier_scheme", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBillingInfoBuilder entityIdentifierStandard(String value) {
-
-      formData.put("entity_identifier_standard", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBillingInfoBuilder registeredForGst(Boolean value) {
-
-      formData.put("registered_for_gst", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBillingInfoBuilder businessCustomerWithoutVatNumber(Boolean value) {
-
-      formData.put("business_customer_without_vat_number", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBillingInfoBuilder isEinvoiceEnabled(Boolean value) {
-
-      formData.put("is_einvoice_enabled", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBillingInfoBuilder einvoicingMethod(EinvoicingMethod value) {
-
-      formData.put("einvoicing_method", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBillingInfoBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerUpdateBillingInfoBuilder entityIdentifiers(List<EntityIdentifiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EntityIdentifiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "entity_identifiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public CustomerUpdateBillingInfoBuilder taxProvidersFields(
-        List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public CustomerUpdateBillingInfoParams build() {
-      return new CustomerUpdateBillingInfoParams(this);
-    }
-  }
-
-  public enum EinvoicingMethod {
-    AUTOMATIC("automatic"),
-
-    MANUAL("manual"),
-
-    SITE_DEFAULT("site_default"),
-
-    /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    EinvoicingMethod(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static EinvoicingMethod fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class EntityIdentifiersParams {
-
-    private final Map<String, Object> formData;
-
-    private EntityIdentifiersParams(EntityIdentifiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EntityIdentifiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EntityIdentifiersBuilder builder() {
-      return new EntityIdentifiersBuilder();
-    }
-
-    public static final class EntityIdentifiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EntityIdentifiersBuilder() {}
-
-      public EntityIdentifiersBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder scheme(String value) {
-
-        formData.put("scheme", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder operation(Operation value) {
-
-        formData.put("operation", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder standard(String value) {
-
-        formData.put("standard", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersParams build() {
-        return new EntityIdentifiersParams(this);
-      }
-    }
-
-    public enum Operation {
-      CREATE("create"),
-
-      UPDATE("update"),
-
-      DELETE("delete"),
-
-      /** An enum member indicating that Operation was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Operation(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Operation fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Operation enumValue : Operation.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdateContactParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdateContactParams.java
deleted file mode 100644
index 0288f0e3..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdateContactParams.java
+++ /dev/null
@@ -1,147 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerUpdateContactParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerUpdateContactParams(CustomerUpdateContactBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerUpdateContactParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerUpdateContactBuilder builder() {
-    return new CustomerUpdateContactBuilder();
-  }
-
-  public static final class CustomerUpdateContactBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerUpdateContactBuilder() {}
-
-    public CustomerUpdateContactBuilder contact(ContactParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contact[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerUpdateContactParams build() {
-      return new CustomerUpdateContactParams(this);
-    }
-  }
-
-  public static final class ContactParams {
-
-    private final Map<String, Object> formData;
-
-    private ContactParams(ContactBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContactParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContactBuilder builder() {
-      return new ContactBuilder();
-    }
-
-    public static final class ContactBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContactBuilder() {}
-
-      public ContactBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public ContactBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ContactBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ContactBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ContactBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ContactBuilder label(String value) {
-
-        formData.put("label", value);
-
-        return this;
-      }
-
-      public ContactBuilder enabled(Boolean value) {
-
-        formData.put("enabled", value);
-
-        return this;
-      }
-
-      public ContactBuilder sendBillingEmail(Boolean value) {
-
-        formData.put("send_billing_email", value);
-
-        return this;
-      }
-
-      public ContactBuilder sendAccountEmail(Boolean value) {
-
-        formData.put("send_account_email", value);
-
-        return this;
-      }
-
-      public ContactParams build() {
-        return new ContactParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdateHierarchySettingsParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdateHierarchySettingsParams.java
deleted file mode 100644
index e369491a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdateHierarchySettingsParams.java
+++ /dev/null
@@ -1,336 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerUpdateHierarchySettingsParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerUpdateHierarchySettingsParams(CustomerUpdateHierarchySettingsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerUpdateHierarchySettingsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerUpdateHierarchySettingsBuilder builder() {
-    return new CustomerUpdateHierarchySettingsBuilder();
-  }
-
-  public static final class CustomerUpdateHierarchySettingsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerUpdateHierarchySettingsBuilder() {}
-
-    public CustomerUpdateHierarchySettingsBuilder useDefaultHierarchySettings(Boolean value) {
-
-      formData.put("use_default_hierarchy_settings", value);
-
-      return this;
-    }
-
-    public CustomerUpdateHierarchySettingsBuilder parentAccountAccess(
-        ParentAccountAccessParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "parent_account_access[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerUpdateHierarchySettingsBuilder childAccountAccess(
-        ChildAccountAccessParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "child_account_access[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerUpdateHierarchySettingsParams build() {
-      return new CustomerUpdateHierarchySettingsParams(this);
-    }
-  }
-
-  public static final class ParentAccountAccessParams {
-
-    private final Map<String, Object> formData;
-
-    private ParentAccountAccessParams(ParentAccountAccessBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ParentAccountAccessParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ParentAccountAccessBuilder builder() {
-      return new ParentAccountAccessBuilder();
-    }
-
-    public static final class ParentAccountAccessBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ParentAccountAccessBuilder() {}
-
-      public ParentAccountAccessBuilder portalEditChildSubscriptions(
-          PortalEditChildSubscriptions value) {
-
-        formData.put("portal_edit_child_subscriptions", value);
-
-        return this;
-      }
-
-      public ParentAccountAccessBuilder portalDownloadChildInvoices(
-          PortalDownloadChildInvoices value) {
-
-        formData.put("portal_download_child_invoices", value);
-
-        return this;
-      }
-
-      public ParentAccountAccessBuilder sendSubscriptionEmails(Boolean value) {
-
-        formData.put("send_subscription_emails", value);
-
-        return this;
-      }
-
-      public ParentAccountAccessBuilder sendPaymentEmails(Boolean value) {
-
-        formData.put("send_payment_emails", value);
-
-        return this;
-      }
-
-      public ParentAccountAccessBuilder sendInvoiceEmails(Boolean value) {
-
-        formData.put("send_invoice_emails", value);
-
-        return this;
-      }
-
-      public ParentAccountAccessParams build() {
-        return new ParentAccountAccessParams(this);
-      }
-    }
-
-    public enum PortalEditChildSubscriptions {
-      YES("yes"),
-
-      VIEW_ONLY("view_only"),
-
-      NO("no"),
-
-      /**
-       * An enum member indicating that PortalEditChildSubscriptions was instantiated with an
-       * unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PortalEditChildSubscriptions(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PortalEditChildSubscriptions fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PortalEditChildSubscriptions enumValue : PortalEditChildSubscriptions.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PortalDownloadChildInvoices {
-      YES("yes"),
-
-      VIEW_ONLY("view_only"),
-
-      NO("no"),
-
-      /**
-       * An enum member indicating that PortalDownloadChildInvoices was instantiated with an unknown
-       * value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PortalDownloadChildInvoices(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PortalDownloadChildInvoices fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PortalDownloadChildInvoices enumValue : PortalDownloadChildInvoices.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChildAccountAccessParams {
-
-    private final Map<String, Object> formData;
-
-    private ChildAccountAccessParams(ChildAccountAccessBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChildAccountAccessParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChildAccountAccessBuilder builder() {
-      return new ChildAccountAccessBuilder();
-    }
-
-    public static final class ChildAccountAccessBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChildAccountAccessBuilder() {}
-
-      public ChildAccountAccessBuilder portalEditSubscriptions(PortalEditSubscriptions value) {
-
-        formData.put("portal_edit_subscriptions", value);
-
-        return this;
-      }
-
-      public ChildAccountAccessBuilder portalDownloadInvoices(PortalDownloadInvoices value) {
-
-        formData.put("portal_download_invoices", value);
-
-        return this;
-      }
-
-      public ChildAccountAccessBuilder sendSubscriptionEmails(Boolean value) {
-
-        formData.put("send_subscription_emails", value);
-
-        return this;
-      }
-
-      public ChildAccountAccessBuilder sendPaymentEmails(Boolean value) {
-
-        formData.put("send_payment_emails", value);
-
-        return this;
-      }
-
-      public ChildAccountAccessBuilder sendInvoiceEmails(Boolean value) {
-
-        formData.put("send_invoice_emails", value);
-
-        return this;
-      }
-
-      public ChildAccountAccessParams build() {
-        return new ChildAccountAccessParams(this);
-      }
-    }
-
-    public enum PortalEditSubscriptions {
-      YES("yes"),
-
-      VIEW_ONLY("view_only"),
-
-      /**
-       * An enum member indicating that PortalEditSubscriptions was instantiated with an unknown
-       * value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PortalEditSubscriptions(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PortalEditSubscriptions fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PortalEditSubscriptions enumValue : PortalEditSubscriptions.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PortalDownloadInvoices {
-      YES("yes"),
-
-      VIEW_ONLY("view_only"),
-
-      NO("no"),
-
-      /**
-       * An enum member indicating that PortalDownloadInvoices was instantiated with an unknown
-       * value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PortalDownloadInvoices(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PortalDownloadInvoices fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PortalDownloadInvoices enumValue : PortalDownloadInvoices.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdateParams.java
deleted file mode 100644
index f1c40b60..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdateParams.java
+++ /dev/null
@@ -1,572 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class CustomerUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerUpdateParams(CustomerUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerUpdateBuilder builder() {
-    return new CustomerUpdateBuilder();
-  }
-
-  public static final class CustomerUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerUpdateBuilder() {}
-
-    public CustomerUpdateBuilder firstName(String value) {
-
-      formData.put("first_name", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder lastName(String value) {
-
-      formData.put("last_name", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder email(String value) {
-
-      formData.put("email", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder preferredCurrencyCode(String value) {
-
-      formData.put("preferred_currency_code", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder phone(String value) {
-
-      formData.put("phone", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder company(String value) {
-
-      formData.put("company", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder allowDirectDebit(Boolean value) {
-
-      formData.put("allow_direct_debit", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder netTermDays(Integer value) {
-
-      formData.put("net_term_days", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder taxability(Taxability value) {
-
-      formData.put("taxability", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder exemptionDetails(List<Object> value) {
-
-      formData.put("exemption_details", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder customerType(CustomerType value) {
-
-      formData.put("customer_type", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder clientProfileId(String value) {
-
-      formData.put("client_profile_id", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder taxjarExemptionCategory(TaxjarExemptionCategory value) {
-
-      formData.put("taxjar_exemption_category", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder locale(String value) {
-
-      formData.put("locale", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder entityCode(EntityCode value) {
-
-      formData.put("entity_code", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder exemptNumber(String value) {
-
-      formData.put("exempt_number", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-      formData.put("offline_payment_method", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder autoCloseInvoices(Boolean value) {
-
-      formData.put("auto_close_invoices", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder fraudFlag(FraudFlag value) {
-
-      formData.put("fraud_flag", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder consolidatedInvoicing(Boolean value) {
-
-      formData.put("consolidated_invoicing", value);
-
-      return this;
-    }
-
-    public CustomerUpdateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public CustomerUpdateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public CustomerUpdateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerUpdateParams build() {
-      return new CustomerUpdateParams(this);
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Taxability {
-    TAXABLE("taxable"),
-
-    EXEMPT("exempt"),
-
-    /** An enum member indicating that Taxability was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Taxability(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Taxability fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Taxability enumValue : Taxability.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum CustomerType {
-    RESIDENTIAL("residential"),
-
-    BUSINESS("business"),
-
-    SENIOR_CITIZEN("senior_citizen"),
-
-    INDUSTRIAL("industrial"),
-
-    /** An enum member indicating that CustomerType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CustomerType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CustomerType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CustomerType enumValue : CustomerType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TaxjarExemptionCategory {
-    WHOLESALE("wholesale"),
-
-    GOVERNMENT("government"),
-
-    OTHER("other"),
-
-    /**
-     * An enum member indicating that TaxjarExemptionCategory was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    TaxjarExemptionCategory(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TaxjarExemptionCategory fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TaxjarExemptionCategory enumValue : TaxjarExemptionCategory.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum EntityCode {
-    A("a"),
-
-    B("b"),
-
-    C("c"),
-
-    D("d"),
-
-    E("e"),
-
-    F("f"),
-
-    G("g"),
-
-    H("h"),
-
-    I("i"),
-
-    J("j"),
-
-    K("k"),
-
-    L("l"),
-
-    M("m"),
-
-    N("n"),
-
-    P("p"),
-
-    Q("q"),
-
-    R("r"),
-
-    MED_1("med1"),
-
-    MED_2("med2"),
-
-    /** An enum member indicating that EntityCode was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    EntityCode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static EntityCode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (EntityCode enumValue : EntityCode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum OfflinePaymentMethod {
-    NO_PREFERENCE("no_preference"),
-
-    CASH("cash"),
-
-    CHECK("check"),
-
-    BANK_TRANSFER("bank_transfer"),
-
-    ACH_CREDIT("ach_credit"),
-
-    SEPA_CREDIT("sepa_credit"),
-
-    BOLETO("boleto"),
-
-    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-    CUSTOM("custom"),
-
-    /**
-     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    OfflinePaymentMethod(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static OfflinePaymentMethod fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum FraudFlag {
-    SAFE("safe"),
-
-    FRAUDULENT("fraudulent"),
-
-    /** An enum member indicating that FraudFlag was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    FraudFlag(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static FraudFlag fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (FraudFlag enumValue : FraudFlag.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdatePaymentMethodParams.java b/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdatePaymentMethodParams.java
deleted file mode 100644
index 80ecdc86..00000000
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerUpdatePaymentMethodParams.java
+++ /dev/null
@@ -1,339 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.customer.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class CustomerUpdatePaymentMethodParams {
-
-  private final Map<String, Object> formData;
-
-  private CustomerUpdatePaymentMethodParams(CustomerUpdatePaymentMethodBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for CustomerUpdatePaymentMethodParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static CustomerUpdatePaymentMethodBuilder builder() {
-    return new CustomerUpdatePaymentMethodBuilder();
-  }
-
-  public static final class CustomerUpdatePaymentMethodBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private CustomerUpdatePaymentMethodBuilder() {}
-
-    public CustomerUpdatePaymentMethodBuilder paymentMethod(PaymentMethodParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_method[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public CustomerUpdatePaymentMethodParams build() {
-      return new CustomerUpdatePaymentMethodParams(this);
-    }
-  }
-
-  public static final class PaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentMethodParams(PaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentMethodBuilder builder() {
-      return new PaymentMethodBuilder();
-    }
-
-    public static final class PaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentMethodBuilder() {}
-
-      public PaymentMethodBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentMethodBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder issuingCountry(String value) {
-
-        formData.put("issuing_country", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentMethodParams build() {
-        return new PaymentMethodParams(this);
-      }
-    }
-
-    public enum Type {
-      CARD("card"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      GENERIC("generic"),
-
-      ALIPAY("alipay"),
-
-      UNIONPAY("unionpay"),
-
-      WECHAT_PAY("wechat_pay"),
-
-      IDEAL("ideal"),
-
-      GOOGLE_PAY("google_pay"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GIROPAY("giropay"),
-
-      DOTPAY("dotpay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      VENMO("venmo"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      GOCARDLESS("gocardless"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceCreateParams.java b/src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceCreateParams.java
deleted file mode 100644
index a08c17b9..00000000
--- a/src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceCreateParams.java
+++ /dev/null
@@ -1,297 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.differentialPrice.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class DifferentialPriceCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private DifferentialPriceCreateParams(DifferentialPriceCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for DifferentialPriceCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static DifferentialPriceCreateBuilder builder() {
-    return new DifferentialPriceCreateBuilder();
-  }
-
-  public static final class DifferentialPriceCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private DifferentialPriceCreateBuilder() {}
-
-    public DifferentialPriceCreateBuilder parentItemId(String value) {
-
-      formData.put("parent_item_id", value);
-
-      return this;
-    }
-
-    public DifferentialPriceCreateBuilder price(Long value) {
-
-      formData.put("price", value);
-
-      return this;
-    }
-
-    public DifferentialPriceCreateBuilder priceInDecimal(String value) {
-
-      formData.put("price_in_decimal", value);
-
-      return this;
-    }
-
-    public DifferentialPriceCreateBuilder businessEntityId(String value) {
-
-      formData.put("business_entity_id", value);
-
-      return this;
-    }
-
-    public DifferentialPriceCreateBuilder parentPeriods(List<ParentPeriodsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ParentPeriodsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "parent_periods[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public DifferentialPriceCreateBuilder tiers(List<TiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public DifferentialPriceCreateParams build() {
-      return new DifferentialPriceCreateParams(this);
-    }
-  }
-
-  public static final class ParentPeriodsParams {
-
-    private final Map<String, Object> formData;
-
-    private ParentPeriodsParams(ParentPeriodsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ParentPeriodsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ParentPeriodsBuilder builder() {
-      return new ParentPeriodsBuilder();
-    }
-
-    public static final class ParentPeriodsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ParentPeriodsBuilder() {}
-
-      public ParentPeriodsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public ParentPeriodsBuilder period(List<Object> value) {
-
-        formData.put("period", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public ParentPeriodsParams build() {
-        return new ParentPeriodsParams(this);
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TiersParams {
-
-    private final Map<String, Object> formData;
-
-    private TiersParams(TiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TiersBuilder builder() {
-      return new TiersBuilder();
-    }
-
-    public static final class TiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TiersBuilder() {}
-
-      public TiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public TiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public TiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public TiersParams build() {
-        return new TiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceDeleteParams.java
deleted file mode 100644
index 73798c3b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceDeleteParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.differentialPrice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class DifferentialPriceDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private DifferentialPriceDeleteParams(DifferentialPriceDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for DifferentialPriceDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static DifferentialPriceDeleteBuilder builder() {
-    return new DifferentialPriceDeleteBuilder();
-  }
-
-  public static final class DifferentialPriceDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private DifferentialPriceDeleteBuilder() {}
-
-    public DifferentialPriceDeleteBuilder itemPriceId(String value) {
-
-      formData.put("item_price_id", value);
-
-      return this;
-    }
-
-    public DifferentialPriceDeleteParams build() {
-      return new DifferentialPriceDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceUpdateParams.java
deleted file mode 100644
index bccb3cab..00000000
--- a/src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceUpdateParams.java
+++ /dev/null
@@ -1,290 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.differentialPrice.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class DifferentialPriceUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private DifferentialPriceUpdateParams(DifferentialPriceUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for DifferentialPriceUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static DifferentialPriceUpdateBuilder builder() {
-    return new DifferentialPriceUpdateBuilder();
-  }
-
-  public static final class DifferentialPriceUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private DifferentialPriceUpdateBuilder() {}
-
-    public DifferentialPriceUpdateBuilder itemPriceId(String value) {
-
-      formData.put("item_price_id", value);
-
-      return this;
-    }
-
-    public DifferentialPriceUpdateBuilder price(Long value) {
-
-      formData.put("price", value);
-
-      return this;
-    }
-
-    public DifferentialPriceUpdateBuilder priceInDecimal(String value) {
-
-      formData.put("price_in_decimal", value);
-
-      return this;
-    }
-
-    public DifferentialPriceUpdateBuilder parentPeriods(List<ParentPeriodsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ParentPeriodsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "parent_periods[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public DifferentialPriceUpdateBuilder tiers(List<TiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public DifferentialPriceUpdateParams build() {
-      return new DifferentialPriceUpdateParams(this);
-    }
-  }
-
-  public static final class ParentPeriodsParams {
-
-    private final Map<String, Object> formData;
-
-    private ParentPeriodsParams(ParentPeriodsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ParentPeriodsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ParentPeriodsBuilder builder() {
-      return new ParentPeriodsBuilder();
-    }
-
-    public static final class ParentPeriodsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ParentPeriodsBuilder() {}
-
-      public ParentPeriodsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public ParentPeriodsBuilder period(List<Object> value) {
-
-        formData.put("period", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public ParentPeriodsParams build() {
-        return new ParentPeriodsParams(this);
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TiersParams {
-
-    private final Map<String, Object> formData;
-
-    private TiersParams(TiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TiersBuilder builder() {
-      return new TiersBuilder();
-    }
-
-    public static final class TiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TiersBuilder() {}
-
-      public TiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public TiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public TiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public TiersParams build() {
-        return new TiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/entitlement/params/EntitlementCreateParams.java b/src/main/java/com/chargebee/v4/core/models/entitlement/params/EntitlementCreateParams.java
deleted file mode 100644
index cbc1479b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/entitlement/params/EntitlementCreateParams.java
+++ /dev/null
@@ -1,201 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.entitlement.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class EntitlementCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private EntitlementCreateParams(EntitlementCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EntitlementCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EntitlementCreateBuilder builder() {
-    return new EntitlementCreateBuilder();
-  }
-
-  public static final class EntitlementCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EntitlementCreateBuilder() {}
-
-    public EntitlementCreateBuilder action(Action value) {
-
-      formData.put("action", value);
-
-      return this;
-    }
-
-    public EntitlementCreateBuilder changeReason(String value) {
-
-      formData.put("change_reason", value);
-
-      return this;
-    }
-
-    public EntitlementCreateBuilder entitlements(List<EntitlementsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EntitlementsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "entitlements[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EntitlementCreateParams build() {
-      return new EntitlementCreateParams(this);
-    }
-  }
-
-  public enum Action {
-    UPSERT("upsert"),
-
-    REMOVE("remove"),
-
-    /** An enum member indicating that Action was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Action(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Action fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Action enumValue : Action.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class EntitlementsParams {
-
-    private final Map<String, Object> formData;
-
-    private EntitlementsParams(EntitlementsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EntitlementsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EntitlementsBuilder builder() {
-      return new EntitlementsBuilder();
-    }
-
-    public static final class EntitlementsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EntitlementsBuilder() {}
-
-      public EntitlementsBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public EntitlementsBuilder featureId(String value) {
-
-        formData.put("feature_id", value);
-
-        return this;
-      }
-
-      public EntitlementsBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public EntitlementsBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public EntitlementsBuilder applyGrandfathering(Boolean value) {
-
-        formData.put("apply_grandfathering", value);
-
-        return this;
-      }
-
-      public EntitlementsParams build() {
-        return new EntitlementsParams(this);
-      }
-    }
-
-    public enum EntityType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      PLAN_PRICE("plan_price"),
-
-      ADDON_PRICE("addon_price"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/entitlementOverride/params/EntitlementOverrideAddEntitlementOverrideForSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/entitlementOverride/params/EntitlementOverrideAddEntitlementOverrideForSubscriptionParams.java
deleted file mode 100644
index 0546601d..00000000
--- a/src/main/java/com/chargebee/v4/core/models/entitlementOverride/params/EntitlementOverrideAddEntitlementOverrideForSubscriptionParams.java
+++ /dev/null
@@ -1,156 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.entitlementOverride.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class EntitlementOverrideAddEntitlementOverrideForSubscriptionParams {
-
-  private final Map<String, Object> formData;
-
-  private EntitlementOverrideAddEntitlementOverrideForSubscriptionParams(
-      EntitlementOverrideAddEntitlementOverrideForSubscriptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EntitlementOverrideAddEntitlementOverrideForSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EntitlementOverrideAddEntitlementOverrideForSubscriptionBuilder builder() {
-    return new EntitlementOverrideAddEntitlementOverrideForSubscriptionBuilder();
-  }
-
-  public static final class EntitlementOverrideAddEntitlementOverrideForSubscriptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EntitlementOverrideAddEntitlementOverrideForSubscriptionBuilder() {}
-
-    public EntitlementOverrideAddEntitlementOverrideForSubscriptionBuilder action(Action value) {
-
-      formData.put("action", value);
-
-      return this;
-    }
-
-    public EntitlementOverrideAddEntitlementOverrideForSubscriptionBuilder entitlementOverrides(
-        List<EntitlementOverridesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EntitlementOverridesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "entitlement_overrides[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EntitlementOverrideAddEntitlementOverrideForSubscriptionParams build() {
-      return new EntitlementOverrideAddEntitlementOverrideForSubscriptionParams(this);
-    }
-  }
-
-  public enum Action {
-    UPSERT("upsert"),
-
-    REMOVE("remove"),
-
-    /** An enum member indicating that Action was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Action(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Action fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Action enumValue : Action.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class EntitlementOverridesParams {
-
-    private final Map<String, Object> formData;
-
-    private EntitlementOverridesParams(EntitlementOverridesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EntitlementOverridesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EntitlementOverridesBuilder builder() {
-      return new EntitlementOverridesBuilder();
-    }
-
-    public static final class EntitlementOverridesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EntitlementOverridesBuilder() {}
-
-      public EntitlementOverridesBuilder featureId(String value) {
-
-        formData.put("feature_id", value);
-
-        return this;
-      }
-
-      public EntitlementOverridesBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public EntitlementOverridesBuilder expiresAt(Timestamp value) {
-
-        formData.put("expires_at", value);
-
-        return this;
-      }
-
-      public EntitlementOverridesBuilder effectiveFrom(Timestamp value) {
-
-        formData.put("effective_from", value);
-
-        return this;
-      }
-
-      public EntitlementOverridesParams build() {
-        return new EntitlementOverridesParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/entitlementOverride/params/EntitlementOverrideListEntitlementOverrideForSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/entitlementOverride/params/EntitlementOverrideListEntitlementOverrideForSubscriptionParams.java
deleted file mode 100644
index 91a3037a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/entitlementOverride/params/EntitlementOverrideListEntitlementOverrideForSubscriptionParams.java
+++ /dev/null
@@ -1,82 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.entitlementOverride.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class EntitlementOverrideListEntitlementOverrideForSubscriptionParams {
-
-  private final Map<String, Object> queryParams;
-
-  private EntitlementOverrideListEntitlementOverrideForSubscriptionParams(
-      EntitlementOverrideListEntitlementOverrideForSubscriptionBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public EntitlementOverrideListEntitlementOverrideForSubscriptionBuilder toBuilder() {
-    EntitlementOverrideListEntitlementOverrideForSubscriptionBuilder builder =
-        new EntitlementOverrideListEntitlementOverrideForSubscriptionBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for EntitlementOverrideListEntitlementOverrideForSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EntitlementOverrideListEntitlementOverrideForSubscriptionBuilder builder() {
-    return new EntitlementOverrideListEntitlementOverrideForSubscriptionBuilder();
-  }
-
-  public static final class EntitlementOverrideListEntitlementOverrideForSubscriptionBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private EntitlementOverrideListEntitlementOverrideForSubscriptionBuilder() {}
-
-    public EntitlementOverrideListEntitlementOverrideForSubscriptionBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public EntitlementOverrideListEntitlementOverrideForSubscriptionBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    @Deprecated
-    public EntitlementOverrideListEntitlementOverrideForSubscriptionBuilder embed(String value) {
-      queryParams.put("embed", value);
-      return this;
-    }
-
-    @Deprecated
-    public EntitlementOverrideListEntitlementOverrideForSubscriptionBuilder includeDrafts(
-        Boolean value) {
-      queryParams.put("include_drafts", value);
-      return this;
-    }
-
-    @Deprecated
-    public EntitlementOverrideListEntitlementOverrideForSubscriptionBuilder
-        includeScheduledOverrides(Boolean value) {
-      queryParams.put("include_scheduled_overrides", value);
-      return this;
-    }
-
-    public EntitlementOverrideListEntitlementOverrideForSubscriptionParams build() {
-      return new EntitlementOverrideListEntitlementOverrideForSubscriptionParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateAdvanceInvoiceEstimateParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateAdvanceInvoiceEstimateParams.java
deleted file mode 100644
index 98e4f331..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateAdvanceInvoiceEstimateParams.java
+++ /dev/null
@@ -1,257 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class EstimateAdvanceInvoiceEstimateParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateAdvanceInvoiceEstimateParams(EstimateAdvanceInvoiceEstimateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateAdvanceInvoiceEstimateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateAdvanceInvoiceEstimateBuilder builder() {
-    return new EstimateAdvanceInvoiceEstimateBuilder();
-  }
-
-  public static final class EstimateAdvanceInvoiceEstimateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateAdvanceInvoiceEstimateBuilder() {}
-
-    public EstimateAdvanceInvoiceEstimateBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public EstimateAdvanceInvoiceEstimateBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public EstimateAdvanceInvoiceEstimateBuilder scheduleType(ScheduleType value) {
-
-      formData.put("schedule_type", value);
-
-      return this;
-    }
-
-    public EstimateAdvanceInvoiceEstimateBuilder fixedIntervalSchedule(
-        FixedIntervalScheduleParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "fixed_interval_schedule[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateAdvanceInvoiceEstimateBuilder specificDatesSchedule(
-        List<SpecificDatesScheduleParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SpecificDatesScheduleParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "specific_dates_schedule[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateAdvanceInvoiceEstimateParams build() {
-      return new EstimateAdvanceInvoiceEstimateParams(this);
-    }
-  }
-
-  public enum ScheduleType {
-    IMMEDIATE("immediate"),
-
-    SPECIFIC_DATES("specific_dates"),
-
-    FIXED_INTERVALS("fixed_intervals"),
-
-    /** An enum member indicating that ScheduleType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ScheduleType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ScheduleType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ScheduleType enumValue : ScheduleType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class FixedIntervalScheduleParams {
-
-    private final Map<String, Object> formData;
-
-    private FixedIntervalScheduleParams(FixedIntervalScheduleBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for FixedIntervalScheduleParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static FixedIntervalScheduleBuilder builder() {
-      return new FixedIntervalScheduleBuilder();
-    }
-
-    public static final class FixedIntervalScheduleBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private FixedIntervalScheduleBuilder() {}
-
-      public FixedIntervalScheduleBuilder numberOfOccurrences(Integer value) {
-
-        formData.put("number_of_occurrences", value);
-
-        return this;
-      }
-
-      public FixedIntervalScheduleBuilder daysBeforeRenewal(Integer value) {
-
-        formData.put("days_before_renewal", value);
-
-        return this;
-      }
-
-      public FixedIntervalScheduleBuilder endScheduleOn(EndScheduleOn value) {
-
-        formData.put("end_schedule_on", value);
-
-        return this;
-      }
-
-      public FixedIntervalScheduleBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public FixedIntervalScheduleParams build() {
-        return new FixedIntervalScheduleParams(this);
-      }
-    }
-
-    public enum EndScheduleOn {
-      AFTER_NUMBER_OF_INTERVALS("after_number_of_intervals"),
-
-      SPECIFIC_DATE("specific_date"),
-
-      SUBSCRIPTION_END("subscription_end"),
-
-      /** An enum member indicating that EndScheduleOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EndScheduleOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EndScheduleOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EndScheduleOn enumValue : EndScheduleOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SpecificDatesScheduleParams {
-
-    private final Map<String, Object> formData;
-
-    private SpecificDatesScheduleParams(SpecificDatesScheduleBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SpecificDatesScheduleParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SpecificDatesScheduleBuilder builder() {
-      return new SpecificDatesScheduleBuilder();
-    }
-
-    public static final class SpecificDatesScheduleBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SpecificDatesScheduleBuilder() {}
-
-      public SpecificDatesScheduleBuilder termsToCharge(Integer value) {
-
-        formData.put("terms_to_charge", value);
-
-        return this;
-      }
-
-      public SpecificDatesScheduleBuilder date(Timestamp value) {
-
-        formData.put("date", value);
-
-        return this;
-      }
-
-      public SpecificDatesScheduleParams build() {
-        return new SpecificDatesScheduleParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCancelSubscriptionForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCancelSubscriptionForItemsParams.java
deleted file mode 100644
index 00567bdd..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCancelSubscriptionForItemsParams.java
+++ /dev/null
@@ -1,405 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class EstimateCancelSubscriptionForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateCancelSubscriptionForItemsParams(
-      EstimateCancelSubscriptionForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateCancelSubscriptionForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateCancelSubscriptionForItemsBuilder builder() {
-    return new EstimateCancelSubscriptionForItemsBuilder();
-  }
-
-  public static final class EstimateCancelSubscriptionForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateCancelSubscriptionForItemsBuilder() {}
-
-    public EstimateCancelSubscriptionForItemsBuilder cancelOption(CancelOption value) {
-
-      formData.put("cancel_option", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionForItemsBuilder endOfTerm(Boolean value) {
-
-      formData.put("end_of_term", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionForItemsBuilder cancelAt(Timestamp value) {
-
-      formData.put("cancel_at", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionForItemsBuilder creditOptionForCurrentTermCharges(
-        CreditOptionForCurrentTermCharges value) {
-
-      formData.put("credit_option_for_current_term_charges", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionForItemsBuilder unbilledChargesOption(
-        UnbilledChargesOption value) {
-
-      formData.put("unbilled_charges_option", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionForItemsBuilder accountReceivablesHandling(
-        AccountReceivablesHandling value) {
-
-      formData.put("account_receivables_handling", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionForItemsBuilder refundableCreditsHandling(
-        RefundableCreditsHandling value) {
-
-      formData.put("refundable_credits_handling", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionForItemsBuilder contractTermCancelOption(
-        ContractTermCancelOption value) {
-
-      formData.put("contract_term_cancel_option", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionForItemsBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionForItemsBuilder cancelReasonCode(String value) {
-
-      formData.put("cancel_reason_code", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionForItemsBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCancelSubscriptionForItemsParams build() {
-      return new EstimateCancelSubscriptionForItemsParams(this);
-    }
-  }
-
-  public enum CancelOption {
-    IMMEDIATELY("immediately"),
-
-    END_OF_TERM("end_of_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    END_OF_BILLING_TERM("end_of_billing_term"),
-
-    /** An enum member indicating that CancelOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CancelOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CancelOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CancelOption enumValue : CancelOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum CreditOptionForCurrentTermCharges {
-    NONE("none"),
-
-    PRORATE("prorate"),
-
-    FULL("full"),
-
-    /**
-     * An enum member indicating that CreditOptionForCurrentTermCharges was instantiated with an
-     * unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    CreditOptionForCurrentTermCharges(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CreditOptionForCurrentTermCharges fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CreditOptionForCurrentTermCharges enumValue :
-          CreditOptionForCurrentTermCharges.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum UnbilledChargesOption {
-    INVOICE("invoice"),
-
-    DELETE("delete"),
-
-    /**
-     * An enum member indicating that UnbilledChargesOption was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    UnbilledChargesOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static UnbilledChargesOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (UnbilledChargesOption enumValue : UnbilledChargesOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AccountReceivablesHandling {
-    NO_ACTION("no_action"),
-
-    SCHEDULE_PAYMENT_COLLECTION("schedule_payment_collection"),
-
-    WRITE_OFF("write_off"),
-
-    /**
-     * An enum member indicating that AccountReceivablesHandling was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    AccountReceivablesHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AccountReceivablesHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AccountReceivablesHandling enumValue : AccountReceivablesHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum RefundableCreditsHandling {
-    NO_ACTION("no_action"),
-
-    SCHEDULE_REFUND("schedule_refund"),
-
-    /**
-     * An enum member indicating that RefundableCreditsHandling was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    RefundableCreditsHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static RefundableCreditsHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (RefundableCreditsHandling enumValue : RefundableCreditsHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ContractTermCancelOption {
-    TERMINATE_IMMEDIATELY("terminate_immediately"),
-
-    END_OF_CONTRACT_TERM("end_of_contract_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    END_OF_SUBSCRIPTION_BILLING_TERM("end_of_subscription_billing_term"),
-
-    /**
-     * An enum member indicating that ContractTermCancelOption was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    ContractTermCancelOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ContractTermCancelOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ContractTermCancelOption enumValue : ContractTermCancelOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCancelSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCancelSubscriptionParams.java
deleted file mode 100644
index 40347a07..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCancelSubscriptionParams.java
+++ /dev/null
@@ -1,388 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class EstimateCancelSubscriptionParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateCancelSubscriptionParams(EstimateCancelSubscriptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateCancelSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateCancelSubscriptionBuilder builder() {
-    return new EstimateCancelSubscriptionBuilder();
-  }
-
-  public static final class EstimateCancelSubscriptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateCancelSubscriptionBuilder() {}
-
-    public EstimateCancelSubscriptionBuilder cancelOption(CancelOption value) {
-
-      formData.put("cancel_option", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionBuilder endOfTerm(Boolean value) {
-
-      formData.put("end_of_term", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionBuilder cancelAt(Timestamp value) {
-
-      formData.put("cancel_at", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionBuilder creditOptionForCurrentTermCharges(
-        CreditOptionForCurrentTermCharges value) {
-
-      formData.put("credit_option_for_current_term_charges", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionBuilder unbilledChargesOption(UnbilledChargesOption value) {
-
-      formData.put("unbilled_charges_option", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionBuilder accountReceivablesHandling(
-        AccountReceivablesHandling value) {
-
-      formData.put("account_receivables_handling", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionBuilder refundableCreditsHandling(
-        RefundableCreditsHandling value) {
-
-      formData.put("refundable_credits_handling", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionBuilder contractTermCancelOption(
-        ContractTermCancelOption value) {
-
-      formData.put("contract_term_cancel_option", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionBuilder cancelReasonCode(String value) {
-
-      formData.put("cancel_reason_code", value);
-
-      return this;
-    }
-
-    public EstimateCancelSubscriptionBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCancelSubscriptionParams build() {
-      return new EstimateCancelSubscriptionParams(this);
-    }
-  }
-
-  public enum CancelOption {
-    IMMEDIATELY("immediately"),
-
-    END_OF_TERM("end_of_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    END_OF_BILLING_TERM("end_of_billing_term"),
-
-    /** An enum member indicating that CancelOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CancelOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CancelOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CancelOption enumValue : CancelOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum CreditOptionForCurrentTermCharges {
-    NONE("none"),
-
-    PRORATE("prorate"),
-
-    FULL("full"),
-
-    /**
-     * An enum member indicating that CreditOptionForCurrentTermCharges was instantiated with an
-     * unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    CreditOptionForCurrentTermCharges(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CreditOptionForCurrentTermCharges fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CreditOptionForCurrentTermCharges enumValue :
-          CreditOptionForCurrentTermCharges.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum UnbilledChargesOption {
-    INVOICE("invoice"),
-
-    DELETE("delete"),
-
-    /**
-     * An enum member indicating that UnbilledChargesOption was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    UnbilledChargesOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static UnbilledChargesOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (UnbilledChargesOption enumValue : UnbilledChargesOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AccountReceivablesHandling {
-    NO_ACTION("no_action"),
-
-    SCHEDULE_PAYMENT_COLLECTION("schedule_payment_collection"),
-
-    WRITE_OFF("write_off"),
-
-    /**
-     * An enum member indicating that AccountReceivablesHandling was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    AccountReceivablesHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AccountReceivablesHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AccountReceivablesHandling enumValue : AccountReceivablesHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum RefundableCreditsHandling {
-    NO_ACTION("no_action"),
-
-    SCHEDULE_REFUND("schedule_refund"),
-
-    /**
-     * An enum member indicating that RefundableCreditsHandling was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    RefundableCreditsHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static RefundableCreditsHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (RefundableCreditsHandling enumValue : RefundableCreditsHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ContractTermCancelOption {
-    TERMINATE_IMMEDIATELY("terminate_immediately"),
-
-    END_OF_CONTRACT_TERM("end_of_contract_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    END_OF_SUBSCRIPTION_BILLING_TERM("end_of_subscription_billing_term"),
-
-    /**
-     * An enum member indicating that ContractTermCancelOption was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    ContractTermCancelOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ContractTermCancelOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ContractTermCancelOption enumValue : ContractTermCancelOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateChangeTermEndParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateChangeTermEndParams.java
deleted file mode 100644
index b7822a61..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateChangeTermEndParams.java
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class EstimateChangeTermEndParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateChangeTermEndParams(EstimateChangeTermEndBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateChangeTermEndParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateChangeTermEndBuilder builder() {
-    return new EstimateChangeTermEndBuilder();
-  }
-
-  public static final class EstimateChangeTermEndBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateChangeTermEndBuilder() {}
-
-    public EstimateChangeTermEndBuilder termEndsAt(Timestamp value) {
-
-      formData.put("term_ends_at", value);
-
-      return this;
-    }
-
-    public EstimateChangeTermEndBuilder prorate(Boolean value) {
-
-      formData.put("prorate", value);
-
-      return this;
-    }
-
-    public EstimateChangeTermEndBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public EstimateChangeTermEndParams build() {
-      return new EstimateChangeTermEndParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateInvoiceForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateInvoiceForItemsParams.java
deleted file mode 100644
index 0c022407..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateInvoiceForItemsParams.java
+++ /dev/null
@@ -1,1175 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class EstimateCreateInvoiceForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateCreateInvoiceForItemsParams(EstimateCreateInvoiceForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateCreateInvoiceForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateCreateInvoiceForItemsBuilder builder() {
-    return new EstimateCreateInvoiceForItemsBuilder();
-  }
-
-  public static final class EstimateCreateInvoiceForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateCreateInvoiceForItemsBuilder() {}
-
-    public EstimateCreateInvoiceForItemsBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder invoiceNote(String value) {
-
-      formData.put("invoice_note", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder removeGeneralNote(Boolean value) {
-
-      formData.put("remove_general_note", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public EstimateCreateInvoiceForItemsBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder authorizationTransactionId(String value) {
-
-      formData.put("authorization_transaction_id", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder invoice(InvoiceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "invoice[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder itemPrices(List<ItemPricesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemPricesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_prices[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder charges(List<ChargesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder notesToRemove(List<NotesToRemoveParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          NotesToRemoveParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "notes_to_remove[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsBuilder taxProvidersFields(
-        List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceForItemsParams build() {
-      return new EstimateCreateInvoiceForItemsParams(this);
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class InvoiceParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceParams(InvoiceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceBuilder builder() {
-      return new InvoiceBuilder();
-    }
-
-    public static final class InvoiceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceBuilder() {}
-
-      public InvoiceBuilder customerId(String value) {
-
-        formData.put("customer_id", value);
-
-        return this;
-      }
-
-      public InvoiceBuilder subscriptionId(String value) {
-
-        formData.put("subscription_id", value);
-
-        return this;
-      }
-
-      public InvoiceBuilder poNumber(String value) {
-
-        formData.put("po_number", value);
-
-        return this;
-      }
-
-      public InvoiceParams build() {
-        return new InvoiceParams(this);
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemPricesParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemPricesParams(ItemPricesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemPricesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemPricesBuilder builder() {
-      return new ItemPricesBuilder();
-    }
-
-    public static final class ItemPricesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemPricesBuilder() {}
-
-      public ItemPricesBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ItemPricesParams build() {
-        return new ItemPricesParams(this);
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChargesParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargesParams(ChargesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargesBuilder builder() {
-      return new ChargesBuilder();
-    }
-
-    public static final class ChargesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargesBuilder() {}
-
-      public ChargesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public ChargesBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public ChargesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxable(Boolean value) {
-
-        formData.put("taxable", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxProfileId(String value) {
-
-        formData.put("tax_profile_id", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTaxCode(String value) {
-
-        formData.put("avalara_tax_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder hsnCode(String value) {
-
-        formData.put("hsn_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxjarProductCode(String value) {
-
-        formData.put("taxjar_product_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ChargesParams build() {
-        return new ChargesParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class NotesToRemoveParams {
-
-    private final Map<String, Object> formData;
-
-    private NotesToRemoveParams(NotesToRemoveBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NotesToRemoveParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NotesToRemoveBuilder builder() {
-      return new NotesToRemoveBuilder();
-    }
-
-    public static final class NotesToRemoveBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NotesToRemoveBuilder() {}
-
-      public NotesToRemoveBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public NotesToRemoveBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public NotesToRemoveParams build() {
-        return new NotesToRemoveParams(this);
-      }
-    }
-
-    public enum EntityType {
-      CUSTOMER("customer"),
-
-      SUBSCRIPTION("subscription"),
-
-      COUPON("coupon"),
-
-      PLAN_ITEM_PRICE("plan_item_price"),
-
-      ADDON_ITEM_PRICE("addon_item_price"),
-
-      CHARGE_ITEM_PRICE("charge_item_price"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateInvoiceParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateInvoiceParams.java
deleted file mode 100644
index 9f72a2be..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateInvoiceParams.java
+++ /dev/null
@@ -1,795 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class EstimateCreateInvoiceParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateCreateInvoiceParams(EstimateCreateInvoiceBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateCreateInvoiceParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateCreateInvoiceBuilder builder() {
-    return new EstimateCreateInvoiceBuilder();
-  }
-
-  public static final class EstimateCreateInvoiceBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateCreateInvoiceBuilder() {}
-
-    public EstimateCreateInvoiceBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceBuilder invoiceNote(String value) {
-
-      formData.put("invoice_note", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceBuilder removeGeneralNote(Boolean value) {
-
-      formData.put("remove_general_note", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public EstimateCreateInvoiceBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceBuilder authorizationTransactionId(String value) {
-
-      formData.put("authorization_transaction_id", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public EstimateCreateInvoiceBuilder invoice(InvoiceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "invoice[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceBuilder charges(List<ChargesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceBuilder notesToRemove(List<NotesToRemoveParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          NotesToRemoveParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "notes_to_remove[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateInvoiceParams build() {
-      return new EstimateCreateInvoiceParams(this);
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class InvoiceParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceParams(InvoiceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceBuilder builder() {
-      return new InvoiceBuilder();
-    }
-
-    public static final class InvoiceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceBuilder() {}
-
-      public InvoiceBuilder customerId(String value) {
-
-        formData.put("customer_id", value);
-
-        return this;
-      }
-
-      public InvoiceBuilder subscriptionId(String value) {
-
-        formData.put("subscription_id", value);
-
-        return this;
-      }
-
-      public InvoiceBuilder poNumber(String value) {
-
-        formData.put("po_number", value);
-
-        return this;
-      }
-
-      public InvoiceParams build() {
-        return new InvoiceParams(this);
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public AddonsBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class ChargesParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargesParams(ChargesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargesBuilder builder() {
-      return new ChargesBuilder();
-    }
-
-    public static final class ChargesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargesBuilder() {}
-
-      public ChargesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public ChargesBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public ChargesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxable(Boolean value) {
-
-        formData.put("taxable", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxProfileId(String value) {
-
-        formData.put("tax_profile_id", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTaxCode(String value) {
-
-        formData.put("avalara_tax_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder hsnCode(String value) {
-
-        formData.put("hsn_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxjarProductCode(String value) {
-
-        formData.put("taxjar_product_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ChargesParams build() {
-        return new ChargesParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class NotesToRemoveParams {
-
-    private final Map<String, Object> formData;
-
-    private NotesToRemoveParams(NotesToRemoveBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NotesToRemoveParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NotesToRemoveBuilder builder() {
-      return new NotesToRemoveBuilder();
-    }
-
-    public static final class NotesToRemoveBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NotesToRemoveBuilder() {}
-
-      public NotesToRemoveBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public NotesToRemoveBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public NotesToRemoveParams build() {
-        return new NotesToRemoveParams(this);
-      }
-    }
-
-    public enum EntityType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CUSTOMER("customer"),
-
-      SUBSCRIPTION("subscription"),
-
-      COUPON("coupon"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateSubForCustomerEstimateParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateSubForCustomerEstimateParams.java
deleted file mode 100644
index 7c799271..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateSubForCustomerEstimateParams.java
+++ /dev/null
@@ -1,901 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.sql.Timestamp;
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class EstimateCreateSubForCustomerEstimateParams {
-
-  private final Map<String, Object> queryParams;
-
-  private EstimateCreateSubForCustomerEstimateParams(
-      EstimateCreateSubForCustomerEstimateBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public EstimateCreateSubForCustomerEstimateBuilder toBuilder() {
-    EstimateCreateSubForCustomerEstimateBuilder builder =
-        new EstimateCreateSubForCustomerEstimateBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for EstimateCreateSubForCustomerEstimateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateCreateSubForCustomerEstimateBuilder builder() {
-    return new EstimateCreateSubForCustomerEstimateBuilder();
-  }
-
-  public static final class EstimateCreateSubForCustomerEstimateBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private EstimateCreateSubForCustomerEstimateBuilder() {}
-
-    public EstimateCreateSubForCustomerEstimateBuilder useExistingBalances(Boolean value) {
-      queryParams.put("use_existing_balances", value);
-      return this;
-    }
-
-    public EstimateCreateSubForCustomerEstimateBuilder invoiceImmediately(Boolean value) {
-      queryParams.put("invoice_immediately", value);
-      return this;
-    }
-
-    public EstimateCreateSubForCustomerEstimateBuilder billingCycles(Integer value) {
-      queryParams.put("billing_cycles", value);
-      return this;
-    }
-
-    public EstimateCreateSubForCustomerEstimateBuilder mandatoryAddonsToRemove(List<String> value) {
-      queryParams.put("mandatory_addons_to_remove", value);
-      return this;
-    }
-
-    public EstimateCreateSubForCustomerEstimateBuilder termsToCharge(Integer value) {
-      queryParams.put("terms_to_charge", value);
-      return this;
-    }
-
-    public EstimateCreateSubForCustomerEstimateBuilder billingAlignmentMode(
-        BillingAlignmentMode value) {
-      queryParams.put("billing_alignment_mode", value);
-      return this;
-    }
-
-    public EstimateCreateSubForCustomerEstimateBuilder invoiceDate(Timestamp value) {
-      queryParams.put("invoice_date", value);
-      return this;
-    }
-
-    public EstimateCreateSubForCustomerEstimateBuilder couponIds(List<String> value) {
-      queryParams.put("coupon_ids", value);
-      return this;
-    }
-
-    public EstimateCreateSubForCustomerEstimateBuilder subscription(SubscriptionParams value) {
-      queryParams.put("subscription", value);
-      return this;
-    }
-
-    public EstimateCreateSubForCustomerEstimateBuilder shippingAddress(
-        ShippingAddressParams value) {
-      queryParams.put("shipping_address", value);
-      return this;
-    }
-
-    public EstimateCreateSubForCustomerEstimateBuilder contractTerm(ContractTermParams value) {
-      queryParams.put("contract_term", value);
-      return this;
-    }
-
-    public EstimateCreateSubForCustomerEstimateBuilder addons(AddonsParams value) {
-      queryParams.put("addons", value);
-      return this;
-    }
-
-    public EstimateCreateSubForCustomerEstimateBuilder eventBasedAddons(
-        EventBasedAddonsParams value) {
-      queryParams.put("event_based_addons", value);
-      return this;
-    }
-
-    public EstimateCreateSubForCustomerEstimateParams build() {
-      return new EstimateCreateSubForCustomerEstimateParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum SubscriptionOfflinePaymentMethod {
-    NO_PREFERENCE("no_preference"),
-
-    CASH("cash"),
-
-    CHECK("check"),
-
-    BANK_TRANSFER("bank_transfer"),
-
-    ACH_CREDIT("ach_credit"),
-
-    SEPA_CREDIT("sepa_credit"),
-
-    BOLETO("boleto"),
-
-    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-    CUSTOM("custom"),
-
-    /**
-     * An enum member indicating that SubscriptionOfflinePaymentMethod was instantiated with an
-     * unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    SubscriptionOfflinePaymentMethod(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static SubscriptionOfflinePaymentMethod fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (SubscriptionOfflinePaymentMethod enumValue : SubscriptionOfflinePaymentMethod.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum SubscriptionFreePeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /**
-     * An enum member indicating that SubscriptionFreePeriodUnit was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    SubscriptionFreePeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static SubscriptionFreePeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (SubscriptionFreePeriodUnit enumValue : SubscriptionFreePeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum SubscriptionTrialEndAction {
-    SITE_DEFAULT("site_default"),
-
-    PLAN_DEFAULT("plan_default"),
-
-    ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-    CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-    /**
-     * An enum member indicating that SubscriptionTrialEndAction was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    SubscriptionTrialEndAction(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static SubscriptionTrialEndAction fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (SubscriptionTrialEndAction enumValue : SubscriptionTrialEndAction.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ShippingAddressValidationStatus {
-    NOT_VALIDATED("not_validated"),
-
-    VALID("valid"),
-
-    PARTIALLY_VALID("partially_valid"),
-
-    INVALID("invalid"),
-
-    /**
-     * An enum member indicating that ShippingAddressValidationStatus was instantiated with an
-     * unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    ShippingAddressValidationStatus(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ShippingAddressValidationStatus fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ShippingAddressValidationStatus enumValue : ShippingAddressValidationStatus.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ContractTermActionAtTermEnd {
-    RENEW("renew"),
-
-    EVERGREEN("evergreen"),
-
-    CANCEL("cancel"),
-
-    /**
-     * An enum member indicating that ContractTermActionAtTermEnd was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    ContractTermActionAtTermEnd(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ContractTermActionAtTermEnd fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ContractTermActionAtTermEnd enumValue : ContractTermActionAtTermEnd.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> queryParams;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-    }
-
-    /** Get the query parameters for this request. */
-    public Map<String, Object> toQueryParams() {
-      return queryParams;
-    }
-
-    public SubscriptionBuilder toBuilder() {
-      SubscriptionBuilder builder = new SubscriptionBuilder();
-      builder.queryParams.putAll(queryParams);
-      return builder;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-        queryParams.put("id", value);
-        return this;
-      }
-
-      public SubscriptionBuilder planId(String value) {
-        queryParams.put("plan_id", value);
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantity(Integer value) {
-        queryParams.put("plan_quantity", value);
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantityInDecimal(String value) {
-        queryParams.put("plan_quantity_in_decimal", value);
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPrice(Long value) {
-        queryParams.put("plan_unit_price", value);
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
-        queryParams.put("plan_unit_price_in_decimal", value);
-        return this;
-      }
-
-      public SubscriptionBuilder setupFee(Long value) {
-        queryParams.put("setup_fee", value);
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-        queryParams.put("trial_end", value);
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-        queryParams.put("start_date", value);
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-        queryParams.put("offline_payment_method", value);
-        return this;
-      }
-
-      public SubscriptionBuilder freePeriod(Integer value) {
-        queryParams.put("free_period", value);
-        return this;
-      }
-
-      public SubscriptionBuilder freePeriodUnit(FreePeriodUnit value) {
-        queryParams.put("free_period_unit", value);
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-        queryParams.put("contract_term_billing_cycle_on_renewal", value);
-        return this;
-      }
-
-      public SubscriptionBuilder trialEndAction(TrialEndAction value) {
-        queryParams.put("trial_end_action", value);
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum FreePeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      FreePeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static FreePeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum TrialEndAction {
-      SITE_DEFAULT("site_default"),
-
-      PLAN_DEFAULT("plan_default"),
-
-      ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-      CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-      /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      TrialEndAction(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static TrialEndAction fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (TrialEndAction enumValue : TrialEndAction.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> queryParams;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-    }
-
-    /** Get the query parameters for this request. */
-    public Map<String, Object> toQueryParams() {
-      return queryParams;
-    }
-
-    public ShippingAddressBuilder toBuilder() {
-      ShippingAddressBuilder builder = new ShippingAddressBuilder();
-      builder.queryParams.putAll(queryParams);
-      return builder;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder line1(String value) {
-        queryParams.put("line1", value);
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-        queryParams.put("line2", value);
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-        queryParams.put("line3", value);
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-        queryParams.put("city", value);
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-        queryParams.put("state_code", value);
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-        queryParams.put("zip", value);
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-        queryParams.put("country", value);
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-        queryParams.put("validation_status", value);
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> queryParams;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-    }
-
-    /** Get the query parameters for this request. */
-    public Map<String, Object> toQueryParams() {
-      return queryParams;
-    }
-
-    public ContractTermBuilder toBuilder() {
-      ContractTermBuilder builder = new ContractTermBuilder();
-      builder.queryParams.putAll(queryParams);
-      return builder;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-        queryParams.put("action_at_term_end", value);
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-        queryParams.put("cancellation_cutoff_period", value);
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> queryParams;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-    }
-
-    /** Get the query parameters for this request. */
-    public Map<String, Object> toQueryParams() {
-      return queryParams;
-    }
-
-    public AddonsBuilder toBuilder() {
-      AddonsBuilder builder = new AddonsBuilder();
-      builder.queryParams.putAll(queryParams);
-      return builder;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(List<String> value) {
-        queryParams.put("id", value);
-        return this;
-      }
-
-      public AddonsBuilder quantity(List<Integer> value) {
-        queryParams.put("quantity", value);
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(List<String> value) {
-        queryParams.put("quantity_in_decimal", value);
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(List<Integer> value) {
-        queryParams.put("unit_price", value);
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(List<String> value) {
-        queryParams.put("unit_price_in_decimal", value);
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(List<Integer> value) {
-        queryParams.put("billing_cycles", value);
-        return this;
-      }
-
-      public AddonsBuilder trialEnd(List<Integer> value) {
-        queryParams.put("trial_end", value);
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> queryParams;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-    }
-
-    /** Get the query parameters for this request. */
-    public Map<String, Object> toQueryParams() {
-      return queryParams;
-    }
-
-    public EventBasedAddonsBuilder toBuilder() {
-      EventBasedAddonsBuilder builder = new EventBasedAddonsBuilder();
-      builder.queryParams.putAll(queryParams);
-      return builder;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(List<String> value) {
-        queryParams.put("id", value);
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(List<Integer> value) {
-        queryParams.put("quantity", value);
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(List<Integer> value) {
-        queryParams.put("unit_price", value);
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(List<String> value) {
-        queryParams.put("quantity_in_decimal", value);
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(List<String> value) {
-        queryParams.put("unit_price_in_decimal", value);
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(List<Integer> value) {
-        queryParams.put("service_period_in_days", value);
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(List<String> value) {
-        queryParams.put("on_event", value);
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(List<Boolean> value) {
-        queryParams.put("charge_once", value);
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOn(List<String> value) {
-        queryParams.put("charge_on", value);
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateSubItemEstimateParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateSubItemEstimateParams.java
deleted file mode 100644
index a918dd3e..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateSubItemEstimateParams.java
+++ /dev/null
@@ -1,1560 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class EstimateCreateSubItemEstimateParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateCreateSubItemEstimateParams(EstimateCreateSubItemEstimateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateCreateSubItemEstimateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateCreateSubItemEstimateBuilder builder() {
-    return new EstimateCreateSubItemEstimateBuilder();
-  }
-
-  public static final class EstimateCreateSubItemEstimateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateCreateSubItemEstimateBuilder() {}
-
-    public EstimateCreateSubItemEstimateBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder mandatoryItemsToRemove(List<String> value) {
-
-      formData.put("mandatory_items_to_remove", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder clientProfileId(String value) {
-
-      formData.put("client_profile_id", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateBuilder taxProvidersFields(
-        List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateParams build() {
-      return new EstimateCreateSubItemEstimateParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder coupon(String value) {
-
-        formData.put("coupon", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder freePeriod(Integer value) {
-
-        formData.put("free_period", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder freePeriodUnit(FreePeriodUnit value) {
-
-        formData.put("free_period_unit", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEndAction(TrialEndAction value) {
-
-        formData.put("trial_end_action", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum FreePeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      FreePeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static FreePeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum TrialEndAction {
-      SITE_DEFAULT("site_default"),
-
-      PLAN_DEFAULT("plan_default"),
-
-      ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-      CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-      /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      TrialEndAction(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static TrialEndAction fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (TrialEndAction enumValue : TrialEndAction.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder registeredForGst(Boolean value) {
-
-        formData.put("registered_for_gst", value);
-
-        return this;
-      }
-
-      public CustomerBuilder taxability(Taxability value) {
-
-        formData.put("taxability", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityCode(EntityCode value) {
-
-        formData.put("entity_code", value);
-
-        return this;
-      }
-
-      public CustomerBuilder exemptNumber(String value) {
-
-        formData.put("exempt_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder exemptionDetails(List<Object> value) {
-
-        formData.put("exemption_details", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CustomerBuilder customerType(CustomerType value) {
-
-        formData.put("customer_type", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-
-    public enum Taxability {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Taxability was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Taxability(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Taxability fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Taxability enumValue : Taxability.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum EntityCode {
-      A("a"),
-
-      B("b"),
-
-      C("c"),
-
-      D("d"),
-
-      E("e"),
-
-      F("f"),
-
-      G("g"),
-
-      H("h"),
-
-      I("i"),
-
-      J("j"),
-
-      K("k"),
-
-      L("l"),
-
-      M("m"),
-
-      N("n"),
-
-      P("p"),
-
-      Q("q"),
-
-      R("r"),
-
-      MED_1("med1"),
-
-      MED_2("med2"),
-
-      /** An enum member indicating that EntityCode was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityCode(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityCode fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityCode enumValue : EntityCode.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum CustomerType {
-      RESIDENTIAL("residential"),
-
-      BUSINESS("business"),
-
-      SENIOR_CITIZEN("senior_citizen"),
-
-      INDUSTRIAL("industrial"),
-
-      /** An enum member indicating that CustomerType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      CustomerType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static CustomerType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (CustomerType enumValue : CustomerType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public ContractTermBuilder contractStart(Timestamp value) {
-
-        formData.put("contract_start", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateSubItemForCustomerEstimateParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateSubItemForCustomerEstimateParams.java
deleted file mode 100644
index 6a0839f5..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateSubItemForCustomerEstimateParams.java
+++ /dev/null
@@ -1,1325 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class EstimateCreateSubItemForCustomerEstimateParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateCreateSubItemForCustomerEstimateParams(
-      EstimateCreateSubItemForCustomerEstimateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateCreateSubItemForCustomerEstimateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateCreateSubItemForCustomerEstimateBuilder builder() {
-    return new EstimateCreateSubItemForCustomerEstimateBuilder();
-  }
-
-  public static final class EstimateCreateSubItemForCustomerEstimateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateCreateSubItemForCustomerEstimateBuilder() {}
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder useExistingBalances(Boolean value) {
-
-      formData.put("use_existing_balances", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder mandatoryItemsToRemove(
-        List<String> value) {
-
-      formData.put("mandatory_items_to_remove", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder billingAlignmentMode(
-        BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder shippingAddress(
-        ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder billingAddress(
-        BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder billingOverride(
-        BillingOverrideParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_override[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateParams build() {
-      return new EstimateCreateSubItemForCustomerEstimateParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder freePeriod(Integer value) {
-
-        formData.put("free_period", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder freePeriodUnit(FreePeriodUnit value) {
-
-        formData.put("free_period_unit", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEndAction(TrialEndAction value) {
-
-        formData.put("trial_end_action", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum FreePeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      FreePeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static FreePeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum TrialEndAction {
-      SITE_DEFAULT("site_default"),
-
-      PLAN_DEFAULT("plan_default"),
-
-      ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-      CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-      /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      TrialEndAction(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static TrialEndAction fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (TrialEndAction enumValue : TrialEndAction.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public ContractTermBuilder contractStart(Timestamp value) {
-
-        formData.put("contract_start", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingOverrideParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingOverrideParams(BillingOverrideBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingOverrideParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingOverrideBuilder builder() {
-      return new BillingOverrideBuilder();
-    }
-
-    public static final class BillingOverrideBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingOverrideBuilder() {}
-
-      public BillingOverrideBuilder maxExcessPaymentUsage(Long value) {
-
-        formData.put("max_excess_payment_usage", value);
-
-        return this;
-      }
-
-      public BillingOverrideBuilder maxRefundableCreditsUsage(Long value) {
-
-        formData.put("max_refundable_credits_usage", value);
-
-        return this;
-      }
-
-      public BillingOverrideParams build() {
-        return new BillingOverrideParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateSubscriptionParams.java
deleted file mode 100644
index 47323a45..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateCreateSubscriptionParams.java
+++ /dev/null
@@ -1,1291 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class EstimateCreateSubscriptionParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateCreateSubscriptionParams(EstimateCreateSubscriptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateCreateSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateCreateSubscriptionBuilder builder() {
-    return new EstimateCreateSubscriptionBuilder();
-  }
-
-  public static final class EstimateCreateSubscriptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateCreateSubscriptionBuilder() {}
-
-    public EstimateCreateSubscriptionBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder mandatoryAddonsToRemove(List<String> value) {
-
-      formData.put("mandatory_addons_to_remove", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder clientProfileId(String value) {
-
-      formData.put("client_profile_id", value);
-
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubscriptionBuilder taxProvidersFields(
-        List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateCreateSubscriptionParams build() {
-      return new EstimateCreateSubscriptionParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planId(String value) {
-
-        formData.put("plan_id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantity(Integer value) {
-
-        formData.put("plan_quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantityInDecimal(String value) {
-
-        formData.put("plan_quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPrice(Long value) {
-
-        formData.put("plan_unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
-
-        formData.put("plan_unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder coupon(String value) {
-
-        formData.put("coupon", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder freePeriod(Integer value) {
-
-        formData.put("free_period", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder freePeriodUnit(FreePeriodUnit value) {
-
-        formData.put("free_period_unit", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEndAction(TrialEndAction value) {
-
-        formData.put("trial_end_action", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum FreePeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      FreePeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static FreePeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum TrialEndAction {
-      SITE_DEFAULT("site_default"),
-
-      PLAN_DEFAULT("plan_default"),
-
-      ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-      CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-      /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      TrialEndAction(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static TrialEndAction fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (TrialEndAction enumValue : TrialEndAction.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder registeredForGst(Boolean value) {
-
-        formData.put("registered_for_gst", value);
-
-        return this;
-      }
-
-      public CustomerBuilder taxability(Taxability value) {
-
-        formData.put("taxability", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityCode(EntityCode value) {
-
-        formData.put("entity_code", value);
-
-        return this;
-      }
-
-      public CustomerBuilder exemptNumber(String value) {
-
-        formData.put("exempt_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder exemptionDetails(List<Object> value) {
-
-        formData.put("exemption_details", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CustomerBuilder customerType(CustomerType value) {
-
-        formData.put("customer_type", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-
-    public enum Taxability {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Taxability was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Taxability(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Taxability fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Taxability enumValue : Taxability.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum EntityCode {
-      A("a"),
-
-      B("b"),
-
-      C("c"),
-
-      D("d"),
-
-      E("e"),
-
-      F("f"),
-
-      G("g"),
-
-      H("h"),
-
-      I("i"),
-
-      J("j"),
-
-      K("k"),
-
-      L("l"),
-
-      M("m"),
-
-      N("n"),
-
-      P("p"),
-
-      Q("q"),
-
-      R("r"),
-
-      MED_1("med1"),
-
-      MED_2("med2"),
-
-      /** An enum member indicating that EntityCode was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityCode(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityCode fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityCode enumValue : EntityCode.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum CustomerType {
-      RESIDENTIAL("residential"),
-
-      BUSINESS("business"),
-
-      SENIOR_CITIZEN("senior_citizen"),
-
-      INDUSTRIAL("industrial"),
-
-      /** An enum member indicating that CustomerType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      CustomerType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static CustomerType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (CustomerType enumValue : CustomerType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AddonsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
-
-        formData.put("charge_on", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOn {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOn enumValue : ChargeOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateGiftSubscriptionForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateGiftSubscriptionForItemsParams.java
deleted file mode 100644
index a70a1f59..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateGiftSubscriptionForItemsParams.java
+++ /dev/null
@@ -1,658 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class EstimateGiftSubscriptionForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateGiftSubscriptionForItemsParams(EstimateGiftSubscriptionForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateGiftSubscriptionForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateGiftSubscriptionForItemsBuilder builder() {
-    return new EstimateGiftSubscriptionForItemsBuilder();
-  }
-
-  public static final class EstimateGiftSubscriptionForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateGiftSubscriptionForItemsBuilder() {}
-
-    public EstimateGiftSubscriptionForItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public EstimateGiftSubscriptionForItemsBuilder gift(GiftParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "gift[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateGiftSubscriptionForItemsBuilder gifter(GifterParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "gifter[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateGiftSubscriptionForItemsBuilder giftReceiver(GiftReceiverParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "gift_receiver[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateGiftSubscriptionForItemsBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateGiftSubscriptionForItemsBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateGiftSubscriptionForItemsBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateGiftSubscriptionForItemsParams build() {
-      return new EstimateGiftSubscriptionForItemsParams(this);
-    }
-  }
-
-  public static final class GiftParams {
-
-    private final Map<String, Object> formData;
-
-    private GiftParams(GiftBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GiftParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GiftBuilder builder() {
-      return new GiftBuilder();
-    }
-
-    public static final class GiftBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GiftBuilder() {}
-
-      public GiftBuilder scheduledAt(Timestamp value) {
-
-        formData.put("scheduled_at", value);
-
-        return this;
-      }
-
-      public GiftBuilder autoClaim(Boolean value) {
-
-        formData.put("auto_claim", value);
-
-        return this;
-      }
-
-      public GiftBuilder noExpiry(Boolean value) {
-
-        formData.put("no_expiry", value);
-
-        return this;
-      }
-
-      public GiftBuilder claimExpiryDate(Timestamp value) {
-
-        formData.put("claim_expiry_date", value);
-
-        return this;
-      }
-
-      public GiftParams build() {
-        return new GiftParams(this);
-      }
-    }
-  }
-
-  public static final class GifterParams {
-
-    private final Map<String, Object> formData;
-
-    private GifterParams(GifterBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GifterParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GifterBuilder builder() {
-      return new GifterBuilder();
-    }
-
-    public static final class GifterBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GifterBuilder() {}
-
-      public GifterBuilder customerId(String value) {
-
-        formData.put("customer_id", value);
-
-        return this;
-      }
-
-      public GifterBuilder signature(String value) {
-
-        formData.put("signature", value);
-
-        return this;
-      }
-
-      public GifterBuilder note(String value) {
-
-        formData.put("note", value);
-
-        return this;
-      }
-
-      public GifterBuilder paymentSrcId(String value) {
-
-        formData.put("payment_src_id", value);
-
-        return this;
-      }
-
-      public GifterParams build() {
-        return new GifterParams(this);
-      }
-    }
-  }
-
-  public static final class GiftReceiverParams {
-
-    private final Map<String, Object> formData;
-
-    private GiftReceiverParams(GiftReceiverBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GiftReceiverParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GiftReceiverBuilder builder() {
-      return new GiftReceiverBuilder();
-    }
-
-    public static final class GiftReceiverBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GiftReceiverBuilder() {}
-
-      public GiftReceiverBuilder customerId(String value) {
-
-        formData.put("customer_id", value);
-
-        return this;
-      }
-
-      public GiftReceiverBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public GiftReceiverBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public GiftReceiverBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public GiftReceiverParams build() {
-        return new GiftReceiverParams(this);
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateGiftSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateGiftSubscriptionParams.java
deleted file mode 100644
index 71c74b53..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateGiftSubscriptionParams.java
+++ /dev/null
@@ -1,719 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class EstimateGiftSubscriptionParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateGiftSubscriptionParams(EstimateGiftSubscriptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateGiftSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateGiftSubscriptionBuilder builder() {
-    return new EstimateGiftSubscriptionBuilder();
-  }
-
-  public static final class EstimateGiftSubscriptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateGiftSubscriptionBuilder() {}
-
-    public EstimateGiftSubscriptionBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public EstimateGiftSubscriptionBuilder gift(GiftParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "gift[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateGiftSubscriptionBuilder gifter(GifterParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "gifter[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateGiftSubscriptionBuilder giftReceiver(GiftReceiverParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "gift_receiver[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateGiftSubscriptionBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateGiftSubscriptionBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateGiftSubscriptionBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateGiftSubscriptionBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateGiftSubscriptionParams build() {
-      return new EstimateGiftSubscriptionParams(this);
-    }
-  }
-
-  public static final class GiftParams {
-
-    private final Map<String, Object> formData;
-
-    private GiftParams(GiftBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GiftParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GiftBuilder builder() {
-      return new GiftBuilder();
-    }
-
-    public static final class GiftBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GiftBuilder() {}
-
-      public GiftBuilder scheduledAt(Timestamp value) {
-
-        formData.put("scheduled_at", value);
-
-        return this;
-      }
-
-      public GiftBuilder autoClaim(Boolean value) {
-
-        formData.put("auto_claim", value);
-
-        return this;
-      }
-
-      public GiftBuilder noExpiry(Boolean value) {
-
-        formData.put("no_expiry", value);
-
-        return this;
-      }
-
-      public GiftBuilder claimExpiryDate(Timestamp value) {
-
-        formData.put("claim_expiry_date", value);
-
-        return this;
-      }
-
-      public GiftParams build() {
-        return new GiftParams(this);
-      }
-    }
-  }
-
-  public static final class GifterParams {
-
-    private final Map<String, Object> formData;
-
-    private GifterParams(GifterBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GifterParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GifterBuilder builder() {
-      return new GifterBuilder();
-    }
-
-    public static final class GifterBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GifterBuilder() {}
-
-      public GifterBuilder customerId(String value) {
-
-        formData.put("customer_id", value);
-
-        return this;
-      }
-
-      public GifterBuilder signature(String value) {
-
-        formData.put("signature", value);
-
-        return this;
-      }
-
-      public GifterBuilder note(String value) {
-
-        formData.put("note", value);
-
-        return this;
-      }
-
-      public GifterBuilder paymentSrcId(String value) {
-
-        formData.put("payment_src_id", value);
-
-        return this;
-      }
-
-      public GifterParams build() {
-        return new GifterParams(this);
-      }
-    }
-  }
-
-  public static final class GiftReceiverParams {
-
-    private final Map<String, Object> formData;
-
-    private GiftReceiverParams(GiftReceiverBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GiftReceiverParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GiftReceiverBuilder builder() {
-      return new GiftReceiverBuilder();
-    }
-
-    public static final class GiftReceiverBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GiftReceiverBuilder() {}
-
-      public GiftReceiverBuilder customerId(String value) {
-
-        formData.put("customer_id", value);
-
-        return this;
-      }
-
-      public GiftReceiverBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public GiftReceiverBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public GiftReceiverBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public GiftReceiverParams build() {
-        return new GiftReceiverParams(this);
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder planId(String value) {
-
-        formData.put("plan_id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantity(Integer value) {
-
-        formData.put("plan_quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantityInDecimal(String value) {
-
-        formData.put("plan_quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimatePauseSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimatePauseSubscriptionParams.java
deleted file mode 100644
index 5bcef4b9..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimatePauseSubscriptionParams.java
+++ /dev/null
@@ -1,183 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class EstimatePauseSubscriptionParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimatePauseSubscriptionParams(EstimatePauseSubscriptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimatePauseSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimatePauseSubscriptionBuilder builder() {
-    return new EstimatePauseSubscriptionBuilder();
-  }
-
-  public static final class EstimatePauseSubscriptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimatePauseSubscriptionBuilder() {}
-
-    public EstimatePauseSubscriptionBuilder pauseOption(PauseOption value) {
-
-      formData.put("pause_option", value);
-
-      return this;
-    }
-
-    public EstimatePauseSubscriptionBuilder unbilledChargesHandling(UnbilledChargesHandling value) {
-
-      formData.put("unbilled_charges_handling", value);
-
-      return this;
-    }
-
-    public EstimatePauseSubscriptionBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimatePauseSubscriptionParams build() {
-      return new EstimatePauseSubscriptionParams(this);
-    }
-  }
-
-  public enum PauseOption {
-    IMMEDIATELY("immediately"),
-
-    END_OF_TERM("end_of_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    BILLING_CYCLES("billing_cycles"),
-
-    /** An enum member indicating that PauseOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PauseOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PauseOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PauseOption enumValue : PauseOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum UnbilledChargesHandling {
-    NO_ACTION("no_action"),
-
-    INVOICE("invoice"),
-
-    /**
-     * An enum member indicating that UnbilledChargesHandling was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    UnbilledChargesHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static UnbilledChargesHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (UnbilledChargesHandling enumValue : UnbilledChargesHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder pauseDate(Timestamp value) {
-
-        formData.put("pause_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder resumeDate(Timestamp value) {
-
-        formData.put("resume_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder skipBillingCycles(Integer value) {
-
-        formData.put("skip_billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimatePaymentSchedulesParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimatePaymentSchedulesParams.java
deleted file mode 100644
index d3e3333e..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimatePaymentSchedulesParams.java
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class EstimatePaymentSchedulesParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimatePaymentSchedulesParams(EstimatePaymentSchedulesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimatePaymentSchedulesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimatePaymentSchedulesBuilder builder() {
-    return new EstimatePaymentSchedulesBuilder();
-  }
-
-  public static final class EstimatePaymentSchedulesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimatePaymentSchedulesBuilder() {}
-
-    public EstimatePaymentSchedulesBuilder schemeId(String value) {
-
-      formData.put("scheme_id", value);
-
-      return this;
-    }
-
-    public EstimatePaymentSchedulesBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public EstimatePaymentSchedulesBuilder invoiceId(String value) {
-
-      formData.put("invoice_id", value);
-
-      return this;
-    }
-
-    public EstimatePaymentSchedulesBuilder paymentScheduleStartDate(Timestamp value) {
-
-      formData.put("payment_schedule_start_date", value);
-
-      return this;
-    }
-
-    public EstimatePaymentSchedulesParams build() {
-      return new EstimatePaymentSchedulesParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateRegenerateInvoiceEstimateParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateRegenerateInvoiceEstimateParams.java
deleted file mode 100644
index 6ac5a4c6..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateRegenerateInvoiceEstimateParams.java
+++ /dev/null
@@ -1,73 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class EstimateRegenerateInvoiceEstimateParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateRegenerateInvoiceEstimateParams(
-      EstimateRegenerateInvoiceEstimateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateRegenerateInvoiceEstimateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateRegenerateInvoiceEstimateBuilder builder() {
-    return new EstimateRegenerateInvoiceEstimateBuilder();
-  }
-
-  public static final class EstimateRegenerateInvoiceEstimateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateRegenerateInvoiceEstimateBuilder() {}
-
-    public EstimateRegenerateInvoiceEstimateBuilder dateFrom(Timestamp value) {
-
-      formData.put("date_from", value);
-
-      return this;
-    }
-
-    public EstimateRegenerateInvoiceEstimateBuilder dateTo(Timestamp value) {
-
-      formData.put("date_to", value);
-
-      return this;
-    }
-
-    public EstimateRegenerateInvoiceEstimateBuilder prorate(Boolean value) {
-
-      formData.put("prorate", value);
-
-      return this;
-    }
-
-    public EstimateRegenerateInvoiceEstimateBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public EstimateRegenerateInvoiceEstimateParams build() {
-      return new EstimateRegenerateInvoiceEstimateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateRenewalEstimateParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateRenewalEstimateParams.java
deleted file mode 100644
index d86f79cc..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateRenewalEstimateParams.java
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class EstimateRenewalEstimateParams {
-
-  private final Map<String, Object> queryParams;
-
-  private EstimateRenewalEstimateParams(EstimateRenewalEstimateBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public EstimateRenewalEstimateBuilder toBuilder() {
-    EstimateRenewalEstimateBuilder builder = new EstimateRenewalEstimateBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for EstimateRenewalEstimateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateRenewalEstimateBuilder builder() {
-    return new EstimateRenewalEstimateBuilder();
-  }
-
-  public static final class EstimateRenewalEstimateBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private EstimateRenewalEstimateBuilder() {}
-
-    public EstimateRenewalEstimateBuilder includeDelayedCharges(Boolean value) {
-      queryParams.put("include_delayed_charges", value);
-      return this;
-    }
-
-    public EstimateRenewalEstimateBuilder useExistingBalances(Boolean value) {
-      queryParams.put("use_existing_balances", value);
-      return this;
-    }
-
-    public EstimateRenewalEstimateBuilder ignoreScheduledCancellation(Boolean value) {
-      queryParams.put("ignore_scheduled_cancellation", value);
-      return this;
-    }
-
-    public EstimateRenewalEstimateBuilder ignoreScheduledChanges(Boolean value) {
-      queryParams.put("ignore_scheduled_changes", value);
-      return this;
-    }
-
-    public EstimateRenewalEstimateParams build() {
-      return new EstimateRenewalEstimateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateResumeSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateResumeSubscriptionParams.java
deleted file mode 100644
index 78632f5b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateResumeSubscriptionParams.java
+++ /dev/null
@@ -1,162 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class EstimateResumeSubscriptionParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateResumeSubscriptionParams(EstimateResumeSubscriptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateResumeSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateResumeSubscriptionBuilder builder() {
-    return new EstimateResumeSubscriptionBuilder();
-  }
-
-  public static final class EstimateResumeSubscriptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateResumeSubscriptionBuilder() {}
-
-    public EstimateResumeSubscriptionBuilder resumeOption(ResumeOption value) {
-
-      formData.put("resume_option", value);
-
-      return this;
-    }
-
-    public EstimateResumeSubscriptionBuilder chargesHandling(ChargesHandling value) {
-
-      formData.put("charges_handling", value);
-
-      return this;
-    }
-
-    public EstimateResumeSubscriptionBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateResumeSubscriptionParams build() {
-      return new EstimateResumeSubscriptionParams(this);
-    }
-  }
-
-  public enum ResumeOption {
-    IMMEDIATELY("immediately"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    /** An enum member indicating that ResumeOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ResumeOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ResumeOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ResumeOption enumValue : ResumeOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChargesHandling {
-    INVOICE_IMMEDIATELY("invoice_immediately"),
-
-    ADD_TO_UNBILLED_CHARGES("add_to_unbilled_charges"),
-
-    /** An enum member indicating that ChargesHandling was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChargesHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChargesHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChargesHandling enumValue : ChargesHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder resumeDate(Timestamp value) {
-
-        formData.put("resume_date", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateUpcomingInvoicesEstimateParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateUpcomingInvoicesEstimateParams.java
deleted file mode 100644
index 492f6056..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateUpcomingInvoicesEstimateParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class EstimateUpcomingInvoicesEstimateParams {
-
-  private final Map<String, Object> queryParams;
-
-  private EstimateUpcomingInvoicesEstimateParams(EstimateUpcomingInvoicesEstimateBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public EstimateUpcomingInvoicesEstimateBuilder toBuilder() {
-    EstimateUpcomingInvoicesEstimateBuilder builder = new EstimateUpcomingInvoicesEstimateBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for EstimateUpcomingInvoicesEstimateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateUpcomingInvoicesEstimateBuilder builder() {
-    return new EstimateUpcomingInvoicesEstimateBuilder();
-  }
-
-  public static final class EstimateUpcomingInvoicesEstimateBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private EstimateUpcomingInvoicesEstimateBuilder() {}
-
-    public EstimateUpcomingInvoicesEstimateParams build() {
-      return new EstimateUpcomingInvoicesEstimateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateUpdateSubscriptionForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateUpdateSubscriptionForItemsParams.java
deleted file mode 100644
index 7263af81..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateUpdateSubscriptionForItemsParams.java
+++ /dev/null
@@ -1,1548 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class EstimateUpdateSubscriptionForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateUpdateSubscriptionForItemsParams(
-      EstimateUpdateSubscriptionForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateUpdateSubscriptionForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateUpdateSubscriptionForItemsBuilder builder() {
-    return new EstimateUpdateSubscriptionForItemsBuilder();
-  }
-
-  public static final class EstimateUpdateSubscriptionForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateUpdateSubscriptionForItemsBuilder() {}
-
-    public EstimateUpdateSubscriptionForItemsBuilder changesScheduledAt(Timestamp value) {
-
-      formData.put("changes_scheduled_at", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder changeOption(ChangeOption value) {
-
-      formData.put("change_option", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder mandatoryItemsToRemove(List<String> value) {
-
-      formData.put("mandatory_items_to_remove", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder replaceItemsList(Boolean value) {
-
-      formData.put("replace_items_list", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder reactivateFrom(Timestamp value) {
-
-      formData.put("reactivate_from", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder billingAlignmentMode(
-        BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder replaceCouponList(Boolean value) {
-
-      formData.put("replace_coupon_list", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder prorate(Boolean value) {
-
-      formData.put("prorate", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder endOfTerm(Boolean value) {
-
-      formData.put("end_of_term", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder forceTermReset(Boolean value) {
-
-      formData.put("force_term_reset", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder reactivate(Boolean value) {
-
-      formData.put("reactivate", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder includeDelayedCharges(Boolean value) {
-
-      formData.put("include_delayed_charges", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder useExistingBalances(Boolean value) {
-
-      formData.put("use_existing_balances", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder invoiceUsages(Boolean value) {
-
-      formData.put("invoice_usages", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder billingOverride(BillingOverrideParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_override[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionForItemsParams build() {
-      return new EstimateUpdateSubscriptionForItemsParams(this);
-    }
-  }
-
-  public enum ChangeOption {
-    IMMEDIATELY("immediately"),
-
-    END_OF_TERM("end_of_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChangeOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChangeOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChangeOption enumValue : ChangeOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder coupon(String value) {
-
-        formData.put("coupon", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder autoCollection(AutoCollection value) {
-
-        formData.put("auto_collection", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder freePeriod(Integer value) {
-
-        formData.put("free_period", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder freePeriodUnit(FreePeriodUnit value) {
-
-        formData.put("free_period_unit", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEndAction(TrialEndAction value) {
-
-        formData.put("trial_end_action", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum AutoCollection {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AutoCollection(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AutoCollection fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AutoCollection enumValue : AutoCollection.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum FreePeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      FreePeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static FreePeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum TrialEndAction {
-      SITE_DEFAULT("site_default"),
-
-      PLAN_DEFAULT("plan_default"),
-
-      ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-      CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-      /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      TrialEndAction(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static TrialEndAction fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (TrialEndAction enumValue : TrialEndAction.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder registeredForGst(Boolean value) {
-
-        formData.put("registered_for_gst", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CustomerBuilder taxability(Taxability value) {
-
-        formData.put("taxability", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-
-    public enum Taxability {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Taxability was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Taxability(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Taxability fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Taxability enumValue : Taxability.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingOverrideParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingOverrideParams(BillingOverrideBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingOverrideParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingOverrideBuilder builder() {
-      return new BillingOverrideBuilder();
-    }
-
-    public static final class BillingOverrideBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingOverrideBuilder() {}
-
-      public BillingOverrideBuilder maxExcessPaymentUsage(Long value) {
-
-        formData.put("max_excess_payment_usage", value);
-
-        return this;
-      }
-
-      public BillingOverrideBuilder maxRefundableCreditsUsage(Long value) {
-
-        formData.put("max_refundable_credits_usage", value);
-
-        return this;
-      }
-
-      public BillingOverrideParams build() {
-        return new BillingOverrideParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder prorationType(ProrationType value) {
-
-        formData.put("proration_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ProrationType {
-      FULL_TERM("full_term"),
-
-      PARTIAL_TERM("partial_term"),
-
-      NONE("none"),
-
-      /** An enum member indicating that ProrationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ProrationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ProrationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ProrationType enumValue : ProrationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder operationType(OperationType value) {
-
-        formData.put("operation_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OperationType {
-      ADD("add"),
-
-      REMOVE("remove"),
-
-      /** An enum member indicating that OperationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OperationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OperationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OperationType enumValue : OperationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateUpdateSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateUpdateSubscriptionParams.java
deleted file mode 100644
index 5c1794e6..00000000
--- a/src/main/java/com/chargebee/v4/core/models/estimate/params/EstimateUpdateSubscriptionParams.java
+++ /dev/null
@@ -1,1181 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.estimate.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class EstimateUpdateSubscriptionParams {
-
-  private final Map<String, Object> formData;
-
-  private EstimateUpdateSubscriptionParams(EstimateUpdateSubscriptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for EstimateUpdateSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static EstimateUpdateSubscriptionBuilder builder() {
-    return new EstimateUpdateSubscriptionBuilder();
-  }
-
-  public static final class EstimateUpdateSubscriptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private EstimateUpdateSubscriptionBuilder() {}
-
-    public EstimateUpdateSubscriptionBuilder changesScheduledAt(Timestamp value) {
-
-      formData.put("changes_scheduled_at", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder changeOption(ChangeOption value) {
-
-      formData.put("change_option", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder replaceAddonList(Boolean value) {
-
-      formData.put("replace_addon_list", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder mandatoryAddonsToRemove(List<String> value) {
-
-      formData.put("mandatory_addons_to_remove", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder reactivateFrom(Timestamp value) {
-
-      formData.put("reactivate_from", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder replaceCouponList(Boolean value) {
-
-      formData.put("replace_coupon_list", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder prorate(Boolean value) {
-
-      formData.put("prorate", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder endOfTerm(Boolean value) {
-
-      formData.put("end_of_term", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder forceTermReset(Boolean value) {
-
-      formData.put("force_term_reset", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder reactivate(Boolean value) {
-
-      formData.put("reactivate", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder includeDelayedCharges(Boolean value) {
-
-      formData.put("include_delayed_charges", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder useExistingBalances(Boolean value) {
-
-      formData.put("use_existing_balances", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public EstimateUpdateSubscriptionParams build() {
-      return new EstimateUpdateSubscriptionParams(this);
-    }
-  }
-
-  public enum ChangeOption {
-    IMMEDIATELY("immediately"),
-
-    END_OF_TERM("end_of_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChangeOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChangeOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChangeOption enumValue : ChangeOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planId(String value) {
-
-        formData.put("plan_id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantity(Integer value) {
-
-        formData.put("plan_quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPrice(Long value) {
-
-        formData.put("plan_unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantityInDecimal(String value) {
-
-        formData.put("plan_quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
-
-        formData.put("plan_unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder coupon(String value) {
-
-        formData.put("coupon", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder autoCollection(AutoCollection value) {
-
-        formData.put("auto_collection", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder freePeriod(Integer value) {
-
-        formData.put("free_period", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder freePeriodUnit(FreePeriodUnit value) {
-
-        formData.put("free_period_unit", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEndAction(TrialEndAction value) {
-
-        formData.put("trial_end_action", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum AutoCollection {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AutoCollection(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AutoCollection fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AutoCollection enumValue : AutoCollection.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum FreePeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      FreePeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static FreePeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum TrialEndAction {
-      SITE_DEFAULT("site_default"),
-
-      PLAN_DEFAULT("plan_default"),
-
-      ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-      CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-      /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      TrialEndAction(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static TrialEndAction fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (TrialEndAction enumValue : TrialEndAction.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder registeredForGst(Boolean value) {
-
-        formData.put("registered_for_gst", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CustomerBuilder taxability(Taxability value) {
-
-        formData.put("taxability", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-
-    public enum Taxability {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Taxability was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Taxability(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Taxability fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Taxability enumValue : Taxability.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public AddonsBuilder prorationType(ProrationType value) {
-
-        formData.put("proration_type", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-
-    public enum ProrationType {
-      FULL_TERM("full_term"),
-
-      PARTIAL_TERM("partial_term"),
-
-      NONE("none"),
-
-      /** An enum member indicating that ProrationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ProrationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ProrationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ProrationType enumValue : ProrationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
-
-        formData.put("charge_on", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum ChargeOn {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOn enumValue : ChargeOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportAddonsParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportAddonsParams.java
deleted file mode 100644
index 5d72fd3b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportAddonsParams.java
+++ /dev/null
@@ -1,1081 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportAddonsParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportAddonsParams(ExportAddonsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportAddonsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportAddonsBuilder builder() {
-    return new ExportAddonsBuilder();
-  }
-
-  public static final class ExportAddonsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportAddonsBuilder() {}
-
-    public ExportAddonsBuilder currencyCode(CurrencyCodeParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "currency_code[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportAddonsBuilder addon(AddonParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "addon[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportAddonsParams build() {
-      return new ExportAddonsParams(this);
-    }
-  }
-
-  public static final class CurrencyCodeParams {
-
-    private final Map<String, Object> formData;
-
-    private CurrencyCodeParams(CurrencyCodeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CurrencyCodeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CurrencyCodeBuilder builder() {
-      return new CurrencyCodeBuilder();
-    }
-
-    public static final class CurrencyCodeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CurrencyCodeBuilder() {}
-
-      public CurrencyCodeBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CurrencyCodeParams build() {
-        return new CurrencyCodeParams(this);
-      }
-    }
-  }
-
-  public static final class AddonParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonParams(AddonBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonBuilder builder() {
-      return new AddonBuilder();
-    }
-
-    public static final class AddonBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonBuilder() {}
-
-      public AddonBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AddonBuilder name(NameParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "name[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AddonBuilder chargeType(ChargeTypeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "charge_type[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AddonBuilder price(PriceParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "price[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AddonBuilder period(PeriodParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "period[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AddonBuilder periodUnit(PeriodUnitParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "period_unit[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AddonBuilder status(StatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AddonBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AddonBuilder channel(ChannelParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AddonParams build() {
-        return new AddonParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class NameParams {
-
-    private final Map<String, Object> formData;
-
-    private NameParams(NameBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NameParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NameBuilder builder() {
-      return new NameBuilder();
-    }
-
-    public static final class NameBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NameBuilder() {}
-
-      public NameBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public NameBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public NameBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public NameBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public NameBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public NameParams build() {
-        return new NameParams(this);
-      }
-    }
-  }
-
-  public static final class ChargeTypeParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargeTypeParams(ChargeTypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargeTypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargeTypeBuilder builder() {
-      return new ChargeTypeBuilder();
-    }
-
-    public static final class ChargeTypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargeTypeBuilder() {}
-
-      public ChargeTypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ChargeTypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ChargeTypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ChargeTypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ChargeTypeParams build() {
-        return new ChargeTypeParams(this);
-      }
-    }
-
-    public enum Is {
-      RECURRING("recurring"),
-
-      NON_RECURRING("non_recurring"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      RECURRING("recurring"),
-
-      NON_RECURRING("non_recurring"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PriceParams {
-
-    private final Map<String, Object> formData;
-
-    private PriceParams(PriceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PriceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PriceBuilder builder() {
-      return new PriceBuilder();
-    }
-
-    public static final class PriceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PriceBuilder() {}
-
-      public PriceBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PriceBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PriceBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public PriceBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public PriceBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public PriceBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public PriceBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public PriceParams build() {
-        return new PriceParams(this);
-      }
-    }
-  }
-
-  public static final class PeriodParams {
-
-    private final Map<String, Object> formData;
-
-    private PeriodParams(PeriodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PeriodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PeriodBuilder builder() {
-      return new PeriodBuilder();
-    }
-
-    public static final class PeriodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PeriodBuilder() {}
-
-      public PeriodBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PeriodBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PeriodBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public PeriodBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public PeriodBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public PeriodBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public PeriodBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public PeriodParams build() {
-        return new PeriodParams(this);
-      }
-    }
-  }
-
-  public static final class PeriodUnitParams {
-
-    private final Map<String, Object> formData;
-
-    private PeriodUnitParams(PeriodUnitBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PeriodUnitParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PeriodUnitBuilder builder() {
-      return new PeriodUnitBuilder();
-    }
-
-    public static final class PeriodUnitBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PeriodUnitBuilder() {}
-
-      public PeriodUnitBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PeriodUnitBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PeriodUnitBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PeriodUnitBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PeriodUnitParams build() {
-        return new PeriodUnitParams(this);
-      }
-    }
-
-    public enum Is {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      NOT_APPLICABLE("not_applicable"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      NOT_APPLICABLE("not_applicable"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatusParams {
-
-    private final Map<String, Object> formData;
-
-    private StatusParams(StatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatusBuilder builder() {
-      return new StatusBuilder();
-    }
-
-    public static final class StatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatusBuilder() {}
-
-      public StatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public StatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public StatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public StatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public StatusParams build() {
-        return new StatusParams(this);
-      }
-    }
-
-    public enum Is {
-      ACTIVE("active"),
-
-      ARCHIVED("archived"),
-
-      DELETED("deleted"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ACTIVE("active"),
-
-      ARCHIVED("archived"),
-
-      DELETED("deleted"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class ChannelParams {
-
-    private final Map<String, Object> formData;
-
-    private ChannelParams(ChannelBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChannelParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChannelBuilder builder() {
-      return new ChannelBuilder();
-    }
-
-    public static final class ChannelBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChannelBuilder() {}
-
-      public ChannelBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ChannelBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ChannelBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ChannelBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ChannelParams build() {
-        return new ChannelParams(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportAttachedItemsParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportAttachedItemsParams.java
deleted file mode 100644
index da8655a7..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportAttachedItemsParams.java
+++ /dev/null
@@ -1,780 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportAttachedItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportAttachedItemsParams(ExportAttachedItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportAttachedItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportAttachedItemsBuilder builder() {
-    return new ExportAttachedItemsBuilder();
-  }
-
-  public static final class ExportAttachedItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportAttachedItemsBuilder() {}
-
-    public ExportAttachedItemsBuilder itemType(ItemTypeParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_type[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportAttachedItemsBuilder attachedItem(AttachedItemParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "attached_item[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportAttachedItemsParams build() {
-      return new ExportAttachedItemsParams(this);
-    }
-  }
-
-  public static final class ItemTypeParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTypeParams(ItemTypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTypeBuilder builder() {
-      return new ItemTypeBuilder();
-    }
-
-    public static final class ItemTypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTypeBuilder() {}
-
-      public ItemTypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemTypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemTypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemTypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemTypeParams build() {
-        return new ItemTypeParams(this);
-      }
-    }
-
-    public enum Is {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AttachedItemParams {
-
-    private final Map<String, Object> formData;
-
-    private AttachedItemParams(AttachedItemBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AttachedItemParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AttachedItemBuilder builder() {
-      return new AttachedItemBuilder();
-    }
-
-    public static final class AttachedItemBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AttachedItemBuilder() {}
-
-      public AttachedItemBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AttachedItemBuilder itemId(ItemIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "item_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AttachedItemBuilder type(TypeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "type[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AttachedItemBuilder chargeOnEvent(ChargeOnEventParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "charge_on_event[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AttachedItemBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AttachedItemBuilder parentItemId(ParentItemIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "parent_item_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public AttachedItemParams build() {
-        return new AttachedItemParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class ItemIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemIdParams(ItemIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemIdBuilder builder() {
-      return new ItemIdBuilder();
-    }
-
-    public static final class ItemIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemIdBuilder() {}
-
-      public ItemIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemIdParams build() {
-        return new ItemIdParams(this);
-      }
-    }
-  }
-
-  public static final class TypeParams {
-
-    private final Map<String, Object> formData;
-
-    private TypeParams(TypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TypeBuilder builder() {
-      return new TypeBuilder();
-    }
-
-    public static final class TypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TypeBuilder() {}
-
-      public TypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public TypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public TypeParams build() {
-        return new TypeParams(this);
-      }
-    }
-
-    public enum Is {
-      RECOMMENDED("recommended"),
-
-      MANDATORY("mandatory"),
-
-      OPTIONAL("optional"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      RECOMMENDED("recommended"),
-
-      MANDATORY("mandatory"),
-
-      OPTIONAL("optional"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChargeOnEventParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargeOnEventParams(ChargeOnEventBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargeOnEventParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargeOnEventBuilder builder() {
-      return new ChargeOnEventBuilder();
-    }
-
-    public static final class ChargeOnEventBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargeOnEventBuilder() {}
-
-      public ChargeOnEventBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ChargeOnEventBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ChargeOnEventBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ChargeOnEventBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ChargeOnEventParams build() {
-        return new ChargeOnEventParams(this);
-      }
-    }
-
-    public enum Is {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      ON_DEMAND("on_demand"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      ON_DEMAND("on_demand"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class ParentItemIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ParentItemIdParams(ParentItemIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ParentItemIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ParentItemIdBuilder builder() {
-      return new ParentItemIdBuilder();
-    }
-
-    public static final class ParentItemIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ParentItemIdBuilder() {}
-
-      public ParentItemIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ParentItemIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ParentItemIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ParentItemIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ParentItemIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ParentItemIdParams build() {
-        return new ParentItemIdParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportCouponsParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportCouponsParams.java
deleted file mode 100644
index 4eae80e7..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportCouponsParams.java
+++ /dev/null
@@ -1,978 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportCouponsParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportCouponsParams(ExportCouponsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportCouponsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportCouponsBuilder builder() {
-    return new ExportCouponsBuilder();
-  }
-
-  public static final class ExportCouponsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportCouponsBuilder() {}
-
-    public ExportCouponsBuilder currencyCode(CurrencyCodeParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "currency_code[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportCouponsBuilder coupon(CouponParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "coupon[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportCouponsParams build() {
-      return new ExportCouponsParams(this);
-    }
-  }
-
-  public static final class CurrencyCodeParams {
-
-    private final Map<String, Object> formData;
-
-    private CurrencyCodeParams(CurrencyCodeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CurrencyCodeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CurrencyCodeBuilder builder() {
-      return new CurrencyCodeBuilder();
-    }
-
-    public static final class CurrencyCodeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CurrencyCodeBuilder() {}
-
-      public CurrencyCodeBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CurrencyCodeParams build() {
-        return new CurrencyCodeParams(this);
-      }
-    }
-  }
-
-  public static final class CouponParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponParams(CouponBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponBuilder builder() {
-      return new CouponBuilder();
-    }
-
-    public static final class CouponBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponBuilder() {}
-
-      public CouponBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CouponBuilder name(NameParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "name[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CouponBuilder discountType(DiscountTypeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "discount_type[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CouponBuilder durationType(DurationTypeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "duration_type[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CouponBuilder status(StatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CouponBuilder applyOn(ApplyOnParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "apply_on[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CouponBuilder createdAt(CreatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "created_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CouponBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CouponParams build() {
-        return new CouponParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class NameParams {
-
-    private final Map<String, Object> formData;
-
-    private NameParams(NameBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NameParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NameBuilder builder() {
-      return new NameBuilder();
-    }
-
-    public static final class NameBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NameBuilder() {}
-
-      public NameBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public NameBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public NameBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public NameBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public NameBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public NameParams build() {
-        return new NameParams(this);
-      }
-    }
-  }
-
-  public static final class DiscountTypeParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountTypeParams(DiscountTypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountTypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountTypeBuilder builder() {
-      return new DiscountTypeBuilder();
-    }
-
-    public static final class DiscountTypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountTypeBuilder() {}
-
-      public DiscountTypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public DiscountTypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public DiscountTypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public DiscountTypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public DiscountTypeParams build() {
-        return new DiscountTypeParams(this);
-      }
-    }
-
-    public enum Is {
-      FIXED_AMOUNT("fixed_amount"),
-
-      PERCENTAGE("percentage"),
-
-      OFFER_QUANTITY("offer_quantity"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      FIXED_AMOUNT("fixed_amount"),
-
-      PERCENTAGE("percentage"),
-
-      OFFER_QUANTITY("offer_quantity"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DurationTypeParams {
-
-    private final Map<String, Object> formData;
-
-    private DurationTypeParams(DurationTypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DurationTypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DurationTypeBuilder builder() {
-      return new DurationTypeBuilder();
-    }
-
-    public static final class DurationTypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DurationTypeBuilder() {}
-
-      public DurationTypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public DurationTypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public DurationTypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public DurationTypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public DurationTypeParams build() {
-        return new DurationTypeParams(this);
-      }
-    }
-
-    public enum Is {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatusParams {
-
-    private final Map<String, Object> formData;
-
-    private StatusParams(StatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatusBuilder builder() {
-      return new StatusBuilder();
-    }
-
-    public static final class StatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatusBuilder() {}
-
-      public StatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public StatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public StatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public StatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public StatusParams build() {
-        return new StatusParams(this);
-      }
-    }
-
-    public enum Is {
-      ACTIVE("active"),
-
-      EXPIRED("expired"),
-
-      ARCHIVED("archived"),
-
-      DELETED("deleted"),
-
-      FUTURE("future"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ACTIVE("active"),
-
-      EXPIRED("expired"),
-
-      ARCHIVED("archived"),
-
-      DELETED("deleted"),
-
-      FUTURE("future"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ApplyOnParams {
-
-    private final Map<String, Object> formData;
-
-    private ApplyOnParams(ApplyOnBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ApplyOnParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ApplyOnBuilder builder() {
-      return new ApplyOnBuilder();
-    }
-
-    public static final class ApplyOnBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ApplyOnBuilder() {}
-
-      public ApplyOnBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ApplyOnBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ApplyOnBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ApplyOnBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ApplyOnParams build() {
-        return new ApplyOnParams(this);
-      }
-    }
-
-    public enum Is {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIED_ITEMS_TOTAL("specified_items_total"),
-
-      EACH_SPECIFIED_ITEM("each_specified_item"),
-
-      EACH_UNIT_OF_SPECIFIED_ITEMS("each_unit_of_specified_items"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIED_ITEMS_TOTAL("specified_items_total"),
-
-      EACH_SPECIFIED_ITEM("each_specified_item"),
-
-      EACH_UNIT_OF_SPECIFIED_ITEMS("each_unit_of_specified_items"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CreatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private CreatedAtParams(CreatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreatedAtBuilder builder() {
-      return new CreatedAtBuilder();
-    }
-
-    public static final class CreatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreatedAtBuilder() {}
-
-      public CreatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public CreatedAtParams build() {
-        return new CreatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportCreditNotesParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportCreditNotesParams.java
deleted file mode 100644
index 5c8630b6..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportCreditNotesParams.java
+++ /dev/null
@@ -1,1782 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportCreditNotesParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportCreditNotesParams(ExportCreditNotesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportCreditNotesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportCreditNotesBuilder builder() {
-    return new ExportCreditNotesBuilder();
-  }
-
-  public static final class ExportCreditNotesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportCreditNotesBuilder() {}
-
-    public ExportCreditNotesBuilder creditNote(CreditNoteParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "credit_note[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportCreditNotesParams build() {
-      return new ExportCreditNotesParams(this);
-    }
-  }
-
-  public static final class CreditNoteParams {
-
-    private final Map<String, Object> formData;
-
-    private CreditNoteParams(CreditNoteBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreditNoteParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreditNoteBuilder builder() {
-      return new CreditNoteBuilder();
-    }
-
-    public static final class CreditNoteBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreditNoteBuilder() {}
-
-      public CreditNoteBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder customerId(CustomerIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "customer_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder subscriptionId(SubscriptionIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "subscription_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder referenceInvoiceId(ReferenceInvoiceIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "reference_invoice_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder type(TypeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "type[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder reasonCode(ReasonCodeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "reason_code[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder createReasonCode(CreateReasonCodeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "create_reason_code[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder status(StatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder date(DateParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "date[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder total(TotalParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "total[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder priceType(PriceTypeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "price_type[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder amountAllocated(AmountAllocatedParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_allocated[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder amountRefunded(AmountRefundedParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_refunded[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder amountAvailable(AmountAvailableParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_available[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder voidedAt(VoidedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "voided_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteBuilder channel(ChannelParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CreditNoteParams build() {
-        return new CreditNoteParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerIdParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerIdParams(CustomerIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerIdBuilder builder() {
-      return new CustomerIdBuilder();
-    }
-
-    public static final class CustomerIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerIdBuilder() {}
-
-      public CustomerIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CustomerIdParams build() {
-        return new CustomerIdParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionIdParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionIdParams(SubscriptionIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionIdBuilder builder() {
-      return new SubscriptionIdBuilder();
-    }
-
-    public static final class SubscriptionIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionIdBuilder() {}
-
-      public SubscriptionIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public SubscriptionIdParams build() {
-        return new SubscriptionIdParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ReferenceInvoiceIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ReferenceInvoiceIdParams(ReferenceInvoiceIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ReferenceInvoiceIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ReferenceInvoiceIdBuilder builder() {
-      return new ReferenceInvoiceIdBuilder();
-    }
-
-    public static final class ReferenceInvoiceIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ReferenceInvoiceIdBuilder() {}
-
-      public ReferenceInvoiceIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ReferenceInvoiceIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ReferenceInvoiceIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ReferenceInvoiceIdBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public ReferenceInvoiceIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ReferenceInvoiceIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ReferenceInvoiceIdParams build() {
-        return new ReferenceInvoiceIdParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TypeParams {
-
-    private final Map<String, Object> formData;
-
-    private TypeParams(TypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TypeBuilder builder() {
-      return new TypeBuilder();
-    }
-
-    public static final class TypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TypeBuilder() {}
-
-      public TypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public TypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public TypeParams build() {
-        return new TypeParams(this);
-      }
-    }
-
-    public enum Is {
-      ADJUSTMENT("adjustment"),
-
-      REFUNDABLE("refundable"),
-
-      STORE("store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ADJUSTMENT("adjustment"),
-
-      REFUNDABLE("refundable"),
-
-      STORE("store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ReasonCodeParams {
-
-    private final Map<String, Object> formData;
-
-    private ReasonCodeParams(ReasonCodeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ReasonCodeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ReasonCodeBuilder builder() {
-      return new ReasonCodeBuilder();
-    }
-
-    public static final class ReasonCodeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ReasonCodeBuilder() {}
-
-      public ReasonCodeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ReasonCodeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ReasonCodeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ReasonCodeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ReasonCodeParams build() {
-        return new ReasonCodeParams(this);
-      }
-    }
-
-    public enum Is {
-      WRITE_OFF("write_off"),
-
-      SUBSCRIPTION_CHANGE("subscription_change"),
-
-      SUBSCRIPTION_CANCELLATION("subscription_cancellation"),
-
-      SUBSCRIPTION_PAUSE("subscription_pause"),
-
-      CHARGEBACK("chargeback"),
-
-      PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
-
-      SERVICE_UNSATISFACTORY("service_unsatisfactory"),
-
-      ORDER_CHANGE("order_change"),
-
-      ORDER_CANCELLATION("order_cancellation"),
-
-      WAIVER("waiver"),
-
-      OTHER("other"),
-
-      FRAUDULENT("fraudulent"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WRITE_OFF("write_off"),
-
-      SUBSCRIPTION_CHANGE("subscription_change"),
-
-      SUBSCRIPTION_CANCELLATION("subscription_cancellation"),
-
-      SUBSCRIPTION_PAUSE("subscription_pause"),
-
-      CHARGEBACK("chargeback"),
-
-      PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
-
-      SERVICE_UNSATISFACTORY("service_unsatisfactory"),
-
-      ORDER_CHANGE("order_change"),
-
-      ORDER_CANCELLATION("order_cancellation"),
-
-      WAIVER("waiver"),
-
-      OTHER("other"),
-
-      FRAUDULENT("fraudulent"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CreateReasonCodeParams {
-
-    private final Map<String, Object> formData;
-
-    private CreateReasonCodeParams(CreateReasonCodeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreateReasonCodeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreateReasonCodeBuilder builder() {
-      return new CreateReasonCodeBuilder();
-    }
-
-    public static final class CreateReasonCodeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreateReasonCodeBuilder() {}
-
-      public CreateReasonCodeBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CreateReasonCodeBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CreateReasonCodeBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CreateReasonCodeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CreateReasonCodeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CreateReasonCodeParams build() {
-        return new CreateReasonCodeParams(this);
-      }
-    }
-  }
-
-  public static final class StatusParams {
-
-    private final Map<String, Object> formData;
-
-    private StatusParams(StatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatusBuilder builder() {
-      return new StatusBuilder();
-    }
-
-    public static final class StatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatusBuilder() {}
-
-      public StatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public StatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public StatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public StatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public StatusParams build() {
-        return new StatusParams(this);
-      }
-    }
-
-    public enum Is {
-      ADJUSTED("adjusted"),
-
-      REFUNDED("refunded"),
-
-      REFUND_DUE("refund_due"),
-
-      VOIDED("voided"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ADJUSTED("adjusted"),
-
-      REFUNDED("refunded"),
-
-      REFUND_DUE("refund_due"),
-
-      VOIDED("voided"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DateParams {
-
-    private final Map<String, Object> formData;
-
-    private DateParams(DateBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DateParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DateBuilder builder() {
-      return new DateBuilder();
-    }
-
-    public static final class DateBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DateBuilder() {}
-
-      public DateBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public DateBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public DateBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public DateBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public DateParams build() {
-        return new DateParams(this);
-      }
-    }
-  }
-
-  public static final class TotalParams {
-
-    private final Map<String, Object> formData;
-
-    private TotalParams(TotalBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TotalParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TotalBuilder builder() {
-      return new TotalBuilder();
-    }
-
-    public static final class TotalBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TotalBuilder() {}
-
-      public TotalBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TotalBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TotalBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public TotalBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public TotalBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public TotalBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public TotalBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public TotalParams build() {
-        return new TotalParams(this);
-      }
-    }
-  }
-
-  public static final class PriceTypeParams {
-
-    private final Map<String, Object> formData;
-
-    private PriceTypeParams(PriceTypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PriceTypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PriceTypeBuilder builder() {
-      return new PriceTypeBuilder();
-    }
-
-    public static final class PriceTypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PriceTypeBuilder() {}
-
-      public PriceTypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PriceTypeParams build() {
-        return new PriceTypeParams(this);
-      }
-    }
-
-    public enum Is {
-      TAX_EXCLUSIVE("tax_exclusive"),
-
-      TAX_INCLUSIVE("tax_inclusive"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      TAX_EXCLUSIVE("tax_exclusive"),
-
-      TAX_INCLUSIVE("tax_inclusive"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AmountAllocatedParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountAllocatedParams(AmountAllocatedBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountAllocatedParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountAllocatedBuilder builder() {
-      return new AmountAllocatedBuilder();
-    }
-
-    public static final class AmountAllocatedBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountAllocatedBuilder() {}
-
-      public AmountAllocatedBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountAllocatedBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountAllocatedBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountAllocatedBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountAllocatedBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountAllocatedBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountAllocatedBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountAllocatedParams build() {
-        return new AmountAllocatedParams(this);
-      }
-    }
-  }
-
-  public static final class AmountRefundedParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountRefundedParams(AmountRefundedBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountRefundedParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountRefundedBuilder builder() {
-      return new AmountRefundedBuilder();
-    }
-
-    public static final class AmountRefundedBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountRefundedBuilder() {}
-
-      public AmountRefundedBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountRefundedBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountRefundedBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountRefundedBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountRefundedBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountRefundedBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountRefundedBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountRefundedParams build() {
-        return new AmountRefundedParams(this);
-      }
-    }
-  }
-
-  public static final class AmountAvailableParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountAvailableParams(AmountAvailableBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountAvailableParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountAvailableBuilder builder() {
-      return new AmountAvailableBuilder();
-    }
-
-    public static final class AmountAvailableBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountAvailableBuilder() {}
-
-      public AmountAvailableBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountAvailableBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountAvailableBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountAvailableBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountAvailableBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountAvailableBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountAvailableBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountAvailableParams build() {
-        return new AmountAvailableParams(this);
-      }
-    }
-  }
-
-  public static final class VoidedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private VoidedAtParams(VoidedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for VoidedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static VoidedAtBuilder builder() {
-      return new VoidedAtBuilder();
-    }
-
-    public static final class VoidedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private VoidedAtBuilder() {}
-
-      public VoidedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public VoidedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public VoidedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public VoidedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public VoidedAtParams build() {
-        return new VoidedAtParams(this);
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class ChannelParams {
-
-    private final Map<String, Object> formData;
-
-    private ChannelParams(ChannelBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChannelParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChannelBuilder builder() {
-      return new ChannelBuilder();
-    }
-
-    public static final class ChannelBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChannelBuilder() {}
-
-      public ChannelBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ChannelBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ChannelBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ChannelBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ChannelParams build() {
-        return new ChannelParams(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportCustomersParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportCustomersParams.java
deleted file mode 100644
index ee35eb10..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportCustomersParams.java
+++ /dev/null
@@ -1,1731 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportCustomersParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportCustomersParams(ExportCustomersBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportCustomersParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportCustomersBuilder builder() {
-    return new ExportCustomersBuilder();
-  }
-
-  public static final class ExportCustomersBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportCustomersBuilder() {}
-
-    public ExportCustomersBuilder exportType(ExportType value) {
-
-      formData.put("export_type", value);
-
-      return this;
-    }
-
-    public ExportCustomersBuilder businessEntityId(BusinessEntityIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "business_entity_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportCustomersBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportCustomersBuilder relationship(RelationshipParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "relationship[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportCustomersParams build() {
-      return new ExportCustomersParams(this);
-    }
-  }
-
-  public enum ExportType {
-    DATA("data"),
-
-    IMPORT_FRIENDLY_DATA("import_friendly_data"),
-
-    /** An enum member indicating that ExportType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ExportType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ExportType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ExportType enumValue : ExportType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class BusinessEntityIdParams {
-
-    private final Map<String, Object> formData;
-
-    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BusinessEntityIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BusinessEntityIdBuilder builder() {
-      return new BusinessEntityIdBuilder();
-    }
-
-    public static final class BusinessEntityIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BusinessEntityIdBuilder() {}
-
-      public BusinessEntityIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdParams build() {
-        return new BusinessEntityIdParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder firstName(FirstNameParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "first_name[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder lastName(LastNameParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "last_name[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder email(EmailParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "email[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder company(CompanyParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "company[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder phone(PhoneParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "phone[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder autoCollection(AutoCollectionParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "auto_collection[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder taxability(TaxabilityParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "taxability[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder createdAt(CreatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "created_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder offlinePaymentMethod(OfflinePaymentMethodParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "offline_payment_method[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder autoCloseInvoices(AutoCloseInvoicesParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "auto_close_invoices[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder channel(ChannelParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class FirstNameParams {
-
-    private final Map<String, Object> formData;
-
-    private FirstNameParams(FirstNameBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for FirstNameParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static FirstNameBuilder builder() {
-      return new FirstNameBuilder();
-    }
-
-    public static final class FirstNameBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private FirstNameBuilder() {}
-
-      public FirstNameBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public FirstNameBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public FirstNameBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public FirstNameBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public FirstNameParams build() {
-        return new FirstNameParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class LastNameParams {
-
-    private final Map<String, Object> formData;
-
-    private LastNameParams(LastNameBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LastNameParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LastNameBuilder builder() {
-      return new LastNameBuilder();
-    }
-
-    public static final class LastNameBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LastNameBuilder() {}
-
-      public LastNameBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public LastNameBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public LastNameBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public LastNameBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public LastNameParams build() {
-        return new LastNameParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class EmailParams {
-
-    private final Map<String, Object> formData;
-
-    private EmailParams(EmailBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EmailParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EmailBuilder builder() {
-      return new EmailBuilder();
-    }
-
-    public static final class EmailBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EmailBuilder() {}
-
-      public EmailBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public EmailBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public EmailBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public EmailBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public EmailParams build() {
-        return new EmailParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CompanyParams {
-
-    private final Map<String, Object> formData;
-
-    private CompanyParams(CompanyBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CompanyParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CompanyBuilder builder() {
-      return new CompanyBuilder();
-    }
-
-    public static final class CompanyBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CompanyBuilder() {}
-
-      public CompanyBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CompanyBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CompanyBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CompanyBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public CompanyParams build() {
-        return new CompanyParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PhoneParams {
-
-    private final Map<String, Object> formData;
-
-    private PhoneParams(PhoneBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PhoneParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PhoneBuilder builder() {
-      return new PhoneBuilder();
-    }
-
-    public static final class PhoneBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PhoneBuilder() {}
-
-      public PhoneBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PhoneBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PhoneBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PhoneBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public PhoneParams build() {
-        return new PhoneParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AutoCollectionParams {
-
-    private final Map<String, Object> formData;
-
-    private AutoCollectionParams(AutoCollectionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AutoCollectionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AutoCollectionBuilder builder() {
-      return new AutoCollectionBuilder();
-    }
-
-    public static final class AutoCollectionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AutoCollectionBuilder() {}
-
-      public AutoCollectionBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AutoCollectionBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AutoCollectionBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public AutoCollectionBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public AutoCollectionParams build() {
-        return new AutoCollectionParams(this);
-      }
-    }
-
-    public enum Is {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxabilityParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxabilityParams(TaxabilityBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxabilityParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxabilityBuilder builder() {
-      return new TaxabilityBuilder();
-    }
-
-    public static final class TaxabilityBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxabilityBuilder() {}
-
-      public TaxabilityBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TaxabilityBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TaxabilityBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public TaxabilityBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public TaxabilityParams build() {
-        return new TaxabilityParams(this);
-      }
-    }
-
-    public enum Is {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CreatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private CreatedAtParams(CreatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreatedAtBuilder builder() {
-      return new CreatedAtBuilder();
-    }
-
-    public static final class CreatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreatedAtBuilder() {}
-
-      public CreatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public CreatedAtParams build() {
-        return new CreatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class OfflinePaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private OfflinePaymentMethodParams(OfflinePaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for OfflinePaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static OfflinePaymentMethodBuilder builder() {
-      return new OfflinePaymentMethodBuilder();
-    }
-
-    public static final class OfflinePaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private OfflinePaymentMethodBuilder() {}
-
-      public OfflinePaymentMethodBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodParams build() {
-        return new OfflinePaymentMethodParams(this);
-      }
-    }
-
-    public enum Is {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AutoCloseInvoicesParams {
-
-    private final Map<String, Object> formData;
-
-    private AutoCloseInvoicesParams(AutoCloseInvoicesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AutoCloseInvoicesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AutoCloseInvoicesBuilder builder() {
-      return new AutoCloseInvoicesBuilder();
-    }
-
-    public static final class AutoCloseInvoicesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AutoCloseInvoicesBuilder() {}
-
-      public AutoCloseInvoicesBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AutoCloseInvoicesParams build() {
-        return new AutoCloseInvoicesParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChannelParams {
-
-    private final Map<String, Object> formData;
-
-    private ChannelParams(ChannelBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChannelParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChannelBuilder builder() {
-      return new ChannelBuilder();
-    }
-
-    public static final class ChannelBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChannelBuilder() {}
-
-      public ChannelBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ChannelBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ChannelBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ChannelBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ChannelParams build() {
-        return new ChannelParams(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class RelationshipParams {
-
-    private final Map<String, Object> formData;
-
-    private RelationshipParams(RelationshipBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for RelationshipParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static RelationshipBuilder builder() {
-      return new RelationshipBuilder();
-    }
-
-    public static final class RelationshipBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private RelationshipBuilder() {}
-
-      public RelationshipBuilder parentId(ParentIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "parent_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public RelationshipBuilder paymentOwnerId(PaymentOwnerIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "payment_owner_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public RelationshipBuilder invoiceOwnerId(InvoiceOwnerIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "invoice_owner_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public RelationshipParams build() {
-        return new RelationshipParams(this);
-      }
-    }
-  }
-
-  public static final class ParentIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ParentIdParams(ParentIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ParentIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ParentIdBuilder builder() {
-      return new ParentIdBuilder();
-    }
-
-    public static final class ParentIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ParentIdBuilder() {}
-
-      public ParentIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ParentIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ParentIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ParentIdParams build() {
-        return new ParentIdParams(this);
-      }
-    }
-  }
-
-  public static final class PaymentOwnerIdParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentOwnerIdParams(PaymentOwnerIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentOwnerIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentOwnerIdBuilder builder() {
-      return new PaymentOwnerIdBuilder();
-    }
-
-    public static final class PaymentOwnerIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentOwnerIdBuilder() {}
-
-      public PaymentOwnerIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PaymentOwnerIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PaymentOwnerIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PaymentOwnerIdParams build() {
-        return new PaymentOwnerIdParams(this);
-      }
-    }
-  }
-
-  public static final class InvoiceOwnerIdParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceOwnerIdParams(InvoiceOwnerIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceOwnerIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceOwnerIdBuilder builder() {
-      return new InvoiceOwnerIdBuilder();
-    }
-
-    public static final class InvoiceOwnerIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceOwnerIdBuilder() {}
-
-      public InvoiceOwnerIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public InvoiceOwnerIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public InvoiceOwnerIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public InvoiceOwnerIdParams build() {
-        return new InvoiceOwnerIdParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportDeferredRevenueParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportDeferredRevenueParams.java
deleted file mode 100644
index 74529b77..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportDeferredRevenueParams.java
+++ /dev/null
@@ -1,5043 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportDeferredRevenueParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportDeferredRevenueParams(ExportDeferredRevenueBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportDeferredRevenueParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportDeferredRevenueBuilder builder() {
-    return new ExportDeferredRevenueBuilder();
-  }
-
-  public static final class ExportDeferredRevenueBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportDeferredRevenueBuilder() {}
-
-    public ExportDeferredRevenueBuilder reportBy(ReportBy value) {
-
-      formData.put("report_by", value);
-
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder reportFromMonth(Integer value) {
-
-      formData.put("report_from_month", value);
-
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder reportFromYear(Integer value) {
-
-      formData.put("report_from_year", value);
-
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder reportToMonth(Integer value) {
-
-      formData.put("report_to_month", value);
-
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder reportToYear(Integer value) {
-
-      formData.put("report_to_year", value);
-
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder includeDiscounts(Boolean value) {
-
-      formData.put("include_discounts", value);
-
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder paymentOwner(PaymentOwnerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_owner[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder itemId(ItemIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder itemPriceId(ItemPriceIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_price_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder cancelReasonCode(CancelReasonCodeParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "cancel_reason_code[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder businessEntityId(BusinessEntityIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "business_entity_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder invoice(InvoiceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "invoice[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportDeferredRevenueBuilder relationship(RelationshipParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "relationship[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportDeferredRevenueParams build() {
-      return new ExportDeferredRevenueParams(this);
-    }
-  }
-
-  public enum ReportBy {
-    CUSTOMER("customer"),
-
-    INVOICE("invoice"),
-
-    PRODUCT("product"),
-
-    SUBSCRIPTION("subscription"),
-
-    /** An enum member indicating that ReportBy was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ReportBy(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ReportBy fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ReportBy enumValue : ReportBy.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class PaymentOwnerParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentOwnerParams(PaymentOwnerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentOwnerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentOwnerBuilder builder() {
-      return new PaymentOwnerBuilder();
-    }
-
-    public static final class PaymentOwnerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentOwnerBuilder() {}
-
-      public PaymentOwnerBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PaymentOwnerBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PaymentOwnerBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PaymentOwnerBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PaymentOwnerBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PaymentOwnerParams build() {
-        return new PaymentOwnerParams(this);
-      }
-    }
-  }
-
-  public static final class ItemIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemIdParams(ItemIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemIdBuilder builder() {
-      return new ItemIdBuilder();
-    }
-
-    public static final class ItemIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemIdBuilder() {}
-
-      public ItemIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemIdParams build() {
-        return new ItemIdParams(this);
-      }
-    }
-  }
-
-  public static final class ItemPriceIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemPriceIdParams(ItemPriceIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemPriceIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemPriceIdBuilder builder() {
-      return new ItemPriceIdBuilder();
-    }
-
-    public static final class ItemPriceIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemPriceIdBuilder() {}
-
-      public ItemPriceIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemPriceIdParams build() {
-        return new ItemPriceIdParams(this);
-      }
-    }
-  }
-
-  public static final class CancelReasonCodeParams {
-
-    private final Map<String, Object> formData;
-
-    private CancelReasonCodeParams(CancelReasonCodeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CancelReasonCodeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CancelReasonCodeBuilder builder() {
-      return new CancelReasonCodeBuilder();
-    }
-
-    public static final class CancelReasonCodeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CancelReasonCodeBuilder() {}
-
-      public CancelReasonCodeBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeParams build() {
-        return new CancelReasonCodeParams(this);
-      }
-    }
-  }
-
-  public static final class BusinessEntityIdParams {
-
-    private final Map<String, Object> formData;
-
-    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BusinessEntityIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BusinessEntityIdBuilder builder() {
-      return new BusinessEntityIdBuilder();
-    }
-
-    public static final class BusinessEntityIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BusinessEntityIdBuilder() {}
-
-      public BusinessEntityIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdParams build() {
-        return new BusinessEntityIdParams(this);
-      }
-    }
-  }
-
-  public static final class InvoiceParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceParams(InvoiceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceBuilder builder() {
-      return new InvoiceBuilder();
-    }
-
-    public static final class InvoiceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceBuilder() {}
-
-      public InvoiceBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder recurring(RecurringParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "recurring[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder status(StatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder priceType(PriceTypeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "price_type[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder date(DateParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "date[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder paidAt(PaidAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "paid_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder total(TotalParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "total[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder amountPaid(AmountPaidParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_paid[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder amountAdjusted(AmountAdjustedParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_adjusted[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder creditsApplied(CreditsAppliedParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "credits_applied[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder amountDue(AmountDueParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_due[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder dunningStatus(DunningStatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "dunning_status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder channel(ChannelParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceParams build() {
-        return new InvoiceParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class RecurringParams {
-
-    private final Map<String, Object> formData;
-
-    private RecurringParams(RecurringBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for RecurringParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static RecurringBuilder builder() {
-      return new RecurringBuilder();
-    }
-
-    public static final class RecurringBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private RecurringBuilder() {}
-
-      public RecurringBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public RecurringParams build() {
-        return new RecurringParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatusParams {
-
-    private final Map<String, Object> formData;
-
-    private StatusParams(StatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatusBuilder builder() {
-      return new StatusBuilder();
-    }
-
-    public static final class StatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatusBuilder() {}
-
-      public StatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public StatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public StatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public StatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public StatusParams build() {
-        return new StatusParams(this);
-      }
-    }
-
-    public enum Is {
-      PAID("paid"),
-
-      POSTED("posted"),
-
-      PAYMENT_DUE("payment_due"),
-
-      NOT_PAID("not_paid"),
-
-      VOIDED("voided"),
-
-      PENDING("pending"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      PAID("paid"),
-
-      POSTED("posted"),
-
-      PAYMENT_DUE("payment_due"),
-
-      NOT_PAID("not_paid"),
-
-      VOIDED("voided"),
-
-      PENDING("pending"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PriceTypeParams {
-
-    private final Map<String, Object> formData;
-
-    private PriceTypeParams(PriceTypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PriceTypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PriceTypeBuilder builder() {
-      return new PriceTypeBuilder();
-    }
-
-    public static final class PriceTypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PriceTypeBuilder() {}
-
-      public PriceTypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PriceTypeParams build() {
-        return new PriceTypeParams(this);
-      }
-    }
-
-    public enum Is {
-      TAX_EXCLUSIVE("tax_exclusive"),
-
-      TAX_INCLUSIVE("tax_inclusive"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      TAX_EXCLUSIVE("tax_exclusive"),
-
-      TAX_INCLUSIVE("tax_inclusive"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DateParams {
-
-    private final Map<String, Object> formData;
-
-    private DateParams(DateBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DateParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DateBuilder builder() {
-      return new DateBuilder();
-    }
-
-    public static final class DateBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DateBuilder() {}
-
-      public DateBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public DateBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public DateBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public DateBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public DateParams build() {
-        return new DateParams(this);
-      }
-    }
-  }
-
-  public static final class PaidAtParams {
-
-    private final Map<String, Object> formData;
-
-    private PaidAtParams(PaidAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaidAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaidAtBuilder builder() {
-      return new PaidAtBuilder();
-    }
-
-    public static final class PaidAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaidAtBuilder() {}
-
-      public PaidAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public PaidAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public PaidAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public PaidAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public PaidAtParams build() {
-        return new PaidAtParams(this);
-      }
-    }
-  }
-
-  public static final class TotalParams {
-
-    private final Map<String, Object> formData;
-
-    private TotalParams(TotalBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TotalParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TotalBuilder builder() {
-      return new TotalBuilder();
-    }
-
-    public static final class TotalBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TotalBuilder() {}
-
-      public TotalBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TotalBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TotalBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public TotalBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public TotalBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public TotalBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public TotalBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public TotalParams build() {
-        return new TotalParams(this);
-      }
-    }
-  }
-
-  public static final class AmountPaidParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountPaidParams(AmountPaidBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountPaidParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountPaidBuilder builder() {
-      return new AmountPaidBuilder();
-    }
-
-    public static final class AmountPaidBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountPaidBuilder() {}
-
-      public AmountPaidBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountPaidParams build() {
-        return new AmountPaidParams(this);
-      }
-    }
-  }
-
-  public static final class AmountAdjustedParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountAdjustedParams(AmountAdjustedBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountAdjustedParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountAdjustedBuilder builder() {
-      return new AmountAdjustedBuilder();
-    }
-
-    public static final class AmountAdjustedBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountAdjustedBuilder() {}
-
-      public AmountAdjustedBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountAdjustedParams build() {
-        return new AmountAdjustedParams(this);
-      }
-    }
-  }
-
-  public static final class CreditsAppliedParams {
-
-    private final Map<String, Object> formData;
-
-    private CreditsAppliedParams(CreditsAppliedBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreditsAppliedParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreditsAppliedBuilder builder() {
-      return new CreditsAppliedBuilder();
-    }
-
-    public static final class CreditsAppliedBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreditsAppliedBuilder() {}
-
-      public CreditsAppliedBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public CreditsAppliedParams build() {
-        return new CreditsAppliedParams(this);
-      }
-    }
-  }
-
-  public static final class AmountDueParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountDueParams(AmountDueBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountDueParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountDueBuilder builder() {
-      return new AmountDueBuilder();
-    }
-
-    public static final class AmountDueBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountDueBuilder() {}
-
-      public AmountDueBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountDueParams build() {
-        return new AmountDueParams(this);
-      }
-    }
-  }
-
-  public static final class DunningStatusParams {
-
-    private final Map<String, Object> formData;
-
-    private DunningStatusParams(DunningStatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DunningStatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DunningStatusBuilder builder() {
-      return new DunningStatusBuilder();
-    }
-
-    public static final class DunningStatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DunningStatusBuilder() {}
-
-      public DunningStatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public DunningStatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public DunningStatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public DunningStatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public DunningStatusBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public DunningStatusParams build() {
-        return new DunningStatusParams(this);
-      }
-    }
-
-    public enum Is {
-      IN_PROGRESS("in_progress"),
-
-      EXHAUSTED("exhausted"),
-
-      STOPPED("stopped"),
-
-      SUCCESS("success"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      IN_PROGRESS("in_progress"),
-
-      EXHAUSTED("exhausted"),
-
-      STOPPED("stopped"),
-
-      SUCCESS("success"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class ChannelParams {
-
-    private final Map<String, Object> formData;
-
-    private ChannelParams(ChannelBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChannelParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChannelBuilder builder() {
-      return new ChannelBuilder();
-    }
-
-    public static final class ChannelBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChannelBuilder() {}
-
-      public ChannelBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ChannelBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ChannelBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ChannelBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ChannelParams build() {
-        return new ChannelParams(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(ExportIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder customerId(CustomerIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "customer_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder status(ExportStatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder cancelReason(CancelReasonParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "cancel_reason[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder remainingBillingCycles(RemainingBillingCyclesParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "remaining_billing_cycles[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder createdAt(CreatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "created_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder activatedAt(ActivatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "activated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder nextBillingAt(NextBillingAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "next_billing_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder cancelledAt(CancelledAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "cancelled_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder hasScheduledChanges(HasScheduledChangesParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "has_scheduled_changes[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder updatedAt(ExportUpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethodParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "offline_payment_method[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder autoCloseInvoices(AutoCloseInvoicesParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "auto_close_invoices[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder channel(ExportChannelParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder planId(PlanIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "plan_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-  }
-
-  public static final class ExportIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportIdParams(ExportIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportIdBuilder builder() {
-      return new ExportIdBuilder();
-    }
-
-    public static final class ExportIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportIdBuilder() {}
-
-      public ExportIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ExportIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ExportIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ExportIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ExportIdParams build() {
-        return new ExportIdParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerIdParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerIdParams(CustomerIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerIdBuilder builder() {
-      return new CustomerIdBuilder();
-    }
-
-    public static final class CustomerIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerIdBuilder() {}
-
-      public CustomerIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CustomerIdParams build() {
-        return new CustomerIdParams(this);
-      }
-    }
-  }
-
-  public static final class ExportStatusParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportStatusParams(ExportStatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportStatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportStatusBuilder builder() {
-      return new ExportStatusBuilder();
-    }
-
-    public static final class ExportStatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportStatusBuilder() {}
-
-      public ExportStatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportStatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ExportStatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ExportStatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ExportStatusParams build() {
-        return new ExportStatusParams(this);
-      }
-    }
-
-    public enum Is {
-      FUTURE("future"),
-
-      IN_TRIAL("in_trial"),
-
-      ACTIVE("active"),
-
-      NON_RENEWING("non_renewing"),
-
-      PAUSED("paused"),
-
-      CANCELLED("cancelled"),
-
-      TRANSFERRED("transferred"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      FUTURE("future"),
-
-      IN_TRIAL("in_trial"),
-
-      ACTIVE("active"),
-
-      NON_RENEWING("non_renewing"),
-
-      PAUSED("paused"),
-
-      CANCELLED("cancelled"),
-
-      TRANSFERRED("transferred"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CancelReasonParams {
-
-    private final Map<String, Object> formData;
-
-    private CancelReasonParams(CancelReasonBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CancelReasonParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CancelReasonBuilder builder() {
-      return new CancelReasonBuilder();
-    }
-
-    public static final class CancelReasonBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CancelReasonBuilder() {}
-
-      public CancelReasonBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CancelReasonBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CancelReasonBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CancelReasonBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CancelReasonBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public CancelReasonParams build() {
-        return new CancelReasonParams(this);
-      }
-    }
-
-    public enum Is {
-      NOT_PAID("not_paid"),
-
-      NO_CARD("no_card"),
-
-      FRAUD_REVIEW_FAILED("fraud_review_failed"),
-
-      NON_COMPLIANT_EU_CUSTOMER("non_compliant_eu_customer"),
-
-      TAX_CALCULATION_FAILED("tax_calculation_failed"),
-
-      CURRENCY_INCOMPATIBLE_WITH_GATEWAY("currency_incompatible_with_gateway"),
-
-      NON_COMPLIANT_CUSTOMER("non_compliant_customer"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      NOT_PAID("not_paid"),
-
-      NO_CARD("no_card"),
-
-      FRAUD_REVIEW_FAILED("fraud_review_failed"),
-
-      NON_COMPLIANT_EU_CUSTOMER("non_compliant_eu_customer"),
-
-      TAX_CALCULATION_FAILED("tax_calculation_failed"),
-
-      CURRENCY_INCOMPATIBLE_WITH_GATEWAY("currency_incompatible_with_gateway"),
-
-      NON_COMPLIANT_CUSTOMER("non_compliant_customer"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class RemainingBillingCyclesParams {
-
-    private final Map<String, Object> formData;
-
-    private RemainingBillingCyclesParams(RemainingBillingCyclesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for RemainingBillingCyclesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static RemainingBillingCyclesBuilder builder() {
-      return new RemainingBillingCyclesBuilder();
-    }
-
-    public static final class RemainingBillingCyclesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private RemainingBillingCyclesBuilder() {}
-
-      public RemainingBillingCyclesBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesParams build() {
-        return new RemainingBillingCyclesParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CreatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private CreatedAtParams(CreatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreatedAtBuilder builder() {
-      return new CreatedAtBuilder();
-    }
-
-    public static final class CreatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreatedAtBuilder() {}
-
-      public CreatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public CreatedAtParams build() {
-        return new CreatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class ActivatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private ActivatedAtParams(ActivatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ActivatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ActivatedAtBuilder builder() {
-      return new ActivatedAtBuilder();
-    }
-
-    public static final class ActivatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ActivatedAtBuilder() {}
-
-      public ActivatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public ActivatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public ActivatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public ActivatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public ActivatedAtBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public ActivatedAtParams build() {
-        return new ActivatedAtParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class NextBillingAtParams {
-
-    private final Map<String, Object> formData;
-
-    private NextBillingAtParams(NextBillingAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NextBillingAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NextBillingAtBuilder builder() {
-      return new NextBillingAtBuilder();
-    }
-
-    public static final class NextBillingAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NextBillingAtBuilder() {}
-
-      public NextBillingAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public NextBillingAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public NextBillingAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public NextBillingAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public NextBillingAtParams build() {
-        return new NextBillingAtParams(this);
-      }
-    }
-  }
-
-  public static final class CancelledAtParams {
-
-    private final Map<String, Object> formData;
-
-    private CancelledAtParams(CancelledAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CancelledAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CancelledAtBuilder builder() {
-      return new CancelledAtBuilder();
-    }
-
-    public static final class CancelledAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CancelledAtBuilder() {}
-
-      public CancelledAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public CancelledAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public CancelledAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public CancelledAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public CancelledAtParams build() {
-        return new CancelledAtParams(this);
-      }
-    }
-  }
-
-  public static final class HasScheduledChangesParams {
-
-    private final Map<String, Object> formData;
-
-    private HasScheduledChangesParams(HasScheduledChangesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for HasScheduledChangesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static HasScheduledChangesBuilder builder() {
-      return new HasScheduledChangesBuilder();
-    }
-
-    public static final class HasScheduledChangesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private HasScheduledChangesBuilder() {}
-
-      public HasScheduledChangesBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public HasScheduledChangesParams build() {
-        return new HasScheduledChangesParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ExportUpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportUpdatedAtParams(ExportUpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportUpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportUpdatedAtBuilder builder() {
-      return new ExportUpdatedAtBuilder();
-    }
-
-    public static final class ExportUpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportUpdatedAtBuilder() {}
-
-      public ExportUpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAtParams build() {
-        return new ExportUpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class OfflinePaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private OfflinePaymentMethodParams(OfflinePaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for OfflinePaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static OfflinePaymentMethodBuilder builder() {
-      return new OfflinePaymentMethodBuilder();
-    }
-
-    public static final class OfflinePaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private OfflinePaymentMethodBuilder() {}
-
-      public OfflinePaymentMethodBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodParams build() {
-        return new OfflinePaymentMethodParams(this);
-      }
-    }
-
-    public enum Is {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AutoCloseInvoicesParams {
-
-    private final Map<String, Object> formData;
-
-    private AutoCloseInvoicesParams(AutoCloseInvoicesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AutoCloseInvoicesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AutoCloseInvoicesBuilder builder() {
-      return new AutoCloseInvoicesBuilder();
-    }
-
-    public static final class AutoCloseInvoicesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AutoCloseInvoicesBuilder() {}
-
-      public AutoCloseInvoicesBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AutoCloseInvoicesParams build() {
-        return new AutoCloseInvoicesParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ExportChannelParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportChannelParams(ExportChannelBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportChannelParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportChannelBuilder builder() {
-      return new ExportChannelBuilder();
-    }
-
-    public static final class ExportChannelBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportChannelBuilder() {}
-
-      public ExportChannelBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportChannelBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ExportChannelBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ExportChannelBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ExportChannelParams build() {
-        return new ExportChannelParams(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PlanIdParams {
-
-    private final Map<String, Object> formData;
-
-    private PlanIdParams(PlanIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PlanIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PlanIdBuilder builder() {
-      return new PlanIdBuilder();
-    }
-
-    public static final class PlanIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PlanIdBuilder() {}
-
-      public PlanIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PlanIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PlanIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PlanIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PlanIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PlanIdParams build() {
-        return new PlanIdParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(ExportId2Params value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder firstName(FirstNameParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "first_name[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder lastName(LastNameParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "last_name[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder email(EmailParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "email[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder company(CompanyParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "company[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder phone(PhoneParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "phone[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder autoCollection(AutoCollectionParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "auto_collection[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder taxability(TaxabilityParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "taxability[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder createdAt(ExportCreatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "created_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder updatedAt(ExportUpdatedAt2Params value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder offlinePaymentMethod(ExportOfflinePaymentMethodParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "offline_payment_method[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder autoCloseInvoices(ExportAutoCloseInvoicesParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "auto_close_invoices[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder channel(ExportChannel2Params value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class ExportId2Params {
-
-    private final Map<String, Object> formData;
-
-    private ExportId2Params(ExportId2Builder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportId2Params. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportId2Builder builder() {
-      return new ExportId2Builder();
-    }
-
-    public static final class ExportId2Builder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportId2Builder() {}
-
-      public ExportId2Builder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportId2Builder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ExportId2Builder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ExportId2Builder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ExportId2Builder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ExportId2Params build() {
-        return new ExportId2Params(this);
-      }
-    }
-  }
-
-  public static final class FirstNameParams {
-
-    private final Map<String, Object> formData;
-
-    private FirstNameParams(FirstNameBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for FirstNameParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static FirstNameBuilder builder() {
-      return new FirstNameBuilder();
-    }
-
-    public static final class FirstNameBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private FirstNameBuilder() {}
-
-      public FirstNameBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public FirstNameBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public FirstNameBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public FirstNameBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public FirstNameParams build() {
-        return new FirstNameParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class LastNameParams {
-
-    private final Map<String, Object> formData;
-
-    private LastNameParams(LastNameBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LastNameParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LastNameBuilder builder() {
-      return new LastNameBuilder();
-    }
-
-    public static final class LastNameBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LastNameBuilder() {}
-
-      public LastNameBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public LastNameBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public LastNameBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public LastNameBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public LastNameParams build() {
-        return new LastNameParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class EmailParams {
-
-    private final Map<String, Object> formData;
-
-    private EmailParams(EmailBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EmailParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EmailBuilder builder() {
-      return new EmailBuilder();
-    }
-
-    public static final class EmailBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EmailBuilder() {}
-
-      public EmailBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public EmailBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public EmailBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public EmailBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public EmailParams build() {
-        return new EmailParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CompanyParams {
-
-    private final Map<String, Object> formData;
-
-    private CompanyParams(CompanyBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CompanyParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CompanyBuilder builder() {
-      return new CompanyBuilder();
-    }
-
-    public static final class CompanyBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CompanyBuilder() {}
-
-      public CompanyBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CompanyBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CompanyBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CompanyBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public CompanyParams build() {
-        return new CompanyParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PhoneParams {
-
-    private final Map<String, Object> formData;
-
-    private PhoneParams(PhoneBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PhoneParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PhoneBuilder builder() {
-      return new PhoneBuilder();
-    }
-
-    public static final class PhoneBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PhoneBuilder() {}
-
-      public PhoneBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PhoneBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PhoneBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PhoneBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public PhoneParams build() {
-        return new PhoneParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AutoCollectionParams {
-
-    private final Map<String, Object> formData;
-
-    private AutoCollectionParams(AutoCollectionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AutoCollectionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AutoCollectionBuilder builder() {
-      return new AutoCollectionBuilder();
-    }
-
-    public static final class AutoCollectionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AutoCollectionBuilder() {}
-
-      public AutoCollectionBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AutoCollectionBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AutoCollectionBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public AutoCollectionBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public AutoCollectionParams build() {
-        return new AutoCollectionParams(this);
-      }
-    }
-
-    public enum Is {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxabilityParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxabilityParams(TaxabilityBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxabilityParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxabilityBuilder builder() {
-      return new TaxabilityBuilder();
-    }
-
-    public static final class TaxabilityBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxabilityBuilder() {}
-
-      public TaxabilityBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TaxabilityBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TaxabilityBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public TaxabilityBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public TaxabilityParams build() {
-        return new TaxabilityParams(this);
-      }
-    }
-
-    public enum Is {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ExportCreatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportCreatedAtParams(ExportCreatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportCreatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportCreatedAtBuilder builder() {
-      return new ExportCreatedAtBuilder();
-    }
-
-    public static final class ExportCreatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportCreatedAtBuilder() {}
-
-      public ExportCreatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public ExportCreatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public ExportCreatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public ExportCreatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public ExportCreatedAtParams build() {
-        return new ExportCreatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class ExportUpdatedAt2Params {
-
-    private final Map<String, Object> formData;
-
-    private ExportUpdatedAt2Params(ExportUpdatedAt2Builder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportUpdatedAt2Params. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportUpdatedAt2Builder builder() {
-      return new ExportUpdatedAt2Builder();
-    }
-
-    public static final class ExportUpdatedAt2Builder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportUpdatedAt2Builder() {}
-
-      public ExportUpdatedAt2Builder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAt2Builder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAt2Builder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAt2Builder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAt2Params build() {
-        return new ExportUpdatedAt2Params(this);
-      }
-    }
-  }
-
-  public static final class ExportOfflinePaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportOfflinePaymentMethodParams(ExportOfflinePaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportOfflinePaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportOfflinePaymentMethodBuilder builder() {
-      return new ExportOfflinePaymentMethodBuilder();
-    }
-
-    public static final class ExportOfflinePaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportOfflinePaymentMethodBuilder() {}
-
-      public ExportOfflinePaymentMethodBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportOfflinePaymentMethodBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ExportOfflinePaymentMethodBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ExportOfflinePaymentMethodBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ExportOfflinePaymentMethodParams build() {
-        return new ExportOfflinePaymentMethodParams(this);
-      }
-    }
-
-    public enum Is {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ExportAutoCloseInvoicesParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportAutoCloseInvoicesParams(ExportAutoCloseInvoicesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportAutoCloseInvoicesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportAutoCloseInvoicesBuilder builder() {
-      return new ExportAutoCloseInvoicesBuilder();
-    }
-
-    public static final class ExportAutoCloseInvoicesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportAutoCloseInvoicesBuilder() {}
-
-      public ExportAutoCloseInvoicesBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportAutoCloseInvoicesParams build() {
-        return new ExportAutoCloseInvoicesParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ExportChannel2Params {
-
-    private final Map<String, Object> formData;
-
-    private ExportChannel2Params(ExportChannel2Builder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportChannel2Params. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportChannel2Builder builder() {
-      return new ExportChannel2Builder();
-    }
-
-    public static final class ExportChannel2Builder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportChannel2Builder() {}
-
-      public ExportChannel2Builder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportChannel2Builder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ExportChannel2Builder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ExportChannel2Builder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ExportChannel2Params build() {
-        return new ExportChannel2Params(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class RelationshipParams {
-
-    private final Map<String, Object> formData;
-
-    private RelationshipParams(RelationshipBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for RelationshipParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static RelationshipBuilder builder() {
-      return new RelationshipBuilder();
-    }
-
-    public static final class RelationshipBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private RelationshipBuilder() {}
-
-      public RelationshipBuilder parentId(ParentIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "parent_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public RelationshipBuilder paymentOwnerId(PaymentOwnerIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "payment_owner_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public RelationshipBuilder invoiceOwnerId(InvoiceOwnerIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "invoice_owner_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public RelationshipParams build() {
-        return new RelationshipParams(this);
-      }
-    }
-  }
-
-  public static final class ParentIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ParentIdParams(ParentIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ParentIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ParentIdBuilder builder() {
-      return new ParentIdBuilder();
-    }
-
-    public static final class ParentIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ParentIdBuilder() {}
-
-      public ParentIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ParentIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ParentIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ParentIdParams build() {
-        return new ParentIdParams(this);
-      }
-    }
-  }
-
-  public static final class PaymentOwnerIdParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentOwnerIdParams(PaymentOwnerIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentOwnerIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentOwnerIdBuilder builder() {
-      return new PaymentOwnerIdBuilder();
-    }
-
-    public static final class PaymentOwnerIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentOwnerIdBuilder() {}
-
-      public PaymentOwnerIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PaymentOwnerIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PaymentOwnerIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PaymentOwnerIdParams build() {
-        return new PaymentOwnerIdParams(this);
-      }
-    }
-  }
-
-  public static final class InvoiceOwnerIdParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceOwnerIdParams(InvoiceOwnerIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceOwnerIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceOwnerIdBuilder builder() {
-      return new InvoiceOwnerIdBuilder();
-    }
-
-    public static final class InvoiceOwnerIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceOwnerIdBuilder() {}
-
-      public InvoiceOwnerIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public InvoiceOwnerIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public InvoiceOwnerIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public InvoiceOwnerIdParams build() {
-        return new InvoiceOwnerIdParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportDifferentialPricesParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportDifferentialPricesParams.java
deleted file mode 100644
index f4342f3d..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportDifferentialPricesParams.java
+++ /dev/null
@@ -1,388 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportDifferentialPricesParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportDifferentialPricesParams(ExportDifferentialPricesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportDifferentialPricesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportDifferentialPricesBuilder builder() {
-    return new ExportDifferentialPricesBuilder();
-  }
-
-  public static final class ExportDifferentialPricesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportDifferentialPricesBuilder() {}
-
-    public ExportDifferentialPricesBuilder itemId(ItemIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportDifferentialPricesBuilder differentialPrice(DifferentialPriceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "differential_price[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportDifferentialPricesParams build() {
-      return new ExportDifferentialPricesParams(this);
-    }
-  }
-
-  public static final class ItemIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemIdParams(ItemIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemIdBuilder builder() {
-      return new ItemIdBuilder();
-    }
-
-    public static final class ItemIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemIdBuilder() {}
-
-      public ItemIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemIdParams build() {
-        return new ItemIdParams(this);
-      }
-    }
-  }
-
-  public static final class DifferentialPriceParams {
-
-    private final Map<String, Object> formData;
-
-    private DifferentialPriceParams(DifferentialPriceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DifferentialPriceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DifferentialPriceBuilder builder() {
-      return new DifferentialPriceBuilder();
-    }
-
-    public static final class DifferentialPriceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DifferentialPriceBuilder() {}
-
-      public DifferentialPriceBuilder itemPriceId(ItemPriceIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "item_price_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public DifferentialPriceBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public DifferentialPriceBuilder parentItemId(ParentItemIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "parent_item_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public DifferentialPriceParams build() {
-        return new DifferentialPriceParams(this);
-      }
-    }
-  }
-
-  public static final class ItemPriceIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemPriceIdParams(ItemPriceIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemPriceIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemPriceIdBuilder builder() {
-      return new ItemPriceIdBuilder();
-    }
-
-    public static final class ItemPriceIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemPriceIdBuilder() {}
-
-      public ItemPriceIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemPriceIdParams build() {
-        return new ItemPriceIdParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class ParentItemIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ParentItemIdParams(ParentItemIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ParentItemIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ParentItemIdBuilder builder() {
-      return new ParentItemIdBuilder();
-    }
-
-    public static final class ParentItemIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ParentItemIdBuilder() {}
-
-      public ParentItemIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ParentItemIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ParentItemIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ParentItemIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ParentItemIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ParentItemIdParams build() {
-        return new ParentItemIdParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportInvoicesParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportInvoicesParams.java
deleted file mode 100644
index 60ade2df..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportInvoicesParams.java
+++ /dev/null
@@ -1,1719 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportInvoicesParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportInvoicesParams(ExportInvoicesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportInvoicesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportInvoicesBuilder builder() {
-    return new ExportInvoicesBuilder();
-  }
-
-  public static final class ExportInvoicesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportInvoicesBuilder() {}
-
-    public ExportInvoicesBuilder paymentOwner(PaymentOwnerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_owner[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportInvoicesBuilder invoice(InvoiceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "invoice[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportInvoicesParams build() {
-      return new ExportInvoicesParams(this);
-    }
-  }
-
-  public static final class PaymentOwnerParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentOwnerParams(PaymentOwnerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentOwnerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentOwnerBuilder builder() {
-      return new PaymentOwnerBuilder();
-    }
-
-    public static final class PaymentOwnerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentOwnerBuilder() {}
-
-      public PaymentOwnerBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PaymentOwnerBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PaymentOwnerBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PaymentOwnerBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PaymentOwnerBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PaymentOwnerParams build() {
-        return new PaymentOwnerParams(this);
-      }
-    }
-  }
-
-  public static final class InvoiceParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceParams(InvoiceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceBuilder builder() {
-      return new InvoiceBuilder();
-    }
-
-    public static final class InvoiceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceBuilder() {}
-
-      public InvoiceBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder subscriptionId(SubscriptionIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "subscription_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder customerId(CustomerIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "customer_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder recurring(RecurringParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "recurring[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder status(StatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder priceType(PriceTypeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "price_type[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder date(DateParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "date[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder paidAt(PaidAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "paid_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder total(TotalParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "total[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder amountPaid(AmountPaidParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_paid[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder amountAdjusted(AmountAdjustedParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_adjusted[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder creditsApplied(CreditsAppliedParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "credits_applied[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder amountDue(AmountDueParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_due[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder dunningStatus(DunningStatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "dunning_status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder channel(ChannelParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceParams build() {
-        return new InvoiceParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionIdParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionIdParams(SubscriptionIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionIdBuilder builder() {
-      return new SubscriptionIdBuilder();
-    }
-
-    public static final class SubscriptionIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionIdBuilder() {}
-
-      public SubscriptionIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public SubscriptionIdParams build() {
-        return new SubscriptionIdParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerIdParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerIdParams(CustomerIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerIdBuilder builder() {
-      return new CustomerIdBuilder();
-    }
-
-    public static final class CustomerIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerIdBuilder() {}
-
-      public CustomerIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CustomerIdParams build() {
-        return new CustomerIdParams(this);
-      }
-    }
-  }
-
-  public static final class RecurringParams {
-
-    private final Map<String, Object> formData;
-
-    private RecurringParams(RecurringBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for RecurringParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static RecurringBuilder builder() {
-      return new RecurringBuilder();
-    }
-
-    public static final class RecurringBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private RecurringBuilder() {}
-
-      public RecurringBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public RecurringParams build() {
-        return new RecurringParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatusParams {
-
-    private final Map<String, Object> formData;
-
-    private StatusParams(StatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatusBuilder builder() {
-      return new StatusBuilder();
-    }
-
-    public static final class StatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatusBuilder() {}
-
-      public StatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public StatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public StatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public StatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public StatusParams build() {
-        return new StatusParams(this);
-      }
-    }
-
-    public enum Is {
-      PAID("paid"),
-
-      POSTED("posted"),
-
-      PAYMENT_DUE("payment_due"),
-
-      NOT_PAID("not_paid"),
-
-      VOIDED("voided"),
-
-      PENDING("pending"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      PAID("paid"),
-
-      POSTED("posted"),
-
-      PAYMENT_DUE("payment_due"),
-
-      NOT_PAID("not_paid"),
-
-      VOIDED("voided"),
-
-      PENDING("pending"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PriceTypeParams {
-
-    private final Map<String, Object> formData;
-
-    private PriceTypeParams(PriceTypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PriceTypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PriceTypeBuilder builder() {
-      return new PriceTypeBuilder();
-    }
-
-    public static final class PriceTypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PriceTypeBuilder() {}
-
-      public PriceTypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PriceTypeParams build() {
-        return new PriceTypeParams(this);
-      }
-    }
-
-    public enum Is {
-      TAX_EXCLUSIVE("tax_exclusive"),
-
-      TAX_INCLUSIVE("tax_inclusive"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      TAX_EXCLUSIVE("tax_exclusive"),
-
-      TAX_INCLUSIVE("tax_inclusive"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DateParams {
-
-    private final Map<String, Object> formData;
-
-    private DateParams(DateBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DateParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DateBuilder builder() {
-      return new DateBuilder();
-    }
-
-    public static final class DateBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DateBuilder() {}
-
-      public DateBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public DateBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public DateBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public DateBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public DateParams build() {
-        return new DateParams(this);
-      }
-    }
-  }
-
-  public static final class PaidAtParams {
-
-    private final Map<String, Object> formData;
-
-    private PaidAtParams(PaidAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaidAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaidAtBuilder builder() {
-      return new PaidAtBuilder();
-    }
-
-    public static final class PaidAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaidAtBuilder() {}
-
-      public PaidAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public PaidAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public PaidAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public PaidAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public PaidAtParams build() {
-        return new PaidAtParams(this);
-      }
-    }
-  }
-
-  public static final class TotalParams {
-
-    private final Map<String, Object> formData;
-
-    private TotalParams(TotalBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TotalParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TotalBuilder builder() {
-      return new TotalBuilder();
-    }
-
-    public static final class TotalBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TotalBuilder() {}
-
-      public TotalBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TotalBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TotalBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public TotalBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public TotalBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public TotalBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public TotalBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public TotalParams build() {
-        return new TotalParams(this);
-      }
-    }
-  }
-
-  public static final class AmountPaidParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountPaidParams(AmountPaidBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountPaidParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountPaidBuilder builder() {
-      return new AmountPaidBuilder();
-    }
-
-    public static final class AmountPaidBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountPaidBuilder() {}
-
-      public AmountPaidBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountPaidParams build() {
-        return new AmountPaidParams(this);
-      }
-    }
-  }
-
-  public static final class AmountAdjustedParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountAdjustedParams(AmountAdjustedBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountAdjustedParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountAdjustedBuilder builder() {
-      return new AmountAdjustedBuilder();
-    }
-
-    public static final class AmountAdjustedBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountAdjustedBuilder() {}
-
-      public AmountAdjustedBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountAdjustedParams build() {
-        return new AmountAdjustedParams(this);
-      }
-    }
-  }
-
-  public static final class CreditsAppliedParams {
-
-    private final Map<String, Object> formData;
-
-    private CreditsAppliedParams(CreditsAppliedBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreditsAppliedParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreditsAppliedBuilder builder() {
-      return new CreditsAppliedBuilder();
-    }
-
-    public static final class CreditsAppliedBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreditsAppliedBuilder() {}
-
-      public CreditsAppliedBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public CreditsAppliedParams build() {
-        return new CreditsAppliedParams(this);
-      }
-    }
-  }
-
-  public static final class AmountDueParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountDueParams(AmountDueBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountDueParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountDueBuilder builder() {
-      return new AmountDueBuilder();
-    }
-
-    public static final class AmountDueBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountDueBuilder() {}
-
-      public AmountDueBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountDueParams build() {
-        return new AmountDueParams(this);
-      }
-    }
-  }
-
-  public static final class DunningStatusParams {
-
-    private final Map<String, Object> formData;
-
-    private DunningStatusParams(DunningStatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DunningStatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DunningStatusBuilder builder() {
-      return new DunningStatusBuilder();
-    }
-
-    public static final class DunningStatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DunningStatusBuilder() {}
-
-      public DunningStatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public DunningStatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public DunningStatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public DunningStatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public DunningStatusBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public DunningStatusParams build() {
-        return new DunningStatusParams(this);
-      }
-    }
-
-    public enum Is {
-      IN_PROGRESS("in_progress"),
-
-      EXHAUSTED("exhausted"),
-
-      STOPPED("stopped"),
-
-      SUCCESS("success"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      IN_PROGRESS("in_progress"),
-
-      EXHAUSTED("exhausted"),
-
-      STOPPED("stopped"),
-
-      SUCCESS("success"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class ChannelParams {
-
-    private final Map<String, Object> formData;
-
-    private ChannelParams(ChannelBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChannelParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChannelBuilder builder() {
-      return new ChannelBuilder();
-    }
-
-    public static final class ChannelBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChannelBuilder() {}
-
-      public ChannelBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ChannelBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ChannelBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ChannelBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ChannelParams build() {
-        return new ChannelParams(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportItemFamiliesParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportItemFamiliesParams.java
deleted file mode 100644
index b1a33717..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportItemFamiliesParams.java
+++ /dev/null
@@ -1,451 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportItemFamiliesParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportItemFamiliesParams(ExportItemFamiliesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportItemFamiliesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportItemFamiliesBuilder builder() {
-    return new ExportItemFamiliesBuilder();
-  }
-
-  public static final class ExportItemFamiliesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportItemFamiliesBuilder() {}
-
-    public ExportItemFamiliesBuilder businessEntityId(BusinessEntityIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "business_entity_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportItemFamiliesBuilder includeSiteLevelResources(
-        IncludeSiteLevelResourcesParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "include_site_level_resources[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportItemFamiliesBuilder itemFamily(ItemFamilyParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_family[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportItemFamiliesParams build() {
-      return new ExportItemFamiliesParams(this);
-    }
-  }
-
-  public static final class BusinessEntityIdParams {
-
-    private final Map<String, Object> formData;
-
-    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BusinessEntityIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BusinessEntityIdBuilder builder() {
-      return new BusinessEntityIdBuilder();
-    }
-
-    public static final class BusinessEntityIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BusinessEntityIdBuilder() {}
-
-      public BusinessEntityIdBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdParams build() {
-        return new BusinessEntityIdParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class IncludeSiteLevelResourcesParams {
-
-    private final Map<String, Object> formData;
-
-    private IncludeSiteLevelResourcesParams(IncludeSiteLevelResourcesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IncludeSiteLevelResourcesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IncludeSiteLevelResourcesBuilder builder() {
-      return new IncludeSiteLevelResourcesBuilder();
-    }
-
-    public static final class IncludeSiteLevelResourcesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IncludeSiteLevelResourcesBuilder() {}
-
-      public IncludeSiteLevelResourcesBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IncludeSiteLevelResourcesParams build() {
-        return new IncludeSiteLevelResourcesParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemFamilyParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemFamilyParams(ItemFamilyBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemFamilyParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemFamilyBuilder builder() {
-      return new ItemFamilyBuilder();
-    }
-
-    public static final class ItemFamilyBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemFamilyBuilder() {}
-
-      public ItemFamilyBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemFamilyBuilder name(NameParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "name[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemFamilyBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemFamilyParams build() {
-        return new ItemFamilyParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class NameParams {
-
-    private final Map<String, Object> formData;
-
-    private NameParams(NameBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NameParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NameBuilder builder() {
-      return new NameBuilder();
-    }
-
-    public static final class NameBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NameBuilder() {}
-
-      public NameBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public NameBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public NameBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public NameParams build() {
-        return new NameParams(this);
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportItemPricesParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportItemPricesParams.java
deleted file mode 100644
index a782e253..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportItemPricesParams.java
+++ /dev/null
@@ -1,1731 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportItemPricesParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportItemPricesParams(ExportItemPricesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportItemPricesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportItemPricesBuilder builder() {
-    return new ExportItemPricesBuilder();
-  }
-
-  public static final class ExportItemPricesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportItemPricesBuilder() {}
-
-    public ExportItemPricesBuilder itemFamilyId(ItemFamilyIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_family_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportItemPricesBuilder itemType(ItemTypeParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_type[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportItemPricesBuilder currencyCode(CurrencyCodeParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "currency_code[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportItemPricesBuilder businessEntityId(BusinessEntityIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "business_entity_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportItemPricesBuilder includeSiteLevelResources(
-        IncludeSiteLevelResourcesParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "include_site_level_resources[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportItemPricesBuilder itemPrice(ItemPriceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_price[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportItemPricesParams build() {
-      return new ExportItemPricesParams(this);
-    }
-  }
-
-  public static final class ItemFamilyIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemFamilyIdParams(ItemFamilyIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemFamilyIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemFamilyIdBuilder builder() {
-      return new ItemFamilyIdBuilder();
-    }
-
-    public static final class ItemFamilyIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemFamilyIdBuilder() {}
-
-      public ItemFamilyIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemFamilyIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemFamilyIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ItemFamilyIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemFamilyIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemFamilyIdParams build() {
-        return new ItemFamilyIdParams(this);
-      }
-    }
-  }
-
-  public static final class ItemTypeParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTypeParams(ItemTypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTypeBuilder builder() {
-      return new ItemTypeBuilder();
-    }
-
-    public static final class ItemTypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTypeBuilder() {}
-
-      public ItemTypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemTypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemTypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemTypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemTypeParams build() {
-        return new ItemTypeParams(this);
-      }
-    }
-
-    public enum Is {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CurrencyCodeParams {
-
-    private final Map<String, Object> formData;
-
-    private CurrencyCodeParams(CurrencyCodeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CurrencyCodeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CurrencyCodeBuilder builder() {
-      return new CurrencyCodeBuilder();
-    }
-
-    public static final class CurrencyCodeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CurrencyCodeBuilder() {}
-
-      public CurrencyCodeBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CurrencyCodeParams build() {
-        return new CurrencyCodeParams(this);
-      }
-    }
-  }
-
-  public static final class BusinessEntityIdParams {
-
-    private final Map<String, Object> formData;
-
-    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BusinessEntityIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BusinessEntityIdBuilder builder() {
-      return new BusinessEntityIdBuilder();
-    }
-
-    public static final class BusinessEntityIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BusinessEntityIdBuilder() {}
-
-      public BusinessEntityIdBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdParams build() {
-        return new BusinessEntityIdParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class IncludeSiteLevelResourcesParams {
-
-    private final Map<String, Object> formData;
-
-    private IncludeSiteLevelResourcesParams(IncludeSiteLevelResourcesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IncludeSiteLevelResourcesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IncludeSiteLevelResourcesBuilder builder() {
-      return new IncludeSiteLevelResourcesBuilder();
-    }
-
-    public static final class IncludeSiteLevelResourcesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IncludeSiteLevelResourcesBuilder() {}
-
-      public IncludeSiteLevelResourcesBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IncludeSiteLevelResourcesParams build() {
-        return new IncludeSiteLevelResourcesParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemPriceParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemPriceParams(ItemPriceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemPriceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemPriceBuilder builder() {
-      return new ItemPriceBuilder();
-    }
-
-    public static final class ItemPriceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemPriceBuilder() {}
-
-      public ItemPriceBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemPriceBuilder name(NameParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "name[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemPriceBuilder pricingModel(PricingModelParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "pricing_model[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemPriceBuilder itemId(ItemIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "item_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemPriceBuilder priceVariantId(PriceVariantIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "price_variant_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemPriceBuilder trialPeriod(TrialPeriodParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "trial_period[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemPriceBuilder trialPeriodUnit(TrialPeriodUnitParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "trial_period_unit[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemPriceBuilder status(StatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemPriceBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemPriceBuilder periodUnit(PeriodUnitParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "period_unit[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemPriceBuilder period(PeriodParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "period[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemPriceBuilder channel(ChannelParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemPriceParams build() {
-        return new ItemPriceParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class NameParams {
-
-    private final Map<String, Object> formData;
-
-    private NameParams(NameBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NameParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NameBuilder builder() {
-      return new NameBuilder();
-    }
-
-    public static final class NameBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NameBuilder() {}
-
-      public NameBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public NameBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public NameBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public NameBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public NameBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public NameParams build() {
-        return new NameParams(this);
-      }
-    }
-  }
-
-  public static final class PricingModelParams {
-
-    private final Map<String, Object> formData;
-
-    private PricingModelParams(PricingModelBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PricingModelParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PricingModelBuilder builder() {
-      return new PricingModelBuilder();
-    }
-
-    public static final class PricingModelBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PricingModelBuilder() {}
-
-      public PricingModelBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PricingModelBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PricingModelBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PricingModelBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PricingModelParams build() {
-        return new PricingModelParams(this);
-      }
-    }
-
-    public enum Is {
-      FLAT_FEE("flat_fee"),
-
-      PER_UNIT("per_unit"),
-
-      TIERED("tiered"),
-
-      VOLUME("volume"),
-
-      STAIRSTEP("stairstep"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      FLAT_FEE("flat_fee"),
-
-      PER_UNIT("per_unit"),
-
-      TIERED("tiered"),
-
-      VOLUME("volume"),
-
-      STAIRSTEP("stairstep"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemIdParams(ItemIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemIdBuilder builder() {
-      return new ItemIdBuilder();
-    }
-
-    public static final class ItemIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemIdBuilder() {}
-
-      public ItemIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemIdParams build() {
-        return new ItemIdParams(this);
-      }
-    }
-  }
-
-  public static final class PriceVariantIdParams {
-
-    private final Map<String, Object> formData;
-
-    private PriceVariantIdParams(PriceVariantIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PriceVariantIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PriceVariantIdBuilder builder() {
-      return new PriceVariantIdBuilder();
-    }
-
-    public static final class PriceVariantIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PriceVariantIdBuilder() {}
-
-      public PriceVariantIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PriceVariantIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PriceVariantIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PriceVariantIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PriceVariantIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PriceVariantIdParams build() {
-        return new PriceVariantIdParams(this);
-      }
-    }
-  }
-
-  public static final class TrialPeriodParams {
-
-    private final Map<String, Object> formData;
-
-    private TrialPeriodParams(TrialPeriodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TrialPeriodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TrialPeriodBuilder builder() {
-      return new TrialPeriodBuilder();
-    }
-
-    public static final class TrialPeriodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TrialPeriodBuilder() {}
-
-      public TrialPeriodBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TrialPeriodBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TrialPeriodBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public TrialPeriodBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public TrialPeriodBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public TrialPeriodBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public TrialPeriodBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public TrialPeriodParams build() {
-        return new TrialPeriodParams(this);
-      }
-    }
-  }
-
-  public static final class TrialPeriodUnitParams {
-
-    private final Map<String, Object> formData;
-
-    private TrialPeriodUnitParams(TrialPeriodUnitBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TrialPeriodUnitParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TrialPeriodUnitBuilder builder() {
-      return new TrialPeriodUnitBuilder();
-    }
-
-    public static final class TrialPeriodUnitBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TrialPeriodUnitBuilder() {}
-
-      public TrialPeriodUnitBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TrialPeriodUnitBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TrialPeriodUnitBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public TrialPeriodUnitBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public TrialPeriodUnitParams build() {
-        return new TrialPeriodUnitParams(this);
-      }
-    }
-
-    public enum Is {
-      DAY("day"),
-
-      MONTH("month"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      DAY("day"),
-
-      MONTH("month"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatusParams {
-
-    private final Map<String, Object> formData;
-
-    private StatusParams(StatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatusBuilder builder() {
-      return new StatusBuilder();
-    }
-
-    public static final class StatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatusBuilder() {}
-
-      public StatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public StatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public StatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public StatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public StatusParams build() {
-        return new StatusParams(this);
-      }
-    }
-
-    public enum Is {
-      ACTIVE("active"),
-
-      ARCHIVED("archived"),
-
-      DELETED("deleted"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ACTIVE("active"),
-
-      ARCHIVED("archived"),
-
-      DELETED("deleted"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class PeriodUnitParams {
-
-    private final Map<String, Object> formData;
-
-    private PeriodUnitParams(PeriodUnitBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PeriodUnitParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PeriodUnitBuilder builder() {
-      return new PeriodUnitBuilder();
-    }
-
-    public static final class PeriodUnitBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PeriodUnitBuilder() {}
-
-      public PeriodUnitBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PeriodUnitBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PeriodUnitBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PeriodUnitBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PeriodUnitParams build() {
-        return new PeriodUnitParams(this);
-      }
-    }
-
-    public enum Is {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PeriodParams {
-
-    private final Map<String, Object> formData;
-
-    private PeriodParams(PeriodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PeriodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PeriodBuilder builder() {
-      return new PeriodBuilder();
-    }
-
-    public static final class PeriodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PeriodBuilder() {}
-
-      public PeriodBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PeriodBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PeriodBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public PeriodBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public PeriodBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public PeriodBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public PeriodBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public PeriodParams build() {
-        return new PeriodParams(this);
-      }
-    }
-  }
-
-  public static final class ChannelParams {
-
-    private final Map<String, Object> formData;
-
-    private ChannelParams(ChannelBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChannelParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChannelBuilder builder() {
-      return new ChannelBuilder();
-    }
-
-    public static final class ChannelBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChannelBuilder() {}
-
-      public ChannelBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ChannelBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ChannelBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ChannelBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ChannelParams build() {
-        return new ChannelParams(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportItemsParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportItemsParams.java
deleted file mode 100644
index c72bfb26..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportItemsParams.java
+++ /dev/null
@@ -1,1471 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportItemsParams(ExportItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportItemsBuilder builder() {
-    return new ExportItemsBuilder();
-  }
-
-  public static final class ExportItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportItemsBuilder() {}
-
-    public ExportItemsBuilder businessEntityId(BusinessEntityIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "business_entity_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportItemsBuilder includeSiteLevelResources(IncludeSiteLevelResourcesParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "include_site_level_resources[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportItemsBuilder item(ItemParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportItemsParams build() {
-      return new ExportItemsParams(this);
-    }
-  }
-
-  public static final class BusinessEntityIdParams {
-
-    private final Map<String, Object> formData;
-
-    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BusinessEntityIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BusinessEntityIdBuilder builder() {
-      return new BusinessEntityIdBuilder();
-    }
-
-    public static final class BusinessEntityIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BusinessEntityIdBuilder() {}
-
-      public BusinessEntityIdBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdParams build() {
-        return new BusinessEntityIdParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class IncludeSiteLevelResourcesParams {
-
-    private final Map<String, Object> formData;
-
-    private IncludeSiteLevelResourcesParams(IncludeSiteLevelResourcesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IncludeSiteLevelResourcesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IncludeSiteLevelResourcesBuilder builder() {
-      return new IncludeSiteLevelResourcesBuilder();
-    }
-
-    public static final class IncludeSiteLevelResourcesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IncludeSiteLevelResourcesBuilder() {}
-
-      public IncludeSiteLevelResourcesBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IncludeSiteLevelResourcesParams build() {
-        return new IncludeSiteLevelResourcesParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemParams(ItemBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemBuilder builder() {
-      return new ItemBuilder();
-    }
-
-    public static final class ItemBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemBuilder() {}
-
-      public ItemBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemBuilder itemFamilyId(ItemFamilyIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "item_family_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemBuilder type(TypeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "type[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemBuilder name(NameParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "name[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemBuilder itemApplicability(ItemApplicabilityParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "item_applicability[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemBuilder status(StatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemBuilder isGiftable(IsGiftableParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "is_giftable[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemBuilder enabledForCheckout(EnabledForCheckoutParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "enabled_for_checkout[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemBuilder enabledInPortal(EnabledInPortalParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "enabled_in_portal[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemBuilder metered(MeteredParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "metered[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemBuilder usageCalculation(UsageCalculationParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "usage_calculation[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemBuilder channel(ChannelParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public ItemParams build() {
-        return new ItemParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class ItemFamilyIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemFamilyIdParams(ItemFamilyIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemFamilyIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemFamilyIdBuilder builder() {
-      return new ItemFamilyIdBuilder();
-    }
-
-    public static final class ItemFamilyIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemFamilyIdBuilder() {}
-
-      public ItemFamilyIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemFamilyIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemFamilyIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ItemFamilyIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemFamilyIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemFamilyIdParams build() {
-        return new ItemFamilyIdParams(this);
-      }
-    }
-  }
-
-  public static final class TypeParams {
-
-    private final Map<String, Object> formData;
-
-    private TypeParams(TypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TypeBuilder builder() {
-      return new TypeBuilder();
-    }
-
-    public static final class TypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TypeBuilder() {}
-
-      public TypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public TypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public TypeParams build() {
-        return new TypeParams(this);
-      }
-    }
-
-    public enum Is {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class NameParams {
-
-    private final Map<String, Object> formData;
-
-    private NameParams(NameBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NameParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NameBuilder builder() {
-      return new NameBuilder();
-    }
-
-    public static final class NameBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NameBuilder() {}
-
-      public NameBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public NameBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public NameBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public NameParams build() {
-        return new NameParams(this);
-      }
-    }
-  }
-
-  public static final class ItemApplicabilityParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemApplicabilityParams(ItemApplicabilityBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemApplicabilityParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemApplicabilityBuilder builder() {
-      return new ItemApplicabilityBuilder();
-    }
-
-    public static final class ItemApplicabilityBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemApplicabilityBuilder() {}
-
-      public ItemApplicabilityBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemApplicabilityBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemApplicabilityBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemApplicabilityBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemApplicabilityParams build() {
-        return new ItemApplicabilityParams(this);
-      }
-    }
-
-    public enum Is {
-      ALL("all"),
-
-      RESTRICTED("restricted"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ALL("all"),
-
-      RESTRICTED("restricted"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatusParams {
-
-    private final Map<String, Object> formData;
-
-    private StatusParams(StatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatusBuilder builder() {
-      return new StatusBuilder();
-    }
-
-    public static final class StatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatusBuilder() {}
-
-      public StatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public StatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public StatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public StatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public StatusParams build() {
-        return new StatusParams(this);
-      }
-    }
-
-    public enum Is {
-      ACTIVE("active"),
-
-      ARCHIVED("archived"),
-
-      DELETED("deleted"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ACTIVE("active"),
-
-      ARCHIVED("archived"),
-
-      DELETED("deleted"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class IsGiftableParams {
-
-    private final Map<String, Object> formData;
-
-    private IsGiftableParams(IsGiftableBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IsGiftableParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IsGiftableBuilder builder() {
-      return new IsGiftableBuilder();
-    }
-
-    public static final class IsGiftableBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IsGiftableBuilder() {}
-
-      public IsGiftableBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IsGiftableParams build() {
-        return new IsGiftableParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class EnabledForCheckoutParams {
-
-    private final Map<String, Object> formData;
-
-    private EnabledForCheckoutParams(EnabledForCheckoutBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EnabledForCheckoutParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EnabledForCheckoutBuilder builder() {
-      return new EnabledForCheckoutBuilder();
-    }
-
-    public static final class EnabledForCheckoutBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EnabledForCheckoutBuilder() {}
-
-      public EnabledForCheckoutBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public EnabledForCheckoutParams build() {
-        return new EnabledForCheckoutParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class EnabledInPortalParams {
-
-    private final Map<String, Object> formData;
-
-    private EnabledInPortalParams(EnabledInPortalBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EnabledInPortalParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EnabledInPortalBuilder builder() {
-      return new EnabledInPortalBuilder();
-    }
-
-    public static final class EnabledInPortalBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EnabledInPortalBuilder() {}
-
-      public EnabledInPortalBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public EnabledInPortalParams build() {
-        return new EnabledInPortalParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class MeteredParams {
-
-    private final Map<String, Object> formData;
-
-    private MeteredParams(MeteredBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for MeteredParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static MeteredBuilder builder() {
-      return new MeteredBuilder();
-    }
-
-    public static final class MeteredBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private MeteredBuilder() {}
-
-      public MeteredBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public MeteredParams build() {
-        return new MeteredParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class UsageCalculationParams {
-
-    private final Map<String, Object> formData;
-
-    private UsageCalculationParams(UsageCalculationBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UsageCalculationParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UsageCalculationBuilder builder() {
-      return new UsageCalculationBuilder();
-    }
-
-    public static final class UsageCalculationBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UsageCalculationBuilder() {}
-
-      public UsageCalculationBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public UsageCalculationBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public UsageCalculationBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public UsageCalculationBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public UsageCalculationParams build() {
-        return new UsageCalculationParams(this);
-      }
-    }
-
-    public enum Is {
-      SUM_OF_USAGES("sum_of_usages"),
-
-      LAST_USAGE("last_usage"),
-
-      MAX_USAGE("max_usage"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      SUM_OF_USAGES("sum_of_usages"),
-
-      LAST_USAGE("last_usage"),
-
-      MAX_USAGE("max_usage"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChannelParams {
-
-    private final Map<String, Object> formData;
-
-    private ChannelParams(ChannelBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChannelParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChannelBuilder builder() {
-      return new ChannelBuilder();
-    }
-
-    public static final class ChannelBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChannelBuilder() {}
-
-      public ChannelBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ChannelBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ChannelBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ChannelBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ChannelParams build() {
-        return new ChannelParams(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportOrdersParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportOrdersParams.java
deleted file mode 100644
index 661ebd9e..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportOrdersParams.java
+++ /dev/null
@@ -1,1674 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportOrdersParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportOrdersParams(ExportOrdersBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportOrdersParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportOrdersBuilder builder() {
-    return new ExportOrdersBuilder();
-  }
-
-  public static final class ExportOrdersBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportOrdersBuilder() {}
-
-    public ExportOrdersBuilder total(TotalParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "total[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportOrdersBuilder order(OrderParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "order[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportOrdersParams build() {
-      return new ExportOrdersParams(this);
-    }
-  }
-
-  public static final class TotalParams {
-
-    private final Map<String, Object> formData;
-
-    private TotalParams(TotalBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TotalParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TotalBuilder builder() {
-      return new TotalBuilder();
-    }
-
-    public static final class TotalBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TotalBuilder() {}
-
-      public TotalBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TotalBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TotalBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public TotalBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public TotalBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public TotalBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public TotalBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public TotalParams build() {
-        return new TotalParams(this);
-      }
-    }
-  }
-
-  public static final class OrderParams {
-
-    private final Map<String, Object> formData;
-
-    private OrderParams(OrderBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for OrderParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static OrderBuilder builder() {
-      return new OrderBuilder();
-    }
-
-    public static final class OrderBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private OrderBuilder() {}
-
-      public OrderBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder subscriptionId(SubscriptionIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "subscription_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder customerId(CustomerIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "customer_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder status(StatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder priceType(PriceTypeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "price_type[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder orderDate(OrderDateParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "order_date[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder shippingDate(ShippingDateParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "shipping_date[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder shippedAt(ShippedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "shipped_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder deliveredAt(DeliveredAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "delivered_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder cancelledAt(CancelledAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "cancelled_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder amountPaid(AmountPaidParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_paid[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder refundableCredits(RefundableCreditsParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "refundable_credits[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder refundableCreditsIssued(RefundableCreditsIssuedParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "refundable_credits_issued[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder resentStatus(ResentStatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "resent_status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder isResent(IsResentParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "is_resent[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderBuilder originalOrderId(OriginalOrderIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "original_order_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public OrderParams build() {
-        return new OrderParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionIdParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionIdParams(SubscriptionIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionIdBuilder builder() {
-      return new SubscriptionIdBuilder();
-    }
-
-    public static final class SubscriptionIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionIdBuilder() {}
-
-      public SubscriptionIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public SubscriptionIdParams build() {
-        return new SubscriptionIdParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerIdParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerIdParams(CustomerIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerIdBuilder builder() {
-      return new CustomerIdBuilder();
-    }
-
-    public static final class CustomerIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerIdBuilder() {}
-
-      public CustomerIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CustomerIdParams build() {
-        return new CustomerIdParams(this);
-      }
-    }
-  }
-
-  public static final class StatusParams {
-
-    private final Map<String, Object> formData;
-
-    private StatusParams(StatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatusBuilder builder() {
-      return new StatusBuilder();
-    }
-
-    public static final class StatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatusBuilder() {}
-
-      public StatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public StatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public StatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public StatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public StatusParams build() {
-        return new StatusParams(this);
-      }
-    }
-
-    public enum Is {
-      NEW("new"),
-
-      PROCESSING("processing"),
-
-      COMPLETE("complete"),
-
-      CANCELLED("cancelled"),
-
-      VOIDED("voided"),
-
-      QUEUED("queued"),
-
-      AWAITING_SHIPMENT("awaiting_shipment"),
-
-      ON_HOLD("on_hold"),
-
-      DELIVERED("delivered"),
-
-      SHIPPED("shipped"),
-
-      PARTIALLY_DELIVERED("partially_delivered"),
-
-      RETURNED("returned"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      NEW("new"),
-
-      PROCESSING("processing"),
-
-      COMPLETE("complete"),
-
-      CANCELLED("cancelled"),
-
-      VOIDED("voided"),
-
-      QUEUED("queued"),
-
-      AWAITING_SHIPMENT("awaiting_shipment"),
-
-      ON_HOLD("on_hold"),
-
-      DELIVERED("delivered"),
-
-      SHIPPED("shipped"),
-
-      PARTIALLY_DELIVERED("partially_delivered"),
-
-      RETURNED("returned"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PriceTypeParams {
-
-    private final Map<String, Object> formData;
-
-    private PriceTypeParams(PriceTypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PriceTypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PriceTypeBuilder builder() {
-      return new PriceTypeBuilder();
-    }
-
-    public static final class PriceTypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PriceTypeBuilder() {}
-
-      public PriceTypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PriceTypeParams build() {
-        return new PriceTypeParams(this);
-      }
-    }
-
-    public enum Is {
-      TAX_EXCLUSIVE("tax_exclusive"),
-
-      TAX_INCLUSIVE("tax_inclusive"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      TAX_EXCLUSIVE("tax_exclusive"),
-
-      TAX_INCLUSIVE("tax_inclusive"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class OrderDateParams {
-
-    private final Map<String, Object> formData;
-
-    private OrderDateParams(OrderDateBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for OrderDateParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static OrderDateBuilder builder() {
-      return new OrderDateBuilder();
-    }
-
-    public static final class OrderDateBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private OrderDateBuilder() {}
-
-      public OrderDateBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public OrderDateBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public OrderDateBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public OrderDateBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public OrderDateParams build() {
-        return new OrderDateParams(this);
-      }
-    }
-  }
-
-  public static final class ShippingDateParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingDateParams(ShippingDateBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingDateParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingDateBuilder builder() {
-      return new ShippingDateBuilder();
-    }
-
-    public static final class ShippingDateBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingDateBuilder() {}
-
-      public ShippingDateBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public ShippingDateBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public ShippingDateBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public ShippingDateBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public ShippingDateParams build() {
-        return new ShippingDateParams(this);
-      }
-    }
-  }
-
-  public static final class ShippedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippedAtParams(ShippedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippedAtBuilder builder() {
-      return new ShippedAtBuilder();
-    }
-
-    public static final class ShippedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippedAtBuilder() {}
-
-      public ShippedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public ShippedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public ShippedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public ShippedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public ShippedAtParams build() {
-        return new ShippedAtParams(this);
-      }
-    }
-  }
-
-  public static final class DeliveredAtParams {
-
-    private final Map<String, Object> formData;
-
-    private DeliveredAtParams(DeliveredAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DeliveredAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DeliveredAtBuilder builder() {
-      return new DeliveredAtBuilder();
-    }
-
-    public static final class DeliveredAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DeliveredAtBuilder() {}
-
-      public DeliveredAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public DeliveredAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public DeliveredAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public DeliveredAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public DeliveredAtParams build() {
-        return new DeliveredAtParams(this);
-      }
-    }
-  }
-
-  public static final class CancelledAtParams {
-
-    private final Map<String, Object> formData;
-
-    private CancelledAtParams(CancelledAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CancelledAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CancelledAtBuilder builder() {
-      return new CancelledAtBuilder();
-    }
-
-    public static final class CancelledAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CancelledAtBuilder() {}
-
-      public CancelledAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public CancelledAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public CancelledAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public CancelledAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public CancelledAtParams build() {
-        return new CancelledAtParams(this);
-      }
-    }
-  }
-
-  public static final class AmountPaidParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountPaidParams(AmountPaidBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountPaidParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountPaidBuilder builder() {
-      return new AmountPaidBuilder();
-    }
-
-    public static final class AmountPaidBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountPaidBuilder() {}
-
-      public AmountPaidBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountPaidParams build() {
-        return new AmountPaidParams(this);
-      }
-    }
-  }
-
-  public static final class RefundableCreditsParams {
-
-    private final Map<String, Object> formData;
-
-    private RefundableCreditsParams(RefundableCreditsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for RefundableCreditsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static RefundableCreditsBuilder builder() {
-      return new RefundableCreditsBuilder();
-    }
-
-    public static final class RefundableCreditsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private RefundableCreditsBuilder() {}
-
-      public RefundableCreditsBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public RefundableCreditsBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public RefundableCreditsBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public RefundableCreditsBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public RefundableCreditsBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public RefundableCreditsBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public RefundableCreditsBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public RefundableCreditsParams build() {
-        return new RefundableCreditsParams(this);
-      }
-    }
-  }
-
-  public static final class RefundableCreditsIssuedParams {
-
-    private final Map<String, Object> formData;
-
-    private RefundableCreditsIssuedParams(RefundableCreditsIssuedBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for RefundableCreditsIssuedParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static RefundableCreditsIssuedBuilder builder() {
-      return new RefundableCreditsIssuedBuilder();
-    }
-
-    public static final class RefundableCreditsIssuedBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private RefundableCreditsIssuedBuilder() {}
-
-      public RefundableCreditsIssuedBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public RefundableCreditsIssuedBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public RefundableCreditsIssuedBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public RefundableCreditsIssuedBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public RefundableCreditsIssuedBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public RefundableCreditsIssuedBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public RefundableCreditsIssuedBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public RefundableCreditsIssuedParams build() {
-        return new RefundableCreditsIssuedParams(this);
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class ResentStatusParams {
-
-    private final Map<String, Object> formData;
-
-    private ResentStatusParams(ResentStatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ResentStatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ResentStatusBuilder builder() {
-      return new ResentStatusBuilder();
-    }
-
-    public static final class ResentStatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ResentStatusBuilder() {}
-
-      public ResentStatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ResentStatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ResentStatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ResentStatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ResentStatusParams build() {
-        return new ResentStatusParams(this);
-      }
-    }
-
-    public enum Is {
-      FULLY_RESENT("fully_resent"),
-
-      PARTIALLY_RESENT("partially_resent"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      FULLY_RESENT("fully_resent"),
-
-      PARTIALLY_RESENT("partially_resent"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class IsResentParams {
-
-    private final Map<String, Object> formData;
-
-    private IsResentParams(IsResentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IsResentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IsResentBuilder builder() {
-      return new IsResentBuilder();
-    }
-
-    public static final class IsResentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IsResentBuilder() {}
-
-      public IsResentBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IsResentParams build() {
-        return new IsResentParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class OriginalOrderIdParams {
-
-    private final Map<String, Object> formData;
-
-    private OriginalOrderIdParams(OriginalOrderIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for OriginalOrderIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static OriginalOrderIdBuilder builder() {
-      return new OriginalOrderIdBuilder();
-    }
-
-    public static final class OriginalOrderIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private OriginalOrderIdBuilder() {}
-
-      public OriginalOrderIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public OriginalOrderIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public OriginalOrderIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public OriginalOrderIdParams build() {
-        return new OriginalOrderIdParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportPlansParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportPlansParams.java
deleted file mode 100644
index c0c12c47..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportPlansParams.java
+++ /dev/null
@@ -1,1403 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportPlansParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportPlansParams(ExportPlansBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportPlansParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportPlansBuilder builder() {
-    return new ExportPlansBuilder();
-  }
-
-  public static final class ExportPlansBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportPlansBuilder() {}
-
-    public ExportPlansBuilder currencyCode(CurrencyCodeParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "currency_code[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportPlansBuilder plan(PlanParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "plan[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportPlansParams build() {
-      return new ExportPlansParams(this);
-    }
-  }
-
-  public static final class CurrencyCodeParams {
-
-    private final Map<String, Object> formData;
-
-    private CurrencyCodeParams(CurrencyCodeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CurrencyCodeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CurrencyCodeBuilder builder() {
-      return new CurrencyCodeBuilder();
-    }
-
-    public static final class CurrencyCodeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CurrencyCodeBuilder() {}
-
-      public CurrencyCodeBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CurrencyCodeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CurrencyCodeParams build() {
-        return new CurrencyCodeParams(this);
-      }
-    }
-  }
-
-  public static final class PlanParams {
-
-    private final Map<String, Object> formData;
-
-    private PlanParams(PlanBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PlanParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PlanBuilder builder() {
-      return new PlanBuilder();
-    }
-
-    public static final class PlanBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PlanBuilder() {}
-
-      public PlanBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PlanBuilder name(NameParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "name[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PlanBuilder price(PriceParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "price[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PlanBuilder period(PeriodParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "period[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PlanBuilder periodUnit(PeriodUnitParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "period_unit[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PlanBuilder trialPeriod(TrialPeriodParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "trial_period[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PlanBuilder trialPeriodUnit(TrialPeriodUnitParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "trial_period_unit[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PlanBuilder addonApplicability(AddonApplicabilityParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "addon_applicability[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PlanBuilder giftable(GiftableParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "giftable[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PlanBuilder status(StatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PlanBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PlanBuilder channel(ChannelParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PlanParams build() {
-        return new PlanParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class NameParams {
-
-    private final Map<String, Object> formData;
-
-    private NameParams(NameBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NameParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NameBuilder builder() {
-      return new NameBuilder();
-    }
-
-    public static final class NameBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NameBuilder() {}
-
-      public NameBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public NameBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public NameBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public NameBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public NameBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public NameParams build() {
-        return new NameParams(this);
-      }
-    }
-  }
-
-  public static final class PriceParams {
-
-    private final Map<String, Object> formData;
-
-    private PriceParams(PriceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PriceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PriceBuilder builder() {
-      return new PriceBuilder();
-    }
-
-    public static final class PriceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PriceBuilder() {}
-
-      public PriceBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PriceBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PriceBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public PriceBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public PriceBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public PriceBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public PriceBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public PriceParams build() {
-        return new PriceParams(this);
-      }
-    }
-  }
-
-  public static final class PeriodParams {
-
-    private final Map<String, Object> formData;
-
-    private PeriodParams(PeriodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PeriodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PeriodBuilder builder() {
-      return new PeriodBuilder();
-    }
-
-    public static final class PeriodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PeriodBuilder() {}
-
-      public PeriodBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PeriodBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PeriodBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public PeriodBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public PeriodBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public PeriodBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public PeriodBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public PeriodParams build() {
-        return new PeriodParams(this);
-      }
-    }
-  }
-
-  public static final class PeriodUnitParams {
-
-    private final Map<String, Object> formData;
-
-    private PeriodUnitParams(PeriodUnitBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PeriodUnitParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PeriodUnitBuilder builder() {
-      return new PeriodUnitBuilder();
-    }
-
-    public static final class PeriodUnitBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PeriodUnitBuilder() {}
-
-      public PeriodUnitBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PeriodUnitBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PeriodUnitBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PeriodUnitBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PeriodUnitParams build() {
-        return new PeriodUnitParams(this);
-      }
-    }
-
-    public enum Is {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TrialPeriodParams {
-
-    private final Map<String, Object> formData;
-
-    private TrialPeriodParams(TrialPeriodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TrialPeriodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TrialPeriodBuilder builder() {
-      return new TrialPeriodBuilder();
-    }
-
-    public static final class TrialPeriodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TrialPeriodBuilder() {}
-
-      public TrialPeriodBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TrialPeriodBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TrialPeriodBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public TrialPeriodBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public TrialPeriodBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public TrialPeriodBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public TrialPeriodBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public TrialPeriodBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public TrialPeriodParams build() {
-        return new TrialPeriodParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TrialPeriodUnitParams {
-
-    private final Map<String, Object> formData;
-
-    private TrialPeriodUnitParams(TrialPeriodUnitBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TrialPeriodUnitParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TrialPeriodUnitBuilder builder() {
-      return new TrialPeriodUnitBuilder();
-    }
-
-    public static final class TrialPeriodUnitBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TrialPeriodUnitBuilder() {}
-
-      public TrialPeriodUnitBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TrialPeriodUnitBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TrialPeriodUnitBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public TrialPeriodUnitBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public TrialPeriodUnitParams build() {
-        return new TrialPeriodUnitParams(this);
-      }
-    }
-
-    public enum Is {
-      DAY("day"),
-
-      MONTH("month"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      DAY("day"),
-
-      MONTH("month"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonApplicabilityParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonApplicabilityParams(AddonApplicabilityBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonApplicabilityParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonApplicabilityBuilder builder() {
-      return new AddonApplicabilityBuilder();
-    }
-
-    public static final class AddonApplicabilityBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonApplicabilityBuilder() {}
-
-      public AddonApplicabilityBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AddonApplicabilityBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AddonApplicabilityBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public AddonApplicabilityBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public AddonApplicabilityParams build() {
-        return new AddonApplicabilityParams(this);
-      }
-    }
-
-    public enum Is {
-      ALL("all"),
-
-      RESTRICTED("restricted"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ALL("all"),
-
-      RESTRICTED("restricted"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class GiftableParams {
-
-    private final Map<String, Object> formData;
-
-    private GiftableParams(GiftableBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GiftableParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GiftableBuilder builder() {
-      return new GiftableBuilder();
-    }
-
-    public static final class GiftableBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GiftableBuilder() {}
-
-      public GiftableBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public GiftableParams build() {
-        return new GiftableParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatusParams {
-
-    private final Map<String, Object> formData;
-
-    private StatusParams(StatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatusBuilder builder() {
-      return new StatusBuilder();
-    }
-
-    public static final class StatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatusBuilder() {}
-
-      public StatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public StatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public StatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public StatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public StatusParams build() {
-        return new StatusParams(this);
-      }
-    }
-
-    public enum Is {
-      ACTIVE("active"),
-
-      ARCHIVED("archived"),
-
-      DELETED("deleted"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ACTIVE("active"),
-
-      ARCHIVED("archived"),
-
-      DELETED("deleted"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class ChannelParams {
-
-    private final Map<String, Object> formData;
-
-    private ChannelParams(ChannelBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChannelParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChannelBuilder builder() {
-      return new ChannelBuilder();
-    }
-
-    public static final class ChannelBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChannelBuilder() {}
-
-      public ChannelBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ChannelBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ChannelBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ChannelBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ChannelParams build() {
-        return new ChannelParams(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportPriceVariantsParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportPriceVariantsParams.java
deleted file mode 100644
index 7b6893c3..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportPriceVariantsParams.java
+++ /dev/null
@@ -1,659 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportPriceVariantsParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportPriceVariantsParams(ExportPriceVariantsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportPriceVariantsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportPriceVariantsBuilder builder() {
-    return new ExportPriceVariantsBuilder();
-  }
-
-  public static final class ExportPriceVariantsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportPriceVariantsBuilder() {}
-
-    public ExportPriceVariantsBuilder businessEntityId(BusinessEntityIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "business_entity_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportPriceVariantsBuilder includeSiteLevelResources(
-        IncludeSiteLevelResourcesParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "include_site_level_resources[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportPriceVariantsBuilder priceVariant(PriceVariantParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "price_variant[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportPriceVariantsParams build() {
-      return new ExportPriceVariantsParams(this);
-    }
-  }
-
-  public static final class BusinessEntityIdParams {
-
-    private final Map<String, Object> formData;
-
-    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BusinessEntityIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BusinessEntityIdBuilder builder() {
-      return new BusinessEntityIdBuilder();
-    }
-
-    public static final class BusinessEntityIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BusinessEntityIdBuilder() {}
-
-      public BusinessEntityIdBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdParams build() {
-        return new BusinessEntityIdParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class IncludeSiteLevelResourcesParams {
-
-    private final Map<String, Object> formData;
-
-    private IncludeSiteLevelResourcesParams(IncludeSiteLevelResourcesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IncludeSiteLevelResourcesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IncludeSiteLevelResourcesBuilder builder() {
-      return new IncludeSiteLevelResourcesBuilder();
-    }
-
-    public static final class IncludeSiteLevelResourcesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IncludeSiteLevelResourcesBuilder() {}
-
-      public IncludeSiteLevelResourcesBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IncludeSiteLevelResourcesParams build() {
-        return new IncludeSiteLevelResourcesParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PriceVariantParams {
-
-    private final Map<String, Object> formData;
-
-    private PriceVariantParams(PriceVariantBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PriceVariantParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PriceVariantBuilder builder() {
-      return new PriceVariantBuilder();
-    }
-
-    public static final class PriceVariantBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PriceVariantBuilder() {}
-
-      public PriceVariantBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PriceVariantBuilder name(NameParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "name[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PriceVariantBuilder status(StatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PriceVariantBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PriceVariantBuilder createdAt(CreatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "created_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public PriceVariantParams build() {
-        return new PriceVariantParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class NameParams {
-
-    private final Map<String, Object> formData;
-
-    private NameParams(NameBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NameParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NameBuilder builder() {
-      return new NameBuilder();
-    }
-
-    public static final class NameBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NameBuilder() {}
-
-      public NameBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public NameBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public NameBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public NameBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public NameBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public NameParams build() {
-        return new NameParams(this);
-      }
-    }
-  }
-
-  public static final class StatusParams {
-
-    private final Map<String, Object> formData;
-
-    private StatusParams(StatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatusBuilder builder() {
-      return new StatusBuilder();
-    }
-
-    public static final class StatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatusBuilder() {}
-
-      public StatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public StatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public StatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public StatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public StatusParams build() {
-        return new StatusParams(this);
-      }
-    }
-
-    public enum Is {
-      ACTIVE("active"),
-
-      ARCHIVED("archived"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ACTIVE("active"),
-
-      ARCHIVED("archived"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class CreatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private CreatedAtParams(CreatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreatedAtBuilder builder() {
-      return new CreatedAtBuilder();
-    }
-
-    public static final class CreatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreatedAtBuilder() {}
-
-      public CreatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public CreatedAtParams build() {
-        return new CreatedAtParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportRevenueRecognitionParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportRevenueRecognitionParams.java
deleted file mode 100644
index 0e3b2c97..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportRevenueRecognitionParams.java
+++ /dev/null
@@ -1,5043 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportRevenueRecognitionParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportRevenueRecognitionParams(ExportRevenueRecognitionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportRevenueRecognitionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportRevenueRecognitionBuilder builder() {
-    return new ExportRevenueRecognitionBuilder();
-  }
-
-  public static final class ExportRevenueRecognitionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportRevenueRecognitionBuilder() {}
-
-    public ExportRevenueRecognitionBuilder reportBy(ReportBy value) {
-
-      formData.put("report_by", value);
-
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder reportFromMonth(Integer value) {
-
-      formData.put("report_from_month", value);
-
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder reportFromYear(Integer value) {
-
-      formData.put("report_from_year", value);
-
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder reportToMonth(Integer value) {
-
-      formData.put("report_to_month", value);
-
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder reportToYear(Integer value) {
-
-      formData.put("report_to_year", value);
-
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder includeDiscounts(Boolean value) {
-
-      formData.put("include_discounts", value);
-
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder paymentOwner(PaymentOwnerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_owner[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder itemId(ItemIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder itemPriceId(ItemPriceIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_price_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder cancelReasonCode(CancelReasonCodeParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "cancel_reason_code[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder businessEntityId(BusinessEntityIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "business_entity_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder invoice(InvoiceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "invoice[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportRevenueRecognitionBuilder relationship(RelationshipParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "relationship[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportRevenueRecognitionParams build() {
-      return new ExportRevenueRecognitionParams(this);
-    }
-  }
-
-  public enum ReportBy {
-    CUSTOMER("customer"),
-
-    INVOICE("invoice"),
-
-    PRODUCT("product"),
-
-    SUBSCRIPTION("subscription"),
-
-    /** An enum member indicating that ReportBy was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ReportBy(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ReportBy fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ReportBy enumValue : ReportBy.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class PaymentOwnerParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentOwnerParams(PaymentOwnerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentOwnerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentOwnerBuilder builder() {
-      return new PaymentOwnerBuilder();
-    }
-
-    public static final class PaymentOwnerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentOwnerBuilder() {}
-
-      public PaymentOwnerBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PaymentOwnerBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PaymentOwnerBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PaymentOwnerBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PaymentOwnerBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PaymentOwnerParams build() {
-        return new PaymentOwnerParams(this);
-      }
-    }
-  }
-
-  public static final class ItemIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemIdParams(ItemIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemIdBuilder builder() {
-      return new ItemIdBuilder();
-    }
-
-    public static final class ItemIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemIdBuilder() {}
-
-      public ItemIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemIdParams build() {
-        return new ItemIdParams(this);
-      }
-    }
-  }
-
-  public static final class ItemPriceIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemPriceIdParams(ItemPriceIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemPriceIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemPriceIdBuilder builder() {
-      return new ItemPriceIdBuilder();
-    }
-
-    public static final class ItemPriceIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemPriceIdBuilder() {}
-
-      public ItemPriceIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemPriceIdParams build() {
-        return new ItemPriceIdParams(this);
-      }
-    }
-  }
-
-  public static final class CancelReasonCodeParams {
-
-    private final Map<String, Object> formData;
-
-    private CancelReasonCodeParams(CancelReasonCodeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CancelReasonCodeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CancelReasonCodeBuilder builder() {
-      return new CancelReasonCodeBuilder();
-    }
-
-    public static final class CancelReasonCodeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CancelReasonCodeBuilder() {}
-
-      public CancelReasonCodeBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeParams build() {
-        return new CancelReasonCodeParams(this);
-      }
-    }
-  }
-
-  public static final class BusinessEntityIdParams {
-
-    private final Map<String, Object> formData;
-
-    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BusinessEntityIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BusinessEntityIdBuilder builder() {
-      return new BusinessEntityIdBuilder();
-    }
-
-    public static final class BusinessEntityIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BusinessEntityIdBuilder() {}
-
-      public BusinessEntityIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public BusinessEntityIdParams build() {
-        return new BusinessEntityIdParams(this);
-      }
-    }
-  }
-
-  public static final class InvoiceParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceParams(InvoiceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceBuilder builder() {
-      return new InvoiceBuilder();
-    }
-
-    public static final class InvoiceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceBuilder() {}
-
-      public InvoiceBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder recurring(RecurringParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "recurring[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder status(StatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder priceType(PriceTypeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "price_type[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder date(DateParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "date[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder paidAt(PaidAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "paid_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder total(TotalParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "total[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder amountPaid(AmountPaidParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_paid[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder amountAdjusted(AmountAdjustedParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_adjusted[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder creditsApplied(CreditsAppliedParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "credits_applied[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder amountDue(AmountDueParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_due[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder dunningStatus(DunningStatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "dunning_status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceBuilder channel(ChannelParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public InvoiceParams build() {
-        return new InvoiceParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class RecurringParams {
-
-    private final Map<String, Object> formData;
-
-    private RecurringParams(RecurringBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for RecurringParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static RecurringBuilder builder() {
-      return new RecurringBuilder();
-    }
-
-    public static final class RecurringBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private RecurringBuilder() {}
-
-      public RecurringBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public RecurringParams build() {
-        return new RecurringParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatusParams {
-
-    private final Map<String, Object> formData;
-
-    private StatusParams(StatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatusBuilder builder() {
-      return new StatusBuilder();
-    }
-
-    public static final class StatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatusBuilder() {}
-
-      public StatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public StatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public StatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public StatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public StatusParams build() {
-        return new StatusParams(this);
-      }
-    }
-
-    public enum Is {
-      PAID("paid"),
-
-      POSTED("posted"),
-
-      PAYMENT_DUE("payment_due"),
-
-      NOT_PAID("not_paid"),
-
-      VOIDED("voided"),
-
-      PENDING("pending"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      PAID("paid"),
-
-      POSTED("posted"),
-
-      PAYMENT_DUE("payment_due"),
-
-      NOT_PAID("not_paid"),
-
-      VOIDED("voided"),
-
-      PENDING("pending"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PriceTypeParams {
-
-    private final Map<String, Object> formData;
-
-    private PriceTypeParams(PriceTypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PriceTypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PriceTypeBuilder builder() {
-      return new PriceTypeBuilder();
-    }
-
-    public static final class PriceTypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PriceTypeBuilder() {}
-
-      public PriceTypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PriceTypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PriceTypeParams build() {
-        return new PriceTypeParams(this);
-      }
-    }
-
-    public enum Is {
-      TAX_EXCLUSIVE("tax_exclusive"),
-
-      TAX_INCLUSIVE("tax_inclusive"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      TAX_EXCLUSIVE("tax_exclusive"),
-
-      TAX_INCLUSIVE("tax_inclusive"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DateParams {
-
-    private final Map<String, Object> formData;
-
-    private DateParams(DateBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DateParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DateBuilder builder() {
-      return new DateBuilder();
-    }
-
-    public static final class DateBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DateBuilder() {}
-
-      public DateBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public DateBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public DateBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public DateBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public DateParams build() {
-        return new DateParams(this);
-      }
-    }
-  }
-
-  public static final class PaidAtParams {
-
-    private final Map<String, Object> formData;
-
-    private PaidAtParams(PaidAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaidAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaidAtBuilder builder() {
-      return new PaidAtBuilder();
-    }
-
-    public static final class PaidAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaidAtBuilder() {}
-
-      public PaidAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public PaidAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public PaidAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public PaidAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public PaidAtParams build() {
-        return new PaidAtParams(this);
-      }
-    }
-  }
-
-  public static final class TotalParams {
-
-    private final Map<String, Object> formData;
-
-    private TotalParams(TotalBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TotalParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TotalBuilder builder() {
-      return new TotalBuilder();
-    }
-
-    public static final class TotalBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TotalBuilder() {}
-
-      public TotalBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TotalBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TotalBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public TotalBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public TotalBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public TotalBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public TotalBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public TotalParams build() {
-        return new TotalParams(this);
-      }
-    }
-  }
-
-  public static final class AmountPaidParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountPaidParams(AmountPaidBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountPaidParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountPaidBuilder builder() {
-      return new AmountPaidBuilder();
-    }
-
-    public static final class AmountPaidBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountPaidBuilder() {}
-
-      public AmountPaidBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountPaidBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountPaidParams build() {
-        return new AmountPaidParams(this);
-      }
-    }
-  }
-
-  public static final class AmountAdjustedParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountAdjustedParams(AmountAdjustedBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountAdjustedParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountAdjustedBuilder builder() {
-      return new AmountAdjustedBuilder();
-    }
-
-    public static final class AmountAdjustedBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountAdjustedBuilder() {}
-
-      public AmountAdjustedBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountAdjustedBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountAdjustedParams build() {
-        return new AmountAdjustedParams(this);
-      }
-    }
-  }
-
-  public static final class CreditsAppliedParams {
-
-    private final Map<String, Object> formData;
-
-    private CreditsAppliedParams(CreditsAppliedBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreditsAppliedParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreditsAppliedBuilder builder() {
-      return new CreditsAppliedBuilder();
-    }
-
-    public static final class CreditsAppliedBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreditsAppliedBuilder() {}
-
-      public CreditsAppliedBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public CreditsAppliedBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public CreditsAppliedParams build() {
-        return new CreditsAppliedParams(this);
-      }
-    }
-  }
-
-  public static final class AmountDueParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountDueParams(AmountDueBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountDueParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountDueBuilder builder() {
-      return new AmountDueBuilder();
-    }
-
-    public static final class AmountDueBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountDueBuilder() {}
-
-      public AmountDueBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountDueBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountDueParams build() {
-        return new AmountDueParams(this);
-      }
-    }
-  }
-
-  public static final class DunningStatusParams {
-
-    private final Map<String, Object> formData;
-
-    private DunningStatusParams(DunningStatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DunningStatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DunningStatusBuilder builder() {
-      return new DunningStatusBuilder();
-    }
-
-    public static final class DunningStatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DunningStatusBuilder() {}
-
-      public DunningStatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public DunningStatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public DunningStatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public DunningStatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public DunningStatusBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public DunningStatusParams build() {
-        return new DunningStatusParams(this);
-      }
-    }
-
-    public enum Is {
-      IN_PROGRESS("in_progress"),
-
-      EXHAUSTED("exhausted"),
-
-      STOPPED("stopped"),
-
-      SUCCESS("success"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      IN_PROGRESS("in_progress"),
-
-      EXHAUSTED("exhausted"),
-
-      STOPPED("stopped"),
-
-      SUCCESS("success"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class ChannelParams {
-
-    private final Map<String, Object> formData;
-
-    private ChannelParams(ChannelBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChannelParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChannelBuilder builder() {
-      return new ChannelBuilder();
-    }
-
-    public static final class ChannelBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChannelBuilder() {}
-
-      public ChannelBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ChannelBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ChannelBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ChannelBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ChannelParams build() {
-        return new ChannelParams(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(ExportIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder customerId(CustomerIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "customer_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder status(ExportStatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder cancelReason(CancelReasonParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "cancel_reason[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder remainingBillingCycles(RemainingBillingCyclesParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "remaining_billing_cycles[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder createdAt(CreatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "created_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder activatedAt(ActivatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "activated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder nextBillingAt(NextBillingAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "next_billing_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder cancelledAt(CancelledAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "cancelled_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder hasScheduledChanges(HasScheduledChangesParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "has_scheduled_changes[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder updatedAt(ExportUpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethodParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "offline_payment_method[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder autoCloseInvoices(AutoCloseInvoicesParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "auto_close_invoices[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder channel(ExportChannelParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder planId(PlanIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "plan_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-  }
-
-  public static final class ExportIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportIdParams(ExportIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportIdBuilder builder() {
-      return new ExportIdBuilder();
-    }
-
-    public static final class ExportIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportIdBuilder() {}
-
-      public ExportIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ExportIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ExportIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ExportIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ExportIdParams build() {
-        return new ExportIdParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerIdParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerIdParams(CustomerIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerIdBuilder builder() {
-      return new CustomerIdBuilder();
-    }
-
-    public static final class CustomerIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerIdBuilder() {}
-
-      public CustomerIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CustomerIdParams build() {
-        return new CustomerIdParams(this);
-      }
-    }
-  }
-
-  public static final class ExportStatusParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportStatusParams(ExportStatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportStatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportStatusBuilder builder() {
-      return new ExportStatusBuilder();
-    }
-
-    public static final class ExportStatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportStatusBuilder() {}
-
-      public ExportStatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportStatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ExportStatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ExportStatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ExportStatusParams build() {
-        return new ExportStatusParams(this);
-      }
-    }
-
-    public enum Is {
-      FUTURE("future"),
-
-      IN_TRIAL("in_trial"),
-
-      ACTIVE("active"),
-
-      NON_RENEWING("non_renewing"),
-
-      PAUSED("paused"),
-
-      CANCELLED("cancelled"),
-
-      TRANSFERRED("transferred"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      FUTURE("future"),
-
-      IN_TRIAL("in_trial"),
-
-      ACTIVE("active"),
-
-      NON_RENEWING("non_renewing"),
-
-      PAUSED("paused"),
-
-      CANCELLED("cancelled"),
-
-      TRANSFERRED("transferred"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CancelReasonParams {
-
-    private final Map<String, Object> formData;
-
-    private CancelReasonParams(CancelReasonBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CancelReasonParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CancelReasonBuilder builder() {
-      return new CancelReasonBuilder();
-    }
-
-    public static final class CancelReasonBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CancelReasonBuilder() {}
-
-      public CancelReasonBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CancelReasonBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CancelReasonBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CancelReasonBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CancelReasonBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public CancelReasonParams build() {
-        return new CancelReasonParams(this);
-      }
-    }
-
-    public enum Is {
-      NOT_PAID("not_paid"),
-
-      NO_CARD("no_card"),
-
-      FRAUD_REVIEW_FAILED("fraud_review_failed"),
-
-      NON_COMPLIANT_EU_CUSTOMER("non_compliant_eu_customer"),
-
-      TAX_CALCULATION_FAILED("tax_calculation_failed"),
-
-      CURRENCY_INCOMPATIBLE_WITH_GATEWAY("currency_incompatible_with_gateway"),
-
-      NON_COMPLIANT_CUSTOMER("non_compliant_customer"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      NOT_PAID("not_paid"),
-
-      NO_CARD("no_card"),
-
-      FRAUD_REVIEW_FAILED("fraud_review_failed"),
-
-      NON_COMPLIANT_EU_CUSTOMER("non_compliant_eu_customer"),
-
-      TAX_CALCULATION_FAILED("tax_calculation_failed"),
-
-      CURRENCY_INCOMPATIBLE_WITH_GATEWAY("currency_incompatible_with_gateway"),
-
-      NON_COMPLIANT_CUSTOMER("non_compliant_customer"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class RemainingBillingCyclesParams {
-
-    private final Map<String, Object> formData;
-
-    private RemainingBillingCyclesParams(RemainingBillingCyclesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for RemainingBillingCyclesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static RemainingBillingCyclesBuilder builder() {
-      return new RemainingBillingCyclesBuilder();
-    }
-
-    public static final class RemainingBillingCyclesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private RemainingBillingCyclesBuilder() {}
-
-      public RemainingBillingCyclesBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesParams build() {
-        return new RemainingBillingCyclesParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CreatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private CreatedAtParams(CreatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreatedAtBuilder builder() {
-      return new CreatedAtBuilder();
-    }
-
-    public static final class CreatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreatedAtBuilder() {}
-
-      public CreatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public CreatedAtParams build() {
-        return new CreatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class ActivatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private ActivatedAtParams(ActivatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ActivatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ActivatedAtBuilder builder() {
-      return new ActivatedAtBuilder();
-    }
-
-    public static final class ActivatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ActivatedAtBuilder() {}
-
-      public ActivatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public ActivatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public ActivatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public ActivatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public ActivatedAtBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public ActivatedAtParams build() {
-        return new ActivatedAtParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class NextBillingAtParams {
-
-    private final Map<String, Object> formData;
-
-    private NextBillingAtParams(NextBillingAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NextBillingAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NextBillingAtBuilder builder() {
-      return new NextBillingAtBuilder();
-    }
-
-    public static final class NextBillingAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NextBillingAtBuilder() {}
-
-      public NextBillingAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public NextBillingAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public NextBillingAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public NextBillingAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public NextBillingAtParams build() {
-        return new NextBillingAtParams(this);
-      }
-    }
-  }
-
-  public static final class CancelledAtParams {
-
-    private final Map<String, Object> formData;
-
-    private CancelledAtParams(CancelledAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CancelledAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CancelledAtBuilder builder() {
-      return new CancelledAtBuilder();
-    }
-
-    public static final class CancelledAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CancelledAtBuilder() {}
-
-      public CancelledAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public CancelledAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public CancelledAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public CancelledAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public CancelledAtParams build() {
-        return new CancelledAtParams(this);
-      }
-    }
-  }
-
-  public static final class HasScheduledChangesParams {
-
-    private final Map<String, Object> formData;
-
-    private HasScheduledChangesParams(HasScheduledChangesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for HasScheduledChangesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static HasScheduledChangesBuilder builder() {
-      return new HasScheduledChangesBuilder();
-    }
-
-    public static final class HasScheduledChangesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private HasScheduledChangesBuilder() {}
-
-      public HasScheduledChangesBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public HasScheduledChangesParams build() {
-        return new HasScheduledChangesParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ExportUpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportUpdatedAtParams(ExportUpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportUpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportUpdatedAtBuilder builder() {
-      return new ExportUpdatedAtBuilder();
-    }
-
-    public static final class ExportUpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportUpdatedAtBuilder() {}
-
-      public ExportUpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAtParams build() {
-        return new ExportUpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class OfflinePaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private OfflinePaymentMethodParams(OfflinePaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for OfflinePaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static OfflinePaymentMethodBuilder builder() {
-      return new OfflinePaymentMethodBuilder();
-    }
-
-    public static final class OfflinePaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private OfflinePaymentMethodBuilder() {}
-
-      public OfflinePaymentMethodBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodParams build() {
-        return new OfflinePaymentMethodParams(this);
-      }
-    }
-
-    public enum Is {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AutoCloseInvoicesParams {
-
-    private final Map<String, Object> formData;
-
-    private AutoCloseInvoicesParams(AutoCloseInvoicesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AutoCloseInvoicesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AutoCloseInvoicesBuilder builder() {
-      return new AutoCloseInvoicesBuilder();
-    }
-
-    public static final class AutoCloseInvoicesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AutoCloseInvoicesBuilder() {}
-
-      public AutoCloseInvoicesBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AutoCloseInvoicesParams build() {
-        return new AutoCloseInvoicesParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ExportChannelParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportChannelParams(ExportChannelBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportChannelParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportChannelBuilder builder() {
-      return new ExportChannelBuilder();
-    }
-
-    public static final class ExportChannelBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportChannelBuilder() {}
-
-      public ExportChannelBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportChannelBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ExportChannelBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ExportChannelBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ExportChannelParams build() {
-        return new ExportChannelParams(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PlanIdParams {
-
-    private final Map<String, Object> formData;
-
-    private PlanIdParams(PlanIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PlanIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PlanIdBuilder builder() {
-      return new PlanIdBuilder();
-    }
-
-    public static final class PlanIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PlanIdBuilder() {}
-
-      public PlanIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PlanIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PlanIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PlanIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PlanIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PlanIdParams build() {
-        return new PlanIdParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(ExportId2Params value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder firstName(FirstNameParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "first_name[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder lastName(LastNameParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "last_name[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder email(EmailParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "email[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder company(CompanyParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "company[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder phone(PhoneParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "phone[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder autoCollection(AutoCollectionParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "auto_collection[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder taxability(TaxabilityParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "taxability[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder createdAt(ExportCreatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "created_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder updatedAt(ExportUpdatedAt2Params value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder offlinePaymentMethod(ExportOfflinePaymentMethodParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "offline_payment_method[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder autoCloseInvoices(ExportAutoCloseInvoicesParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "auto_close_invoices[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerBuilder channel(ExportChannel2Params value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class ExportId2Params {
-
-    private final Map<String, Object> formData;
-
-    private ExportId2Params(ExportId2Builder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportId2Params. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportId2Builder builder() {
-      return new ExportId2Builder();
-    }
-
-    public static final class ExportId2Builder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportId2Builder() {}
-
-      public ExportId2Builder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportId2Builder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ExportId2Builder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ExportId2Builder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ExportId2Builder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ExportId2Params build() {
-        return new ExportId2Params(this);
-      }
-    }
-  }
-
-  public static final class FirstNameParams {
-
-    private final Map<String, Object> formData;
-
-    private FirstNameParams(FirstNameBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for FirstNameParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static FirstNameBuilder builder() {
-      return new FirstNameBuilder();
-    }
-
-    public static final class FirstNameBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private FirstNameBuilder() {}
-
-      public FirstNameBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public FirstNameBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public FirstNameBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public FirstNameBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public FirstNameParams build() {
-        return new FirstNameParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class LastNameParams {
-
-    private final Map<String, Object> formData;
-
-    private LastNameParams(LastNameBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LastNameParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LastNameBuilder builder() {
-      return new LastNameBuilder();
-    }
-
-    public static final class LastNameBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LastNameBuilder() {}
-
-      public LastNameBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public LastNameBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public LastNameBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public LastNameBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public LastNameParams build() {
-        return new LastNameParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class EmailParams {
-
-    private final Map<String, Object> formData;
-
-    private EmailParams(EmailBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EmailParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EmailBuilder builder() {
-      return new EmailBuilder();
-    }
-
-    public static final class EmailBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EmailBuilder() {}
-
-      public EmailBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public EmailBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public EmailBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public EmailBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public EmailParams build() {
-        return new EmailParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CompanyParams {
-
-    private final Map<String, Object> formData;
-
-    private CompanyParams(CompanyBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CompanyParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CompanyBuilder builder() {
-      return new CompanyBuilder();
-    }
-
-    public static final class CompanyBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CompanyBuilder() {}
-
-      public CompanyBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CompanyBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CompanyBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CompanyBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public CompanyParams build() {
-        return new CompanyParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PhoneParams {
-
-    private final Map<String, Object> formData;
-
-    private PhoneParams(PhoneBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PhoneParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PhoneBuilder builder() {
-      return new PhoneBuilder();
-    }
-
-    public static final class PhoneBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PhoneBuilder() {}
-
-      public PhoneBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PhoneBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PhoneBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PhoneBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public PhoneParams build() {
-        return new PhoneParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AutoCollectionParams {
-
-    private final Map<String, Object> formData;
-
-    private AutoCollectionParams(AutoCollectionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AutoCollectionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AutoCollectionBuilder builder() {
-      return new AutoCollectionBuilder();
-    }
-
-    public static final class AutoCollectionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AutoCollectionBuilder() {}
-
-      public AutoCollectionBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AutoCollectionBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AutoCollectionBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public AutoCollectionBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public AutoCollectionParams build() {
-        return new AutoCollectionParams(this);
-      }
-    }
-
-    public enum Is {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxabilityParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxabilityParams(TaxabilityBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxabilityParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxabilityBuilder builder() {
-      return new TaxabilityBuilder();
-    }
-
-    public static final class TaxabilityBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxabilityBuilder() {}
-
-      public TaxabilityBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TaxabilityBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TaxabilityBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public TaxabilityBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public TaxabilityParams build() {
-        return new TaxabilityParams(this);
-      }
-    }
-
-    public enum Is {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ExportCreatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportCreatedAtParams(ExportCreatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportCreatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportCreatedAtBuilder builder() {
-      return new ExportCreatedAtBuilder();
-    }
-
-    public static final class ExportCreatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportCreatedAtBuilder() {}
-
-      public ExportCreatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public ExportCreatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public ExportCreatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public ExportCreatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public ExportCreatedAtParams build() {
-        return new ExportCreatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class ExportUpdatedAt2Params {
-
-    private final Map<String, Object> formData;
-
-    private ExportUpdatedAt2Params(ExportUpdatedAt2Builder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportUpdatedAt2Params. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportUpdatedAt2Builder builder() {
-      return new ExportUpdatedAt2Builder();
-    }
-
-    public static final class ExportUpdatedAt2Builder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportUpdatedAt2Builder() {}
-
-      public ExportUpdatedAt2Builder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAt2Builder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAt2Builder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAt2Builder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public ExportUpdatedAt2Params build() {
-        return new ExportUpdatedAt2Params(this);
-      }
-    }
-  }
-
-  public static final class ExportOfflinePaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportOfflinePaymentMethodParams(ExportOfflinePaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportOfflinePaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportOfflinePaymentMethodBuilder builder() {
-      return new ExportOfflinePaymentMethodBuilder();
-    }
-
-    public static final class ExportOfflinePaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportOfflinePaymentMethodBuilder() {}
-
-      public ExportOfflinePaymentMethodBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportOfflinePaymentMethodBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ExportOfflinePaymentMethodBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ExportOfflinePaymentMethodBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ExportOfflinePaymentMethodParams build() {
-        return new ExportOfflinePaymentMethodParams(this);
-      }
-    }
-
-    public enum Is {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ExportAutoCloseInvoicesParams {
-
-    private final Map<String, Object> formData;
-
-    private ExportAutoCloseInvoicesParams(ExportAutoCloseInvoicesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportAutoCloseInvoicesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportAutoCloseInvoicesBuilder builder() {
-      return new ExportAutoCloseInvoicesBuilder();
-    }
-
-    public static final class ExportAutoCloseInvoicesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportAutoCloseInvoicesBuilder() {}
-
-      public ExportAutoCloseInvoicesBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportAutoCloseInvoicesParams build() {
-        return new ExportAutoCloseInvoicesParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ExportChannel2Params {
-
-    private final Map<String, Object> formData;
-
-    private ExportChannel2Params(ExportChannel2Builder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ExportChannel2Params. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ExportChannel2Builder builder() {
-      return new ExportChannel2Builder();
-    }
-
-    public static final class ExportChannel2Builder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ExportChannel2Builder() {}
-
-      public ExportChannel2Builder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ExportChannel2Builder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ExportChannel2Builder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ExportChannel2Builder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ExportChannel2Params build() {
-        return new ExportChannel2Params(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class RelationshipParams {
-
-    private final Map<String, Object> formData;
-
-    private RelationshipParams(RelationshipBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for RelationshipParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static RelationshipBuilder builder() {
-      return new RelationshipBuilder();
-    }
-
-    public static final class RelationshipBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private RelationshipBuilder() {}
-
-      public RelationshipBuilder parentId(ParentIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "parent_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public RelationshipBuilder paymentOwnerId(PaymentOwnerIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "payment_owner_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public RelationshipBuilder invoiceOwnerId(InvoiceOwnerIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "invoice_owner_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public RelationshipParams build() {
-        return new RelationshipParams(this);
-      }
-    }
-  }
-
-  public static final class ParentIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ParentIdParams(ParentIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ParentIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ParentIdBuilder builder() {
-      return new ParentIdBuilder();
-    }
-
-    public static final class ParentIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ParentIdBuilder() {}
-
-      public ParentIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ParentIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ParentIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ParentIdParams build() {
-        return new ParentIdParams(this);
-      }
-    }
-  }
-
-  public static final class PaymentOwnerIdParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentOwnerIdParams(PaymentOwnerIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentOwnerIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentOwnerIdBuilder builder() {
-      return new PaymentOwnerIdBuilder();
-    }
-
-    public static final class PaymentOwnerIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentOwnerIdBuilder() {}
-
-      public PaymentOwnerIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PaymentOwnerIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PaymentOwnerIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PaymentOwnerIdParams build() {
-        return new PaymentOwnerIdParams(this);
-      }
-    }
-  }
-
-  public static final class InvoiceOwnerIdParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceOwnerIdParams(InvoiceOwnerIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceOwnerIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceOwnerIdBuilder builder() {
-      return new InvoiceOwnerIdBuilder();
-    }
-
-    public static final class InvoiceOwnerIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceOwnerIdBuilder() {}
-
-      public InvoiceOwnerIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public InvoiceOwnerIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public InvoiceOwnerIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public InvoiceOwnerIdParams build() {
-        return new InvoiceOwnerIdParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportSubscriptionsParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportSubscriptionsParams.java
deleted file mode 100644
index c7702dec..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportSubscriptionsParams.java
+++ /dev/null
@@ -1,1855 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportSubscriptionsParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportSubscriptionsParams(ExportSubscriptionsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportSubscriptionsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportSubscriptionsBuilder builder() {
-    return new ExportSubscriptionsBuilder();
-  }
-
-  public static final class ExportSubscriptionsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportSubscriptionsBuilder() {}
-
-    public ExportSubscriptionsBuilder exportType(ExportType value) {
-
-      formData.put("export_type", value);
-
-      return this;
-    }
-
-    public ExportSubscriptionsBuilder itemId(ItemIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportSubscriptionsBuilder itemPriceId(ItemPriceIdParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_price_id[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportSubscriptionsBuilder cancelReasonCode(CancelReasonCodeParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "cancel_reason_code[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportSubscriptionsBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportSubscriptionsParams build() {
-      return new ExportSubscriptionsParams(this);
-    }
-  }
-
-  public enum ExportType {
-    DATA("data"),
-
-    IMPORT_FRIENDLY_DATA("import_friendly_data"),
-
-    /** An enum member indicating that ExportType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ExportType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ExportType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ExportType enumValue : ExportType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ItemIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemIdParams(ItemIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemIdBuilder builder() {
-      return new ItemIdBuilder();
-    }
-
-    public static final class ItemIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemIdBuilder() {}
-
-      public ItemIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemIdParams build() {
-        return new ItemIdParams(this);
-      }
-    }
-  }
-
-  public static final class ItemPriceIdParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemPriceIdParams(ItemPriceIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemPriceIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemPriceIdBuilder builder() {
-      return new ItemPriceIdBuilder();
-    }
-
-    public static final class ItemPriceIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemPriceIdBuilder() {}
-
-      public ItemPriceIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ItemPriceIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ItemPriceIdParams build() {
-        return new ItemPriceIdParams(this);
-      }
-    }
-  }
-
-  public static final class CancelReasonCodeParams {
-
-    private final Map<String, Object> formData;
-
-    private CancelReasonCodeParams(CancelReasonCodeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CancelReasonCodeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CancelReasonCodeBuilder builder() {
-      return new CancelReasonCodeBuilder();
-    }
-
-    public static final class CancelReasonCodeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CancelReasonCodeBuilder() {}
-
-      public CancelReasonCodeBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CancelReasonCodeParams build() {
-        return new CancelReasonCodeParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder customerId(CustomerIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "customer_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder status(StatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder cancelReason(CancelReasonParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "cancel_reason[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder remainingBillingCycles(RemainingBillingCyclesParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "remaining_billing_cycles[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder createdAt(CreatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "created_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder activatedAt(ActivatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "activated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder nextBillingAt(NextBillingAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "next_billing_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder cancelledAt(CancelledAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "cancelled_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder hasScheduledChanges(HasScheduledChangesParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "has_scheduled_changes[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethodParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "offline_payment_method[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder autoCloseInvoices(AutoCloseInvoicesParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "auto_close_invoices[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder channel(ChannelParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "channel[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionBuilder planId(PlanIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "plan_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerIdParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerIdParams(CustomerIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerIdBuilder builder() {
-      return new CustomerIdBuilder();
-    }
-
-    public static final class CustomerIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerIdBuilder() {}
-
-      public CustomerIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CustomerIdParams build() {
-        return new CustomerIdParams(this);
-      }
-    }
-  }
-
-  public static final class StatusParams {
-
-    private final Map<String, Object> formData;
-
-    private StatusParams(StatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatusBuilder builder() {
-      return new StatusBuilder();
-    }
-
-    public static final class StatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatusBuilder() {}
-
-      public StatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public StatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public StatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public StatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public StatusParams build() {
-        return new StatusParams(this);
-      }
-    }
-
-    public enum Is {
-      FUTURE("future"),
-
-      IN_TRIAL("in_trial"),
-
-      ACTIVE("active"),
-
-      NON_RENEWING("non_renewing"),
-
-      PAUSED("paused"),
-
-      CANCELLED("cancelled"),
-
-      TRANSFERRED("transferred"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      FUTURE("future"),
-
-      IN_TRIAL("in_trial"),
-
-      ACTIVE("active"),
-
-      NON_RENEWING("non_renewing"),
-
-      PAUSED("paused"),
-
-      CANCELLED("cancelled"),
-
-      TRANSFERRED("transferred"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CancelReasonParams {
-
-    private final Map<String, Object> formData;
-
-    private CancelReasonParams(CancelReasonBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CancelReasonParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CancelReasonBuilder builder() {
-      return new CancelReasonBuilder();
-    }
-
-    public static final class CancelReasonBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CancelReasonBuilder() {}
-
-      public CancelReasonBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CancelReasonBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CancelReasonBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CancelReasonBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CancelReasonBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public CancelReasonParams build() {
-        return new CancelReasonParams(this);
-      }
-    }
-
-    public enum Is {
-      NOT_PAID("not_paid"),
-
-      NO_CARD("no_card"),
-
-      FRAUD_REVIEW_FAILED("fraud_review_failed"),
-
-      NON_COMPLIANT_EU_CUSTOMER("non_compliant_eu_customer"),
-
-      TAX_CALCULATION_FAILED("tax_calculation_failed"),
-
-      CURRENCY_INCOMPATIBLE_WITH_GATEWAY("currency_incompatible_with_gateway"),
-
-      NON_COMPLIANT_CUSTOMER("non_compliant_customer"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      NOT_PAID("not_paid"),
-
-      NO_CARD("no_card"),
-
-      FRAUD_REVIEW_FAILED("fraud_review_failed"),
-
-      NON_COMPLIANT_EU_CUSTOMER("non_compliant_eu_customer"),
-
-      TAX_CALCULATION_FAILED("tax_calculation_failed"),
-
-      CURRENCY_INCOMPATIBLE_WITH_GATEWAY("currency_incompatible_with_gateway"),
-
-      NON_COMPLIANT_CUSTOMER("non_compliant_customer"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class RemainingBillingCyclesParams {
-
-    private final Map<String, Object> formData;
-
-    private RemainingBillingCyclesParams(RemainingBillingCyclesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for RemainingBillingCyclesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static RemainingBillingCyclesBuilder builder() {
-      return new RemainingBillingCyclesBuilder();
-    }
-
-    public static final class RemainingBillingCyclesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private RemainingBillingCyclesBuilder() {}
-
-      public RemainingBillingCyclesBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public RemainingBillingCyclesParams build() {
-        return new RemainingBillingCyclesParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CreatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private CreatedAtParams(CreatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreatedAtBuilder builder() {
-      return new CreatedAtBuilder();
-    }
-
-    public static final class CreatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreatedAtBuilder() {}
-
-      public CreatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public CreatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public CreatedAtParams build() {
-        return new CreatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class ActivatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private ActivatedAtParams(ActivatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ActivatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ActivatedAtBuilder builder() {
-      return new ActivatedAtBuilder();
-    }
-
-    public static final class ActivatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ActivatedAtBuilder() {}
-
-      public ActivatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public ActivatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public ActivatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public ActivatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public ActivatedAtBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public ActivatedAtParams build() {
-        return new ActivatedAtParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class NextBillingAtParams {
-
-    private final Map<String, Object> formData;
-
-    private NextBillingAtParams(NextBillingAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NextBillingAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NextBillingAtBuilder builder() {
-      return new NextBillingAtBuilder();
-    }
-
-    public static final class NextBillingAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NextBillingAtBuilder() {}
-
-      public NextBillingAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public NextBillingAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public NextBillingAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public NextBillingAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public NextBillingAtParams build() {
-        return new NextBillingAtParams(this);
-      }
-    }
-  }
-
-  public static final class CancelledAtParams {
-
-    private final Map<String, Object> formData;
-
-    private CancelledAtParams(CancelledAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CancelledAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CancelledAtBuilder builder() {
-      return new CancelledAtBuilder();
-    }
-
-    public static final class CancelledAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CancelledAtBuilder() {}
-
-      public CancelledAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public CancelledAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public CancelledAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public CancelledAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public CancelledAtParams build() {
-        return new CancelledAtParams(this);
-      }
-    }
-  }
-
-  public static final class HasScheduledChangesParams {
-
-    private final Map<String, Object> formData;
-
-    private HasScheduledChangesParams(HasScheduledChangesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for HasScheduledChangesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static HasScheduledChangesBuilder builder() {
-      return new HasScheduledChangesBuilder();
-    }
-
-    public static final class HasScheduledChangesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private HasScheduledChangesBuilder() {}
-
-      public HasScheduledChangesBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public HasScheduledChangesParams build() {
-        return new HasScheduledChangesParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-
-  public static final class OfflinePaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private OfflinePaymentMethodParams(OfflinePaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for OfflinePaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static OfflinePaymentMethodBuilder builder() {
-      return new OfflinePaymentMethodBuilder();
-    }
-
-    public static final class OfflinePaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private OfflinePaymentMethodBuilder() {}
-
-      public OfflinePaymentMethodBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public OfflinePaymentMethodParams build() {
-        return new OfflinePaymentMethodParams(this);
-      }
-    }
-
-    public enum Is {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AutoCloseInvoicesParams {
-
-    private final Map<String, Object> formData;
-
-    private AutoCloseInvoicesParams(AutoCloseInvoicesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AutoCloseInvoicesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AutoCloseInvoicesBuilder builder() {
-      return new AutoCloseInvoicesBuilder();
-    }
-
-    public static final class AutoCloseInvoicesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AutoCloseInvoicesBuilder() {}
-
-      public AutoCloseInvoicesBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AutoCloseInvoicesParams build() {
-        return new AutoCloseInvoicesParams(this);
-      }
-    }
-
-    public enum Is {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChannelParams {
-
-    private final Map<String, Object> formData;
-
-    private ChannelParams(ChannelBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChannelParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChannelBuilder builder() {
-      return new ChannelBuilder();
-    }
-
-    public static final class ChannelBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChannelBuilder() {}
-
-      public ChannelBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ChannelBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ChannelBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public ChannelBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public ChannelParams build() {
-        return new ChannelParams(this);
-      }
-    }
-
-    public enum Is {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      WEB("web"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PlanIdParams {
-
-    private final Map<String, Object> formData;
-
-    private PlanIdParams(PlanIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PlanIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PlanIdBuilder builder() {
-      return new PlanIdBuilder();
-    }
-
-    public static final class PlanIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PlanIdBuilder() {}
-
-      public PlanIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PlanIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PlanIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PlanIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PlanIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PlanIdParams build() {
-        return new PlanIdParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportTransactionsParams.java b/src/main/java/com/chargebee/v4/core/models/export/params/ExportTransactionsParams.java
deleted file mode 100644
index 4e97dd53..00000000
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportTransactionsParams.java
+++ /dev/null
@@ -1,1922 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.export.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ExportTransactionsParams {
-
-  private final Map<String, Object> formData;
-
-  private ExportTransactionsParams(ExportTransactionsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ExportTransactionsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ExportTransactionsBuilder builder() {
-    return new ExportTransactionsBuilder();
-  }
-
-  public static final class ExportTransactionsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ExportTransactionsBuilder() {}
-
-    public ExportTransactionsBuilder transaction(TransactionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "transaction[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ExportTransactionsParams build() {
-      return new ExportTransactionsParams(this);
-    }
-  }
-
-  public static final class TransactionParams {
-
-    private final Map<String, Object> formData;
-
-    private TransactionParams(TransactionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TransactionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TransactionBuilder builder() {
-      return new TransactionBuilder();
-    }
-
-    public static final class TransactionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TransactionBuilder() {}
-
-      public TransactionBuilder id(IdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder customerId(CustomerIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "customer_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder subscriptionId(SubscriptionIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "subscription_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder paymentSourceId(PaymentSourceIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "payment_source_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder paymentMethod(PaymentMethodParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "payment_method[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder gateway(GatewayParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "gateway[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder gatewayAccountId(GatewayAccountIdParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "gateway_account_id[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder idAtGateway(IdAtGatewayParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "id_at_gateway[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder referenceNumber(ReferenceNumberParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "reference_number[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder type(TypeParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "type[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder date(DateParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "date[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder amount(AmountParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder amountCapturable(AmountCapturableParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "amount_capturable[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder status(StatusParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "status[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionBuilder updatedAt(UpdatedAtParams value) {
-        if (value != null) {
-          Map<String, Object> nestedData = value.toFormData();
-          for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-            String nestedKey = "updated_at[" + entry.getKey() + "]";
-            formData.put(nestedKey, entry.getValue());
-          }
-        }
-        return this;
-      }
-
-      public TransactionParams build() {
-        return new TransactionParams(this);
-      }
-    }
-  }
-
-  public static final class IdParams {
-
-    private final Map<String, Object> formData;
-
-    private IdParams(IdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdBuilder builder() {
-      return new IdBuilder();
-    }
-
-    public static final class IdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdBuilder() {}
-
-      public IdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public IdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public IdParams build() {
-        return new IdParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerIdParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerIdParams(CustomerIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerIdBuilder builder() {
-      return new CustomerIdBuilder();
-    }
-
-    public static final class CustomerIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerIdBuilder() {}
-
-      public CustomerIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public CustomerIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public CustomerIdParams build() {
-        return new CustomerIdParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionIdParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionIdParams(SubscriptionIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionIdBuilder builder() {
-      return new SubscriptionIdBuilder();
-    }
-
-    public static final class SubscriptionIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionIdBuilder() {}
-
-      public SubscriptionIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public SubscriptionIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public SubscriptionIdParams build() {
-        return new SubscriptionIdParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentSourceIdParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentSourceIdParams(PaymentSourceIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentSourceIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentSourceIdBuilder builder() {
-      return new PaymentSourceIdBuilder();
-    }
-
-    public static final class PaymentSourceIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentSourceIdBuilder() {}
-
-      public PaymentSourceIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PaymentSourceIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PaymentSourceIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public PaymentSourceIdBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public PaymentSourceIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PaymentSourceIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PaymentSourceIdParams build() {
-        return new PaymentSourceIdParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentMethodParams(PaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentMethodBuilder builder() {
-      return new PaymentMethodBuilder();
-    }
-
-    public static final class PaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentMethodBuilder() {}
-
-      public PaymentMethodBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public PaymentMethodParams build() {
-        return new PaymentMethodParams(this);
-      }
-    }
-
-    public enum Is {
-      CARD("card"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      CHARGEBACK("chargeback"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      ALIPAY("alipay"),
-
-      UNIONPAY("unionpay"),
-
-      APPLE_PAY("apple_pay"),
-
-      WECHAT_PAY("wechat_pay"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      IDEAL("ideal"),
-
-      GOOGLE_PAY("google_pay"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GIROPAY("giropay"),
-
-      DOTPAY("dotpay"),
-
-      OTHER("other"),
-
-      APP_STORE("app_store"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PLAY_STORE("play_store"),
-
-      CUSTOM("custom"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      CARD("card"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      CHARGEBACK("chargeback"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      ALIPAY("alipay"),
-
-      UNIONPAY("unionpay"),
-
-      APPLE_PAY("apple_pay"),
-
-      WECHAT_PAY("wechat_pay"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      IDEAL("ideal"),
-
-      GOOGLE_PAY("google_pay"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GIROPAY("giropay"),
-
-      DOTPAY("dotpay"),
-
-      OTHER("other"),
-
-      APP_STORE("app_store"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PLAY_STORE("play_store"),
-
-      CUSTOM("custom"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class GatewayParams {
-
-    private final Map<String, Object> formData;
-
-    private GatewayParams(GatewayBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GatewayParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GatewayBuilder builder() {
-      return new GatewayBuilder();
-    }
-
-    public static final class GatewayBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GatewayBuilder() {}
-
-      public GatewayBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public GatewayBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public GatewayBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public GatewayBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public GatewayParams build() {
-        return new GatewayParams(this);
-      }
-    }
-
-    public enum Is {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      GOCARDLESS("gocardless"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      NOT_APPLICABLE("not_applicable"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      GOCARDLESS("gocardless"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      NOT_APPLICABLE("not_applicable"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class GatewayAccountIdParams {
-
-    private final Map<String, Object> formData;
-
-    private GatewayAccountIdParams(GatewayAccountIdBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GatewayAccountIdParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GatewayAccountIdBuilder builder() {
-      return new GatewayAccountIdBuilder();
-    }
-
-    public static final class GatewayAccountIdBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GatewayAccountIdBuilder() {}
-
-      public GatewayAccountIdBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public GatewayAccountIdBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public GatewayAccountIdBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public GatewayAccountIdBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public GatewayAccountIdBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public GatewayAccountIdParams build() {
-        return new GatewayAccountIdParams(this);
-      }
-    }
-  }
-
-  public static final class IdAtGatewayParams {
-
-    private final Map<String, Object> formData;
-
-    private IdAtGatewayParams(IdAtGatewayBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for IdAtGatewayParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static IdAtGatewayBuilder builder() {
-      return new IdAtGatewayBuilder();
-    }
-
-    public static final class IdAtGatewayBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private IdAtGatewayBuilder() {}
-
-      public IdAtGatewayBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public IdAtGatewayBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public IdAtGatewayBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public IdAtGatewayParams build() {
-        return new IdAtGatewayParams(this);
-      }
-    }
-  }
-
-  public static final class ReferenceNumberParams {
-
-    private final Map<String, Object> formData;
-
-    private ReferenceNumberParams(ReferenceNumberBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ReferenceNumberParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ReferenceNumberBuilder builder() {
-      return new ReferenceNumberBuilder();
-    }
-
-    public static final class ReferenceNumberBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ReferenceNumberBuilder() {}
-
-      public ReferenceNumberBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public ReferenceNumberBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public ReferenceNumberBuilder startsWith(String value) {
-
-        formData.put("starts_with", value);
-
-        return this;
-      }
-
-      public ReferenceNumberBuilder isPresent(IsPresent value) {
-
-        formData.put("is_present", value);
-
-        return this;
-      }
-
-      public ReferenceNumberParams build() {
-        return new ReferenceNumberParams(this);
-      }
-    }
-
-    public enum IsPresent {
-      TRUE("true"),
-
-      FALSE("false"),
-
-      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsPresent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsPresent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsPresent enumValue : IsPresent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TypeParams {
-
-    private final Map<String, Object> formData;
-
-    private TypeParams(TypeBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TypeParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TypeBuilder builder() {
-      return new TypeBuilder();
-    }
-
-    public static final class TypeBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TypeBuilder() {}
-
-      public TypeBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public TypeBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public TypeBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public TypeBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public TypeParams build() {
-        return new TypeParams(this);
-      }
-    }
-
-    public enum Is {
-      AUTHORIZATION("authorization"),
-
-      PAYMENT("payment"),
-
-      REFUND("refund"),
-
-      PAYMENT_REVERSAL("payment_reversal"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      AUTHORIZATION("authorization"),
-
-      PAYMENT("payment"),
-
-      REFUND("refund"),
-
-      PAYMENT_REVERSAL("payment_reversal"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DateParams {
-
-    private final Map<String, Object> formData;
-
-    private DateParams(DateBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DateParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DateBuilder builder() {
-      return new DateBuilder();
-    }
-
-    public static final class DateBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DateBuilder() {}
-
-      public DateBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public DateBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public DateBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public DateBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public DateParams build() {
-        return new DateParams(this);
-      }
-    }
-  }
-
-  public static final class AmountParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountParams(AmountBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountBuilder builder() {
-      return new AmountBuilder();
-    }
-
-    public static final class AmountBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountBuilder() {}
-
-      public AmountBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountParams build() {
-        return new AmountParams(this);
-      }
-    }
-  }
-
-  public static final class AmountCapturableParams {
-
-    private final Map<String, Object> formData;
-
-    private AmountCapturableParams(AmountCapturableBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AmountCapturableParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AmountCapturableBuilder builder() {
-      return new AmountCapturableBuilder();
-    }
-
-    public static final class AmountCapturableBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AmountCapturableBuilder() {}
-
-      public AmountCapturableBuilder is(String value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public AmountCapturableBuilder isNot(String value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public AmountCapturableBuilder lt(String value) {
-
-        formData.put("lt", value);
-
-        return this;
-      }
-
-      public AmountCapturableBuilder lte(String value) {
-
-        formData.put("lte", value);
-
-        return this;
-      }
-
-      public AmountCapturableBuilder gt(String value) {
-
-        formData.put("gt", value);
-
-        return this;
-      }
-
-      public AmountCapturableBuilder gte(String value) {
-
-        formData.put("gte", value);
-
-        return this;
-      }
-
-      public AmountCapturableBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public AmountCapturableParams build() {
-        return new AmountCapturableParams(this);
-      }
-    }
-  }
-
-  public static final class StatusParams {
-
-    private final Map<String, Object> formData;
-
-    private StatusParams(StatusBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatusParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatusBuilder builder() {
-      return new StatusBuilder();
-    }
-
-    public static final class StatusBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatusBuilder() {}
-
-      public StatusBuilder is(Is value) {
-
-        formData.put("is", value);
-
-        return this;
-      }
-
-      public StatusBuilder isNot(IsNot value) {
-
-        formData.put("is_not", value);
-
-        return this;
-      }
-
-      public StatusBuilder in(String value) {
-
-        formData.put("in", value);
-
-        return this;
-      }
-
-      public StatusBuilder notIn(String value) {
-
-        formData.put("not_in", value);
-
-        return this;
-      }
-
-      public StatusParams build() {
-        return new StatusParams(this);
-      }
-    }
-
-    public enum Is {
-      IN_PROGRESS("in_progress"),
-
-      SUCCESS("success"),
-
-      VOIDED("voided"),
-
-      FAILURE("failure"),
-
-      TIMEOUT("timeout"),
-
-      NEEDS_ATTENTION("needs_attention"),
-
-      LATE_FAILURE("late_failure"),
-
-      /** An enum member indicating that Is was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Is(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Is fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Is enumValue : Is.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum IsNot {
-      IN_PROGRESS("in_progress"),
-
-      SUCCESS("success"),
-
-      VOIDED("voided"),
-
-      FAILURE("failure"),
-
-      TIMEOUT("timeout"),
-
-      NEEDS_ATTENTION("needs_attention"),
-
-      LATE_FAILURE("late_failure"),
-
-      /** An enum member indicating that IsNot was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      IsNot(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static IsNot fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (IsNot enumValue : IsNot.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class UpdatedAtParams {
-
-    private final Map<String, Object> formData;
-
-    private UpdatedAtParams(UpdatedAtBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UpdatedAtParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UpdatedAtBuilder builder() {
-      return new UpdatedAtBuilder();
-    }
-
-    public static final class UpdatedAtBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UpdatedAtBuilder() {}
-
-      public UpdatedAtBuilder after(String value) {
-
-        formData.put("after", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder before(String value) {
-
-        formData.put("before", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder on(String value) {
-
-        formData.put("on", value);
-
-        return this;
-      }
-
-      public UpdatedAtBuilder between(String value) {
-
-        formData.put("between", value);
-
-        return this;
-      }
-
-      public UpdatedAtParams build() {
-        return new UpdatedAtParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureArchiveParams.java b/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureArchiveParams.java
deleted file mode 100644
index 9550bab1..00000000
--- a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureArchiveParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.feature.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class FeatureArchiveParams {
-
-  private final Map<String, Object> formData;
-
-  private FeatureArchiveParams(FeatureArchiveBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for FeatureArchiveParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static FeatureArchiveBuilder builder() {
-    return new FeatureArchiveBuilder();
-  }
-
-  public static final class FeatureArchiveBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private FeatureArchiveBuilder() {}
-
-    public FeatureArchiveParams build() {
-      return new FeatureArchiveParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureCreateParams.java b/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureCreateParams.java
deleted file mode 100644
index f76069fb..00000000
--- a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureCreateParams.java
+++ /dev/null
@@ -1,221 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.feature.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class FeatureCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private FeatureCreateParams(FeatureCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for FeatureCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static FeatureCreateBuilder builder() {
-    return new FeatureCreateBuilder();
-  }
-
-  public static final class FeatureCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private FeatureCreateBuilder() {}
-
-    public FeatureCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public FeatureCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public FeatureCreateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public FeatureCreateBuilder type(Type value) {
-
-      formData.put("type", value);
-
-      return this;
-    }
-
-    public FeatureCreateBuilder unit(String value) {
-
-      formData.put("unit", value);
-
-      return this;
-    }
-
-    public FeatureCreateBuilder levels(List<LevelsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          LevelsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "levels[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public FeatureCreateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public FeatureCreateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public FeatureCreateParams build() {
-      return new FeatureCreateParams(this);
-    }
-  }
-
-  public enum Type {
-    SWITCH("switch"),
-
-    CUSTOM("custom"),
-
-    QUANTITY("quantity"),
-
-    RANGE("range"),
-
-    /** An enum member indicating that Type was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Type(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Type fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Type enumValue : Type.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class LevelsParams {
-
-    private final Map<String, Object> formData;
-
-    private LevelsParams(LevelsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LevelsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LevelsBuilder builder() {
-      return new LevelsBuilder();
-    }
-
-    public static final class LevelsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LevelsBuilder() {}
-
-      public LevelsBuilder name(String value) {
-
-        formData.put("name", value);
-
-        return this;
-      }
-
-      public LevelsBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public LevelsBuilder isUnlimited(Boolean value) {
-
-        formData.put("is_unlimited", value);
-
-        return this;
-      }
-
-      public LevelsBuilder level(Integer value) {
-
-        formData.put("level", value);
-
-        return this;
-      }
-
-      public LevelsParams build() {
-        return new LevelsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureDeleteParams.java
deleted file mode 100644
index 5739dd21..00000000
--- a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureDeleteParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.feature.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class FeatureDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private FeatureDeleteParams(FeatureDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for FeatureDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static FeatureDeleteBuilder builder() {
-    return new FeatureDeleteBuilder();
-  }
-
-  public static final class FeatureDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private FeatureDeleteBuilder() {}
-
-    public FeatureDeleteParams build() {
-      return new FeatureDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureUpdateParams.java
deleted file mode 100644
index 634c2764..00000000
--- a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureUpdateParams.java
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.feature.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class FeatureUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private FeatureUpdateParams(FeatureUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for FeatureUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static FeatureUpdateBuilder builder() {
-    return new FeatureUpdateBuilder();
-  }
-
-  public static final class FeatureUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private FeatureUpdateBuilder() {}
-
-    public FeatureUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public FeatureUpdateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public FeatureUpdateBuilder unit(String value) {
-
-      formData.put("unit", value);
-
-      return this;
-    }
-
-    public FeatureUpdateBuilder levels(List<LevelsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          LevelsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "levels[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public FeatureUpdateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public FeatureUpdateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public FeatureUpdateParams build() {
-      return new FeatureUpdateParams(this);
-    }
-  }
-
-  public static final class LevelsParams {
-
-    private final Map<String, Object> formData;
-
-    private LevelsParams(LevelsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LevelsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LevelsBuilder builder() {
-      return new LevelsBuilder();
-    }
-
-    public static final class LevelsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LevelsBuilder() {}
-
-      public LevelsBuilder name(String value) {
-
-        formData.put("name", value);
-
-        return this;
-      }
-
-      public LevelsBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public LevelsBuilder isUnlimited(Boolean value) {
-
-        formData.put("is_unlimited", value);
-
-        return this;
-      }
-
-      public LevelsBuilder level(Integer value) {
-
-        formData.put("level", value);
-
-        return this;
-      }
-
-      public LevelsParams build() {
-        return new LevelsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftCancelParams.java b/src/main/java/com/chargebee/v4/core/models/gift/params/GiftCancelParams.java
deleted file mode 100644
index 3579fa9b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftCancelParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.gift.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class GiftCancelParams {
-
-  private final Map<String, Object> formData;
-
-  private GiftCancelParams(GiftCancelBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for GiftCancelParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static GiftCancelBuilder builder() {
-    return new GiftCancelBuilder();
-  }
-
-  public static final class GiftCancelBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private GiftCancelBuilder() {}
-
-    public GiftCancelParams build() {
-      return new GiftCancelParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftClaimParams.java b/src/main/java/com/chargebee/v4/core/models/gift/params/GiftClaimParams.java
deleted file mode 100644
index 811393ea..00000000
--- a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftClaimParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.gift.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class GiftClaimParams {
-
-  private final Map<String, Object> formData;
-
-  private GiftClaimParams(GiftClaimBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for GiftClaimParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static GiftClaimBuilder builder() {
-    return new GiftClaimBuilder();
-  }
-
-  public static final class GiftClaimBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private GiftClaimBuilder() {}
-
-    public GiftClaimParams build() {
-      return new GiftClaimParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftCreateForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/gift/params/GiftCreateForItemsParams.java
deleted file mode 100644
index 487b2fbe..00000000
--- a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftCreateForItemsParams.java
+++ /dev/null
@@ -1,616 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.gift.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class GiftCreateForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private GiftCreateForItemsParams(GiftCreateForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for GiftCreateForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static GiftCreateForItemsBuilder builder() {
-    return new GiftCreateForItemsBuilder();
-  }
-
-  public static final class GiftCreateForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private GiftCreateForItemsBuilder() {}
-
-    public GiftCreateForItemsBuilder scheduledAt(Timestamp value) {
-
-      formData.put("scheduled_at", value);
-
-      return this;
-    }
-
-    public GiftCreateForItemsBuilder autoClaim(Boolean value) {
-
-      formData.put("auto_claim", value);
-
-      return this;
-    }
-
-    public GiftCreateForItemsBuilder noExpiry(Boolean value) {
-
-      formData.put("no_expiry", value);
-
-      return this;
-    }
-
-    public GiftCreateForItemsBuilder claimExpiryDate(Timestamp value) {
-
-      formData.put("claim_expiry_date", value);
-
-      return this;
-    }
-
-    public GiftCreateForItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public GiftCreateForItemsBuilder gifter(GifterParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "gifter[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public GiftCreateForItemsBuilder giftReceiver(GiftReceiverParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "gift_receiver[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public GiftCreateForItemsBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public GiftCreateForItemsBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public GiftCreateForItemsBuilder subscriptionItems(List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public GiftCreateForItemsParams build() {
-      return new GiftCreateForItemsParams(this);
-    }
-  }
-
-  public static final class GifterParams {
-
-    private final Map<String, Object> formData;
-
-    private GifterParams(GifterBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GifterParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GifterBuilder builder() {
-      return new GifterBuilder();
-    }
-
-    public static final class GifterBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GifterBuilder() {}
-
-      public GifterBuilder customerId(String value) {
-
-        formData.put("customer_id", value);
-
-        return this;
-      }
-
-      public GifterBuilder signature(String value) {
-
-        formData.put("signature", value);
-
-        return this;
-      }
-
-      public GifterBuilder note(String value) {
-
-        formData.put("note", value);
-
-        return this;
-      }
-
-      public GifterBuilder paymentSrcId(String value) {
-
-        formData.put("payment_src_id", value);
-
-        return this;
-      }
-
-      public GifterParams build() {
-        return new GifterParams(this);
-      }
-    }
-  }
-
-  public static final class GiftReceiverParams {
-
-    private final Map<String, Object> formData;
-
-    private GiftReceiverParams(GiftReceiverBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GiftReceiverParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GiftReceiverBuilder builder() {
-      return new GiftReceiverBuilder();
-    }
-
-    public static final class GiftReceiverBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GiftReceiverBuilder() {}
-
-      public GiftReceiverBuilder customerId(String value) {
-
-        formData.put("customer_id", value);
-
-        return this;
-      }
-
-      public GiftReceiverBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public GiftReceiverBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public GiftReceiverBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public GiftReceiverParams build() {
-        return new GiftReceiverParams(this);
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftCreateParams.java b/src/main/java/com/chargebee/v4/core/models/gift/params/GiftCreateParams.java
deleted file mode 100644
index b898e4c6..00000000
--- a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftCreateParams.java
+++ /dev/null
@@ -1,678 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.gift.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class GiftCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private GiftCreateParams(GiftCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for GiftCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static GiftCreateBuilder builder() {
-    return new GiftCreateBuilder();
-  }
-
-  public static final class GiftCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private GiftCreateBuilder() {}
-
-    public GiftCreateBuilder scheduledAt(Timestamp value) {
-
-      formData.put("scheduled_at", value);
-
-      return this;
-    }
-
-    public GiftCreateBuilder autoClaim(Boolean value) {
-
-      formData.put("auto_claim", value);
-
-      return this;
-    }
-
-    public GiftCreateBuilder noExpiry(Boolean value) {
-
-      formData.put("no_expiry", value);
-
-      return this;
-    }
-
-    public GiftCreateBuilder claimExpiryDate(Timestamp value) {
-
-      formData.put("claim_expiry_date", value);
-
-      return this;
-    }
-
-    public GiftCreateBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public GiftCreateBuilder gifter(GifterParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "gifter[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public GiftCreateBuilder giftReceiver(GiftReceiverParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "gift_receiver[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public GiftCreateBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public GiftCreateBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public GiftCreateBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public GiftCreateBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public GiftCreateParams build() {
-      return new GiftCreateParams(this);
-    }
-  }
-
-  public static final class GifterParams {
-
-    private final Map<String, Object> formData;
-
-    private GifterParams(GifterBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GifterParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GifterBuilder builder() {
-      return new GifterBuilder();
-    }
-
-    public static final class GifterBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GifterBuilder() {}
-
-      public GifterBuilder customerId(String value) {
-
-        formData.put("customer_id", value);
-
-        return this;
-      }
-
-      public GifterBuilder signature(String value) {
-
-        formData.put("signature", value);
-
-        return this;
-      }
-
-      public GifterBuilder note(String value) {
-
-        formData.put("note", value);
-
-        return this;
-      }
-
-      public GifterBuilder paymentSrcId(String value) {
-
-        formData.put("payment_src_id", value);
-
-        return this;
-      }
-
-      public GifterParams build() {
-        return new GifterParams(this);
-      }
-    }
-  }
-
-  public static final class GiftReceiverParams {
-
-    private final Map<String, Object> formData;
-
-    private GiftReceiverParams(GiftReceiverBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GiftReceiverParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GiftReceiverBuilder builder() {
-      return new GiftReceiverBuilder();
-    }
-
-    public static final class GiftReceiverBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GiftReceiverBuilder() {}
-
-      public GiftReceiverBuilder customerId(String value) {
-
-        formData.put("customer_id", value);
-
-        return this;
-      }
-
-      public GiftReceiverBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public GiftReceiverBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public GiftReceiverBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public GiftReceiverParams build() {
-        return new GiftReceiverParams(this);
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder planId(String value) {
-
-        formData.put("plan_id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantity(Integer value) {
-
-        formData.put("plan_quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantityInDecimal(String value) {
-
-        formData.put("plan_quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftUpdateGiftParams.java b/src/main/java/com/chargebee/v4/core/models/gift/params/GiftUpdateGiftParams.java
deleted file mode 100644
index fe0ad96a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftUpdateGiftParams.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.gift.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class GiftUpdateGiftParams {
-
-  private final Map<String, Object> formData;
-
-  private GiftUpdateGiftParams(GiftUpdateGiftBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for GiftUpdateGiftParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static GiftUpdateGiftBuilder builder() {
-    return new GiftUpdateGiftBuilder();
-  }
-
-  public static final class GiftUpdateGiftBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private GiftUpdateGiftBuilder() {}
-
-    public GiftUpdateGiftBuilder scheduledAt(Timestamp value) {
-
-      formData.put("scheduled_at", value);
-
-      return this;
-    }
-
-    public GiftUpdateGiftBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public GiftUpdateGiftParams build() {
-      return new GiftUpdateGiftParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageAcceptQuoteParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageAcceptQuoteParams.java
deleted file mode 100644
index ca61bd03..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageAcceptQuoteParams.java
+++ /dev/null
@@ -1,133 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class HostedPageAcceptQuoteParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageAcceptQuoteParams(HostedPageAcceptQuoteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageAcceptQuoteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageAcceptQuoteBuilder builder() {
-    return new HostedPageAcceptQuoteBuilder();
-  }
-
-  public static final class HostedPageAcceptQuoteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageAcceptQuoteBuilder() {}
-
-    public HostedPageAcceptQuoteBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageAcceptQuoteBuilder layout(Layout value) {
-
-      formData.put("layout", value);
-
-      return this;
-    }
-
-    public HostedPageAcceptQuoteBuilder quote(QuoteParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "quote[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageAcceptQuoteParams build() {
-      return new HostedPageAcceptQuoteParams(this);
-    }
-  }
-
-  public enum Layout {
-    IN_APP("in_app"),
-
-    FULL_PAGE("full_page"),
-
-    /** An enum member indicating that Layout was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Layout(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Layout fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Layout enumValue : Layout.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class QuoteParams {
-
-    private final Map<String, Object> formData;
-
-    private QuoteParams(QuoteBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for QuoteParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static QuoteBuilder builder() {
-      return new QuoteBuilder();
-    }
-
-    public static final class QuoteBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private QuoteBuilder() {}
-
-      public QuoteBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public QuoteParams build() {
-        return new QuoteParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutExistingForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutExistingForItemsParams.java
deleted file mode 100644
index da484cd6..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutExistingForItemsParams.java
+++ /dev/null
@@ -1,1511 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class HostedPageCheckoutExistingForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageCheckoutExistingForItemsParams(
-      HostedPageCheckoutExistingForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageCheckoutExistingForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageCheckoutExistingForItemsBuilder builder() {
-    return new HostedPageCheckoutExistingForItemsBuilder();
-  }
-
-  public static final class HostedPageCheckoutExistingForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageCheckoutExistingForItemsBuilder() {}
-
-    public HostedPageCheckoutExistingForItemsBuilder layout(Layout value) {
-
-      formData.put("layout", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder mandatoryItemsToRemove(List<String> value) {
-
-      formData.put("mandatory_items_to_remove", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder replaceItemsList(Boolean value) {
-
-      formData.put("replace_items_list", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder reactivateFrom(Timestamp value) {
-
-      formData.put("reactivate_from", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder billingAlignmentMode(
-        BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder replaceCouponList(Boolean value) {
-
-      formData.put("replace_coupon_list", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder reactivate(Boolean value) {
-
-      formData.put("reactivate", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder forceTermReset(Boolean value) {
-
-      formData.put("force_term_reset", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder changeOption(ChangeOption value) {
-
-      formData.put("change_option", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder changesScheduledAt(Timestamp value) {
-
-      formData.put("changes_scheduled_at", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder cancelUrl(String value) {
-
-      formData.put("cancel_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder passThruContent(String value) {
-
-      formData.put("pass_thru_content", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder allowOfflinePaymentMethods(Boolean value) {
-
-      formData.put("allow_offline_payment_methods", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsBuilder entityIdentifiers(
-        List<EntityIdentifiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EntityIdentifiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "entity_identifiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingForItemsParams build() {
-      return new HostedPageCheckoutExistingForItemsParams(this);
-    }
-  }
-
-  public enum Layout {
-    IN_APP("in_app"),
-
-    FULL_PAGE("full_page"),
-
-    /** An enum member indicating that Layout was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Layout(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Layout fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Layout enumValue : Layout.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChangeOption {
-    IMMEDIATELY("immediately"),
-
-    END_OF_TERM("end_of_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChangeOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChangeOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChangeOption enumValue : ChangeOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder coupon(String value) {
-
-        formData.put("coupon", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder autoCollection(AutoCollection value) {
-
-        formData.put("auto_collection", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder invoiceNotes(String value) {
-
-        formData.put("invoice_notes", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum AutoCollection {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AutoCollection(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AutoCollection fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AutoCollection enumValue : AutoCollection.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder isEinvoiceEnabled(Boolean value) {
-
-        formData.put("is_einvoice_enabled", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityIdentifierScheme(String value) {
-
-        formData.put("entity_identifier_scheme", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityIdentifierStandard(String value) {
-
-        formData.put("entity_identifier_standard", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder operationType(OperationType value) {
-
-        formData.put("operation_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OperationType {
-      ADD("add"),
-
-      REMOVE("remove"),
-
-      /** An enum member indicating that OperationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OperationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OperationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OperationType enumValue : OperationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class EntityIdentifiersParams {
-
-    private final Map<String, Object> formData;
-
-    private EntityIdentifiersParams(EntityIdentifiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EntityIdentifiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EntityIdentifiersBuilder builder() {
-      return new EntityIdentifiersBuilder();
-    }
-
-    public static final class EntityIdentifiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EntityIdentifiersBuilder() {}
-
-      public EntityIdentifiersBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder scheme(String value) {
-
-        formData.put("scheme", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder operation(Operation value) {
-
-        formData.put("operation", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder standard(String value) {
-
-        formData.put("standard", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersParams build() {
-        return new EntityIdentifiersParams(this);
-      }
-    }
-
-    public enum Operation {
-      CREATE("create"),
-
-      UPDATE("update"),
-
-      DELETE("delete"),
-
-      /** An enum member indicating that Operation was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Operation(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Operation fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Operation enumValue : Operation.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutExistingParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutExistingParams.java
deleted file mode 100644
index f5b815af..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutExistingParams.java
+++ /dev/null
@@ -1,1001 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class HostedPageCheckoutExistingParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageCheckoutExistingParams(HostedPageCheckoutExistingBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageCheckoutExistingParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageCheckoutExistingBuilder builder() {
-    return new HostedPageCheckoutExistingBuilder();
-  }
-
-  public static final class HostedPageCheckoutExistingBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageCheckoutExistingBuilder() {}
-
-    public HostedPageCheckoutExistingBuilder replaceAddonList(Boolean value) {
-
-      formData.put("replace_addon_list", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder mandatoryAddonsToRemove(List<String> value) {
-
-      formData.put("mandatory_addons_to_remove", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder reactivateFrom(Timestamp value) {
-
-      formData.put("reactivate_from", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder replaceCouponList(Boolean value) {
-
-      formData.put("replace_coupon_list", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder reactivate(Boolean value) {
-
-      formData.put("reactivate", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder forceTermReset(Boolean value) {
-
-      formData.put("force_term_reset", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder cancelUrl(String value) {
-
-      formData.put("cancel_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder passThruContent(String value) {
-
-      formData.put("pass_thru_content", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder embed(Boolean value) {
-
-      formData.put("embed", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder iframeMessaging(Boolean value) {
-
-      formData.put("iframe_messaging", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder allowOfflinePaymentMethods(Boolean value) {
-
-      formData.put("allow_offline_payment_methods", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutExistingParams build() {
-      return new HostedPageCheckoutExistingParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planId(String value) {
-
-        formData.put("plan_id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantity(Integer value) {
-
-        formData.put("plan_quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPrice(Long value) {
-
-        formData.put("plan_unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantityInDecimal(String value) {
-
-        formData.put("plan_quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
-
-        formData.put("plan_unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder coupon(String value) {
-
-        formData.put("coupon", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder autoCollection(AutoCollection value) {
-
-        formData.put("auto_collection", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder invoiceNotes(String value) {
-
-        formData.put("invoice_notes", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum AutoCollection {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AutoCollection(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AutoCollection fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AutoCollection enumValue : AutoCollection.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
-
-        formData.put("charge_on", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum ChargeOn {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOn enumValue : ChargeOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutGiftForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutGiftForItemsParams.java
deleted file mode 100644
index 52d3fa59..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutGiftForItemsParams.java
+++ /dev/null
@@ -1,181 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class HostedPageCheckoutGiftForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageCheckoutGiftForItemsParams(HostedPageCheckoutGiftForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageCheckoutGiftForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageCheckoutGiftForItemsBuilder builder() {
-    return new HostedPageCheckoutGiftForItemsBuilder();
-  }
-
-  public static final class HostedPageCheckoutGiftForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageCheckoutGiftForItemsBuilder() {}
-
-    public HostedPageCheckoutGiftForItemsBuilder businessEntityId(String value) {
-
-      formData.put("business_entity_id", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutGiftForItemsBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutGiftForItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutGiftForItemsBuilder gifter(GifterParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "gifter[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutGiftForItemsBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutGiftForItemsParams build() {
-      return new HostedPageCheckoutGiftForItemsParams(this);
-    }
-  }
-
-  public static final class GifterParams {
-
-    private final Map<String, Object> formData;
-
-    private GifterParams(GifterBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GifterParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GifterBuilder builder() {
-      return new GifterBuilder();
-    }
-
-    public static final class GifterBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GifterBuilder() {}
-
-      public GifterBuilder customerId(String value) {
-
-        formData.put("customer_id", value);
-
-        return this;
-      }
-
-      public GifterParams build() {
-        return new GifterParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutGiftParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutGiftParams.java
deleted file mode 100644
index 73e84a69..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutGiftParams.java
+++ /dev/null
@@ -1,243 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class HostedPageCheckoutGiftParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageCheckoutGiftParams(HostedPageCheckoutGiftBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageCheckoutGiftParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageCheckoutGiftBuilder builder() {
-    return new HostedPageCheckoutGiftBuilder();
-  }
-
-  public static final class HostedPageCheckoutGiftBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageCheckoutGiftBuilder() {}
-
-    public HostedPageCheckoutGiftBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutGiftBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutGiftBuilder gifter(GifterParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "gifter[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutGiftBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutGiftBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutGiftParams build() {
-      return new HostedPageCheckoutGiftParams(this);
-    }
-  }
-
-  public static final class GifterParams {
-
-    private final Map<String, Object> formData;
-
-    private GifterParams(GifterBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GifterParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GifterBuilder builder() {
-      return new GifterBuilder();
-    }
-
-    public static final class GifterBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GifterBuilder() {}
-
-      public GifterBuilder customerId(String value) {
-
-        formData.put("customer_id", value);
-
-        return this;
-      }
-
-      public GifterParams build() {
-        return new GifterParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder planId(String value) {
-
-        formData.put("plan_id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantity(Integer value) {
-
-        formData.put("plan_quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantityInDecimal(String value) {
-
-        formData.put("plan_quantity_in_decimal", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder coupon(String value) {
-
-        formData.put("coupon", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutNewForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutNewForItemsParams.java
deleted file mode 100644
index 5bceb233..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutNewForItemsParams.java
+++ /dev/null
@@ -1,1857 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class HostedPageCheckoutNewForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageCheckoutNewForItemsParams(HostedPageCheckoutNewForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageCheckoutNewForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageCheckoutNewForItemsBuilder builder() {
-    return new HostedPageCheckoutNewForItemsBuilder();
-  }
-
-  public static final class HostedPageCheckoutNewForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageCheckoutNewForItemsBuilder() {}
-
-    public HostedPageCheckoutNewForItemsBuilder layout(Layout value) {
-
-      formData.put("layout", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder businessEntityId(String value) {
-
-      formData.put("business_entity_id", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder mandatoryItemsToRemove(List<String> value) {
-
-      formData.put("mandatory_items_to_remove", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder cancelUrl(String value) {
-
-      formData.put("cancel_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder passThruContent(String value) {
-
-      formData.put("pass_thru_content", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder allowOfflinePaymentMethods(Boolean value) {
-
-      formData.put("allow_offline_payment_methods", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsBuilder entityIdentifiers(
-        List<EntityIdentifiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EntityIdentifiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "entity_identifiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewForItemsParams build() {
-      return new HostedPageCheckoutNewForItemsParams(this);
-    }
-  }
-
-  public enum Layout {
-    IN_APP("in_app"),
-
-    FULL_PAGE("full_page"),
-
-    /** An enum member indicating that Layout was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Layout(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Layout fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Layout enumValue : Layout.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder coupon(String value) {
-
-        formData.put("coupon", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder autoCollection(AutoCollection value) {
-
-        formData.put("auto_collection", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder invoiceNotes(String value) {
-
-        formData.put("invoice_notes", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder poNumber(String value) {
-
-        formData.put("po_number", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum AutoCollection {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AutoCollection(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AutoCollection fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AutoCollection enumValue : AutoCollection.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public CustomerBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public CustomerBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public CustomerBuilder locale(String value) {
-
-        formData.put("locale", value);
-
-        return this;
-      }
-
-      public CustomerBuilder taxability(Taxability value) {
-
-        formData.put("taxability", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder isEinvoiceEnabled(Boolean value) {
-
-        formData.put("is_einvoice_enabled", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityIdentifierScheme(String value) {
-
-        formData.put("entity_identifier_scheme", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityIdentifierStandard(String value) {
-
-        formData.put("entity_identifier_standard", value);
-
-        return this;
-      }
-
-      public CustomerBuilder einvoicingMethod(EinvoicingMethod value) {
-
-        formData.put("einvoicing_method", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-
-    public enum Taxability {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Taxability was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Taxability(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Taxability fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Taxability enumValue : Taxability.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum EinvoicingMethod {
-      AUTOMATIC("automatic"),
-
-      MANUAL("manual"),
-
-      SITE_DEFAULT("site_default"),
-
-      /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EinvoicingMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EinvoicingMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class EntityIdentifiersParams {
-
-    private final Map<String, Object> formData;
-
-    private EntityIdentifiersParams(EntityIdentifiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EntityIdentifiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EntityIdentifiersBuilder builder() {
-      return new EntityIdentifiersBuilder();
-    }
-
-    public static final class EntityIdentifiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EntityIdentifiersBuilder() {}
-
-      public EntityIdentifiersBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder scheme(String value) {
-
-        formData.put("scheme", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder operation(Operation value) {
-
-        formData.put("operation", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder standard(String value) {
-
-        formData.put("standard", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersParams build() {
-        return new EntityIdentifiersParams(this);
-      }
-    }
-
-    public enum Operation {
-      CREATE("create"),
-
-      UPDATE("update"),
-
-      DELETE("delete"),
-
-      /** An enum member indicating that Operation was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Operation(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Operation fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Operation enumValue : Operation.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutNewParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutNewParams.java
deleted file mode 100644
index 6149c8fa..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutNewParams.java
+++ /dev/null
@@ -1,1399 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class HostedPageCheckoutNewParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageCheckoutNewParams(HostedPageCheckoutNewBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageCheckoutNewParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageCheckoutNewBuilder builder() {
-    return new HostedPageCheckoutNewBuilder();
-  }
-
-  public static final class HostedPageCheckoutNewBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageCheckoutNewBuilder() {}
-
-    public HostedPageCheckoutNewBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder mandatoryAddonsToRemove(List<String> value) {
-
-      formData.put("mandatory_addons_to_remove", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder cancelUrl(String value) {
-
-      formData.put("cancel_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder passThruContent(String value) {
-
-      formData.put("pass_thru_content", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder embed(Boolean value) {
-
-      formData.put("embed", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder iframeMessaging(Boolean value) {
-
-      formData.put("iframe_messaging", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder allowOfflinePaymentMethods(Boolean value) {
-
-      formData.put("allow_offline_payment_methods", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutNewParams build() {
-      return new HostedPageCheckoutNewParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planId(String value) {
-
-        formData.put("plan_id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantity(Integer value) {
-
-        formData.put("plan_quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantityInDecimal(String value) {
-
-        formData.put("plan_quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPrice(Long value) {
-
-        formData.put("plan_unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
-
-        formData.put("plan_unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder coupon(String value) {
-
-        formData.put("coupon", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder autoCollection(AutoCollection value) {
-
-        formData.put("auto_collection", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder invoiceNotes(String value) {
-
-        formData.put("invoice_notes", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder affiliateToken(String value) {
-
-        formData.put("affiliate_token", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum AutoCollection {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AutoCollection(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AutoCollection fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AutoCollection enumValue : AutoCollection.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public CustomerBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public CustomerBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public CustomerBuilder locale(String value) {
-
-        formData.put("locale", value);
-
-        return this;
-      }
-
-      public CustomerBuilder taxability(Taxability value) {
-
-        formData.put("taxability", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder consolidatedInvoicing(Boolean value) {
-
-        formData.put("consolidated_invoicing", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-
-    public enum Taxability {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Taxability was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Taxability(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Taxability fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Taxability enumValue : Taxability.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
-
-        formData.put("charge_on", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOn {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOn enumValue : ChargeOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutOneTimeForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutOneTimeForItemsParams.java
deleted file mode 100644
index 00e360a3..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutOneTimeForItemsParams.java
+++ /dev/null
@@ -1,1544 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class HostedPageCheckoutOneTimeForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageCheckoutOneTimeForItemsParams(
-      HostedPageCheckoutOneTimeForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageCheckoutOneTimeForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageCheckoutOneTimeForItemsBuilder builder() {
-    return new HostedPageCheckoutOneTimeForItemsBuilder();
-  }
-
-  public static final class HostedPageCheckoutOneTimeForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageCheckoutOneTimeForItemsBuilder() {}
-
-    public HostedPageCheckoutOneTimeForItemsBuilder businessEntityId(String value) {
-
-      formData.put("business_entity_id", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder layout(Layout value) {
-
-      formData.put("layout", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder invoiceNote(String value) {
-
-      formData.put("invoice_note", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public HostedPageCheckoutOneTimeForItemsBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder cancelUrl(String value) {
-
-      formData.put("cancel_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder passThruContent(String value) {
-
-      formData.put("pass_thru_content", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder invoice(InvoiceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "invoice[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder itemPrices(List<ItemPricesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemPricesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_prices[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder charges(List<ChargesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsBuilder entityIdentifiers(
-        List<EntityIdentifiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EntityIdentifiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "entity_identifiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeForItemsParams build() {
-      return new HostedPageCheckoutOneTimeForItemsParams(this);
-    }
-  }
-
-  public enum Layout {
-    IN_APP("in_app"),
-
-    FULL_PAGE("full_page"),
-
-    /** An enum member indicating that Layout was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Layout(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Layout fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Layout enumValue : Layout.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public CustomerBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public CustomerBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public CustomerBuilder locale(String value) {
-
-        formData.put("locale", value);
-
-        return this;
-      }
-
-      public CustomerBuilder taxability(Taxability value) {
-
-        formData.put("taxability", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder einvoicingMethod(EinvoicingMethod value) {
-
-        formData.put("einvoicing_method", value);
-
-        return this;
-      }
-
-      public CustomerBuilder isEinvoiceEnabled(Boolean value) {
-
-        formData.put("is_einvoice_enabled", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityIdentifierScheme(String value) {
-
-        formData.put("entity_identifier_scheme", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityIdentifierStandard(String value) {
-
-        formData.put("entity_identifier_standard", value);
-
-        return this;
-      }
-
-      public CustomerBuilder consolidatedInvoicing(Boolean value) {
-
-        formData.put("consolidated_invoicing", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-
-    public enum Taxability {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Taxability was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Taxability(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Taxability fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Taxability enumValue : Taxability.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum EinvoicingMethod {
-      AUTOMATIC("automatic"),
-
-      MANUAL("manual"),
-
-      SITE_DEFAULT("site_default"),
-
-      /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EinvoicingMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EinvoicingMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class InvoiceParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceParams(InvoiceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceBuilder builder() {
-      return new InvoiceBuilder();
-    }
-
-    public static final class InvoiceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceBuilder() {}
-
-      public InvoiceBuilder poNumber(String value) {
-
-        formData.put("po_number", value);
-
-        return this;
-      }
-
-      public InvoiceParams build() {
-        return new InvoiceParams(this);
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemPricesParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemPricesParams(ItemPricesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemPricesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemPricesBuilder builder() {
-      return new ItemPricesBuilder();
-    }
-
-    public static final class ItemPricesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemPricesBuilder() {}
-
-      public ItemPricesBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ItemPricesParams build() {
-        return new ItemPricesParams(this);
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChargesParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargesParams(ChargesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargesBuilder builder() {
-      return new ChargesBuilder();
-    }
-
-    public static final class ChargesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargesBuilder() {}
-
-      public ChargesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public ChargesBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public ChargesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxable(Boolean value) {
-
-        formData.put("taxable", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxProfileId(String value) {
-
-        formData.put("tax_profile_id", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTaxCode(String value) {
-
-        formData.put("avalara_tax_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder hsnCode(String value) {
-
-        formData.put("hsn_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxjarProductCode(String value) {
-
-        formData.put("taxjar_product_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ChargesParams build() {
-        return new ChargesParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class EntityIdentifiersParams {
-
-    private final Map<String, Object> formData;
-
-    private EntityIdentifiersParams(EntityIdentifiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EntityIdentifiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EntityIdentifiersBuilder builder() {
-      return new EntityIdentifiersBuilder();
-    }
-
-    public static final class EntityIdentifiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EntityIdentifiersBuilder() {}
-
-      public EntityIdentifiersBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder scheme(String value) {
-
-        formData.put("scheme", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder operation(Operation value) {
-
-        formData.put("operation", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder standard(String value) {
-
-        formData.put("standard", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersParams build() {
-        return new EntityIdentifiersParams(this);
-      }
-    }
-
-    public enum Operation {
-      CREATE("create"),
-
-      UPDATE("update"),
-
-      DELETE("delete"),
-
-      /** An enum member indicating that Operation was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Operation(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Operation fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Operation enumValue : Operation.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutOneTimeParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutOneTimeParams.java
deleted file mode 100644
index 0563f072..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCheckoutOneTimeParams.java
+++ /dev/null
@@ -1,1097 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class HostedPageCheckoutOneTimeParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageCheckoutOneTimeParams(HostedPageCheckoutOneTimeBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageCheckoutOneTimeParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageCheckoutOneTimeBuilder builder() {
-    return new HostedPageCheckoutOneTimeBuilder();
-  }
-
-  public static final class HostedPageCheckoutOneTimeBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageCheckoutOneTimeBuilder() {}
-
-    public HostedPageCheckoutOneTimeBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder invoiceNote(String value) {
-
-      formData.put("invoice_note", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public HostedPageCheckoutOneTimeBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder cancelUrl(String value) {
-
-      formData.put("cancel_url", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder passThruContent(String value) {
-
-      formData.put("pass_thru_content", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder embed(Boolean value) {
-
-      formData.put("embed", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder iframeMessaging(Boolean value) {
-
-      formData.put("iframe_messaging", value);
-
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder invoice(InvoiceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "invoice[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeBuilder charges(List<ChargesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCheckoutOneTimeParams build() {
-      return new HostedPageCheckoutOneTimeParams(this);
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public CustomerBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public CustomerBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public CustomerBuilder locale(String value) {
-
-        formData.put("locale", value);
-
-        return this;
-      }
-
-      public CustomerBuilder taxability(Taxability value) {
-
-        formData.put("taxability", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder consolidatedInvoicing(Boolean value) {
-
-        formData.put("consolidated_invoicing", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-
-    public enum Taxability {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Taxability was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Taxability(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Taxability fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Taxability enumValue : Taxability.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class InvoiceParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceParams(InvoiceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceBuilder builder() {
-      return new InvoiceBuilder();
-    }
-
-    public static final class InvoiceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceBuilder() {}
-
-      public InvoiceBuilder poNumber(String value) {
-
-        formData.put("po_number", value);
-
-        return this;
-      }
-
-      public InvoiceParams build() {
-        return new InvoiceParams(this);
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public AddonsBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class ChargesParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargesParams(ChargesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargesBuilder builder() {
-      return new ChargesBuilder();
-    }
-
-    public static final class ChargesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargesBuilder() {}
-
-      public ChargesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public ChargesBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public ChargesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxable(Boolean value) {
-
-        formData.put("taxable", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxProfileId(String value) {
-
-        formData.put("tax_profile_id", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTaxCode(String value) {
-
-        formData.put("avalara_tax_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder hsnCode(String value) {
-
-        formData.put("hsn_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxjarProductCode(String value) {
-
-        formData.put("taxjar_product_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ChargesParams build() {
-        return new ChargesParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageClaimGiftParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageClaimGiftParams.java
deleted file mode 100644
index 3568f24d..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageClaimGiftParams.java
+++ /dev/null
@@ -1,146 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class HostedPageClaimGiftParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageClaimGiftParams(HostedPageClaimGiftBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageClaimGiftParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageClaimGiftBuilder builder() {
-    return new HostedPageClaimGiftBuilder();
-  }
-
-  public static final class HostedPageClaimGiftBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageClaimGiftBuilder() {}
-
-    public HostedPageClaimGiftBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageClaimGiftBuilder gift(GiftParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "gift[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageClaimGiftBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageClaimGiftParams build() {
-      return new HostedPageClaimGiftParams(this);
-    }
-  }
-
-  public static final class GiftParams {
-
-    private final Map<String, Object> formData;
-
-    private GiftParams(GiftBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GiftParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GiftBuilder builder() {
-      return new GiftBuilder();
-    }
-
-    public static final class GiftBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GiftBuilder() {}
-
-      public GiftBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public GiftParams build() {
-        return new GiftParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder locale(String value) {
-
-        formData.put("locale", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCollectNowParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCollectNowParams.java
deleted file mode 100644
index 62317455..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageCollectNowParams.java
+++ /dev/null
@@ -1,293 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class HostedPageCollectNowParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageCollectNowParams(HostedPageCollectNowBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageCollectNowParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageCollectNowBuilder builder() {
-    return new HostedPageCollectNowBuilder();
-  }
-
-  public static final class HostedPageCollectNowBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageCollectNowBuilder() {}
-
-    public HostedPageCollectNowBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageCollectNowBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public HostedPageCollectNowBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCollectNowBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageCollectNowParams build() {
-      return new HostedPageCollectNowParams(this);
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageEventsParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageEventsParams.java
deleted file mode 100644
index 1384de64..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageEventsParams.java
+++ /dev/null
@@ -1,92 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class HostedPageEventsParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageEventsParams(HostedPageEventsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageEventsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageEventsBuilder builder() {
-    return new HostedPageEventsBuilder();
-  }
-
-  public static final class HostedPageEventsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageEventsBuilder() {}
-
-    public HostedPageEventsBuilder eventName(EventName value) {
-
-      formData.put("event_name", value);
-
-      return this;
-    }
-
-    public HostedPageEventsBuilder occurredAt(Timestamp value) {
-
-      formData.put("occurred_at", value);
-
-      return this;
-    }
-
-    public HostedPageEventsBuilder eventData(java.util.Map<String, Object> value) {
-
-      formData.put("event_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public HostedPageEventsParams build() {
-      return new HostedPageEventsParams(this);
-    }
-  }
-
-  public enum EventName {
-    CANCELLATION_PAGE_LOADED("cancellation_page_loaded"),
-
-    /** An enum member indicating that EventName was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    EventName(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static EventName fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (EventName enumValue : EventName.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageExtendSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageExtendSubscriptionParams.java
deleted file mode 100644
index 42eba194..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageExtendSubscriptionParams.java
+++ /dev/null
@@ -1,105 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class HostedPageExtendSubscriptionParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageExtendSubscriptionParams(HostedPageExtendSubscriptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageExtendSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageExtendSubscriptionBuilder builder() {
-    return new HostedPageExtendSubscriptionBuilder();
-  }
-
-  public static final class HostedPageExtendSubscriptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageExtendSubscriptionBuilder() {}
-
-    public HostedPageExtendSubscriptionBuilder expiry(Integer value) {
-
-      formData.put("expiry", value);
-
-      return this;
-    }
-
-    public HostedPageExtendSubscriptionBuilder billingCycle(Integer value) {
-
-      formData.put("billing_cycle", value);
-
-      return this;
-    }
-
-    public HostedPageExtendSubscriptionBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageExtendSubscriptionParams build() {
-      return new HostedPageExtendSubscriptionParams(this);
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageManagePaymentSourcesParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageManagePaymentSourcesParams.java
deleted file mode 100644
index 878af052..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageManagePaymentSourcesParams.java
+++ /dev/null
@@ -1,286 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class HostedPageManagePaymentSourcesParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageManagePaymentSourcesParams(HostedPageManagePaymentSourcesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageManagePaymentSourcesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageManagePaymentSourcesBuilder builder() {
-    return new HostedPageManagePaymentSourcesBuilder();
-  }
-
-  public static final class HostedPageManagePaymentSourcesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageManagePaymentSourcesBuilder() {}
-
-    public HostedPageManagePaymentSourcesBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageManagePaymentSourcesBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageManagePaymentSourcesBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageManagePaymentSourcesParams build() {
-      return new HostedPageManagePaymentSourcesParams(this);
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPagePreCancelParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPagePreCancelParams.java
deleted file mode 100644
index c807d26c..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPagePreCancelParams.java
+++ /dev/null
@@ -1,112 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class HostedPagePreCancelParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPagePreCancelParams(HostedPagePreCancelBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPagePreCancelParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPagePreCancelBuilder builder() {
-    return new HostedPagePreCancelBuilder();
-  }
-
-  public static final class HostedPagePreCancelBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPagePreCancelBuilder() {}
-
-    public HostedPagePreCancelBuilder passThruContent(String value) {
-
-      formData.put("pass_thru_content", value);
-
-      return this;
-    }
-
-    public HostedPagePreCancelBuilder cancelUrl(String value) {
-
-      formData.put("cancel_url", value);
-
-      return this;
-    }
-
-    public HostedPagePreCancelBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPagePreCancelBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPagePreCancelParams build() {
-      return new HostedPagePreCancelParams(this);
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageRetrieveAgreementPdfParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageRetrieveAgreementPdfParams.java
deleted file mode 100644
index 3f3b61c5..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageRetrieveAgreementPdfParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class HostedPageRetrieveAgreementPdfParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageRetrieveAgreementPdfParams(HostedPageRetrieveAgreementPdfBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageRetrieveAgreementPdfParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageRetrieveAgreementPdfBuilder builder() {
-    return new HostedPageRetrieveAgreementPdfBuilder();
-  }
-
-  public static final class HostedPageRetrieveAgreementPdfBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageRetrieveAgreementPdfBuilder() {}
-
-    public HostedPageRetrieveAgreementPdfBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public HostedPageRetrieveAgreementPdfParams build() {
-      return new HostedPageRetrieveAgreementPdfParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageUpdateCardParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageUpdateCardParams.java
deleted file mode 100644
index 6d60f6be..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageUpdateCardParams.java
+++ /dev/null
@@ -1,330 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class HostedPageUpdateCardParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageUpdateCardParams(HostedPageUpdateCardBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageUpdateCardParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageUpdateCardBuilder builder() {
-    return new HostedPageUpdateCardBuilder();
-  }
-
-  public static final class HostedPageUpdateCardBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageUpdateCardBuilder() {}
-
-    public HostedPageUpdateCardBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageUpdateCardBuilder cancelUrl(String value) {
-
-      formData.put("cancel_url", value);
-
-      return this;
-    }
-
-    public HostedPageUpdateCardBuilder passThruContent(String value) {
-
-      formData.put("pass_thru_content", value);
-
-      return this;
-    }
-
-    public HostedPageUpdateCardBuilder iframeMessaging(Boolean value) {
-
-      formData.put("iframe_messaging", value);
-
-      return this;
-    }
-
-    public HostedPageUpdateCardBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageUpdateCardBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageUpdateCardBuilder embed(Boolean value) {
-
-      formData.put("embed", value);
-
-      return this;
-    }
-
-    public HostedPageUpdateCardParams build() {
-      return new HostedPageUpdateCardParams(this);
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageUpdatePaymentMethodParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageUpdatePaymentMethodParams.java
deleted file mode 100644
index d372ef6f..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageUpdatePaymentMethodParams.java
+++ /dev/null
@@ -1,330 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class HostedPageUpdatePaymentMethodParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageUpdatePaymentMethodParams(HostedPageUpdatePaymentMethodBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageUpdatePaymentMethodParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageUpdatePaymentMethodBuilder builder() {
-    return new HostedPageUpdatePaymentMethodBuilder();
-  }
-
-  public static final class HostedPageUpdatePaymentMethodBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageUpdatePaymentMethodBuilder() {}
-
-    public HostedPageUpdatePaymentMethodBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public HostedPageUpdatePaymentMethodBuilder cancelUrl(String value) {
-
-      formData.put("cancel_url", value);
-
-      return this;
-    }
-
-    public HostedPageUpdatePaymentMethodBuilder passThruContent(String value) {
-
-      formData.put("pass_thru_content", value);
-
-      return this;
-    }
-
-    public HostedPageUpdatePaymentMethodBuilder iframeMessaging(Boolean value) {
-
-      formData.put("iframe_messaging", value);
-
-      return this;
-    }
-
-    public HostedPageUpdatePaymentMethodBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageUpdatePaymentMethodBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageUpdatePaymentMethodBuilder embed(Boolean value) {
-
-      formData.put("embed", value);
-
-      return this;
-    }
-
-    public HostedPageUpdatePaymentMethodParams build() {
-      return new HostedPageUpdatePaymentMethodParams(this);
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageViewVoucherParams.java b/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageViewVoucherParams.java
deleted file mode 100644
index ffe92703..00000000
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageViewVoucherParams.java
+++ /dev/null
@@ -1,139 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.hostedPage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class HostedPageViewVoucherParams {
-
-  private final Map<String, Object> formData;
-
-  private HostedPageViewVoucherParams(HostedPageViewVoucherBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for HostedPageViewVoucherParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static HostedPageViewVoucherBuilder builder() {
-    return new HostedPageViewVoucherBuilder();
-  }
-
-  public static final class HostedPageViewVoucherBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private HostedPageViewVoucherBuilder() {}
-
-    public HostedPageViewVoucherBuilder paymentVoucher(PaymentVoucherParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_voucher[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageViewVoucherBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public HostedPageViewVoucherParams build() {
-      return new HostedPageViewVoucherParams(this);
-    }
-  }
-
-  public static final class PaymentVoucherParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentVoucherParams(PaymentVoucherBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentVoucherParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentVoucherBuilder builder() {
-      return new PaymentVoucherBuilder();
-    }
-
-    public static final class PaymentVoucherBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentVoucherBuilder() {}
-
-      public PaymentVoucherBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentVoucherParams build() {
-        return new PaymentVoucherParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder locale(String value) {
-
-        formData.put("locale", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/inAppSubscription/params/InAppSubscriptionImportReceiptParams.java b/src/main/java/com/chargebee/v4/core/models/inAppSubscription/params/InAppSubscriptionImportReceiptParams.java
deleted file mode 100644
index 230fbad5..00000000
--- a/src/main/java/com/chargebee/v4/core/models/inAppSubscription/params/InAppSubscriptionImportReceiptParams.java
+++ /dev/null
@@ -1,153 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.inAppSubscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InAppSubscriptionImportReceiptParams {
-
-  private final Map<String, Object> formData;
-
-  private InAppSubscriptionImportReceiptParams(InAppSubscriptionImportReceiptBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InAppSubscriptionImportReceiptParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InAppSubscriptionImportReceiptBuilder builder() {
-    return new InAppSubscriptionImportReceiptBuilder();
-  }
-
-  public static final class InAppSubscriptionImportReceiptBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InAppSubscriptionImportReceiptBuilder() {}
-
-    public InAppSubscriptionImportReceiptBuilder receipt(String value) {
-
-      formData.put("receipt", value);
-
-      return this;
-    }
-
-    public InAppSubscriptionImportReceiptBuilder product(ProductParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "product[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InAppSubscriptionImportReceiptBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InAppSubscriptionImportReceiptParams build() {
-      return new InAppSubscriptionImportReceiptParams(this);
-    }
-  }
-
-  public static final class ProductParams {
-
-    private final Map<String, Object> formData;
-
-    private ProductParams(ProductBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ProductParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ProductBuilder builder() {
-      return new ProductBuilder();
-    }
-
-    public static final class ProductBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ProductBuilder() {}
-
-      public ProductBuilder currencyCode(String value) {
-
-        formData.put("currency_code", value);
-
-        return this;
-      }
-
-      public ProductParams build() {
-        return new ProductParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/inAppSubscription/params/InAppSubscriptionImportSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/inAppSubscription/params/InAppSubscriptionImportSubscriptionParams.java
deleted file mode 100644
index f61e5f43..00000000
--- a/src/main/java/com/chargebee/v4/core/models/inAppSubscription/params/InAppSubscriptionImportSubscriptionParams.java
+++ /dev/null
@@ -1,197 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.inAppSubscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class InAppSubscriptionImportSubscriptionParams {
-
-  private final Map<String, Object> formData;
-
-  private InAppSubscriptionImportSubscriptionParams(
-      InAppSubscriptionImportSubscriptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InAppSubscriptionImportSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InAppSubscriptionImportSubscriptionBuilder builder() {
-    return new InAppSubscriptionImportSubscriptionBuilder();
-  }
-
-  public static final class InAppSubscriptionImportSubscriptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InAppSubscriptionImportSubscriptionBuilder() {}
-
-    public InAppSubscriptionImportSubscriptionBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InAppSubscriptionImportSubscriptionBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InAppSubscriptionImportSubscriptionParams build() {
-      return new InAppSubscriptionImportSubscriptionParams(this);
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startedAt(Timestamp value) {
-
-        formData.put("started_at", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder termStart(Timestamp value) {
-
-        formData.put("term_start", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder termEnd(Timestamp value) {
-
-        formData.put("term_end", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder productId(String value) {
-
-        formData.put("product_id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder currencyCode(String value) {
-
-        formData.put("currency_code", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder transactionId(String value) {
-
-        formData.put("transaction_id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder isTrial(Boolean value) {
-
-        formData.put("is_trial", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/inAppSubscription/params/InAppSubscriptionProcessReceiptParams.java b/src/main/java/com/chargebee/v4/core/models/inAppSubscription/params/InAppSubscriptionProcessReceiptParams.java
deleted file mode 100644
index b9dce9aa..00000000
--- a/src/main/java/com/chargebee/v4/core/models/inAppSubscription/params/InAppSubscriptionProcessReceiptParams.java
+++ /dev/null
@@ -1,209 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.inAppSubscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InAppSubscriptionProcessReceiptParams {
-
-  private final Map<String, Object> formData;
-
-  private InAppSubscriptionProcessReceiptParams(InAppSubscriptionProcessReceiptBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InAppSubscriptionProcessReceiptParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InAppSubscriptionProcessReceiptBuilder builder() {
-    return new InAppSubscriptionProcessReceiptBuilder();
-  }
-
-  public static final class InAppSubscriptionProcessReceiptBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InAppSubscriptionProcessReceiptBuilder() {}
-
-    public InAppSubscriptionProcessReceiptBuilder receipt(String value) {
-
-      formData.put("receipt", value);
-
-      return this;
-    }
-
-    public InAppSubscriptionProcessReceiptBuilder product(ProductParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "product[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InAppSubscriptionProcessReceiptBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InAppSubscriptionProcessReceiptParams build() {
-      return new InAppSubscriptionProcessReceiptParams(this);
-    }
-  }
-
-  public static final class ProductParams {
-
-    private final Map<String, Object> formData;
-
-    private ProductParams(ProductBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ProductParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ProductBuilder builder() {
-      return new ProductBuilder();
-    }
-
-    public static final class ProductBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ProductBuilder() {}
-
-      public ProductBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public ProductBuilder currencyCode(String value) {
-
-        formData.put("currency_code", value);
-
-        return this;
-      }
-
-      public ProductBuilder price(Integer value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ProductBuilder name(String value) {
-
-        formData.put("name", value);
-
-        return this;
-      }
-
-      public ProductBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ProductBuilder period(String value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public ProductBuilder periodUnit(String value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public ProductParams build() {
-        return new ProductParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public CustomerBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/inAppSubscription/params/InAppSubscriptionRetrieveStoreSubsParams.java b/src/main/java/com/chargebee/v4/core/models/inAppSubscription/params/InAppSubscriptionRetrieveStoreSubsParams.java
deleted file mode 100644
index 1276aa7a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/inAppSubscription/params/InAppSubscriptionRetrieveStoreSubsParams.java
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.inAppSubscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InAppSubscriptionRetrieveStoreSubsParams {
-
-  private final Map<String, Object> formData;
-
-  private InAppSubscriptionRetrieveStoreSubsParams(
-      InAppSubscriptionRetrieveStoreSubsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InAppSubscriptionRetrieveStoreSubsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InAppSubscriptionRetrieveStoreSubsBuilder builder() {
-    return new InAppSubscriptionRetrieveStoreSubsBuilder();
-  }
-
-  public static final class InAppSubscriptionRetrieveStoreSubsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InAppSubscriptionRetrieveStoreSubsBuilder() {}
-
-    public InAppSubscriptionRetrieveStoreSubsBuilder receipt(String value) {
-
-      formData.put("receipt", value);
-
-      return this;
-    }
-
-    public InAppSubscriptionRetrieveStoreSubsParams build() {
-      return new InAppSubscriptionRetrieveStoreSubsParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceAddAddonChargeParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceAddAddonChargeParams.java
deleted file mode 100644
index f67b61cd..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceAddAddonChargeParams.java
+++ /dev/null
@@ -1,148 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class InvoiceAddAddonChargeParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceAddAddonChargeParams(InvoiceAddAddonChargeBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceAddAddonChargeParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceAddAddonChargeBuilder builder() {
-    return new InvoiceAddAddonChargeBuilder();
-  }
-
-  public static final class InvoiceAddAddonChargeBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceAddAddonChargeBuilder() {}
-
-    public InvoiceAddAddonChargeBuilder addonId(String value) {
-
-      formData.put("addon_id", value);
-
-      return this;
-    }
-
-    public InvoiceAddAddonChargeBuilder addonQuantity(Integer value) {
-
-      formData.put("addon_quantity", value);
-
-      return this;
-    }
-
-    public InvoiceAddAddonChargeBuilder addonUnitPrice(Long value) {
-
-      formData.put("addon_unit_price", value);
-
-      return this;
-    }
-
-    public InvoiceAddAddonChargeBuilder addonQuantityInDecimal(String value) {
-
-      formData.put("addon_quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public InvoiceAddAddonChargeBuilder addonUnitPriceInDecimal(String value) {
-
-      formData.put("addon_unit_price_in_decimal", value);
-
-      return this;
-    }
-
-    public InvoiceAddAddonChargeBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceAddAddonChargeBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public InvoiceAddAddonChargeBuilder lineItem(LineItemParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "line_item[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceAddAddonChargeParams build() {
-      return new InvoiceAddAddonChargeParams(this);
-    }
-  }
-
-  public static final class LineItemParams {
-
-    private final Map<String, Object> formData;
-
-    private LineItemParams(LineItemBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LineItemParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LineItemBuilder builder() {
-      return new LineItemBuilder();
-    }
-
-    public static final class LineItemBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LineItemBuilder() {}
-
-      public LineItemBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public LineItemBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public LineItemParams build() {
-        return new LineItemParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceAddChargeItemParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceAddChargeItemParams.java
deleted file mode 100644
index 31e9f9e1..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceAddChargeItemParams.java
+++ /dev/null
@@ -1,281 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class InvoiceAddChargeItemParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceAddChargeItemParams(InvoiceAddChargeItemBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceAddChargeItemParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceAddChargeItemBuilder builder() {
-    return new InvoiceAddChargeItemBuilder();
-  }
-
-  public static final class InvoiceAddChargeItemBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceAddChargeItemBuilder() {}
-
-    public InvoiceAddChargeItemBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceAddChargeItemBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public InvoiceAddChargeItemBuilder itemPrice(ItemPriceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_price[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceAddChargeItemBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceAddChargeItemParams build() {
-      return new InvoiceAddChargeItemParams(this);
-    }
-  }
-
-  public static final class ItemPriceParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemPriceParams(ItemPriceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemPriceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemPriceBuilder builder() {
-      return new ItemPriceBuilder();
-    }
-
-    public static final class ItemPriceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemPriceBuilder() {}
-
-      public ItemPriceBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemPriceBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public ItemPriceBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPriceBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public ItemPriceBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPriceBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ItemPriceBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ItemPriceParams build() {
-        return new ItemPriceParams(this);
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceAddChargeParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceAddChargeParams.java
deleted file mode 100644
index d80c8295..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceAddChargeParams.java
+++ /dev/null
@@ -1,201 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class InvoiceAddChargeParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceAddChargeParams(InvoiceAddChargeBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceAddChargeParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceAddChargeBuilder builder() {
-    return new InvoiceAddChargeBuilder();
-  }
-
-  public static final class InvoiceAddChargeBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceAddChargeBuilder() {}
-
-    public InvoiceAddChargeBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public InvoiceAddChargeBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public InvoiceAddChargeBuilder avalaraSaleType(AvalaraSaleType value) {
-
-      formData.put("avalara_sale_type", value);
-
-      return this;
-    }
-
-    public InvoiceAddChargeBuilder avalaraTransactionType(Integer value) {
-
-      formData.put("avalara_transaction_type", value);
-
-      return this;
-    }
-
-    public InvoiceAddChargeBuilder avalaraServiceType(Integer value) {
-
-      formData.put("avalara_service_type", value);
-
-      return this;
-    }
-
-    public InvoiceAddChargeBuilder avalaraTaxCode(String value) {
-
-      formData.put("avalara_tax_code", value);
-
-      return this;
-    }
-
-    public InvoiceAddChargeBuilder hsnCode(String value) {
-
-      formData.put("hsn_code", value);
-
-      return this;
-    }
-
-    public InvoiceAddChargeBuilder taxjarProductCode(String value) {
-
-      formData.put("taxjar_product_code", value);
-
-      return this;
-    }
-
-    public InvoiceAddChargeBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceAddChargeBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public InvoiceAddChargeBuilder lineItem(LineItemParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "line_item[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceAddChargeParams build() {
-      return new InvoiceAddChargeParams(this);
-    }
-  }
-
-  public enum AvalaraSaleType {
-    WHOLESALE("wholesale"),
-
-    RETAIL("retail"),
-
-    CONSUMED("consumed"),
-
-    VENDOR_USE("vendor_use"),
-
-    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AvalaraSaleType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AvalaraSaleType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class LineItemParams {
-
-    private final Map<String, Object> formData;
-
-    private LineItemParams(LineItemBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LineItemParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LineItemBuilder builder() {
-      return new LineItemBuilder();
-    }
-
-    public static final class LineItemBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LineItemBuilder() {}
-
-      public LineItemBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public LineItemBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public LineItemParams build() {
-        return new LineItemParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceApplyCreditsParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceApplyCreditsParams.java
deleted file mode 100644
index 54c5e5b9..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceApplyCreditsParams.java
+++ /dev/null
@@ -1,104 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class InvoiceApplyCreditsParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceApplyCreditsParams(InvoiceApplyCreditsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceApplyCreditsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceApplyCreditsBuilder builder() {
-    return new InvoiceApplyCreditsBuilder();
-  }
-
-  public static final class InvoiceApplyCreditsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceApplyCreditsBuilder() {}
-
-    public InvoiceApplyCreditsBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceApplyCreditsBuilder creditNotes(List<CreditNotesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CreditNotesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "credit_notes[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceApplyCreditsParams build() {
-      return new InvoiceApplyCreditsParams(this);
-    }
-  }
-
-  public static final class CreditNotesParams {
-
-    private final Map<String, Object> formData;
-
-    private CreditNotesParams(CreditNotesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreditNotesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreditNotesBuilder builder() {
-      return new CreditNotesBuilder();
-    }
-
-    public static final class CreditNotesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreditNotesBuilder() {}
-
-      public CreditNotesBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CreditNotesParams build() {
-        return new CreditNotesParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceApplyPaymentScheduleSchemeParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceApplyPaymentScheduleSchemeParams.java
deleted file mode 100644
index e5236383..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceApplyPaymentScheduleSchemeParams.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceApplyPaymentScheduleSchemeParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceApplyPaymentScheduleSchemeParams(
-      InvoiceApplyPaymentScheduleSchemeBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceApplyPaymentScheduleSchemeParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceApplyPaymentScheduleSchemeBuilder builder() {
-    return new InvoiceApplyPaymentScheduleSchemeBuilder();
-  }
-
-  public static final class InvoiceApplyPaymentScheduleSchemeBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceApplyPaymentScheduleSchemeBuilder() {}
-
-    public InvoiceApplyPaymentScheduleSchemeBuilder schemeId(String value) {
-
-      formData.put("scheme_id", value);
-
-      return this;
-    }
-
-    public InvoiceApplyPaymentScheduleSchemeBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public InvoiceApplyPaymentScheduleSchemeParams build() {
-      return new InvoiceApplyPaymentScheduleSchemeParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceApplyPaymentsParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceApplyPaymentsParams.java
deleted file mode 100644
index d66ed693..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceApplyPaymentsParams.java
+++ /dev/null
@@ -1,111 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class InvoiceApplyPaymentsParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceApplyPaymentsParams(InvoiceApplyPaymentsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceApplyPaymentsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceApplyPaymentsBuilder builder() {
-    return new InvoiceApplyPaymentsBuilder();
-  }
-
-  public static final class InvoiceApplyPaymentsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceApplyPaymentsBuilder() {}
-
-    public InvoiceApplyPaymentsBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceApplyPaymentsBuilder transactions(List<TransactionsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TransactionsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "transactions[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceApplyPaymentsParams build() {
-      return new InvoiceApplyPaymentsParams(this);
-    }
-  }
-
-  public static final class TransactionsParams {
-
-    private final Map<String, Object> formData;
-
-    private TransactionsParams(TransactionsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TransactionsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TransactionsBuilder builder() {
-      return new TransactionsBuilder();
-    }
-
-    public static final class TransactionsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TransactionsBuilder() {}
-
-      public TransactionsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public TransactionsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public TransactionsParams build() {
-        return new TransactionsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceChargeAddonParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceChargeAddonParams.java
deleted file mode 100644
index 47b6c6c4..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceChargeAddonParams.java
+++ /dev/null
@@ -1,179 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class InvoiceChargeAddonParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceChargeAddonParams(InvoiceChargeAddonBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceChargeAddonParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceChargeAddonBuilder builder() {
-    return new InvoiceChargeAddonBuilder();
-  }
-
-  public static final class InvoiceChargeAddonBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceChargeAddonBuilder() {}
-
-    public InvoiceChargeAddonBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonBuilder addonId(String value) {
-
-      formData.put("addon_id", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonBuilder addonQuantity(Integer value) {
-
-      formData.put("addon_quantity", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonBuilder addonUnitPrice(Long value) {
-
-      formData.put("addon_unit_price", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonBuilder addonQuantityInDecimal(String value) {
-
-      formData.put("addon_quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonBuilder addonUnitPriceInDecimal(String value) {
-
-      formData.put("addon_unit_price_in_decimal", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonBuilder dateFrom(Timestamp value) {
-
-      formData.put("date_from", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonBuilder dateTo(Timestamp value) {
-
-      formData.put("date_to", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public InvoiceChargeAddonBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonBuilder paymentInitiator(PaymentInitiator value) {
-
-      formData.put("payment_initiator", value);
-
-      return this;
-    }
-
-    public InvoiceChargeAddonParams build() {
-      return new InvoiceChargeAddonParams(this);
-    }
-  }
-
-  public enum PaymentInitiator {
-    CUSTOMER("customer"),
-
-    MERCHANT("merchant"),
-
-    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentInitiator(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentInitiator fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceChargeParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceChargeParams.java
deleted file mode 100644
index 9e0169b9..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceChargeParams.java
+++ /dev/null
@@ -1,292 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class InvoiceChargeParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceChargeParams(InvoiceChargeBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceChargeParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceChargeBuilder builder() {
-    return new InvoiceChargeBuilder();
-  }
-
-  public static final class InvoiceChargeBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceChargeBuilder() {}
-
-    public InvoiceChargeBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder amountInDecimal(String value) {
-
-      formData.put("amount_in_decimal", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder dateFrom(Timestamp value) {
-
-      formData.put("date_from", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder dateTo(Timestamp value) {
-
-      formData.put("date_to", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public InvoiceChargeBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder avalaraSaleType(AvalaraSaleType value) {
-
-      formData.put("avalara_sale_type", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder avalaraTransactionType(Integer value) {
-
-      formData.put("avalara_transaction_type", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder avalaraServiceType(Integer value) {
-
-      formData.put("avalara_service_type", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder paymentInitiator(PaymentInitiator value) {
-
-      formData.put("payment_initiator", value);
-
-      return this;
-    }
-
-    public InvoiceChargeBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceChargeParams build() {
-      return new InvoiceChargeParams(this);
-    }
-  }
-
-  public enum AvalaraSaleType {
-    WHOLESALE("wholesale"),
-
-    RETAIL("retail"),
-
-    CONSUMED("consumed"),
-
-    VENDOR_USE("vendor_use"),
-
-    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AvalaraSaleType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AvalaraSaleType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PaymentInitiator {
-    CUSTOMER("customer"),
-
-    MERCHANT("merchant"),
-
-    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentInitiator(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentInitiator fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCloseParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCloseParams.java
deleted file mode 100644
index 9b19aae1..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCloseParams.java
+++ /dev/null
@@ -1,209 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class InvoiceCloseParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceCloseParams(InvoiceCloseBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceCloseParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceCloseBuilder builder() {
-    return new InvoiceCloseBuilder();
-  }
-
-  public static final class InvoiceCloseBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceCloseBuilder() {}
-
-    public InvoiceCloseBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceCloseBuilder invoiceNote(String value) {
-
-      formData.put("invoice_note", value);
-
-      return this;
-    }
-
-    public InvoiceCloseBuilder removeGeneralNote(Boolean value) {
-
-      formData.put("remove_general_note", value);
-
-      return this;
-    }
-
-    public InvoiceCloseBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public InvoiceCloseBuilder notesToRemove(List<NotesToRemoveParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          NotesToRemoveParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "notes_to_remove[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public InvoiceCloseBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public InvoiceCloseBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCloseParams build() {
-      return new InvoiceCloseParams(this);
-    }
-  }
-
-  public static final class NotesToRemoveParams {
-
-    private final Map<String, Object> formData;
-
-    private NotesToRemoveParams(NotesToRemoveBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NotesToRemoveParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NotesToRemoveBuilder builder() {
-      return new NotesToRemoveBuilder();
-    }
-
-    public static final class NotesToRemoveBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NotesToRemoveBuilder() {}
-
-      public NotesToRemoveBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public NotesToRemoveBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public NotesToRemoveParams build() {
-        return new NotesToRemoveParams(this);
-      }
-    }
-
-    public enum EntityType {
-      CUSTOMER("customer"),
-
-      SUBSCRIPTION("subscription"),
-
-      COUPON("coupon"),
-
-      PLAN_ITEM_PRICE("plan_item_price"),
-
-      ADDON_ITEM_PRICE("addon_item_price"),
-
-      CHARGE_ITEM_PRICE("charge_item_price"),
-
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCollectPaymentParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCollectPaymentParams.java
deleted file mode 100644
index 8d733020..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCollectPaymentParams.java
+++ /dev/null
@@ -1,106 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceCollectPaymentParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceCollectPaymentParams(InvoiceCollectPaymentBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceCollectPaymentParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceCollectPaymentBuilder builder() {
-    return new InvoiceCollectPaymentBuilder();
-  }
-
-  public static final class InvoiceCollectPaymentBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceCollectPaymentBuilder() {}
-
-    public InvoiceCollectPaymentBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public InvoiceCollectPaymentBuilder authorizationTransactionId(String value) {
-
-      formData.put("authorization_transaction_id", value);
-
-      return this;
-    }
-
-    public InvoiceCollectPaymentBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public InvoiceCollectPaymentBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceCollectPaymentBuilder paymentInitiator(PaymentInitiator value) {
-
-      formData.put("payment_initiator", value);
-
-      return this;
-    }
-
-    public InvoiceCollectPaymentParams build() {
-      return new InvoiceCollectPaymentParams(this);
-    }
-  }
-
-  public enum PaymentInitiator {
-    CUSTOMER("customer"),
-
-    MERCHANT("merchant"),
-
-    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentInitiator(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentInitiator fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCreateForChargeItemParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCreateForChargeItemParams.java
deleted file mode 100644
index d2780371..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCreateForChargeItemParams.java
+++ /dev/null
@@ -1,344 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class InvoiceCreateForChargeItemParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceCreateForChargeItemParams(InvoiceCreateForChargeItemBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceCreateForChargeItemParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceCreateForChargeItemBuilder builder() {
-    return new InvoiceCreateForChargeItemBuilder();
-  }
-
-  public static final class InvoiceCreateForChargeItemBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceCreateForChargeItemBuilder() {}
-
-    public InvoiceCreateForChargeItemBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemBuilder paymentInitiator(PaymentInitiator value) {
-
-      formData.put("payment_initiator", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemBuilder itemPrice(ItemPriceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "item_price[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemParams build() {
-      return new InvoiceCreateForChargeItemParams(this);
-    }
-  }
-
-  public enum PaymentInitiator {
-    CUSTOMER("customer"),
-
-    MERCHANT("merchant"),
-
-    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentInitiator(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentInitiator fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ItemPriceParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemPriceParams(ItemPriceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemPriceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemPriceBuilder builder() {
-      return new ItemPriceBuilder();
-    }
-
-    public static final class ItemPriceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemPriceBuilder() {}
-
-      public ItemPriceBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemPriceBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public ItemPriceBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPriceBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public ItemPriceBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPriceBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ItemPriceBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ItemPriceParams build() {
-        return new ItemPriceParams(this);
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCreateForChargeItemsAndChargesParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCreateForChargeItemsAndChargesParams.java
deleted file mode 100644
index fc011d44..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCreateForChargeItemsAndChargesParams.java
+++ /dev/null
@@ -1,2199 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class InvoiceCreateForChargeItemsAndChargesParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceCreateForChargeItemsAndChargesParams(
-      InvoiceCreateForChargeItemsAndChargesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceCreateForChargeItemsAndChargesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceCreateForChargeItemsAndChargesBuilder builder() {
-    return new InvoiceCreateForChargeItemsAndChargesBuilder();
-  }
-
-  public static final class InvoiceCreateForChargeItemsAndChargesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceCreateForChargeItemsAndChargesBuilder() {}
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder invoiceNote(String value) {
-
-      formData.put("invoice_note", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder removeGeneralNote(Boolean value) {
-
-      formData.put("remove_general_note", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public InvoiceCreateForChargeItemsAndChargesBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder authorizationTransactionId(String value) {
-
-      formData.put("authorization_transaction_id", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder tokenId(String value) {
-
-      formData.put("token_id", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder replacePrimaryPaymentSource(Boolean value) {
-
-      formData.put("replace_primary_payment_source", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder retainPaymentSource(Boolean value) {
-
-      formData.put("retain_payment_source", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder paymentInitiator(PaymentInitiator value) {
-
-      formData.put("payment_initiator", value);
-
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder shippingAddress(
-        ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder statementDescriptor(
-        StatementDescriptorParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder bankAccount(BankAccountParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "bank_account[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder paymentMethod(PaymentMethodParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_method[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder itemPrices(List<ItemPricesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemPricesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_prices[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder charges(List<ChargesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder notesToRemove(
-        List<NotesToRemoveParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          NotesToRemoveParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "notes_to_remove[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder taxProvidersFields(
-        List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public InvoiceCreateForChargeItemsAndChargesBuilder customField(
-        String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public InvoiceCreateForChargeItemsAndChargesBuilder customFields(
-        Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateForChargeItemsAndChargesParams build() {
-      return new InvoiceCreateForChargeItemsAndChargesParams(this);
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PaymentInitiator {
-    CUSTOMER("customer"),
-
-    MERCHANT("merchant"),
-
-    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentInitiator(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentInitiator fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatementDescriptorParams {
-
-    private final Map<String, Object> formData;
-
-    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatementDescriptorParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatementDescriptorBuilder builder() {
-      return new StatementDescriptorBuilder();
-    }
-
-    public static final class StatementDescriptorBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatementDescriptorBuilder() {}
-
-      public StatementDescriptorBuilder descriptor(String value) {
-
-        formData.put("descriptor", value);
-
-        return this;
-      }
-
-      public StatementDescriptorParams build() {
-        return new StatementDescriptorParams(this);
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CardBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public CardBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CardBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CardBuilder number(String value) {
-
-        formData.put("number", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryMonth(Integer value) {
-
-        formData.put("expiry_month", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryYear(Integer value) {
-
-        formData.put("expiry_year", value);
-
-        return this;
-      }
-
-      public CardBuilder cvv(String value) {
-
-        formData.put("cvv", value);
-
-        return this;
-      }
-
-      public CardBuilder preferredScheme(PreferredScheme value) {
-
-        formData.put("preferred_scheme", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr1(String value) {
-
-        formData.put("billing_addr1", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr2(String value) {
-
-        formData.put("billing_addr2", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCity(String value) {
-
-        formData.put("billing_city", value);
-
-        return this;
-      }
-
-      public CardBuilder billingStateCode(String value) {
-
-        formData.put("billing_state_code", value);
-
-        return this;
-      }
-
-      public CardBuilder billingState(String value) {
-
-        formData.put("billing_state", value);
-
-        return this;
-      }
-
-      public CardBuilder billingZip(String value) {
-
-        formData.put("billing_zip", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCountry(String value) {
-
-        formData.put("billing_country", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CardBuilder ipAddress(String value) {
-
-        formData.put("ip_address", value);
-
-        return this;
-      }
-
-      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PreferredScheme {
-      CARTES_BANCAIRES("cartes_bancaires"),
-
-      MASTERCARD("mastercard"),
-
-      VISA("visa"),
-
-      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PreferredScheme(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PreferredScheme fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PreferredScheme enumValue : PreferredScheme.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BankAccountParams {
-
-    private final Map<String, Object> formData;
-
-    private BankAccountParams(BankAccountBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BankAccountParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BankAccountBuilder builder() {
-      return new BankAccountBuilder();
-    }
-
-    public static final class BankAccountBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BankAccountBuilder() {}
-
-      public BankAccountBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder iban(String value) {
-
-        formData.put("iban", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder bankName(String value) {
-
-        formData.put("bank_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountNumber(String value) {
-
-        formData.put("account_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder routingNumber(String value) {
-
-        formData.put("routing_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder bankCode(String value) {
-
-        formData.put("bank_code", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountType(AccountType value) {
-
-        formData.put("account_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountHolderType(AccountHolderType value) {
-
-        formData.put("account_holder_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder echeckType(EcheckType value) {
-
-        formData.put("echeck_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder issuingCountry(String value) {
-
-        formData.put("issuing_country", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder swedishIdentityNumber(String value) {
-
-        formData.put("swedish_identity_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder billingAddress(java.util.Map<String, Object> value) {
-
-        formData.put("billing_address", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public BankAccountParams build() {
-        return new BankAccountParams(this);
-      }
-    }
-
-    public enum AccountType {
-      CHECKING("checking"),
-
-      SAVINGS("savings"),
-
-      BUSINESS_CHECKING("business_checking"),
-
-      CURRENT("current"),
-
-      /** An enum member indicating that AccountType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AccountType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AccountType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AccountType enumValue : AccountType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum AccountHolderType {
-      INDIVIDUAL("individual"),
-
-      COMPANY("company"),
-
-      /**
-       * An enum member indicating that AccountHolderType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      AccountHolderType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AccountHolderType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AccountHolderType enumValue : AccountHolderType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum EcheckType {
-      WEB("web"),
-
-      PPD("ppd"),
-
-      CCD("ccd"),
-
-      /** An enum member indicating that EcheckType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EcheckType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EcheckType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EcheckType enumValue : EcheckType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentMethodParams(PaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentMethodBuilder builder() {
-      return new PaymentMethodBuilder();
-    }
-
-    public static final class PaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentMethodBuilder() {}
-
-      public PaymentMethodBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentMethodBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder issuingCountry(String value) {
-
-        formData.put("issuing_country", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentMethodParams build() {
-        return new PaymentMethodParams(this);
-      }
-    }
-
-    public enum Type {
-      CARD("card"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      GENERIC("generic"),
-
-      ALIPAY("alipay"),
-
-      UNIONPAY("unionpay"),
-
-      APPLE_PAY("apple_pay"),
-
-      WECHAT_PAY("wechat_pay"),
-
-      IDEAL("ideal"),
-
-      GOOGLE_PAY("google_pay"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GIROPAY("giropay"),
-
-      DOTPAY("dotpay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      VENMO("venmo"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      GOCARDLESS("gocardless"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemPricesParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemPricesParams(ItemPricesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemPricesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemPricesBuilder builder() {
-      return new ItemPricesBuilder();
-    }
-
-    public static final class ItemPricesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemPricesBuilder() {}
-
-      public ItemPricesBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ItemPricesParams build() {
-        return new ItemPricesParams(this);
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChargesParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargesParams(ChargesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargesBuilder builder() {
-      return new ChargesBuilder();
-    }
-
-    public static final class ChargesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargesBuilder() {}
-
-      public ChargesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public ChargesBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public ChargesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxable(Boolean value) {
-
-        formData.put("taxable", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxProfileId(String value) {
-
-        formData.put("tax_profile_id", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTaxCode(String value) {
-
-        formData.put("avalara_tax_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder hsnCode(String value) {
-
-        formData.put("hsn_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxjarProductCode(String value) {
-
-        formData.put("taxjar_product_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ChargesParams build() {
-        return new ChargesParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class NotesToRemoveParams {
-
-    private final Map<String, Object> formData;
-
-    private NotesToRemoveParams(NotesToRemoveBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NotesToRemoveParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NotesToRemoveBuilder builder() {
-      return new NotesToRemoveBuilder();
-    }
-
-    public static final class NotesToRemoveBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NotesToRemoveBuilder() {}
-
-      public NotesToRemoveBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public NotesToRemoveBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public NotesToRemoveParams build() {
-        return new NotesToRemoveParams(this);
-      }
-    }
-
-    public enum EntityType {
-      CUSTOMER("customer"),
-
-      SUBSCRIPTION("subscription"),
-
-      COUPON("coupon"),
-
-      PLAN_ITEM_PRICE("plan_item_price"),
-
-      ADDON_ITEM_PRICE("addon_item_price"),
-
-      CHARGE_ITEM_PRICE("charge_item_price"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCreateParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCreateParams.java
deleted file mode 100644
index 25398cd0..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceCreateParams.java
+++ /dev/null
@@ -1,1906 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class InvoiceCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceCreateParams(InvoiceCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceCreateBuilder builder() {
-    return new InvoiceCreateBuilder();
-  }
-
-  public static final class InvoiceCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceCreateBuilder() {}
-
-    public InvoiceCreateBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder invoiceNote(String value) {
-
-      formData.put("invoice_note", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder removeGeneralNote(Boolean value) {
-
-      formData.put("remove_general_note", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public InvoiceCreateBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder authorizationTransactionId(String value) {
-
-      formData.put("authorization_transaction_id", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder tokenId(String value) {
-
-      formData.put("token_id", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder replacePrimaryPaymentSource(Boolean value) {
-
-      formData.put("replace_primary_payment_source", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder retainPaymentSource(Boolean value) {
-
-      formData.put("retain_payment_source", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder paymentInitiator(PaymentInitiator value) {
-
-      formData.put("payment_initiator", value);
-
-      return this;
-    }
-
-    public InvoiceCreateBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateBuilder statementDescriptor(StatementDescriptorParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateBuilder bankAccount(BankAccountParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "bank_account[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateBuilder paymentMethod(PaymentMethodParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_method[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateBuilder charges(List<ChargesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateBuilder notesToRemove(List<NotesToRemoveParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          NotesToRemoveParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "notes_to_remove[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceCreateParams build() {
-      return new InvoiceCreateParams(this);
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PaymentInitiator {
-    CUSTOMER("customer"),
-
-    MERCHANT("merchant"),
-
-    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentInitiator(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentInitiator fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatementDescriptorParams {
-
-    private final Map<String, Object> formData;
-
-    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatementDescriptorParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatementDescriptorBuilder builder() {
-      return new StatementDescriptorBuilder();
-    }
-
-    public static final class StatementDescriptorBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatementDescriptorBuilder() {}
-
-      public StatementDescriptorBuilder descriptor(String value) {
-
-        formData.put("descriptor", value);
-
-        return this;
-      }
-
-      public StatementDescriptorParams build() {
-        return new StatementDescriptorParams(this);
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CardBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public CardBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CardBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CardBuilder number(String value) {
-
-        formData.put("number", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryMonth(Integer value) {
-
-        formData.put("expiry_month", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryYear(Integer value) {
-
-        formData.put("expiry_year", value);
-
-        return this;
-      }
-
-      public CardBuilder cvv(String value) {
-
-        formData.put("cvv", value);
-
-        return this;
-      }
-
-      public CardBuilder preferredScheme(PreferredScheme value) {
-
-        formData.put("preferred_scheme", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr1(String value) {
-
-        formData.put("billing_addr1", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr2(String value) {
-
-        formData.put("billing_addr2", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCity(String value) {
-
-        formData.put("billing_city", value);
-
-        return this;
-      }
-
-      public CardBuilder billingStateCode(String value) {
-
-        formData.put("billing_state_code", value);
-
-        return this;
-      }
-
-      public CardBuilder billingState(String value) {
-
-        formData.put("billing_state", value);
-
-        return this;
-      }
-
-      public CardBuilder billingZip(String value) {
-
-        formData.put("billing_zip", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCountry(String value) {
-
-        formData.put("billing_country", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CardBuilder ipAddress(String value) {
-
-        formData.put("ip_address", value);
-
-        return this;
-      }
-
-      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PreferredScheme {
-      CARTES_BANCAIRES("cartes_bancaires"),
-
-      MASTERCARD("mastercard"),
-
-      VISA("visa"),
-
-      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PreferredScheme(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PreferredScheme fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PreferredScheme enumValue : PreferredScheme.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BankAccountParams {
-
-    private final Map<String, Object> formData;
-
-    private BankAccountParams(BankAccountBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BankAccountParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BankAccountBuilder builder() {
-      return new BankAccountBuilder();
-    }
-
-    public static final class BankAccountBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BankAccountBuilder() {}
-
-      public BankAccountBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder iban(String value) {
-
-        formData.put("iban", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder bankName(String value) {
-
-        formData.put("bank_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountNumber(String value) {
-
-        formData.put("account_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder routingNumber(String value) {
-
-        formData.put("routing_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder bankCode(String value) {
-
-        formData.put("bank_code", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountType(AccountType value) {
-
-        formData.put("account_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountHolderType(AccountHolderType value) {
-
-        formData.put("account_holder_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder echeckType(EcheckType value) {
-
-        formData.put("echeck_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder issuingCountry(String value) {
-
-        formData.put("issuing_country", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder swedishIdentityNumber(String value) {
-
-        formData.put("swedish_identity_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder billingAddress(java.util.Map<String, Object> value) {
-
-        formData.put("billing_address", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public BankAccountParams build() {
-        return new BankAccountParams(this);
-      }
-    }
-
-    public enum AccountType {
-      CHECKING("checking"),
-
-      SAVINGS("savings"),
-
-      BUSINESS_CHECKING("business_checking"),
-
-      CURRENT("current"),
-
-      /** An enum member indicating that AccountType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AccountType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AccountType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AccountType enumValue : AccountType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum AccountHolderType {
-      INDIVIDUAL("individual"),
-
-      COMPANY("company"),
-
-      /**
-       * An enum member indicating that AccountHolderType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      AccountHolderType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AccountHolderType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AccountHolderType enumValue : AccountHolderType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum EcheckType {
-      WEB("web"),
-
-      PPD("ppd"),
-
-      CCD("ccd"),
-
-      /** An enum member indicating that EcheckType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EcheckType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EcheckType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EcheckType enumValue : EcheckType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentMethodParams(PaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentMethodBuilder builder() {
-      return new PaymentMethodBuilder();
-    }
-
-    public static final class PaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentMethodBuilder() {}
-
-      public PaymentMethodBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentMethodBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder issuingCountry(String value) {
-
-        formData.put("issuing_country", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentMethodParams build() {
-        return new PaymentMethodParams(this);
-      }
-    }
-
-    public enum Type {
-      CARD("card"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      GENERIC("generic"),
-
-      ALIPAY("alipay"),
-
-      UNIONPAY("unionpay"),
-
-      APPLE_PAY("apple_pay"),
-
-      WECHAT_PAY("wechat_pay"),
-
-      IDEAL("ideal"),
-
-      GOOGLE_PAY("google_pay"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GIROPAY("giropay"),
-
-      DOTPAY("dotpay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      VENMO("venmo"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      GOCARDLESS("gocardless"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public AddonsBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class ChargesParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargesParams(ChargesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargesBuilder builder() {
-      return new ChargesBuilder();
-    }
-
-    public static final class ChargesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargesBuilder() {}
-
-      public ChargesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public ChargesBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public ChargesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxable(Boolean value) {
-
-        formData.put("taxable", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxProfileId(String value) {
-
-        formData.put("tax_profile_id", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTaxCode(String value) {
-
-        formData.put("avalara_tax_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder hsnCode(String value) {
-
-        formData.put("hsn_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxjarProductCode(String value) {
-
-        formData.put("taxjar_product_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ChargesParams build() {
-        return new ChargesParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-
-  public static final class NotesToRemoveParams {
-
-    private final Map<String, Object> formData;
-
-    private NotesToRemoveParams(NotesToRemoveBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NotesToRemoveParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NotesToRemoveBuilder builder() {
-      return new NotesToRemoveBuilder();
-    }
-
-    public static final class NotesToRemoveBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NotesToRemoveBuilder() {}
-
-      public NotesToRemoveBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public NotesToRemoveBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public NotesToRemoveParams build() {
-        return new NotesToRemoveParams(this);
-      }
-    }
-
-    public enum EntityType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CUSTOMER("customer"),
-
-      SUBSCRIPTION("subscription"),
-
-      COUPON("coupon"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceDeleteLineItemsParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceDeleteLineItemsParams.java
deleted file mode 100644
index 53915b27..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceDeleteLineItemsParams.java
+++ /dev/null
@@ -1,97 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class InvoiceDeleteLineItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceDeleteLineItemsParams(InvoiceDeleteLineItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceDeleteLineItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceDeleteLineItemsBuilder builder() {
-    return new InvoiceDeleteLineItemsBuilder();
-  }
-
-  public static final class InvoiceDeleteLineItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceDeleteLineItemsBuilder() {}
-
-    public InvoiceDeleteLineItemsBuilder lineItems(List<LineItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          LineItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "line_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceDeleteLineItemsParams build() {
-      return new InvoiceDeleteLineItemsParams(this);
-    }
-  }
-
-  public static final class LineItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private LineItemsParams(LineItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LineItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LineItemsBuilder builder() {
-      return new LineItemsBuilder();
-    }
-
-    public static final class LineItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LineItemsBuilder() {}
-
-      public LineItemsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public LineItemsParams build() {
-        return new LineItemsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceDeleteParams.java
deleted file mode 100644
index 9db1a811..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceDeleteParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceDeleteParams(InvoiceDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceDeleteBuilder builder() {
-    return new InvoiceDeleteBuilder();
-  }
-
-  public static final class InvoiceDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceDeleteBuilder() {}
-
-    public InvoiceDeleteBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceDeleteParams build() {
-      return new InvoiceDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceDownloadEinvoiceParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceDownloadEinvoiceParams.java
deleted file mode 100644
index a5202d4b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceDownloadEinvoiceParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceDownloadEinvoiceParams {
-
-  private final Map<String, Object> queryParams;
-
-  private InvoiceDownloadEinvoiceParams(InvoiceDownloadEinvoiceBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public InvoiceDownloadEinvoiceBuilder toBuilder() {
-    InvoiceDownloadEinvoiceBuilder builder = new InvoiceDownloadEinvoiceBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for InvoiceDownloadEinvoiceParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceDownloadEinvoiceBuilder builder() {
-    return new InvoiceDownloadEinvoiceBuilder();
-  }
-
-  public static final class InvoiceDownloadEinvoiceBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private InvoiceDownloadEinvoiceBuilder() {}
-
-    public InvoiceDownloadEinvoiceParams build() {
-      return new InvoiceDownloadEinvoiceParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceImportInvoiceParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceImportInvoiceParams.java
deleted file mode 100644
index 5bab1e4b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceImportInvoiceParams.java
+++ /dev/null
@@ -1,1928 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class InvoiceImportInvoiceParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceImportInvoiceParams(InvoiceImportInvoiceBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceImportInvoiceParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceImportInvoiceBuilder builder() {
-    return new InvoiceImportInvoiceBuilder();
-  }
-
-  public static final class InvoiceImportInvoiceBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceImportInvoiceBuilder() {}
-
-    public InvoiceImportInvoiceBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder priceType(PriceType value) {
-
-      formData.put("price_type", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder taxOverrideReason(TaxOverrideReason value) {
-
-      formData.put("tax_override_reason", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder vatNumber(String value) {
-
-      formData.put("vat_number", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder vatNumberPrefix(String value) {
-
-      formData.put("vat_number_prefix", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder date(Timestamp value) {
-
-      formData.put("date", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder total(Long value) {
-
-      formData.put("total", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder roundOff(Long value) {
-
-      formData.put("round_off", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder voidedAt(Timestamp value) {
-
-      formData.put("voided_at", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder voidReasonCode(String value) {
-
-      formData.put("void_reason_code", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder isWrittenOff(Boolean value) {
-
-      formData.put("is_written_off", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder writeOffAmount(Long value) {
-
-      formData.put("write_off_amount", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder writeOffDate(Timestamp value) {
-
-      formData.put("write_off_date", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder dueDate(Timestamp value) {
-
-      formData.put("due_date", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder netTermDays(Integer value) {
-
-      formData.put("net_term_days", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder hasAdvanceCharges(Boolean value) {
-
-      formData.put("has_advance_charges", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder useForProration(Boolean value) {
-
-      formData.put("use_for_proration", value);
-
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder creditNote(CreditNoteParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "credit_note[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder lineItems(List<LineItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          LineItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "line_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder paymentReferenceNumbers(
-        List<PaymentReferenceNumbersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          PaymentReferenceNumbersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "payment_reference_numbers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder lineItemTiers(List<LineItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          LineItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "line_item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder taxes(List<TaxesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "taxes[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder payments(List<PaymentsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          PaymentsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "payments[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder notes(List<NotesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          NotesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "notes[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public InvoiceImportInvoiceBuilder lineItemAddresses(List<LineItemAddressesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          LineItemAddressesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "line_item_addresses[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public InvoiceImportInvoiceBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public InvoiceImportInvoiceBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceImportInvoiceParams build() {
-      return new InvoiceImportInvoiceParams(this);
-    }
-  }
-
-  public enum PriceType {
-    TAX_EXCLUSIVE("tax_exclusive"),
-
-    TAX_INCLUSIVE("tax_inclusive"),
-
-    /** An enum member indicating that PriceType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PriceType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PriceType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PriceType enumValue : PriceType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TaxOverrideReason {
-    ID_EXEMPT("id_exempt"),
-
-    CUSTOMER_EXEMPT("customer_exempt"),
-
-    EXPORT("export"),
-
-    /** An enum member indicating that TaxOverrideReason was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TaxOverrideReason(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TaxOverrideReason fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TaxOverrideReason enumValue : TaxOverrideReason.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Status {
-    PAID("paid"),
-
-    POSTED("posted"),
-
-    PAYMENT_DUE("payment_due"),
-
-    NOT_PAID("not_paid"),
-
-    VOIDED("voided"),
-
-    PENDING("pending"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class CreditNoteParams {
-
-    private final Map<String, Object> formData;
-
-    private CreditNoteParams(CreditNoteBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreditNoteParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreditNoteBuilder builder() {
-      return new CreditNoteBuilder();
-    }
-
-    public static final class CreditNoteBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreditNoteBuilder() {}
-
-      public CreditNoteBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CreditNoteParams build() {
-        return new CreditNoteParams(this);
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class LineItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private LineItemsParams(LineItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LineItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LineItemsBuilder builder() {
-      return new LineItemsBuilder();
-    }
-
-    public static final class LineItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LineItemsBuilder() {}
-
-      public LineItemsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder subscriptionId(String value) {
-
-        formData.put("subscription_id", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder unitAmount(Long value) {
-
-        formData.put("unit_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder unitAmountInDecimal(String value) {
-
-        formData.put("unit_amount_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder itemLevelDiscount1EntityId(String value) {
-
-        formData.put("item_level_discount1_entity_id", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder itemLevelDiscount1Amount(Long value) {
-
-        formData.put("item_level_discount1_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder itemLevelDiscount2EntityId(String value) {
-
-        formData.put("item_level_discount2_entity_id", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder itemLevelDiscount2Amount(Long value) {
-
-        formData.put("item_level_discount2_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax1Name(String value) {
-
-        formData.put("tax1_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax1Amount(Long value) {
-
-        formData.put("tax1_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax2Name(String value) {
-
-        formData.put("tax2_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax2Amount(Long value) {
-
-        formData.put("tax2_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax3Name(String value) {
-
-        formData.put("tax3_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax3Amount(Long value) {
-
-        formData.put("tax3_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax4Name(String value) {
-
-        formData.put("tax4_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax4Amount(Long value) {
-
-        formData.put("tax4_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax5Name(String value) {
-
-        formData.put("tax5_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax5Amount(Long value) {
-
-        formData.put("tax5_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax6Name(String value) {
-
-        formData.put("tax6_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax6Amount(Long value) {
-
-        formData.put("tax6_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax7Name(String value) {
-
-        formData.put("tax7_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax7Amount(Long value) {
-
-        formData.put("tax7_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax8Name(String value) {
-
-        formData.put("tax8_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax8Amount(Long value) {
-
-        formData.put("tax8_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax9Name(String value) {
-
-        formData.put("tax9_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax9Amount(Long value) {
-
-        formData.put("tax9_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax10Name(String value) {
-
-        formData.put("tax10_name", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder tax10Amount(Long value) {
-
-        formData.put("tax10_amount", value);
-
-        return this;
-      }
-
-      public LineItemsBuilder createdAt(Timestamp value) {
-
-        formData.put("created_at", value);
-
-        return this;
-      }
-
-      public LineItemsParams build() {
-        return new LineItemsParams(this);
-      }
-    }
-
-    public enum EntityType {
-      ADHOC("adhoc"),
-
-      PLAN_ITEM_PRICE("plan_item_price"),
-
-      ADDON_ITEM_PRICE("addon_item_price"),
-
-      CHARGE_ITEM_PRICE("charge_item_price"),
-
-      PLAN_SETUP("plan_setup"),
-
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentReferenceNumbersParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentReferenceNumbersParams(PaymentReferenceNumbersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentReferenceNumbersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentReferenceNumbersBuilder builder() {
-      return new PaymentReferenceNumbersBuilder();
-    }
-
-    public static final class PaymentReferenceNumbersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentReferenceNumbersBuilder() {}
-
-      public PaymentReferenceNumbersBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentReferenceNumbersBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      public PaymentReferenceNumbersBuilder number(String value) {
-
-        formData.put("number", value);
-
-        return this;
-      }
-
-      public PaymentReferenceNumbersParams build() {
-        return new PaymentReferenceNumbersParams(this);
-      }
-    }
-
-    public enum Type {
-      KID("kid"),
-
-      OCR("ocr"),
-
-      FRN("frn"),
-
-      FIK("fik"),
-
-      SWISS_REFERENCE("swiss_reference"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class LineItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private LineItemTiersParams(LineItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LineItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LineItemTiersBuilder builder() {
-      return new LineItemTiersBuilder();
-    }
-
-    public static final class LineItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LineItemTiersBuilder() {}
-
-      public LineItemTiersBuilder lineItemId(String value) {
-
-        formData.put("line_item_id", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder quantityUsed(Integer value) {
-
-        formData.put("quantity_used", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder unitAmount(Long value) {
-
-        formData.put("unit_amount", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder quantityUsedInDecimal(String value) {
-
-        formData.put("quantity_used_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemTiersBuilder unitAmountInDecimal(String value) {
-
-        formData.put("unit_amount_in_decimal", value);
-
-        return this;
-      }
-
-      public LineItemTiersParams build() {
-        return new LineItemTiersParams(this);
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum EntityType {
-      ITEM_LEVEL_COUPON("item_level_coupon"),
-
-      DOCUMENT_LEVEL_COUPON("document_level_coupon"),
-
-      PROMOTIONAL_CREDITS("promotional_credits"),
-
-      ITEM_LEVEL_DISCOUNT("item_level_discount"),
-
-      DOCUMENT_LEVEL_DISCOUNT("document_level_discount"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxesParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxesParams(TaxesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxesBuilder builder() {
-      return new TaxesBuilder();
-    }
-
-    public static final class TaxesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxesBuilder() {}
-
-      public TaxesBuilder name(String value) {
-
-        formData.put("name", value);
-
-        return this;
-      }
-
-      public TaxesBuilder rate(Number value) {
-
-        formData.put("rate", value);
-
-        return this;
-      }
-
-      public TaxesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public TaxesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public TaxesBuilder jurisType(JurisType value) {
-
-        formData.put("juris_type", value);
-
-        return this;
-      }
-
-      public TaxesBuilder jurisName(String value) {
-
-        formData.put("juris_name", value);
-
-        return this;
-      }
-
-      public TaxesBuilder jurisCode(String value) {
-
-        formData.put("juris_code", value);
-
-        return this;
-      }
-
-      public TaxesParams build() {
-        return new TaxesParams(this);
-      }
-    }
-
-    public enum JurisType {
-      COUNTRY("country"),
-
-      FEDERAL("federal"),
-
-      STATE("state"),
-
-      COUNTY("county"),
-
-      CITY("city"),
-
-      SPECIAL("special"),
-
-      UNINCORPORATED("unincorporated"),
-
-      OTHER("other"),
-
-      /** An enum member indicating that JurisType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      JurisType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static JurisType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (JurisType enumValue : JurisType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentsParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentsParams(PaymentsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentsBuilder builder() {
-      return new PaymentsBuilder();
-    }
-
-    public static final class PaymentsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentsBuilder() {}
-
-      public PaymentsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public PaymentsBuilder paymentMethod(PaymentMethod value) {
-
-        formData.put("payment_method", value);
-
-        return this;
-      }
-
-      public PaymentsBuilder date(Timestamp value) {
-
-        formData.put("date", value);
-
-        return this;
-      }
-
-      public PaymentsBuilder referenceNumber(String value) {
-
-        formData.put("reference_number", value);
-
-        return this;
-      }
-
-      public PaymentsParams build() {
-        return new PaymentsParams(this);
-      }
-    }
-
-    public enum PaymentMethod {
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      OTHER("other"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethod enumValue : PaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class NotesParams {
-
-    private final Map<String, Object> formData;
-
-    private NotesParams(NotesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for NotesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static NotesBuilder builder() {
-      return new NotesBuilder();
-    }
-
-    public static final class NotesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private NotesBuilder() {}
-
-      public NotesBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public NotesBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public NotesBuilder note(String value) {
-
-        formData.put("note", value);
-
-        return this;
-      }
-
-      public NotesParams build() {
-        return new NotesParams(this);
-      }
-    }
-
-    public enum EntityType {
-      COUPON("coupon"),
-
-      PLAN_ITEM_PRICE("plan_item_price"),
-
-      ADDON_ITEM_PRICE("addon_item_price"),
-
-      CHARGE_ITEM_PRICE("charge_item_price"),
-
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class LineItemAddressesParams {
-
-    private final Map<String, Object> formData;
-
-    private LineItemAddressesParams(LineItemAddressesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for LineItemAddressesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static LineItemAddressesBuilder builder() {
-      return new LineItemAddressesBuilder();
-    }
-
-    public static final class LineItemAddressesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private LineItemAddressesBuilder() {}
-
-      public LineItemAddressesBuilder lineItemId(String value) {
-
-        formData.put("line_item_id", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public LineItemAddressesBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public LineItemAddressesParams build() {
-        return new LineItemAddressesParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceInvoicesForCustomerParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceInvoicesForCustomerParams.java
deleted file mode 100644
index a15b8750..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceInvoicesForCustomerParams.java
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceInvoicesForCustomerParams {
-
-  private final Map<String, Object> queryParams;
-
-  private InvoiceInvoicesForCustomerParams(InvoiceInvoicesForCustomerBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public InvoiceInvoicesForCustomerBuilder toBuilder() {
-    InvoiceInvoicesForCustomerBuilder builder = new InvoiceInvoicesForCustomerBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for InvoiceInvoicesForCustomerParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceInvoicesForCustomerBuilder builder() {
-    return new InvoiceInvoicesForCustomerBuilder();
-  }
-
-  public static final class InvoiceInvoicesForCustomerBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private InvoiceInvoicesForCustomerBuilder() {}
-
-    public InvoiceInvoicesForCustomerBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public InvoiceInvoicesForCustomerBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public InvoiceInvoicesForCustomerParams build() {
-      return new InvoiceInvoicesForCustomerParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceInvoicesForSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceInvoicesForSubscriptionParams.java
deleted file mode 100644
index 8bb61239..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceInvoicesForSubscriptionParams.java
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceInvoicesForSubscriptionParams {
-
-  private final Map<String, Object> queryParams;
-
-  private InvoiceInvoicesForSubscriptionParams(InvoiceInvoicesForSubscriptionBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public InvoiceInvoicesForSubscriptionBuilder toBuilder() {
-    InvoiceInvoicesForSubscriptionBuilder builder = new InvoiceInvoicesForSubscriptionBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for InvoiceInvoicesForSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceInvoicesForSubscriptionBuilder builder() {
-    return new InvoiceInvoicesForSubscriptionBuilder();
-  }
-
-  public static final class InvoiceInvoicesForSubscriptionBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private InvoiceInvoicesForSubscriptionBuilder() {}
-
-    public InvoiceInvoicesForSubscriptionBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public InvoiceInvoicesForSubscriptionBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public InvoiceInvoicesForSubscriptionParams build() {
-      return new InvoiceInvoicesForSubscriptionParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoicePauseDunningParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoicePauseDunningParams.java
deleted file mode 100644
index ef9ffb17..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoicePauseDunningParams.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class InvoicePauseDunningParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoicePauseDunningParams(InvoicePauseDunningBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoicePauseDunningParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoicePauseDunningBuilder builder() {
-    return new InvoicePauseDunningBuilder();
-  }
-
-  public static final class InvoicePauseDunningBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoicePauseDunningBuilder() {}
-
-    public InvoicePauseDunningBuilder expectedPaymentDate(Timestamp value) {
-
-      formData.put("expected_payment_date", value);
-
-      return this;
-    }
-
-    public InvoicePauseDunningBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoicePauseDunningParams build() {
-      return new InvoicePauseDunningParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRecordPaymentParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRecordPaymentParams.java
deleted file mode 100644
index e3362607..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRecordPaymentParams.java
+++ /dev/null
@@ -1,223 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class InvoiceRecordPaymentParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceRecordPaymentParams(InvoiceRecordPaymentBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceRecordPaymentParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceRecordPaymentBuilder builder() {
-    return new InvoiceRecordPaymentBuilder();
-  }
-
-  public static final class InvoiceRecordPaymentBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceRecordPaymentBuilder() {}
-
-    public InvoiceRecordPaymentBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceRecordPaymentBuilder transaction(TransactionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "transaction[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceRecordPaymentParams build() {
-      return new InvoiceRecordPaymentParams(this);
-    }
-  }
-
-  public static final class TransactionParams {
-
-    private final Map<String, Object> formData;
-
-    private TransactionParams(TransactionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TransactionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TransactionBuilder builder() {
-      return new TransactionBuilder();
-    }
-
-    public static final class TransactionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TransactionBuilder() {}
-
-      public TransactionBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public TransactionBuilder paymentMethod(PaymentMethod value) {
-
-        formData.put("payment_method", value);
-
-        return this;
-      }
-
-      public TransactionBuilder referenceNumber(String value) {
-
-        formData.put("reference_number", value);
-
-        return this;
-      }
-
-      public TransactionBuilder customPaymentMethodId(String value) {
-
-        formData.put("custom_payment_method_id", value);
-
-        return this;
-      }
-
-      public TransactionBuilder idAtGateway(String value) {
-
-        formData.put("id_at_gateway", value);
-
-        return this;
-      }
-
-      public TransactionBuilder status(Status value) {
-
-        formData.put("status", value);
-
-        return this;
-      }
-
-      public TransactionBuilder date(Timestamp value) {
-
-        formData.put("date", value);
-
-        return this;
-      }
-
-      public TransactionBuilder errorCode(String value) {
-
-        formData.put("error_code", value);
-
-        return this;
-      }
-
-      public TransactionBuilder errorText(String value) {
-
-        formData.put("error_text", value);
-
-        return this;
-      }
-
-      public TransactionParams build() {
-        return new TransactionParams(this);
-      }
-    }
-
-    public enum PaymentMethod {
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      OTHER("other"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethod enumValue : PaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum Status {
-      SUCCESS("success"),
-
-      FAILURE("failure"),
-
-      LATE_FAILURE("late_failure"),
-
-      /** An enum member indicating that Status was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Status(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Status fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Status enumValue : Status.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRecordRefundParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRecordRefundParams.java
deleted file mode 100644
index 343b185a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRecordRefundParams.java
+++ /dev/null
@@ -1,267 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class InvoiceRecordRefundParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceRecordRefundParams(InvoiceRecordRefundBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceRecordRefundParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceRecordRefundBuilder builder() {
-    return new InvoiceRecordRefundBuilder();
-  }
-
-  public static final class InvoiceRecordRefundBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceRecordRefundBuilder() {}
-
-    public InvoiceRecordRefundBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceRecordRefundBuilder customerNotes(String value) {
-
-      formData.put("customer_notes", value);
-
-      return this;
-    }
-
-    public InvoiceRecordRefundBuilder transaction(TransactionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "transaction[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceRecordRefundBuilder creditNote(CreditNoteParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "credit_note[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceRecordRefundParams build() {
-      return new InvoiceRecordRefundParams(this);
-    }
-  }
-
-  public static final class TransactionParams {
-
-    private final Map<String, Object> formData;
-
-    private TransactionParams(TransactionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TransactionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TransactionBuilder builder() {
-      return new TransactionBuilder();
-    }
-
-    public static final class TransactionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TransactionBuilder() {}
-
-      public TransactionBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public TransactionBuilder paymentMethod(PaymentMethod value) {
-
-        formData.put("payment_method", value);
-
-        return this;
-      }
-
-      public TransactionBuilder referenceNumber(String value) {
-
-        formData.put("reference_number", value);
-
-        return this;
-      }
-
-      public TransactionBuilder customPaymentMethodId(String value) {
-
-        formData.put("custom_payment_method_id", value);
-
-        return this;
-      }
-
-      public TransactionBuilder date(Timestamp value) {
-
-        formData.put("date", value);
-
-        return this;
-      }
-
-      public TransactionParams build() {
-        return new TransactionParams(this);
-      }
-    }
-
-    public enum PaymentMethod {
-      CASH("cash"),
-
-      CHECK("check"),
-
-      CHARGEBACK("chargeback"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      OTHER("other"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethod enumValue : PaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CreditNoteParams {
-
-    private final Map<String, Object> formData;
-
-    private CreditNoteParams(CreditNoteBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreditNoteParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreditNoteBuilder builder() {
-      return new CreditNoteBuilder();
-    }
-
-    public static final class CreditNoteBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreditNoteBuilder() {}
-
-      public CreditNoteBuilder reasonCode(ReasonCode value) {
-
-        formData.put("reason_code", value);
-
-        return this;
-      }
-
-      public CreditNoteBuilder createReasonCode(String value) {
-
-        formData.put("create_reason_code", value);
-
-        return this;
-      }
-
-      public CreditNoteParams build() {
-        return new CreditNoteParams(this);
-      }
-    }
-
-    public enum ReasonCode {
-      CHARGEBACK("chargeback"),
-
-      PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
-
-      SERVICE_UNSATISFACTORY("service_unsatisfactory"),
-
-      ORDER_CHANGE("order_change"),
-
-      ORDER_CANCELLATION("order_cancellation"),
-
-      WAIVER("waiver"),
-
-      OTHER("other"),
-
-      /** An enum member indicating that ReasonCode was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ReasonCode(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ReasonCode fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ReasonCode enumValue : ReasonCode.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRecordTaxWithheldParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRecordTaxWithheldParams.java
deleted file mode 100644
index 19e1b5e4..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRecordTaxWithheldParams.java
+++ /dev/null
@@ -1,113 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class InvoiceRecordTaxWithheldParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceRecordTaxWithheldParams(InvoiceRecordTaxWithheldBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceRecordTaxWithheldParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceRecordTaxWithheldBuilder builder() {
-    return new InvoiceRecordTaxWithheldBuilder();
-  }
-
-  public static final class InvoiceRecordTaxWithheldBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceRecordTaxWithheldBuilder() {}
-
-    public InvoiceRecordTaxWithheldBuilder taxWithheld(TaxWithheldParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "tax_withheld[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceRecordTaxWithheldParams build() {
-      return new InvoiceRecordTaxWithheldParams(this);
-    }
-  }
-
-  public static final class TaxWithheldParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxWithheldParams(TaxWithheldBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxWithheldParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxWithheldBuilder builder() {
-      return new TaxWithheldBuilder();
-    }
-
-    public static final class TaxWithheldBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxWithheldBuilder() {}
-
-      public TaxWithheldBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public TaxWithheldBuilder referenceNumber(String value) {
-
-        formData.put("reference_number", value);
-
-        return this;
-      }
-
-      public TaxWithheldBuilder date(Timestamp value) {
-
-        formData.put("date", value);
-
-        return this;
-      }
-
-      public TaxWithheldBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public TaxWithheldParams build() {
-        return new TaxWithheldParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRefundParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRefundParams.java
deleted file mode 100644
index e3a094ae..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRefundParams.java
+++ /dev/null
@@ -1,155 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceRefundParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceRefundParams(InvoiceRefundBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceRefundParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceRefundBuilder builder() {
-    return new InvoiceRefundBuilder();
-  }
-
-  public static final class InvoiceRefundBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceRefundBuilder() {}
-
-    public InvoiceRefundBuilder refundAmount(Long value) {
-
-      formData.put("refund_amount", value);
-
-      return this;
-    }
-
-    public InvoiceRefundBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceRefundBuilder customerNotes(String value) {
-
-      formData.put("customer_notes", value);
-
-      return this;
-    }
-
-    public InvoiceRefundBuilder creditNote(CreditNoteParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "credit_note[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceRefundParams build() {
-      return new InvoiceRefundParams(this);
-    }
-  }
-
-  public static final class CreditNoteParams {
-
-    private final Map<String, Object> formData;
-
-    private CreditNoteParams(CreditNoteBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreditNoteParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreditNoteBuilder builder() {
-      return new CreditNoteBuilder();
-    }
-
-    public static final class CreditNoteBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreditNoteBuilder() {}
-
-      public CreditNoteBuilder reasonCode(ReasonCode value) {
-
-        formData.put("reason_code", value);
-
-        return this;
-      }
-
-      public CreditNoteBuilder createReasonCode(String value) {
-
-        formData.put("create_reason_code", value);
-
-        return this;
-      }
-
-      public CreditNoteParams build() {
-        return new CreditNoteParams(this);
-      }
-    }
-
-    public enum ReasonCode {
-      PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
-
-      SERVICE_UNSATISFACTORY("service_unsatisfactory"),
-
-      ORDER_CHANGE("order_change"),
-
-      ORDER_CANCELLATION("order_cancellation"),
-
-      WAIVER("waiver"),
-
-      OTHER("other"),
-
-      /** An enum member indicating that ReasonCode was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ReasonCode(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ReasonCode fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ReasonCode enumValue : ReasonCode.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRemoveCreditNoteParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRemoveCreditNoteParams.java
deleted file mode 100644
index b8acc218..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRemoveCreditNoteParams.java
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceRemoveCreditNoteParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceRemoveCreditNoteParams(InvoiceRemoveCreditNoteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceRemoveCreditNoteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceRemoveCreditNoteBuilder builder() {
-    return new InvoiceRemoveCreditNoteBuilder();
-  }
-
-  public static final class InvoiceRemoveCreditNoteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceRemoveCreditNoteBuilder() {}
-
-    public InvoiceRemoveCreditNoteBuilder creditNote(CreditNoteParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "credit_note[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceRemoveCreditNoteParams build() {
-      return new InvoiceRemoveCreditNoteParams(this);
-    }
-  }
-
-  public static final class CreditNoteParams {
-
-    private final Map<String, Object> formData;
-
-    private CreditNoteParams(CreditNoteBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreditNoteParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreditNoteBuilder builder() {
-      return new CreditNoteBuilder();
-    }
-
-    public static final class CreditNoteBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreditNoteBuilder() {}
-
-      public CreditNoteBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CreditNoteParams build() {
-        return new CreditNoteParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRemovePaymentParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRemovePaymentParams.java
deleted file mode 100644
index 2223be10..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRemovePaymentParams.java
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceRemovePaymentParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceRemovePaymentParams(InvoiceRemovePaymentBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceRemovePaymentParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceRemovePaymentBuilder builder() {
-    return new InvoiceRemovePaymentBuilder();
-  }
-
-  public static final class InvoiceRemovePaymentBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceRemovePaymentBuilder() {}
-
-    public InvoiceRemovePaymentBuilder transaction(TransactionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "transaction[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceRemovePaymentParams build() {
-      return new InvoiceRemovePaymentParams(this);
-    }
-  }
-
-  public static final class TransactionParams {
-
-    private final Map<String, Object> formData;
-
-    private TransactionParams(TransactionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TransactionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TransactionBuilder builder() {
-      return new TransactionBuilder();
-    }
-
-    public static final class TransactionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TransactionBuilder() {}
-
-      public TransactionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public TransactionParams build() {
-        return new TransactionParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRemoveTaxWithheldParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRemoveTaxWithheldParams.java
deleted file mode 100644
index 40541aa7..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRemoveTaxWithheldParams.java
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceRemoveTaxWithheldParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceRemoveTaxWithheldParams(InvoiceRemoveTaxWithheldBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceRemoveTaxWithheldParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceRemoveTaxWithheldBuilder builder() {
-    return new InvoiceRemoveTaxWithheldBuilder();
-  }
-
-  public static final class InvoiceRemoveTaxWithheldBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceRemoveTaxWithheldBuilder() {}
-
-    public InvoiceRemoveTaxWithheldBuilder taxWithheld(TaxWithheldParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "tax_withheld[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceRemoveTaxWithheldParams build() {
-      return new InvoiceRemoveTaxWithheldParams(this);
-    }
-  }
-
-  public static final class TaxWithheldParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxWithheldParams(TaxWithheldBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxWithheldParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxWithheldBuilder builder() {
-      return new TaxWithheldBuilder();
-    }
-
-    public static final class TaxWithheldBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxWithheldBuilder() {}
-
-      public TaxWithheldBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public TaxWithheldParams build() {
-        return new TaxWithheldParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceResendEinvoiceParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceResendEinvoiceParams.java
deleted file mode 100644
index 28a49f65..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceResendEinvoiceParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceResendEinvoiceParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceResendEinvoiceParams(InvoiceResendEinvoiceBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceResendEinvoiceParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceResendEinvoiceBuilder builder() {
-    return new InvoiceResendEinvoiceBuilder();
-  }
-
-  public static final class InvoiceResendEinvoiceBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceResendEinvoiceBuilder() {}
-
-    public InvoiceResendEinvoiceParams build() {
-      return new InvoiceResendEinvoiceParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceSendEinvoiceParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceSendEinvoiceParams.java
deleted file mode 100644
index 045b31a8..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceSendEinvoiceParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceSendEinvoiceParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceSendEinvoiceParams(InvoiceSendEinvoiceBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceSendEinvoiceParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceSendEinvoiceBuilder builder() {
-    return new InvoiceSendEinvoiceBuilder();
-  }
-
-  public static final class InvoiceSendEinvoiceBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceSendEinvoiceBuilder() {}
-
-    public InvoiceSendEinvoiceParams build() {
-      return new InvoiceSendEinvoiceParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceStopDunningParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceStopDunningParams.java
deleted file mode 100644
index c34a1e40..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceStopDunningParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceStopDunningParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceStopDunningParams(InvoiceStopDunningBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceStopDunningParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceStopDunningBuilder builder() {
-    return new InvoiceStopDunningBuilder();
-  }
-
-  public static final class InvoiceStopDunningBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceStopDunningBuilder() {}
-
-    public InvoiceStopDunningBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceStopDunningParams build() {
-      return new InvoiceStopDunningParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceUpdateDetailsParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceUpdateDetailsParams.java
deleted file mode 100644
index e5963f6d..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceUpdateDetailsParams.java
+++ /dev/null
@@ -1,497 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceUpdateDetailsParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceUpdateDetailsParams(InvoiceUpdateDetailsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceUpdateDetailsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceUpdateDetailsBuilder builder() {
-    return new InvoiceUpdateDetailsBuilder();
-  }
-
-  public static final class InvoiceUpdateDetailsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceUpdateDetailsBuilder() {}
-
-    public InvoiceUpdateDetailsBuilder vatNumber(String value) {
-
-      formData.put("vat_number", value);
-
-      return this;
-    }
-
-    public InvoiceUpdateDetailsBuilder vatNumberPrefix(String value) {
-
-      formData.put("vat_number_prefix", value);
-
-      return this;
-    }
-
-    public InvoiceUpdateDetailsBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public InvoiceUpdateDetailsBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceUpdateDetailsBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceUpdateDetailsBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceUpdateDetailsBuilder statementDescriptor(StatementDescriptorParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public InvoiceUpdateDetailsBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public InvoiceUpdateDetailsBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public InvoiceUpdateDetailsParams build() {
-      return new InvoiceUpdateDetailsParams(this);
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatementDescriptorParams {
-
-    private final Map<String, Object> formData;
-
-    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatementDescriptorParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatementDescriptorBuilder builder() {
-      return new StatementDescriptorBuilder();
-    }
-
-    public static final class StatementDescriptorBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatementDescriptorBuilder() {}
-
-      public StatementDescriptorBuilder descriptor(String value) {
-
-        formData.put("descriptor", value);
-
-        return this;
-      }
-
-      public StatementDescriptorParams build() {
-        return new StatementDescriptorParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceVoidInvoiceParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceVoidInvoiceParams.java
deleted file mode 100644
index cd3ba17f..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceVoidInvoiceParams.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceVoidInvoiceParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceVoidInvoiceParams(InvoiceVoidInvoiceBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceVoidInvoiceParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceVoidInvoiceBuilder builder() {
-    return new InvoiceVoidInvoiceBuilder();
-  }
-
-  public static final class InvoiceVoidInvoiceBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceVoidInvoiceBuilder() {}
-
-    public InvoiceVoidInvoiceBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceVoidInvoiceBuilder voidReasonCode(String value) {
-
-      formData.put("void_reason_code", value);
-
-      return this;
-    }
-
-    public InvoiceVoidInvoiceParams build() {
-      return new InvoiceVoidInvoiceParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceWriteOffParams.java b/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceWriteOffParams.java
deleted file mode 100644
index 92d4a284..00000000
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceWriteOffParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.invoice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class InvoiceWriteOffParams {
-
-  private final Map<String, Object> formData;
-
-  private InvoiceWriteOffParams(InvoiceWriteOffBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for InvoiceWriteOffParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static InvoiceWriteOffBuilder builder() {
-    return new InvoiceWriteOffBuilder();
-  }
-
-  public static final class InvoiceWriteOffBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private InvoiceWriteOffBuilder() {}
-
-    public InvoiceWriteOffBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public InvoiceWriteOffParams build() {
-      return new InvoiceWriteOffParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/item/params/ItemCreateParams.java b/src/main/java/com/chargebee/v4/core/models/item/params/ItemCreateParams.java
deleted file mode 100644
index 8c9f493f..00000000
--- a/src/main/java/com/chargebee/v4/core/models/item/params/ItemCreateParams.java
+++ /dev/null
@@ -1,495 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.item.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.math.BigDecimal;
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class ItemCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private ItemCreateParams(ItemCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ItemCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ItemCreateBuilder builder() {
-    return new ItemCreateBuilder();
-  }
-
-  public static final class ItemCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ItemCreateBuilder() {}
-
-    public ItemCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder type(Type value) {
-
-      formData.put("type", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder itemFamilyId(String value) {
-
-      formData.put("item_family_id", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder isGiftable(Boolean value) {
-
-      formData.put("is_giftable", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder isShippable(Boolean value) {
-
-      formData.put("is_shippable", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder externalName(String value) {
-
-      formData.put("external_name", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder enabledInPortal(Boolean value) {
-
-      formData.put("enabled_in_portal", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder enabledForCheckout(Boolean value) {
-
-      formData.put("enabled_for_checkout", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder itemApplicability(ItemApplicability value) {
-
-      formData.put("item_applicability", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder applicableItems(List<String> value) {
-
-      formData.put("applicable_items", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder unit(String value) {
-
-      formData.put("unit", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder giftClaimRedirectUrl(String value) {
-
-      formData.put("gift_claim_redirect_url", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder includedInMrr(Boolean value) {
-
-      formData.put("included_in_mrr", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder metered(Boolean value) {
-
-      formData.put("metered", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder usageCalculation(UsageCalculation value) {
-
-      formData.put("usage_calculation", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder isPercentagePricing(Boolean value) {
-
-      formData.put("is_percentage_pricing", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder metadata(java.util.Map<String, Object> value) {
-
-      formData.put("metadata", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public ItemCreateBuilder businessEntityId(String value) {
-
-      formData.put("business_entity_id", value);
-
-      return this;
-    }
-
-    public ItemCreateBuilder bundleConfiguration(BundleConfigurationParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "bundle_configuration[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ItemCreateBuilder bundleItemsToAdd(List<BundleItemsToAddParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          BundleItemsToAddParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "bundle_items_to_add[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public ItemCreateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public ItemCreateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ItemCreateParams build() {
-      return new ItemCreateParams(this);
-    }
-  }
-
-  public enum Type {
-    PLAN("plan"),
-
-    ADDON("addon"),
-
-    CHARGE("charge"),
-
-    /** An enum member indicating that Type was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Type(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Type fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Type enumValue : Type.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ItemApplicability {
-    ALL("all"),
-
-    RESTRICTED("restricted"),
-
-    /** An enum member indicating that ItemApplicability was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ItemApplicability(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ItemApplicability fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ItemApplicability enumValue : ItemApplicability.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum UsageCalculation {
-    SUM_OF_USAGES("sum_of_usages"),
-
-    LAST_USAGE("last_usage"),
-
-    MAX_USAGE("max_usage"),
-
-    /** An enum member indicating that UsageCalculation was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    UsageCalculation(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static UsageCalculation fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (UsageCalculation enumValue : UsageCalculation.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class BundleConfigurationParams {
-
-    private final Map<String, Object> formData;
-
-    private BundleConfigurationParams(BundleConfigurationBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BundleConfigurationParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BundleConfigurationBuilder builder() {
-      return new BundleConfigurationBuilder();
-    }
-
-    public static final class BundleConfigurationBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BundleConfigurationBuilder() {}
-
-      public BundleConfigurationBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      public BundleConfigurationParams build() {
-        return new BundleConfigurationParams(this);
-      }
-    }
-
-    public enum Type {
-      FIXED("fixed"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BundleItemsToAddParams {
-
-    private final Map<String, Object> formData;
-
-    private BundleItemsToAddParams(BundleItemsToAddBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BundleItemsToAddParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BundleItemsToAddBuilder builder() {
-      return new BundleItemsToAddBuilder();
-    }
-
-    public static final class BundleItemsToAddBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BundleItemsToAddBuilder() {}
-
-      public BundleItemsToAddBuilder itemId(String value) {
-
-        formData.put("item_id", value);
-
-        return this;
-      }
-
-      public BundleItemsToAddBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public BundleItemsToAddBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public BundleItemsToAddBuilder priceAllocation(BigDecimal value) {
-
-        formData.put("price_allocation", value);
-
-        return this;
-      }
-
-      public BundleItemsToAddParams build() {
-        return new BundleItemsToAddParams(this);
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/item/params/ItemDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/item/params/ItemDeleteParams.java
deleted file mode 100644
index 1f849f3e..00000000
--- a/src/main/java/com/chargebee/v4/core/models/item/params/ItemDeleteParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.item.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ItemDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private ItemDeleteParams(ItemDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ItemDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ItemDeleteBuilder builder() {
-    return new ItemDeleteBuilder();
-  }
-
-  public static final class ItemDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ItemDeleteBuilder() {}
-
-    public ItemDeleteParams build() {
-      return new ItemDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/item/params/ItemUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/item/params/ItemUpdateParams.java
deleted file mode 100644
index b0cba0ec..00000000
--- a/src/main/java/com/chargebee/v4/core/models/item/params/ItemUpdateParams.java
+++ /dev/null
@@ -1,630 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.item.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.math.BigDecimal;
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class ItemUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private ItemUpdateParams(ItemUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ItemUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ItemUpdateBuilder builder() {
-    return new ItemUpdateBuilder();
-  }
-
-  public static final class ItemUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ItemUpdateBuilder() {}
-
-    public ItemUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder isShippable(Boolean value) {
-
-      formData.put("is_shippable", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder externalName(String value) {
-
-      formData.put("external_name", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder itemFamilyId(String value) {
-
-      formData.put("item_family_id", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder enabledInPortal(Boolean value) {
-
-      formData.put("enabled_in_portal", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder enabledForCheckout(Boolean value) {
-
-      formData.put("enabled_for_checkout", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder itemApplicability(ItemApplicability value) {
-
-      formData.put("item_applicability", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public ItemUpdateBuilder clearApplicableItems(Boolean value) {
-
-      formData.put("clear_applicable_items", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder applicableItems(List<String> value) {
-
-      formData.put("applicable_items", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder unit(String value) {
-
-      formData.put("unit", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder giftClaimRedirectUrl(String value) {
-
-      formData.put("gift_claim_redirect_url", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder metadata(java.util.Map<String, Object> value) {
-
-      formData.put("metadata", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public ItemUpdateBuilder includedInMrr(Boolean value) {
-
-      formData.put("included_in_mrr", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder isPercentagePricing(Boolean value) {
-
-      formData.put("is_percentage_pricing", value);
-
-      return this;
-    }
-
-    public ItemUpdateBuilder bundleConfiguration(BundleConfigurationParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "bundle_configuration[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ItemUpdateBuilder bundleItemsToAdd(List<BundleItemsToAddParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          BundleItemsToAddParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "bundle_items_to_add[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public ItemUpdateBuilder bundleItemsToUpdate(List<BundleItemsToUpdateParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          BundleItemsToUpdateParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "bundle_items_to_update[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public ItemUpdateBuilder bundleItemsToRemove(List<BundleItemsToRemoveParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          BundleItemsToRemoveParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "bundle_items_to_remove[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public ItemUpdateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public ItemUpdateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ItemUpdateParams build() {
-      return new ItemUpdateParams(this);
-    }
-  }
-
-  public enum ItemApplicability {
-    ALL("all"),
-
-    RESTRICTED("restricted"),
-
-    /** An enum member indicating that ItemApplicability was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ItemApplicability(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ItemApplicability fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ItemApplicability enumValue : ItemApplicability.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Status {
-    ACTIVE("active"),
-
-    ARCHIVED("archived"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class BundleConfigurationParams {
-
-    private final Map<String, Object> formData;
-
-    private BundleConfigurationParams(BundleConfigurationBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BundleConfigurationParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BundleConfigurationBuilder builder() {
-      return new BundleConfigurationBuilder();
-    }
-
-    public static final class BundleConfigurationBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BundleConfigurationBuilder() {}
-
-      public BundleConfigurationBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      public BundleConfigurationParams build() {
-        return new BundleConfigurationParams(this);
-      }
-    }
-
-    public enum Type {
-      FIXED("fixed"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BundleItemsToAddParams {
-
-    private final Map<String, Object> formData;
-
-    private BundleItemsToAddParams(BundleItemsToAddBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BundleItemsToAddParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BundleItemsToAddBuilder builder() {
-      return new BundleItemsToAddBuilder();
-    }
-
-    public static final class BundleItemsToAddBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BundleItemsToAddBuilder() {}
-
-      public BundleItemsToAddBuilder itemId(String value) {
-
-        formData.put("item_id", value);
-
-        return this;
-      }
-
-      public BundleItemsToAddBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public BundleItemsToAddBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public BundleItemsToAddBuilder priceAllocation(BigDecimal value) {
-
-        formData.put("price_allocation", value);
-
-        return this;
-      }
-
-      public BundleItemsToAddParams build() {
-        return new BundleItemsToAddParams(this);
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BundleItemsToUpdateParams {
-
-    private final Map<String, Object> formData;
-
-    private BundleItemsToUpdateParams(BundleItemsToUpdateBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BundleItemsToUpdateParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BundleItemsToUpdateBuilder builder() {
-      return new BundleItemsToUpdateBuilder();
-    }
-
-    public static final class BundleItemsToUpdateBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BundleItemsToUpdateBuilder() {}
-
-      public BundleItemsToUpdateBuilder itemId(String value) {
-
-        formData.put("item_id", value);
-
-        return this;
-      }
-
-      public BundleItemsToUpdateBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public BundleItemsToUpdateBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public BundleItemsToUpdateBuilder priceAllocation(BigDecimal value) {
-
-        formData.put("price_allocation", value);
-
-        return this;
-      }
-
-      public BundleItemsToUpdateParams build() {
-        return new BundleItemsToUpdateParams(this);
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BundleItemsToRemoveParams {
-
-    private final Map<String, Object> formData;
-
-    private BundleItemsToRemoveParams(BundleItemsToRemoveBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BundleItemsToRemoveParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BundleItemsToRemoveBuilder builder() {
-      return new BundleItemsToRemoveBuilder();
-    }
-
-    public static final class BundleItemsToRemoveBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BundleItemsToRemoveBuilder() {}
-
-      public BundleItemsToRemoveBuilder itemId(String value) {
-
-        formData.put("item_id", value);
-
-        return this;
-      }
-
-      public BundleItemsToRemoveBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public BundleItemsToRemoveParams build() {
-        return new BundleItemsToRemoveParams(this);
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/itemEntitlement/params/ItemEntitlementAddItemEntitlementsParams.java b/src/main/java/com/chargebee/v4/core/models/itemEntitlement/params/ItemEntitlementAddItemEntitlementsParams.java
deleted file mode 100644
index 3c39691a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/itemEntitlement/params/ItemEntitlementAddItemEntitlementsParams.java
+++ /dev/null
@@ -1,182 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.itemEntitlement.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class ItemEntitlementAddItemEntitlementsParams {
-
-  private final Map<String, Object> formData;
-
-  private ItemEntitlementAddItemEntitlementsParams(
-      ItemEntitlementAddItemEntitlementsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ItemEntitlementAddItemEntitlementsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ItemEntitlementAddItemEntitlementsBuilder builder() {
-    return new ItemEntitlementAddItemEntitlementsBuilder();
-  }
-
-  public static final class ItemEntitlementAddItemEntitlementsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ItemEntitlementAddItemEntitlementsBuilder() {}
-
-    public ItemEntitlementAddItemEntitlementsBuilder action(Action value) {
-
-      formData.put("action", value);
-
-      return this;
-    }
-
-    public ItemEntitlementAddItemEntitlementsBuilder itemEntitlements(
-        List<ItemEntitlementsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemEntitlementsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_entitlements[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public ItemEntitlementAddItemEntitlementsParams build() {
-      return new ItemEntitlementAddItemEntitlementsParams(this);
-    }
-  }
-
-  public enum Action {
-    UPSERT("upsert"),
-
-    REMOVE("remove"),
-
-    /** An enum member indicating that Action was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Action(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Action fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Action enumValue : Action.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ItemEntitlementsParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemEntitlementsParams(ItemEntitlementsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemEntitlementsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemEntitlementsBuilder builder() {
-      return new ItemEntitlementsBuilder();
-    }
-
-    public static final class ItemEntitlementsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemEntitlementsBuilder() {}
-
-      public ItemEntitlementsBuilder itemId(String value) {
-
-        formData.put("item_id", value);
-
-        return this;
-      }
-
-      public ItemEntitlementsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public ItemEntitlementsBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public ItemEntitlementsParams build() {
-        return new ItemEntitlementsParams(this);
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      SUBSCRIPTION("subscription"),
-
-      ITEM("item"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/itemEntitlement/params/ItemEntitlementItemEntitlementsForFeatureParams.java b/src/main/java/com/chargebee/v4/core/models/itemEntitlement/params/ItemEntitlementItemEntitlementsForFeatureParams.java
deleted file mode 100644
index a4320c8c..00000000
--- a/src/main/java/com/chargebee/v4/core/models/itemEntitlement/params/ItemEntitlementItemEntitlementsForFeatureParams.java
+++ /dev/null
@@ -1,68 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.itemEntitlement.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ItemEntitlementItemEntitlementsForFeatureParams {
-
-  private final Map<String, Object> queryParams;
-
-  private ItemEntitlementItemEntitlementsForFeatureParams(
-      ItemEntitlementItemEntitlementsForFeatureBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public ItemEntitlementItemEntitlementsForFeatureBuilder toBuilder() {
-    ItemEntitlementItemEntitlementsForFeatureBuilder builder =
-        new ItemEntitlementItemEntitlementsForFeatureBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for ItemEntitlementItemEntitlementsForFeatureParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ItemEntitlementItemEntitlementsForFeatureBuilder builder() {
-    return new ItemEntitlementItemEntitlementsForFeatureBuilder();
-  }
-
-  public static final class ItemEntitlementItemEntitlementsForFeatureBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private ItemEntitlementItemEntitlementsForFeatureBuilder() {}
-
-    public ItemEntitlementItemEntitlementsForFeatureBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public ItemEntitlementItemEntitlementsForFeatureBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    @Deprecated
-    public ItemEntitlementItemEntitlementsForFeatureBuilder includeDrafts(Boolean value) {
-      queryParams.put("include_drafts", value);
-      return this;
-    }
-
-    public ItemEntitlementItemEntitlementsForFeatureParams build() {
-      return new ItemEntitlementItemEntitlementsForFeatureParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/itemEntitlement/params/ItemEntitlementItemEntitlementsForItemParams.java b/src/main/java/com/chargebee/v4/core/models/itemEntitlement/params/ItemEntitlementItemEntitlementsForItemParams.java
deleted file mode 100644
index 0077dcbd..00000000
--- a/src/main/java/com/chargebee/v4/core/models/itemEntitlement/params/ItemEntitlementItemEntitlementsForItemParams.java
+++ /dev/null
@@ -1,74 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.itemEntitlement.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ItemEntitlementItemEntitlementsForItemParams {
-
-  private final Map<String, Object> queryParams;
-
-  private ItemEntitlementItemEntitlementsForItemParams(
-      ItemEntitlementItemEntitlementsForItemBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public ItemEntitlementItemEntitlementsForItemBuilder toBuilder() {
-    ItemEntitlementItemEntitlementsForItemBuilder builder =
-        new ItemEntitlementItemEntitlementsForItemBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for ItemEntitlementItemEntitlementsForItemParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ItemEntitlementItemEntitlementsForItemBuilder builder() {
-    return new ItemEntitlementItemEntitlementsForItemBuilder();
-  }
-
-  public static final class ItemEntitlementItemEntitlementsForItemBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private ItemEntitlementItemEntitlementsForItemBuilder() {}
-
-    public ItemEntitlementItemEntitlementsForItemBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public ItemEntitlementItemEntitlementsForItemBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    @Deprecated
-    public ItemEntitlementItemEntitlementsForItemBuilder includeDrafts(Boolean value) {
-      queryParams.put("include_drafts", value);
-      return this;
-    }
-
-    @Deprecated
-    public ItemEntitlementItemEntitlementsForItemBuilder embed(String value) {
-      queryParams.put("embed", value);
-      return this;
-    }
-
-    public ItemEntitlementItemEntitlementsForItemParams build() {
-      return new ItemEntitlementItemEntitlementsForItemParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/itemEntitlement/params/ItemEntitlementUpsertOrRemoveItemEntitlementsForItemParams.java b/src/main/java/com/chargebee/v4/core/models/itemEntitlement/params/ItemEntitlementUpsertOrRemoveItemEntitlementsForItemParams.java
deleted file mode 100644
index b58457ff..00000000
--- a/src/main/java/com/chargebee/v4/core/models/itemEntitlement/params/ItemEntitlementUpsertOrRemoveItemEntitlementsForItemParams.java
+++ /dev/null
@@ -1,141 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.itemEntitlement.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class ItemEntitlementUpsertOrRemoveItemEntitlementsForItemParams {
-
-  private final Map<String, Object> formData;
-
-  private ItemEntitlementUpsertOrRemoveItemEntitlementsForItemParams(
-      ItemEntitlementUpsertOrRemoveItemEntitlementsForItemBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ItemEntitlementUpsertOrRemoveItemEntitlementsForItemParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ItemEntitlementUpsertOrRemoveItemEntitlementsForItemBuilder builder() {
-    return new ItemEntitlementUpsertOrRemoveItemEntitlementsForItemBuilder();
-  }
-
-  public static final class ItemEntitlementUpsertOrRemoveItemEntitlementsForItemBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ItemEntitlementUpsertOrRemoveItemEntitlementsForItemBuilder() {}
-
-    public ItemEntitlementUpsertOrRemoveItemEntitlementsForItemBuilder action(Action value) {
-
-      formData.put("action", value);
-
-      return this;
-    }
-
-    public ItemEntitlementUpsertOrRemoveItemEntitlementsForItemBuilder itemEntitlements(
-        List<ItemEntitlementsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemEntitlementsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_entitlements[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public ItemEntitlementUpsertOrRemoveItemEntitlementsForItemParams build() {
-      return new ItemEntitlementUpsertOrRemoveItemEntitlementsForItemParams(this);
-    }
-  }
-
-  public enum Action {
-    UPSERT("upsert"),
-
-    REMOVE("remove"),
-
-    /** An enum member indicating that Action was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Action(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Action fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Action enumValue : Action.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ItemEntitlementsParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemEntitlementsParams(ItemEntitlementsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemEntitlementsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemEntitlementsBuilder builder() {
-      return new ItemEntitlementsBuilder();
-    }
-
-    public static final class ItemEntitlementsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemEntitlementsBuilder() {}
-
-      public ItemEntitlementsBuilder featureId(String value) {
-
-        formData.put("feature_id", value);
-
-        return this;
-      }
-
-      public ItemEntitlementsBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public ItemEntitlementsParams build() {
-        return new ItemEntitlementsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyCreateParams.java b/src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyCreateParams.java
deleted file mode 100644
index 547bc9f7..00000000
--- a/src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyCreateParams.java
+++ /dev/null
@@ -1,107 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.itemFamily.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ItemFamilyCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private ItemFamilyCreateParams(ItemFamilyCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ItemFamilyCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ItemFamilyCreateBuilder builder() {
-    return new ItemFamilyCreateBuilder();
-  }
-
-  public static final class ItemFamilyCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ItemFamilyCreateBuilder() {}
-
-    public ItemFamilyCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public ItemFamilyCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public ItemFamilyCreateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public ItemFamilyCreateBuilder businessEntityId(String value) {
-
-      formData.put("business_entity_id", value);
-
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public ItemFamilyCreateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public ItemFamilyCreateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ItemFamilyCreateParams build() {
-      return new ItemFamilyCreateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyUpdateParams.java
deleted file mode 100644
index 85bbba8b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyUpdateParams.java
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.itemFamily.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ItemFamilyUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private ItemFamilyUpdateParams(ItemFamilyUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ItemFamilyUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ItemFamilyUpdateBuilder builder() {
-    return new ItemFamilyUpdateBuilder();
-  }
-
-  public static final class ItemFamilyUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ItemFamilyUpdateBuilder() {}
-
-    public ItemFamilyUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public ItemFamilyUpdateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public ItemFamilyUpdateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public ItemFamilyUpdateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ItemFamilyUpdateParams build() {
-      return new ItemFamilyUpdateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceCreateParams.java b/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceCreateParams.java
deleted file mode 100644
index 353ebb8a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceCreateParams.java
+++ /dev/null
@@ -1,899 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.itemPrice.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class ItemPriceCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private ItemPriceCreateParams(ItemPriceCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ItemPriceCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ItemPriceCreateBuilder builder() {
-    return new ItemPriceCreateBuilder();
-  }
-
-  public static final class ItemPriceCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ItemPriceCreateBuilder() {}
-
-    public ItemPriceCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder itemId(String value) {
-
-      formData.put("item_id", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder prorationType(ProrationType value) {
-
-      formData.put("proration_type", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder externalName(String value) {
-
-      formData.put("external_name", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder priceVariantId(String value) {
-
-      formData.put("price_variant_id", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder isTaxable(Boolean value) {
-
-      formData.put("is_taxable", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder freeQuantity(Integer value) {
-
-      formData.put("free_quantity", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder freeQuantityInDecimal(String value) {
-
-      formData.put("free_quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder metadata(java.util.Map<String, Object> value) {
-
-      formData.put("metadata", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder showDescriptionInInvoices(Boolean value) {
-
-      formData.put("show_description_in_invoices", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder showDescriptionInQuotes(Boolean value) {
-
-      formData.put("show_description_in_quotes", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder usageAccumulationResetFrequency(
-        UsageAccumulationResetFrequency value) {
-
-      formData.put("usage_accumulation_reset_frequency", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder businessEntityId(String value) {
-
-      formData.put("business_entity_id", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder pricingModel(PricingModel value) {
-
-      formData.put("pricing_model", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder price(Long value) {
-
-      formData.put("price", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder priceInDecimal(String value) {
-
-      formData.put("price_in_decimal", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder periodUnit(PeriodUnit value) {
-
-      formData.put("period_unit", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder period(Integer value) {
-
-      formData.put("period", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder trialPeriodUnit(TrialPeriodUnit value) {
-
-      formData.put("trial_period_unit", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder trialPeriod(Integer value) {
-
-      formData.put("trial_period", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder shippingPeriod(Integer value) {
-
-      formData.put("shipping_period", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder shippingPeriodUnit(ShippingPeriodUnit value) {
-
-      formData.put("shipping_period_unit", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder trialEndAction(TrialEndAction value) {
-
-      formData.put("trial_end_action", value);
-
-      return this;
-    }
-
-    public ItemPriceCreateBuilder taxDetail(TaxDetailParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "tax_detail[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ItemPriceCreateBuilder accountingDetail(AccountingDetailParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "accounting_detail[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ItemPriceCreateBuilder tiers(List<TiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public ItemPriceCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public ItemPriceCreateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public ItemPriceCreateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ItemPriceCreateParams build() {
-      return new ItemPriceCreateParams(this);
-    }
-  }
-
-  public enum ProrationType {
-    SITE_DEFAULT("site_default"),
-
-    PARTIAL_TERM("partial_term"),
-
-    FULL_TERM("full_term"),
-
-    /** An enum member indicating that ProrationType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ProrationType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ProrationType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ProrationType enumValue : ProrationType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum UsageAccumulationResetFrequency {
-    NEVER("never"),
-
-    SUBSCRIPTION_BILLING_FREQUENCY("subscription_billing_frequency"),
-
-    /**
-     * An enum member indicating that UsageAccumulationResetFrequency was instantiated with an
-     * unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    UsageAccumulationResetFrequency(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static UsageAccumulationResetFrequency fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (UsageAccumulationResetFrequency enumValue : UsageAccumulationResetFrequency.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PricingModel {
-    FLAT_FEE("flat_fee"),
-
-    PER_UNIT("per_unit"),
-
-    TIERED("tiered"),
-
-    VOLUME("volume"),
-
-    STAIRSTEP("stairstep"),
-
-    /** An enum member indicating that PricingModel was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PricingModel(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PricingModel fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PricingModel enumValue : PricingModel.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PeriodUnit enumValue : PeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TrialPeriodUnit {
-    DAY("day"),
-
-    MONTH("month"),
-
-    /** An enum member indicating that TrialPeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TrialPeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TrialPeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TrialPeriodUnit enumValue : TrialPeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ShippingPeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that ShippingPeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ShippingPeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ShippingPeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ShippingPeriodUnit enumValue : ShippingPeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TrialEndAction {
-    SITE_DEFAULT("site_default"),
-
-    ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-    CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TrialEndAction(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TrialEndAction fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TrialEndAction enumValue : TrialEndAction.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class TaxDetailParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxDetailParams(TaxDetailBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxDetailParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxDetailBuilder builder() {
-      return new TaxDetailBuilder();
-    }
-
-    public static final class TaxDetailBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxDetailBuilder() {}
-
-      public TaxDetailBuilder taxProfileId(String value) {
-
-        formData.put("tax_profile_id", value);
-
-        return this;
-      }
-
-      public TaxDetailBuilder avalaraTaxCode(String value) {
-
-        formData.put("avalara_tax_code", value);
-
-        return this;
-      }
-
-      public TaxDetailBuilder hsnCode(String value) {
-
-        formData.put("hsn_code", value);
-
-        return this;
-      }
-
-      public TaxDetailBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public TaxDetailBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public TaxDetailBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public TaxDetailBuilder taxjarProductCode(String value) {
-
-        formData.put("taxjar_product_code", value);
-
-        return this;
-      }
-
-      public TaxDetailParams build() {
-        return new TaxDetailParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AccountingDetailParams {
-
-    private final Map<String, Object> formData;
-
-    private AccountingDetailParams(AccountingDetailBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AccountingDetailParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AccountingDetailBuilder builder() {
-      return new AccountingDetailBuilder();
-    }
-
-    public static final class AccountingDetailBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AccountingDetailBuilder() {}
-
-      public AccountingDetailBuilder sku(String value) {
-
-        formData.put("sku", value);
-
-        return this;
-      }
-
-      public AccountingDetailBuilder accountingCode(String value) {
-
-        formData.put("accounting_code", value);
-
-        return this;
-      }
-
-      public AccountingDetailBuilder accountingCategory1(String value) {
-
-        formData.put("accounting_category1", value);
-
-        return this;
-      }
-
-      public AccountingDetailBuilder accountingCategory2(String value) {
-
-        formData.put("accounting_category2", value);
-
-        return this;
-      }
-
-      public AccountingDetailBuilder accountingCategory3(String value) {
-
-        formData.put("accounting_category3", value);
-
-        return this;
-      }
-
-      public AccountingDetailBuilder accountingCategory4(String value) {
-
-        formData.put("accounting_category4", value);
-
-        return this;
-      }
-
-      public AccountingDetailParams build() {
-        return new AccountingDetailParams(this);
-      }
-    }
-  }
-
-  public static final class TiersParams {
-
-    private final Map<String, Object> formData;
-
-    private TiersParams(TiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TiersBuilder builder() {
-      return new TiersBuilder();
-    }
-
-    public static final class TiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TiersBuilder() {}
-
-      public TiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public TiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public TiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public TiersParams build() {
-        return new TiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceFindApplicableItemPricesParams.java b/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceFindApplicableItemPricesParams.java
deleted file mode 100644
index 396b28d0..00000000
--- a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceFindApplicableItemPricesParams.java
+++ /dev/null
@@ -1,178 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.itemPrice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ItemPriceFindApplicableItemPricesParams {
-
-  private final Map<String, Object> queryParams;
-
-  private ItemPriceFindApplicableItemPricesParams(
-      ItemPriceFindApplicableItemPricesBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public ItemPriceFindApplicableItemPricesBuilder toBuilder() {
-    ItemPriceFindApplicableItemPricesBuilder builder =
-        new ItemPriceFindApplicableItemPricesBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for ItemPriceFindApplicableItemPricesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ItemPriceFindApplicableItemPricesBuilder builder() {
-    return new ItemPriceFindApplicableItemPricesBuilder();
-  }
-
-  public static final class ItemPriceFindApplicableItemPricesBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private ItemPriceFindApplicableItemPricesBuilder() {}
-
-    public ItemPriceFindApplicableItemPricesBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public ItemPriceFindApplicableItemPricesBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public ItemPriceFindApplicableItemPricesBuilder itemId(String value) {
-      queryParams.put("item_id", value);
-      return this;
-    }
-
-    public SortBySortBuilder sortBy() {
-      return new SortBySortBuilder("sort_by", this);
-    }
-
-    public ItemPriceFindApplicableItemPricesParams build() {
-      return new ItemPriceFindApplicableItemPricesParams(this);
-    }
-
-    public static final class SortBySortBuilder {
-      private final String fieldName;
-      private final ItemPriceFindApplicableItemPricesBuilder builder;
-
-      SortBySortBuilder(String fieldName, ItemPriceFindApplicableItemPricesBuilder builder) {
-        this.fieldName = fieldName;
-        this.builder = builder;
-      }
-
-      public SortDirection name() {
-        return new SortDirection(fieldName, "name", builder);
-      }
-
-      public SortDirection id() {
-        return new SortDirection(fieldName, "id", builder);
-      }
-
-      public SortDirection updated_at() {
-        return new SortDirection(fieldName, "updated_at", builder);
-      }
-    }
-
-    public static final class SortDirection {
-      private final String fieldName;
-      private final String selectedField;
-      private final ItemPriceFindApplicableItemPricesBuilder builder;
-
-      SortDirection(
-          String fieldName,
-          String selectedField,
-          ItemPriceFindApplicableItemPricesBuilder builder) {
-        this.fieldName = fieldName;
-        this.selectedField = selectedField;
-        this.builder = builder;
-      }
-
-      public ItemPriceFindApplicableItemPricesBuilder asc() {
-        builder.queryParams.put(fieldName + "[asc]", selectedField);
-        return builder;
-      }
-
-      public ItemPriceFindApplicableItemPricesBuilder desc() {
-        builder.queryParams.put(fieldName + "[desc]", selectedField);
-        return builder;
-      }
-    }
-  }
-
-  public enum SortByAsc {
-    NAME("name"),
-
-    ID("id"),
-
-    UPDATED_AT("updated_at"),
-
-    /** An enum member indicating that SortByAsc was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    SortByAsc(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static SortByAsc fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (SortByAsc enumValue : SortByAsc.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum SortByDesc {
-    NAME("name"),
-
-    ID("id"),
-
-    UPDATED_AT("updated_at"),
-
-    /** An enum member indicating that SortByDesc was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    SortByDesc(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static SortByDesc fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (SortByDesc enumValue : SortByDesc.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceUpdateParams.java
deleted file mode 100644
index f0be18d5..00000000
--- a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceUpdateParams.java
+++ /dev/null
@@ -1,913 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.itemPrice.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class ItemPriceUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private ItemPriceUpdateParams(ItemPriceUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ItemPriceUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ItemPriceUpdateBuilder builder() {
-    return new ItemPriceUpdateBuilder();
-  }
-
-  public static final class ItemPriceUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ItemPriceUpdateBuilder() {}
-
-    public ItemPriceUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder prorationType(ProrationType value) {
-
-      formData.put("proration_type", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder priceVariantId(String value) {
-
-      formData.put("price_variant_id", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder externalName(String value) {
-
-      formData.put("external_name", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder usageAccumulationResetFrequency(
-        UsageAccumulationResetFrequency value) {
-
-      formData.put("usage_accumulation_reset_frequency", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder isTaxable(Boolean value) {
-
-      formData.put("is_taxable", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder freeQuantity(Integer value) {
-
-      formData.put("free_quantity", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder freeQuantityInDecimal(String value) {
-
-      formData.put("free_quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder metadata(java.util.Map<String, Object> value) {
-
-      formData.put("metadata", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder pricingModel(PricingModel value) {
-
-      formData.put("pricing_model", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder price(Long value) {
-
-      formData.put("price", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder priceInDecimal(String value) {
-
-      formData.put("price_in_decimal", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder periodUnit(PeriodUnit value) {
-
-      formData.put("period_unit", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder period(Integer value) {
-
-      formData.put("period", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder trialPeriodUnit(TrialPeriodUnit value) {
-
-      formData.put("trial_period_unit", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder trialPeriod(Integer value) {
-
-      formData.put("trial_period", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder shippingPeriod(Integer value) {
-
-      formData.put("shipping_period", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder shippingPeriodUnit(ShippingPeriodUnit value) {
-
-      formData.put("shipping_period_unit", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder trialEndAction(TrialEndAction value) {
-
-      formData.put("trial_end_action", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder showDescriptionInInvoices(Boolean value) {
-
-      formData.put("show_description_in_invoices", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder showDescriptionInQuotes(Boolean value) {
-
-      formData.put("show_description_in_quotes", value);
-
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder taxDetail(TaxDetailParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "tax_detail[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder accountingDetail(AccountingDetailParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "accounting_detail[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder tiers(List<TiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public ItemPriceUpdateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public ItemPriceUpdateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public ItemPriceUpdateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ItemPriceUpdateParams build() {
-      return new ItemPriceUpdateParams(this);
-    }
-  }
-
-  public enum ProrationType {
-    SITE_DEFAULT("site_default"),
-
-    PARTIAL_TERM("partial_term"),
-
-    FULL_TERM("full_term"),
-
-    /** An enum member indicating that ProrationType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ProrationType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ProrationType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ProrationType enumValue : ProrationType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Status {
-    ACTIVE("active"),
-
-    ARCHIVED("archived"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum UsageAccumulationResetFrequency {
-    NEVER("never"),
-
-    SUBSCRIPTION_BILLING_FREQUENCY("subscription_billing_frequency"),
-
-    /**
-     * An enum member indicating that UsageAccumulationResetFrequency was instantiated with an
-     * unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    UsageAccumulationResetFrequency(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static UsageAccumulationResetFrequency fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (UsageAccumulationResetFrequency enumValue : UsageAccumulationResetFrequency.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PricingModel {
-    FLAT_FEE("flat_fee"),
-
-    PER_UNIT("per_unit"),
-
-    TIERED("tiered"),
-
-    VOLUME("volume"),
-
-    STAIRSTEP("stairstep"),
-
-    /** An enum member indicating that PricingModel was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PricingModel(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PricingModel fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PricingModel enumValue : PricingModel.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PeriodUnit enumValue : PeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TrialPeriodUnit {
-    DAY("day"),
-
-    MONTH("month"),
-
-    /** An enum member indicating that TrialPeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TrialPeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TrialPeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TrialPeriodUnit enumValue : TrialPeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ShippingPeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that ShippingPeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ShippingPeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ShippingPeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ShippingPeriodUnit enumValue : ShippingPeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TrialEndAction {
-    SITE_DEFAULT("site_default"),
-
-    ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-    CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TrialEndAction(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TrialEndAction fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TrialEndAction enumValue : TrialEndAction.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class TaxDetailParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxDetailParams(TaxDetailBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxDetailParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxDetailBuilder builder() {
-      return new TaxDetailBuilder();
-    }
-
-    public static final class TaxDetailBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxDetailBuilder() {}
-
-      public TaxDetailBuilder taxProfileId(String value) {
-
-        formData.put("tax_profile_id", value);
-
-        return this;
-      }
-
-      public TaxDetailBuilder avalaraTaxCode(String value) {
-
-        formData.put("avalara_tax_code", value);
-
-        return this;
-      }
-
-      public TaxDetailBuilder hsnCode(String value) {
-
-        formData.put("hsn_code", value);
-
-        return this;
-      }
-
-      public TaxDetailBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public TaxDetailBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public TaxDetailBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public TaxDetailBuilder taxjarProductCode(String value) {
-
-        formData.put("taxjar_product_code", value);
-
-        return this;
-      }
-
-      public TaxDetailParams build() {
-        return new TaxDetailParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AccountingDetailParams {
-
-    private final Map<String, Object> formData;
-
-    private AccountingDetailParams(AccountingDetailBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AccountingDetailParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AccountingDetailBuilder builder() {
-      return new AccountingDetailBuilder();
-    }
-
-    public static final class AccountingDetailBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AccountingDetailBuilder() {}
-
-      public AccountingDetailBuilder sku(String value) {
-
-        formData.put("sku", value);
-
-        return this;
-      }
-
-      public AccountingDetailBuilder accountingCode(String value) {
-
-        formData.put("accounting_code", value);
-
-        return this;
-      }
-
-      public AccountingDetailBuilder accountingCategory1(String value) {
-
-        formData.put("accounting_category1", value);
-
-        return this;
-      }
-
-      public AccountingDetailBuilder accountingCategory2(String value) {
-
-        formData.put("accounting_category2", value);
-
-        return this;
-      }
-
-      public AccountingDetailBuilder accountingCategory3(String value) {
-
-        formData.put("accounting_category3", value);
-
-        return this;
-      }
-
-      public AccountingDetailBuilder accountingCategory4(String value) {
-
-        formData.put("accounting_category4", value);
-
-        return this;
-      }
-
-      public AccountingDetailParams build() {
-        return new AccountingDetailParams(this);
-      }
-    }
-  }
-
-  public static final class TiersParams {
-
-    private final Map<String, Object> formData;
-
-    private TiersParams(TiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TiersBuilder builder() {
-      return new TiersBuilder();
-    }
-
-    public static final class TiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TiersBuilder() {}
-
-      public TiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public TiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public TiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public TiersParams build() {
-        return new TiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/media/params/MediaCreateMediaAndAttachToItemParams.java b/src/main/java/com/chargebee/v4/core/models/media/params/MediaCreateMediaAndAttachToItemParams.java
deleted file mode 100644
index 1ebc16ff..00000000
--- a/src/main/java/com/chargebee/v4/core/models/media/params/MediaCreateMediaAndAttachToItemParams.java
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.media.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class MediaCreateMediaAndAttachToItemParams {
-
-  private final Map<String, Object> formData;
-
-  private MediaCreateMediaAndAttachToItemParams(MediaCreateMediaAndAttachToItemBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for MediaCreateMediaAndAttachToItemParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static MediaCreateMediaAndAttachToItemBuilder builder() {
-    return new MediaCreateMediaAndAttachToItemBuilder();
-  }
-
-  public static final class MediaCreateMediaAndAttachToItemBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private MediaCreateMediaAndAttachToItemBuilder() {}
-
-    public MediaCreateMediaAndAttachToItemBuilder url(String value) {
-
-      formData.put("url", value);
-
-      return this;
-    }
-
-    public MediaCreateMediaAndAttachToItemBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public MediaCreateMediaAndAttachToItemBuilder altText(String value) {
-
-      formData.put("alt_text", value);
-
-      return this;
-    }
-
-    public MediaCreateMediaAndAttachToItemParams build() {
-      return new MediaCreateMediaAndAttachToItemParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/nonSubscription/params/NonSubscriptionProcessReceiptParams.java b/src/main/java/com/chargebee/v4/core/models/nonSubscription/params/NonSubscriptionProcessReceiptParams.java
deleted file mode 100644
index 818e0f7d..00000000
--- a/src/main/java/com/chargebee/v4/core/models/nonSubscription/params/NonSubscriptionProcessReceiptParams.java
+++ /dev/null
@@ -1,232 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.nonSubscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class NonSubscriptionProcessReceiptParams {
-
-  private final Map<String, Object> formData;
-
-  private NonSubscriptionProcessReceiptParams(NonSubscriptionProcessReceiptBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for NonSubscriptionProcessReceiptParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static NonSubscriptionProcessReceiptBuilder builder() {
-    return new NonSubscriptionProcessReceiptBuilder();
-  }
-
-  public static final class NonSubscriptionProcessReceiptBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private NonSubscriptionProcessReceiptBuilder() {}
-
-    public NonSubscriptionProcessReceiptBuilder receipt(String value) {
-
-      formData.put("receipt", value);
-
-      return this;
-    }
-
-    public NonSubscriptionProcessReceiptBuilder product(ProductParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "product[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public NonSubscriptionProcessReceiptBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public NonSubscriptionProcessReceiptParams build() {
-      return new NonSubscriptionProcessReceiptParams(this);
-    }
-  }
-
-  public static final class ProductParams {
-
-    private final Map<String, Object> formData;
-
-    private ProductParams(ProductBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ProductParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ProductBuilder builder() {
-      return new ProductBuilder();
-    }
-
-    public static final class ProductBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ProductBuilder() {}
-
-      public ProductBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public ProductBuilder currencyCode(String value) {
-
-        formData.put("currency_code", value);
-
-        return this;
-      }
-
-      public ProductBuilder price(Integer value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ProductBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      public ProductBuilder name(String value) {
-
-        formData.put("name", value);
-
-        return this;
-      }
-
-      public ProductBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ProductParams build() {
-        return new ProductParams(this);
-      }
-    }
-
-    public enum Type {
-      CONSUMABLE("consumable"),
-
-      NON_CONSUMABLE("non_consumable"),
-
-      NON_RENEWING_SUBSCRIPTION("non_renewing_subscription"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public CustomerBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/offerEvent/params/OfferEventOfferEventsParams.java b/src/main/java/com/chargebee/v4/core/models/offerEvent/params/OfferEventOfferEventsParams.java
deleted file mode 100644
index fda3d3f0..00000000
--- a/src/main/java/com/chargebee/v4/core/models/offerEvent/params/OfferEventOfferEventsParams.java
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.offerEvent.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class OfferEventOfferEventsParams {
-
-  private final Map<String, Object> formData;
-
-  private OfferEventOfferEventsParams(OfferEventOfferEventsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for OfferEventOfferEventsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OfferEventOfferEventsBuilder builder() {
-    return new OfferEventOfferEventsBuilder();
-  }
-
-  public static final class OfferEventOfferEventsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private OfferEventOfferEventsBuilder() {}
-
-    public OfferEventOfferEventsBuilder personalizedOfferId(String value) {
-
-      formData.put("personalized_offer_id", value);
-
-      return this;
-    }
-
-    public OfferEventOfferEventsBuilder type(Type value) {
-
-      formData.put("type", value);
-
-      return this;
-    }
-
-    public OfferEventOfferEventsParams build() {
-      return new OfferEventOfferEventsParams(this);
-    }
-  }
-
-  public enum Type {
-    VIEWED("viewed"),
-
-    DISMISSED("dismissed"),
-
-    /** An enum member indicating that Type was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Type(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Type fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Type enumValue : Type.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/offerFulfillment/params/OfferFulfillmentOfferFulfillmentsGetParams.java b/src/main/java/com/chargebee/v4/core/models/offerFulfillment/params/OfferFulfillmentOfferFulfillmentsGetParams.java
deleted file mode 100644
index 51f97e39..00000000
--- a/src/main/java/com/chargebee/v4/core/models/offerFulfillment/params/OfferFulfillmentOfferFulfillmentsGetParams.java
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.offerFulfillment.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class OfferFulfillmentOfferFulfillmentsGetParams {
-
-  private final Map<String, Object> queryParams;
-
-  private OfferFulfillmentOfferFulfillmentsGetParams(
-      OfferFulfillmentOfferFulfillmentsGetBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public OfferFulfillmentOfferFulfillmentsGetBuilder toBuilder() {
-    OfferFulfillmentOfferFulfillmentsGetBuilder builder =
-        new OfferFulfillmentOfferFulfillmentsGetBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for OfferFulfillmentOfferFulfillmentsGetParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OfferFulfillmentOfferFulfillmentsGetBuilder builder() {
-    return new OfferFulfillmentOfferFulfillmentsGetBuilder();
-  }
-
-  public static final class OfferFulfillmentOfferFulfillmentsGetBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private OfferFulfillmentOfferFulfillmentsGetBuilder() {}
-
-    public OfferFulfillmentOfferFulfillmentsGetParams build() {
-      return new OfferFulfillmentOfferFulfillmentsGetParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/offerFulfillment/params/OfferFulfillmentOfferFulfillmentsParams.java b/src/main/java/com/chargebee/v4/core/models/offerFulfillment/params/OfferFulfillmentOfferFulfillmentsParams.java
deleted file mode 100644
index 916fd849..00000000
--- a/src/main/java/com/chargebee/v4/core/models/offerFulfillment/params/OfferFulfillmentOfferFulfillmentsParams.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.offerFulfillment.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class OfferFulfillmentOfferFulfillmentsParams {
-
-  private final Map<String, Object> formData;
-
-  private OfferFulfillmentOfferFulfillmentsParams(
-      OfferFulfillmentOfferFulfillmentsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for OfferFulfillmentOfferFulfillmentsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OfferFulfillmentOfferFulfillmentsBuilder builder() {
-    return new OfferFulfillmentOfferFulfillmentsBuilder();
-  }
-
-  public static final class OfferFulfillmentOfferFulfillmentsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private OfferFulfillmentOfferFulfillmentsBuilder() {}
-
-    public OfferFulfillmentOfferFulfillmentsBuilder personalizedOfferId(String value) {
-
-      formData.put("personalized_offer_id", value);
-
-      return this;
-    }
-
-    public OfferFulfillmentOfferFulfillmentsBuilder optionId(String value) {
-
-      formData.put("option_id", value);
-
-      return this;
-    }
-
-    public OfferFulfillmentOfferFulfillmentsParams build() {
-      return new OfferFulfillmentOfferFulfillmentsParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/offerFulfillment/params/OfferFulfillmentOfferFulfillmentsUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/offerFulfillment/params/OfferFulfillmentOfferFulfillmentsUpdateParams.java
deleted file mode 100644
index c93463e4..00000000
--- a/src/main/java/com/chargebee/v4/core/models/offerFulfillment/params/OfferFulfillmentOfferFulfillmentsUpdateParams.java
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.offerFulfillment.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class OfferFulfillmentOfferFulfillmentsUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private OfferFulfillmentOfferFulfillmentsUpdateParams(
-      OfferFulfillmentOfferFulfillmentsUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for OfferFulfillmentOfferFulfillmentsUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OfferFulfillmentOfferFulfillmentsUpdateBuilder builder() {
-    return new OfferFulfillmentOfferFulfillmentsUpdateBuilder();
-  }
-
-  public static final class OfferFulfillmentOfferFulfillmentsUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private OfferFulfillmentOfferFulfillmentsUpdateBuilder() {}
-
-    public OfferFulfillmentOfferFulfillmentsUpdateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public OfferFulfillmentOfferFulfillmentsUpdateBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public OfferFulfillmentOfferFulfillmentsUpdateBuilder failureReason(String value) {
-
-      formData.put("failure_reason", value);
-
-      return this;
-    }
-
-    public OfferFulfillmentOfferFulfillmentsUpdateParams build() {
-      return new OfferFulfillmentOfferFulfillmentsUpdateParams(this);
-    }
-  }
-
-  public enum Status {
-    COMPLETED("completed"),
-
-    FAILED("failed"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/params/OmnichannelSubscriptionMoveParams.java b/src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/params/OmnichannelSubscriptionMoveParams.java
deleted file mode 100644
index 824fee95..00000000
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/params/OmnichannelSubscriptionMoveParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.omnichannelSubscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class OmnichannelSubscriptionMoveParams {
-
-  private final Map<String, Object> formData;
-
-  private OmnichannelSubscriptionMoveParams(OmnichannelSubscriptionMoveBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for OmnichannelSubscriptionMoveParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OmnichannelSubscriptionMoveBuilder builder() {
-    return new OmnichannelSubscriptionMoveBuilder();
-  }
-
-  public static final class OmnichannelSubscriptionMoveBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private OmnichannelSubscriptionMoveBuilder() {}
-
-    public OmnichannelSubscriptionMoveBuilder toCustomerId(String value) {
-
-      formData.put("to_customer_id", value);
-
-      return this;
-    }
-
-    public OmnichannelSubscriptionMoveParams build() {
-      return new OmnichannelSubscriptionMoveParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/params/OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/params/OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams.java
deleted file mode 100644
index 15857ef2..00000000
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/params/OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams.java
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.omnichannelSubscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams {
-
-  private final Map<String, Object> queryParams;
-
-  private OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams(
-      OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionBuilder
-      toBuilder() {
-    OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionBuilder builder =
-        new OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /**
-   * Create a new builder for
-   * OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams.
-   */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionBuilder
-      builder() {
-    return new OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionBuilder();
-  }
-
-  public static final
-  class OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionBuilder() {}
-
-    public OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionBuilder limit(
-        Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionBuilder offset(
-        String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams build() {
-      return new OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams(
-          this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItem/params/OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams.java b/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItem/params/OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams.java
deleted file mode 100644
index 5a4bb81a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItem/params/OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams.java
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.omnichannelSubscriptionItem.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams {
-
-  private final Map<String, Object> queryParams;
-
-  private OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams(
-      OmnichannelSubscriptionItemListOmniSubItemScheduleChangesBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public OmnichannelSubscriptionItemListOmniSubItemScheduleChangesBuilder toBuilder() {
-    OmnichannelSubscriptionItemListOmniSubItemScheduleChangesBuilder builder =
-        new OmnichannelSubscriptionItemListOmniSubItemScheduleChangesBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OmnichannelSubscriptionItemListOmniSubItemScheduleChangesBuilder builder() {
-    return new OmnichannelSubscriptionItemListOmniSubItemScheduleChangesBuilder();
-  }
-
-  public static final class OmnichannelSubscriptionItemListOmniSubItemScheduleChangesBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private OmnichannelSubscriptionItemListOmniSubItemScheduleChangesBuilder() {}
-
-    public OmnichannelSubscriptionItemListOmniSubItemScheduleChangesBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public OmnichannelSubscriptionItemListOmniSubItemScheduleChangesBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams build() {
-      return new OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/order/params/OrderAssignOrderNumberParams.java b/src/main/java/com/chargebee/v4/core/models/order/params/OrderAssignOrderNumberParams.java
deleted file mode 100644
index 78725ae7..00000000
--- a/src/main/java/com/chargebee/v4/core/models/order/params/OrderAssignOrderNumberParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.order.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class OrderAssignOrderNumberParams {
-
-  private final Map<String, Object> formData;
-
-  private OrderAssignOrderNumberParams(OrderAssignOrderNumberBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for OrderAssignOrderNumberParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OrderAssignOrderNumberBuilder builder() {
-    return new OrderAssignOrderNumberBuilder();
-  }
-
-  public static final class OrderAssignOrderNumberBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private OrderAssignOrderNumberBuilder() {}
-
-    public OrderAssignOrderNumberParams build() {
-      return new OrderAssignOrderNumberParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/order/params/OrderCancelParams.java b/src/main/java/com/chargebee/v4/core/models/order/params/OrderCancelParams.java
deleted file mode 100644
index 5f3a9703..00000000
--- a/src/main/java/com/chargebee/v4/core/models/order/params/OrderCancelParams.java
+++ /dev/null
@@ -1,172 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.order.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class OrderCancelParams {
-
-  private final Map<String, Object> formData;
-
-  private OrderCancelParams(OrderCancelBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for OrderCancelParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OrderCancelBuilder builder() {
-    return new OrderCancelBuilder();
-  }
-
-  public static final class OrderCancelBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private OrderCancelBuilder() {}
-
-    public OrderCancelBuilder cancellationReason(CancellationReason value) {
-
-      formData.put("cancellation_reason", value);
-
-      return this;
-    }
-
-    public OrderCancelBuilder customerNotes(String value) {
-
-      formData.put("customer_notes", value);
-
-      return this;
-    }
-
-    public OrderCancelBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public OrderCancelBuilder cancelledAt(Timestamp value) {
-
-      formData.put("cancelled_at", value);
-
-      return this;
-    }
-
-    public OrderCancelBuilder creditNote(CreditNoteParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "credit_note[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public OrderCancelParams build() {
-      return new OrderCancelParams(this);
-    }
-  }
-
-  public enum CancellationReason {
-    SHIPPING_CUT_OFF_PASSED("shipping_cut_off_passed"),
-
-    PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
-
-    THIRD_PARTY_CANCELLATION("third_party_cancellation"),
-
-    PRODUCT_NOT_REQUIRED("product_not_required"),
-
-    DELIVERY_DATE_MISSED("delivery_date_missed"),
-
-    ALTERNATIVE_FOUND("alternative_found"),
-
-    INVOICE_WRITTEN_OFF("invoice_written_off"),
-
-    INVOICE_VOIDED("invoice_voided"),
-
-    FRAUDULENT_TRANSACTION("fraudulent_transaction"),
-
-    PAYMENT_DECLINED("payment_declined"),
-
-    SUBSCRIPTION_CANCELLED("subscription_cancelled"),
-
-    PRODUCT_NOT_AVAILABLE("product_not_available"),
-
-    OTHERS("others"),
-
-    ORDER_RESENT("order_resent"),
-
-    /** An enum member indicating that CancellationReason was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CancellationReason(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CancellationReason fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CancellationReason enumValue : CancellationReason.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class CreditNoteParams {
-
-    private final Map<String, Object> formData;
-
-    private CreditNoteParams(CreditNoteBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreditNoteParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreditNoteBuilder builder() {
-      return new CreditNoteBuilder();
-    }
-
-    public static final class CreditNoteBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreditNoteBuilder() {}
-
-      public CreditNoteBuilder total(Long value) {
-
-        formData.put("total", value);
-
-        return this;
-      }
-
-      public CreditNoteParams build() {
-        return new CreditNoteParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/order/params/OrderCreateParams.java b/src/main/java/com/chargebee/v4/core/models/order/params/OrderCreateParams.java
deleted file mode 100644
index b8d473d9..00000000
--- a/src/main/java/com/chargebee/v4/core/models/order/params/OrderCreateParams.java
+++ /dev/null
@@ -1,140 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.order.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class OrderCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private OrderCreateParams(OrderCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for OrderCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OrderCreateBuilder builder() {
-    return new OrderCreateBuilder();
-  }
-
-  public static final class OrderCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private OrderCreateBuilder() {}
-
-    public OrderCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public OrderCreateBuilder invoiceId(String value) {
-
-      formData.put("invoice_id", value);
-
-      return this;
-    }
-
-    public OrderCreateBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public OrderCreateBuilder referenceId(String value) {
-
-      formData.put("reference_id", value);
-
-      return this;
-    }
-
-    public OrderCreateBuilder fulfillmentStatus(String value) {
-
-      formData.put("fulfillment_status", value);
-
-      return this;
-    }
-
-    public OrderCreateBuilder note(String value) {
-
-      formData.put("note", value);
-
-      return this;
-    }
-
-    public OrderCreateBuilder trackingId(String value) {
-
-      formData.put("tracking_id", value);
-
-      return this;
-    }
-
-    public OrderCreateBuilder trackingUrl(String value) {
-
-      formData.put("tracking_url", value);
-
-      return this;
-    }
-
-    public OrderCreateBuilder batchId(String value) {
-
-      formData.put("batch_id", value);
-
-      return this;
-    }
-
-    public OrderCreateParams build() {
-      return new OrderCreateParams(this);
-    }
-  }
-
-  public enum Status {
-    NEW("new"),
-
-    PROCESSING("processing"),
-
-    COMPLETE("complete"),
-
-    CANCELLED("cancelled"),
-
-    VOIDED("voided"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/order/params/OrderCreateRefundableCreditNoteParams.java b/src/main/java/com/chargebee/v4/core/models/order/params/OrderCreateRefundableCreditNoteParams.java
deleted file mode 100644
index 3b5a1654..00000000
--- a/src/main/java/com/chargebee/v4/core/models/order/params/OrderCreateRefundableCreditNoteParams.java
+++ /dev/null
@@ -1,160 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.order.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class OrderCreateRefundableCreditNoteParams {
-
-  private final Map<String, Object> formData;
-
-  private OrderCreateRefundableCreditNoteParams(OrderCreateRefundableCreditNoteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for OrderCreateRefundableCreditNoteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OrderCreateRefundableCreditNoteBuilder builder() {
-    return new OrderCreateRefundableCreditNoteBuilder();
-  }
-
-  public static final class OrderCreateRefundableCreditNoteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private OrderCreateRefundableCreditNoteBuilder() {}
-
-    public OrderCreateRefundableCreditNoteBuilder customerNotes(String value) {
-
-      formData.put("customer_notes", value);
-
-      return this;
-    }
-
-    public OrderCreateRefundableCreditNoteBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public OrderCreateRefundableCreditNoteBuilder creditNote(CreditNoteParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "credit_note[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public OrderCreateRefundableCreditNoteParams build() {
-      return new OrderCreateRefundableCreditNoteParams(this);
-    }
-  }
-
-  public static final class CreditNoteParams {
-
-    private final Map<String, Object> formData;
-
-    private CreditNoteParams(CreditNoteBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CreditNoteParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CreditNoteBuilder builder() {
-      return new CreditNoteBuilder();
-    }
-
-    public static final class CreditNoteBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CreditNoteBuilder() {}
-
-      public CreditNoteBuilder reasonCode(ReasonCode value) {
-
-        formData.put("reason_code", value);
-
-        return this;
-      }
-
-      public CreditNoteBuilder total(Long value) {
-
-        formData.put("total", value);
-
-        return this;
-      }
-
-      public CreditNoteParams build() {
-        return new CreditNoteParams(this);
-      }
-    }
-
-    public enum ReasonCode {
-      WRITE_OFF("write_off"),
-
-      SUBSCRIPTION_CHANGE("subscription_change"),
-
-      SUBSCRIPTION_CANCELLATION("subscription_cancellation"),
-
-      SUBSCRIPTION_PAUSE("subscription_pause"),
-
-      CHARGEBACK("chargeback"),
-
-      PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
-
-      SERVICE_UNSATISFACTORY("service_unsatisfactory"),
-
-      ORDER_CHANGE("order_change"),
-
-      ORDER_CANCELLATION("order_cancellation"),
-
-      WAIVER("waiver"),
-
-      OTHER("other"),
-
-      FRAUDULENT("fraudulent"),
-
-      /** An enum member indicating that ReasonCode was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ReasonCode(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ReasonCode fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ReasonCode enumValue : ReasonCode.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/order/params/OrderDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/order/params/OrderDeleteParams.java
deleted file mode 100644
index d752f316..00000000
--- a/src/main/java/com/chargebee/v4/core/models/order/params/OrderDeleteParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.order.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class OrderDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private OrderDeleteParams(OrderDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for OrderDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OrderDeleteBuilder builder() {
-    return new OrderDeleteBuilder();
-  }
-
-  public static final class OrderDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private OrderDeleteBuilder() {}
-
-    public OrderDeleteParams build() {
-      return new OrderDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/order/params/OrderImportOrderParams.java b/src/main/java/com/chargebee/v4/core/models/order/params/OrderImportOrderParams.java
deleted file mode 100644
index 2583534d..00000000
--- a/src/main/java/com/chargebee/v4/core/models/order/params/OrderImportOrderParams.java
+++ /dev/null
@@ -1,632 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.order.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class OrderImportOrderParams {
-
-  private final Map<String, Object> formData;
-
-  private OrderImportOrderParams(OrderImportOrderBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for OrderImportOrderParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OrderImportOrderBuilder builder() {
-    return new OrderImportOrderBuilder();
-  }
-
-  public static final class OrderImportOrderBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private OrderImportOrderBuilder() {}
-
-    public OrderImportOrderBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder documentNumber(String value) {
-
-      formData.put("document_number", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder invoiceId(String value) {
-
-      formData.put("invoice_id", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder createdAt(Timestamp value) {
-
-      formData.put("created_at", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder orderDate(Timestamp value) {
-
-      formData.put("order_date", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder shippingDate(Timestamp value) {
-
-      formData.put("shipping_date", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder referenceId(String value) {
-
-      formData.put("reference_id", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder fulfillmentStatus(String value) {
-
-      formData.put("fulfillment_status", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder note(String value) {
-
-      formData.put("note", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder trackingId(String value) {
-
-      formData.put("tracking_id", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder trackingUrl(String value) {
-
-      formData.put("tracking_url", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder batchId(String value) {
-
-      formData.put("batch_id", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder shipmentCarrier(String value) {
-
-      formData.put("shipment_carrier", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder shippingCutOffDate(Timestamp value) {
-
-      formData.put("shipping_cut_off_date", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder deliveredAt(Timestamp value) {
-
-      formData.put("delivered_at", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder shippedAt(Timestamp value) {
-
-      formData.put("shipped_at", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder cancelledAt(Timestamp value) {
-
-      formData.put("cancelled_at", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder cancellationReason(CancellationReason value) {
-
-      formData.put("cancellation_reason", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder refundableCreditsIssued(Long value) {
-
-      formData.put("refundable_credits_issued", value);
-
-      return this;
-    }
-
-    public OrderImportOrderBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public OrderImportOrderBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public OrderImportOrderParams build() {
-      return new OrderImportOrderParams(this);
-    }
-  }
-
-  public enum Status {
-    CANCELLED("cancelled"),
-
-    QUEUED("queued"),
-
-    AWAITING_SHIPMENT("awaiting_shipment"),
-
-    ON_HOLD("on_hold"),
-
-    DELIVERED("delivered"),
-
-    SHIPPED("shipped"),
-
-    PARTIALLY_DELIVERED("partially_delivered"),
-
-    RETURNED("returned"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum CancellationReason {
-    SHIPPING_CUT_OFF_PASSED("shipping_cut_off_passed"),
-
-    PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
-
-    THIRD_PARTY_CANCELLATION("third_party_cancellation"),
-
-    PRODUCT_NOT_REQUIRED("product_not_required"),
-
-    DELIVERY_DATE_MISSED("delivery_date_missed"),
-
-    ALTERNATIVE_FOUND("alternative_found"),
-
-    INVOICE_WRITTEN_OFF("invoice_written_off"),
-
-    INVOICE_VOIDED("invoice_voided"),
-
-    FRAUDULENT_TRANSACTION("fraudulent_transaction"),
-
-    PAYMENT_DECLINED("payment_declined"),
-
-    SUBSCRIPTION_CANCELLED("subscription_cancelled"),
-
-    PRODUCT_NOT_AVAILABLE("product_not_available"),
-
-    OTHERS("others"),
-
-    ORDER_RESENT("order_resent"),
-
-    /** An enum member indicating that CancellationReason was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CancellationReason(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CancellationReason fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CancellationReason enumValue : CancellationReason.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/order/params/OrderOrdersForInvoiceParams.java b/src/main/java/com/chargebee/v4/core/models/order/params/OrderOrdersForInvoiceParams.java
deleted file mode 100644
index 595d9dbd..00000000
--- a/src/main/java/com/chargebee/v4/core/models/order/params/OrderOrdersForInvoiceParams.java
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.order.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class OrderOrdersForInvoiceParams {
-
-  private final Map<String, Object> queryParams;
-
-  private OrderOrdersForInvoiceParams(OrderOrdersForInvoiceBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public OrderOrdersForInvoiceBuilder toBuilder() {
-    OrderOrdersForInvoiceBuilder builder = new OrderOrdersForInvoiceBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for OrderOrdersForInvoiceParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OrderOrdersForInvoiceBuilder builder() {
-    return new OrderOrdersForInvoiceBuilder();
-  }
-
-  public static final class OrderOrdersForInvoiceBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private OrderOrdersForInvoiceBuilder() {}
-
-    public OrderOrdersForInvoiceBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public OrderOrdersForInvoiceBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public OrderOrdersForInvoiceParams build() {
-      return new OrderOrdersForInvoiceParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/order/params/OrderReopenParams.java b/src/main/java/com/chargebee/v4/core/models/order/params/OrderReopenParams.java
deleted file mode 100644
index 25296bf4..00000000
--- a/src/main/java/com/chargebee/v4/core/models/order/params/OrderReopenParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.order.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class OrderReopenParams {
-
-  private final Map<String, Object> formData;
-
-  private OrderReopenParams(OrderReopenBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for OrderReopenParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OrderReopenBuilder builder() {
-    return new OrderReopenBuilder();
-  }
-
-  public static final class OrderReopenBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private OrderReopenBuilder() {}
-
-    public OrderReopenBuilder voidCancellationCreditNotes(Boolean value) {
-
-      formData.put("void_cancellation_credit_notes", value);
-
-      return this;
-    }
-
-    public OrderReopenParams build() {
-      return new OrderReopenParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/order/params/OrderResendParams.java b/src/main/java/com/chargebee/v4/core/models/order/params/OrderResendParams.java
deleted file mode 100644
index 563a9845..00000000
--- a/src/main/java/com/chargebee/v4/core/models/order/params/OrderResendParams.java
+++ /dev/null
@@ -1,119 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.order.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class OrderResendParams {
-
-  private final Map<String, Object> formData;
-
-  private OrderResendParams(OrderResendBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for OrderResendParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OrderResendBuilder builder() {
-    return new OrderResendBuilder();
-  }
-
-  public static final class OrderResendBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private OrderResendBuilder() {}
-
-    public OrderResendBuilder shippingDate(Timestamp value) {
-
-      formData.put("shipping_date", value);
-
-      return this;
-    }
-
-    public OrderResendBuilder resendReason(String value) {
-
-      formData.put("resend_reason", value);
-
-      return this;
-    }
-
-    public OrderResendBuilder orderLineItems(List<OrderLineItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          OrderLineItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "order_line_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public OrderResendParams build() {
-      return new OrderResendParams(this);
-    }
-  }
-
-  public static final class OrderLineItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private OrderLineItemsParams(OrderLineItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for OrderLineItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static OrderLineItemsBuilder builder() {
-      return new OrderLineItemsBuilder();
-    }
-
-    public static final class OrderLineItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private OrderLineItemsBuilder() {}
-
-      public OrderLineItemsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public OrderLineItemsBuilder fulfillmentQuantity(Integer value) {
-
-        formData.put("fulfillment_quantity", value);
-
-        return this;
-      }
-
-      public OrderLineItemsParams build() {
-        return new OrderLineItemsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/order/params/OrderUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/order/params/OrderUpdateParams.java
deleted file mode 100644
index 5897c7bb..00000000
--- a/src/main/java/com/chargebee/v4/core/models/order/params/OrderUpdateParams.java
+++ /dev/null
@@ -1,521 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.order.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class OrderUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private OrderUpdateParams(OrderUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for OrderUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static OrderUpdateBuilder builder() {
-    return new OrderUpdateBuilder();
-  }
-
-  public static final class OrderUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private OrderUpdateBuilder() {}
-
-    public OrderUpdateBuilder referenceId(String value) {
-
-      formData.put("reference_id", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder batchId(String value) {
-
-      formData.put("batch_id", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder note(String value) {
-
-      formData.put("note", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder shippingDate(Timestamp value) {
-
-      formData.put("shipping_date", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder orderDate(Timestamp value) {
-
-      formData.put("order_date", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder cancelledAt(Timestamp value) {
-
-      formData.put("cancelled_at", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder cancellationReason(CancellationReason value) {
-
-      formData.put("cancellation_reason", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder shippedAt(Timestamp value) {
-
-      formData.put("shipped_at", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder deliveredAt(Timestamp value) {
-
-      formData.put("delivered_at", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder trackingUrl(String value) {
-
-      formData.put("tracking_url", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder trackingId(String value) {
-
-      formData.put("tracking_id", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder shipmentCarrier(String value) {
-
-      formData.put("shipment_carrier", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder fulfillmentStatus(String value) {
-
-      formData.put("fulfillment_status", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public OrderUpdateBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public OrderUpdateBuilder orderLineItems(List<OrderLineItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          OrderLineItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "order_line_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public OrderUpdateParams build() {
-      return new OrderUpdateParams(this);
-    }
-  }
-
-  public enum CancellationReason {
-    SHIPPING_CUT_OFF_PASSED("shipping_cut_off_passed"),
-
-    PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
-
-    THIRD_PARTY_CANCELLATION("third_party_cancellation"),
-
-    PRODUCT_NOT_REQUIRED("product_not_required"),
-
-    DELIVERY_DATE_MISSED("delivery_date_missed"),
-
-    ALTERNATIVE_FOUND("alternative_found"),
-
-    INVOICE_WRITTEN_OFF("invoice_written_off"),
-
-    INVOICE_VOIDED("invoice_voided"),
-
-    FRAUDULENT_TRANSACTION("fraudulent_transaction"),
-
-    PAYMENT_DECLINED("payment_declined"),
-
-    SUBSCRIPTION_CANCELLED("subscription_cancelled"),
-
-    PRODUCT_NOT_AVAILABLE("product_not_available"),
-
-    OTHERS("others"),
-
-    ORDER_RESENT("order_resent"),
-
-    /** An enum member indicating that CancellationReason was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CancellationReason(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CancellationReason fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CancellationReason enumValue : CancellationReason.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Status {
-    NEW("new"),
-
-    PROCESSING("processing"),
-
-    COMPLETE("complete"),
-
-    CANCELLED("cancelled"),
-
-    VOIDED("voided"),
-
-    QUEUED("queued"),
-
-    AWAITING_SHIPMENT("awaiting_shipment"),
-
-    ON_HOLD("on_hold"),
-
-    DELIVERED("delivered"),
-
-    SHIPPED("shipped"),
-
-    PARTIALLY_DELIVERED("partially_delivered"),
-
-    RETURNED("returned"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class OrderLineItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private OrderLineItemsParams(OrderLineItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for OrderLineItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static OrderLineItemsBuilder builder() {
-      return new OrderLineItemsBuilder();
-    }
-
-    public static final class OrderLineItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private OrderLineItemsBuilder() {}
-
-      public OrderLineItemsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public OrderLineItemsBuilder status(Status value) {
-
-        formData.put("status", value);
-
-        return this;
-      }
-
-      public OrderLineItemsBuilder sku(String value) {
-
-        formData.put("sku", value);
-
-        return this;
-      }
-
-      public OrderLineItemsParams build() {
-        return new OrderLineItemsParams(this);
-      }
-    }
-
-    public enum Status {
-      QUEUED("queued"),
-
-      AWAITING_SHIPMENT("awaiting_shipment"),
-
-      ON_HOLD("on_hold"),
-
-      DELIVERED("delivered"),
-
-      SHIPPED("shipped"),
-
-      PARTIALLY_DELIVERED("partially_delivered"),
-
-      RETURNED("returned"),
-
-      CANCELLED("cancelled"),
-
-      /** An enum member indicating that Status was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Status(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Status fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Status enumValue : Status.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentIntent/params/PaymentIntentCreateParams.java b/src/main/java/com/chargebee/v4/core/models/paymentIntent/params/PaymentIntentCreateParams.java
deleted file mode 100644
index b6f37293..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentIntent/params/PaymentIntentCreateParams.java
+++ /dev/null
@@ -1,172 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentIntent.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentIntentCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentIntentCreateParams(PaymentIntentCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentIntentCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentIntentCreateBuilder builder() {
-    return new PaymentIntentCreateBuilder();
-  }
-
-  public static final class PaymentIntentCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentIntentCreateBuilder() {}
-
-    public PaymentIntentCreateBuilder businessEntityId(String value) {
-
-      formData.put("business_entity_id", value);
-
-      return this;
-    }
-
-    public PaymentIntentCreateBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PaymentIntentCreateBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public PaymentIntentCreateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public PaymentIntentCreateBuilder gatewayAccountId(String value) {
-
-      formData.put("gateway_account_id", value);
-
-      return this;
-    }
-
-    public PaymentIntentCreateBuilder referenceId(String value) {
-
-      formData.put("reference_id", value);
-
-      return this;
-    }
-
-    public PaymentIntentCreateBuilder paymentMethodType(PaymentMethodType value) {
-
-      formData.put("payment_method_type", value);
-
-      return this;
-    }
-
-    public PaymentIntentCreateBuilder successUrl(String value) {
-
-      formData.put("success_url", value);
-
-      return this;
-    }
-
-    public PaymentIntentCreateBuilder failureUrl(String value) {
-
-      formData.put("failure_url", value);
-
-      return this;
-    }
-
-    public PaymentIntentCreateParams build() {
-      return new PaymentIntentCreateParams(this);
-    }
-  }
-
-  public enum PaymentMethodType {
-    CARD("card"),
-
-    IDEAL("ideal"),
-
-    SOFORT("sofort"),
-
-    BANCONTACT("bancontact"),
-
-    GOOGLE_PAY("google_pay"),
-
-    DOTPAY("dotpay"),
-
-    GIROPAY("giropay"),
-
-    APPLE_PAY("apple_pay"),
-
-    UPI("upi"),
-
-    NETBANKING_EMANDATES("netbanking_emandates"),
-
-    PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-    DIRECT_DEBIT("direct_debit"),
-
-    BOLETO("boleto"),
-
-    VENMO("venmo"),
-
-    AMAZON_PAYMENTS("amazon_payments"),
-
-    PAY_TO("pay_to"),
-
-    FASTER_PAYMENTS("faster_payments"),
-
-    SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-    KLARNA_PAY_NOW("klarna_pay_now"),
-
-    ONLINE_BANKING_POLAND("online_banking_poland"),
-
-    PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-    /** An enum member indicating that PaymentMethodType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentMethodType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentMethodType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentIntent/params/PaymentIntentUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/paymentIntent/params/PaymentIntentUpdateParams.java
deleted file mode 100644
index 430a2e0c..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentIntent/params/PaymentIntentUpdateParams.java
+++ /dev/null
@@ -1,151 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentIntent.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentIntentUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentIntentUpdateParams(PaymentIntentUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentIntentUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentIntentUpdateBuilder builder() {
-    return new PaymentIntentUpdateBuilder();
-  }
-
-  public static final class PaymentIntentUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentIntentUpdateBuilder() {}
-
-    public PaymentIntentUpdateBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public PaymentIntentUpdateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public PaymentIntentUpdateBuilder gatewayAccountId(String value) {
-
-      formData.put("gateway_account_id", value);
-
-      return this;
-    }
-
-    public PaymentIntentUpdateBuilder paymentMethodType(PaymentMethodType value) {
-
-      formData.put("payment_method_type", value);
-
-      return this;
-    }
-
-    public PaymentIntentUpdateBuilder successUrl(String value) {
-
-      formData.put("success_url", value);
-
-      return this;
-    }
-
-    public PaymentIntentUpdateBuilder failureUrl(String value) {
-
-      formData.put("failure_url", value);
-
-      return this;
-    }
-
-    public PaymentIntentUpdateParams build() {
-      return new PaymentIntentUpdateParams(this);
-    }
-  }
-
-  public enum PaymentMethodType {
-    CARD("card"),
-
-    IDEAL("ideal"),
-
-    SOFORT("sofort"),
-
-    BANCONTACT("bancontact"),
-
-    GOOGLE_PAY("google_pay"),
-
-    DOTPAY("dotpay"),
-
-    GIROPAY("giropay"),
-
-    APPLE_PAY("apple_pay"),
-
-    UPI("upi"),
-
-    NETBANKING_EMANDATES("netbanking_emandates"),
-
-    PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-    DIRECT_DEBIT("direct_debit"),
-
-    BOLETO("boleto"),
-
-    VENMO("venmo"),
-
-    AMAZON_PAYMENTS("amazon_payments"),
-
-    PAY_TO("pay_to"),
-
-    FASTER_PAYMENTS("faster_payments"),
-
-    SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-    KLARNA_PAY_NOW("klarna_pay_now"),
-
-    ONLINE_BANKING_POLAND("online_banking_poland"),
-
-    PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-    /** An enum member indicating that PaymentMethodType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentMethodType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentMethodType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentScheduleScheme/params/PaymentScheduleSchemeCreateParams.java b/src/main/java/com/chargebee/v4/core/models/paymentScheduleScheme/params/PaymentScheduleSchemeCreateParams.java
deleted file mode 100644
index 7bfc59d1..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentScheduleScheme/params/PaymentScheduleSchemeCreateParams.java
+++ /dev/null
@@ -1,164 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentScheduleScheme.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.math.BigDecimal;
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class PaymentScheduleSchemeCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentScheduleSchemeCreateParams(PaymentScheduleSchemeCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentScheduleSchemeCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentScheduleSchemeCreateBuilder builder() {
-    return new PaymentScheduleSchemeCreateBuilder();
-  }
-
-  public static final class PaymentScheduleSchemeCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentScheduleSchemeCreateBuilder() {}
-
-    public PaymentScheduleSchemeCreateBuilder numberOfSchedules(Integer value) {
-
-      formData.put("number_of_schedules", value);
-
-      return this;
-    }
-
-    public PaymentScheduleSchemeCreateBuilder periodUnit(PeriodUnit value) {
-
-      formData.put("period_unit", value);
-
-      return this;
-    }
-
-    public PaymentScheduleSchemeCreateBuilder period(Integer value) {
-
-      formData.put("period", value);
-
-      return this;
-    }
-
-    public PaymentScheduleSchemeCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public PaymentScheduleSchemeCreateBuilder flexibleSchedules(
-        List<FlexibleSchedulesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          FlexibleSchedulesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "flexible_schedules[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PaymentScheduleSchemeCreateParams build() {
-      return new PaymentScheduleSchemeCreateParams(this);
-    }
-  }
-
-  public enum PeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PeriodUnit enumValue : PeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class FlexibleSchedulesParams {
-
-    private final Map<String, Object> formData;
-
-    private FlexibleSchedulesParams(FlexibleSchedulesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for FlexibleSchedulesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static FlexibleSchedulesBuilder builder() {
-      return new FlexibleSchedulesBuilder();
-    }
-
-    public static final class FlexibleSchedulesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private FlexibleSchedulesBuilder() {}
-
-      public FlexibleSchedulesBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public FlexibleSchedulesBuilder amountPercentage(BigDecimal value) {
-
-        formData.put("amount_percentage", value);
-
-        return this;
-      }
-
-      public FlexibleSchedulesParams build() {
-        return new FlexibleSchedulesParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateBankAccountParams.java b/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateBankAccountParams.java
deleted file mode 100644
index df77ae99..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateBankAccountParams.java
+++ /dev/null
@@ -1,310 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentSource.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentSourceCreateBankAccountParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentSourceCreateBankAccountParams(PaymentSourceCreateBankAccountBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentSourceCreateBankAccountParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentSourceCreateBankAccountBuilder builder() {
-    return new PaymentSourceCreateBankAccountBuilder();
-  }
-
-  public static final class PaymentSourceCreateBankAccountBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentSourceCreateBankAccountBuilder() {}
-
-    public PaymentSourceCreateBankAccountBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateBankAccountBuilder issuingCountry(String value) {
-
-      formData.put("issuing_country", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateBankAccountBuilder replacePrimaryPaymentSource(Boolean value) {
-
-      formData.put("replace_primary_payment_source", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateBankAccountBuilder bankAccount(BankAccountParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "bank_account[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PaymentSourceCreateBankAccountParams build() {
-      return new PaymentSourceCreateBankAccountParams(this);
-    }
-  }
-
-  public static final class BankAccountParams {
-
-    private final Map<String, Object> formData;
-
-    private BankAccountParams(BankAccountBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BankAccountParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BankAccountBuilder builder() {
-      return new BankAccountBuilder();
-    }
-
-    public static final class BankAccountBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BankAccountBuilder() {}
-
-      public BankAccountBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder iban(String value) {
-
-        formData.put("iban", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder bankName(String value) {
-
-        formData.put("bank_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountNumber(String value) {
-
-        formData.put("account_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder routingNumber(String value) {
-
-        formData.put("routing_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder bankCode(String value) {
-
-        formData.put("bank_code", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountType(AccountType value) {
-
-        formData.put("account_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountHolderType(AccountHolderType value) {
-
-        formData.put("account_holder_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder echeckType(EcheckType value) {
-
-        formData.put("echeck_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder swedishIdentityNumber(String value) {
-
-        formData.put("swedish_identity_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder billingAddress(java.util.Map<String, Object> value) {
-
-        formData.put("billing_address", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public BankAccountParams build() {
-        return new BankAccountParams(this);
-      }
-    }
-
-    public enum AccountType {
-      CHECKING("checking"),
-
-      SAVINGS("savings"),
-
-      BUSINESS_CHECKING("business_checking"),
-
-      CURRENT("current"),
-
-      /** An enum member indicating that AccountType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AccountType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AccountType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AccountType enumValue : AccountType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum AccountHolderType {
-      INDIVIDUAL("individual"),
-
-      COMPANY("company"),
-
-      /**
-       * An enum member indicating that AccountHolderType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      AccountHolderType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AccountHolderType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AccountHolderType enumValue : AccountHolderType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum EcheckType {
-      WEB("web"),
-
-      PPD("ppd"),
-
-      CCD("ccd"),
-
-      /** An enum member indicating that EcheckType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EcheckType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EcheckType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EcheckType enumValue : EcheckType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateCardParams.java b/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateCardParams.java
deleted file mode 100644
index 340d2335..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateCardParams.java
+++ /dev/null
@@ -1,241 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentSource.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentSourceCreateCardParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentSourceCreateCardParams(PaymentSourceCreateCardBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentSourceCreateCardParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentSourceCreateCardBuilder builder() {
-    return new PaymentSourceCreateCardBuilder();
-  }
-
-  public static final class PaymentSourceCreateCardBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentSourceCreateCardBuilder() {}
-
-    public PaymentSourceCreateCardBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateCardBuilder replacePrimaryPaymentSource(Boolean value) {
-
-      formData.put("replace_primary_payment_source", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateCardBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PaymentSourceCreateCardParams build() {
-      return new PaymentSourceCreateCardParams(this);
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public CardBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CardBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CardBuilder number(String value) {
-
-        formData.put("number", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryMonth(Integer value) {
-
-        formData.put("expiry_month", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryYear(Integer value) {
-
-        formData.put("expiry_year", value);
-
-        return this;
-      }
-
-      public CardBuilder cvv(String value) {
-
-        formData.put("cvv", value);
-
-        return this;
-      }
-
-      public CardBuilder preferredScheme(PreferredScheme value) {
-
-        formData.put("preferred_scheme", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr1(String value) {
-
-        formData.put("billing_addr1", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr2(String value) {
-
-        formData.put("billing_addr2", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCity(String value) {
-
-        formData.put("billing_city", value);
-
-        return this;
-      }
-
-      public CardBuilder billingStateCode(String value) {
-
-        formData.put("billing_state_code", value);
-
-        return this;
-      }
-
-      public CardBuilder billingState(String value) {
-
-        formData.put("billing_state", value);
-
-        return this;
-      }
-
-      public CardBuilder billingZip(String value) {
-
-        formData.put("billing_zip", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCountry(String value) {
-
-        formData.put("billing_country", value);
-
-        return this;
-      }
-
-      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum PreferredScheme {
-      CARTES_BANCAIRES("cartes_bancaires"),
-
-      MASTERCARD("mastercard"),
-
-      VISA("visa"),
-
-      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PreferredScheme(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PreferredScheme fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PreferredScheme enumValue : PreferredScheme.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateUsingPaymentIntentParams.java b/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateUsingPaymentIntentParams.java
deleted file mode 100644
index 2f4590b0..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateUsingPaymentIntentParams.java
+++ /dev/null
@@ -1,225 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentSource.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentSourceCreateUsingPaymentIntentParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentSourceCreateUsingPaymentIntentParams(
-      PaymentSourceCreateUsingPaymentIntentBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentSourceCreateUsingPaymentIntentParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentSourceCreateUsingPaymentIntentBuilder builder() {
-    return new PaymentSourceCreateUsingPaymentIntentBuilder();
-  }
-
-  public static final class PaymentSourceCreateUsingPaymentIntentBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentSourceCreateUsingPaymentIntentBuilder() {}
-
-    public PaymentSourceCreateUsingPaymentIntentBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPaymentIntentBuilder replacePrimaryPaymentSource(Boolean value) {
-
-      formData.put("replace_primary_payment_source", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPaymentIntentBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPaymentIntentParams build() {
-      return new PaymentSourceCreateUsingPaymentIntentParams(this);
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInfo(java.util.Map<String, Object> value) {
-
-        formData.put("additional_info", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateUsingPermanentTokenParams.java b/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateUsingPermanentTokenParams.java
deleted file mode 100644
index 946e088e..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateUsingPermanentTokenParams.java
+++ /dev/null
@@ -1,505 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentSource.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentSourceCreateUsingPermanentTokenParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentSourceCreateUsingPermanentTokenParams(
-      PaymentSourceCreateUsingPermanentTokenBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentSourceCreateUsingPermanentTokenParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentSourceCreateUsingPermanentTokenBuilder builder() {
-    return new PaymentSourceCreateUsingPermanentTokenBuilder();
-  }
-
-  public static final class PaymentSourceCreateUsingPermanentTokenBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentSourceCreateUsingPermanentTokenBuilder() {}
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder type(Type value) {
-
-      formData.put("type", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder gatewayAccountId(String value) {
-
-      formData.put("gateway_account_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder referenceId(String value) {
-
-      formData.put("reference_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder issuingCountry(String value) {
-
-      formData.put("issuing_country", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder replacePrimaryPaymentSource(
-        Boolean value) {
-
-      formData.put("replace_primary_payment_source", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder paymentMethodToken(String value) {
-
-      formData.put("payment_method_token", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder customerProfileToken(String value) {
-
-      formData.put("customer_profile_token", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder networkTransactionId(String value) {
-
-      formData.put("network_transaction_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder mandateId(String value) {
-
-      formData.put("mandate_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder skipRetrieval(Boolean value) {
-
-      formData.put("skip_retrieval", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder additionalInformation(
-        java.util.Map<String, Object> value) {
-
-      formData.put("additional_information", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenBuilder billingAddress(
-        BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PaymentSourceCreateUsingPermanentTokenParams build() {
-      return new PaymentSourceCreateUsingPermanentTokenParams(this);
-    }
-  }
-
-  public enum Type {
-    CARD("card"),
-
-    PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-    AMAZON_PAYMENTS("amazon_payments"),
-
-    DIRECT_DEBIT("direct_debit"),
-
-    GENERIC("generic"),
-
-    ALIPAY("alipay"),
-
-    UNIONPAY("unionpay"),
-
-    APPLE_PAY("apple_pay"),
-
-    WECHAT_PAY("wechat_pay"),
-
-    IDEAL("ideal"),
-
-    GOOGLE_PAY("google_pay"),
-
-    SOFORT("sofort"),
-
-    BANCONTACT("bancontact"),
-
-    GIROPAY("giropay"),
-
-    DOTPAY("dotpay"),
-
-    UPI("upi"),
-
-    NETBANKING_EMANDATES("netbanking_emandates"),
-
-    VENMO("venmo"),
-
-    PAY_TO("pay_to"),
-
-    FASTER_PAYMENTS("faster_payments"),
-
-    SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-    AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
-
-    KLARNA_PAY_NOW("klarna_pay_now"),
-
-    ONLINE_BANKING_POLAND("online_banking_poland"),
-
-    PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-    /** An enum member indicating that Type was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Type(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Type fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Type enumValue : Type.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      public CardBuilder last4(String value) {
-
-        formData.put("last4", value);
-
-        return this;
-      }
-
-      public CardBuilder iin(String value) {
-
-        formData.put("iin", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryMonth(Integer value) {
-
-        formData.put("expiry_month", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryYear(Integer value) {
-
-        formData.put("expiry_year", value);
-
-        return this;
-      }
-
-      public CardBuilder brand(Brand value) {
-
-        formData.put("brand", value);
-
-        return this;
-      }
-
-      public CardBuilder fundingType(FundingType value) {
-
-        formData.put("funding_type", value);
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Brand {
-      VISA("visa"),
-
-      MASTERCARD("mastercard"),
-
-      AMERICAN_EXPRESS("american_express"),
-
-      DISCOVER("discover"),
-
-      JCB("jcb"),
-
-      DINERS_CLUB("diners_club"),
-
-      OTHER("other"),
-
-      BANCONTACT("bancontact"),
-
-      CMR_FALABELLA("cmr_falabella"),
-
-      TARJETA_NARANJA("tarjeta_naranja"),
-
-      NATIVA("nativa"),
-
-      CENCOSUD("cencosud"),
-
-      CABAL("cabal"),
-
-      ARGENCARD("argencard"),
-
-      ELO("elo"),
-
-      HIPERCARD("hipercard"),
-
-      CARNET("carnet"),
-
-      RUPAY("rupay"),
-
-      MAESTRO("maestro"),
-
-      DANKORT("dankort"),
-
-      CARTES_BANCAIRES("cartes_bancaires"),
-
-      /** An enum member indicating that Brand was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Brand(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Brand fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Brand enumValue : Brand.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum FundingType {
-      CREDIT("credit"),
-
-      DEBIT("debit"),
-
-      PREPAID("prepaid"),
-
-      NOT_KNOWN("not_known"),
-
-      /** An enum member indicating that FundingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      FundingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static FundingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (FundingType enumValue : FundingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateUsingTempTokenParams.java b/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateUsingTempTokenParams.java
deleted file mode 100644
index 081f88fe..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateUsingTempTokenParams.java
+++ /dev/null
@@ -1,169 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentSource.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentSourceCreateUsingTempTokenParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentSourceCreateUsingTempTokenParams(
-      PaymentSourceCreateUsingTempTokenBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentSourceCreateUsingTempTokenParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentSourceCreateUsingTempTokenBuilder builder() {
-    return new PaymentSourceCreateUsingTempTokenBuilder();
-  }
-
-  public static final class PaymentSourceCreateUsingTempTokenBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentSourceCreateUsingTempTokenBuilder() {}
-
-    public PaymentSourceCreateUsingTempTokenBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingTempTokenBuilder gatewayAccountId(String value) {
-
-      formData.put("gateway_account_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingTempTokenBuilder type(Type value) {
-
-      formData.put("type", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingTempTokenBuilder tmpToken(String value) {
-
-      formData.put("tmp_token", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingTempTokenBuilder issuingCountry(String value) {
-
-      formData.put("issuing_country", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingTempTokenBuilder replacePrimaryPaymentSource(Boolean value) {
-
-      formData.put("replace_primary_payment_source", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingTempTokenBuilder additionalInformation(
-        java.util.Map<String, Object> value) {
-
-      formData.put("additional_information", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingTempTokenParams build() {
-      return new PaymentSourceCreateUsingTempTokenParams(this);
-    }
-  }
-
-  public enum Type {
-    CARD("card"),
-
-    PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-    AMAZON_PAYMENTS("amazon_payments"),
-
-    DIRECT_DEBIT("direct_debit"),
-
-    GENERIC("generic"),
-
-    ALIPAY("alipay"),
-
-    UNIONPAY("unionpay"),
-
-    APPLE_PAY("apple_pay"),
-
-    WECHAT_PAY("wechat_pay"),
-
-    IDEAL("ideal"),
-
-    GOOGLE_PAY("google_pay"),
-
-    SOFORT("sofort"),
-
-    BANCONTACT("bancontact"),
-
-    GIROPAY("giropay"),
-
-    DOTPAY("dotpay"),
-
-    UPI("upi"),
-
-    NETBANKING_EMANDATES("netbanking_emandates"),
-
-    VENMO("venmo"),
-
-    PAY_TO("pay_to"),
-
-    FASTER_PAYMENTS("faster_payments"),
-
-    SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-    AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
-
-    KLARNA_PAY_NOW("klarna_pay_now"),
-
-    ONLINE_BANKING_POLAND("online_banking_poland"),
-
-    PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-    /** An enum member indicating that Type was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Type(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Type fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Type enumValue : Type.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateUsingTokenParams.java b/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateUsingTokenParams.java
deleted file mode 100644
index 9662deb0..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateUsingTokenParams.java
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentSource.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentSourceCreateUsingTokenParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentSourceCreateUsingTokenParams(PaymentSourceCreateUsingTokenBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentSourceCreateUsingTokenParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentSourceCreateUsingTokenBuilder builder() {
-    return new PaymentSourceCreateUsingTokenBuilder();
-  }
-
-  public static final class PaymentSourceCreateUsingTokenBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentSourceCreateUsingTokenBuilder() {}
-
-    public PaymentSourceCreateUsingTokenBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingTokenBuilder replacePrimaryPaymentSource(Boolean value) {
-
-      formData.put("replace_primary_payment_source", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingTokenBuilder tokenId(String value) {
-
-      formData.put("token_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateUsingTokenParams build() {
-      return new PaymentSourceCreateUsingTokenParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateVoucherPaymentSourceParams.java b/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateVoucherPaymentSourceParams.java
deleted file mode 100644
index 745f5adc..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceCreateVoucherPaymentSourceParams.java
+++ /dev/null
@@ -1,148 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentSource.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentSourceCreateVoucherPaymentSourceParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentSourceCreateVoucherPaymentSourceParams(
-      PaymentSourceCreateVoucherPaymentSourceBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentSourceCreateVoucherPaymentSourceParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentSourceCreateVoucherPaymentSourceBuilder builder() {
-    return new PaymentSourceCreateVoucherPaymentSourceBuilder();
-  }
-
-  public static final class PaymentSourceCreateVoucherPaymentSourceBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentSourceCreateVoucherPaymentSourceBuilder() {}
-
-    public PaymentSourceCreateVoucherPaymentSourceBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceCreateVoucherPaymentSourceBuilder voucherPaymentSource(
-        VoucherPaymentSourceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "voucher_payment_source[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PaymentSourceCreateVoucherPaymentSourceParams build() {
-      return new PaymentSourceCreateVoucherPaymentSourceParams(this);
-    }
-  }
-
-  public static final class VoucherPaymentSourceParams {
-
-    private final Map<String, Object> formData;
-
-    private VoucherPaymentSourceParams(VoucherPaymentSourceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for VoucherPaymentSourceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static VoucherPaymentSourceBuilder builder() {
-      return new VoucherPaymentSourceBuilder();
-    }
-
-    public static final class VoucherPaymentSourceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private VoucherPaymentSourceBuilder() {}
-
-      public VoucherPaymentSourceBuilder voucherType(VoucherType value) {
-
-        formData.put("voucher_type", value);
-
-        return this;
-      }
-
-      public VoucherPaymentSourceBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public VoucherPaymentSourceBuilder taxId(String value) {
-
-        formData.put("tax_id", value);
-
-        return this;
-      }
-
-      public VoucherPaymentSourceBuilder billingAddress(java.util.Map<String, Object> value) {
-
-        formData.put("billing_address", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public VoucherPaymentSourceParams build() {
-        return new VoucherPaymentSourceParams(this);
-      }
-    }
-
-    public enum VoucherType {
-      BOLETO("boleto"),
-
-      /** An enum member indicating that VoucherType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      VoucherType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static VoucherType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (VoucherType enumValue : VoucherType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceExportPaymentSourceParams.java b/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceExportPaymentSourceParams.java
deleted file mode 100644
index 772162e4..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceExportPaymentSourceParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentSource.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentSourceExportPaymentSourceParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentSourceExportPaymentSourceParams(PaymentSourceExportPaymentSourceBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentSourceExportPaymentSourceParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentSourceExportPaymentSourceBuilder builder() {
-    return new PaymentSourceExportPaymentSourceBuilder();
-  }
-
-  public static final class PaymentSourceExportPaymentSourceBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentSourceExportPaymentSourceBuilder() {}
-
-    public PaymentSourceExportPaymentSourceBuilder gatewayAccountId(String value) {
-
-      formData.put("gateway_account_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceExportPaymentSourceParams build() {
-      return new PaymentSourceExportPaymentSourceParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceSwitchGatewayAccountParams.java b/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceSwitchGatewayAccountParams.java
deleted file mode 100644
index 6958e150..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceSwitchGatewayAccountParams.java
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentSource.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentSourceSwitchGatewayAccountParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentSourceSwitchGatewayAccountParams(
-      PaymentSourceSwitchGatewayAccountBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentSourceSwitchGatewayAccountParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentSourceSwitchGatewayAccountBuilder builder() {
-    return new PaymentSourceSwitchGatewayAccountBuilder();
-  }
-
-  public static final class PaymentSourceSwitchGatewayAccountBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentSourceSwitchGatewayAccountBuilder() {}
-
-    public PaymentSourceSwitchGatewayAccountBuilder gatewayAccountId(String value) {
-
-      formData.put("gateway_account_id", value);
-
-      return this;
-    }
-
-    public PaymentSourceSwitchGatewayAccountParams build() {
-      return new PaymentSourceSwitchGatewayAccountParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceUpdateBankAccountParams.java b/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceUpdateBankAccountParams.java
deleted file mode 100644
index d3a98d8f..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceUpdateBankAccountParams.java
+++ /dev/null
@@ -1,105 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentSource.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentSourceUpdateBankAccountParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentSourceUpdateBankAccountParams(PaymentSourceUpdateBankAccountBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentSourceUpdateBankAccountParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentSourceUpdateBankAccountBuilder builder() {
-    return new PaymentSourceUpdateBankAccountBuilder();
-  }
-
-  public static final class PaymentSourceUpdateBankAccountBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentSourceUpdateBankAccountBuilder() {}
-
-    public PaymentSourceUpdateBankAccountBuilder bankAccount(BankAccountParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "bank_account[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PaymentSourceUpdateBankAccountParams build() {
-      return new PaymentSourceUpdateBankAccountParams(this);
-    }
-  }
-
-  public static final class BankAccountParams {
-
-    private final Map<String, Object> formData;
-
-    private BankAccountParams(BankAccountBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BankAccountParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BankAccountBuilder builder() {
-      return new BankAccountBuilder();
-    }
-
-    public static final class BankAccountBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BankAccountBuilder() {}
-
-      public BankAccountBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BankAccountParams build() {
-        return new BankAccountParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceUpdateCardParams.java b/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceUpdateCardParams.java
deleted file mode 100644
index 4f9e57f4..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceUpdateCardParams.java
+++ /dev/null
@@ -1,183 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentSource.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentSourceUpdateCardParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentSourceUpdateCardParams(PaymentSourceUpdateCardBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentSourceUpdateCardParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentSourceUpdateCardBuilder builder() {
-    return new PaymentSourceUpdateCardBuilder();
-  }
-
-  public static final class PaymentSourceUpdateCardBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentSourceUpdateCardBuilder() {}
-
-    public PaymentSourceUpdateCardBuilder gatewayMetaData(java.util.Map<String, Object> value) {
-
-      formData.put("gateway_meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public PaymentSourceUpdateCardBuilder referenceTransaction(String value) {
-
-      formData.put("reference_transaction", value);
-
-      return this;
-    }
-
-    public PaymentSourceUpdateCardBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PaymentSourceUpdateCardParams build() {
-      return new PaymentSourceUpdateCardParams(this);
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      public CardBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CardBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryMonth(Integer value) {
-
-        formData.put("expiry_month", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryYear(Integer value) {
-
-        formData.put("expiry_year", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr1(String value) {
-
-        formData.put("billing_addr1", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr2(String value) {
-
-        formData.put("billing_addr2", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCity(String value) {
-
-        formData.put("billing_city", value);
-
-        return this;
-      }
-
-      public CardBuilder billingZip(String value) {
-
-        formData.put("billing_zip", value);
-
-        return this;
-      }
-
-      public CardBuilder billingStateCode(String value) {
-
-        formData.put("billing_state_code", value);
-
-        return this;
-      }
-
-      public CardBuilder billingState(String value) {
-
-        formData.put("billing_state", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCountry(String value) {
-
-        formData.put("billing_country", value);
-
-        return this;
-      }
-
-      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceVerifyBankAccountParams.java b/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceVerifyBankAccountParams.java
deleted file mode 100644
index cac92347..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceVerifyBankAccountParams.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentSource.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentSourceVerifyBankAccountParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentSourceVerifyBankAccountParams(PaymentSourceVerifyBankAccountBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentSourceVerifyBankAccountParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentSourceVerifyBankAccountBuilder builder() {
-    return new PaymentSourceVerifyBankAccountBuilder();
-  }
-
-  public static final class PaymentSourceVerifyBankAccountBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentSourceVerifyBankAccountBuilder() {}
-
-    public PaymentSourceVerifyBankAccountBuilder amount1(Long value) {
-
-      formData.put("amount1", value);
-
-      return this;
-    }
-
-    public PaymentSourceVerifyBankAccountBuilder amount2(Long value) {
-
-      formData.put("amount2", value);
-
-      return this;
-    }
-
-    public PaymentSourceVerifyBankAccountParams build() {
-      return new PaymentSourceVerifyBankAccountParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentVoucher/params/PaymentVoucherCreateParams.java b/src/main/java/com/chargebee/v4/core/models/paymentVoucher/params/PaymentVoucherCreateParams.java
deleted file mode 100644
index e8415f33..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentVoucher/params/PaymentVoucherCreateParams.java
+++ /dev/null
@@ -1,185 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.paymentVoucher.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class PaymentVoucherCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private PaymentVoucherCreateParams(PaymentVoucherCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PaymentVoucherCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentVoucherCreateBuilder builder() {
-    return new PaymentVoucherCreateBuilder();
-  }
-
-  public static final class PaymentVoucherCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PaymentVoucherCreateBuilder() {}
-
-    public PaymentVoucherCreateBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PaymentVoucherCreateBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public PaymentVoucherCreateBuilder voucherPaymentSource(VoucherPaymentSourceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "voucher_payment_source[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PaymentVoucherCreateBuilder invoiceAllocations(List<InvoiceAllocationsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          InvoiceAllocationsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "invoice_allocations[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PaymentVoucherCreateParams build() {
-      return new PaymentVoucherCreateParams(this);
-    }
-  }
-
-  public static final class VoucherPaymentSourceParams {
-
-    private final Map<String, Object> formData;
-
-    private VoucherPaymentSourceParams(VoucherPaymentSourceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for VoucherPaymentSourceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static VoucherPaymentSourceBuilder builder() {
-      return new VoucherPaymentSourceBuilder();
-    }
-
-    public static final class VoucherPaymentSourceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private VoucherPaymentSourceBuilder() {}
-
-      public VoucherPaymentSourceBuilder voucherType(VoucherType value) {
-
-        formData.put("voucher_type", value);
-
-        return this;
-      }
-
-      public VoucherPaymentSourceParams build() {
-        return new VoucherPaymentSourceParams(this);
-      }
-    }
-
-    public enum VoucherType {
-      BOLETO("boleto"),
-
-      /** An enum member indicating that VoucherType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      VoucherType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static VoucherType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (VoucherType enumValue : VoucherType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class InvoiceAllocationsParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceAllocationsParams(InvoiceAllocationsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceAllocationsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceAllocationsBuilder builder() {
-      return new InvoiceAllocationsBuilder();
-    }
-
-    public static final class InvoiceAllocationsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceAllocationsBuilder() {}
-
-      public InvoiceAllocationsBuilder invoiceId(String value) {
-
-        formData.put("invoice_id", value);
-
-        return this;
-      }
-
-      public InvoiceAllocationsParams build() {
-        return new InvoiceAllocationsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentVoucher/params/PaymentVoucherPaymentVouchersForCustomerParams.java b/src/main/java/com/chargebee/v4/core/models/paymentVoucher/params/PaymentVoucherPaymentVouchersForCustomerParams.java
deleted file mode 100644
index d71fcb80..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentVoucher/params/PaymentVoucherPaymentVouchersForCustomerParams.java
+++ /dev/null
@@ -1,263 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.paymentVoucher.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentVoucherPaymentVouchersForCustomerParams {
-
-  private final Map<String, Object> queryParams;
-
-  private PaymentVoucherPaymentVouchersForCustomerParams(
-      PaymentVoucherPaymentVouchersForCustomerBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public PaymentVoucherPaymentVouchersForCustomerBuilder toBuilder() {
-    PaymentVoucherPaymentVouchersForCustomerBuilder builder =
-        new PaymentVoucherPaymentVouchersForCustomerBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for PaymentVoucherPaymentVouchersForCustomerParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentVoucherPaymentVouchersForCustomerBuilder builder() {
-    return new PaymentVoucherPaymentVouchersForCustomerBuilder();
-  }
-
-  public static final class PaymentVoucherPaymentVouchersForCustomerBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private PaymentVoucherPaymentVouchersForCustomerBuilder() {}
-
-    public PaymentVoucherPaymentVouchersForCustomerBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public PaymentVoucherPaymentVouchersForCustomerBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public StatusFilter status() {
-      return new StatusFilter("status", this);
-    }
-
-    public SortBySortBuilder sortBy() {
-      return new SortBySortBuilder("sort_by", this);
-    }
-
-    public PaymentVoucherPaymentVouchersForCustomerParams build() {
-      return new PaymentVoucherPaymentVouchersForCustomerParams(this);
-    }
-
-    public static final class StatusFilter {
-      private final String fieldName;
-      private final PaymentVoucherPaymentVouchersForCustomerBuilder builder;
-
-      StatusFilter(String fieldName, PaymentVoucherPaymentVouchersForCustomerBuilder builder) {
-        this.fieldName = fieldName;
-        this.builder = builder;
-      }
-
-      public PaymentVoucherPaymentVouchersForCustomerBuilder is(String value) {
-        builder.queryParams.put(fieldName + "[is]", value);
-        return builder;
-      }
-
-      public PaymentVoucherPaymentVouchersForCustomerBuilder isNot(String value) {
-        builder.queryParams.put(fieldName + "[is_not]", value);
-        return builder;
-      }
-
-      public PaymentVoucherPaymentVouchersForCustomerBuilder in(String... values) {
-        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
-        return builder;
-      }
-
-      public PaymentVoucherPaymentVouchersForCustomerBuilder notIn(String... values) {
-        builder.queryParams.put(fieldName + "[not_in]", "[" + String.join(",", values) + "]");
-        return builder;
-      }
-    }
-
-    public static final class SortBySortBuilder {
-      private final String fieldName;
-      private final PaymentVoucherPaymentVouchersForCustomerBuilder builder;
-
-      SortBySortBuilder(String fieldName, PaymentVoucherPaymentVouchersForCustomerBuilder builder) {
-        this.fieldName = fieldName;
-        this.builder = builder;
-      }
-
-      public SortDirection date() {
-        return new SortDirection(fieldName, "date", builder);
-      }
-
-      public SortDirection updated_at() {
-        return new SortDirection(fieldName, "updated_at", builder);
-      }
-    }
-
-    public static final class SortDirection {
-      private final String fieldName;
-      private final String selectedField;
-      private final PaymentVoucherPaymentVouchersForCustomerBuilder builder;
-
-      SortDirection(
-          String fieldName,
-          String selectedField,
-          PaymentVoucherPaymentVouchersForCustomerBuilder builder) {
-        this.fieldName = fieldName;
-        this.selectedField = selectedField;
-        this.builder = builder;
-      }
-
-      public PaymentVoucherPaymentVouchersForCustomerBuilder asc() {
-        builder.queryParams.put(fieldName + "[asc]", selectedField);
-        return builder;
-      }
-
-      public PaymentVoucherPaymentVouchersForCustomerBuilder desc() {
-        builder.queryParams.put(fieldName + "[desc]", selectedField);
-        return builder;
-      }
-    }
-  }
-
-  public enum StatusIs {
-    ACTIVE("active"),
-
-    CONSUMED("consumed"),
-
-    EXPIRED("expired"),
-
-    FAILURE("failure"),
-
-    /** An enum member indicating that StatusIs was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    StatusIs(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static StatusIs fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (StatusIs enumValue : StatusIs.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum StatusIsNot {
-    ACTIVE("active"),
-
-    CONSUMED("consumed"),
-
-    EXPIRED("expired"),
-
-    FAILURE("failure"),
-
-    /** An enum member indicating that StatusIsNot was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    StatusIsNot(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static StatusIsNot fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (StatusIsNot enumValue : StatusIsNot.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum SortByAsc {
-    DATE("date"),
-
-    UPDATED_AT("updated_at"),
-
-    /** An enum member indicating that SortByAsc was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    SortByAsc(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static SortByAsc fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (SortByAsc enumValue : SortByAsc.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum SortByDesc {
-    DATE("date"),
-
-    UPDATED_AT("updated_at"),
-
-    /** An enum member indicating that SortByDesc was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    SortByDesc(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static SortByDesc fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (SortByDesc enumValue : SortByDesc.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentVoucher/params/PaymentVoucherPaymentVouchersForInvoiceParams.java b/src/main/java/com/chargebee/v4/core/models/paymentVoucher/params/PaymentVoucherPaymentVouchersForInvoiceParams.java
deleted file mode 100644
index 4dd82304..00000000
--- a/src/main/java/com/chargebee/v4/core/models/paymentVoucher/params/PaymentVoucherPaymentVouchersForInvoiceParams.java
+++ /dev/null
@@ -1,263 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.paymentVoucher.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PaymentVoucherPaymentVouchersForInvoiceParams {
-
-  private final Map<String, Object> queryParams;
-
-  private PaymentVoucherPaymentVouchersForInvoiceParams(
-      PaymentVoucherPaymentVouchersForInvoiceBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public PaymentVoucherPaymentVouchersForInvoiceBuilder toBuilder() {
-    PaymentVoucherPaymentVouchersForInvoiceBuilder builder =
-        new PaymentVoucherPaymentVouchersForInvoiceBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for PaymentVoucherPaymentVouchersForInvoiceParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PaymentVoucherPaymentVouchersForInvoiceBuilder builder() {
-    return new PaymentVoucherPaymentVouchersForInvoiceBuilder();
-  }
-
-  public static final class PaymentVoucherPaymentVouchersForInvoiceBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private PaymentVoucherPaymentVouchersForInvoiceBuilder() {}
-
-    public PaymentVoucherPaymentVouchersForInvoiceBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public PaymentVoucherPaymentVouchersForInvoiceBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public StatusFilter status() {
-      return new StatusFilter("status", this);
-    }
-
-    public SortBySortBuilder sortBy() {
-      return new SortBySortBuilder("sort_by", this);
-    }
-
-    public PaymentVoucherPaymentVouchersForInvoiceParams build() {
-      return new PaymentVoucherPaymentVouchersForInvoiceParams(this);
-    }
-
-    public static final class StatusFilter {
-      private final String fieldName;
-      private final PaymentVoucherPaymentVouchersForInvoiceBuilder builder;
-
-      StatusFilter(String fieldName, PaymentVoucherPaymentVouchersForInvoiceBuilder builder) {
-        this.fieldName = fieldName;
-        this.builder = builder;
-      }
-
-      public PaymentVoucherPaymentVouchersForInvoiceBuilder is(String value) {
-        builder.queryParams.put(fieldName + "[is]", value);
-        return builder;
-      }
-
-      public PaymentVoucherPaymentVouchersForInvoiceBuilder isNot(String value) {
-        builder.queryParams.put(fieldName + "[is_not]", value);
-        return builder;
-      }
-
-      public PaymentVoucherPaymentVouchersForInvoiceBuilder in(String... values) {
-        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
-        return builder;
-      }
-
-      public PaymentVoucherPaymentVouchersForInvoiceBuilder notIn(String... values) {
-        builder.queryParams.put(fieldName + "[not_in]", "[" + String.join(",", values) + "]");
-        return builder;
-      }
-    }
-
-    public static final class SortBySortBuilder {
-      private final String fieldName;
-      private final PaymentVoucherPaymentVouchersForInvoiceBuilder builder;
-
-      SortBySortBuilder(String fieldName, PaymentVoucherPaymentVouchersForInvoiceBuilder builder) {
-        this.fieldName = fieldName;
-        this.builder = builder;
-      }
-
-      public SortDirection date() {
-        return new SortDirection(fieldName, "date", builder);
-      }
-
-      public SortDirection updated_at() {
-        return new SortDirection(fieldName, "updated_at", builder);
-      }
-    }
-
-    public static final class SortDirection {
-      private final String fieldName;
-      private final String selectedField;
-      private final PaymentVoucherPaymentVouchersForInvoiceBuilder builder;
-
-      SortDirection(
-          String fieldName,
-          String selectedField,
-          PaymentVoucherPaymentVouchersForInvoiceBuilder builder) {
-        this.fieldName = fieldName;
-        this.selectedField = selectedField;
-        this.builder = builder;
-      }
-
-      public PaymentVoucherPaymentVouchersForInvoiceBuilder asc() {
-        builder.queryParams.put(fieldName + "[asc]", selectedField);
-        return builder;
-      }
-
-      public PaymentVoucherPaymentVouchersForInvoiceBuilder desc() {
-        builder.queryParams.put(fieldName + "[desc]", selectedField);
-        return builder;
-      }
-    }
-  }
-
-  public enum StatusIs {
-    ACTIVE("active"),
-
-    CONSUMED("consumed"),
-
-    EXPIRED("expired"),
-
-    FAILURE("failure"),
-
-    /** An enum member indicating that StatusIs was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    StatusIs(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static StatusIs fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (StatusIs enumValue : StatusIs.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum StatusIsNot {
-    ACTIVE("active"),
-
-    CONSUMED("consumed"),
-
-    EXPIRED("expired"),
-
-    FAILURE("failure"),
-
-    /** An enum member indicating that StatusIsNot was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    StatusIsNot(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static StatusIsNot fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (StatusIsNot enumValue : StatusIsNot.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum SortByAsc {
-    DATE("date"),
-
-    UPDATED_AT("updated_at"),
-
-    /** An enum member indicating that SortByAsc was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    SortByAsc(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static SortByAsc fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (SortByAsc enumValue : SortByAsc.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum SortByDesc {
-    DATE("date"),
-
-    UPDATED_AT("updated_at"),
-
-    /** An enum member indicating that SortByDesc was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    SortByDesc(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static SortByDesc fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (SortByDesc enumValue : SortByDesc.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemCreateParams.java b/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemCreateParams.java
deleted file mode 100644
index 5e857569..00000000
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemCreateParams.java
+++ /dev/null
@@ -1,266 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.pc2MigrationItem.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class Pc2MigrationItemCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private Pc2MigrationItemCreateParams(Pc2MigrationItemCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for Pc2MigrationItemCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static Pc2MigrationItemCreateBuilder builder() {
-    return new Pc2MigrationItemCreateBuilder();
-  }
-
-  public static final class Pc2MigrationItemCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private Pc2MigrationItemCreateBuilder() {}
-
-    public Pc2MigrationItemCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder pc1Type(Pc1Type value) {
-
-      formData.put("pc1_type", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder pc2MigrationItemFamilyId(String value) {
-
-      formData.put("pc2_migration_item_family_id", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder pc2MigrationId(String value) {
-
-      formData.put("pc2_migration_id", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder metadata(String value) {
-
-      formData.put("metadata", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder isGiftable(Boolean value) {
-
-      formData.put("is_giftable", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder isShippable(Boolean value) {
-
-      formData.put("is_shippable", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder enabledForCheckout(Boolean value) {
-
-      formData.put("enabled_for_checkout", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder enabledInPortal(Boolean value) {
-
-      formData.put("enabled_in_portal", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder isRecurring(Boolean value) {
-
-      formData.put("is_recurring", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder giftClaimRedirectUrl(String value) {
-
-      formData.put("gift_claim_redirect_url", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder includedInMrr(Boolean value) {
-
-      formData.put("included_in_mrr", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder unit(String value) {
-
-      formData.put("unit", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemCreateBuilder pc2MigrationItemPrices(
-        List<Pc2MigrationItemPricesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          Pc2MigrationItemPricesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "pc2_migration_item_prices[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public Pc2MigrationItemCreateParams build() {
-      return new Pc2MigrationItemCreateParams(this);
-    }
-  }
-
-  public enum Pc1Type {
-    PLAN("plan"),
-
-    ADDON("addon"),
-
-    /** An enum member indicating that Pc1Type was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Pc1Type(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Pc1Type fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Pc1Type enumValue : Pc1Type.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class Pc2MigrationItemPricesParams {
-
-    private final Map<String, Object> formData;
-
-    private Pc2MigrationItemPricesParams(Pc2MigrationItemPricesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for Pc2MigrationItemPricesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static Pc2MigrationItemPricesBuilder builder() {
-      return new Pc2MigrationItemPricesBuilder();
-    }
-
-    public static final class Pc2MigrationItemPricesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private Pc2MigrationItemPricesBuilder() {}
-
-      public Pc2MigrationItemPricesBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public Pc2MigrationItemPricesBuilder name(String value) {
-
-        formData.put("name", value);
-
-        return this;
-      }
-
-      public Pc2MigrationItemPricesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public Pc2MigrationItemPricesBuilder metadata(String value) {
-
-        formData.put("metadata", value);
-
-        return this;
-      }
-
-      public Pc2MigrationItemPricesBuilder refEntityId(String value) {
-
-        formData.put("ref_entity_id", value);
-
-        return this;
-      }
-
-      public Pc2MigrationItemPricesParams build() {
-        return new Pc2MigrationItemPricesParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemUpdateParams.java
deleted file mode 100644
index 5910e2bf..00000000
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemUpdateParams.java
+++ /dev/null
@@ -1,224 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.pc2MigrationItem.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class Pc2MigrationItemUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private Pc2MigrationItemUpdateParams(Pc2MigrationItemUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for Pc2MigrationItemUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static Pc2MigrationItemUpdateBuilder builder() {
-    return new Pc2MigrationItemUpdateBuilder();
-  }
-
-  public static final class Pc2MigrationItemUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private Pc2MigrationItemUpdateBuilder() {}
-
-    public Pc2MigrationItemUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder pc2MigrationItemFamilyId(String value) {
-
-      formData.put("pc2_migration_item_family_id", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder metadata(String value) {
-
-      formData.put("metadata", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder isGiftable(Boolean value) {
-
-      formData.put("is_giftable", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder isShippable(Boolean value) {
-
-      formData.put("is_shippable", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder enabledForCheckout(Boolean value) {
-
-      formData.put("enabled_for_checkout", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder enabledInPortal(Boolean value) {
-
-      formData.put("enabled_in_portal", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder isRecurring(Boolean value) {
-
-      formData.put("is_recurring", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder giftClaimRedirectUrl(String value) {
-
-      formData.put("gift_claim_redirect_url", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder includedInMrr(Boolean value) {
-
-      formData.put("included_in_mrr", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder unit(String value) {
-
-      formData.put("unit", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateBuilder pc2MigrationItemPrices(
-        List<Pc2MigrationItemPricesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          Pc2MigrationItemPricesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "pc2_migration_item_prices[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public Pc2MigrationItemUpdateParams build() {
-      return new Pc2MigrationItemUpdateParams(this);
-    }
-  }
-
-  public static final class Pc2MigrationItemPricesParams {
-
-    private final Map<String, Object> formData;
-
-    private Pc2MigrationItemPricesParams(Pc2MigrationItemPricesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for Pc2MigrationItemPricesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static Pc2MigrationItemPricesBuilder builder() {
-      return new Pc2MigrationItemPricesBuilder();
-    }
-
-    public static final class Pc2MigrationItemPricesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private Pc2MigrationItemPricesBuilder() {}
-
-      public Pc2MigrationItemPricesBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public Pc2MigrationItemPricesBuilder name(String value) {
-
-        formData.put("name", value);
-
-        return this;
-      }
-
-      public Pc2MigrationItemPricesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public Pc2MigrationItemPricesBuilder metadata(String value) {
-
-        formData.put("metadata", value);
-
-        return this;
-      }
-
-      public Pc2MigrationItemPricesBuilder refEntityId(String value) {
-
-        formData.put("ref_entity_id", value);
-
-        return this;
-      }
-
-      public Pc2MigrationItemPricesParams build() {
-        return new Pc2MigrationItemPricesParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyCreateParams.java b/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyCreateParams.java
deleted file mode 100644
index 97f46e8a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyCreateParams.java
+++ /dev/null
@@ -1,78 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.pc2MigrationItemFamily.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class Pc2MigrationItemFamilyCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private Pc2MigrationItemFamilyCreateParams(Pc2MigrationItemFamilyCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for Pc2MigrationItemFamilyCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static Pc2MigrationItemFamilyCreateBuilder builder() {
-    return new Pc2MigrationItemFamilyCreateBuilder();
-  }
-
-  public static final class Pc2MigrationItemFamilyCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private Pc2MigrationItemFamilyCreateBuilder() {}
-
-    public Pc2MigrationItemFamilyCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemFamilyCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemFamilyCreateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemFamilyCreateBuilder isDefault(Boolean value) {
-
-      formData.put("is_default", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemFamilyCreateBuilder pc2MigrationId(String value) {
-
-      formData.put("pc2_migration_id", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemFamilyCreateParams build() {
-      return new Pc2MigrationItemFamilyCreateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyUpdateParams.java
deleted file mode 100644
index 434c0853..00000000
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyUpdateParams.java
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.pc2MigrationItemFamily.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class Pc2MigrationItemFamilyUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private Pc2MigrationItemFamilyUpdateParams(Pc2MigrationItemFamilyUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for Pc2MigrationItemFamilyUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static Pc2MigrationItemFamilyUpdateBuilder builder() {
-    return new Pc2MigrationItemFamilyUpdateBuilder();
-  }
-
-  public static final class Pc2MigrationItemFamilyUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private Pc2MigrationItemFamilyUpdateBuilder() {}
-
-    public Pc2MigrationItemFamilyUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemFamilyUpdateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemFamilyUpdateBuilder isDefault(Boolean value) {
-
-      formData.put("is_default", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemFamilyUpdateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemFamilyUpdateParams build() {
-      return new Pc2MigrationItemFamilyUpdateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceUpdateParams.java
deleted file mode 100644
index 567bc79d..00000000
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceUpdateParams.java
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.pc2MigrationItemPrice.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class Pc2MigrationItemPriceUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private Pc2MigrationItemPriceUpdateParams(Pc2MigrationItemPriceUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for Pc2MigrationItemPriceUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static Pc2MigrationItemPriceUpdateBuilder builder() {
-    return new Pc2MigrationItemPriceUpdateBuilder();
-  }
-
-  public static final class Pc2MigrationItemPriceUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private Pc2MigrationItemPriceUpdateBuilder() {}
-
-    public Pc2MigrationItemPriceUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemPriceUpdateBuilder pc2MigrationItemId(String value) {
-
-      formData.put("pc2_migration_item_id", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemPriceUpdateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemPriceUpdateBuilder metadata(String value) {
-
-      formData.put("metadata", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemPriceUpdateBuilder sanitizedPc1Id(String value) {
-
-      formData.put("sanitized_pc1_id", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemPriceUpdateBuilder isPrimaryAttachedItem(Boolean value) {
-
-      formData.put("is_primary_attached_item", value);
-
-      return this;
-    }
-
-    public Pc2MigrationItemPriceUpdateParams build() {
-      return new Pc2MigrationItemPriceUpdateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/personalizedOffer/params/PersonalizedOfferPersonalizedOffersParams.java b/src/main/java/com/chargebee/v4/core/models/personalizedOffer/params/PersonalizedOfferPersonalizedOffersParams.java
deleted file mode 100644
index fc142325..00000000
--- a/src/main/java/com/chargebee/v4/core/models/personalizedOffer/params/PersonalizedOfferPersonalizedOffersParams.java
+++ /dev/null
@@ -1,178 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.personalizedOffer.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class PersonalizedOfferPersonalizedOffersParams {
-
-  private final Map<String, Object> formData;
-
-  private PersonalizedOfferPersonalizedOffersParams(
-      PersonalizedOfferPersonalizedOffersBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PersonalizedOfferPersonalizedOffersParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PersonalizedOfferPersonalizedOffersBuilder builder() {
-    return new PersonalizedOfferPersonalizedOffersBuilder();
-  }
-
-  public static final class PersonalizedOfferPersonalizedOffersBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PersonalizedOfferPersonalizedOffersBuilder() {}
-
-    public PersonalizedOfferPersonalizedOffersBuilder firstName(String value) {
-
-      formData.put("first_name", value);
-
-      return this;
-    }
-
-    public PersonalizedOfferPersonalizedOffersBuilder lastName(String value) {
-
-      formData.put("last_name", value);
-
-      return this;
-    }
-
-    public PersonalizedOfferPersonalizedOffersBuilder email(String value) {
-
-      formData.put("email", value);
-
-      return this;
-    }
-
-    public PersonalizedOfferPersonalizedOffersBuilder roles(List<String> value) {
-
-      formData.put("roles", value);
-
-      return this;
-    }
-
-    public PersonalizedOfferPersonalizedOffersBuilder externalUserId(String value) {
-
-      formData.put("external_user_id", value);
-
-      return this;
-    }
-
-    public PersonalizedOfferPersonalizedOffersBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public PersonalizedOfferPersonalizedOffersBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PersonalizedOfferPersonalizedOffersBuilder custom(java.util.Map<String, Object> value) {
-
-      formData.put("custom", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public PersonalizedOfferPersonalizedOffersBuilder requestContext(RequestContextParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "request_context[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PersonalizedOfferPersonalizedOffersParams build() {
-      return new PersonalizedOfferPersonalizedOffersParams(this);
-    }
-  }
-
-  public static final class RequestContextParams {
-
-    private final Map<String, Object> formData;
-
-    private RequestContextParams(RequestContextBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for RequestContextParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static RequestContextBuilder builder() {
-      return new RequestContextBuilder();
-    }
-
-    public static final class RequestContextBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private RequestContextBuilder() {}
-
-      public RequestContextBuilder userAgent(String value) {
-
-        formData.put("user_agent", value);
-
-        return this;
-      }
-
-      public RequestContextBuilder locale(String value) {
-
-        formData.put("locale", value);
-
-        return this;
-      }
-
-      public RequestContextBuilder timezone(String value) {
-
-        formData.put("timezone", value);
-
-        return this;
-      }
-
-      public RequestContextBuilder url(String value) {
-
-        formData.put("url", value);
-
-        return this;
-      }
-
-      public RequestContextBuilder referrerUrl(String value) {
-
-        formData.put("referrer_url", value);
-
-        return this;
-      }
-
-      public RequestContextParams build() {
-        return new RequestContextParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanCopyParams.java b/src/main/java/com/chargebee/v4/core/models/plan/params/PlanCopyParams.java
deleted file mode 100644
index d229e3f6..00000000
--- a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanCopyParams.java
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.plan.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PlanCopyParams {
-
-  private final Map<String, Object> formData;
-
-  private PlanCopyParams(PlanCopyBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PlanCopyParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PlanCopyBuilder builder() {
-    return new PlanCopyBuilder();
-  }
-
-  public static final class PlanCopyBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PlanCopyBuilder() {}
-
-    public PlanCopyBuilder fromSite(String value) {
-
-      formData.put("from_site", value);
-
-      return this;
-    }
-
-    public PlanCopyBuilder idAtFromSite(String value) {
-
-      formData.put("id_at_from_site", value);
-
-      return this;
-    }
-
-    public PlanCopyBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public PlanCopyBuilder forSiteMerging(Boolean value) {
-
-      formData.put("for_site_merging", value);
-
-      return this;
-    }
-
-    public PlanCopyParams build() {
-      return new PlanCopyParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanCreateParams.java b/src/main/java/com/chargebee/v4/core/models/plan/params/PlanCreateParams.java
deleted file mode 100644
index a987dfac..00000000
--- a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanCreateParams.java
+++ /dev/null
@@ -1,1125 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.plan.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class PlanCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private PlanCreateParams(PlanCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PlanCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PlanCreateBuilder builder() {
-    return new PlanCreateBuilder();
-  }
-
-  public static final class PlanCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PlanCreateBuilder() {}
-
-    public PlanCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder invoiceName(String value) {
-
-      formData.put("invoice_name", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder trialPeriod(Integer value) {
-
-      formData.put("trial_period", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder trialPeriodUnit(TrialPeriodUnit value) {
-
-      formData.put("trial_period_unit", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder trialEndAction(TrialEndAction value) {
-
-      formData.put("trial_end_action", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder period(Integer value) {
-
-      formData.put("period", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder periodUnit(PeriodUnit value) {
-
-      formData.put("period_unit", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder setupCost(Long value) {
-
-      formData.put("setup_cost", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder price(Long value) {
-
-      formData.put("price", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder priceInDecimal(String value) {
-
-      formData.put("price_in_decimal", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder pricingModel(PricingModel value) {
-
-      formData.put("pricing_model", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public PlanCreateBuilder chargeModel(ChargeModel value) {
-
-      formData.put("charge_model", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder freeQuantity(Integer value) {
-
-      formData.put("free_quantity", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder freeQuantityInDecimal(String value) {
-
-      formData.put("free_quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder addonApplicability(AddonApplicability value) {
-
-      formData.put("addon_applicability", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public PlanCreateBuilder downgradePenalty(Number value) {
-
-      formData.put("downgrade_penalty", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder enabledInHostedPages(Boolean value) {
-
-      formData.put("enabled_in_hosted_pages", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder enabledInPortal(Boolean value) {
-
-      formData.put("enabled_in_portal", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder taxable(Boolean value) {
-
-      formData.put("taxable", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder taxProfileId(String value) {
-
-      formData.put("tax_profile_id", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder taxCode(String value) {
-
-      formData.put("tax_code", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder hsnCode(String value) {
-
-      formData.put("hsn_code", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder taxjarProductCode(String value) {
-
-      formData.put("taxjar_product_code", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder avalaraSaleType(AvalaraSaleType value) {
-
-      formData.put("avalara_sale_type", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder avalaraTransactionType(Integer value) {
-
-      formData.put("avalara_transaction_type", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder avalaraServiceType(Integer value) {
-
-      formData.put("avalara_service_type", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder sku(String value) {
-
-      formData.put("sku", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder accountingCode(String value) {
-
-      formData.put("accounting_code", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder accountingCategory1(String value) {
-
-      formData.put("accounting_category1", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder accountingCategory2(String value) {
-
-      formData.put("accounting_category2", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder accountingCategory3(String value) {
-
-      formData.put("accounting_category3", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder accountingCategory4(String value) {
-
-      formData.put("accounting_category4", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder isShippable(Boolean value) {
-
-      formData.put("is_shippable", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder shippingFrequencyPeriod(Integer value) {
-
-      formData.put("shipping_frequency_period", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder shippingFrequencyPeriodUnit(ShippingFrequencyPeriodUnit value) {
-
-      formData.put("shipping_frequency_period_unit", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public PlanCreateBuilder showDescriptionInInvoices(Boolean value) {
-
-      formData.put("show_description_in_invoices", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder showDescriptionInQuotes(Boolean value) {
-
-      formData.put("show_description_in_quotes", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder giftable(Boolean value) {
-
-      formData.put("giftable", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder claimUrl(String value) {
-
-      formData.put("claim_url", value);
-
-      return this;
-    }
-
-    public PlanCreateBuilder tiers(List<TiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PlanCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PlanCreateBuilder applicableAddons(List<ApplicableAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ApplicableAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "applicable_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PlanCreateBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PlanCreateBuilder attachedAddons(List<AttachedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AttachedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "attached_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public PlanCreateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public PlanCreateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PlanCreateParams build() {
-      return new PlanCreateParams(this);
-    }
-  }
-
-  public enum TrialPeriodUnit {
-    DAY("day"),
-
-    MONTH("month"),
-
-    /** An enum member indicating that TrialPeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TrialPeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TrialPeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TrialPeriodUnit enumValue : TrialPeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TrialEndAction {
-    SITE_DEFAULT("site_default"),
-
-    ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-    CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TrialEndAction(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TrialEndAction fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TrialEndAction enumValue : TrialEndAction.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PeriodUnit enumValue : PeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PricingModel {
-    FLAT_FEE("flat_fee"),
-
-    PER_UNIT("per_unit"),
-
-    TIERED("tiered"),
-
-    VOLUME("volume"),
-
-    STAIRSTEP("stairstep"),
-
-    /** An enum member indicating that PricingModel was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PricingModel(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PricingModel fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PricingModel enumValue : PricingModel.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChargeModel {
-    FLAT_FEE("flat_fee"),
-
-    PER_UNIT("per_unit"),
-
-    TIERED("tiered"),
-
-    VOLUME("volume"),
-
-    STAIRSTEP("stairstep"),
-
-    /** An enum member indicating that ChargeModel was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChargeModel(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChargeModel fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChargeModel enumValue : ChargeModel.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AddonApplicability {
-    ALL("all"),
-
-    RESTRICTED("restricted"),
-
-    /** An enum member indicating that AddonApplicability was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AddonApplicability(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AddonApplicability fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AddonApplicability enumValue : AddonApplicability.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AvalaraSaleType {
-    WHOLESALE("wholesale"),
-
-    RETAIL("retail"),
-
-    CONSUMED("consumed"),
-
-    VENDOR_USE("vendor_use"),
-
-    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AvalaraSaleType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AvalaraSaleType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ShippingFrequencyPeriodUnit {
-    YEAR("year"),
-
-    MONTH("month"),
-
-    WEEK("week"),
-
-    DAY("day"),
-
-    /**
-     * An enum member indicating that ShippingFrequencyPeriodUnit was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    ShippingFrequencyPeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ShippingFrequencyPeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ShippingFrequencyPeriodUnit enumValue : ShippingFrequencyPeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Status {
-    ACTIVE("active"),
-
-    ARCHIVED("archived"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class TiersParams {
-
-    private final Map<String, Object> formData;
-
-    private TiersParams(TiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TiersBuilder builder() {
-      return new TiersBuilder();
-    }
-
-    public static final class TiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TiersBuilder() {}
-
-      public TiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public TiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersParams build() {
-        return new TiersParams(this);
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-
-  public static final class ApplicableAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private ApplicableAddonsParams(ApplicableAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ApplicableAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ApplicableAddonsBuilder builder() {
-      return new ApplicableAddonsBuilder();
-    }
-
-    public static final class ApplicableAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ApplicableAddonsBuilder() {}
-
-      public ApplicableAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public ApplicableAddonsParams build() {
-        return new ApplicableAddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AttachedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AttachedAddonsParams(AttachedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AttachedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AttachedAddonsBuilder builder() {
-      return new AttachedAddonsBuilder();
-    }
-
-    public static final class AttachedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AttachedAddonsBuilder() {}
-
-      public AttachedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AttachedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AttachedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AttachedAddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AttachedAddonsBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      public AttachedAddonsParams build() {
-        return new AttachedAddonsParams(this);
-      }
-    }
-
-    public enum Type {
-      RECOMMENDED("recommended"),
-
-      MANDATORY("mandatory"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/plan/params/PlanDeleteParams.java
deleted file mode 100644
index 18da32bf..00000000
--- a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanDeleteParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.plan.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PlanDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private PlanDeleteParams(PlanDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PlanDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PlanDeleteBuilder builder() {
-    return new PlanDeleteBuilder();
-  }
-
-  public static final class PlanDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PlanDeleteBuilder() {}
-
-    public PlanDeleteParams build() {
-      return new PlanDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanUnarchiveParams.java b/src/main/java/com/chargebee/v4/core/models/plan/params/PlanUnarchiveParams.java
deleted file mode 100644
index f24e2643..00000000
--- a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanUnarchiveParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.plan.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PlanUnarchiveParams {
-
-  private final Map<String, Object> formData;
-
-  private PlanUnarchiveParams(PlanUnarchiveBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PlanUnarchiveParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PlanUnarchiveBuilder builder() {
-    return new PlanUnarchiveBuilder();
-  }
-
-  public static final class PlanUnarchiveBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PlanUnarchiveBuilder() {}
-
-    public PlanUnarchiveParams build() {
-      return new PlanUnarchiveParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/plan/params/PlanUpdateParams.java
deleted file mode 100644
index f363fcb2..00000000
--- a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanUpdateParams.java
+++ /dev/null
@@ -1,1069 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.plan.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class PlanUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private PlanUpdateParams(PlanUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PlanUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PlanUpdateBuilder builder() {
-    return new PlanUpdateBuilder();
-  }
-
-  public static final class PlanUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PlanUpdateBuilder() {}
-
-    public PlanUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder invoiceName(String value) {
-
-      formData.put("invoice_name", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder trialPeriod(Integer value) {
-
-      formData.put("trial_period", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder trialPeriodUnit(TrialPeriodUnit value) {
-
-      formData.put("trial_period_unit", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder trialEndAction(TrialEndAction value) {
-
-      formData.put("trial_end_action", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder period(Integer value) {
-
-      formData.put("period", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder periodUnit(PeriodUnit value) {
-
-      formData.put("period_unit", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder setupCost(Long value) {
-
-      formData.put("setup_cost", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder price(Long value) {
-
-      formData.put("price", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder priceInDecimal(String value) {
-
-      formData.put("price_in_decimal", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder pricingModel(PricingModel value) {
-
-      formData.put("pricing_model", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public PlanUpdateBuilder chargeModel(ChargeModel value) {
-
-      formData.put("charge_model", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder freeQuantity(Integer value) {
-
-      formData.put("free_quantity", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder freeQuantityInDecimal(String value) {
-
-      formData.put("free_quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder addonApplicability(AddonApplicability value) {
-
-      formData.put("addon_applicability", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public PlanUpdateBuilder downgradePenalty(Number value) {
-
-      formData.put("downgrade_penalty", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder enabledInHostedPages(Boolean value) {
-
-      formData.put("enabled_in_hosted_pages", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder enabledInPortal(Boolean value) {
-
-      formData.put("enabled_in_portal", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder taxable(Boolean value) {
-
-      formData.put("taxable", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder taxProfileId(String value) {
-
-      formData.put("tax_profile_id", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder taxCode(String value) {
-
-      formData.put("tax_code", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder hsnCode(String value) {
-
-      formData.put("hsn_code", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder taxjarProductCode(String value) {
-
-      formData.put("taxjar_product_code", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder avalaraSaleType(AvalaraSaleType value) {
-
-      formData.put("avalara_sale_type", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder avalaraTransactionType(Integer value) {
-
-      formData.put("avalara_transaction_type", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder avalaraServiceType(Integer value) {
-
-      formData.put("avalara_service_type", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder sku(String value) {
-
-      formData.put("sku", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder accountingCode(String value) {
-
-      formData.put("accounting_code", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder accountingCategory1(String value) {
-
-      formData.put("accounting_category1", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder accountingCategory2(String value) {
-
-      formData.put("accounting_category2", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder accountingCategory3(String value) {
-
-      formData.put("accounting_category3", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder accountingCategory4(String value) {
-
-      formData.put("accounting_category4", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder isShippable(Boolean value) {
-
-      formData.put("is_shippable", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder shippingFrequencyPeriod(Integer value) {
-
-      formData.put("shipping_frequency_period", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder shippingFrequencyPeriodUnit(ShippingFrequencyPeriodUnit value) {
-
-      formData.put("shipping_frequency_period_unit", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public PlanUpdateBuilder showDescriptionInInvoices(Boolean value) {
-
-      formData.put("show_description_in_invoices", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder showDescriptionInQuotes(Boolean value) {
-
-      formData.put("show_description_in_quotes", value);
-
-      return this;
-    }
-
-    public PlanUpdateBuilder tiers(List<TiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PlanUpdateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PlanUpdateBuilder applicableAddons(List<ApplicableAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ApplicableAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "applicable_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PlanUpdateBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PlanUpdateBuilder attachedAddons(List<AttachedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AttachedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "attached_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public PlanUpdateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public PlanUpdateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PlanUpdateParams build() {
-      return new PlanUpdateParams(this);
-    }
-  }
-
-  public enum TrialPeriodUnit {
-    DAY("day"),
-
-    MONTH("month"),
-
-    /** An enum member indicating that TrialPeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TrialPeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TrialPeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TrialPeriodUnit enumValue : TrialPeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TrialEndAction {
-    SITE_DEFAULT("site_default"),
-
-    ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-    CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TrialEndAction(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TrialEndAction fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TrialEndAction enumValue : TrialEndAction.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PeriodUnit enumValue : PeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PricingModel {
-    FLAT_FEE("flat_fee"),
-
-    PER_UNIT("per_unit"),
-
-    TIERED("tiered"),
-
-    VOLUME("volume"),
-
-    STAIRSTEP("stairstep"),
-
-    /** An enum member indicating that PricingModel was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PricingModel(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PricingModel fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PricingModel enumValue : PricingModel.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChargeModel {
-    FLAT_FEE("flat_fee"),
-
-    PER_UNIT("per_unit"),
-
-    TIERED("tiered"),
-
-    VOLUME("volume"),
-
-    STAIRSTEP("stairstep"),
-
-    /** An enum member indicating that ChargeModel was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChargeModel(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChargeModel fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChargeModel enumValue : ChargeModel.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AddonApplicability {
-    ALL("all"),
-
-    RESTRICTED("restricted"),
-
-    /** An enum member indicating that AddonApplicability was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AddonApplicability(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AddonApplicability fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AddonApplicability enumValue : AddonApplicability.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AvalaraSaleType {
-    WHOLESALE("wholesale"),
-
-    RETAIL("retail"),
-
-    CONSUMED("consumed"),
-
-    VENDOR_USE("vendor_use"),
-
-    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AvalaraSaleType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AvalaraSaleType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ShippingFrequencyPeriodUnit {
-    YEAR("year"),
-
-    MONTH("month"),
-
-    WEEK("week"),
-
-    DAY("day"),
-
-    /**
-     * An enum member indicating that ShippingFrequencyPeriodUnit was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    ShippingFrequencyPeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ShippingFrequencyPeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ShippingFrequencyPeriodUnit enumValue : ShippingFrequencyPeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class TiersParams {
-
-    private final Map<String, Object> formData;
-
-    private TiersParams(TiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TiersBuilder builder() {
-      return new TiersBuilder();
-    }
-
-    public static final class TiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TiersBuilder() {}
-
-      public TiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public TiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersParams build() {
-        return new TiersParams(this);
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-
-  public static final class ApplicableAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private ApplicableAddonsParams(ApplicableAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ApplicableAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ApplicableAddonsBuilder builder() {
-      return new ApplicableAddonsBuilder();
-    }
-
-    public static final class ApplicableAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ApplicableAddonsBuilder() {}
-
-      public ApplicableAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public ApplicableAddonsParams build() {
-        return new ApplicableAddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AttachedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AttachedAddonsParams(AttachedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AttachedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AttachedAddonsBuilder builder() {
-      return new AttachedAddonsBuilder();
-    }
-
-    public static final class AttachedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AttachedAddonsBuilder() {}
-
-      public AttachedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AttachedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AttachedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AttachedAddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AttachedAddonsBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      public AttachedAddonsParams build() {
-        return new AttachedAddonsParams(this);
-      }
-    }
-
-    public enum Type {
-      RECOMMENDED("recommended"),
-
-      MANDATORY("mandatory"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/portalSession/params/PortalSessionCreateParams.java b/src/main/java/com/chargebee/v4/core/models/portalSession/params/PortalSessionCreateParams.java
deleted file mode 100644
index 64549205..00000000
--- a/src/main/java/com/chargebee/v4/core/models/portalSession/params/PortalSessionCreateParams.java
+++ /dev/null
@@ -1,105 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.portalSession.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PortalSessionCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private PortalSessionCreateParams(PortalSessionCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PortalSessionCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PortalSessionCreateBuilder builder() {
-    return new PortalSessionCreateBuilder();
-  }
-
-  public static final class PortalSessionCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PortalSessionCreateBuilder() {}
-
-    public PortalSessionCreateBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public PortalSessionCreateBuilder forwardUrl(String value) {
-
-      formData.put("forward_url", value);
-
-      return this;
-    }
-
-    public PortalSessionCreateBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PortalSessionCreateParams build() {
-      return new PortalSessionCreateParams(this);
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantCreateParams.java b/src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantCreateParams.java
deleted file mode 100644
index 8a834cae..00000000
--- a/src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantCreateParams.java
+++ /dev/null
@@ -1,146 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.priceVariant.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class PriceVariantCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private PriceVariantCreateParams(PriceVariantCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PriceVariantCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PriceVariantCreateBuilder builder() {
-    return new PriceVariantCreateBuilder();
-  }
-
-  public static final class PriceVariantCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PriceVariantCreateBuilder() {}
-
-    public PriceVariantCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public PriceVariantCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public PriceVariantCreateBuilder externalName(String value) {
-
-      formData.put("external_name", value);
-
-      return this;
-    }
-
-    public PriceVariantCreateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public PriceVariantCreateBuilder variantGroup(String value) {
-
-      formData.put("variant_group", value);
-
-      return this;
-    }
-
-    public PriceVariantCreateBuilder businessEntityId(String value) {
-
-      formData.put("business_entity_id", value);
-
-      return this;
-    }
-
-    public PriceVariantCreateBuilder attributes(List<AttributesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AttributesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "attributes[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PriceVariantCreateParams build() {
-      return new PriceVariantCreateParams(this);
-    }
-  }
-
-  public static final class AttributesParams {
-
-    private final Map<String, Object> formData;
-
-    private AttributesParams(AttributesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AttributesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AttributesBuilder builder() {
-      return new AttributesBuilder();
-    }
-
-    public static final class AttributesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AttributesBuilder() {}
-
-      public AttributesBuilder name(String value) {
-
-        formData.put("name", value);
-
-        return this;
-      }
-
-      public AttributesBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public AttributesParams build() {
-        return new AttributesParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantUpdateParams.java
deleted file mode 100644
index 5bcf28d9..00000000
--- a/src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantUpdateParams.java
+++ /dev/null
@@ -1,167 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.priceVariant.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class PriceVariantUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private PriceVariantUpdateParams(PriceVariantUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PriceVariantUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PriceVariantUpdateBuilder builder() {
-    return new PriceVariantUpdateBuilder();
-  }
-
-  public static final class PriceVariantUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PriceVariantUpdateBuilder() {}
-
-    public PriceVariantUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public PriceVariantUpdateBuilder externalName(String value) {
-
-      formData.put("external_name", value);
-
-      return this;
-    }
-
-    public PriceVariantUpdateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public PriceVariantUpdateBuilder variantGroup(String value) {
-
-      formData.put("variant_group", value);
-
-      return this;
-    }
-
-    public PriceVariantUpdateBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public PriceVariantUpdateBuilder attributes(List<AttributesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AttributesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "attributes[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PriceVariantUpdateParams build() {
-      return new PriceVariantUpdateParams(this);
-    }
-  }
-
-  public enum Status {
-    ACTIVE("active"),
-
-    ARCHIVED("archived"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class AttributesParams {
-
-    private final Map<String, Object> formData;
-
-    private AttributesParams(AttributesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AttributesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AttributesBuilder builder() {
-      return new AttributesBuilder();
-    }
-
-    public static final class AttributesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AttributesBuilder() {}
-
-      public AttributesBuilder name(String value) {
-
-        formData.put("name", value);
-
-        return this;
-      }
-
-      public AttributesBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public AttributesParams build() {
-        return new AttributesParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/pricingPageSession/params/PricingPageSessionCreateForExistingSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/pricingPageSession/params/PricingPageSessionCreateForExistingSubscriptionParams.java
deleted file mode 100644
index b1530b3f..00000000
--- a/src/main/java/com/chargebee/v4/core/models/pricingPageSession/params/PricingPageSessionCreateForExistingSubscriptionParams.java
+++ /dev/null
@@ -1,357 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.pricingPageSession.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class PricingPageSessionCreateForExistingSubscriptionParams {
-
-  private final Map<String, Object> formData;
-
-  private PricingPageSessionCreateForExistingSubscriptionParams(
-      PricingPageSessionCreateForExistingSubscriptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PricingPageSessionCreateForExistingSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PricingPageSessionCreateForExistingSubscriptionBuilder builder() {
-    return new PricingPageSessionCreateForExistingSubscriptionBuilder();
-  }
-
-  public static final class PricingPageSessionCreateForExistingSubscriptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PricingPageSessionCreateForExistingSubscriptionBuilder() {}
-
-    public PricingPageSessionCreateForExistingSubscriptionBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public PricingPageSessionCreateForExistingSubscriptionBuilder pricingPage(
-        PricingPageParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "pricing_page[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PricingPageSessionCreateForExistingSubscriptionBuilder subscription(
-        SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PricingPageSessionCreateForExistingSubscriptionBuilder discounts(
-        List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PricingPageSessionCreateForExistingSubscriptionParams build() {
-      return new PricingPageSessionCreateForExistingSubscriptionParams(this);
-    }
-  }
-
-  public static final class PricingPageParams {
-
-    private final Map<String, Object> formData;
-
-    private PricingPageParams(PricingPageBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PricingPageParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PricingPageBuilder builder() {
-      return new PricingPageBuilder();
-    }
-
-    public static final class PricingPageBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PricingPageBuilder() {}
-
-      public PricingPageBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PricingPageParams build() {
-        return new PricingPageParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder label(String value) {
-
-        formData.put("label", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/pricingPageSession/params/PricingPageSessionCreateForNewSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/pricingPageSession/params/PricingPageSessionCreateForNewSubscriptionParams.java
deleted file mode 100644
index 95e36d0b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/pricingPageSession/params/PricingPageSessionCreateForNewSubscriptionParams.java
+++ /dev/null
@@ -1,797 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.pricingPageSession.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class PricingPageSessionCreateForNewSubscriptionParams {
-
-  private final Map<String, Object> formData;
-
-  private PricingPageSessionCreateForNewSubscriptionParams(
-      PricingPageSessionCreateForNewSubscriptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PricingPageSessionCreateForNewSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PricingPageSessionCreateForNewSubscriptionBuilder builder() {
-    return new PricingPageSessionCreateForNewSubscriptionBuilder();
-  }
-
-  public static final class PricingPageSessionCreateForNewSubscriptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PricingPageSessionCreateForNewSubscriptionBuilder() {}
-
-    public PricingPageSessionCreateForNewSubscriptionBuilder redirectUrl(String value) {
-
-      formData.put("redirect_url", value);
-
-      return this;
-    }
-
-    public PricingPageSessionCreateForNewSubscriptionBuilder businessEntityId(String value) {
-
-      formData.put("business_entity_id", value);
-
-      return this;
-    }
-
-    public PricingPageSessionCreateForNewSubscriptionBuilder pricingPage(PricingPageParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "pricing_page[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PricingPageSessionCreateForNewSubscriptionBuilder subscription(
-        SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PricingPageSessionCreateForNewSubscriptionBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PricingPageSessionCreateForNewSubscriptionBuilder billingAddress(
-        BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PricingPageSessionCreateForNewSubscriptionBuilder shippingAddress(
-        ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PricingPageSessionCreateForNewSubscriptionBuilder discounts(
-        List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PricingPageSessionCreateForNewSubscriptionParams build() {
-      return new PricingPageSessionCreateForNewSubscriptionParams(this);
-    }
-  }
-
-  public static final class PricingPageParams {
-
-    private final Map<String, Object> formData;
-
-    private PricingPageParams(PricingPageBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PricingPageParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PricingPageBuilder builder() {
-      return new PricingPageBuilder();
-    }
-
-    public static final class PricingPageBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PricingPageBuilder() {}
-
-      public PricingPageBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PricingPageParams build() {
-        return new PricingPageParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public CustomerBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public CustomerBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public CustomerBuilder locale(String value) {
-
-        formData.put("locale", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder label(String value) {
-
-        formData.put("label", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/product/params/ProductCreateParams.java b/src/main/java/com/chargebee/v4/core/models/product/params/ProductCreateParams.java
deleted file mode 100644
index 2868fb88..00000000
--- a/src/main/java/com/chargebee/v4/core/models/product/params/ProductCreateParams.java
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.product.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ProductCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private ProductCreateParams(ProductCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ProductCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ProductCreateBuilder builder() {
-    return new ProductCreateBuilder();
-  }
-
-  public static final class ProductCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ProductCreateBuilder() {}
-
-    public ProductCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public ProductCreateBuilder externalName(String value) {
-
-      formData.put("external_name", value);
-
-      return this;
-    }
-
-    public ProductCreateBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public ProductCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public ProductCreateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public ProductCreateBuilder sku(String value) {
-
-      formData.put("sku", value);
-
-      return this;
-    }
-
-    public ProductCreateBuilder metadata(java.util.Map<String, Object> value) {
-
-      formData.put("metadata", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public ProductCreateBuilder shippable(Boolean value) {
-
-      formData.put("shippable", value);
-
-      return this;
-    }
-
-    public ProductCreateParams build() {
-      return new ProductCreateParams(this);
-    }
-  }
-
-  public enum Status {
-    ACTIVE("active"),
-
-    INACTIVE("inactive"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/product/params/ProductDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/product/params/ProductDeleteParams.java
deleted file mode 100644
index a99204e4..00000000
--- a/src/main/java/com/chargebee/v4/core/models/product/params/ProductDeleteParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.product.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ProductDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private ProductDeleteParams(ProductDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ProductDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ProductDeleteBuilder builder() {
-    return new ProductDeleteBuilder();
-  }
-
-  public static final class ProductDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ProductDeleteBuilder() {}
-
-    public ProductDeleteParams build() {
-      return new ProductDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/product/params/ProductUpdateOptionsParams.java b/src/main/java/com/chargebee/v4/core/models/product/params/ProductUpdateOptionsParams.java
deleted file mode 100644
index 6a51dacb..00000000
--- a/src/main/java/com/chargebee/v4/core/models/product/params/ProductUpdateOptionsParams.java
+++ /dev/null
@@ -1,119 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.product.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class ProductUpdateOptionsParams {
-
-  private final Map<String, Object> formData;
-
-  private ProductUpdateOptionsParams(ProductUpdateOptionsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ProductUpdateOptionsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ProductUpdateOptionsBuilder builder() {
-    return new ProductUpdateOptionsBuilder();
-  }
-
-  public static final class ProductUpdateOptionsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ProductUpdateOptionsBuilder() {}
-
-    public ProductUpdateOptionsBuilder removeOptions(List<String> value) {
-
-      formData.put("remove_options", value);
-
-      return this;
-    }
-
-    public ProductUpdateOptionsBuilder options(List<OptionsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          OptionsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "options[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public ProductUpdateOptionsParams build() {
-      return new ProductUpdateOptionsParams(this);
-    }
-  }
-
-  public static final class OptionsParams {
-
-    private final Map<String, Object> formData;
-
-    private OptionsParams(OptionsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for OptionsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static OptionsBuilder builder() {
-      return new OptionsBuilder();
-    }
-
-    public static final class OptionsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private OptionsBuilder() {}
-
-      public OptionsBuilder name(String value) {
-
-        formData.put("name", value);
-
-        return this;
-      }
-
-      public OptionsBuilder values(List<Object> value) {
-
-        formData.put("values", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public OptionsBuilder defaultValue(String value) {
-
-        formData.put("default_value", value);
-
-        return this;
-      }
-
-      public OptionsParams build() {
-        return new OptionsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/product/params/ProductUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/product/params/ProductUpdateParams.java
deleted file mode 100644
index 2b2c2340..00000000
--- a/src/main/java/com/chargebee/v4/core/models/product/params/ProductUpdateParams.java
+++ /dev/null
@@ -1,121 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.product.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ProductUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private ProductUpdateParams(ProductUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ProductUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ProductUpdateBuilder builder() {
-    return new ProductUpdateBuilder();
-  }
-
-  public static final class ProductUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ProductUpdateBuilder() {}
-
-    public ProductUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public ProductUpdateBuilder externalName(String value) {
-
-      formData.put("external_name", value);
-
-      return this;
-    }
-
-    public ProductUpdateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public ProductUpdateBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public ProductUpdateBuilder sku(String value) {
-
-      formData.put("sku", value);
-
-      return this;
-    }
-
-    public ProductUpdateBuilder shippable(Boolean value) {
-
-      formData.put("shippable", value);
-
-      return this;
-    }
-
-    public ProductUpdateBuilder metadata(java.util.Map<String, Object> value) {
-
-      formData.put("metadata", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public ProductUpdateParams build() {
-      return new ProductUpdateParams(this);
-    }
-  }
-
-  public enum Status {
-    ACTIVE("active"),
-
-    INACTIVE("inactive"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditAddParams.java b/src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditAddParams.java
deleted file mode 100644
index 584093b8..00000000
--- a/src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditAddParams.java
+++ /dev/null
@@ -1,122 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.promotionalCredit.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PromotionalCreditAddParams {
-
-  private final Map<String, Object> formData;
-
-  private PromotionalCreditAddParams(PromotionalCreditAddBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PromotionalCreditAddParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PromotionalCreditAddBuilder builder() {
-    return new PromotionalCreditAddBuilder();
-  }
-
-  public static final class PromotionalCreditAddBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PromotionalCreditAddBuilder() {}
-
-    public PromotionalCreditAddBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PromotionalCreditAddBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public PromotionalCreditAddBuilder amountInDecimal(String value) {
-
-      formData.put("amount_in_decimal", value);
-
-      return this;
-    }
-
-    public PromotionalCreditAddBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public PromotionalCreditAddBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public PromotionalCreditAddBuilder creditType(CreditType value) {
-
-      formData.put("credit_type", value);
-
-      return this;
-    }
-
-    public PromotionalCreditAddBuilder reference(String value) {
-
-      formData.put("reference", value);
-
-      return this;
-    }
-
-    public PromotionalCreditAddParams build() {
-      return new PromotionalCreditAddParams(this);
-    }
-  }
-
-  public enum CreditType {
-    LOYALTY_CREDITS("loyalty_credits"),
-
-    REFERRAL_REWARDS("referral_rewards"),
-
-    GENERAL("general"),
-
-    /** An enum member indicating that CreditType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CreditType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CreditType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CreditType enumValue : CreditType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditDeductParams.java b/src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditDeductParams.java
deleted file mode 100644
index fb875132..00000000
--- a/src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditDeductParams.java
+++ /dev/null
@@ -1,122 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.promotionalCredit.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PromotionalCreditDeductParams {
-
-  private final Map<String, Object> formData;
-
-  private PromotionalCreditDeductParams(PromotionalCreditDeductBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PromotionalCreditDeductParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PromotionalCreditDeductBuilder builder() {
-    return new PromotionalCreditDeductBuilder();
-  }
-
-  public static final class PromotionalCreditDeductBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PromotionalCreditDeductBuilder() {}
-
-    public PromotionalCreditDeductBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PromotionalCreditDeductBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public PromotionalCreditDeductBuilder amountInDecimal(String value) {
-
-      formData.put("amount_in_decimal", value);
-
-      return this;
-    }
-
-    public PromotionalCreditDeductBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public PromotionalCreditDeductBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public PromotionalCreditDeductBuilder creditType(CreditType value) {
-
-      formData.put("credit_type", value);
-
-      return this;
-    }
-
-    public PromotionalCreditDeductBuilder reference(String value) {
-
-      formData.put("reference", value);
-
-      return this;
-    }
-
-    public PromotionalCreditDeductParams build() {
-      return new PromotionalCreditDeductParams(this);
-    }
-  }
-
-  public enum CreditType {
-    LOYALTY_CREDITS("loyalty_credits"),
-
-    REFERRAL_REWARDS("referral_rewards"),
-
-    GENERAL("general"),
-
-    /** An enum member indicating that CreditType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CreditType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CreditType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CreditType enumValue : CreditType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditSetParams.java b/src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditSetParams.java
deleted file mode 100644
index a7b41ea2..00000000
--- a/src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditSetParams.java
+++ /dev/null
@@ -1,122 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.promotionalCredit.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class PromotionalCreditSetParams {
-
-  private final Map<String, Object> formData;
-
-  private PromotionalCreditSetParams(PromotionalCreditSetBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PromotionalCreditSetParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PromotionalCreditSetBuilder builder() {
-    return new PromotionalCreditSetBuilder();
-  }
-
-  public static final class PromotionalCreditSetBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PromotionalCreditSetBuilder() {}
-
-    public PromotionalCreditSetBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PromotionalCreditSetBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public PromotionalCreditSetBuilder amountInDecimal(String value) {
-
-      formData.put("amount_in_decimal", value);
-
-      return this;
-    }
-
-    public PromotionalCreditSetBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public PromotionalCreditSetBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public PromotionalCreditSetBuilder creditType(CreditType value) {
-
-      formData.put("credit_type", value);
-
-      return this;
-    }
-
-    public PromotionalCreditSetBuilder reference(String value) {
-
-      formData.put("reference", value);
-
-      return this;
-    }
-
-    public PromotionalCreditSetParams build() {
-      return new PromotionalCreditSetParams(this);
-    }
-  }
-
-  public enum CreditType {
-    LOYALTY_CREDITS("loyalty_credits"),
-
-    REFERRAL_REWARDS("referral_rewards"),
-
-    GENERAL("general"),
-
-    /** An enum member indicating that CreditType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CreditType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CreditType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CreditType enumValue : CreditType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/purchase/params/PurchaseCreateParams.java b/src/main/java/com/chargebee/v4/core/models/purchase/params/PurchaseCreateParams.java
deleted file mode 100644
index b2688e82..00000000
--- a/src/main/java/com/chargebee/v4/core/models/purchase/params/PurchaseCreateParams.java
+++ /dev/null
@@ -1,1017 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.purchase.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class PurchaseCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private PurchaseCreateParams(PurchaseCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PurchaseCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PurchaseCreateBuilder builder() {
-    return new PurchaseCreateBuilder();
-  }
-
-  public static final class PurchaseCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PurchaseCreateBuilder() {}
-
-    public PurchaseCreateBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PurchaseCreateBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public PurchaseCreateBuilder replacePrimaryPaymentSource(Boolean value) {
-
-      formData.put("replace_primary_payment_source", value);
-
-      return this;
-    }
-
-    public PurchaseCreateBuilder invoiceInfo(InvoiceInfoParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "invoice_info[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PurchaseCreateBuilder paymentSchedule(PaymentScheduleParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_schedule[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PurchaseCreateBuilder statementDescriptor(StatementDescriptorParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PurchaseCreateBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PurchaseCreateBuilder purchaseItems(List<PurchaseItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          PurchaseItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "purchase_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PurchaseCreateBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PurchaseCreateBuilder shippingAddresses(List<ShippingAddressesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ShippingAddressesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "shipping_addresses[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PurchaseCreateBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PurchaseCreateBuilder subscriptionInfo(List<SubscriptionInfoParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionInfoParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_info[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PurchaseCreateBuilder contractTerms(List<ContractTermsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ContractTermsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "contract_terms[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PurchaseCreateParams build() {
-      return new PurchaseCreateParams(this);
-    }
-  }
-
-  public static final class InvoiceInfoParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceInfoParams(InvoiceInfoBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceInfoParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceInfoBuilder builder() {
-      return new InvoiceInfoBuilder();
-    }
-
-    public static final class InvoiceInfoBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceInfoBuilder() {}
-
-      public InvoiceInfoBuilder poNumber(String value) {
-
-        formData.put("po_number", value);
-
-        return this;
-      }
-
-      public InvoiceInfoBuilder notes(String value) {
-
-        formData.put("notes", value);
-
-        return this;
-      }
-
-      public InvoiceInfoParams build() {
-        return new InvoiceInfoParams(this);
-      }
-    }
-  }
-
-  public static final class PaymentScheduleParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentScheduleParams(PaymentScheduleBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentScheduleParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentScheduleBuilder builder() {
-      return new PaymentScheduleBuilder();
-    }
-
-    public static final class PaymentScheduleBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentScheduleBuilder() {}
-
-      public PaymentScheduleBuilder schemeId(String value) {
-
-        formData.put("scheme_id", value);
-
-        return this;
-      }
-
-      public PaymentScheduleBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public PaymentScheduleParams build() {
-        return new PaymentScheduleParams(this);
-      }
-    }
-  }
-
-  public static final class StatementDescriptorParams {
-
-    private final Map<String, Object> formData;
-
-    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatementDescriptorParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatementDescriptorBuilder builder() {
-      return new StatementDescriptorBuilder();
-    }
-
-    public static final class StatementDescriptorBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatementDescriptorBuilder() {}
-
-      public StatementDescriptorBuilder descriptor(String value) {
-
-        formData.put("descriptor", value);
-
-        return this;
-      }
-
-      public StatementDescriptorParams build() {
-        return new StatementDescriptorParams(this);
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PurchaseItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private PurchaseItemsParams(PurchaseItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PurchaseItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PurchaseItemsBuilder builder() {
-      return new PurchaseItemsBuilder();
-    }
-
-    public static final class PurchaseItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PurchaseItemsBuilder() {}
-
-      public PurchaseItemsBuilder index(Integer value) {
-
-        formData.put("index", value);
-
-        return this;
-      }
-
-      public PurchaseItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public PurchaseItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public PurchaseItemsBuilder unitAmount(Integer value) {
-
-        formData.put("unit_amount", value);
-
-        return this;
-      }
-
-      public PurchaseItemsBuilder unitAmountInDecimal(String value) {
-
-        formData.put("unit_amount_in_decimal", value);
-
-        return this;
-      }
-
-      public PurchaseItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public PurchaseItemsParams build() {
-        return new PurchaseItemsParams(this);
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder index(Integer value) {
-
-        formData.put("index", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-  }
-
-  public static final class ShippingAddressesParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressesParams(ShippingAddressesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressesBuilder builder() {
-      return new ShippingAddressesBuilder();
-    }
-
-    public static final class ShippingAddressesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressesBuilder() {}
-
-      public ShippingAddressesBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressesParams build() {
-        return new ShippingAddressesParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder index(Integer value) {
-
-        formData.put("index", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder couponId(String value) {
-
-        formData.put("coupon_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionInfoParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionInfoParams(SubscriptionInfoBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionInfoParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionInfoBuilder builder() {
-      return new SubscriptionInfoBuilder();
-    }
-
-    public static final class SubscriptionInfoBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionInfoBuilder() {}
-
-      public SubscriptionInfoBuilder index(Integer value) {
-
-        formData.put("index", value);
-
-        return this;
-      }
-
-      public SubscriptionInfoBuilder subscriptionId(String value) {
-
-        formData.put("subscription_id", value);
-
-        return this;
-      }
-
-      public SubscriptionInfoBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionInfoBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionInfoBuilder metaData(java.util.Map<String, Object> value) {
-
-        formData.put("meta_data", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public SubscriptionInfoParams build() {
-        return new SubscriptionInfoParams(this);
-      }
-    }
-  }
-
-  public static final class ContractTermsParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermsParams(ContractTermsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermsBuilder builder() {
-      return new ContractTermsBuilder();
-    }
-
-    public static final class ContractTermsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermsBuilder() {}
-
-      public ContractTermsBuilder index(Integer value) {
-
-        formData.put("index", value);
-
-        return this;
-      }
-
-      public ContractTermsBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermsBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermsParams build() {
-        return new ContractTermsParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/purchase/params/PurchaseEstimateParams.java b/src/main/java/com/chargebee/v4/core/models/purchase/params/PurchaseEstimateParams.java
deleted file mode 100644
index 28465b20..00000000
--- a/src/main/java/com/chargebee/v4/core/models/purchase/params/PurchaseEstimateParams.java
+++ /dev/null
@@ -1,1034 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.purchase.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class PurchaseEstimateParams {
-
-  private final Map<String, Object> formData;
-
-  private PurchaseEstimateParams(PurchaseEstimateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for PurchaseEstimateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static PurchaseEstimateBuilder builder() {
-    return new PurchaseEstimateBuilder();
-  }
-
-  public static final class PurchaseEstimateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private PurchaseEstimateBuilder() {}
-
-    public PurchaseEstimateBuilder clientProfileId(String value) {
-
-      formData.put("client_profile_id", value);
-
-      return this;
-    }
-
-    public PurchaseEstimateBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public PurchaseEstimateBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PurchaseEstimateBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public PurchaseEstimateBuilder purchaseItems(List<PurchaseItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          PurchaseItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "purchase_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PurchaseEstimateBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PurchaseEstimateBuilder shippingAddresses(List<ShippingAddressesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ShippingAddressesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "shipping_addresses[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PurchaseEstimateBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PurchaseEstimateBuilder subscriptionInfo(List<SubscriptionInfoParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionInfoParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_info[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PurchaseEstimateBuilder contractTerms(List<ContractTermsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ContractTermsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "contract_terms[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public PurchaseEstimateParams build() {
-      return new PurchaseEstimateParams(this);
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder registeredForGst(Boolean value) {
-
-        formData.put("registered_for_gst", value);
-
-        return this;
-      }
-
-      public CustomerBuilder taxability(Taxability value) {
-
-        formData.put("taxability", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityCode(EntityCode value) {
-
-        formData.put("entity_code", value);
-
-        return this;
-      }
-
-      public CustomerBuilder exemptNumber(String value) {
-
-        formData.put("exempt_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder exemptionDetails(List<Object> value) {
-
-        formData.put("exemption_details", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CustomerBuilder customerType(CustomerType value) {
-
-        formData.put("customer_type", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-
-    public enum Taxability {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Taxability was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Taxability(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Taxability fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Taxability enumValue : Taxability.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum EntityCode {
-      A("a"),
-
-      B("b"),
-
-      C("c"),
-
-      D("d"),
-
-      E("e"),
-
-      F("f"),
-
-      G("g"),
-
-      H("h"),
-
-      I("i"),
-
-      J("j"),
-
-      K("k"),
-
-      L("l"),
-
-      M("m"),
-
-      N("n"),
-
-      P("p"),
-
-      Q("q"),
-
-      R("r"),
-
-      MED_1("med1"),
-
-      MED_2("med2"),
-
-      /** An enum member indicating that EntityCode was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityCode(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityCode fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityCode enumValue : EntityCode.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum CustomerType {
-      RESIDENTIAL("residential"),
-
-      BUSINESS("business"),
-
-      SENIOR_CITIZEN("senior_citizen"),
-
-      INDUSTRIAL("industrial"),
-
-      /** An enum member indicating that CustomerType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      CustomerType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static CustomerType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (CustomerType enumValue : CustomerType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PurchaseItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private PurchaseItemsParams(PurchaseItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PurchaseItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PurchaseItemsBuilder builder() {
-      return new PurchaseItemsBuilder();
-    }
-
-    public static final class PurchaseItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PurchaseItemsBuilder() {}
-
-      public PurchaseItemsBuilder index(Integer value) {
-
-        formData.put("index", value);
-
-        return this;
-      }
-
-      public PurchaseItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public PurchaseItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public PurchaseItemsBuilder unitAmount(Integer value) {
-
-        formData.put("unit_amount", value);
-
-        return this;
-      }
-
-      public PurchaseItemsBuilder unitAmountInDecimal(String value) {
-
-        formData.put("unit_amount_in_decimal", value);
-
-        return this;
-      }
-
-      public PurchaseItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public PurchaseItemsParams build() {
-        return new PurchaseItemsParams(this);
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder index(Integer value) {
-
-        formData.put("index", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-  }
-
-  public static final class ShippingAddressesParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressesParams(ShippingAddressesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressesBuilder builder() {
-      return new ShippingAddressesBuilder();
-    }
-
-    public static final class ShippingAddressesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressesBuilder() {}
-
-      public ShippingAddressesBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressesBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressesParams build() {
-        return new ShippingAddressesParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder index(Integer value) {
-
-        formData.put("index", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder couponId(String value) {
-
-        formData.put("coupon_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionInfoParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionInfoParams(SubscriptionInfoBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionInfoParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionInfoBuilder builder() {
-      return new SubscriptionInfoBuilder();
-    }
-
-    public static final class SubscriptionInfoBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionInfoBuilder() {}
-
-      public SubscriptionInfoBuilder index(Integer value) {
-
-        formData.put("index", value);
-
-        return this;
-      }
-
-      public SubscriptionInfoBuilder subscriptionId(String value) {
-
-        formData.put("subscription_id", value);
-
-        return this;
-      }
-
-      public SubscriptionInfoBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionInfoBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionInfoParams build() {
-        return new SubscriptionInfoParams(this);
-      }
-    }
-  }
-
-  public static final class ContractTermsParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermsParams(ContractTermsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermsBuilder builder() {
-      return new ContractTermsBuilder();
-    }
-
-    public static final class ContractTermsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermsBuilder() {}
-
-      public ContractTermsBuilder index(Integer value) {
-
-        formData.put("index", value);
-
-        return this;
-      }
-
-      public ContractTermsBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermsBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermsParams build() {
-        return new ContractTermsParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteConvertParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteConvertParams.java
deleted file mode 100644
index 35617a99..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteConvertParams.java
+++ /dev/null
@@ -1,169 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class QuoteConvertParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteConvertParams(QuoteConvertBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteConvertParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteConvertBuilder builder() {
-    return new QuoteConvertBuilder();
-  }
-
-  public static final class QuoteConvertBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteConvertBuilder() {}
-
-    public QuoteConvertBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public QuoteConvertBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public QuoteConvertBuilder createPendingInvoices(Boolean value) {
-
-      formData.put("create_pending_invoices", value);
-
-      return this;
-    }
-
-    public QuoteConvertBuilder firstInvoicePending(Boolean value) {
-
-      formData.put("first_invoice_pending", value);
-
-      return this;
-    }
-
-    public QuoteConvertBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteConvertParams build() {
-      return new QuoteConvertParams(this);
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder autoCollection(AutoCollection value) {
-
-        formData.put("auto_collection", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder poNumber(String value) {
-
-        formData.put("po_number", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder autoCloseInvoices(Boolean value) {
-
-        formData.put("auto_close_invoices", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum AutoCollection {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AutoCollection(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AutoCollection fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AutoCollection enumValue : AutoCollection.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteCreateForChargeItemsAndChargesParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteCreateForChargeItemsAndChargesParams.java
deleted file mode 100644
index dc7d91f7..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteCreateForChargeItemsAndChargesParams.java
+++ /dev/null
@@ -1,975 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class QuoteCreateForChargeItemsAndChargesParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteCreateForChargeItemsAndChargesParams(
-      QuoteCreateForChargeItemsAndChargesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteCreateForChargeItemsAndChargesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteCreateForChargeItemsAndChargesBuilder builder() {
-    return new QuoteCreateForChargeItemsAndChargesBuilder();
-  }
-
-  public static final class QuoteCreateForChargeItemsAndChargesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteCreateForChargeItemsAndChargesBuilder() {}
-
-    public QuoteCreateForChargeItemsAndChargesBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder notes(String value) {
-
-      formData.put("notes", value);
-
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder expiresAt(Timestamp value) {
-
-      formData.put("expires_at", value);
-
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder itemPrices(List<ItemPricesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemPricesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_prices[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder charges(List<ChargesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesBuilder taxProvidersFields(
-        List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateForChargeItemsAndChargesParams build() {
-      return new QuoteCreateForChargeItemsAndChargesParams(this);
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemPricesParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemPricesParams(ItemPricesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemPricesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemPricesBuilder builder() {
-      return new ItemPricesBuilder();
-    }
-
-    public static final class ItemPricesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemPricesBuilder() {}
-
-      public ItemPricesBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public ItemPricesParams build() {
-        return new ItemPricesParams(this);
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChargesParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargesParams(ChargesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargesBuilder builder() {
-      return new ChargesBuilder();
-    }
-
-    public static final class ChargesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargesBuilder() {}
-
-      public ChargesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public ChargesBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public ChargesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder servicePeriod(Integer value) {
-
-        formData.put("service_period", value);
-
-        return this;
-      }
-
-      public ChargesParams build() {
-        return new ChargesParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteCreateForOnetimeChargesParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteCreateForOnetimeChargesParams.java
deleted file mode 100644
index 6c6f2c3f..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteCreateForOnetimeChargesParams.java
+++ /dev/null
@@ -1,555 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class QuoteCreateForOnetimeChargesParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteCreateForOnetimeChargesParams(QuoteCreateForOnetimeChargesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteCreateForOnetimeChargesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteCreateForOnetimeChargesBuilder builder() {
-    return new QuoteCreateForOnetimeChargesBuilder();
-  }
-
-  public static final class QuoteCreateForOnetimeChargesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteCreateForOnetimeChargesBuilder() {}
-
-    public QuoteCreateForOnetimeChargesBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public QuoteCreateForOnetimeChargesBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public QuoteCreateForOnetimeChargesBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public QuoteCreateForOnetimeChargesBuilder notes(String value) {
-
-      formData.put("notes", value);
-
-      return this;
-    }
-
-    public QuoteCreateForOnetimeChargesBuilder expiresAt(Timestamp value) {
-
-      formData.put("expires_at", value);
-
-      return this;
-    }
-
-    public QuoteCreateForOnetimeChargesBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public QuoteCreateForOnetimeChargesBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public QuoteCreateForOnetimeChargesBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public QuoteCreateForOnetimeChargesBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateForOnetimeChargesBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateForOnetimeChargesBuilder charges(List<ChargesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateForOnetimeChargesBuilder taxProvidersFields(
-        List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateForOnetimeChargesParams build() {
-      return new QuoteCreateForOnetimeChargesParams(this);
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder servicePeriod(Integer value) {
-
-        formData.put("service_period", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class ChargesParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargesParams(ChargesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargesBuilder builder() {
-      return new ChargesBuilder();
-    }
-
-    public static final class ChargesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargesBuilder() {}
-
-      public ChargesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public ChargesBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public ChargesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder servicePeriod(Integer value) {
-
-        formData.put("service_period", value);
-
-        return this;
-      }
-
-      public ChargesParams build() {
-        return new ChargesParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteCreateSubForCustomerQuoteParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteCreateSubForCustomerQuoteParams.java
deleted file mode 100644
index d4163fcb..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteCreateSubForCustomerQuoteParams.java
+++ /dev/null
@@ -1,831 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class QuoteCreateSubForCustomerQuoteParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteCreateSubForCustomerQuoteParams(QuoteCreateSubForCustomerQuoteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteCreateSubForCustomerQuoteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteCreateSubForCustomerQuoteBuilder builder() {
-    return new QuoteCreateSubForCustomerQuoteBuilder();
-  }
-
-  public static final class QuoteCreateSubForCustomerQuoteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteCreateSubForCustomerQuoteBuilder() {}
-
-    public QuoteCreateSubForCustomerQuoteBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteBuilder notes(String value) {
-
-      formData.put("notes", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteBuilder expiresAt(Timestamp value) {
-
-      formData.put("expires_at", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteBuilder mandatoryAddonsToRemove(List<String> value) {
-
-      formData.put("mandatory_addons_to_remove", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteBuilder eventBasedAddons(
-        List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteParams build() {
-      return new QuoteCreateSubForCustomerQuoteParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder poNumber(String value) {
-
-        formData.put("po_number", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planId(String value) {
-
-        formData.put("plan_id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantity(Integer value) {
-
-        formData.put("plan_quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantityInDecimal(String value) {
-
-        formData.put("plan_quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPrice(Long value) {
-
-        formData.put("plan_unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
-
-        formData.put("plan_unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AddonsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
-
-        formData.put("charge_on", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOn {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOn enumValue : ChargeOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteCreateSubItemsForCustomerQuoteParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteCreateSubItemsForCustomerQuoteParams.java
deleted file mode 100644
index 875024e6..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteCreateSubItemsForCustomerQuoteParams.java
+++ /dev/null
@@ -1,1452 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class QuoteCreateSubItemsForCustomerQuoteParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteCreateSubItemsForCustomerQuoteParams(
-      QuoteCreateSubItemsForCustomerQuoteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteCreateSubItemsForCustomerQuoteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteCreateSubItemsForCustomerQuoteBuilder builder() {
-    return new QuoteCreateSubItemsForCustomerQuoteBuilder();
-  }
-
-  public static final class QuoteCreateSubItemsForCustomerQuoteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteCreateSubItemsForCustomerQuoteBuilder() {}
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder notes(String value) {
-
-      formData.put("notes", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder expiresAt(Timestamp value) {
-
-      formData.put("expires_at", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder mandatoryItemsToRemove(List<String> value) {
-
-      formData.put("mandatory_items_to_remove", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder billingAlignmentMode(
-        BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder billingStartOption(BillingStartOption value) {
-
-      formData.put("billing_start_option", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder netTermDays(Integer value) {
-
-      formData.put("net_term_days", value);
-
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteBuilder coupons(List<CouponsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public QuoteCreateSubItemsForCustomerQuoteBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public QuoteCreateSubItemsForCustomerQuoteBuilder customFields(
-        Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteParams build() {
-      return new QuoteCreateSubItemsForCustomerQuoteParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum BillingStartOption {
-    IMMEDIATELY("immediately"),
-
-    ON_SPECIFIC_DATE("on_specific_date"),
-
-    /** An enum member indicating that BillingStartOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingStartOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingStartOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingStartOption enumValue : BillingStartOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder poNumber(String value) {
-
-        formData.put("po_number", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder rampTierId(String value) {
-
-        formData.put("ramp_tier_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder rampTierId(String value) {
-
-        formData.put("ramp_tier_id", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsParams(CouponsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsBuilder builder() {
-      return new CouponsBuilder();
-    }
-
-    public static final class CouponsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsBuilder() {}
-
-      public CouponsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CouponsBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public CouponsBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public CouponsParams build() {
-        return new CouponsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteDeleteParams.java
deleted file mode 100644
index f7285d28..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteDeleteParams.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class QuoteDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteDeleteParams(QuoteDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteDeleteBuilder builder() {
-    return new QuoteDeleteBuilder();
-  }
-
-  public static final class QuoteDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteDeleteBuilder() {}
-
-    public QuoteDeleteBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public QuoteDeleteParams build() {
-      return new QuoteDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditCreateSubCustomerQuoteForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditCreateSubCustomerQuoteForItemsParams.java
deleted file mode 100644
index 2e2025a6..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditCreateSubCustomerQuoteForItemsParams.java
+++ /dev/null
@@ -1,1450 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class QuoteEditCreateSubCustomerQuoteForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteEditCreateSubCustomerQuoteForItemsParams(
-      QuoteEditCreateSubCustomerQuoteForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteEditCreateSubCustomerQuoteForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteEditCreateSubCustomerQuoteForItemsBuilder builder() {
-    return new QuoteEditCreateSubCustomerQuoteForItemsBuilder();
-  }
-
-  public static final class QuoteEditCreateSubCustomerQuoteForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteEditCreateSubCustomerQuoteForItemsBuilder() {}
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder notes(String value) {
-
-      formData.put("notes", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder expiresAt(Timestamp value) {
-
-      formData.put("expires_at", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder mandatoryItemsToRemove(
-        List<String> value) {
-
-      formData.put("mandatory_items_to_remove", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder billingAlignmentMode(
-        BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder billingStartOption(
-        BillingStartOption value) {
-
-      formData.put("billing_start_option", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder netTermDays(Integer value) {
-
-      formData.put("net_term_days", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder shippingAddress(
-        ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder billingAddress(
-        BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder coupons(List<CouponsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder customField(
-        String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public QuoteEditCreateSubCustomerQuoteForItemsBuilder customFields(
-        Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsParams build() {
-      return new QuoteEditCreateSubCustomerQuoteForItemsParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum BillingStartOption {
-    IMMEDIATELY("immediately"),
-
-    ON_SPECIFIC_DATE("on_specific_date"),
-
-    /** An enum member indicating that BillingStartOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingStartOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingStartOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingStartOption enumValue : BillingStartOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder poNumber(String value) {
-
-        formData.put("po_number", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder rampTierId(String value) {
-
-        formData.put("ramp_tier_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder rampTierId(String value) {
-
-        formData.put("ramp_tier_id", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsParams(CouponsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsBuilder builder() {
-      return new CouponsBuilder();
-    }
-
-    public static final class CouponsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsBuilder() {}
-
-      public CouponsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CouponsBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public CouponsBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public CouponsParams build() {
-        return new CouponsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditCreateSubForCustomerQuoteParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditCreateSubForCustomerQuoteParams.java
deleted file mode 100644
index 73f17430..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditCreateSubForCustomerQuoteParams.java
+++ /dev/null
@@ -1,826 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class QuoteEditCreateSubForCustomerQuoteParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteEditCreateSubForCustomerQuoteParams(
-      QuoteEditCreateSubForCustomerQuoteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteEditCreateSubForCustomerQuoteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteEditCreateSubForCustomerQuoteBuilder builder() {
-    return new QuoteEditCreateSubForCustomerQuoteBuilder();
-  }
-
-  public static final class QuoteEditCreateSubForCustomerQuoteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteEditCreateSubForCustomerQuoteBuilder() {}
-
-    public QuoteEditCreateSubForCustomerQuoteBuilder notes(String value) {
-
-      formData.put("notes", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubForCustomerQuoteBuilder expiresAt(Timestamp value) {
-
-      formData.put("expires_at", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubForCustomerQuoteBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubForCustomerQuoteBuilder mandatoryAddonsToRemove(List<String> value) {
-
-      formData.put("mandatory_addons_to_remove", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubForCustomerQuoteBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubForCustomerQuoteBuilder billingAlignmentMode(
-        BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubForCustomerQuoteBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public QuoteEditCreateSubForCustomerQuoteBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditCreateSubForCustomerQuoteBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditCreateSubForCustomerQuoteBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditCreateSubForCustomerQuoteBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditCreateSubForCustomerQuoteBuilder eventBasedAddons(
-        List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditCreateSubForCustomerQuoteParams build() {
-      return new QuoteEditCreateSubForCustomerQuoteParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder poNumber(String value) {
-
-        formData.put("po_number", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planId(String value) {
-
-        formData.put("plan_id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantity(Integer value) {
-
-        formData.put("plan_quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantityInDecimal(String value) {
-
-        formData.put("plan_quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPrice(Long value) {
-
-        formData.put("plan_unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
-
-        formData.put("plan_unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AddonsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
-
-        formData.put("charge_on", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOn {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOn enumValue : ChargeOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditForChargeItemsAndChargesParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditForChargeItemsAndChargesParams.java
deleted file mode 100644
index f1e43f3b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditForChargeItemsAndChargesParams.java
+++ /dev/null
@@ -1,961 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class QuoteEditForChargeItemsAndChargesParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteEditForChargeItemsAndChargesParams(
-      QuoteEditForChargeItemsAndChargesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteEditForChargeItemsAndChargesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteEditForChargeItemsAndChargesBuilder builder() {
-    return new QuoteEditForChargeItemsAndChargesBuilder();
-  }
-
-  public static final class QuoteEditForChargeItemsAndChargesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteEditForChargeItemsAndChargesBuilder() {}
-
-    public QuoteEditForChargeItemsAndChargesBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public QuoteEditForChargeItemsAndChargesBuilder notes(String value) {
-
-      formData.put("notes", value);
-
-      return this;
-    }
-
-    public QuoteEditForChargeItemsAndChargesBuilder expiresAt(Timestamp value) {
-
-      formData.put("expires_at", value);
-
-      return this;
-    }
-
-    public QuoteEditForChargeItemsAndChargesBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public QuoteEditForChargeItemsAndChargesBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public QuoteEditForChargeItemsAndChargesBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public QuoteEditForChargeItemsAndChargesBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditForChargeItemsAndChargesBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditForChargeItemsAndChargesBuilder itemPrices(List<ItemPricesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemPricesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_prices[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditForChargeItemsAndChargesBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditForChargeItemsAndChargesBuilder charges(List<ChargesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditForChargeItemsAndChargesBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditForChargeItemsAndChargesBuilder taxProvidersFields(
-        List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditForChargeItemsAndChargesParams build() {
-      return new QuoteEditForChargeItemsAndChargesParams(this);
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemPricesParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemPricesParams(ItemPricesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemPricesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemPricesBuilder builder() {
-      return new ItemPricesBuilder();
-    }
-
-    public static final class ItemPricesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemPricesBuilder() {}
-
-      public ItemPricesBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public ItemPricesParams build() {
-        return new ItemPricesParams(this);
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChargesParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargesParams(ChargesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargesBuilder builder() {
-      return new ChargesBuilder();
-    }
-
-    public static final class ChargesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargesBuilder() {}
-
-      public ChargesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public ChargesBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public ChargesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder servicePeriod(Integer value) {
-
-        formData.put("service_period", value);
-
-        return this;
-      }
-
-      public ChargesParams build() {
-        return new ChargesParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditOneTimeQuoteParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditOneTimeQuoteParams.java
deleted file mode 100644
index 2b5b271b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditOneTimeQuoteParams.java
+++ /dev/null
@@ -1,540 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class QuoteEditOneTimeQuoteParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteEditOneTimeQuoteParams(QuoteEditOneTimeQuoteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteEditOneTimeQuoteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteEditOneTimeQuoteBuilder builder() {
-    return new QuoteEditOneTimeQuoteBuilder();
-  }
-
-  public static final class QuoteEditOneTimeQuoteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteEditOneTimeQuoteBuilder() {}
-
-    public QuoteEditOneTimeQuoteBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public QuoteEditOneTimeQuoteBuilder notes(String value) {
-
-      formData.put("notes", value);
-
-      return this;
-    }
-
-    public QuoteEditOneTimeQuoteBuilder expiresAt(Timestamp value) {
-
-      formData.put("expires_at", value);
-
-      return this;
-    }
-
-    public QuoteEditOneTimeQuoteBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public QuoteEditOneTimeQuoteBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public QuoteEditOneTimeQuoteBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public QuoteEditOneTimeQuoteBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditOneTimeQuoteBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditOneTimeQuoteBuilder charges(List<ChargesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditOneTimeQuoteBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditOneTimeQuoteParams build() {
-      return new QuoteEditOneTimeQuoteParams(this);
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder servicePeriod(Integer value) {
-
-        formData.put("service_period", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class ChargesParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargesParams(ChargesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargesBuilder builder() {
-      return new ChargesBuilder();
-    }
-
-    public static final class ChargesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargesBuilder() {}
-
-      public ChargesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public ChargesBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public ChargesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder servicePeriod(Integer value) {
-
-        formData.put("service_period", value);
-
-        return this;
-      }
-
-      public ChargesParams build() {
-        return new ChargesParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditUpdateSubscriptionQuoteForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditUpdateSubscriptionQuoteForItemsParams.java
deleted file mode 100644
index d8369d82..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditUpdateSubscriptionQuoteForItemsParams.java
+++ /dev/null
@@ -1,1626 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class QuoteEditUpdateSubscriptionQuoteForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteEditUpdateSubscriptionQuoteForItemsParams(
-      QuoteEditUpdateSubscriptionQuoteForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteEditUpdateSubscriptionQuoteForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteEditUpdateSubscriptionQuoteForItemsBuilder builder() {
-    return new QuoteEditUpdateSubscriptionQuoteForItemsBuilder();
-  }
-
-  public static final class QuoteEditUpdateSubscriptionQuoteForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteEditUpdateSubscriptionQuoteForItemsBuilder() {}
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder notes(String value) {
-
-      formData.put("notes", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder expiresAt(Timestamp value) {
-
-      formData.put("expires_at", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder mandatoryItemsToRemove(
-        List<String> value) {
-
-      formData.put("mandatory_items_to_remove", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder replaceItemsList(Boolean value) {
-
-      formData.put("replace_items_list", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder reactivateFrom(Timestamp value) {
-
-      formData.put("reactivate_from", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder billingAlignmentMode(
-        BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder replaceCouponList(Boolean value) {
-
-      formData.put("replace_coupon_list", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder changeOption(ChangeOption value) {
-
-      formData.put("change_option", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder changesScheduledAt(Timestamp value) {
-
-      formData.put("changes_scheduled_at", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder forceTermReset(Boolean value) {
-
-      formData.put("force_term_reset", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder reactivate(Boolean value) {
-
-      formData.put("reactivate", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder netTermDays(Integer value) {
-
-      formData.put("net_term_days", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder billingAddress(
-        BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder shippingAddress(
-        ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder coupons(List<CouponsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder customField(
-        String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public QuoteEditUpdateSubscriptionQuoteForItemsBuilder customFields(
-        Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsParams build() {
-      return new QuoteEditUpdateSubscriptionQuoteForItemsParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChangeOption {
-    IMMEDIATELY("immediately"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChangeOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChangeOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChangeOption enumValue : ChangeOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      @Deprecated
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder coupon(String value) {
-
-        formData.put("coupon", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder autoCollection(AutoCollection value) {
-
-        formData.put("auto_collection", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum AutoCollection {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AutoCollection(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AutoCollection fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AutoCollection enumValue : AutoCollection.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder registeredForGst(Boolean value) {
-
-        formData.put("registered_for_gst", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder rampTierId(String value) {
-
-        formData.put("ramp_tier_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder operationType(OperationType value) {
-
-        formData.put("operation_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OperationType {
-      ADD("add"),
-
-      REMOVE("remove"),
-
-      /** An enum member indicating that OperationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OperationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OperationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OperationType enumValue : OperationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder rampTierId(String value) {
-
-        formData.put("ramp_tier_id", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsParams(CouponsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsBuilder builder() {
-      return new CouponsBuilder();
-    }
-
-    public static final class CouponsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsBuilder() {}
-
-      public CouponsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CouponsBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public CouponsBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public CouponsParams build() {
-        return new CouponsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditUpdateSubscriptionQuoteParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditUpdateSubscriptionQuoteParams.java
deleted file mode 100644
index 6b9dd702..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteEditUpdateSubscriptionQuoteParams.java
+++ /dev/null
@@ -1,1166 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class QuoteEditUpdateSubscriptionQuoteParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteEditUpdateSubscriptionQuoteParams(QuoteEditUpdateSubscriptionQuoteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteEditUpdateSubscriptionQuoteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteEditUpdateSubscriptionQuoteBuilder builder() {
-    return new QuoteEditUpdateSubscriptionQuoteBuilder();
-  }
-
-  public static final class QuoteEditUpdateSubscriptionQuoteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteEditUpdateSubscriptionQuoteBuilder() {}
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder notes(String value) {
-
-      formData.put("notes", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder expiresAt(Timestamp value) {
-
-      formData.put("expires_at", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder replaceAddonList(Boolean value) {
-
-      formData.put("replace_addon_list", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder mandatoryAddonsToRemove(List<String> value) {
-
-      formData.put("mandatory_addons_to_remove", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder reactivateFrom(Timestamp value) {
-
-      formData.put("reactivate_from", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder billingAlignmentMode(
-        BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder replaceCouponList(Boolean value) {
-
-      formData.put("replace_coupon_list", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder changeOption(ChangeOption value) {
-
-      formData.put("change_option", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder changesScheduledAt(Timestamp value) {
-
-      formData.put("changes_scheduled_at", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder forceTermReset(Boolean value) {
-
-      formData.put("force_term_reset", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder reactivate(Boolean value) {
-
-      formData.put("reactivate", value);
-
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteBuilder eventBasedAddons(
-        List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteParams build() {
-      return new QuoteEditUpdateSubscriptionQuoteParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChangeOption {
-    IMMEDIATELY("immediately"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChangeOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChangeOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChangeOption enumValue : ChangeOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder planId(String value) {
-
-        formData.put("plan_id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantity(Integer value) {
-
-        formData.put("plan_quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPrice(Long value) {
-
-        formData.put("plan_unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantityInDecimal(String value) {
-
-        formData.put("plan_quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
-
-        formData.put("plan_unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder coupon(String value) {
-
-        formData.put("coupon", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder autoCollection(AutoCollection value) {
-
-        formData.put("auto_collection", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum AutoCollection {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AutoCollection(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AutoCollection fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AutoCollection enumValue : AutoCollection.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder registeredForGst(Boolean value) {
-
-        formData.put("registered_for_gst", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
-
-        formData.put("charge_on", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum ChargeOn {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOn enumValue : ChargeOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteExtendExpiryDateParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteExtendExpiryDateParams.java
deleted file mode 100644
index 60dabf1d..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteExtendExpiryDateParams.java
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class QuoteExtendExpiryDateParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteExtendExpiryDateParams(QuoteExtendExpiryDateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteExtendExpiryDateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteExtendExpiryDateBuilder builder() {
-    return new QuoteExtendExpiryDateBuilder();
-  }
-
-  public static final class QuoteExtendExpiryDateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteExtendExpiryDateBuilder() {}
-
-    public QuoteExtendExpiryDateBuilder validTill(Timestamp value) {
-
-      formData.put("valid_till", value);
-
-      return this;
-    }
-
-    public QuoteExtendExpiryDateParams build() {
-      return new QuoteExtendExpiryDateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuotePdfParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuotePdfParams.java
deleted file mode 100644
index 4a3d778f..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuotePdfParams.java
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class QuotePdfParams {
-
-  private final Map<String, Object> formData;
-
-  private QuotePdfParams(QuotePdfBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuotePdfParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuotePdfBuilder builder() {
-    return new QuotePdfBuilder();
-  }
-
-  public static final class QuotePdfBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuotePdfBuilder() {}
-
-    public QuotePdfBuilder consolidatedView(Boolean value) {
-
-      formData.put("consolidated_view", value);
-
-      return this;
-    }
-
-    public QuotePdfBuilder dispositionType(DispositionType value) {
-
-      formData.put("disposition_type", value);
-
-      return this;
-    }
-
-    public QuotePdfParams build() {
-      return new QuotePdfParams(this);
-    }
-  }
-
-  public enum DispositionType {
-    ATTACHMENT("attachment"),
-
-    INLINE("inline"),
-
-    /** An enum member indicating that DispositionType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    DispositionType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static DispositionType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (DispositionType enumValue : DispositionType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteQuoteLineGroupsForQuoteParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteQuoteLineGroupsForQuoteParams.java
deleted file mode 100644
index 5e9ba0cc..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteQuoteLineGroupsForQuoteParams.java
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class QuoteQuoteLineGroupsForQuoteParams {
-
-  private final Map<String, Object> queryParams;
-
-  private QuoteQuoteLineGroupsForQuoteParams(QuoteQuoteLineGroupsForQuoteBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public QuoteQuoteLineGroupsForQuoteBuilder toBuilder() {
-    QuoteQuoteLineGroupsForQuoteBuilder builder = new QuoteQuoteLineGroupsForQuoteBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for QuoteQuoteLineGroupsForQuoteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteQuoteLineGroupsForQuoteBuilder builder() {
-    return new QuoteQuoteLineGroupsForQuoteBuilder();
-  }
-
-  public static final class QuoteQuoteLineGroupsForQuoteBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private QuoteQuoteLineGroupsForQuoteBuilder() {}
-
-    public QuoteQuoteLineGroupsForQuoteBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public QuoteQuoteLineGroupsForQuoteBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public QuoteQuoteLineGroupsForQuoteParams build() {
-      return new QuoteQuoteLineGroupsForQuoteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteUpdateSubscriptionQuoteForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteUpdateSubscriptionQuoteForItemsParams.java
deleted file mode 100644
index 424db7ed..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteUpdateSubscriptionQuoteForItemsParams.java
+++ /dev/null
@@ -1,1637 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class QuoteUpdateSubscriptionQuoteForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteUpdateSubscriptionQuoteForItemsParams(
-      QuoteUpdateSubscriptionQuoteForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteUpdateSubscriptionQuoteForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteUpdateSubscriptionQuoteForItemsBuilder builder() {
-    return new QuoteUpdateSubscriptionQuoteForItemsBuilder();
-  }
-
-  public static final class QuoteUpdateSubscriptionQuoteForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteUpdateSubscriptionQuoteForItemsBuilder() {}
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder notes(String value) {
-
-      formData.put("notes", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder expiresAt(Timestamp value) {
-
-      formData.put("expires_at", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder mandatoryItemsToRemove(List<String> value) {
-
-      formData.put("mandatory_items_to_remove", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder replaceItemsList(Boolean value) {
-
-      formData.put("replace_items_list", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder reactivateFrom(Timestamp value) {
-
-      formData.put("reactivate_from", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder billingAlignmentMode(
-        BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder replaceCouponList(Boolean value) {
-
-      formData.put("replace_coupon_list", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder changeOption(ChangeOption value) {
-
-      formData.put("change_option", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder changesScheduledAt(Timestamp value) {
-
-      formData.put("changes_scheduled_at", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder forceTermReset(Boolean value) {
-
-      formData.put("force_term_reset", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder reactivate(Boolean value) {
-
-      formData.put("reactivate", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder netTermDays(Integer value) {
-
-      formData.put("net_term_days", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder shippingAddress(
-        ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder coupons(List<CouponsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public QuoteUpdateSubscriptionQuoteForItemsBuilder customFields(
-        Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsParams build() {
-      return new QuoteUpdateSubscriptionQuoteForItemsParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChangeOption {
-    IMMEDIATELY("immediately"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChangeOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChangeOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChangeOption enumValue : ChangeOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder coupon(String value) {
-
-        formData.put("coupon", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder autoCollection(AutoCollection value) {
-
-        formData.put("auto_collection", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum AutoCollection {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AutoCollection(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AutoCollection fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AutoCollection enumValue : AutoCollection.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder registeredForGst(Boolean value) {
-
-        formData.put("registered_for_gst", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder rampTierId(String value) {
-
-        formData.put("ramp_tier_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder operationType(OperationType value) {
-
-        formData.put("operation_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OperationType {
-      ADD("add"),
-
-      REMOVE("remove"),
-
-      /** An enum member indicating that OperationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OperationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OperationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OperationType enumValue : OperationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder rampTierId(String value) {
-
-        formData.put("ramp_tier_id", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsParams(CouponsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsBuilder builder() {
-      return new CouponsBuilder();
-    }
-
-    public static final class CouponsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsBuilder() {}
-
-      public CouponsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CouponsBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public CouponsBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public CouponsParams build() {
-        return new CouponsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteUpdateSubscriptionQuoteParams.java b/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteUpdateSubscriptionQuoteParams.java
deleted file mode 100644
index df2a134e..00000000
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteUpdateSubscriptionQuoteParams.java
+++ /dev/null
@@ -1,1179 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.quote.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class QuoteUpdateSubscriptionQuoteParams {
-
-  private final Map<String, Object> formData;
-
-  private QuoteUpdateSubscriptionQuoteParams(QuoteUpdateSubscriptionQuoteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for QuoteUpdateSubscriptionQuoteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static QuoteUpdateSubscriptionQuoteBuilder builder() {
-    return new QuoteUpdateSubscriptionQuoteBuilder();
-  }
-
-  public static final class QuoteUpdateSubscriptionQuoteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private QuoteUpdateSubscriptionQuoteBuilder() {}
-
-    public QuoteUpdateSubscriptionQuoteBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder notes(String value) {
-
-      formData.put("notes", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder expiresAt(Timestamp value) {
-
-      formData.put("expires_at", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder replaceAddonList(Boolean value) {
-
-      formData.put("replace_addon_list", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder mandatoryAddonsToRemove(List<String> value) {
-
-      formData.put("mandatory_addons_to_remove", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder reactivateFrom(Timestamp value) {
-
-      formData.put("reactivate_from", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder replaceCouponList(Boolean value) {
-
-      formData.put("replace_coupon_list", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder changeOption(ChangeOption value) {
-
-      formData.put("change_option", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder changesScheduledAt(Timestamp value) {
-
-      formData.put("changes_scheduled_at", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder forceTermReset(Boolean value) {
-
-      formData.put("force_term_reset", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder reactivate(Boolean value) {
-
-      formData.put("reactivate", value);
-
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder subscription(SubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteBuilder eventBasedAddons(
-        List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteParams build() {
-      return new QuoteUpdateSubscriptionQuoteParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChangeOption {
-    IMMEDIATELY("immediately"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChangeOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChangeOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChangeOption enumValue : ChangeOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionParams(SubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionBuilder builder() {
-      return new SubscriptionBuilder();
-    }
-
-    public static final class SubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionBuilder() {}
-
-      public SubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planId(String value) {
-
-        formData.put("plan_id", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantity(Integer value) {
-
-        formData.put("plan_quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPrice(Long value) {
-
-        formData.put("plan_unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder setupFee(Long value) {
-
-        formData.put("setup_fee", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planQuantityInDecimal(String value) {
-
-        formData.put("plan_quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
-
-        formData.put("plan_unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder startDate(Timestamp value) {
-
-        formData.put("start_date", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public SubscriptionBuilder coupon(String value) {
-
-        formData.put("coupon", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder autoCollection(AutoCollection value) {
-
-        formData.put("auto_collection", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-        formData.put("contract_term_billing_cycle_on_renewal", value);
-
-        return this;
-      }
-
-      public SubscriptionParams build() {
-        return new SubscriptionParams(this);
-      }
-    }
-
-    public enum AutoCollection {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AutoCollection(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AutoCollection fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AutoCollection enumValue : AutoCollection.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder registeredForGst(Boolean value) {
-
-        formData.put("registered_for_gst", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
-
-        formData.put("charge_on", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum ChargeOn {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOn enumValue : ChargeOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/ramp/params/RampCreateForSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/ramp/params/RampCreateForSubscriptionParams.java
deleted file mode 100644
index 71644a9d..00000000
--- a/src/main/java/com/chargebee/v4/core/models/ramp/params/RampCreateForSubscriptionParams.java
+++ /dev/null
@@ -1,917 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.ramp.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class RampCreateForSubscriptionParams {
-
-  private final Map<String, Object> formData;
-
-  private RampCreateForSubscriptionParams(RampCreateForSubscriptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for RampCreateForSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static RampCreateForSubscriptionBuilder builder() {
-    return new RampCreateForSubscriptionBuilder();
-  }
-
-  public static final class RampCreateForSubscriptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private RampCreateForSubscriptionBuilder() {}
-
-    public RampCreateForSubscriptionBuilder effectiveFrom(Timestamp value) {
-
-      formData.put("effective_from", value);
-
-      return this;
-    }
-
-    public RampCreateForSubscriptionBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public RampCreateForSubscriptionBuilder couponsToRemove(List<String> value) {
-
-      formData.put("coupons_to_remove", value);
-
-      return this;
-    }
-
-    public RampCreateForSubscriptionBuilder discountsToRemove(List<String> value) {
-
-      formData.put("discounts_to_remove", value);
-
-      return this;
-    }
-
-    public RampCreateForSubscriptionBuilder itemsToRemove(List<String> value) {
-
-      formData.put("items_to_remove", value);
-
-      return this;
-    }
-
-    public RampCreateForSubscriptionBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public RampCreateForSubscriptionBuilder itemsToAdd(List<ItemsToAddParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemsToAddParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "items_to_add[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public RampCreateForSubscriptionBuilder itemsToUpdate(List<ItemsToUpdateParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemsToUpdateParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "items_to_update[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public RampCreateForSubscriptionBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public RampCreateForSubscriptionBuilder couponsToAdd(List<CouponsToAddParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsToAddParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons_to_add[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public RampCreateForSubscriptionBuilder discountsToAdd(List<DiscountsToAddParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsToAddParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts_to_add[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public RampCreateForSubscriptionParams build() {
-      return new RampCreateForSubscriptionParams(this);
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder renewalBillingCycles(Integer value) {
-
-        formData.put("renewal_billing_cycles", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemsToAddParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemsToAddParams(ItemsToAddBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemsToAddParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemsToAddBuilder builder() {
-      return new ItemsToAddBuilder();
-    }
-
-    public static final class ItemsToAddBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemsToAddBuilder() {}
-
-      public ItemsToAddBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public ItemsToAddParams build() {
-        return new ItemsToAddParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemsToUpdateParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemsToUpdateParams(ItemsToUpdateBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemsToUpdateParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemsToUpdateBuilder builder() {
-      return new ItemsToUpdateBuilder();
-    }
-
-    public static final class ItemsToUpdateBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemsToUpdateBuilder() {}
-
-      public ItemsToUpdateBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateParams build() {
-        return new ItemsToUpdateParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponsToAddParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsToAddParams(CouponsToAddBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsToAddParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsToAddBuilder builder() {
-      return new CouponsToAddBuilder();
-    }
-
-    public static final class CouponsToAddBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsToAddBuilder() {}
-
-      public CouponsToAddBuilder couponId(String value) {
-
-        formData.put("coupon_id", value);
-
-        return this;
-      }
-
-      public CouponsToAddBuilder applyTill(Timestamp value) {
-
-        formData.put("apply_till", value);
-
-        return this;
-      }
-
-      public CouponsToAddParams build() {
-        return new CouponsToAddParams(this);
-      }
-    }
-  }
-
-  public static final class DiscountsToAddParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsToAddParams(DiscountsToAddBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsToAddParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsToAddBuilder builder() {
-      return new DiscountsToAddBuilder();
-    }
-
-    public static final class DiscountsToAddBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsToAddBuilder() {}
-
-      public DiscountsToAddBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsToAddParams build() {
-        return new DiscountsToAddParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/ramp/params/RampDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/ramp/params/RampDeleteParams.java
deleted file mode 100644
index c4f6c757..00000000
--- a/src/main/java/com/chargebee/v4/core/models/ramp/params/RampDeleteParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.ramp.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class RampDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private RampDeleteParams(RampDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for RampDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static RampDeleteBuilder builder() {
-    return new RampDeleteBuilder();
-  }
-
-  public static final class RampDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private RampDeleteBuilder() {}
-
-    public RampDeleteParams build() {
-      return new RampDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/ramp/params/RampUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/ramp/params/RampUpdateParams.java
deleted file mode 100644
index 0cff6dd8..00000000
--- a/src/main/java/com/chargebee/v4/core/models/ramp/params/RampUpdateParams.java
+++ /dev/null
@@ -1,917 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.ramp.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class RampUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private RampUpdateParams(RampUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for RampUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static RampUpdateBuilder builder() {
-    return new RampUpdateBuilder();
-  }
-
-  public static final class RampUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private RampUpdateBuilder() {}
-
-    public RampUpdateBuilder effectiveFrom(Timestamp value) {
-
-      formData.put("effective_from", value);
-
-      return this;
-    }
-
-    public RampUpdateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public RampUpdateBuilder couponsToRemove(List<String> value) {
-
-      formData.put("coupons_to_remove", value);
-
-      return this;
-    }
-
-    public RampUpdateBuilder discountsToRemove(List<String> value) {
-
-      formData.put("discounts_to_remove", value);
-
-      return this;
-    }
-
-    public RampUpdateBuilder itemsToRemove(List<String> value) {
-
-      formData.put("items_to_remove", value);
-
-      return this;
-    }
-
-    public RampUpdateBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public RampUpdateBuilder itemsToAdd(List<ItemsToAddParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemsToAddParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "items_to_add[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public RampUpdateBuilder itemsToUpdate(List<ItemsToUpdateParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemsToUpdateParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "items_to_update[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public RampUpdateBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public RampUpdateBuilder couponsToAdd(List<CouponsToAddParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsToAddParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons_to_add[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public RampUpdateBuilder discountsToAdd(List<DiscountsToAddParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsToAddParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts_to_add[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public RampUpdateParams build() {
-      return new RampUpdateParams(this);
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder renewalBillingCycles(Integer value) {
-
-        formData.put("renewal_billing_cycles", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemsToAddParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemsToAddParams(ItemsToAddBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemsToAddParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemsToAddBuilder builder() {
-      return new ItemsToAddBuilder();
-    }
-
-    public static final class ItemsToAddBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemsToAddBuilder() {}
-
-      public ItemsToAddBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public ItemsToAddBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public ItemsToAddParams build() {
-        return new ItemsToAddParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemsToUpdateParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemsToUpdateParams(ItemsToUpdateBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemsToUpdateParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemsToUpdateBuilder builder() {
-      return new ItemsToUpdateBuilder();
-    }
-
-    public static final class ItemsToUpdateBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemsToUpdateBuilder() {}
-
-      public ItemsToUpdateBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public ItemsToUpdateParams build() {
-        return new ItemsToUpdateParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponsToAddParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsToAddParams(CouponsToAddBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsToAddParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsToAddBuilder builder() {
-      return new CouponsToAddBuilder();
-    }
-
-    public static final class CouponsToAddBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsToAddBuilder() {}
-
-      public CouponsToAddBuilder couponId(String value) {
-
-        formData.put("coupon_id", value);
-
-        return this;
-      }
-
-      public CouponsToAddBuilder applyTill(Timestamp value) {
-
-        formData.put("apply_till", value);
-
-        return this;
-      }
-
-      public CouponsToAddParams build() {
-        return new CouponsToAddParams(this);
-      }
-    }
-  }
-
-  public static final class DiscountsToAddParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsToAddParams(DiscountsToAddBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsToAddParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsToAddBuilder builder() {
-      return new DiscountsToAddBuilder();
-    }
-
-    public static final class DiscountsToAddBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsToAddBuilder() {}
-
-      public DiscountsToAddBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsToAddBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsToAddParams build() {
-        return new DiscountsToAddParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/recordedPurchase/params/RecordedPurchaseCreateParams.java b/src/main/java/com/chargebee/v4/core/models/recordedPurchase/params/RecordedPurchaseCreateParams.java
deleted file mode 100644
index 9b70f3c5..00000000
--- a/src/main/java/com/chargebee/v4/core/models/recordedPurchase/params/RecordedPurchaseCreateParams.java
+++ /dev/null
@@ -1,271 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.recordedPurchase.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class RecordedPurchaseCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private RecordedPurchaseCreateParams(RecordedPurchaseCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for RecordedPurchaseCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static RecordedPurchaseCreateBuilder builder() {
-    return new RecordedPurchaseCreateBuilder();
-  }
-
-  public static final class RecordedPurchaseCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private RecordedPurchaseCreateBuilder() {}
-
-    public RecordedPurchaseCreateBuilder appId(String value) {
-
-      formData.put("app_id", value);
-
-      return this;
-    }
-
-    public RecordedPurchaseCreateBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public RecordedPurchaseCreateBuilder appleAppStore(AppleAppStoreParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "apple_app_store[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public RecordedPurchaseCreateBuilder googlePlayStore(GooglePlayStoreParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "google_play_store[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public RecordedPurchaseCreateBuilder omnichannelSubscription(
-        OmnichannelSubscriptionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "omnichannel_subscription[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public RecordedPurchaseCreateParams build() {
-      return new RecordedPurchaseCreateParams(this);
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-  }
-
-  public static final class AppleAppStoreParams {
-
-    private final Map<String, Object> formData;
-
-    private AppleAppStoreParams(AppleAppStoreBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AppleAppStoreParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AppleAppStoreBuilder builder() {
-      return new AppleAppStoreBuilder();
-    }
-
-    public static final class AppleAppStoreBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AppleAppStoreBuilder() {}
-
-      public AppleAppStoreBuilder transactionId(String value) {
-
-        formData.put("transaction_id", value);
-
-        return this;
-      }
-
-      public AppleAppStoreBuilder receipt(String value) {
-
-        formData.put("receipt", value);
-
-        return this;
-      }
-
-      public AppleAppStoreBuilder productId(String value) {
-
-        formData.put("product_id", value);
-
-        return this;
-      }
-
-      public AppleAppStoreParams build() {
-        return new AppleAppStoreParams(this);
-      }
-    }
-  }
-
-  public static final class GooglePlayStoreParams {
-
-    private final Map<String, Object> formData;
-
-    private GooglePlayStoreParams(GooglePlayStoreBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for GooglePlayStoreParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static GooglePlayStoreBuilder builder() {
-      return new GooglePlayStoreBuilder();
-    }
-
-    public static final class GooglePlayStoreBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private GooglePlayStoreBuilder() {}
-
-      public GooglePlayStoreBuilder purchaseToken(String value) {
-
-        formData.put("purchase_token", value);
-
-        return this;
-      }
-
-      public GooglePlayStoreBuilder productId(String value) {
-
-        formData.put("product_id", value);
-
-        return this;
-      }
-
-      public GooglePlayStoreBuilder orderId(String value) {
-
-        formData.put("order_id", value);
-
-        return this;
-      }
-
-      public GooglePlayStoreParams build() {
-        return new GooglePlayStoreParams(this);
-      }
-    }
-  }
-
-  public static final class OmnichannelSubscriptionParams {
-
-    private final Map<String, Object> formData;
-
-    private OmnichannelSubscriptionParams(OmnichannelSubscriptionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for OmnichannelSubscriptionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static OmnichannelSubscriptionBuilder builder() {
-      return new OmnichannelSubscriptionBuilder();
-    }
-
-    public static final class OmnichannelSubscriptionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private OmnichannelSubscriptionBuilder() {}
-
-      public OmnichannelSubscriptionBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public OmnichannelSubscriptionParams build() {
-        return new OmnichannelSubscriptionParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionAddChargeAtTermEndParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionAddChargeAtTermEndParams.java
deleted file mode 100644
index ef47bca9..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionAddChargeAtTermEndParams.java
+++ /dev/null
@@ -1,132 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class SubscriptionAddChargeAtTermEndParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionAddChargeAtTermEndParams(SubscriptionAddChargeAtTermEndBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionAddChargeAtTermEndParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionAddChargeAtTermEndBuilder builder() {
-    return new SubscriptionAddChargeAtTermEndBuilder();
-  }
-
-  public static final class SubscriptionAddChargeAtTermEndBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionAddChargeAtTermEndBuilder() {}
-
-    public SubscriptionAddChargeAtTermEndBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public SubscriptionAddChargeAtTermEndBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public SubscriptionAddChargeAtTermEndBuilder amountInDecimal(String value) {
-
-      formData.put("amount_in_decimal", value);
-
-      return this;
-    }
-
-    public SubscriptionAddChargeAtTermEndBuilder avalaraSaleType(AvalaraSaleType value) {
-
-      formData.put("avalara_sale_type", value);
-
-      return this;
-    }
-
-    public SubscriptionAddChargeAtTermEndBuilder avalaraTransactionType(Integer value) {
-
-      formData.put("avalara_transaction_type", value);
-
-      return this;
-    }
-
-    public SubscriptionAddChargeAtTermEndBuilder avalaraServiceType(Integer value) {
-
-      formData.put("avalara_service_type", value);
-
-      return this;
-    }
-
-    public SubscriptionAddChargeAtTermEndBuilder dateFrom(Timestamp value) {
-
-      formData.put("date_from", value);
-
-      return this;
-    }
-
-    public SubscriptionAddChargeAtTermEndBuilder dateTo(Timestamp value) {
-
-      formData.put("date_to", value);
-
-      return this;
-    }
-
-    public SubscriptionAddChargeAtTermEndParams build() {
-      return new SubscriptionAddChargeAtTermEndParams(this);
-    }
-  }
-
-  public enum AvalaraSaleType {
-    WHOLESALE("wholesale"),
-
-    RETAIL("retail"),
-
-    CONSUMED("consumed"),
-
-    VENDOR_USE("vendor_use"),
-
-    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AvalaraSaleType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AvalaraSaleType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCancelForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCancelForItemsParams.java
deleted file mode 100644
index bada6b1e..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCancelForItemsParams.java
+++ /dev/null
@@ -1,403 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class SubscriptionCancelForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionCancelForItemsParams(SubscriptionCancelForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionCancelForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionCancelForItemsBuilder builder() {
-    return new SubscriptionCancelForItemsBuilder();
-  }
-
-  public static final class SubscriptionCancelForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionCancelForItemsBuilder() {}
-
-    public SubscriptionCancelForItemsBuilder cancelOption(CancelOption value) {
-
-      formData.put("cancel_option", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelForItemsBuilder endOfTerm(Boolean value) {
-
-      formData.put("end_of_term", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelForItemsBuilder cancelAt(Timestamp value) {
-
-      formData.put("cancel_at", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelForItemsBuilder creditOptionForCurrentTermCharges(
-        CreditOptionForCurrentTermCharges value) {
-
-      formData.put("credit_option_for_current_term_charges", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelForItemsBuilder unbilledChargesOption(UnbilledChargesOption value) {
-
-      formData.put("unbilled_charges_option", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelForItemsBuilder accountReceivablesHandling(
-        AccountReceivablesHandling value) {
-
-      formData.put("account_receivables_handling", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelForItemsBuilder refundableCreditsHandling(
-        RefundableCreditsHandling value) {
-
-      formData.put("refundable_credits_handling", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelForItemsBuilder contractTermCancelOption(
-        ContractTermCancelOption value) {
-
-      formData.put("contract_term_cancel_option", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelForItemsBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelForItemsBuilder cancelReasonCode(String value) {
-
-      formData.put("cancel_reason_code", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelForItemsBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCancelForItemsParams build() {
-      return new SubscriptionCancelForItemsParams(this);
-    }
-  }
-
-  public enum CancelOption {
-    IMMEDIATELY("immediately"),
-
-    END_OF_TERM("end_of_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    END_OF_BILLING_TERM("end_of_billing_term"),
-
-    /** An enum member indicating that CancelOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CancelOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CancelOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CancelOption enumValue : CancelOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum CreditOptionForCurrentTermCharges {
-    NONE("none"),
-
-    PRORATE("prorate"),
-
-    FULL("full"),
-
-    /**
-     * An enum member indicating that CreditOptionForCurrentTermCharges was instantiated with an
-     * unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    CreditOptionForCurrentTermCharges(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CreditOptionForCurrentTermCharges fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CreditOptionForCurrentTermCharges enumValue :
-          CreditOptionForCurrentTermCharges.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum UnbilledChargesOption {
-    INVOICE("invoice"),
-
-    DELETE("delete"),
-
-    /**
-     * An enum member indicating that UnbilledChargesOption was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    UnbilledChargesOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static UnbilledChargesOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (UnbilledChargesOption enumValue : UnbilledChargesOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AccountReceivablesHandling {
-    NO_ACTION("no_action"),
-
-    SCHEDULE_PAYMENT_COLLECTION("schedule_payment_collection"),
-
-    WRITE_OFF("write_off"),
-
-    /**
-     * An enum member indicating that AccountReceivablesHandling was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    AccountReceivablesHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AccountReceivablesHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AccountReceivablesHandling enumValue : AccountReceivablesHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum RefundableCreditsHandling {
-    NO_ACTION("no_action"),
-
-    SCHEDULE_REFUND("schedule_refund"),
-
-    /**
-     * An enum member indicating that RefundableCreditsHandling was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    RefundableCreditsHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static RefundableCreditsHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (RefundableCreditsHandling enumValue : RefundableCreditsHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ContractTermCancelOption {
-    TERMINATE_IMMEDIATELY("terminate_immediately"),
-
-    END_OF_CONTRACT_TERM("end_of_contract_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    END_OF_SUBSCRIPTION_BILLING_TERM("end_of_subscription_billing_term"),
-
-    /**
-     * An enum member indicating that ContractTermCancelOption was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    ContractTermCancelOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ContractTermCancelOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ContractTermCancelOption enumValue : ContractTermCancelOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCancelParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCancelParams.java
deleted file mode 100644
index 5793d079..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCancelParams.java
+++ /dev/null
@@ -1,385 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class SubscriptionCancelParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionCancelParams(SubscriptionCancelBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionCancelParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionCancelBuilder builder() {
-    return new SubscriptionCancelBuilder();
-  }
-
-  public static final class SubscriptionCancelBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionCancelBuilder() {}
-
-    public SubscriptionCancelBuilder cancelOption(CancelOption value) {
-
-      formData.put("cancel_option", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelBuilder endOfTerm(Boolean value) {
-
-      formData.put("end_of_term", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelBuilder cancelAt(Timestamp value) {
-
-      formData.put("cancel_at", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelBuilder creditOptionForCurrentTermCharges(
-        CreditOptionForCurrentTermCharges value) {
-
-      formData.put("credit_option_for_current_term_charges", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelBuilder unbilledChargesOption(UnbilledChargesOption value) {
-
-      formData.put("unbilled_charges_option", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelBuilder accountReceivablesHandling(AccountReceivablesHandling value) {
-
-      formData.put("account_receivables_handling", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelBuilder refundableCreditsHandling(RefundableCreditsHandling value) {
-
-      formData.put("refundable_credits_handling", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelBuilder contractTermCancelOption(ContractTermCancelOption value) {
-
-      formData.put("contract_term_cancel_option", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelBuilder cancelReasonCode(String value) {
-
-      formData.put("cancel_reason_code", value);
-
-      return this;
-    }
-
-    public SubscriptionCancelBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCancelParams build() {
-      return new SubscriptionCancelParams(this);
-    }
-  }
-
-  public enum CancelOption {
-    IMMEDIATELY("immediately"),
-
-    END_OF_TERM("end_of_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    END_OF_BILLING_TERM("end_of_billing_term"),
-
-    /** An enum member indicating that CancelOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    CancelOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CancelOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CancelOption enumValue : CancelOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum CreditOptionForCurrentTermCharges {
-    NONE("none"),
-
-    PRORATE("prorate"),
-
-    FULL("full"),
-
-    /**
-     * An enum member indicating that CreditOptionForCurrentTermCharges was instantiated with an
-     * unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    CreditOptionForCurrentTermCharges(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static CreditOptionForCurrentTermCharges fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (CreditOptionForCurrentTermCharges enumValue :
-          CreditOptionForCurrentTermCharges.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum UnbilledChargesOption {
-    INVOICE("invoice"),
-
-    DELETE("delete"),
-
-    /**
-     * An enum member indicating that UnbilledChargesOption was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    UnbilledChargesOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static UnbilledChargesOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (UnbilledChargesOption enumValue : UnbilledChargesOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AccountReceivablesHandling {
-    NO_ACTION("no_action"),
-
-    SCHEDULE_PAYMENT_COLLECTION("schedule_payment_collection"),
-
-    WRITE_OFF("write_off"),
-
-    /**
-     * An enum member indicating that AccountReceivablesHandling was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    AccountReceivablesHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AccountReceivablesHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AccountReceivablesHandling enumValue : AccountReceivablesHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum RefundableCreditsHandling {
-    NO_ACTION("no_action"),
-
-    SCHEDULE_REFUND("schedule_refund"),
-
-    /**
-     * An enum member indicating that RefundableCreditsHandling was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    RefundableCreditsHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static RefundableCreditsHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (RefundableCreditsHandling enumValue : RefundableCreditsHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ContractTermCancelOption {
-    TERMINATE_IMMEDIATELY("terminate_immediately"),
-
-    END_OF_CONTRACT_TERM("end_of_contract_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    END_OF_SUBSCRIPTION_BILLING_TERM("end_of_subscription_billing_term"),
-
-    /**
-     * An enum member indicating that ContractTermCancelOption was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    ContractTermCancelOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ContractTermCancelOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ContractTermCancelOption enumValue : ContractTermCancelOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionChangeTermEndParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionChangeTermEndParams.java
deleted file mode 100644
index e0b06428..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionChangeTermEndParams.java
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class SubscriptionChangeTermEndParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionChangeTermEndParams(SubscriptionChangeTermEndBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionChangeTermEndParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionChangeTermEndBuilder builder() {
-    return new SubscriptionChangeTermEndBuilder();
-  }
-
-  public static final class SubscriptionChangeTermEndBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionChangeTermEndBuilder() {}
-
-    public SubscriptionChangeTermEndBuilder termEndsAt(Timestamp value) {
-
-      formData.put("term_ends_at", value);
-
-      return this;
-    }
-
-    public SubscriptionChangeTermEndBuilder prorate(Boolean value) {
-
-      formData.put("prorate", value);
-
-      return this;
-    }
-
-    public SubscriptionChangeTermEndBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public SubscriptionChangeTermEndParams build() {
-      return new SubscriptionChangeTermEndParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionChargeAddonAtTermEndParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionChargeAddonAtTermEndParams.java
deleted file mode 100644
index f95ef9dc..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionChargeAddonAtTermEndParams.java
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class SubscriptionChargeAddonAtTermEndParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionChargeAddonAtTermEndParams(SubscriptionChargeAddonAtTermEndBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionChargeAddonAtTermEndParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionChargeAddonAtTermEndBuilder builder() {
-    return new SubscriptionChargeAddonAtTermEndBuilder();
-  }
-
-  public static final class SubscriptionChargeAddonAtTermEndBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionChargeAddonAtTermEndBuilder() {}
-
-    public SubscriptionChargeAddonAtTermEndBuilder addonId(String value) {
-
-      formData.put("addon_id", value);
-
-      return this;
-    }
-
-    public SubscriptionChargeAddonAtTermEndBuilder addonQuantity(Integer value) {
-
-      formData.put("addon_quantity", value);
-
-      return this;
-    }
-
-    public SubscriptionChargeAddonAtTermEndBuilder addonUnitPrice(Long value) {
-
-      formData.put("addon_unit_price", value);
-
-      return this;
-    }
-
-    public SubscriptionChargeAddonAtTermEndBuilder addonQuantityInDecimal(String value) {
-
-      formData.put("addon_quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public SubscriptionChargeAddonAtTermEndBuilder addonUnitPriceInDecimal(String value) {
-
-      formData.put("addon_unit_price_in_decimal", value);
-
-      return this;
-    }
-
-    public SubscriptionChargeAddonAtTermEndBuilder dateFrom(Timestamp value) {
-
-      formData.put("date_from", value);
-
-      return this;
-    }
-
-    public SubscriptionChargeAddonAtTermEndBuilder dateTo(Timestamp value) {
-
-      formData.put("date_to", value);
-
-      return this;
-    }
-
-    public SubscriptionChargeAddonAtTermEndParams build() {
-      return new SubscriptionChargeAddonAtTermEndParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionChargeFutureRenewalsParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionChargeFutureRenewalsParams.java
deleted file mode 100644
index 83a70f75..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionChargeFutureRenewalsParams.java
+++ /dev/null
@@ -1,257 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class SubscriptionChargeFutureRenewalsParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionChargeFutureRenewalsParams(SubscriptionChargeFutureRenewalsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionChargeFutureRenewalsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionChargeFutureRenewalsBuilder builder() {
-    return new SubscriptionChargeFutureRenewalsBuilder();
-  }
-
-  public static final class SubscriptionChargeFutureRenewalsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionChargeFutureRenewalsBuilder() {}
-
-    public SubscriptionChargeFutureRenewalsBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public SubscriptionChargeFutureRenewalsBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public SubscriptionChargeFutureRenewalsBuilder scheduleType(ScheduleType value) {
-
-      formData.put("schedule_type", value);
-
-      return this;
-    }
-
-    public SubscriptionChargeFutureRenewalsBuilder fixedIntervalSchedule(
-        FixedIntervalScheduleParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "fixed_interval_schedule[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionChargeFutureRenewalsBuilder specificDatesSchedule(
-        List<SpecificDatesScheduleParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SpecificDatesScheduleParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "specific_dates_schedule[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionChargeFutureRenewalsParams build() {
-      return new SubscriptionChargeFutureRenewalsParams(this);
-    }
-  }
-
-  public enum ScheduleType {
-    IMMEDIATE("immediate"),
-
-    SPECIFIC_DATES("specific_dates"),
-
-    FIXED_INTERVALS("fixed_intervals"),
-
-    /** An enum member indicating that ScheduleType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ScheduleType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ScheduleType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ScheduleType enumValue : ScheduleType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class FixedIntervalScheduleParams {
-
-    private final Map<String, Object> formData;
-
-    private FixedIntervalScheduleParams(FixedIntervalScheduleBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for FixedIntervalScheduleParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static FixedIntervalScheduleBuilder builder() {
-      return new FixedIntervalScheduleBuilder();
-    }
-
-    public static final class FixedIntervalScheduleBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private FixedIntervalScheduleBuilder() {}
-
-      public FixedIntervalScheduleBuilder numberOfOccurrences(Integer value) {
-
-        formData.put("number_of_occurrences", value);
-
-        return this;
-      }
-
-      public FixedIntervalScheduleBuilder daysBeforeRenewal(Integer value) {
-
-        formData.put("days_before_renewal", value);
-
-        return this;
-      }
-
-      public FixedIntervalScheduleBuilder endScheduleOn(EndScheduleOn value) {
-
-        formData.put("end_schedule_on", value);
-
-        return this;
-      }
-
-      public FixedIntervalScheduleBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public FixedIntervalScheduleParams build() {
-        return new FixedIntervalScheduleParams(this);
-      }
-    }
-
-    public enum EndScheduleOn {
-      AFTER_NUMBER_OF_INTERVALS("after_number_of_intervals"),
-
-      SPECIFIC_DATE("specific_date"),
-
-      SUBSCRIPTION_END("subscription_end"),
-
-      /** An enum member indicating that EndScheduleOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EndScheduleOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EndScheduleOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EndScheduleOn enumValue : EndScheduleOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SpecificDatesScheduleParams {
-
-    private final Map<String, Object> formData;
-
-    private SpecificDatesScheduleParams(SpecificDatesScheduleBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SpecificDatesScheduleParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SpecificDatesScheduleBuilder builder() {
-      return new SpecificDatesScheduleBuilder();
-    }
-
-    public static final class SpecificDatesScheduleBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SpecificDatesScheduleBuilder() {}
-
-      public SpecificDatesScheduleBuilder termsToCharge(Integer value) {
-
-        formData.put("terms_to_charge", value);
-
-        return this;
-      }
-
-      public SpecificDatesScheduleBuilder date(Timestamp value) {
-
-        formData.put("date", value);
-
-        return this;
-      }
-
-      public SpecificDatesScheduleParams build() {
-        return new SpecificDatesScheduleParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionContractTermsForSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionContractTermsForSubscriptionParams.java
deleted file mode 100644
index 2e914f50..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionContractTermsForSubscriptionParams.java
+++ /dev/null
@@ -1,157 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class SubscriptionContractTermsForSubscriptionParams {
-
-  private final Map<String, Object> queryParams;
-
-  private SubscriptionContractTermsForSubscriptionParams(
-      SubscriptionContractTermsForSubscriptionBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public SubscriptionContractTermsForSubscriptionBuilder toBuilder() {
-    SubscriptionContractTermsForSubscriptionBuilder builder =
-        new SubscriptionContractTermsForSubscriptionBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for SubscriptionContractTermsForSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionContractTermsForSubscriptionBuilder builder() {
-    return new SubscriptionContractTermsForSubscriptionBuilder();
-  }
-
-  public static final class SubscriptionContractTermsForSubscriptionBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private SubscriptionContractTermsForSubscriptionBuilder() {}
-
-    public SubscriptionContractTermsForSubscriptionBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public SubscriptionContractTermsForSubscriptionBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public SortBySortBuilder sortBy() {
-      return new SortBySortBuilder("sort_by", this);
-    }
-
-    public SubscriptionContractTermsForSubscriptionParams build() {
-      return new SubscriptionContractTermsForSubscriptionParams(this);
-    }
-
-    public static final class SortBySortBuilder {
-      private final String fieldName;
-      private final SubscriptionContractTermsForSubscriptionBuilder builder;
-
-      SortBySortBuilder(String fieldName, SubscriptionContractTermsForSubscriptionBuilder builder) {
-        this.fieldName = fieldName;
-        this.builder = builder;
-      }
-
-      public SortDirection created_at() {
-        return new SortDirection(fieldName, "created_at", builder);
-      }
-    }
-
-    public static final class SortDirection {
-      private final String fieldName;
-      private final String selectedField;
-      private final SubscriptionContractTermsForSubscriptionBuilder builder;
-
-      SortDirection(
-          String fieldName,
-          String selectedField,
-          SubscriptionContractTermsForSubscriptionBuilder builder) {
-        this.fieldName = fieldName;
-        this.selectedField = selectedField;
-        this.builder = builder;
-      }
-
-      public SubscriptionContractTermsForSubscriptionBuilder asc() {
-        builder.queryParams.put(fieldName + "[asc]", selectedField);
-        return builder;
-      }
-
-      public SubscriptionContractTermsForSubscriptionBuilder desc() {
-        builder.queryParams.put(fieldName + "[desc]", selectedField);
-        return builder;
-      }
-    }
-  }
-
-  public enum SortByAsc {
-    CREATED_AT("created_at"),
-
-    /** An enum member indicating that SortByAsc was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    SortByAsc(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static SortByAsc fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (SortByAsc enumValue : SortByAsc.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum SortByDesc {
-    CREATED_AT("created_at"),
-
-    /** An enum member indicating that SortByDesc was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    SortByDesc(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static SortByDesc fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (SortByDesc enumValue : SortByDesc.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCreateForCustomerParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCreateForCustomerParams.java
deleted file mode 100644
index d2cabcf5..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCreateForCustomerParams.java
+++ /dev/null
@@ -1,1287 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class SubscriptionCreateForCustomerParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionCreateForCustomerParams(SubscriptionCreateForCustomerBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionCreateForCustomerParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionCreateForCustomerBuilder builder() {
-    return new SubscriptionCreateForCustomerBuilder();
-  }
-
-  public static final class SubscriptionCreateForCustomerBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionCreateForCustomerBuilder() {}
-
-    public SubscriptionCreateForCustomerBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder planId(String value) {
-
-      formData.put("plan_id", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder planQuantity(Integer value) {
-
-      formData.put("plan_quantity", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder planQuantityInDecimal(String value) {
-
-      formData.put("plan_quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder planUnitPrice(Long value) {
-
-      formData.put("plan_unit_price", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder planUnitPriceInDecimal(String value) {
-
-      formData.put("plan_unit_price_in_decimal", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder setupFee(Long value) {
-
-      formData.put("setup_fee", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder trialEnd(Timestamp value) {
-
-      formData.put("trial_end", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder mandatoryAddonsToRemove(List<String> value) {
-
-      formData.put("mandatory_addons_to_remove", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder startDate(Timestamp value) {
-
-      formData.put("start_date", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionCreateForCustomerBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-      formData.put("offline_payment_method", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder overrideRelationship(Boolean value) {
-
-      formData.put("override_relationship", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder replacePrimaryPaymentSource(Boolean value) {
-
-      formData.put("replace_primary_payment_source", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder freePeriod(Integer value) {
-
-      formData.put("free_period", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder freePeriodUnit(FreePeriodUnit value) {
-
-      formData.put("free_period_unit", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-      formData.put("contract_term_billing_cycle_on_renewal", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder trialEndAction(TrialEndAction value) {
-
-      formData.put("trial_end_action", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder paymentInitiator(PaymentInitiator value) {
-
-      formData.put("payment_initiator", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder statementDescriptor(
-        StatementDescriptorParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerBuilder eventBasedAddons(
-        List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionCreateForCustomerBuilder coupons(List<CouponsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public SubscriptionCreateForCustomerBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public SubscriptionCreateForCustomerBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateForCustomerParams build() {
-      return new SubscriptionCreateForCustomerParams(this);
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum OfflinePaymentMethod {
-    NO_PREFERENCE("no_preference"),
-
-    CASH("cash"),
-
-    CHECK("check"),
-
-    BANK_TRANSFER("bank_transfer"),
-
-    ACH_CREDIT("ach_credit"),
-
-    SEPA_CREDIT("sepa_credit"),
-
-    BOLETO("boleto"),
-
-    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-    CUSTOM("custom"),
-
-    /**
-     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    OfflinePaymentMethod(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static OfflinePaymentMethod fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum FreePeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    FreePeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static FreePeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TrialEndAction {
-    SITE_DEFAULT("site_default"),
-
-    PLAN_DEFAULT("plan_default"),
-
-    ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-    CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TrialEndAction(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TrialEndAction fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TrialEndAction enumValue : TrialEndAction.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PaymentInitiator {
-    CUSTOMER("customer"),
-
-    MERCHANT("merchant"),
-
-    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentInitiator(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentInitiator fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatementDescriptorParams {
-
-    private final Map<String, Object> formData;
-
-    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatementDescriptorParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatementDescriptorBuilder builder() {
-      return new StatementDescriptorBuilder();
-    }
-
-    public static final class StatementDescriptorBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatementDescriptorBuilder() {}
-
-      public StatementDescriptorBuilder descriptor(String value) {
-
-        formData.put("descriptor", value);
-
-        return this;
-      }
-
-      public StatementDescriptorParams build() {
-        return new StatementDescriptorParams(this);
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AddonsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
-
-        formData.put("charge_on", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOn {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOn enumValue : ChargeOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsParams(CouponsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsBuilder builder() {
-      return new CouponsBuilder();
-    }
-
-    public static final class CouponsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsBuilder() {}
-
-      public CouponsBuilder couponId(String value) {
-
-        formData.put("coupon_id", value);
-
-        return this;
-      }
-
-      public CouponsBuilder applyTill(Timestamp value) {
-
-        formData.put("apply_till", value);
-
-        return this;
-      }
-
-      public CouponsParams build() {
-        return new CouponsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCreateParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCreateParams.java
deleted file mode 100644
index aab0c407..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCreateParams.java
+++ /dev/null
@@ -1,2981 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class SubscriptionCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionCreateParams(SubscriptionCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionCreateBuilder builder() {
-    return new SubscriptionCreateBuilder();
-  }
-
-  public static final class SubscriptionCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionCreateBuilder() {}
-
-    public SubscriptionCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder planId(String value) {
-
-      formData.put("plan_id", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder planQuantity(Integer value) {
-
-      formData.put("plan_quantity", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder planQuantityInDecimal(String value) {
-
-      formData.put("plan_quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder planUnitPrice(Long value) {
-
-      formData.put("plan_unit_price", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder planUnitPriceInDecimal(String value) {
-
-      formData.put("plan_unit_price_in_decimal", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder setupFee(Long value) {
-
-      formData.put("setup_fee", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder trialEnd(Timestamp value) {
-
-      formData.put("trial_end", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder mandatoryAddonsToRemove(List<String> value) {
-
-      formData.put("mandatory_addons_to_remove", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder startDate(Timestamp value) {
-
-      formData.put("start_date", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionCreateBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-      formData.put("offline_payment_method", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder tokenId(String value) {
-
-      formData.put("token_id", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder affiliateToken(String value) {
-
-      formData.put("affiliate_token", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionCreateBuilder createdFromIp(String value) {
-
-      formData.put("created_from_ip", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder freePeriod(Integer value) {
-
-      formData.put("free_period", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder freePeriodUnit(FreePeriodUnit value) {
-
-      formData.put("free_period_unit", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-      formData.put("contract_term_billing_cycle_on_renewal", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder trialEndAction(TrialEndAction value) {
-
-      formData.put("trial_end_action", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder clientProfileId(String value) {
-
-      formData.put("client_profile_id", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder paymentInitiator(PaymentInitiator value) {
-
-      formData.put("payment_initiator", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateBuilder bankAccount(BankAccountParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "bank_account[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateBuilder paymentMethod(PaymentMethodParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_method[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateBuilder statementDescriptor(StatementDescriptorParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateBuilder entityIdentifiers(List<EntityIdentifiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EntityIdentifiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "entity_identifiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionCreateBuilder coupons(List<CouponsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public SubscriptionCreateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public SubscriptionCreateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateParams build() {
-      return new SubscriptionCreateParams(this);
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum OfflinePaymentMethod {
-    NO_PREFERENCE("no_preference"),
-
-    CASH("cash"),
-
-    CHECK("check"),
-
-    BANK_TRANSFER("bank_transfer"),
-
-    ACH_CREDIT("ach_credit"),
-
-    SEPA_CREDIT("sepa_credit"),
-
-    BOLETO("boleto"),
-
-    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-    CUSTOM("custom"),
-
-    /**
-     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    OfflinePaymentMethod(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static OfflinePaymentMethod fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum FreePeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    FreePeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static FreePeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TrialEndAction {
-    SITE_DEFAULT("site_default"),
-
-    PLAN_DEFAULT("plan_default"),
-
-    ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-    CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TrialEndAction(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TrialEndAction fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TrialEndAction enumValue : TrialEndAction.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PaymentInitiator {
-    CUSTOMER("customer"),
-
-    MERCHANT("merchant"),
-
-    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentInitiator(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentInitiator fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public CustomerBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public CustomerBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public CustomerBuilder locale(String value) {
-
-        formData.put("locale", value);
-
-        return this;
-      }
-
-      public CustomerBuilder taxability(Taxability value) {
-
-        formData.put("taxability", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityCode(EntityCode value) {
-
-        formData.put("entity_code", value);
-
-        return this;
-      }
-
-      public CustomerBuilder exemptNumber(String value) {
-
-        formData.put("exempt_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder netTermDays(Integer value) {
-
-        formData.put("net_term_days", value);
-
-        return this;
-      }
-
-      public CustomerBuilder taxjarExemptionCategory(TaxjarExemptionCategory value) {
-
-        formData.put("taxjar_exemption_category", value);
-
-        return this;
-      }
-
-      public CustomerBuilder autoCollection(AutoCollection value) {
-
-        formData.put("auto_collection", value);
-
-        return this;
-      }
-
-      public CustomerBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-        formData.put("offline_payment_method", value);
-
-        return this;
-      }
-
-      public CustomerBuilder allowDirectDebit(Boolean value) {
-
-        formData.put("allow_direct_debit", value);
-
-        return this;
-      }
-
-      public CustomerBuilder consolidatedInvoicing(Boolean value) {
-
-        formData.put("consolidated_invoicing", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityIdentifierScheme(String value) {
-
-        formData.put("entity_identifier_scheme", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityIdentifierStandard(String value) {
-
-        formData.put("entity_identifier_standard", value);
-
-        return this;
-      }
-
-      public CustomerBuilder isEinvoiceEnabled(Boolean value) {
-
-        formData.put("is_einvoice_enabled", value);
-
-        return this;
-      }
-
-      public CustomerBuilder einvoicingMethod(EinvoicingMethod value) {
-
-        formData.put("einvoicing_method", value);
-
-        return this;
-      }
-
-      public CustomerBuilder registeredForGst(Boolean value) {
-
-        formData.put("registered_for_gst", value);
-
-        return this;
-      }
-
-      public CustomerBuilder businessCustomerWithoutVatNumber(Boolean value) {
-
-        formData.put("business_customer_without_vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder exemptionDetails(List<Object> value) {
-
-        formData.put("exemption_details", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CustomerBuilder customerType(CustomerType value) {
-
-        formData.put("customer_type", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-
-    public enum Taxability {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Taxability was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Taxability(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Taxability fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Taxability enumValue : Taxability.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum EntityCode {
-      A("a"),
-
-      B("b"),
-
-      C("c"),
-
-      D("d"),
-
-      E("e"),
-
-      F("f"),
-
-      G("g"),
-
-      H("h"),
-
-      I("i"),
-
-      J("j"),
-
-      K("k"),
-
-      L("l"),
-
-      M("m"),
-
-      N("n"),
-
-      P("p"),
-
-      Q("q"),
-
-      R("r"),
-
-      MED_1("med1"),
-
-      MED_2("med2"),
-
-      /** An enum member indicating that EntityCode was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityCode(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityCode fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityCode enumValue : EntityCode.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum TaxjarExemptionCategory {
-      WHOLESALE("wholesale"),
-
-      GOVERNMENT("government"),
-
-      OTHER("other"),
-
-      /**
-       * An enum member indicating that TaxjarExemptionCategory was instantiated with an unknown
-       * value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      TaxjarExemptionCategory(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static TaxjarExemptionCategory fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (TaxjarExemptionCategory enumValue : TaxjarExemptionCategory.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum AutoCollection {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AutoCollection(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AutoCollection fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AutoCollection enumValue : AutoCollection.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OfflinePaymentMethod {
-      NO_PREFERENCE("no_preference"),
-
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      ACH_CREDIT("ach_credit"),
-
-      SEPA_CREDIT("sepa_credit"),
-
-      BOLETO("boleto"),
-
-      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-      CUSTOM("custom"),
-
-      /**
-       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      OfflinePaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OfflinePaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum EinvoicingMethod {
-      AUTOMATIC("automatic"),
-
-      MANUAL("manual"),
-
-      SITE_DEFAULT("site_default"),
-
-      /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EinvoicingMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EinvoicingMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum CustomerType {
-      RESIDENTIAL("residential"),
-
-      BUSINESS("business"),
-
-      SENIOR_CITIZEN("senior_citizen"),
-
-      INDUSTRIAL("industrial"),
-
-      /** An enum member indicating that CustomerType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      CustomerType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static CustomerType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (CustomerType enumValue : CustomerType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CardBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public CardBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CardBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CardBuilder number(String value) {
-
-        formData.put("number", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryMonth(Integer value) {
-
-        formData.put("expiry_month", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryYear(Integer value) {
-
-        formData.put("expiry_year", value);
-
-        return this;
-      }
-
-      public CardBuilder cvv(String value) {
-
-        formData.put("cvv", value);
-
-        return this;
-      }
-
-      public CardBuilder preferredScheme(PreferredScheme value) {
-
-        formData.put("preferred_scheme", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr1(String value) {
-
-        formData.put("billing_addr1", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr2(String value) {
-
-        formData.put("billing_addr2", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCity(String value) {
-
-        formData.put("billing_city", value);
-
-        return this;
-      }
-
-      public CardBuilder billingStateCode(String value) {
-
-        formData.put("billing_state_code", value);
-
-        return this;
-      }
-
-      public CardBuilder billingState(String value) {
-
-        formData.put("billing_state", value);
-
-        return this;
-      }
-
-      public CardBuilder billingZip(String value) {
-
-        formData.put("billing_zip", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCountry(String value) {
-
-        formData.put("billing_country", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CardBuilder ipAddress(String value) {
-
-        formData.put("ip_address", value);
-
-        return this;
-      }
-
-      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PreferredScheme {
-      CARTES_BANCAIRES("cartes_bancaires"),
-
-      MASTERCARD("mastercard"),
-
-      VISA("visa"),
-
-      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PreferredScheme(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PreferredScheme fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PreferredScheme enumValue : PreferredScheme.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BankAccountParams {
-
-    private final Map<String, Object> formData;
-
-    private BankAccountParams(BankAccountBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BankAccountParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BankAccountBuilder builder() {
-      return new BankAccountBuilder();
-    }
-
-    public static final class BankAccountBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BankAccountBuilder() {}
-
-      public BankAccountBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder iban(String value) {
-
-        formData.put("iban", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder bankName(String value) {
-
-        formData.put("bank_name", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountNumber(String value) {
-
-        formData.put("account_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder routingNumber(String value) {
-
-        formData.put("routing_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder bankCode(String value) {
-
-        formData.put("bank_code", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountType(AccountType value) {
-
-        formData.put("account_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder accountHolderType(AccountHolderType value) {
-
-        formData.put("account_holder_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder echeckType(EcheckType value) {
-
-        formData.put("echeck_type", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder issuingCountry(String value) {
-
-        formData.put("issuing_country", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder swedishIdentityNumber(String value) {
-
-        formData.put("swedish_identity_number", value);
-
-        return this;
-      }
-
-      public BankAccountBuilder billingAddress(java.util.Map<String, Object> value) {
-
-        formData.put("billing_address", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public BankAccountParams build() {
-        return new BankAccountParams(this);
-      }
-    }
-
-    public enum AccountType {
-      CHECKING("checking"),
-
-      SAVINGS("savings"),
-
-      BUSINESS_CHECKING("business_checking"),
-
-      CURRENT("current"),
-
-      /** An enum member indicating that AccountType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AccountType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AccountType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AccountType enumValue : AccountType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum AccountHolderType {
-      INDIVIDUAL("individual"),
-
-      COMPANY("company"),
-
-      /**
-       * An enum member indicating that AccountHolderType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      AccountHolderType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AccountHolderType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AccountHolderType enumValue : AccountHolderType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum EcheckType {
-      WEB("web"),
-
-      PPD("ppd"),
-
-      CCD("ccd"),
-
-      /** An enum member indicating that EcheckType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EcheckType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EcheckType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EcheckType enumValue : EcheckType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentMethodParams(PaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentMethodBuilder builder() {
-      return new PaymentMethodBuilder();
-    }
-
-    public static final class PaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentMethodBuilder() {}
-
-      public PaymentMethodBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentMethodBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder issuingCountry(String value) {
-
-        formData.put("issuing_country", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentMethodParams build() {
-        return new PaymentMethodParams(this);
-      }
-    }
-
-    public enum Type {
-      CARD("card"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      GENERIC("generic"),
-
-      ALIPAY("alipay"),
-
-      UNIONPAY("unionpay"),
-
-      APPLE_PAY("apple_pay"),
-
-      WECHAT_PAY("wechat_pay"),
-
-      IDEAL("ideal"),
-
-      GOOGLE_PAY("google_pay"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GIROPAY("giropay"),
-
-      DOTPAY("dotpay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      VENMO("venmo"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      GOCARDLESS("gocardless"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatementDescriptorParams {
-
-    private final Map<String, Object> formData;
-
-    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatementDescriptorParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatementDescriptorBuilder builder() {
-      return new StatementDescriptorBuilder();
-    }
-
-    public static final class StatementDescriptorBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatementDescriptorBuilder() {}
-
-      public StatementDescriptorBuilder descriptor(String value) {
-
-        formData.put("descriptor", value);
-
-        return this;
-      }
-
-      public StatementDescriptorParams build() {
-        return new StatementDescriptorParams(this);
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class EntityIdentifiersParams {
-
-    private final Map<String, Object> formData;
-
-    private EntityIdentifiersParams(EntityIdentifiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EntityIdentifiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EntityIdentifiersBuilder builder() {
-      return new EntityIdentifiersBuilder();
-    }
-
-    public static final class EntityIdentifiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EntityIdentifiersBuilder() {}
-
-      public EntityIdentifiersBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder scheme(String value) {
-
-        formData.put("scheme", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersBuilder standard(String value) {
-
-        formData.put("standard", value);
-
-        return this;
-      }
-
-      public EntityIdentifiersParams build() {
-        return new EntityIdentifiersParams(this);
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AddonsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
-
-        formData.put("charge_on", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOn {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOn enumValue : ChargeOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsParams(CouponsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsBuilder builder() {
-      return new CouponsBuilder();
-    }
-
-    public static final class CouponsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsBuilder() {}
-
-      public CouponsBuilder couponId(String value) {
-
-        formData.put("coupon_id", value);
-
-        return this;
-      }
-
-      public CouponsBuilder applyTill(Timestamp value) {
-
-        formData.put("apply_till", value);
-
-        return this;
-      }
-
-      public CouponsParams build() {
-        return new CouponsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCreateWithItemsParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCreateWithItemsParams.java
deleted file mode 100644
index 881fb0b0..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionCreateWithItemsParams.java
+++ /dev/null
@@ -1,1683 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class SubscriptionCreateWithItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionCreateWithItemsParams(SubscriptionCreateWithItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionCreateWithItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionCreateWithItemsBuilder builder() {
-    return new SubscriptionCreateWithItemsBuilder();
-  }
-
-  public static final class SubscriptionCreateWithItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionCreateWithItemsBuilder() {}
-
-    public SubscriptionCreateWithItemsBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder businessEntityId(String value) {
-
-      formData.put("business_entity_id", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder trialEnd(Timestamp value) {
-
-      formData.put("trial_end", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionCreateWithItemsBuilder setupFee(Long value) {
-
-      formData.put("setup_fee", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder mandatoryItemsToRemove(List<String> value) {
-
-      formData.put("mandatory_items_to_remove", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder netTermDays(Integer value) {
-
-      formData.put("net_term_days", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder startDate(Timestamp value) {
-
-      formData.put("start_date", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionCreateWithItemsBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-      formData.put("offline_payment_method", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder overrideRelationship(Boolean value) {
-
-      formData.put("override_relationship", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder replacePrimaryPaymentSource(Boolean value) {
-
-      formData.put("replace_primary_payment_source", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder freePeriod(Integer value) {
-
-      formData.put("free_period", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder freePeriodUnit(FreePeriodUnit value) {
-
-      formData.put("free_period_unit", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-      formData.put("contract_term_billing_cycle_on_renewal", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder createPendingInvoices(Boolean value) {
-
-      formData.put("create_pending_invoices", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder autoCloseInvoices(Boolean value) {
-
-      formData.put("auto_close_invoices", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder firstInvoicePending(Boolean value) {
-
-      formData.put("first_invoice_pending", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder trialEndAction(TrialEndAction value) {
-
-      formData.put("trial_end_action", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder paymentInitiator(PaymentInitiator value) {
-
-      formData.put("payment_initiator", value);
-
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder statementDescriptor(StatementDescriptorParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder billingOverride(BillingOverrideParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_override[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionCreateWithItemsBuilder coupons(List<CouponsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public SubscriptionCreateWithItemsBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public SubscriptionCreateWithItemsBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionCreateWithItemsParams build() {
-      return new SubscriptionCreateWithItemsParams(this);
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum OfflinePaymentMethod {
-    NO_PREFERENCE("no_preference"),
-
-    CASH("cash"),
-
-    CHECK("check"),
-
-    BANK_TRANSFER("bank_transfer"),
-
-    ACH_CREDIT("ach_credit"),
-
-    SEPA_CREDIT("sepa_credit"),
-
-    BOLETO("boleto"),
-
-    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-    CUSTOM("custom"),
-
-    /**
-     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    OfflinePaymentMethod(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static OfflinePaymentMethod fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum FreePeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    FreePeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static FreePeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TrialEndAction {
-    SITE_DEFAULT("site_default"),
-
-    PLAN_DEFAULT("plan_default"),
-
-    ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-    CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TrialEndAction(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TrialEndAction fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TrialEndAction enumValue : TrialEndAction.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PaymentInitiator {
-    CUSTOMER("customer"),
-
-    MERCHANT("merchant"),
-
-    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentInitiator(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentInitiator fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatementDescriptorParams {
-
-    private final Map<String, Object> formData;
-
-    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatementDescriptorParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatementDescriptorBuilder builder() {
-      return new StatementDescriptorBuilder();
-    }
-
-    public static final class StatementDescriptorBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatementDescriptorBuilder() {}
-
-      public StatementDescriptorBuilder descriptor(String value) {
-
-        formData.put("descriptor", value);
-
-        return this;
-      }
-
-      public StatementDescriptorParams build() {
-        return new StatementDescriptorParams(this);
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public ContractTermBuilder contractStart(Timestamp value) {
-
-        formData.put("contract_start", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingOverrideParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingOverrideParams(BillingOverrideBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingOverrideParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingOverrideBuilder builder() {
-      return new BillingOverrideBuilder();
-    }
-
-    public static final class BillingOverrideBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingOverrideBuilder() {}
-
-      public BillingOverrideBuilder maxExcessPaymentUsage(Long value) {
-
-        formData.put("max_excess_payment_usage", value);
-
-        return this;
-      }
-
-      public BillingOverrideBuilder maxRefundableCreditsUsage(Long value) {
-
-        formData.put("max_refundable_credits_usage", value);
-
-        return this;
-      }
-
-      public BillingOverrideParams build() {
-        return new BillingOverrideParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder usageAccumulationResetFrequency(
-          UsageAccumulationResetFrequency value) {
-
-        formData.put("usage_accumulation_reset_frequency", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum UsageAccumulationResetFrequency {
-      NEVER("never"),
-
-      SUBSCRIPTION_BILLING_FREQUENCY("subscription_billing_frequency"),
-
-      /**
-       * An enum member indicating that UsageAccumulationResetFrequency was instantiated with an
-       * unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      UsageAccumulationResetFrequency(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static UsageAccumulationResetFrequency fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (UsageAccumulationResetFrequency enumValue : UsageAccumulationResetFrequency.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsParams(CouponsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsBuilder builder() {
-      return new CouponsBuilder();
-    }
-
-    public static final class CouponsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsBuilder() {}
-
-      public CouponsBuilder couponId(String value) {
-
-        formData.put("coupon_id", value);
-
-        return this;
-      }
-
-      public CouponsBuilder applyTill(Timestamp value) {
-
-        formData.put("apply_till", value);
-
-        return this;
-      }
-
-      public CouponsParams build() {
-        return new CouponsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionEditAdvanceInvoiceScheduleParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionEditAdvanceInvoiceScheduleParams.java
deleted file mode 100644
index 246d7903..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionEditAdvanceInvoiceScheduleParams.java
+++ /dev/null
@@ -1,256 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class SubscriptionEditAdvanceInvoiceScheduleParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionEditAdvanceInvoiceScheduleParams(
-      SubscriptionEditAdvanceInvoiceScheduleBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionEditAdvanceInvoiceScheduleParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionEditAdvanceInvoiceScheduleBuilder builder() {
-    return new SubscriptionEditAdvanceInvoiceScheduleBuilder();
-  }
-
-  public static final class SubscriptionEditAdvanceInvoiceScheduleBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionEditAdvanceInvoiceScheduleBuilder() {}
-
-    public SubscriptionEditAdvanceInvoiceScheduleBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public SubscriptionEditAdvanceInvoiceScheduleBuilder scheduleType(ScheduleType value) {
-
-      formData.put("schedule_type", value);
-
-      return this;
-    }
-
-    public SubscriptionEditAdvanceInvoiceScheduleBuilder fixedIntervalSchedule(
-        FixedIntervalScheduleParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "fixed_interval_schedule[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionEditAdvanceInvoiceScheduleBuilder specificDatesSchedule(
-        List<SpecificDatesScheduleParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SpecificDatesScheduleParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "specific_dates_schedule[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionEditAdvanceInvoiceScheduleParams build() {
-      return new SubscriptionEditAdvanceInvoiceScheduleParams(this);
-    }
-  }
-
-  public enum ScheduleType {
-    SPECIFIC_DATES("specific_dates"),
-
-    FIXED_INTERVALS("fixed_intervals"),
-
-    /** An enum member indicating that ScheduleType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ScheduleType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ScheduleType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ScheduleType enumValue : ScheduleType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class FixedIntervalScheduleParams {
-
-    private final Map<String, Object> formData;
-
-    private FixedIntervalScheduleParams(FixedIntervalScheduleBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for FixedIntervalScheduleParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static FixedIntervalScheduleBuilder builder() {
-      return new FixedIntervalScheduleBuilder();
-    }
-
-    public static final class FixedIntervalScheduleBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private FixedIntervalScheduleBuilder() {}
-
-      public FixedIntervalScheduleBuilder numberOfOccurrences(Integer value) {
-
-        formData.put("number_of_occurrences", value);
-
-        return this;
-      }
-
-      public FixedIntervalScheduleBuilder daysBeforeRenewal(Integer value) {
-
-        formData.put("days_before_renewal", value);
-
-        return this;
-      }
-
-      public FixedIntervalScheduleBuilder endScheduleOn(EndScheduleOn value) {
-
-        formData.put("end_schedule_on", value);
-
-        return this;
-      }
-
-      public FixedIntervalScheduleBuilder endDate(Timestamp value) {
-
-        formData.put("end_date", value);
-
-        return this;
-      }
-
-      public FixedIntervalScheduleParams build() {
-        return new FixedIntervalScheduleParams(this);
-      }
-    }
-
-    public enum EndScheduleOn {
-      AFTER_NUMBER_OF_INTERVALS("after_number_of_intervals"),
-
-      SPECIFIC_DATE("specific_date"),
-
-      SUBSCRIPTION_END("subscription_end"),
-
-      /** An enum member indicating that EndScheduleOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EndScheduleOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EndScheduleOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EndScheduleOn enumValue : EndScheduleOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SpecificDatesScheduleParams {
-
-    private final Map<String, Object> formData;
-
-    private SpecificDatesScheduleParams(SpecificDatesScheduleBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SpecificDatesScheduleParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SpecificDatesScheduleBuilder builder() {
-      return new SpecificDatesScheduleBuilder();
-    }
-
-    public static final class SpecificDatesScheduleBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SpecificDatesScheduleBuilder() {}
-
-      public SpecificDatesScheduleBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SpecificDatesScheduleBuilder termsToCharge(Integer value) {
-
-        formData.put("terms_to_charge", value);
-
-        return this;
-      }
-
-      public SpecificDatesScheduleBuilder date(Timestamp value) {
-
-        formData.put("date", value);
-
-        return this;
-      }
-
-      public SpecificDatesScheduleParams build() {
-        return new SpecificDatesScheduleParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportContractTermParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportContractTermParams.java
deleted file mode 100644
index a3adbbfb..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportContractTermParams.java
+++ /dev/null
@@ -1,240 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class SubscriptionImportContractTermParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionImportContractTermParams(SubscriptionImportContractTermBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionImportContractTermParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionImportContractTermBuilder builder() {
-    return new SubscriptionImportContractTermBuilder();
-  }
-
-  public static final class SubscriptionImportContractTermBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionImportContractTermBuilder() {}
-
-    public SubscriptionImportContractTermBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-      formData.put("contract_term_billing_cycle_on_renewal", value);
-
-      return this;
-    }
-
-    public SubscriptionImportContractTermBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportContractTermParams build() {
-      return new SubscriptionImportContractTermParams(this);
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder createdAt(Timestamp value) {
-
-        formData.put("created_at", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder contractStart(Timestamp value) {
-
-        formData.put("contract_start", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder contractEnd(Timestamp value) {
-
-        formData.put("contract_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder status(Status value) {
-
-        formData.put("status", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder totalAmountRaised(Long value) {
-
-        formData.put("total_amount_raised", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder totalAmountRaisedBeforeTax(Long value) {
-
-        formData.put("total_amount_raised_before_tax", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder totalContractValue(Long value) {
-
-        formData.put("total_contract_value", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder totalContractValueBeforeTax(Long value) {
-
-        formData.put("total_contract_value_before_tax", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder billingCycle(Integer value) {
-
-        formData.put("billing_cycle", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum Status {
-      ACTIVE("active"),
-
-      COMPLETED("completed"),
-
-      CANCELLED("cancelled"),
-
-      TERMINATED("terminated"),
-
-      /** An enum member indicating that Status was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Status(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Status fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Status enumValue : Status.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportForCustomerParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportForCustomerParams.java
deleted file mode 100644
index e2a96186..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportForCustomerParams.java
+++ /dev/null
@@ -1,1091 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class SubscriptionImportForCustomerParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionImportForCustomerParams(SubscriptionImportForCustomerBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionImportForCustomerParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionImportForCustomerBuilder builder() {
-    return new SubscriptionImportForCustomerBuilder();
-  }
-
-  public static final class SubscriptionImportForCustomerBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionImportForCustomerBuilder() {}
-
-    public SubscriptionImportForCustomerBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder planId(String value) {
-
-      formData.put("plan_id", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder planQuantity(Integer value) {
-
-      formData.put("plan_quantity", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder planQuantityInDecimal(String value) {
-
-      formData.put("plan_quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder planUnitPrice(Long value) {
-
-      formData.put("plan_unit_price", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder planUnitPriceInDecimal(String value) {
-
-      formData.put("plan_unit_price_in_decimal", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder setupFee(Long value) {
-
-      formData.put("setup_fee", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder trialEnd(Timestamp value) {
-
-      formData.put("trial_end", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder startDate(Timestamp value) {
-
-      formData.put("start_date", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder currentTermEnd(Timestamp value) {
-
-      formData.put("current_term_end", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder currentTermStart(Timestamp value) {
-
-      formData.put("current_term_start", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder trialStart(Timestamp value) {
-
-      formData.put("trial_start", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder cancelledAt(Timestamp value) {
-
-      formData.put("cancelled_at", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder startedAt(Timestamp value) {
-
-      formData.put("started_at", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder activatedAt(Timestamp value) {
-
-      formData.put("activated_at", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder pauseDate(Timestamp value) {
-
-      formData.put("pause_date", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder resumeDate(Timestamp value) {
-
-      formData.put("resume_date", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-      formData.put("contract_term_billing_cycle_on_renewal", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder createCurrentTermInvoice(Boolean value) {
-
-      formData.put("create_current_term_invoice", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder transaction(TransactionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "transaction[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder eventBasedAddons(
-        List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportForCustomerBuilder chargedEventBasedAddons(
-        List<ChargedEventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargedEventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charged_event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionImportForCustomerBuilder coupons(List<CouponsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public SubscriptionImportForCustomerBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public SubscriptionImportForCustomerBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportForCustomerParams build() {
-      return new SubscriptionImportForCustomerParams(this);
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Status {
-    FUTURE("future"),
-
-    IN_TRIAL("in_trial"),
-
-    ACTIVE("active"),
-
-    NON_RENEWING("non_renewing"),
-
-    PAUSED("paused"),
-
-    CANCELLED("cancelled"),
-
-    TRANSFERRED("transferred"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder createdAt(Timestamp value) {
-
-        formData.put("created_at", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder contractStart(Timestamp value) {
-
-        formData.put("contract_start", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder billingCycle(Integer value) {
-
-        formData.put("billing_cycle", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder totalAmountRaised(Long value) {
-
-        formData.put("total_amount_raised", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder totalAmountRaisedBeforeTax(Long value) {
-
-        formData.put("total_amount_raised_before_tax", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TransactionParams {
-
-    private final Map<String, Object> formData;
-
-    private TransactionParams(TransactionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TransactionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TransactionBuilder builder() {
-      return new TransactionBuilder();
-    }
-
-    public static final class TransactionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TransactionBuilder() {}
-
-      public TransactionBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public TransactionBuilder paymentMethod(PaymentMethod value) {
-
-        formData.put("payment_method", value);
-
-        return this;
-      }
-
-      public TransactionBuilder referenceNumber(String value) {
-
-        formData.put("reference_number", value);
-
-        return this;
-      }
-
-      public TransactionBuilder date(Timestamp value) {
-
-        formData.put("date", value);
-
-        return this;
-      }
-
-      public TransactionParams build() {
-        return new TransactionParams(this);
-      }
-    }
-
-    public enum PaymentMethod {
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      OTHER("other"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethod enumValue : PaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChargedEventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargedEventBasedAddonsParams(ChargedEventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargedEventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargedEventBasedAddonsBuilder builder() {
-      return new ChargedEventBasedAddonsBuilder();
-    }
-
-    public static final class ChargedEventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargedEventBasedAddonsBuilder() {}
-
-      public ChargedEventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public ChargedEventBasedAddonsBuilder lastChargedAt(Timestamp value) {
-
-        formData.put("last_charged_at", value);
-
-        return this;
-      }
-
-      public ChargedEventBasedAddonsParams build() {
-        return new ChargedEventBasedAddonsParams(this);
-      }
-    }
-  }
-
-  public static final class CouponsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsParams(CouponsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsBuilder builder() {
-      return new CouponsBuilder();
-    }
-
-    public static final class CouponsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsBuilder() {}
-
-      public CouponsBuilder couponId(String value) {
-
-        formData.put("coupon_id", value);
-
-        return this;
-      }
-
-      public CouponsBuilder applyTill(Timestamp value) {
-
-        formData.put("apply_till", value);
-
-        return this;
-      }
-
-      public CouponsParams build() {
-        return new CouponsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportForItemsParams.java
deleted file mode 100644
index b0471490..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportForItemsParams.java
+++ /dev/null
@@ -1,1392 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class SubscriptionImportForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionImportForItemsParams(SubscriptionImportForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionImportForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionImportForItemsBuilder builder() {
-    return new SubscriptionImportForItemsBuilder();
-  }
-
-  public static final class SubscriptionImportForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionImportForItemsBuilder() {}
-
-    public SubscriptionImportForItemsBuilder exhaustedCouponIds(List<String> value) {
-
-      formData.put("exhausted_coupon_ids", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder trialEnd(Timestamp value) {
-
-      formData.put("trial_end", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionImportForItemsBuilder setupFee(Long value) {
-
-      formData.put("setup_fee", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder netTermDays(Integer value) {
-
-      formData.put("net_term_days", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder startDate(Timestamp value) {
-
-      formData.put("start_date", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder currentTermEnd(Timestamp value) {
-
-      formData.put("current_term_end", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder currentTermStart(Timestamp value) {
-
-      formData.put("current_term_start", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder trialStart(Timestamp value) {
-
-      formData.put("trial_start", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder cancelledAt(Timestamp value) {
-
-      formData.put("cancelled_at", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder startedAt(Timestamp value) {
-
-      formData.put("started_at", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder activatedAt(Timestamp value) {
-
-      formData.put("activated_at", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder pauseDate(Timestamp value) {
-
-      formData.put("pause_date", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder resumeDate(Timestamp value) {
-
-      formData.put("resume_date", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-      formData.put("contract_term_billing_cycle_on_renewal", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder createCurrentTermInvoice(Boolean value) {
-
-      formData.put("create_current_term_invoice", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder cancelReasonCode(String value) {
-
-      formData.put("cancel_reason_code", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder createPendingInvoices(Boolean value) {
-
-      formData.put("create_pending_invoices", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder autoCloseInvoices(Boolean value) {
-
-      formData.put("auto_close_invoices", value);
-
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder transaction(TransactionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "transaction[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder chargedItems(List<ChargedItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargedItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charged_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportForItemsBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionImportForItemsBuilder coupons(List<CouponsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public SubscriptionImportForItemsBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public SubscriptionImportForItemsBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportForItemsParams build() {
-      return new SubscriptionImportForItemsParams(this);
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Status {
-    FUTURE("future"),
-
-    IN_TRIAL("in_trial"),
-
-    ACTIVE("active"),
-
-    NON_RENEWING("non_renewing"),
-
-    PAUSED("paused"),
-
-    CANCELLED("cancelled"),
-
-    TRANSFERRED("transferred"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder createdAt(Timestamp value) {
-
-        formData.put("created_at", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder contractStart(Timestamp value) {
-
-        formData.put("contract_start", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder billingCycle(Integer value) {
-
-        formData.put("billing_cycle", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder totalAmountRaised(Long value) {
-
-        formData.put("total_amount_raised", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder totalAmountRaisedBeforeTax(Long value) {
-
-        formData.put("total_amount_raised_before_tax", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TransactionParams {
-
-    private final Map<String, Object> formData;
-
-    private TransactionParams(TransactionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TransactionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TransactionBuilder builder() {
-      return new TransactionBuilder();
-    }
-
-    public static final class TransactionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TransactionBuilder() {}
-
-      public TransactionBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public TransactionBuilder paymentMethod(PaymentMethod value) {
-
-        formData.put("payment_method", value);
-
-        return this;
-      }
-
-      public TransactionBuilder referenceNumber(String value) {
-
-        formData.put("reference_number", value);
-
-        return this;
-      }
-
-      public TransactionBuilder date(Timestamp value) {
-
-        formData.put("date", value);
-
-        return this;
-      }
-
-      public TransactionParams build() {
-        return new TransactionParams(this);
-      }
-    }
-
-    public enum PaymentMethod {
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      OTHER("other"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethod enumValue : PaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChargedItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargedItemsParams(ChargedItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargedItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargedItemsBuilder builder() {
-      return new ChargedItemsBuilder();
-    }
-
-    public static final class ChargedItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargedItemsBuilder() {}
-
-      public ChargedItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ChargedItemsBuilder lastChargedAt(Timestamp value) {
-
-        formData.put("last_charged_at", value);
-
-        return this;
-      }
-
-      public ChargedItemsParams build() {
-        return new ChargedItemsParams(this);
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsParams(CouponsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsBuilder builder() {
-      return new CouponsBuilder();
-    }
-
-    public static final class CouponsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsBuilder() {}
-
-      public CouponsBuilder couponId(String value) {
-
-        formData.put("coupon_id", value);
-
-        return this;
-      }
-
-      public CouponsBuilder applyTill(Timestamp value) {
-
-        formData.put("apply_till", value);
-
-        return this;
-      }
-
-      public CouponsParams build() {
-        return new CouponsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportSubscriptionParams.java
deleted file mode 100644
index 87328db0..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportSubscriptionParams.java
+++ /dev/null
@@ -1,2233 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class SubscriptionImportSubscriptionParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionImportSubscriptionParams(SubscriptionImportSubscriptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionImportSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionImportSubscriptionBuilder builder() {
-    return new SubscriptionImportSubscriptionBuilder();
-  }
-
-  public static final class SubscriptionImportSubscriptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionImportSubscriptionBuilder() {}
-
-    public SubscriptionImportSubscriptionBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder clientProfileId(String value) {
-
-      formData.put("client_profile_id", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder planId(String value) {
-
-      formData.put("plan_id", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder planQuantity(Integer value) {
-
-      formData.put("plan_quantity", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder planQuantityInDecimal(String value) {
-
-      formData.put("plan_quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder planUnitPrice(Long value) {
-
-      formData.put("plan_unit_price", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder planUnitPriceInDecimal(String value) {
-
-      formData.put("plan_unit_price_in_decimal", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder setupFee(Long value) {
-
-      formData.put("setup_fee", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder trialEnd(Timestamp value) {
-
-      formData.put("trial_end", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder startDate(Timestamp value) {
-
-      formData.put("start_date", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-      formData.put("contract_term_billing_cycle_on_renewal", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder currentTermEnd(Timestamp value) {
-
-      formData.put("current_term_end", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder currentTermStart(Timestamp value) {
-
-      formData.put("current_term_start", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder trialStart(Timestamp value) {
-
-      formData.put("trial_start", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder cancelledAt(Timestamp value) {
-
-      formData.put("cancelled_at", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder startedAt(Timestamp value) {
-
-      formData.put("started_at", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder activatedAt(Timestamp value) {
-
-      formData.put("activated_at", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder pauseDate(Timestamp value) {
-
-      formData.put("pause_date", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder resumeDate(Timestamp value) {
-
-      formData.put("resume_date", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder createCurrentTermInvoice(Boolean value) {
-
-      formData.put("create_current_term_invoice", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder affiliateToken(String value) {
-
-      formData.put("affiliate_token", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder paymentMethod(PaymentMethodParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_method[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder transaction(TransactionParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "transaction[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder eventBasedAddons(
-        List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionBuilder chargedEventBasedAddons(
-        List<ChargedEventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargedEventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charged_event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionImportSubscriptionBuilder coupons(List<CouponsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public SubscriptionImportSubscriptionBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public SubscriptionImportSubscriptionBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionParams build() {
-      return new SubscriptionImportSubscriptionParams(this);
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Status {
-    FUTURE("future"),
-
-    IN_TRIAL("in_trial"),
-
-    ACTIVE("active"),
-
-    NON_RENEWING("non_renewing"),
-
-    PAUSED("paused"),
-
-    CANCELLED("cancelled"),
-
-    TRANSFERRED("transferred"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public CustomerBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public CustomerBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CustomerBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public CustomerBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public CustomerBuilder locale(String value) {
-
-        formData.put("locale", value);
-
-        return this;
-      }
-
-      public CustomerBuilder taxability(Taxability value) {
-
-        formData.put("taxability", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityCode(EntityCode value) {
-
-        formData.put("entity_code", value);
-
-        return this;
-      }
-
-      public CustomerBuilder exemptNumber(String value) {
-
-        formData.put("exempt_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder netTermDays(Integer value) {
-
-        formData.put("net_term_days", value);
-
-        return this;
-      }
-
-      public CustomerBuilder taxjarExemptionCategory(TaxjarExemptionCategory value) {
-
-        formData.put("taxjar_exemption_category", value);
-
-        return this;
-      }
-
-      public CustomerBuilder customerType(CustomerType value) {
-
-        formData.put("customer_type", value);
-
-        return this;
-      }
-
-      public CustomerBuilder autoCollection(AutoCollection value) {
-
-        formData.put("auto_collection", value);
-
-        return this;
-      }
-
-      public CustomerBuilder allowDirectDebit(Boolean value) {
-
-        formData.put("allow_direct_debit", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-
-    public enum Taxability {
-      TAXABLE("taxable"),
-
-      EXEMPT("exempt"),
-
-      /** An enum member indicating that Taxability was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Taxability(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Taxability fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Taxability enumValue : Taxability.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum EntityCode {
-      A("a"),
-
-      B("b"),
-
-      C("c"),
-
-      D("d"),
-
-      E("e"),
-
-      F("f"),
-
-      G("g"),
-
-      H("h"),
-
-      I("i"),
-
-      J("j"),
-
-      K("k"),
-
-      L("l"),
-
-      M("m"),
-
-      N("n"),
-
-      P("p"),
-
-      Q("q"),
-
-      R("r"),
-
-      MED_1("med1"),
-
-      MED_2("med2"),
-
-      /** An enum member indicating that EntityCode was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityCode(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityCode fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityCode enumValue : EntityCode.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum TaxjarExemptionCategory {
-      WHOLESALE("wholesale"),
-
-      GOVERNMENT("government"),
-
-      OTHER("other"),
-
-      /**
-       * An enum member indicating that TaxjarExemptionCategory was instantiated with an unknown
-       * value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      TaxjarExemptionCategory(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static TaxjarExemptionCategory fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (TaxjarExemptionCategory enumValue : TaxjarExemptionCategory.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum CustomerType {
-      RESIDENTIAL("residential"),
-
-      BUSINESS("business"),
-
-      SENIOR_CITIZEN("senior_citizen"),
-
-      INDUSTRIAL("industrial"),
-
-      /** An enum member indicating that CustomerType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      CustomerType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static CustomerType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (CustomerType enumValue : CustomerType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum AutoCollection {
-      ON("on"),
-
-      OFF("off"),
-
-      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AutoCollection(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AutoCollection fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AutoCollection enumValue : AutoCollection.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder createdAt(Timestamp value) {
-
-        formData.put("created_at", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder contractStart(Timestamp value) {
-
-        formData.put("contract_start", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder billingCycle(Integer value) {
-
-        formData.put("billing_cycle", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder totalAmountRaised(Long value) {
-
-        formData.put("total_amount_raised", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder totalAmountRaisedBeforeTax(Long value) {
-
-        formData.put("total_amount_raised_before_tax", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CardBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public CardBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CardBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CardBuilder number(String value) {
-
-        formData.put("number", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryMonth(Integer value) {
-
-        formData.put("expiry_month", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryYear(Integer value) {
-
-        formData.put("expiry_year", value);
-
-        return this;
-      }
-
-      public CardBuilder cvv(String value) {
-
-        formData.put("cvv", value);
-
-        return this;
-      }
-
-      public CardBuilder preferredScheme(PreferredScheme value) {
-
-        formData.put("preferred_scheme", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr1(String value) {
-
-        formData.put("billing_addr1", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr2(String value) {
-
-        formData.put("billing_addr2", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCity(String value) {
-
-        formData.put("billing_city", value);
-
-        return this;
-      }
-
-      public CardBuilder billingStateCode(String value) {
-
-        formData.put("billing_state_code", value);
-
-        return this;
-      }
-
-      public CardBuilder billingState(String value) {
-
-        formData.put("billing_state", value);
-
-        return this;
-      }
-
-      public CardBuilder billingZip(String value) {
-
-        formData.put("billing_zip", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCountry(String value) {
-
-        formData.put("billing_country", value);
-
-        return this;
-      }
-
-      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PreferredScheme {
-      CARTES_BANCAIRES("cartes_bancaires"),
-
-      MASTERCARD("mastercard"),
-
-      VISA("visa"),
-
-      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PreferredScheme(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PreferredScheme fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PreferredScheme enumValue : PreferredScheme.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentMethodParams(PaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentMethodBuilder builder() {
-      return new PaymentMethodBuilder();
-    }
-
-    public static final class PaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentMethodBuilder() {}
-
-      public PaymentMethodBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentMethodBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder issuingCountry(String value) {
-
-        formData.put("issuing_country", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentMethodParams build() {
-        return new PaymentMethodParams(this);
-      }
-    }
-
-    public enum Type {
-      CARD("card"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      GENERIC("generic"),
-
-      ALIPAY("alipay"),
-
-      UNIONPAY("unionpay"),
-
-      APPLE_PAY("apple_pay"),
-
-      WECHAT_PAY("wechat_pay"),
-
-      IDEAL("ideal"),
-
-      GOOGLE_PAY("google_pay"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GIROPAY("giropay"),
-
-      DOTPAY("dotpay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      VENMO("venmo"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      GOCARDLESS("gocardless"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TransactionParams {
-
-    private final Map<String, Object> formData;
-
-    private TransactionParams(TransactionBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TransactionParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TransactionBuilder builder() {
-      return new TransactionBuilder();
-    }
-
-    public static final class TransactionBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TransactionBuilder() {}
-
-      public TransactionBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public TransactionBuilder paymentMethod(PaymentMethod value) {
-
-        formData.put("payment_method", value);
-
-        return this;
-      }
-
-      public TransactionBuilder referenceNumber(String value) {
-
-        formData.put("reference_number", value);
-
-        return this;
-      }
-
-      public TransactionBuilder date(Timestamp value) {
-
-        formData.put("date", value);
-
-        return this;
-      }
-
-      public TransactionParams build() {
-        return new TransactionParams(this);
-      }
-    }
-
-    public enum PaymentMethod {
-      CASH("cash"),
-
-      CHECK("check"),
-
-      BANK_TRANSFER("bank_transfer"),
-
-      OTHER("other"),
-
-      APP_STORE("app_store"),
-
-      PLAY_STORE("play_store"),
-
-      CUSTOM("custom"),
-
-      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethod enumValue : PaymentMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChargedEventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargedEventBasedAddonsParams(ChargedEventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargedEventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargedEventBasedAddonsBuilder builder() {
-      return new ChargedEventBasedAddonsBuilder();
-    }
-
-    public static final class ChargedEventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargedEventBasedAddonsBuilder() {}
-
-      public ChargedEventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public ChargedEventBasedAddonsBuilder lastChargedAt(Timestamp value) {
-
-        formData.put("last_charged_at", value);
-
-        return this;
-      }
-
-      public ChargedEventBasedAddonsParams build() {
-        return new ChargedEventBasedAddonsParams(this);
-      }
-    }
-  }
-
-  public static final class CouponsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsParams(CouponsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsBuilder builder() {
-      return new CouponsBuilder();
-    }
-
-    public static final class CouponsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsBuilder() {}
-
-      public CouponsBuilder couponId(String value) {
-
-        formData.put("coupon_id", value);
-
-        return this;
-      }
-
-      public CouponsBuilder applyTill(Timestamp value) {
-
-        formData.put("apply_till", value);
-
-        return this;
-      }
-
-      public CouponsParams build() {
-        return new CouponsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportUnbilledChargesParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportUnbilledChargesParams.java
deleted file mode 100644
index 5b255a40..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionImportUnbilledChargesParams.java
+++ /dev/null
@@ -1,458 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class SubscriptionImportUnbilledChargesParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionImportUnbilledChargesParams(
-      SubscriptionImportUnbilledChargesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionImportUnbilledChargesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionImportUnbilledChargesBuilder builder() {
-    return new SubscriptionImportUnbilledChargesBuilder();
-  }
-
-  public static final class SubscriptionImportUnbilledChargesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionImportUnbilledChargesBuilder() {}
-
-    public SubscriptionImportUnbilledChargesBuilder unbilledCharges(
-        List<UnbilledChargesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          UnbilledChargesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "unbilled_charges[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportUnbilledChargesBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportUnbilledChargesBuilder tiers(List<TiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionImportUnbilledChargesParams build() {
-      return new SubscriptionImportUnbilledChargesParams(this);
-    }
-  }
-
-  public static final class UnbilledChargesParams {
-
-    private final Map<String, Object> formData;
-
-    private UnbilledChargesParams(UnbilledChargesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for UnbilledChargesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static UnbilledChargesBuilder builder() {
-      return new UnbilledChargesBuilder();
-    }
-
-    public static final class UnbilledChargesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private UnbilledChargesBuilder() {}
-
-      public UnbilledChargesBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder unitAmount(Long value) {
-
-        formData.put("unit_amount", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder unitAmountInDecimal(String value) {
-
-        formData.put("unit_amount_in_decimal", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder discountAmount(Long value) {
-
-        formData.put("discount_amount", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder useForProration(Boolean value) {
-
-        formData.put("use_for_proration", value);
-
-        return this;
-      }
-
-      public UnbilledChargesBuilder isAdvanceCharge(Boolean value) {
-
-        formData.put("is_advance_charge", value);
-
-        return this;
-      }
-
-      public UnbilledChargesParams build() {
-        return new UnbilledChargesParams(this);
-      }
-    }
-
-    public enum EntityType {
-      ADHOC("adhoc"),
-
-      PLAN_ITEM_PRICE("plan_item_price"),
-
-      ADDON_ITEM_PRICE("addon_item_price"),
-
-      CHARGE_ITEM_PRICE("charge_item_price"),
-
-      PLAN_SETUP("plan_setup"),
-
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder unbilledChargeId(String value) {
-
-        formData.put("unbilled_charge_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder entityType(EntityType value) {
-
-        formData.put("entity_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder entityId(String value) {
-
-        formData.put("entity_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum EntityType {
-      ITEM_LEVEL_COUPON("item_level_coupon"),
-
-      DOCUMENT_LEVEL_COUPON("document_level_coupon"),
-
-      ITEM_LEVEL_DISCOUNT("item_level_discount"),
-
-      DOCUMENT_LEVEL_DISCOUNT("document_level_discount"),
-
-      /** An enum member indicating that EntityType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EntityType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EntityType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EntityType enumValue : EntityType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TiersParams {
-
-    private final Map<String, Object> formData;
-
-    private TiersParams(TiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TiersBuilder builder() {
-      return new TiersBuilder();
-    }
-
-    public static final class TiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TiersBuilder() {}
-
-      public TiersBuilder unbilledChargeId(String value) {
-
-        formData.put("unbilled_charge_id", value);
-
-        return this;
-      }
-
-      public TiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public TiersBuilder quantityUsed(Integer value) {
-
-        formData.put("quantity_used", value);
-
-        return this;
-      }
-
-      public TiersBuilder unitAmount(Long value) {
-
-        formData.put("unit_amount", value);
-
-        return this;
-      }
-
-      public TiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder quantityUsedInDecimal(String value) {
-
-        formData.put("quantity_used_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersBuilder unitAmountInDecimal(String value) {
-
-        formData.put("unit_amount_in_decimal", value);
-
-        return this;
-      }
-
-      public TiersParams build() {
-        return new TiersParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionMoveParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionMoveParams.java
deleted file mode 100644
index 920cc41f..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionMoveParams.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class SubscriptionMoveParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionMoveParams(SubscriptionMoveBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionMoveParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionMoveBuilder builder() {
-    return new SubscriptionMoveBuilder();
-  }
-
-  public static final class SubscriptionMoveBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionMoveBuilder() {}
-
-    public SubscriptionMoveBuilder toCustomerId(String value) {
-
-      formData.put("to_customer_id", value);
-
-      return this;
-    }
-
-    public SubscriptionMoveBuilder copyPaymentSource(Boolean value) {
-
-      formData.put("copy_payment_source", value);
-
-      return this;
-    }
-
-    public SubscriptionMoveParams build() {
-      return new SubscriptionMoveParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionOverrideBillingProfileParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionOverrideBillingProfileParams.java
deleted file mode 100644
index 0208c81a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionOverrideBillingProfileParams.java
+++ /dev/null
@@ -1,86 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class SubscriptionOverrideBillingProfileParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionOverrideBillingProfileParams(
-      SubscriptionOverrideBillingProfileBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionOverrideBillingProfileParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionOverrideBillingProfileBuilder builder() {
-    return new SubscriptionOverrideBillingProfileBuilder();
-  }
-
-  public static final class SubscriptionOverrideBillingProfileBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionOverrideBillingProfileBuilder() {}
-
-    public SubscriptionOverrideBillingProfileBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public SubscriptionOverrideBillingProfileBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public SubscriptionOverrideBillingProfileParams build() {
-      return new SubscriptionOverrideBillingProfileParams(this);
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionPauseParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionPauseParams.java
deleted file mode 100644
index 95675e92..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionPauseParams.java
+++ /dev/null
@@ -1,179 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class SubscriptionPauseParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionPauseParams(SubscriptionPauseBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionPauseParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionPauseBuilder builder() {
-    return new SubscriptionPauseBuilder();
-  }
-
-  public static final class SubscriptionPauseBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionPauseBuilder() {}
-
-    public SubscriptionPauseBuilder pauseOption(PauseOption value) {
-
-      formData.put("pause_option", value);
-
-      return this;
-    }
-
-    public SubscriptionPauseBuilder pauseDate(Timestamp value) {
-
-      formData.put("pause_date", value);
-
-      return this;
-    }
-
-    public SubscriptionPauseBuilder unbilledChargesHandling(UnbilledChargesHandling value) {
-
-      formData.put("unbilled_charges_handling", value);
-
-      return this;
-    }
-
-    public SubscriptionPauseBuilder invoiceDunningHandling(InvoiceDunningHandling value) {
-
-      formData.put("invoice_dunning_handling", value);
-
-      return this;
-    }
-
-    public SubscriptionPauseBuilder skipBillingCycles(Integer value) {
-
-      formData.put("skip_billing_cycles", value);
-
-      return this;
-    }
-
-    public SubscriptionPauseBuilder resumeDate(Timestamp value) {
-
-      formData.put("resume_date", value);
-
-      return this;
-    }
-
-    public SubscriptionPauseParams build() {
-      return new SubscriptionPauseParams(this);
-    }
-  }
-
-  public enum PauseOption {
-    IMMEDIATELY("immediately"),
-
-    END_OF_TERM("end_of_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    BILLING_CYCLES("billing_cycles"),
-
-    /** An enum member indicating that PauseOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PauseOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PauseOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PauseOption enumValue : PauseOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum UnbilledChargesHandling {
-    NO_ACTION("no_action"),
-
-    INVOICE("invoice"),
-
-    /**
-     * An enum member indicating that UnbilledChargesHandling was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    UnbilledChargesHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static UnbilledChargesHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (UnbilledChargesHandling enumValue : UnbilledChargesHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum InvoiceDunningHandling {
-    CONTINUE("continue"),
-
-    STOP("stop"),
-
-    /**
-     * An enum member indicating that InvoiceDunningHandling was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    InvoiceDunningHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static InvoiceDunningHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (InvoiceDunningHandling enumValue : InvoiceDunningHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionReactivateParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionReactivateParams.java
deleted file mode 100644
index 3c70417e..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionReactivateParams.java
+++ /dev/null
@@ -1,466 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class SubscriptionReactivateParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionReactivateParams(SubscriptionReactivateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionReactivateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionReactivateBuilder builder() {
-    return new SubscriptionReactivateBuilder();
-  }
-
-  public static final class SubscriptionReactivateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionReactivateBuilder() {}
-
-    public SubscriptionReactivateBuilder trialEnd(Timestamp value) {
-
-      formData.put("trial_end", value);
-
-      return this;
-    }
-
-    public SubscriptionReactivateBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionReactivateBuilder trialPeriodDays(Integer value) {
-
-      formData.put("trial_period_days", value);
-
-      return this;
-    }
-
-    public SubscriptionReactivateBuilder reactivateFrom(Timestamp value) {
-
-      formData.put("reactivate_from", value);
-
-      return this;
-    }
-
-    public SubscriptionReactivateBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public SubscriptionReactivateBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public SubscriptionReactivateBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public SubscriptionReactivateBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public SubscriptionReactivateBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-      formData.put("contract_term_billing_cycle_on_renewal", value);
-
-      return this;
-    }
-
-    public SubscriptionReactivateBuilder paymentInitiator(PaymentInitiator value) {
-
-      formData.put("payment_initiator", value);
-
-      return this;
-    }
-
-    public SubscriptionReactivateBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionReactivateBuilder statementDescriptor(StatementDescriptorParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionReactivateBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionReactivateParams build() {
-      return new SubscriptionReactivateParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PaymentInitiator {
-    CUSTOMER("customer"),
-
-    MERCHANT("merchant"),
-
-    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentInitiator(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentInitiator fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatementDescriptorParams {
-
-    private final Map<String, Object> formData;
-
-    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatementDescriptorParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatementDescriptorBuilder builder() {
-      return new StatementDescriptorBuilder();
-    }
-
-    public static final class StatementDescriptorBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatementDescriptorBuilder() {}
-
-      public StatementDescriptorBuilder descriptor(String value) {
-
-        formData.put("descriptor", value);
-
-        return this;
-      }
-
-      public StatementDescriptorParams build() {
-        return new StatementDescriptorParams(this);
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRegenerateInvoiceParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRegenerateInvoiceParams.java
deleted file mode 100644
index 98b707f3..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRegenerateInvoiceParams.java
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class SubscriptionRegenerateInvoiceParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionRegenerateInvoiceParams(SubscriptionRegenerateInvoiceBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionRegenerateInvoiceParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionRegenerateInvoiceBuilder builder() {
-    return new SubscriptionRegenerateInvoiceBuilder();
-  }
-
-  public static final class SubscriptionRegenerateInvoiceBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionRegenerateInvoiceBuilder() {}
-
-    public SubscriptionRegenerateInvoiceBuilder dateFrom(Timestamp value) {
-
-      formData.put("date_from", value);
-
-      return this;
-    }
-
-    public SubscriptionRegenerateInvoiceBuilder dateTo(Timestamp value) {
-
-      formData.put("date_to", value);
-
-      return this;
-    }
-
-    public SubscriptionRegenerateInvoiceBuilder prorate(Boolean value) {
-
-      formData.put("prorate", value);
-
-      return this;
-    }
-
-    public SubscriptionRegenerateInvoiceBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public SubscriptionRegenerateInvoiceParams build() {
-      return new SubscriptionRegenerateInvoiceParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveAdvanceInvoiceScheduleParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveAdvanceInvoiceScheduleParams.java
deleted file mode 100644
index fd6739b8..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveAdvanceInvoiceScheduleParams.java
+++ /dev/null
@@ -1,99 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class SubscriptionRemoveAdvanceInvoiceScheduleParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionRemoveAdvanceInvoiceScheduleParams(
-      SubscriptionRemoveAdvanceInvoiceScheduleBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionRemoveAdvanceInvoiceScheduleParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionRemoveAdvanceInvoiceScheduleBuilder builder() {
-    return new SubscriptionRemoveAdvanceInvoiceScheduleBuilder();
-  }
-
-  public static final class SubscriptionRemoveAdvanceInvoiceScheduleBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionRemoveAdvanceInvoiceScheduleBuilder() {}
-
-    public SubscriptionRemoveAdvanceInvoiceScheduleBuilder specificDatesSchedule(
-        List<SpecificDatesScheduleParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SpecificDatesScheduleParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "specific_dates_schedule[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionRemoveAdvanceInvoiceScheduleParams build() {
-      return new SubscriptionRemoveAdvanceInvoiceScheduleParams(this);
-    }
-  }
-
-  public static final class SpecificDatesScheduleParams {
-
-    private final Map<String, Object> formData;
-
-    private SpecificDatesScheduleParams(SpecificDatesScheduleBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SpecificDatesScheduleParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SpecificDatesScheduleBuilder builder() {
-      return new SpecificDatesScheduleBuilder();
-    }
-
-    public static final class SpecificDatesScheduleBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SpecificDatesScheduleBuilder() {}
-
-      public SpecificDatesScheduleBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public SpecificDatesScheduleParams build() {
-        return new SpecificDatesScheduleParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveCouponsParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveCouponsParams.java
deleted file mode 100644
index 3459da5f..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveCouponsParams.java
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class SubscriptionRemoveCouponsParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionRemoveCouponsParams(SubscriptionRemoveCouponsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionRemoveCouponsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionRemoveCouponsBuilder builder() {
-    return new SubscriptionRemoveCouponsBuilder();
-  }
-
-  public static final class SubscriptionRemoveCouponsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionRemoveCouponsBuilder() {}
-
-    public SubscriptionRemoveCouponsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public SubscriptionRemoveCouponsParams build() {
-      return new SubscriptionRemoveCouponsParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveScheduledCancellationParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveScheduledCancellationParams.java
deleted file mode 100644
index a7cb98b0..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveScheduledCancellationParams.java
+++ /dev/null
@@ -1,144 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class SubscriptionRemoveScheduledCancellationParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionRemoveScheduledCancellationParams(
-      SubscriptionRemoveScheduledCancellationBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionRemoveScheduledCancellationParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionRemoveScheduledCancellationBuilder builder() {
-    return new SubscriptionRemoveScheduledCancellationBuilder();
-  }
-
-  public static final class SubscriptionRemoveScheduledCancellationBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionRemoveScheduledCancellationBuilder() {}
-
-    public SubscriptionRemoveScheduledCancellationBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    public SubscriptionRemoveScheduledCancellationBuilder contractTermBillingCycleOnRenewal(
-        Integer value) {
-
-      formData.put("contract_term_billing_cycle_on_renewal", value);
-
-      return this;
-    }
-
-    public SubscriptionRemoveScheduledCancellationBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionRemoveScheduledCancellationParams build() {
-      return new SubscriptionRemoveScheduledCancellationParams(this);
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionResumeParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionResumeParams.java
deleted file mode 100644
index d6f74168..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionResumeParams.java
+++ /dev/null
@@ -1,353 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class SubscriptionResumeParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionResumeParams(SubscriptionResumeBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionResumeParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionResumeBuilder builder() {
-    return new SubscriptionResumeBuilder();
-  }
-
-  public static final class SubscriptionResumeBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionResumeBuilder() {}
-
-    public SubscriptionResumeBuilder resumeOption(ResumeOption value) {
-
-      formData.put("resume_option", value);
-
-      return this;
-    }
-
-    public SubscriptionResumeBuilder resumeDate(Timestamp value) {
-
-      formData.put("resume_date", value);
-
-      return this;
-    }
-
-    public SubscriptionResumeBuilder chargesHandling(ChargesHandling value) {
-
-      formData.put("charges_handling", value);
-
-      return this;
-    }
-
-    public SubscriptionResumeBuilder unpaidInvoicesHandling(UnpaidInvoicesHandling value) {
-
-      formData.put("unpaid_invoices_handling", value);
-
-      return this;
-    }
-
-    public SubscriptionResumeBuilder paymentInitiator(PaymentInitiator value) {
-
-      formData.put("payment_initiator", value);
-
-      return this;
-    }
-
-    public SubscriptionResumeBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionResumeParams build() {
-      return new SubscriptionResumeParams(this);
-    }
-  }
-
-  public enum ResumeOption {
-    IMMEDIATELY("immediately"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    /** An enum member indicating that ResumeOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ResumeOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ResumeOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ResumeOption enumValue : ResumeOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChargesHandling {
-    INVOICE_IMMEDIATELY("invoice_immediately"),
-
-    ADD_TO_UNBILLED_CHARGES("add_to_unbilled_charges"),
-
-    /** An enum member indicating that ChargesHandling was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChargesHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChargesHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChargesHandling enumValue : ChargesHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum UnpaidInvoicesHandling {
-    NO_ACTION("no_action"),
-
-    SCHEDULE_PAYMENT_COLLECTION("schedule_payment_collection"),
-
-    /**
-     * An enum member indicating that UnpaidInvoicesHandling was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    UnpaidInvoicesHandling(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static UnpaidInvoicesHandling fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (UnpaidInvoicesHandling enumValue : UnpaidInvoicesHandling.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PaymentInitiator {
-    CUSTOMER("customer"),
-
-    MERCHANT("merchant"),
-
-    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentInitiator(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentInitiator fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionSubscriptionsForCustomerParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionSubscriptionsForCustomerParams.java
deleted file mode 100644
index 6d4879b7..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionSubscriptionsForCustomerParams.java
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class SubscriptionSubscriptionsForCustomerParams {
-
-  private final Map<String, Object> queryParams;
-
-  private SubscriptionSubscriptionsForCustomerParams(
-      SubscriptionSubscriptionsForCustomerBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public SubscriptionSubscriptionsForCustomerBuilder toBuilder() {
-    SubscriptionSubscriptionsForCustomerBuilder builder =
-        new SubscriptionSubscriptionsForCustomerBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for SubscriptionSubscriptionsForCustomerParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionSubscriptionsForCustomerBuilder builder() {
-    return new SubscriptionSubscriptionsForCustomerBuilder();
-  }
-
-  public static final class SubscriptionSubscriptionsForCustomerBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private SubscriptionSubscriptionsForCustomerBuilder() {}
-
-    public SubscriptionSubscriptionsForCustomerBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public SubscriptionSubscriptionsForCustomerBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public SubscriptionSubscriptionsForCustomerParams build() {
-      return new SubscriptionSubscriptionsForCustomerParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionUpdateForItemsParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionUpdateForItemsParams.java
deleted file mode 100644
index 7ac23abd..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionUpdateForItemsParams.java
+++ /dev/null
@@ -1,2770 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class SubscriptionUpdateForItemsParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionUpdateForItemsParams(SubscriptionUpdateForItemsBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionUpdateForItemsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionUpdateForItemsBuilder builder() {
-    return new SubscriptionUpdateForItemsBuilder();
-  }
-
-  public static final class SubscriptionUpdateForItemsBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionUpdateForItemsBuilder() {}
-
-    public SubscriptionUpdateForItemsBuilder mandatoryItemsToRemove(List<String> value) {
-
-      formData.put("mandatory_items_to_remove", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder replaceItemsList(Boolean value) {
-
-      formData.put("replace_items_list", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionUpdateForItemsBuilder setupFee(Long value) {
-
-      formData.put("setup_fee", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder netTermDays(Integer value) {
-
-      formData.put("net_term_days", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder startDate(Timestamp value) {
-
-      formData.put("start_date", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder trialEnd(Timestamp value) {
-
-      formData.put("trial_end", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionUpdateForItemsBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder reactivateFrom(Timestamp value) {
-
-      formData.put("reactivate_from", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-      formData.put("offline_payment_method", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder replaceCouponList(Boolean value) {
-
-      formData.put("replace_coupon_list", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder prorate(Boolean value) {
-
-      formData.put("prorate", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder endOfTerm(Boolean value) {
-
-      formData.put("end_of_term", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder forceTermReset(Boolean value) {
-
-      formData.put("force_term_reset", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder reactivate(Boolean value) {
-
-      formData.put("reactivate", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder tokenId(String value) {
-
-      formData.put("token_id", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder overrideRelationship(Boolean value) {
-
-      formData.put("override_relationship", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder changesScheduledAt(Timestamp value) {
-
-      formData.put("changes_scheduled_at", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder changeOption(ChangeOption value) {
-
-      formData.put("change_option", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-      formData.put("contract_term_billing_cycle_on_renewal", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder freePeriod(Integer value) {
-
-      formData.put("free_period", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder freePeriodUnit(FreePeriodUnit value) {
-
-      formData.put("free_period_unit", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder createPendingInvoices(Boolean value) {
-
-      formData.put("create_pending_invoices", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder autoCloseInvoices(Boolean value) {
-
-      formData.put("auto_close_invoices", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder trialEndAction(TrialEndAction value) {
-
-      formData.put("trial_end_action", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder paymentInitiator(PaymentInitiator value) {
-
-      formData.put("payment_initiator", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder invoiceUsages(Boolean value) {
-
-      formData.put("invoice_usages", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder paymentMethod(PaymentMethodParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_method[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder statementDescriptor(StatementDescriptorParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder billingOverride(BillingOverrideParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_override[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder subscriptionItems(
-        List<SubscriptionItemsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionItemsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder discounts(List<DiscountsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          DiscountsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionUpdateForItemsBuilder coupons(List<CouponsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public SubscriptionUpdateForItemsBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public SubscriptionUpdateForItemsBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateForItemsParams build() {
-      return new SubscriptionUpdateForItemsParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum OfflinePaymentMethod {
-    NO_PREFERENCE("no_preference"),
-
-    CASH("cash"),
-
-    CHECK("check"),
-
-    BANK_TRANSFER("bank_transfer"),
-
-    ACH_CREDIT("ach_credit"),
-
-    SEPA_CREDIT("sepa_credit"),
-
-    BOLETO("boleto"),
-
-    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-    CUSTOM("custom"),
-
-    /**
-     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    OfflinePaymentMethod(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static OfflinePaymentMethod fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChangeOption {
-    IMMEDIATELY("immediately"),
-
-    END_OF_TERM("end_of_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChangeOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChangeOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChangeOption enumValue : ChangeOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum FreePeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    FreePeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static FreePeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TrialEndAction {
-    SITE_DEFAULT("site_default"),
-
-    PLAN_DEFAULT("plan_default"),
-
-    ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-    CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TrialEndAction(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TrialEndAction fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TrialEndAction enumValue : TrialEndAction.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum PaymentInitiator {
-    CUSTOMER("customer"),
-
-    MERCHANT("merchant"),
-
-    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentInitiator(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentInitiator fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CardBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public CardBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CardBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CardBuilder number(String value) {
-
-        formData.put("number", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryMonth(Integer value) {
-
-        formData.put("expiry_month", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryYear(Integer value) {
-
-        formData.put("expiry_year", value);
-
-        return this;
-      }
-
-      public CardBuilder cvv(String value) {
-
-        formData.put("cvv", value);
-
-        return this;
-      }
-
-      public CardBuilder preferredScheme(PreferredScheme value) {
-
-        formData.put("preferred_scheme", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr1(String value) {
-
-        formData.put("billing_addr1", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr2(String value) {
-
-        formData.put("billing_addr2", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCity(String value) {
-
-        formData.put("billing_city", value);
-
-        return this;
-      }
-
-      public CardBuilder billingStateCode(String value) {
-
-        formData.put("billing_state_code", value);
-
-        return this;
-      }
-
-      public CardBuilder billingState(String value) {
-
-        formData.put("billing_state", value);
-
-        return this;
-      }
-
-      public CardBuilder billingZip(String value) {
-
-        formData.put("billing_zip", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCountry(String value) {
-
-        formData.put("billing_country", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CardBuilder ipAddress(String value) {
-
-        formData.put("ip_address", value);
-
-        return this;
-      }
-
-      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PreferredScheme {
-      CARTES_BANCAIRES("cartes_bancaires"),
-
-      MASTERCARD("mastercard"),
-
-      VISA("visa"),
-
-      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PreferredScheme(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PreferredScheme fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PreferredScheme enumValue : PreferredScheme.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentMethodParams(PaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentMethodBuilder builder() {
-      return new PaymentMethodBuilder();
-    }
-
-    public static final class PaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentMethodBuilder() {}
-
-      public PaymentMethodBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentMethodBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder issuingCountry(String value) {
-
-        formData.put("issuing_country", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentMethodParams build() {
-        return new PaymentMethodParams(this);
-      }
-    }
-
-    public enum Type {
-      CARD("card"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      GENERIC("generic"),
-
-      ALIPAY("alipay"),
-
-      UNIONPAY("unionpay"),
-
-      APPLE_PAY("apple_pay"),
-
-      WECHAT_PAY("wechat_pay"),
-
-      IDEAL("ideal"),
-
-      GOOGLE_PAY("google_pay"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GIROPAY("giropay"),
-
-      DOTPAY("dotpay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      VENMO("venmo"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      GOCARDLESS("gocardless"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatementDescriptorParams {
-
-    private final Map<String, Object> formData;
-
-    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatementDescriptorParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatementDescriptorBuilder builder() {
-      return new StatementDescriptorBuilder();
-    }
-
-    public static final class StatementDescriptorBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatementDescriptorBuilder() {}
-
-      public StatementDescriptorBuilder descriptor(String value) {
-
-        formData.put("descriptor", value);
-
-        return this;
-      }
-
-      public StatementDescriptorParams build() {
-        return new StatementDescriptorParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityIdentifierScheme(String value) {
-
-        formData.put("entity_identifier_scheme", value);
-
-        return this;
-      }
-
-      public CustomerBuilder isEinvoiceEnabled(Boolean value) {
-
-        formData.put("is_einvoice_enabled", value);
-
-        return this;
-      }
-
-      public CustomerBuilder einvoicingMethod(EinvoicingMethod value) {
-
-        formData.put("einvoicing_method", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityIdentifierStandard(String value) {
-
-        formData.put("entity_identifier_standard", value);
-
-        return this;
-      }
-
-      public CustomerBuilder businessCustomerWithoutVatNumber(Boolean value) {
-
-        formData.put("business_customer_without_vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder registeredForGst(Boolean value) {
-
-        formData.put("registered_for_gst", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-
-    public enum EinvoicingMethod {
-      AUTOMATIC("automatic"),
-
-      MANUAL("manual"),
-
-      SITE_DEFAULT("site_default"),
-
-      /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EinvoicingMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EinvoicingMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public ContractTermBuilder contractStart(Timestamp value) {
-
-        formData.put("contract_start", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingOverrideParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingOverrideParams(BillingOverrideBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingOverrideParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingOverrideBuilder builder() {
-      return new BillingOverrideBuilder();
-    }
-
-    public static final class BillingOverrideBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingOverrideBuilder() {}
-
-      public BillingOverrideBuilder maxExcessPaymentUsage(Long value) {
-
-        formData.put("max_excess_payment_usage", value);
-
-        return this;
-      }
-
-      public BillingOverrideBuilder maxRefundableCreditsUsage(Long value) {
-
-        formData.put("max_refundable_credits_usage", value);
-
-        return this;
-      }
-
-      public BillingOverrideParams build() {
-        return new BillingOverrideParams(this);
-      }
-    }
-  }
-
-  public static final class SubscriptionItemsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionItemsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionItemsBuilder builder() {
-      return new SubscriptionItemsBuilder();
-    }
-
-    public static final class SubscriptionItemsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionItemsBuilder() {}
-
-      public SubscriptionItemsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
-
-        formData.put("service_period_days", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
-
-        formData.put("charge_on_event", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
-
-        formData.put("charge_on_option", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder itemType(ItemType value) {
-
-        formData.put("item_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder prorationType(ProrationType value) {
-
-        formData.put("proration_type", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsBuilder usageAccumulationResetFrequency(
-          UsageAccumulationResetFrequency value) {
-
-        formData.put("usage_accumulation_reset_frequency", value);
-
-        return this;
-      }
-
-      public SubscriptionItemsParams build() {
-        return new SubscriptionItemsParams(this);
-      }
-    }
-
-    public enum ChargeOnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ChargeOnOption {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOnOption(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOnOption fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ItemType {
-      PLAN("plan"),
-
-      ADDON("addon"),
-
-      CHARGE("charge"),
-
-      /** An enum member indicating that ItemType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ItemType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ItemType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ItemType enumValue : ItemType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum ProrationType {
-      FULL_TERM("full_term"),
-
-      PARTIAL_TERM("partial_term"),
-
-      NONE("none"),
-
-      /** An enum member indicating that ProrationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ProrationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ProrationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ProrationType enumValue : ProrationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum UsageAccumulationResetFrequency {
-      NEVER("never"),
-
-      SUBSCRIPTION_BILLING_FREQUENCY("subscription_billing_frequency"),
-
-      /**
-       * An enum member indicating that UsageAccumulationResetFrequency was instantiated with an
-       * unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      UsageAccumulationResetFrequency(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static UsageAccumulationResetFrequency fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (UsageAccumulationResetFrequency enumValue : UsageAccumulationResetFrequency.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class DiscountsParams {
-
-    private final Map<String, Object> formData;
-
-    private DiscountsParams(DiscountsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for DiscountsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static DiscountsBuilder builder() {
-      return new DiscountsBuilder();
-    }
-
-    public static final class DiscountsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private DiscountsBuilder() {}
-
-      public DiscountsBuilder applyOn(ApplyOn value) {
-
-        formData.put("apply_on", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder durationType(DurationType value) {
-
-        formData.put("duration_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder percentage(Number value) {
-
-        formData.put("percentage", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder period(Integer value) {
-
-        formData.put("period", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder periodUnit(PeriodUnit value) {
-
-        formData.put("period_unit", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder includedInMrr(Boolean value) {
-
-        formData.put("included_in_mrr", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder operationType(OperationType value) {
-
-        formData.put("operation_type", value);
-
-        return this;
-      }
-
-      public DiscountsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public DiscountsParams build() {
-        return new DiscountsParams(this);
-      }
-    }
-
-    public enum ApplyOn {
-      INVOICE_AMOUNT("invoice_amount"),
-
-      SPECIFIC_ITEM_PRICE("specific_item_price"),
-
-      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ApplyOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ApplyOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ApplyOn enumValue : ApplyOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum DurationType {
-      ONE_TIME("one_time"),
-
-      FOREVER("forever"),
-
-      LIMITED_PERIOD("limited_period"),
-
-      /** An enum member indicating that DurationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      DurationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static DurationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (DurationType enumValue : DurationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PeriodUnit {
-      DAY("day"),
-
-      WEEK("week"),
-
-      MONTH("month"),
-
-      YEAR("year"),
-
-      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PeriodUnit(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PeriodUnit fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PeriodUnit enumValue : PeriodUnit.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OperationType {
-      ADD("add"),
-
-      REMOVE("remove"),
-
-      /** An enum member indicating that OperationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OperationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OperationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OperationType enumValue : OperationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsParams(CouponsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsBuilder builder() {
-      return new CouponsBuilder();
-    }
-
-    public static final class CouponsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsBuilder() {}
-
-      public CouponsBuilder couponId(String value) {
-
-        formData.put("coupon_id", value);
-
-        return this;
-      }
-
-      public CouponsBuilder applyTill(Timestamp value) {
-
-        formData.put("apply_till", value);
-
-        return this;
-      }
-
-      public CouponsParams build() {
-        return new CouponsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionUpdateParams.java
deleted file mode 100644
index 951302b2..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionUpdateParams.java
+++ /dev/null
@@ -1,2302 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscription.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class SubscriptionUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionUpdateParams(SubscriptionUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for SubscriptionUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionUpdateBuilder builder() {
-    return new SubscriptionUpdateBuilder();
-  }
-
-  public static final class SubscriptionUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionUpdateBuilder() {}
-
-    public SubscriptionUpdateBuilder planId(String value) {
-
-      formData.put("plan_id", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder planQuantity(Integer value) {
-
-      formData.put("plan_quantity", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder planUnitPrice(Long value) {
-
-      formData.put("plan_unit_price", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder setupFee(Long value) {
-
-      formData.put("setup_fee", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder replaceAddonList(Boolean value) {
-
-      formData.put("replace_addon_list", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder mandatoryAddonsToRemove(List<String> value) {
-
-      formData.put("mandatory_addons_to_remove", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder planQuantityInDecimal(String value) {
-
-      formData.put("plan_quantity_in_decimal", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder planUnitPriceInDecimal(String value) {
-
-      formData.put("plan_unit_price_in_decimal", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder invoiceDate(Timestamp value) {
-
-      formData.put("invoice_date", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder startDate(Timestamp value) {
-
-      formData.put("start_date", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder trialEnd(Timestamp value) {
-
-      formData.put("trial_end", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder billingCycles(Integer value) {
-
-      formData.put("billing_cycles", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionUpdateBuilder coupon(String value) {
-
-      formData.put("coupon", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder termsToCharge(Integer value) {
-
-      formData.put("terms_to_charge", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder reactivateFrom(Timestamp value) {
-
-      formData.put("reactivate_from", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder billingAlignmentMode(BillingAlignmentMode value) {
-
-      formData.put("billing_alignment_mode", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder autoCollection(AutoCollection value) {
-
-      formData.put("auto_collection", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
-
-      formData.put("offline_payment_method", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder poNumber(String value) {
-
-      formData.put("po_number", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder couponIds(List<String> value) {
-
-      formData.put("coupon_ids", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder replaceCouponList(Boolean value) {
-
-      formData.put("replace_coupon_list", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder prorate(Boolean value) {
-
-      formData.put("prorate", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder endOfTerm(Boolean value) {
-
-      formData.put("end_of_term", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder forceTermReset(Boolean value) {
-
-      formData.put("force_term_reset", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder reactivate(Boolean value) {
-
-      formData.put("reactivate", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder tokenId(String value) {
-
-      formData.put("token_id", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder invoiceNotes(String value) {
-
-      formData.put("invoice_notes", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder metaData(java.util.Map<String, Object> value) {
-
-      formData.put("meta_data", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder invoiceImmediately(Boolean value) {
-
-      formData.put("invoice_immediately", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder overrideRelationship(Boolean value) {
-
-      formData.put("override_relationship", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder changesScheduledAt(Timestamp value) {
-
-      formData.put("changes_scheduled_at", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder changeOption(ChangeOption value) {
-
-      formData.put("change_option", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder contractTermBillingCycleOnRenewal(Integer value) {
-
-      formData.put("contract_term_billing_cycle_on_renewal", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder freePeriod(Integer value) {
-
-      formData.put("free_period", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder freePeriodUnit(FreePeriodUnit value) {
-
-      formData.put("free_period_unit", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder trialEndAction(TrialEndAction value) {
-
-      formData.put("trial_end_action", value);
-
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder card(CardParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "card[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder paymentMethod(PaymentMethodParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_method[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder paymentIntent(PaymentIntentParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "payment_intent[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder billingAddress(BillingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "billing_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder shippingAddress(ShippingAddressParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "shipping_address[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder statementDescriptor(StatementDescriptorParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder customer(CustomerParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "customer[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder contractTerm(ContractTermParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "contract_term[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventBasedAddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionUpdateBuilder coupons(List<CouponsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          CouponsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    /**
-     * Add a custom field to the request. Custom fields must start with "cf_".
-     *
-     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
-     * @param value the value of the custom field
-     * @return this builder
-     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
-     */
-    public SubscriptionUpdateBuilder customField(String fieldName, Object value) {
-      if (fieldName == null || !fieldName.startsWith("cf_")) {
-        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
-      }
-      formData.put(fieldName, value);
-      return this;
-    }
-
-    /**
-     * Add multiple custom fields to the request. All field names must start with "cf_".
-     *
-     * @param customFields map of custom field names to values
-     * @return this builder
-     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
-     */
-    public SubscriptionUpdateBuilder customFields(Map<String, Object> customFields) {
-      if (customFields != null) {
-        for (Map.Entry<String, Object> entry : customFields.entrySet()) {
-          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
-            throw new IllegalArgumentException(
-                "Custom field name must start with 'cf_': " + entry.getKey());
-          }
-          formData.put(entry.getKey(), entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionUpdateParams build() {
-      return new SubscriptionUpdateParams(this);
-    }
-  }
-
-  public enum BillingAlignmentMode {
-    IMMEDIATE("immediate"),
-
-    DELAYED("delayed"),
-
-    /**
-     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    BillingAlignmentMode(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static BillingAlignmentMode fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum AutoCollection {
-    ON("on"),
-
-    OFF("off"),
-
-    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    AutoCollection(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static AutoCollection fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (AutoCollection enumValue : AutoCollection.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum OfflinePaymentMethod {
-    NO_PREFERENCE("no_preference"),
-
-    CASH("cash"),
-
-    CHECK("check"),
-
-    BANK_TRANSFER("bank_transfer"),
-
-    ACH_CREDIT("ach_credit"),
-
-    SEPA_CREDIT("sepa_credit"),
-
-    BOLETO("boleto"),
-
-    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
-
-    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-    CUSTOM("custom"),
-
-    /**
-     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    OfflinePaymentMethod(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static OfflinePaymentMethod fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChangeOption {
-    IMMEDIATELY("immediately"),
-
-    END_OF_TERM("end_of_term"),
-
-    SPECIFIC_DATE("specific_date"),
-
-    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChangeOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChangeOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChangeOption enumValue : ChangeOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum FreePeriodUnit {
-    DAY("day"),
-
-    WEEK("week"),
-
-    MONTH("month"),
-
-    YEAR("year"),
-
-    /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    FreePeriodUnit(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static FreePeriodUnit fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum TrialEndAction {
-    SITE_DEFAULT("site_default"),
-
-    PLAN_DEFAULT("plan_default"),
-
-    ACTIVATE_SUBSCRIPTION("activate_subscription"),
-
-    CANCEL_SUBSCRIPTION("cancel_subscription"),
-
-    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    TrialEndAction(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static TrialEndAction fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (TrialEndAction enumValue : TrialEndAction.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class CardParams {
-
-    private final Map<String, Object> formData;
-
-    private CardParams(CardBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CardParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CardBuilder builder() {
-      return new CardBuilder();
-    }
-
-    public static final class CardBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CardBuilder() {}
-
-      @Deprecated
-      public CardBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public CardBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CardBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public CardBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public CardBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public CardBuilder number(String value) {
-
-        formData.put("number", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryMonth(Integer value) {
-
-        formData.put("expiry_month", value);
-
-        return this;
-      }
-
-      public CardBuilder expiryYear(Integer value) {
-
-        formData.put("expiry_year", value);
-
-        return this;
-      }
-
-      public CardBuilder cvv(String value) {
-
-        formData.put("cvv", value);
-
-        return this;
-      }
-
-      public CardBuilder preferredScheme(PreferredScheme value) {
-
-        formData.put("preferred_scheme", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr1(String value) {
-
-        formData.put("billing_addr1", value);
-
-        return this;
-      }
-
-      public CardBuilder billingAddr2(String value) {
-
-        formData.put("billing_addr2", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCity(String value) {
-
-        formData.put("billing_city", value);
-
-        return this;
-      }
-
-      public CardBuilder billingStateCode(String value) {
-
-        formData.put("billing_state_code", value);
-
-        return this;
-      }
-
-      public CardBuilder billingState(String value) {
-
-        formData.put("billing_state", value);
-
-        return this;
-      }
-
-      public CardBuilder billingZip(String value) {
-
-        formData.put("billing_zip", value);
-
-        return this;
-      }
-
-      public CardBuilder billingCountry(String value) {
-
-        formData.put("billing_country", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public CardBuilder ipAddress(String value) {
-
-        formData.put("ip_address", value);
-
-        return this;
-      }
-
-      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public CardParams build() {
-        return new CardParams(this);
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE("chargebee"),
-
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum PreferredScheme {
-      CARTES_BANCAIRES("cartes_bancaires"),
-
-      MASTERCARD("mastercard"),
-
-      VISA("visa"),
-
-      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PreferredScheme(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PreferredScheme fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PreferredScheme enumValue : PreferredScheme.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentMethodParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentMethodParams(PaymentMethodBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentMethodParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentMethodBuilder builder() {
-      return new PaymentMethodBuilder();
-    }
-
-    public static final class PaymentMethodBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentMethodBuilder() {}
-
-      public PaymentMethodBuilder type(Type value) {
-
-        formData.put("type", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentMethodBuilder gateway(Gateway value) {
-
-        formData.put("gateway", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder tmpToken(String value) {
-
-        formData.put("tmp_token", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder issuingCountry(String value) {
-
-        formData.put("issuing_country", value);
-
-        return this;
-      }
-
-      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentMethodParams build() {
-        return new PaymentMethodParams(this);
-      }
-    }
-
-    public enum Type {
-      CARD("card"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      GENERIC("generic"),
-
-      ALIPAY("alipay"),
-
-      UNIONPAY("unionpay"),
-
-      APPLE_PAY("apple_pay"),
-
-      WECHAT_PAY("wechat_pay"),
-
-      IDEAL("ideal"),
-
-      GOOGLE_PAY("google_pay"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GIROPAY("giropay"),
-
-      DOTPAY("dotpay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      VENMO("venmo"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /** An enum member indicating that Type was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Type(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Type fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Type enumValue : Type.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum Gateway {
-      CHARGEBEE_PAYMENTS("chargebee_payments"),
-
-      ADYEN("adyen"),
-
-      STRIPE("stripe"),
-
-      WEPAY("wepay"),
-
-      BRAINTREE("braintree"),
-
-      AUTHORIZE_NET("authorize_net"),
-
-      PAYPAL_PRO("paypal_pro"),
-
-      PIN("pin"),
-
-      EWAY("eway"),
-
-      EWAY_RAPID("eway_rapid"),
-
-      WORLDPAY("worldpay"),
-
-      BALANCED_PAYMENTS("balanced_payments"),
-
-      BEANSTREAM("beanstream"),
-
-      BLUEPAY("bluepay"),
-
-      ELAVON("elavon"),
-
-      FIRST_DATA_GLOBAL("first_data_global"),
-
-      HDFC("hdfc"),
-
-      MIGS("migs"),
-
-      NMI("nmi"),
-
-      OGONE("ogone"),
-
-      PAYMILL("paymill"),
-
-      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
-
-      SAGE_PAY("sage_pay"),
-
-      TCO("tco"),
-
-      WIRECARD("wirecard"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      GOCARDLESS("gocardless"),
-
-      ORBITAL("orbital"),
-
-      MONERIS_US("moneris_us"),
-
-      MONERIS("moneris"),
-
-      BLUESNAP("bluesnap"),
-
-      CYBERSOURCE("cybersource"),
-
-      VANTIV("vantiv"),
-
-      CHECKOUT_COM("checkout_com"),
-
-      PAYPAL("paypal"),
-
-      INGENICO_DIRECT("ingenico_direct"),
-
-      EXACT("exact"),
-
-      MOLLIE("mollie"),
-
-      QUICKBOOKS("quickbooks"),
-
-      RAZORPAY("razorpay"),
-
-      GLOBAL_PAYMENTS("global_payments"),
-
-      BANK_OF_AMERICA("bank_of_america"),
-
-      ECENTRIC("ecentric"),
-
-      METRICS_GLOBAL("metrics_global"),
-
-      WINDCAVE("windcave"),
-
-      PAY_COM("pay_com"),
-
-      EBANX("ebanx"),
-
-      DLOCAL("dlocal"),
-
-      NUVEI("nuvei"),
-
-      SOLIDGATE("solidgate"),
-
-      PAYSTACK("paystack"),
-
-      JP_MORGAN("jp_morgan"),
-
-      DEUTSCHE_BANK("deutsche_bank"),
-
-      /** An enum member indicating that Gateway was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      Gateway(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static Gateway fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (Gateway enumValue : Gateway.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class PaymentIntentParams {
-
-    private final Map<String, Object> formData;
-
-    private PaymentIntentParams(PaymentIntentBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for PaymentIntentParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static PaymentIntentBuilder builder() {
-      return new PaymentIntentBuilder();
-    }
-
-    public static final class PaymentIntentBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private PaymentIntentBuilder() {}
-
-      public PaymentIntentBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gatewayAccountId(String value) {
-
-        formData.put("gateway_account_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder gwToken(String value) {
-
-        formData.put("gw_token", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
-
-        formData.put("payment_method_type", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder referenceId(String value) {
-
-        formData.put("reference_id", value);
-
-        return this;
-      }
-
-      @Deprecated
-      public PaymentIntentBuilder gwPaymentMethodId(String value) {
-
-        formData.put("gw_payment_method_id", value);
-
-        return this;
-      }
-
-      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
-
-        formData.put("additional_information", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public PaymentIntentParams build() {
-        return new PaymentIntentParams(this);
-      }
-    }
-
-    public enum PaymentMethodType {
-      CARD("card"),
-
-      IDEAL("ideal"),
-
-      SOFORT("sofort"),
-
-      BANCONTACT("bancontact"),
-
-      GOOGLE_PAY("google_pay"),
-
-      DOTPAY("dotpay"),
-
-      GIROPAY("giropay"),
-
-      APPLE_PAY("apple_pay"),
-
-      UPI("upi"),
-
-      NETBANKING_EMANDATES("netbanking_emandates"),
-
-      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
-
-      DIRECT_DEBIT("direct_debit"),
-
-      BOLETO("boleto"),
-
-      VENMO("venmo"),
-
-      AMAZON_PAYMENTS("amazon_payments"),
-
-      PAY_TO("pay_to"),
-
-      FASTER_PAYMENTS("faster_payments"),
-
-      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
-
-      KLARNA_PAY_NOW("klarna_pay_now"),
-
-      ONLINE_BANKING_POLAND("online_banking_poland"),
-
-      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
-
-      /**
-       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
-       */
-      _UNKNOWN(null);
-      private final String value;
-
-      PaymentMethodType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PaymentMethodType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class BillingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private BillingAddressParams(BillingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for BillingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static BillingAddressBuilder builder() {
-      return new BillingAddressBuilder();
-    }
-
-    public static final class BillingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private BillingAddressBuilder() {}
-
-      public BillingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public BillingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public BillingAddressParams build() {
-        return new BillingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ShippingAddressParams {
-
-    private final Map<String, Object> formData;
-
-    private ShippingAddressParams(ShippingAddressBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ShippingAddressParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ShippingAddressBuilder builder() {
-      return new ShippingAddressBuilder();
-    }
-
-    public static final class ShippingAddressBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ShippingAddressBuilder() {}
-
-      public ShippingAddressBuilder firstName(String value) {
-
-        formData.put("first_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder lastName(String value) {
-
-        formData.put("last_name", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder email(String value) {
-
-        formData.put("email", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder company(String value) {
-
-        formData.put("company", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder phone(String value) {
-
-        formData.put("phone", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line1(String value) {
-
-        formData.put("line1", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line2(String value) {
-
-        formData.put("line2", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder line3(String value) {
-
-        formData.put("line3", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder city(String value) {
-
-        formData.put("city", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder stateCode(String value) {
-
-        formData.put("state_code", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder state(String value) {
-
-        formData.put("state", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder zip(String value) {
-
-        formData.put("zip", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder country(String value) {
-
-        formData.put("country", value);
-
-        return this;
-      }
-
-      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
-
-        formData.put("validation_status", value);
-
-        return this;
-      }
-
-      public ShippingAddressParams build() {
-        return new ShippingAddressParams(this);
-      }
-    }
-
-    public enum ValidationStatus {
-      NOT_VALIDATED("not_validated"),
-
-      VALID("valid"),
-
-      PARTIALLY_VALID("partially_valid"),
-
-      INVALID("invalid"),
-
-      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ValidationStatus(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ValidationStatus fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ValidationStatus enumValue : ValidationStatus.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class StatementDescriptorParams {
-
-    private final Map<String, Object> formData;
-
-    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for StatementDescriptorParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static StatementDescriptorBuilder builder() {
-      return new StatementDescriptorBuilder();
-    }
-
-    public static final class StatementDescriptorBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private StatementDescriptorBuilder() {}
-
-      public StatementDescriptorBuilder descriptor(String value) {
-
-        formData.put("descriptor", value);
-
-        return this;
-      }
-
-      public StatementDescriptorParams build() {
-        return new StatementDescriptorParams(this);
-      }
-    }
-  }
-
-  public static final class CustomerParams {
-
-    private final Map<String, Object> formData;
-
-    private CustomerParams(CustomerBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CustomerParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CustomerBuilder builder() {
-      return new CustomerBuilder();
-    }
-
-    public static final class CustomerBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CustomerBuilder() {}
-
-      public CustomerBuilder vatNumber(String value) {
-
-        formData.put("vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder vatNumberPrefix(String value) {
-
-        formData.put("vat_number_prefix", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityIdentifierScheme(String value) {
-
-        formData.put("entity_identifier_scheme", value);
-
-        return this;
-      }
-
-      public CustomerBuilder isEinvoiceEnabled(Boolean value) {
-
-        formData.put("is_einvoice_enabled", value);
-
-        return this;
-      }
-
-      public CustomerBuilder einvoicingMethod(EinvoicingMethod value) {
-
-        formData.put("einvoicing_method", value);
-
-        return this;
-      }
-
-      public CustomerBuilder entityIdentifierStandard(String value) {
-
-        formData.put("entity_identifier_standard", value);
-
-        return this;
-      }
-
-      public CustomerBuilder businessCustomerWithoutVatNumber(Boolean value) {
-
-        formData.put("business_customer_without_vat_number", value);
-
-        return this;
-      }
-
-      public CustomerBuilder registeredForGst(Boolean value) {
-
-        formData.put("registered_for_gst", value);
-
-        return this;
-      }
-
-      public CustomerParams build() {
-        return new CustomerParams(this);
-      }
-    }
-
-    public enum EinvoicingMethod {
-      AUTOMATIC("automatic"),
-
-      MANUAL("manual"),
-
-      SITE_DEFAULT("site_default"),
-
-      /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      EinvoicingMethod(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static EinvoicingMethod fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ContractTermParams {
-
-    private final Map<String, Object> formData;
-
-    private ContractTermParams(ContractTermBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ContractTermParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ContractTermBuilder builder() {
-      return new ContractTermBuilder();
-    }
-
-    public static final class ContractTermBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ContractTermBuilder() {}
-
-      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
-
-        formData.put("action_at_term_end", value);
-
-        return this;
-      }
-
-      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
-
-        formData.put("cancellation_cutoff_period", value);
-
-        return this;
-      }
-
-      public ContractTermParams build() {
-        return new ContractTermParams(this);
-      }
-    }
-
-    public enum ActionAtTermEnd {
-      RENEW("renew"),
-
-      EVERGREEN("evergreen"),
-
-      CANCEL("cancel"),
-
-      RENEW_ONCE("renew_once"),
-
-      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ActionAtTermEnd(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ActionAtTermEnd fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder billingCycles(Integer value) {
-
-        formData.put("billing_cycles", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder trialEnd(Timestamp value) {
-
-        formData.put("trial_end", value);
-
-        return this;
-      }
-
-      public AddonsBuilder prorationType(ProrationType value) {
-
-        formData.put("proration_type", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-
-    public enum ProrationType {
-      FULL_TERM("full_term"),
-
-      PARTIAL_TERM("partial_term"),
-
-      NONE("none"),
-
-      /** An enum member indicating that ProrationType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ProrationType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ProrationType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ProrationType enumValue : ProrationType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class EventBasedAddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventBasedAddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventBasedAddonsBuilder builder() {
-      return new EventBasedAddonsBuilder();
-    }
-
-    public static final class EventBasedAddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventBasedAddonsBuilder() {}
-
-      public EventBasedAddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
-
-        formData.put("service_period_in_days", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
-
-        formData.put("charge_on", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder onEvent(OnEvent value) {
-
-        formData.put("on_event", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
-
-        formData.put("charge_once", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public EventBasedAddonsParams build() {
-        return new EventBasedAddonsParams(this);
-      }
-    }
-
-    public enum ChargeOn {
-      IMMEDIATELY("immediately"),
-
-      ON_EVENT("on_event"),
-
-      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      ChargeOn(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static ChargeOn fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (ChargeOn enumValue : ChargeOn.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-
-    public enum OnEvent {
-      SUBSCRIPTION_CREATION("subscription_creation"),
-
-      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
-
-      PLAN_ACTIVATION("plan_activation"),
-
-      SUBSCRIPTION_ACTIVATION("subscription_activation"),
-
-      CONTRACT_TERMINATION("contract_termination"),
-
-      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      OnEvent(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static OnEvent fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (OnEvent enumValue : OnEvent.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class CouponsParams {
-
-    private final Map<String, Object> formData;
-
-    private CouponsParams(CouponsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for CouponsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static CouponsBuilder builder() {
-      return new CouponsBuilder();
-    }
-
-    public static final class CouponsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private CouponsBuilder() {}
-
-      public CouponsBuilder couponId(String value) {
-
-        formData.put("coupon_id", value);
-
-        return this;
-      }
-
-      public CouponsBuilder applyTill(Timestamp value) {
-
-        formData.put("apply_till", value);
-
-        return this;
-      }
-
-      public CouponsParams build() {
-        return new CouponsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlement/params/SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityParams.java b/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlement/params/SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityParams.java
deleted file mode 100644
index bb0c864b..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlement/params/SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityParams.java
+++ /dev/null
@@ -1,109 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.subscriptionEntitlement.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityParams {
-
-  private final Map<String, Object> formData;
-
-  private SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityParams(
-      SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /**
-   * Create a new builder for SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityParams.
-   */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityBuilder builder() {
-    return new SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityBuilder();
-  }
-
-  public static final class SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityBuilder() {}
-
-    public SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityBuilder isEnabled(
-        Boolean value) {
-
-      formData.put("is_enabled", value);
-
-      return this;
-    }
-
-    public SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityBuilder
-        subscriptionEntitlements(List<SubscriptionEntitlementsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          SubscriptionEntitlementsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "subscription_entitlements[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityParams build() {
-      return new SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityParams(this);
-    }
-  }
-
-  public static final class SubscriptionEntitlementsParams {
-
-    private final Map<String, Object> formData;
-
-    private SubscriptionEntitlementsParams(SubscriptionEntitlementsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for SubscriptionEntitlementsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static SubscriptionEntitlementsBuilder builder() {
-      return new SubscriptionEntitlementsBuilder();
-    }
-
-    public static final class SubscriptionEntitlementsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private SubscriptionEntitlementsBuilder() {}
-
-      public SubscriptionEntitlementsBuilder featureId(String value) {
-
-        formData.put("feature_id", value);
-
-        return this;
-      }
-
-      public SubscriptionEntitlementsParams build() {
-        return new SubscriptionEntitlementsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlement/params/SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlement/params/SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams.java
deleted file mode 100644
index 69ecdf3a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlement/params/SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams.java
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.subscriptionEntitlement.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams {
-
-  private final Map<String, Object> queryParams;
-
-  private SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams(
-      SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionBuilder toBuilder() {
-    SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionBuilder builder =
-        new SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /**
-   * Create a new builder for SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams.
-   */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionBuilder builder() {
-    return new SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionBuilder();
-  }
-
-  public static final class SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionBuilder() {}
-
-    public SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionBuilder limit(
-        Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionBuilder offset(
-        String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionBuilder includeDrafts(
-        Boolean value) {
-      queryParams.put("include_drafts", value);
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionBuilder embed(
-        String value) {
-      queryParams.put("embed", value);
-      return this;
-    }
-
-    @Deprecated
-    public SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionBuilder
-        includeScheduledOverrides(Boolean value) {
-      queryParams.put("include_scheduled_overrides", value);
-      return this;
-    }
-
-    public SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams build() {
-      return new SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartyConfiguration/params/ThirdPartyConfigurationUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/thirdPartyConfiguration/params/ThirdPartyConfigurationUpdateParams.java
deleted file mode 100644
index 8784afce..00000000
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartyConfiguration/params/ThirdPartyConfigurationUpdateParams.java
+++ /dev/null
@@ -1,73 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.thirdPartyConfiguration.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class ThirdPartyConfigurationUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private ThirdPartyConfigurationUpdateParams(ThirdPartyConfigurationUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ThirdPartyConfigurationUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ThirdPartyConfigurationUpdateBuilder builder() {
-    return new ThirdPartyConfigurationUpdateBuilder();
-  }
-
-  public static final class ThirdPartyConfigurationUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ThirdPartyConfigurationUpdateBuilder() {}
-
-    public ThirdPartyConfigurationUpdateBuilder integrationName(String value) {
-
-      formData.put("integration_name", value);
-
-      return this;
-    }
-
-    public ThirdPartyConfigurationUpdateBuilder configJson(java.util.Map<String, Object> value) {
-
-      formData.put("config_json", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public ThirdPartyConfigurationUpdateBuilder authJson(java.util.Map<String, Object> value) {
-
-      formData.put("auth_json", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public ThirdPartyConfigurationUpdateBuilder lastSyncAt(Timestamp value) {
-
-      formData.put("last_sync_at", value);
-
-      return this;
-    }
-
-    public ThirdPartyConfigurationUpdateParams build() {
-      return new ThirdPartyConfigurationUpdateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingUpdateEntityParams.java b/src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingUpdateEntityParams.java
deleted file mode 100644
index 58d8fa2d..00000000
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingUpdateEntityParams.java
+++ /dev/null
@@ -1,286 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.thirdPartyEntityMapping.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ThirdPartyEntityMappingUpdateEntityParams {
-
-  private final Map<String, Object> formData;
-
-  private ThirdPartyEntityMappingUpdateEntityParams(
-      ThirdPartyEntityMappingUpdateEntityBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ThirdPartyEntityMappingUpdateEntityParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ThirdPartyEntityMappingUpdateEntityBuilder builder() {
-    return new ThirdPartyEntityMappingUpdateEntityBuilder();
-  }
-
-  public static final class ThirdPartyEntityMappingUpdateEntityBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ThirdPartyEntityMappingUpdateEntityBuilder() {}
-
-    public ThirdPartyEntityMappingUpdateEntityBuilder entityType(EntityType value) {
-
-      formData.put("entity_type", value);
-
-      return this;
-    }
-
-    public ThirdPartyEntityMappingUpdateEntityBuilder entityId(String value) {
-
-      formData.put("entity_id", value);
-
-      return this;
-    }
-
-    public ThirdPartyEntityMappingUpdateEntityBuilder thirdPartyEntityId(String value) {
-
-      formData.put("third_party_entity_id", value);
-
-      return this;
-    }
-
-    public ThirdPartyEntityMappingUpdateEntityBuilder integrationName(String value) {
-
-      formData.put("integration_name", value);
-
-      return this;
-    }
-
-    public ThirdPartyEntityMappingUpdateEntityBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public ThirdPartyEntityMappingUpdateEntityBuilder oldResource(
-        java.util.Map<String, Object> value) {
-
-      formData.put("old_resource", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public ThirdPartyEntityMappingUpdateEntityBuilder mappingMeta(
-        java.util.Map<String, Object> value) {
-
-      formData.put("mapping_meta", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public ThirdPartyEntityMappingUpdateEntityBuilder failedDependentEntityId(String value) {
-
-      formData.put("failed_dependent_entity_id", value);
-
-      return this;
-    }
-
-    public ThirdPartyEntityMappingUpdateEntityBuilder failedDependentEntityType(
-        FailedDependentEntityType value) {
-
-      formData.put("failed_dependent_entity_type", value);
-
-      return this;
-    }
-
-    public ThirdPartyEntityMappingUpdateEntityBuilder errorMessage(String value) {
-
-      formData.put("error_message", value);
-
-      return this;
-    }
-
-    public ThirdPartyEntityMappingUpdateEntityBuilder url(String value) {
-
-      formData.put("url", value);
-
-      return this;
-    }
-
-    public ThirdPartyEntityMappingUpdateEntityParams build() {
-      return new ThirdPartyEntityMappingUpdateEntityParams(this);
-    }
-  }
-
-  public enum EntityType {
-    CUSTOMER("customer"),
-
-    INVOICE("invoice"),
-
-    CREDIT_NOTE("credit_note"),
-
-    TRANSACTION("transaction"),
-
-    PLAN("plan"),
-
-    ADDON("addon"),
-
-    COUPON("coupon"),
-
-    SUBSCRIPTION("subscription"),
-
-    ORDER("order"),
-
-    QUOTE("quote"),
-
-    ITEM_FAMILY("item_family"),
-
-    ITEM("item"),
-
-    ITEM_PRICE("item_price"),
-
-    TAX_RATE("tax_rate"),
-
-    TAX_GROUP("tax_group"),
-
-    /** An enum member indicating that EntityType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    EntityType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static EntityType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (EntityType enumValue : EntityType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum Status {
-    SYNCED("synced"),
-
-    PARTIALLY_SYNCED("partially_synced"),
-
-    CREATE_FAILED("create_failed"),
-
-    UPDATE_FAILED("update_failed"),
-
-    STOPPED("stopped"),
-
-    IGNORED("ignored"),
-
-    TO_BE_PICKED("to_be_picked"),
-
-    FORCE_SYNC("force_sync"),
-
-    MISMATCH("mismatch"),
-
-    DELETED("deleted"),
-
-    QUEUED("queued"),
-
-    DELETE_FAILED("delete_failed"),
-
-    DELETE_SUCCESS("delete_success"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum FailedDependentEntityType {
-    CUSTOMER("customer"),
-
-    INVOICE("invoice"),
-
-    CREDIT_NOTE("credit_note"),
-
-    TRANSACTION("transaction"),
-
-    PLAN("plan"),
-
-    ADDON("addon"),
-
-    COUPON("coupon"),
-
-    SUBSCRIPTION("subscription"),
-
-    ORDER("order"),
-
-    QUOTE("quote"),
-
-    ITEM_FAMILY("item_family"),
-
-    ITEM("item"),
-
-    ITEM_PRICE("item_price"),
-
-    TAX_RATE("tax_rate"),
-
-    TAX_GROUP("tax_group"),
-
-    /**
-     * An enum member indicating that FailedDependentEntityType was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    FailedDependentEntityType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static FailedDependentEntityType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (FailedDependentEntityType enumValue : FailedDependentEntityType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/params/ThirdPartySyncDetailCreateParams.java b/src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/params/ThirdPartySyncDetailCreateParams.java
deleted file mode 100644
index f494e447..00000000
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/params/ThirdPartySyncDetailCreateParams.java
+++ /dev/null
@@ -1,100 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.thirdPartySyncDetail.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ThirdPartySyncDetailCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private ThirdPartySyncDetailCreateParams(ThirdPartySyncDetailCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ThirdPartySyncDetailCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ThirdPartySyncDetailCreateBuilder builder() {
-    return new ThirdPartySyncDetailCreateBuilder();
-  }
-
-  public static final class ThirdPartySyncDetailCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ThirdPartySyncDetailCreateBuilder() {}
-
-    public ThirdPartySyncDetailCreateBuilder context(java.util.Map<String, Object> value) {
-
-      formData.put("context", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public ThirdPartySyncDetailCreateBuilder thirdPartyConfiguration(
-        ThirdPartyConfigurationParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "third_party_configuration[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public ThirdPartySyncDetailCreateParams build() {
-      return new ThirdPartySyncDetailCreateParams(this);
-    }
-  }
-
-  public static final class ThirdPartyConfigurationParams {
-
-    private final Map<String, Object> formData;
-
-    private ThirdPartyConfigurationParams(ThirdPartyConfigurationBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ThirdPartyConfigurationParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ThirdPartyConfigurationBuilder builder() {
-      return new ThirdPartyConfigurationBuilder();
-    }
-
-    public static final class ThirdPartyConfigurationBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ThirdPartyConfigurationBuilder() {}
-
-      public ThirdPartyConfigurationBuilder integrationName(String value) {
-
-        formData.put("integration_name", value);
-
-        return this;
-      }
-
-      public ThirdPartyConfigurationParams build() {
-        return new ThirdPartyConfigurationParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/params/ThirdPartySyncDetailUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/params/ThirdPartySyncDetailUpdateParams.java
deleted file mode 100644
index 5aa0d026..00000000
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/params/ThirdPartySyncDetailUpdateParams.java
+++ /dev/null
@@ -1,92 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.thirdPartySyncDetail.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class ThirdPartySyncDetailUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private ThirdPartySyncDetailUpdateParams(ThirdPartySyncDetailUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for ThirdPartySyncDetailUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static ThirdPartySyncDetailUpdateBuilder builder() {
-    return new ThirdPartySyncDetailUpdateBuilder();
-  }
-
-  public static final class ThirdPartySyncDetailUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private ThirdPartySyncDetailUpdateBuilder() {}
-
-    public ThirdPartySyncDetailUpdateBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public ThirdPartySyncDetailUpdateBuilder context(java.util.Map<String, Object> value) {
-
-      formData.put("context", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public ThirdPartySyncDetailUpdateParams build() {
-      return new ThirdPartySyncDetailUpdateParams(this);
-    }
-  }
-
-  public enum Status {
-    SUCCEEDED("succeeded"),
-
-    FAILED("failed"),
-
-    STARTED("started"),
-
-    RUNNING("running"),
-
-    ABORTED("aborted"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/timeMachine/params/TimeMachineStartAfreshParams.java b/src/main/java/com/chargebee/v4/core/models/timeMachine/params/TimeMachineStartAfreshParams.java
deleted file mode 100644
index 0d45c9f1..00000000
--- a/src/main/java/com/chargebee/v4/core/models/timeMachine/params/TimeMachineStartAfreshParams.java
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.timeMachine.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class TimeMachineStartAfreshParams {
-
-  private final Map<String, Object> formData;
-
-  private TimeMachineStartAfreshParams(TimeMachineStartAfreshBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for TimeMachineStartAfreshParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TimeMachineStartAfreshBuilder builder() {
-    return new TimeMachineStartAfreshBuilder();
-  }
-
-  public static final class TimeMachineStartAfreshBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private TimeMachineStartAfreshBuilder() {}
-
-    public TimeMachineStartAfreshBuilder genesisTime(Timestamp value) {
-
-      formData.put("genesis_time", value);
-
-      return this;
-    }
-
-    public TimeMachineStartAfreshParams build() {
-      return new TimeMachineStartAfreshParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/timeMachine/params/TimeMachineTravelForwardParams.java b/src/main/java/com/chargebee/v4/core/models/timeMachine/params/TimeMachineTravelForwardParams.java
deleted file mode 100644
index 7ec5c261..00000000
--- a/src/main/java/com/chargebee/v4/core/models/timeMachine/params/TimeMachineTravelForwardParams.java
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.timeMachine.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class TimeMachineTravelForwardParams {
-
-  private final Map<String, Object> formData;
-
-  private TimeMachineTravelForwardParams(TimeMachineTravelForwardBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for TimeMachineTravelForwardParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TimeMachineTravelForwardBuilder builder() {
-    return new TimeMachineTravelForwardBuilder();
-  }
-
-  public static final class TimeMachineTravelForwardBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private TimeMachineTravelForwardBuilder() {}
-
-    public TimeMachineTravelForwardBuilder destinationTime(Timestamp value) {
-
-      formData.put("destination_time", value);
-
-      return this;
-    }
-
-    public TimeMachineTravelForwardParams build() {
-      return new TimeMachineTravelForwardParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/tpSiteUser/params/TpSiteUserGuestsForTpSiteUserParams.java b/src/main/java/com/chargebee/v4/core/models/tpSiteUser/params/TpSiteUserGuestsForTpSiteUserParams.java
deleted file mode 100644
index 05224beb..00000000
--- a/src/main/java/com/chargebee/v4/core/models/tpSiteUser/params/TpSiteUserGuestsForTpSiteUserParams.java
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.tpSiteUser.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class TpSiteUserGuestsForTpSiteUserParams {
-
-  private final Map<String, Object> queryParams;
-
-  private TpSiteUserGuestsForTpSiteUserParams(TpSiteUserGuestsForTpSiteUserBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public TpSiteUserGuestsForTpSiteUserBuilder toBuilder() {
-    TpSiteUserGuestsForTpSiteUserBuilder builder = new TpSiteUserGuestsForTpSiteUserBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for TpSiteUserGuestsForTpSiteUserParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TpSiteUserGuestsForTpSiteUserBuilder builder() {
-    return new TpSiteUserGuestsForTpSiteUserBuilder();
-  }
-
-  public static final class TpSiteUserGuestsForTpSiteUserBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private TpSiteUserGuestsForTpSiteUserBuilder() {}
-
-    public TpSiteUserGuestsForTpSiteUserBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public TpSiteUserGuestsForTpSiteUserBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public TpSiteUserGuestsForTpSiteUserParams build() {
-      return new TpSiteUserGuestsForTpSiteUserParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/tpSiteUser/params/TpSiteUserPayNowEnableLiveParams.java b/src/main/java/com/chargebee/v4/core/models/tpSiteUser/params/TpSiteUserPayNowEnableLiveParams.java
deleted file mode 100644
index 1a61798d..00000000
--- a/src/main/java/com/chargebee/v4/core/models/tpSiteUser/params/TpSiteUserPayNowEnableLiveParams.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.tpSiteUser.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class TpSiteUserPayNowEnableLiveParams {
-
-  private final Map<String, Object> formData;
-
-  private TpSiteUserPayNowEnableLiveParams(TpSiteUserPayNowEnableLiveBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for TpSiteUserPayNowEnableLiveParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TpSiteUserPayNowEnableLiveBuilder builder() {
-    return new TpSiteUserPayNowEnableLiveBuilder();
-  }
-
-  public static final class TpSiteUserPayNowEnableLiveBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private TpSiteUserPayNowEnableLiveBuilder() {}
-
-    public TpSiteUserPayNowEnableLiveBuilder domain(String value) {
-
-      formData.put("domain", value);
-
-      return this;
-    }
-
-    public TpSiteUserPayNowEnableLiveBuilder hostedPageToken(String value) {
-
-      formData.put("hosted_page_token", value);
-
-      return this;
-    }
-
-    public TpSiteUserPayNowEnableLiveParams build() {
-      return new TpSiteUserPayNowEnableLiveParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/tpSiteUser/params/TpSiteUserUsersForTpSiteUserParams.java b/src/main/java/com/chargebee/v4/core/models/tpSiteUser/params/TpSiteUserUsersForTpSiteUserParams.java
deleted file mode 100644
index c9b9ca0e..00000000
--- a/src/main/java/com/chargebee/v4/core/models/tpSiteUser/params/TpSiteUserUsersForTpSiteUserParams.java
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.tpSiteUser.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class TpSiteUserUsersForTpSiteUserParams {
-
-  private final Map<String, Object> queryParams;
-
-  private TpSiteUserUsersForTpSiteUserParams(TpSiteUserUsersForTpSiteUserBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public TpSiteUserUsersForTpSiteUserBuilder toBuilder() {
-    TpSiteUserUsersForTpSiteUserBuilder builder = new TpSiteUserUsersForTpSiteUserBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for TpSiteUserUsersForTpSiteUserParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TpSiteUserUsersForTpSiteUserBuilder builder() {
-    return new TpSiteUserUsersForTpSiteUserBuilder();
-  }
-
-  public static final class TpSiteUserUsersForTpSiteUserBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private TpSiteUserUsersForTpSiteUserBuilder() {}
-
-    public TpSiteUserUsersForTpSiteUserBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public TpSiteUserUsersForTpSiteUserBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public TpSiteUserUsersForTpSiteUserParams build() {
-      return new TpSiteUserUsersForTpSiteUserParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionCreateAuthorizationParams.java b/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionCreateAuthorizationParams.java
deleted file mode 100644
index 27d4838e..00000000
--- a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionCreateAuthorizationParams.java
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.transaction.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class TransactionCreateAuthorizationParams {
-
-  private final Map<String, Object> formData;
-
-  private TransactionCreateAuthorizationParams(TransactionCreateAuthorizationBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for TransactionCreateAuthorizationParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TransactionCreateAuthorizationBuilder builder() {
-    return new TransactionCreateAuthorizationBuilder();
-  }
-
-  public static final class TransactionCreateAuthorizationBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private TransactionCreateAuthorizationBuilder() {}
-
-    public TransactionCreateAuthorizationBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public TransactionCreateAuthorizationBuilder paymentSourceId(String value) {
-
-      formData.put("payment_source_id", value);
-
-      return this;
-    }
-
-    public TransactionCreateAuthorizationBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public TransactionCreateAuthorizationBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public TransactionCreateAuthorizationParams build() {
-      return new TransactionCreateAuthorizationParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionDeleteOfflineTransactionParams.java b/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionDeleteOfflineTransactionParams.java
deleted file mode 100644
index decbec71..00000000
--- a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionDeleteOfflineTransactionParams.java
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.transaction.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class TransactionDeleteOfflineTransactionParams {
-
-  private final Map<String, Object> formData;
-
-  private TransactionDeleteOfflineTransactionParams(
-      TransactionDeleteOfflineTransactionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for TransactionDeleteOfflineTransactionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TransactionDeleteOfflineTransactionBuilder builder() {
-    return new TransactionDeleteOfflineTransactionBuilder();
-  }
-
-  public static final class TransactionDeleteOfflineTransactionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private TransactionDeleteOfflineTransactionBuilder() {}
-
-    public TransactionDeleteOfflineTransactionBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public TransactionDeleteOfflineTransactionParams build() {
-      return new TransactionDeleteOfflineTransactionParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionReconcileParams.java b/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionReconcileParams.java
deleted file mode 100644
index d6fdb5b2..00000000
--- a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionReconcileParams.java
+++ /dev/null
@@ -1,92 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.transaction.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class TransactionReconcileParams {
-
-  private final Map<String, Object> formData;
-
-  private TransactionReconcileParams(TransactionReconcileBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for TransactionReconcileParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TransactionReconcileBuilder builder() {
-    return new TransactionReconcileBuilder();
-  }
-
-  public static final class TransactionReconcileBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private TransactionReconcileBuilder() {}
-
-    public TransactionReconcileBuilder idAtGateway(String value) {
-
-      formData.put("id_at_gateway", value);
-
-      return this;
-    }
-
-    public TransactionReconcileBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public TransactionReconcileBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public TransactionReconcileParams build() {
-      return new TransactionReconcileParams(this);
-    }
-  }
-
-  public enum Status {
-    SUCCESS("success"),
-
-    FAILURE("failure"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionRecordRefundParams.java b/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionRecordRefundParams.java
deleted file mode 100644
index 33097bd0..00000000
--- a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionRecordRefundParams.java
+++ /dev/null
@@ -1,126 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.transaction.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class TransactionRecordRefundParams {
-
-  private final Map<String, Object> formData;
-
-  private TransactionRecordRefundParams(TransactionRecordRefundBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for TransactionRecordRefundParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TransactionRecordRefundBuilder builder() {
-    return new TransactionRecordRefundBuilder();
-  }
-
-  public static final class TransactionRecordRefundBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private TransactionRecordRefundBuilder() {}
-
-    public TransactionRecordRefundBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public TransactionRecordRefundBuilder paymentMethod(PaymentMethod value) {
-
-      formData.put("payment_method", value);
-
-      return this;
-    }
-
-    public TransactionRecordRefundBuilder date(Timestamp value) {
-
-      formData.put("date", value);
-
-      return this;
-    }
-
-    public TransactionRecordRefundBuilder referenceNumber(String value) {
-
-      formData.put("reference_number", value);
-
-      return this;
-    }
-
-    public TransactionRecordRefundBuilder customPaymentMethodId(String value) {
-
-      formData.put("custom_payment_method_id", value);
-
-      return this;
-    }
-
-    public TransactionRecordRefundBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public TransactionRecordRefundParams build() {
-      return new TransactionRecordRefundParams(this);
-    }
-  }
-
-  public enum PaymentMethod {
-    CASH("cash"),
-
-    CHECK("check"),
-
-    CHARGEBACK("chargeback"),
-
-    BANK_TRANSFER("bank_transfer"),
-
-    OTHER("other"),
-
-    APP_STORE("app_store"),
-
-    PLAY_STORE("play_store"),
-
-    CUSTOM("custom"),
-
-    /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    PaymentMethod(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static PaymentMethod fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (PaymentMethod enumValue : PaymentMethod.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionRefundParams.java b/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionRefundParams.java
deleted file mode 100644
index 93c633bc..00000000
--- a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionRefundParams.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.transaction.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class TransactionRefundParams {
-
-  private final Map<String, Object> formData;
-
-  private TransactionRefundParams(TransactionRefundBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for TransactionRefundParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TransactionRefundBuilder builder() {
-    return new TransactionRefundBuilder();
-  }
-
-  public static final class TransactionRefundBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private TransactionRefundBuilder() {}
-
-    public TransactionRefundBuilder amount(Long value) {
-
-      formData.put("amount", value);
-
-      return this;
-    }
-
-    public TransactionRefundBuilder comment(String value) {
-
-      formData.put("comment", value);
-
-      return this;
-    }
-
-    public TransactionRefundParams build() {
-      return new TransactionRefundParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionSyncTransactionParams.java b/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionSyncTransactionParams.java
deleted file mode 100644
index 437ad43f..00000000
--- a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionSyncTransactionParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.transaction.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class TransactionSyncTransactionParams {
-
-  private final Map<String, Object> formData;
-
-  private TransactionSyncTransactionParams(TransactionSyncTransactionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for TransactionSyncTransactionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TransactionSyncTransactionBuilder builder() {
-    return new TransactionSyncTransactionBuilder();
-  }
-
-  public static final class TransactionSyncTransactionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private TransactionSyncTransactionBuilder() {}
-
-    public TransactionSyncTransactionParams build() {
-      return new TransactionSyncTransactionParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionTransactionsForCustomerParams.java b/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionTransactionsForCustomerParams.java
deleted file mode 100644
index f86caf5f..00000000
--- a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionTransactionsForCustomerParams.java
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.transaction.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class TransactionTransactionsForCustomerParams {
-
-  private final Map<String, Object> queryParams;
-
-  private TransactionTransactionsForCustomerParams(
-      TransactionTransactionsForCustomerBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public TransactionTransactionsForCustomerBuilder toBuilder() {
-    TransactionTransactionsForCustomerBuilder builder =
-        new TransactionTransactionsForCustomerBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for TransactionTransactionsForCustomerParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TransactionTransactionsForCustomerBuilder builder() {
-    return new TransactionTransactionsForCustomerBuilder();
-  }
-
-  public static final class TransactionTransactionsForCustomerBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private TransactionTransactionsForCustomerBuilder() {}
-
-    public TransactionTransactionsForCustomerBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public TransactionTransactionsForCustomerBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public TransactionTransactionsForCustomerParams build() {
-      return new TransactionTransactionsForCustomerParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionTransactionsForSubscriptionParams.java b/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionTransactionsForSubscriptionParams.java
deleted file mode 100644
index e0956456..00000000
--- a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionTransactionsForSubscriptionParams.java
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.transaction.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class TransactionTransactionsForSubscriptionParams {
-
-  private final Map<String, Object> queryParams;
-
-  private TransactionTransactionsForSubscriptionParams(
-      TransactionTransactionsForSubscriptionBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public TransactionTransactionsForSubscriptionBuilder toBuilder() {
-    TransactionTransactionsForSubscriptionBuilder builder =
-        new TransactionTransactionsForSubscriptionBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for TransactionTransactionsForSubscriptionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TransactionTransactionsForSubscriptionBuilder builder() {
-    return new TransactionTransactionsForSubscriptionBuilder();
-  }
-
-  public static final class TransactionTransactionsForSubscriptionBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private TransactionTransactionsForSubscriptionBuilder() {}
-
-    public TransactionTransactionsForSubscriptionBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public TransactionTransactionsForSubscriptionBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public TransactionTransactionsForSubscriptionParams build() {
-      return new TransactionTransactionsForSubscriptionParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionVoidTransactionParams.java b/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionVoidTransactionParams.java
deleted file mode 100644
index a2f5523a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionVoidTransactionParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.transaction.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class TransactionVoidTransactionParams {
-
-  private final Map<String, Object> formData;
-
-  private TransactionVoidTransactionParams(TransactionVoidTransactionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for TransactionVoidTransactionParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static TransactionVoidTransactionBuilder builder() {
-    return new TransactionVoidTransactionBuilder();
-  }
-
-  public static final class TransactionVoidTransactionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private TransactionVoidTransactionBuilder() {}
-
-    public TransactionVoidTransactionParams build() {
-      return new TransactionVoidTransactionParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeCreateParams.java b/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeCreateParams.java
deleted file mode 100644
index 291f00ab..00000000
--- a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeCreateParams.java
+++ /dev/null
@@ -1,529 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.unbilledCharge.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class UnbilledChargeCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private UnbilledChargeCreateParams(UnbilledChargeCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for UnbilledChargeCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static UnbilledChargeCreateBuilder builder() {
-    return new UnbilledChargeCreateBuilder();
-  }
-
-  public static final class UnbilledChargeCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private UnbilledChargeCreateBuilder() {}
-
-    public UnbilledChargeCreateBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public UnbilledChargeCreateBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public UnbilledChargeCreateBuilder itemPrices(List<ItemPricesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemPricesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_prices[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public UnbilledChargeCreateBuilder itemTiers(List<ItemTiersParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ItemTiersParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public UnbilledChargeCreateBuilder charges(List<ChargesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public UnbilledChargeCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public UnbilledChargeCreateParams build() {
-      return new UnbilledChargeCreateParams(this);
-    }
-  }
-
-  public static final class ItemPricesParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemPricesParams(ItemPricesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemPricesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemPricesBuilder builder() {
-      return new ItemPricesBuilder();
-    }
-
-    public static final class ItemPricesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemPricesBuilder() {}
-
-      public ItemPricesBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ItemPricesBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ItemPricesParams build() {
-        return new ItemPricesParams(this);
-      }
-    }
-  }
-
-  public static final class ItemTiersParams {
-
-    private final Map<String, Object> formData;
-
-    private ItemTiersParams(ItemTiersBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ItemTiersParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ItemTiersBuilder builder() {
-      return new ItemTiersBuilder();
-    }
-
-    public static final class ItemTiersBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ItemTiersBuilder() {}
-
-      public ItemTiersBuilder itemPriceId(String value) {
-
-        formData.put("item_price_id", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnit(Integer value) {
-
-        formData.put("starting_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnit(Integer value) {
-
-        formData.put("ending_unit", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder price(Long value) {
-
-        formData.put("price", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder startingUnitInDecimal(String value) {
-
-        formData.put("starting_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder endingUnitInDecimal(String value) {
-
-        formData.put("ending_unit_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder priceInDecimal(String value) {
-
-        formData.put("price_in_decimal", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder pricingType(PricingType value) {
-
-        formData.put("pricing_type", value);
-
-        return this;
-      }
-
-      public ItemTiersBuilder packageSize(Integer value) {
-
-        formData.put("package_size", value);
-
-        return this;
-      }
-
-      public ItemTiersParams build() {
-        return new ItemTiersParams(this);
-      }
-    }
-
-    public enum PricingType {
-      PER_UNIT("per_unit"),
-
-      FLAT_FEE("flat_fee"),
-
-      PACKAGE("package"),
-
-      /** An enum member indicating that PricingType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      PricingType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static PricingType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (PricingType enumValue : PricingType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class ChargesParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargesParams(ChargesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargesBuilder builder() {
-      return new ChargesBuilder();
-    }
-
-    public static final class ChargesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargesBuilder() {}
-
-      public ChargesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public ChargesBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public ChargesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxable(Boolean value) {
-
-        formData.put("taxable", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxProfileId(String value) {
-
-        formData.put("tax_profile_id", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTaxCode(String value) {
-
-        formData.put("avalara_tax_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder hsnCode(String value) {
-
-        formData.put("hsn_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxjarProductCode(String value) {
-
-        formData.put("taxjar_product_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ChargesParams build() {
-        return new ChargesParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeCreateUnbilledChargeParams.java b/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeCreateUnbilledChargeParams.java
deleted file mode 100644
index 1a612e3e..00000000
--- a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeCreateUnbilledChargeParams.java
+++ /dev/null
@@ -1,392 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.unbilledCharge.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class UnbilledChargeCreateUnbilledChargeParams {
-
-  private final Map<String, Object> formData;
-
-  private UnbilledChargeCreateUnbilledChargeParams(
-      UnbilledChargeCreateUnbilledChargeBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for UnbilledChargeCreateUnbilledChargeParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static UnbilledChargeCreateUnbilledChargeBuilder builder() {
-    return new UnbilledChargeCreateUnbilledChargeBuilder();
-  }
-
-  public static final class UnbilledChargeCreateUnbilledChargeBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private UnbilledChargeCreateUnbilledChargeBuilder() {}
-
-    public UnbilledChargeCreateUnbilledChargeBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public UnbilledChargeCreateUnbilledChargeBuilder currencyCode(String value) {
-
-      formData.put("currency_code", value);
-
-      return this;
-    }
-
-    public UnbilledChargeCreateUnbilledChargeBuilder addons(List<AddonsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          AddonsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public UnbilledChargeCreateUnbilledChargeBuilder charges(List<ChargesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          ChargesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public UnbilledChargeCreateUnbilledChargeBuilder taxProvidersFields(
-        List<TaxProvidersFieldsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          TaxProvidersFieldsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public UnbilledChargeCreateUnbilledChargeParams build() {
-      return new UnbilledChargeCreateUnbilledChargeParams(this);
-    }
-  }
-
-  public static final class AddonsParams {
-
-    private final Map<String, Object> formData;
-
-    private AddonsParams(AddonsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for AddonsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static AddonsBuilder builder() {
-      return new AddonsBuilder();
-    }
-
-    public static final class AddonsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private AddonsBuilder() {}
-
-      public AddonsBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantity(Integer value) {
-
-        formData.put("quantity", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPrice(Long value) {
-
-        formData.put("unit_price", value);
-
-        return this;
-      }
-
-      public AddonsBuilder quantityInDecimal(String value) {
-
-        formData.put("quantity_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder unitPriceInDecimal(String value) {
-
-        formData.put("unit_price_in_decimal", value);
-
-        return this;
-      }
-
-      public AddonsBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public AddonsBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public AddonsParams build() {
-        return new AddonsParams(this);
-      }
-    }
-  }
-
-  public static final class ChargesParams {
-
-    private final Map<String, Object> formData;
-
-    private ChargesParams(ChargesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for ChargesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static ChargesBuilder builder() {
-      return new ChargesBuilder();
-    }
-
-    public static final class ChargesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private ChargesBuilder() {}
-
-      public ChargesBuilder amount(Long value) {
-
-        formData.put("amount", value);
-
-        return this;
-      }
-
-      public ChargesBuilder amountInDecimal(String value) {
-
-        formData.put("amount_in_decimal", value);
-
-        return this;
-      }
-
-      public ChargesBuilder description(String value) {
-
-        formData.put("description", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxable(Boolean value) {
-
-        formData.put("taxable", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxProfileId(String value) {
-
-        formData.put("tax_profile_id", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTaxCode(String value) {
-
-        formData.put("avalara_tax_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder hsnCode(String value) {
-
-        formData.put("hsn_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder taxjarProductCode(String value) {
-
-        formData.put("taxjar_product_code", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
-
-        formData.put("avalara_sale_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraTransactionType(Integer value) {
-
-        formData.put("avalara_transaction_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder avalaraServiceType(Integer value) {
-
-        formData.put("avalara_service_type", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateFrom(Timestamp value) {
-
-        formData.put("date_from", value);
-
-        return this;
-      }
-
-      public ChargesBuilder dateTo(Timestamp value) {
-
-        formData.put("date_to", value);
-
-        return this;
-      }
-
-      public ChargesParams build() {
-        return new ChargesParams(this);
-      }
-    }
-
-    public enum AvalaraSaleType {
-      WHOLESALE("wholesale"),
-
-      RETAIL("retail"),
-
-      CONSUMED("consumed"),
-
-      VENDOR_USE("vendor_use"),
-
-      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
-      _UNKNOWN(null);
-      private final String value;
-
-      AvalaraSaleType(String value) {
-        this.value = value;
-      }
-
-      public String getValue() {
-        return value;
-      }
-
-      public static AvalaraSaleType fromString(String value) {
-        if (value == null) return _UNKNOWN;
-        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
-          if (enumValue.value != null && enumValue.value.equals(value)) {
-            return enumValue;
-          }
-        }
-        return _UNKNOWN;
-      }
-    }
-  }
-
-  public static final class TaxProvidersFieldsParams {
-
-    private final Map<String, Object> formData;
-
-    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for TaxProvidersFieldsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static TaxProvidersFieldsBuilder builder() {
-      return new TaxProvidersFieldsBuilder();
-    }
-
-    public static final class TaxProvidersFieldsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private TaxProvidersFieldsBuilder() {}
-
-      public TaxProvidersFieldsBuilder providerName(String value) {
-
-        formData.put("provider_name", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldId(String value) {
-
-        formData.put("field_id", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsBuilder fieldValue(String value) {
-
-        formData.put("field_value", value);
-
-        return this;
-      }
-
-      public TaxProvidersFieldsParams build() {
-        return new TaxProvidersFieldsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeInvoiceNowEstimateParams.java b/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeInvoiceNowEstimateParams.java
deleted file mode 100644
index 18d96c86..00000000
--- a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeInvoiceNowEstimateParams.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.unbilledCharge.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class UnbilledChargeInvoiceNowEstimateParams {
-
-  private final Map<String, Object> formData;
-
-  private UnbilledChargeInvoiceNowEstimateParams(UnbilledChargeInvoiceNowEstimateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for UnbilledChargeInvoiceNowEstimateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static UnbilledChargeInvoiceNowEstimateBuilder builder() {
-    return new UnbilledChargeInvoiceNowEstimateBuilder();
-  }
-
-  public static final class UnbilledChargeInvoiceNowEstimateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private UnbilledChargeInvoiceNowEstimateBuilder() {}
-
-    public UnbilledChargeInvoiceNowEstimateBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public UnbilledChargeInvoiceNowEstimateBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public UnbilledChargeInvoiceNowEstimateParams build() {
-      return new UnbilledChargeInvoiceNowEstimateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeInvoiceUnbilledChargesParams.java b/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeInvoiceUnbilledChargesParams.java
deleted file mode 100644
index a837616c..00000000
--- a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeInvoiceUnbilledChargesParams.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.unbilledCharge.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class UnbilledChargeInvoiceUnbilledChargesParams {
-
-  private final Map<String, Object> formData;
-
-  private UnbilledChargeInvoiceUnbilledChargesParams(
-      UnbilledChargeInvoiceUnbilledChargesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for UnbilledChargeInvoiceUnbilledChargesParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static UnbilledChargeInvoiceUnbilledChargesBuilder builder() {
-    return new UnbilledChargeInvoiceUnbilledChargesBuilder();
-  }
-
-  public static final class UnbilledChargeInvoiceUnbilledChargesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private UnbilledChargeInvoiceUnbilledChargesBuilder() {}
-
-    public UnbilledChargeInvoiceUnbilledChargesBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public UnbilledChargeInvoiceUnbilledChargesBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public UnbilledChargeInvoiceUnbilledChargesParams build() {
-      return new UnbilledChargeInvoiceUnbilledChargesParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/usage/params/UsageCreateParams.java b/src/main/java/com/chargebee/v4/core/models/usage/params/UsageCreateParams.java
deleted file mode 100644
index 9a92edff..00000000
--- a/src/main/java/com/chargebee/v4/core/models/usage/params/UsageCreateParams.java
+++ /dev/null
@@ -1,115 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.usage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.sql.Timestamp;
-
-public final class UsageCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private UsageCreateParams(UsageCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for UsageCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static UsageCreateBuilder builder() {
-    return new UsageCreateBuilder();
-  }
-
-  public static final class UsageCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private UsageCreateBuilder() {}
-
-    public UsageCreateBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public UsageCreateBuilder itemPriceId(String value) {
-
-      formData.put("item_price_id", value);
-
-      return this;
-    }
-
-    public UsageCreateBuilder quantity(String value) {
-
-      formData.put("quantity", value);
-
-      return this;
-    }
-
-    public UsageCreateBuilder usageDate(Timestamp value) {
-
-      formData.put("usage_date", value);
-
-      return this;
-    }
-
-    @Deprecated
-    public UsageCreateBuilder dedupeOption(DedupeOption value) {
-
-      formData.put("dedupe_option", value);
-
-      return this;
-    }
-
-    public UsageCreateBuilder note(String value) {
-
-      formData.put("note", value);
-
-      return this;
-    }
-
-    public UsageCreateParams build() {
-      return new UsageCreateParams(this);
-    }
-  }
-
-  public enum DedupeOption {
-    SKIP("skip"),
-
-    UPDATE_EXISTING("update_existing"),
-
-    /** An enum member indicating that DedupeOption was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    DedupeOption(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static DedupeOption fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (DedupeOption enumValue : DedupeOption.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/usage/params/UsagePdfParams.java b/src/main/java/com/chargebee/v4/core/models/usage/params/UsagePdfParams.java
deleted file mode 100644
index 779a7907..00000000
--- a/src/main/java/com/chargebee/v4/core/models/usage/params/UsagePdfParams.java
+++ /dev/null
@@ -1,126 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.usage.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class UsagePdfParams {
-
-  private final Map<String, Object> formData;
-
-  private UsagePdfParams(UsagePdfBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for UsagePdfParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static UsagePdfBuilder builder() {
-    return new UsagePdfBuilder();
-  }
-
-  public static final class UsagePdfBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private UsagePdfBuilder() {}
-
-    public UsagePdfBuilder dispositionType(DispositionType value) {
-
-      formData.put("disposition_type", value);
-
-      return this;
-    }
-
-    public UsagePdfBuilder invoice(InvoiceParams value) {
-      if (value != null) {
-        Map<String, Object> nestedData = value.toFormData();
-        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
-          String nestedKey = "invoice[" + entry.getKey() + "]";
-          formData.put(nestedKey, entry.getValue());
-        }
-      }
-      return this;
-    }
-
-    public UsagePdfParams build() {
-      return new UsagePdfParams(this);
-    }
-  }
-
-  public enum DispositionType {
-    ATTACHMENT("attachment"),
-
-    INLINE("inline"),
-
-    /** An enum member indicating that DispositionType was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    DispositionType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static DispositionType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (DispositionType enumValue : DispositionType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class InvoiceParams {
-
-    private final Map<String, Object> formData;
-
-    private InvoiceParams(InvoiceBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for InvoiceParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static InvoiceBuilder builder() {
-      return new InvoiceBuilder();
-    }
-
-    public static final class InvoiceBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private InvoiceBuilder() {}
-
-      public InvoiceBuilder id(String value) {
-
-        formData.put("id", value);
-
-        return this;
-      }
-
-      public InvoiceParams build() {
-        return new InvoiceParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/usageEvent/params/UsageEventBatchIngestParams.java b/src/main/java/com/chargebee/v4/core/models/usageEvent/params/UsageEventBatchIngestParams.java
deleted file mode 100644
index 3a7a6ffb..00000000
--- a/src/main/java/com/chargebee/v4/core/models/usageEvent/params/UsageEventBatchIngestParams.java
+++ /dev/null
@@ -1,120 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.usageEvent.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-import java.sql.Timestamp;
-
-public final class UsageEventBatchIngestParams {
-
-  private final Map<String, Object> formData;
-
-  private UsageEventBatchIngestParams(UsageEventBatchIngestBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for UsageEventBatchIngestParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static UsageEventBatchIngestBuilder builder() {
-    return new UsageEventBatchIngestBuilder();
-  }
-
-  public static final class UsageEventBatchIngestBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private UsageEventBatchIngestBuilder() {}
-
-    public UsageEventBatchIngestBuilder events(List<EventsParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          EventsParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "events[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public UsageEventBatchIngestParams build() {
-      return new UsageEventBatchIngestParams(this);
-    }
-  }
-
-  public static final class EventsParams {
-
-    private final Map<String, Object> formData;
-
-    private EventsParams(EventsBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for EventsParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static EventsBuilder builder() {
-      return new EventsBuilder();
-    }
-
-    public static final class EventsBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private EventsBuilder() {}
-
-      public EventsBuilder deduplicationId(String value) {
-
-        formData.put("deduplication_id", value);
-
-        return this;
-      }
-
-      public EventsBuilder subscriptionId(String value) {
-
-        formData.put("subscription_id", value);
-
-        return this;
-      }
-
-      public EventsBuilder usageTimestamp(Timestamp value) {
-
-        formData.put("usage_timestamp", value);
-
-        return this;
-      }
-
-      public EventsBuilder properties(java.util.Map<String, Object> value) {
-
-        formData.put("properties", JsonUtil.toJson(value));
-
-        return this;
-      }
-
-      public EventsParams build() {
-        return new EventsParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/usageEvent/params/UsageEventCreateParams.java b/src/main/java/com/chargebee/v4/core/models/usageEvent/params/UsageEventCreateParams.java
deleted file mode 100644
index 9f6e2c34..00000000
--- a/src/main/java/com/chargebee/v4/core/models/usageEvent/params/UsageEventCreateParams.java
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.usageEvent.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class UsageEventCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private UsageEventCreateParams(UsageEventCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for UsageEventCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static UsageEventCreateBuilder builder() {
-    return new UsageEventCreateBuilder();
-  }
-
-  public static final class UsageEventCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private UsageEventCreateBuilder() {}
-
-    public UsageEventCreateBuilder deduplicationId(String value) {
-
-      formData.put("deduplication_id", value);
-
-      return this;
-    }
-
-    public UsageEventCreateBuilder subscriptionId(String value) {
-
-      formData.put("subscription_id", value);
-
-      return this;
-    }
-
-    public UsageEventCreateBuilder usageTimestamp(Long value) {
-
-      formData.put("usage_timestamp", value);
-
-      return this;
-    }
-
-    public UsageEventCreateBuilder properties(java.util.Map<String, Object> value) {
-
-      formData.put("properties", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public UsageEventCreateParams build() {
-      return new UsageEventCreateParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/usageFile/params/UsageFileUploadUrlParams.java b/src/main/java/com/chargebee/v4/core/models/usageFile/params/UsageFileUploadUrlParams.java
deleted file mode 100644
index 3d4fe0b6..00000000
--- a/src/main/java/com/chargebee/v4/core/models/usageFile/params/UsageFileUploadUrlParams.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.usageFile.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class UsageFileUploadUrlParams {
-
-  private final Map<String, Object> formData;
-
-  private UsageFileUploadUrlParams(UsageFileUploadUrlBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for UsageFileUploadUrlParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static UsageFileUploadUrlBuilder builder() {
-    return new UsageFileUploadUrlBuilder();
-  }
-
-  public static final class UsageFileUploadUrlBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private UsageFileUploadUrlBuilder() {}
-
-    public UsageFileUploadUrlBuilder fileName(String value) {
-
-      formData.put("file_name", value);
-
-      return this;
-    }
-
-    public UsageFileUploadUrlBuilder mimeType(String value) {
-
-      formData.put("mime_type", value);
-
-      return this;
-    }
-
-    public UsageFileUploadUrlParams build() {
-      return new UsageFileUploadUrlParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/variant/params/VariantCreateProductVariantParams.java b/src/main/java/com/chargebee/v4/core/models/variant/params/VariantCreateProductVariantParams.java
deleted file mode 100644
index a6180205..00000000
--- a/src/main/java/com/chargebee/v4/core/models/variant/params/VariantCreateProductVariantParams.java
+++ /dev/null
@@ -1,182 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.variant.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class VariantCreateProductVariantParams {
-
-  private final Map<String, Object> formData;
-
-  private VariantCreateProductVariantParams(VariantCreateProductVariantBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for VariantCreateProductVariantParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static VariantCreateProductVariantBuilder builder() {
-    return new VariantCreateProductVariantBuilder();
-  }
-
-  public static final class VariantCreateProductVariantBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private VariantCreateProductVariantBuilder() {}
-
-    public VariantCreateProductVariantBuilder id(String value) {
-
-      formData.put("id", value);
-
-      return this;
-    }
-
-    public VariantCreateProductVariantBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public VariantCreateProductVariantBuilder externalName(String value) {
-
-      formData.put("external_name", value);
-
-      return this;
-    }
-
-    public VariantCreateProductVariantBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public VariantCreateProductVariantBuilder sku(String value) {
-
-      formData.put("sku", value);
-
-      return this;
-    }
-
-    public VariantCreateProductVariantBuilder metadata(java.util.Map<String, Object> value) {
-
-      formData.put("metadata", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public VariantCreateProductVariantBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public VariantCreateProductVariantBuilder optionValues(List<OptionValuesParams> value) {
-      if (value != null && !value.isEmpty()) {
-        for (int i = 0; i < value.size(); i++) {
-          OptionValuesParams item = value.get(i);
-          if (item != null) {
-            Map<String, Object> itemData = item.toFormData();
-            for (Map.Entry<String, Object> entry : itemData.entrySet()) {
-              String indexedKey = "option_values[" + entry.getKey() + "][" + i + "]";
-              formData.put(indexedKey, entry.getValue());
-            }
-          }
-        }
-      }
-      return this;
-    }
-
-    public VariantCreateProductVariantParams build() {
-      return new VariantCreateProductVariantParams(this);
-    }
-  }
-
-  public enum Status {
-    ACTIVE("active"),
-
-    INACTIVE("inactive"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public static final class OptionValuesParams {
-
-    private final Map<String, Object> formData;
-
-    private OptionValuesParams(OptionValuesBuilder builder) {
-      this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-    }
-
-    /** Get the form data for this request. */
-    public Map<String, Object> toFormData() {
-      return formData;
-    }
-
-    /** Create a new builder for OptionValuesParams. */
-    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-    public static OptionValuesBuilder builder() {
-      return new OptionValuesBuilder();
-    }
-
-    public static final class OptionValuesBuilder {
-      private final Map<String, Object> formData = new LinkedHashMap<>();
-
-      private OptionValuesBuilder() {}
-
-      public OptionValuesBuilder name(String value) {
-
-        formData.put("name", value);
-
-        return this;
-      }
-
-      public OptionValuesBuilder value(String value) {
-
-        formData.put("value", value);
-
-        return this;
-      }
-
-      public OptionValuesParams build() {
-        return new OptionValuesParams(this);
-      }
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/variant/params/VariantDeleteParams.java b/src/main/java/com/chargebee/v4/core/models/variant/params/VariantDeleteParams.java
deleted file mode 100644
index bc06174e..00000000
--- a/src/main/java/com/chargebee/v4/core/models/variant/params/VariantDeleteParams.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.variant.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class VariantDeleteParams {
-
-  private final Map<String, Object> formData;
-
-  private VariantDeleteParams(VariantDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for VariantDeleteParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static VariantDeleteBuilder builder() {
-    return new VariantDeleteBuilder();
-  }
-
-  public static final class VariantDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private VariantDeleteBuilder() {}
-
-    public VariantDeleteParams build() {
-      return new VariantDeleteParams(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/variant/params/VariantListProductVariantsParams.java b/src/main/java/com/chargebee/v4/core/models/variant/params/VariantListProductVariantsParams.java
deleted file mode 100644
index 055920c3..00000000
--- a/src/main/java/com/chargebee/v4/core/models/variant/params/VariantListProductVariantsParams.java
+++ /dev/null
@@ -1,470 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.models.variant.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.sql.Timestamp;
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class VariantListProductVariantsParams {
-
-  private final Map<String, Object> queryParams;
-
-  private VariantListProductVariantsParams(VariantListProductVariantsBuilder builder) {
-    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
-  }
-
-  /** Get the query parameters for this request. */
-  public Map<String, Object> toQueryParams() {
-    return queryParams;
-  }
-
-  public VariantListProductVariantsBuilder toBuilder() {
-    VariantListProductVariantsBuilder builder = new VariantListProductVariantsBuilder();
-    builder.queryParams.putAll(queryParams);
-    return builder;
-  }
-
-  /** Create a new builder for VariantListProductVariantsParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static VariantListProductVariantsBuilder builder() {
-    return new VariantListProductVariantsBuilder();
-  }
-
-  public static final class VariantListProductVariantsBuilder {
-    private final Map<String, Object> queryParams = new LinkedHashMap<>();
-
-    private VariantListProductVariantsBuilder() {}
-
-    public VariantListProductVariantsBuilder limit(Integer value) {
-      queryParams.put("limit", value);
-      return this;
-    }
-
-    public VariantListProductVariantsBuilder offset(String value) {
-      queryParams.put("offset", value);
-      return this;
-    }
-
-    public VariantListProductVariantsBuilder includeDeleted(Boolean value) {
-      queryParams.put("include_deleted", value);
-      return this;
-    }
-
-    public IdFilter id() {
-      return new IdFilter("id", this);
-    }
-
-    public NameFilter name() {
-      return new NameFilter("name", this);
-    }
-
-    public SkuFilter sku() {
-      return new SkuFilter("sku", this);
-    }
-
-    public StatusFilter status() {
-      return new StatusFilter("status", this);
-    }
-
-    public UpdatedAtFilter updatedAt() {
-      return new UpdatedAtFilter("updated_at", this);
-    }
-
-    public CreatedAtFilter createdAt() {
-      return new CreatedAtFilter("created_at", this);
-    }
-
-    public SortBySortBuilder sortBy() {
-      return new SortBySortBuilder("sort_by", this);
-    }
-
-    public VariantListProductVariantsParams build() {
-      return new VariantListProductVariantsParams(this);
-    }
-
-    public static final class IdFilter {
-      private final String fieldName;
-      private final VariantListProductVariantsBuilder builder;
-
-      IdFilter(String fieldName, VariantListProductVariantsBuilder builder) {
-        this.fieldName = fieldName;
-        this.builder = builder;
-      }
-
-      public VariantListProductVariantsBuilder is(String value) {
-        builder.queryParams.put(fieldName + "[is]", value);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder isNot(String value) {
-        builder.queryParams.put(fieldName + "[is_not]", value);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder startsWith(String value) {
-        builder.queryParams.put(fieldName + "[starts_with]", value);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder in(String... values) {
-        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder notIn(String... values) {
-        builder.queryParams.put(fieldName + "[not_in]", "[" + String.join(",", values) + "]");
-        return builder;
-      }
-    }
-
-    public static final class NameFilter {
-      private final String fieldName;
-      private final VariantListProductVariantsBuilder builder;
-
-      NameFilter(String fieldName, VariantListProductVariantsBuilder builder) {
-        this.fieldName = fieldName;
-        this.builder = builder;
-      }
-
-      public VariantListProductVariantsBuilder is(String value) {
-        builder.queryParams.put(fieldName + "[is]", value);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder isNot(String value) {
-        builder.queryParams.put(fieldName + "[is_not]", value);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder startsWith(String value) {
-        builder.queryParams.put(fieldName + "[starts_with]", value);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder in(String... values) {
-        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder notIn(String... values) {
-        builder.queryParams.put(fieldName + "[not_in]", "[" + String.join(",", values) + "]");
-        return builder;
-      }
-    }
-
-    public static final class SkuFilter {
-      private final String fieldName;
-      private final VariantListProductVariantsBuilder builder;
-
-      SkuFilter(String fieldName, VariantListProductVariantsBuilder builder) {
-        this.fieldName = fieldName;
-        this.builder = builder;
-      }
-
-      public VariantListProductVariantsBuilder is(String value) {
-        builder.queryParams.put(fieldName + "[is]", value);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder isNot(String value) {
-        builder.queryParams.put(fieldName + "[is_not]", value);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder startsWith(String value) {
-        builder.queryParams.put(fieldName + "[starts_with]", value);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder in(String... values) {
-        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder notIn(String... values) {
-        builder.queryParams.put(fieldName + "[not_in]", "[" + String.join(",", values) + "]");
-        return builder;
-      }
-    }
-
-    public static final class StatusFilter {
-      private final String fieldName;
-      private final VariantListProductVariantsBuilder builder;
-
-      StatusFilter(String fieldName, VariantListProductVariantsBuilder builder) {
-        this.fieldName = fieldName;
-        this.builder = builder;
-      }
-
-      public VariantListProductVariantsBuilder is(String value) {
-        builder.queryParams.put(fieldName + "[is]", value);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder isNot(String value) {
-        builder.queryParams.put(fieldName + "[is_not]", value);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder in(String... values) {
-        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder notIn(String... values) {
-        builder.queryParams.put(fieldName + "[not_in]", "[" + String.join(",", values) + "]");
-        return builder;
-      }
-    }
-
-    public static final class UpdatedAtFilter {
-      private final String fieldName;
-      private final VariantListProductVariantsBuilder builder;
-
-      UpdatedAtFilter(String fieldName, VariantListProductVariantsBuilder builder) {
-        this.fieldName = fieldName;
-        this.builder = builder;
-      }
-
-      public VariantListProductVariantsBuilder after(Timestamp timestamp) {
-        builder.queryParams.put(fieldName + "[after]", timestamp.getTime() / 1000);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder before(Timestamp timestamp) {
-        builder.queryParams.put(fieldName + "[before]", timestamp.getTime() / 1000);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder on(Timestamp timestamp) {
-        builder.queryParams.put(fieldName + "[on]", timestamp.getTime() / 1000);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder between(Timestamp start, Timestamp end) {
-        builder.queryParams.put(
-            fieldName + "[between]",
-            "[" + (start.getTime() / 1000) + "," + (end.getTime() / 1000) + "]");
-        return builder;
-      }
-    }
-
-    public static final class CreatedAtFilter {
-      private final String fieldName;
-      private final VariantListProductVariantsBuilder builder;
-
-      CreatedAtFilter(String fieldName, VariantListProductVariantsBuilder builder) {
-        this.fieldName = fieldName;
-        this.builder = builder;
-      }
-
-      public VariantListProductVariantsBuilder after(Timestamp timestamp) {
-        builder.queryParams.put(fieldName + "[after]", timestamp.getTime() / 1000);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder before(Timestamp timestamp) {
-        builder.queryParams.put(fieldName + "[before]", timestamp.getTime() / 1000);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder on(Timestamp timestamp) {
-        builder.queryParams.put(fieldName + "[on]", timestamp.getTime() / 1000);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder between(Timestamp start, Timestamp end) {
-        builder.queryParams.put(
-            fieldName + "[between]",
-            "[" + (start.getTime() / 1000) + "," + (end.getTime() / 1000) + "]");
-        return builder;
-      }
-    }
-
-    public static final class SortBySortBuilder {
-      private final String fieldName;
-      private final VariantListProductVariantsBuilder builder;
-
-      SortBySortBuilder(String fieldName, VariantListProductVariantsBuilder builder) {
-        this.fieldName = fieldName;
-        this.builder = builder;
-      }
-
-      public SortDirection name() {
-        return new SortDirection(fieldName, "name", builder);
-      }
-
-      public SortDirection id() {
-        return new SortDirection(fieldName, "id", builder);
-      }
-
-      public SortDirection status() {
-        return new SortDirection(fieldName, "status", builder);
-      }
-
-      public SortDirection created_at() {
-        return new SortDirection(fieldName, "created_at", builder);
-      }
-
-      public SortDirection updated_at() {
-        return new SortDirection(fieldName, "updated_at", builder);
-      }
-    }
-
-    public static final class SortDirection {
-      private final String fieldName;
-      private final String selectedField;
-      private final VariantListProductVariantsBuilder builder;
-
-      SortDirection(
-          String fieldName, String selectedField, VariantListProductVariantsBuilder builder) {
-        this.fieldName = fieldName;
-        this.selectedField = selectedField;
-        this.builder = builder;
-      }
-
-      public VariantListProductVariantsBuilder asc() {
-        builder.queryParams.put(fieldName + "[asc]", selectedField);
-        return builder;
-      }
-
-      public VariantListProductVariantsBuilder desc() {
-        builder.queryParams.put(fieldName + "[desc]", selectedField);
-        return builder;
-      }
-    }
-  }
-
-  public enum StatusIs {
-    ACTIVE("active"),
-
-    INACTIVE("inactive"),
-
-    /** An enum member indicating that StatusIs was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    StatusIs(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static StatusIs fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (StatusIs enumValue : StatusIs.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum StatusIsNot {
-    ACTIVE("active"),
-
-    INACTIVE("inactive"),
-
-    /** An enum member indicating that StatusIsNot was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    StatusIsNot(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static StatusIsNot fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (StatusIsNot enumValue : StatusIsNot.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum SortByAsc {
-    NAME("name"),
-
-    ID("id"),
-
-    STATUS("status"),
-
-    CREATED_AT("created_at"),
-
-    UPDATED_AT("updated_at"),
-
-    /** An enum member indicating that SortByAsc was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    SortByAsc(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static SortByAsc fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (SortByAsc enumValue : SortByAsc.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum SortByDesc {
-    NAME("name"),
-
-    ID("id"),
-
-    STATUS("status"),
-
-    CREATED_AT("created_at"),
-
-    UPDATED_AT("updated_at"),
-
-    /** An enum member indicating that SortByDesc was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    SortByDesc(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static SortByDesc fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (SortByDesc enumValue : SortByDesc.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/variant/params/VariantUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/variant/params/VariantUpdateParams.java
deleted file mode 100644
index 6d2227e5..00000000
--- a/src/main/java/com/chargebee/v4/core/models/variant/params/VariantUpdateParams.java
+++ /dev/null
@@ -1,114 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.variant.params;
-
-import com.chargebee.v4.internal.Recommended;
-import com.chargebee.v4.internal.JsonUtil;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class VariantUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private VariantUpdateParams(VariantUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for VariantUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static VariantUpdateBuilder builder() {
-    return new VariantUpdateBuilder();
-  }
-
-  public static final class VariantUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private VariantUpdateBuilder() {}
-
-    public VariantUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public VariantUpdateBuilder description(String value) {
-
-      formData.put("description", value);
-
-      return this;
-    }
-
-    public VariantUpdateBuilder status(Status value) {
-
-      formData.put("status", value);
-
-      return this;
-    }
-
-    public VariantUpdateBuilder externalName(String value) {
-
-      formData.put("external_name", value);
-
-      return this;
-    }
-
-    public VariantUpdateBuilder sku(String value) {
-
-      formData.put("sku", value);
-
-      return this;
-    }
-
-    public VariantUpdateBuilder metadata(java.util.Map<String, Object> value) {
-
-      formData.put("metadata", JsonUtil.toJson(value));
-
-      return this;
-    }
-
-    public VariantUpdateParams build() {
-      return new VariantUpdateParams(this);
-    }
-  }
-
-  public enum Status {
-    ACTIVE("active"),
-
-    INACTIVE("inactive"),
-
-    /** An enum member indicating that Status was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Status(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Status fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Status enumValue : Status.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountCreateParams.java b/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountCreateParams.java
deleted file mode 100644
index a9769295..00000000
--- a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountCreateParams.java
+++ /dev/null
@@ -1,102 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.virtualBankAccount.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class VirtualBankAccountCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private VirtualBankAccountCreateParams(VirtualBankAccountCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for VirtualBankAccountCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static VirtualBankAccountCreateBuilder builder() {
-    return new VirtualBankAccountCreateBuilder();
-  }
-
-  public static final class VirtualBankAccountCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private VirtualBankAccountCreateBuilder() {}
-
-    public VirtualBankAccountCreateBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public VirtualBankAccountCreateBuilder email(String value) {
-
-      formData.put("email", value);
-
-      return this;
-    }
-
-    public VirtualBankAccountCreateBuilder scheme(Scheme value) {
-
-      formData.put("scheme", value);
-
-      return this;
-    }
-
-    public VirtualBankAccountCreateParams build() {
-      return new VirtualBankAccountCreateParams(this);
-    }
-  }
-
-  public enum Scheme {
-    ACH_CREDIT("ach_credit"),
-
-    SEPA_CREDIT("sepa_credit"),
-
-    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-    GB_AUTOMATED_BANK_TRANSFER("gb_automated_bank_transfer"),
-
-    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-    /** An enum member indicating that Scheme was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Scheme(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Scheme fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Scheme enumValue : Scheme.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountCreateUsingPermanentTokenParams.java b/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountCreateUsingPermanentTokenParams.java
deleted file mode 100644
index af68ad0a..00000000
--- a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountCreateUsingPermanentTokenParams.java
+++ /dev/null
@@ -1,103 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.virtualBankAccount.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-public final class VirtualBankAccountCreateUsingPermanentTokenParams {
-
-  private final Map<String, Object> formData;
-
-  private VirtualBankAccountCreateUsingPermanentTokenParams(
-      VirtualBankAccountCreateUsingPermanentTokenBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for VirtualBankAccountCreateUsingPermanentTokenParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static VirtualBankAccountCreateUsingPermanentTokenBuilder builder() {
-    return new VirtualBankAccountCreateUsingPermanentTokenBuilder();
-  }
-
-  public static final class VirtualBankAccountCreateUsingPermanentTokenBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private VirtualBankAccountCreateUsingPermanentTokenBuilder() {}
-
-    public VirtualBankAccountCreateUsingPermanentTokenBuilder customerId(String value) {
-
-      formData.put("customer_id", value);
-
-      return this;
-    }
-
-    public VirtualBankAccountCreateUsingPermanentTokenBuilder referenceId(String value) {
-
-      formData.put("reference_id", value);
-
-      return this;
-    }
-
-    public VirtualBankAccountCreateUsingPermanentTokenBuilder scheme(Scheme value) {
-
-      formData.put("scheme", value);
-
-      return this;
-    }
-
-    public VirtualBankAccountCreateUsingPermanentTokenParams build() {
-      return new VirtualBankAccountCreateUsingPermanentTokenParams(this);
-    }
-  }
-
-  public enum Scheme {
-    ACH_CREDIT("ach_credit"),
-
-    SEPA_CREDIT("sepa_credit"),
-
-    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
-
-    GB_AUTOMATED_BANK_TRANSFER("gb_automated_bank_transfer"),
-
-    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
-
-    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
-
-    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
-
-    /** An enum member indicating that Scheme was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    Scheme(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static Scheme fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (Scheme enumValue : Scheme.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointCreateParams.java b/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointCreateParams.java
deleted file mode 100644
index 01e03834..00000000
--- a/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointCreateParams.java
+++ /dev/null
@@ -1,176 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.webhookEndpoint.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class WebhookEndpointCreateParams {
-
-  private final Map<String, Object> formData;
-
-  private WebhookEndpointCreateParams(WebhookEndpointCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for WebhookEndpointCreateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static WebhookEndpointCreateBuilder builder() {
-    return new WebhookEndpointCreateBuilder();
-  }
-
-  public static final class WebhookEndpointCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private WebhookEndpointCreateBuilder() {}
-
-    public WebhookEndpointCreateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public WebhookEndpointCreateBuilder apiVersion(ApiVersion value) {
-
-      formData.put("api_version", value);
-
-      return this;
-    }
-
-    public WebhookEndpointCreateBuilder url(String value) {
-
-      formData.put("url", value);
-
-      return this;
-    }
-
-    public WebhookEndpointCreateBuilder primaryUrl(Boolean value) {
-
-      formData.put("primary_url", value);
-
-      return this;
-    }
-
-    public WebhookEndpointCreateBuilder disabled(Boolean value) {
-
-      formData.put("disabled", value);
-
-      return this;
-    }
-
-    public WebhookEndpointCreateBuilder basicAuthPassword(String value) {
-
-      formData.put("basic_auth_password", value);
-
-      return this;
-    }
-
-    public WebhookEndpointCreateBuilder basicAuthUsername(String value) {
-
-      formData.put("basic_auth_username", value);
-
-      return this;
-    }
-
-    public WebhookEndpointCreateBuilder sendCardResource(Boolean value) {
-
-      formData.put("send_card_resource", value);
-
-      return this;
-    }
-
-    public WebhookEndpointCreateBuilder chargebeeResponseSchemaType(
-        ChargebeeResponseSchemaType value) {
-
-      formData.put("chargebee_response_schema_type", value);
-
-      return this;
-    }
-
-    public WebhookEndpointCreateBuilder enabledEvents(List<String> value) {
-
-      formData.put("enabled_events", value);
-
-      return this;
-    }
-
-    public WebhookEndpointCreateParams build() {
-      return new WebhookEndpointCreateParams(this);
-    }
-  }
-
-  public enum ApiVersion {
-    V1("v1"),
-
-    V2("v2"),
-
-    /** An enum member indicating that ApiVersion was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ApiVersion(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ApiVersion fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ApiVersion enumValue : ApiVersion.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-
-  public enum ChargebeeResponseSchemaType {
-    PLANS_ADDONS("plans_addons"),
-
-    ITEMS("items"),
-
-    COMPAT("compat"),
-
-    /**
-     * An enum member indicating that ChargebeeResponseSchemaType was instantiated with an unknown
-     * value.
-     */
-    _UNKNOWN(null);
-    private final String value;
-
-    ChargebeeResponseSchemaType(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ChargebeeResponseSchemaType fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ChargebeeResponseSchemaType enumValue : ChargebeeResponseSchemaType.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointUpdateParams.java b/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointUpdateParams.java
deleted file mode 100644
index 79aa4ba4..00000000
--- a/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointUpdateParams.java
+++ /dev/null
@@ -1,135 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-package com.chargebee.v4.core.models.webhookEndpoint.params;
-
-import com.chargebee.v4.internal.Recommended;
-
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.List;
-
-public final class WebhookEndpointUpdateParams {
-
-  private final Map<String, Object> formData;
-
-  private WebhookEndpointUpdateParams(WebhookEndpointUpdateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
-
-  /** Get the form data for this request. */
-  public Map<String, Object> toFormData() {
-    return formData;
-  }
-
-  /** Create a new builder for WebhookEndpointUpdateParams. */
-  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
-  public static WebhookEndpointUpdateBuilder builder() {
-    return new WebhookEndpointUpdateBuilder();
-  }
-
-  public static final class WebhookEndpointUpdateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
-
-    private WebhookEndpointUpdateBuilder() {}
-
-    public WebhookEndpointUpdateBuilder name(String value) {
-
-      formData.put("name", value);
-
-      return this;
-    }
-
-    public WebhookEndpointUpdateBuilder apiVersion(ApiVersion value) {
-
-      formData.put("api_version", value);
-
-      return this;
-    }
-
-    public WebhookEndpointUpdateBuilder url(String value) {
-
-      formData.put("url", value);
-
-      return this;
-    }
-
-    public WebhookEndpointUpdateBuilder primaryUrl(Boolean value) {
-
-      formData.put("primary_url", value);
-
-      return this;
-    }
-
-    public WebhookEndpointUpdateBuilder sendCardResource(Boolean value) {
-
-      formData.put("send_card_resource", value);
-
-      return this;
-    }
-
-    public WebhookEndpointUpdateBuilder basicAuthPassword(String value) {
-
-      formData.put("basic_auth_password", value);
-
-      return this;
-    }
-
-    public WebhookEndpointUpdateBuilder basicAuthUsername(String value) {
-
-      formData.put("basic_auth_username", value);
-
-      return this;
-    }
-
-    public WebhookEndpointUpdateBuilder disabled(Boolean value) {
-
-      formData.put("disabled", value);
-
-      return this;
-    }
-
-    public WebhookEndpointUpdateBuilder enabledEvents(List<String> value) {
-
-      formData.put("enabled_events", value);
-
-      return this;
-    }
-
-    public WebhookEndpointUpdateParams build() {
-      return new WebhookEndpointUpdateParams(this);
-    }
-  }
-
-  public enum ApiVersion {
-    V1("v1"),
-
-    V2("v2"),
-
-    /** An enum member indicating that ApiVersion was instantiated with an unknown value. */
-    _UNKNOWN(null);
-    private final String value;
-
-    ApiVersion(String value) {
-      this.value = value;
-    }
-
-    public String getValue() {
-      return value;
-    }
-
-    public static ApiVersion fromString(String value) {
-      if (value == null) return _UNKNOWN;
-      for (ApiVersion enumValue : ApiVersion.values()) {
-        if (enumValue.value != null && enumValue.value.equals(value)) {
-          return enumValue;
-        }
-      }
-      return _UNKNOWN;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/additionalBillingLogiq/AdditionalBillingLogiqRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/additionalBillingLogiq/AdditionalBillingLogiqRetrieveResponse.java
deleted file mode 100644
index 3dbaa8dd..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/additionalBillingLogiq/AdditionalBillingLogiqRetrieveResponse.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.chargebee.v4.core.responses.additionalBillingLogiq;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for AdditionalBillingLogiqRetrieve operation. Contains the response
- * data from a single resource get operation.
- */
-public final class AdditionalBillingLogiqRetrieveResponse extends BaseResponse {
-  private final Object additionalBillingLogiq;
-
-  private AdditionalBillingLogiqRetrieveResponse(
-      Object additionalBillingLogiq, Response httpResponse) {
-    super(httpResponse);
-
-    this.additionalBillingLogiq = additionalBillingLogiq;
-  }
-
-  /** Parse JSON response into AdditionalBillingLogiqRetrieveResponse object. */
-  public static AdditionalBillingLogiqRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into AdditionalBillingLogiqRetrieveResponse object with HTTP response. */
-  public static AdditionalBillingLogiqRetrieveResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      Object additionalBillingLogiq = JsonUtil.getObject(json, "additional_billing_logiq");
-
-      return new AdditionalBillingLogiqRetrieveResponse(additionalBillingLogiq, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse AdditionalBillingLogiqRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the additionalBillingLogiq from the response. */
-  public Object getAdditionalBillingLogiq() {
-    return additionalBillingLogiq;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/addon/AddonRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/addon/AddonRetrieveResponse.java
deleted file mode 100644
index 958e768c..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/addon/AddonRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.addon;
-
-import com.chargebee.v4.core.models.addon.Addon;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for AddonRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class AddonRetrieveResponse extends BaseResponse {
-  private final Addon addon;
-
-  private AddonRetrieveResponse(Addon addon, Response httpResponse) {
-    super(httpResponse);
-
-    this.addon = addon;
-  }
-
-  /** Parse JSON response into AddonRetrieveResponse object. */
-  public static AddonRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into AddonRetrieveResponse object with HTTP response. */
-  public static AddonRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Addon addon = Addon.fromJson(JsonUtil.getObject(json, "addon"));
-
-      return new AddonRetrieveResponse(addon, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse AddonRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the addon from the response. */
-  public Addon getAddon() {
-    return addon;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/address/AddressRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/address/AddressRetrieveResponse.java
deleted file mode 100644
index 766adaed..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/address/AddressRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.address;
-
-import com.chargebee.v4.core.models.address.Address;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for AddressRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class AddressRetrieveResponse extends BaseResponse {
-  private final Address address;
-
-  private AddressRetrieveResponse(Address address, Response httpResponse) {
-    super(httpResponse);
-
-    this.address = address;
-  }
-
-  /** Parse JSON response into AddressRetrieveResponse object. */
-  public static AddressRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into AddressRetrieveResponse object with HTTP response. */
-  public static AddressRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Address address = Address.fromJson(JsonUtil.getObject(json, "address"));
-
-      return new AddressRetrieveResponse(address, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse AddressRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the address from the response. */
-  public Address getAddress() {
-    return address;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemRetrieveResponse.java
deleted file mode 100644
index 4da187fa..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.attachedItem;
-
-import com.chargebee.v4.core.models.attachedItem.AttachedItem;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for AttachedItemRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class AttachedItemRetrieveResponse extends BaseResponse {
-  private final AttachedItem attachedItem;
-
-  private AttachedItemRetrieveResponse(AttachedItem attachedItem, Response httpResponse) {
-    super(httpResponse);
-
-    this.attachedItem = attachedItem;
-  }
-
-  /** Parse JSON response into AttachedItemRetrieveResponse object. */
-  public static AttachedItemRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into AttachedItemRetrieveResponse object with HTTP response. */
-  public static AttachedItemRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      AttachedItem attachedItem = AttachedItem.fromJson(JsonUtil.getObject(json, "attached_item"));
-
-      return new AttachedItemRetrieveResponse(attachedItem, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse AttachedItemRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the attachedItem from the response. */
-  public AttachedItem getAttachedItem() {
-    return attachedItem;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/brandConfiguration/BrandConfigurationRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/brandConfiguration/BrandConfigurationRetrieveResponse.java
deleted file mode 100644
index b675f75a..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/brandConfiguration/BrandConfigurationRetrieveResponse.java
+++ /dev/null
@@ -1,41 +0,0 @@
-package com.chargebee.v4.core.responses.brandConfiguration;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for BrandConfigurationRetrieve operation. Contains the response data
- * from a single resource get operation.
- */
-public final class BrandConfigurationRetrieveResponse extends BaseResponse {
-  private final Object brandConfiguration;
-
-  private BrandConfigurationRetrieveResponse(Object brandConfiguration, Response httpResponse) {
-    super(httpResponse);
-
-    this.brandConfiguration = brandConfiguration;
-  }
-
-  /** Parse JSON response into BrandConfigurationRetrieveResponse object. */
-  public static BrandConfigurationRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into BrandConfigurationRetrieveResponse object with HTTP response. */
-  public static BrandConfigurationRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Object brandConfiguration = JsonUtil.getObject(json, "brand_configuration");
-
-      return new BrandConfigurationRetrieveResponse(brandConfiguration, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse BrandConfigurationRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the brandConfiguration from the response. */
-  public Object getBrandConfiguration() {
-    return brandConfiguration;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/businessProfile/BusinessProfileRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/businessProfile/BusinessProfileRetrieveResponse.java
deleted file mode 100644
index f5499dd1..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/businessProfile/BusinessProfileRetrieveResponse.java
+++ /dev/null
@@ -1,41 +0,0 @@
-package com.chargebee.v4.core.responses.businessProfile;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for BusinessProfileRetrieve operation. Contains the response data from
- * a single resource get operation.
- */
-public final class BusinessProfileRetrieveResponse extends BaseResponse {
-  private final Object businessProfile;
-
-  private BusinessProfileRetrieveResponse(Object businessProfile, Response httpResponse) {
-    super(httpResponse);
-
-    this.businessProfile = businessProfile;
-  }
-
-  /** Parse JSON response into BusinessProfileRetrieveResponse object. */
-  public static BusinessProfileRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into BusinessProfileRetrieveResponse object with HTTP response. */
-  public static BusinessProfileRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Object businessProfile = JsonUtil.getObject(json, "business_profile");
-
-      return new BusinessProfileRetrieveResponse(businessProfile, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse BusinessProfileRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the businessProfile from the response. */
-  public Object getBusinessProfile() {
-    return businessProfile;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/card/CardCopyCardForCustomerResponse.java b/src/main/java/com/chargebee/v4/core/responses/card/CardCopyCardForCustomerResponse.java
deleted file mode 100644
index 9381a840..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/card/CardCopyCardForCustomerResponse.java
+++ /dev/null
@@ -1,78 +0,0 @@
-package com.chargebee.v4.core.responses.card;
-
-import com.chargebee.v4.core.models.thirdPartyPaymentMethod.ThirdPartyPaymentMethod;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for CardCopyCardForCustomer operation. Contains the response data from
- * the API.
- */
-public final class CardCopyCardForCustomerResponse extends BaseResponse {
-  private final ThirdPartyPaymentMethod thirdPartyPaymentMethod;
-
-  private CardCopyCardForCustomerResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.thirdPartyPaymentMethod = builder.thirdPartyPaymentMethod;
-  }
-
-  /** Parse JSON response into CardCopyCardForCustomerResponse object. */
-  public static CardCopyCardForCustomerResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CardCopyCardForCustomerResponse object with HTTP response. */
-  public static CardCopyCardForCustomerResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __thirdPartyPaymentMethodJson = JsonUtil.getObject(json, "third_party_payment_method");
-      if (__thirdPartyPaymentMethodJson != null) {
-        builder.thirdPartyPaymentMethod(
-            ThirdPartyPaymentMethod.fromJson(__thirdPartyPaymentMethodJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CardCopyCardForCustomerResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for CardCopyCardForCustomerResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for CardCopyCardForCustomerResponse. */
-  public static class Builder {
-
-    private ThirdPartyPaymentMethod thirdPartyPaymentMethod;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder thirdPartyPaymentMethod(ThirdPartyPaymentMethod thirdPartyPaymentMethod) {
-      this.thirdPartyPaymentMethod = thirdPartyPaymentMethod;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public CardCopyCardForCustomerResponse build() {
-      return new CardCopyCardForCustomerResponse(this);
-    }
-  }
-
-  /** Get the thirdPartyPaymentMethod from the response. */
-  public ThirdPartyPaymentMethod getThirdPartyPaymentMethod() {
-    return thirdPartyPaymentMethod;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/card/CardDeleteCardForCustomerResponse.java b/src/main/java/com/chargebee/v4/core/responses/card/CardDeleteCardForCustomerResponse.java
deleted file mode 100644
index 2b402be5..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/card/CardDeleteCardForCustomerResponse.java
+++ /dev/null
@@ -1,77 +0,0 @@
-package com.chargebee.v4.core.responses.card;
-
-import com.chargebee.v4.core.models.customer.Customer;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for CardDeleteCardForCustomer operation. Contains the response data
- * from the API.
- */
-public final class CardDeleteCardForCustomerResponse extends BaseResponse {
-  private final Customer customer;
-
-  private CardDeleteCardForCustomerResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.customer = builder.customer;
-  }
-
-  /** Parse JSON response into CardDeleteCardForCustomerResponse object. */
-  public static CardDeleteCardForCustomerResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CardDeleteCardForCustomerResponse object with HTTP response. */
-  public static CardDeleteCardForCustomerResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __customerJson = JsonUtil.getObject(json, "customer");
-      if (__customerJson != null) {
-        builder.customer(Customer.fromJson(__customerJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CardDeleteCardForCustomerResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for CardDeleteCardForCustomerResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for CardDeleteCardForCustomerResponse. */
-  public static class Builder {
-
-    private Customer customer;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder customer(Customer customer) {
-      this.customer = customer;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public CardDeleteCardForCustomerResponse build() {
-      return new CardDeleteCardForCustomerResponse(this);
-    }
-  }
-
-  /** Get the customer from the response. */
-  public Customer getCustomer() {
-    return customer;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/card/CardRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/card/CardRetrieveResponse.java
deleted file mode 100644
index e355d2dc..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/card/CardRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.card;
-
-import com.chargebee.v4.core.models.card.Card;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for CardRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class CardRetrieveResponse extends BaseResponse {
-  private final Card card;
-
-  private CardRetrieveResponse(Card card, Response httpResponse) {
-    super(httpResponse);
-
-    this.card = card;
-  }
-
-  /** Parse JSON response into CardRetrieveResponse object. */
-  public static CardRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CardRetrieveResponse object with HTTP response. */
-  public static CardRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Card card = Card.fromJson(JsonUtil.getObject(json, "card"));
-
-      return new CardRetrieveResponse(card, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CardRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the card from the response. */
-  public Card getCard() {
-    return card;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/card/CardUpdateCardForCustomerResponse.java b/src/main/java/com/chargebee/v4/core/responses/card/CardUpdateCardForCustomerResponse.java
deleted file mode 100644
index 7ebfd1db..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/card/CardUpdateCardForCustomerResponse.java
+++ /dev/null
@@ -1,100 +0,0 @@
-package com.chargebee.v4.core.responses.card;
-
-import com.chargebee.v4.core.models.customer.Customer;
-
-import com.chargebee.v4.core.models.card.Card;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for CardUpdateCardForCustomer operation. Contains the response data
- * from the API.
- */
-public final class CardUpdateCardForCustomerResponse extends BaseResponse {
-  private final Customer customer;
-
-  private final Card card;
-
-  private CardUpdateCardForCustomerResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.customer = builder.customer;
-
-    this.card = builder.card;
-  }
-
-  /** Parse JSON response into CardUpdateCardForCustomerResponse object. */
-  public static CardUpdateCardForCustomerResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CardUpdateCardForCustomerResponse object with HTTP response. */
-  public static CardUpdateCardForCustomerResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __customerJson = JsonUtil.getObject(json, "customer");
-      if (__customerJson != null) {
-        builder.customer(Customer.fromJson(__customerJson));
-      }
-
-      String __cardJson = JsonUtil.getObject(json, "card");
-      if (__cardJson != null) {
-        builder.card(Card.fromJson(__cardJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CardUpdateCardForCustomerResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for CardUpdateCardForCustomerResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for CardUpdateCardForCustomerResponse. */
-  public static class Builder {
-
-    private Customer customer;
-
-    private Card card;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder customer(Customer customer) {
-      this.customer = customer;
-      return this;
-    }
-
-    public Builder card(Card card) {
-      this.card = card;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public CardUpdateCardForCustomerResponse build() {
-      return new CardUpdateCardForCustomerResponse(this);
-    }
-  }
-
-  /** Get the customer from the response. */
-  public Customer getCustomer() {
-    return customer;
-  }
-
-  /** Get the card from the response. */
-  public Card getCard() {
-    return card;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/comment/CommentRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/comment/CommentRetrieveResponse.java
deleted file mode 100644
index 141bc584..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/comment/CommentRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.comment;
-
-import com.chargebee.v4.core.models.comment.Comment;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for CommentRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class CommentRetrieveResponse extends BaseResponse {
-  private final Comment comment;
-
-  private CommentRetrieveResponse(Comment comment, Response httpResponse) {
-    super(httpResponse);
-
-    this.comment = comment;
-  }
-
-  /** Parse JSON response into CommentRetrieveResponse object. */
-  public static CommentRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CommentRetrieveResponse object with HTTP response. */
-  public static CommentRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Comment comment = Comment.fromJson(JsonUtil.getObject(json, "comment"));
-
-      return new CommentRetrieveResponse(comment, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CommentRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the comment from the response. */
-  public Comment getComment() {
-    return comment;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/configuration/ConfigurationListResponse.java b/src/main/java/com/chargebee/v4/core/responses/configuration/ConfigurationListResponse.java
deleted file mode 100644
index 848dc1cb..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/configuration/ConfigurationListResponse.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.chargebee.v4.core.responses.configuration;
-
-import com.chargebee.v4.core.models.configuration.Configuration;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import java.util.List;
-
-/**
- * Immutable response object for ConfigurationList operation. Contains the response data from a
- * single resource get operation.
- */
-public final class ConfigurationListResponse extends BaseResponse {
-  private final List<Configuration> configurations;
-
-  private ConfigurationListResponse(List<Configuration> configurations, Response httpResponse) {
-    super(httpResponse);
-
-    this.configurations = configurations;
-  }
-
-  /** Parse JSON response into ConfigurationListResponse object. */
-  public static ConfigurationListResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into ConfigurationListResponse object with HTTP response. */
-  public static ConfigurationListResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      List<Configuration> configurations =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "configurations")).stream()
-              .map(Configuration::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      return new ConfigurationListResponse(configurations, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse ConfigurationListResponse from JSON", e);
-    }
-  }
-
-  /** Get the configurations from the response. */
-  public List<Configuration> getConfigurations() {
-    return configurations;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/coupon/CouponRetrieveResponse.java
deleted file mode 100644
index 0edbb534..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.coupon;
-
-import com.chargebee.v4.core.models.coupon.Coupon;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for CouponRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class CouponRetrieveResponse extends BaseResponse {
-  private final Coupon coupon;
-
-  private CouponRetrieveResponse(Coupon coupon, Response httpResponse) {
-    super(httpResponse);
-
-    this.coupon = coupon;
-  }
-
-  /** Parse JSON response into CouponRetrieveResponse object. */
-  public static CouponRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CouponRetrieveResponse object with HTTP response. */
-  public static CouponRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Coupon coupon = Coupon.fromJson(JsonUtil.getObject(json, "coupon"));
-
-      return new CouponRetrieveResponse(coupon, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CouponRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the coupon from the response. */
-  public Coupon getCoupon() {
-    return coupon;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/couponCode/CouponCodeRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/couponCode/CouponCodeRetrieveResponse.java
deleted file mode 100644
index 45081f51..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/couponCode/CouponCodeRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.couponCode;
-
-import com.chargebee.v4.core.models.couponCode.CouponCode;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for CouponCodeRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class CouponCodeRetrieveResponse extends BaseResponse {
-  private final CouponCode couponCode;
-
-  private CouponCodeRetrieveResponse(CouponCode couponCode, Response httpResponse) {
-    super(httpResponse);
-
-    this.couponCode = couponCode;
-  }
-
-  /** Parse JSON response into CouponCodeRetrieveResponse object. */
-  public static CouponCodeRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CouponCodeRetrieveResponse object with HTTP response. */
-  public static CouponCodeRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      CouponCode couponCode = CouponCode.fromJson(JsonUtil.getObject(json, "coupon_code"));
-
-      return new CouponCodeRetrieveResponse(couponCode, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CouponCodeRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the couponCode from the response. */
-  public CouponCode getCouponCode() {
-    return couponCode;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetRetrieveResponse.java
deleted file mode 100644
index f55480ba..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.couponSet;
-
-import com.chargebee.v4.core.models.couponSet.CouponSet;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for CouponSetRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class CouponSetRetrieveResponse extends BaseResponse {
-  private final CouponSet couponSet;
-
-  private CouponSetRetrieveResponse(CouponSet couponSet, Response httpResponse) {
-    super(httpResponse);
-
-    this.couponSet = couponSet;
-  }
-
-  /** Parse JSON response into CouponSetRetrieveResponse object. */
-  public static CouponSetRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CouponSetRetrieveResponse object with HTTP response. */
-  public static CouponSetRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      CouponSet couponSet = CouponSet.fromJson(JsonUtil.getObject(json, "coupon_set"));
-
-      return new CouponSetRetrieveResponse(couponSet, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CouponSetRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the couponSet from the response. */
-  public CouponSet getCouponSet() {
-    return couponSet;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteCreditNotesForCustomerResponse.java b/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteCreditNotesForCustomerResponse.java
deleted file mode 100644
index fbdc9ac7..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteCreditNotesForCustomerResponse.java
+++ /dev/null
@@ -1,178 +0,0 @@
-package com.chargebee.v4.core.responses.creditNote;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.creditNote.CreditNote;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.CreditNoteService;
-import com.chargebee.v4.core.models.creditNote.params.CreditNoteCreditNotesForCustomerParams;
-
-/**
- * Immutable response object for CreditNoteCreditNotesForCustomer operation. Contains paginated list
- * data.
- */
-public final class CreditNoteCreditNotesForCustomerResponse {
-
-  private final List<CreditNoteCreditNotesForCustomerItem> list;
-
-  private final String nextOffset;
-
-  private final String customerId;
-
-  private final CreditNoteService service;
-  private final CreditNoteCreditNotesForCustomerParams originalParams;
-  private final Response httpResponse;
-
-  private CreditNoteCreditNotesForCustomerResponse(
-      List<CreditNoteCreditNotesForCustomerItem> list,
-      String nextOffset,
-      String customerId,
-      CreditNoteService service,
-      CreditNoteCreditNotesForCustomerParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.customerId = customerId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into CreditNoteCreditNotesForCustomerResponse object (no service context).
-   * Use this when you only need to read a single page (no nextPage()).
-   */
-  public static CreditNoteCreditNotesForCustomerResponse fromJson(String json) {
-    try {
-
-      List<CreditNoteCreditNotesForCustomerItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(CreditNoteCreditNotesForCustomerItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new CreditNoteCreditNotesForCustomerResponse(list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse CreditNoteCreditNotesForCustomerResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into CreditNoteCreditNotesForCustomerResponse object with service context
-   * for pagination (enables nextPage()).
-   */
-  public static CreditNoteCreditNotesForCustomerResponse fromJson(
-      String json,
-      CreditNoteService service,
-      CreditNoteCreditNotesForCustomerParams originalParams,
-      String customerId,
-      Response httpResponse) {
-    try {
-
-      List<CreditNoteCreditNotesForCustomerItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(CreditNoteCreditNotesForCustomerItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new CreditNoteCreditNotesForCustomerResponse(
-          list, nextOffset, customerId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse CreditNoteCreditNotesForCustomerResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<CreditNoteCreditNotesForCustomerItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public CreditNoteCreditNotesForCustomerResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    CreditNoteCreditNotesForCustomerParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : CreditNoteCreditNotesForCustomerParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.creditNotesForCustomer(customerId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class CreditNoteCreditNotesForCustomerItem {
-
-    private CreditNote creditNote;
-
-    public CreditNote getCreditNote() {
-      return creditNote;
-    }
-
-    public static CreditNoteCreditNotesForCustomerItem fromJson(String json) {
-      CreditNoteCreditNotesForCustomerItem item = new CreditNoteCreditNotesForCustomerItem();
-
-      String __creditNoteJson = JsonUtil.getObject(json, "credit_note");
-      if (__creditNoteJson != null) {
-        item.creditNote = CreditNote.fromJson(__creditNoteJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteDownloadEinvoiceResponse.java b/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteDownloadEinvoiceResponse.java
deleted file mode 100644
index ad5f0999..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteDownloadEinvoiceResponse.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.chargebee.v4.core.responses.creditNote;
-
-import com.chargebee.v4.core.models.download.Download;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import java.util.List;
-
-/**
- * Immutable response object for CreditNoteDownloadEinvoice operation. Contains the response data
- * from a single resource get operation.
- */
-public final class CreditNoteDownloadEinvoiceResponse extends BaseResponse {
-  private final List<Download> downloads;
-
-  private CreditNoteDownloadEinvoiceResponse(List<Download> downloads, Response httpResponse) {
-    super(httpResponse);
-
-    this.downloads = downloads;
-  }
-
-  /** Parse JSON response into CreditNoteDownloadEinvoiceResponse object. */
-  public static CreditNoteDownloadEinvoiceResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CreditNoteDownloadEinvoiceResponse object with HTTP response. */
-  public static CreditNoteDownloadEinvoiceResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      List<Download> downloads =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "downloads")).stream()
-              .map(Download::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      return new CreditNoteDownloadEinvoiceResponse(downloads, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CreditNoteDownloadEinvoiceResponse from JSON", e);
-    }
-  }
-
-  /** Get the downloads from the response. */
-  public List<Download> getDownloads() {
-    return downloads;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteImportCreditNoteResponse.java b/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteImportCreditNoteResponse.java
deleted file mode 100644
index 3331025a..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteImportCreditNoteResponse.java
+++ /dev/null
@@ -1,77 +0,0 @@
-package com.chargebee.v4.core.responses.creditNote;
-
-import com.chargebee.v4.core.models.creditNote.CreditNote;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for CreditNoteImportCreditNote operation. Contains the response data
- * from the API.
- */
-public final class CreditNoteImportCreditNoteResponse extends BaseResponse {
-  private final CreditNote creditNote;
-
-  private CreditNoteImportCreditNoteResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.creditNote = builder.creditNote;
-  }
-
-  /** Parse JSON response into CreditNoteImportCreditNoteResponse object. */
-  public static CreditNoteImportCreditNoteResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CreditNoteImportCreditNoteResponse object with HTTP response. */
-  public static CreditNoteImportCreditNoteResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __creditNoteJson = JsonUtil.getObject(json, "credit_note");
-      if (__creditNoteJson != null) {
-        builder.creditNote(CreditNote.fromJson(__creditNoteJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CreditNoteImportCreditNoteResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for CreditNoteImportCreditNoteResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for CreditNoteImportCreditNoteResponse. */
-  public static class Builder {
-
-    private CreditNote creditNote;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder creditNote(CreditNote creditNote) {
-      this.creditNote = creditNote;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public CreditNoteImportCreditNoteResponse build() {
-      return new CreditNoteImportCreditNoteResponse(this);
-    }
-  }
-
-  /** Get the creditNote from the response. */
-  public CreditNote getCreditNote() {
-    return creditNote;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteRetrieveResponse.java
deleted file mode 100644
index 7ac5d79a..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.creditNote;
-
-import com.chargebee.v4.core.models.creditNote.CreditNote;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for CreditNoteRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class CreditNoteRetrieveResponse extends BaseResponse {
-  private final CreditNote creditNote;
-
-  private CreditNoteRetrieveResponse(CreditNote creditNote, Response httpResponse) {
-    super(httpResponse);
-
-    this.creditNote = creditNote;
-  }
-
-  /** Parse JSON response into CreditNoteRetrieveResponse object. */
-  public static CreditNoteRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CreditNoteRetrieveResponse object with HTTP response. */
-  public static CreditNoteRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      CreditNote creditNote = CreditNote.fromJson(JsonUtil.getObject(json, "credit_note"));
-
-      return new CreditNoteRetrieveResponse(creditNote, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CreditNoteRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the creditNote from the response. */
-  public CreditNote getCreditNote() {
-    return creditNote;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteVoidCreditNoteResponse.java b/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteVoidCreditNoteResponse.java
deleted file mode 100644
index b6b15706..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteVoidCreditNoteResponse.java
+++ /dev/null
@@ -1,77 +0,0 @@
-package com.chargebee.v4.core.responses.creditNote;
-
-import com.chargebee.v4.core.models.creditNote.CreditNote;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for CreditNoteVoidCreditNote operation. Contains the response data from
- * the API.
- */
-public final class CreditNoteVoidCreditNoteResponse extends BaseResponse {
-  private final CreditNote creditNote;
-
-  private CreditNoteVoidCreditNoteResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.creditNote = builder.creditNote;
-  }
-
-  /** Parse JSON response into CreditNoteVoidCreditNoteResponse object. */
-  public static CreditNoteVoidCreditNoteResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CreditNoteVoidCreditNoteResponse object with HTTP response. */
-  public static CreditNoteVoidCreditNoteResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __creditNoteJson = JsonUtil.getObject(json, "credit_note");
-      if (__creditNoteJson != null) {
-        builder.creditNote(CreditNote.fromJson(__creditNoteJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CreditNoteVoidCreditNoteResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for CreditNoteVoidCreditNoteResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for CreditNoteVoidCreditNoteResponse. */
-  public static class Builder {
-
-    private CreditNote creditNote;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder creditNote(CreditNote creditNote) {
-      this.creditNote = creditNote;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public CreditNoteVoidCreditNoteResponse build() {
-      return new CreditNoteVoidCreditNoteResponse(this);
-    }
-  }
-
-  /** Get the creditNote from the response. */
-  public CreditNote getCreditNote() {
-    return creditNote;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/currency/CurrencyRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/currency/CurrencyRetrieveResponse.java
deleted file mode 100644
index 00040440..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/currency/CurrencyRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.currency;
-
-import com.chargebee.v4.core.models.currency.Currency;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for CurrencyRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class CurrencyRetrieveResponse extends BaseResponse {
-  private final Currency currency;
-
-  private CurrencyRetrieveResponse(Currency currency, Response httpResponse) {
-    super(httpResponse);
-
-    this.currency = currency;
-  }
-
-  /** Parse JSON response into CurrencyRetrieveResponse object. */
-  public static CurrencyRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CurrencyRetrieveResponse object with HTTP response. */
-  public static CurrencyRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Currency currency = Currency.fromJson(JsonUtil.getObject(json, "currency"));
-
-      return new CurrencyRetrieveResponse(currency, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CurrencyRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the currency from the response. */
-  public Currency getCurrency() {
-    return currency;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerContactsForCustomerResponse.java b/src/main/java/com/chargebee/v4/core/responses/customer/CustomerContactsForCustomerResponse.java
deleted file mode 100644
index e062b283..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerContactsForCustomerResponse.java
+++ /dev/null
@@ -1,178 +0,0 @@
-package com.chargebee.v4.core.responses.customer;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.contact.Contact;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.CustomerService;
-import com.chargebee.v4.core.models.customer.params.CustomerContactsForCustomerParams;
-
-/**
- * Immutable response object for CustomerContactsForCustomer operation. Contains paginated list
- * data.
- */
-public final class CustomerContactsForCustomerResponse {
-
-  private final List<CustomerContactsForCustomerItem> list;
-
-  private final String nextOffset;
-
-  private final String customerId;
-
-  private final CustomerService service;
-  private final CustomerContactsForCustomerParams originalParams;
-  private final Response httpResponse;
-
-  private CustomerContactsForCustomerResponse(
-      List<CustomerContactsForCustomerItem> list,
-      String nextOffset,
-      String customerId,
-      CustomerService service,
-      CustomerContactsForCustomerParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.customerId = customerId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into CustomerContactsForCustomerResponse object (no service context). Use
-   * this when you only need to read a single page (no nextPage()).
-   */
-  public static CustomerContactsForCustomerResponse fromJson(String json) {
-    try {
-
-      List<CustomerContactsForCustomerItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(CustomerContactsForCustomerItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new CustomerContactsForCustomerResponse(list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse CustomerContactsForCustomerResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into CustomerContactsForCustomerResponse object with service context for
-   * pagination (enables nextPage()).
-   */
-  public static CustomerContactsForCustomerResponse fromJson(
-      String json,
-      CustomerService service,
-      CustomerContactsForCustomerParams originalParams,
-      String customerId,
-      Response httpResponse) {
-    try {
-
-      List<CustomerContactsForCustomerItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(CustomerContactsForCustomerItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new CustomerContactsForCustomerResponse(
-          list, nextOffset, customerId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse CustomerContactsForCustomerResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<CustomerContactsForCustomerItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public CustomerContactsForCustomerResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    CustomerContactsForCustomerParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : CustomerContactsForCustomerParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.contactsForCustomer(customerId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class CustomerContactsForCustomerItem {
-
-    private Contact contact;
-
-    public Contact getContact() {
-      return contact;
-    }
-
-    public static CustomerContactsForCustomerItem fromJson(String json) {
-      CustomerContactsForCustomerItem item = new CustomerContactsForCustomerItem();
-
-      String __contactJson = JsonUtil.getObject(json, "contact");
-      if (__contactJson != null) {
-        item.contact = Contact.fromJson(__contactJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerHierarchyResponse.java b/src/main/java/com/chargebee/v4/core/responses/customer/CustomerHierarchyResponse.java
deleted file mode 100644
index 9ae73e15..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerHierarchyResponse.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.chargebee.v4.core.responses.customer;
-
-import com.chargebee.v4.core.models.hierarchy.Hierarchy;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import java.util.List;
-
-/**
- * Immutable response object for CustomerHierarchy operation. Contains the response data from a
- * single resource get operation.
- */
-public final class CustomerHierarchyResponse extends BaseResponse {
-  private final List<Hierarchy> hierarchies;
-
-  private CustomerHierarchyResponse(List<Hierarchy> hierarchies, Response httpResponse) {
-    super(httpResponse);
-
-    this.hierarchies = hierarchies;
-  }
-
-  /** Parse JSON response into CustomerHierarchyResponse object. */
-  public static CustomerHierarchyResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CustomerHierarchyResponse object with HTTP response. */
-  public static CustomerHierarchyResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      List<Hierarchy> hierarchies =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "hierarchies")).stream()
-              .map(Hierarchy::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      return new CustomerHierarchyResponse(hierarchies, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CustomerHierarchyResponse from JSON", e);
-    }
-  }
-
-  /** Get the hierarchies from the response. */
-  public List<Hierarchy> getHierarchies() {
-    return hierarchies;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/customer/CustomerRetrieveResponse.java
deleted file mode 100644
index 8468ef3b..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerRetrieveResponse.java
+++ /dev/null
@@ -1,56 +0,0 @@
-package com.chargebee.v4.core.responses.customer;
-
-import com.chargebee.v4.core.models.customer.Customer;
-
-import com.chargebee.v4.core.models.card.Card;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for CustomerRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class CustomerRetrieveResponse extends BaseResponse {
-  private final Customer customer;
-
-  private final Card card;
-
-  private CustomerRetrieveResponse(Customer customer, Card card, Response httpResponse) {
-    super(httpResponse);
-
-    this.customer = customer;
-
-    this.card = card;
-  }
-
-  /** Parse JSON response into CustomerRetrieveResponse object. */
-  public static CustomerRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into CustomerRetrieveResponse object with HTTP response. */
-  public static CustomerRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Customer customer = Customer.fromJson(JsonUtil.getObject(json, "customer"));
-
-      Card card = Card.fromJson(JsonUtil.getObject(json, "card"));
-
-      return new CustomerRetrieveResponse(customer, card, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse CustomerRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the customer from the response. */
-  public Customer getCustomer() {
-    return customer;
-  }
-
-  /** Get the card from the response. */
-  public Card getCard() {
-    return card;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceRetrieveResponse.java
deleted file mode 100644
index a96f2362..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceRetrieveResponse.java
+++ /dev/null
@@ -1,45 +0,0 @@
-package com.chargebee.v4.core.responses.differentialPrice;
-
-import com.chargebee.v4.core.models.differentialPrice.DifferentialPrice;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for DifferentialPriceRetrieve operation. Contains the response data
- * from a single resource get operation.
- */
-public final class DifferentialPriceRetrieveResponse extends BaseResponse {
-  private final DifferentialPrice differentialPrice;
-
-  private DifferentialPriceRetrieveResponse(
-      DifferentialPrice differentialPrice, Response httpResponse) {
-    super(httpResponse);
-
-    this.differentialPrice = differentialPrice;
-  }
-
-  /** Parse JSON response into DifferentialPriceRetrieveResponse object. */
-  public static DifferentialPriceRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into DifferentialPriceRetrieveResponse object with HTTP response. */
-  public static DifferentialPriceRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      DifferentialPrice differentialPrice =
-          DifferentialPrice.fromJson(JsonUtil.getObject(json, "differential_price"));
-
-      return new DifferentialPriceRetrieveResponse(differentialPrice, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse DifferentialPriceRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the differentialPrice from the response. */
-  public DifferentialPrice getDifferentialPrice() {
-    return differentialPrice;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/entitlementOverride/EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse.java b/src/main/java/com/chargebee/v4/core/responses/entitlementOverride/EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse.java
deleted file mode 100644
index 50ec19fe..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/entitlementOverride/EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse.java
+++ /dev/null
@@ -1,90 +0,0 @@
-package com.chargebee.v4.core.responses.entitlementOverride;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.entitlementOverride.EntitlementOverride;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for EntitlementOverrideAddEntitlementOverrideForSubscription operation.
- * Contains the response data from the API.
- */
-public final class EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse
-    extends BaseResponse {
-  private final List<EntitlementOverride> list;
-
-  private EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.list = builder.list;
-  }
-
-  /**
-   * Parse JSON response into EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse
-   * object.
-   */
-  public static EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse fromJson(
-      String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse
-   * object with HTTP response.
-   */
-  public static EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      builder.list(
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(EntitlementOverride::fromJson)
-              .collect(java.util.stream.Collectors.toList()));
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse from JSON",
-          e);
-    }
-  }
-
-  /** Create a new builder for EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse. */
-  public static class Builder {
-
-    private List<EntitlementOverride> list;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder list(List<EntitlementOverride> list) {
-      this.list = list;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse build() {
-      return new EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse(this);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<EntitlementOverride> getList() {
-    return list;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/entitlementOverride/EntitlementOverrideListEntitlementOverrideForSubscriptionResponse.java b/src/main/java/com/chargebee/v4/core/responses/entitlementOverride/EntitlementOverrideListEntitlementOverrideForSubscriptionResponse.java
deleted file mode 100644
index e6865275..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/entitlementOverride/EntitlementOverrideListEntitlementOverrideForSubscriptionResponse.java
+++ /dev/null
@@ -1,185 +0,0 @@
-package com.chargebee.v4.core.responses.entitlementOverride;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.entitlementOverride.EntitlementOverride;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.EntitlementOverrideService;
-import com.chargebee.v4.core.models.entitlementOverride.params.EntitlementOverrideListEntitlementOverrideForSubscriptionParams;
-
-/**
- * Immutable response object for EntitlementOverrideListEntitlementOverrideForSubscription
- * operation. Contains paginated list data.
- */
-public final class EntitlementOverrideListEntitlementOverrideForSubscriptionResponse {
-
-  private final List<EntitlementOverrideListEntitlementOverrideForSubscriptionItem> list;
-
-  private final String nextOffset;
-
-  private final String subscriptionId;
-
-  private final EntitlementOverrideService service;
-  private final EntitlementOverrideListEntitlementOverrideForSubscriptionParams originalParams;
-  private final Response httpResponse;
-
-  private EntitlementOverrideListEntitlementOverrideForSubscriptionResponse(
-      List<EntitlementOverrideListEntitlementOverrideForSubscriptionItem> list,
-      String nextOffset,
-      String subscriptionId,
-      EntitlementOverrideService service,
-      EntitlementOverrideListEntitlementOverrideForSubscriptionParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.subscriptionId = subscriptionId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into EntitlementOverrideListEntitlementOverrideForSubscriptionResponse
-   * object (no service context). Use this when you only need to read a single page (no nextPage()).
-   */
-  public static EntitlementOverrideListEntitlementOverrideForSubscriptionResponse fromJson(
-      String json) {
-    try {
-
-      List<EntitlementOverrideListEntitlementOverrideForSubscriptionItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(EntitlementOverrideListEntitlementOverrideForSubscriptionItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new EntitlementOverrideListEntitlementOverrideForSubscriptionResponse(
-          list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse EntitlementOverrideListEntitlementOverrideForSubscriptionResponse from JSON",
-          e);
-    }
-  }
-
-  /**
-   * Parse JSON response into EntitlementOverrideListEntitlementOverrideForSubscriptionResponse
-   * object with service context for pagination (enables nextPage()).
-   */
-  public static EntitlementOverrideListEntitlementOverrideForSubscriptionResponse fromJson(
-      String json,
-      EntitlementOverrideService service,
-      EntitlementOverrideListEntitlementOverrideForSubscriptionParams originalParams,
-      String subscriptionId,
-      Response httpResponse) {
-    try {
-
-      List<EntitlementOverrideListEntitlementOverrideForSubscriptionItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(EntitlementOverrideListEntitlementOverrideForSubscriptionItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new EntitlementOverrideListEntitlementOverrideForSubscriptionResponse(
-          list, nextOffset, subscriptionId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse EntitlementOverrideListEntitlementOverrideForSubscriptionResponse from JSON",
-          e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<EntitlementOverrideListEntitlementOverrideForSubscriptionItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public EntitlementOverrideListEntitlementOverrideForSubscriptionResponse nextPage()
-      throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    EntitlementOverrideListEntitlementOverrideForSubscriptionParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : EntitlementOverrideListEntitlementOverrideForSubscriptionParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.listEntitlementOverrideForSubscription(subscriptionId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class EntitlementOverrideListEntitlementOverrideForSubscriptionItem {
-
-    private EntitlementOverride entitlementOverride;
-
-    public EntitlementOverride getEntitlementOverride() {
-      return entitlementOverride;
-    }
-
-    public static EntitlementOverrideListEntitlementOverrideForSubscriptionItem fromJson(
-        String json) {
-      EntitlementOverrideListEntitlementOverrideForSubscriptionItem item =
-          new EntitlementOverrideListEntitlementOverrideForSubscriptionItem();
-
-      String __entitlementOverrideJson = JsonUtil.getObject(json, "entitlement_override");
-      if (__entitlementOverrideJson != null) {
-        item.entitlementOverride = EntitlementOverride.fromJson(__entitlementOverrideJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateAdvanceInvoiceEstimateResponse.java b/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateAdvanceInvoiceEstimateResponse.java
deleted file mode 100644
index 8dace56f..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateAdvanceInvoiceEstimateResponse.java
+++ /dev/null
@@ -1,79 +0,0 @@
-package com.chargebee.v4.core.responses.estimate;
-
-import com.chargebee.v4.core.models.estimate.Estimate;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for EstimateAdvanceInvoiceEstimate operation. Contains the response
- * data from the API.
- */
-public final class EstimateAdvanceInvoiceEstimateResponse extends BaseResponse {
-  private final Estimate estimate;
-
-  private EstimateAdvanceInvoiceEstimateResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.estimate = builder.estimate;
-  }
-
-  /** Parse JSON response into EstimateAdvanceInvoiceEstimateResponse object. */
-  public static EstimateAdvanceInvoiceEstimateResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into EstimateAdvanceInvoiceEstimateResponse object with HTTP response. */
-  public static EstimateAdvanceInvoiceEstimateResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __estimateJson = JsonUtil.getObject(json, "estimate");
-      if (__estimateJson != null) {
-        builder.estimate(Estimate.fromJson(__estimateJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse EstimateAdvanceInvoiceEstimateResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for EstimateAdvanceInvoiceEstimateResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for EstimateAdvanceInvoiceEstimateResponse. */
-  public static class Builder {
-
-    private Estimate estimate;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder estimate(Estimate estimate) {
-      this.estimate = estimate;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public EstimateAdvanceInvoiceEstimateResponse build() {
-      return new EstimateAdvanceInvoiceEstimateResponse(this);
-    }
-  }
-
-  /** Get the estimate from the response. */
-  public Estimate getEstimate() {
-    return estimate;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateSubForCustomerEstimateResponse.java b/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateSubForCustomerEstimateResponse.java
deleted file mode 100644
index 47bdc908..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateSubForCustomerEstimateResponse.java
+++ /dev/null
@@ -1,48 +0,0 @@
-package com.chargebee.v4.core.responses.estimate;
-
-import com.chargebee.v4.core.models.estimate.Estimate;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for EstimateCreateSubForCustomerEstimate operation. Contains the
- * response data from a single resource get operation.
- */
-public final class EstimateCreateSubForCustomerEstimateResponse extends BaseResponse {
-  private final Estimate estimate;
-
-  private EstimateCreateSubForCustomerEstimateResponse(Estimate estimate, Response httpResponse) {
-    super(httpResponse);
-
-    this.estimate = estimate;
-  }
-
-  /** Parse JSON response into EstimateCreateSubForCustomerEstimateResponse object. */
-  public static EstimateCreateSubForCustomerEstimateResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into EstimateCreateSubForCustomerEstimateResponse object with HTTP
-   * response.
-   */
-  public static EstimateCreateSubForCustomerEstimateResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      Estimate estimate = Estimate.fromJson(JsonUtil.getObject(json, "estimate"));
-
-      return new EstimateCreateSubForCustomerEstimateResponse(estimate, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse EstimateCreateSubForCustomerEstimateResponse from JSON", e);
-    }
-  }
-
-  /** Get the estimate from the response. */
-  public Estimate getEstimate() {
-    return estimate;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateSubItemEstimateResponse.java b/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateSubItemEstimateResponse.java
deleted file mode 100644
index 986308f4..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateSubItemEstimateResponse.java
+++ /dev/null
@@ -1,78 +0,0 @@
-package com.chargebee.v4.core.responses.estimate;
-
-import com.chargebee.v4.core.models.estimate.Estimate;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for EstimateCreateSubItemEstimate operation. Contains the response data
- * from the API.
- */
-public final class EstimateCreateSubItemEstimateResponse extends BaseResponse {
-  private final Estimate estimate;
-
-  private EstimateCreateSubItemEstimateResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.estimate = builder.estimate;
-  }
-
-  /** Parse JSON response into EstimateCreateSubItemEstimateResponse object. */
-  public static EstimateCreateSubItemEstimateResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into EstimateCreateSubItemEstimateResponse object with HTTP response. */
-  public static EstimateCreateSubItemEstimateResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __estimateJson = JsonUtil.getObject(json, "estimate");
-      if (__estimateJson != null) {
-        builder.estimate(Estimate.fromJson(__estimateJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse EstimateCreateSubItemEstimateResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for EstimateCreateSubItemEstimateResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for EstimateCreateSubItemEstimateResponse. */
-  public static class Builder {
-
-    private Estimate estimate;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder estimate(Estimate estimate) {
-      this.estimate = estimate;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public EstimateCreateSubItemEstimateResponse build() {
-      return new EstimateCreateSubItemEstimateResponse(this);
-    }
-  }
-
-  /** Get the estimate from the response. */
-  public Estimate getEstimate() {
-    return estimate;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateSubItemForCustomerEstimateResponse.java b/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateSubItemForCustomerEstimateResponse.java
deleted file mode 100644
index afc06da7..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateSubItemForCustomerEstimateResponse.java
+++ /dev/null
@@ -1,82 +0,0 @@
-package com.chargebee.v4.core.responses.estimate;
-
-import com.chargebee.v4.core.models.estimate.Estimate;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for EstimateCreateSubItemForCustomerEstimate operation. Contains the
- * response data from the API.
- */
-public final class EstimateCreateSubItemForCustomerEstimateResponse extends BaseResponse {
-  private final Estimate estimate;
-
-  private EstimateCreateSubItemForCustomerEstimateResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.estimate = builder.estimate;
-  }
-
-  /** Parse JSON response into EstimateCreateSubItemForCustomerEstimateResponse object. */
-  public static EstimateCreateSubItemForCustomerEstimateResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into EstimateCreateSubItemForCustomerEstimateResponse object with HTTP
-   * response.
-   */
-  public static EstimateCreateSubItemForCustomerEstimateResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __estimateJson = JsonUtil.getObject(json, "estimate");
-      if (__estimateJson != null) {
-        builder.estimate(Estimate.fromJson(__estimateJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse EstimateCreateSubItemForCustomerEstimateResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for EstimateCreateSubItemForCustomerEstimateResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for EstimateCreateSubItemForCustomerEstimateResponse. */
-  public static class Builder {
-
-    private Estimate estimate;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder estimate(Estimate estimate) {
-      this.estimate = estimate;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public EstimateCreateSubItemForCustomerEstimateResponse build() {
-      return new EstimateCreateSubItemForCustomerEstimateResponse(this);
-    }
-  }
-
-  /** Get the estimate from the response. */
-  public Estimate getEstimate() {
-    return estimate;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateRegenerateInvoiceEstimateResponse.java b/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateRegenerateInvoiceEstimateResponse.java
deleted file mode 100644
index ee934c2b..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateRegenerateInvoiceEstimateResponse.java
+++ /dev/null
@@ -1,81 +0,0 @@
-package com.chargebee.v4.core.responses.estimate;
-
-import com.chargebee.v4.core.models.estimate.Estimate;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for EstimateRegenerateInvoiceEstimate operation. Contains the response
- * data from the API.
- */
-public final class EstimateRegenerateInvoiceEstimateResponse extends BaseResponse {
-  private final Estimate estimate;
-
-  private EstimateRegenerateInvoiceEstimateResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.estimate = builder.estimate;
-  }
-
-  /** Parse JSON response into EstimateRegenerateInvoiceEstimateResponse object. */
-  public static EstimateRegenerateInvoiceEstimateResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into EstimateRegenerateInvoiceEstimateResponse object with HTTP response.
-   */
-  public static EstimateRegenerateInvoiceEstimateResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __estimateJson = JsonUtil.getObject(json, "estimate");
-      if (__estimateJson != null) {
-        builder.estimate(Estimate.fromJson(__estimateJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse EstimateRegenerateInvoiceEstimateResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for EstimateRegenerateInvoiceEstimateResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for EstimateRegenerateInvoiceEstimateResponse. */
-  public static class Builder {
-
-    private Estimate estimate;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder estimate(Estimate estimate) {
-      this.estimate = estimate;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public EstimateRegenerateInvoiceEstimateResponse build() {
-      return new EstimateRegenerateInvoiceEstimateResponse(this);
-    }
-  }
-
-  /** Get the estimate from the response. */
-  public Estimate getEstimate() {
-    return estimate;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateRenewalEstimateResponse.java b/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateRenewalEstimateResponse.java
deleted file mode 100644
index 22802b60..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateRenewalEstimateResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.estimate;
-
-import com.chargebee.v4.core.models.estimate.Estimate;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for EstimateRenewalEstimate operation. Contains the response data from
- * a single resource get operation.
- */
-public final class EstimateRenewalEstimateResponse extends BaseResponse {
-  private final Estimate estimate;
-
-  private EstimateRenewalEstimateResponse(Estimate estimate, Response httpResponse) {
-    super(httpResponse);
-
-    this.estimate = estimate;
-  }
-
-  /** Parse JSON response into EstimateRenewalEstimateResponse object. */
-  public static EstimateRenewalEstimateResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into EstimateRenewalEstimateResponse object with HTTP response. */
-  public static EstimateRenewalEstimateResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Estimate estimate = Estimate.fromJson(JsonUtil.getObject(json, "estimate"));
-
-      return new EstimateRenewalEstimateResponse(estimate, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse EstimateRenewalEstimateResponse from JSON", e);
-    }
-  }
-
-  /** Get the estimate from the response. */
-  public Estimate getEstimate() {
-    return estimate;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateUpcomingInvoicesEstimateResponse.java b/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateUpcomingInvoicesEstimateResponse.java
deleted file mode 100644
index 9fb7ddd0..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateUpcomingInvoicesEstimateResponse.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.chargebee.v4.core.responses.estimate;
-
-import com.chargebee.v4.core.models.estimate.Estimate;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for EstimateUpcomingInvoicesEstimate operation. Contains the response
- * data from a single resource get operation.
- */
-public final class EstimateUpcomingInvoicesEstimateResponse extends BaseResponse {
-  private final Estimate estimate;
-
-  private EstimateUpcomingInvoicesEstimateResponse(Estimate estimate, Response httpResponse) {
-    super(httpResponse);
-
-    this.estimate = estimate;
-  }
-
-  /** Parse JSON response into EstimateUpcomingInvoicesEstimateResponse object. */
-  public static EstimateUpcomingInvoicesEstimateResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into EstimateUpcomingInvoicesEstimateResponse object with HTTP response.
-   */
-  public static EstimateUpcomingInvoicesEstimateResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      Estimate estimate = Estimate.fromJson(JsonUtil.getObject(json, "estimate"));
-
-      return new EstimateUpcomingInvoicesEstimateResponse(estimate, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse EstimateUpcomingInvoicesEstimateResponse from JSON", e);
-    }
-  }
-
-  /** Get the estimate from the response. */
-  public Estimate getEstimate() {
-    return estimate;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/event/EventRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/event/EventRetrieveResponse.java
deleted file mode 100644
index c8f868ef..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/event/EventRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.event;
-
-import com.chargebee.v4.core.models.event.Event;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for EventRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class EventRetrieveResponse extends BaseResponse {
-  private final Event event;
-
-  private EventRetrieveResponse(Event event, Response httpResponse) {
-    super(httpResponse);
-
-    this.event = event;
-  }
-
-  /** Parse JSON response into EventRetrieveResponse object. */
-  public static EventRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into EventRetrieveResponse object with HTTP response. */
-  public static EventRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Event event = Event.fromJson(JsonUtil.getObject(json, "event"));
-
-      return new EventRetrieveResponse(event, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse EventRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the event from the response. */
-  public Event getEvent() {
-    return event;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/export/ExportRetrieveResponse.java
deleted file mode 100644
index 3cf4015f..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.export;
-
-import com.chargebee.v4.core.models.export.Export;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ExportRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class ExportRetrieveResponse extends BaseResponse {
-  private final Export export;
-
-  private ExportRetrieveResponse(Export export, Response httpResponse) {
-    super(httpResponse);
-
-    this.export = export;
-  }
-
-  /** Parse JSON response into ExportRetrieveResponse object. */
-  public static ExportRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into ExportRetrieveResponse object with HTTP response. */
-  public static ExportRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Export export = Export.fromJson(JsonUtil.getObject(json, "export"));
-
-      return new ExportRetrieveResponse(export, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse ExportRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the export from the response. */
-  public Export getExport() {
-    return export;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/feature/FeatureRetrieveResponse.java
deleted file mode 100644
index 95de3af7..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.feature;
-
-import com.chargebee.v4.core.models.feature.Feature;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for FeatureRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class FeatureRetrieveResponse extends BaseResponse {
-  private final Feature feature;
-
-  private FeatureRetrieveResponse(Feature feature, Response httpResponse) {
-    super(httpResponse);
-
-    this.feature = feature;
-  }
-
-  /** Parse JSON response into FeatureRetrieveResponse object. */
-  public static FeatureRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into FeatureRetrieveResponse object with HTTP response. */
-  public static FeatureRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Feature feature = Feature.fromJson(JsonUtil.getObject(json, "feature"));
-
-      return new FeatureRetrieveResponse(feature, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse FeatureRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the feature from the response. */
-  public Feature getFeature() {
-    return feature;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/fullExport/FullExportStatusResponse.java b/src/main/java/com/chargebee/v4/core/responses/fullExport/FullExportStatusResponse.java
deleted file mode 100644
index be84c0ab..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/fullExport/FullExportStatusResponse.java
+++ /dev/null
@@ -1,41 +0,0 @@
-package com.chargebee.v4.core.responses.fullExport;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for FullExportStatus operation. Contains the response data from a
- * single resource get operation.
- */
-public final class FullExportStatusResponse extends BaseResponse {
-  private final Object fullExport;
-
-  private FullExportStatusResponse(Object fullExport, Response httpResponse) {
-    super(httpResponse);
-
-    this.fullExport = fullExport;
-  }
-
-  /** Parse JSON response into FullExportStatusResponse object. */
-  public static FullExportStatusResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into FullExportStatusResponse object with HTTP response. */
-  public static FullExportStatusResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Object fullExport = JsonUtil.getObject(json, "full_export");
-
-      return new FullExportStatusResponse(fullExport, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse FullExportStatusResponse from JSON", e);
-    }
-  }
-
-  /** Get the fullExport from the response. */
-  public Object getFullExport() {
-    return fullExport;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/gift/GiftRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/gift/GiftRetrieveResponse.java
deleted file mode 100644
index b427ec75..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/gift/GiftRetrieveResponse.java
+++ /dev/null
@@ -1,56 +0,0 @@
-package com.chargebee.v4.core.responses.gift;
-
-import com.chargebee.v4.core.models.gift.Gift;
-
-import com.chargebee.v4.core.models.subscription.Subscription;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for GiftRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class GiftRetrieveResponse extends BaseResponse {
-  private final Gift gift;
-
-  private final Subscription subscription;
-
-  private GiftRetrieveResponse(Gift gift, Subscription subscription, Response httpResponse) {
-    super(httpResponse);
-
-    this.gift = gift;
-
-    this.subscription = subscription;
-  }
-
-  /** Parse JSON response into GiftRetrieveResponse object. */
-  public static GiftRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into GiftRetrieveResponse object with HTTP response. */
-  public static GiftRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Gift gift = Gift.fromJson(JsonUtil.getObject(json, "gift"));
-
-      Subscription subscription = Subscription.fromJson(JsonUtil.getObject(json, "subscription"));
-
-      return new GiftRetrieveResponse(gift, subscription, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse GiftRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the gift from the response. */
-  public Gift getGift() {
-    return gift;
-  }
-
-  /** Get the subscription from the response. */
-  public Subscription getSubscription() {
-    return subscription;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/gift/GiftUpdateGiftResponse.java b/src/main/java/com/chargebee/v4/core/responses/gift/GiftUpdateGiftResponse.java
deleted file mode 100644
index 7f25499e..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/gift/GiftUpdateGiftResponse.java
+++ /dev/null
@@ -1,99 +0,0 @@
-package com.chargebee.v4.core.responses.gift;
-
-import com.chargebee.v4.core.models.gift.Gift;
-
-import com.chargebee.v4.core.models.subscription.Subscription;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for GiftUpdateGift operation. Contains the response data from the API.
- */
-public final class GiftUpdateGiftResponse extends BaseResponse {
-  private final Gift gift;
-
-  private final Subscription subscription;
-
-  private GiftUpdateGiftResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.gift = builder.gift;
-
-    this.subscription = builder.subscription;
-  }
-
-  /** Parse JSON response into GiftUpdateGiftResponse object. */
-  public static GiftUpdateGiftResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into GiftUpdateGiftResponse object with HTTP response. */
-  public static GiftUpdateGiftResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __giftJson = JsonUtil.getObject(json, "gift");
-      if (__giftJson != null) {
-        builder.gift(Gift.fromJson(__giftJson));
-      }
-
-      String __subscriptionJson = JsonUtil.getObject(json, "subscription");
-      if (__subscriptionJson != null) {
-        builder.subscription(Subscription.fromJson(__subscriptionJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse GiftUpdateGiftResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for GiftUpdateGiftResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for GiftUpdateGiftResponse. */
-  public static class Builder {
-
-    private Gift gift;
-
-    private Subscription subscription;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder gift(Gift gift) {
-      this.gift = gift;
-      return this;
-    }
-
-    public Builder subscription(Subscription subscription) {
-      this.subscription = subscription;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public GiftUpdateGiftResponse build() {
-      return new GiftUpdateGiftResponse(this);
-    }
-  }
-
-  /** Get the gift from the response. */
-  public Gift getGift() {
-    return gift;
-  }
-
-  /** Get the subscription from the response. */
-  public Subscription getSubscription() {
-    return subscription;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageRetrieveResponse.java
deleted file mode 100644
index ca4ef1da..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.hostedPage;
-
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for HostedPageRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class HostedPageRetrieveResponse extends BaseResponse {
-  private final HostedPage hostedPage;
-
-  private HostedPageRetrieveResponse(HostedPage hostedPage, Response httpResponse) {
-    super(httpResponse);
-
-    this.hostedPage = hostedPage;
-  }
-
-  /** Parse JSON response into HostedPageRetrieveResponse object. */
-  public static HostedPageRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into HostedPageRetrieveResponse object with HTTP response. */
-  public static HostedPageRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      HostedPage hostedPage = HostedPage.fromJson(JsonUtil.getObject(json, "hosted_page"));
-
-      return new HostedPageRetrieveResponse(hostedPage, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse HostedPageRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the hostedPage from the response. */
-  public HostedPage getHostedPage() {
-    return hostedPage;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/inAppSubscription/InAppSubscriptionRetrieveStoreSubsResponse.java b/src/main/java/com/chargebee/v4/core/responses/inAppSubscription/InAppSubscriptionRetrieveStoreSubsResponse.java
deleted file mode 100644
index de196eb3..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/inAppSubscription/InAppSubscriptionRetrieveStoreSubsResponse.java
+++ /dev/null
@@ -1,83 +0,0 @@
-package com.chargebee.v4.core.responses.inAppSubscription;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.inAppSubscription.InAppSubscription;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for InAppSubscriptionRetrieveStoreSubs operation. Contains the response
- * data from the API.
- */
-public final class InAppSubscriptionRetrieveStoreSubsResponse extends BaseResponse {
-  private final List<InAppSubscription> inAppSubscriptions;
-
-  private InAppSubscriptionRetrieveStoreSubsResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.inAppSubscriptions = builder.inAppSubscriptions;
-  }
-
-  /** Parse JSON response into InAppSubscriptionRetrieveStoreSubsResponse object. */
-  public static InAppSubscriptionRetrieveStoreSubsResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into InAppSubscriptionRetrieveStoreSubsResponse object with HTTP response.
-   */
-  public static InAppSubscriptionRetrieveStoreSubsResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      builder.inAppSubscriptions(
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "in_app_subscriptions")).stream()
-              .map(InAppSubscription::fromJson)
-              .collect(java.util.stream.Collectors.toList()));
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse InAppSubscriptionRetrieveStoreSubsResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for InAppSubscriptionRetrieveStoreSubsResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for InAppSubscriptionRetrieveStoreSubsResponse. */
-  public static class Builder {
-
-    private List<InAppSubscription> inAppSubscriptions;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder inAppSubscriptions(List<InAppSubscription> inAppSubscriptions) {
-      this.inAppSubscriptions = inAppSubscriptions;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public InAppSubscriptionRetrieveStoreSubsResponse build() {
-      return new InAppSubscriptionRetrieveStoreSubsResponse(this);
-    }
-  }
-
-  /** Get the inAppSubscriptions from the response. */
-  public List<InAppSubscription> getInAppSubscriptions() {
-    return inAppSubscriptions;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceDownloadEinvoiceResponse.java b/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceDownloadEinvoiceResponse.java
deleted file mode 100644
index 7ad9786d..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceDownloadEinvoiceResponse.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.chargebee.v4.core.responses.invoice;
-
-import com.chargebee.v4.core.models.download.Download;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import java.util.List;
-
-/**
- * Immutable response object for InvoiceDownloadEinvoice operation. Contains the response data from
- * a single resource get operation.
- */
-public final class InvoiceDownloadEinvoiceResponse extends BaseResponse {
-  private final List<Download> downloads;
-
-  private InvoiceDownloadEinvoiceResponse(List<Download> downloads, Response httpResponse) {
-    super(httpResponse);
-
-    this.downloads = downloads;
-  }
-
-  /** Parse JSON response into InvoiceDownloadEinvoiceResponse object. */
-  public static InvoiceDownloadEinvoiceResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into InvoiceDownloadEinvoiceResponse object with HTTP response. */
-  public static InvoiceDownloadEinvoiceResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      List<Download> downloads =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "downloads")).stream()
-              .map(Download::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      return new InvoiceDownloadEinvoiceResponse(downloads, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse InvoiceDownloadEinvoiceResponse from JSON", e);
-    }
-  }
-
-  /** Get the downloads from the response. */
-  public List<Download> getDownloads() {
-    return downloads;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceImportInvoiceResponse.java b/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceImportInvoiceResponse.java
deleted file mode 100644
index 46247173..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceImportInvoiceResponse.java
+++ /dev/null
@@ -1,100 +0,0 @@
-package com.chargebee.v4.core.responses.invoice;
-
-import com.chargebee.v4.core.models.invoice.Invoice;
-
-import com.chargebee.v4.core.models.creditNote.CreditNote;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for InvoiceImportInvoice operation. Contains the response data from the
- * API.
- */
-public final class InvoiceImportInvoiceResponse extends BaseResponse {
-  private final Invoice invoice;
-
-  private final CreditNote creditNote;
-
-  private InvoiceImportInvoiceResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.invoice = builder.invoice;
-
-    this.creditNote = builder.creditNote;
-  }
-
-  /** Parse JSON response into InvoiceImportInvoiceResponse object. */
-  public static InvoiceImportInvoiceResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into InvoiceImportInvoiceResponse object with HTTP response. */
-  public static InvoiceImportInvoiceResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __invoiceJson = JsonUtil.getObject(json, "invoice");
-      if (__invoiceJson != null) {
-        builder.invoice(Invoice.fromJson(__invoiceJson));
-      }
-
-      String __creditNoteJson = JsonUtil.getObject(json, "credit_note");
-      if (__creditNoteJson != null) {
-        builder.creditNote(CreditNote.fromJson(__creditNoteJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse InvoiceImportInvoiceResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for InvoiceImportInvoiceResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for InvoiceImportInvoiceResponse. */
-  public static class Builder {
-
-    private Invoice invoice;
-
-    private CreditNote creditNote;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder invoice(Invoice invoice) {
-      this.invoice = invoice;
-      return this;
-    }
-
-    public Builder creditNote(CreditNote creditNote) {
-      this.creditNote = creditNote;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public InvoiceImportInvoiceResponse build() {
-      return new InvoiceImportInvoiceResponse(this);
-    }
-  }
-
-  /** Get the invoice from the response. */
-  public Invoice getInvoice() {
-    return invoice;
-  }
-
-  /** Get the creditNote from the response. */
-  public CreditNote getCreditNote() {
-    return creditNote;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceInvoicesForCustomerResponse.java b/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceInvoicesForCustomerResponse.java
deleted file mode 100644
index 456ac389..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceInvoicesForCustomerResponse.java
+++ /dev/null
@@ -1,175 +0,0 @@
-package com.chargebee.v4.core.responses.invoice;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.invoice.Invoice;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.InvoiceService;
-import com.chargebee.v4.core.models.invoice.params.InvoiceInvoicesForCustomerParams;
-
-/**
- * Immutable response object for InvoiceInvoicesForCustomer operation. Contains paginated list data.
- */
-public final class InvoiceInvoicesForCustomerResponse {
-
-  private final List<InvoiceInvoicesForCustomerItem> list;
-
-  private final String nextOffset;
-
-  private final String customerId;
-
-  private final InvoiceService service;
-  private final InvoiceInvoicesForCustomerParams originalParams;
-  private final Response httpResponse;
-
-  private InvoiceInvoicesForCustomerResponse(
-      List<InvoiceInvoicesForCustomerItem> list,
-      String nextOffset,
-      String customerId,
-      InvoiceService service,
-      InvoiceInvoicesForCustomerParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.customerId = customerId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into InvoiceInvoicesForCustomerResponse object (no service context). Use
-   * this when you only need to read a single page (no nextPage()).
-   */
-  public static InvoiceInvoicesForCustomerResponse fromJson(String json) {
-    try {
-
-      List<InvoiceInvoicesForCustomerItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(InvoiceInvoicesForCustomerItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new InvoiceInvoicesForCustomerResponse(list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse InvoiceInvoicesForCustomerResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into InvoiceInvoicesForCustomerResponse object with service context for
-   * pagination (enables nextPage()).
-   */
-  public static InvoiceInvoicesForCustomerResponse fromJson(
-      String json,
-      InvoiceService service,
-      InvoiceInvoicesForCustomerParams originalParams,
-      String customerId,
-      Response httpResponse) {
-    try {
-
-      List<InvoiceInvoicesForCustomerItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(InvoiceInvoicesForCustomerItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new InvoiceInvoicesForCustomerResponse(
-          list, nextOffset, customerId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse InvoiceInvoicesForCustomerResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<InvoiceInvoicesForCustomerItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public InvoiceInvoicesForCustomerResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    InvoiceInvoicesForCustomerParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : InvoiceInvoicesForCustomerParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.invoicesForCustomer(customerId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class InvoiceInvoicesForCustomerItem {
-
-    private Invoice invoice;
-
-    public Invoice getInvoice() {
-      return invoice;
-    }
-
-    public static InvoiceInvoicesForCustomerItem fromJson(String json) {
-      InvoiceInvoicesForCustomerItem item = new InvoiceInvoicesForCustomerItem();
-
-      String __invoiceJson = JsonUtil.getObject(json, "invoice");
-      if (__invoiceJson != null) {
-        item.invoice = Invoice.fromJson(__invoiceJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceInvoicesForSubscriptionResponse.java b/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceInvoicesForSubscriptionResponse.java
deleted file mode 100644
index 1409df1e..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceInvoicesForSubscriptionResponse.java
+++ /dev/null
@@ -1,178 +0,0 @@
-package com.chargebee.v4.core.responses.invoice;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.invoice.Invoice;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.InvoiceService;
-import com.chargebee.v4.core.models.invoice.params.InvoiceInvoicesForSubscriptionParams;
-
-/**
- * Immutable response object for InvoiceInvoicesForSubscription operation. Contains paginated list
- * data.
- */
-public final class InvoiceInvoicesForSubscriptionResponse {
-
-  private final List<InvoiceInvoicesForSubscriptionItem> list;
-
-  private final String nextOffset;
-
-  private final String subscriptionId;
-
-  private final InvoiceService service;
-  private final InvoiceInvoicesForSubscriptionParams originalParams;
-  private final Response httpResponse;
-
-  private InvoiceInvoicesForSubscriptionResponse(
-      List<InvoiceInvoicesForSubscriptionItem> list,
-      String nextOffset,
-      String subscriptionId,
-      InvoiceService service,
-      InvoiceInvoicesForSubscriptionParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.subscriptionId = subscriptionId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into InvoiceInvoicesForSubscriptionResponse object (no service context).
-   * Use this when you only need to read a single page (no nextPage()).
-   */
-  public static InvoiceInvoicesForSubscriptionResponse fromJson(String json) {
-    try {
-
-      List<InvoiceInvoicesForSubscriptionItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(InvoiceInvoicesForSubscriptionItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new InvoiceInvoicesForSubscriptionResponse(list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse InvoiceInvoicesForSubscriptionResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into InvoiceInvoicesForSubscriptionResponse object with service context for
-   * pagination (enables nextPage()).
-   */
-  public static InvoiceInvoicesForSubscriptionResponse fromJson(
-      String json,
-      InvoiceService service,
-      InvoiceInvoicesForSubscriptionParams originalParams,
-      String subscriptionId,
-      Response httpResponse) {
-    try {
-
-      List<InvoiceInvoicesForSubscriptionItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(InvoiceInvoicesForSubscriptionItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new InvoiceInvoicesForSubscriptionResponse(
-          list, nextOffset, subscriptionId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse InvoiceInvoicesForSubscriptionResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<InvoiceInvoicesForSubscriptionItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public InvoiceInvoicesForSubscriptionResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    InvoiceInvoicesForSubscriptionParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : InvoiceInvoicesForSubscriptionParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.invoicesForSubscription(subscriptionId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class InvoiceInvoicesForSubscriptionItem {
-
-    private Invoice invoice;
-
-    public Invoice getInvoice() {
-      return invoice;
-    }
-
-    public static InvoiceInvoicesForSubscriptionItem fromJson(String json) {
-      InvoiceInvoicesForSubscriptionItem item = new InvoiceInvoicesForSubscriptionItem();
-
-      String __invoiceJson = JsonUtil.getObject(json, "invoice");
-      if (__invoiceJson != null) {
-        item.invoice = Invoice.fromJson(__invoiceJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoicePaymentSchedulesResponse.java b/src/main/java/com/chargebee/v4/core/responses/invoice/InvoicePaymentSchedulesResponse.java
deleted file mode 100644
index 1569e2f3..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoicePaymentSchedulesResponse.java
+++ /dev/null
@@ -1,48 +0,0 @@
-package com.chargebee.v4.core.responses.invoice;
-
-import com.chargebee.v4.core.models.paymentSchedule.PaymentSchedule;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import java.util.List;
-
-/**
- * Immutable response object for InvoicePaymentSchedules operation. Contains the response data from
- * a single resource get operation.
- */
-public final class InvoicePaymentSchedulesResponse extends BaseResponse {
-  private final List<PaymentSchedule> paymentSchedules;
-
-  private InvoicePaymentSchedulesResponse(
-      List<PaymentSchedule> paymentSchedules, Response httpResponse) {
-    super(httpResponse);
-
-    this.paymentSchedules = paymentSchedules;
-  }
-
-  /** Parse JSON response into InvoicePaymentSchedulesResponse object. */
-  public static InvoicePaymentSchedulesResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into InvoicePaymentSchedulesResponse object with HTTP response. */
-  public static InvoicePaymentSchedulesResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      List<PaymentSchedule> paymentSchedules =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "payment_schedules")).stream()
-              .map(PaymentSchedule::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      return new InvoicePaymentSchedulesResponse(paymentSchedules, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse InvoicePaymentSchedulesResponse from JSON", e);
-    }
-  }
-
-  /** Get the paymentSchedules from the response. */
-  public List<PaymentSchedule> getPaymentSchedules() {
-    return paymentSchedules;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceResendEinvoiceResponse.java b/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceResendEinvoiceResponse.java
deleted file mode 100644
index 598865ab..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceResendEinvoiceResponse.java
+++ /dev/null
@@ -1,77 +0,0 @@
-package com.chargebee.v4.core.responses.invoice;
-
-import com.chargebee.v4.core.models.invoice.Invoice;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for InvoiceResendEinvoice operation. Contains the response data from
- * the API.
- */
-public final class InvoiceResendEinvoiceResponse extends BaseResponse {
-  private final Invoice invoice;
-
-  private InvoiceResendEinvoiceResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.invoice = builder.invoice;
-  }
-
-  /** Parse JSON response into InvoiceResendEinvoiceResponse object. */
-  public static InvoiceResendEinvoiceResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into InvoiceResendEinvoiceResponse object with HTTP response. */
-  public static InvoiceResendEinvoiceResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __invoiceJson = JsonUtil.getObject(json, "invoice");
-      if (__invoiceJson != null) {
-        builder.invoice(Invoice.fromJson(__invoiceJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse InvoiceResendEinvoiceResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for InvoiceResendEinvoiceResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for InvoiceResendEinvoiceResponse. */
-  public static class Builder {
-
-    private Invoice invoice;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder invoice(Invoice invoice) {
-      this.invoice = invoice;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public InvoiceResendEinvoiceResponse build() {
-      return new InvoiceResendEinvoiceResponse(this);
-    }
-  }
-
-  /** Get the invoice from the response. */
-  public Invoice getInvoice() {
-    return invoice;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRetrieveResponse.java
deleted file mode 100644
index 5423d3e8..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.invoice;
-
-import com.chargebee.v4.core.models.invoice.Invoice;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for InvoiceRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class InvoiceRetrieveResponse extends BaseResponse {
-  private final Invoice invoice;
-
-  private InvoiceRetrieveResponse(Invoice invoice, Response httpResponse) {
-    super(httpResponse);
-
-    this.invoice = invoice;
-  }
-
-  /** Parse JSON response into InvoiceRetrieveResponse object. */
-  public static InvoiceRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into InvoiceRetrieveResponse object with HTTP response. */
-  public static InvoiceRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Invoice invoice = Invoice.fromJson(JsonUtil.getObject(json, "invoice"));
-
-      return new InvoiceRetrieveResponse(invoice, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse InvoiceRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the invoice from the response. */
-  public Invoice getInvoice() {
-    return invoice;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceSendEinvoiceResponse.java b/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceSendEinvoiceResponse.java
deleted file mode 100644
index 94ede9e3..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceSendEinvoiceResponse.java
+++ /dev/null
@@ -1,77 +0,0 @@
-package com.chargebee.v4.core.responses.invoice;
-
-import com.chargebee.v4.core.models.invoice.Invoice;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for InvoiceSendEinvoice operation. Contains the response data from the
- * API.
- */
-public final class InvoiceSendEinvoiceResponse extends BaseResponse {
-  private final Invoice invoice;
-
-  private InvoiceSendEinvoiceResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.invoice = builder.invoice;
-  }
-
-  /** Parse JSON response into InvoiceSendEinvoiceResponse object. */
-  public static InvoiceSendEinvoiceResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into InvoiceSendEinvoiceResponse object with HTTP response. */
-  public static InvoiceSendEinvoiceResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __invoiceJson = JsonUtil.getObject(json, "invoice");
-      if (__invoiceJson != null) {
-        builder.invoice(Invoice.fromJson(__invoiceJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse InvoiceSendEinvoiceResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for InvoiceSendEinvoiceResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for InvoiceSendEinvoiceResponse. */
-  public static class Builder {
-
-    private Invoice invoice;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder invoice(Invoice invoice) {
-      this.invoice = invoice;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public InvoiceSendEinvoiceResponse build() {
-      return new InvoiceSendEinvoiceResponse(this);
-    }
-  }
-
-  /** Get the invoice from the response. */
-  public Invoice getInvoice() {
-    return invoice;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceVoidInvoiceResponse.java b/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceVoidInvoiceResponse.java
deleted file mode 100644
index 6ebd1dd4..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceVoidInvoiceResponse.java
+++ /dev/null
@@ -1,100 +0,0 @@
-package com.chargebee.v4.core.responses.invoice;
-
-import com.chargebee.v4.core.models.invoice.Invoice;
-
-import com.chargebee.v4.core.models.creditNote.CreditNote;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for InvoiceVoidInvoice operation. Contains the response data from the
- * API.
- */
-public final class InvoiceVoidInvoiceResponse extends BaseResponse {
-  private final Invoice invoice;
-
-  private final CreditNote creditNote;
-
-  private InvoiceVoidInvoiceResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.invoice = builder.invoice;
-
-    this.creditNote = builder.creditNote;
-  }
-
-  /** Parse JSON response into InvoiceVoidInvoiceResponse object. */
-  public static InvoiceVoidInvoiceResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into InvoiceVoidInvoiceResponse object with HTTP response. */
-  public static InvoiceVoidInvoiceResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __invoiceJson = JsonUtil.getObject(json, "invoice");
-      if (__invoiceJson != null) {
-        builder.invoice(Invoice.fromJson(__invoiceJson));
-      }
-
-      String __creditNoteJson = JsonUtil.getObject(json, "credit_note");
-      if (__creditNoteJson != null) {
-        builder.creditNote(CreditNote.fromJson(__creditNoteJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse InvoiceVoidInvoiceResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for InvoiceVoidInvoiceResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for InvoiceVoidInvoiceResponse. */
-  public static class Builder {
-
-    private Invoice invoice;
-
-    private CreditNote creditNote;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder invoice(Invoice invoice) {
-      this.invoice = invoice;
-      return this;
-    }
-
-    public Builder creditNote(CreditNote creditNote) {
-      this.creditNote = creditNote;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public InvoiceVoidInvoiceResponse build() {
-      return new InvoiceVoidInvoiceResponse(this);
-    }
-  }
-
-  /** Get the invoice from the response. */
-  public Invoice getInvoice() {
-    return invoice;
-  }
-
-  /** Get the creditNote from the response. */
-  public CreditNote getCreditNote() {
-    return creditNote;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/item/ItemRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/item/ItemRetrieveResponse.java
deleted file mode 100644
index 624e9406..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/item/ItemRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.item;
-
-import com.chargebee.v4.core.models.item.Item;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ItemRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class ItemRetrieveResponse extends BaseResponse {
-  private final Item item;
-
-  private ItemRetrieveResponse(Item item, Response httpResponse) {
-    super(httpResponse);
-
-    this.item = item;
-  }
-
-  /** Parse JSON response into ItemRetrieveResponse object. */
-  public static ItemRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into ItemRetrieveResponse object with HTTP response. */
-  public static ItemRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Item item = Item.fromJson(JsonUtil.getObject(json, "item"));
-
-      return new ItemRetrieveResponse(item, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse ItemRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the item from the response. */
-  public Item getItem() {
-    return item;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemEntitlement/ItemEntitlementAddItemEntitlementsResponse.java b/src/main/java/com/chargebee/v4/core/responses/itemEntitlement/ItemEntitlementAddItemEntitlementsResponse.java
deleted file mode 100644
index d58fa35e..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/itemEntitlement/ItemEntitlementAddItemEntitlementsResponse.java
+++ /dev/null
@@ -1,81 +0,0 @@
-package com.chargebee.v4.core.responses.itemEntitlement;
-
-import com.chargebee.v4.core.models.itemEntitlement.ItemEntitlement;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ItemEntitlementAddItemEntitlements operation. Contains the response
- * data from the API.
- */
-public final class ItemEntitlementAddItemEntitlementsResponse extends BaseResponse {
-  private final ItemEntitlement itemEntitlement;
-
-  private ItemEntitlementAddItemEntitlementsResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.itemEntitlement = builder.itemEntitlement;
-  }
-
-  /** Parse JSON response into ItemEntitlementAddItemEntitlementsResponse object. */
-  public static ItemEntitlementAddItemEntitlementsResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into ItemEntitlementAddItemEntitlementsResponse object with HTTP response.
-   */
-  public static ItemEntitlementAddItemEntitlementsResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __itemEntitlementJson = JsonUtil.getObject(json, "item_entitlement");
-      if (__itemEntitlementJson != null) {
-        builder.itemEntitlement(ItemEntitlement.fromJson(__itemEntitlementJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ItemEntitlementAddItemEntitlementsResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for ItemEntitlementAddItemEntitlementsResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for ItemEntitlementAddItemEntitlementsResponse. */
-  public static class Builder {
-
-    private ItemEntitlement itemEntitlement;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder itemEntitlement(ItemEntitlement itemEntitlement) {
-      this.itemEntitlement = itemEntitlement;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public ItemEntitlementAddItemEntitlementsResponse build() {
-      return new ItemEntitlementAddItemEntitlementsResponse(this);
-    }
-  }
-
-  /** Get the itemEntitlement from the response. */
-  public ItemEntitlement getItemEntitlement() {
-    return itemEntitlement;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemEntitlement/ItemEntitlementItemEntitlementsForFeatureResponse.java b/src/main/java/com/chargebee/v4/core/responses/itemEntitlement/ItemEntitlementItemEntitlementsForFeatureResponse.java
deleted file mode 100644
index f0c8c3bd..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/itemEntitlement/ItemEntitlementItemEntitlementsForFeatureResponse.java
+++ /dev/null
@@ -1,180 +0,0 @@
-package com.chargebee.v4.core.responses.itemEntitlement;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.itemEntitlement.ItemEntitlement;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.ItemEntitlementService;
-import com.chargebee.v4.core.models.itemEntitlement.params.ItemEntitlementItemEntitlementsForFeatureParams;
-
-/**
- * Immutable response object for ItemEntitlementItemEntitlementsForFeature operation. Contains
- * paginated list data.
- */
-public final class ItemEntitlementItemEntitlementsForFeatureResponse {
-
-  private final List<ItemEntitlementItemEntitlementsForFeatureItem> list;
-
-  private final String nextOffset;
-
-  private final String featureId;
-
-  private final ItemEntitlementService service;
-  private final ItemEntitlementItemEntitlementsForFeatureParams originalParams;
-  private final Response httpResponse;
-
-  private ItemEntitlementItemEntitlementsForFeatureResponse(
-      List<ItemEntitlementItemEntitlementsForFeatureItem> list,
-      String nextOffset,
-      String featureId,
-      ItemEntitlementService service,
-      ItemEntitlementItemEntitlementsForFeatureParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.featureId = featureId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into ItemEntitlementItemEntitlementsForFeatureResponse object (no service
-   * context). Use this when you only need to read a single page (no nextPage()).
-   */
-  public static ItemEntitlementItemEntitlementsForFeatureResponse fromJson(String json) {
-    try {
-
-      List<ItemEntitlementItemEntitlementsForFeatureItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(ItemEntitlementItemEntitlementsForFeatureItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new ItemEntitlementItemEntitlementsForFeatureResponse(
-          list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ItemEntitlementItemEntitlementsForFeatureResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into ItemEntitlementItemEntitlementsForFeatureResponse object with service
-   * context for pagination (enables nextPage()).
-   */
-  public static ItemEntitlementItemEntitlementsForFeatureResponse fromJson(
-      String json,
-      ItemEntitlementService service,
-      ItemEntitlementItemEntitlementsForFeatureParams originalParams,
-      String featureId,
-      Response httpResponse) {
-    try {
-
-      List<ItemEntitlementItemEntitlementsForFeatureItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(ItemEntitlementItemEntitlementsForFeatureItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new ItemEntitlementItemEntitlementsForFeatureResponse(
-          list, nextOffset, featureId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ItemEntitlementItemEntitlementsForFeatureResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<ItemEntitlementItemEntitlementsForFeatureItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public ItemEntitlementItemEntitlementsForFeatureResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    ItemEntitlementItemEntitlementsForFeatureParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : ItemEntitlementItemEntitlementsForFeatureParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.itemEntitlementsForFeature(featureId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class ItemEntitlementItemEntitlementsForFeatureItem {
-
-    private ItemEntitlement itemEntitlement;
-
-    public ItemEntitlement getItemEntitlement() {
-      return itemEntitlement;
-    }
-
-    public static ItemEntitlementItemEntitlementsForFeatureItem fromJson(String json) {
-      ItemEntitlementItemEntitlementsForFeatureItem item =
-          new ItemEntitlementItemEntitlementsForFeatureItem();
-
-      String __itemEntitlementJson = JsonUtil.getObject(json, "item_entitlement");
-      if (__itemEntitlementJson != null) {
-        item.itemEntitlement = ItemEntitlement.fromJson(__itemEntitlementJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemEntitlement/ItemEntitlementItemEntitlementsForItemResponse.java b/src/main/java/com/chargebee/v4/core/responses/itemEntitlement/ItemEntitlementItemEntitlementsForItemResponse.java
deleted file mode 100644
index 2fa743ae..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/itemEntitlement/ItemEntitlementItemEntitlementsForItemResponse.java
+++ /dev/null
@@ -1,180 +0,0 @@
-package com.chargebee.v4.core.responses.itemEntitlement;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.itemEntitlement.ItemEntitlement;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.ItemEntitlementService;
-import com.chargebee.v4.core.models.itemEntitlement.params.ItemEntitlementItemEntitlementsForItemParams;
-
-/**
- * Immutable response object for ItemEntitlementItemEntitlementsForItem operation. Contains
- * paginated list data.
- */
-public final class ItemEntitlementItemEntitlementsForItemResponse {
-
-  private final List<ItemEntitlementItemEntitlementsForItemItem> list;
-
-  private final String nextOffset;
-
-  private final String itemId;
-
-  private final ItemEntitlementService service;
-  private final ItemEntitlementItemEntitlementsForItemParams originalParams;
-  private final Response httpResponse;
-
-  private ItemEntitlementItemEntitlementsForItemResponse(
-      List<ItemEntitlementItemEntitlementsForItemItem> list,
-      String nextOffset,
-      String itemId,
-      ItemEntitlementService service,
-      ItemEntitlementItemEntitlementsForItemParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.itemId = itemId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into ItemEntitlementItemEntitlementsForItemResponse object (no service
-   * context). Use this when you only need to read a single page (no nextPage()).
-   */
-  public static ItemEntitlementItemEntitlementsForItemResponse fromJson(String json) {
-    try {
-
-      List<ItemEntitlementItemEntitlementsForItemItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(ItemEntitlementItemEntitlementsForItemItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new ItemEntitlementItemEntitlementsForItemResponse(
-          list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ItemEntitlementItemEntitlementsForItemResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into ItemEntitlementItemEntitlementsForItemResponse object with service
-   * context for pagination (enables nextPage()).
-   */
-  public static ItemEntitlementItemEntitlementsForItemResponse fromJson(
-      String json,
-      ItemEntitlementService service,
-      ItemEntitlementItemEntitlementsForItemParams originalParams,
-      String itemId,
-      Response httpResponse) {
-    try {
-
-      List<ItemEntitlementItemEntitlementsForItemItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(ItemEntitlementItemEntitlementsForItemItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new ItemEntitlementItemEntitlementsForItemResponse(
-          list, nextOffset, itemId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ItemEntitlementItemEntitlementsForItemResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<ItemEntitlementItemEntitlementsForItemItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public ItemEntitlementItemEntitlementsForItemResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    ItemEntitlementItemEntitlementsForItemParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : ItemEntitlementItemEntitlementsForItemParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.itemEntitlementsForItem(itemId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class ItemEntitlementItemEntitlementsForItemItem {
-
-    private ItemEntitlement itemEntitlement;
-
-    public ItemEntitlement getItemEntitlement() {
-      return itemEntitlement;
-    }
-
-    public static ItemEntitlementItemEntitlementsForItemItem fromJson(String json) {
-      ItemEntitlementItemEntitlementsForItemItem item =
-          new ItemEntitlementItemEntitlementsForItemItem();
-
-      String __itemEntitlementJson = JsonUtil.getObject(json, "item_entitlement");
-      if (__itemEntitlementJson != null) {
-        item.itemEntitlement = ItemEntitlement.fromJson(__itemEntitlementJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemEntitlement/ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse.java b/src/main/java/com/chargebee/v4/core/responses/itemEntitlement/ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse.java
deleted file mode 100644
index cf4e7a80..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/itemEntitlement/ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse.java
+++ /dev/null
@@ -1,86 +0,0 @@
-package com.chargebee.v4.core.responses.itemEntitlement;
-
-import com.chargebee.v4.core.models.itemEntitlement.ItemEntitlement;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ItemEntitlementUpsertOrRemoveItemEntitlementsForItem operation.
- * Contains the response data from the API.
- */
-public final class ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse
-    extends BaseResponse {
-  private final ItemEntitlement itemEntitlement;
-
-  private ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.itemEntitlement = builder.itemEntitlement;
-  }
-
-  /**
-   * Parse JSON response into ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse object.
-   */
-  public static ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse object
-   * with HTTP response.
-   */
-  public static ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __itemEntitlementJson = JsonUtil.getObject(json, "item_entitlement");
-      if (__itemEntitlementJson != null) {
-        builder.itemEntitlement(ItemEntitlement.fromJson(__itemEntitlementJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse from JSON",
-          e);
-    }
-  }
-
-  /** Create a new builder for ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse. */
-  public static class Builder {
-
-    private ItemEntitlement itemEntitlement;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder itemEntitlement(ItemEntitlement itemEntitlement) {
-      this.itemEntitlement = itemEntitlement;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse build() {
-      return new ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse(this);
-    }
-  }
-
-  /** Get the itemEntitlement from the response. */
-  public ItemEntitlement getItemEntitlement() {
-    return itemEntitlement;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyRetrieveResponse.java
deleted file mode 100644
index f237c951..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.itemFamily;
-
-import com.chargebee.v4.core.models.itemFamily.ItemFamily;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ItemFamilyRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class ItemFamilyRetrieveResponse extends BaseResponse {
-  private final ItemFamily itemFamily;
-
-  private ItemFamilyRetrieveResponse(ItemFamily itemFamily, Response httpResponse) {
-    super(httpResponse);
-
-    this.itemFamily = itemFamily;
-  }
-
-  /** Parse JSON response into ItemFamilyRetrieveResponse object. */
-  public static ItemFamilyRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into ItemFamilyRetrieveResponse object with HTTP response. */
-  public static ItemFamilyRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      ItemFamily itemFamily = ItemFamily.fromJson(JsonUtil.getObject(json, "item_family"));
-
-      return new ItemFamilyRetrieveResponse(itemFamily, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse ItemFamilyRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the itemFamily from the response. */
-  public ItemFamily getItemFamily() {
-    return itemFamily;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceFindApplicableItemPricesResponse.java b/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceFindApplicableItemPricesResponse.java
deleted file mode 100644
index 02d955e2..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceFindApplicableItemPricesResponse.java
+++ /dev/null
@@ -1,179 +0,0 @@
-package com.chargebee.v4.core.responses.itemPrice;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.itemPrice.ItemPrice;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.ItemPriceService;
-import com.chargebee.v4.core.models.itemPrice.params.ItemPriceFindApplicableItemPricesParams;
-
-/**
- * Immutable response object for ItemPriceFindApplicableItemPrices operation. Contains paginated
- * list data.
- */
-public final class ItemPriceFindApplicableItemPricesResponse {
-
-  private final List<ItemPriceFindApplicableItemPricesItem> list;
-
-  private final String nextOffset;
-
-  private final String itemPriceId;
-
-  private final ItemPriceService service;
-  private final ItemPriceFindApplicableItemPricesParams originalParams;
-  private final Response httpResponse;
-
-  private ItemPriceFindApplicableItemPricesResponse(
-      List<ItemPriceFindApplicableItemPricesItem> list,
-      String nextOffset,
-      String itemPriceId,
-      ItemPriceService service,
-      ItemPriceFindApplicableItemPricesParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.itemPriceId = itemPriceId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into ItemPriceFindApplicableItemPricesResponse object (no service context).
-   * Use this when you only need to read a single page (no nextPage()).
-   */
-  public static ItemPriceFindApplicableItemPricesResponse fromJson(String json) {
-    try {
-
-      List<ItemPriceFindApplicableItemPricesItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(ItemPriceFindApplicableItemPricesItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new ItemPriceFindApplicableItemPricesResponse(
-          list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ItemPriceFindApplicableItemPricesResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into ItemPriceFindApplicableItemPricesResponse object with service context
-   * for pagination (enables nextPage()).
-   */
-  public static ItemPriceFindApplicableItemPricesResponse fromJson(
-      String json,
-      ItemPriceService service,
-      ItemPriceFindApplicableItemPricesParams originalParams,
-      String itemPriceId,
-      Response httpResponse) {
-    try {
-
-      List<ItemPriceFindApplicableItemPricesItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(ItemPriceFindApplicableItemPricesItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new ItemPriceFindApplicableItemPricesResponse(
-          list, nextOffset, itemPriceId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ItemPriceFindApplicableItemPricesResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<ItemPriceFindApplicableItemPricesItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public ItemPriceFindApplicableItemPricesResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    ItemPriceFindApplicableItemPricesParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : ItemPriceFindApplicableItemPricesParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.findApplicableItemPrices(itemPriceId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class ItemPriceFindApplicableItemPricesItem {
-
-    private ItemPrice itemPrice;
-
-    public ItemPrice getItemPrice() {
-      return itemPrice;
-    }
-
-    public static ItemPriceFindApplicableItemPricesItem fromJson(String json) {
-      ItemPriceFindApplicableItemPricesItem item = new ItemPriceFindApplicableItemPricesItem();
-
-      String __itemPriceJson = JsonUtil.getObject(json, "item_price");
-      if (__itemPriceJson != null) {
-        item.itemPrice = ItemPrice.fromJson(__itemPriceJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceRetrieveResponse.java
deleted file mode 100644
index d27d2c1e..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.itemPrice;
-
-import com.chargebee.v4.core.models.itemPrice.ItemPrice;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ItemPriceRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class ItemPriceRetrieveResponse extends BaseResponse {
-  private final ItemPrice itemPrice;
-
-  private ItemPriceRetrieveResponse(ItemPrice itemPrice, Response httpResponse) {
-    super(httpResponse);
-
-    this.itemPrice = itemPrice;
-  }
-
-  /** Parse JSON response into ItemPriceRetrieveResponse object. */
-  public static ItemPriceRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into ItemPriceRetrieveResponse object with HTTP response. */
-  public static ItemPriceRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      ItemPrice itemPrice = ItemPrice.fromJson(JsonUtil.getObject(json, "item_price"));
-
-      return new ItemPriceRetrieveResponse(itemPrice, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse ItemPriceRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the itemPrice from the response. */
-  public ItemPrice getItemPrice() {
-    return itemPrice;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/media/MediaCreateMediaAndAttachToItemResponse.java b/src/main/java/com/chargebee/v4/core/responses/media/MediaCreateMediaAndAttachToItemResponse.java
deleted file mode 100644
index 9d84cd1e..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/media/MediaCreateMediaAndAttachToItemResponse.java
+++ /dev/null
@@ -1,79 +0,0 @@
-package com.chargebee.v4.core.responses.media;
-
-import com.chargebee.v4.core.models.media.Media;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for MediaCreateMediaAndAttachToItem operation. Contains the response
- * data from the API.
- */
-public final class MediaCreateMediaAndAttachToItemResponse extends BaseResponse {
-  private final Media media;
-
-  private MediaCreateMediaAndAttachToItemResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.media = builder.media;
-  }
-
-  /** Parse JSON response into MediaCreateMediaAndAttachToItemResponse object. */
-  public static MediaCreateMediaAndAttachToItemResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into MediaCreateMediaAndAttachToItemResponse object with HTTP response. */
-  public static MediaCreateMediaAndAttachToItemResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __mediaJson = JsonUtil.getObject(json, "media");
-      if (__mediaJson != null) {
-        builder.media(Media.fromJson(__mediaJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse MediaCreateMediaAndAttachToItemResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for MediaCreateMediaAndAttachToItemResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for MediaCreateMediaAndAttachToItemResponse. */
-  public static class Builder {
-
-    private Media media;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder media(Media media) {
-      this.media = media;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public MediaCreateMediaAndAttachToItemResponse build() {
-      return new MediaCreateMediaAndAttachToItemResponse(this);
-    }
-  }
-
-  /** Get the media from the response. */
-  public Media getMedia() {
-    return media;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/offerEvent/OfferEventOfferEventsResponse.java b/src/main/java/com/chargebee/v4/core/responses/offerEvent/OfferEventOfferEventsResponse.java
deleted file mode 100644
index 3dd776d7..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/offerEvent/OfferEventOfferEventsResponse.java
+++ /dev/null
@@ -1,54 +0,0 @@
-package com.chargebee.v4.core.responses.offerEvent;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for OfferEventOfferEvents operation. Contains the response data from
- * the API.
- */
-public final class OfferEventOfferEventsResponse extends BaseResponse {
-
-  private OfferEventOfferEventsResponse(Builder builder) {
-    super(builder.httpResponse);
-  }
-
-  /** Parse JSON response into OfferEventOfferEventsResponse object. */
-  public static OfferEventOfferEventsResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into OfferEventOfferEventsResponse object with HTTP response. */
-  public static OfferEventOfferEventsResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse OfferEventOfferEventsResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for OfferEventOfferEventsResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for OfferEventOfferEventsResponse. */
-  public static class Builder {
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public OfferEventOfferEventsResponse build() {
-      return new OfferEventOfferEventsResponse(this);
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/offerFulfillment/OfferFulfillmentOfferFulfillmentsGetResponse.java b/src/main/java/com/chargebee/v4/core/responses/offerFulfillment/OfferFulfillmentOfferFulfillmentsGetResponse.java
deleted file mode 100644
index 4dd63b8d..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/offerFulfillment/OfferFulfillmentOfferFulfillmentsGetResponse.java
+++ /dev/null
@@ -1,50 +0,0 @@
-package com.chargebee.v4.core.responses.offerFulfillment;
-
-import com.chargebee.v4.core.models.offerFulfillment.OfferFulfillment;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for OfferFulfillmentOfferFulfillmentsGet operation. Contains the
- * response data from a single resource get operation.
- */
-public final class OfferFulfillmentOfferFulfillmentsGetResponse extends BaseResponse {
-  private final OfferFulfillment offerFulfillment;
-
-  private OfferFulfillmentOfferFulfillmentsGetResponse(
-      OfferFulfillment offerFulfillment, Response httpResponse) {
-    super(httpResponse);
-
-    this.offerFulfillment = offerFulfillment;
-  }
-
-  /** Parse JSON response into OfferFulfillmentOfferFulfillmentsGetResponse object. */
-  public static OfferFulfillmentOfferFulfillmentsGetResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into OfferFulfillmentOfferFulfillmentsGetResponse object with HTTP
-   * response.
-   */
-  public static OfferFulfillmentOfferFulfillmentsGetResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      OfferFulfillment offerFulfillment =
-          OfferFulfillment.fromJson(JsonUtil.getObject(json, "offer_fulfillment"));
-
-      return new OfferFulfillmentOfferFulfillmentsGetResponse(offerFulfillment, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse OfferFulfillmentOfferFulfillmentsGetResponse from JSON", e);
-    }
-  }
-
-  /** Get the offerFulfillment from the response. */
-  public OfferFulfillment getOfferFulfillment() {
-    return offerFulfillment;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/offerFulfillment/OfferFulfillmentOfferFulfillmentsResponse.java b/src/main/java/com/chargebee/v4/core/responses/offerFulfillment/OfferFulfillmentOfferFulfillmentsResponse.java
deleted file mode 100644
index 98315838..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/offerFulfillment/OfferFulfillmentOfferFulfillmentsResponse.java
+++ /dev/null
@@ -1,104 +0,0 @@
-package com.chargebee.v4.core.responses.offerFulfillment;
-
-import com.chargebee.v4.core.models.offerFulfillment.OfferFulfillment;
-
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for OfferFulfillmentOfferFulfillments operation. Contains the response
- * data from the API.
- */
-public final class OfferFulfillmentOfferFulfillmentsResponse extends BaseResponse {
-  private final OfferFulfillment offerFulfillment;
-
-  private final HostedPage hostedPage;
-
-  private OfferFulfillmentOfferFulfillmentsResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.offerFulfillment = builder.offerFulfillment;
-
-    this.hostedPage = builder.hostedPage;
-  }
-
-  /** Parse JSON response into OfferFulfillmentOfferFulfillmentsResponse object. */
-  public static OfferFulfillmentOfferFulfillmentsResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into OfferFulfillmentOfferFulfillmentsResponse object with HTTP response.
-   */
-  public static OfferFulfillmentOfferFulfillmentsResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __offerFulfillmentJson = JsonUtil.getObject(json, "offer_fulfillment");
-      if (__offerFulfillmentJson != null) {
-        builder.offerFulfillment(OfferFulfillment.fromJson(__offerFulfillmentJson));
-      }
-
-      String __hostedPageJson = JsonUtil.getObject(json, "hosted_page");
-      if (__hostedPageJson != null) {
-        builder.hostedPage(HostedPage.fromJson(__hostedPageJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse OfferFulfillmentOfferFulfillmentsResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for OfferFulfillmentOfferFulfillmentsResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for OfferFulfillmentOfferFulfillmentsResponse. */
-  public static class Builder {
-
-    private OfferFulfillment offerFulfillment;
-
-    private HostedPage hostedPage;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder offerFulfillment(OfferFulfillment offerFulfillment) {
-      this.offerFulfillment = offerFulfillment;
-      return this;
-    }
-
-    public Builder hostedPage(HostedPage hostedPage) {
-      this.hostedPage = hostedPage;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public OfferFulfillmentOfferFulfillmentsResponse build() {
-      return new OfferFulfillmentOfferFulfillmentsResponse(this);
-    }
-  }
-
-  /** Get the offerFulfillment from the response. */
-  public OfferFulfillment getOfferFulfillment() {
-    return offerFulfillment;
-  }
-
-  /** Get the hostedPage from the response. */
-  public HostedPage getHostedPage() {
-    return hostedPage;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/offerFulfillment/OfferFulfillmentOfferFulfillmentsUpdateResponse.java b/src/main/java/com/chargebee/v4/core/responses/offerFulfillment/OfferFulfillmentOfferFulfillmentsUpdateResponse.java
deleted file mode 100644
index 65055af5..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/offerFulfillment/OfferFulfillmentOfferFulfillmentsUpdateResponse.java
+++ /dev/null
@@ -1,82 +0,0 @@
-package com.chargebee.v4.core.responses.offerFulfillment;
-
-import com.chargebee.v4.core.models.offerFulfillment.OfferFulfillment;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for OfferFulfillmentOfferFulfillmentsUpdate operation. Contains the
- * response data from the API.
- */
-public final class OfferFulfillmentOfferFulfillmentsUpdateResponse extends BaseResponse {
-  private final OfferFulfillment offerFulfillment;
-
-  private OfferFulfillmentOfferFulfillmentsUpdateResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.offerFulfillment = builder.offerFulfillment;
-  }
-
-  /** Parse JSON response into OfferFulfillmentOfferFulfillmentsUpdateResponse object. */
-  public static OfferFulfillmentOfferFulfillmentsUpdateResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into OfferFulfillmentOfferFulfillmentsUpdateResponse object with HTTP
-   * response.
-   */
-  public static OfferFulfillmentOfferFulfillmentsUpdateResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __offerFulfillmentJson = JsonUtil.getObject(json, "offer_fulfillment");
-      if (__offerFulfillmentJson != null) {
-        builder.offerFulfillment(OfferFulfillment.fromJson(__offerFulfillmentJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse OfferFulfillmentOfferFulfillmentsUpdateResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for OfferFulfillmentOfferFulfillmentsUpdateResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for OfferFulfillmentOfferFulfillmentsUpdateResponse. */
-  public static class Builder {
-
-    private OfferFulfillment offerFulfillment;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder offerFulfillment(OfferFulfillment offerFulfillment) {
-      this.offerFulfillment = offerFulfillment;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public OfferFulfillmentOfferFulfillmentsUpdateResponse build() {
-      return new OfferFulfillmentOfferFulfillmentsUpdateResponse(this);
-    }
-  }
-
-  /** Get the offerFulfillment from the response. */
-  public OfferFulfillment getOfferFulfillment() {
-    return offerFulfillment;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/omnichannelOneTimeOrder/OmnichannelOneTimeOrderRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/omnichannelOneTimeOrder/OmnichannelOneTimeOrderRetrieveResponse.java
deleted file mode 100644
index ee0accff..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/omnichannelOneTimeOrder/OmnichannelOneTimeOrderRetrieveResponse.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.chargebee.v4.core.responses.omnichannelOneTimeOrder;
-
-import com.chargebee.v4.core.models.omnichannelOneTimeOrder.OmnichannelOneTimeOrder;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for OmnichannelOneTimeOrderRetrieve operation. Contains the response
- * data from a single resource get operation.
- */
-public final class OmnichannelOneTimeOrderRetrieveResponse extends BaseResponse {
-  private final OmnichannelOneTimeOrder omnichannelOneTimeOrder;
-
-  private OmnichannelOneTimeOrderRetrieveResponse(
-      OmnichannelOneTimeOrder omnichannelOneTimeOrder, Response httpResponse) {
-    super(httpResponse);
-
-    this.omnichannelOneTimeOrder = omnichannelOneTimeOrder;
-  }
-
-  /** Parse JSON response into OmnichannelOneTimeOrderRetrieveResponse object. */
-  public static OmnichannelOneTimeOrderRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into OmnichannelOneTimeOrderRetrieveResponse object with HTTP response. */
-  public static OmnichannelOneTimeOrderRetrieveResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      OmnichannelOneTimeOrder omnichannelOneTimeOrder =
-          OmnichannelOneTimeOrder.fromJson(JsonUtil.getObject(json, "omnichannel_one_time_order"));
-
-      return new OmnichannelOneTimeOrderRetrieveResponse(omnichannelOneTimeOrder, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse OmnichannelOneTimeOrderRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the omnichannelOneTimeOrder from the response. */
-  public OmnichannelOneTimeOrder getOmnichannelOneTimeOrder() {
-    return omnichannelOneTimeOrder;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/omnichannelSubscription/OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse.java b/src/main/java/com/chargebee/v4/core/responses/omnichannelSubscription/OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse.java
deleted file mode 100644
index afefc47d..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/omnichannelSubscription/OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse.java
+++ /dev/null
@@ -1,200 +0,0 @@
-package com.chargebee.v4.core.responses.omnichannelSubscription;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.omnichannelTransaction.OmnichannelTransaction;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.OmnichannelSubscriptionService;
-import com.chargebee.v4.core.models.omnichannelSubscription.params.OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams;
-
-/**
- * Immutable response object for
- * OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscription operation. Contains
- * paginated list data.
- */
-public final
-class OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse {
-
-  private final List<OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem>
-      list;
-
-  private final String nextOffset;
-
-  private final String omnichannelSubscriptionId;
-
-  private final OmnichannelSubscriptionService service;
-  private final OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams
-      originalParams;
-  private final Response httpResponse;
-
-  private OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse(
-      List<OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem> list,
-      String nextOffset,
-      String omnichannelSubscriptionId,
-      OmnichannelSubscriptionService service,
-      OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.omnichannelSubscriptionId = omnichannelSubscriptionId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into
-   * OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse object (no
-   * service context). Use this when you only need to read a single page (no nextPage()).
-   */
-  public static OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse
-      fromJson(String json) {
-    try {
-
-      List<OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(
-                  OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem
-                      ::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse(
-          list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse from JSON",
-          e);
-    }
-  }
-
-  /**
-   * Parse JSON response into
-   * OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse object with
-   * service context for pagination (enables nextPage()).
-   */
-  public static OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse
-      fromJson(
-          String json,
-          OmnichannelSubscriptionService service,
-          OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams
-              originalParams,
-          String omnichannelSubscriptionId,
-          Response httpResponse) {
-    try {
-
-      List<OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(
-                  OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem
-                      ::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse(
-          list, nextOffset, omnichannelSubscriptionId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse from JSON",
-          e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem>
-      getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse nextPage()
-      throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams
-                    .builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.omnichannelTransactionsForOmnichannelSubscription(
-        omnichannelSubscriptionId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem {
-
-    private OmnichannelTransaction omnichannelTransaction;
-
-    public OmnichannelTransaction getOmnichannelTransaction() {
-      return omnichannelTransaction;
-    }
-
-    public static OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem
-        fromJson(String json) {
-      OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem item =
-          new OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem();
-
-      String __omnichannelTransactionJson = JsonUtil.getObject(json, "omnichannel_transaction");
-      if (__omnichannelTransactionJson != null) {
-        item.omnichannelTransaction = OmnichannelTransaction.fromJson(__omnichannelTransactionJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/omnichannelSubscription/OmnichannelSubscriptionRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/omnichannelSubscription/OmnichannelSubscriptionRetrieveResponse.java
deleted file mode 100644
index ae169cd4..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/omnichannelSubscription/OmnichannelSubscriptionRetrieveResponse.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.chargebee.v4.core.responses.omnichannelSubscription;
-
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for OmnichannelSubscriptionRetrieve operation. Contains the response
- * data from a single resource get operation.
- */
-public final class OmnichannelSubscriptionRetrieveResponse extends BaseResponse {
-  private final OmnichannelSubscription omnichannelSubscription;
-
-  private OmnichannelSubscriptionRetrieveResponse(
-      OmnichannelSubscription omnichannelSubscription, Response httpResponse) {
-    super(httpResponse);
-
-    this.omnichannelSubscription = omnichannelSubscription;
-  }
-
-  /** Parse JSON response into OmnichannelSubscriptionRetrieveResponse object. */
-  public static OmnichannelSubscriptionRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into OmnichannelSubscriptionRetrieveResponse object with HTTP response. */
-  public static OmnichannelSubscriptionRetrieveResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      OmnichannelSubscription omnichannelSubscription =
-          OmnichannelSubscription.fromJson(JsonUtil.getObject(json, "omnichannel_subscription"));
-
-      return new OmnichannelSubscriptionRetrieveResponse(omnichannelSubscription, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse OmnichannelSubscriptionRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the omnichannelSubscription from the response. */
-  public OmnichannelSubscription getOmnichannelSubscription() {
-    return omnichannelSubscription;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/omnichannelSubscriptionItem/OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse.java b/src/main/java/com/chargebee/v4/core/responses/omnichannelSubscriptionItem/OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse.java
deleted file mode 100644
index f4e849f5..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/omnichannelSubscriptionItem/OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse.java
+++ /dev/null
@@ -1,189 +0,0 @@
-package com.chargebee.v4.core.responses.omnichannelSubscriptionItem;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.OmnichannelSubscriptionItemService;
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.params.OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams;
-
-/**
- * Immutable response object for OmnichannelSubscriptionItemListOmniSubItemScheduleChanges
- * operation. Contains paginated list data.
- */
-public final class OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse {
-
-  private final List<OmnichannelSubscriptionItemListOmniSubItemScheduleChangesItem> list;
-
-  private final String nextOffset;
-
-  private final String omnichannelSubscriptionItemId;
-
-  private final OmnichannelSubscriptionItemService service;
-  private final OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams originalParams;
-  private final Response httpResponse;
-
-  private OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse(
-      List<OmnichannelSubscriptionItemListOmniSubItemScheduleChangesItem> list,
-      String nextOffset,
-      String omnichannelSubscriptionItemId,
-      OmnichannelSubscriptionItemService service,
-      OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.omnichannelSubscriptionItemId = omnichannelSubscriptionItemId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse
-   * object (no service context). Use this when you only need to read a single page (no nextPage()).
-   */
-  public static OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse fromJson(
-      String json) {
-    try {
-
-      List<OmnichannelSubscriptionItemListOmniSubItemScheduleChangesItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(OmnichannelSubscriptionItemListOmniSubItemScheduleChangesItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse(
-          list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse from JSON",
-          e);
-    }
-  }
-
-  /**
-   * Parse JSON response into OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse
-   * object with service context for pagination (enables nextPage()).
-   */
-  public static OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse fromJson(
-      String json,
-      OmnichannelSubscriptionItemService service,
-      OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams originalParams,
-      String omnichannelSubscriptionItemId,
-      Response httpResponse) {
-    try {
-
-      List<OmnichannelSubscriptionItemListOmniSubItemScheduleChangesItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(OmnichannelSubscriptionItemListOmniSubItemScheduleChangesItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse(
-          list, nextOffset, omnichannelSubscriptionItemId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse from JSON",
-          e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<OmnichannelSubscriptionItemListOmniSubItemScheduleChangesItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse nextPage()
-      throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.listOmniSubItemScheduleChanges(omnichannelSubscriptionItemId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class OmnichannelSubscriptionItemListOmniSubItemScheduleChangesItem {
-
-    private OmnichannelSubscriptionItemScheduledChange omnichannelSubscriptionItemScheduledChange;
-
-    public OmnichannelSubscriptionItemScheduledChange
-        getOmnichannelSubscriptionItemScheduledChange() {
-      return omnichannelSubscriptionItemScheduledChange;
-    }
-
-    public static OmnichannelSubscriptionItemListOmniSubItemScheduleChangesItem fromJson(
-        String json) {
-      OmnichannelSubscriptionItemListOmniSubItemScheduleChangesItem item =
-          new OmnichannelSubscriptionItemListOmniSubItemScheduleChangesItem();
-
-      String __omnichannelSubscriptionItemScheduledChangeJson =
-          JsonUtil.getObject(json, "omnichannel_subscription_item_scheduled_change");
-      if (__omnichannelSubscriptionItemScheduledChangeJson != null) {
-        item.omnichannelSubscriptionItemScheduledChange =
-            OmnichannelSubscriptionItemScheduledChange.fromJson(
-                __omnichannelSubscriptionItemScheduledChangeJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/order/OrderAssignOrderNumberResponse.java b/src/main/java/com/chargebee/v4/core/responses/order/OrderAssignOrderNumberResponse.java
deleted file mode 100644
index 722c86ea..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/order/OrderAssignOrderNumberResponse.java
+++ /dev/null
@@ -1,77 +0,0 @@
-package com.chargebee.v4.core.responses.order;
-
-import com.chargebee.v4.core.models.order.Order;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for OrderAssignOrderNumber operation. Contains the response data from
- * the API.
- */
-public final class OrderAssignOrderNumberResponse extends BaseResponse {
-  private final Order order;
-
-  private OrderAssignOrderNumberResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.order = builder.order;
-  }
-
-  /** Parse JSON response into OrderAssignOrderNumberResponse object. */
-  public static OrderAssignOrderNumberResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into OrderAssignOrderNumberResponse object with HTTP response. */
-  public static OrderAssignOrderNumberResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __orderJson = JsonUtil.getObject(json, "order");
-      if (__orderJson != null) {
-        builder.order(Order.fromJson(__orderJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse OrderAssignOrderNumberResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for OrderAssignOrderNumberResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for OrderAssignOrderNumberResponse. */
-  public static class Builder {
-
-    private Order order;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder order(Order order) {
-      this.order = order;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public OrderAssignOrderNumberResponse build() {
-      return new OrderAssignOrderNumberResponse(this);
-    }
-  }
-
-  /** Get the order from the response. */
-  public Order getOrder() {
-    return order;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/order/OrderImportOrderResponse.java b/src/main/java/com/chargebee/v4/core/responses/order/OrderImportOrderResponse.java
deleted file mode 100644
index 2d1196dd..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/order/OrderImportOrderResponse.java
+++ /dev/null
@@ -1,77 +0,0 @@
-package com.chargebee.v4.core.responses.order;
-
-import com.chargebee.v4.core.models.order.Order;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for OrderImportOrder operation. Contains the response data from the
- * API.
- */
-public final class OrderImportOrderResponse extends BaseResponse {
-  private final Order order;
-
-  private OrderImportOrderResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.order = builder.order;
-  }
-
-  /** Parse JSON response into OrderImportOrderResponse object. */
-  public static OrderImportOrderResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into OrderImportOrderResponse object with HTTP response. */
-  public static OrderImportOrderResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __orderJson = JsonUtil.getObject(json, "order");
-      if (__orderJson != null) {
-        builder.order(Order.fromJson(__orderJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse OrderImportOrderResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for OrderImportOrderResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for OrderImportOrderResponse. */
-  public static class Builder {
-
-    private Order order;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder order(Order order) {
-      this.order = order;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public OrderImportOrderResponse build() {
-      return new OrderImportOrderResponse(this);
-    }
-  }
-
-  /** Get the order from the response. */
-  public Order getOrder() {
-    return order;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/order/OrderOrdersForInvoiceResponse.java b/src/main/java/com/chargebee/v4/core/responses/order/OrderOrdersForInvoiceResponse.java
deleted file mode 100644
index bf5e147d..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/order/OrderOrdersForInvoiceResponse.java
+++ /dev/null
@@ -1,173 +0,0 @@
-package com.chargebee.v4.core.responses.order;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.order.Order;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.OrderService;
-import com.chargebee.v4.core.models.order.params.OrderOrdersForInvoiceParams;
-
-/** Immutable response object for OrderOrdersForInvoice operation. Contains paginated list data. */
-public final class OrderOrdersForInvoiceResponse {
-
-  private final List<OrderOrdersForInvoiceItem> list;
-
-  private final String nextOffset;
-
-  private final String invoiceId;
-
-  private final OrderService service;
-  private final OrderOrdersForInvoiceParams originalParams;
-  private final Response httpResponse;
-
-  private OrderOrdersForInvoiceResponse(
-      List<OrderOrdersForInvoiceItem> list,
-      String nextOffset,
-      String invoiceId,
-      OrderService service,
-      OrderOrdersForInvoiceParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.invoiceId = invoiceId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into OrderOrdersForInvoiceResponse object (no service context). Use this
-   * when you only need to read a single page (no nextPage()).
-   */
-  public static OrderOrdersForInvoiceResponse fromJson(String json) {
-    try {
-
-      List<OrderOrdersForInvoiceItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(OrderOrdersForInvoiceItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new OrderOrdersForInvoiceResponse(list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse OrderOrdersForInvoiceResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into OrderOrdersForInvoiceResponse object with service context for
-   * pagination (enables nextPage()).
-   */
-  public static OrderOrdersForInvoiceResponse fromJson(
-      String json,
-      OrderService service,
-      OrderOrdersForInvoiceParams originalParams,
-      String invoiceId,
-      Response httpResponse) {
-    try {
-
-      List<OrderOrdersForInvoiceItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(OrderOrdersForInvoiceItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new OrderOrdersForInvoiceResponse(
-          list, nextOffset, invoiceId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse OrderOrdersForInvoiceResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<OrderOrdersForInvoiceItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public OrderOrdersForInvoiceResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    OrderOrdersForInvoiceParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : OrderOrdersForInvoiceParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.ordersForInvoice(invoiceId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class OrderOrdersForInvoiceItem {
-
-    private Order order;
-
-    public Order getOrder() {
-      return order;
-    }
-
-    public static OrderOrdersForInvoiceItem fromJson(String json) {
-      OrderOrdersForInvoiceItem item = new OrderOrdersForInvoiceItem();
-
-      String __orderJson = JsonUtil.getObject(json, "order");
-      if (__orderJson != null) {
-        item.order = Order.fromJson(__orderJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/order/OrderRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/order/OrderRetrieveResponse.java
deleted file mode 100644
index 35e5f251..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/order/OrderRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.order;
-
-import com.chargebee.v4.core.models.order.Order;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for OrderRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class OrderRetrieveResponse extends BaseResponse {
-  private final Order order;
-
-  private OrderRetrieveResponse(Order order, Response httpResponse) {
-    super(httpResponse);
-
-    this.order = order;
-  }
-
-  /** Parse JSON response into OrderRetrieveResponse object. */
-  public static OrderRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into OrderRetrieveResponse object with HTTP response. */
-  public static OrderRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Order order = Order.fromJson(JsonUtil.getObject(json, "order"));
-
-      return new OrderRetrieveResponse(order, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse OrderRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the order from the response. */
-  public Order getOrder() {
-    return order;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentIntent/PaymentIntentRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/paymentIntent/PaymentIntentRetrieveResponse.java
deleted file mode 100644
index d4623c3b..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/paymentIntent/PaymentIntentRetrieveResponse.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.chargebee.v4.core.responses.paymentIntent;
-
-import com.chargebee.v4.core.models.paymentIntent.PaymentIntent;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for PaymentIntentRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class PaymentIntentRetrieveResponse extends BaseResponse {
-  private final PaymentIntent paymentIntent;
-
-  private PaymentIntentRetrieveResponse(PaymentIntent paymentIntent, Response httpResponse) {
-    super(httpResponse);
-
-    this.paymentIntent = paymentIntent;
-  }
-
-  /** Parse JSON response into PaymentIntentRetrieveResponse object. */
-  public static PaymentIntentRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into PaymentIntentRetrieveResponse object with HTTP response. */
-  public static PaymentIntentRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      PaymentIntent paymentIntent =
-          PaymentIntent.fromJson(JsonUtil.getObject(json, "payment_intent"));
-
-      return new PaymentIntentRetrieveResponse(paymentIntent, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse PaymentIntentRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the paymentIntent from the response. */
-  public PaymentIntent getPaymentIntent() {
-    return paymentIntent;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentScheduleScheme/PaymentScheduleSchemeRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/paymentScheduleScheme/PaymentScheduleSchemeRetrieveResponse.java
deleted file mode 100644
index 4391945b..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/paymentScheduleScheme/PaymentScheduleSchemeRetrieveResponse.java
+++ /dev/null
@@ -1,46 +0,0 @@
-package com.chargebee.v4.core.responses.paymentScheduleScheme;
-
-import com.chargebee.v4.core.models.paymentScheduleScheme.PaymentScheduleScheme;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for PaymentScheduleSchemeRetrieve operation. Contains the response data
- * from a single resource get operation.
- */
-public final class PaymentScheduleSchemeRetrieveResponse extends BaseResponse {
-  private final PaymentScheduleScheme paymentScheduleScheme;
-
-  private PaymentScheduleSchemeRetrieveResponse(
-      PaymentScheduleScheme paymentScheduleScheme, Response httpResponse) {
-    super(httpResponse);
-
-    this.paymentScheduleScheme = paymentScheduleScheme;
-  }
-
-  /** Parse JSON response into PaymentScheduleSchemeRetrieveResponse object. */
-  public static PaymentScheduleSchemeRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into PaymentScheduleSchemeRetrieveResponse object with HTTP response. */
-  public static PaymentScheduleSchemeRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      PaymentScheduleScheme paymentScheduleScheme =
-          PaymentScheduleScheme.fromJson(JsonUtil.getObject(json, "payment_schedule_scheme"));
-
-      return new PaymentScheduleSchemeRetrieveResponse(paymentScheduleScheme, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse PaymentScheduleSchemeRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the paymentScheduleScheme from the response. */
-  public PaymentScheduleScheme getPaymentScheduleScheme() {
-    return paymentScheduleScheme;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateVoucherPaymentSourceResponse.java b/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateVoucherPaymentSourceResponse.java
deleted file mode 100644
index e0904beb..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateVoucherPaymentSourceResponse.java
+++ /dev/null
@@ -1,105 +0,0 @@
-package com.chargebee.v4.core.responses.paymentSource;
-
-import com.chargebee.v4.core.models.customer.Customer;
-
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for PaymentSourceCreateVoucherPaymentSource operation. Contains the
- * response data from the API.
- */
-public final class PaymentSourceCreateVoucherPaymentSourceResponse extends BaseResponse {
-  private final Customer customer;
-
-  private final PaymentSource paymentSource;
-
-  private PaymentSourceCreateVoucherPaymentSourceResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.customer = builder.customer;
-
-    this.paymentSource = builder.paymentSource;
-  }
-
-  /** Parse JSON response into PaymentSourceCreateVoucherPaymentSourceResponse object. */
-  public static PaymentSourceCreateVoucherPaymentSourceResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into PaymentSourceCreateVoucherPaymentSourceResponse object with HTTP
-   * response.
-   */
-  public static PaymentSourceCreateVoucherPaymentSourceResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __customerJson = JsonUtil.getObject(json, "customer");
-      if (__customerJson != null) {
-        builder.customer(Customer.fromJson(__customerJson));
-      }
-
-      String __paymentSourceJson = JsonUtil.getObject(json, "payment_source");
-      if (__paymentSourceJson != null) {
-        builder.paymentSource(PaymentSource.fromJson(__paymentSourceJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse PaymentSourceCreateVoucherPaymentSourceResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for PaymentSourceCreateVoucherPaymentSourceResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for PaymentSourceCreateVoucherPaymentSourceResponse. */
-  public static class Builder {
-
-    private Customer customer;
-
-    private PaymentSource paymentSource;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder customer(Customer customer) {
-      this.customer = customer;
-      return this;
-    }
-
-    public Builder paymentSource(PaymentSource paymentSource) {
-      this.paymentSource = paymentSource;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public PaymentSourceCreateVoucherPaymentSourceResponse build() {
-      return new PaymentSourceCreateVoucherPaymentSourceResponse(this);
-    }
-  }
-
-  /** Get the customer from the response. */
-  public Customer getCustomer() {
-    return customer;
-  }
-
-  /** Get the paymentSource from the response. */
-  public PaymentSource getPaymentSource() {
-    return paymentSource;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceExportPaymentSourceResponse.java b/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceExportPaymentSourceResponse.java
deleted file mode 100644
index d3c82724..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceExportPaymentSourceResponse.java
+++ /dev/null
@@ -1,82 +0,0 @@
-package com.chargebee.v4.core.responses.paymentSource;
-
-import com.chargebee.v4.core.models.thirdPartyPaymentMethod.ThirdPartyPaymentMethod;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for PaymentSourceExportPaymentSource operation. Contains the response
- * data from the API.
- */
-public final class PaymentSourceExportPaymentSourceResponse extends BaseResponse {
-  private final ThirdPartyPaymentMethod thirdPartyPaymentMethod;
-
-  private PaymentSourceExportPaymentSourceResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.thirdPartyPaymentMethod = builder.thirdPartyPaymentMethod;
-  }
-
-  /** Parse JSON response into PaymentSourceExportPaymentSourceResponse object. */
-  public static PaymentSourceExportPaymentSourceResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into PaymentSourceExportPaymentSourceResponse object with HTTP response.
-   */
-  public static PaymentSourceExportPaymentSourceResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __thirdPartyPaymentMethodJson = JsonUtil.getObject(json, "third_party_payment_method");
-      if (__thirdPartyPaymentMethodJson != null) {
-        builder.thirdPartyPaymentMethod(
-            ThirdPartyPaymentMethod.fromJson(__thirdPartyPaymentMethodJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse PaymentSourceExportPaymentSourceResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for PaymentSourceExportPaymentSourceResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for PaymentSourceExportPaymentSourceResponse. */
-  public static class Builder {
-
-    private ThirdPartyPaymentMethod thirdPartyPaymentMethod;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder thirdPartyPaymentMethod(ThirdPartyPaymentMethod thirdPartyPaymentMethod) {
-      this.thirdPartyPaymentMethod = thirdPartyPaymentMethod;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public PaymentSourceExportPaymentSourceResponse build() {
-      return new PaymentSourceExportPaymentSourceResponse(this);
-    }
-  }
-
-  /** Get the thirdPartyPaymentMethod from the response. */
-  public ThirdPartyPaymentMethod getThirdPartyPaymentMethod() {
-    return thirdPartyPaymentMethod;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceRetrieveResponse.java
deleted file mode 100644
index 68de9af9..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceRetrieveResponse.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.chargebee.v4.core.responses.paymentSource;
-
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for PaymentSourceRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class PaymentSourceRetrieveResponse extends BaseResponse {
-  private final PaymentSource paymentSource;
-
-  private PaymentSourceRetrieveResponse(PaymentSource paymentSource, Response httpResponse) {
-    super(httpResponse);
-
-    this.paymentSource = paymentSource;
-  }
-
-  /** Parse JSON response into PaymentSourceRetrieveResponse object. */
-  public static PaymentSourceRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into PaymentSourceRetrieveResponse object with HTTP response. */
-  public static PaymentSourceRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      PaymentSource paymentSource =
-          PaymentSource.fromJson(JsonUtil.getObject(json, "payment_source"));
-
-      return new PaymentSourceRetrieveResponse(paymentSource, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse PaymentSourceRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the paymentSource from the response. */
-  public PaymentSource getPaymentSource() {
-    return paymentSource;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentVoucher/PaymentVoucherPaymentVouchersForCustomerResponse.java b/src/main/java/com/chargebee/v4/core/responses/paymentVoucher/PaymentVoucherPaymentVouchersForCustomerResponse.java
deleted file mode 100644
index 6f55c101..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/paymentVoucher/PaymentVoucherPaymentVouchersForCustomerResponse.java
+++ /dev/null
@@ -1,180 +0,0 @@
-package com.chargebee.v4.core.responses.paymentVoucher;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.paymentVoucher.PaymentVoucher;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.PaymentVoucherService;
-import com.chargebee.v4.core.models.paymentVoucher.params.PaymentVoucherPaymentVouchersForCustomerParams;
-
-/**
- * Immutable response object for PaymentVoucherPaymentVouchersForCustomer operation. Contains
- * paginated list data.
- */
-public final class PaymentVoucherPaymentVouchersForCustomerResponse {
-
-  private final List<PaymentVoucherPaymentVouchersForCustomerItem> list;
-
-  private final String nextOffset;
-
-  private final String customerId;
-
-  private final PaymentVoucherService service;
-  private final PaymentVoucherPaymentVouchersForCustomerParams originalParams;
-  private final Response httpResponse;
-
-  private PaymentVoucherPaymentVouchersForCustomerResponse(
-      List<PaymentVoucherPaymentVouchersForCustomerItem> list,
-      String nextOffset,
-      String customerId,
-      PaymentVoucherService service,
-      PaymentVoucherPaymentVouchersForCustomerParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.customerId = customerId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into PaymentVoucherPaymentVouchersForCustomerResponse object (no service
-   * context). Use this when you only need to read a single page (no nextPage()).
-   */
-  public static PaymentVoucherPaymentVouchersForCustomerResponse fromJson(String json) {
-    try {
-
-      List<PaymentVoucherPaymentVouchersForCustomerItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(PaymentVoucherPaymentVouchersForCustomerItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new PaymentVoucherPaymentVouchersForCustomerResponse(
-          list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse PaymentVoucherPaymentVouchersForCustomerResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into PaymentVoucherPaymentVouchersForCustomerResponse object with service
-   * context for pagination (enables nextPage()).
-   */
-  public static PaymentVoucherPaymentVouchersForCustomerResponse fromJson(
-      String json,
-      PaymentVoucherService service,
-      PaymentVoucherPaymentVouchersForCustomerParams originalParams,
-      String customerId,
-      Response httpResponse) {
-    try {
-
-      List<PaymentVoucherPaymentVouchersForCustomerItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(PaymentVoucherPaymentVouchersForCustomerItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new PaymentVoucherPaymentVouchersForCustomerResponse(
-          list, nextOffset, customerId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse PaymentVoucherPaymentVouchersForCustomerResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<PaymentVoucherPaymentVouchersForCustomerItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public PaymentVoucherPaymentVouchersForCustomerResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    PaymentVoucherPaymentVouchersForCustomerParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : PaymentVoucherPaymentVouchersForCustomerParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.paymentVouchersForCustomer(customerId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class PaymentVoucherPaymentVouchersForCustomerItem {
-
-    private PaymentVoucher paymentVoucher;
-
-    public PaymentVoucher getPaymentVoucher() {
-      return paymentVoucher;
-    }
-
-    public static PaymentVoucherPaymentVouchersForCustomerItem fromJson(String json) {
-      PaymentVoucherPaymentVouchersForCustomerItem item =
-          new PaymentVoucherPaymentVouchersForCustomerItem();
-
-      String __paymentVoucherJson = JsonUtil.getObject(json, "payment_voucher");
-      if (__paymentVoucherJson != null) {
-        item.paymentVoucher = PaymentVoucher.fromJson(__paymentVoucherJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentVoucher/PaymentVoucherPaymentVouchersForInvoiceResponse.java b/src/main/java/com/chargebee/v4/core/responses/paymentVoucher/PaymentVoucherPaymentVouchersForInvoiceResponse.java
deleted file mode 100644
index b1b11f0a..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/paymentVoucher/PaymentVoucherPaymentVouchersForInvoiceResponse.java
+++ /dev/null
@@ -1,180 +0,0 @@
-package com.chargebee.v4.core.responses.paymentVoucher;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.paymentVoucher.PaymentVoucher;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.PaymentVoucherService;
-import com.chargebee.v4.core.models.paymentVoucher.params.PaymentVoucherPaymentVouchersForInvoiceParams;
-
-/**
- * Immutable response object for PaymentVoucherPaymentVouchersForInvoice operation. Contains
- * paginated list data.
- */
-public final class PaymentVoucherPaymentVouchersForInvoiceResponse {
-
-  private final List<PaymentVoucherPaymentVouchersForInvoiceItem> list;
-
-  private final String nextOffset;
-
-  private final String invoiceId;
-
-  private final PaymentVoucherService service;
-  private final PaymentVoucherPaymentVouchersForInvoiceParams originalParams;
-  private final Response httpResponse;
-
-  private PaymentVoucherPaymentVouchersForInvoiceResponse(
-      List<PaymentVoucherPaymentVouchersForInvoiceItem> list,
-      String nextOffset,
-      String invoiceId,
-      PaymentVoucherService service,
-      PaymentVoucherPaymentVouchersForInvoiceParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.invoiceId = invoiceId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into PaymentVoucherPaymentVouchersForInvoiceResponse object (no service
-   * context). Use this when you only need to read a single page (no nextPage()).
-   */
-  public static PaymentVoucherPaymentVouchersForInvoiceResponse fromJson(String json) {
-    try {
-
-      List<PaymentVoucherPaymentVouchersForInvoiceItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(PaymentVoucherPaymentVouchersForInvoiceItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new PaymentVoucherPaymentVouchersForInvoiceResponse(
-          list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse PaymentVoucherPaymentVouchersForInvoiceResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into PaymentVoucherPaymentVouchersForInvoiceResponse object with service
-   * context for pagination (enables nextPage()).
-   */
-  public static PaymentVoucherPaymentVouchersForInvoiceResponse fromJson(
-      String json,
-      PaymentVoucherService service,
-      PaymentVoucherPaymentVouchersForInvoiceParams originalParams,
-      String invoiceId,
-      Response httpResponse) {
-    try {
-
-      List<PaymentVoucherPaymentVouchersForInvoiceItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(PaymentVoucherPaymentVouchersForInvoiceItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new PaymentVoucherPaymentVouchersForInvoiceResponse(
-          list, nextOffset, invoiceId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse PaymentVoucherPaymentVouchersForInvoiceResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<PaymentVoucherPaymentVouchersForInvoiceItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public PaymentVoucherPaymentVouchersForInvoiceResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    PaymentVoucherPaymentVouchersForInvoiceParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : PaymentVoucherPaymentVouchersForInvoiceParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.paymentVouchersForInvoice(invoiceId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class PaymentVoucherPaymentVouchersForInvoiceItem {
-
-    private PaymentVoucher paymentVoucher;
-
-    public PaymentVoucher getPaymentVoucher() {
-      return paymentVoucher;
-    }
-
-    public static PaymentVoucherPaymentVouchersForInvoiceItem fromJson(String json) {
-      PaymentVoucherPaymentVouchersForInvoiceItem item =
-          new PaymentVoucherPaymentVouchersForInvoiceItem();
-
-      String __paymentVoucherJson = JsonUtil.getObject(json, "payment_voucher");
-      if (__paymentVoucherJson != null) {
-        item.paymentVoucher = PaymentVoucher.fromJson(__paymentVoucherJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentVoucher/PaymentVoucherRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/paymentVoucher/PaymentVoucherRetrieveResponse.java
deleted file mode 100644
index ae7ca757..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/paymentVoucher/PaymentVoucherRetrieveResponse.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.chargebee.v4.core.responses.paymentVoucher;
-
-import com.chargebee.v4.core.models.paymentVoucher.PaymentVoucher;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for PaymentVoucherRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class PaymentVoucherRetrieveResponse extends BaseResponse {
-  private final PaymentVoucher paymentVoucher;
-
-  private PaymentVoucherRetrieveResponse(PaymentVoucher paymentVoucher, Response httpResponse) {
-    super(httpResponse);
-
-    this.paymentVoucher = paymentVoucher;
-  }
-
-  /** Parse JSON response into PaymentVoucherRetrieveResponse object. */
-  public static PaymentVoucherRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into PaymentVoucherRetrieveResponse object with HTTP response. */
-  public static PaymentVoucherRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      PaymentVoucher paymentVoucher =
-          PaymentVoucher.fromJson(JsonUtil.getObject(json, "payment_voucher"));
-
-      return new PaymentVoucherRetrieveResponse(paymentVoucher, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse PaymentVoucherRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the paymentVoucher from the response. */
-  public PaymentVoucher getPaymentVoucher() {
-    return paymentVoucher;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2Migration/Pc2MigrationRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/pc2Migration/Pc2MigrationRetrieveResponse.java
deleted file mode 100644
index 194af29c..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/pc2Migration/Pc2MigrationRetrieveResponse.java
+++ /dev/null
@@ -1,41 +0,0 @@
-package com.chargebee.v4.core.responses.pc2Migration;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for Pc2MigrationRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class Pc2MigrationRetrieveResponse extends BaseResponse {
-  private final Object pc2Migration;
-
-  private Pc2MigrationRetrieveResponse(Object pc2Migration, Response httpResponse) {
-    super(httpResponse);
-
-    this.pc2Migration = pc2Migration;
-  }
-
-  /** Parse JSON response into Pc2MigrationRetrieveResponse object. */
-  public static Pc2MigrationRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into Pc2MigrationRetrieveResponse object with HTTP response. */
-  public static Pc2MigrationRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Object pc2Migration = JsonUtil.getObject(json, "pc2_migration");
-
-      return new Pc2MigrationRetrieveResponse(pc2Migration, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse Pc2MigrationRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the pc2Migration from the response. */
-  public Object getPc2Migration() {
-    return pc2Migration;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemRetrieveResponse.java
deleted file mode 100644
index c96a8a99..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemRetrieveResponse.java
+++ /dev/null
@@ -1,41 +0,0 @@
-package com.chargebee.v4.core.responses.pc2MigrationItem;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for Pc2MigrationItemRetrieve operation. Contains the response data from
- * a single resource get operation.
- */
-public final class Pc2MigrationItemRetrieveResponse extends BaseResponse {
-  private final Object pc2MigrationItem;
-
-  private Pc2MigrationItemRetrieveResponse(Object pc2MigrationItem, Response httpResponse) {
-    super(httpResponse);
-
-    this.pc2MigrationItem = pc2MigrationItem;
-  }
-
-  /** Parse JSON response into Pc2MigrationItemRetrieveResponse object. */
-  public static Pc2MigrationItemRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into Pc2MigrationItemRetrieveResponse object with HTTP response. */
-  public static Pc2MigrationItemRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Object pc2MigrationItem = JsonUtil.getObject(json, "pc2_migration_item");
-
-      return new Pc2MigrationItemRetrieveResponse(pc2MigrationItem, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse Pc2MigrationItemRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the pc2MigrationItem from the response. */
-  public Object getPc2MigrationItem() {
-    return pc2MigrationItem;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyRetrieveResponse.java
deleted file mode 100644
index 9f3a7229..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyRetrieveResponse.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.chargebee.v4.core.responses.pc2MigrationItemFamily;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for Pc2MigrationItemFamilyRetrieve operation. Contains the response
- * data from a single resource get operation.
- */
-public final class Pc2MigrationItemFamilyRetrieveResponse extends BaseResponse {
-  private final Object pc2MigrationItemFamily;
-
-  private Pc2MigrationItemFamilyRetrieveResponse(
-      Object pc2MigrationItemFamily, Response httpResponse) {
-    super(httpResponse);
-
-    this.pc2MigrationItemFamily = pc2MigrationItemFamily;
-  }
-
-  /** Parse JSON response into Pc2MigrationItemFamilyRetrieveResponse object. */
-  public static Pc2MigrationItemFamilyRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into Pc2MigrationItemFamilyRetrieveResponse object with HTTP response. */
-  public static Pc2MigrationItemFamilyRetrieveResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      Object pc2MigrationItemFamily = JsonUtil.getObject(json, "pc2_migration_item_family");
-
-      return new Pc2MigrationItemFamilyRetrieveResponse(pc2MigrationItemFamily, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse Pc2MigrationItemFamilyRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the pc2MigrationItemFamily from the response. */
-  public Object getPc2MigrationItemFamily() {
-    return pc2MigrationItemFamily;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemPrice/Pc2MigrationItemPriceRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemPrice/Pc2MigrationItemPriceRetrieveResponse.java
deleted file mode 100644
index fcbcc4fc..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemPrice/Pc2MigrationItemPriceRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.pc2MigrationItemPrice;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for Pc2MigrationItemPriceRetrieve operation. Contains the response data
- * from a single resource get operation.
- */
-public final class Pc2MigrationItemPriceRetrieveResponse extends BaseResponse {
-  private final Object pc2MigrationItemPrice;
-
-  private Pc2MigrationItemPriceRetrieveResponse(
-      Object pc2MigrationItemPrice, Response httpResponse) {
-    super(httpResponse);
-
-    this.pc2MigrationItemPrice = pc2MigrationItemPrice;
-  }
-
-  /** Parse JSON response into Pc2MigrationItemPriceRetrieveResponse object. */
-  public static Pc2MigrationItemPriceRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into Pc2MigrationItemPriceRetrieveResponse object with HTTP response. */
-  public static Pc2MigrationItemPriceRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Object pc2MigrationItemPrice = JsonUtil.getObject(json, "pc2_migration_item_price");
-
-      return new Pc2MigrationItemPriceRetrieveResponse(pc2MigrationItemPrice, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse Pc2MigrationItemPriceRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the pc2MigrationItemPrice from the response. */
-  public Object getPc2MigrationItemPrice() {
-    return pc2MigrationItemPrice;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/personalizedOffer/PersonalizedOfferPersonalizedOffersResponse.java b/src/main/java/com/chargebee/v4/core/responses/personalizedOffer/PersonalizedOfferPersonalizedOffersResponse.java
deleted file mode 100644
index 09a00813..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/personalizedOffer/PersonalizedOfferPersonalizedOffersResponse.java
+++ /dev/null
@@ -1,125 +0,0 @@
-package com.chargebee.v4.core.responses.personalizedOffer;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.brand.Brand;
-
-import com.chargebee.v4.core.models.personalizedOffer.PersonalizedOffer;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import java.sql.Timestamp;
-
-/**
- * Immutable response object for PersonalizedOfferPersonalizedOffers operation. Contains the
- * response data from the API.
- */
-public final class PersonalizedOfferPersonalizedOffersResponse extends BaseResponse {
-  private final List<PersonalizedOffer> personalizedOffers;
-
-  private final Brand brand;
-
-  private final Timestamp expiresAt;
-
-  private PersonalizedOfferPersonalizedOffersResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.personalizedOffers = builder.personalizedOffers;
-
-    this.brand = builder.brand;
-
-    this.expiresAt = builder.expiresAt;
-  }
-
-  /** Parse JSON response into PersonalizedOfferPersonalizedOffersResponse object. */
-  public static PersonalizedOfferPersonalizedOffersResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into PersonalizedOfferPersonalizedOffersResponse object with HTTP response.
-   */
-  public static PersonalizedOfferPersonalizedOffersResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      builder.personalizedOffers(
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "personalized_offers")).stream()
-              .map(PersonalizedOffer::fromJson)
-              .collect(java.util.stream.Collectors.toList()));
-
-      String __brandJson = JsonUtil.getObject(json, "brand");
-      if (__brandJson != null) {
-        builder.brand(Brand.fromJson(__brandJson));
-      }
-
-      builder.expiresAt(JsonUtil.getTimestamp(json, "expires_at"));
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse PersonalizedOfferPersonalizedOffersResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for PersonalizedOfferPersonalizedOffersResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for PersonalizedOfferPersonalizedOffersResponse. */
-  public static class Builder {
-
-    private List<PersonalizedOffer> personalizedOffers;
-
-    private Brand brand;
-
-    private Timestamp expiresAt;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder personalizedOffers(List<PersonalizedOffer> personalizedOffers) {
-      this.personalizedOffers = personalizedOffers;
-      return this;
-    }
-
-    public Builder brand(Brand brand) {
-      this.brand = brand;
-      return this;
-    }
-
-    public Builder expiresAt(Timestamp expiresAt) {
-      this.expiresAt = expiresAt;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public PersonalizedOfferPersonalizedOffersResponse build() {
-      return new PersonalizedOfferPersonalizedOffersResponse(this);
-    }
-  }
-
-  /** Get the personalizedOffers from the response. */
-  public List<PersonalizedOffer> getPersonalizedOffers() {
-    return personalizedOffers;
-  }
-
-  /** Get the brand from the response. */
-  public Brand getBrand() {
-    return brand;
-  }
-
-  /** Get the expiresAt from the response. */
-  public Timestamp getExpiresAt() {
-    return expiresAt;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/plan/PlanRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/plan/PlanRetrieveResponse.java
deleted file mode 100644
index 3a488c92..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/plan/PlanRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.plan;
-
-import com.chargebee.v4.core.models.plan.Plan;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for PlanRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class PlanRetrieveResponse extends BaseResponse {
-  private final Plan plan;
-
-  private PlanRetrieveResponse(Plan plan, Response httpResponse) {
-    super(httpResponse);
-
-    this.plan = plan;
-  }
-
-  /** Parse JSON response into PlanRetrieveResponse object. */
-  public static PlanRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into PlanRetrieveResponse object with HTTP response. */
-  public static PlanRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Plan plan = Plan.fromJson(JsonUtil.getObject(json, "plan"));
-
-      return new PlanRetrieveResponse(plan, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse PlanRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the plan from the response. */
-  public Plan getPlan() {
-    return plan;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/portalSession/PortalSessionRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/portalSession/PortalSessionRetrieveResponse.java
deleted file mode 100644
index 4b07382b..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/portalSession/PortalSessionRetrieveResponse.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.chargebee.v4.core.responses.portalSession;
-
-import com.chargebee.v4.core.models.portalSession.PortalSession;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for PortalSessionRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class PortalSessionRetrieveResponse extends BaseResponse {
-  private final PortalSession portalSession;
-
-  private PortalSessionRetrieveResponse(PortalSession portalSession, Response httpResponse) {
-    super(httpResponse);
-
-    this.portalSession = portalSession;
-  }
-
-  /** Parse JSON response into PortalSessionRetrieveResponse object. */
-  public static PortalSessionRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into PortalSessionRetrieveResponse object with HTTP response. */
-  public static PortalSessionRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      PortalSession portalSession =
-          PortalSession.fromJson(JsonUtil.getObject(json, "portal_session"));
-
-      return new PortalSessionRetrieveResponse(portalSession, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse PortalSessionRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the portalSession from the response. */
-  public PortalSession getPortalSession() {
-    return portalSession;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantRetrieveResponse.java
deleted file mode 100644
index b871a080..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.priceVariant;
-
-import com.chargebee.v4.core.models.priceVariant.PriceVariant;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for PriceVariantRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class PriceVariantRetrieveResponse extends BaseResponse {
-  private final PriceVariant priceVariant;
-
-  private PriceVariantRetrieveResponse(PriceVariant priceVariant, Response httpResponse) {
-    super(httpResponse);
-
-    this.priceVariant = priceVariant;
-  }
-
-  /** Parse JSON response into PriceVariantRetrieveResponse object. */
-  public static PriceVariantRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into PriceVariantRetrieveResponse object with HTTP response. */
-  public static PriceVariantRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      PriceVariant priceVariant = PriceVariant.fromJson(JsonUtil.getObject(json, "price_variant"));
-
-      return new PriceVariantRetrieveResponse(priceVariant, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse PriceVariantRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the priceVariant from the response. */
-  public PriceVariant getPriceVariant() {
-    return priceVariant;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/product/ProductRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/product/ProductRetrieveResponse.java
deleted file mode 100644
index 6febce41..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/product/ProductRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.product;
-
-import com.chargebee.v4.core.models.product.Product;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ProductRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class ProductRetrieveResponse extends BaseResponse {
-  private final Product product;
-
-  private ProductRetrieveResponse(Product product, Response httpResponse) {
-    super(httpResponse);
-
-    this.product = product;
-  }
-
-  /** Parse JSON response into ProductRetrieveResponse object. */
-  public static ProductRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into ProductRetrieveResponse object with HTTP response. */
-  public static ProductRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Product product = Product.fromJson(JsonUtil.getObject(json, "product"));
-
-      return new ProductRetrieveResponse(product, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse ProductRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the product from the response. */
-  public Product getProduct() {
-    return product;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditRetrieveResponse.java
deleted file mode 100644
index ca4567ca..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditRetrieveResponse.java
+++ /dev/null
@@ -1,45 +0,0 @@
-package com.chargebee.v4.core.responses.promotionalCredit;
-
-import com.chargebee.v4.core.models.promotionalCredit.PromotionalCredit;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for PromotionalCreditRetrieve operation. Contains the response data
- * from a single resource get operation.
- */
-public final class PromotionalCreditRetrieveResponse extends BaseResponse {
-  private final PromotionalCredit promotionalCredit;
-
-  private PromotionalCreditRetrieveResponse(
-      PromotionalCredit promotionalCredit, Response httpResponse) {
-    super(httpResponse);
-
-    this.promotionalCredit = promotionalCredit;
-  }
-
-  /** Parse JSON response into PromotionalCreditRetrieveResponse object. */
-  public static PromotionalCreditRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into PromotionalCreditRetrieveResponse object with HTTP response. */
-  public static PromotionalCreditRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      PromotionalCredit promotionalCredit =
-          PromotionalCredit.fromJson(JsonUtil.getObject(json, "promotional_credit"));
-
-      return new PromotionalCreditRetrieveResponse(promotionalCredit, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse PromotionalCreditRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the promotionalCredit from the response. */
-  public PromotionalCredit getPromotionalCredit() {
-    return promotionalCredit;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteCreateSubForCustomerQuoteResponse.java b/src/main/java/com/chargebee/v4/core/responses/quote/QuoteCreateSubForCustomerQuoteResponse.java
deleted file mode 100644
index bc235d93..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteCreateSubForCustomerQuoteResponse.java
+++ /dev/null
@@ -1,102 +0,0 @@
-package com.chargebee.v4.core.responses.quote;
-
-import com.chargebee.v4.core.models.quote.Quote;
-
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for QuoteCreateSubForCustomerQuote operation. Contains the response
- * data from the API.
- */
-public final class QuoteCreateSubForCustomerQuoteResponse extends BaseResponse {
-  private final Quote quote;
-
-  private final QuotedSubscription quotedSubscription;
-
-  private QuoteCreateSubForCustomerQuoteResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.quote = builder.quote;
-
-    this.quotedSubscription = builder.quotedSubscription;
-  }
-
-  /** Parse JSON response into QuoteCreateSubForCustomerQuoteResponse object. */
-  public static QuoteCreateSubForCustomerQuoteResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into QuoteCreateSubForCustomerQuoteResponse object with HTTP response. */
-  public static QuoteCreateSubForCustomerQuoteResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __quoteJson = JsonUtil.getObject(json, "quote");
-      if (__quoteJson != null) {
-        builder.quote(Quote.fromJson(__quoteJson));
-      }
-
-      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
-      if (__quotedSubscriptionJson != null) {
-        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse QuoteCreateSubForCustomerQuoteResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for QuoteCreateSubForCustomerQuoteResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for QuoteCreateSubForCustomerQuoteResponse. */
-  public static class Builder {
-
-    private Quote quote;
-
-    private QuotedSubscription quotedSubscription;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder quote(Quote quote) {
-      this.quote = quote;
-      return this;
-    }
-
-    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
-      this.quotedSubscription = quotedSubscription;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public QuoteCreateSubForCustomerQuoteResponse build() {
-      return new QuoteCreateSubForCustomerQuoteResponse(this);
-    }
-  }
-
-  /** Get the quote from the response. */
-  public Quote getQuote() {
-    return quote;
-  }
-
-  /** Get the quotedSubscription from the response. */
-  public QuotedSubscription getQuotedSubscription() {
-    return quotedSubscription;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteCreateSubItemsForCustomerQuoteResponse.java b/src/main/java/com/chargebee/v4/core/responses/quote/QuoteCreateSubItemsForCustomerQuoteResponse.java
deleted file mode 100644
index 3e9ec42d..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteCreateSubItemsForCustomerQuoteResponse.java
+++ /dev/null
@@ -1,127 +0,0 @@
-package com.chargebee.v4.core.responses.quote;
-
-import com.chargebee.v4.core.models.quote.Quote;
-
-import com.chargebee.v4.core.models.quotedRamp.QuotedRamp;
-
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for QuoteCreateSubItemsForCustomerQuote operation. Contains the
- * response data from the API.
- */
-public final class QuoteCreateSubItemsForCustomerQuoteResponse extends BaseResponse {
-  private final Quote quote;
-
-  private final QuotedSubscription quotedSubscription;
-
-  private final QuotedRamp quotedRamp;
-
-  private QuoteCreateSubItemsForCustomerQuoteResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.quote = builder.quote;
-
-    this.quotedSubscription = builder.quotedSubscription;
-
-    this.quotedRamp = builder.quotedRamp;
-  }
-
-  /** Parse JSON response into QuoteCreateSubItemsForCustomerQuoteResponse object. */
-  public static QuoteCreateSubItemsForCustomerQuoteResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into QuoteCreateSubItemsForCustomerQuoteResponse object with HTTP response.
-   */
-  public static QuoteCreateSubItemsForCustomerQuoteResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __quoteJson = JsonUtil.getObject(json, "quote");
-      if (__quoteJson != null) {
-        builder.quote(Quote.fromJson(__quoteJson));
-      }
-
-      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
-      if (__quotedSubscriptionJson != null) {
-        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
-      }
-
-      String __quotedRampJson = JsonUtil.getObject(json, "quoted_ramp");
-      if (__quotedRampJson != null) {
-        builder.quotedRamp(QuotedRamp.fromJson(__quotedRampJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse QuoteCreateSubItemsForCustomerQuoteResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for QuoteCreateSubItemsForCustomerQuoteResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for QuoteCreateSubItemsForCustomerQuoteResponse. */
-  public static class Builder {
-
-    private Quote quote;
-
-    private QuotedSubscription quotedSubscription;
-
-    private QuotedRamp quotedRamp;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder quote(Quote quote) {
-      this.quote = quote;
-      return this;
-    }
-
-    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
-      this.quotedSubscription = quotedSubscription;
-      return this;
-    }
-
-    public Builder quotedRamp(QuotedRamp quotedRamp) {
-      this.quotedRamp = quotedRamp;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public QuoteCreateSubItemsForCustomerQuoteResponse build() {
-      return new QuoteCreateSubItemsForCustomerQuoteResponse(this);
-    }
-  }
-
-  /** Get the quote from the response. */
-  public Quote getQuote() {
-    return quote;
-  }
-
-  /** Get the quotedSubscription from the response. */
-  public QuotedSubscription getQuotedSubscription() {
-    return quotedSubscription;
-  }
-
-  /** Get the quotedRamp from the response. */
-  public QuotedRamp getQuotedRamp() {
-    return quotedRamp;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditCreateSubCustomerQuoteForItemsResponse.java b/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditCreateSubCustomerQuoteForItemsResponse.java
deleted file mode 100644
index 09d0e912..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditCreateSubCustomerQuoteForItemsResponse.java
+++ /dev/null
@@ -1,128 +0,0 @@
-package com.chargebee.v4.core.responses.quote;
-
-import com.chargebee.v4.core.models.quote.Quote;
-
-import com.chargebee.v4.core.models.quotedRamp.QuotedRamp;
-
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for QuoteEditCreateSubCustomerQuoteForItems operation. Contains the
- * response data from the API.
- */
-public final class QuoteEditCreateSubCustomerQuoteForItemsResponse extends BaseResponse {
-  private final Quote quote;
-
-  private final QuotedSubscription quotedSubscription;
-
-  private final QuotedRamp quotedRamp;
-
-  private QuoteEditCreateSubCustomerQuoteForItemsResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.quote = builder.quote;
-
-    this.quotedSubscription = builder.quotedSubscription;
-
-    this.quotedRamp = builder.quotedRamp;
-  }
-
-  /** Parse JSON response into QuoteEditCreateSubCustomerQuoteForItemsResponse object. */
-  public static QuoteEditCreateSubCustomerQuoteForItemsResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into QuoteEditCreateSubCustomerQuoteForItemsResponse object with HTTP
-   * response.
-   */
-  public static QuoteEditCreateSubCustomerQuoteForItemsResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __quoteJson = JsonUtil.getObject(json, "quote");
-      if (__quoteJson != null) {
-        builder.quote(Quote.fromJson(__quoteJson));
-      }
-
-      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
-      if (__quotedSubscriptionJson != null) {
-        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
-      }
-
-      String __quotedRampJson = JsonUtil.getObject(json, "quoted_ramp");
-      if (__quotedRampJson != null) {
-        builder.quotedRamp(QuotedRamp.fromJson(__quotedRampJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse QuoteEditCreateSubCustomerQuoteForItemsResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for QuoteEditCreateSubCustomerQuoteForItemsResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for QuoteEditCreateSubCustomerQuoteForItemsResponse. */
-  public static class Builder {
-
-    private Quote quote;
-
-    private QuotedSubscription quotedSubscription;
-
-    private QuotedRamp quotedRamp;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder quote(Quote quote) {
-      this.quote = quote;
-      return this;
-    }
-
-    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
-      this.quotedSubscription = quotedSubscription;
-      return this;
-    }
-
-    public Builder quotedRamp(QuotedRamp quotedRamp) {
-      this.quotedRamp = quotedRamp;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public QuoteEditCreateSubCustomerQuoteForItemsResponse build() {
-      return new QuoteEditCreateSubCustomerQuoteForItemsResponse(this);
-    }
-  }
-
-  /** Get the quote from the response. */
-  public Quote getQuote() {
-    return quote;
-  }
-
-  /** Get the quotedSubscription from the response. */
-  public QuotedSubscription getQuotedSubscription() {
-    return quotedSubscription;
-  }
-
-  /** Get the quotedRamp from the response. */
-  public QuotedRamp getQuotedRamp() {
-    return quotedRamp;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditCreateSubForCustomerQuoteResponse.java b/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditCreateSubForCustomerQuoteResponse.java
deleted file mode 100644
index f3f6851b..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditCreateSubForCustomerQuoteResponse.java
+++ /dev/null
@@ -1,104 +0,0 @@
-package com.chargebee.v4.core.responses.quote;
-
-import com.chargebee.v4.core.models.quote.Quote;
-
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for QuoteEditCreateSubForCustomerQuote operation. Contains the response
- * data from the API.
- */
-public final class QuoteEditCreateSubForCustomerQuoteResponse extends BaseResponse {
-  private final Quote quote;
-
-  private final QuotedSubscription quotedSubscription;
-
-  private QuoteEditCreateSubForCustomerQuoteResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.quote = builder.quote;
-
-    this.quotedSubscription = builder.quotedSubscription;
-  }
-
-  /** Parse JSON response into QuoteEditCreateSubForCustomerQuoteResponse object. */
-  public static QuoteEditCreateSubForCustomerQuoteResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into QuoteEditCreateSubForCustomerQuoteResponse object with HTTP response.
-   */
-  public static QuoteEditCreateSubForCustomerQuoteResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __quoteJson = JsonUtil.getObject(json, "quote");
-      if (__quoteJson != null) {
-        builder.quote(Quote.fromJson(__quoteJson));
-      }
-
-      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
-      if (__quotedSubscriptionJson != null) {
-        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse QuoteEditCreateSubForCustomerQuoteResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for QuoteEditCreateSubForCustomerQuoteResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for QuoteEditCreateSubForCustomerQuoteResponse. */
-  public static class Builder {
-
-    private Quote quote;
-
-    private QuotedSubscription quotedSubscription;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder quote(Quote quote) {
-      this.quote = quote;
-      return this;
-    }
-
-    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
-      this.quotedSubscription = quotedSubscription;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public QuoteEditCreateSubForCustomerQuoteResponse build() {
-      return new QuoteEditCreateSubForCustomerQuoteResponse(this);
-    }
-  }
-
-  /** Get the quote from the response. */
-  public Quote getQuote() {
-    return quote;
-  }
-
-  /** Get the quotedSubscription from the response. */
-  public QuotedSubscription getQuotedSubscription() {
-    return quotedSubscription;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditOneTimeQuoteResponse.java b/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditOneTimeQuoteResponse.java
deleted file mode 100644
index af3a3cfe..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditOneTimeQuoteResponse.java
+++ /dev/null
@@ -1,100 +0,0 @@
-package com.chargebee.v4.core.responses.quote;
-
-import com.chargebee.v4.core.models.quote.Quote;
-
-import com.chargebee.v4.core.models.quotedCharge.QuotedCharge;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for QuoteEditOneTimeQuote operation. Contains the response data from
- * the API.
- */
-public final class QuoteEditOneTimeQuoteResponse extends BaseResponse {
-  private final Quote quote;
-
-  private final QuotedCharge quotedCharge;
-
-  private QuoteEditOneTimeQuoteResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.quote = builder.quote;
-
-    this.quotedCharge = builder.quotedCharge;
-  }
-
-  /** Parse JSON response into QuoteEditOneTimeQuoteResponse object. */
-  public static QuoteEditOneTimeQuoteResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into QuoteEditOneTimeQuoteResponse object with HTTP response. */
-  public static QuoteEditOneTimeQuoteResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __quoteJson = JsonUtil.getObject(json, "quote");
-      if (__quoteJson != null) {
-        builder.quote(Quote.fromJson(__quoteJson));
-      }
-
-      String __quotedChargeJson = JsonUtil.getObject(json, "quoted_charge");
-      if (__quotedChargeJson != null) {
-        builder.quotedCharge(QuotedCharge.fromJson(__quotedChargeJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse QuoteEditOneTimeQuoteResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for QuoteEditOneTimeQuoteResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for QuoteEditOneTimeQuoteResponse. */
-  public static class Builder {
-
-    private Quote quote;
-
-    private QuotedCharge quotedCharge;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder quote(Quote quote) {
-      this.quote = quote;
-      return this;
-    }
-
-    public Builder quotedCharge(QuotedCharge quotedCharge) {
-      this.quotedCharge = quotedCharge;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public QuoteEditOneTimeQuoteResponse build() {
-      return new QuoteEditOneTimeQuoteResponse(this);
-    }
-  }
-
-  /** Get the quote from the response. */
-  public Quote getQuote() {
-    return quote;
-  }
-
-  /** Get the quotedCharge from the response. */
-  public QuotedCharge getQuotedCharge() {
-    return quotedCharge;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditUpdateSubscriptionQuoteForItemsResponse.java b/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditUpdateSubscriptionQuoteForItemsResponse.java
deleted file mode 100644
index 0003ce08..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditUpdateSubscriptionQuoteForItemsResponse.java
+++ /dev/null
@@ -1,128 +0,0 @@
-package com.chargebee.v4.core.responses.quote;
-
-import com.chargebee.v4.core.models.quote.Quote;
-
-import com.chargebee.v4.core.models.quotedRamp.QuotedRamp;
-
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for QuoteEditUpdateSubscriptionQuoteForItems operation. Contains the
- * response data from the API.
- */
-public final class QuoteEditUpdateSubscriptionQuoteForItemsResponse extends BaseResponse {
-  private final Quote quote;
-
-  private final QuotedSubscription quotedSubscription;
-
-  private final QuotedRamp quotedRamp;
-
-  private QuoteEditUpdateSubscriptionQuoteForItemsResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.quote = builder.quote;
-
-    this.quotedSubscription = builder.quotedSubscription;
-
-    this.quotedRamp = builder.quotedRamp;
-  }
-
-  /** Parse JSON response into QuoteEditUpdateSubscriptionQuoteForItemsResponse object. */
-  public static QuoteEditUpdateSubscriptionQuoteForItemsResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into QuoteEditUpdateSubscriptionQuoteForItemsResponse object with HTTP
-   * response.
-   */
-  public static QuoteEditUpdateSubscriptionQuoteForItemsResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __quoteJson = JsonUtil.getObject(json, "quote");
-      if (__quoteJson != null) {
-        builder.quote(Quote.fromJson(__quoteJson));
-      }
-
-      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
-      if (__quotedSubscriptionJson != null) {
-        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
-      }
-
-      String __quotedRampJson = JsonUtil.getObject(json, "quoted_ramp");
-      if (__quotedRampJson != null) {
-        builder.quotedRamp(QuotedRamp.fromJson(__quotedRampJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse QuoteEditUpdateSubscriptionQuoteForItemsResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for QuoteEditUpdateSubscriptionQuoteForItemsResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for QuoteEditUpdateSubscriptionQuoteForItemsResponse. */
-  public static class Builder {
-
-    private Quote quote;
-
-    private QuotedSubscription quotedSubscription;
-
-    private QuotedRamp quotedRamp;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder quote(Quote quote) {
-      this.quote = quote;
-      return this;
-    }
-
-    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
-      this.quotedSubscription = quotedSubscription;
-      return this;
-    }
-
-    public Builder quotedRamp(QuotedRamp quotedRamp) {
-      this.quotedRamp = quotedRamp;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteForItemsResponse build() {
-      return new QuoteEditUpdateSubscriptionQuoteForItemsResponse(this);
-    }
-  }
-
-  /** Get the quote from the response. */
-  public Quote getQuote() {
-    return quote;
-  }
-
-  /** Get the quotedSubscription from the response. */
-  public QuotedSubscription getQuotedSubscription() {
-    return quotedSubscription;
-  }
-
-  /** Get the quotedRamp from the response. */
-  public QuotedRamp getQuotedRamp() {
-    return quotedRamp;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditUpdateSubscriptionQuoteResponse.java b/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditUpdateSubscriptionQuoteResponse.java
deleted file mode 100644
index fd13b17f..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditUpdateSubscriptionQuoteResponse.java
+++ /dev/null
@@ -1,104 +0,0 @@
-package com.chargebee.v4.core.responses.quote;
-
-import com.chargebee.v4.core.models.quote.Quote;
-
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for QuoteEditUpdateSubscriptionQuote operation. Contains the response
- * data from the API.
- */
-public final class QuoteEditUpdateSubscriptionQuoteResponse extends BaseResponse {
-  private final Quote quote;
-
-  private final QuotedSubscription quotedSubscription;
-
-  private QuoteEditUpdateSubscriptionQuoteResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.quote = builder.quote;
-
-    this.quotedSubscription = builder.quotedSubscription;
-  }
-
-  /** Parse JSON response into QuoteEditUpdateSubscriptionQuoteResponse object. */
-  public static QuoteEditUpdateSubscriptionQuoteResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into QuoteEditUpdateSubscriptionQuoteResponse object with HTTP response.
-   */
-  public static QuoteEditUpdateSubscriptionQuoteResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __quoteJson = JsonUtil.getObject(json, "quote");
-      if (__quoteJson != null) {
-        builder.quote(Quote.fromJson(__quoteJson));
-      }
-
-      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
-      if (__quotedSubscriptionJson != null) {
-        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse QuoteEditUpdateSubscriptionQuoteResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for QuoteEditUpdateSubscriptionQuoteResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for QuoteEditUpdateSubscriptionQuoteResponse. */
-  public static class Builder {
-
-    private Quote quote;
-
-    private QuotedSubscription quotedSubscription;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder quote(Quote quote) {
-      this.quote = quote;
-      return this;
-    }
-
-    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
-      this.quotedSubscription = quotedSubscription;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public QuoteEditUpdateSubscriptionQuoteResponse build() {
-      return new QuoteEditUpdateSubscriptionQuoteResponse(this);
-    }
-  }
-
-  /** Get the quote from the response. */
-  public Quote getQuote() {
-    return quote;
-  }
-
-  /** Get the quotedSubscription from the response. */
-  public QuotedSubscription getQuotedSubscription() {
-    return quotedSubscription;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteQuoteLineGroupsForQuoteResponse.java b/src/main/java/com/chargebee/v4/core/responses/quote/QuoteQuoteLineGroupsForQuoteResponse.java
deleted file mode 100644
index ba1d7725..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteQuoteLineGroupsForQuoteResponse.java
+++ /dev/null
@@ -1,178 +0,0 @@
-package com.chargebee.v4.core.responses.quote;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.quoteLineGroup.QuoteLineGroup;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.QuoteService;
-import com.chargebee.v4.core.models.quote.params.QuoteQuoteLineGroupsForQuoteParams;
-
-/**
- * Immutable response object for QuoteQuoteLineGroupsForQuote operation. Contains paginated list
- * data.
- */
-public final class QuoteQuoteLineGroupsForQuoteResponse {
-
-  private final List<QuoteQuoteLineGroupsForQuoteItem> list;
-
-  private final String nextOffset;
-
-  private final String quoteId;
-
-  private final QuoteService service;
-  private final QuoteQuoteLineGroupsForQuoteParams originalParams;
-  private final Response httpResponse;
-
-  private QuoteQuoteLineGroupsForQuoteResponse(
-      List<QuoteQuoteLineGroupsForQuoteItem> list,
-      String nextOffset,
-      String quoteId,
-      QuoteService service,
-      QuoteQuoteLineGroupsForQuoteParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.quoteId = quoteId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into QuoteQuoteLineGroupsForQuoteResponse object (no service context). Use
-   * this when you only need to read a single page (no nextPage()).
-   */
-  public static QuoteQuoteLineGroupsForQuoteResponse fromJson(String json) {
-    try {
-
-      List<QuoteQuoteLineGroupsForQuoteItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(QuoteQuoteLineGroupsForQuoteItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new QuoteQuoteLineGroupsForQuoteResponse(list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse QuoteQuoteLineGroupsForQuoteResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into QuoteQuoteLineGroupsForQuoteResponse object with service context for
-   * pagination (enables nextPage()).
-   */
-  public static QuoteQuoteLineGroupsForQuoteResponse fromJson(
-      String json,
-      QuoteService service,
-      QuoteQuoteLineGroupsForQuoteParams originalParams,
-      String quoteId,
-      Response httpResponse) {
-    try {
-
-      List<QuoteQuoteLineGroupsForQuoteItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(QuoteQuoteLineGroupsForQuoteItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new QuoteQuoteLineGroupsForQuoteResponse(
-          list, nextOffset, quoteId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse QuoteQuoteLineGroupsForQuoteResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<QuoteQuoteLineGroupsForQuoteItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public QuoteQuoteLineGroupsForQuoteResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    QuoteQuoteLineGroupsForQuoteParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : QuoteQuoteLineGroupsForQuoteParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.quoteLineGroupsForQuote(quoteId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class QuoteQuoteLineGroupsForQuoteItem {
-
-    private QuoteLineGroup quoteLineGroup;
-
-    public QuoteLineGroup getQuoteLineGroup() {
-      return quoteLineGroup;
-    }
-
-    public static QuoteQuoteLineGroupsForQuoteItem fromJson(String json) {
-      QuoteQuoteLineGroupsForQuoteItem item = new QuoteQuoteLineGroupsForQuoteItem();
-
-      String __quoteLineGroupJson = JsonUtil.getObject(json, "quote_line_group");
-      if (__quoteLineGroupJson != null) {
-        item.quoteLineGroup = QuoteLineGroup.fromJson(__quoteLineGroupJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/quote/QuoteRetrieveResponse.java
deleted file mode 100644
index 6dae5314..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteRetrieveResponse.java
+++ /dev/null
@@ -1,89 +0,0 @@
-package com.chargebee.v4.core.responses.quote;
-
-import com.chargebee.v4.core.models.quote.Quote;
-
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
-
-import com.chargebee.v4.core.models.quotedCharge.QuotedCharge;
-
-import com.chargebee.v4.core.models.quotedRamp.QuotedRamp;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for QuoteRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class QuoteRetrieveResponse extends BaseResponse {
-  private final Quote quote;
-
-  private final QuotedSubscription quotedSubscription;
-
-  private final QuotedCharge quotedCharge;
-
-  private final QuotedRamp quotedRamp;
-
-  private QuoteRetrieveResponse(
-      Quote quote,
-      QuotedSubscription quotedSubscription,
-      QuotedCharge quotedCharge,
-      QuotedRamp quotedRamp,
-      Response httpResponse) {
-    super(httpResponse);
-
-    this.quote = quote;
-
-    this.quotedSubscription = quotedSubscription;
-
-    this.quotedCharge = quotedCharge;
-
-    this.quotedRamp = quotedRamp;
-  }
-
-  /** Parse JSON response into QuoteRetrieveResponse object. */
-  public static QuoteRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into QuoteRetrieveResponse object with HTTP response. */
-  public static QuoteRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Quote quote = Quote.fromJson(JsonUtil.getObject(json, "quote"));
-
-      QuotedSubscription quotedSubscription =
-          QuotedSubscription.fromJson(JsonUtil.getObject(json, "quoted_subscription"));
-
-      QuotedCharge quotedCharge = QuotedCharge.fromJson(JsonUtil.getObject(json, "quoted_charge"));
-
-      QuotedRamp quotedRamp = QuotedRamp.fromJson(JsonUtil.getObject(json, "quoted_ramp"));
-
-      return new QuoteRetrieveResponse(
-          quote, quotedSubscription, quotedCharge, quotedRamp, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse QuoteRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the quote from the response. */
-  public Quote getQuote() {
-    return quote;
-  }
-
-  /** Get the quotedSubscription from the response. */
-  public QuotedSubscription getQuotedSubscription() {
-    return quotedSubscription;
-  }
-
-  /** Get the quotedCharge from the response. */
-  public QuotedCharge getQuotedCharge() {
-    return quotedCharge;
-  }
-
-  /** Get the quotedRamp from the response. */
-  public QuotedRamp getQuotedRamp() {
-    return quotedRamp;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteUpdateSubscriptionQuoteForItemsResponse.java b/src/main/java/com/chargebee/v4/core/responses/quote/QuoteUpdateSubscriptionQuoteForItemsResponse.java
deleted file mode 100644
index b5766c29..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteUpdateSubscriptionQuoteForItemsResponse.java
+++ /dev/null
@@ -1,128 +0,0 @@
-package com.chargebee.v4.core.responses.quote;
-
-import com.chargebee.v4.core.models.quote.Quote;
-
-import com.chargebee.v4.core.models.quotedRamp.QuotedRamp;
-
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for QuoteUpdateSubscriptionQuoteForItems operation. Contains the
- * response data from the API.
- */
-public final class QuoteUpdateSubscriptionQuoteForItemsResponse extends BaseResponse {
-  private final Quote quote;
-
-  private final QuotedSubscription quotedSubscription;
-
-  private final QuotedRamp quotedRamp;
-
-  private QuoteUpdateSubscriptionQuoteForItemsResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.quote = builder.quote;
-
-    this.quotedSubscription = builder.quotedSubscription;
-
-    this.quotedRamp = builder.quotedRamp;
-  }
-
-  /** Parse JSON response into QuoteUpdateSubscriptionQuoteForItemsResponse object. */
-  public static QuoteUpdateSubscriptionQuoteForItemsResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into QuoteUpdateSubscriptionQuoteForItemsResponse object with HTTP
-   * response.
-   */
-  public static QuoteUpdateSubscriptionQuoteForItemsResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __quoteJson = JsonUtil.getObject(json, "quote");
-      if (__quoteJson != null) {
-        builder.quote(Quote.fromJson(__quoteJson));
-      }
-
-      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
-      if (__quotedSubscriptionJson != null) {
-        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
-      }
-
-      String __quotedRampJson = JsonUtil.getObject(json, "quoted_ramp");
-      if (__quotedRampJson != null) {
-        builder.quotedRamp(QuotedRamp.fromJson(__quotedRampJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse QuoteUpdateSubscriptionQuoteForItemsResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for QuoteUpdateSubscriptionQuoteForItemsResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for QuoteUpdateSubscriptionQuoteForItemsResponse. */
-  public static class Builder {
-
-    private Quote quote;
-
-    private QuotedSubscription quotedSubscription;
-
-    private QuotedRamp quotedRamp;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder quote(Quote quote) {
-      this.quote = quote;
-      return this;
-    }
-
-    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
-      this.quotedSubscription = quotedSubscription;
-      return this;
-    }
-
-    public Builder quotedRamp(QuotedRamp quotedRamp) {
-      this.quotedRamp = quotedRamp;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteForItemsResponse build() {
-      return new QuoteUpdateSubscriptionQuoteForItemsResponse(this);
-    }
-  }
-
-  /** Get the quote from the response. */
-  public Quote getQuote() {
-    return quote;
-  }
-
-  /** Get the quotedSubscription from the response. */
-  public QuotedSubscription getQuotedSubscription() {
-    return quotedSubscription;
-  }
-
-  /** Get the quotedRamp from the response. */
-  public QuotedRamp getQuotedRamp() {
-    return quotedRamp;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteUpdateSubscriptionQuoteResponse.java b/src/main/java/com/chargebee/v4/core/responses/quote/QuoteUpdateSubscriptionQuoteResponse.java
deleted file mode 100644
index 88526bfc..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteUpdateSubscriptionQuoteResponse.java
+++ /dev/null
@@ -1,101 +0,0 @@
-package com.chargebee.v4.core.responses.quote;
-
-import com.chargebee.v4.core.models.quote.Quote;
-
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for QuoteUpdateSubscriptionQuote operation. Contains the response data
- * from the API.
- */
-public final class QuoteUpdateSubscriptionQuoteResponse extends BaseResponse {
-  private final Quote quote;
-
-  private final QuotedSubscription quotedSubscription;
-
-  private QuoteUpdateSubscriptionQuoteResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.quote = builder.quote;
-
-    this.quotedSubscription = builder.quotedSubscription;
-  }
-
-  /** Parse JSON response into QuoteUpdateSubscriptionQuoteResponse object. */
-  public static QuoteUpdateSubscriptionQuoteResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into QuoteUpdateSubscriptionQuoteResponse object with HTTP response. */
-  public static QuoteUpdateSubscriptionQuoteResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __quoteJson = JsonUtil.getObject(json, "quote");
-      if (__quoteJson != null) {
-        builder.quote(Quote.fromJson(__quoteJson));
-      }
-
-      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
-      if (__quotedSubscriptionJson != null) {
-        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse QuoteUpdateSubscriptionQuoteResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for QuoteUpdateSubscriptionQuoteResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for QuoteUpdateSubscriptionQuoteResponse. */
-  public static class Builder {
-
-    private Quote quote;
-
-    private QuotedSubscription quotedSubscription;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder quote(Quote quote) {
-      this.quote = quote;
-      return this;
-    }
-
-    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
-      this.quotedSubscription = quotedSubscription;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public QuoteUpdateSubscriptionQuoteResponse build() {
-      return new QuoteUpdateSubscriptionQuoteResponse(this);
-    }
-  }
-
-  /** Get the quote from the response. */
-  public Quote getQuote() {
-    return quote;
-  }
-
-  /** Get the quotedSubscription from the response. */
-  public QuotedSubscription getQuotedSubscription() {
-    return quotedSubscription;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/ramp/RampRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/ramp/RampRetrieveResponse.java
deleted file mode 100644
index 4caa84e1..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/ramp/RampRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.ramp;
-
-import com.chargebee.v4.core.models.ramp.Ramp;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for RampRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class RampRetrieveResponse extends BaseResponse {
-  private final Ramp ramp;
-
-  private RampRetrieveResponse(Ramp ramp, Response httpResponse) {
-    super(httpResponse);
-
-    this.ramp = ramp;
-  }
-
-  /** Parse JSON response into RampRetrieveResponse object. */
-  public static RampRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into RampRetrieveResponse object with HTTP response. */
-  public static RampRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Ramp ramp = Ramp.fromJson(JsonUtil.getObject(json, "ramp"));
-
-      return new RampRetrieveResponse(ramp, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse RampRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the ramp from the response. */
-  public Ramp getRamp() {
-    return ramp;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/recordedPurchase/RecordedPurchaseRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/recordedPurchase/RecordedPurchaseRetrieveResponse.java
deleted file mode 100644
index 053ddee4..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/recordedPurchase/RecordedPurchaseRetrieveResponse.java
+++ /dev/null
@@ -1,45 +0,0 @@
-package com.chargebee.v4.core.responses.recordedPurchase;
-
-import com.chargebee.v4.core.models.recordedPurchase.RecordedPurchase;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for RecordedPurchaseRetrieve operation. Contains the response data from
- * a single resource get operation.
- */
-public final class RecordedPurchaseRetrieveResponse extends BaseResponse {
-  private final RecordedPurchase recordedPurchase;
-
-  private RecordedPurchaseRetrieveResponse(
-      RecordedPurchase recordedPurchase, Response httpResponse) {
-    super(httpResponse);
-
-    this.recordedPurchase = recordedPurchase;
-  }
-
-  /** Parse JSON response into RecordedPurchaseRetrieveResponse object. */
-  public static RecordedPurchaseRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into RecordedPurchaseRetrieveResponse object with HTTP response. */
-  public static RecordedPurchaseRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      RecordedPurchase recordedPurchase =
-          RecordedPurchase.fromJson(JsonUtil.getObject(json, "recorded_purchase"));
-
-      return new RecordedPurchaseRetrieveResponse(recordedPurchase, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse RecordedPurchaseRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the recordedPurchase from the response. */
-  public RecordedPurchase getRecordedPurchase() {
-    return recordedPurchase;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/resourceMigration/ResourceMigrationRetrieveLatestResponse.java b/src/main/java/com/chargebee/v4/core/responses/resourceMigration/ResourceMigrationRetrieveLatestResponse.java
deleted file mode 100644
index d043e11f..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/resourceMigration/ResourceMigrationRetrieveLatestResponse.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.chargebee.v4.core.responses.resourceMigration;
-
-import com.chargebee.v4.core.models.resourceMigration.ResourceMigration;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ResourceMigrationRetrieveLatest operation. Contains the response
- * data from a single resource get operation.
- */
-public final class ResourceMigrationRetrieveLatestResponse extends BaseResponse {
-  private final ResourceMigration resourceMigration;
-
-  private ResourceMigrationRetrieveLatestResponse(
-      ResourceMigration resourceMigration, Response httpResponse) {
-    super(httpResponse);
-
-    this.resourceMigration = resourceMigration;
-  }
-
-  /** Parse JSON response into ResourceMigrationRetrieveLatestResponse object. */
-  public static ResourceMigrationRetrieveLatestResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into ResourceMigrationRetrieveLatestResponse object with HTTP response. */
-  public static ResourceMigrationRetrieveLatestResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      ResourceMigration resourceMigration =
-          ResourceMigration.fromJson(JsonUtil.getObject(json, "resource_migration"));
-
-      return new ResourceMigrationRetrieveLatestResponse(resourceMigration, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ResourceMigrationRetrieveLatestResponse from JSON", e);
-    }
-  }
-
-  /** Get the resourceMigration from the response. */
-  public ResourceMigration getResourceMigration() {
-    return resourceMigration;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/rule/RuleRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/rule/RuleRetrieveResponse.java
deleted file mode 100644
index 36eb31d2..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/rule/RuleRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.rule;
-
-import com.chargebee.v4.core.models.rule.Rule;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for RuleRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class RuleRetrieveResponse extends BaseResponse {
-  private final Rule rule;
-
-  private RuleRetrieveResponse(Rule rule, Response httpResponse) {
-    super(httpResponse);
-
-    this.rule = rule;
-  }
-
-  /** Parse JSON response into RuleRetrieveResponse object. */
-  public static RuleRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into RuleRetrieveResponse object with HTTP response. */
-  public static RuleRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Rule rule = Rule.fromJson(JsonUtil.getObject(json, "rule"));
-
-      return new RuleRetrieveResponse(rule, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse RuleRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the rule from the response. */
-  public Rule getRule() {
-    return rule;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionContractTermsForSubscriptionResponse.java b/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionContractTermsForSubscriptionResponse.java
deleted file mode 100644
index 0ab502f6..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionContractTermsForSubscriptionResponse.java
+++ /dev/null
@@ -1,180 +0,0 @@
-package com.chargebee.v4.core.responses.subscription;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.contractTerm.ContractTerm;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.SubscriptionService;
-import com.chargebee.v4.core.models.subscription.params.SubscriptionContractTermsForSubscriptionParams;
-
-/**
- * Immutable response object for SubscriptionContractTermsForSubscription operation. Contains
- * paginated list data.
- */
-public final class SubscriptionContractTermsForSubscriptionResponse {
-
-  private final List<SubscriptionContractTermsForSubscriptionItem> list;
-
-  private final String nextOffset;
-
-  private final String subscriptionId;
-
-  private final SubscriptionService service;
-  private final SubscriptionContractTermsForSubscriptionParams originalParams;
-  private final Response httpResponse;
-
-  private SubscriptionContractTermsForSubscriptionResponse(
-      List<SubscriptionContractTermsForSubscriptionItem> list,
-      String nextOffset,
-      String subscriptionId,
-      SubscriptionService service,
-      SubscriptionContractTermsForSubscriptionParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.subscriptionId = subscriptionId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into SubscriptionContractTermsForSubscriptionResponse object (no service
-   * context). Use this when you only need to read a single page (no nextPage()).
-   */
-  public static SubscriptionContractTermsForSubscriptionResponse fromJson(String json) {
-    try {
-
-      List<SubscriptionContractTermsForSubscriptionItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(SubscriptionContractTermsForSubscriptionItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new SubscriptionContractTermsForSubscriptionResponse(
-          list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse SubscriptionContractTermsForSubscriptionResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into SubscriptionContractTermsForSubscriptionResponse object with service
-   * context for pagination (enables nextPage()).
-   */
-  public static SubscriptionContractTermsForSubscriptionResponse fromJson(
-      String json,
-      SubscriptionService service,
-      SubscriptionContractTermsForSubscriptionParams originalParams,
-      String subscriptionId,
-      Response httpResponse) {
-    try {
-
-      List<SubscriptionContractTermsForSubscriptionItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(SubscriptionContractTermsForSubscriptionItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new SubscriptionContractTermsForSubscriptionResponse(
-          list, nextOffset, subscriptionId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse SubscriptionContractTermsForSubscriptionResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<SubscriptionContractTermsForSubscriptionItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public SubscriptionContractTermsForSubscriptionResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    SubscriptionContractTermsForSubscriptionParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : SubscriptionContractTermsForSubscriptionParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.contractTermsForSubscription(subscriptionId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class SubscriptionContractTermsForSubscriptionItem {
-
-    private ContractTerm contractTerm;
-
-    public ContractTerm getContractTerm() {
-      return contractTerm;
-    }
-
-    public static SubscriptionContractTermsForSubscriptionItem fromJson(String json) {
-      SubscriptionContractTermsForSubscriptionItem item =
-          new SubscriptionContractTermsForSubscriptionItem();
-
-      String __contractTermJson = JsonUtil.getObject(json, "contract_term");
-      if (__contractTermJson != null) {
-        item.contractTerm = ContractTerm.fromJson(__contractTermJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportSubscriptionResponse.java b/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportSubscriptionResponse.java
deleted file mode 100644
index 2cb9b4fc..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportSubscriptionResponse.java
+++ /dev/null
@@ -1,148 +0,0 @@
-package com.chargebee.v4.core.responses.subscription;
-
-import com.chargebee.v4.core.models.invoice.Invoice;
-
-import com.chargebee.v4.core.models.customer.Customer;
-
-import com.chargebee.v4.core.models.subscription.Subscription;
-
-import com.chargebee.v4.core.models.card.Card;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for SubscriptionImportSubscription operation. Contains the response
- * data from the API.
- */
-public final class SubscriptionImportSubscriptionResponse extends BaseResponse {
-  private final Subscription subscription;
-
-  private final Customer customer;
-
-  private final Card card;
-
-  private final Invoice invoice;
-
-  private SubscriptionImportSubscriptionResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.subscription = builder.subscription;
-
-    this.customer = builder.customer;
-
-    this.card = builder.card;
-
-    this.invoice = builder.invoice;
-  }
-
-  /** Parse JSON response into SubscriptionImportSubscriptionResponse object. */
-  public static SubscriptionImportSubscriptionResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into SubscriptionImportSubscriptionResponse object with HTTP response. */
-  public static SubscriptionImportSubscriptionResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __subscriptionJson = JsonUtil.getObject(json, "subscription");
-      if (__subscriptionJson != null) {
-        builder.subscription(Subscription.fromJson(__subscriptionJson));
-      }
-
-      String __customerJson = JsonUtil.getObject(json, "customer");
-      if (__customerJson != null) {
-        builder.customer(Customer.fromJson(__customerJson));
-      }
-
-      String __cardJson = JsonUtil.getObject(json, "card");
-      if (__cardJson != null) {
-        builder.card(Card.fromJson(__cardJson));
-      }
-
-      String __invoiceJson = JsonUtil.getObject(json, "invoice");
-      if (__invoiceJson != null) {
-        builder.invoice(Invoice.fromJson(__invoiceJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse SubscriptionImportSubscriptionResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for SubscriptionImportSubscriptionResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for SubscriptionImportSubscriptionResponse. */
-  public static class Builder {
-
-    private Subscription subscription;
-
-    private Customer customer;
-
-    private Card card;
-
-    private Invoice invoice;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder subscription(Subscription subscription) {
-      this.subscription = subscription;
-      return this;
-    }
-
-    public Builder customer(Customer customer) {
-      this.customer = customer;
-      return this;
-    }
-
-    public Builder card(Card card) {
-      this.card = card;
-      return this;
-    }
-
-    public Builder invoice(Invoice invoice) {
-      this.invoice = invoice;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public SubscriptionImportSubscriptionResponse build() {
-      return new SubscriptionImportSubscriptionResponse(this);
-    }
-  }
-
-  /** Get the subscription from the response. */
-  public Subscription getSubscription() {
-    return subscription;
-  }
-
-  /** Get the customer from the response. */
-  public Customer getCustomer() {
-    return customer;
-  }
-
-  /** Get the card from the response. */
-  public Card getCard() {
-    return card;
-  }
-
-  /** Get the invoice from the response. */
-  public Invoice getInvoice() {
-    return invoice;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRetrieveAdvanceInvoiceScheduleResponse.java b/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRetrieveAdvanceInvoiceScheduleResponse.java
deleted file mode 100644
index b8f5ac59..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRetrieveAdvanceInvoiceScheduleResponse.java
+++ /dev/null
@@ -1,54 +0,0 @@
-package com.chargebee.v4.core.responses.subscription;
-
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import java.util.List;
-
-/**
- * Immutable response object for SubscriptionRetrieveAdvanceInvoiceSchedule operation. Contains the
- * response data from a single resource get operation.
- */
-public final class SubscriptionRetrieveAdvanceInvoiceScheduleResponse extends BaseResponse {
-  private final List<AdvanceInvoiceSchedule> advanceInvoiceSchedules;
-
-  private SubscriptionRetrieveAdvanceInvoiceScheduleResponse(
-      List<AdvanceInvoiceSchedule> advanceInvoiceSchedules, Response httpResponse) {
-    super(httpResponse);
-
-    this.advanceInvoiceSchedules = advanceInvoiceSchedules;
-  }
-
-  /** Parse JSON response into SubscriptionRetrieveAdvanceInvoiceScheduleResponse object. */
-  public static SubscriptionRetrieveAdvanceInvoiceScheduleResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into SubscriptionRetrieveAdvanceInvoiceScheduleResponse object with HTTP
-   * response.
-   */
-  public static SubscriptionRetrieveAdvanceInvoiceScheduleResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      List<AdvanceInvoiceSchedule> advanceInvoiceSchedules =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "advance_invoice_schedules")).stream()
-              .map(AdvanceInvoiceSchedule::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      return new SubscriptionRetrieveAdvanceInvoiceScheduleResponse(
-          advanceInvoiceSchedules, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse SubscriptionRetrieveAdvanceInvoiceScheduleResponse from JSON", e);
-    }
-  }
-
-  /** Get the advanceInvoiceSchedules from the response. */
-  public List<AdvanceInvoiceSchedule> getAdvanceInvoiceSchedules() {
-    return advanceInvoiceSchedules;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRetrieveResponse.java
deleted file mode 100644
index fbdeb729..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRetrieveResponse.java
+++ /dev/null
@@ -1,70 +0,0 @@
-package com.chargebee.v4.core.responses.subscription;
-
-import com.chargebee.v4.core.models.subscription.Subscription;
-
-import com.chargebee.v4.core.models.customer.Customer;
-
-import com.chargebee.v4.core.models.card.Card;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for SubscriptionRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class SubscriptionRetrieveResponse extends BaseResponse {
-  private final Subscription subscription;
-
-  private final Customer customer;
-
-  private final Card card;
-
-  private SubscriptionRetrieveResponse(
-      Subscription subscription, Customer customer, Card card, Response httpResponse) {
-    super(httpResponse);
-
-    this.subscription = subscription;
-
-    this.customer = customer;
-
-    this.card = card;
-  }
-
-  /** Parse JSON response into SubscriptionRetrieveResponse object. */
-  public static SubscriptionRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into SubscriptionRetrieveResponse object with HTTP response. */
-  public static SubscriptionRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Subscription subscription = Subscription.fromJson(JsonUtil.getObject(json, "subscription"));
-
-      Customer customer = Customer.fromJson(JsonUtil.getObject(json, "customer"));
-
-      Card card = Card.fromJson(JsonUtil.getObject(json, "card"));
-
-      return new SubscriptionRetrieveResponse(subscription, customer, card, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse SubscriptionRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the subscription from the response. */
-  public Subscription getSubscription() {
-    return subscription;
-  }
-
-  /** Get the customer from the response. */
-  public Customer getCustomer() {
-    return customer;
-  }
-
-  /** Get the card from the response. */
-  public Card getCard() {
-    return card;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRetrieveWithScheduledChangesResponse.java b/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRetrieveWithScheduledChangesResponse.java
deleted file mode 100644
index 0f783a21..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRetrieveWithScheduledChangesResponse.java
+++ /dev/null
@@ -1,76 +0,0 @@
-package com.chargebee.v4.core.responses.subscription;
-
-import com.chargebee.v4.core.models.subscription.Subscription;
-
-import com.chargebee.v4.core.models.customer.Customer;
-
-import com.chargebee.v4.core.models.card.Card;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for SubscriptionRetrieveWithScheduledChanges operation. Contains the
- * response data from a single resource get operation.
- */
-public final class SubscriptionRetrieveWithScheduledChangesResponse extends BaseResponse {
-  private final Subscription subscription;
-
-  private final Customer customer;
-
-  private final Card card;
-
-  private SubscriptionRetrieveWithScheduledChangesResponse(
-      Subscription subscription, Customer customer, Card card, Response httpResponse) {
-    super(httpResponse);
-
-    this.subscription = subscription;
-
-    this.customer = customer;
-
-    this.card = card;
-  }
-
-  /** Parse JSON response into SubscriptionRetrieveWithScheduledChangesResponse object. */
-  public static SubscriptionRetrieveWithScheduledChangesResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into SubscriptionRetrieveWithScheduledChangesResponse object with HTTP
-   * response.
-   */
-  public static SubscriptionRetrieveWithScheduledChangesResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      Subscription subscription = Subscription.fromJson(JsonUtil.getObject(json, "subscription"));
-
-      Customer customer = Customer.fromJson(JsonUtil.getObject(json, "customer"));
-
-      Card card = Card.fromJson(JsonUtil.getObject(json, "card"));
-
-      return new SubscriptionRetrieveWithScheduledChangesResponse(
-          subscription, customer, card, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse SubscriptionRetrieveWithScheduledChangesResponse from JSON", e);
-    }
-  }
-
-  /** Get the subscription from the response. */
-  public Subscription getSubscription() {
-    return subscription;
-  }
-
-  /** Get the customer from the response. */
-  public Customer getCustomer() {
-    return customer;
-  }
-
-  /** Get the card from the response. */
-  public Card getCard() {
-    return card;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionSubscriptionsForCustomerResponse.java b/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionSubscriptionsForCustomerResponse.java
deleted file mode 100644
index 297f3b90..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionSubscriptionsForCustomerResponse.java
+++ /dev/null
@@ -1,180 +0,0 @@
-package com.chargebee.v4.core.responses.subscription;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.subscription.Subscription;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.SubscriptionService;
-import com.chargebee.v4.core.models.subscription.params.SubscriptionSubscriptionsForCustomerParams;
-
-/**
- * Immutable response object for SubscriptionSubscriptionsForCustomer operation. Contains paginated
- * list data.
- */
-public final class SubscriptionSubscriptionsForCustomerResponse {
-
-  private final List<SubscriptionSubscriptionsForCustomerItem> list;
-
-  private final String nextOffset;
-
-  private final String customerId;
-
-  private final SubscriptionService service;
-  private final SubscriptionSubscriptionsForCustomerParams originalParams;
-  private final Response httpResponse;
-
-  private SubscriptionSubscriptionsForCustomerResponse(
-      List<SubscriptionSubscriptionsForCustomerItem> list,
-      String nextOffset,
-      String customerId,
-      SubscriptionService service,
-      SubscriptionSubscriptionsForCustomerParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.customerId = customerId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into SubscriptionSubscriptionsForCustomerResponse object (no service
-   * context). Use this when you only need to read a single page (no nextPage()).
-   */
-  public static SubscriptionSubscriptionsForCustomerResponse fromJson(String json) {
-    try {
-
-      List<SubscriptionSubscriptionsForCustomerItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(SubscriptionSubscriptionsForCustomerItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new SubscriptionSubscriptionsForCustomerResponse(
-          list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse SubscriptionSubscriptionsForCustomerResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into SubscriptionSubscriptionsForCustomerResponse object with service
-   * context for pagination (enables nextPage()).
-   */
-  public static SubscriptionSubscriptionsForCustomerResponse fromJson(
-      String json,
-      SubscriptionService service,
-      SubscriptionSubscriptionsForCustomerParams originalParams,
-      String customerId,
-      Response httpResponse) {
-    try {
-
-      List<SubscriptionSubscriptionsForCustomerItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(SubscriptionSubscriptionsForCustomerItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new SubscriptionSubscriptionsForCustomerResponse(
-          list, nextOffset, customerId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse SubscriptionSubscriptionsForCustomerResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<SubscriptionSubscriptionsForCustomerItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public SubscriptionSubscriptionsForCustomerResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    SubscriptionSubscriptionsForCustomerParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : SubscriptionSubscriptionsForCustomerParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.subscriptionsForCustomer(customerId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class SubscriptionSubscriptionsForCustomerItem {
-
-    private Subscription subscription;
-
-    public Subscription getSubscription() {
-      return subscription;
-    }
-
-    public static SubscriptionSubscriptionsForCustomerItem fromJson(String json) {
-      SubscriptionSubscriptionsForCustomerItem item =
-          new SubscriptionSubscriptionsForCustomerItem();
-
-      String __subscriptionJson = JsonUtil.getObject(json, "subscription");
-      if (__subscriptionJson != null) {
-        item.subscription = Subscription.fromJson(__subscriptionJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscriptionEntitlement/SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse.java b/src/main/java/com/chargebee/v4/core/responses/subscriptionEntitlement/SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse.java
deleted file mode 100644
index f65aebd3..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/subscriptionEntitlement/SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse.java
+++ /dev/null
@@ -1,92 +0,0 @@
-package com.chargebee.v4.core.responses.subscriptionEntitlement;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.subscriptionEntitlement.SubscriptionEntitlement;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for SubscriptionEntitlementSetSubscriptionEntitlementAvailability
- * operation. Contains the response data from the API.
- */
-public final class SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse
-    extends BaseResponse {
-  private final List<SubscriptionEntitlement> list;
-
-  private SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.list = builder.list;
-  }
-
-  /**
-   * Parse JSON response into SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse
-   * object.
-   */
-  public static SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse fromJson(
-      String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse
-   * object with HTTP response.
-   */
-  public static SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      builder.list(
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(SubscriptionEntitlement::fromJson)
-              .collect(java.util.stream.Collectors.toList()));
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse from JSON",
-          e);
-    }
-  }
-
-  /**
-   * Create a new builder for SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse.
-   */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse. */
-  public static class Builder {
-
-    private List<SubscriptionEntitlement> list;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder list(List<SubscriptionEntitlement> list) {
-      this.list = list;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse build() {
-      return new SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse(this);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<SubscriptionEntitlement> getList() {
-    return list;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscriptionEntitlement/SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse.java b/src/main/java/com/chargebee/v4/core/responses/subscriptionEntitlement/SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse.java
deleted file mode 100644
index dd7089c7..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/subscriptionEntitlement/SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse.java
+++ /dev/null
@@ -1,186 +0,0 @@
-package com.chargebee.v4.core.responses.subscriptionEntitlement;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.subscriptionEntitlement.SubscriptionEntitlement;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.SubscriptionEntitlementService;
-import com.chargebee.v4.core.models.subscriptionEntitlement.params.SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams;
-
-/**
- * Immutable response object for SubscriptionEntitlementSubscriptionEntitlementsForSubscription
- * operation. Contains paginated list data.
- */
-public final class SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse {
-
-  private final List<SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem> list;
-
-  private final String nextOffset;
-
-  private final String subscriptionId;
-
-  private final SubscriptionEntitlementService service;
-  private final SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams originalParams;
-  private final Response httpResponse;
-
-  private SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse(
-      List<SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem> list,
-      String nextOffset,
-      String subscriptionId,
-      SubscriptionEntitlementService service,
-      SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.subscriptionId = subscriptionId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse
-   * object (no service context). Use this when you only need to read a single page (no nextPage()).
-   */
-  public static SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse fromJson(
-      String json) {
-    try {
-
-      List<SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse(
-          list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse from JSON",
-          e);
-    }
-  }
-
-  /**
-   * Parse JSON response into SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse
-   * object with service context for pagination (enables nextPage()).
-   */
-  public static SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse fromJson(
-      String json,
-      SubscriptionEntitlementService service,
-      SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams originalParams,
-      String subscriptionId,
-      Response httpResponse) {
-    try {
-
-      List<SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse(
-          list, nextOffset, subscriptionId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse from JSON",
-          e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse nextPage()
-      throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.subscriptionEntitlementsForSubscription(subscriptionId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem {
-
-    private SubscriptionEntitlement subscriptionEntitlement;
-
-    public SubscriptionEntitlement getSubscriptionEntitlement() {
-      return subscriptionEntitlement;
-    }
-
-    public static SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem fromJson(
-        String json) {
-      SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem item =
-          new SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem();
-
-      String __subscriptionEntitlementJson = JsonUtil.getObject(json, "subscription_entitlement");
-      if (__subscriptionEntitlementJson != null) {
-        item.subscriptionEntitlement =
-            SubscriptionEntitlement.fromJson(__subscriptionEntitlementJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscriptionSetting/SubscriptionSettingRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/subscriptionSetting/SubscriptionSettingRetrieveResponse.java
deleted file mode 100644
index 1a9d7d12..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/subscriptionSetting/SubscriptionSettingRetrieveResponse.java
+++ /dev/null
@@ -1,42 +0,0 @@
-package com.chargebee.v4.core.responses.subscriptionSetting;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for SubscriptionSettingRetrieve operation. Contains the response data
- * from a single resource get operation.
- */
-public final class SubscriptionSettingRetrieveResponse extends BaseResponse {
-  private final Object subscriptionSetting;
-
-  private SubscriptionSettingRetrieveResponse(Object subscriptionSetting, Response httpResponse) {
-    super(httpResponse);
-
-    this.subscriptionSetting = subscriptionSetting;
-  }
-
-  /** Parse JSON response into SubscriptionSettingRetrieveResponse object. */
-  public static SubscriptionSettingRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into SubscriptionSettingRetrieveResponse object with HTTP response. */
-  public static SubscriptionSettingRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Object subscriptionSetting = JsonUtil.getObject(json, "subscription_setting");
-
-      return new SubscriptionSettingRetrieveResponse(subscriptionSetting, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse SubscriptionSettingRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the subscriptionSetting from the response. */
-  public Object getSubscriptionSetting() {
-    return subscriptionSetting;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/thirdPartyConfiguration/ThirdPartyConfigurationConfigurationsResponse.java b/src/main/java/com/chargebee/v4/core/responses/thirdPartyConfiguration/ThirdPartyConfigurationConfigurationsResponse.java
deleted file mode 100644
index bced60d5..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/thirdPartyConfiguration/ThirdPartyConfigurationConfigurationsResponse.java
+++ /dev/null
@@ -1,51 +0,0 @@
-package com.chargebee.v4.core.responses.thirdPartyConfiguration;
-
-import com.chargebee.v4.core.models.thirdPartyConfiguration.ThirdPartyConfiguration;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ThirdPartyConfigurationConfigurations operation. Contains the
- * response data from a single resource get operation.
- */
-public final class ThirdPartyConfigurationConfigurationsResponse extends BaseResponse {
-  private final ThirdPartyConfiguration thirdPartyConfiguration;
-
-  private ThirdPartyConfigurationConfigurationsResponse(
-      ThirdPartyConfiguration thirdPartyConfiguration, Response httpResponse) {
-    super(httpResponse);
-
-    this.thirdPartyConfiguration = thirdPartyConfiguration;
-  }
-
-  /** Parse JSON response into ThirdPartyConfigurationConfigurationsResponse object. */
-  public static ThirdPartyConfigurationConfigurationsResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into ThirdPartyConfigurationConfigurationsResponse object with HTTP
-   * response.
-   */
-  public static ThirdPartyConfigurationConfigurationsResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      ThirdPartyConfiguration thirdPartyConfiguration =
-          ThirdPartyConfiguration.fromJson(JsonUtil.getObject(json, "third_party_configuration"));
-
-      return new ThirdPartyConfigurationConfigurationsResponse(
-          thirdPartyConfiguration, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ThirdPartyConfigurationConfigurationsResponse from JSON", e);
-    }
-  }
-
-  /** Get the thirdPartyConfiguration from the response. */
-  public ThirdPartyConfiguration getThirdPartyConfiguration() {
-    return thirdPartyConfiguration;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/thirdPartyConfiguration/ThirdPartyConfigurationRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/thirdPartyConfiguration/ThirdPartyConfigurationRetrieveResponse.java
deleted file mode 100644
index b783d4ae..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/thirdPartyConfiguration/ThirdPartyConfigurationRetrieveResponse.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.chargebee.v4.core.responses.thirdPartyConfiguration;
-
-import com.chargebee.v4.core.models.thirdPartyConfiguration.ThirdPartyConfiguration;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ThirdPartyConfigurationRetrieve operation. Contains the response
- * data from a single resource get operation.
- */
-public final class ThirdPartyConfigurationRetrieveResponse extends BaseResponse {
-  private final ThirdPartyConfiguration thirdPartyConfiguration;
-
-  private ThirdPartyConfigurationRetrieveResponse(
-      ThirdPartyConfiguration thirdPartyConfiguration, Response httpResponse) {
-    super(httpResponse);
-
-    this.thirdPartyConfiguration = thirdPartyConfiguration;
-  }
-
-  /** Parse JSON response into ThirdPartyConfigurationRetrieveResponse object. */
-  public static ThirdPartyConfigurationRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into ThirdPartyConfigurationRetrieveResponse object with HTTP response. */
-  public static ThirdPartyConfigurationRetrieveResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      ThirdPartyConfiguration thirdPartyConfiguration =
-          ThirdPartyConfiguration.fromJson(JsonUtil.getObject(json, "third_party_configuration"));
-
-      return new ThirdPartyConfigurationRetrieveResponse(thirdPartyConfiguration, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ThirdPartyConfigurationRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the thirdPartyConfiguration from the response. */
-  public ThirdPartyConfiguration getThirdPartyConfiguration() {
-    return thirdPartyConfiguration;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/thirdPartyEntityMapping/ThirdPartyEntityMappingListAllResponse.java b/src/main/java/com/chargebee/v4/core/responses/thirdPartyEntityMapping/ThirdPartyEntityMappingListAllResponse.java
deleted file mode 100644
index a5b969c7..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/thirdPartyEntityMapping/ThirdPartyEntityMappingListAllResponse.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.chargebee.v4.core.responses.thirdPartyEntityMapping;
-
-import com.chargebee.v4.core.models.thirdPartyEntityMapping.ThirdPartyEntityMapping;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ThirdPartyEntityMappingListAll operation. Contains the response
- * data from a single resource get operation.
- */
-public final class ThirdPartyEntityMappingListAllResponse extends BaseResponse {
-  private final ThirdPartyEntityMapping thirdPartyEntityMapping;
-
-  private ThirdPartyEntityMappingListAllResponse(
-      ThirdPartyEntityMapping thirdPartyEntityMapping, Response httpResponse) {
-    super(httpResponse);
-
-    this.thirdPartyEntityMapping = thirdPartyEntityMapping;
-  }
-
-  /** Parse JSON response into ThirdPartyEntityMappingListAllResponse object. */
-  public static ThirdPartyEntityMappingListAllResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into ThirdPartyEntityMappingListAllResponse object with HTTP response. */
-  public static ThirdPartyEntityMappingListAllResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      ThirdPartyEntityMapping thirdPartyEntityMapping =
-          ThirdPartyEntityMapping.fromJson(JsonUtil.getObject(json, "third_party_entity_mapping"));
-
-      return new ThirdPartyEntityMappingListAllResponse(thirdPartyEntityMapping, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ThirdPartyEntityMappingListAllResponse from JSON", e);
-    }
-  }
-
-  /** Get the thirdPartyEntityMapping from the response. */
-  public ThirdPartyEntityMapping getThirdPartyEntityMapping() {
-    return thirdPartyEntityMapping;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/thirdPartyEntityMapping/ThirdPartyEntityMappingRetrieveEntityResponse.java b/src/main/java/com/chargebee/v4/core/responses/thirdPartyEntityMapping/ThirdPartyEntityMappingRetrieveEntityResponse.java
deleted file mode 100644
index f86095e5..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/thirdPartyEntityMapping/ThirdPartyEntityMappingRetrieveEntityResponse.java
+++ /dev/null
@@ -1,51 +0,0 @@
-package com.chargebee.v4.core.responses.thirdPartyEntityMapping;
-
-import com.chargebee.v4.core.models.thirdPartyEntityMapping.ThirdPartyEntityMapping;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ThirdPartyEntityMappingRetrieveEntity operation. Contains the
- * response data from a single resource get operation.
- */
-public final class ThirdPartyEntityMappingRetrieveEntityResponse extends BaseResponse {
-  private final ThirdPartyEntityMapping thirdPartyEntityMapping;
-
-  private ThirdPartyEntityMappingRetrieveEntityResponse(
-      ThirdPartyEntityMapping thirdPartyEntityMapping, Response httpResponse) {
-    super(httpResponse);
-
-    this.thirdPartyEntityMapping = thirdPartyEntityMapping;
-  }
-
-  /** Parse JSON response into ThirdPartyEntityMappingRetrieveEntityResponse object. */
-  public static ThirdPartyEntityMappingRetrieveEntityResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into ThirdPartyEntityMappingRetrieveEntityResponse object with HTTP
-   * response.
-   */
-  public static ThirdPartyEntityMappingRetrieveEntityResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      ThirdPartyEntityMapping thirdPartyEntityMapping =
-          ThirdPartyEntityMapping.fromJson(JsonUtil.getObject(json, "third_party_entity_mapping"));
-
-      return new ThirdPartyEntityMappingRetrieveEntityResponse(
-          thirdPartyEntityMapping, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ThirdPartyEntityMappingRetrieveEntityResponse from JSON", e);
-    }
-  }
-
-  /** Get the thirdPartyEntityMapping from the response. */
-  public ThirdPartyEntityMapping getThirdPartyEntityMapping() {
-    return thirdPartyEntityMapping;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/thirdPartySyncDetail/ThirdPartySyncDetailRetrieveLatestSyncResponse.java b/src/main/java/com/chargebee/v4/core/responses/thirdPartySyncDetail/ThirdPartySyncDetailRetrieveLatestSyncResponse.java
deleted file mode 100644
index 3ff377bd..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/thirdPartySyncDetail/ThirdPartySyncDetailRetrieveLatestSyncResponse.java
+++ /dev/null
@@ -1,50 +0,0 @@
-package com.chargebee.v4.core.responses.thirdPartySyncDetail;
-
-import com.chargebee.v4.core.models.thirdPartySyncDetail.ThirdPartySyncDetail;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ThirdPartySyncDetailRetrieveLatestSync operation. Contains the
- * response data from a single resource get operation.
- */
-public final class ThirdPartySyncDetailRetrieveLatestSyncResponse extends BaseResponse {
-  private final ThirdPartySyncDetail thirdPartySyncDetail;
-
-  private ThirdPartySyncDetailRetrieveLatestSyncResponse(
-      ThirdPartySyncDetail thirdPartySyncDetail, Response httpResponse) {
-    super(httpResponse);
-
-    this.thirdPartySyncDetail = thirdPartySyncDetail;
-  }
-
-  /** Parse JSON response into ThirdPartySyncDetailRetrieveLatestSyncResponse object. */
-  public static ThirdPartySyncDetailRetrieveLatestSyncResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into ThirdPartySyncDetailRetrieveLatestSyncResponse object with HTTP
-   * response.
-   */
-  public static ThirdPartySyncDetailRetrieveLatestSyncResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      ThirdPartySyncDetail thirdPartySyncDetail =
-          ThirdPartySyncDetail.fromJson(JsonUtil.getObject(json, "third_party_sync_detail"));
-
-      return new ThirdPartySyncDetailRetrieveLatestSyncResponse(thirdPartySyncDetail, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ThirdPartySyncDetailRetrieveLatestSyncResponse from JSON", e);
-    }
-  }
-
-  /** Get the thirdPartySyncDetail from the response. */
-  public ThirdPartySyncDetail getThirdPartySyncDetail() {
-    return thirdPartySyncDetail;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/thirdPartySyncDetail/ThirdPartySyncDetailRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/thirdPartySyncDetail/ThirdPartySyncDetailRetrieveResponse.java
deleted file mode 100644
index aac1f7c0..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/thirdPartySyncDetail/ThirdPartySyncDetailRetrieveResponse.java
+++ /dev/null
@@ -1,46 +0,0 @@
-package com.chargebee.v4.core.responses.thirdPartySyncDetail;
-
-import com.chargebee.v4.core.models.thirdPartySyncDetail.ThirdPartySyncDetail;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for ThirdPartySyncDetailRetrieve operation. Contains the response data
- * from a single resource get operation.
- */
-public final class ThirdPartySyncDetailRetrieveResponse extends BaseResponse {
-  private final ThirdPartySyncDetail thirdPartySyncDetail;
-
-  private ThirdPartySyncDetailRetrieveResponse(
-      ThirdPartySyncDetail thirdPartySyncDetail, Response httpResponse) {
-    super(httpResponse);
-
-    this.thirdPartySyncDetail = thirdPartySyncDetail;
-  }
-
-  /** Parse JSON response into ThirdPartySyncDetailRetrieveResponse object. */
-  public static ThirdPartySyncDetailRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into ThirdPartySyncDetailRetrieveResponse object with HTTP response. */
-  public static ThirdPartySyncDetailRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      ThirdPartySyncDetail thirdPartySyncDetail =
-          ThirdPartySyncDetail.fromJson(JsonUtil.getObject(json, "third_party_sync_detail"));
-
-      return new ThirdPartySyncDetailRetrieveResponse(thirdPartySyncDetail, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse ThirdPartySyncDetailRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the thirdPartySyncDetail from the response. */
-  public ThirdPartySyncDetail getThirdPartySyncDetail() {
-    return thirdPartySyncDetail;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/timeMachine/TimeMachineRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/timeMachine/TimeMachineRetrieveResponse.java
deleted file mode 100644
index 7da73cd1..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/timeMachine/TimeMachineRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.timeMachine;
-
-import com.chargebee.v4.core.models.timeMachine.TimeMachine;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for TimeMachineRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class TimeMachineRetrieveResponse extends BaseResponse {
-  private final TimeMachine timeMachine;
-
-  private TimeMachineRetrieveResponse(TimeMachine timeMachine, Response httpResponse) {
-    super(httpResponse);
-
-    this.timeMachine = timeMachine;
-  }
-
-  /** Parse JSON response into TimeMachineRetrieveResponse object. */
-  public static TimeMachineRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into TimeMachineRetrieveResponse object with HTTP response. */
-  public static TimeMachineRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      TimeMachine timeMachine = TimeMachine.fromJson(JsonUtil.getObject(json, "time_machine"));
-
-      return new TimeMachineRetrieveResponse(timeMachine, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse TimeMachineRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the timeMachine from the response. */
-  public TimeMachine getTimeMachine() {
-    return timeMachine;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/tpSiteUser/TpSiteUserGuestsForTpSiteUserResponse.java b/src/main/java/com/chargebee/v4/core/responses/tpSiteUser/TpSiteUserGuestsForTpSiteUserResponse.java
deleted file mode 100644
index b610bd79..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/tpSiteUser/TpSiteUserGuestsForTpSiteUserResponse.java
+++ /dev/null
@@ -1,178 +0,0 @@
-package com.chargebee.v4.core.responses.tpSiteUser;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.tpSiteUser.TpSiteUser;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.TpSiteUserService;
-import com.chargebee.v4.core.models.tpSiteUser.params.TpSiteUserGuestsForTpSiteUserParams;
-
-/**
- * Immutable response object for TpSiteUserGuestsForTpSiteUser operation. Contains paginated list
- * data.
- */
-public final class TpSiteUserGuestsForTpSiteUserResponse {
-
-  private final List<TpSiteUserGuestsForTpSiteUserItem> list;
-
-  private final String nextOffset;
-
-  private final String tpSiteUserDomain;
-
-  private final TpSiteUserService service;
-  private final TpSiteUserGuestsForTpSiteUserParams originalParams;
-  private final Response httpResponse;
-
-  private TpSiteUserGuestsForTpSiteUserResponse(
-      List<TpSiteUserGuestsForTpSiteUserItem> list,
-      String nextOffset,
-      String tpSiteUserDomain,
-      TpSiteUserService service,
-      TpSiteUserGuestsForTpSiteUserParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.tpSiteUserDomain = tpSiteUserDomain;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into TpSiteUserGuestsForTpSiteUserResponse object (no service context). Use
-   * this when you only need to read a single page (no nextPage()).
-   */
-  public static TpSiteUserGuestsForTpSiteUserResponse fromJson(String json) {
-    try {
-
-      List<TpSiteUserGuestsForTpSiteUserItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(TpSiteUserGuestsForTpSiteUserItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new TpSiteUserGuestsForTpSiteUserResponse(list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse TpSiteUserGuestsForTpSiteUserResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into TpSiteUserGuestsForTpSiteUserResponse object with service context for
-   * pagination (enables nextPage()).
-   */
-  public static TpSiteUserGuestsForTpSiteUserResponse fromJson(
-      String json,
-      TpSiteUserService service,
-      TpSiteUserGuestsForTpSiteUserParams originalParams,
-      String tpSiteUserDomain,
-      Response httpResponse) {
-    try {
-
-      List<TpSiteUserGuestsForTpSiteUserItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(TpSiteUserGuestsForTpSiteUserItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new TpSiteUserGuestsForTpSiteUserResponse(
-          list, nextOffset, tpSiteUserDomain, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse TpSiteUserGuestsForTpSiteUserResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<TpSiteUserGuestsForTpSiteUserItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public TpSiteUserGuestsForTpSiteUserResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    TpSiteUserGuestsForTpSiteUserParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : TpSiteUserGuestsForTpSiteUserParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.guestsForTpSiteUser(tpSiteUserDomain, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class TpSiteUserGuestsForTpSiteUserItem {
-
-    private TpSiteUser tpSiteUser;
-
-    public TpSiteUser getTpSiteUser() {
-      return tpSiteUser;
-    }
-
-    public static TpSiteUserGuestsForTpSiteUserItem fromJson(String json) {
-      TpSiteUserGuestsForTpSiteUserItem item = new TpSiteUserGuestsForTpSiteUserItem();
-
-      String __tpSiteUserJson = JsonUtil.getObject(json, "tp_site_user");
-      if (__tpSiteUserJson != null) {
-        item.tpSiteUser = TpSiteUser.fromJson(__tpSiteUserJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/tpSiteUser/TpSiteUserUsersForTpSiteUserResponse.java b/src/main/java/com/chargebee/v4/core/responses/tpSiteUser/TpSiteUserUsersForTpSiteUserResponse.java
deleted file mode 100644
index 72d7e3e3..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/tpSiteUser/TpSiteUserUsersForTpSiteUserResponse.java
+++ /dev/null
@@ -1,178 +0,0 @@
-package com.chargebee.v4.core.responses.tpSiteUser;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.tpSiteUser.TpSiteUser;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.TpSiteUserService;
-import com.chargebee.v4.core.models.tpSiteUser.params.TpSiteUserUsersForTpSiteUserParams;
-
-/**
- * Immutable response object for TpSiteUserUsersForTpSiteUser operation. Contains paginated list
- * data.
- */
-public final class TpSiteUserUsersForTpSiteUserResponse {
-
-  private final List<TpSiteUserUsersForTpSiteUserItem> list;
-
-  private final String nextOffset;
-
-  private final String tpSiteUserDomain;
-
-  private final TpSiteUserService service;
-  private final TpSiteUserUsersForTpSiteUserParams originalParams;
-  private final Response httpResponse;
-
-  private TpSiteUserUsersForTpSiteUserResponse(
-      List<TpSiteUserUsersForTpSiteUserItem> list,
-      String nextOffset,
-      String tpSiteUserDomain,
-      TpSiteUserService service,
-      TpSiteUserUsersForTpSiteUserParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.tpSiteUserDomain = tpSiteUserDomain;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into TpSiteUserUsersForTpSiteUserResponse object (no service context). Use
-   * this when you only need to read a single page (no nextPage()).
-   */
-  public static TpSiteUserUsersForTpSiteUserResponse fromJson(String json) {
-    try {
-
-      List<TpSiteUserUsersForTpSiteUserItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(TpSiteUserUsersForTpSiteUserItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new TpSiteUserUsersForTpSiteUserResponse(list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse TpSiteUserUsersForTpSiteUserResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into TpSiteUserUsersForTpSiteUserResponse object with service context for
-   * pagination (enables nextPage()).
-   */
-  public static TpSiteUserUsersForTpSiteUserResponse fromJson(
-      String json,
-      TpSiteUserService service,
-      TpSiteUserUsersForTpSiteUserParams originalParams,
-      String tpSiteUserDomain,
-      Response httpResponse) {
-    try {
-
-      List<TpSiteUserUsersForTpSiteUserItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(TpSiteUserUsersForTpSiteUserItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new TpSiteUserUsersForTpSiteUserResponse(
-          list, nextOffset, tpSiteUserDomain, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse TpSiteUserUsersForTpSiteUserResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<TpSiteUserUsersForTpSiteUserItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public TpSiteUserUsersForTpSiteUserResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    TpSiteUserUsersForTpSiteUserParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : TpSiteUserUsersForTpSiteUserParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.usersForTpSiteUser(tpSiteUserDomain, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class TpSiteUserUsersForTpSiteUserItem {
-
-    private TpSiteUser tpSiteUser;
-
-    public TpSiteUser getTpSiteUser() {
-      return tpSiteUser;
-    }
-
-    public static TpSiteUserUsersForTpSiteUserItem fromJson(String json) {
-      TpSiteUserUsersForTpSiteUserItem item = new TpSiteUserUsersForTpSiteUserItem();
-
-      String __tpSiteUserJson = JsonUtil.getObject(json, "tp_site_user");
-      if (__tpSiteUserJson != null) {
-        item.tpSiteUser = TpSiteUser.fromJson(__tpSiteUserJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionDeleteOfflineTransactionResponse.java b/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionDeleteOfflineTransactionResponse.java
deleted file mode 100644
index 5fd4a4dd..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionDeleteOfflineTransactionResponse.java
+++ /dev/null
@@ -1,81 +0,0 @@
-package com.chargebee.v4.core.responses.transaction;
-
-import com.chargebee.v4.core.models.transaction.Transaction;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for TransactionDeleteOfflineTransaction operation. Contains the
- * response data from the API.
- */
-public final class TransactionDeleteOfflineTransactionResponse extends BaseResponse {
-  private final Transaction transaction;
-
-  private TransactionDeleteOfflineTransactionResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.transaction = builder.transaction;
-  }
-
-  /** Parse JSON response into TransactionDeleteOfflineTransactionResponse object. */
-  public static TransactionDeleteOfflineTransactionResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into TransactionDeleteOfflineTransactionResponse object with HTTP response.
-   */
-  public static TransactionDeleteOfflineTransactionResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __transactionJson = JsonUtil.getObject(json, "transaction");
-      if (__transactionJson != null) {
-        builder.transaction(Transaction.fromJson(__transactionJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse TransactionDeleteOfflineTransactionResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for TransactionDeleteOfflineTransactionResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for TransactionDeleteOfflineTransactionResponse. */
-  public static class Builder {
-
-    private Transaction transaction;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder transaction(Transaction transaction) {
-      this.transaction = transaction;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public TransactionDeleteOfflineTransactionResponse build() {
-      return new TransactionDeleteOfflineTransactionResponse(this);
-    }
-  }
-
-  /** Get the transaction from the response. */
-  public Transaction getTransaction() {
-    return transaction;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionRetrieveResponse.java
deleted file mode 100644
index 0576dbc0..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.transaction;
-
-import com.chargebee.v4.core.models.transaction.Transaction;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for TransactionRetrieve operation. Contains the response data from a
- * single resource get operation.
- */
-public final class TransactionRetrieveResponse extends BaseResponse {
-  private final Transaction transaction;
-
-  private TransactionRetrieveResponse(Transaction transaction, Response httpResponse) {
-    super(httpResponse);
-
-    this.transaction = transaction;
-  }
-
-  /** Parse JSON response into TransactionRetrieveResponse object. */
-  public static TransactionRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into TransactionRetrieveResponse object with HTTP response. */
-  public static TransactionRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Transaction transaction = Transaction.fromJson(JsonUtil.getObject(json, "transaction"));
-
-      return new TransactionRetrieveResponse(transaction, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse TransactionRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the transaction from the response. */
-  public Transaction getTransaction() {
-    return transaction;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionSyncTransactionResponse.java b/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionSyncTransactionResponse.java
deleted file mode 100644
index bb4dcbae..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionSyncTransactionResponse.java
+++ /dev/null
@@ -1,77 +0,0 @@
-package com.chargebee.v4.core.responses.transaction;
-
-import com.chargebee.v4.core.models.transaction.Transaction;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for TransactionSyncTransaction operation. Contains the response data
- * from the API.
- */
-public final class TransactionSyncTransactionResponse extends BaseResponse {
-  private final Transaction transaction;
-
-  private TransactionSyncTransactionResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.transaction = builder.transaction;
-  }
-
-  /** Parse JSON response into TransactionSyncTransactionResponse object. */
-  public static TransactionSyncTransactionResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into TransactionSyncTransactionResponse object with HTTP response. */
-  public static TransactionSyncTransactionResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __transactionJson = JsonUtil.getObject(json, "transaction");
-      if (__transactionJson != null) {
-        builder.transaction(Transaction.fromJson(__transactionJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse TransactionSyncTransactionResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for TransactionSyncTransactionResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for TransactionSyncTransactionResponse. */
-  public static class Builder {
-
-    private Transaction transaction;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder transaction(Transaction transaction) {
-      this.transaction = transaction;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public TransactionSyncTransactionResponse build() {
-      return new TransactionSyncTransactionResponse(this);
-    }
-  }
-
-  /** Get the transaction from the response. */
-  public Transaction getTransaction() {
-    return transaction;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionTransactionsForCustomerResponse.java b/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionTransactionsForCustomerResponse.java
deleted file mode 100644
index 56193705..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionTransactionsForCustomerResponse.java
+++ /dev/null
@@ -1,179 +0,0 @@
-package com.chargebee.v4.core.responses.transaction;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.transaction.Transaction;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.TransactionService;
-import com.chargebee.v4.core.models.transaction.params.TransactionTransactionsForCustomerParams;
-
-/**
- * Immutable response object for TransactionTransactionsForCustomer operation. Contains paginated
- * list data.
- */
-public final class TransactionTransactionsForCustomerResponse {
-
-  private final List<TransactionTransactionsForCustomerItem> list;
-
-  private final String nextOffset;
-
-  private final String customerId;
-
-  private final TransactionService service;
-  private final TransactionTransactionsForCustomerParams originalParams;
-  private final Response httpResponse;
-
-  private TransactionTransactionsForCustomerResponse(
-      List<TransactionTransactionsForCustomerItem> list,
-      String nextOffset,
-      String customerId,
-      TransactionService service,
-      TransactionTransactionsForCustomerParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.customerId = customerId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into TransactionTransactionsForCustomerResponse object (no service
-   * context). Use this when you only need to read a single page (no nextPage()).
-   */
-  public static TransactionTransactionsForCustomerResponse fromJson(String json) {
-    try {
-
-      List<TransactionTransactionsForCustomerItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(TransactionTransactionsForCustomerItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new TransactionTransactionsForCustomerResponse(
-          list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse TransactionTransactionsForCustomerResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into TransactionTransactionsForCustomerResponse object with service context
-   * for pagination (enables nextPage()).
-   */
-  public static TransactionTransactionsForCustomerResponse fromJson(
-      String json,
-      TransactionService service,
-      TransactionTransactionsForCustomerParams originalParams,
-      String customerId,
-      Response httpResponse) {
-    try {
-
-      List<TransactionTransactionsForCustomerItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(TransactionTransactionsForCustomerItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new TransactionTransactionsForCustomerResponse(
-          list, nextOffset, customerId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse TransactionTransactionsForCustomerResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<TransactionTransactionsForCustomerItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public TransactionTransactionsForCustomerResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    TransactionTransactionsForCustomerParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : TransactionTransactionsForCustomerParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.transactionsForCustomer(customerId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class TransactionTransactionsForCustomerItem {
-
-    private Transaction transaction;
-
-    public Transaction getTransaction() {
-      return transaction;
-    }
-
-    public static TransactionTransactionsForCustomerItem fromJson(String json) {
-      TransactionTransactionsForCustomerItem item = new TransactionTransactionsForCustomerItem();
-
-      String __transactionJson = JsonUtil.getObject(json, "transaction");
-      if (__transactionJson != null) {
-        item.transaction = Transaction.fromJson(__transactionJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionTransactionsForSubscriptionResponse.java b/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionTransactionsForSubscriptionResponse.java
deleted file mode 100644
index 6df2c7f9..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionTransactionsForSubscriptionResponse.java
+++ /dev/null
@@ -1,180 +0,0 @@
-package com.chargebee.v4.core.responses.transaction;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.transaction.Transaction;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.TransactionService;
-import com.chargebee.v4.core.models.transaction.params.TransactionTransactionsForSubscriptionParams;
-
-/**
- * Immutable response object for TransactionTransactionsForSubscription operation. Contains
- * paginated list data.
- */
-public final class TransactionTransactionsForSubscriptionResponse {
-
-  private final List<TransactionTransactionsForSubscriptionItem> list;
-
-  private final String nextOffset;
-
-  private final String subscriptionId;
-
-  private final TransactionService service;
-  private final TransactionTransactionsForSubscriptionParams originalParams;
-  private final Response httpResponse;
-
-  private TransactionTransactionsForSubscriptionResponse(
-      List<TransactionTransactionsForSubscriptionItem> list,
-      String nextOffset,
-      String subscriptionId,
-      TransactionService service,
-      TransactionTransactionsForSubscriptionParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.subscriptionId = subscriptionId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into TransactionTransactionsForSubscriptionResponse object (no service
-   * context). Use this when you only need to read a single page (no nextPage()).
-   */
-  public static TransactionTransactionsForSubscriptionResponse fromJson(String json) {
-    try {
-
-      List<TransactionTransactionsForSubscriptionItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(TransactionTransactionsForSubscriptionItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new TransactionTransactionsForSubscriptionResponse(
-          list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse TransactionTransactionsForSubscriptionResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into TransactionTransactionsForSubscriptionResponse object with service
-   * context for pagination (enables nextPage()).
-   */
-  public static TransactionTransactionsForSubscriptionResponse fromJson(
-      String json,
-      TransactionService service,
-      TransactionTransactionsForSubscriptionParams originalParams,
-      String subscriptionId,
-      Response httpResponse) {
-    try {
-
-      List<TransactionTransactionsForSubscriptionItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(TransactionTransactionsForSubscriptionItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new TransactionTransactionsForSubscriptionResponse(
-          list, nextOffset, subscriptionId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse TransactionTransactionsForSubscriptionResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<TransactionTransactionsForSubscriptionItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public TransactionTransactionsForSubscriptionResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    TransactionTransactionsForSubscriptionParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : TransactionTransactionsForSubscriptionParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.transactionsForSubscription(subscriptionId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class TransactionTransactionsForSubscriptionItem {
-
-    private Transaction transaction;
-
-    public Transaction getTransaction() {
-      return transaction;
-    }
-
-    public static TransactionTransactionsForSubscriptionItem fromJson(String json) {
-      TransactionTransactionsForSubscriptionItem item =
-          new TransactionTransactionsForSubscriptionItem();
-
-      String __transactionJson = JsonUtil.getObject(json, "transaction");
-      if (__transactionJson != null) {
-        item.transaction = Transaction.fromJson(__transactionJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionVoidTransactionResponse.java b/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionVoidTransactionResponse.java
deleted file mode 100644
index 672b3bb4..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionVoidTransactionResponse.java
+++ /dev/null
@@ -1,77 +0,0 @@
-package com.chargebee.v4.core.responses.transaction;
-
-import com.chargebee.v4.core.models.transaction.Transaction;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for TransactionVoidTransaction operation. Contains the response data
- * from the API.
- */
-public final class TransactionVoidTransactionResponse extends BaseResponse {
-  private final Transaction transaction;
-
-  private TransactionVoidTransactionResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.transaction = builder.transaction;
-  }
-
-  /** Parse JSON response into TransactionVoidTransactionResponse object. */
-  public static TransactionVoidTransactionResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into TransactionVoidTransactionResponse object with HTTP response. */
-  public static TransactionVoidTransactionResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __transactionJson = JsonUtil.getObject(json, "transaction");
-      if (__transactionJson != null) {
-        builder.transaction(Transaction.fromJson(__transactionJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse TransactionVoidTransactionResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for TransactionVoidTransactionResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for TransactionVoidTransactionResponse. */
-  public static class Builder {
-
-    private Transaction transaction;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder transaction(Transaction transaction) {
-      this.transaction = transaction;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public TransactionVoidTransactionResponse build() {
-      return new TransactionVoidTransactionResponse(this);
-    }
-  }
-
-  /** Get the transaction from the response. */
-  public Transaction getTransaction() {
-    return transaction;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeCreateUnbilledChargeResponse.java b/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeCreateUnbilledChargeResponse.java
deleted file mode 100644
index c4587429..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeCreateUnbilledChargeResponse.java
+++ /dev/null
@@ -1,83 +0,0 @@
-package com.chargebee.v4.core.responses.unbilledCharge;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for UnbilledChargeCreateUnbilledCharge operation. Contains the response
- * data from the API.
- */
-public final class UnbilledChargeCreateUnbilledChargeResponse extends BaseResponse {
-  private final List<UnbilledCharge> unbilledCharges;
-
-  private UnbilledChargeCreateUnbilledChargeResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.unbilledCharges = builder.unbilledCharges;
-  }
-
-  /** Parse JSON response into UnbilledChargeCreateUnbilledChargeResponse object. */
-  public static UnbilledChargeCreateUnbilledChargeResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into UnbilledChargeCreateUnbilledChargeResponse object with HTTP response.
-   */
-  public static UnbilledChargeCreateUnbilledChargeResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      builder.unbilledCharges(
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "unbilled_charges")).stream()
-              .map(UnbilledCharge::fromJson)
-              .collect(java.util.stream.Collectors.toList()));
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse UnbilledChargeCreateUnbilledChargeResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for UnbilledChargeCreateUnbilledChargeResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for UnbilledChargeCreateUnbilledChargeResponse. */
-  public static class Builder {
-
-    private List<UnbilledCharge> unbilledCharges;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder unbilledCharges(List<UnbilledCharge> unbilledCharges) {
-      this.unbilledCharges = unbilledCharges;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public UnbilledChargeCreateUnbilledChargeResponse build() {
-      return new UnbilledChargeCreateUnbilledChargeResponse(this);
-    }
-  }
-
-  /** Get the unbilledCharges from the response. */
-  public List<UnbilledCharge> getUnbilledCharges() {
-    return unbilledCharges;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeInvoiceUnbilledChargesResponse.java b/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeInvoiceUnbilledChargesResponse.java
deleted file mode 100644
index 050b7c68..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeInvoiceUnbilledChargesResponse.java
+++ /dev/null
@@ -1,84 +0,0 @@
-package com.chargebee.v4.core.responses.unbilledCharge;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.invoice.Invoice;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for UnbilledChargeInvoiceUnbilledCharges operation. Contains the
- * response data from the API.
- */
-public final class UnbilledChargeInvoiceUnbilledChargesResponse extends BaseResponse {
-  private final List<Invoice> invoices;
-
-  private UnbilledChargeInvoiceUnbilledChargesResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.invoices = builder.invoices;
-  }
-
-  /** Parse JSON response into UnbilledChargeInvoiceUnbilledChargesResponse object. */
-  public static UnbilledChargeInvoiceUnbilledChargesResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /**
-   * Parse JSON response into UnbilledChargeInvoiceUnbilledChargesResponse object with HTTP
-   * response.
-   */
-  public static UnbilledChargeInvoiceUnbilledChargesResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      builder.invoices(
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "invoices")).stream()
-              .map(Invoice::fromJson)
-              .collect(java.util.stream.Collectors.toList()));
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse UnbilledChargeInvoiceUnbilledChargesResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for UnbilledChargeInvoiceUnbilledChargesResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for UnbilledChargeInvoiceUnbilledChargesResponse. */
-  public static class Builder {
-
-    private List<Invoice> invoices;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder invoices(List<Invoice> invoices) {
-      this.invoices = invoices;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public UnbilledChargeInvoiceUnbilledChargesResponse build() {
-      return new UnbilledChargeInvoiceUnbilledChargesResponse(this);
-    }
-  }
-
-  /** Get the invoices from the response. */
-  public List<Invoice> getInvoices() {
-    return invoices;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/unbilledChargesSetting/UnbilledChargesSettingRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/unbilledChargesSetting/UnbilledChargesSettingRetrieveResponse.java
deleted file mode 100644
index 80b6ee26..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/unbilledChargesSetting/UnbilledChargesSettingRetrieveResponse.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.chargebee.v4.core.responses.unbilledChargesSetting;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for UnbilledChargesSettingRetrieve operation. Contains the response
- * data from a single resource get operation.
- */
-public final class UnbilledChargesSettingRetrieveResponse extends BaseResponse {
-  private final Object unbilledChargesSetting;
-
-  private UnbilledChargesSettingRetrieveResponse(
-      Object unbilledChargesSetting, Response httpResponse) {
-    super(httpResponse);
-
-    this.unbilledChargesSetting = unbilledChargesSetting;
-  }
-
-  /** Parse JSON response into UnbilledChargesSettingRetrieveResponse object. */
-  public static UnbilledChargesSettingRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into UnbilledChargesSettingRetrieveResponse object with HTTP response. */
-  public static UnbilledChargesSettingRetrieveResponse fromJson(
-      String json, Response httpResponse) {
-    try {
-
-      Object unbilledChargesSetting = JsonUtil.getObject(json, "unbilled_charges_setting");
-
-      return new UnbilledChargesSettingRetrieveResponse(unbilledChargesSetting, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse UnbilledChargesSettingRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the unbilledChargesSetting from the response. */
-  public Object getUnbilledChargesSetting() {
-    return unbilledChargesSetting;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/usage/UsageRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/usage/UsageRetrieveResponse.java
deleted file mode 100644
index f6bc0a38..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/usage/UsageRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.usage;
-
-import com.chargebee.v4.core.models.usage.Usage;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for UsageRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class UsageRetrieveResponse extends BaseResponse {
-  private final Usage usage;
-
-  private UsageRetrieveResponse(Usage usage, Response httpResponse) {
-    super(httpResponse);
-
-    this.usage = usage;
-  }
-
-  /** Parse JSON response into UsageRetrieveResponse object. */
-  public static UsageRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into UsageRetrieveResponse object with HTTP response. */
-  public static UsageRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Usage usage = Usage.fromJson(JsonUtil.getObject(json, "usage"));
-
-      return new UsageRetrieveResponse(usage, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse UsageRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the usage from the response. */
-  public Usage getUsage() {
-    return usage;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/usageFile/UsageFileProcessingStatusResponse.java b/src/main/java/com/chargebee/v4/core/responses/usageFile/UsageFileProcessingStatusResponse.java
deleted file mode 100644
index a35fd950..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/usageFile/UsageFileProcessingStatusResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.usageFile;
-
-import com.chargebee.v4.core.models.usageFile.UsageFile;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for UsageFileProcessingStatus operation. Contains the response data
- * from a single resource get operation.
- */
-public final class UsageFileProcessingStatusResponse extends BaseResponse {
-  private final UsageFile usageFile;
-
-  private UsageFileProcessingStatusResponse(UsageFile usageFile, Response httpResponse) {
-    super(httpResponse);
-
-    this.usageFile = usageFile;
-  }
-
-  /** Parse JSON response into UsageFileProcessingStatusResponse object. */
-  public static UsageFileProcessingStatusResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into UsageFileProcessingStatusResponse object with HTTP response. */
-  public static UsageFileProcessingStatusResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      UsageFile usageFile = UsageFile.fromJson(JsonUtil.getObject(json, "usage_file"));
-
-      return new UsageFileProcessingStatusResponse(usageFile, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse UsageFileProcessingStatusResponse from JSON", e);
-    }
-  }
-
-  /** Get the usageFile from the response. */
-  public UsageFile getUsageFile() {
-    return usageFile;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/variant/VariantCreateProductVariantResponse.java b/src/main/java/com/chargebee/v4/core/responses/variant/VariantCreateProductVariantResponse.java
deleted file mode 100644
index 834b141b..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/variant/VariantCreateProductVariantResponse.java
+++ /dev/null
@@ -1,78 +0,0 @@
-package com.chargebee.v4.core.responses.variant;
-
-import com.chargebee.v4.core.models.variant.Variant;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for VariantCreateProductVariant operation. Contains the response data
- * from the API.
- */
-public final class VariantCreateProductVariantResponse extends BaseResponse {
-  private final Variant variant;
-
-  private VariantCreateProductVariantResponse(Builder builder) {
-    super(builder.httpResponse);
-
-    this.variant = builder.variant;
-  }
-
-  /** Parse JSON response into VariantCreateProductVariantResponse object. */
-  public static VariantCreateProductVariantResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into VariantCreateProductVariantResponse object with HTTP response. */
-  public static VariantCreateProductVariantResponse fromJson(String json, Response httpResponse) {
-    try {
-      Builder builder = builder();
-
-      String __variantJson = JsonUtil.getObject(json, "variant");
-      if (__variantJson != null) {
-        builder.variant(Variant.fromJson(__variantJson));
-      }
-
-      builder.httpResponse(httpResponse);
-      return builder.build();
-    } catch (Exception e) {
-      throw new RuntimeException(
-          "Failed to parse VariantCreateProductVariantResponse from JSON", e);
-    }
-  }
-
-  /** Create a new builder for VariantCreateProductVariantResponse. */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for VariantCreateProductVariantResponse. */
-  public static class Builder {
-
-    private Variant variant;
-
-    private Response httpResponse;
-
-    private Builder() {}
-
-    public Builder variant(Variant variant) {
-      this.variant = variant;
-      return this;
-    }
-
-    public Builder httpResponse(Response httpResponse) {
-      this.httpResponse = httpResponse;
-      return this;
-    }
-
-    public VariantCreateProductVariantResponse build() {
-      return new VariantCreateProductVariantResponse(this);
-    }
-  }
-
-  /** Get the variant from the response. */
-  public Variant getVariant() {
-    return variant;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/variant/VariantListProductVariantsResponse.java b/src/main/java/com/chargebee/v4/core/responses/variant/VariantListProductVariantsResponse.java
deleted file mode 100644
index e34ca08c..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/variant/VariantListProductVariantsResponse.java
+++ /dev/null
@@ -1,175 +0,0 @@
-package com.chargebee.v4.core.responses.variant;
-
-import java.util.List;
-
-import com.chargebee.v4.core.models.variant.Variant;
-
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.VariantService;
-import com.chargebee.v4.core.models.variant.params.VariantListProductVariantsParams;
-
-/**
- * Immutable response object for VariantListProductVariants operation. Contains paginated list data.
- */
-public final class VariantListProductVariantsResponse {
-
-  private final List<VariantListProductVariantsItem> list;
-
-  private final String nextOffset;
-
-  private final String productId;
-
-  private final VariantService service;
-  private final VariantListProductVariantsParams originalParams;
-  private final Response httpResponse;
-
-  private VariantListProductVariantsResponse(
-      List<VariantListProductVariantsItem> list,
-      String nextOffset,
-      String productId,
-      VariantService service,
-      VariantListProductVariantsParams originalParams,
-      Response httpResponse) {
-
-    this.list = list;
-
-    this.nextOffset = nextOffset;
-
-    this.productId = productId;
-
-    this.service = service;
-    this.originalParams = originalParams;
-    this.httpResponse = httpResponse;
-  }
-
-  /**
-   * Parse JSON response into VariantListProductVariantsResponse object (no service context). Use
-   * this when you only need to read a single page (no nextPage()).
-   */
-  public static VariantListProductVariantsResponse fromJson(String json) {
-    try {
-
-      List<VariantListProductVariantsItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(VariantListProductVariantsItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new VariantListProductVariantsResponse(list, nextOffset, null, null, null, null);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse VariantListProductVariantsResponse from JSON", e);
-    }
-  }
-
-  /**
-   * Parse JSON response into VariantListProductVariantsResponse object with service context for
-   * pagination (enables nextPage()).
-   */
-  public static VariantListProductVariantsResponse fromJson(
-      String json,
-      VariantService service,
-      VariantListProductVariantsParams originalParams,
-      String productId,
-      Response httpResponse) {
-    try {
-
-      List<VariantListProductVariantsItem> list =
-          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
-              .map(VariantListProductVariantsItem::fromJson)
-              .collect(java.util.stream.Collectors.toList());
-
-      String nextOffset = JsonUtil.getString(json, "next_offset");
-
-      return new VariantListProductVariantsResponse(
-          list, nextOffset, productId, service, originalParams, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse VariantListProductVariantsResponse from JSON", e);
-    }
-  }
-
-  /** Get the list from the response. */
-  public List<VariantListProductVariantsItem> getList() {
-    return list;
-  }
-
-  /** Get the nextOffset from the response. */
-  public String getNextOffset() {
-    return nextOffset;
-  }
-
-  /** Check if there are more pages available. */
-  public boolean hasNextPage() {
-    return nextOffset != null && !nextOffset.isEmpty();
-  }
-
-  /**
-   * Get the next page of results.
-   *
-   * @throws Exception if unable to fetch next page
-   */
-  public VariantListProductVariantsResponse nextPage() throws Exception {
-    if (!hasNextPage()) {
-      throw new IllegalStateException("No more pages available");
-    }
-    if (service == null) {
-      throw new UnsupportedOperationException(
-          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
-    }
-
-    VariantListProductVariantsParams nextParams =
-        (originalParams != null
-                ? originalParams.toBuilder()
-                : VariantListProductVariantsParams.builder())
-            .offset(nextOffset)
-            .build();
-
-    return service.listProductVariants(productId, nextParams);
-  }
-
-  /** Get the raw response payload as JSON string. */
-  public String responsePayload() {
-    return httpResponse != null ? httpResponse.getBodyAsString() : null;
-  }
-
-  /** Get the HTTP status code. */
-  public int httpStatus() {
-    return httpResponse != null ? httpResponse.getStatusCode() : 0;
-  }
-
-  /** Get response headers. */
-  public java.util.Map<String, java.util.List<String>> headers() {
-    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
-  }
-
-  /** Get a specific header value. */
-  public java.util.List<String> header(String name) {
-    if (httpResponse == null) return null;
-    return httpResponse.getHeaders().entrySet().stream()
-        .filter(e -> e.getKey().equalsIgnoreCase(name))
-        .map(java.util.Map.Entry::getValue)
-        .findFirst()
-        .orElse(null);
-  }
-
-  public static class VariantListProductVariantsItem {
-
-    private Variant variant;
-
-    public Variant getVariant() {
-      return variant;
-    }
-
-    public static VariantListProductVariantsItem fromJson(String json) {
-      VariantListProductVariantsItem item = new VariantListProductVariantsItem();
-
-      String __variantJson = JsonUtil.getObject(json, "variant");
-      if (__variantJson != null) {
-        item.variant = Variant.fromJson(__variantJson);
-      }
-
-      return item;
-    }
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/variant/VariantRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/variant/VariantRetrieveResponse.java
deleted file mode 100644
index 22004822..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/variant/VariantRetrieveResponse.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.chargebee.v4.core.responses.variant;
-
-import com.chargebee.v4.core.models.variant.Variant;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for VariantRetrieve operation. Contains the response data from a single
- * resource get operation.
- */
-public final class VariantRetrieveResponse extends BaseResponse {
-  private final Variant variant;
-
-  private VariantRetrieveResponse(Variant variant, Response httpResponse) {
-    super(httpResponse);
-
-    this.variant = variant;
-  }
-
-  /** Parse JSON response into VariantRetrieveResponse object. */
-  public static VariantRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into VariantRetrieveResponse object with HTTP response. */
-  public static VariantRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      Variant variant = Variant.fromJson(JsonUtil.getObject(json, "variant"));
-
-      return new VariantRetrieveResponse(variant, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse VariantRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the variant from the response. */
-  public Variant getVariant() {
-    return variant;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountRetrieveResponse.java
deleted file mode 100644
index e761ba35..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountRetrieveResponse.java
+++ /dev/null
@@ -1,45 +0,0 @@
-package com.chargebee.v4.core.responses.virtualBankAccount;
-
-import com.chargebee.v4.core.models.virtualBankAccount.VirtualBankAccount;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for VirtualBankAccountRetrieve operation. Contains the response data
- * from a single resource get operation.
- */
-public final class VirtualBankAccountRetrieveResponse extends BaseResponse {
-  private final VirtualBankAccount virtualBankAccount;
-
-  private VirtualBankAccountRetrieveResponse(
-      VirtualBankAccount virtualBankAccount, Response httpResponse) {
-    super(httpResponse);
-
-    this.virtualBankAccount = virtualBankAccount;
-  }
-
-  /** Parse JSON response into VirtualBankAccountRetrieveResponse object. */
-  public static VirtualBankAccountRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into VirtualBankAccountRetrieveResponse object with HTTP response. */
-  public static VirtualBankAccountRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      VirtualBankAccount virtualBankAccount =
-          VirtualBankAccount.fromJson(JsonUtil.getObject(json, "virtual_bank_account"));
-
-      return new VirtualBankAccountRetrieveResponse(virtualBankAccount, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse VirtualBankAccountRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the virtualBankAccount from the response. */
-  public VirtualBankAccount getVirtualBankAccount() {
-    return virtualBankAccount;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointRetrieveResponse.java b/src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointRetrieveResponse.java
deleted file mode 100644
index cdfca2be..00000000
--- a/src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointRetrieveResponse.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.chargebee.v4.core.responses.webhookEndpoint;
-
-import com.chargebee.v4.core.models.webhookEndpoint.WebhookEndpoint;
-
-import com.chargebee.v4.core.responses.BaseResponse;
-import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.Response;
-
-/**
- * Immutable response object for WebhookEndpointRetrieve operation. Contains the response data from
- * a single resource get operation.
- */
-public final class WebhookEndpointRetrieveResponse extends BaseResponse {
-  private final WebhookEndpoint webhookEndpoint;
-
-  private WebhookEndpointRetrieveResponse(WebhookEndpoint webhookEndpoint, Response httpResponse) {
-    super(httpResponse);
-
-    this.webhookEndpoint = webhookEndpoint;
-  }
-
-  /** Parse JSON response into WebhookEndpointRetrieveResponse object. */
-  public static WebhookEndpointRetrieveResponse fromJson(String json) {
-    return fromJson(json, null);
-  }
-
-  /** Parse JSON response into WebhookEndpointRetrieveResponse object with HTTP response. */
-  public static WebhookEndpointRetrieveResponse fromJson(String json, Response httpResponse) {
-    try {
-
-      WebhookEndpoint webhookEndpoint =
-          WebhookEndpoint.fromJson(JsonUtil.getObject(json, "webhook_endpoint"));
-
-      return new WebhookEndpointRetrieveResponse(webhookEndpoint, httpResponse);
-    } catch (Exception e) {
-      throw new RuntimeException("Failed to parse WebhookEndpointRetrieveResponse from JSON", e);
-    }
-  }
-
-  /** Get the webhookEndpoint from the response. */
-  public WebhookEndpoint getWebhookEndpoint() {
-    return webhookEndpoint;
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/AddonService.java b/src/main/java/com/chargebee/v4/core/services/AddonService.java
deleted file mode 100644
index 2b6bd08f..00000000
--- a/src/main/java/com/chargebee/v4/core/services/AddonService.java
+++ /dev/null
@@ -1,194 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.addon.params.AddonCopyParams;
-
-import com.chargebee.v4.core.models.addon.params.AddonUpdateParams;
-
-import com.chargebee.v4.core.models.addon.params.AddonListParams;
-
-import com.chargebee.v4.core.models.addon.params.AddonCreateParams;
-
-import com.chargebee.v4.core.responses.addon.AddonCopyResponse;
-
-import com.chargebee.v4.core.responses.addon.AddonUnarchiveResponse;
-
-import com.chargebee.v4.core.responses.addon.AddonRetrieveResponse;
-
-import com.chargebee.v4.core.responses.addon.AddonUpdateResponse;
-
-import com.chargebee.v4.core.responses.addon.AddonListResponse;
-
-import com.chargebee.v4.core.responses.addon.AddonCreateResponse;
-
-import com.chargebee.v4.core.responses.addon.AddonDeleteResponse;
-
-public final class AddonService extends BaseService<AddonService> {
-
-  private final ServiceConfig config;
-
-  public AddonService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private AddonService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private AddonService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  AddonService with(RequestOptions newOptions) {
-    return new AddonService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public AddonService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** copy a addon using immutable params (executes immediately) - returns raw Response. */
-  Response copyRaw(AddonCopyParams params) throws Exception {
-
-    return post("/addons/copy", params != null ? params.toFormData() : null);
-  }
-
-  /** copy a addon using raw JSON payload (executes immediately) - returns raw Response. */
-  Response copyRaw(String jsonPayload) throws Exception {
-
-    return postJson("/addons/copy", jsonPayload);
-  }
-
-  public AddonCopyResponse copy(AddonCopyParams params) throws Exception {
-    Response response = copyRaw(params);
-
-    return AddonCopyResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** unarchive a addon (executes immediately) - returns raw Response. */
-  Response unarchiveRaw(String addonId) throws Exception {
-    String path = buildPathWithParams("/addons/{addon-id}/unarchive", "addon-id", addonId);
-
-    return post(path, null);
-  }
-
-  public AddonUnarchiveResponse unarchive(String addonId) throws Exception {
-    Response response = unarchiveRaw(addonId);
-    return AddonUnarchiveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a addon (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String addonId) throws Exception {
-    String path = buildPathWithParams("/addons/{addon-id}", "addon-id", addonId);
-
-    return get(path, null);
-  }
-
-  public AddonRetrieveResponse retrieve(String addonId) throws Exception {
-    Response response = retrieveRaw(addonId);
-    return AddonRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** update a addon (executes immediately) - returns raw Response. */
-  Response updateRaw(String addonId) throws Exception {
-    String path = buildPathWithParams("/addons/{addon-id}", "addon-id", addonId);
-
-    return post(path, null);
-  }
-
-  /** update a addon using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String addonId, AddonUpdateParams params) throws Exception {
-    String path = buildPathWithParams("/addons/{addon-id}", "addon-id", addonId);
-    return post(path, params.toFormData());
-  }
-
-  /** update a addon using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String addonId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/addons/{addon-id}", "addon-id", addonId);
-    return postJson(path, jsonPayload);
-  }
-
-  public AddonUpdateResponse update(String addonId, AddonUpdateParams params) throws Exception {
-    Response response = updateRaw(addonId, params);
-    return AddonUpdateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** list a addon using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(AddonListParams params) throws Exception {
-
-    return get("/addons", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a addon without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/addons", null);
-  }
-
-  /** list a addon using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public AddonListResponse list(AddonListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return AddonListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public AddonListResponse list() throws Exception {
-    Response response = listRaw();
-    return AddonListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** create a addon using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(AddonCreateParams params) throws Exception {
-
-    return post("/addons", params != null ? params.toFormData() : null);
-  }
-
-  /** create a addon using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/addons", jsonPayload);
-  }
-
-  public AddonCreateResponse create(AddonCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return AddonCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** delete a addon (executes immediately) - returns raw Response. */
-  Response deleteRaw(String addonId) throws Exception {
-    String path = buildPathWithParams("/addons/{addon-id}/delete", "addon-id", addonId);
-
-    return post(path, null);
-  }
-
-  public AddonDeleteResponse delete(String addonId) throws Exception {
-    Response response = deleteRaw(addonId);
-    return AddonDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/AttachedItemService.java b/src/main/java/com/chargebee/v4/core/services/AttachedItemService.java
deleted file mode 100644
index 5e4dafc0..00000000
--- a/src/main/java/com/chargebee/v4/core/services/AttachedItemService.java
+++ /dev/null
@@ -1,198 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.attachedItem.params.AttachedItemUpdateParams;
-
-import com.chargebee.v4.core.models.attachedItem.params.AttachedItemListParams;
-
-import com.chargebee.v4.core.models.attachedItem.params.AttachedItemCreateParams;
-
-import com.chargebee.v4.core.models.attachedItem.params.AttachedItemDeleteParams;
-
-import com.chargebee.v4.core.responses.attachedItem.AttachedItemRetrieveResponse;
-
-import com.chargebee.v4.core.responses.attachedItem.AttachedItemUpdateResponse;
-
-import com.chargebee.v4.core.responses.attachedItem.AttachedItemListResponse;
-
-import com.chargebee.v4.core.responses.attachedItem.AttachedItemCreateResponse;
-
-import com.chargebee.v4.core.responses.attachedItem.AttachedItemDeleteResponse;
-
-public final class AttachedItemService extends BaseService<AttachedItemService> {
-
-  private final ServiceConfig config;
-
-  public AttachedItemService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private AttachedItemService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private AttachedItemService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  AttachedItemService with(RequestOptions newOptions) {
-    return new AttachedItemService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public AttachedItemService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** retrieve a attachedItem (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String attachedItemId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/attached_items/{attached-item-id}", "attached-item-id", attachedItemId);
-
-    return get(path, null);
-  }
-
-  public AttachedItemRetrieveResponse retrieve(String attachedItemId) throws Exception {
-    Response response = retrieveRaw(attachedItemId);
-    return AttachedItemRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** update a attachedItem (executes immediately) - returns raw Response. */
-  Response updateRaw(String attachedItemId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/attached_items/{attached-item-id}", "attached-item-id", attachedItemId);
-
-    return post(path, null);
-  }
-
-  /** update a attachedItem using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String attachedItemId, AttachedItemUpdateParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/attached_items/{attached-item-id}", "attached-item-id", attachedItemId);
-    return post(path, params.toFormData());
-  }
-
-  /** update a attachedItem using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String attachedItemId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/attached_items/{attached-item-id}", "attached-item-id", attachedItemId);
-    return postJson(path, jsonPayload);
-  }
-
-  public AttachedItemUpdateResponse update(String attachedItemId, AttachedItemUpdateParams params)
-      throws Exception {
-    Response response = updateRaw(attachedItemId, params);
-    return AttachedItemUpdateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** list a attachedItem using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(String itemId, AttachedItemListParams params) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/attached_items", "item-id", itemId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a attachedItem without params (executes immediately) - returns raw Response. */
-  Response listRaw(String itemId) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/attached_items", "item-id", itemId);
-    return get(path, null);
-  }
-
-  /** list a attachedItem using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String itemId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/attached_items", "item-id", itemId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public AttachedItemListResponse list(String itemId, AttachedItemListParams params)
-      throws Exception {
-    Response response = listRaw(itemId, params);
-    return AttachedItemListResponse.fromJson(
-        response.getBodyAsString(), this, params, itemId, response);
-  }
-
-  public AttachedItemListResponse list(String itemId) throws Exception {
-    Response response = listRaw(itemId);
-    return AttachedItemListResponse.fromJson(
-        response.getBodyAsString(), this, null, itemId, response);
-  }
-
-  /** create a attachedItem (executes immediately) - returns raw Response. */
-  Response createRaw(String itemId) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/attached_items", "item-id", itemId);
-
-    return post(path, null);
-  }
-
-  /** create a attachedItem using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(String itemId, AttachedItemCreateParams params) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/attached_items", "item-id", itemId);
-    return post(path, params.toFormData());
-  }
-
-  /** create a attachedItem using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String itemId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/attached_items", "item-id", itemId);
-    return postJson(path, jsonPayload);
-  }
-
-  public AttachedItemCreateResponse create(String itemId, AttachedItemCreateParams params)
-      throws Exception {
-    Response response = createRaw(itemId, params);
-    return AttachedItemCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** delete a attachedItem (executes immediately) - returns raw Response. */
-  Response deleteRaw(String attachedItemId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/attached_items/{attached-item-id}/delete", "attached-item-id", attachedItemId);
-
-    return post(path, null);
-  }
-
-  /** delete a attachedItem using immutable params (executes immediately) - returns raw Response. */
-  Response deleteRaw(String attachedItemId, AttachedItemDeleteParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/attached_items/{attached-item-id}/delete", "attached-item-id", attachedItemId);
-    return post(path, params.toFormData());
-  }
-
-  /** delete a attachedItem using raw JSON payload (executes immediately) - returns raw Response. */
-  Response deleteRaw(String attachedItemId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/attached_items/{attached-item-id}/delete", "attached-item-id", attachedItemId);
-    return postJson(path, jsonPayload);
-  }
-
-  public AttachedItemDeleteResponse delete(String attachedItemId, AttachedItemDeleteParams params)
-      throws Exception {
-    Response response = deleteRaw(attachedItemId, params);
-    return AttachedItemDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/CardService.java b/src/main/java/com/chargebee/v4/core/services/CardService.java
deleted file mode 100644
index 85d1249e..00000000
--- a/src/main/java/com/chargebee/v4/core/services/CardService.java
+++ /dev/null
@@ -1,194 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.card.params.CardCopyCardForCustomerParams;
-
-import com.chargebee.v4.core.models.card.params.CardSwitchGatewayForCustomerParams;
-
-import com.chargebee.v4.core.models.card.params.CardUpdateCardForCustomerParams;
-
-import com.chargebee.v4.core.responses.card.CardCopyCardForCustomerResponse;
-
-import com.chargebee.v4.core.responses.card.CardRetrieveResponse;
-
-import com.chargebee.v4.core.responses.card.CardSwitchGatewayForCustomerResponse;
-
-import com.chargebee.v4.core.responses.card.CardDeleteCardForCustomerResponse;
-
-import com.chargebee.v4.core.responses.card.CardUpdateCardForCustomerResponse;
-
-public final class CardService extends BaseService<CardService> {
-
-  private final ServiceConfig config;
-
-  public CardService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private CardService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private CardService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  CardService with(RequestOptions newOptions) {
-    return new CardService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public CardService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** copyCardForCustomer a card (executes immediately) - returns raw Response. */
-  Response copyCardForCustomerRaw(String customerId) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/copy_card", "customer-id", customerId);
-
-    return post(path, null);
-  }
-
-  /**
-   * copyCardForCustomer a card using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response copyCardForCustomerRaw(String customerId, CardCopyCardForCustomerParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/copy_card", "customer-id", customerId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * copyCardForCustomer a card using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response copyCardForCustomerRaw(String customerId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/copy_card", "customer-id", customerId);
-    return postJson(path, jsonPayload);
-  }
-
-  public CardCopyCardForCustomerResponse copyCardForCustomer(
-      String customerId, CardCopyCardForCustomerParams params) throws Exception {
-    Response response = copyCardForCustomerRaw(customerId, params);
-    return CardCopyCardForCustomerResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a card (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String customerId) throws Exception {
-    String path = buildPathWithParams("/cards/{customer-id}", "customer-id", customerId);
-
-    return get(path, null);
-  }
-
-  public CardRetrieveResponse retrieve(String customerId) throws Exception {
-    Response response = retrieveRaw(customerId);
-    return CardRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** switchGatewayForCustomer a card (executes immediately) - returns raw Response. */
-  Response switchGatewayForCustomerRaw(String customerId) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/switch_gateway", "customer-id", customerId);
-
-    return post(path, null);
-  }
-
-  /**
-   * switchGatewayForCustomer a card using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response switchGatewayForCustomerRaw(String customerId, CardSwitchGatewayForCustomerParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/switch_gateway", "customer-id", customerId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * switchGatewayForCustomer a card using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response switchGatewayForCustomerRaw(String customerId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/switch_gateway", "customer-id", customerId);
-    return postJson(path, jsonPayload);
-  }
-
-  public CardSwitchGatewayForCustomerResponse switchGatewayForCustomer(
-      String customerId, CardSwitchGatewayForCustomerParams params) throws Exception {
-    Response response = switchGatewayForCustomerRaw(customerId, params);
-    return CardSwitchGatewayForCustomerResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** deleteCardForCustomer a card (executes immediately) - returns raw Response. */
-  Response deleteCardForCustomerRaw(String customerId) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/delete_card", "customer-id", customerId);
-
-    return post(path, null);
-  }
-
-  public CardDeleteCardForCustomerResponse deleteCardForCustomer(String customerId)
-      throws Exception {
-    Response response = deleteCardForCustomerRaw(customerId);
-    return CardDeleteCardForCustomerResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** updateCardForCustomer a card (executes immediately) - returns raw Response. */
-  Response updateCardForCustomerRaw(String customerId) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/credit_card", "customer-id", customerId);
-
-    return post(path, null);
-  }
-
-  /**
-   * updateCardForCustomer a card using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response updateCardForCustomerRaw(String customerId, CardUpdateCardForCustomerParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/credit_card", "customer-id", customerId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * updateCardForCustomer a card using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response updateCardForCustomerRaw(String customerId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/credit_card", "customer-id", customerId);
-    return postJson(path, jsonPayload);
-  }
-
-  public CardUpdateCardForCustomerResponse updateCardForCustomer(
-      String customerId, CardUpdateCardForCustomerParams params) throws Exception {
-    Response response = updateCardForCustomerRaw(customerId, params);
-    return CardUpdateCardForCustomerResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/CommentService.java b/src/main/java/com/chargebee/v4/core/services/CommentService.java
deleted file mode 100644
index c766da0f..00000000
--- a/src/main/java/com/chargebee/v4/core/services/CommentService.java
+++ /dev/null
@@ -1,130 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.comment.params.CommentListParams;
-
-import com.chargebee.v4.core.models.comment.params.CommentCreateParams;
-
-import com.chargebee.v4.core.responses.comment.CommentDeleteResponse;
-
-import com.chargebee.v4.core.responses.comment.CommentRetrieveResponse;
-
-import com.chargebee.v4.core.responses.comment.CommentListResponse;
-
-import com.chargebee.v4.core.responses.comment.CommentCreateResponse;
-
-public final class CommentService extends BaseService<CommentService> {
-
-  private final ServiceConfig config;
-
-  public CommentService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private CommentService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private CommentService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  CommentService with(RequestOptions newOptions) {
-    return new CommentService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public CommentService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** delete a comment (executes immediately) - returns raw Response. */
-  Response deleteRaw(String commentId) throws Exception {
-    String path = buildPathWithParams("/comments/{comment-id}/delete", "comment-id", commentId);
-
-    return post(path, null);
-  }
-
-  public CommentDeleteResponse delete(String commentId) throws Exception {
-    Response response = deleteRaw(commentId);
-    return CommentDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a comment (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String commentId) throws Exception {
-    String path = buildPathWithParams("/comments/{comment-id}", "comment-id", commentId);
-
-    return get(path, null);
-  }
-
-  public CommentRetrieveResponse retrieve(String commentId) throws Exception {
-    Response response = retrieveRaw(commentId);
-    return CommentRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** list a comment using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(CommentListParams params) throws Exception {
-
-    return get("/comments", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a comment without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/comments", null);
-  }
-
-  /** list a comment using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public CommentListResponse list(CommentListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return CommentListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public CommentListResponse list() throws Exception {
-    Response response = listRaw();
-    return CommentListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** create a comment using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(CommentCreateParams params) throws Exception {
-
-    return post("/comments", params != null ? params.toFormData() : null);
-  }
-
-  /** create a comment using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/comments", jsonPayload);
-  }
-
-  public CommentCreateResponse create(CommentCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return CommentCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/CouponCodeService.java b/src/main/java/com/chargebee/v4/core/services/CouponCodeService.java
deleted file mode 100644
index 4af5ca63..00000000
--- a/src/main/java/com/chargebee/v4/core/services/CouponCodeService.java
+++ /dev/null
@@ -1,133 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.couponCode.params.CouponCodeListParams;
-
-import com.chargebee.v4.core.models.couponCode.params.CouponCodeCreateParams;
-
-import com.chargebee.v4.core.responses.couponCode.CouponCodeListResponse;
-
-import com.chargebee.v4.core.responses.couponCode.CouponCodeCreateResponse;
-
-import com.chargebee.v4.core.responses.couponCode.CouponCodeRetrieveResponse;
-
-import com.chargebee.v4.core.responses.couponCode.CouponCodeArchiveResponse;
-
-public final class CouponCodeService extends BaseService<CouponCodeService> {
-
-  private final ServiceConfig config;
-
-  public CouponCodeService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private CouponCodeService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private CouponCodeService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  CouponCodeService with(RequestOptions newOptions) {
-    return new CouponCodeService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public CouponCodeService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** list a couponCode using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(CouponCodeListParams params) throws Exception {
-
-    return get("/coupon_codes", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a couponCode without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/coupon_codes", null);
-  }
-
-  /** list a couponCode using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public CouponCodeListResponse list(CouponCodeListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return CouponCodeListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public CouponCodeListResponse list() throws Exception {
-    Response response = listRaw();
-    return CouponCodeListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** create a couponCode using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(CouponCodeCreateParams params) throws Exception {
-
-    return post("/coupon_codes", params != null ? params.toFormData() : null);
-  }
-
-  /** create a couponCode using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/coupon_codes", jsonPayload);
-  }
-
-  public CouponCodeCreateResponse create(CouponCodeCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return CouponCodeCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a couponCode (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String couponCodeCode) throws Exception {
-    String path =
-        buildPathWithParams("/coupon_codes/{coupon-code-code}", "coupon-code-code", couponCodeCode);
-
-    return get(path, null);
-  }
-
-  public CouponCodeRetrieveResponse retrieve(String couponCodeCode) throws Exception {
-    Response response = retrieveRaw(couponCodeCode);
-    return CouponCodeRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** archive a couponCode (executes immediately) - returns raw Response. */
-  Response archiveRaw(String couponCodeCode) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/coupon_codes/{coupon-code-code}/archive", "coupon-code-code", couponCodeCode);
-
-    return post(path, null);
-  }
-
-  public CouponCodeArchiveResponse archive(String couponCodeCode) throws Exception {
-    Response response = archiveRaw(couponCodeCode);
-    return CouponCodeArchiveResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/CouponService.java b/src/main/java/com/chargebee/v4/core/services/CouponService.java
deleted file mode 100644
index 8dfba009..00000000
--- a/src/main/java/com/chargebee/v4/core/services/CouponService.java
+++ /dev/null
@@ -1,257 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.coupon.params.CouponListParams;
-
-import com.chargebee.v4.core.models.coupon.params.CouponCreateParams;
-
-import com.chargebee.v4.core.models.coupon.params.CouponUpdateForItemsParams;
-
-import com.chargebee.v4.core.models.coupon.params.CouponCopyParams;
-
-import com.chargebee.v4.core.models.coupon.params.CouponUpdateParams;
-
-import com.chargebee.v4.core.models.coupon.params.CouponCreateForItemsParams;
-
-import com.chargebee.v4.core.responses.coupon.CouponListResponse;
-
-import com.chargebee.v4.core.responses.coupon.CouponCreateResponse;
-
-import com.chargebee.v4.core.responses.coupon.CouponUpdateForItemsResponse;
-
-import com.chargebee.v4.core.responses.coupon.CouponUnarchiveResponse;
-
-import com.chargebee.v4.core.responses.coupon.CouponDeleteResponse;
-
-import com.chargebee.v4.core.responses.coupon.CouponCopyResponse;
-
-import com.chargebee.v4.core.responses.coupon.CouponRetrieveResponse;
-
-import com.chargebee.v4.core.responses.coupon.CouponUpdateResponse;
-
-import com.chargebee.v4.core.responses.coupon.CouponCreateForItemsResponse;
-
-public final class CouponService extends BaseService<CouponService> {
-
-  private final ServiceConfig config;
-
-  public CouponService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private CouponService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private CouponService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  CouponService with(RequestOptions newOptions) {
-    return new CouponService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public CouponService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** list a coupon using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(CouponListParams params) throws Exception {
-
-    return get("/coupons", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a coupon without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/coupons", null);
-  }
-
-  /** list a coupon using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public CouponListResponse list(CouponListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return CouponListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public CouponListResponse list() throws Exception {
-    Response response = listRaw();
-    return CouponListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** create a coupon using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(CouponCreateParams params) throws Exception {
-
-    return post("/coupons", params != null ? params.toFormData() : null);
-  }
-
-  /** create a coupon using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/coupons", jsonPayload);
-  }
-
-  public CouponCreateResponse create(CouponCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return CouponCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** updateForItems a coupon (executes immediately) - returns raw Response. */
-  Response updateForItemsRaw(String couponId) throws Exception {
-    String path =
-        buildPathWithParams("/coupons/{coupon-id}/update_for_items", "coupon-id", couponId);
-
-    return post(path, null);
-  }
-
-  /**
-   * updateForItems a coupon using immutable params (executes immediately) - returns raw Response.
-   */
-  Response updateForItemsRaw(String couponId, CouponUpdateForItemsParams params) throws Exception {
-    String path =
-        buildPathWithParams("/coupons/{coupon-id}/update_for_items", "coupon-id", couponId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * updateForItems a coupon using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response updateForItemsRaw(String couponId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/coupons/{coupon-id}/update_for_items", "coupon-id", couponId);
-    return postJson(path, jsonPayload);
-  }
-
-  public CouponUpdateForItemsResponse updateForItems(
-      String couponId, CouponUpdateForItemsParams params) throws Exception {
-    Response response = updateForItemsRaw(couponId, params);
-    return CouponUpdateForItemsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** unarchive a coupon (executes immediately) - returns raw Response. */
-  Response unarchiveRaw(String couponId) throws Exception {
-    String path = buildPathWithParams("/coupons/{coupon-id}/unarchive", "coupon-id", couponId);
-
-    return post(path, null);
-  }
-
-  public CouponUnarchiveResponse unarchive(String couponId) throws Exception {
-    Response response = unarchiveRaw(couponId);
-    return CouponUnarchiveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** delete a coupon (executes immediately) - returns raw Response. */
-  Response deleteRaw(String couponId) throws Exception {
-    String path = buildPathWithParams("/coupons/{coupon-id}/delete", "coupon-id", couponId);
-
-    return post(path, null);
-  }
-
-  public CouponDeleteResponse delete(String couponId) throws Exception {
-    Response response = deleteRaw(couponId);
-    return CouponDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** copy a coupon using immutable params (executes immediately) - returns raw Response. */
-  Response copyRaw(CouponCopyParams params) throws Exception {
-
-    return post("/coupons/copy", params != null ? params.toFormData() : null);
-  }
-
-  /** copy a coupon using raw JSON payload (executes immediately) - returns raw Response. */
-  Response copyRaw(String jsonPayload) throws Exception {
-
-    return postJson("/coupons/copy", jsonPayload);
-  }
-
-  public CouponCopyResponse copy(CouponCopyParams params) throws Exception {
-    Response response = copyRaw(params);
-
-    return CouponCopyResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a coupon (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String couponId) throws Exception {
-    String path = buildPathWithParams("/coupons/{coupon-id}", "coupon-id", couponId);
-
-    return get(path, null);
-  }
-
-  public CouponRetrieveResponse retrieve(String couponId) throws Exception {
-    Response response = retrieveRaw(couponId);
-    return CouponRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** update a coupon (executes immediately) - returns raw Response. */
-  Response updateRaw(String couponId) throws Exception {
-    String path = buildPathWithParams("/coupons/{coupon-id}", "coupon-id", couponId);
-
-    return post(path, null);
-  }
-
-  /** update a coupon using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String couponId, CouponUpdateParams params) throws Exception {
-    String path = buildPathWithParams("/coupons/{coupon-id}", "coupon-id", couponId);
-    return post(path, params.toFormData());
-  }
-
-  /** update a coupon using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String couponId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/coupons/{coupon-id}", "coupon-id", couponId);
-    return postJson(path, jsonPayload);
-  }
-
-  public CouponUpdateResponse update(String couponId, CouponUpdateParams params) throws Exception {
-    Response response = updateRaw(couponId, params);
-    return CouponUpdateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createForItems a coupon using immutable params (executes immediately) - returns raw Response.
-   */
-  Response createForItemsRaw(CouponCreateForItemsParams params) throws Exception {
-
-    return post("/coupons/create_for_items", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createForItems a coupon using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response createForItemsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/coupons/create_for_items", jsonPayload);
-  }
-
-  public CouponCreateForItemsResponse createForItems(CouponCreateForItemsParams params)
-      throws Exception {
-    Response response = createForItemsRaw(params);
-
-    return CouponCreateForItemsResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/CreditNoteService.java b/src/main/java/com/chargebee/v4/core/services/CreditNoteService.java
deleted file mode 100644
index 7eb9de23..00000000
--- a/src/main/java/com/chargebee/v4/core/services/CreditNoteService.java
+++ /dev/null
@@ -1,472 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.creditNote.params.CreditNoteVoidCreditNoteParams;
-
-import com.chargebee.v4.core.models.creditNote.params.CreditNoteRefundParams;
-
-import com.chargebee.v4.core.models.creditNote.params.CreditNoteListParams;
-
-import com.chargebee.v4.core.models.creditNote.params.CreditNoteCreateParams;
-
-import com.chargebee.v4.core.models.creditNote.params.CreditNoteRecordRefundParams;
-
-import com.chargebee.v4.core.models.creditNote.params.CreditNoteImportCreditNoteParams;
-
-import com.chargebee.v4.core.models.creditNote.params.CreditNoteDeleteParams;
-
-import com.chargebee.v4.core.models.creditNote.params.CreditNoteCreditNotesForCustomerParams;
-
-import com.chargebee.v4.core.models.creditNote.params.CreditNotePdfParams;
-
-import com.chargebee.v4.core.models.creditNote.params.CreditNoteRemoveTaxWithheldRefundParams;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNoteVoidCreditNoteResponse;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNoteRefundResponse;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNoteListResponse;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNoteCreateResponse;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNoteRecordRefundResponse;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNoteImportCreditNoteResponse;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNoteDeleteResponse;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNoteCreditNotesForCustomerResponse;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNoteDownloadEinvoiceResponse;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNotePdfResponse;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNoteResendEinvoiceResponse;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNoteRemoveTaxWithheldRefundResponse;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNoteRetrieveResponse;
-
-import com.chargebee.v4.core.responses.creditNote.CreditNoteSendEinvoiceResponse;
-
-public final class CreditNoteService extends BaseService<CreditNoteService> {
-
-  private final ServiceConfig config;
-
-  public CreditNoteService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private CreditNoteService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private CreditNoteService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  CreditNoteService with(RequestOptions newOptions) {
-    return new CreditNoteService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public CreditNoteService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** voidCreditNote a creditNote (executes immediately) - returns raw Response. */
-  Response voidCreditNoteRaw(String creditNoteId) throws Exception {
-    String path =
-        buildPathWithParams("/credit_notes/{credit-note-id}/void", "credit-note-id", creditNoteId);
-
-    return post(path, null);
-  }
-
-  /**
-   * voidCreditNote a creditNote using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response voidCreditNoteRaw(String creditNoteId, CreditNoteVoidCreditNoteParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/credit_notes/{credit-note-id}/void", "credit-note-id", creditNoteId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * voidCreditNote a creditNote using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response voidCreditNoteRaw(String creditNoteId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/credit_notes/{credit-note-id}/void", "credit-note-id", creditNoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public CreditNoteVoidCreditNoteResponse voidCreditNote(
-      String creditNoteId, CreditNoteVoidCreditNoteParams params) throws Exception {
-    Response response = voidCreditNoteRaw(creditNoteId, params);
-    return CreditNoteVoidCreditNoteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** refund a creditNote (executes immediately) - returns raw Response. */
-  Response refundRaw(String creditNoteId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/refund", "credit-note-id", creditNoteId);
-
-    return post(path, null);
-  }
-
-  /** refund a creditNote using immutable params (executes immediately) - returns raw Response. */
-  Response refundRaw(String creditNoteId, CreditNoteRefundParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/refund", "credit-note-id", creditNoteId);
-    return post(path, params.toFormData());
-  }
-
-  /** refund a creditNote using raw JSON payload (executes immediately) - returns raw Response. */
-  Response refundRaw(String creditNoteId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/refund", "credit-note-id", creditNoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public CreditNoteRefundResponse refund(String creditNoteId, CreditNoteRefundParams params)
-      throws Exception {
-    Response response = refundRaw(creditNoteId, params);
-    return CreditNoteRefundResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** list a creditNote using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(CreditNoteListParams params) throws Exception {
-
-    return get("/credit_notes", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a creditNote without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/credit_notes", null);
-  }
-
-  /** list a creditNote using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public CreditNoteListResponse list(CreditNoteListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return CreditNoteListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public CreditNoteListResponse list() throws Exception {
-    Response response = listRaw();
-    return CreditNoteListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** create a creditNote using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(CreditNoteCreateParams params) throws Exception {
-
-    return post("/credit_notes", params != null ? params.toFormData() : null);
-  }
-
-  /** create a creditNote using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/credit_notes", jsonPayload);
-  }
-
-  public CreditNoteCreateResponse create(CreditNoteCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return CreditNoteCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** recordRefund a creditNote (executes immediately) - returns raw Response. */
-  Response recordRefundRaw(String creditNoteId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/record_refund", "credit-note-id", creditNoteId);
-
-    return post(path, null);
-  }
-
-  /**
-   * recordRefund a creditNote using immutable params (executes immediately) - returns raw Response.
-   */
-  Response recordRefundRaw(String creditNoteId, CreditNoteRecordRefundParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/record_refund", "credit-note-id", creditNoteId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * recordRefund a creditNote using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response recordRefundRaw(String creditNoteId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/record_refund", "credit-note-id", creditNoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public CreditNoteRecordRefundResponse recordRefund(
-      String creditNoteId, CreditNoteRecordRefundParams params) throws Exception {
-    Response response = recordRefundRaw(creditNoteId, params);
-    return CreditNoteRecordRefundResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * importCreditNote a creditNote using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response importCreditNoteRaw(CreditNoteImportCreditNoteParams params) throws Exception {
-
-    return post("/credit_notes/import_credit_note", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * importCreditNote a creditNote using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response importCreditNoteRaw(String jsonPayload) throws Exception {
-
-    return postJson("/credit_notes/import_credit_note", jsonPayload);
-  }
-
-  public CreditNoteImportCreditNoteResponse importCreditNote(
-      CreditNoteImportCreditNoteParams params) throws Exception {
-    Response response = importCreditNoteRaw(params);
-
-    return CreditNoteImportCreditNoteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** delete a creditNote (executes immediately) - returns raw Response. */
-  Response deleteRaw(String creditNoteId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/delete", "credit-note-id", creditNoteId);
-
-    return post(path, null);
-  }
-
-  /** delete a creditNote using immutable params (executes immediately) - returns raw Response. */
-  Response deleteRaw(String creditNoteId, CreditNoteDeleteParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/delete", "credit-note-id", creditNoteId);
-    return post(path, params.toFormData());
-  }
-
-  /** delete a creditNote using raw JSON payload (executes immediately) - returns raw Response. */
-  Response deleteRaw(String creditNoteId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/delete", "credit-note-id", creditNoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public CreditNoteDeleteResponse delete(String creditNoteId, CreditNoteDeleteParams params)
-      throws Exception {
-    Response response = deleteRaw(creditNoteId, params);
-    return CreditNoteDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * creditNotesForCustomer a creditNote using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response creditNotesForCustomerRaw(
-      String customerId, CreditNoteCreditNotesForCustomerParams params) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/credit_notes", "customer-id", customerId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * creditNotesForCustomer a creditNote without params (executes immediately) - returns raw
-   * Response.
-   */
-  Response creditNotesForCustomerRaw(String customerId) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/credit_notes", "customer-id", customerId);
-    return get(path, null);
-  }
-
-  /**
-   * creditNotesForCustomer a creditNote using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response creditNotesForCustomerRaw(String customerId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/credit_notes", "customer-id", customerId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public CreditNoteCreditNotesForCustomerResponse creditNotesForCustomer(
-      String customerId, CreditNoteCreditNotesForCustomerParams params) throws Exception {
-    Response response = creditNotesForCustomerRaw(customerId, params);
-    return CreditNoteCreditNotesForCustomerResponse.fromJson(
-        response.getBodyAsString(), this, params, customerId, response);
-  }
-
-  public CreditNoteCreditNotesForCustomerResponse creditNotesForCustomer(String customerId)
-      throws Exception {
-    Response response = creditNotesForCustomerRaw(customerId);
-    return CreditNoteCreditNotesForCustomerResponse.fromJson(
-        response.getBodyAsString(), this, null, customerId, response);
-  }
-
-  /** downloadEinvoice a creditNote (executes immediately) - returns raw Response. */
-  Response downloadEinvoiceRaw(String creditNoteId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/download_einvoice", "credit-note-id", creditNoteId);
-
-    return get(path, null);
-  }
-
-  public CreditNoteDownloadEinvoiceResponse downloadEinvoice(String creditNoteId) throws Exception {
-    Response response = downloadEinvoiceRaw(creditNoteId);
-    return CreditNoteDownloadEinvoiceResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** pdf a creditNote (executes immediately) - returns raw Response. */
-  Response pdfRaw(String creditNoteId) throws Exception {
-    String path =
-        buildPathWithParams("/credit_notes/{credit-note-id}/pdf", "credit-note-id", creditNoteId);
-
-    return post(path, null);
-  }
-
-  /** pdf a creditNote using immutable params (executes immediately) - returns raw Response. */
-  Response pdfRaw(String creditNoteId, CreditNotePdfParams params) throws Exception {
-    String path =
-        buildPathWithParams("/credit_notes/{credit-note-id}/pdf", "credit-note-id", creditNoteId);
-    return post(path, params.toFormData());
-  }
-
-  /** pdf a creditNote using raw JSON payload (executes immediately) - returns raw Response. */
-  Response pdfRaw(String creditNoteId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/credit_notes/{credit-note-id}/pdf", "credit-note-id", creditNoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public CreditNotePdfResponse pdf(String creditNoteId, CreditNotePdfParams params)
-      throws Exception {
-    Response response = pdfRaw(creditNoteId, params);
-    return CreditNotePdfResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** resendEinvoice a creditNote (executes immediately) - returns raw Response. */
-  Response resendEinvoiceRaw(String creditNoteId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/resend_einvoice", "credit-note-id", creditNoteId);
-
-    return post(path, null);
-  }
-
-  public CreditNoteResendEinvoiceResponse resendEinvoice(String creditNoteId) throws Exception {
-    Response response = resendEinvoiceRaw(creditNoteId);
-    return CreditNoteResendEinvoiceResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** removeTaxWithheldRefund a creditNote (executes immediately) - returns raw Response. */
-  Response removeTaxWithheldRefundRaw(String creditNoteId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/remove_tax_withheld_refund",
-            "credit-note-id",
-            creditNoteId);
-
-    return post(path, null);
-  }
-
-  /**
-   * removeTaxWithheldRefund a creditNote using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response removeTaxWithheldRefundRaw(
-      String creditNoteId, CreditNoteRemoveTaxWithheldRefundParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/remove_tax_withheld_refund",
-            "credit-note-id",
-            creditNoteId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * removeTaxWithheldRefund a creditNote using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response removeTaxWithheldRefundRaw(String creditNoteId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/remove_tax_withheld_refund",
-            "credit-note-id",
-            creditNoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public CreditNoteRemoveTaxWithheldRefundResponse removeTaxWithheldRefund(
-      String creditNoteId, CreditNoteRemoveTaxWithheldRefundParams params) throws Exception {
-    Response response = removeTaxWithheldRefundRaw(creditNoteId, params);
-    return CreditNoteRemoveTaxWithheldRefundResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a creditNote (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String creditNoteId) throws Exception {
-    String path =
-        buildPathWithParams("/credit_notes/{credit-note-id}", "credit-note-id", creditNoteId);
-
-    return get(path, null);
-  }
-
-  public CreditNoteRetrieveResponse retrieve(String creditNoteId) throws Exception {
-    Response response = retrieveRaw(creditNoteId);
-    return CreditNoteRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** sendEinvoice a creditNote (executes immediately) - returns raw Response. */
-  Response sendEinvoiceRaw(String creditNoteId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/credit_notes/{credit-note-id}/send_einvoice", "credit-note-id", creditNoteId);
-
-    return post(path, null);
-  }
-
-  public CreditNoteSendEinvoiceResponse sendEinvoice(String creditNoteId) throws Exception {
-    Response response = sendEinvoiceRaw(creditNoteId);
-    return CreditNoteSendEinvoiceResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/CustomerService_old.java b/src/main/java/com/chargebee/v4/core/services/CustomerService_old.java
deleted file mode 100644
index 684fbc53..00000000
--- a/src/main/java/com/chargebee/v4/core/services/CustomerService_old.java
+++ /dev/null
@@ -1,284 +0,0 @@
-//package com.chargebee.v4.core.services;
-//
-//
-//import com.chargebee.v4.client.ChargebeeClient;
-//import com.chargebee.v4.client.request.RequestOptions;
-//import com.chargebee.core.http.ChargebeeApiResponse;
-//import com.chargebee.core.models.customer.Customer;
-//import com.chargebee.core.models.customer.CustomerList;
-//import com.chargebee.core.models.customer.builder.CustomerCreateBuilder;
-//import com.chargebee.core.models.customer.builder.CustomerCreateBuilderRaw;
-//import com.chargebee.core.models.customer.builder.CustomerListBuilder;
-//import com.chargebee.core.models.customer.builder.CustomerListBuilderRaw;
-//import com.chargebee.core.models.customer.params.CustomerCreateParams;
-//import com.chargebee.core.models.customer.params.CustomerListParams;
-//import com.chargebee.v4.internal.JsonUtil;
-//import com.chargebee.v4.transport.Response;
-//
-//import java.util.concurrent.CompletableFuture;
-//
-///**
-// * Customer service for fluent API access.
-// * Provides both quick-start fluent builders and params-based methods.
-// */
-//public final class CustomerService_old extends BaseService<CustomerService_old> {
-//
-//    private final ServiceConfig config;
-//
-//    public CustomerService_old(ChargebeeClient client) {
-//        super(client);
-//        this.config = ServiceConfig.defaultConfig();
-//    }
-//
-//    private CustomerService_old(ChargebeeClient client, RequestOptions options) {
-//        super(client, options);
-//        this.config = ServiceConfig.defaultConfig();
-//    }
-//
-//    private CustomerService_old(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-//        super(client, options);
-//        this.config = config;
-//    }
-//
-//    @Override
-//    CustomerService_old with(RequestOptions newOptions) {
-//        return new CustomerService_old(client, newOptions, config);
-//    }
-//
-//    private RawApi rawApiInstance;
-//
-//    /**
-//     * Access methods that return raw responses (ChargebeeApiResponse).
-//     */
-//    public RawApi withRawResponse() {
-//        if (this.rawApiInstance == null) {
-//            this.rawApiInstance = new RawApi(this);
-//        }
-//        return this.rawApiInstance;
-//    }
-//
-//    /**
-//     * Start building a customer creation request.
-//     * For reusable params, prefer {@link #create(CustomerCreateParams)}.
-//     */
-//    public CustomerCreateBuilder create() {
-//        return new CustomerCreateBuilder(this);
-//    }
-//
-//    /**
-//     * Create a customer using immutable params (executes immediately) - returns raw Response.
-//     */
-//    Response createRaw(CustomerCreateParams params) throws Exception {
-//        return post("/customers", params.toFormData());
-//    }
-//
-//    /**
-//     * Create a customer using raw JSON payload (executes immediately) - returns raw Response.
-//     */
-//    Response createRaw(String jsonPayload) throws Exception {
-//        return postJson("/customers", jsonPayload);
-//    }
-//
-//    public Customer create(CustomerCreateParams params) throws Exception {
-//        Response response = createRaw(params);
-//        return parseCustomerFromResponse(response);
-//    }
-//
-//    /**
-//     * Create a customer using immutable params asynchronously - returns raw Response.
-//     */
-//    CompletableFuture<Response> createRawAsync(CustomerCreateParams params) {
-//        return postAsync("/customers", params.toFormData());
-//    }
-//
-//    /**
-//     * Create a customer using raw JSON payload asynchronously - returns raw Response.
-//     */
-//    CompletableFuture<Response> createRawAsync(String jsonPayload) {
-//        return postJsonAsync("/customers", jsonPayload);
-//    }
-//
-//    /**
-//     * Start building a customer list request.
-//     * For reusable params, prefer {@link #list(CustomerListParams)}.
-//     */
-//    public CustomerListBuilder list() {
-//        return new CustomerListBuilder(this);
-//    }
-//
-//    /**
-//     * List customers using immutable params (executes immediately) - returns raw Response.
-//     */
-//    public Response listRaw(CustomerListParams params) throws Exception {
-//        return get("/customers", params.toQueryParams());
-//    }
-//
-//    /**
-//     * List customers using immutable params asynchronously - returns raw Response.
-//     */
-//    CompletableFuture<Response> listRawAsync(CustomerListParams params) {
-//        return getAsync("/customers", params.toQueryParams());
-//    }
-//
-//    // === Fluent Response API ===
-//
-//    /**
-//     * Create a customer and return a fluent Customer object.
-//     */
-//
-//
-//    /**
-//     * Create a customer with JSON payload and return a fluent Customer object.
-//     */
-//    public Customer create(String jsonPayload) throws Exception {
-//        Response response = createRaw(jsonPayload);
-//        return parseCustomerFromResponse(response);
-//    }
-//
-//    /**
-//     * Create a customer asynchronously and return a fluent Customer object.
-//     */
-//    public CompletableFuture<Customer> createAsync(CustomerCreateParams params) {
-//        return createRawAsync(params).thenApply(this::parseCustomerFromResponse);
-//    }
-//
-//    /**
-//     * Create a customer with JSON payload asynchronously and return a fluent Customer object.
-//     */
-//    public CompletableFuture<Customer> createAsync(String jsonPayload) {
-//        return createRawAsync(jsonPayload).thenApply(this::parseCustomerFromResponse);
-//    }
-//
-//
-//
-//    /**
-//     * List all customers and return a fluent CustomerList with pagination support.
-//     */
-//    public CustomerList listAll() throws Exception {
-//        CustomerListParams params = CustomerListParams.builder().build();
-//        return list(params);
-//    }
-//
-//    /**
-//     * List customers with params and return a fluent CustomerList with pagination support.
-//     */
-//    public CustomerList list(CustomerListParams params) throws Exception {
-//        Response response = listRaw(params);
-//        return new CustomerList(this, params, response, false);
-//    }
-//
-//
-//
-//    /**
-//     * List all customers asynchronously and return a fluent CustomerList with pagination support.
-//     */
-//    public CompletableFuture<CustomerList> listAllAsync() {
-//        CustomerListParams params = CustomerListParams.builder().build();
-//        return listAsync(params);
-//    }
-//
-//    /**
-//     * List customers with params asynchronously and return a fluent CustomerList with pagination support.
-//     */
-//    public CompletableFuture<CustomerList> listAsync(CustomerListParams params) {
-//        return listRawAsync(params).thenApply(response -> {
-//            try {
-//                return new CustomerList(this, params, response, false);
-//            } catch (Exception e) {
-//                throw new RuntimeException("Failed to parse customer list response", e);
-//            }
-//        });
-//    }
-//
-//
-//
-//    // === Helper Methods ===
-//
-//    private Customer parseCustomerFromResponse(Response response) {
-//        try {
-//            String json = response.getBodyAsString();
-//
-//            // Try parsing as wrapped format first: {"customer": {...}}
-//            String customerJson = JsonUtil.getObject(json, "customer");
-//            if (customerJson != null) {
-//                return Customer.fromJson(customerJson);
-//            }
-//
-//            // Fallback to direct format for testing: {"id": "...", "first_name": "..."}
-//            if (JsonUtil.hasValue(json, "id")) {
-//                return Customer.fromJson(json);
-//            }
-//
-//            throw new IllegalStateException("Response does not contain customer data");
-//        } catch (Exception e) {
-//            throw new RuntimeException("Failed to parse customer from response", e);
-//        }
-//    }
-//
-//    /**
-//     * API methods that return raw responses, including status code and headers.
-//     */
-//    public class RawApi {
-//        private final CustomerService_old service;
-//
-//        RawApi(CustomerService_old service) {
-//            this.service = service;
-//        }
-//
-//        /**
-//         * Start building a customer creation request that will return a raw response.
-//         */
-//        public CustomerCreateBuilderRaw create() {
-//            return new CustomerCreateBuilderRaw(this);
-//        }
-//
-//        /**
-//         * Create a customer and return a raw response object.
-//         */
-//        public ChargebeeApiResponse<Customer> create(CustomerCreateParams params) throws Exception {
-//            Response response = service.createRaw(params);
-//            Customer customer = service.parseCustomerFromResponse(response);
-//            return new ChargebeeApiResponse<>(response, customer);
-//        }
-//
-//        /**
-//         * Create a customer asynchronously and return a raw response object.
-//         */
-//        public CompletableFuture<ChargebeeApiResponse<Customer>> createAsync(CustomerCreateParams params) {
-//            return service.createRawAsync(params).thenApply(response -> {
-//                Customer customer = service.parseCustomerFromResponse(response);
-//                return new ChargebeeApiResponse<>(response, customer);
-//            });
-//        }
-//
-//        /**
-//         * Start building a customer list request that will return a raw response.
-//         */
-//        public CustomerListBuilderRaw list() {
-//            return new CustomerListBuilderRaw(this);
-//        }
-//
-//        /**
-//         * List customers and return a raw response object.
-//         */
-//        public ChargebeeApiResponse<CustomerList> list(CustomerListParams params) throws Exception {
-//            Response response = service.listRaw(params);
-//            CustomerList customerList = new CustomerList(service, params, response, false);
-//            return new ChargebeeApiResponse<>(response, customerList);
-//        }
-//
-//        /**
-//         * List customers asynchronously and return a raw response object.
-//         */
-//        public CompletableFuture<ChargebeeApiResponse<CustomerList>> listAsync(CustomerListParams params) {
-//            return service.listRawAsync(params).thenApply(response -> {
-//                try {
-//                    CustomerList customerList = new CustomerList(service, params, response, false);
-//                    return new ChargebeeApiResponse<>(response, customerList);
-//                } catch (Exception e) {
-//                    throw new RuntimeException(e);
-//                }
-//            });
-//        }
-//    }
-//}
\ No newline at end of file
diff --git a/src/main/java/com/chargebee/v4/core/services/DifferentialPriceService.java b/src/main/java/com/chargebee/v4/core/services/DifferentialPriceService.java
deleted file mode 100644
index bcbb5df4..00000000
--- a/src/main/java/com/chargebee/v4/core/services/DifferentialPriceService.java
+++ /dev/null
@@ -1,241 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.differentialPrice.params.DifferentialPriceDeleteParams;
-
-import com.chargebee.v4.core.models.differentialPrice.params.DifferentialPriceCreateParams;
-
-import com.chargebee.v4.core.models.differentialPrice.params.DifferentialPriceListParams;
-
-import com.chargebee.v4.core.models.differentialPrice.params.DifferentialPriceUpdateParams;
-
-import com.chargebee.v4.core.responses.differentialPrice.DifferentialPriceDeleteResponse;
-
-import com.chargebee.v4.core.responses.differentialPrice.DifferentialPriceCreateResponse;
-
-import com.chargebee.v4.core.responses.differentialPrice.DifferentialPriceListResponse;
-
-import com.chargebee.v4.core.responses.differentialPrice.DifferentialPriceRetrieveResponse;
-
-import com.chargebee.v4.core.responses.differentialPrice.DifferentialPriceUpdateResponse;
-
-public final class DifferentialPriceService extends BaseService<DifferentialPriceService> {
-
-  private final ServiceConfig config;
-
-  public DifferentialPriceService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private DifferentialPriceService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private DifferentialPriceService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  DifferentialPriceService with(RequestOptions newOptions) {
-    return new DifferentialPriceService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public DifferentialPriceService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** delete a differentialPrice (executes immediately) - returns raw Response. */
-  Response deleteRaw(String differentialPriceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/differential_prices/{differential-price-id}/delete",
-            "differential-price-id",
-            differentialPriceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * delete a differentialPrice using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response deleteRaw(String differentialPriceId, DifferentialPriceDeleteParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/differential_prices/{differential-price-id}/delete",
-            "differential-price-id",
-            differentialPriceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * delete a differentialPrice using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response deleteRaw(String differentialPriceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/differential_prices/{differential-price-id}/delete",
-            "differential-price-id",
-            differentialPriceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public DifferentialPriceDeleteResponse delete(
-      String differentialPriceId, DifferentialPriceDeleteParams params) throws Exception {
-    Response response = deleteRaw(differentialPriceId, params);
-    return DifferentialPriceDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** create a differentialPrice (executes immediately) - returns raw Response. */
-  Response createRaw(String itemPriceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/item_prices/{item-price-id}/differential_prices", "item-price-id", itemPriceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * create a differentialPrice using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createRaw(String itemPriceId, DifferentialPriceCreateParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/item_prices/{item-price-id}/differential_prices", "item-price-id", itemPriceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * create a differentialPrice using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createRaw(String itemPriceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/item_prices/{item-price-id}/differential_prices", "item-price-id", itemPriceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public DifferentialPriceCreateResponse create(
-      String itemPriceId, DifferentialPriceCreateParams params) throws Exception {
-    Response response = createRaw(itemPriceId, params);
-    return DifferentialPriceCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * list a differentialPrice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response listRaw(DifferentialPriceListParams params) throws Exception {
-
-    return get("/differential_prices", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a differentialPrice without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/differential_prices", null);
-  }
-
-  /**
-   * list a differentialPrice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public DifferentialPriceListResponse list(DifferentialPriceListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return DifferentialPriceListResponse.fromJson(
-        response.getBodyAsString(), this, params, response);
-  }
-
-  public DifferentialPriceListResponse list() throws Exception {
-    Response response = listRaw();
-    return DifferentialPriceListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** retrieve a differentialPrice (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String differentialPriceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/differential_prices/{differential-price-id}",
-            "differential-price-id",
-            differentialPriceId);
-
-    return get(path, null);
-  }
-
-  public DifferentialPriceRetrieveResponse retrieve(String differentialPriceId) throws Exception {
-    Response response = retrieveRaw(differentialPriceId);
-    return DifferentialPriceRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** update a differentialPrice (executes immediately) - returns raw Response. */
-  Response updateRaw(String differentialPriceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/differential_prices/{differential-price-id}",
-            "differential-price-id",
-            differentialPriceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * update a differentialPrice using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response updateRaw(String differentialPriceId, DifferentialPriceUpdateParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/differential_prices/{differential-price-id}",
-            "differential-price-id",
-            differentialPriceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * update a differentialPrice using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response updateRaw(String differentialPriceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/differential_prices/{differential-price-id}",
-            "differential-price-id",
-            differentialPriceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public DifferentialPriceUpdateResponse update(
-      String differentialPriceId, DifferentialPriceUpdateParams params) throws Exception {
-    Response response = updateRaw(differentialPriceId, params);
-    return DifferentialPriceUpdateResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/EntitlementOverrideService.java b/src/main/java/com/chargebee/v4/core/services/EntitlementOverrideService.java
deleted file mode 100644
index 55ccedc8..00000000
--- a/src/main/java/com/chargebee/v4/core/services/EntitlementOverrideService.java
+++ /dev/null
@@ -1,168 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.entitlementOverride.params.EntitlementOverrideListEntitlementOverrideForSubscriptionParams;
-
-import com.chargebee.v4.core.models.entitlementOverride.params.EntitlementOverrideAddEntitlementOverrideForSubscriptionParams;
-
-import com.chargebee.v4.core.responses.entitlementOverride.EntitlementOverrideListEntitlementOverrideForSubscriptionResponse;
-
-import com.chargebee.v4.core.responses.entitlementOverride.EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse;
-
-public final class EntitlementOverrideService extends BaseService<EntitlementOverrideService> {
-
-  private final ServiceConfig config;
-
-  public EntitlementOverrideService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private EntitlementOverrideService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private EntitlementOverrideService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  EntitlementOverrideService with(RequestOptions newOptions) {
-    return new EntitlementOverrideService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public EntitlementOverrideService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /**
-   * listEntitlementOverrideForSubscription a entitlementOverride using immutable params (executes
-   * immediately) - returns raw Response.
-   */
-  Response listEntitlementOverrideForSubscriptionRaw(
-      String subscriptionId, EntitlementOverrideListEntitlementOverrideForSubscriptionParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/entitlement_overrides",
-            "subscription-id",
-            subscriptionId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * listEntitlementOverrideForSubscription a entitlementOverride without params (executes
-   * immediately) - returns raw Response.
-   */
-  Response listEntitlementOverrideForSubscriptionRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/entitlement_overrides",
-            "subscription-id",
-            subscriptionId);
-    return get(path, null);
-  }
-
-  /**
-   * listEntitlementOverrideForSubscription a entitlementOverride using raw JSON payload (executes
-   * immediately) - returns raw Response.
-   */
-  Response listEntitlementOverrideForSubscriptionRaw(String subscriptionId, String jsonPayload)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/entitlement_overrides",
-            "subscription-id",
-            subscriptionId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public EntitlementOverrideListEntitlementOverrideForSubscriptionResponse
-      listEntitlementOverrideForSubscription(
-          String subscriptionId,
-          EntitlementOverrideListEntitlementOverrideForSubscriptionParams params)
-          throws Exception {
-    Response response = listEntitlementOverrideForSubscriptionRaw(subscriptionId, params);
-    return EntitlementOverrideListEntitlementOverrideForSubscriptionResponse.fromJson(
-        response.getBodyAsString(), this, params, subscriptionId, response);
-  }
-
-  public EntitlementOverrideListEntitlementOverrideForSubscriptionResponse
-      listEntitlementOverrideForSubscription(String subscriptionId) throws Exception {
-    Response response = listEntitlementOverrideForSubscriptionRaw(subscriptionId);
-    return EntitlementOverrideListEntitlementOverrideForSubscriptionResponse.fromJson(
-        response.getBodyAsString(), this, null, subscriptionId, response);
-  }
-
-  /**
-   * addEntitlementOverrideForSubscription a entitlementOverride (executes immediately) - returns
-   * raw Response.
-   */
-  Response addEntitlementOverrideForSubscriptionRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/entitlement_overrides",
-            "subscription-id",
-            subscriptionId);
-
-    return post(path, null);
-  }
-
-  /**
-   * addEntitlementOverrideForSubscription a entitlementOverride using immutable params (executes
-   * immediately) - returns raw Response.
-   */
-  Response addEntitlementOverrideForSubscriptionRaw(
-      String subscriptionId, EntitlementOverrideAddEntitlementOverrideForSubscriptionParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/entitlement_overrides",
-            "subscription-id",
-            subscriptionId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * addEntitlementOverrideForSubscription a entitlementOverride using raw JSON payload (executes
-   * immediately) - returns raw Response.
-   */
-  Response addEntitlementOverrideForSubscriptionRaw(String subscriptionId, String jsonPayload)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/entitlement_overrides",
-            "subscription-id",
-            subscriptionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse
-      addEntitlementOverrideForSubscription(
-          String subscriptionId,
-          EntitlementOverrideAddEntitlementOverrideForSubscriptionParams params)
-          throws Exception {
-    Response response = addEntitlementOverrideForSubscriptionRaw(subscriptionId, params);
-    return EntitlementOverrideAddEntitlementOverrideForSubscriptionResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/EstimateService.java b/src/main/java/com/chargebee/v4/core/services/EstimateService.java
deleted file mode 100644
index fbc7a6c8..00000000
--- a/src/main/java/com/chargebee/v4/core/services/EstimateService.java
+++ /dev/null
@@ -1,750 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateCreateSubItemEstimateParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimatePaymentSchedulesParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateCancelSubscriptionForItemsParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateResumeSubscriptionParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateCreateInvoiceForItemsParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateGiftSubscriptionForItemsParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateUpdateSubscriptionForItemsParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateRegenerateInvoiceEstimateParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateCreateSubItemForCustomerEstimateParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateChangeTermEndParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimatePauseSubscriptionParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateAdvanceInvoiceEstimateParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateUpdateSubscriptionParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateGiftSubscriptionParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateCreateSubscriptionParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateCreateInvoiceParams;
-
-import com.chargebee.v4.core.models.estimate.params.EstimateCancelSubscriptionParams;
-
-import com.chargebee.v4.core.responses.estimate.EstimateRenewalEstimateResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateCreateSubItemEstimateResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimatePaymentSchedulesResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateCancelSubscriptionForItemsResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateResumeSubscriptionResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateCreateInvoiceForItemsResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateGiftSubscriptionForItemsResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateUpdateSubscriptionForItemsResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateUpcomingInvoicesEstimateResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateRegenerateInvoiceEstimateResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateCreateSubItemForCustomerEstimateResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateChangeTermEndResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimatePauseSubscriptionResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateAdvanceInvoiceEstimateResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateUpdateSubscriptionResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateGiftSubscriptionResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateCreateSubForCustomerEstimateResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateCreateSubscriptionResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateCreateInvoiceResponse;
-
-import com.chargebee.v4.core.responses.estimate.EstimateCancelSubscriptionResponse;
-
-public final class EstimateService extends BaseService<EstimateService> {
-
-  private final ServiceConfig config;
-
-  public EstimateService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private EstimateService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private EstimateService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  EstimateService with(RequestOptions newOptions) {
-    return new EstimateService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public EstimateService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** renewalEstimate a estimate (executes immediately) - returns raw Response. */
-  Response renewalEstimateRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/renewal_estimate", "subscription-id", subscriptionId);
-
-    return get(path, null);
-  }
-
-  public EstimateRenewalEstimateResponse renewalEstimate(String subscriptionId) throws Exception {
-    Response response = renewalEstimateRaw(subscriptionId);
-    return EstimateRenewalEstimateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createSubItemEstimate a estimate using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createSubItemEstimateRaw(EstimateCreateSubItemEstimateParams params) throws Exception {
-
-    return post(
-        "/estimates/create_subscription_for_items", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createSubItemEstimate a estimate using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createSubItemEstimateRaw(String jsonPayload) throws Exception {
-
-    return postJson("/estimates/create_subscription_for_items", jsonPayload);
-  }
-
-  public EstimateCreateSubItemEstimateResponse createSubItemEstimate(
-      EstimateCreateSubItemEstimateParams params) throws Exception {
-    Response response = createSubItemEstimateRaw(params);
-
-    return EstimateCreateSubItemEstimateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * paymentSchedules a estimate using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response paymentSchedulesRaw(EstimatePaymentSchedulesParams params) throws Exception {
-
-    return post("/estimates/payment_schedules", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * paymentSchedules a estimate using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response paymentSchedulesRaw(String jsonPayload) throws Exception {
-
-    return postJson("/estimates/payment_schedules", jsonPayload);
-  }
-
-  public EstimatePaymentSchedulesResponse paymentSchedules(EstimatePaymentSchedulesParams params)
-      throws Exception {
-    Response response = paymentSchedulesRaw(params);
-
-    return EstimatePaymentSchedulesResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** cancelSubscriptionForItems a estimate (executes immediately) - returns raw Response. */
-  Response cancelSubscriptionForItemsRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/cancel_subscription_for_items_estimate",
-            "subscription-id",
-            subscriptionId);
-
-    return post(path, null);
-  }
-
-  /**
-   * cancelSubscriptionForItems a estimate using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response cancelSubscriptionForItemsRaw(
-      String subscriptionId, EstimateCancelSubscriptionForItemsParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/cancel_subscription_for_items_estimate",
-            "subscription-id",
-            subscriptionId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * cancelSubscriptionForItems a estimate using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response cancelSubscriptionForItemsRaw(String subscriptionId, String jsonPayload)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/cancel_subscription_for_items_estimate",
-            "subscription-id",
-            subscriptionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public EstimateCancelSubscriptionForItemsResponse cancelSubscriptionForItems(
-      String subscriptionId, EstimateCancelSubscriptionForItemsParams params) throws Exception {
-    Response response = cancelSubscriptionForItemsRaw(subscriptionId, params);
-    return EstimateCancelSubscriptionForItemsResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /** resumeSubscription a estimate (executes immediately) - returns raw Response. */
-  Response resumeSubscriptionRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/resume_subscription_estimate",
-            "subscription-id",
-            subscriptionId);
-
-    return post(path, null);
-  }
-
-  /**
-   * resumeSubscription a estimate using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response resumeSubscriptionRaw(String subscriptionId, EstimateResumeSubscriptionParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/resume_subscription_estimate",
-            "subscription-id",
-            subscriptionId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * resumeSubscription a estimate using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response resumeSubscriptionRaw(String subscriptionId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/resume_subscription_estimate",
-            "subscription-id",
-            subscriptionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public EstimateResumeSubscriptionResponse resumeSubscription(
-      String subscriptionId, EstimateResumeSubscriptionParams params) throws Exception {
-    Response response = resumeSubscriptionRaw(subscriptionId, params);
-    return EstimateResumeSubscriptionResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createInvoiceForItems a estimate using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createInvoiceForItemsRaw(EstimateCreateInvoiceForItemsParams params) throws Exception {
-
-    return post("/estimates/create_invoice_for_items", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createInvoiceForItems a estimate using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createInvoiceForItemsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/estimates/create_invoice_for_items", jsonPayload);
-  }
-
-  public EstimateCreateInvoiceForItemsResponse createInvoiceForItems(
-      EstimateCreateInvoiceForItemsParams params) throws Exception {
-    Response response = createInvoiceForItemsRaw(params);
-
-    return EstimateCreateInvoiceForItemsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * giftSubscriptionForItems a estimate using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response giftSubscriptionForItemsRaw(EstimateGiftSubscriptionForItemsParams params)
-      throws Exception {
-
-    return post(
-        "/estimates/gift_subscription_for_items", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * giftSubscriptionForItems a estimate using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response giftSubscriptionForItemsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/estimates/gift_subscription_for_items", jsonPayload);
-  }
-
-  public EstimateGiftSubscriptionForItemsResponse giftSubscriptionForItems(
-      EstimateGiftSubscriptionForItemsParams params) throws Exception {
-    Response response = giftSubscriptionForItemsRaw(params);
-
-    return EstimateGiftSubscriptionForItemsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * updateSubscriptionForItems a estimate using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response updateSubscriptionForItemsRaw(EstimateUpdateSubscriptionForItemsParams params)
-      throws Exception {
-
-    return post(
-        "/estimates/update_subscription_for_items", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * updateSubscriptionForItems a estimate using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response updateSubscriptionForItemsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/estimates/update_subscription_for_items", jsonPayload);
-  }
-
-  public EstimateUpdateSubscriptionForItemsResponse updateSubscriptionForItems(
-      EstimateUpdateSubscriptionForItemsParams params) throws Exception {
-    Response response = updateSubscriptionForItemsRaw(params);
-
-    return EstimateUpdateSubscriptionForItemsResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /** upcomingInvoicesEstimate a estimate (executes immediately) - returns raw Response. */
-  Response upcomingInvoicesEstimateRaw(String customerId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/customers/{customer-id}/upcoming_invoices_estimate", "customer-id", customerId);
-
-    return get(path, null);
-  }
-
-  public EstimateUpcomingInvoicesEstimateResponse upcomingInvoicesEstimate(String customerId)
-      throws Exception {
-    Response response = upcomingInvoicesEstimateRaw(customerId);
-    return EstimateUpcomingInvoicesEstimateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** regenerateInvoiceEstimate a estimate (executes immediately) - returns raw Response. */
-  Response regenerateInvoiceEstimateRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/regenerate_invoice_estimate",
-            "subscription-id",
-            subscriptionId);
-
-    return post(path, null);
-  }
-
-  /**
-   * regenerateInvoiceEstimate a estimate using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response regenerateInvoiceEstimateRaw(
-      String subscriptionId, EstimateRegenerateInvoiceEstimateParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/regenerate_invoice_estimate",
-            "subscription-id",
-            subscriptionId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * regenerateInvoiceEstimate a estimate using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response regenerateInvoiceEstimateRaw(String subscriptionId, String jsonPayload)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/regenerate_invoice_estimate",
-            "subscription-id",
-            subscriptionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public EstimateRegenerateInvoiceEstimateResponse regenerateInvoiceEstimate(
-      String subscriptionId, EstimateRegenerateInvoiceEstimateParams params) throws Exception {
-    Response response = regenerateInvoiceEstimateRaw(subscriptionId, params);
-    return EstimateRegenerateInvoiceEstimateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** createSubItemForCustomerEstimate a estimate (executes immediately) - returns raw Response. */
-  Response createSubItemForCustomerEstimateRaw(String customerId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/customers/{customer-id}/create_subscription_for_items_estimate",
-            "customer-id",
-            customerId);
-
-    return post(path, null);
-  }
-
-  /**
-   * createSubItemForCustomerEstimate a estimate using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response createSubItemForCustomerEstimateRaw(
-      String customerId, EstimateCreateSubItemForCustomerEstimateParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/customers/{customer-id}/create_subscription_for_items_estimate",
-            "customer-id",
-            customerId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * createSubItemForCustomerEstimate a estimate using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response createSubItemForCustomerEstimateRaw(String customerId, String jsonPayload)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/customers/{customer-id}/create_subscription_for_items_estimate",
-            "customer-id",
-            customerId);
-    return postJson(path, jsonPayload);
-  }
-
-  public EstimateCreateSubItemForCustomerEstimateResponse createSubItemForCustomerEstimate(
-      String customerId, EstimateCreateSubItemForCustomerEstimateParams params) throws Exception {
-    Response response = createSubItemForCustomerEstimateRaw(customerId, params);
-    return EstimateCreateSubItemForCustomerEstimateResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /** changeTermEnd a estimate (executes immediately) - returns raw Response. */
-  Response changeTermEndRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/change_term_end_estimate",
-            "subscription-id",
-            subscriptionId);
-
-    return post(path, null);
-  }
-
-  /**
-   * changeTermEnd a estimate using immutable params (executes immediately) - returns raw Response.
-   */
-  Response changeTermEndRaw(String subscriptionId, EstimateChangeTermEndParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/change_term_end_estimate",
-            "subscription-id",
-            subscriptionId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * changeTermEnd a estimate using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response changeTermEndRaw(String subscriptionId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/change_term_end_estimate",
-            "subscription-id",
-            subscriptionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public EstimateChangeTermEndResponse changeTermEnd(
-      String subscriptionId, EstimateChangeTermEndParams params) throws Exception {
-    Response response = changeTermEndRaw(subscriptionId, params);
-    return EstimateChangeTermEndResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** pauseSubscription a estimate (executes immediately) - returns raw Response. */
-  Response pauseSubscriptionRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/pause_subscription_estimate",
-            "subscription-id",
-            subscriptionId);
-
-    return post(path, null);
-  }
-
-  /**
-   * pauseSubscription a estimate using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response pauseSubscriptionRaw(String subscriptionId, EstimatePauseSubscriptionParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/pause_subscription_estimate",
-            "subscription-id",
-            subscriptionId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * pauseSubscription a estimate using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response pauseSubscriptionRaw(String subscriptionId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/pause_subscription_estimate",
-            "subscription-id",
-            subscriptionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public EstimatePauseSubscriptionResponse pauseSubscription(
-      String subscriptionId, EstimatePauseSubscriptionParams params) throws Exception {
-    Response response = pauseSubscriptionRaw(subscriptionId, params);
-    return EstimatePauseSubscriptionResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** advanceInvoiceEstimate a estimate (executes immediately) - returns raw Response. */
-  Response advanceInvoiceEstimateRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/advance_invoice_estimate",
-            "subscription-id",
-            subscriptionId);
-
-    return post(path, null);
-  }
-
-  /**
-   * advanceInvoiceEstimate a estimate using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response advanceInvoiceEstimateRaw(
-      String subscriptionId, EstimateAdvanceInvoiceEstimateParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/advance_invoice_estimate",
-            "subscription-id",
-            subscriptionId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * advanceInvoiceEstimate a estimate using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response advanceInvoiceEstimateRaw(String subscriptionId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/advance_invoice_estimate",
-            "subscription-id",
-            subscriptionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public EstimateAdvanceInvoiceEstimateResponse advanceInvoiceEstimate(
-      String subscriptionId, EstimateAdvanceInvoiceEstimateParams params) throws Exception {
-    Response response = advanceInvoiceEstimateRaw(subscriptionId, params);
-    return EstimateAdvanceInvoiceEstimateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * updateSubscription a estimate using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response updateSubscriptionRaw(EstimateUpdateSubscriptionParams params) throws Exception {
-
-    return post("/estimates/update_subscription", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * updateSubscription a estimate using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response updateSubscriptionRaw(String jsonPayload) throws Exception {
-
-    return postJson("/estimates/update_subscription", jsonPayload);
-  }
-
-  public EstimateUpdateSubscriptionResponse updateSubscription(
-      EstimateUpdateSubscriptionParams params) throws Exception {
-    Response response = updateSubscriptionRaw(params);
-
-    return EstimateUpdateSubscriptionResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * giftSubscription a estimate using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response giftSubscriptionRaw(EstimateGiftSubscriptionParams params) throws Exception {
-
-    return post("/estimates/gift_subscription", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * giftSubscription a estimate using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response giftSubscriptionRaw(String jsonPayload) throws Exception {
-
-    return postJson("/estimates/gift_subscription", jsonPayload);
-  }
-
-  public EstimateGiftSubscriptionResponse giftSubscription(EstimateGiftSubscriptionParams params)
-      throws Exception {
-    Response response = giftSubscriptionRaw(params);
-
-    return EstimateGiftSubscriptionResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** createSubForCustomerEstimate a estimate (executes immediately) - returns raw Response. */
-  Response createSubForCustomerEstimateRaw(String customerId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/customers/{customer-id}/create_subscription_estimate", "customer-id", customerId);
-
-    return get(path, null);
-  }
-
-  public EstimateCreateSubForCustomerEstimateResponse createSubForCustomerEstimate(
-      String customerId) throws Exception {
-    Response response = createSubForCustomerEstimateRaw(customerId);
-    return EstimateCreateSubForCustomerEstimateResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /**
-   * createSubscription a estimate using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createSubscriptionRaw(EstimateCreateSubscriptionParams params) throws Exception {
-
-    return post("/estimates/create_subscription", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createSubscription a estimate using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createSubscriptionRaw(String jsonPayload) throws Exception {
-
-    return postJson("/estimates/create_subscription", jsonPayload);
-  }
-
-  public EstimateCreateSubscriptionResponse createSubscription(
-      EstimateCreateSubscriptionParams params) throws Exception {
-    Response response = createSubscriptionRaw(params);
-
-    return EstimateCreateSubscriptionResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createInvoice a estimate using immutable params (executes immediately) - returns raw Response.
-   */
-  Response createInvoiceRaw(EstimateCreateInvoiceParams params) throws Exception {
-
-    return post("/estimates/create_invoice", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createInvoice a estimate using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response createInvoiceRaw(String jsonPayload) throws Exception {
-
-    return postJson("/estimates/create_invoice", jsonPayload);
-  }
-
-  public EstimateCreateInvoiceResponse createInvoice(EstimateCreateInvoiceParams params)
-      throws Exception {
-    Response response = createInvoiceRaw(params);
-
-    return EstimateCreateInvoiceResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** cancelSubscription a estimate (executes immediately) - returns raw Response. */
-  Response cancelSubscriptionRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/cancel_subscription_estimate",
-            "subscription-id",
-            subscriptionId);
-
-    return post(path, null);
-  }
-
-  /**
-   * cancelSubscription a estimate using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response cancelSubscriptionRaw(String subscriptionId, EstimateCancelSubscriptionParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/cancel_subscription_estimate",
-            "subscription-id",
-            subscriptionId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * cancelSubscription a estimate using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response cancelSubscriptionRaw(String subscriptionId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/cancel_subscription_estimate",
-            "subscription-id",
-            subscriptionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public EstimateCancelSubscriptionResponse cancelSubscription(
-      String subscriptionId, EstimateCancelSubscriptionParams params) throws Exception {
-    Response response = cancelSubscriptionRaw(subscriptionId, params);
-    return EstimateCancelSubscriptionResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/ExportService.java b/src/main/java/com/chargebee/v4/core/services/ExportService.java
deleted file mode 100644
index 9607042e..00000000
--- a/src/main/java/com/chargebee/v4/core/services/ExportService.java
+++ /dev/null
@@ -1,469 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.export.params.ExportCustomersParams;
-
-import com.chargebee.v4.core.models.export.params.ExportAttachedItemsParams;
-
-import com.chargebee.v4.core.models.export.params.ExportTransactionsParams;
-
-import com.chargebee.v4.core.models.export.params.ExportDifferentialPricesParams;
-
-import com.chargebee.v4.core.models.export.params.ExportItemFamiliesParams;
-
-import com.chargebee.v4.core.models.export.params.ExportInvoicesParams;
-
-import com.chargebee.v4.core.models.export.params.ExportPriceVariantsParams;
-
-import com.chargebee.v4.core.models.export.params.ExportItemsParams;
-
-import com.chargebee.v4.core.models.export.params.ExportDeferredRevenueParams;
-
-import com.chargebee.v4.core.models.export.params.ExportRevenueRecognitionParams;
-
-import com.chargebee.v4.core.models.export.params.ExportCreditNotesParams;
-
-import com.chargebee.v4.core.models.export.params.ExportCouponsParams;
-
-import com.chargebee.v4.core.models.export.params.ExportOrdersParams;
-
-import com.chargebee.v4.core.models.export.params.ExportItemPricesParams;
-
-import com.chargebee.v4.core.models.export.params.ExportSubscriptionsParams;
-
-import com.chargebee.v4.core.models.export.params.ExportAddonsParams;
-
-import com.chargebee.v4.core.models.export.params.ExportPlansParams;
-
-import com.chargebee.v4.core.responses.export.ExportCustomersResponse;
-
-import com.chargebee.v4.core.responses.export.ExportAttachedItemsResponse;
-
-import com.chargebee.v4.core.responses.export.ExportTransactionsResponse;
-
-import com.chargebee.v4.core.responses.export.ExportDifferentialPricesResponse;
-
-import com.chargebee.v4.core.responses.export.ExportItemFamiliesResponse;
-
-import com.chargebee.v4.core.responses.export.ExportInvoicesResponse;
-
-import com.chargebee.v4.core.responses.export.ExportRetrieveResponse;
-
-import com.chargebee.v4.core.responses.export.ExportPriceVariantsResponse;
-
-import com.chargebee.v4.core.responses.export.ExportItemsResponse;
-
-import com.chargebee.v4.core.responses.export.ExportDeferredRevenueResponse;
-
-import com.chargebee.v4.core.responses.export.ExportRevenueRecognitionResponse;
-
-import com.chargebee.v4.core.responses.export.ExportCreditNotesResponse;
-
-import com.chargebee.v4.core.responses.export.ExportCouponsResponse;
-
-import com.chargebee.v4.core.responses.export.ExportOrdersResponse;
-
-import com.chargebee.v4.core.responses.export.ExportItemPricesResponse;
-
-import com.chargebee.v4.core.responses.export.ExportSubscriptionsResponse;
-
-import com.chargebee.v4.core.responses.export.ExportAddonsResponse;
-
-import com.chargebee.v4.core.responses.export.ExportPlansResponse;
-
-public final class ExportService extends BaseService<ExportService> {
-
-  private final ServiceConfig config;
-
-  public ExportService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private ExportService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private ExportService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  ExportService with(RequestOptions newOptions) {
-    return new ExportService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public ExportService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** customers a export using immutable params (executes immediately) - returns raw Response. */
-  Response customersRaw(ExportCustomersParams params) throws Exception {
-
-    return post("/exports/customers", params != null ? params.toFormData() : null);
-  }
-
-  /** customers a export using raw JSON payload (executes immediately) - returns raw Response. */
-  Response customersRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/customers", jsonPayload);
-  }
-
-  public ExportCustomersResponse customers(ExportCustomersParams params) throws Exception {
-    Response response = customersRaw(params);
-
-    return ExportCustomersResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * attachedItems a export using immutable params (executes immediately) - returns raw Response.
-   */
-  Response attachedItemsRaw(ExportAttachedItemsParams params) throws Exception {
-
-    return post("/exports/attached_items", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * attachedItems a export using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response attachedItemsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/attached_items", jsonPayload);
-  }
-
-  public ExportAttachedItemsResponse attachedItems(ExportAttachedItemsParams params)
-      throws Exception {
-    Response response = attachedItemsRaw(params);
-
-    return ExportAttachedItemsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** transactions a export using immutable params (executes immediately) - returns raw Response. */
-  Response transactionsRaw(ExportTransactionsParams params) throws Exception {
-
-    return post("/exports/transactions", params != null ? params.toFormData() : null);
-  }
-
-  /** transactions a export using raw JSON payload (executes immediately) - returns raw Response. */
-  Response transactionsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/transactions", jsonPayload);
-  }
-
-  public ExportTransactionsResponse transactions(ExportTransactionsParams params) throws Exception {
-    Response response = transactionsRaw(params);
-
-    return ExportTransactionsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * differentialPrices a export using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response differentialPricesRaw(ExportDifferentialPricesParams params) throws Exception {
-
-    return post("/exports/differential_prices", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * differentialPrices a export using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response differentialPricesRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/differential_prices", jsonPayload);
-  }
-
-  public ExportDifferentialPricesResponse differentialPrices(ExportDifferentialPricesParams params)
-      throws Exception {
-    Response response = differentialPricesRaw(params);
-
-    return ExportDifferentialPricesResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** itemFamilies a export using immutable params (executes immediately) - returns raw Response. */
-  Response itemFamiliesRaw(ExportItemFamiliesParams params) throws Exception {
-
-    return post("/exports/item_families", params != null ? params.toFormData() : null);
-  }
-
-  /** itemFamilies a export using raw JSON payload (executes immediately) - returns raw Response. */
-  Response itemFamiliesRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/item_families", jsonPayload);
-  }
-
-  public ExportItemFamiliesResponse itemFamilies(ExportItemFamiliesParams params) throws Exception {
-    Response response = itemFamiliesRaw(params);
-
-    return ExportItemFamiliesResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** invoices a export using immutable params (executes immediately) - returns raw Response. */
-  Response invoicesRaw(ExportInvoicesParams params) throws Exception {
-
-    return post("/exports/invoices", params != null ? params.toFormData() : null);
-  }
-
-  /** invoices a export using raw JSON payload (executes immediately) - returns raw Response. */
-  Response invoicesRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/invoices", jsonPayload);
-  }
-
-  public ExportInvoicesResponse invoices(ExportInvoicesParams params) throws Exception {
-    Response response = invoicesRaw(params);
-
-    return ExportInvoicesResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a export (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String exportId) throws Exception {
-    String path = buildPathWithParams("/exports/{export-id}", "export-id", exportId);
-
-    return get(path, null);
-  }
-
-  public ExportRetrieveResponse retrieve(String exportId) throws Exception {
-    Response response = retrieveRaw(exportId);
-    return ExportRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * priceVariants a export using immutable params (executes immediately) - returns raw Response.
-   */
-  Response priceVariantsRaw(ExportPriceVariantsParams params) throws Exception {
-
-    return post("/exports/price_variants", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * priceVariants a export using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response priceVariantsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/price_variants", jsonPayload);
-  }
-
-  public ExportPriceVariantsResponse priceVariants(ExportPriceVariantsParams params)
-      throws Exception {
-    Response response = priceVariantsRaw(params);
-
-    return ExportPriceVariantsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** items a export using immutable params (executes immediately) - returns raw Response. */
-  Response itemsRaw(ExportItemsParams params) throws Exception {
-
-    return post("/exports/items", params != null ? params.toFormData() : null);
-  }
-
-  /** items a export using raw JSON payload (executes immediately) - returns raw Response. */
-  Response itemsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/items", jsonPayload);
-  }
-
-  public ExportItemsResponse items(ExportItemsParams params) throws Exception {
-    Response response = itemsRaw(params);
-
-    return ExportItemsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * deferredRevenue a export using immutable params (executes immediately) - returns raw Response.
-   */
-  Response deferredRevenueRaw(ExportDeferredRevenueParams params) throws Exception {
-
-    return post("/exports/deferred_revenue", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * deferredRevenue a export using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response deferredRevenueRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/deferred_revenue", jsonPayload);
-  }
-
-  public ExportDeferredRevenueResponse deferredRevenue(ExportDeferredRevenueParams params)
-      throws Exception {
-    Response response = deferredRevenueRaw(params);
-
-    return ExportDeferredRevenueResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * revenueRecognition a export using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response revenueRecognitionRaw(ExportRevenueRecognitionParams params) throws Exception {
-
-    return post("/exports/revenue_recognition", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * revenueRecognition a export using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response revenueRecognitionRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/revenue_recognition", jsonPayload);
-  }
-
-  public ExportRevenueRecognitionResponse revenueRecognition(ExportRevenueRecognitionParams params)
-      throws Exception {
-    Response response = revenueRecognitionRaw(params);
-
-    return ExportRevenueRecognitionResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** creditNotes a export using immutable params (executes immediately) - returns raw Response. */
-  Response creditNotesRaw(ExportCreditNotesParams params) throws Exception {
-
-    return post("/exports/credit_notes", params != null ? params.toFormData() : null);
-  }
-
-  /** creditNotes a export using raw JSON payload (executes immediately) - returns raw Response. */
-  Response creditNotesRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/credit_notes", jsonPayload);
-  }
-
-  public ExportCreditNotesResponse creditNotes(ExportCreditNotesParams params) throws Exception {
-    Response response = creditNotesRaw(params);
-
-    return ExportCreditNotesResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** coupons a export using immutable params (executes immediately) - returns raw Response. */
-  Response couponsRaw(ExportCouponsParams params) throws Exception {
-
-    return post("/exports/coupons", params != null ? params.toFormData() : null);
-  }
-
-  /** coupons a export using raw JSON payload (executes immediately) - returns raw Response. */
-  Response couponsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/coupons", jsonPayload);
-  }
-
-  public ExportCouponsResponse coupons(ExportCouponsParams params) throws Exception {
-    Response response = couponsRaw(params);
-
-    return ExportCouponsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** orders a export using immutable params (executes immediately) - returns raw Response. */
-  Response ordersRaw(ExportOrdersParams params) throws Exception {
-
-    return post("/exports/orders", params != null ? params.toFormData() : null);
-  }
-
-  /** orders a export using raw JSON payload (executes immediately) - returns raw Response. */
-  Response ordersRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/orders", jsonPayload);
-  }
-
-  public ExportOrdersResponse orders(ExportOrdersParams params) throws Exception {
-    Response response = ordersRaw(params);
-
-    return ExportOrdersResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** itemPrices a export using immutable params (executes immediately) - returns raw Response. */
-  Response itemPricesRaw(ExportItemPricesParams params) throws Exception {
-
-    return post("/exports/item_prices", params != null ? params.toFormData() : null);
-  }
-
-  /** itemPrices a export using raw JSON payload (executes immediately) - returns raw Response. */
-  Response itemPricesRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/item_prices", jsonPayload);
-  }
-
-  public ExportItemPricesResponse itemPrices(ExportItemPricesParams params) throws Exception {
-    Response response = itemPricesRaw(params);
-
-    return ExportItemPricesResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * subscriptions a export using immutable params (executes immediately) - returns raw Response.
-   */
-  Response subscriptionsRaw(ExportSubscriptionsParams params) throws Exception {
-
-    return post("/exports/subscriptions", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * subscriptions a export using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response subscriptionsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/subscriptions", jsonPayload);
-  }
-
-  public ExportSubscriptionsResponse subscriptions(ExportSubscriptionsParams params)
-      throws Exception {
-    Response response = subscriptionsRaw(params);
-
-    return ExportSubscriptionsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** addons a export using immutable params (executes immediately) - returns raw Response. */
-  Response addonsRaw(ExportAddonsParams params) throws Exception {
-
-    return post("/exports/addons", params != null ? params.toFormData() : null);
-  }
-
-  /** addons a export using raw JSON payload (executes immediately) - returns raw Response. */
-  Response addonsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/addons", jsonPayload);
-  }
-
-  public ExportAddonsResponse addons(ExportAddonsParams params) throws Exception {
-    Response response = addonsRaw(params);
-
-    return ExportAddonsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** plans a export using immutable params (executes immediately) - returns raw Response. */
-  Response plansRaw(ExportPlansParams params) throws Exception {
-
-    return post("/exports/plans", params != null ? params.toFormData() : null);
-  }
-
-  /** plans a export using raw JSON payload (executes immediately) - returns raw Response. */
-  Response plansRaw(String jsonPayload) throws Exception {
-
-    return postJson("/exports/plans", jsonPayload);
-  }
-
-  public ExportPlansResponse plans(ExportPlansParams params) throws Exception {
-    Response response = plansRaw(params);
-
-    return ExportPlansResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/FeatureService.java b/src/main/java/com/chargebee/v4/core/services/FeatureService.java
deleted file mode 100644
index e5a57fcc..00000000
--- a/src/main/java/com/chargebee/v4/core/services/FeatureService.java
+++ /dev/null
@@ -1,204 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.feature.params.FeatureListParams;
-
-import com.chargebee.v4.core.models.feature.params.FeatureCreateParams;
-
-import com.chargebee.v4.core.models.feature.params.FeatureUpdateParams;
-
-import com.chargebee.v4.core.responses.feature.FeatureListResponse;
-
-import com.chargebee.v4.core.responses.feature.FeatureCreateResponse;
-
-import com.chargebee.v4.core.responses.feature.FeatureDeleteResponse;
-
-import com.chargebee.v4.core.responses.feature.FeatureRetrieveResponse;
-
-import com.chargebee.v4.core.responses.feature.FeatureUpdateResponse;
-
-import com.chargebee.v4.core.responses.feature.FeatureArchiveResponse;
-
-import com.chargebee.v4.core.responses.feature.FeatureActivateResponse;
-
-import com.chargebee.v4.core.responses.feature.FeatureReactivateResponse;
-
-public final class FeatureService extends BaseService<FeatureService> {
-
-  private final ServiceConfig config;
-
-  public FeatureService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private FeatureService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private FeatureService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  FeatureService with(RequestOptions newOptions) {
-    return new FeatureService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public FeatureService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** list a feature using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(FeatureListParams params) throws Exception {
-
-    return get("/features", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a feature without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/features", null);
-  }
-
-  /** list a feature using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public FeatureListResponse list(FeatureListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return FeatureListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public FeatureListResponse list() throws Exception {
-    Response response = listRaw();
-    return FeatureListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** create a feature using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(FeatureCreateParams params) throws Exception {
-
-    return post("/features", params != null ? params.toFormData() : null);
-  }
-
-  /** create a feature using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/features", jsonPayload);
-  }
-
-  public FeatureCreateResponse create(FeatureCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return FeatureCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** delete a feature (executes immediately) - returns raw Response. */
-  Response deleteRaw(String featureId) throws Exception {
-    String path = buildPathWithParams("/features/{feature-id}/delete", "feature-id", featureId);
-
-    return post(path, null);
-  }
-
-  public FeatureDeleteResponse delete(String featureId) throws Exception {
-    Response response = deleteRaw(featureId);
-    return FeatureDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a feature (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String featureId) throws Exception {
-    String path = buildPathWithParams("/features/{feature-id}", "feature-id", featureId);
-
-    return get(path, null);
-  }
-
-  public FeatureRetrieveResponse retrieve(String featureId) throws Exception {
-    Response response = retrieveRaw(featureId);
-    return FeatureRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** update a feature (executes immediately) - returns raw Response. */
-  Response updateRaw(String featureId) throws Exception {
-    String path = buildPathWithParams("/features/{feature-id}", "feature-id", featureId);
-
-    return post(path, null);
-  }
-
-  /** update a feature using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String featureId, FeatureUpdateParams params) throws Exception {
-    String path = buildPathWithParams("/features/{feature-id}", "feature-id", featureId);
-    return post(path, params.toFormData());
-  }
-
-  /** update a feature using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String featureId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/features/{feature-id}", "feature-id", featureId);
-    return postJson(path, jsonPayload);
-  }
-
-  public FeatureUpdateResponse update(String featureId, FeatureUpdateParams params)
-      throws Exception {
-    Response response = updateRaw(featureId, params);
-    return FeatureUpdateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** archive a feature (executes immediately) - returns raw Response. */
-  Response archiveRaw(String featureId) throws Exception {
-    String path =
-        buildPathWithParams("/features/{feature-id}/archive_command", "feature-id", featureId);
-
-    return post(path, null);
-  }
-
-  public FeatureArchiveResponse archive(String featureId) throws Exception {
-    Response response = archiveRaw(featureId);
-    return FeatureArchiveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** activate a feature (executes immediately) - returns raw Response. */
-  Response activateRaw(String featureId) throws Exception {
-    String path =
-        buildPathWithParams("/features/{feature-id}/activate_command", "feature-id", featureId);
-
-    return post(path, null);
-  }
-
-  public FeatureActivateResponse activate(String featureId) throws Exception {
-    Response response = activateRaw(featureId);
-    return FeatureActivateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** reactivate a feature (executes immediately) - returns raw Response. */
-  Response reactivateRaw(String featureId) throws Exception {
-    String path =
-        buildPathWithParams("/features/{feature-id}/reactivate_command", "feature-id", featureId);
-
-    return post(path, null);
-  }
-
-  public FeatureReactivateResponse reactivate(String featureId) throws Exception {
-    Response response = reactivateRaw(featureId);
-    return FeatureReactivateResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/GiftService.java b/src/main/java/com/chargebee/v4/core/services/GiftService.java
deleted file mode 100644
index 97d64076..00000000
--- a/src/main/java/com/chargebee/v4/core/services/GiftService.java
+++ /dev/null
@@ -1,196 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.gift.params.GiftCreateForItemsParams;
-
-import com.chargebee.v4.core.models.gift.params.GiftUpdateGiftParams;
-
-import com.chargebee.v4.core.models.gift.params.GiftListParams;
-
-import com.chargebee.v4.core.models.gift.params.GiftCreateParams;
-
-import com.chargebee.v4.core.responses.gift.GiftCreateForItemsResponse;
-
-import com.chargebee.v4.core.responses.gift.GiftCancelResponse;
-
-import com.chargebee.v4.core.responses.gift.GiftUpdateGiftResponse;
-
-import com.chargebee.v4.core.responses.gift.GiftListResponse;
-
-import com.chargebee.v4.core.responses.gift.GiftCreateResponse;
-
-import com.chargebee.v4.core.responses.gift.GiftRetrieveResponse;
-
-import com.chargebee.v4.core.responses.gift.GiftClaimResponse;
-
-public final class GiftService extends BaseService<GiftService> {
-
-  private final ServiceConfig config;
-
-  public GiftService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private GiftService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private GiftService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  GiftService with(RequestOptions newOptions) {
-    return new GiftService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public GiftService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** createForItems a gift using immutable params (executes immediately) - returns raw Response. */
-  Response createForItemsRaw(GiftCreateForItemsParams params) throws Exception {
-
-    return post("/gifts/create_for_items", params != null ? params.toFormData() : null);
-  }
-
-  /** createForItems a gift using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createForItemsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/gifts/create_for_items", jsonPayload);
-  }
-
-  public GiftCreateForItemsResponse createForItems(GiftCreateForItemsParams params)
-      throws Exception {
-    Response response = createForItemsRaw(params);
-
-    return GiftCreateForItemsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** cancel a gift (executes immediately) - returns raw Response. */
-  Response cancelRaw(String giftId) throws Exception {
-    String path = buildPathWithParams("/gifts/{gift-id}/cancel", "gift-id", giftId);
-
-    return post(path, null);
-  }
-
-  public GiftCancelResponse cancel(String giftId) throws Exception {
-    Response response = cancelRaw(giftId);
-    return GiftCancelResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** updateGift a gift (executes immediately) - returns raw Response. */
-  Response updateGiftRaw(String giftId) throws Exception {
-    String path = buildPathWithParams("/gifts/{gift-id}/update_gift", "gift-id", giftId);
-
-    return post(path, null);
-  }
-
-  /** updateGift a gift using immutable params (executes immediately) - returns raw Response. */
-  Response updateGiftRaw(String giftId, GiftUpdateGiftParams params) throws Exception {
-    String path = buildPathWithParams("/gifts/{gift-id}/update_gift", "gift-id", giftId);
-    return post(path, params.toFormData());
-  }
-
-  /** updateGift a gift using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateGiftRaw(String giftId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/gifts/{gift-id}/update_gift", "gift-id", giftId);
-    return postJson(path, jsonPayload);
-  }
-
-  public GiftUpdateGiftResponse updateGift(String giftId, GiftUpdateGiftParams params)
-      throws Exception {
-    Response response = updateGiftRaw(giftId, params);
-    return GiftUpdateGiftResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** list a gift using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(GiftListParams params) throws Exception {
-
-    return get("/gifts", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a gift without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/gifts", null);
-  }
-
-  /** list a gift using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public GiftListResponse list(GiftListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return GiftListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public GiftListResponse list() throws Exception {
-    Response response = listRaw();
-    return GiftListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** create a gift using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(GiftCreateParams params) throws Exception {
-
-    return post("/gifts", params != null ? params.toFormData() : null);
-  }
-
-  /** create a gift using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/gifts", jsonPayload);
-  }
-
-  public GiftCreateResponse create(GiftCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return GiftCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a gift (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String giftId) throws Exception {
-    String path = buildPathWithParams("/gifts/{gift-id}", "gift-id", giftId);
-
-    return get(path, null);
-  }
-
-  public GiftRetrieveResponse retrieve(String giftId) throws Exception {
-    Response response = retrieveRaw(giftId);
-    return GiftRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** claim a gift (executes immediately) - returns raw Response. */
-  Response claimRaw(String giftId) throws Exception {
-    String path = buildPathWithParams("/gifts/{gift-id}/claim", "gift-id", giftId);
-
-    return post(path, null);
-  }
-
-  public GiftClaimResponse claim(String giftId) throws Exception {
-    Response response = claimRaw(giftId);
-    return GiftClaimResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/HostedPageService.java b/src/main/java/com/chargebee/v4/core/services/HostedPageService.java
deleted file mode 100644
index 69a65f3a..00000000
--- a/src/main/java/com/chargebee/v4/core/services/HostedPageService.java
+++ /dev/null
@@ -1,646 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageCheckoutOneTimeForItemsParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageUpdatePaymentMethodParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageUpdateCardParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageExtendSubscriptionParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageEventsParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageCheckoutGiftForItemsParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageListParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageViewVoucherParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageCollectNowParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageAcceptQuoteParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageCheckoutNewForItemsParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageClaimGiftParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageCheckoutExistingForItemsParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPagePreCancelParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageRetrieveAgreementPdfParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageManagePaymentSourcesParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageCheckoutOneTimeParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageCheckoutNewParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageCheckoutGiftParams;
-
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageCheckoutExistingParams;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageCheckoutOneTimeForItemsResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageUpdatePaymentMethodResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageUpdateCardResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageExtendSubscriptionResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageEventsResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageCheckoutGiftForItemsResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageListResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageViewVoucherResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageCollectNowResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageAcceptQuoteResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageCheckoutNewForItemsResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageClaimGiftResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageCheckoutExistingForItemsResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPagePreCancelResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageAcknowledgeResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageRetrieveAgreementPdfResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageRetrieveResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageManagePaymentSourcesResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageCheckoutOneTimeResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageCheckoutNewResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageCheckoutGiftResponse;
-
-import com.chargebee.v4.core.responses.hostedPage.HostedPageCheckoutExistingResponse;
-
-public final class HostedPageService extends BaseService<HostedPageService> {
-
-  private final ServiceConfig config;
-
-  public HostedPageService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private HostedPageService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private HostedPageService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  HostedPageService with(RequestOptions newOptions) {
-    return new HostedPageService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public HostedPageService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /**
-   * checkoutOneTimeForItems a hostedPage using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response checkoutOneTimeForItemsRaw(HostedPageCheckoutOneTimeForItemsParams params)
-      throws Exception {
-
-    return post(
-        "/hosted_pages/checkout_one_time_for_items", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * checkoutOneTimeForItems a hostedPage using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response checkoutOneTimeForItemsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/checkout_one_time_for_items", jsonPayload);
-  }
-
-  public HostedPageCheckoutOneTimeForItemsResponse checkoutOneTimeForItems(
-      HostedPageCheckoutOneTimeForItemsParams params) throws Exception {
-    Response response = checkoutOneTimeForItemsRaw(params);
-
-    return HostedPageCheckoutOneTimeForItemsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * updatePaymentMethod a hostedPage using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response updatePaymentMethodRaw(HostedPageUpdatePaymentMethodParams params) throws Exception {
-
-    return post("/hosted_pages/update_payment_method", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * updatePaymentMethod a hostedPage using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response updatePaymentMethodRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/update_payment_method", jsonPayload);
-  }
-
-  public HostedPageUpdatePaymentMethodResponse updatePaymentMethod(
-      HostedPageUpdatePaymentMethodParams params) throws Exception {
-    Response response = updatePaymentMethodRaw(params);
-
-    return HostedPageUpdatePaymentMethodResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * updateCard a hostedPage using immutable params (executes immediately) - returns raw Response.
-   */
-  Response updateCardRaw(HostedPageUpdateCardParams params) throws Exception {
-
-    return post("/hosted_pages/update_card", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * updateCard a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response updateCardRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/update_card", jsonPayload);
-  }
-
-  public HostedPageUpdateCardResponse updateCard(HostedPageUpdateCardParams params)
-      throws Exception {
-    Response response = updateCardRaw(params);
-
-    return HostedPageUpdateCardResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * extendSubscription a hostedPage using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response extendSubscriptionRaw(HostedPageExtendSubscriptionParams params) throws Exception {
-
-    return post("/hosted_pages/extend_subscription", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * extendSubscription a hostedPage using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response extendSubscriptionRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/extend_subscription", jsonPayload);
-  }
-
-  public HostedPageExtendSubscriptionResponse extendSubscription(
-      HostedPageExtendSubscriptionParams params) throws Exception {
-    Response response = extendSubscriptionRaw(params);
-
-    return HostedPageExtendSubscriptionResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** events a hostedPage using immutable params (executes immediately) - returns raw Response. */
-  Response eventsRaw(HostedPageEventsParams params) throws Exception {
-
-    return post("/hosted_pages/events", params != null ? params.toFormData() : null);
-  }
-
-  /** events a hostedPage using raw JSON payload (executes immediately) - returns raw Response. */
-  Response eventsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/events", jsonPayload);
-  }
-
-  public HostedPageEventsResponse events(HostedPageEventsParams params) throws Exception {
-    Response response = eventsRaw(params);
-
-    return HostedPageEventsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * checkoutGiftForItems a hostedPage using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response checkoutGiftForItemsRaw(HostedPageCheckoutGiftForItemsParams params) throws Exception {
-
-    return post(
-        "/hosted_pages/checkout_gift_for_items", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * checkoutGiftForItems a hostedPage using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response checkoutGiftForItemsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/checkout_gift_for_items", jsonPayload);
-  }
-
-  public HostedPageCheckoutGiftForItemsResponse checkoutGiftForItems(
-      HostedPageCheckoutGiftForItemsParams params) throws Exception {
-    Response response = checkoutGiftForItemsRaw(params);
-
-    return HostedPageCheckoutGiftForItemsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** list a hostedPage using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(HostedPageListParams params) throws Exception {
-
-    return get("/hosted_pages", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a hostedPage without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/hosted_pages", null);
-  }
-
-  /** list a hostedPage using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public HostedPageListResponse list(HostedPageListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return HostedPageListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public HostedPageListResponse list() throws Exception {
-    Response response = listRaw();
-    return HostedPageListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /**
-   * viewVoucher a hostedPage using immutable params (executes immediately) - returns raw Response.
-   */
-  Response viewVoucherRaw(HostedPageViewVoucherParams params) throws Exception {
-
-    return post("/hosted_pages/view_voucher", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * viewVoucher a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response viewVoucherRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/view_voucher", jsonPayload);
-  }
-
-  public HostedPageViewVoucherResponse viewVoucher(HostedPageViewVoucherParams params)
-      throws Exception {
-    Response response = viewVoucherRaw(params);
-
-    return HostedPageViewVoucherResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * collectNow a hostedPage using immutable params (executes immediately) - returns raw Response.
-   */
-  Response collectNowRaw(HostedPageCollectNowParams params) throws Exception {
-
-    return post("/hosted_pages/collect_now", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * collectNow a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response collectNowRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/collect_now", jsonPayload);
-  }
-
-  public HostedPageCollectNowResponse collectNow(HostedPageCollectNowParams params)
-      throws Exception {
-    Response response = collectNowRaw(params);
-
-    return HostedPageCollectNowResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * acceptQuote a hostedPage using immutable params (executes immediately) - returns raw Response.
-   */
-  Response acceptQuoteRaw(HostedPageAcceptQuoteParams params) throws Exception {
-
-    return post("/hosted_pages/accept_quote", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * acceptQuote a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response acceptQuoteRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/accept_quote", jsonPayload);
-  }
-
-  public HostedPageAcceptQuoteResponse acceptQuote(HostedPageAcceptQuoteParams params)
-      throws Exception {
-    Response response = acceptQuoteRaw(params);
-
-    return HostedPageAcceptQuoteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * checkoutNewForItems a hostedPage using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response checkoutNewForItemsRaw(HostedPageCheckoutNewForItemsParams params) throws Exception {
-
-    return post(
-        "/hosted_pages/checkout_new_for_items", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * checkoutNewForItems a hostedPage using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response checkoutNewForItemsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/checkout_new_for_items", jsonPayload);
-  }
-
-  public HostedPageCheckoutNewForItemsResponse checkoutNewForItems(
-      HostedPageCheckoutNewForItemsParams params) throws Exception {
-    Response response = checkoutNewForItemsRaw(params);
-
-    return HostedPageCheckoutNewForItemsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * claimGift a hostedPage using immutable params (executes immediately) - returns raw Response.
-   */
-  Response claimGiftRaw(HostedPageClaimGiftParams params) throws Exception {
-
-    return post("/hosted_pages/claim_gift", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * claimGift a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response claimGiftRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/claim_gift", jsonPayload);
-  }
-
-  public HostedPageClaimGiftResponse claimGift(HostedPageClaimGiftParams params) throws Exception {
-    Response response = claimGiftRaw(params);
-
-    return HostedPageClaimGiftResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * checkoutExistingForItems a hostedPage using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response checkoutExistingForItemsRaw(HostedPageCheckoutExistingForItemsParams params)
-      throws Exception {
-
-    return post(
-        "/hosted_pages/checkout_existing_for_items", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * checkoutExistingForItems a hostedPage using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response checkoutExistingForItemsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/checkout_existing_for_items", jsonPayload);
-  }
-
-  public HostedPageCheckoutExistingForItemsResponse checkoutExistingForItems(
-      HostedPageCheckoutExistingForItemsParams params) throws Exception {
-    Response response = checkoutExistingForItemsRaw(params);
-
-    return HostedPageCheckoutExistingForItemsResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /**
-   * preCancel a hostedPage using immutable params (executes immediately) - returns raw Response.
-   */
-  Response preCancelRaw(HostedPagePreCancelParams params) throws Exception {
-
-    return post("/hosted_pages/pre_cancel", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * preCancel a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response preCancelRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/pre_cancel", jsonPayload);
-  }
-
-  public HostedPagePreCancelResponse preCancel(HostedPagePreCancelParams params) throws Exception {
-    Response response = preCancelRaw(params);
-
-    return HostedPagePreCancelResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** acknowledge a hostedPage (executes immediately) - returns raw Response. */
-  Response acknowledgeRaw(String hostedPageId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/hosted_pages/{hosted-page-id}/acknowledge", "hosted-page-id", hostedPageId);
-
-    return post(path, null);
-  }
-
-  public HostedPageAcknowledgeResponse acknowledge(String hostedPageId) throws Exception {
-    Response response = acknowledgeRaw(hostedPageId);
-    return HostedPageAcknowledgeResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * retrieveAgreementPdf a hostedPage using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response retrieveAgreementPdfRaw(HostedPageRetrieveAgreementPdfParams params) throws Exception {
-
-    return post(
-        "/hosted_pages/retrieve_agreement_pdf", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * retrieveAgreementPdf a hostedPage using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response retrieveAgreementPdfRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/retrieve_agreement_pdf", jsonPayload);
-  }
-
-  public HostedPageRetrieveAgreementPdfResponse retrieveAgreementPdf(
-      HostedPageRetrieveAgreementPdfParams params) throws Exception {
-    Response response = retrieveAgreementPdfRaw(params);
-
-    return HostedPageRetrieveAgreementPdfResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a hostedPage (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String hostedPageId) throws Exception {
-    String path =
-        buildPathWithParams("/hosted_pages/{hosted-page-id}", "hosted-page-id", hostedPageId);
-
-    return get(path, null);
-  }
-
-  public HostedPageRetrieveResponse retrieve(String hostedPageId) throws Exception {
-    Response response = retrieveRaw(hostedPageId);
-    return HostedPageRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * managePaymentSources a hostedPage using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response managePaymentSourcesRaw(HostedPageManagePaymentSourcesParams params) throws Exception {
-
-    return post(
-        "/hosted_pages/manage_payment_sources", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * managePaymentSources a hostedPage using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response managePaymentSourcesRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/manage_payment_sources", jsonPayload);
-  }
-
-  public HostedPageManagePaymentSourcesResponse managePaymentSources(
-      HostedPageManagePaymentSourcesParams params) throws Exception {
-    Response response = managePaymentSourcesRaw(params);
-
-    return HostedPageManagePaymentSourcesResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * checkoutOneTime a hostedPage using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response checkoutOneTimeRaw(HostedPageCheckoutOneTimeParams params) throws Exception {
-
-    return post("/hosted_pages/checkout_one_time", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * checkoutOneTime a hostedPage using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response checkoutOneTimeRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/checkout_one_time", jsonPayload);
-  }
-
-  public HostedPageCheckoutOneTimeResponse checkoutOneTime(HostedPageCheckoutOneTimeParams params)
-      throws Exception {
-    Response response = checkoutOneTimeRaw(params);
-
-    return HostedPageCheckoutOneTimeResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * checkoutNew a hostedPage using immutable params (executes immediately) - returns raw Response.
-   */
-  Response checkoutNewRaw(HostedPageCheckoutNewParams params) throws Exception {
-
-    return post("/hosted_pages/checkout_new", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * checkoutNew a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response checkoutNewRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/checkout_new", jsonPayload);
-  }
-
-  public HostedPageCheckoutNewResponse checkoutNew(HostedPageCheckoutNewParams params)
-      throws Exception {
-    Response response = checkoutNewRaw(params);
-
-    return HostedPageCheckoutNewResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * checkoutGift a hostedPage using immutable params (executes immediately) - returns raw Response.
-   */
-  Response checkoutGiftRaw(HostedPageCheckoutGiftParams params) throws Exception {
-
-    return post("/hosted_pages/checkout_gift", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * checkoutGift a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response checkoutGiftRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/checkout_gift", jsonPayload);
-  }
-
-  public HostedPageCheckoutGiftResponse checkoutGift(HostedPageCheckoutGiftParams params)
-      throws Exception {
-    Response response = checkoutGiftRaw(params);
-
-    return HostedPageCheckoutGiftResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * checkoutExisting a hostedPage using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response checkoutExistingRaw(HostedPageCheckoutExistingParams params) throws Exception {
-
-    return post("/hosted_pages/checkout_existing", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * checkoutExisting a hostedPage using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response checkoutExistingRaw(String jsonPayload) throws Exception {
-
-    return postJson("/hosted_pages/checkout_existing", jsonPayload);
-  }
-
-  public HostedPageCheckoutExistingResponse checkoutExisting(
-      HostedPageCheckoutExistingParams params) throws Exception {
-    Response response = checkoutExistingRaw(params);
-
-    return HostedPageCheckoutExistingResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/InvoiceService.java b/src/main/java/com/chargebee/v4/core/services/InvoiceService.java
deleted file mode 100644
index a47986ba..00000000
--- a/src/main/java/com/chargebee/v4/core/services/InvoiceService.java
+++ /dev/null
@@ -1,1332 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceDeleteLineItemsParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceRemoveCreditNoteParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceRemovePaymentParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceStopDunningParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceApplyPaymentsParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceApplyPaymentScheduleSchemeParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceVoidInvoiceParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceAddChargeParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceWriteOffParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceAddChargeItemParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoicePauseDunningParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceListParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceCreateParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceCloseParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceApplyCreditsParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceCreateForChargeItemParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceCreateForChargeItemsAndChargesParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceDeleteImportedParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceUpdateDetailsParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceInvoicesForCustomerParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceRecordPaymentParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceDeleteParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceImportInvoiceParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceResumeDunningParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceRecordTaxWithheldParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceRemoveTaxWithheldParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceListPaymentReferenceNumbersParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceCollectPaymentParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceRefundParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceRecordRefundParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoicePdfParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceInvoicesForSubscriptionParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceChargeAddonParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceAddAddonChargeParams;
-
-import com.chargebee.v4.core.models.invoice.params.InvoiceChargeParams;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceDeleteLineItemsResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceRemoveCreditNoteResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceRemovePaymentResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceStopDunningResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceApplyPaymentsResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceApplyPaymentScheduleSchemeResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceVoidInvoiceResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceAddChargeResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceSendEinvoiceResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoicePaymentSchedulesResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceWriteOffResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceAddChargeItemResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoicePauseDunningResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceListResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceCreateResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceCloseResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceApplyCreditsResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceRetrieveResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceCreateForChargeItemResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceCreateForChargeItemsAndChargesResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceDeleteImportedResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceUpdateDetailsResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceInvoicesForCustomerResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceRecordPaymentResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceDeleteResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceImportInvoiceResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceResumeDunningResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceRecordTaxWithheldResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceResendEinvoiceResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceRemoveTaxWithheldResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceListPaymentReferenceNumbersResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceCollectPaymentResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceSyncUsagesResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceRefundResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceRecordRefundResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoicePdfResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceInvoicesForSubscriptionResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceDownloadEinvoiceResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceChargeAddonResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceAddAddonChargeResponse;
-
-import com.chargebee.v4.core.responses.invoice.InvoiceChargeResponse;
-
-public final class InvoiceService extends BaseService<InvoiceService> {
-
-  private final ServiceConfig config;
-
-  public InvoiceService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private InvoiceService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private InvoiceService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  InvoiceService with(RequestOptions newOptions) {
-    return new InvoiceService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public InvoiceService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** deleteLineItems a invoice (executes immediately) - returns raw Response. */
-  Response deleteLineItemsRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/delete_line_items", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * deleteLineItems a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response deleteLineItemsRaw(String invoiceId, InvoiceDeleteLineItemsParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/delete_line_items", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * deleteLineItems a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response deleteLineItemsRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/delete_line_items", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceDeleteLineItemsResponse deleteLineItems(
-      String invoiceId, InvoiceDeleteLineItemsParams params) throws Exception {
-    Response response = deleteLineItemsRaw(invoiceId, params);
-    return InvoiceDeleteLineItemsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** removeCreditNote a invoice (executes immediately) - returns raw Response. */
-  Response removeCreditNoteRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/remove_credit_note", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * removeCreditNote a invoice using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response removeCreditNoteRaw(String invoiceId, InvoiceRemoveCreditNoteParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/remove_credit_note", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * removeCreditNote a invoice using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response removeCreditNoteRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/remove_credit_note", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceRemoveCreditNoteResponse removeCreditNote(
-      String invoiceId, InvoiceRemoveCreditNoteParams params) throws Exception {
-    Response response = removeCreditNoteRaw(invoiceId, params);
-    return InvoiceRemoveCreditNoteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** removePayment a invoice (executes immediately) - returns raw Response. */
-  Response removePaymentRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/remove_payment", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * removePayment a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response removePaymentRaw(String invoiceId, InvoiceRemovePaymentParams params) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/remove_payment", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * removePayment a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response removePaymentRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/remove_payment", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceRemovePaymentResponse removePayment(
-      String invoiceId, InvoiceRemovePaymentParams params) throws Exception {
-    Response response = removePaymentRaw(invoiceId, params);
-    return InvoiceRemovePaymentResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** stopDunning a invoice (executes immediately) - returns raw Response. */
-  Response stopDunningRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/stop_dunning", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /** stopDunning a invoice using immutable params (executes immediately) - returns raw Response. */
-  Response stopDunningRaw(String invoiceId, InvoiceStopDunningParams params) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/stop_dunning", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /** stopDunning a invoice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response stopDunningRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/stop_dunning", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceStopDunningResponse stopDunning(String invoiceId, InvoiceStopDunningParams params)
-      throws Exception {
-    Response response = stopDunningRaw(invoiceId, params);
-    return InvoiceStopDunningResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** applyPayments a invoice (executes immediately) - returns raw Response. */
-  Response applyPaymentsRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/apply_payments", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * applyPayments a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response applyPaymentsRaw(String invoiceId, InvoiceApplyPaymentsParams params) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/apply_payments", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * applyPayments a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response applyPaymentsRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/apply_payments", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceApplyPaymentsResponse applyPayments(
-      String invoiceId, InvoiceApplyPaymentsParams params) throws Exception {
-    Response response = applyPaymentsRaw(invoiceId, params);
-    return InvoiceApplyPaymentsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** applyPaymentScheduleScheme a invoice (executes immediately) - returns raw Response. */
-  Response applyPaymentScheduleSchemeRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/invoices/{invoice-id}/apply_payment_schedule_scheme", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * applyPaymentScheduleScheme a invoice using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response applyPaymentScheduleSchemeRaw(
-      String invoiceId, InvoiceApplyPaymentScheduleSchemeParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/invoices/{invoice-id}/apply_payment_schedule_scheme", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * applyPaymentScheduleScheme a invoice using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response applyPaymentScheduleSchemeRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/invoices/{invoice-id}/apply_payment_schedule_scheme", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceApplyPaymentScheduleSchemeResponse applyPaymentScheduleScheme(
-      String invoiceId, InvoiceApplyPaymentScheduleSchemeParams params) throws Exception {
-    Response response = applyPaymentScheduleSchemeRaw(invoiceId, params);
-    return InvoiceApplyPaymentScheduleSchemeResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** voidInvoice a invoice (executes immediately) - returns raw Response. */
-  Response voidInvoiceRaw(String invoiceId) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/void", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /** voidInvoice a invoice using immutable params (executes immediately) - returns raw Response. */
-  Response voidInvoiceRaw(String invoiceId, InvoiceVoidInvoiceParams params) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/void", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /** voidInvoice a invoice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response voidInvoiceRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/void", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceVoidInvoiceResponse voidInvoice(String invoiceId, InvoiceVoidInvoiceParams params)
-      throws Exception {
-    Response response = voidInvoiceRaw(invoiceId, params);
-    return InvoiceVoidInvoiceResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** addCharge a invoice (executes immediately) - returns raw Response. */
-  Response addChargeRaw(String invoiceId) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/add_charge", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /** addCharge a invoice using immutable params (executes immediately) - returns raw Response. */
-  Response addChargeRaw(String invoiceId, InvoiceAddChargeParams params) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/add_charge", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /** addCharge a invoice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response addChargeRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/add_charge", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceAddChargeResponse addCharge(String invoiceId, InvoiceAddChargeParams params)
-      throws Exception {
-    Response response = addChargeRaw(invoiceId, params);
-    return InvoiceAddChargeResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** sendEinvoice a invoice (executes immediately) - returns raw Response. */
-  Response sendEinvoiceRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/send_einvoice", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  public InvoiceSendEinvoiceResponse sendEinvoice(String invoiceId) throws Exception {
-    Response response = sendEinvoiceRaw(invoiceId);
-    return InvoiceSendEinvoiceResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** paymentSchedules a invoice (executes immediately) - returns raw Response. */
-  Response paymentSchedulesRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/payment_schedules", "invoice-id", invoiceId);
-
-    return get(path, null);
-  }
-
-  public InvoicePaymentSchedulesResponse paymentSchedules(String invoiceId) throws Exception {
-    Response response = paymentSchedulesRaw(invoiceId);
-    return InvoicePaymentSchedulesResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** writeOff a invoice (executes immediately) - returns raw Response. */
-  Response writeOffRaw(String invoiceId) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/write_off", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /** writeOff a invoice using immutable params (executes immediately) - returns raw Response. */
-  Response writeOffRaw(String invoiceId, InvoiceWriteOffParams params) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/write_off", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /** writeOff a invoice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response writeOffRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/write_off", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceWriteOffResponse writeOff(String invoiceId, InvoiceWriteOffParams params)
-      throws Exception {
-    Response response = writeOffRaw(invoiceId, params);
-    return InvoiceWriteOffResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** addChargeItem a invoice (executes immediately) - returns raw Response. */
-  Response addChargeItemRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/add_charge_item", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * addChargeItem a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response addChargeItemRaw(String invoiceId, InvoiceAddChargeItemParams params) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/add_charge_item", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * addChargeItem a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response addChargeItemRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/add_charge_item", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceAddChargeItemResponse addChargeItem(
-      String invoiceId, InvoiceAddChargeItemParams params) throws Exception {
-    Response response = addChargeItemRaw(invoiceId, params);
-    return InvoiceAddChargeItemResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** pauseDunning a invoice (executes immediately) - returns raw Response. */
-  Response pauseDunningRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/pause_dunning", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * pauseDunning a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response pauseDunningRaw(String invoiceId, InvoicePauseDunningParams params) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/pause_dunning", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * pauseDunning a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response pauseDunningRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/pause_dunning", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoicePauseDunningResponse pauseDunning(
-      String invoiceId, InvoicePauseDunningParams params) throws Exception {
-    Response response = pauseDunningRaw(invoiceId, params);
-    return InvoicePauseDunningResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** list a invoice using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(InvoiceListParams params) throws Exception {
-
-    return get("/invoices", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a invoice without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/invoices", null);
-  }
-
-  /** list a invoice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public InvoiceListResponse list(InvoiceListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return InvoiceListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public InvoiceListResponse list() throws Exception {
-    Response response = listRaw();
-    return InvoiceListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** create a invoice using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(InvoiceCreateParams params) throws Exception {
-
-    return post("/invoices", params != null ? params.toFormData() : null);
-  }
-
-  /** create a invoice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/invoices", jsonPayload);
-  }
-
-  public InvoiceCreateResponse create(InvoiceCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return InvoiceCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** close a invoice (executes immediately) - returns raw Response. */
-  Response closeRaw(String invoiceId) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/close", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /** close a invoice using immutable params (executes immediately) - returns raw Response. */
-  Response closeRaw(String invoiceId, InvoiceCloseParams params) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/close", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /** close a invoice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response closeRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/close", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceCloseResponse close(String invoiceId, InvoiceCloseParams params) throws Exception {
-    Response response = closeRaw(invoiceId, params);
-    return InvoiceCloseResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** applyCredits a invoice (executes immediately) - returns raw Response. */
-  Response applyCreditsRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/apply_credits", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * applyCredits a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response applyCreditsRaw(String invoiceId, InvoiceApplyCreditsParams params) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/apply_credits", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * applyCredits a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response applyCreditsRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/apply_credits", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceApplyCreditsResponse applyCredits(
-      String invoiceId, InvoiceApplyCreditsParams params) throws Exception {
-    Response response = applyCreditsRaw(invoiceId, params);
-    return InvoiceApplyCreditsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a invoice (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String invoiceId) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}", "invoice-id", invoiceId);
-
-    return get(path, null);
-  }
-
-  public InvoiceRetrieveResponse retrieve(String invoiceId) throws Exception {
-    Response response = retrieveRaw(invoiceId);
-    return InvoiceRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createForChargeItem a invoice using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createForChargeItemRaw(InvoiceCreateForChargeItemParams params) throws Exception {
-
-    return post("/invoices/create_for_charge_item", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createForChargeItem a invoice using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createForChargeItemRaw(String jsonPayload) throws Exception {
-
-    return postJson("/invoices/create_for_charge_item", jsonPayload);
-  }
-
-  public InvoiceCreateForChargeItemResponse createForChargeItem(
-      InvoiceCreateForChargeItemParams params) throws Exception {
-    Response response = createForChargeItemRaw(params);
-
-    return InvoiceCreateForChargeItemResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createForChargeItemsAndCharges a invoice using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response createForChargeItemsAndChargesRaw(InvoiceCreateForChargeItemsAndChargesParams params)
-      throws Exception {
-
-    return post(
-        "/invoices/create_for_charge_items_and_charges",
-        params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createForChargeItemsAndCharges a invoice using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response createForChargeItemsAndChargesRaw(String jsonPayload) throws Exception {
-
-    return postJson("/invoices/create_for_charge_items_and_charges", jsonPayload);
-  }
-
-  public InvoiceCreateForChargeItemsAndChargesResponse createForChargeItemsAndCharges(
-      InvoiceCreateForChargeItemsAndChargesParams params) throws Exception {
-    Response response = createForChargeItemsAndChargesRaw(params);
-
-    return InvoiceCreateForChargeItemsAndChargesResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /** deleteImported a invoice (executes immediately) - returns raw Response. */
-  Response deleteImportedRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/delete_imported", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * deleteImported a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response deleteImportedRaw(String invoiceId, InvoiceDeleteImportedParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/delete_imported", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * deleteImported a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response deleteImportedRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/delete_imported", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceDeleteImportedResponse deleteImported(
-      String invoiceId, InvoiceDeleteImportedParams params) throws Exception {
-    Response response = deleteImportedRaw(invoiceId, params);
-    return InvoiceDeleteImportedResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** updateDetails a invoice (executes immediately) - returns raw Response. */
-  Response updateDetailsRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/update_details", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * updateDetails a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response updateDetailsRaw(String invoiceId, InvoiceUpdateDetailsParams params) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/update_details", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * updateDetails a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response updateDetailsRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/update_details", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceUpdateDetailsResponse updateDetails(
-      String invoiceId, InvoiceUpdateDetailsParams params) throws Exception {
-    Response response = updateDetailsRaw(invoiceId, params);
-    return InvoiceUpdateDetailsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * invoicesForCustomer a invoice using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response invoicesForCustomerRaw(String customerId, InvoiceInvoicesForCustomerParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/invoices", "customer-id", customerId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /** invoicesForCustomer a invoice without params (executes immediately) - returns raw Response. */
-  Response invoicesForCustomerRaw(String customerId) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/invoices", "customer-id", customerId);
-    return get(path, null);
-  }
-
-  /**
-   * invoicesForCustomer a invoice using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response invoicesForCustomerRaw(String customerId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/invoices", "customer-id", customerId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public InvoiceInvoicesForCustomerResponse invoicesForCustomer(
-      String customerId, InvoiceInvoicesForCustomerParams params) throws Exception {
-    Response response = invoicesForCustomerRaw(customerId, params);
-    return InvoiceInvoicesForCustomerResponse.fromJson(
-        response.getBodyAsString(), this, params, customerId, response);
-  }
-
-  public InvoiceInvoicesForCustomerResponse invoicesForCustomer(String customerId)
-      throws Exception {
-    Response response = invoicesForCustomerRaw(customerId);
-    return InvoiceInvoicesForCustomerResponse.fromJson(
-        response.getBodyAsString(), this, null, customerId, response);
-  }
-
-  /** recordPayment a invoice (executes immediately) - returns raw Response. */
-  Response recordPaymentRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/record_payment", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * recordPayment a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response recordPaymentRaw(String invoiceId, InvoiceRecordPaymentParams params) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/record_payment", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * recordPayment a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response recordPaymentRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/record_payment", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceRecordPaymentResponse recordPayment(
-      String invoiceId, InvoiceRecordPaymentParams params) throws Exception {
-    Response response = recordPaymentRaw(invoiceId, params);
-    return InvoiceRecordPaymentResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** delete a invoice (executes immediately) - returns raw Response. */
-  Response deleteRaw(String invoiceId) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/delete", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /** delete a invoice using immutable params (executes immediately) - returns raw Response. */
-  Response deleteRaw(String invoiceId, InvoiceDeleteParams params) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/delete", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /** delete a invoice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response deleteRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/delete", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceDeleteResponse delete(String invoiceId, InvoiceDeleteParams params)
-      throws Exception {
-    Response response = deleteRaw(invoiceId, params);
-    return InvoiceDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * importInvoice a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response importInvoiceRaw(InvoiceImportInvoiceParams params) throws Exception {
-
-    return post("/invoices/import_invoice", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * importInvoice a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response importInvoiceRaw(String jsonPayload) throws Exception {
-
-    return postJson("/invoices/import_invoice", jsonPayload);
-  }
-
-  public InvoiceImportInvoiceResponse importInvoice(InvoiceImportInvoiceParams params)
-      throws Exception {
-    Response response = importInvoiceRaw(params);
-
-    return InvoiceImportInvoiceResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** resumeDunning a invoice (executes immediately) - returns raw Response. */
-  Response resumeDunningRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/resume_dunning", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * resumeDunning a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response resumeDunningRaw(String invoiceId, InvoiceResumeDunningParams params) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/resume_dunning", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * resumeDunning a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response resumeDunningRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/resume_dunning", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceResumeDunningResponse resumeDunning(
-      String invoiceId, InvoiceResumeDunningParams params) throws Exception {
-    Response response = resumeDunningRaw(invoiceId, params);
-    return InvoiceResumeDunningResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** recordTaxWithheld a invoice (executes immediately) - returns raw Response. */
-  Response recordTaxWithheldRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/record_tax_withheld", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * recordTaxWithheld a invoice using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response recordTaxWithheldRaw(String invoiceId, InvoiceRecordTaxWithheldParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/record_tax_withheld", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * recordTaxWithheld a invoice using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response recordTaxWithheldRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/record_tax_withheld", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceRecordTaxWithheldResponse recordTaxWithheld(
-      String invoiceId, InvoiceRecordTaxWithheldParams params) throws Exception {
-    Response response = recordTaxWithheldRaw(invoiceId, params);
-    return InvoiceRecordTaxWithheldResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** resendEinvoice a invoice (executes immediately) - returns raw Response. */
-  Response resendEinvoiceRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/resend_einvoice", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  public InvoiceResendEinvoiceResponse resendEinvoice(String invoiceId) throws Exception {
-    Response response = resendEinvoiceRaw(invoiceId);
-    return InvoiceResendEinvoiceResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** removeTaxWithheld a invoice (executes immediately) - returns raw Response. */
-  Response removeTaxWithheldRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/remove_tax_withheld", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * removeTaxWithheld a invoice using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response removeTaxWithheldRaw(String invoiceId, InvoiceRemoveTaxWithheldParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/remove_tax_withheld", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * removeTaxWithheld a invoice using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response removeTaxWithheldRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/remove_tax_withheld", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceRemoveTaxWithheldResponse removeTaxWithheld(
-      String invoiceId, InvoiceRemoveTaxWithheldParams params) throws Exception {
-    Response response = removeTaxWithheldRaw(invoiceId, params);
-    return InvoiceRemoveTaxWithheldResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * listPaymentReferenceNumbers a invoice using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response listPaymentReferenceNumbersRaw(InvoiceListPaymentReferenceNumbersParams params)
-      throws Exception {
-
-    return get(
-        "/invoices/payment_reference_numbers", params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * listPaymentReferenceNumbers a invoice without params (executes immediately) - returns raw
-   * Response.
-   */
-  Response listPaymentReferenceNumbersRaw() throws Exception {
-
-    return get("/invoices/payment_reference_numbers", null);
-  }
-
-  /**
-   * listPaymentReferenceNumbers a invoice using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response listPaymentReferenceNumbersRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public InvoiceListPaymentReferenceNumbersResponse listPaymentReferenceNumbers(
-      InvoiceListPaymentReferenceNumbersParams params) throws Exception {
-    Response response = listPaymentReferenceNumbersRaw(params);
-
-    return InvoiceListPaymentReferenceNumbersResponse.fromJson(
-        response.getBodyAsString(), this, params, response);
-  }
-
-  public InvoiceListPaymentReferenceNumbersResponse listPaymentReferenceNumbers() throws Exception {
-    Response response = listPaymentReferenceNumbersRaw();
-    return InvoiceListPaymentReferenceNumbersResponse.fromJson(
-        response.getBodyAsString(), this, null, response);
-  }
-
-  /** collectPayment a invoice (executes immediately) - returns raw Response. */
-  Response collectPaymentRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/collect_payment", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * collectPayment a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response collectPaymentRaw(String invoiceId, InvoiceCollectPaymentParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/collect_payment", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * collectPayment a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response collectPaymentRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/collect_payment", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceCollectPaymentResponse collectPayment(
-      String invoiceId, InvoiceCollectPaymentParams params) throws Exception {
-    Response response = collectPaymentRaw(invoiceId, params);
-    return InvoiceCollectPaymentResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** syncUsages a invoice (executes immediately) - returns raw Response. */
-  Response syncUsagesRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/sync_usages", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  public InvoiceSyncUsagesResponse syncUsages(String invoiceId) throws Exception {
-    Response response = syncUsagesRaw(invoiceId);
-    return InvoiceSyncUsagesResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** refund a invoice (executes immediately) - returns raw Response. */
-  Response refundRaw(String invoiceId) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/refund", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /** refund a invoice using immutable params (executes immediately) - returns raw Response. */
-  Response refundRaw(String invoiceId, InvoiceRefundParams params) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/refund", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /** refund a invoice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response refundRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/refund", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceRefundResponse refund(String invoiceId, InvoiceRefundParams params)
-      throws Exception {
-    Response response = refundRaw(invoiceId, params);
-    return InvoiceRefundResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** recordRefund a invoice (executes immediately) - returns raw Response. */
-  Response recordRefundRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/record_refund", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * recordRefund a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response recordRefundRaw(String invoiceId, InvoiceRecordRefundParams params) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/record_refund", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * recordRefund a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response recordRefundRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/record_refund", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceRecordRefundResponse recordRefund(
-      String invoiceId, InvoiceRecordRefundParams params) throws Exception {
-    Response response = recordRefundRaw(invoiceId, params);
-    return InvoiceRecordRefundResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** pdf a invoice (executes immediately) - returns raw Response. */
-  Response pdfRaw(String invoiceId) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/pdf", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /** pdf a invoice using immutable params (executes immediately) - returns raw Response. */
-  Response pdfRaw(String invoiceId, InvoicePdfParams params) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/pdf", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /** pdf a invoice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response pdfRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/pdf", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoicePdfResponse pdf(String invoiceId, InvoicePdfParams params) throws Exception {
-    Response response = pdfRaw(invoiceId, params);
-    return InvoicePdfResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * invoicesForSubscription a invoice using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response invoicesForSubscriptionRaw(
-      String subscriptionId, InvoiceInvoicesForSubscriptionParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/invoices", "subscription-id", subscriptionId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * invoicesForSubscription a invoice without params (executes immediately) - returns raw Response.
-   */
-  Response invoicesForSubscriptionRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/invoices", "subscription-id", subscriptionId);
-    return get(path, null);
-  }
-
-  /**
-   * invoicesForSubscription a invoice using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response invoicesForSubscriptionRaw(String subscriptionId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/invoices", "subscription-id", subscriptionId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public InvoiceInvoicesForSubscriptionResponse invoicesForSubscription(
-      String subscriptionId, InvoiceInvoicesForSubscriptionParams params) throws Exception {
-    Response response = invoicesForSubscriptionRaw(subscriptionId, params);
-    return InvoiceInvoicesForSubscriptionResponse.fromJson(
-        response.getBodyAsString(), this, params, subscriptionId, response);
-  }
-
-  public InvoiceInvoicesForSubscriptionResponse invoicesForSubscription(String subscriptionId)
-      throws Exception {
-    Response response = invoicesForSubscriptionRaw(subscriptionId);
-    return InvoiceInvoicesForSubscriptionResponse.fromJson(
-        response.getBodyAsString(), this, null, subscriptionId, response);
-  }
-
-  /** downloadEinvoice a invoice (executes immediately) - returns raw Response. */
-  Response downloadEinvoiceRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/download_einvoice", "invoice-id", invoiceId);
-
-    return get(path, null);
-  }
-
-  public InvoiceDownloadEinvoiceResponse downloadEinvoice(String invoiceId) throws Exception {
-    Response response = downloadEinvoiceRaw(invoiceId);
-    return InvoiceDownloadEinvoiceResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** chargeAddon a invoice using immutable params (executes immediately) - returns raw Response. */
-  Response chargeAddonRaw(InvoiceChargeAddonParams params) throws Exception {
-
-    return post("/invoices/charge_addon", params != null ? params.toFormData() : null);
-  }
-
-  /** chargeAddon a invoice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response chargeAddonRaw(String jsonPayload) throws Exception {
-
-    return postJson("/invoices/charge_addon", jsonPayload);
-  }
-
-  public InvoiceChargeAddonResponse chargeAddon(InvoiceChargeAddonParams params) throws Exception {
-    Response response = chargeAddonRaw(params);
-
-    return InvoiceChargeAddonResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** addAddonCharge a invoice (executes immediately) - returns raw Response. */
-  Response addAddonChargeRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/add_addon_charge", "invoice-id", invoiceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * addAddonCharge a invoice using immutable params (executes immediately) - returns raw Response.
-   */
-  Response addAddonChargeRaw(String invoiceId, InvoiceAddAddonChargeParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/add_addon_charge", "invoice-id", invoiceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * addAddonCharge a invoice using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response addAddonChargeRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/add_addon_charge", "invoice-id", invoiceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public InvoiceAddAddonChargeResponse addAddonCharge(
-      String invoiceId, InvoiceAddAddonChargeParams params) throws Exception {
-    Response response = addAddonChargeRaw(invoiceId, params);
-    return InvoiceAddAddonChargeResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** charge a invoice using immutable params (executes immediately) - returns raw Response. */
-  Response chargeRaw(InvoiceChargeParams params) throws Exception {
-
-    return post("/invoices/charge", params != null ? params.toFormData() : null);
-  }
-
-  /** charge a invoice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response chargeRaw(String jsonPayload) throws Exception {
-
-    return postJson("/invoices/charge", jsonPayload);
-  }
-
-  public InvoiceChargeResponse charge(InvoiceChargeParams params) throws Exception {
-    Response response = chargeRaw(params);
-
-    return InvoiceChargeResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/ItemEntitlementService.java b/src/main/java/com/chargebee/v4/core/services/ItemEntitlementService.java
deleted file mode 100644
index f73383b5..00000000
--- a/src/main/java/com/chargebee/v4/core/services/ItemEntitlementService.java
+++ /dev/null
@@ -1,227 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.itemEntitlement.params.ItemEntitlementItemEntitlementsForFeatureParams;
-
-import com.chargebee.v4.core.models.itemEntitlement.params.ItemEntitlementAddItemEntitlementsParams;
-
-import com.chargebee.v4.core.models.itemEntitlement.params.ItemEntitlementItemEntitlementsForItemParams;
-
-import com.chargebee.v4.core.models.itemEntitlement.params.ItemEntitlementUpsertOrRemoveItemEntitlementsForItemParams;
-
-import com.chargebee.v4.core.responses.itemEntitlement.ItemEntitlementItemEntitlementsForFeatureResponse;
-
-import com.chargebee.v4.core.responses.itemEntitlement.ItemEntitlementAddItemEntitlementsResponse;
-
-import com.chargebee.v4.core.responses.itemEntitlement.ItemEntitlementItemEntitlementsForItemResponse;
-
-import com.chargebee.v4.core.responses.itemEntitlement.ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse;
-
-public final class ItemEntitlementService extends BaseService<ItemEntitlementService> {
-
-  private final ServiceConfig config;
-
-  public ItemEntitlementService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private ItemEntitlementService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private ItemEntitlementService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  ItemEntitlementService with(RequestOptions newOptions) {
-    return new ItemEntitlementService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public ItemEntitlementService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /**
-   * itemEntitlementsForFeature a itemEntitlement using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response itemEntitlementsForFeatureRaw(
-      String featureId, ItemEntitlementItemEntitlementsForFeatureParams params) throws Exception {
-    String path =
-        buildPathWithParams("/features/{feature-id}/item_entitlements", "feature-id", featureId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * itemEntitlementsForFeature a itemEntitlement without params (executes immediately) - returns
-   * raw Response.
-   */
-  Response itemEntitlementsForFeatureRaw(String featureId) throws Exception {
-    String path =
-        buildPathWithParams("/features/{feature-id}/item_entitlements", "feature-id", featureId);
-    return get(path, null);
-  }
-
-  /**
-   * itemEntitlementsForFeature a itemEntitlement using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response itemEntitlementsForFeatureRaw(String featureId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/features/{feature-id}/item_entitlements", "feature-id", featureId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public ItemEntitlementItemEntitlementsForFeatureResponse itemEntitlementsForFeature(
-      String featureId, ItemEntitlementItemEntitlementsForFeatureParams params) throws Exception {
-    Response response = itemEntitlementsForFeatureRaw(featureId, params);
-    return ItemEntitlementItemEntitlementsForFeatureResponse.fromJson(
-        response.getBodyAsString(), this, params, featureId, response);
-  }
-
-  public ItemEntitlementItemEntitlementsForFeatureResponse itemEntitlementsForFeature(
-      String featureId) throws Exception {
-    Response response = itemEntitlementsForFeatureRaw(featureId);
-    return ItemEntitlementItemEntitlementsForFeatureResponse.fromJson(
-        response.getBodyAsString(), this, null, featureId, response);
-  }
-
-  /** addItemEntitlements a itemEntitlement (executes immediately) - returns raw Response. */
-  Response addItemEntitlementsRaw(String featureId) throws Exception {
-    String path =
-        buildPathWithParams("/features/{feature-id}/item_entitlements", "feature-id", featureId);
-
-    return post(path, null);
-  }
-
-  /**
-   * addItemEntitlements a itemEntitlement using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response addItemEntitlementsRaw(String featureId, ItemEntitlementAddItemEntitlementsParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/features/{feature-id}/item_entitlements", "feature-id", featureId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * addItemEntitlements a itemEntitlement using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response addItemEntitlementsRaw(String featureId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/features/{feature-id}/item_entitlements", "feature-id", featureId);
-    return postJson(path, jsonPayload);
-  }
-
-  public ItemEntitlementAddItemEntitlementsResponse addItemEntitlements(
-      String featureId, ItemEntitlementAddItemEntitlementsParams params) throws Exception {
-    Response response = addItemEntitlementsRaw(featureId, params);
-    return ItemEntitlementAddItemEntitlementsResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /**
-   * itemEntitlementsForItem a itemEntitlement using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response itemEntitlementsForItemRaw(
-      String itemId, ItemEntitlementItemEntitlementsForItemParams params) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/item_entitlements", "item-id", itemId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * itemEntitlementsForItem a itemEntitlement without params (executes immediately) - returns raw
-   * Response.
-   */
-  Response itemEntitlementsForItemRaw(String itemId) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/item_entitlements", "item-id", itemId);
-    return get(path, null);
-  }
-
-  /**
-   * itemEntitlementsForItem a itemEntitlement using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response itemEntitlementsForItemRaw(String itemId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/item_entitlements", "item-id", itemId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public ItemEntitlementItemEntitlementsForItemResponse itemEntitlementsForItem(
-      String itemId, ItemEntitlementItemEntitlementsForItemParams params) throws Exception {
-    Response response = itemEntitlementsForItemRaw(itemId, params);
-    return ItemEntitlementItemEntitlementsForItemResponse.fromJson(
-        response.getBodyAsString(), this, params, itemId, response);
-  }
-
-  public ItemEntitlementItemEntitlementsForItemResponse itemEntitlementsForItem(String itemId)
-      throws Exception {
-    Response response = itemEntitlementsForItemRaw(itemId);
-    return ItemEntitlementItemEntitlementsForItemResponse.fromJson(
-        response.getBodyAsString(), this, null, itemId, response);
-  }
-
-  /**
-   * upsertOrRemoveItemEntitlementsForItem a itemEntitlement (executes immediately) - returns raw
-   * Response.
-   */
-  Response upsertOrRemoveItemEntitlementsForItemRaw(String itemId) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/item_entitlements", "item-id", itemId);
-
-    return post(path, null);
-  }
-
-  /**
-   * upsertOrRemoveItemEntitlementsForItem a itemEntitlement using immutable params (executes
-   * immediately) - returns raw Response.
-   */
-  Response upsertOrRemoveItemEntitlementsForItemRaw(
-      String itemId, ItemEntitlementUpsertOrRemoveItemEntitlementsForItemParams params)
-      throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/item_entitlements", "item-id", itemId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * upsertOrRemoveItemEntitlementsForItem a itemEntitlement using raw JSON payload (executes
-   * immediately) - returns raw Response.
-   */
-  Response upsertOrRemoveItemEntitlementsForItemRaw(String itemId, String jsonPayload)
-      throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/item_entitlements", "item-id", itemId);
-    return postJson(path, jsonPayload);
-  }
-
-  public ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse
-      upsertOrRemoveItemEntitlementsForItem(
-          String itemId, ItemEntitlementUpsertOrRemoveItemEntitlementsForItemParams params)
-          throws Exception {
-    Response response = upsertOrRemoveItemEntitlementsForItemRaw(itemId, params);
-    return ItemEntitlementUpsertOrRemoveItemEntitlementsForItemResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/ItemPriceService.java b/src/main/java/com/chargebee/v4/core/services/ItemPriceService.java
deleted file mode 100644
index 3382f2c4..00000000
--- a/src/main/java/com/chargebee/v4/core/services/ItemPriceService.java
+++ /dev/null
@@ -1,263 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.itemPrice.params.ItemPriceFindApplicableItemsParams;
-
-import com.chargebee.v4.core.models.itemPrice.params.ItemPriceUpdateParams;
-
-import com.chargebee.v4.core.models.itemPrice.params.ItemPriceFindApplicableItemPricesParams;
-
-import com.chargebee.v4.core.models.itemPrice.params.ItemPriceListParams;
-
-import com.chargebee.v4.core.models.itemPrice.params.ItemPriceCreateParams;
-
-import com.chargebee.v4.core.responses.itemPrice.ItemPriceFindApplicableItemsResponse;
-
-import com.chargebee.v4.core.responses.itemPrice.ItemPriceRetrieveResponse;
-
-import com.chargebee.v4.core.responses.itemPrice.ItemPriceUpdateResponse;
-
-import com.chargebee.v4.core.responses.itemPrice.ItemPriceDeleteResponse;
-
-import com.chargebee.v4.core.responses.itemPrice.ItemPriceFindApplicableItemPricesResponse;
-
-import com.chargebee.v4.core.responses.itemPrice.ItemPriceListResponse;
-
-import com.chargebee.v4.core.responses.itemPrice.ItemPriceCreateResponse;
-
-public final class ItemPriceService extends BaseService<ItemPriceService> {
-
-  private final ServiceConfig config;
-
-  public ItemPriceService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private ItemPriceService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private ItemPriceService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  ItemPriceService with(RequestOptions newOptions) {
-    return new ItemPriceService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public ItemPriceService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /**
-   * findApplicableItems a itemPrice using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response findApplicableItemsRaw(String itemPriceId, ItemPriceFindApplicableItemsParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/item_prices/{item-price-id}/applicable_items", "item-price-id", itemPriceId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * findApplicableItems a itemPrice without params (executes immediately) - returns raw Response.
-   */
-  Response findApplicableItemsRaw(String itemPriceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/item_prices/{item-price-id}/applicable_items", "item-price-id", itemPriceId);
-    return get(path, null);
-  }
-
-  /**
-   * findApplicableItems a itemPrice using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response findApplicableItemsRaw(String itemPriceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/item_prices/{item-price-id}/applicable_items", "item-price-id", itemPriceId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public ItemPriceFindApplicableItemsResponse findApplicableItems(
-      String itemPriceId, ItemPriceFindApplicableItemsParams params) throws Exception {
-    Response response = findApplicableItemsRaw(itemPriceId, params);
-    return ItemPriceFindApplicableItemsResponse.fromJson(
-        response.getBodyAsString(), this, params, itemPriceId, response);
-  }
-
-  public ItemPriceFindApplicableItemsResponse findApplicableItems(String itemPriceId)
-      throws Exception {
-    Response response = findApplicableItemsRaw(itemPriceId);
-    return ItemPriceFindApplicableItemsResponse.fromJson(
-        response.getBodyAsString(), this, null, itemPriceId, response);
-  }
-
-  /** retrieve a itemPrice (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String itemPriceId) throws Exception {
-    String path = buildPathWithParams("/item_prices/{item-price-id}", "item-price-id", itemPriceId);
-
-    return get(path, null);
-  }
-
-  public ItemPriceRetrieveResponse retrieve(String itemPriceId) throws Exception {
-    Response response = retrieveRaw(itemPriceId);
-    return ItemPriceRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** update a itemPrice (executes immediately) - returns raw Response. */
-  Response updateRaw(String itemPriceId) throws Exception {
-    String path = buildPathWithParams("/item_prices/{item-price-id}", "item-price-id", itemPriceId);
-
-    return post(path, null);
-  }
-
-  /** update a itemPrice using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String itemPriceId, ItemPriceUpdateParams params) throws Exception {
-    String path = buildPathWithParams("/item_prices/{item-price-id}", "item-price-id", itemPriceId);
-    return post(path, params.toFormData());
-  }
-
-  /** update a itemPrice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String itemPriceId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/item_prices/{item-price-id}", "item-price-id", itemPriceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public ItemPriceUpdateResponse update(String itemPriceId, ItemPriceUpdateParams params)
-      throws Exception {
-    Response response = updateRaw(itemPriceId, params);
-    return ItemPriceUpdateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** delete a itemPrice (executes immediately) - returns raw Response. */
-  Response deleteRaw(String itemPriceId) throws Exception {
-    String path =
-        buildPathWithParams("/item_prices/{item-price-id}/delete", "item-price-id", itemPriceId);
-
-    return post(path, null);
-  }
-
-  public ItemPriceDeleteResponse delete(String itemPriceId) throws Exception {
-    Response response = deleteRaw(itemPriceId);
-    return ItemPriceDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * findApplicableItemPrices a itemPrice using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response findApplicableItemPricesRaw(
-      String itemPriceId, ItemPriceFindApplicableItemPricesParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/item_prices/{item-price-id}/applicable_item_prices", "item-price-id", itemPriceId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * findApplicableItemPrices a itemPrice without params (executes immediately) - returns raw
-   * Response.
-   */
-  Response findApplicableItemPricesRaw(String itemPriceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/item_prices/{item-price-id}/applicable_item_prices", "item-price-id", itemPriceId);
-    return get(path, null);
-  }
-
-  /**
-   * findApplicableItemPrices a itemPrice using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response findApplicableItemPricesRaw(String itemPriceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/item_prices/{item-price-id}/applicable_item_prices", "item-price-id", itemPriceId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public ItemPriceFindApplicableItemPricesResponse findApplicableItemPrices(
-      String itemPriceId, ItemPriceFindApplicableItemPricesParams params) throws Exception {
-    Response response = findApplicableItemPricesRaw(itemPriceId, params);
-    return ItemPriceFindApplicableItemPricesResponse.fromJson(
-        response.getBodyAsString(), this, params, itemPriceId, response);
-  }
-
-  public ItemPriceFindApplicableItemPricesResponse findApplicableItemPrices(String itemPriceId)
-      throws Exception {
-    Response response = findApplicableItemPricesRaw(itemPriceId);
-    return ItemPriceFindApplicableItemPricesResponse.fromJson(
-        response.getBodyAsString(), this, null, itemPriceId, response);
-  }
-
-  /** list a itemPrice using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(ItemPriceListParams params) throws Exception {
-
-    return get("/item_prices", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a itemPrice without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/item_prices", null);
-  }
-
-  /** list a itemPrice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public ItemPriceListResponse list(ItemPriceListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return ItemPriceListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public ItemPriceListResponse list() throws Exception {
-    Response response = listRaw();
-    return ItemPriceListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** create a itemPrice using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(ItemPriceCreateParams params) throws Exception {
-
-    return post("/item_prices", params != null ? params.toFormData() : null);
-  }
-
-  /** create a itemPrice using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/item_prices", jsonPayload);
-  }
-
-  public ItemPriceCreateResponse create(ItemPriceCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return ItemPriceCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/ItemService.java b/src/main/java/com/chargebee/v4/core/services/ItemService.java
deleted file mode 100644
index dd0adae7..00000000
--- a/src/main/java/com/chargebee/v4/core/services/ItemService.java
+++ /dev/null
@@ -1,158 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.item.params.ItemListParams;
-
-import com.chargebee.v4.core.models.item.params.ItemCreateParams;
-
-import com.chargebee.v4.core.models.item.params.ItemUpdateParams;
-
-import com.chargebee.v4.core.responses.item.ItemListResponse;
-
-import com.chargebee.v4.core.responses.item.ItemCreateResponse;
-
-import com.chargebee.v4.core.responses.item.ItemDeleteResponse;
-
-import com.chargebee.v4.core.responses.item.ItemRetrieveResponse;
-
-import com.chargebee.v4.core.responses.item.ItemUpdateResponse;
-
-public final class ItemService extends BaseService<ItemService> {
-
-  private final ServiceConfig config;
-
-  public ItemService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private ItemService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private ItemService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  ItemService with(RequestOptions newOptions) {
-    return new ItemService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public ItemService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** list a item using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(ItemListParams params) throws Exception {
-
-    return get("/items", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a item without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/items", null);
-  }
-
-  /** list a item using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public ItemListResponse list(ItemListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return ItemListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public ItemListResponse list() throws Exception {
-    Response response = listRaw();
-    return ItemListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** create a item using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(ItemCreateParams params) throws Exception {
-
-    return post("/items", params != null ? params.toFormData() : null);
-  }
-
-  /** create a item using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/items", jsonPayload);
-  }
-
-  public ItemCreateResponse create(ItemCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return ItemCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** delete a item (executes immediately) - returns raw Response. */
-  Response deleteRaw(String itemId) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/delete", "item-id", itemId);
-
-    return post(path, null);
-  }
-
-  public ItemDeleteResponse delete(String itemId) throws Exception {
-    Response response = deleteRaw(itemId);
-    return ItemDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a item (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String itemId) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}", "item-id", itemId);
-
-    return get(path, null);
-  }
-
-  public ItemRetrieveResponse retrieve(String itemId) throws Exception {
-    Response response = retrieveRaw(itemId);
-    return ItemRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** update a item (executes immediately) - returns raw Response. */
-  Response updateRaw(String itemId) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}", "item-id", itemId);
-
-    return post(path, null);
-  }
-
-  /** update a item using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String itemId, ItemUpdateParams params) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}", "item-id", itemId);
-    return post(path, params.toFormData());
-  }
-
-  /** update a item using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String itemId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}", "item-id", itemId);
-    return postJson(path, jsonPayload);
-  }
-
-  public ItemUpdateResponse update(String itemId, ItemUpdateParams params) throws Exception {
-    Response response = updateRaw(itemId, params);
-    return ItemUpdateResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/MediaService.java b/src/main/java/com/chargebee/v4/core/services/MediaService.java
deleted file mode 100644
index 0eb61a7e..00000000
--- a/src/main/java/com/chargebee/v4/core/services/MediaService.java
+++ /dev/null
@@ -1,83 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.media.params.MediaCreateMediaAndAttachToItemParams;
-
-import com.chargebee.v4.core.responses.media.MediaCreateMediaAndAttachToItemResponse;
-
-public final class MediaService extends BaseService<MediaService> {
-
-  private final ServiceConfig config;
-
-  public MediaService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private MediaService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private MediaService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  MediaService with(RequestOptions newOptions) {
-    return new MediaService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public MediaService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** createMediaAndAttachToItem a media (executes immediately) - returns raw Response. */
-  Response createMediaAndAttachToItemRaw(String itemId) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/media", "item-id", itemId);
-
-    return post(path, null);
-  }
-
-  /**
-   * createMediaAndAttachToItem a media using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createMediaAndAttachToItemRaw(
-      String itemId, MediaCreateMediaAndAttachToItemParams params) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/media", "item-id", itemId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * createMediaAndAttachToItem a media using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createMediaAndAttachToItemRaw(String itemId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/items/{item-id}/media", "item-id", itemId);
-    return postJson(path, jsonPayload);
-  }
-
-  public MediaCreateMediaAndAttachToItemResponse createMediaAndAttachToItem(
-      String itemId, MediaCreateMediaAndAttachToItemParams params) throws Exception {
-    Response response = createMediaAndAttachToItemRaw(itemId, params);
-    return MediaCreateMediaAndAttachToItemResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/OfferFulfillmentService.java b/src/main/java/com/chargebee/v4/core/services/OfferFulfillmentService.java
deleted file mode 100644
index 82e036a5..00000000
--- a/src/main/java/com/chargebee/v4/core/services/OfferFulfillmentService.java
+++ /dev/null
@@ -1,149 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.offerFulfillment.params.OfferFulfillmentOfferFulfillmentsParams;
-
-import com.chargebee.v4.core.models.offerFulfillment.params.OfferFulfillmentOfferFulfillmentsUpdateParams;
-
-import com.chargebee.v4.core.responses.offerFulfillment.OfferFulfillmentOfferFulfillmentsResponse;
-
-import com.chargebee.v4.core.responses.offerFulfillment.OfferFulfillmentOfferFulfillmentsGetResponse;
-
-import com.chargebee.v4.core.responses.offerFulfillment.OfferFulfillmentOfferFulfillmentsUpdateResponse;
-
-public final class OfferFulfillmentService extends BaseService<OfferFulfillmentService> {
-
-  private final ServiceConfig config;
-
-  public OfferFulfillmentService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private OfferFulfillmentService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private OfferFulfillmentService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  OfferFulfillmentService with(RequestOptions newOptions) {
-    return new OfferFulfillmentService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public OfferFulfillmentService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /**
-   * offerFulfillments a offerFulfillment using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response offerFulfillmentsRaw(OfferFulfillmentOfferFulfillmentsParams params) throws Exception {
-
-    return post("/offer_fulfillments", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * offerFulfillments a offerFulfillment using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response offerFulfillmentsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/offer_fulfillments", jsonPayload);
-  }
-
-  public OfferFulfillmentOfferFulfillmentsResponse offerFulfillments(
-      OfferFulfillmentOfferFulfillmentsParams params) throws Exception {
-    Response response = offerFulfillmentsRaw(params);
-
-    return OfferFulfillmentOfferFulfillmentsResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** offerFulfillmentsGet a offerFulfillment (executes immediately) - returns raw Response. */
-  Response offerFulfillmentsGetRaw(String offerFulfillmentId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/offer_fulfillments/{offer-fulfillment-id}",
-            "offer-fulfillment-id",
-            offerFulfillmentId);
-
-    return get(path, null);
-  }
-
-  public OfferFulfillmentOfferFulfillmentsGetResponse offerFulfillmentsGet(
-      String offerFulfillmentId) throws Exception {
-    Response response = offerFulfillmentsGetRaw(offerFulfillmentId);
-    return OfferFulfillmentOfferFulfillmentsGetResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /** offerFulfillmentsUpdate a offerFulfillment (executes immediately) - returns raw Response. */
-  Response offerFulfillmentsUpdateRaw(String offerFulfillmentId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/offer_fulfillments/{offer-fulfillment-id}",
-            "offer-fulfillment-id",
-            offerFulfillmentId);
-
-    return post(path, null);
-  }
-
-  /**
-   * offerFulfillmentsUpdate a offerFulfillment using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response offerFulfillmentsUpdateRaw(
-      String offerFulfillmentId, OfferFulfillmentOfferFulfillmentsUpdateParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/offer_fulfillments/{offer-fulfillment-id}",
-            "offer-fulfillment-id",
-            offerFulfillmentId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * offerFulfillmentsUpdate a offerFulfillment using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response offerFulfillmentsUpdateRaw(String offerFulfillmentId, String jsonPayload)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/offer_fulfillments/{offer-fulfillment-id}",
-            "offer-fulfillment-id",
-            offerFulfillmentId);
-    return postJson(path, jsonPayload);
-  }
-
-  public OfferFulfillmentOfferFulfillmentsUpdateResponse offerFulfillmentsUpdate(
-      String offerFulfillmentId, OfferFulfillmentOfferFulfillmentsUpdateParams params)
-      throws Exception {
-    Response response = offerFulfillmentsUpdateRaw(offerFulfillmentId, params);
-    return OfferFulfillmentOfferFulfillmentsUpdateResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/OmnichannelSubscriptionItemService.java b/src/main/java/com/chargebee/v4/core/services/OmnichannelSubscriptionItemService.java
deleted file mode 100644
index 508ecd2a..00000000
--- a/src/main/java/com/chargebee/v4/core/services/OmnichannelSubscriptionItemService.java
+++ /dev/null
@@ -1,114 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.params.OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams;
-
-import com.chargebee.v4.core.responses.omnichannelSubscriptionItem.OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse;
-
-public final class OmnichannelSubscriptionItemService
-    extends BaseService<OmnichannelSubscriptionItemService> {
-
-  private final ServiceConfig config;
-
-  public OmnichannelSubscriptionItemService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private OmnichannelSubscriptionItemService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private OmnichannelSubscriptionItemService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  OmnichannelSubscriptionItemService with(RequestOptions newOptions) {
-    return new OmnichannelSubscriptionItemService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public OmnichannelSubscriptionItemService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /**
-   * listOmniSubItemScheduleChanges a omnichannelSubscriptionItem using immutable params (executes
-   * immediately) - returns raw Response.
-   */
-  Response listOmniSubItemScheduleChangesRaw(
-      String omnichannelSubscriptionItemId,
-      OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/omnichannel_subscription_items/{omnichannel-subscription-item-id}/scheduled_changes",
-            "omnichannel-subscription-item-id",
-            omnichannelSubscriptionItemId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * listOmniSubItemScheduleChanges a omnichannelSubscriptionItem without params (executes
-   * immediately) - returns raw Response.
-   */
-  Response listOmniSubItemScheduleChangesRaw(String omnichannelSubscriptionItemId)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/omnichannel_subscription_items/{omnichannel-subscription-item-id}/scheduled_changes",
-            "omnichannel-subscription-item-id",
-            omnichannelSubscriptionItemId);
-    return get(path, null);
-  }
-
-  /**
-   * listOmniSubItemScheduleChanges a omnichannelSubscriptionItem using raw JSON payload (executes
-   * immediately) - returns raw Response.
-   */
-  Response listOmniSubItemScheduleChangesRaw(
-      String omnichannelSubscriptionItemId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/omnichannel_subscription_items/{omnichannel-subscription-item-id}/scheduled_changes",
-            "omnichannel-subscription-item-id",
-            omnichannelSubscriptionItemId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse
-      listOmniSubItemScheduleChanges(
-          String omnichannelSubscriptionItemId,
-          OmnichannelSubscriptionItemListOmniSubItemScheduleChangesParams params)
-          throws Exception {
-    Response response = listOmniSubItemScheduleChangesRaw(omnichannelSubscriptionItemId, params);
-    return OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse.fromJson(
-        response.getBodyAsString(), this, params, omnichannelSubscriptionItemId, response);
-  }
-
-  public OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse
-      listOmniSubItemScheduleChanges(String omnichannelSubscriptionItemId) throws Exception {
-    Response response = listOmniSubItemScheduleChangesRaw(omnichannelSubscriptionItemId);
-    return OmnichannelSubscriptionItemListOmniSubItemScheduleChangesResponse.fromJson(
-        response.getBodyAsString(), this, null, omnichannelSubscriptionItemId, response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/OrderService.java b/src/main/java/com/chargebee/v4/core/services/OrderService.java
deleted file mode 100644
index b554ae08..00000000
--- a/src/main/java/com/chargebee/v4/core/services/OrderService.java
+++ /dev/null
@@ -1,361 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.order.params.OrderListParams;
-
-import com.chargebee.v4.core.models.order.params.OrderCreateParams;
-
-import com.chargebee.v4.core.models.order.params.OrderImportOrderParams;
-
-import com.chargebee.v4.core.models.order.params.OrderResendParams;
-
-import com.chargebee.v4.core.models.order.params.OrderReopenParams;
-
-import com.chargebee.v4.core.models.order.params.OrderOrdersForInvoiceParams;
-
-import com.chargebee.v4.core.models.order.params.OrderCancelParams;
-
-import com.chargebee.v4.core.models.order.params.OrderUpdateParams;
-
-import com.chargebee.v4.core.models.order.params.OrderCreateRefundableCreditNoteParams;
-
-import com.chargebee.v4.core.responses.order.OrderListResponse;
-
-import com.chargebee.v4.core.responses.order.OrderCreateResponse;
-
-import com.chargebee.v4.core.responses.order.OrderImportOrderResponse;
-
-import com.chargebee.v4.core.responses.order.OrderAssignOrderNumberResponse;
-
-import com.chargebee.v4.core.responses.order.OrderResendResponse;
-
-import com.chargebee.v4.core.responses.order.OrderReopenResponse;
-
-import com.chargebee.v4.core.responses.order.OrderOrdersForInvoiceResponse;
-
-import com.chargebee.v4.core.responses.order.OrderCancelResponse;
-
-import com.chargebee.v4.core.responses.order.OrderRetrieveResponse;
-
-import com.chargebee.v4.core.responses.order.OrderUpdateResponse;
-
-import com.chargebee.v4.core.responses.order.OrderDeleteResponse;
-
-import com.chargebee.v4.core.responses.order.OrderCreateRefundableCreditNoteResponse;
-
-public final class OrderService extends BaseService<OrderService> {
-
-  private final ServiceConfig config;
-
-  public OrderService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private OrderService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private OrderService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  OrderService with(RequestOptions newOptions) {
-    return new OrderService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public OrderService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** list a order using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(OrderListParams params) throws Exception {
-
-    return get("/orders", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a order without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/orders", null);
-  }
-
-  /** list a order using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public OrderListResponse list(OrderListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return OrderListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public OrderListResponse list() throws Exception {
-    Response response = listRaw();
-    return OrderListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** create a order using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(OrderCreateParams params) throws Exception {
-
-    return post("/orders", params != null ? params.toFormData() : null);
-  }
-
-  /** create a order using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/orders", jsonPayload);
-  }
-
-  public OrderCreateResponse create(OrderCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return OrderCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** importOrder a order using immutable params (executes immediately) - returns raw Response. */
-  Response importOrderRaw(OrderImportOrderParams params) throws Exception {
-
-    return post("/orders/import_order", params != null ? params.toFormData() : null);
-  }
-
-  /** importOrder a order using raw JSON payload (executes immediately) - returns raw Response. */
-  Response importOrderRaw(String jsonPayload) throws Exception {
-
-    return postJson("/orders/import_order", jsonPayload);
-  }
-
-  public OrderImportOrderResponse importOrder(OrderImportOrderParams params) throws Exception {
-    Response response = importOrderRaw(params);
-
-    return OrderImportOrderResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** assignOrderNumber a order (executes immediately) - returns raw Response. */
-  Response assignOrderNumberRaw(String orderId) throws Exception {
-    String path =
-        buildPathWithParams("/orders/{order-id}/assign_order_number", "order-id", orderId);
-
-    return post(path, null);
-  }
-
-  public OrderAssignOrderNumberResponse assignOrderNumber(String orderId) throws Exception {
-    Response response = assignOrderNumberRaw(orderId);
-    return OrderAssignOrderNumberResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** resend a order (executes immediately) - returns raw Response. */
-  Response resendRaw(String orderId) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}/resend", "order-id", orderId);
-
-    return post(path, null);
-  }
-
-  /** resend a order using immutable params (executes immediately) - returns raw Response. */
-  Response resendRaw(String orderId, OrderResendParams params) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}/resend", "order-id", orderId);
-    return post(path, params.toFormData());
-  }
-
-  /** resend a order using raw JSON payload (executes immediately) - returns raw Response. */
-  Response resendRaw(String orderId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}/resend", "order-id", orderId);
-    return postJson(path, jsonPayload);
-  }
-
-  public OrderResendResponse resend(String orderId, OrderResendParams params) throws Exception {
-    Response response = resendRaw(orderId, params);
-    return OrderResendResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** reopen a order (executes immediately) - returns raw Response. */
-  Response reopenRaw(String orderId) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}/reopen", "order-id", orderId);
-
-    return post(path, null);
-  }
-
-  /** reopen a order using immutable params (executes immediately) - returns raw Response. */
-  Response reopenRaw(String orderId, OrderReopenParams params) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}/reopen", "order-id", orderId);
-    return post(path, params.toFormData());
-  }
-
-  /** reopen a order using raw JSON payload (executes immediately) - returns raw Response. */
-  Response reopenRaw(String orderId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}/reopen", "order-id", orderId);
-    return postJson(path, jsonPayload);
-  }
-
-  public OrderReopenResponse reopen(String orderId, OrderReopenParams params) throws Exception {
-    Response response = reopenRaw(orderId, params);
-    return OrderReopenResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * ordersForInvoice a order using immutable params (executes immediately) - returns raw Response.
-   */
-  Response ordersForInvoiceRaw(String invoiceId, OrderOrdersForInvoiceParams params)
-      throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/orders", "invoice-id", invoiceId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /** ordersForInvoice a order without params (executes immediately) - returns raw Response. */
-  Response ordersForInvoiceRaw(String invoiceId) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/orders", "invoice-id", invoiceId);
-    return get(path, null);
-  }
-
-  /**
-   * ordersForInvoice a order using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response ordersForInvoiceRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/orders", "invoice-id", invoiceId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public OrderOrdersForInvoiceResponse ordersForInvoice(
-      String invoiceId, OrderOrdersForInvoiceParams params) throws Exception {
-    Response response = ordersForInvoiceRaw(invoiceId, params);
-    return OrderOrdersForInvoiceResponse.fromJson(
-        response.getBodyAsString(), this, params, invoiceId, response);
-  }
-
-  public OrderOrdersForInvoiceResponse ordersForInvoice(String invoiceId) throws Exception {
-    Response response = ordersForInvoiceRaw(invoiceId);
-    return OrderOrdersForInvoiceResponse.fromJson(
-        response.getBodyAsString(), this, null, invoiceId, response);
-  }
-
-  /** cancel a order (executes immediately) - returns raw Response. */
-  Response cancelRaw(String orderId) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}/cancel", "order-id", orderId);
-
-    return post(path, null);
-  }
-
-  /** cancel a order using immutable params (executes immediately) - returns raw Response. */
-  Response cancelRaw(String orderId, OrderCancelParams params) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}/cancel", "order-id", orderId);
-    return post(path, params.toFormData());
-  }
-
-  /** cancel a order using raw JSON payload (executes immediately) - returns raw Response. */
-  Response cancelRaw(String orderId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}/cancel", "order-id", orderId);
-    return postJson(path, jsonPayload);
-  }
-
-  public OrderCancelResponse cancel(String orderId, OrderCancelParams params) throws Exception {
-    Response response = cancelRaw(orderId, params);
-    return OrderCancelResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a order (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String orderId) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}", "order-id", orderId);
-
-    return get(path, null);
-  }
-
-  public OrderRetrieveResponse retrieve(String orderId) throws Exception {
-    Response response = retrieveRaw(orderId);
-    return OrderRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** update a order (executes immediately) - returns raw Response. */
-  Response updateRaw(String orderId) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}", "order-id", orderId);
-
-    return post(path, null);
-  }
-
-  /** update a order using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String orderId, OrderUpdateParams params) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}", "order-id", orderId);
-    return post(path, params.toFormData());
-  }
-
-  /** update a order using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String orderId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}", "order-id", orderId);
-    return postJson(path, jsonPayload);
-  }
-
-  public OrderUpdateResponse update(String orderId, OrderUpdateParams params) throws Exception {
-    Response response = updateRaw(orderId, params);
-    return OrderUpdateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** delete a order (executes immediately) - returns raw Response. */
-  Response deleteRaw(String orderId) throws Exception {
-    String path = buildPathWithParams("/orders/{order-id}/delete", "order-id", orderId);
-
-    return post(path, null);
-  }
-
-  public OrderDeleteResponse delete(String orderId) throws Exception {
-    Response response = deleteRaw(orderId);
-    return OrderDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** createRefundableCreditNote a order (executes immediately) - returns raw Response. */
-  Response createRefundableCreditNoteRaw(String orderId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/orders/{order-id}/create_refundable_credit_note", "order-id", orderId);
-
-    return post(path, null);
-  }
-
-  /**
-   * createRefundableCreditNote a order using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createRefundableCreditNoteRaw(
-      String orderId, OrderCreateRefundableCreditNoteParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/orders/{order-id}/create_refundable_credit_note", "order-id", orderId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * createRefundableCreditNote a order using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createRefundableCreditNoteRaw(String orderId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/orders/{order-id}/create_refundable_credit_note", "order-id", orderId);
-    return postJson(path, jsonPayload);
-  }
-
-  public OrderCreateRefundableCreditNoteResponse createRefundableCreditNote(
-      String orderId, OrderCreateRefundableCreditNoteParams params) throws Exception {
-    Response response = createRefundableCreditNoteRaw(orderId, params);
-    return OrderCreateRefundableCreditNoteResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/PaymentSourceService.java b/src/main/java/com/chargebee/v4/core/services/PaymentSourceService.java
deleted file mode 100644
index e1f4b1fa..00000000
--- a/src/main/java/com/chargebee/v4/core/services/PaymentSourceService.java
+++ /dev/null
@@ -1,613 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceCreateUsingPermanentTokenParams;
-
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceCreateCardParams;
-
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceVerifyBankAccountParams;
-
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceListParams;
-
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceExportPaymentSourceParams;
-
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceCreateUsingPaymentIntentParams;
-
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceCreateVoucherPaymentSourceParams;
-
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceCreateUsingTempTokenParams;
-
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceUpdateCardParams;
-
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceSwitchGatewayAccountParams;
-
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceCreateUsingTokenParams;
-
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceCreateBankAccountParams;
-
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceUpdateBankAccountParams;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceCreateUsingPermanentTokenResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceDeleteResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceCreateCardResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceVerifyBankAccountResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceListResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceExportPaymentSourceResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceCreateUsingPaymentIntentResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceAgreementPdfResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceRetrieveResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceCreateVoucherPaymentSourceResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceCreateUsingTempTokenResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceUpdateCardResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceSwitchGatewayAccountResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceCreateUsingTokenResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceDeleteLocalResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceCreateBankAccountResponse;
-
-import com.chargebee.v4.core.responses.paymentSource.PaymentSourceUpdateBankAccountResponse;
-
-public final class PaymentSourceService extends BaseService<PaymentSourceService> {
-
-  private final ServiceConfig config;
-
-  public PaymentSourceService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private PaymentSourceService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private PaymentSourceService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  PaymentSourceService with(RequestOptions newOptions) {
-    return new PaymentSourceService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public PaymentSourceService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /**
-   * createUsingPermanentToken a paymentSource using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response createUsingPermanentTokenRaw(PaymentSourceCreateUsingPermanentTokenParams params)
-      throws Exception {
-
-    return post(
-        "/payment_sources/create_using_permanent_token",
-        params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createUsingPermanentToken a paymentSource using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response createUsingPermanentTokenRaw(String jsonPayload) throws Exception {
-
-    return postJson("/payment_sources/create_using_permanent_token", jsonPayload);
-  }
-
-  public PaymentSourceCreateUsingPermanentTokenResponse createUsingPermanentToken(
-      PaymentSourceCreateUsingPermanentTokenParams params) throws Exception {
-    Response response = createUsingPermanentTokenRaw(params);
-
-    return PaymentSourceCreateUsingPermanentTokenResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /** delete a paymentSource (executes immediately) - returns raw Response. */
-  Response deleteRaw(String custPaymentSourceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/delete",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-
-    return post(path, null);
-  }
-
-  public PaymentSourceDeleteResponse delete(String custPaymentSourceId) throws Exception {
-    Response response = deleteRaw(custPaymentSourceId);
-    return PaymentSourceDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createCard a paymentSource using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createCardRaw(PaymentSourceCreateCardParams params) throws Exception {
-
-    return post("/payment_sources/create_card", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createCard a paymentSource using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createCardRaw(String jsonPayload) throws Exception {
-
-    return postJson("/payment_sources/create_card", jsonPayload);
-  }
-
-  public PaymentSourceCreateCardResponse createCard(PaymentSourceCreateCardParams params)
-      throws Exception {
-    Response response = createCardRaw(params);
-
-    return PaymentSourceCreateCardResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** verifyBankAccount a paymentSource (executes immediately) - returns raw Response. */
-  Response verifyBankAccountRaw(String custPaymentSourceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/verify_bank_account",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * verifyBankAccount a paymentSource using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response verifyBankAccountRaw(
-      String custPaymentSourceId, PaymentSourceVerifyBankAccountParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/verify_bank_account",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * verifyBankAccount a paymentSource using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response verifyBankAccountRaw(String custPaymentSourceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/verify_bank_account",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public PaymentSourceVerifyBankAccountResponse verifyBankAccount(
-      String custPaymentSourceId, PaymentSourceVerifyBankAccountParams params) throws Exception {
-    Response response = verifyBankAccountRaw(custPaymentSourceId, params);
-    return PaymentSourceVerifyBankAccountResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** list a paymentSource using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(PaymentSourceListParams params) throws Exception {
-
-    return get("/payment_sources", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a paymentSource without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/payment_sources", null);
-  }
-
-  /** list a paymentSource using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public PaymentSourceListResponse list(PaymentSourceListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return PaymentSourceListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public PaymentSourceListResponse list() throws Exception {
-    Response response = listRaw();
-    return PaymentSourceListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** exportPaymentSource a paymentSource (executes immediately) - returns raw Response. */
-  Response exportPaymentSourceRaw(String custPaymentSourceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/export_payment_source",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * exportPaymentSource a paymentSource using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response exportPaymentSourceRaw(
-      String custPaymentSourceId, PaymentSourceExportPaymentSourceParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/export_payment_source",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * exportPaymentSource a paymentSource using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response exportPaymentSourceRaw(String custPaymentSourceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/export_payment_source",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public PaymentSourceExportPaymentSourceResponse exportPaymentSource(
-      String custPaymentSourceId, PaymentSourceExportPaymentSourceParams params) throws Exception {
-    Response response = exportPaymentSourceRaw(custPaymentSourceId, params);
-    return PaymentSourceExportPaymentSourceResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createUsingPaymentIntent a paymentSource using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response createUsingPaymentIntentRaw(PaymentSourceCreateUsingPaymentIntentParams params)
-      throws Exception {
-
-    return post(
-        "/payment_sources/create_using_payment_intent",
-        params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createUsingPaymentIntent a paymentSource using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response createUsingPaymentIntentRaw(String jsonPayload) throws Exception {
-
-    return postJson("/payment_sources/create_using_payment_intent", jsonPayload);
-  }
-
-  public PaymentSourceCreateUsingPaymentIntentResponse createUsingPaymentIntent(
-      PaymentSourceCreateUsingPaymentIntentParams params) throws Exception {
-    Response response = createUsingPaymentIntentRaw(params);
-
-    return PaymentSourceCreateUsingPaymentIntentResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /** agreementPdf a paymentSource (executes immediately) - returns raw Response. */
-  Response agreementPdfRaw(String custPaymentSourceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/agreement_pdf",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-
-    return post(path, null);
-  }
-
-  public PaymentSourceAgreementPdfResponse agreementPdf(String custPaymentSourceId)
-      throws Exception {
-    Response response = agreementPdfRaw(custPaymentSourceId);
-    return PaymentSourceAgreementPdfResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a paymentSource (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String custPaymentSourceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-
-    return get(path, null);
-  }
-
-  public PaymentSourceRetrieveResponse retrieve(String custPaymentSourceId) throws Exception {
-    Response response = retrieveRaw(custPaymentSourceId);
-    return PaymentSourceRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createVoucherPaymentSource a paymentSource using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response createVoucherPaymentSourceRaw(PaymentSourceCreateVoucherPaymentSourceParams params)
-      throws Exception {
-
-    return post(
-        "/payment_sources/create_voucher_payment_source",
-        params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createVoucherPaymentSource a paymentSource using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response createVoucherPaymentSourceRaw(String jsonPayload) throws Exception {
-
-    return postJson("/payment_sources/create_voucher_payment_source", jsonPayload);
-  }
-
-  public PaymentSourceCreateVoucherPaymentSourceResponse createVoucherPaymentSource(
-      PaymentSourceCreateVoucherPaymentSourceParams params) throws Exception {
-    Response response = createVoucherPaymentSourceRaw(params);
-
-    return PaymentSourceCreateVoucherPaymentSourceResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /**
-   * createUsingTempToken a paymentSource using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response createUsingTempTokenRaw(PaymentSourceCreateUsingTempTokenParams params)
-      throws Exception {
-
-    return post(
-        "/payment_sources/create_using_temp_token", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createUsingTempToken a paymentSource using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response createUsingTempTokenRaw(String jsonPayload) throws Exception {
-
-    return postJson("/payment_sources/create_using_temp_token", jsonPayload);
-  }
-
-  public PaymentSourceCreateUsingTempTokenResponse createUsingTempToken(
-      PaymentSourceCreateUsingTempTokenParams params) throws Exception {
-    Response response = createUsingTempTokenRaw(params);
-
-    return PaymentSourceCreateUsingTempTokenResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** updateCard a paymentSource (executes immediately) - returns raw Response. */
-  Response updateCardRaw(String custPaymentSourceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/update_card",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * updateCard a paymentSource using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response updateCardRaw(String custPaymentSourceId, PaymentSourceUpdateCardParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/update_card",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * updateCard a paymentSource using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response updateCardRaw(String custPaymentSourceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/update_card",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public PaymentSourceUpdateCardResponse updateCard(
-      String custPaymentSourceId, PaymentSourceUpdateCardParams params) throws Exception {
-    Response response = updateCardRaw(custPaymentSourceId, params);
-    return PaymentSourceUpdateCardResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** switchGatewayAccount a paymentSource (executes immediately) - returns raw Response. */
-  Response switchGatewayAccountRaw(String custPaymentSourceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/switch_gateway_account",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * switchGatewayAccount a paymentSource using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response switchGatewayAccountRaw(
-      String custPaymentSourceId, PaymentSourceSwitchGatewayAccountParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/switch_gateway_account",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * switchGatewayAccount a paymentSource using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response switchGatewayAccountRaw(String custPaymentSourceId, String jsonPayload)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/switch_gateway_account",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public PaymentSourceSwitchGatewayAccountResponse switchGatewayAccount(
-      String custPaymentSourceId, PaymentSourceSwitchGatewayAccountParams params) throws Exception {
-    Response response = switchGatewayAccountRaw(custPaymentSourceId, params);
-    return PaymentSourceSwitchGatewayAccountResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createUsingToken a paymentSource using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createUsingTokenRaw(PaymentSourceCreateUsingTokenParams params) throws Exception {
-
-    return post("/payment_sources/create_using_token", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createUsingToken a paymentSource using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createUsingTokenRaw(String jsonPayload) throws Exception {
-
-    return postJson("/payment_sources/create_using_token", jsonPayload);
-  }
-
-  public PaymentSourceCreateUsingTokenResponse createUsingToken(
-      PaymentSourceCreateUsingTokenParams params) throws Exception {
-    Response response = createUsingTokenRaw(params);
-
-    return PaymentSourceCreateUsingTokenResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** deleteLocal a paymentSource (executes immediately) - returns raw Response. */
-  Response deleteLocalRaw(String custPaymentSourceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/delete_local",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-
-    return post(path, null);
-  }
-
-  public PaymentSourceDeleteLocalResponse deleteLocal(String custPaymentSourceId) throws Exception {
-    Response response = deleteLocalRaw(custPaymentSourceId);
-    return PaymentSourceDeleteLocalResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createBankAccount a paymentSource using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createBankAccountRaw(PaymentSourceCreateBankAccountParams params) throws Exception {
-
-    return post(
-        "/payment_sources/create_bank_account", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createBankAccount a paymentSource using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createBankAccountRaw(String jsonPayload) throws Exception {
-
-    return postJson("/payment_sources/create_bank_account", jsonPayload);
-  }
-
-  public PaymentSourceCreateBankAccountResponse createBankAccount(
-      PaymentSourceCreateBankAccountParams params) throws Exception {
-    Response response = createBankAccountRaw(params);
-
-    return PaymentSourceCreateBankAccountResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** updateBankAccount a paymentSource (executes immediately) - returns raw Response. */
-  Response updateBankAccountRaw(String custPaymentSourceId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/update_bank_account",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-
-    return post(path, null);
-  }
-
-  /**
-   * updateBankAccount a paymentSource using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response updateBankAccountRaw(
-      String custPaymentSourceId, PaymentSourceUpdateBankAccountParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/update_bank_account",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * updateBankAccount a paymentSource using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response updateBankAccountRaw(String custPaymentSourceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_sources/{cust-payment-source-id}/update_bank_account",
-            "cust-payment-source-id",
-            custPaymentSourceId);
-    return postJson(path, jsonPayload);
-  }
-
-  public PaymentSourceUpdateBankAccountResponse updateBankAccount(
-      String custPaymentSourceId, PaymentSourceUpdateBankAccountParams params) throws Exception {
-    Response response = updateBankAccountRaw(custPaymentSourceId, params);
-    return PaymentSourceUpdateBankAccountResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/PaymentVoucherService.java b/src/main/java/com/chargebee/v4/core/services/PaymentVoucherService.java
deleted file mode 100644
index fcfcebc7..00000000
--- a/src/main/java/com/chargebee/v4/core/services/PaymentVoucherService.java
+++ /dev/null
@@ -1,188 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.paymentVoucher.params.PaymentVoucherPaymentVouchersForCustomerParams;
-
-import com.chargebee.v4.core.models.paymentVoucher.params.PaymentVoucherPaymentVouchersForInvoiceParams;
-
-import com.chargebee.v4.core.models.paymentVoucher.params.PaymentVoucherCreateParams;
-
-import com.chargebee.v4.core.responses.paymentVoucher.PaymentVoucherPaymentVouchersForCustomerResponse;
-
-import com.chargebee.v4.core.responses.paymentVoucher.PaymentVoucherPaymentVouchersForInvoiceResponse;
-
-import com.chargebee.v4.core.responses.paymentVoucher.PaymentVoucherRetrieveResponse;
-
-import com.chargebee.v4.core.responses.paymentVoucher.PaymentVoucherCreateResponse;
-
-public final class PaymentVoucherService extends BaseService<PaymentVoucherService> {
-
-  private final ServiceConfig config;
-
-  public PaymentVoucherService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private PaymentVoucherService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private PaymentVoucherService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  PaymentVoucherService with(RequestOptions newOptions) {
-    return new PaymentVoucherService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public PaymentVoucherService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /**
-   * paymentVouchersForCustomer a paymentVoucher using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response paymentVouchersForCustomerRaw(
-      String customerId, PaymentVoucherPaymentVouchersForCustomerParams params) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/payment_vouchers", "customer-id", customerId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * paymentVouchersForCustomer a paymentVoucher without params (executes immediately) - returns raw
-   * Response.
-   */
-  Response paymentVouchersForCustomerRaw(String customerId) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/payment_vouchers", "customer-id", customerId);
-    return get(path, null);
-  }
-
-  /**
-   * paymentVouchersForCustomer a paymentVoucher using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response paymentVouchersForCustomerRaw(String customerId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/payment_vouchers", "customer-id", customerId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public PaymentVoucherPaymentVouchersForCustomerResponse paymentVouchersForCustomer(
-      String customerId, PaymentVoucherPaymentVouchersForCustomerParams params) throws Exception {
-    Response response = paymentVouchersForCustomerRaw(customerId, params);
-    return PaymentVoucherPaymentVouchersForCustomerResponse.fromJson(
-        response.getBodyAsString(), this, params, customerId, response);
-  }
-
-  public PaymentVoucherPaymentVouchersForCustomerResponse paymentVouchersForCustomer(
-      String customerId) throws Exception {
-    Response response = paymentVouchersForCustomerRaw(customerId);
-    return PaymentVoucherPaymentVouchersForCustomerResponse.fromJson(
-        response.getBodyAsString(), this, null, customerId, response);
-  }
-
-  /**
-   * paymentVouchersForInvoice a paymentVoucher using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response paymentVouchersForInvoiceRaw(
-      String invoiceId, PaymentVoucherPaymentVouchersForInvoiceParams params) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/payment_vouchers", "invoice-id", invoiceId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * paymentVouchersForInvoice a paymentVoucher without params (executes immediately) - returns raw
-   * Response.
-   */
-  Response paymentVouchersForInvoiceRaw(String invoiceId) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/payment_vouchers", "invoice-id", invoiceId);
-    return get(path, null);
-  }
-
-  /**
-   * paymentVouchersForInvoice a paymentVoucher using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response paymentVouchersForInvoiceRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/invoices/{invoice-id}/payment_vouchers", "invoice-id", invoiceId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public PaymentVoucherPaymentVouchersForInvoiceResponse paymentVouchersForInvoice(
-      String invoiceId, PaymentVoucherPaymentVouchersForInvoiceParams params) throws Exception {
-    Response response = paymentVouchersForInvoiceRaw(invoiceId, params);
-    return PaymentVoucherPaymentVouchersForInvoiceResponse.fromJson(
-        response.getBodyAsString(), this, params, invoiceId, response);
-  }
-
-  public PaymentVoucherPaymentVouchersForInvoiceResponse paymentVouchersForInvoice(String invoiceId)
-      throws Exception {
-    Response response = paymentVouchersForInvoiceRaw(invoiceId);
-    return PaymentVoucherPaymentVouchersForInvoiceResponse.fromJson(
-        response.getBodyAsString(), this, null, invoiceId, response);
-  }
-
-  /** retrieve a paymentVoucher (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String paymentVoucherId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/payment_vouchers/{payment-voucher-id}", "payment-voucher-id", paymentVoucherId);
-
-    return get(path, null);
-  }
-
-  public PaymentVoucherRetrieveResponse retrieve(String paymentVoucherId) throws Exception {
-    Response response = retrieveRaw(paymentVoucherId);
-    return PaymentVoucherRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * create a paymentVoucher using immutable params (executes immediately) - returns raw Response.
-   */
-  Response createRaw(PaymentVoucherCreateParams params) throws Exception {
-
-    return post("/payment_vouchers", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * create a paymentVoucher using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/payment_vouchers", jsonPayload);
-  }
-
-  public PaymentVoucherCreateResponse create(PaymentVoucherCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return PaymentVoucherCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/PersonalizedOfferService.java b/src/main/java/com/chargebee/v4/core/services/PersonalizedOfferService.java
deleted file mode 100644
index 99095bf5..00000000
--- a/src/main/java/com/chargebee/v4/core/services/PersonalizedOfferService.java
+++ /dev/null
@@ -1,79 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.personalizedOffer.params.PersonalizedOfferPersonalizedOffersParams;
-
-import com.chargebee.v4.core.responses.personalizedOffer.PersonalizedOfferPersonalizedOffersResponse;
-
-public final class PersonalizedOfferService extends BaseService<PersonalizedOfferService> {
-
-  private final ServiceConfig config;
-
-  public PersonalizedOfferService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private PersonalizedOfferService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private PersonalizedOfferService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  PersonalizedOfferService with(RequestOptions newOptions) {
-    return new PersonalizedOfferService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public PersonalizedOfferService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /**
-   * personalizedOffers a personalizedOffer using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response personalizedOffersRaw(PersonalizedOfferPersonalizedOffersParams params)
-      throws Exception {
-
-    return post("/personalized_offers", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * personalizedOffers a personalizedOffer using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response personalizedOffersRaw(String jsonPayload) throws Exception {
-
-    return postJson("/personalized_offers", jsonPayload);
-  }
-
-  public PersonalizedOfferPersonalizedOffersResponse personalizedOffers(
-      PersonalizedOfferPersonalizedOffersParams params) throws Exception {
-    Response response = personalizedOffersRaw(params);
-
-    return PersonalizedOfferPersonalizedOffersResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/PlanService.java b/src/main/java/com/chargebee/v4/core/services/PlanService.java
deleted file mode 100644
index 44f288b9..00000000
--- a/src/main/java/com/chargebee/v4/core/services/PlanService.java
+++ /dev/null
@@ -1,194 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.plan.params.PlanCopyParams;
-
-import com.chargebee.v4.core.models.plan.params.PlanListParams;
-
-import com.chargebee.v4.core.models.plan.params.PlanCreateParams;
-
-import com.chargebee.v4.core.models.plan.params.PlanUpdateParams;
-
-import com.chargebee.v4.core.responses.plan.PlanUnarchiveResponse;
-
-import com.chargebee.v4.core.responses.plan.PlanDeleteResponse;
-
-import com.chargebee.v4.core.responses.plan.PlanCopyResponse;
-
-import com.chargebee.v4.core.responses.plan.PlanListResponse;
-
-import com.chargebee.v4.core.responses.plan.PlanCreateResponse;
-
-import com.chargebee.v4.core.responses.plan.PlanRetrieveResponse;
-
-import com.chargebee.v4.core.responses.plan.PlanUpdateResponse;
-
-public final class PlanService extends BaseService<PlanService> {
-
-  private final ServiceConfig config;
-
-  public PlanService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private PlanService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private PlanService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  PlanService with(RequestOptions newOptions) {
-    return new PlanService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public PlanService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** unarchive a plan (executes immediately) - returns raw Response. */
-  Response unarchiveRaw(String planId) throws Exception {
-    String path = buildPathWithParams("/plans/{plan-id}/unarchive", "plan-id", planId);
-
-    return post(path, null);
-  }
-
-  public PlanUnarchiveResponse unarchive(String planId) throws Exception {
-    Response response = unarchiveRaw(planId);
-    return PlanUnarchiveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** delete a plan (executes immediately) - returns raw Response. */
-  Response deleteRaw(String planId) throws Exception {
-    String path = buildPathWithParams("/plans/{plan-id}/delete", "plan-id", planId);
-
-    return post(path, null);
-  }
-
-  public PlanDeleteResponse delete(String planId) throws Exception {
-    Response response = deleteRaw(planId);
-    return PlanDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** copy a plan using immutable params (executes immediately) - returns raw Response. */
-  Response copyRaw(PlanCopyParams params) throws Exception {
-
-    return post("/plans/copy", params != null ? params.toFormData() : null);
-  }
-
-  /** copy a plan using raw JSON payload (executes immediately) - returns raw Response. */
-  Response copyRaw(String jsonPayload) throws Exception {
-
-    return postJson("/plans/copy", jsonPayload);
-  }
-
-  public PlanCopyResponse copy(PlanCopyParams params) throws Exception {
-    Response response = copyRaw(params);
-
-    return PlanCopyResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** list a plan using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(PlanListParams params) throws Exception {
-
-    return get("/plans", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a plan without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/plans", null);
-  }
-
-  /** list a plan using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public PlanListResponse list(PlanListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return PlanListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public PlanListResponse list() throws Exception {
-    Response response = listRaw();
-    return PlanListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** create a plan using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(PlanCreateParams params) throws Exception {
-
-    return post("/plans", params != null ? params.toFormData() : null);
-  }
-
-  /** create a plan using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/plans", jsonPayload);
-  }
-
-  public PlanCreateResponse create(PlanCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return PlanCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a plan (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String planId) throws Exception {
-    String path = buildPathWithParams("/plans/{plan-id}", "plan-id", planId);
-
-    return get(path, null);
-  }
-
-  public PlanRetrieveResponse retrieve(String planId) throws Exception {
-    Response response = retrieveRaw(planId);
-    return PlanRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** update a plan (executes immediately) - returns raw Response. */
-  Response updateRaw(String planId) throws Exception {
-    String path = buildPathWithParams("/plans/{plan-id}", "plan-id", planId);
-
-    return post(path, null);
-  }
-
-  /** update a plan using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String planId, PlanUpdateParams params) throws Exception {
-    String path = buildPathWithParams("/plans/{plan-id}", "plan-id", planId);
-    return post(path, params.toFormData());
-  }
-
-  /** update a plan using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String planId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/plans/{plan-id}", "plan-id", planId);
-    return postJson(path, jsonPayload);
-  }
-
-  public PlanUpdateResponse update(String planId, PlanUpdateParams params) throws Exception {
-    Response response = updateRaw(planId, params);
-    return PlanUpdateResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/PromotionalCreditService.java b/src/main/java/com/chargebee/v4/core/services/PromotionalCreditService.java
deleted file mode 100644
index 4f8711fc..00000000
--- a/src/main/java/com/chargebee/v4/core/services/PromotionalCreditService.java
+++ /dev/null
@@ -1,183 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.promotionalCredit.params.PromotionalCreditListParams;
-
-import com.chargebee.v4.core.models.promotionalCredit.params.PromotionalCreditDeductParams;
-
-import com.chargebee.v4.core.models.promotionalCredit.params.PromotionalCreditSetParams;
-
-import com.chargebee.v4.core.models.promotionalCredit.params.PromotionalCreditAddParams;
-
-import com.chargebee.v4.core.responses.promotionalCredit.PromotionalCreditRetrieveResponse;
-
-import com.chargebee.v4.core.responses.promotionalCredit.PromotionalCreditListResponse;
-
-import com.chargebee.v4.core.responses.promotionalCredit.PromotionalCreditDeductResponse;
-
-import com.chargebee.v4.core.responses.promotionalCredit.PromotionalCreditSetResponse;
-
-import com.chargebee.v4.core.responses.promotionalCredit.PromotionalCreditAddResponse;
-
-public final class PromotionalCreditService extends BaseService<PromotionalCreditService> {
-
-  private final ServiceConfig config;
-
-  public PromotionalCreditService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private PromotionalCreditService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private PromotionalCreditService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  PromotionalCreditService with(RequestOptions newOptions) {
-    return new PromotionalCreditService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public PromotionalCreditService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** retrieve a promotionalCredit (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String accountCreditId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/promotional_credits/{account-credit-id}", "account-credit-id", accountCreditId);
-
-    return get(path, null);
-  }
-
-  public PromotionalCreditRetrieveResponse retrieve(String accountCreditId) throws Exception {
-    Response response = retrieveRaw(accountCreditId);
-    return PromotionalCreditRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * list a promotionalCredit using immutable params (executes immediately) - returns raw Response.
-   */
-  Response listRaw(PromotionalCreditListParams params) throws Exception {
-
-    return get("/promotional_credits", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a promotionalCredit without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/promotional_credits", null);
-  }
-
-  /**
-   * list a promotionalCredit using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public PromotionalCreditListResponse list(PromotionalCreditListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return PromotionalCreditListResponse.fromJson(
-        response.getBodyAsString(), this, params, response);
-  }
-
-  public PromotionalCreditListResponse list() throws Exception {
-    Response response = listRaw();
-    return PromotionalCreditListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /**
-   * deduct a promotionalCredit using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response deductRaw(PromotionalCreditDeductParams params) throws Exception {
-
-    return post("/promotional_credits/deduct", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * deduct a promotionalCredit using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response deductRaw(String jsonPayload) throws Exception {
-
-    return postJson("/promotional_credits/deduct", jsonPayload);
-  }
-
-  public PromotionalCreditDeductResponse deduct(PromotionalCreditDeductParams params)
-      throws Exception {
-    Response response = deductRaw(params);
-
-    return PromotionalCreditDeductResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * set a promotionalCredit using immutable params (executes immediately) - returns raw Response.
-   */
-  Response setRaw(PromotionalCreditSetParams params) throws Exception {
-
-    return post("/promotional_credits/set", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * set a promotionalCredit using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response setRaw(String jsonPayload) throws Exception {
-
-    return postJson("/promotional_credits/set", jsonPayload);
-  }
-
-  public PromotionalCreditSetResponse set(PromotionalCreditSetParams params) throws Exception {
-    Response response = setRaw(params);
-
-    return PromotionalCreditSetResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * add a promotionalCredit using immutable params (executes immediately) - returns raw Response.
-   */
-  Response addRaw(PromotionalCreditAddParams params) throws Exception {
-
-    return post("/promotional_credits/add", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * add a promotionalCredit using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response addRaw(String jsonPayload) throws Exception {
-
-    return postJson("/promotional_credits/add", jsonPayload);
-  }
-
-  public PromotionalCreditAddResponse add(PromotionalCreditAddParams params) throws Exception {
-    Response response = addRaw(params);
-
-    return PromotionalCreditAddResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/QuoteService.java b/src/main/java/com/chargebee/v4/core/services/QuoteService.java
deleted file mode 100644
index 44e82e1e..00000000
--- a/src/main/java/com/chargebee/v4/core/services/QuoteService.java
+++ /dev/null
@@ -1,752 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.quote.params.QuoteCreateSubItemsForCustomerQuoteParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteEditCreateSubCustomerQuoteForItemsParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteUpdateStatusParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteUpdateSubscriptionQuoteForItemsParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteQuoteLineGroupsForQuoteParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteExtendExpiryDateParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteEditForChargeItemsAndChargesParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteEditUpdateSubscriptionQuoteForItemsParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteListParams;
-
-import com.chargebee.v4.core.models.quote.params.QuotePdfParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteConvertParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteCreateForChargeItemsAndChargesParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteDeleteParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteEditOneTimeQuoteParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteUpdateSubscriptionQuoteParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteCreateForOnetimeChargesParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteCreateSubForCustomerQuoteParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteEditUpdateSubscriptionQuoteParams;
-
-import com.chargebee.v4.core.models.quote.params.QuoteEditCreateSubForCustomerQuoteParams;
-
-import com.chargebee.v4.core.responses.quote.QuoteCreateSubItemsForCustomerQuoteResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteRetrieveResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteEditCreateSubCustomerQuoteForItemsResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteUpdateStatusResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteUpdateSubscriptionQuoteForItemsResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteQuoteLineGroupsForQuoteResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteExtendExpiryDateResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteEditForChargeItemsAndChargesResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteEditUpdateSubscriptionQuoteForItemsResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteListResponse;
-
-import com.chargebee.v4.core.responses.quote.QuotePdfResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteConvertResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteCreateForChargeItemsAndChargesResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteDeleteResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteEditOneTimeQuoteResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteUpdateSubscriptionQuoteResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteCreateForOnetimeChargesResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteCreateSubForCustomerQuoteResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteEditUpdateSubscriptionQuoteResponse;
-
-import com.chargebee.v4.core.responses.quote.QuoteEditCreateSubForCustomerQuoteResponse;
-
-public final class QuoteService extends BaseService<QuoteService> {
-
-  private final ServiceConfig config;
-
-  public QuoteService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private QuoteService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private QuoteService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  QuoteService with(RequestOptions newOptions) {
-    return new QuoteService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public QuoteService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** createSubItemsForCustomerQuote a quote (executes immediately) - returns raw Response. */
-  Response createSubItemsForCustomerQuoteRaw(String customerId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/customers/{customer-id}/create_subscription_quote_for_items",
-            "customer-id",
-            customerId);
-
-    return post(path, null);
-  }
-
-  /**
-   * createSubItemsForCustomerQuote a quote using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response createSubItemsForCustomerQuoteRaw(
-      String customerId, QuoteCreateSubItemsForCustomerQuoteParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/customers/{customer-id}/create_subscription_quote_for_items",
-            "customer-id",
-            customerId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * createSubItemsForCustomerQuote a quote using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response createSubItemsForCustomerQuoteRaw(String customerId, String jsonPayload)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/customers/{customer-id}/create_subscription_quote_for_items",
-            "customer-id",
-            customerId);
-    return postJson(path, jsonPayload);
-  }
-
-  public QuoteCreateSubItemsForCustomerQuoteResponse createSubItemsForCustomerQuote(
-      String customerId, QuoteCreateSubItemsForCustomerQuoteParams params) throws Exception {
-    Response response = createSubItemsForCustomerQuoteRaw(customerId, params);
-    return QuoteCreateSubItemsForCustomerQuoteResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /** retrieve a quote (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String quoteId) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}", "quote-id", quoteId);
-
-    return get(path, null);
-  }
-
-  public QuoteRetrieveResponse retrieve(String quoteId) throws Exception {
-    Response response = retrieveRaw(quoteId);
-    return QuoteRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** editCreateSubCustomerQuoteForItems a quote (executes immediately) - returns raw Response. */
-  Response editCreateSubCustomerQuoteForItemsRaw(String quoteId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_create_subscription_quote_for_items", "quote-id", quoteId);
-
-    return post(path, null);
-  }
-
-  /**
-   * editCreateSubCustomerQuoteForItems a quote using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response editCreateSubCustomerQuoteForItemsRaw(
-      String quoteId, QuoteEditCreateSubCustomerQuoteForItemsParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_create_subscription_quote_for_items", "quote-id", quoteId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * editCreateSubCustomerQuoteForItems a quote using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response editCreateSubCustomerQuoteForItemsRaw(String quoteId, String jsonPayload)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_create_subscription_quote_for_items", "quote-id", quoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public QuoteEditCreateSubCustomerQuoteForItemsResponse editCreateSubCustomerQuoteForItems(
-      String quoteId, QuoteEditCreateSubCustomerQuoteForItemsParams params) throws Exception {
-    Response response = editCreateSubCustomerQuoteForItemsRaw(quoteId, params);
-    return QuoteEditCreateSubCustomerQuoteForItemsResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /** updateStatus a quote (executes immediately) - returns raw Response. */
-  Response updateStatusRaw(String quoteId) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/update_status", "quote-id", quoteId);
-
-    return post(path, null);
-  }
-
-  /** updateStatus a quote using immutable params (executes immediately) - returns raw Response. */
-  Response updateStatusRaw(String quoteId, QuoteUpdateStatusParams params) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/update_status", "quote-id", quoteId);
-    return post(path, params.toFormData());
-  }
-
-  /** updateStatus a quote using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateStatusRaw(String quoteId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/update_status", "quote-id", quoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public QuoteUpdateStatusResponse updateStatus(String quoteId, QuoteUpdateStatusParams params)
-      throws Exception {
-    Response response = updateStatusRaw(quoteId, params);
-    return QuoteUpdateStatusResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * updateSubscriptionQuoteForItems a quote using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response updateSubscriptionQuoteForItemsRaw(QuoteUpdateSubscriptionQuoteForItemsParams params)
-      throws Exception {
-
-    return post(
-        "/quotes/update_subscription_quote_for_items", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * updateSubscriptionQuoteForItems a quote using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response updateSubscriptionQuoteForItemsRaw(String jsonPayload) throws Exception {
-
-    return postJson("/quotes/update_subscription_quote_for_items", jsonPayload);
-  }
-
-  public QuoteUpdateSubscriptionQuoteForItemsResponse updateSubscriptionQuoteForItems(
-      QuoteUpdateSubscriptionQuoteForItemsParams params) throws Exception {
-    Response response = updateSubscriptionQuoteForItemsRaw(params);
-
-    return QuoteUpdateSubscriptionQuoteForItemsResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /**
-   * quoteLineGroupsForQuote a quote using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response quoteLineGroupsForQuoteRaw(String quoteId, QuoteQuoteLineGroupsForQuoteParams params)
-      throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/quote_line_groups", "quote-id", quoteId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * quoteLineGroupsForQuote a quote without params (executes immediately) - returns raw Response.
-   */
-  Response quoteLineGroupsForQuoteRaw(String quoteId) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/quote_line_groups", "quote-id", quoteId);
-    return get(path, null);
-  }
-
-  /**
-   * quoteLineGroupsForQuote a quote using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response quoteLineGroupsForQuoteRaw(String quoteId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/quote_line_groups", "quote-id", quoteId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public QuoteQuoteLineGroupsForQuoteResponse quoteLineGroupsForQuote(
-      String quoteId, QuoteQuoteLineGroupsForQuoteParams params) throws Exception {
-    Response response = quoteLineGroupsForQuoteRaw(quoteId, params);
-    return QuoteQuoteLineGroupsForQuoteResponse.fromJson(
-        response.getBodyAsString(), this, params, quoteId, response);
-  }
-
-  public QuoteQuoteLineGroupsForQuoteResponse quoteLineGroupsForQuote(String quoteId)
-      throws Exception {
-    Response response = quoteLineGroupsForQuoteRaw(quoteId);
-    return QuoteQuoteLineGroupsForQuoteResponse.fromJson(
-        response.getBodyAsString(), this, null, quoteId, response);
-  }
-
-  /** extendExpiryDate a quote (executes immediately) - returns raw Response. */
-  Response extendExpiryDateRaw(String quoteId) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/extend_expiry_date", "quote-id", quoteId);
-
-    return post(path, null);
-  }
-
-  /**
-   * extendExpiryDate a quote using immutable params (executes immediately) - returns raw Response.
-   */
-  Response extendExpiryDateRaw(String quoteId, QuoteExtendExpiryDateParams params)
-      throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/extend_expiry_date", "quote-id", quoteId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * extendExpiryDate a quote using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response extendExpiryDateRaw(String quoteId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/extend_expiry_date", "quote-id", quoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public QuoteExtendExpiryDateResponse extendExpiryDate(
-      String quoteId, QuoteExtendExpiryDateParams params) throws Exception {
-    Response response = extendExpiryDateRaw(quoteId, params);
-    return QuoteExtendExpiryDateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** editForChargeItemsAndCharges a quote (executes immediately) - returns raw Response. */
-  Response editForChargeItemsAndChargesRaw(String quoteId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_for_charge_items_and_charges", "quote-id", quoteId);
-
-    return post(path, null);
-  }
-
-  /**
-   * editForChargeItemsAndCharges a quote using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response editForChargeItemsAndChargesRaw(
-      String quoteId, QuoteEditForChargeItemsAndChargesParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_for_charge_items_and_charges", "quote-id", quoteId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * editForChargeItemsAndCharges a quote using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response editForChargeItemsAndChargesRaw(String quoteId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_for_charge_items_and_charges", "quote-id", quoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public QuoteEditForChargeItemsAndChargesResponse editForChargeItemsAndCharges(
-      String quoteId, QuoteEditForChargeItemsAndChargesParams params) throws Exception {
-    Response response = editForChargeItemsAndChargesRaw(quoteId, params);
-    return QuoteEditForChargeItemsAndChargesResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** editUpdateSubscriptionQuoteForItems a quote (executes immediately) - returns raw Response. */
-  Response editUpdateSubscriptionQuoteForItemsRaw(String quoteId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_update_subscription_quote_for_items", "quote-id", quoteId);
-
-    return post(path, null);
-  }
-
-  /**
-   * editUpdateSubscriptionQuoteForItems a quote using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response editUpdateSubscriptionQuoteForItemsRaw(
-      String quoteId, QuoteEditUpdateSubscriptionQuoteForItemsParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_update_subscription_quote_for_items", "quote-id", quoteId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * editUpdateSubscriptionQuoteForItems a quote using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response editUpdateSubscriptionQuoteForItemsRaw(String quoteId, String jsonPayload)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_update_subscription_quote_for_items", "quote-id", quoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public QuoteEditUpdateSubscriptionQuoteForItemsResponse editUpdateSubscriptionQuoteForItems(
-      String quoteId, QuoteEditUpdateSubscriptionQuoteForItemsParams params) throws Exception {
-    Response response = editUpdateSubscriptionQuoteForItemsRaw(quoteId, params);
-    return QuoteEditUpdateSubscriptionQuoteForItemsResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /** list a quote using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(QuoteListParams params) throws Exception {
-
-    return get("/quotes", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a quote without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/quotes", null);
-  }
-
-  /** list a quote using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public QuoteListResponse list(QuoteListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return QuoteListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public QuoteListResponse list() throws Exception {
-    Response response = listRaw();
-    return QuoteListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** pdf a quote (executes immediately) - returns raw Response. */
-  Response pdfRaw(String quoteId) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/pdf", "quote-id", quoteId);
-
-    return post(path, null);
-  }
-
-  /** pdf a quote using immutable params (executes immediately) - returns raw Response. */
-  Response pdfRaw(String quoteId, QuotePdfParams params) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/pdf", "quote-id", quoteId);
-    return post(path, params.toFormData());
-  }
-
-  /** pdf a quote using raw JSON payload (executes immediately) - returns raw Response. */
-  Response pdfRaw(String quoteId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/pdf", "quote-id", quoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public QuotePdfResponse pdf(String quoteId, QuotePdfParams params) throws Exception {
-    Response response = pdfRaw(quoteId, params);
-    return QuotePdfResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** convert a quote (executes immediately) - returns raw Response. */
-  Response convertRaw(String quoteId) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/convert", "quote-id", quoteId);
-
-    return post(path, null);
-  }
-
-  /** convert a quote using immutable params (executes immediately) - returns raw Response. */
-  Response convertRaw(String quoteId, QuoteConvertParams params) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/convert", "quote-id", quoteId);
-    return post(path, params.toFormData());
-  }
-
-  /** convert a quote using raw JSON payload (executes immediately) - returns raw Response. */
-  Response convertRaw(String quoteId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/convert", "quote-id", quoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public QuoteConvertResponse convert(String quoteId, QuoteConvertParams params) throws Exception {
-    Response response = convertRaw(quoteId, params);
-    return QuoteConvertResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createForChargeItemsAndCharges a quote using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response createForChargeItemsAndChargesRaw(QuoteCreateForChargeItemsAndChargesParams params)
-      throws Exception {
-
-    return post(
-        "/quotes/create_for_charge_items_and_charges", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createForChargeItemsAndCharges a quote using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response createForChargeItemsAndChargesRaw(String jsonPayload) throws Exception {
-
-    return postJson("/quotes/create_for_charge_items_and_charges", jsonPayload);
-  }
-
-  public QuoteCreateForChargeItemsAndChargesResponse createForChargeItemsAndCharges(
-      QuoteCreateForChargeItemsAndChargesParams params) throws Exception {
-    Response response = createForChargeItemsAndChargesRaw(params);
-
-    return QuoteCreateForChargeItemsAndChargesResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /** delete a quote (executes immediately) - returns raw Response. */
-  Response deleteRaw(String quoteId) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/delete", "quote-id", quoteId);
-
-    return post(path, null);
-  }
-
-  /** delete a quote using immutable params (executes immediately) - returns raw Response. */
-  Response deleteRaw(String quoteId, QuoteDeleteParams params) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/delete", "quote-id", quoteId);
-    return post(path, params.toFormData());
-  }
-
-  /** delete a quote using raw JSON payload (executes immediately) - returns raw Response. */
-  Response deleteRaw(String quoteId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/quotes/{quote-id}/delete", "quote-id", quoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public QuoteDeleteResponse delete(String quoteId, QuoteDeleteParams params) throws Exception {
-    Response response = deleteRaw(quoteId, params);
-    return QuoteDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** editOneTimeQuote a quote (executes immediately) - returns raw Response. */
-  Response editOneTimeQuoteRaw(String quoteId) throws Exception {
-    String path =
-        buildPathWithParams("/quotes/{quote-id}/edit_one_time_quote", "quote-id", quoteId);
-
-    return post(path, null);
-  }
-
-  /**
-   * editOneTimeQuote a quote using immutable params (executes immediately) - returns raw Response.
-   */
-  Response editOneTimeQuoteRaw(String quoteId, QuoteEditOneTimeQuoteParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams("/quotes/{quote-id}/edit_one_time_quote", "quote-id", quoteId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * editOneTimeQuote a quote using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response editOneTimeQuoteRaw(String quoteId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/quotes/{quote-id}/edit_one_time_quote", "quote-id", quoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public QuoteEditOneTimeQuoteResponse editOneTimeQuote(
-      String quoteId, QuoteEditOneTimeQuoteParams params) throws Exception {
-    Response response = editOneTimeQuoteRaw(quoteId, params);
-    return QuoteEditOneTimeQuoteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * updateSubscriptionQuote a quote using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response updateSubscriptionQuoteRaw(QuoteUpdateSubscriptionQuoteParams params) throws Exception {
-
-    return post("/quotes/update_subscription_quote", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * updateSubscriptionQuote a quote using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response updateSubscriptionQuoteRaw(String jsonPayload) throws Exception {
-
-    return postJson("/quotes/update_subscription_quote", jsonPayload);
-  }
-
-  public QuoteUpdateSubscriptionQuoteResponse updateSubscriptionQuote(
-      QuoteUpdateSubscriptionQuoteParams params) throws Exception {
-    Response response = updateSubscriptionQuoteRaw(params);
-
-    return QuoteUpdateSubscriptionQuoteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createForOnetimeCharges a quote using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createForOnetimeChargesRaw(QuoteCreateForOnetimeChargesParams params) throws Exception {
-
-    return post("/quotes/create_for_onetime_charges", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createForOnetimeCharges a quote using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createForOnetimeChargesRaw(String jsonPayload) throws Exception {
-
-    return postJson("/quotes/create_for_onetime_charges", jsonPayload);
-  }
-
-  public QuoteCreateForOnetimeChargesResponse createForOnetimeCharges(
-      QuoteCreateForOnetimeChargesParams params) throws Exception {
-    Response response = createForOnetimeChargesRaw(params);
-
-    return QuoteCreateForOnetimeChargesResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** createSubForCustomerQuote a quote (executes immediately) - returns raw Response. */
-  Response createSubForCustomerQuoteRaw(String customerId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/customers/{customer-id}/create_subscription_quote", "customer-id", customerId);
-
-    return post(path, null);
-  }
-
-  /**
-   * createSubForCustomerQuote a quote using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createSubForCustomerQuoteRaw(
-      String customerId, QuoteCreateSubForCustomerQuoteParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/customers/{customer-id}/create_subscription_quote", "customer-id", customerId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * createSubForCustomerQuote a quote using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createSubForCustomerQuoteRaw(String customerId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/customers/{customer-id}/create_subscription_quote", "customer-id", customerId);
-    return postJson(path, jsonPayload);
-  }
-
-  public QuoteCreateSubForCustomerQuoteResponse createSubForCustomerQuote(
-      String customerId, QuoteCreateSubForCustomerQuoteParams params) throws Exception {
-    Response response = createSubForCustomerQuoteRaw(customerId, params);
-    return QuoteCreateSubForCustomerQuoteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** editUpdateSubscriptionQuote a quote (executes immediately) - returns raw Response. */
-  Response editUpdateSubscriptionQuoteRaw(String quoteId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_update_subscription_quote", "quote-id", quoteId);
-
-    return post(path, null);
-  }
-
-  /**
-   * editUpdateSubscriptionQuote a quote using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response editUpdateSubscriptionQuoteRaw(
-      String quoteId, QuoteEditUpdateSubscriptionQuoteParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_update_subscription_quote", "quote-id", quoteId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * editUpdateSubscriptionQuote a quote using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response editUpdateSubscriptionQuoteRaw(String quoteId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_update_subscription_quote", "quote-id", quoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public QuoteEditUpdateSubscriptionQuoteResponse editUpdateSubscriptionQuote(
-      String quoteId, QuoteEditUpdateSubscriptionQuoteParams params) throws Exception {
-    Response response = editUpdateSubscriptionQuoteRaw(quoteId, params);
-    return QuoteEditUpdateSubscriptionQuoteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** editCreateSubForCustomerQuote a quote (executes immediately) - returns raw Response. */
-  Response editCreateSubForCustomerQuoteRaw(String quoteId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_create_subscription_quote", "quote-id", quoteId);
-
-    return post(path, null);
-  }
-
-  /**
-   * editCreateSubForCustomerQuote a quote using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response editCreateSubForCustomerQuoteRaw(
-      String quoteId, QuoteEditCreateSubForCustomerQuoteParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_create_subscription_quote", "quote-id", quoteId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * editCreateSubForCustomerQuote a quote using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response editCreateSubForCustomerQuoteRaw(String quoteId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/quotes/{quote-id}/edit_create_subscription_quote", "quote-id", quoteId);
-    return postJson(path, jsonPayload);
-  }
-
-  public QuoteEditCreateSubForCustomerQuoteResponse editCreateSubForCustomerQuote(
-      String quoteId, QuoteEditCreateSubForCustomerQuoteParams params) throws Exception {
-    Response response = editCreateSubForCustomerQuoteRaw(quoteId, params);
-    return QuoteEditCreateSubForCustomerQuoteResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/SubscriptionEntitlementService.java b/src/main/java/com/chargebee/v4/core/services/SubscriptionEntitlementService.java
deleted file mode 100644
index 4507974b..00000000
--- a/src/main/java/com/chargebee/v4/core/services/SubscriptionEntitlementService.java
+++ /dev/null
@@ -1,171 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.subscriptionEntitlement.params.SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityParams;
-
-import com.chargebee.v4.core.models.subscriptionEntitlement.params.SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams;
-
-import com.chargebee.v4.core.responses.subscriptionEntitlement.SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse;
-
-import com.chargebee.v4.core.responses.subscriptionEntitlement.SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse;
-
-public final class SubscriptionEntitlementService
-    extends BaseService<SubscriptionEntitlementService> {
-
-  private final ServiceConfig config;
-
-  public SubscriptionEntitlementService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private SubscriptionEntitlementService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private SubscriptionEntitlementService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  SubscriptionEntitlementService with(RequestOptions newOptions) {
-    return new SubscriptionEntitlementService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public SubscriptionEntitlementService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /**
-   * setSubscriptionEntitlementAvailability a subscriptionEntitlement (executes immediately) -
-   * returns raw Response.
-   */
-  Response setSubscriptionEntitlementAvailabilityRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/subscription_entitlements/set_availability",
-            "subscription-id",
-            subscriptionId);
-
-    return post(path, null);
-  }
-
-  /**
-   * setSubscriptionEntitlementAvailability a subscriptionEntitlement using immutable params
-   * (executes immediately) - returns raw Response.
-   */
-  Response setSubscriptionEntitlementAvailabilityRaw(
-      String subscriptionId,
-      SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/subscription_entitlements/set_availability",
-            "subscription-id",
-            subscriptionId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * setSubscriptionEntitlementAvailability a subscriptionEntitlement using raw JSON payload
-   * (executes immediately) - returns raw Response.
-   */
-  Response setSubscriptionEntitlementAvailabilityRaw(String subscriptionId, String jsonPayload)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/subscription_entitlements/set_availability",
-            "subscription-id",
-            subscriptionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse
-      setSubscriptionEntitlementAvailability(
-          String subscriptionId,
-          SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityParams params)
-          throws Exception {
-    Response response = setSubscriptionEntitlementAvailabilityRaw(subscriptionId, params);
-    return SubscriptionEntitlementSetSubscriptionEntitlementAvailabilityResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /**
-   * subscriptionEntitlementsForSubscription a subscriptionEntitlement using immutable params
-   * (executes immediately) - returns raw Response.
-   */
-  Response subscriptionEntitlementsForSubscriptionRaw(
-      String subscriptionId,
-      SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/subscription_entitlements",
-            "subscription-id",
-            subscriptionId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * subscriptionEntitlementsForSubscription a subscriptionEntitlement without params (executes
-   * immediately) - returns raw Response.
-   */
-  Response subscriptionEntitlementsForSubscriptionRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/subscription_entitlements",
-            "subscription-id",
-            subscriptionId);
-    return get(path, null);
-  }
-
-  /**
-   * subscriptionEntitlementsForSubscription a subscriptionEntitlement using raw JSON payload
-   * (executes immediately) - returns raw Response.
-   */
-  Response subscriptionEntitlementsForSubscriptionRaw(String subscriptionId, String jsonPayload)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/subscription_entitlements",
-            "subscription-id",
-            subscriptionId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse
-      subscriptionEntitlementsForSubscription(
-          String subscriptionId,
-          SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionParams params)
-          throws Exception {
-    Response response = subscriptionEntitlementsForSubscriptionRaw(subscriptionId, params);
-    return SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse.fromJson(
-        response.getBodyAsString(), this, params, subscriptionId, response);
-  }
-
-  public SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse
-      subscriptionEntitlementsForSubscription(String subscriptionId) throws Exception {
-    Response response = subscriptionEntitlementsForSubscriptionRaw(subscriptionId);
-    return SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionResponse.fromJson(
-        response.getBodyAsString(), this, null, subscriptionId, response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/ThirdPartyEntityMappingService.java b/src/main/java/com/chargebee/v4/core/services/ThirdPartyEntityMappingService.java
deleted file mode 100644
index 9ea477da..00000000
--- a/src/main/java/com/chargebee/v4/core/services/ThirdPartyEntityMappingService.java
+++ /dev/null
@@ -1,185 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.thirdPartyEntityMapping.params.ThirdPartyEntityMappingRetrieveEntityParams;
-
-import com.chargebee.v4.core.models.thirdPartyEntityMapping.params.ThirdPartyEntityMappingListAllParams;
-
-import com.chargebee.v4.core.models.thirdPartyEntityMapping.params.ThirdPartyEntityMappingUpdateEntityParams;
-
-import com.chargebee.v4.core.models.thirdPartyEntityMapping.params.ThirdPartyEntityMappingListParams;
-
-import com.chargebee.v4.core.responses.thirdPartyEntityMapping.ThirdPartyEntityMappingRetrieveEntityResponse;
-
-import com.chargebee.v4.core.responses.thirdPartyEntityMapping.ThirdPartyEntityMappingListAllResponse;
-
-import com.chargebee.v4.core.responses.thirdPartyEntityMapping.ThirdPartyEntityMappingUpdateEntityResponse;
-
-import com.chargebee.v4.core.responses.thirdPartyEntityMapping.ThirdPartyEntityMappingListResponse;
-
-public final class ThirdPartyEntityMappingService
-    extends BaseService<ThirdPartyEntityMappingService> {
-
-  private final ServiceConfig config;
-
-  public ThirdPartyEntityMappingService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private ThirdPartyEntityMappingService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private ThirdPartyEntityMappingService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  ThirdPartyEntityMappingService with(RequestOptions newOptions) {
-    return new ThirdPartyEntityMappingService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public ThirdPartyEntityMappingService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /**
-   * retrieveEntity a thirdPartyEntityMapping using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response retrieveEntityRaw(ThirdPartyEntityMappingRetrieveEntityParams params) throws Exception {
-
-    return get(
-        "/third_party_entity_mappings/retrieve", params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * retrieveEntity a thirdPartyEntityMapping using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response retrieveEntityRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public ThirdPartyEntityMappingRetrieveEntityResponse retrieveEntity(
-      ThirdPartyEntityMappingRetrieveEntityParams params) throws Exception {
-    Response response = retrieveEntityRaw(params);
-
-    return ThirdPartyEntityMappingRetrieveEntityResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /**
-   * listAll a thirdPartyEntityMapping using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response listAllRaw(ThirdPartyEntityMappingListAllParams params) throws Exception {
-
-    return get(
-        "/third_party_entity_mappings/list_all", params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * listAll a thirdPartyEntityMapping using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response listAllRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public ThirdPartyEntityMappingListAllResponse listAll(ThirdPartyEntityMappingListAllParams params)
-      throws Exception {
-    Response response = listAllRaw(params);
-
-    return ThirdPartyEntityMappingListAllResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * updateEntity a thirdPartyEntityMapping using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response updateEntityRaw(ThirdPartyEntityMappingUpdateEntityParams params) throws Exception {
-
-    return post(
-        "/third_party_entity_mappings/update_entity", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * updateEntity a thirdPartyEntityMapping using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response updateEntityRaw(String jsonPayload) throws Exception {
-
-    return postJson("/third_party_entity_mappings/update_entity", jsonPayload);
-  }
-
-  public ThirdPartyEntityMappingUpdateEntityResponse updateEntity(
-      ThirdPartyEntityMappingUpdateEntityParams params) throws Exception {
-    Response response = updateEntityRaw(params);
-
-    return ThirdPartyEntityMappingUpdateEntityResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /**
-   * list a thirdPartyEntityMapping using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response listRaw(ThirdPartyEntityMappingListParams params) throws Exception {
-
-    return get("/third_party_entity_mappings", params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * list a thirdPartyEntityMapping without params (executes immediately) - returns raw Response.
-   */
-  Response listRaw() throws Exception {
-
-    return get("/third_party_entity_mappings", null);
-  }
-
-  /**
-   * list a thirdPartyEntityMapping using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public ThirdPartyEntityMappingListResponse list(ThirdPartyEntityMappingListParams params)
-      throws Exception {
-    Response response = listRaw(params);
-
-    return ThirdPartyEntityMappingListResponse.fromJson(
-        response.getBodyAsString(), this, params, response);
-  }
-
-  public ThirdPartyEntityMappingListResponse list() throws Exception {
-    Response response = listRaw();
-    return ThirdPartyEntityMappingListResponse.fromJson(
-        response.getBodyAsString(), this, null, response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/TpSiteUserService.java b/src/main/java/com/chargebee/v4/core/services/TpSiteUserService.java
deleted file mode 100644
index 4c085d6a..00000000
--- a/src/main/java/com/chargebee/v4/core/services/TpSiteUserService.java
+++ /dev/null
@@ -1,178 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.tpSiteUser.params.TpSiteUserUsersForTpSiteUserParams;
-
-import com.chargebee.v4.core.models.tpSiteUser.params.TpSiteUserPayNowEnableLiveParams;
-
-import com.chargebee.v4.core.models.tpSiteUser.params.TpSiteUserGuestsForTpSiteUserParams;
-
-import com.chargebee.v4.core.responses.tpSiteUser.TpSiteUserUsersForTpSiteUserResponse;
-
-import com.chargebee.v4.core.responses.tpSiteUser.TpSiteUserPayNowEnableLiveResponse;
-
-import com.chargebee.v4.core.responses.tpSiteUser.TpSiteUserGuestsForTpSiteUserResponse;
-
-public final class TpSiteUserService extends BaseService<TpSiteUserService> {
-
-  private final ServiceConfig config;
-
-  public TpSiteUserService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private TpSiteUserService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private TpSiteUserService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  TpSiteUserService with(RequestOptions newOptions) {
-    return new TpSiteUserService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public TpSiteUserService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /**
-   * usersForTpSiteUser a tpSiteUser using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response usersForTpSiteUserRaw(String tpSiteUserDomain, TpSiteUserUsersForTpSiteUserParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/tp_site_users/{tp-site-user-domain}/users", "tp-site-user-domain", tpSiteUserDomain);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * usersForTpSiteUser a tpSiteUser without params (executes immediately) - returns raw Response.
-   */
-  Response usersForTpSiteUserRaw(String tpSiteUserDomain) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/tp_site_users/{tp-site-user-domain}/users", "tp-site-user-domain", tpSiteUserDomain);
-    return get(path, null);
-  }
-
-  /**
-   * usersForTpSiteUser a tpSiteUser using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response usersForTpSiteUserRaw(String tpSiteUserDomain, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/tp_site_users/{tp-site-user-domain}/users", "tp-site-user-domain", tpSiteUserDomain);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public TpSiteUserUsersForTpSiteUserResponse usersForTpSiteUser(
-      String tpSiteUserDomain, TpSiteUserUsersForTpSiteUserParams params) throws Exception {
-    Response response = usersForTpSiteUserRaw(tpSiteUserDomain, params);
-    return TpSiteUserUsersForTpSiteUserResponse.fromJson(
-        response.getBodyAsString(), this, params, tpSiteUserDomain, response);
-  }
-
-  public TpSiteUserUsersForTpSiteUserResponse usersForTpSiteUser(String tpSiteUserDomain)
-      throws Exception {
-    Response response = usersForTpSiteUserRaw(tpSiteUserDomain);
-    return TpSiteUserUsersForTpSiteUserResponse.fromJson(
-        response.getBodyAsString(), this, null, tpSiteUserDomain, response);
-  }
-
-  /**
-   * payNowEnableLive a tpSiteUser using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response payNowEnableLiveRaw(TpSiteUserPayNowEnableLiveParams params) throws Exception {
-
-    return post("/tp_site_users/pay_now_enable_live", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * payNowEnableLive a tpSiteUser using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response payNowEnableLiveRaw(String jsonPayload) throws Exception {
-
-    return postJson("/tp_site_users/pay_now_enable_live", jsonPayload);
-  }
-
-  public TpSiteUserPayNowEnableLiveResponse payNowEnableLive(
-      TpSiteUserPayNowEnableLiveParams params) throws Exception {
-    Response response = payNowEnableLiveRaw(params);
-
-    return TpSiteUserPayNowEnableLiveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * guestsForTpSiteUser a tpSiteUser using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response guestsForTpSiteUserRaw(
-      String tpSiteUserDomain, TpSiteUserGuestsForTpSiteUserParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/tp_site_users/{tp-site-user-domain}/guests", "tp-site-user-domain", tpSiteUserDomain);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * guestsForTpSiteUser a tpSiteUser without params (executes immediately) - returns raw Response.
-   */
-  Response guestsForTpSiteUserRaw(String tpSiteUserDomain) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/tp_site_users/{tp-site-user-domain}/guests", "tp-site-user-domain", tpSiteUserDomain);
-    return get(path, null);
-  }
-
-  /**
-   * guestsForTpSiteUser a tpSiteUser using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response guestsForTpSiteUserRaw(String tpSiteUserDomain, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/tp_site_users/{tp-site-user-domain}/guests", "tp-site-user-domain", tpSiteUserDomain);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public TpSiteUserGuestsForTpSiteUserResponse guestsForTpSiteUser(
-      String tpSiteUserDomain, TpSiteUserGuestsForTpSiteUserParams params) throws Exception {
-    Response response = guestsForTpSiteUserRaw(tpSiteUserDomain, params);
-    return TpSiteUserGuestsForTpSiteUserResponse.fromJson(
-        response.getBodyAsString(), this, params, tpSiteUserDomain, response);
-  }
-
-  public TpSiteUserGuestsForTpSiteUserResponse guestsForTpSiteUser(String tpSiteUserDomain)
-      throws Exception {
-    Response response = guestsForTpSiteUserRaw(tpSiteUserDomain);
-    return TpSiteUserGuestsForTpSiteUserResponse.fromJson(
-        response.getBodyAsString(), this, null, tpSiteUserDomain, response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/TransactionService.java b/src/main/java/com/chargebee/v4/core/services/TransactionService.java
deleted file mode 100644
index 37fd494e..00000000
--- a/src/main/java/com/chargebee/v4/core/services/TransactionService.java
+++ /dev/null
@@ -1,466 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.transaction.params.TransactionListParams;
-
-import com.chargebee.v4.core.models.transaction.params.TransactionReconcileParams;
-
-import com.chargebee.v4.core.models.transaction.params.TransactionRefundParams;
-
-import com.chargebee.v4.core.models.transaction.params.TransactionTransactionsForCustomerParams;
-
-import com.chargebee.v4.core.models.transaction.params.TransactionRecordRefundParams;
-
-import com.chargebee.v4.core.models.transaction.params.TransactionTransactionsForSubscriptionParams;
-
-import com.chargebee.v4.core.models.transaction.params.TransactionCreateAuthorizationParams;
-
-import com.chargebee.v4.core.models.transaction.params.TransactionPaymentsForInvoiceParams;
-
-import com.chargebee.v4.core.models.transaction.params.TransactionDeleteOfflineTransactionParams;
-
-import com.chargebee.v4.core.responses.transaction.TransactionListResponse;
-
-import com.chargebee.v4.core.responses.transaction.TransactionReconcileResponse;
-
-import com.chargebee.v4.core.responses.transaction.TransactionRetrieveResponse;
-
-import com.chargebee.v4.core.responses.transaction.TransactionRefundResponse;
-
-import com.chargebee.v4.core.responses.transaction.TransactionTransactionsForCustomerResponse;
-
-import com.chargebee.v4.core.responses.transaction.TransactionRecordRefundResponse;
-
-import com.chargebee.v4.core.responses.transaction.TransactionTransactionsForSubscriptionResponse;
-
-import com.chargebee.v4.core.responses.transaction.TransactionVoidTransactionResponse;
-
-import com.chargebee.v4.core.responses.transaction.TransactionSyncTransactionResponse;
-
-import com.chargebee.v4.core.responses.transaction.TransactionCreateAuthorizationResponse;
-
-import com.chargebee.v4.core.responses.transaction.TransactionPaymentsForInvoiceResponse;
-
-import com.chargebee.v4.core.responses.transaction.TransactionDeleteOfflineTransactionResponse;
-
-public final class TransactionService extends BaseService<TransactionService> {
-
-  private final ServiceConfig config;
-
-  public TransactionService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private TransactionService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private TransactionService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  TransactionService with(RequestOptions newOptions) {
-    return new TransactionService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public TransactionService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** list a transaction using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(TransactionListParams params) throws Exception {
-
-    return get("/transactions", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a transaction without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/transactions", null);
-  }
-
-  /** list a transaction using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public TransactionListResponse list(TransactionListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return TransactionListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public TransactionListResponse list() throws Exception {
-    Response response = listRaw();
-    return TransactionListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /** reconcile a transaction (executes immediately) - returns raw Response. */
-  Response reconcileRaw(String transactionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/transactions/{transaction-id}/reconcile", "transaction-id", transactionId);
-
-    return post(path, null);
-  }
-
-  /**
-   * reconcile a transaction using immutable params (executes immediately) - returns raw Response.
-   */
-  Response reconcileRaw(String transactionId, TransactionReconcileParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/transactions/{transaction-id}/reconcile", "transaction-id", transactionId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * reconcile a transaction using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response reconcileRaw(String transactionId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/transactions/{transaction-id}/reconcile", "transaction-id", transactionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public TransactionReconcileResponse reconcile(
-      String transactionId, TransactionReconcileParams params) throws Exception {
-    Response response = reconcileRaw(transactionId, params);
-    return TransactionReconcileResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a transaction (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String transactionId) throws Exception {
-    String path =
-        buildPathWithParams("/transactions/{transaction-id}", "transaction-id", transactionId);
-
-    return get(path, null);
-  }
-
-  public TransactionRetrieveResponse retrieve(String transactionId) throws Exception {
-    Response response = retrieveRaw(transactionId);
-    return TransactionRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** refund a transaction (executes immediately) - returns raw Response. */
-  Response refundRaw(String transactionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/transactions/{transaction-id}/refund", "transaction-id", transactionId);
-
-    return post(path, null);
-  }
-
-  /** refund a transaction using immutable params (executes immediately) - returns raw Response. */
-  Response refundRaw(String transactionId, TransactionRefundParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/transactions/{transaction-id}/refund", "transaction-id", transactionId);
-    return post(path, params.toFormData());
-  }
-
-  /** refund a transaction using raw JSON payload (executes immediately) - returns raw Response. */
-  Response refundRaw(String transactionId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/transactions/{transaction-id}/refund", "transaction-id", transactionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public TransactionRefundResponse refund(String transactionId, TransactionRefundParams params)
-      throws Exception {
-    Response response = refundRaw(transactionId, params);
-    return TransactionRefundResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * transactionsForCustomer a transaction using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response transactionsForCustomerRaw(
-      String customerId, TransactionTransactionsForCustomerParams params) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/transactions", "customer-id", customerId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * transactionsForCustomer a transaction without params (executes immediately) - returns raw
-   * Response.
-   */
-  Response transactionsForCustomerRaw(String customerId) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/transactions", "customer-id", customerId);
-    return get(path, null);
-  }
-
-  /**
-   * transactionsForCustomer a transaction using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response transactionsForCustomerRaw(String customerId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams("/customers/{customer-id}/transactions", "customer-id", customerId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public TransactionTransactionsForCustomerResponse transactionsForCustomer(
-      String customerId, TransactionTransactionsForCustomerParams params) throws Exception {
-    Response response = transactionsForCustomerRaw(customerId, params);
-    return TransactionTransactionsForCustomerResponse.fromJson(
-        response.getBodyAsString(), this, params, customerId, response);
-  }
-
-  public TransactionTransactionsForCustomerResponse transactionsForCustomer(String customerId)
-      throws Exception {
-    Response response = transactionsForCustomerRaw(customerId);
-    return TransactionTransactionsForCustomerResponse.fromJson(
-        response.getBodyAsString(), this, null, customerId, response);
-  }
-
-  /** recordRefund a transaction (executes immediately) - returns raw Response. */
-  Response recordRefundRaw(String transactionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/transactions/{transaction-id}/record_refund", "transaction-id", transactionId);
-
-    return post(path, null);
-  }
-
-  /**
-   * recordRefund a transaction using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response recordRefundRaw(String transactionId, TransactionRecordRefundParams params)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/transactions/{transaction-id}/record_refund", "transaction-id", transactionId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * recordRefund a transaction using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response recordRefundRaw(String transactionId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/transactions/{transaction-id}/record_refund", "transaction-id", transactionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public TransactionRecordRefundResponse recordRefund(
-      String transactionId, TransactionRecordRefundParams params) throws Exception {
-    Response response = recordRefundRaw(transactionId, params);
-    return TransactionRecordRefundResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * transactionsForSubscription a transaction using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response transactionsForSubscriptionRaw(
-      String subscriptionId, TransactionTransactionsForSubscriptionParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/transactions", "subscription-id", subscriptionId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * transactionsForSubscription a transaction without params (executes immediately) - returns raw
-   * Response.
-   */
-  Response transactionsForSubscriptionRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/transactions", "subscription-id", subscriptionId);
-    return get(path, null);
-  }
-
-  /**
-   * transactionsForSubscription a transaction using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response transactionsForSubscriptionRaw(String subscriptionId, String jsonPayload)
-      throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/transactions", "subscription-id", subscriptionId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public TransactionTransactionsForSubscriptionResponse transactionsForSubscription(
-      String subscriptionId, TransactionTransactionsForSubscriptionParams params) throws Exception {
-    Response response = transactionsForSubscriptionRaw(subscriptionId, params);
-    return TransactionTransactionsForSubscriptionResponse.fromJson(
-        response.getBodyAsString(), this, params, subscriptionId, response);
-  }
-
-  public TransactionTransactionsForSubscriptionResponse transactionsForSubscription(
-      String subscriptionId) throws Exception {
-    Response response = transactionsForSubscriptionRaw(subscriptionId);
-    return TransactionTransactionsForSubscriptionResponse.fromJson(
-        response.getBodyAsString(), this, null, subscriptionId, response);
-  }
-
-  /** voidTransaction a transaction (executes immediately) - returns raw Response. */
-  Response voidTransactionRaw(String transactionId) throws Exception {
-    String path =
-        buildPathWithParams("/transactions/{transaction-id}/void", "transaction-id", transactionId);
-
-    return post(path, null);
-  }
-
-  public TransactionVoidTransactionResponse voidTransaction(String transactionId) throws Exception {
-    Response response = voidTransactionRaw(transactionId);
-    return TransactionVoidTransactionResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** syncTransaction a transaction (executes immediately) - returns raw Response. */
-  Response syncTransactionRaw(String transactionId) throws Exception {
-    String path =
-        buildPathWithParams("/transactions/{transaction-id}/sync", "transaction-id", transactionId);
-
-    return post(path, null);
-  }
-
-  public TransactionSyncTransactionResponse syncTransaction(String transactionId) throws Exception {
-    Response response = syncTransactionRaw(transactionId);
-    return TransactionSyncTransactionResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createAuthorization a transaction using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createAuthorizationRaw(TransactionCreateAuthorizationParams params) throws Exception {
-
-    return post("/transactions/create_authorization", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createAuthorization a transaction using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createAuthorizationRaw(String jsonPayload) throws Exception {
-
-    return postJson("/transactions/create_authorization", jsonPayload);
-  }
-
-  public TransactionCreateAuthorizationResponse createAuthorization(
-      TransactionCreateAuthorizationParams params) throws Exception {
-    Response response = createAuthorizationRaw(params);
-
-    return TransactionCreateAuthorizationResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * paymentsForInvoice a transaction using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response paymentsForInvoiceRaw(String invoiceId, TransactionPaymentsForInvoiceParams params)
-      throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/payments", "invoice-id", invoiceId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /**
-   * paymentsForInvoice a transaction without params (executes immediately) - returns raw Response.
-   */
-  Response paymentsForInvoiceRaw(String invoiceId) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/payments", "invoice-id", invoiceId);
-    return get(path, null);
-  }
-
-  /**
-   * paymentsForInvoice a transaction using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response paymentsForInvoiceRaw(String invoiceId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/invoices/{invoice-id}/payments", "invoice-id", invoiceId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public TransactionPaymentsForInvoiceResponse paymentsForInvoice(
-      String invoiceId, TransactionPaymentsForInvoiceParams params) throws Exception {
-    Response response = paymentsForInvoiceRaw(invoiceId, params);
-    return TransactionPaymentsForInvoiceResponse.fromJson(
-        response.getBodyAsString(), this, params, invoiceId, response);
-  }
-
-  public TransactionPaymentsForInvoiceResponse paymentsForInvoice(String invoiceId)
-      throws Exception {
-    Response response = paymentsForInvoiceRaw(invoiceId);
-    return TransactionPaymentsForInvoiceResponse.fromJson(
-        response.getBodyAsString(), this, null, invoiceId, response);
-  }
-
-  /** deleteOfflineTransaction a transaction (executes immediately) - returns raw Response. */
-  Response deleteOfflineTransactionRaw(String transactionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/transactions/{transaction-id}/delete_offline_transaction",
-            "transaction-id",
-            transactionId);
-
-    return post(path, null);
-  }
-
-  /**
-   * deleteOfflineTransaction a transaction using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response deleteOfflineTransactionRaw(
-      String transactionId, TransactionDeleteOfflineTransactionParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/transactions/{transaction-id}/delete_offline_transaction",
-            "transaction-id",
-            transactionId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * deleteOfflineTransaction a transaction using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response deleteOfflineTransactionRaw(String transactionId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/transactions/{transaction-id}/delete_offline_transaction",
-            "transaction-id",
-            transactionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public TransactionDeleteOfflineTransactionResponse deleteOfflineTransaction(
-      String transactionId, TransactionDeleteOfflineTransactionParams params) throws Exception {
-    Response response = deleteOfflineTransactionRaw(transactionId, params);
-    return TransactionDeleteOfflineTransactionResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/UnbilledChargeService.java b/src/main/java/com/chargebee/v4/core/services/UnbilledChargeService.java
deleted file mode 100644
index 82ca8bfc..00000000
--- a/src/main/java/com/chargebee/v4/core/services/UnbilledChargeService.java
+++ /dev/null
@@ -1,218 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.unbilledCharge.params.UnbilledChargeInvoiceNowEstimateParams;
-
-import com.chargebee.v4.core.models.unbilledCharge.params.UnbilledChargeInvoiceUnbilledChargesParams;
-
-import com.chargebee.v4.core.models.unbilledCharge.params.UnbilledChargeListParams;
-
-import com.chargebee.v4.core.models.unbilledCharge.params.UnbilledChargeCreateParams;
-
-import com.chargebee.v4.core.models.unbilledCharge.params.UnbilledChargeCreateUnbilledChargeParams;
-
-import com.chargebee.v4.core.responses.unbilledCharge.UnbilledChargeDeleteResponse;
-
-import com.chargebee.v4.core.responses.unbilledCharge.UnbilledChargeInvoiceNowEstimateResponse;
-
-import com.chargebee.v4.core.responses.unbilledCharge.UnbilledChargeInvoiceUnbilledChargesResponse;
-
-import com.chargebee.v4.core.responses.unbilledCharge.UnbilledChargeListResponse;
-
-import com.chargebee.v4.core.responses.unbilledCharge.UnbilledChargeCreateResponse;
-
-import com.chargebee.v4.core.responses.unbilledCharge.UnbilledChargeCreateUnbilledChargeResponse;
-
-public final class UnbilledChargeService extends BaseService<UnbilledChargeService> {
-
-  private final ServiceConfig config;
-
-  public UnbilledChargeService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private UnbilledChargeService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private UnbilledChargeService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  UnbilledChargeService with(RequestOptions newOptions) {
-    return new UnbilledChargeService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public UnbilledChargeService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** delete a unbilledCharge (executes immediately) - returns raw Response. */
-  Response deleteRaw(String unbilledChargeId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/unbilled_charges/{unbilled-charge-id}/delete",
-            "unbilled-charge-id",
-            unbilledChargeId);
-
-    return post(path, null);
-  }
-
-  public UnbilledChargeDeleteResponse delete(String unbilledChargeId) throws Exception {
-    Response response = deleteRaw(unbilledChargeId);
-    return UnbilledChargeDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * invoiceNowEstimate a unbilledCharge using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response invoiceNowEstimateRaw(UnbilledChargeInvoiceNowEstimateParams params) throws Exception {
-
-    return post(
-        "/unbilled_charges/invoice_now_estimate", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * invoiceNowEstimate a unbilledCharge using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response invoiceNowEstimateRaw(String jsonPayload) throws Exception {
-
-    return postJson("/unbilled_charges/invoice_now_estimate", jsonPayload);
-  }
-
-  public UnbilledChargeInvoiceNowEstimateResponse invoiceNowEstimate(
-      UnbilledChargeInvoiceNowEstimateParams params) throws Exception {
-    Response response = invoiceNowEstimateRaw(params);
-
-    return UnbilledChargeInvoiceNowEstimateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * invoiceUnbilledCharges a unbilledCharge using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response invoiceUnbilledChargesRaw(UnbilledChargeInvoiceUnbilledChargesParams params)
-      throws Exception {
-
-    return post(
-        "/unbilled_charges/invoice_unbilled_charges", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * invoiceUnbilledCharges a unbilledCharge using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response invoiceUnbilledChargesRaw(String jsonPayload) throws Exception {
-
-    return postJson("/unbilled_charges/invoice_unbilled_charges", jsonPayload);
-  }
-
-  public UnbilledChargeInvoiceUnbilledChargesResponse invoiceUnbilledCharges(
-      UnbilledChargeInvoiceUnbilledChargesParams params) throws Exception {
-    Response response = invoiceUnbilledChargesRaw(params);
-
-    return UnbilledChargeInvoiceUnbilledChargesResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-
-  /** list a unbilledCharge using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(UnbilledChargeListParams params) throws Exception {
-
-    return get("/unbilled_charges", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a unbilledCharge without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/unbilled_charges", null);
-  }
-
-  /** list a unbilledCharge using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public UnbilledChargeListResponse list(UnbilledChargeListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return UnbilledChargeListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public UnbilledChargeListResponse list() throws Exception {
-    Response response = listRaw();
-    return UnbilledChargeListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-
-  /**
-   * create a unbilledCharge using immutable params (executes immediately) - returns raw Response.
-   */
-  Response createRaw(UnbilledChargeCreateParams params) throws Exception {
-
-    return post("/unbilled_charges", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * create a unbilledCharge using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/unbilled_charges", jsonPayload);
-  }
-
-  public UnbilledChargeCreateResponse create(UnbilledChargeCreateParams params) throws Exception {
-    Response response = createRaw(params);
-
-    return UnbilledChargeCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createUnbilledCharge a unbilledCharge using immutable params (executes immediately) - returns
-   * raw Response.
-   */
-  Response createUnbilledChargeRaw(UnbilledChargeCreateUnbilledChargeParams params)
-      throws Exception {
-
-    return post("/unbilled_charges/create", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createUnbilledCharge a unbilledCharge using raw JSON payload (executes immediately) - returns
-   * raw Response.
-   */
-  Response createUnbilledChargeRaw(String jsonPayload) throws Exception {
-
-    return postJson("/unbilled_charges/create", jsonPayload);
-  }
-
-  public UnbilledChargeCreateUnbilledChargeResponse createUnbilledCharge(
-      UnbilledChargeCreateUnbilledChargeParams params) throws Exception {
-    Response response = createUnbilledChargeRaw(params);
-
-    return UnbilledChargeCreateUnbilledChargeResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/UsageService.java b/src/main/java/com/chargebee/v4/core/services/UsageService.java
deleted file mode 100644
index fbdbbcf7..00000000
--- a/src/main/java/com/chargebee/v4/core/services/UsageService.java
+++ /dev/null
@@ -1,188 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.usage.params.UsagePdfParams;
-
-import com.chargebee.v4.core.models.usage.params.UsageCreateParams;
-
-import com.chargebee.v4.core.models.usage.params.UsageDeleteParams;
-
-import com.chargebee.v4.core.models.usage.params.UsageListParams;
-
-import com.chargebee.v4.core.responses.usage.UsagePdfResponse;
-
-import com.chargebee.v4.core.responses.usage.UsageRetrieveResponse;
-
-import com.chargebee.v4.core.responses.usage.UsageCreateResponse;
-
-import com.chargebee.v4.core.responses.usage.UsageDeleteResponse;
-
-import com.chargebee.v4.core.responses.usage.UsageListResponse;
-
-public final class UsageService extends BaseService<UsageService> {
-
-  private final ServiceConfig config;
-
-  public UsageService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private UsageService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private UsageService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  UsageService with(RequestOptions newOptions) {
-    return new UsageService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public UsageService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** pdf a usage using immutable params (executes immediately) - returns raw Response. */
-  Response pdfRaw(UsagePdfParams params) throws Exception {
-
-    return post("/usages/pdf", params != null ? params.toFormData() : null);
-  }
-
-  /** pdf a usage using raw JSON payload (executes immediately) - returns raw Response. */
-  Response pdfRaw(String jsonPayload) throws Exception {
-
-    return postJson("/usages/pdf", jsonPayload);
-  }
-
-  public UsagePdfResponse pdf(UsagePdfParams params) throws Exception {
-    Response response = pdfRaw(params);
-
-    return UsagePdfResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a usage (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/usages", "subscription-id", subscriptionId);
-
-    return get(path, null);
-  }
-
-  public UsageRetrieveResponse retrieve(String subscriptionId) throws Exception {
-    Response response = retrieveRaw(subscriptionId);
-    return UsageRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** create a usage (executes immediately) - returns raw Response. */
-  Response createRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/usages", "subscription-id", subscriptionId);
-
-    return post(path, null);
-  }
-
-  /** create a usage using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(String subscriptionId, UsageCreateParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/usages", "subscription-id", subscriptionId);
-    return post(path, params.toFormData());
-  }
-
-  /** create a usage using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String subscriptionId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/usages", "subscription-id", subscriptionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public UsageCreateResponse create(String subscriptionId, UsageCreateParams params)
-      throws Exception {
-    Response response = createRaw(subscriptionId, params);
-    return UsageCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** delete a usage (executes immediately) - returns raw Response. */
-  Response deleteRaw(String subscriptionId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/delete_usage", "subscription-id", subscriptionId);
-
-    return post(path, null);
-  }
-
-  /** delete a usage using immutable params (executes immediately) - returns raw Response. */
-  Response deleteRaw(String subscriptionId, UsageDeleteParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/delete_usage", "subscription-id", subscriptionId);
-    return post(path, params.toFormData());
-  }
-
-  /** delete a usage using raw JSON payload (executes immediately) - returns raw Response. */
-  Response deleteRaw(String subscriptionId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/subscriptions/{subscription-id}/delete_usage", "subscription-id", subscriptionId);
-    return postJson(path, jsonPayload);
-  }
-
-  public UsageDeleteResponse delete(String subscriptionId, UsageDeleteParams params)
-      throws Exception {
-    Response response = deleteRaw(subscriptionId, params);
-    return UsageDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** list a usage using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(UsageListParams params) throws Exception {
-
-    return get("/usages", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a usage without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/usages", null);
-  }
-
-  /** list a usage using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public UsageListResponse list(UsageListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return UsageListResponse.fromJson(response.getBodyAsString(), this, params, response);
-  }
-
-  public UsageListResponse list() throws Exception {
-    Response response = listRaw();
-    return UsageListResponse.fromJson(response.getBodyAsString(), this, null, response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/VariantService.java b/src/main/java/com/chargebee/v4/core/services/VariantService.java
deleted file mode 100644
index 6dc485e5..00000000
--- a/src/main/java/com/chargebee/v4/core/services/VariantService.java
+++ /dev/null
@@ -1,192 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.variant.params.VariantListProductVariantsParams;
-
-import com.chargebee.v4.core.models.variant.params.VariantCreateProductVariantParams;
-
-import com.chargebee.v4.core.models.variant.params.VariantUpdateParams;
-
-import com.chargebee.v4.core.responses.variant.VariantListProductVariantsResponse;
-
-import com.chargebee.v4.core.responses.variant.VariantCreateProductVariantResponse;
-
-import com.chargebee.v4.core.responses.variant.VariantRetrieveResponse;
-
-import com.chargebee.v4.core.responses.variant.VariantUpdateResponse;
-
-import com.chargebee.v4.core.responses.variant.VariantDeleteResponse;
-
-public final class VariantService extends BaseService<VariantService> {
-
-  private final ServiceConfig config;
-
-  public VariantService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private VariantService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private VariantService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  VariantService with(RequestOptions newOptions) {
-    return new VariantService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public VariantService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /**
-   * listProductVariants a variant using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response listProductVariantsRaw(String productId, VariantListProductVariantsParams params)
-      throws Exception {
-    String path = buildPathWithParams("/products/{product-id}/variants", "product-id", productId);
-    return get(path, params != null ? params.toQueryParams() : null);
-  }
-
-  /** listProductVariants a variant without params (executes immediately) - returns raw Response. */
-  Response listProductVariantsRaw(String productId) throws Exception {
-    String path = buildPathWithParams("/products/{product-id}/variants", "product-id", productId);
-    return get(path, null);
-  }
-
-  /**
-   * listProductVariants a variant using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response listProductVariantsRaw(String productId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/products/{product-id}/variants", "product-id", productId);
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public VariantListProductVariantsResponse listProductVariants(
-      String productId, VariantListProductVariantsParams params) throws Exception {
-    Response response = listProductVariantsRaw(productId, params);
-    return VariantListProductVariantsResponse.fromJson(
-        response.getBodyAsString(), this, params, productId, response);
-  }
-
-  public VariantListProductVariantsResponse listProductVariants(String productId) throws Exception {
-    Response response = listProductVariantsRaw(productId);
-    return VariantListProductVariantsResponse.fromJson(
-        response.getBodyAsString(), this, null, productId, response);
-  }
-
-  /** createProductVariant a variant (executes immediately) - returns raw Response. */
-  Response createProductVariantRaw(String productId) throws Exception {
-    String path = buildPathWithParams("/products/{product-id}/variants", "product-id", productId);
-
-    return post(path, null);
-  }
-
-  /**
-   * createProductVariant a variant using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createProductVariantRaw(String productId, VariantCreateProductVariantParams params)
-      throws Exception {
-    String path = buildPathWithParams("/products/{product-id}/variants", "product-id", productId);
-    return post(path, params.toFormData());
-  }
-
-  /**
-   * createProductVariant a variant using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createProductVariantRaw(String productId, String jsonPayload) throws Exception {
-    String path = buildPathWithParams("/products/{product-id}/variants", "product-id", productId);
-    return postJson(path, jsonPayload);
-  }
-
-  public VariantCreateProductVariantResponse createProductVariant(
-      String productId, VariantCreateProductVariantParams params) throws Exception {
-    Response response = createProductVariantRaw(productId, params);
-    return VariantCreateProductVariantResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a variant (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String productVariantId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/variants/{product-variant-id}", "product-variant-id", productVariantId);
-
-    return get(path, null);
-  }
-
-  public VariantRetrieveResponse retrieve(String productVariantId) throws Exception {
-    Response response = retrieveRaw(productVariantId);
-    return VariantRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** update a variant (executes immediately) - returns raw Response. */
-  Response updateRaw(String productVariantId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/variants/{product-variant-id}", "product-variant-id", productVariantId);
-
-    return post(path, null);
-  }
-
-  /** update a variant using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String productVariantId, VariantUpdateParams params) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/variants/{product-variant-id}", "product-variant-id", productVariantId);
-    return post(path, params.toFormData());
-  }
-
-  /** update a variant using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String productVariantId, String jsonPayload) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/variants/{product-variant-id}", "product-variant-id", productVariantId);
-    return postJson(path, jsonPayload);
-  }
-
-  public VariantUpdateResponse update(String productVariantId, VariantUpdateParams params)
-      throws Exception {
-    Response response = updateRaw(productVariantId, params);
-    return VariantUpdateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** delete a variant (executes immediately) - returns raw Response. */
-  Response deleteRaw(String productVariantId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/variants/{product-variant-id}/delete", "product-variant-id", productVariantId);
-
-    return post(path, null);
-  }
-
-  public VariantDeleteResponse delete(String productVariantId) throws Exception {
-    Response response = deleteRaw(productVariantId);
-    return VariantDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/core/services/VirtualBankAccountService.java b/src/main/java/com/chargebee/v4/core/services/VirtualBankAccountService.java
deleted file mode 100644
index 3670039c..00000000
--- a/src/main/java/com/chargebee/v4/core/services/VirtualBankAccountService.java
+++ /dev/null
@@ -1,222 +0,0 @@
-/*
- * This file is auto-generated by Chargebee.
- * For more information on how to make changes to this file, please see the README.
- * Reach out to dx@chargebee.com for any questions.
- * Copyright 2025 Chargebee Inc.
- */
-
-package com.chargebee.v4.core.services;
-
-import com.chargebee.v4.client.ChargebeeClient;
-import com.chargebee.v4.client.request.RequestOptions;
-import com.chargebee.v4.transport.Response;
-
-import com.chargebee.v4.core.models.virtualBankAccount.params.VirtualBankAccountListParams;
-
-import com.chargebee.v4.core.models.virtualBankAccount.params.VirtualBankAccountCreateParams;
-
-import com.chargebee.v4.core.models.virtualBankAccount.params.VirtualBankAccountCreateUsingPermanentTokenParams;
-
-import com.chargebee.v4.core.responses.virtualBankAccount.VirtualBankAccountDeleteLocalResponse;
-
-import com.chargebee.v4.core.responses.virtualBankAccount.VirtualBankAccountDeleteResponse;
-
-import com.chargebee.v4.core.responses.virtualBankAccount.VirtualBankAccountListResponse;
-
-import com.chargebee.v4.core.responses.virtualBankAccount.VirtualBankAccountCreateResponse;
-
-import com.chargebee.v4.core.responses.virtualBankAccount.VirtualBankAccountSyncFundResponse;
-
-import com.chargebee.v4.core.responses.virtualBankAccount.VirtualBankAccountRetrieveResponse;
-
-import com.chargebee.v4.core.responses.virtualBankAccount.VirtualBankAccountCreateUsingPermanentTokenResponse;
-
-public final class VirtualBankAccountService extends BaseService<VirtualBankAccountService> {
-
-  private final ServiceConfig config;
-
-  public VirtualBankAccountService(ChargebeeClient client) {
-    super(client);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private VirtualBankAccountService(ChargebeeClient client, RequestOptions options) {
-    super(client, options);
-    this.config = ServiceConfig.defaultConfig();
-  }
-
-  private VirtualBankAccountService(
-      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
-    super(client, options);
-    this.config = config;
-  }
-
-  @Override
-  VirtualBankAccountService with(RequestOptions newOptions) {
-    return new VirtualBankAccountService(client, newOptions, config);
-  }
-
-  /**
-   * Apply per-request options for this service instance. Users can chain .withOptions or .options
-   * to set headers and other options.
-   */
-  public VirtualBankAccountService withOptions(RequestOptions options) {
-    return with(options);
-  }
-
-  // === Operations ===
-
-  /** deleteLocal a virtualBankAccount (executes immediately) - returns raw Response. */
-  Response deleteLocalRaw(String virtualBankAccountId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/virtual_bank_accounts/{virtual-bank-account-id}/delete_local",
-            "virtual-bank-account-id",
-            virtualBankAccountId);
-
-    return post(path, null);
-  }
-
-  public VirtualBankAccountDeleteLocalResponse deleteLocal(String virtualBankAccountId)
-      throws Exception {
-    Response response = deleteLocalRaw(virtualBankAccountId);
-    return VirtualBankAccountDeleteLocalResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** delete a virtualBankAccount (executes immediately) - returns raw Response. */
-  Response deleteRaw(String virtualBankAccountId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/virtual_bank_accounts/{virtual-bank-account-id}/delete",
-            "virtual-bank-account-id",
-            virtualBankAccountId);
-
-    return post(path, null);
-  }
-
-  public VirtualBankAccountDeleteResponse delete(String virtualBankAccountId) throws Exception {
-    Response response = deleteRaw(virtualBankAccountId);
-    return VirtualBankAccountDeleteResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * list a virtualBankAccount using immutable params (executes immediately) - returns raw Response.
-   */
-  Response listRaw(VirtualBankAccountListParams params) throws Exception {
-
-    return get("/virtual_bank_accounts", params != null ? params.toQueryParams() : null);
-  }
-
-  /** list a virtualBankAccount without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
-
-    return get("/virtual_bank_accounts", null);
-  }
-
-  /**
-   * list a virtualBankAccount using raw JSON payload (executes immediately) - returns raw Response.
-   */
-  Response listRaw(String jsonPayload) throws Exception {
-
-    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
-  }
-
-  public VirtualBankAccountListResponse list(VirtualBankAccountListParams params) throws Exception {
-    Response response = listRaw(params);
-
-    return VirtualBankAccountListResponse.fromJson(
-        response.getBodyAsString(), this, params, response);
-  }
-
-  public VirtualBankAccountListResponse list() throws Exception {
-    Response response = listRaw();
-    return VirtualBankAccountListResponse.fromJson(
-        response.getBodyAsString(), this, null, response);
-  }
-
-  /**
-   * create a virtualBankAccount using immutable params (executes immediately) - returns raw
-   * Response.
-   */
-  Response createRaw(VirtualBankAccountCreateParams params) throws Exception {
-
-    return post("/virtual_bank_accounts", params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * create a virtualBankAccount using raw JSON payload (executes immediately) - returns raw
-   * Response.
-   */
-  Response createRaw(String jsonPayload) throws Exception {
-
-    return postJson("/virtual_bank_accounts", jsonPayload);
-  }
-
-  public VirtualBankAccountCreateResponse create(VirtualBankAccountCreateParams params)
-      throws Exception {
-    Response response = createRaw(params);
-
-    return VirtualBankAccountCreateResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** syncFund a virtualBankAccount (executes immediately) - returns raw Response. */
-  Response syncFundRaw(String virtualBankAccountId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/virtual_bank_accounts/{virtual-bank-account-id}/sync_fund",
-            "virtual-bank-account-id",
-            virtualBankAccountId);
-
-    return post(path, null);
-  }
-
-  public VirtualBankAccountSyncFundResponse syncFund(String virtualBankAccountId) throws Exception {
-    Response response = syncFundRaw(virtualBankAccountId);
-    return VirtualBankAccountSyncFundResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /** retrieve a virtualBankAccount (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String virtualBankAccountId) throws Exception {
-    String path =
-        buildPathWithParams(
-            "/virtual_bank_accounts/{virtual-bank-account-id}",
-            "virtual-bank-account-id",
-            virtualBankAccountId);
-
-    return get(path, null);
-  }
-
-  public VirtualBankAccountRetrieveResponse retrieve(String virtualBankAccountId) throws Exception {
-    Response response = retrieveRaw(virtualBankAccountId);
-    return VirtualBankAccountRetrieveResponse.fromJson(response.getBodyAsString(), response);
-  }
-
-  /**
-   * createUsingPermanentToken a virtualBankAccount using immutable params (executes immediately) -
-   * returns raw Response.
-   */
-  Response createUsingPermanentTokenRaw(VirtualBankAccountCreateUsingPermanentTokenParams params)
-      throws Exception {
-
-    return post(
-        "/virtual_bank_accounts/create_using_permanent_token",
-        params != null ? params.toFormData() : null);
-  }
-
-  /**
-   * createUsingPermanentToken a virtualBankAccount using raw JSON payload (executes immediately) -
-   * returns raw Response.
-   */
-  Response createUsingPermanentTokenRaw(String jsonPayload) throws Exception {
-
-    return postJson("/virtual_bank_accounts/create_using_permanent_token", jsonPayload);
-  }
-
-  public VirtualBankAccountCreateUsingPermanentTokenResponse createUsingPermanentToken(
-      VirtualBankAccountCreateUsingPermanentTokenParams params) throws Exception {
-    Response response = createUsingPermanentTokenRaw(params);
-
-    return VirtualBankAccountCreateUsingPermanentTokenResponse.fromJson(
-        response.getBodyAsString(), response);
-  }
-}
diff --git a/src/main/java/com/chargebee/v4/exceptions/APIException.java b/src/main/java/com/chargebee/v4/exceptions/APIException.java
index 43ee07da..7793ef97 100644
--- a/src/main/java/com/chargebee/v4/exceptions/APIException.java
+++ b/src/main/java/com/chargebee/v4/exceptions/APIException.java
@@ -1,96 +1,293 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
 package com.chargebee.v4.exceptions;
 
+import com.chargebee.v4.exceptions.codes.ApiErrorCode;
 import com.chargebee.v4.internal.JsonUtil;
-import com.chargebee.v4.transport.HttpException;
+import com.chargebee.v4.transport.Request;
 import com.chargebee.v4.transport.Response;
 
 import java.util.ArrayList;
 import java.util.List;
 
 /**
- * Base exception for Chargebee API errors.
- * Contains parsed error information from the API response including type, message, and error parameters.
+ * Base exception for all Chargebee API errors.
+ *
+ * <p>Contains parsed error information from the API response with the following attributes:
+ *
+ * <ul>
+ *   <li><b>message</b> - Descriptive information about the error (for developer consumption)
+ *   <li><b>type</b> - Groups errors based on error handling routine (payment, invalid_request,
+ *       operation_failed)
+ *   <li><b>api_error_code</b> - Specific code for handling specific errors
+ *   <li><b>param</b> - The parameter name if error is due to a specific parameter
+ *   <li><b>error_cause_id</b> - Chargebee-defined code for standardizing errors across gateway
+ *       services
+ * </ul>
+ *
+ * <p>Use {@link #getErrorType()} for strongly-typed error type handling.
+ *
+ * <p>Example usage:
+ *
+ * <pre>{@code
+ * try {
+ *     // API call
+ * } catch (InvalidRequestException e) {
+ *     ErrorType type = e.getErrorType();
+ *     ApiErrorCode errorCode = e.getApiErrorCode();
+ *     List<String> invalidParams = e.getParams();
+ *     String causeId = e.getErrorCauseId();
+ *
+ *     // Type-safe error handling with enum
+ *     if (errorCode instanceof BadRequestApiErrorCode) {
+ *         BadRequestApiErrorCode code = (BadRequestApiErrorCode) errorCode;
+ *         if (code == BadRequestApiErrorCode.DUPLICATE_ENTRY) {
+ *             // Handle duplicate entry
+ *         }
+ *     }
+ * } catch (PaymentException e) {
+ *     // Check error_cause_id for gateway-specific error handling
+ *     if (e.getErrorCauseId() != null) {
+ *         System.out.println("Gateway error cause: " + e.getErrorCauseId());
+ *     }
+ * }
+ * }</pre>
  */
 public class APIException extends HttpException {
-    private final String type;
-    private final String apiErrorCode;
-    private final String jsonResponse;
-    private final List<String> params;
-
-    public APIException(int statusCode, String type, String apiErrorCode, String message,
-                       String jsonResponse, Response response) {
-        super(statusCode, message, response);
-        this.type = type;
-        this.apiErrorCode = apiErrorCode;
-        this.jsonResponse = jsonResponse;
-        this.params = extractParams(jsonResponse);
-    }
 
-    /**
-     * Get the error type from API response (e.g., "payment", "invalid_request", "operation_failed").
-     */
-    public String getType() {
-        return type;
-    }
+  /**
+   * The error type as a strongly-typed enum. Groups errors based on the error handling routine
+   * required.
+   */
+  private final ErrorType errorType;
 
-    /**
-     * Get the API-specific error code (e.g., "card_declined", "invalid_parameter").
-     */
-    public String getApiErrorCode() {
-        return apiErrorCode;
-    }
+  /**
+   * The raw error type string as returned by the API. Values: "payment", "invalid_request",
+   * "operation_failed", or null.
+   */
+  private final String type;
 
-    /**
-     * Get the full JSON response as string.
-     */
-    public String getJsonResponse() {
-        return jsonResponse;
-    }
+  /**
+   * A more specific error code as a strongly-typed enum. Implements ApiErrorCode interface for
+   * type-safe error handling.
+   */
+  private final ApiErrorCode apiErrorCode;
 
-    /**
-     * Get the parameter names that were invalid (for validation errors).
-     */
-    public List<String> getParams() {
-        return params;
-    }
+  /**
+   * The raw API error code string as returned by the API. Example: "duplicate_entry",
+   * "payment_processing_failed", "resource_not_found"
+   */
+  private final String apiErrorCodeRaw;
+
+  /**
+   * The parameter name(s) if the error is due to specific parameter(s). Empty list if error is not
+   * parameter-specific.
+   */
+  private final List<String> params;
+
+  /**
+   * Chargebee-defined code for standardizing errors across different gateway services. Helps in
+   * consistent error handling across payment gateways. May be null if not applicable.
+   */
+  private final String errorCauseId;
+
+  /** The full JSON response for debugging or extracting additional details. */
+  private final String jsonResponse;
+
+  public APIException(
+      int statusCode,
+      String type,
+      ApiErrorCode apiErrorCode,
+      String message,
+      String jsonResponse,
+      Request request,
+      Response response) {
+    super(statusCode, message, request, response);
+    this.type = type;
+    this.errorType = ErrorType.fromString(type);
+    this.apiErrorCode = apiErrorCode;
+    this.apiErrorCodeRaw = apiErrorCode != null ? apiErrorCode.getValue() : null;
+    this.jsonResponse = jsonResponse;
+    this.params = extractParams(jsonResponse);
+    this.errorCauseId = extractErrorCauseId(jsonResponse);
+  }
+
+  /**
+   * Get the error type as a strongly-typed enum. Use this for programmatic error handling with type
+   * safety.
+   *
+   * <p>The type groups errors based on the error handling routine required:
+   *
+   * <ul>
+   *   <li>{@link ErrorType#PAYMENT} - Payment-related errors
+   *   <li>{@link ErrorType#INVALID_REQUEST} - Validation and request errors
+   *   <li>{@link ErrorType#OPERATION_FAILED} - Business logic errors
+   * </ul>
+   *
+   * @return the error type enum, or {@link ErrorType#_UNKNOWN} for unrecognized types
+   */
+  public ErrorType getErrorType() {
+    return errorType;
+  }
+
+  /**
+   * Get the raw error type string as returned by the API. Use this when you need the exact API
+   * value or for logging.
+   *
+   * <p>Possible values: "payment", "invalid_request", "operation_failed", or null
+   *
+   * @return the raw error type string, may be null
+   */
+  public String getType() {
+    return type;
+  }
+
+  /**
+   * Get the API error code as a strongly-typed enum.
+   *
+   * <p>The returned enum implements {@link ApiErrorCode} and can be cast to the specific enum type
+   * based on the HTTP status code:
+   *
+   * <pre>{@code
+   * ApiErrorCode code = e.getApiErrorCode();
+   * if (code instanceof BadRequestApiErrorCode) {
+   *     BadRequestApiErrorCode badRequestCode = (BadRequestApiErrorCode) code;
+   *     if (badRequestCode == BadRequestApiErrorCode.DUPLICATE_ENTRY) {
+   *         // Handle duplicate
+   *     }
+   * }
+   * }</pre>
+   *
+   * @return the API error code as a typed enum
+   */
+  public ApiErrorCode getApiErrorCode() {
+    return apiErrorCode;
+  }
 
-    /**
-     * Extract parameter names from error response.
-     */
-    private List<String> extractParams(String jsonResponse) {
-        List<String> paramsList = new ArrayList<>();
-        if (jsonResponse != null) {
-            // Try to extract single param string
-            String param = JsonUtil.getString(jsonResponse, "param");
-            if (param != null) {
-                paramsList.add(param);
-            } else {
-                // Try to extract param array
-                String paramArray = JsonUtil.getArray(jsonResponse, "param");
-                if (paramArray != null) {
-                    paramsList.addAll(JsonUtil.parseArrayOfString(paramArray));
-                }
-            }
+  /**
+   * Get the raw API error code string as returned by the API. Use this when you need the exact API
+   * value or for logging.
+   *
+   * @return the raw API error code string
+   */
+  public String getApiErrorCodeRaw() {
+    return apiErrorCodeRaw;
+  }
+
+  /**
+   * Get the parameter name(s) that caused the error.
+   *
+   * <p>This is provided when the error is due to a specific parameter. The parameter name matches
+   * the API documentation (cURL format).
+   *
+   * <p>Note: For URL path parameters like customer_id, if invalid, a resource_not_found error is
+   * thrown without the param attribute.
+   *
+   * @return list of parameter names that caused the error, empty if not parameter-specific
+   */
+  public List<String> getParams() {
+    return params;
+  }
+
+  /**
+   * Get the first parameter name that caused the error. Convenience method when only one parameter
+   * is expected.
+   *
+   * @return the first parameter name, or null if no parameters
+   */
+  public String getParam() {
+    return params.isEmpty() ? null : params.get(0);
+  }
+
+  /**
+   * Get the error cause ID - a Chargebee-defined code for standardizing errors across different
+   * gateway services.
+   *
+   * <p>This helps in identifying and handling errors consistently across different payment
+   * gateways.
+   *
+   * @return the error cause ID, may be null if not applicable
+   */
+  public String getErrorCauseId() {
+    return errorCauseId;
+  }
+
+  /**
+   * Get the full JSON response as string. Useful for debugging or extracting additional error
+   * details not covered by the typed fields.
+   *
+   * @return the full JSON error response
+   */
+  public String getJsonResponse() {
+    return jsonResponse;
+  }
+
+  /** Extract parameter names from error response. */
+  private List<String> extractParams(String jsonResponse) {
+    List<String> paramsList = new ArrayList<>();
+    if (jsonResponse != null) {
+      String param = JsonUtil.getString(jsonResponse, "param");
+      if (param != null) {
+        paramsList.add(param);
+      } else {
+        String paramArray = JsonUtil.getArray(jsonResponse, "param");
+        if (paramArray != null) {
+          paramsList.addAll(JsonUtil.parseArrayOfString(paramArray));
         }
-        return paramsList;
+      }
     }
+    return paramsList;
+  }
 
-    @Override
-    public String toString() {
-        StringBuilder sb = new StringBuilder();
-        sb.append(getClass().getSimpleName());
-        sb.append("{statusCode=").append(getStatusCode());
-        if (type != null) {
-            sb.append(", type='").append(type).append("'");
-        }
-        if (apiErrorCode != null) {
-            sb.append(", apiErrorCode='").append(apiErrorCode).append("'");
-        }
-        sb.append(", message='").append(getMessage()).append("'");
-        if (params != null && !params.isEmpty()) {
-            sb.append(", params=").append(params);
-        }
-        sb.append("}");
-        return sb.toString();
+  /** Extract error_cause_id from error response. */
+  private String extractErrorCauseId(String jsonResponse) {
+    if (jsonResponse != null) {
+      return JsonUtil.getString(jsonResponse, "error_cause_id");
+    }
+    return null;
+  }
+
+  /**
+   * API errors are generally not retryable as they indicate business logic issues.
+   *
+   * <p>Exceptions that may warrant retry:
+   *
+   * <ul>
+   *   <li>429 Too Many Requests - Rate limiting
+   *   <li>5xx Server errors - Temporary server issues
+   * </ul>
+   *
+   * @return true only for 429 or 5xx status codes
+   */
+  @Override
+  public boolean isRetryable() {
+    int code = getStatusCode();
+    // 429 Too Many Requests or 5xx server errors (except 501)
+    return code == 429 || (code >= 500 && code != 501);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append(getClass().getSimpleName());
+    sb.append("{statusCode=").append(getStatusCode());
+    if (type != null) {
+      sb.append(", type='").append(type).append("'");
+    }
+    if (apiErrorCodeRaw != null) {
+      sb.append(", apiErrorCode='").append(apiErrorCodeRaw).append("'");
+    }
+    sb.append(", message='").append(getMessage()).append("'");
+    if (params != null && !params.isEmpty()) {
+      sb.append(", params=").append(params);
+    }
+    if (errorCauseId != null) {
+      sb.append(", errorCauseId='").append(errorCauseId).append("'");
     }
+    sb.append("}");
+    return sb.toString();
+  }
 }
diff --git a/src/main/java/com/chargebee/v4/exceptions/BatchAPIException.java b/src/main/java/com/chargebee/v4/exceptions/BatchAPIException.java
index 7d4c6deb..5b0b0bbc 100644
--- a/src/main/java/com/chargebee/v4/exceptions/BatchAPIException.java
+++ b/src/main/java/com/chargebee/v4/exceptions/BatchAPIException.java
@@ -1,5 +1,7 @@
 package com.chargebee.v4.exceptions;
 
+import com.chargebee.v4.exceptions.codes.ApiErrorCode;
+import com.chargebee.v4.transport.Request;
 import com.chargebee.v4.transport.Response;
 
 /**
@@ -8,8 +10,8 @@
  */
 public class BatchAPIException extends APIException {
 
-    public BatchAPIException(int statusCode, String type, String apiErrorCode, String message,
-                            String jsonResponse, Response response) {
-        super(statusCode, type, apiErrorCode, message, jsonResponse, response);
+    public BatchAPIException(int statusCode, String type, ApiErrorCode apiErrorCode, String message,
+                            String jsonResponse, Request request, Response response) {
+        super(statusCode, type, apiErrorCode, message, jsonResponse, request, response);
     }
 }
diff --git a/src/main/java/com/chargebee/v4/exceptions/ChargebeeException.java b/src/main/java/com/chargebee/v4/exceptions/ChargebeeException.java
new file mode 100644
index 00000000..00ba4acb
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/ChargebeeException.java
@@ -0,0 +1,95 @@
+package com.chargebee.v4.exceptions;
+
+/**
+ * The root exception class for all errors originating from the Chargebee SDK.
+ * 
+ * <p>{@code ChargebeeException} serves as the unified base for the SDK's exception hierarchy,
+ * enabling developers to catch all Chargebee-related errors with a single exception type
+ * while still allowing fine-grained handling of specific error categories.</p>
+ * 
+ * <h2>Exception Hierarchy</h2>
+ * <pre>
+ * ChargebeeException
+ * ├── {@link ConfigurationException}     — Invalid SDK configuration (missing API key, malformed URL)
+ * └── {@link TransportException}         — Runtime communication errors
+ *     ├── {@link NetworkException}       — Connection failures, DNS resolution errors
+ *     ├── {@link TimeoutException}       — Connect or read timeout exceeded
+ *     └── {@link HttpException}          — HTTP-level errors (4xx, 5xx responses)
+ *         ├── {@link ClientErrorException}   — Client errors (400-499)
+ *         ├── {@link ServerErrorException}   — Server errors (500-599)
+ *         └── {@link APIException}           — Chargebee API errors with structured details
+ * </pre>
+ * 
+ * <h2>Usage Patterns</h2>
+ * 
+ * <h3>Catch-all handling</h3>
+ * <pre>{@code
+ * try {
+ *     client.subscriptions().create(params);
+ * } catch (ChargebeeException e) {
+ *     log.error("Chargebee operation failed: {}", e.getMessage());
+ *     if (e.isRetryable()) {
+ *         // Schedule retry
+ *     }
+ * }
+ * }</pre>
+ * 
+ * <h3>Granular error handling</h3>
+ * <pre>{@code
+ * try {
+ *     client.subscriptions().create(params);
+ * } catch (InvalidRequestException e) {
+ *     // Handle validation errors - check e.getParams() for invalid fields
+ * } catch (PaymentException e) {
+ *     // Handle payment failures - check e.getErrorCauseId() for gateway details
+ * } catch (NetworkException | TimeoutException e) {
+ *     // Handle transient failures - safe to retry
+ * } catch (ChargebeeException e) {
+ *     // Fallback for unexpected SDK errors
+ * }
+ * }</pre>
+ * 
+ * @see TransportException
+ * @see ConfigurationException
+ * @see APIException
+ */
+public class ChargebeeException extends RuntimeException {
+    
+    /**
+     * Constructs a new exception with the specified detail message.
+     *
+     * @param message the detail message describing the error condition
+     */
+    public ChargebeeException(String message) {
+        super(message);
+    }
+    
+    /**
+     * Constructs a new exception with the specified detail message and cause.
+     *
+     * @param message the detail message describing the error condition
+     * @param cause the underlying exception that triggered this error
+     */
+    public ChargebeeException(String message, Throwable cause) {
+        super(message, cause);
+    }
+    
+    /**
+     * Indicates whether retrying the failed operation might succeed.
+     * 
+     * <p>Subclasses override this method to provide accurate retry guidance:</p>
+     * <ul>
+     *   <li>{@link NetworkException} — returns {@code true} (transient connectivity issues)</li>
+     *   <li>{@link TimeoutException} — returns {@code true} (temporary overload)</li>
+     *   <li>{@link ServerErrorException} — returns {@code true} for 5xx except 501</li>
+     *   <li>{@link ClientErrorException} — returns {@code true} only for 429 (rate limited)</li>
+     *   <li>{@link ConfigurationException} — returns {@code false} (requires code fix)</li>
+     * </ul>
+     *
+     * @return {@code true} if the operation may succeed on retry; {@code false} otherwise
+     */
+    public boolean isRetryable() {
+        return false;
+    }
+}
+
diff --git a/src/main/java/com/chargebee/v4/exceptions/ClientErrorException.java b/src/main/java/com/chargebee/v4/exceptions/ClientErrorException.java
new file mode 100644
index 00000000..1d65707c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/ClientErrorException.java
@@ -0,0 +1,178 @@
+package com.chargebee.v4.exceptions;
+
+import com.chargebee.v4.transport.Request;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Exception for 4xx HTTP status codes (client errors).
+ * 
+ * <p>Client errors indicate issues with the request itself:
+ * <ul>
+ *   <li>400 Bad Request - Invalid request format or parameters</li>
+ *   <li>401 Unauthorized - Missing or invalid authentication</li>
+ *   <li>403 Forbidden - Valid auth but insufficient permissions</li>
+ *   <li>404 Not Found - Resource doesn't exist</li>
+ *   <li>409 Conflict - Resource state conflict</li>
+ *   <li>422 Unprocessable Entity - Validation errors</li>
+ *   <li>429 Too Many Requests - Rate limiting (retryable)</li>
+ * </ul>
+ * 
+ * <p>Convenience methods for checking specific error types:
+ * <pre>{@code
+ * try {
+ *     client.customers().retrieve("invalid_id");
+ * } catch (ClientErrorException e) {
+ *     if (e.isNotFound()) {
+ *         // Customer doesn't exist
+ *     } else if (e.isUnauthorized()) {
+ *         // Check API key
+ *     } else if (e.isTooManyRequests()) {
+ *         // Back off and retry
+ *         Thread.sleep(e.getRetryAfterMs());
+ *     }
+ * }
+ * }</pre>
+ */
+public class ClientErrorException extends HttpException {
+    
+    /** HTTP status code for rate limiting. */
+    public static final int TOO_MANY_REQUESTS = 429;
+    
+    /**
+     * Creates a ClientErrorException.
+     *
+     * @param statusCode the HTTP status code (4xx)
+     * @param message descriptive error message
+     * @param request the original HTTP request
+     * @param response the HTTP response
+     */
+    public ClientErrorException(int statusCode, String message, Request request, Response response) {
+        super(statusCode, message, request, response);
+    }
+    
+    /**
+     * Creates a ClientErrorException with cause.
+     *
+     * @param statusCode the HTTP status code (4xx)
+     * @param message descriptive error message
+     * @param request the original HTTP request
+     * @param response the HTTP response
+     * @param cause the underlying cause
+     */
+    public ClientErrorException(int statusCode, String message, Request request, Response response, Throwable cause) {
+        super(statusCode, message, request, response, cause);
+    }
+    
+    /**
+     * Client errors are generally not retryable, except for 429 Too Many Requests.
+     *
+     * @return true only if status code is 429 (rate limiting)
+     */
+    @Override
+    public boolean isRetryable() {
+        return getStatusCode() == TOO_MANY_REQUESTS;
+    }
+    
+    /**
+     * Check if this is a 400 Bad Request error.
+     *
+     * @return true if status code is 400
+     */
+    public boolean isBadRequest() {
+        return getStatusCode() == 400;
+    }
+    
+    /**
+     * Check if this is a 401 Unauthorized error.
+     * Usually indicates missing or invalid API key.
+     *
+     * @return true if status code is 401
+     */
+    public boolean isUnauthorized() {
+        return getStatusCode() == 401;
+    }
+    
+    /**
+     * Check if this is a 403 Forbidden error.
+     * Usually indicates valid auth but insufficient permissions.
+     *
+     * @return true if status code is 403
+     */
+    public boolean isForbidden() {
+        return getStatusCode() == 403;
+    }
+    
+    /**
+     * Check if this is a 404 Not Found error.
+     *
+     * @return true if status code is 404
+     */
+    public boolean isNotFound() {
+        return getStatusCode() == 404;
+    }
+    
+    /**
+     * Check if this is a 405 Method Not Allowed error.
+     *
+     * @return true if status code is 405
+     */
+    public boolean isMethodNotAllowed() {
+        return getStatusCode() == 405;
+    }
+    
+    /**
+     * Check if this is a 409 Conflict error.
+     *
+     * @return true if status code is 409
+     */
+    public boolean isConflict() {
+        return getStatusCode() == 409;
+    }
+    
+    /**
+     * Check if this is a 422 Unprocessable Entity error.
+     * Usually indicates validation errors.
+     *
+     * @return true if status code is 422
+     */
+    public boolean isUnprocessableEntity() {
+        return getStatusCode() == 422;
+    }
+    
+    /**
+     * Check if this is a 429 Too Many Requests error.
+     * This error is retryable after waiting for the rate limit to reset.
+     *
+     * @return true if status code is 429
+     */
+    public boolean isTooManyRequests() {
+        return getStatusCode() == TOO_MANY_REQUESTS;
+    }
+    
+    /**
+     * Get the retry-after delay in milliseconds from response headers.
+     * This is typically provided with 429 responses.
+     *
+     * @return the retry delay in milliseconds, or -1 if not available
+     */
+    public long getRetryAfterMs() {
+        Response response = getResponse();
+        if (response == null) {
+            return -1;
+        }
+        
+        String retryAfter = response.getHeader("Retry-After");
+        if (retryAfter == null) {
+            return -1;
+        }
+        
+        try {
+            // Retry-After can be seconds
+            int seconds = Integer.parseInt(retryAfter.trim());
+            return seconds * 1000L;
+        } catch (NumberFormatException e) {
+            // Could be HTTP-date format, return -1 for simplicity
+            return -1;
+        }
+    }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/ConfigurationException.java b/src/main/java/com/chargebee/v4/exceptions/ConfigurationException.java
new file mode 100644
index 00000000..4a75e378
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/ConfigurationException.java
@@ -0,0 +1,79 @@
+package com.chargebee.v4.exceptions;
+
+/**
+ * Exception thrown when there's an issue with SDK configuration.
+ * 
+ * <p>This extends {@link ChargebeeException} to allow fluent builder usage
+ * without requiring try-catch blocks during client setup.
+ * 
+ * <p>Common causes:
+ * <ul>
+ *   <li>Missing required configuration (e.g., API key)</li>
+ *   <li>Invalid configuration values</li>
+ *   <li>Malformed URLs</li>
+ * </ul>
+ * 
+ * <p>Example:
+ * <pre>{@code
+ * try {
+ *     ChargebeeClient client = ChargebeeClient.builder()
+ *         .siteName("my-site")
+ *         // Missing apiKey!
+ *         .build();
+ * } catch (ConfigurationException e) {
+ *     System.err.println("Configuration error: " + e.getMessage());
+ * }
+ * }</pre>
+ * 
+ * <p>Note: This exception is NOT retryable as it indicates a programming error
+ * that must be fixed in the code.
+ */
+public class ConfigurationException extends ChargebeeException {
+    
+    /**
+     * Creates a ConfigurationException with a message.
+     *
+     * @param message descriptive error message
+     */
+    public ConfigurationException(String message) {
+        super(message);
+    }
+    
+    /**
+     * Creates a ConfigurationException with a message and cause.
+     *
+     * @param message descriptive error message
+     * @param cause the underlying cause
+     */
+    public ConfigurationException(String message, Throwable cause) {
+        super(message, cause);
+    }
+    
+    /**
+     * Configuration errors are never retryable as they indicate
+     * programming errors that must be fixed in the code.
+     *
+     * @return false always
+     */
+    public boolean isRetryable() {
+        return false;
+    }
+    
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append(getClass().getSimpleName());
+        sb.append("{message='").append(getMessage()).append("'");
+        
+        Throwable cause = getCause();
+        if (cause != null) {
+            sb.append(", cause=").append(cause.getClass().getSimpleName());
+            if (cause.getMessage() != null) {
+                sb.append("('").append(cause.getMessage()).append("')");
+            }
+        }
+        
+        sb.append("}");
+        return sb.toString();
+    }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/ErrorType.java b/src/main/java/com/chargebee/v4/exceptions/ErrorType.java
new file mode 100644
index 00000000..3bcac638
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/ErrorType.java
@@ -0,0 +1,71 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.exceptions;
+
+/** Types of errors returned by the Chargebee API */
+public enum ErrorType {
+
+  /** API error code: invalid_request */
+  INVALID_REQUEST("invalid_request"),
+
+  /** API error code: untyped */
+  UNTYPED("untyped"),
+
+  /** API error code: payment */
+  PAYMENT("payment"),
+
+  /** API error code: operation_failed */
+  OPERATION_FAILED("operation_failed"),
+
+  /**
+   * Represents an unknown or unrecognized error code. This allows forward compatibility when new
+   * error codes are added.
+   */
+  _UNKNOWN(null);
+
+  private final String value;
+
+  ErrorType(String value) {
+    this.value = value;
+  }
+
+  /**
+   * Get the string value of this error code as returned by the API.
+   *
+   * @return the API string value, or null for _UNKNOWN
+   */
+  public String getValue() {
+    return value;
+  }
+
+  /**
+   * Convert an API string value to the corresponding enum constant. Returns _UNKNOWN for
+   * unrecognized values to ensure forward compatibility.
+   *
+   * @param value the API string value
+   * @return the corresponding enum constant, or _UNKNOWN if not recognized
+   */
+  public static ErrorType fromString(String value) {
+    if (value == null) {
+      return _UNKNOWN;
+    }
+    for (ErrorType enumValue : ErrorType.values()) {
+      if (enumValue.value != null && enumValue.value.equals(value)) {
+        return enumValue;
+      }
+    }
+    return _UNKNOWN;
+  }
+
+  /**
+   * Check if this error code is a known (non-unknown) value.
+   *
+   * @return true if this is a recognized error code
+   */
+  public boolean isKnown() {
+    return this != _UNKNOWN;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/HttpException.java b/src/main/java/com/chargebee/v4/exceptions/HttpException.java
new file mode 100644
index 00000000..7db1e459
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/HttpException.java
@@ -0,0 +1,152 @@
+package com.chargebee.v4.exceptions;
+
+import com.chargebee.v4.transport.Request;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Base exception for HTTP status code errors (4xx, 5xx).
+ * 
+ * <p>This exception provides access to the full HTTP context:
+ * <ul>
+ *   <li>{@link #getStatusCode()} - The HTTP status code</li>
+ *   <li>{@link #getRequest()} - The original HTTP request</li>
+ *   <li>{@link #getResponse()} - The HTTP response</li>
+ *   <li>{@link #getResponseBody()} - The response body as string</li>
+ *   <li>{@link #getUrl()} - Convenience method for request URL</li>
+ *   <li>{@link #getHttpMethod()} - Convenience method for HTTP method</li>
+ * </ul>
+ * 
+ * <p>Exception hierarchy:
+ * <pre>
+ * HttpException
+ * ├── ClientErrorException (4xx errors)
+ * ├── ServerErrorException (5xx errors)
+ * └── APIException         (Chargebee API errors with structured response)
+ * </pre>
+ * 
+ * <p>Example usage:
+ * <pre>{@code
+ * try {
+ *     client.customers().retrieve("invalid_id");
+ * } catch (HttpException e) {
+ *     System.err.println("HTTP " + e.getStatusCode() + ": " + e.getMessage());
+ *     System.err.println("URL: " + e.getUrl());
+ *     System.err.println("Response: " + e.getResponseBody());
+ *     
+ *     if (e.isRetryable()) {
+ *         // Retry logic
+ *     }
+ * }
+ * }</pre>
+ */
+public class HttpException extends TransportException {
+    
+    private final int statusCode;
+    private final Response response;
+    
+    /**
+     * Creates an HttpException with full context.
+     *
+     * @param statusCode the HTTP status code
+     * @param message descriptive error message
+     * @param request the original HTTP request
+     * @param response the HTTP response
+     */
+    public HttpException(int statusCode, String message, Request request, Response response) {
+        super(message, request);
+        this.statusCode = statusCode;
+        this.response = response;
+    }
+    
+    /**
+     * Creates an HttpException with full context and cause.
+     *
+     * @param statusCode the HTTP status code
+     * @param message descriptive error message
+     * @param request the original HTTP request
+     * @param response the HTTP response
+     * @param cause the underlying cause
+     */
+    public HttpException(int statusCode, String message, Request request, Response response, Throwable cause) {
+        super(message, cause, request);
+        this.statusCode = statusCode;
+        this.response = response;
+    }
+    
+    /**
+     * Get the HTTP status code.
+     *
+     * @return the HTTP status code (e.g., 400, 404, 500)
+     */
+    public int getStatusCode() {
+        return statusCode;
+    }
+    
+    /**
+     * Get the full HTTP response.
+     *
+     * @return the response object
+     */
+    public Response getResponse() {
+        return response;
+    }
+    
+    /**
+     * Get the response body as string for error details.
+     *
+     * @return the response body, or null if response is not available
+     */
+    public String getResponseBody() {
+        return response != null ? response.getBodyAsString() : null;
+    }
+    
+    /**
+     * Check if this HTTP error is retryable.
+     * 
+     * <p>By default, HTTP errors are not retryable. Subclasses override this:
+     * <ul>
+     *   <li>{@link ServerErrorException} - true for most 5xx (except 501)</li>
+     *   <li>{@link ClientErrorException} - true only for 429 (rate limiting)</li>
+     * </ul>
+     *
+     * @return false by default
+     */
+    @Override
+    public boolean isRetryable() {
+        return false;
+    }
+    
+    /**
+     * Check if this is a client error (4xx status code).
+     *
+     * @return true if status code is 4xx
+     */
+    public boolean isClientError() {
+        return statusCode >= 400 && statusCode < 500;
+    }
+    
+    /**
+     * Check if this is a server error (5xx status code).
+     *
+     * @return true if status code is 5xx
+     */
+    public boolean isServerError() {
+        return statusCode >= 500 && statusCode < 600;
+    }
+    
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append(getClass().getSimpleName());
+        sb.append("{statusCode=").append(statusCode);
+        sb.append(", message='").append(getMessage()).append("'");
+        
+        if (getRequest() != null) {
+            sb.append(", method='").append(getHttpMethod()).append("'");
+            sb.append(", url='").append(getUrl()).append("'");
+        }
+        
+        sb.append("}");
+        return sb.toString();
+    }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/InvalidRequestException.java b/src/main/java/com/chargebee/v4/exceptions/InvalidRequestException.java
index 6ff69d00..b9e14b51 100644
--- a/src/main/java/com/chargebee/v4/exceptions/InvalidRequestException.java
+++ b/src/main/java/com/chargebee/v4/exceptions/InvalidRequestException.java
@@ -1,15 +1,51 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
 package com.chargebee.v4.exceptions;
 
+import com.chargebee.v4.exceptions.codes.ApiErrorCode;
+import com.chargebee.v4.transport.Request;
 import com.chargebee.v4.transport.Response;
 
 /**
- * Exception thrown for invalid request errors (type: "invalid_request").
- * Examples include invalid parameters, missing required fields, validation errors, etc.
+ * Exception thrown for invalid request errors including validation failures.
+ *
+ * <p>This exception is thrown when the API returns an error with type: "invalid_request"
+ *
+ * <p>Example usage:
+ *
+ * <pre>{@code
+ * try {
+ *     // API call
+ * } catch (InvalidRequestException e) {
+ *     System.out.println("Error code: " + e.getApiErrorCodeRaw());
+ *     System.out.println("Message: " + e.getMessage());
+ *     System.out.println("Params: " + e.getParams());
+ *     System.out.println("Request URL: " + e.getRequest().getUrl());
+ * }
+ * }</pre>
  */
 public class InvalidRequestException extends APIException {
 
-    public InvalidRequestException(int statusCode, String type, String apiErrorCode, String message,
-                                  String jsonResponse, Response response) {
-        super(statusCode, type, apiErrorCode, message, jsonResponse, response);
-    }
+  public InvalidRequestException(
+      int statusCode,
+      String type,
+      ApiErrorCode apiErrorCode,
+      String message,
+      String jsonResponse,
+      Request request,
+      Response response) {
+    super(statusCode, type, apiErrorCode, message, jsonResponse, request, response);
+  }
+
+  /**
+   * Get the error type value that this exception represents.
+   *
+   * @return the error type string "invalid_request"
+   */
+  public static String getExpectedErrorType() {
+    return "invalid_request";
+  }
 }
diff --git a/src/main/java/com/chargebee/v4/exceptions/NetworkException.java b/src/main/java/com/chargebee/v4/exceptions/NetworkException.java
new file mode 100644
index 00000000..3c868d24
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/NetworkException.java
@@ -0,0 +1,65 @@
+package com.chargebee.v4.exceptions;
+
+import com.chargebee.v4.transport.Request;
+
+/**
+ * Exception for network connectivity issues such as DNS failures, connection refused,
+ * or general I/O errors during HTTP communication.
+ * 
+ * <p>This exception inherits request context from {@link TransportException}:
+ * <ul>
+ *   <li>{@link #getUrl()} - The URL that was being accessed</li>
+ *   <li>{@link #getHttpMethod()} - The HTTP method (GET, POST, etc.)</li>
+ *   <li>{@link #getRequest()} - The full request object if needed</li>
+ * </ul>
+ * 
+ * <p>Example usage:
+ * <pre>{@code
+ * try {
+ *     client.customers().list();
+ * } catch (NetworkException e) {
+ *     System.err.println("Failed to connect to: " + e.getUrl());
+ *     System.err.println("Method: " + e.getHttpMethod());
+ *     System.err.println("Cause: " + e.getCause().getMessage());
+ *     
+ *     if (e.isRetryable()) {
+ *         // Implement retry logic
+ *     }
+ * }
+ * }</pre>
+ */
+public class NetworkException extends TransportException {
+    
+    /**
+     * Creates a NetworkException with request context.
+     *
+     * @param message descriptive error message
+     * @param cause the underlying cause (e.g., IOException)
+     * @param request the HTTP request that failed
+     */
+    public NetworkException(String message, Throwable cause, Request request) {
+        super(message, cause, request);
+    }
+    
+    /**
+     * Creates a NetworkException without request context.
+     * Prefer {@link #NetworkException(String, Throwable, Request)} when request is available.
+     *
+     * @param message descriptive error message
+     * @param cause the underlying cause
+     */
+    public NetworkException(String message, Throwable cause) {
+        super(message, cause);
+    }
+    
+    /**
+     * Network errors are generally retryable as they may be transient
+     * (e.g., temporary DNS issues, network hiccups).
+     *
+     * @return true, indicating this error is typically retryable
+     */
+    @Override
+    public boolean isRetryable() {
+        return true;
+    }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/OperationFailedException.java b/src/main/java/com/chargebee/v4/exceptions/OperationFailedException.java
index f219ccda..e8c5f249 100644
--- a/src/main/java/com/chargebee/v4/exceptions/OperationFailedException.java
+++ b/src/main/java/com/chargebee/v4/exceptions/OperationFailedException.java
@@ -1,15 +1,51 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
 package com.chargebee.v4.exceptions;
 
+import com.chargebee.v4.exceptions.codes.ApiErrorCode;
+import com.chargebee.v4.transport.Request;
 import com.chargebee.v4.transport.Response;
 
 /**
- * Exception thrown when an operation fails (type: "operation_failed").
- * Examples include business logic violations, state conflicts, etc.
+ * Exception thrown when an operation fails due to business logic constraints.
+ *
+ * <p>This exception is thrown when the API returns an error with type: "operation_failed"
+ *
+ * <p>Example usage:
+ *
+ * <pre>{@code
+ * try {
+ *     // API call
+ * } catch (OperationFailedException e) {
+ *     System.out.println("Error code: " + e.getApiErrorCodeRaw());
+ *     System.out.println("Message: " + e.getMessage());
+ *     System.out.println("Params: " + e.getParams());
+ *     System.out.println("Request URL: " + e.getRequest().getUrl());
+ * }
+ * }</pre>
  */
 public class OperationFailedException extends APIException {
 
-    public OperationFailedException(int statusCode, String type, String apiErrorCode, String message,
-                                   String jsonResponse, Response response) {
-        super(statusCode, type, apiErrorCode, message, jsonResponse, response);
-    }
+  public OperationFailedException(
+      int statusCode,
+      String type,
+      ApiErrorCode apiErrorCode,
+      String message,
+      String jsonResponse,
+      Request request,
+      Response response) {
+    super(statusCode, type, apiErrorCode, message, jsonResponse, request, response);
+  }
+
+  /**
+   * Get the error type value that this exception represents.
+   *
+   * @return the error type string "operation_failed"
+   */
+  public static String getExpectedErrorType() {
+    return "operation_failed";
+  }
 }
diff --git a/src/main/java/com/chargebee/v4/exceptions/PaymentException.java b/src/main/java/com/chargebee/v4/exceptions/PaymentException.java
index 8256a7ed..76cda1fc 100644
--- a/src/main/java/com/chargebee/v4/exceptions/PaymentException.java
+++ b/src/main/java/com/chargebee/v4/exceptions/PaymentException.java
@@ -1,15 +1,51 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
 package com.chargebee.v4.exceptions;
 
+import com.chargebee.v4.exceptions.codes.ApiErrorCode;
+import com.chargebee.v4.transport.Request;
 import com.chargebee.v4.transport.Response;
 
 /**
- * Exception thrown for payment-related errors (type: "payment").
- * Examples include card declined, insufficient funds, etc.
+ * Exception thrown for payment-related errors.
+ *
+ * <p>This exception is thrown when the API returns an error with type: "payment"
+ *
+ * <p>Example usage:
+ *
+ * <pre>{@code
+ * try {
+ *     // API call
+ * } catch (PaymentException e) {
+ *     System.out.println("Error code: " + e.getApiErrorCodeRaw());
+ *     System.out.println("Message: " + e.getMessage());
+ *     System.out.println("Params: " + e.getParams());
+ *     System.out.println("Request URL: " + e.getRequest().getUrl());
+ * }
+ * }</pre>
  */
 public class PaymentException extends APIException {
 
-    public PaymentException(int statusCode, String type, String apiErrorCode, String message,
-                           String jsonResponse, Response response) {
-        super(statusCode, type, apiErrorCode, message, jsonResponse, response);
-    }
+  public PaymentException(
+      int statusCode,
+      String type,
+      ApiErrorCode apiErrorCode,
+      String message,
+      String jsonResponse,
+      Request request,
+      Response response) {
+    super(statusCode, type, apiErrorCode, message, jsonResponse, request, response);
+  }
+
+  /**
+   * Get the error type value that this exception represents.
+   *
+   * @return the error type string "payment"
+   */
+  public static String getExpectedErrorType() {
+    return "payment";
+  }
 }
diff --git a/src/main/java/com/chargebee/v4/exceptions/ServerErrorException.java b/src/main/java/com/chargebee/v4/exceptions/ServerErrorException.java
new file mode 100644
index 00000000..a2626c3c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/ServerErrorException.java
@@ -0,0 +1,122 @@
+package com.chargebee.v4.exceptions;
+
+import com.chargebee.v4.transport.Request;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Exception for 5xx HTTP status codes (server errors).
+ * 
+ * <p>Server errors indicate issues on the server side that may be temporary:
+ * <ul>
+ *   <li>500 Internal Server Error - Unexpected server error</li>
+ *   <li>501 Not Implemented - Feature not supported (not retryable)</li>
+ *   <li>502 Bad Gateway - Gateway/proxy error</li>
+ *   <li>503 Service Unavailable - Server overloaded or maintenance</li>
+ *   <li>504 Gateway Timeout - Gateway/proxy timeout</li>
+ * </ul>
+ * 
+ * <p>Most 5xx errors are retryable (except 501):
+ * <pre>{@code
+ * try {
+ *     client.customers().list();
+ * } catch (ServerErrorException e) {
+ *     if (e.isRetryable()) {
+ *         // Exponential backoff retry
+ *     } else if (e.isNotImplemented()) {
+ *         // Feature not available
+ *     }
+ * }
+ * }</pre>
+ */
+public class ServerErrorException extends HttpException {
+    
+    /**
+     * Creates a ServerErrorException.
+     *
+     * @param statusCode the HTTP status code (5xx)
+     * @param message descriptive error message
+     * @param request the original HTTP request
+     * @param response the HTTP response
+     */
+    public ServerErrorException(int statusCode, String message, Request request, Response response) {
+        super(statusCode, message, request, response);
+    }
+    
+    /**
+     * Creates a ServerErrorException with cause.
+     *
+     * @param statusCode the HTTP status code (5xx)
+     * @param message descriptive error message
+     * @param request the original HTTP request
+     * @param response the HTTP response
+     * @param cause the underlying cause
+     */
+    public ServerErrorException(int statusCode, String message, Request request, Response response, Throwable cause) {
+        super(statusCode, message, request, response, cause);
+    }
+    
+    /**
+     * Check if this is a 500 Internal Server Error.
+     *
+     * @return true if status code is 500
+     */
+    public boolean isInternalServerError() {
+        return getStatusCode() == 500;
+    }
+    
+    /**
+     * Check if this is a 501 Not Implemented error.
+     * This error is NOT retryable as the feature is not supported.
+     *
+     * @return true if status code is 501
+     */
+    public boolean isNotImplemented() {
+        return getStatusCode() == 501;
+    }
+    
+    /**
+     * Check if this is a 502 Bad Gateway error.
+     *
+     * @return true if status code is 502
+     */
+    public boolean isBadGateway() {
+        return getStatusCode() == 502;
+    }
+    
+    /**
+     * Check if this is a 503 Service Unavailable error.
+     *
+     * @return true if status code is 503
+     */
+    public boolean isServiceUnavailable() {
+        return getStatusCode() == 503;
+    }
+    
+    /**
+     * Check if this is a 504 Gateway Timeout error.
+     *
+     * @return true if status code is 504
+     */
+    public boolean isGatewayTimeout() {
+        return getStatusCode() == 504;
+    }
+    
+    /**
+     * Server errors are generally retryable, except 501 (Not Implemented).
+     * 
+     * <p>Retryable server errors (temporary issues):
+     * <ul>
+     *   <li>500 Internal Server Error</li>
+     *   <li>502 Bad Gateway</li>
+     *   <li>503 Service Unavailable</li>
+     *   <li>504 Gateway Timeout</li>
+     * </ul>
+     *
+     * @return true for all 5xx except 501
+     */
+    @Override
+    public boolean isRetryable() {
+        int code = getStatusCode();
+        return code >= 500 && code != 501;
+    }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/TimeoutException.java b/src/main/java/com/chargebee/v4/exceptions/TimeoutException.java
new file mode 100644
index 00000000..308e2b1a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/TimeoutException.java
@@ -0,0 +1,132 @@
+package com.chargebee.v4.exceptions;
+
+import com.chargebee.v4.transport.Request;
+
+/**
+ * Exception for connection or read timeouts during HTTP communication.
+ * 
+ * <p>This exception inherits request context from {@link TransportException} and adds:
+ * <ul>
+ *   <li>{@link #getTimeoutType()} - Whether it was a "connect" or "read" timeout</li>
+ *   <li>{@link #isConnectTimeout()} / {@link #isReadTimeout()} - Convenient type checks</li>
+ * </ul>
+ * 
+ * <p>Inherited from base class:
+ * <ul>
+ *   <li>{@link #getUrl()} - The URL that was being accessed</li>
+ *   <li>{@link #getHttpMethod()} - The HTTP method (GET, POST, etc.)</li>
+ *   <li>{@link #getRequest()} - The full request object if needed</li>
+ * </ul>
+ * 
+ * <p>Example usage:
+ * <pre>{@code
+ * try {
+ *     client.customers().list();
+ * } catch (TimeoutException e) {
+ *     System.err.println("Timeout type: " + e.getTimeoutType());
+ *     System.err.println("Failed URL: " + e.getUrl());
+ *     
+ *     if (e.isConnectTimeout()) {
+ *         // Server might be down or unreachable
+ *     } else if (e.isReadTimeout()) {
+ *         // Server is slow to respond, consider increasing timeout
+ *     }
+ *     
+ *     if (e.isRetryable()) {
+ *         // Implement retry logic
+ *     }
+ * }
+ * }</pre>
+ */
+public class TimeoutException extends TransportException {
+    
+    /** Timeout type for connection timeouts. */
+    public static final String CONNECT = "connect";
+    
+    /** Timeout type for read timeouts. */
+    public static final String READ = "read";
+    
+    private final String timeoutType;
+    
+    /**
+     * Creates a TimeoutException with request context.
+     *
+     * @param timeoutType the type of timeout ("connect" or "read")
+     * @param message descriptive error message
+     * @param cause the underlying cause
+     * @param request the HTTP request that timed out
+     */
+    public TimeoutException(String timeoutType, String message, Throwable cause, Request request) {
+        super(message, cause, request);
+        this.timeoutType = timeoutType;
+    }
+    
+    /**
+     * Creates a TimeoutException without request context.
+     * Prefer {@link #TimeoutException(String, String, Throwable, Request)} when request is available.
+     *
+     * @param timeoutType the type of timeout ("connect" or "read")
+     * @param message descriptive error message
+     * @param cause the underlying cause
+     */
+    public TimeoutException(String timeoutType, String message, Throwable cause) {
+        super(message, cause);
+        this.timeoutType = timeoutType;
+    }
+    
+    /**
+     * Get the type of timeout that occurred.
+     *
+     * @return "connect" for connection timeouts, "read" for read timeouts
+     */
+    public String getTimeoutType() {
+        return timeoutType;
+    }
+    
+    /**
+     * Check if this was a connection timeout.
+     * Connection timeouts occur when the server cannot be reached within the connect timeout period.
+     *
+     * @return true if this is a connection timeout
+     */
+    public boolean isConnectTimeout() {
+        return CONNECT.equals(timeoutType);
+    }
+    
+    /**
+     * Check if this was a read timeout.
+     * Read timeouts occur when the server doesn't respond within the read timeout period.
+     *
+     * @return true if this is a read timeout
+     */
+    public boolean isReadTimeout() {
+        return READ.equals(timeoutType);
+    }
+    
+    /**
+     * Timeouts are generally retryable as they may be transient
+     * (e.g., temporary server load, network congestion).
+     *
+     * @return true, indicating this error is typically retryable
+     */
+    @Override
+    public boolean isRetryable() {
+        return true;
+    }
+    
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append(getClass().getSimpleName());
+        sb.append("{timeoutType='").append(timeoutType).append("'");
+        sb.append(", message='").append(getMessage()).append("'");
+        
+        if (getRequest() != null) {
+            sb.append(", method='").append(getHttpMethod()).append("'");
+            sb.append(", url='").append(getUrl()).append("'");
+        }
+        
+        sb.append("}");
+        return sb.toString();
+    }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/TransportException.java b/src/main/java/com/chargebee/v4/exceptions/TransportException.java
new file mode 100644
index 00000000..644e05be
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/TransportException.java
@@ -0,0 +1,147 @@
+package com.chargebee.v4.exceptions;
+
+import com.chargebee.v4.transport.Request;
+
+/**
+ * Base exception for all transport-layer failures in the Chargebee SDK.
+ * 
+ * <p>Transport exceptions represent infrastructure-level issues that occur before
+ * or during HTTP communication, such as network errors, timeouts, and HTTP status
+ * code errors.
+ * 
+ * <p>This base class provides common functionality for all transport exceptions:
+ * <ul>
+ *   <li>{@link #getRequest()} - Access to the HTTP request that failed</li>
+ *   <li>{@link #getUrl()} - Convenience method for the request URL</li>
+ *   <li>{@link #getHttpMethod()} - Convenience method for the HTTP method</li>
+ *   <li>{@link #isRetryable()} - Whether this error is typically retryable</li>
+ * </ul>
+ * 
+ * <p>Exception hierarchy:
+ * <pre>
+ * ChargebeeException
+ * └── TransportException
+ *     ├── NetworkException      (DNS failures, connection refused, I/O errors)
+ *     ├── TimeoutException      (connect/read timeouts)
+ *     └── HttpException         (HTTP status code errors: 4xx, 5xx)
+ *         ├── ClientErrorException (4xx)
+ *         ├── ServerErrorException (5xx)
+ *         └── APIException         (Chargebee API errors with structured response)
+ * </pre>
+ */
+public class TransportException extends ChargebeeException {
+    
+    private final Request request;
+    
+    /**
+     * Creates a TransportException with a message only.
+     *
+     * @param message descriptive error message
+     */
+    public TransportException(String message) {
+        super(message);
+        this.request = null;
+    }
+    
+    /**
+     * Creates a TransportException with a message and cause.
+     *
+     * @param message descriptive error message
+     * @param cause the underlying cause
+     */
+    public TransportException(String message, Throwable cause) {
+        super(message, cause);
+        this.request = null;
+    }
+    
+    /**
+     * Creates a TransportException with full context.
+     *
+     * @param message descriptive error message
+     * @param cause the underlying cause (may be null)
+     * @param request the HTTP request that failed (may be null)
+     */
+    public TransportException(String message, Throwable cause, Request request) {
+        super(message, cause);
+        this.request = request;
+    }
+    
+    /**
+     * Creates a TransportException with message and request context.
+     *
+     * @param message descriptive error message
+     * @param request the HTTP request that failed
+     */
+    public TransportException(String message, Request request) {
+        super(message);
+        this.request = request;
+    }
+    
+    /**
+     * Get the HTTP request that failed.
+     * Useful for detailed debugging and logging.
+     *
+     * @return the request object, or null if not available
+     */
+    public Request getRequest() {
+        return request;
+    }
+    
+    /**
+     * Get the URL that was being accessed when the error occurred.
+     *
+     * @return the request URL, or null if request is not available
+     */
+    public String getUrl() {
+        return request != null ? request.getUrl() : null;
+    }
+    
+    /**
+     * Get the HTTP method used for the failed request.
+     *
+     * @return the HTTP method (GET, POST, etc.), or null if request is not available
+     */
+    public String getHttpMethod() {
+        return request != null ? request.getMethod() : null;
+    }
+    
+    /**
+     * Check if this error is typically retryable.
+     * 
+     * <p>Subclasses override this to provide appropriate retry guidance:
+     * <ul>
+     *   <li>{@link NetworkException} - returns true (transient network issues)</li>
+     *   <li>{@link TimeoutException} - returns true (temporary overload)</li>
+     *   <li>{@link ServerErrorException} - returns true for most 5xx (except 501)</li>
+     *   <li>{@link ClientErrorException} - returns true only for 429 (rate limiting)</li>
+     * </ul>
+     *
+     * @return true if retrying the request might succeed, false otherwise
+     */
+    public boolean isRetryable() {
+        return false;
+    }
+    
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append(getClass().getSimpleName());
+        sb.append("{message='").append(getMessage()).append("'");
+        
+        if (request != null) {
+            sb.append(", method='").append(request.getMethod()).append("'");
+            sb.append(", url='").append(request.getUrl()).append("'");
+        }
+        
+        Throwable cause = getCause();
+        if (cause != null) {
+            sb.append(", cause=").append(cause.getClass().getSimpleName());
+            if (cause.getMessage() != null) {
+                sb.append("('").append(cause.getMessage()).append("')");
+            }
+        }
+        
+        sb.append("}");
+        return sb.toString();
+    }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/UbbBatchIngestionInvalidRequestException.java b/src/main/java/com/chargebee/v4/exceptions/UbbBatchIngestionInvalidRequestException.java
index 90cfedb3..ab940d8e 100644
--- a/src/main/java/com/chargebee/v4/exceptions/UbbBatchIngestionInvalidRequestException.java
+++ b/src/main/java/com/chargebee/v4/exceptions/UbbBatchIngestionInvalidRequestException.java
@@ -1,5 +1,7 @@
 package com.chargebee.v4.exceptions;
 
+import com.chargebee.v4.exceptions.codes.ApiErrorCode;
+import com.chargebee.v4.transport.Request;
 import com.chargebee.v4.transport.Response;
 
 /**
@@ -8,8 +10,8 @@
  */
 public class UbbBatchIngestionInvalidRequestException extends APIException {
 
-    public UbbBatchIngestionInvalidRequestException(int statusCode, String type, String apiErrorCode,
-                                                   String message, String jsonResponse, Response response) {
-        super(statusCode, type, apiErrorCode, message, jsonResponse, response);
+    public UbbBatchIngestionInvalidRequestException(int statusCode, String type, ApiErrorCode apiErrorCode,
+                                                   String message, String jsonResponse, Request request, Response response) {
+        super(statusCode, type, apiErrorCode, message, jsonResponse, request, response);
     }
 }
diff --git a/src/main/java/com/chargebee/v4/exceptions/codes/ApiErrorCode.java b/src/main/java/com/chargebee/v4/exceptions/codes/ApiErrorCode.java
new file mode 100644
index 00000000..7469f64d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/codes/ApiErrorCode.java
@@ -0,0 +1,46 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.exceptions.codes;
+
+/**
+ * Common interface for all API error code enums.
+ *
+ * <p>Each HTTP status code has its own enum implementing this interface:
+ *
+ * <ul>
+ *   <li>{@link BadRequestApiErrorCode} - 400 errors
+ *   <li>{@link UnauthorizedApiErrorCode} - 401 errors
+ *   <li>{@link ForbiddenApiErrorCode} - 403 errors
+ *   <li>{@link NotFoundApiErrorCode} - 404 errors
+ *   <li>etc.
+ * </ul>
+ *
+ * <p>Use this interface when you need to handle error codes generically, or use the specific enum
+ * class for type-safe handling of status-specific codes.
+ */
+public interface ApiErrorCode {
+
+  /**
+   * Get the string value of this error code as returned by the API.
+   *
+   * @return the API string value, or null for unknown codes
+   */
+  String getValue();
+
+  /**
+   * Check if this error code is a known (non-unknown) value.
+   *
+   * @return true if this is a recognized error code
+   */
+  boolean isKnown();
+
+  /**
+   * Get the enum name (e.g., "DUPLICATE_ENTRY", "PAYMENT_PROCESSING_FAILED").
+   *
+   * @return the enum constant name
+   */
+  String name();
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/codes/BadRequestApiErrorCode.java b/src/main/java/com/chargebee/v4/exceptions/codes/BadRequestApiErrorCode.java
new file mode 100644
index 00000000..104e06df
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/codes/BadRequestApiErrorCode.java
@@ -0,0 +1,97 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.exceptions.codes;
+
+/** API error codes for HTTP 400 responses */
+public enum BadRequestApiErrorCode implements ApiErrorCode {
+
+  /** API error code: payment_intent_invalid_amount */
+  PAYMENT_INTENT_INVALID_AMOUNT("payment_intent_invalid_amount"),
+
+  /** API error code: configuration_incompatible */
+  CONFIGURATION_INCOMPATIBLE("configuration_incompatible"),
+
+  /** API error code: payment_intent_invalid */
+  PAYMENT_INTENT_INVALID("payment_intent_invalid"),
+
+  /** API error code: invalid_request */
+  INVALID_REQUEST("invalid_request"),
+
+  /** API error code: payment_method_verification_failed */
+  PAYMENT_METHOD_VERIFICATION_FAILED("payment_method_verification_failed"),
+
+  /** API error code: payment_processing_failed */
+  PAYMENT_PROCESSING_FAILED("payment_processing_failed"),
+
+  /** API error code: resource_limit_exhausted */
+  RESOURCE_LIMIT_EXHAUSTED("resource_limit_exhausted"),
+
+  /** API error code: duplicate_entry */
+  DUPLICATE_ENTRY("duplicate_entry"),
+
+  /** API error code: param_wrong_value */
+  PARAM_WRONG_VALUE("param_wrong_value"),
+
+  /** API error code: payment_method_not_present */
+  PAYMENT_METHOD_NOT_PRESENT("payment_method_not_present"),
+
+  /** API error code: resource_limit_exceeded */
+  RESOURCE_LIMIT_EXCEEDED("resource_limit_exceeded"),
+
+  /** API error code: payment_gateway_currency_incompatible */
+  PAYMENT_GATEWAY_CURRENCY_INCOMPATIBLE("payment_gateway_currency_incompatible"),
+
+  /**
+   * Represents an unknown or unrecognized error code. This allows forward compatibility when new
+   * error codes are added.
+   */
+  _UNKNOWN(null);
+
+  private final String value;
+
+  BadRequestApiErrorCode(String value) {
+    this.value = value;
+  }
+
+  /**
+   * Get the string value of this error code as returned by the API.
+   *
+   * @return the API string value, or null for _UNKNOWN
+   */
+  @Override
+  public String getValue() {
+    return value;
+  }
+
+  /**
+   * Convert an API string value to the corresponding enum constant. Returns _UNKNOWN for
+   * unrecognized values to ensure forward compatibility.
+   *
+   * @param value the API string value
+   * @return the corresponding enum constant, or _UNKNOWN if not recognized
+   */
+  public static BadRequestApiErrorCode fromString(String value) {
+    if (value == null) {
+      return _UNKNOWN;
+    }
+    for (BadRequestApiErrorCode enumValue : BadRequestApiErrorCode.values()) {
+      if (enumValue.value != null && enumValue.value.equals(value)) {
+        return enumValue;
+      }
+    }
+    return _UNKNOWN;
+  }
+
+  /**
+   * Check if this error code is a known (non-unknown) value.
+   *
+   * @return true if this is a recognized error code
+   */
+  @Override
+  public boolean isKnown() {
+    return this != _UNKNOWN;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/codes/ConflictApiErrorCode.java b/src/main/java/com/chargebee/v4/exceptions/codes/ConflictApiErrorCode.java
new file mode 100644
index 00000000..cd8504ed
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/codes/ConflictApiErrorCode.java
@@ -0,0 +1,64 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.exceptions.codes;
+
+/** API error codes for HTTP 409 responses */
+public enum ConflictApiErrorCode implements ApiErrorCode {
+
+  /** API error code: invalid_state_for_request */
+  INVALID_STATE_FOR_REQUEST("invalid_state_for_request"),
+
+  /**
+   * Represents an unknown or unrecognized error code. This allows forward compatibility when new
+   * error codes are added.
+   */
+  _UNKNOWN(null);
+
+  private final String value;
+
+  ConflictApiErrorCode(String value) {
+    this.value = value;
+  }
+
+  /**
+   * Get the string value of this error code as returned by the API.
+   *
+   * @return the API string value, or null for _UNKNOWN
+   */
+  @Override
+  public String getValue() {
+    return value;
+  }
+
+  /**
+   * Convert an API string value to the corresponding enum constant. Returns _UNKNOWN for
+   * unrecognized values to ensure forward compatibility.
+   *
+   * @param value the API string value
+   * @return the corresponding enum constant, or _UNKNOWN if not recognized
+   */
+  public static ConflictApiErrorCode fromString(String value) {
+    if (value == null) {
+      return _UNKNOWN;
+    }
+    for (ConflictApiErrorCode enumValue : ConflictApiErrorCode.values()) {
+      if (enumValue.value != null && enumValue.value.equals(value)) {
+        return enumValue;
+      }
+    }
+    return _UNKNOWN;
+  }
+
+  /**
+   * Check if this error code is a known (non-unknown) value.
+   *
+   * @return true if this is a recognized error code
+   */
+  @Override
+  public boolean isKnown() {
+    return this != _UNKNOWN;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/codes/ForbiddenApiErrorCode.java b/src/main/java/com/chargebee/v4/exceptions/codes/ForbiddenApiErrorCode.java
new file mode 100644
index 00000000..9d9d425c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/codes/ForbiddenApiErrorCode.java
@@ -0,0 +1,67 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.exceptions.codes;
+
+/** API error codes for HTTP 403 responses */
+public enum ForbiddenApiErrorCode implements ApiErrorCode {
+
+  /** API error code: request_blocked */
+  REQUEST_BLOCKED("request_blocked"),
+
+  /** API error code: api_authorization_failed */
+  API_AUTHORIZATION_FAILED("api_authorization_failed"),
+
+  /**
+   * Represents an unknown or unrecognized error code. This allows forward compatibility when new
+   * error codes are added.
+   */
+  _UNKNOWN(null);
+
+  private final String value;
+
+  ForbiddenApiErrorCode(String value) {
+    this.value = value;
+  }
+
+  /**
+   * Get the string value of this error code as returned by the API.
+   *
+   * @return the API string value, or null for _UNKNOWN
+   */
+  @Override
+  public String getValue() {
+    return value;
+  }
+
+  /**
+   * Convert an API string value to the corresponding enum constant. Returns _UNKNOWN for
+   * unrecognized values to ensure forward compatibility.
+   *
+   * @param value the API string value
+   * @return the corresponding enum constant, or _UNKNOWN if not recognized
+   */
+  public static ForbiddenApiErrorCode fromString(String value) {
+    if (value == null) {
+      return _UNKNOWN;
+    }
+    for (ForbiddenApiErrorCode enumValue : ForbiddenApiErrorCode.values()) {
+      if (enumValue.value != null && enumValue.value.equals(value)) {
+        return enumValue;
+      }
+    }
+    return _UNKNOWN;
+  }
+
+  /**
+   * Check if this error code is a known (non-unknown) value.
+   *
+   * @return true if this is a recognized error code
+   */
+  @Override
+  public boolean isKnown() {
+    return this != _UNKNOWN;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/codes/InternalServerErrorApiErrorCode.java b/src/main/java/com/chargebee/v4/exceptions/codes/InternalServerErrorApiErrorCode.java
new file mode 100644
index 00000000..d15bc01c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/codes/InternalServerErrorApiErrorCode.java
@@ -0,0 +1,64 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.exceptions.codes;
+
+/** API error codes for HTTP 500 responses */
+public enum InternalServerErrorApiErrorCode implements ApiErrorCode {
+
+  /** API error code: internal_error */
+  INTERNAL_ERROR("internal_error"),
+
+  /**
+   * Represents an unknown or unrecognized error code. This allows forward compatibility when new
+   * error codes are added.
+   */
+  _UNKNOWN(null);
+
+  private final String value;
+
+  InternalServerErrorApiErrorCode(String value) {
+    this.value = value;
+  }
+
+  /**
+   * Get the string value of this error code as returned by the API.
+   *
+   * @return the API string value, or null for _UNKNOWN
+   */
+  @Override
+  public String getValue() {
+    return value;
+  }
+
+  /**
+   * Convert an API string value to the corresponding enum constant. Returns _UNKNOWN for
+   * unrecognized values to ensure forward compatibility.
+   *
+   * @param value the API string value
+   * @return the corresponding enum constant, or _UNKNOWN if not recognized
+   */
+  public static InternalServerErrorApiErrorCode fromString(String value) {
+    if (value == null) {
+      return _UNKNOWN;
+    }
+    for (InternalServerErrorApiErrorCode enumValue : InternalServerErrorApiErrorCode.values()) {
+      if (enumValue.value != null && enumValue.value.equals(value)) {
+        return enumValue;
+      }
+    }
+    return _UNKNOWN;
+  }
+
+  /**
+   * Check if this error code is a known (non-unknown) value.
+   *
+   * @return true if this is a recognized error code
+   */
+  @Override
+  public boolean isKnown() {
+    return this != _UNKNOWN;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/codes/MethodNotAllowedApiErrorCode.java b/src/main/java/com/chargebee/v4/exceptions/codes/MethodNotAllowedApiErrorCode.java
new file mode 100644
index 00000000..17ead7f9
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/codes/MethodNotAllowedApiErrorCode.java
@@ -0,0 +1,64 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.exceptions.codes;
+
+/** API error codes for HTTP 405 responses */
+public enum MethodNotAllowedApiErrorCode implements ApiErrorCode {
+
+  /** API error code: http_method_not_supported */
+  HTTP_METHOD_NOT_SUPPORTED("http_method_not_supported"),
+
+  /**
+   * Represents an unknown or unrecognized error code. This allows forward compatibility when new
+   * error codes are added.
+   */
+  _UNKNOWN(null);
+
+  private final String value;
+
+  MethodNotAllowedApiErrorCode(String value) {
+    this.value = value;
+  }
+
+  /**
+   * Get the string value of this error code as returned by the API.
+   *
+   * @return the API string value, or null for _UNKNOWN
+   */
+  @Override
+  public String getValue() {
+    return value;
+  }
+
+  /**
+   * Convert an API string value to the corresponding enum constant. Returns _UNKNOWN for
+   * unrecognized values to ensure forward compatibility.
+   *
+   * @param value the API string value
+   * @return the corresponding enum constant, or _UNKNOWN if not recognized
+   */
+  public static MethodNotAllowedApiErrorCode fromString(String value) {
+    if (value == null) {
+      return _UNKNOWN;
+    }
+    for (MethodNotAllowedApiErrorCode enumValue : MethodNotAllowedApiErrorCode.values()) {
+      if (enumValue.value != null && enumValue.value.equals(value)) {
+        return enumValue;
+      }
+    }
+    return _UNKNOWN;
+  }
+
+  /**
+   * Check if this error code is a known (non-unknown) value.
+   *
+   * @return true if this is a recognized error code
+   */
+  @Override
+  public boolean isKnown() {
+    return this != _UNKNOWN;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/codes/NotFoundApiErrorCode.java b/src/main/java/com/chargebee/v4/exceptions/codes/NotFoundApiErrorCode.java
new file mode 100644
index 00000000..1818b277
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/codes/NotFoundApiErrorCode.java
@@ -0,0 +1,67 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.exceptions.codes;
+
+/** API error codes for HTTP 404 responses */
+public enum NotFoundApiErrorCode implements ApiErrorCode {
+
+  /** API error code: resource_not_found */
+  RESOURCE_NOT_FOUND("resource_not_found"),
+
+  /** API error code: site_not_found */
+  SITE_NOT_FOUND("site_not_found"),
+
+  /**
+   * Represents an unknown or unrecognized error code. This allows forward compatibility when new
+   * error codes are added.
+   */
+  _UNKNOWN(null);
+
+  private final String value;
+
+  NotFoundApiErrorCode(String value) {
+    this.value = value;
+  }
+
+  /**
+   * Get the string value of this error code as returned by the API.
+   *
+   * @return the API string value, or null for _UNKNOWN
+   */
+  @Override
+  public String getValue() {
+    return value;
+  }
+
+  /**
+   * Convert an API string value to the corresponding enum constant. Returns _UNKNOWN for
+   * unrecognized values to ensure forward compatibility.
+   *
+   * @param value the API string value
+   * @return the corresponding enum constant, or _UNKNOWN if not recognized
+   */
+  public static NotFoundApiErrorCode fromString(String value) {
+    if (value == null) {
+      return _UNKNOWN;
+    }
+    for (NotFoundApiErrorCode enumValue : NotFoundApiErrorCode.values()) {
+      if (enumValue.value != null && enumValue.value.equals(value)) {
+        return enumValue;
+      }
+    }
+    return _UNKNOWN;
+  }
+
+  /**
+   * Check if this error code is a known (non-unknown) value.
+   *
+   * @return true if this is a recognized error code
+   */
+  @Override
+  public boolean isKnown() {
+    return this != _UNKNOWN;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/codes/ServiceUnavailableApiErrorCode.java b/src/main/java/com/chargebee/v4/exceptions/codes/ServiceUnavailableApiErrorCode.java
new file mode 100644
index 00000000..6e1b4121
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/codes/ServiceUnavailableApiErrorCode.java
@@ -0,0 +1,73 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.exceptions.codes;
+
+/** API error codes for HTTP 503 responses */
+public enum ServiceUnavailableApiErrorCode implements ApiErrorCode {
+
+  /** API error code: db_connection_failure */
+  DB_CONNECTION_FAILURE("db_connection_failure"),
+
+  /** API error code: site_read_only_mode */
+  SITE_READ_ONLY_MODE("site_read_only_mode"),
+
+  /** API error code: site_not_ready */
+  SITE_NOT_READY("site_not_ready"),
+
+  /** API error code: internal_temporary_error */
+  INTERNAL_TEMPORARY_ERROR("internal_temporary_error"),
+
+  /**
+   * Represents an unknown or unrecognized error code. This allows forward compatibility when new
+   * error codes are added.
+   */
+  _UNKNOWN(null);
+
+  private final String value;
+
+  ServiceUnavailableApiErrorCode(String value) {
+    this.value = value;
+  }
+
+  /**
+   * Get the string value of this error code as returned by the API.
+   *
+   * @return the API string value, or null for _UNKNOWN
+   */
+  @Override
+  public String getValue() {
+    return value;
+  }
+
+  /**
+   * Convert an API string value to the corresponding enum constant. Returns _UNKNOWN for
+   * unrecognized values to ensure forward compatibility.
+   *
+   * @param value the API string value
+   * @return the corresponding enum constant, or _UNKNOWN if not recognized
+   */
+  public static ServiceUnavailableApiErrorCode fromString(String value) {
+    if (value == null) {
+      return _UNKNOWN;
+    }
+    for (ServiceUnavailableApiErrorCode enumValue : ServiceUnavailableApiErrorCode.values()) {
+      if (enumValue.value != null && enumValue.value.equals(value)) {
+        return enumValue;
+      }
+    }
+    return _UNKNOWN;
+  }
+
+  /**
+   * Check if this error code is a known (non-unknown) value.
+   *
+   * @return true if this is a recognized error code
+   */
+  @Override
+  public boolean isKnown() {
+    return this != _UNKNOWN;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/codes/TooManyRequestsApiErrorCode.java b/src/main/java/com/chargebee/v4/exceptions/codes/TooManyRequestsApiErrorCode.java
new file mode 100644
index 00000000..27c6bfef
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/codes/TooManyRequestsApiErrorCode.java
@@ -0,0 +1,70 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.exceptions.codes;
+
+/** API error codes for HTTP 429 responses */
+public enum TooManyRequestsApiErrorCode implements ApiErrorCode {
+
+  /** API error code: third_party_api_request_limit_exceeded */
+  THIRD_PARTY_API_REQUEST_LIMIT_EXCEEDED("third_party_api_request_limit_exceeded"),
+
+  /** API error code: api_request_limit_exceeded */
+  API_REQUEST_LIMIT_EXCEEDED("api_request_limit_exceeded"),
+
+  /** API error code: lock_timeout */
+  LOCK_TIMEOUT("lock_timeout"),
+
+  /**
+   * Represents an unknown or unrecognized error code. This allows forward compatibility when new
+   * error codes are added.
+   */
+  _UNKNOWN(null);
+
+  private final String value;
+
+  TooManyRequestsApiErrorCode(String value) {
+    this.value = value;
+  }
+
+  /**
+   * Get the string value of this error code as returned by the API.
+   *
+   * @return the API string value, or null for _UNKNOWN
+   */
+  @Override
+  public String getValue() {
+    return value;
+  }
+
+  /**
+   * Convert an API string value to the corresponding enum constant. Returns _UNKNOWN for
+   * unrecognized values to ensure forward compatibility.
+   *
+   * @param value the API string value
+   * @return the corresponding enum constant, or _UNKNOWN if not recognized
+   */
+  public static TooManyRequestsApiErrorCode fromString(String value) {
+    if (value == null) {
+      return _UNKNOWN;
+    }
+    for (TooManyRequestsApiErrorCode enumValue : TooManyRequestsApiErrorCode.values()) {
+      if (enumValue.value != null && enumValue.value.equals(value)) {
+        return enumValue;
+      }
+    }
+    return _UNKNOWN;
+  }
+
+  /**
+   * Check if this error code is a known (non-unknown) value.
+   *
+   * @return true if this is a recognized error code
+   */
+  @Override
+  public boolean isKnown() {
+    return this != _UNKNOWN;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/codes/UnauthorizedApiErrorCode.java b/src/main/java/com/chargebee/v4/exceptions/codes/UnauthorizedApiErrorCode.java
new file mode 100644
index 00000000..192e5ddc
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/codes/UnauthorizedApiErrorCode.java
@@ -0,0 +1,67 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.exceptions.codes;
+
+/** API error codes for HTTP 401 responses */
+public enum UnauthorizedApiErrorCode implements ApiErrorCode {
+
+  /** API error code: api_authentication_failed */
+  API_AUTHENTICATION_FAILED("api_authentication_failed"),
+
+  /** API error code: basic_authentication_failed */
+  BASIC_AUTHENTICATION_FAILED("basic_authentication_failed"),
+
+  /**
+   * Represents an unknown or unrecognized error code. This allows forward compatibility when new
+   * error codes are added.
+   */
+  _UNKNOWN(null);
+
+  private final String value;
+
+  UnauthorizedApiErrorCode(String value) {
+    this.value = value;
+  }
+
+  /**
+   * Get the string value of this error code as returned by the API.
+   *
+   * @return the API string value, or null for _UNKNOWN
+   */
+  @Override
+  public String getValue() {
+    return value;
+  }
+
+  /**
+   * Convert an API string value to the corresponding enum constant. Returns _UNKNOWN for
+   * unrecognized values to ensure forward compatibility.
+   *
+   * @param value the API string value
+   * @return the corresponding enum constant, or _UNKNOWN if not recognized
+   */
+  public static UnauthorizedApiErrorCode fromString(String value) {
+    if (value == null) {
+      return _UNKNOWN;
+    }
+    for (UnauthorizedApiErrorCode enumValue : UnauthorizedApiErrorCode.values()) {
+      if (enumValue.value != null && enumValue.value.equals(value)) {
+        return enumValue;
+      }
+    }
+    return _UNKNOWN;
+  }
+
+  /**
+   * Check if this error code is a known (non-unknown) value.
+   *
+   * @return true if this is a recognized error code
+   */
+  @Override
+  public boolean isKnown() {
+    return this != _UNKNOWN;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/exceptions/codes/UnprocessableEntityApiErrorCode.java b/src/main/java/com/chargebee/v4/exceptions/codes/UnprocessableEntityApiErrorCode.java
new file mode 100644
index 00000000..6ebf73e2
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/exceptions/codes/UnprocessableEntityApiErrorCode.java
@@ -0,0 +1,64 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.exceptions.codes;
+
+/** API error codes for HTTP 422 responses */
+public enum UnprocessableEntityApiErrorCode implements ApiErrorCode {
+
+  /** API error code: unable_to_process_request */
+  UNABLE_TO_PROCESS_REQUEST("unable_to_process_request"),
+
+  /**
+   * Represents an unknown or unrecognized error code. This allows forward compatibility when new
+   * error codes are added.
+   */
+  _UNKNOWN(null);
+
+  private final String value;
+
+  UnprocessableEntityApiErrorCode(String value) {
+    this.value = value;
+  }
+
+  /**
+   * Get the string value of this error code as returned by the API.
+   *
+   * @return the API string value, or null for _UNKNOWN
+   */
+  @Override
+  public String getValue() {
+    return value;
+  }
+
+  /**
+   * Convert an API string value to the corresponding enum constant. Returns _UNKNOWN for
+   * unrecognized values to ensure forward compatibility.
+   *
+   * @param value the API string value
+   * @return the corresponding enum constant, or _UNKNOWN if not recognized
+   */
+  public static UnprocessableEntityApiErrorCode fromString(String value) {
+    if (value == null) {
+      return _UNKNOWN;
+    }
+    for (UnprocessableEntityApiErrorCode enumValue : UnprocessableEntityApiErrorCode.values()) {
+      if (enumValue.value != null && enumValue.value.equals(value)) {
+        return enumValue;
+      }
+    }
+    return _UNKNOWN;
+  }
+
+  /**
+   * Check if this error code is a known (non-unknown) value.
+   *
+   * @return true if this is a recognized error code
+   */
+  @Override
+  public boolean isKnown() {
+    return this != _UNKNOWN;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/internal/JsonUtil.java b/src/main/java/com/chargebee/v4/internal/JsonUtil.java
index f8b46a98..d1e54b7c 100644
--- a/src/main/java/com/chargebee/v4/internal/JsonUtil.java
+++ b/src/main/java/com/chargebee/v4/internal/JsonUtil.java
@@ -120,26 +120,114 @@ public static String getObject(String json, String key) {
         if (json == null || key == null) {
             return null;
         }
-        Pattern pattern = Pattern.compile("\"" + Pattern.quote(key) + "\"\\s*:\\s*(\\{[^}]*\\})");
+        // Find the key position
+        String keyPattern = "\"" + Pattern.quote(key) + "\"\\s*:";
+        Pattern pattern = Pattern.compile(keyPattern);
         Matcher matcher = pattern.matcher(json);
-        if (matcher.find()) {
-            return matcher.group(1);
+        if (!matcher.find()) {
+            return null;
+        }
+        
+        // Find the start of the object value (skip whitespace after colon)
+        int start = matcher.end();
+        while (start < json.length() && Character.isWhitespace(json.charAt(start))) {
+            start++;
+        }
+        
+        if (start >= json.length() || json.charAt(start) != '{') {
+            return null;
+        }
+        
+        // Extract the object by tracking brace depth
+        int depth = 0;
+        boolean inString = false;
+        boolean escaped = false;
+        int objectStart = start;
+        
+        for (int i = start; i < json.length(); i++) {
+            char c = json.charAt(i);
+            
+            if (escaped) {
+                escaped = false;
+                continue;
+            }
+            
+            if (c == '\\' && inString) {
+                escaped = true;
+                continue;
+            }
+            
+            if (c == '"' && !escaped) {
+                inString = !inString;
+                continue;
+            }
+            
+            if (!inString) {
+                if (c == '{') {
+                    depth++;
+                } else if (c == '}') {
+                    depth--;
+                    if (depth == 0) {
+                        return json.substring(objectStart, i + 1);
+                    }
+                }
+            }
         }
+        
         return null;
     }
     
     /**
      * Extract array as JSON string for a given key.
+     * Handles nested arrays and objects by tracking bracket depth.
      */
     public static String getArray(String json, String key) {
         if (json == null || key == null) {
             return null;
         }
-        String pattern = "\"" + Pattern.quote(key) + "\"\\s*:\\s*(\\[.*?\\])";
-        Pattern p = Pattern.compile(pattern, Pattern.DOTALL);
+        
+        // Find the key position
+        String keyPattern = "\"" + Pattern.quote(key) + "\"\\s*:\\s*\\[";
+        Pattern p = Pattern.compile(keyPattern);
         Matcher matcher = p.matcher(json);
-        if (matcher.find()) {
-            return matcher.group(1);
+        if (!matcher.find()) {
+            return null;
+        }
+        
+        // Start from the opening bracket
+        int start = matcher.end() - 1; // Position of '['
+        int depth = 0;
+        boolean inString = false;
+        boolean escaped = false;
+        
+        for (int i = start; i < json.length(); i++) {
+            char c = json.charAt(i);
+            
+            if (escaped) {
+                escaped = false;
+                continue;
+            }
+            
+            if (c == '\\' && inString) {
+                escaped = true;
+                continue;
+            }
+            
+            if (c == '"' && !escaped) {
+                inString = !inString;
+                continue;
+            }
+            
+            if (!inString) {
+                if (c == '[') {
+                    depth++;
+                } else if (c == ']') {
+                    depth--;
+                    if (depth == 0) {
+                        return json.substring(start, i + 1);
+                    }
+                }
+            }
         }
         return null;
     }
@@ -200,8 +288,17 @@ public static List<String> parseObjectArray(String arrayJson) {
      * Check if a key exists and has non-null value.
      */
     public static boolean hasValue(String json, String key) {
-        Pattern pattern = Pattern.compile("\"" + Pattern.quote(key) + "\"\\s*:\\s*(?!null\\b)");
-        return pattern.matcher(json).find();
+        if (json == null || key == null) {
+            return false;
+        }
+        // First check if the key exists with null value
+        Pattern nullPattern = Pattern.compile("\"" + Pattern.quote(key) + "\"\\s*:\\s*null\\b");
+        if (nullPattern.matcher(json).find()) {
+            return false;
+        }
+        // Then check if the key exists at all
+        Pattern keyPattern = Pattern.compile("\"" + Pattern.quote(key) + "\"\\s*:");
+        return keyPattern.matcher(json).find();
     }
     
     /**
@@ -329,15 +426,11 @@ public static List<java.math.BigDecimal> parseArrayOfBigDecimal(String arrayJson
     }
 
     /** 
-     * Parse timestamp from JSON string.
+     * Parse timestamp from JSON (Unix epoch seconds).
      */
     public static Timestamp getTimestamp(String json, String key) {
-        Pattern pattern = Pattern.compile("\"" + Pattern.quote(key) + "\"\\s*:\\s*(\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d{3}Z)");
-        Matcher matcher = pattern.matcher(json);
-        if (matcher.find()) {
-            return Timestamp.valueOf(matcher.group(1));
-        }
-        return null;
+        Long epochSeconds = getLong(json, key);
+        return epochSeconds != null ? new Timestamp(epochSeconds * 1000) : null;
     }
 
     /**
@@ -539,18 +632,26 @@ else if (c == ']') {
 
     /**
      * Unescape JSON string.
+     * Processes escape sequences correctly by handling \\\\ last to avoid
+     * incorrectly interpreting sequences like \\t as tab.
      */
     private static String unescapeJsonString(String escaped) {
         if (escaped == null) return null;
+        
+        // Use a placeholder for \\ to avoid interference with other escapes
+        // e.g., \\t should become \t (backslash + t), not a tab character
+        String placeholder = "\u0000BACKSLASH\u0000";
+        
         return escaped
+            .replace("\\\\", placeholder)  // Temporarily replace \\ with placeholder
             .replace("\\\"", "\"")
-            .replace("\\\\", "\\")
             .replace("\\/", "/")
             .replace("\\b", "\b")
             .replace("\\f", "\f")
             .replace("\\n", "\n")
             .replace("\\r", "\r")
-            .replace("\\t", "\t");
+            .replace("\\t", "\t")
+            .replace(placeholder, "\\");   // Replace placeholder with actual backslash
     }
 
     /**
diff --git a/src/main/java/com/chargebee/v4/core/responses/BaseResponse.java b/src/main/java/com/chargebee/v4/models/BaseResponse.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/responses/BaseResponse.java
rename to src/main/java/com/chargebee/v4/models/BaseResponse.java
index b99d74b3..9d70190e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/BaseResponse.java
+++ b/src/main/java/com/chargebee/v4/models/BaseResponse.java
@@ -1,4 +1,4 @@
-package com.chargebee.v4.core.responses;
+package com.chargebee.v4.models;
 
 import com.chargebee.v4.transport.Response;
 import java.util.List;
@@ -6,8 +6,8 @@
 import java.util.Collections;
 
 /**
- * Base class for all response objects.
- * Provides common functionality for accessing HTTP response metadata.
+ * Base class for all response objects. Provides common functionality for accessing HTTP response
+ * metadata.
  */
 public abstract class BaseResponse {
   private final Response httpResponse;
@@ -16,30 +16,22 @@ protected BaseResponse(Response httpResponse) {
     this.httpResponse = httpResponse;
   }
 
-  /**
-   * Get the raw response payload as JSON string.
-   */
+  /** Get the raw response payload as JSON string. */
   public String responsePayload() {
     return httpResponse != null ? httpResponse.getBodyAsString() : null;
   }
 
-  /**
-   * Get the HTTP status code.
-   */
+  /** Get the HTTP status code. */
   public int httpStatus() {
     return httpResponse != null ? httpResponse.getStatusCode() : 0;
   }
 
-  /**
-   * Get response headers.
-   */
+  /** Get response headers. */
   public Map<String, List<String>> headers() {
     return httpResponse != null ? httpResponse.getHeaders() : Collections.emptyMap();
   }
 
-  /**
-   * Get a specific header value.
-   */
+  /** Get a specific header value. */
   public List<String> header(String name) {
     if (httpResponse == null) return null;
     return httpResponse.getHeaders().entrySet().stream()
@@ -50,8 +42,8 @@ public List<String> header(String name) {
   }
 
   /**
-   * Check if this response is an idempotency replay.
-   * Returns true if the chargebee-idempotency-replayed header is set to "true".
+   * Check if this response is an idempotency replay. Returns true if the
+   * chargebee-idempotency-replayed header is set to "true".
    *
    * @return true if this is a replayed idempotent request, false otherwise
    */
diff --git a/src/main/java/com/chargebee/v4/core/models/additionalBillingLogiq/params/AdditionalBillingLogiqRetrieveParams.java b/src/main/java/com/chargebee/v4/models/additionalBillingLogiq/params/AdditionalBillingLogiqRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/additionalBillingLogiq/params/AdditionalBillingLogiqRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/additionalBillingLogiq/params/AdditionalBillingLogiqRetrieveParams.java
index 27280cda..5c268182 100644
--- a/src/main/java/com/chargebee/v4/core/models/additionalBillingLogiq/params/AdditionalBillingLogiqRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/additionalBillingLogiq/params/AdditionalBillingLogiqRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.additionalBillingLogiq.params;
+package com.chargebee.v4.models.additionalBillingLogiq.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/additionalBillingLogiq/responses/AdditionalBillingLogiqRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/additionalBillingLogiq/responses/AdditionalBillingLogiqRetrieveResponse.java
new file mode 100644
index 00000000..960b1ffa
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/additionalBillingLogiq/responses/AdditionalBillingLogiqRetrieveResponse.java
@@ -0,0 +1,74 @@
+package com.chargebee.v4.models.additionalBillingLogiq.responses;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for AdditionalBillingLogiqRetrieve operation. Contains the response
+ * data from a single resource get operation.
+ */
+public final class AdditionalBillingLogiqRetrieveResponse extends BaseResponse {
+  private final Object additionalBillingLogiq;
+
+  private AdditionalBillingLogiqRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.additionalBillingLogiq = builder.additionalBillingLogiq;
+  }
+
+  /** Parse JSON response into AdditionalBillingLogiqRetrieveResponse object. */
+  public static AdditionalBillingLogiqRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into AdditionalBillingLogiqRetrieveResponse object with HTTP response. */
+  public static AdditionalBillingLogiqRetrieveResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.additionalBillingLogiq(JsonUtil.getObject(json, "additional_billing_logiq"));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse AdditionalBillingLogiqRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for AdditionalBillingLogiqRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for AdditionalBillingLogiqRetrieveResponse. */
+  public static class Builder {
+
+    private Object additionalBillingLogiq;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder additionalBillingLogiq(Object additionalBillingLogiq) {
+      this.additionalBillingLogiq = additionalBillingLogiq;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public AdditionalBillingLogiqRetrieveResponse build() {
+      return new AdditionalBillingLogiqRetrieveResponse(this);
+    }
+  }
+
+  /** Get the additionalBillingLogiq from the response. */
+  public Object getAdditionalBillingLogiq() {
+    return additionalBillingLogiq;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/addon/Addon.java b/src/main/java/com/chargebee/v4/models/addon/Addon.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/addon/Addon.java
rename to src/main/java/com/chargebee/v4/models/addon/Addon.java
index 83340cb2..e60f7f04 100644
--- a/src/main/java/com/chargebee/v4/core/models/addon/Addon.java
+++ b/src/main/java/com/chargebee/v4/models/addon/Addon.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.addon;
+package com.chargebee.v4.models.addon;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -58,7 +58,7 @@ public class Addon {
   private List<Tiers> tiers;
   private List<TaxProvidersFields> taxProvidersFields;
 
-  private java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+  private java.util.Map<String, String> customFields = new java.util.HashMap<>();
 
   public String getId() {
     return id;
@@ -243,7 +243,7 @@ public List<TaxProvidersFields> getTaxProvidersFields() {
    *
    * @return map containing all custom fields
    */
-  public java.util.Map<String, Object> getCustomFields() {
+  public java.util.Map<String, String> getCustomFields() {
     return customFields;
   }
 
@@ -253,7 +253,7 @@ public java.util.Map<String, Object> getCustomFields() {
    * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
    * @return the value of the custom field, or null if not present
    */
-  public Object getCustomField(String fieldName) {
+  public String getCustomField(String fieldName) {
     return customFields.get(fieldName);
   }
 
@@ -547,7 +547,7 @@ public static ProrationType fromString(String value) {
   public static Addon fromJson(String json) {
     Addon obj = new Addon();
 
-    // Parse JSON to extract all keys
+    // Parse JSON to extract all keys for custom field extraction
     java.util.Set<String> knownFields = new java.util.HashSet<>();
 
     knownFields.add("id");
@@ -752,9 +752,9 @@ public static Addon fromJson(String json) {
    * @param knownFields set of known field names
    * @return map of custom fields
    */
-  private static java.util.Map<String, Object> extractCustomFields(
+  private static java.util.Map<String, String> extractCustomFields(
       String json, java.util.Set<String> knownFields) {
-    java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+    java.util.Map<String, String> customFields = new java.util.HashMap<>();
     try {
       // Parse the entire JSON as a map
       java.util.Map<String, Object> allFields = JsonUtil.parseJsonObjectToMap(json);
@@ -763,7 +763,8 @@ private static java.util.Map<String, Object> extractCustomFields(
           String key = entry.getKey();
           // Include fields that start with "cf_" and are not in knownFields
           if (key != null && key.startsWith("cf_") && !knownFields.contains(key)) {
-            customFields.put(key, entry.getValue());
+            customFields.put(
+                key, entry.getValue() != null ? String.valueOf(entry.getValue()) : null);
           }
         }
       }
diff --git a/src/main/java/com/chargebee/v4/models/addon/params/AddonCopyParams.java b/src/main/java/com/chargebee/v4/models/addon/params/AddonCopyParams.java
new file mode 100644
index 00000000..f3b1c9a5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/addon/params/AddonCopyParams.java
@@ -0,0 +1,120 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.addon.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class AddonCopyParams {
+
+  private final String fromSite;
+
+  private final String idAtFromSite;
+
+  private final String id;
+
+  private final Boolean forSiteMerging;
+
+  private AddonCopyParams(AddonCopyBuilder builder) {
+
+    this.fromSite = builder.fromSite;
+
+    this.idAtFromSite = builder.idAtFromSite;
+
+    this.id = builder.id;
+
+    this.forSiteMerging = builder.forSiteMerging;
+  }
+
+  public String getFromSite() {
+    return fromSite;
+  }
+
+  public String getIdAtFromSite() {
+    return idAtFromSite;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public Boolean getForSiteMerging() {
+    return forSiteMerging;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.fromSite != null) {
+
+      formData.put("from_site", this.fromSite);
+    }
+
+    if (this.idAtFromSite != null) {
+
+      formData.put("id_at_from_site", this.idAtFromSite);
+    }
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.forSiteMerging != null) {
+
+      formData.put("for_site_merging", this.forSiteMerging);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for AddonCopyParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static AddonCopyBuilder builder() {
+    return new AddonCopyBuilder();
+  }
+
+  public static final class AddonCopyBuilder {
+
+    private String fromSite;
+
+    private String idAtFromSite;
+
+    private String id;
+
+    private Boolean forSiteMerging;
+
+    private AddonCopyBuilder() {}
+
+    public AddonCopyBuilder fromSite(String value) {
+      this.fromSite = value;
+      return this;
+    }
+
+    public AddonCopyBuilder idAtFromSite(String value) {
+      this.idAtFromSite = value;
+      return this;
+    }
+
+    public AddonCopyBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public AddonCopyBuilder forSiteMerging(Boolean value) {
+      this.forSiteMerging = value;
+      return this;
+    }
+
+    public AddonCopyParams build() {
+      return new AddonCopyParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/addon/params/AddonCreateParams.java b/src/main/java/com/chargebee/v4/models/addon/params/AddonCreateParams.java
new file mode 100644
index 00000000..7846400b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/addon/params/AddonCreateParams.java
@@ -0,0 +1,1406 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.addon.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class AddonCreateParams {
+
+  private final String id;
+
+  private final String name;
+
+  private final String invoiceName;
+
+  private final String description;
+
+  private final ChargeType chargeType;
+
+  private final Long price;
+
+  private final String currencyCode;
+
+  private final Integer period;
+
+  private final PeriodUnit periodUnit;
+
+  private final PricingModel pricingModel;
+
+  private final Type type;
+
+  private final String unit;
+
+  private final Boolean enabledInPortal;
+
+  private final Boolean taxable;
+
+  private final String taxProfileId;
+
+  private final AvalaraSaleType avalaraSaleType;
+
+  private final Integer avalaraTransactionType;
+
+  private final Integer avalaraServiceType;
+
+  private final String taxCode;
+
+  private final String hsnCode;
+
+  private final String taxjarProductCode;
+
+  private final String invoiceNotes;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final String sku;
+
+  private final String accountingCode;
+
+  private final String accountingCategory1;
+
+  private final String accountingCategory2;
+
+  private final String accountingCategory3;
+
+  private final String accountingCategory4;
+
+  private final Boolean isShippable;
+
+  private final Integer shippingFrequencyPeriod;
+
+  private final ShippingFrequencyPeriodUnit shippingFrequencyPeriodUnit;
+
+  private final Boolean includedInMrr;
+
+  private final Boolean showDescriptionInInvoices;
+
+  private final Boolean showDescriptionInQuotes;
+
+  private final String priceInDecimal;
+
+  private final ProrationType prorationType;
+
+  private final Status status;
+
+  private final List<TiersParams> tiers;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private final Map<String, String> customFields;
+
+  private AddonCreateParams(AddonCreateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.name = builder.name;
+
+    this.invoiceName = builder.invoiceName;
+
+    this.description = builder.description;
+
+    this.chargeType = builder.chargeType;
+
+    this.price = builder.price;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.period = builder.period;
+
+    this.periodUnit = builder.periodUnit;
+
+    this.pricingModel = builder.pricingModel;
+
+    this.type = builder.type;
+
+    this.unit = builder.unit;
+
+    this.enabledInPortal = builder.enabledInPortal;
+
+    this.taxable = builder.taxable;
+
+    this.taxProfileId = builder.taxProfileId;
+
+    this.avalaraSaleType = builder.avalaraSaleType;
+
+    this.avalaraTransactionType = builder.avalaraTransactionType;
+
+    this.avalaraServiceType = builder.avalaraServiceType;
+
+    this.taxCode = builder.taxCode;
+
+    this.hsnCode = builder.hsnCode;
+
+    this.taxjarProductCode = builder.taxjarProductCode;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.metaData = builder.metaData;
+
+    this.sku = builder.sku;
+
+    this.accountingCode = builder.accountingCode;
+
+    this.accountingCategory1 = builder.accountingCategory1;
+
+    this.accountingCategory2 = builder.accountingCategory2;
+
+    this.accountingCategory3 = builder.accountingCategory3;
+
+    this.accountingCategory4 = builder.accountingCategory4;
+
+    this.isShippable = builder.isShippable;
+
+    this.shippingFrequencyPeriod = builder.shippingFrequencyPeriod;
+
+    this.shippingFrequencyPeriodUnit = builder.shippingFrequencyPeriodUnit;
+
+    this.includedInMrr = builder.includedInMrr;
+
+    this.showDescriptionInInvoices = builder.showDescriptionInInvoices;
+
+    this.showDescriptionInQuotes = builder.showDescriptionInQuotes;
+
+    this.priceInDecimal = builder.priceInDecimal;
+
+    this.prorationType = builder.prorationType;
+
+    this.status = builder.status;
+
+    this.tiers = builder.tiers;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getInvoiceName() {
+    return invoiceName;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public ChargeType getChargeType() {
+    return chargeType;
+  }
+
+  public Long getPrice() {
+    return price;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public Integer getPeriod() {
+    return period;
+  }
+
+  public PeriodUnit getPeriodUnit() {
+    return periodUnit;
+  }
+
+  public PricingModel getPricingModel() {
+    return pricingModel;
+  }
+
+  public Type getType() {
+    return type;
+  }
+
+  public String getUnit() {
+    return unit;
+  }
+
+  public Boolean getEnabledInPortal() {
+    return enabledInPortal;
+  }
+
+  public Boolean getTaxable() {
+    return taxable;
+  }
+
+  public String getTaxProfileId() {
+    return taxProfileId;
+  }
+
+  public AvalaraSaleType getAvalaraSaleType() {
+    return avalaraSaleType;
+  }
+
+  public Integer getAvalaraTransactionType() {
+    return avalaraTransactionType;
+  }
+
+  public Integer getAvalaraServiceType() {
+    return avalaraServiceType;
+  }
+
+  public String getTaxCode() {
+    return taxCode;
+  }
+
+  public String getHsnCode() {
+    return hsnCode;
+  }
+
+  public String getTaxjarProductCode() {
+    return taxjarProductCode;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public String getSku() {
+    return sku;
+  }
+
+  public String getAccountingCode() {
+    return accountingCode;
+  }
+
+  public String getAccountingCategory1() {
+    return accountingCategory1;
+  }
+
+  public String getAccountingCategory2() {
+    return accountingCategory2;
+  }
+
+  public String getAccountingCategory3() {
+    return accountingCategory3;
+  }
+
+  public String getAccountingCategory4() {
+    return accountingCategory4;
+  }
+
+  public Boolean getIsShippable() {
+    return isShippable;
+  }
+
+  public Integer getShippingFrequencyPeriod() {
+    return shippingFrequencyPeriod;
+  }
+
+  public ShippingFrequencyPeriodUnit getShippingFrequencyPeriodUnit() {
+    return shippingFrequencyPeriodUnit;
+  }
+
+  public Boolean getIncludedInMrr() {
+    return includedInMrr;
+  }
+
+  public Boolean getShowDescriptionInInvoices() {
+    return showDescriptionInInvoices;
+  }
+
+  public Boolean getShowDescriptionInQuotes() {
+    return showDescriptionInQuotes;
+  }
+
+  public String getPriceInDecimal() {
+    return priceInDecimal;
+  }
+
+  public ProrationType getProrationType() {
+    return prorationType;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public List<TiersParams> getTiers() {
+    return tiers;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.invoiceName != null) {
+
+      formData.put("invoice_name", this.invoiceName);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.chargeType != null) {
+
+      formData.put("charge_type", this.chargeType);
+    }
+
+    if (this.price != null) {
+
+      formData.put("price", this.price);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.period != null) {
+
+      formData.put("period", this.period);
+    }
+
+    if (this.periodUnit != null) {
+
+      formData.put("period_unit", this.periodUnit);
+    }
+
+    if (this.pricingModel != null) {
+
+      formData.put("pricing_model", this.pricingModel);
+    }
+
+    if (this.type != null) {
+
+      formData.put("type", this.type);
+    }
+
+    if (this.unit != null) {
+
+      formData.put("unit", this.unit);
+    }
+
+    if (this.enabledInPortal != null) {
+
+      formData.put("enabled_in_portal", this.enabledInPortal);
+    }
+
+    if (this.taxable != null) {
+
+      formData.put("taxable", this.taxable);
+    }
+
+    if (this.taxProfileId != null) {
+
+      formData.put("tax_profile_id", this.taxProfileId);
+    }
+
+    if (this.avalaraSaleType != null) {
+
+      formData.put("avalara_sale_type", this.avalaraSaleType);
+    }
+
+    if (this.avalaraTransactionType != null) {
+
+      formData.put("avalara_transaction_type", this.avalaraTransactionType);
+    }
+
+    if (this.avalaraServiceType != null) {
+
+      formData.put("avalara_service_type", this.avalaraServiceType);
+    }
+
+    if (this.taxCode != null) {
+
+      formData.put("tax_code", this.taxCode);
+    }
+
+    if (this.hsnCode != null) {
+
+      formData.put("hsn_code", this.hsnCode);
+    }
+
+    if (this.taxjarProductCode != null) {
+
+      formData.put("taxjar_product_code", this.taxjarProductCode);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.sku != null) {
+
+      formData.put("sku", this.sku);
+    }
+
+    if (this.accountingCode != null) {
+
+      formData.put("accounting_code", this.accountingCode);
+    }
+
+    if (this.accountingCategory1 != null) {
+
+      formData.put("accounting_category1", this.accountingCategory1);
+    }
+
+    if (this.accountingCategory2 != null) {
+
+      formData.put("accounting_category2", this.accountingCategory2);
+    }
+
+    if (this.accountingCategory3 != null) {
+
+      formData.put("accounting_category3", this.accountingCategory3);
+    }
+
+    if (this.accountingCategory4 != null) {
+
+      formData.put("accounting_category4", this.accountingCategory4);
+    }
+
+    if (this.isShippable != null) {
+
+      formData.put("is_shippable", this.isShippable);
+    }
+
+    if (this.shippingFrequencyPeriod != null) {
+
+      formData.put("shipping_frequency_period", this.shippingFrequencyPeriod);
+    }
+
+    if (this.shippingFrequencyPeriodUnit != null) {
+
+      formData.put("shipping_frequency_period_unit", this.shippingFrequencyPeriodUnit);
+    }
+
+    if (this.includedInMrr != null) {
+
+      formData.put("included_in_mrr", this.includedInMrr);
+    }
+
+    if (this.showDescriptionInInvoices != null) {
+
+      formData.put("show_description_in_invoices", this.showDescriptionInInvoices);
+    }
+
+    if (this.showDescriptionInQuotes != null) {
+
+      formData.put("show_description_in_quotes", this.showDescriptionInQuotes);
+    }
+
+    if (this.priceInDecimal != null) {
+
+      formData.put("price_in_decimal", this.priceInDecimal);
+    }
+
+    if (this.prorationType != null) {
+
+      formData.put("proration_type", this.prorationType);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.tiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.tiers.size(); i++) {
+        TiersParams item = this.tiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for AddonCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static AddonCreateBuilder builder() {
+    return new AddonCreateBuilder();
+  }
+
+  public static final class AddonCreateBuilder {
+
+    private String id;
+
+    private String name;
+
+    private String invoiceName;
+
+    private String description;
+
+    private ChargeType chargeType;
+
+    private Long price;
+
+    private String currencyCode;
+
+    private Integer period;
+
+    private PeriodUnit periodUnit;
+
+    private PricingModel pricingModel;
+
+    private Type type;
+
+    private String unit;
+
+    private Boolean enabledInPortal;
+
+    private Boolean taxable;
+
+    private String taxProfileId;
+
+    private AvalaraSaleType avalaraSaleType;
+
+    private Integer avalaraTransactionType;
+
+    private Integer avalaraServiceType;
+
+    private String taxCode;
+
+    private String hsnCode;
+
+    private String taxjarProductCode;
+
+    private String invoiceNotes;
+
+    private java.util.Map<String, Object> metaData;
+
+    private String sku;
+
+    private String accountingCode;
+
+    private String accountingCategory1;
+
+    private String accountingCategory2;
+
+    private String accountingCategory3;
+
+    private String accountingCategory4;
+
+    private Boolean isShippable;
+
+    private Integer shippingFrequencyPeriod;
+
+    private ShippingFrequencyPeriodUnit shippingFrequencyPeriodUnit;
+
+    private Boolean includedInMrr;
+
+    private Boolean showDescriptionInInvoices;
+
+    private Boolean showDescriptionInQuotes;
+
+    private String priceInDecimal;
+
+    private ProrationType prorationType;
+
+    private Status status;
+
+    private List<TiersParams> tiers;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private AddonCreateBuilder() {}
+
+    public AddonCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public AddonCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public AddonCreateBuilder invoiceName(String value) {
+      this.invoiceName = value;
+      return this;
+    }
+
+    public AddonCreateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public AddonCreateBuilder chargeType(ChargeType value) {
+      this.chargeType = value;
+      return this;
+    }
+
+    public AddonCreateBuilder price(Long value) {
+      this.price = value;
+      return this;
+    }
+
+    public AddonCreateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public AddonCreateBuilder period(Integer value) {
+      this.period = value;
+      return this;
+    }
+
+    public AddonCreateBuilder periodUnit(PeriodUnit value) {
+      this.periodUnit = value;
+      return this;
+    }
+
+    public AddonCreateBuilder pricingModel(PricingModel value) {
+      this.pricingModel = value;
+      return this;
+    }
+
+    @Deprecated
+    public AddonCreateBuilder type(Type value) {
+      this.type = value;
+      return this;
+    }
+
+    public AddonCreateBuilder unit(String value) {
+      this.unit = value;
+      return this;
+    }
+
+    public AddonCreateBuilder enabledInPortal(Boolean value) {
+      this.enabledInPortal = value;
+      return this;
+    }
+
+    public AddonCreateBuilder taxable(Boolean value) {
+      this.taxable = value;
+      return this;
+    }
+
+    public AddonCreateBuilder taxProfileId(String value) {
+      this.taxProfileId = value;
+      return this;
+    }
+
+    public AddonCreateBuilder avalaraSaleType(AvalaraSaleType value) {
+      this.avalaraSaleType = value;
+      return this;
+    }
+
+    public AddonCreateBuilder avalaraTransactionType(Integer value) {
+      this.avalaraTransactionType = value;
+      return this;
+    }
+
+    public AddonCreateBuilder avalaraServiceType(Integer value) {
+      this.avalaraServiceType = value;
+      return this;
+    }
+
+    public AddonCreateBuilder taxCode(String value) {
+      this.taxCode = value;
+      return this;
+    }
+
+    public AddonCreateBuilder hsnCode(String value) {
+      this.hsnCode = value;
+      return this;
+    }
+
+    public AddonCreateBuilder taxjarProductCode(String value) {
+      this.taxjarProductCode = value;
+      return this;
+    }
+
+    public AddonCreateBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public AddonCreateBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public AddonCreateBuilder sku(String value) {
+      this.sku = value;
+      return this;
+    }
+
+    public AddonCreateBuilder accountingCode(String value) {
+      this.accountingCode = value;
+      return this;
+    }
+
+    public AddonCreateBuilder accountingCategory1(String value) {
+      this.accountingCategory1 = value;
+      return this;
+    }
+
+    public AddonCreateBuilder accountingCategory2(String value) {
+      this.accountingCategory2 = value;
+      return this;
+    }
+
+    public AddonCreateBuilder accountingCategory3(String value) {
+      this.accountingCategory3 = value;
+      return this;
+    }
+
+    public AddonCreateBuilder accountingCategory4(String value) {
+      this.accountingCategory4 = value;
+      return this;
+    }
+
+    public AddonCreateBuilder isShippable(Boolean value) {
+      this.isShippable = value;
+      return this;
+    }
+
+    public AddonCreateBuilder shippingFrequencyPeriod(Integer value) {
+      this.shippingFrequencyPeriod = value;
+      return this;
+    }
+
+    public AddonCreateBuilder shippingFrequencyPeriodUnit(ShippingFrequencyPeriodUnit value) {
+      this.shippingFrequencyPeriodUnit = value;
+      return this;
+    }
+
+    public AddonCreateBuilder includedInMrr(Boolean value) {
+      this.includedInMrr = value;
+      return this;
+    }
+
+    public AddonCreateBuilder showDescriptionInInvoices(Boolean value) {
+      this.showDescriptionInInvoices = value;
+      return this;
+    }
+
+    public AddonCreateBuilder showDescriptionInQuotes(Boolean value) {
+      this.showDescriptionInQuotes = value;
+      return this;
+    }
+
+    public AddonCreateBuilder priceInDecimal(String value) {
+      this.priceInDecimal = value;
+      return this;
+    }
+
+    public AddonCreateBuilder prorationType(ProrationType value) {
+      this.prorationType = value;
+      return this;
+    }
+
+    public AddonCreateBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public AddonCreateBuilder tiers(List<TiersParams> value) {
+      this.tiers = value;
+      return this;
+    }
+
+    public AddonCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public AddonCreateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public AddonCreateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public AddonCreateParams build() {
+      return new AddonCreateParams(this);
+    }
+  }
+
+  public enum ChargeType {
+    RECURRING("recurring"),
+
+    NON_RECURRING("non_recurring"),
+
+    /** An enum member indicating that ChargeType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChargeType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChargeType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChargeType enumValue : ChargeType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    NOT_APPLICABLE("not_applicable"),
+
+    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PeriodUnit enumValue : PeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PricingModel {
+    FLAT_FEE("flat_fee"),
+
+    PER_UNIT("per_unit"),
+
+    TIERED("tiered"),
+
+    VOLUME("volume"),
+
+    STAIRSTEP("stairstep"),
+
+    /** An enum member indicating that PricingModel was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PricingModel(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PricingModel fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PricingModel enumValue : PricingModel.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Type {
+    ON_OFF("on_off"),
+
+    QUANTITY("quantity"),
+
+    TIERED("tiered"),
+
+    VOLUME("volume"),
+
+    STAIRSTEP("stairstep"),
+
+    /** An enum member indicating that Type was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Type(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Type fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Type enumValue : Type.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AvalaraSaleType {
+    WHOLESALE("wholesale"),
+
+    RETAIL("retail"),
+
+    CONSUMED("consumed"),
+
+    VENDOR_USE("vendor_use"),
+
+    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AvalaraSaleType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AvalaraSaleType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ShippingFrequencyPeriodUnit {
+    YEAR("year"),
+
+    MONTH("month"),
+
+    WEEK("week"),
+
+    DAY("day"),
+
+    /**
+     * An enum member indicating that ShippingFrequencyPeriodUnit was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    ShippingFrequencyPeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ShippingFrequencyPeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ShippingFrequencyPeriodUnit enumValue : ShippingFrequencyPeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ProrationType {
+    SITE_DEFAULT("site_default"),
+
+    PARTIAL_TERM("partial_term"),
+
+    FULL_TERM("full_term"),
+
+    /** An enum member indicating that ProrationType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ProrationType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ProrationType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ProrationType enumValue : ProrationType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Status {
+    ACTIVE("active"),
+
+    ARCHIVED("archived"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class TiersParams {
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private TiersParams(TiersBuilder builder) {
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TiersBuilder builder() {
+      return new TiersBuilder();
+    }
+
+    public static final class TiersBuilder {
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private TiersBuilder() {}
+
+      public TiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public TiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public TiersParams build() {
+        return new TiersParams(this);
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/addon/params/AddonDeleteParams.java b/src/main/java/com/chargebee/v4/models/addon/params/AddonDeleteParams.java
new file mode 100644
index 00000000..f22b1f5b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/addon/params/AddonDeleteParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.addon.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class AddonDeleteParams {
+
+  private AddonDeleteParams(AddonDeleteBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for AddonDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static AddonDeleteBuilder builder() {
+    return new AddonDeleteBuilder();
+  }
+
+  public static final class AddonDeleteBuilder {
+
+    private AddonDeleteBuilder() {}
+
+    public AddonDeleteParams build() {
+      return new AddonDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonListParams.java b/src/main/java/com/chargebee/v4/models/addon/params/AddonListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/addon/params/AddonListParams.java
rename to src/main/java/com/chargebee/v4/models/addon/params/AddonListParams.java
index 28696ad7..069af1d0 100644
--- a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonListParams.java
+++ b/src/main/java/com/chargebee/v4/models/addon/params/AddonListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.addon.params;
+package com.chargebee.v4.models.addon.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonRetrieveParams.java b/src/main/java/com/chargebee/v4/models/addon/params/AddonRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/addon/params/AddonRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/addon/params/AddonRetrieveParams.java
index e9cdc07f..d5d502c4 100644
--- a/src/main/java/com/chargebee/v4/core/models/addon/params/AddonRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/addon/params/AddonRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.addon.params;
+package com.chargebee.v4.models.addon.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/addon/params/AddonUnarchiveParams.java b/src/main/java/com/chargebee/v4/models/addon/params/AddonUnarchiveParams.java
new file mode 100644
index 00000000..a402d94b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/addon/params/AddonUnarchiveParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.addon.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class AddonUnarchiveParams {
+
+  private AddonUnarchiveParams(AddonUnarchiveBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for AddonUnarchiveParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static AddonUnarchiveBuilder builder() {
+    return new AddonUnarchiveBuilder();
+  }
+
+  public static final class AddonUnarchiveBuilder {
+
+    private AddonUnarchiveBuilder() {}
+
+    public AddonUnarchiveParams build() {
+      return new AddonUnarchiveParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/addon/params/AddonUpdateParams.java b/src/main/java/com/chargebee/v4/models/addon/params/AddonUpdateParams.java
new file mode 100644
index 00000000..79e443dc
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/addon/params/AddonUpdateParams.java
@@ -0,0 +1,1338 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.addon.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class AddonUpdateParams {
+
+  private final String name;
+
+  private final String invoiceName;
+
+  private final String description;
+
+  private final ChargeType chargeType;
+
+  private final Long price;
+
+  private final String currencyCode;
+
+  private final Integer period;
+
+  private final PeriodUnit periodUnit;
+
+  private final PricingModel pricingModel;
+
+  private final Type type;
+
+  private final String unit;
+
+  private final Boolean enabledInPortal;
+
+  private final Boolean taxable;
+
+  private final String taxProfileId;
+
+  private final AvalaraSaleType avalaraSaleType;
+
+  private final Integer avalaraTransactionType;
+
+  private final Integer avalaraServiceType;
+
+  private final String taxCode;
+
+  private final String hsnCode;
+
+  private final String taxjarProductCode;
+
+  private final String invoiceNotes;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final String sku;
+
+  private final String accountingCode;
+
+  private final String accountingCategory1;
+
+  private final String accountingCategory2;
+
+  private final String accountingCategory3;
+
+  private final String accountingCategory4;
+
+  private final Boolean isShippable;
+
+  private final Integer shippingFrequencyPeriod;
+
+  private final ShippingFrequencyPeriodUnit shippingFrequencyPeriodUnit;
+
+  private final Boolean includedInMrr;
+
+  private final Boolean showDescriptionInInvoices;
+
+  private final Boolean showDescriptionInQuotes;
+
+  private final String priceInDecimal;
+
+  private final ProrationType prorationType;
+
+  private final List<TiersParams> tiers;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private final Map<String, String> customFields;
+
+  private AddonUpdateParams(AddonUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.invoiceName = builder.invoiceName;
+
+    this.description = builder.description;
+
+    this.chargeType = builder.chargeType;
+
+    this.price = builder.price;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.period = builder.period;
+
+    this.periodUnit = builder.periodUnit;
+
+    this.pricingModel = builder.pricingModel;
+
+    this.type = builder.type;
+
+    this.unit = builder.unit;
+
+    this.enabledInPortal = builder.enabledInPortal;
+
+    this.taxable = builder.taxable;
+
+    this.taxProfileId = builder.taxProfileId;
+
+    this.avalaraSaleType = builder.avalaraSaleType;
+
+    this.avalaraTransactionType = builder.avalaraTransactionType;
+
+    this.avalaraServiceType = builder.avalaraServiceType;
+
+    this.taxCode = builder.taxCode;
+
+    this.hsnCode = builder.hsnCode;
+
+    this.taxjarProductCode = builder.taxjarProductCode;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.metaData = builder.metaData;
+
+    this.sku = builder.sku;
+
+    this.accountingCode = builder.accountingCode;
+
+    this.accountingCategory1 = builder.accountingCategory1;
+
+    this.accountingCategory2 = builder.accountingCategory2;
+
+    this.accountingCategory3 = builder.accountingCategory3;
+
+    this.accountingCategory4 = builder.accountingCategory4;
+
+    this.isShippable = builder.isShippable;
+
+    this.shippingFrequencyPeriod = builder.shippingFrequencyPeriod;
+
+    this.shippingFrequencyPeriodUnit = builder.shippingFrequencyPeriodUnit;
+
+    this.includedInMrr = builder.includedInMrr;
+
+    this.showDescriptionInInvoices = builder.showDescriptionInInvoices;
+
+    this.showDescriptionInQuotes = builder.showDescriptionInQuotes;
+
+    this.priceInDecimal = builder.priceInDecimal;
+
+    this.prorationType = builder.prorationType;
+
+    this.tiers = builder.tiers;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getInvoiceName() {
+    return invoiceName;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public ChargeType getChargeType() {
+    return chargeType;
+  }
+
+  public Long getPrice() {
+    return price;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public Integer getPeriod() {
+    return period;
+  }
+
+  public PeriodUnit getPeriodUnit() {
+    return periodUnit;
+  }
+
+  public PricingModel getPricingModel() {
+    return pricingModel;
+  }
+
+  public Type getType() {
+    return type;
+  }
+
+  public String getUnit() {
+    return unit;
+  }
+
+  public Boolean getEnabledInPortal() {
+    return enabledInPortal;
+  }
+
+  public Boolean getTaxable() {
+    return taxable;
+  }
+
+  public String getTaxProfileId() {
+    return taxProfileId;
+  }
+
+  public AvalaraSaleType getAvalaraSaleType() {
+    return avalaraSaleType;
+  }
+
+  public Integer getAvalaraTransactionType() {
+    return avalaraTransactionType;
+  }
+
+  public Integer getAvalaraServiceType() {
+    return avalaraServiceType;
+  }
+
+  public String getTaxCode() {
+    return taxCode;
+  }
+
+  public String getHsnCode() {
+    return hsnCode;
+  }
+
+  public String getTaxjarProductCode() {
+    return taxjarProductCode;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public String getSku() {
+    return sku;
+  }
+
+  public String getAccountingCode() {
+    return accountingCode;
+  }
+
+  public String getAccountingCategory1() {
+    return accountingCategory1;
+  }
+
+  public String getAccountingCategory2() {
+    return accountingCategory2;
+  }
+
+  public String getAccountingCategory3() {
+    return accountingCategory3;
+  }
+
+  public String getAccountingCategory4() {
+    return accountingCategory4;
+  }
+
+  public Boolean getIsShippable() {
+    return isShippable;
+  }
+
+  public Integer getShippingFrequencyPeriod() {
+    return shippingFrequencyPeriod;
+  }
+
+  public ShippingFrequencyPeriodUnit getShippingFrequencyPeriodUnit() {
+    return shippingFrequencyPeriodUnit;
+  }
+
+  public Boolean getIncludedInMrr() {
+    return includedInMrr;
+  }
+
+  public Boolean getShowDescriptionInInvoices() {
+    return showDescriptionInInvoices;
+  }
+
+  public Boolean getShowDescriptionInQuotes() {
+    return showDescriptionInQuotes;
+  }
+
+  public String getPriceInDecimal() {
+    return priceInDecimal;
+  }
+
+  public ProrationType getProrationType() {
+    return prorationType;
+  }
+
+  public List<TiersParams> getTiers() {
+    return tiers;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.invoiceName != null) {
+
+      formData.put("invoice_name", this.invoiceName);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.chargeType != null) {
+
+      formData.put("charge_type", this.chargeType);
+    }
+
+    if (this.price != null) {
+
+      formData.put("price", this.price);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.period != null) {
+
+      formData.put("period", this.period);
+    }
+
+    if (this.periodUnit != null) {
+
+      formData.put("period_unit", this.periodUnit);
+    }
+
+    if (this.pricingModel != null) {
+
+      formData.put("pricing_model", this.pricingModel);
+    }
+
+    if (this.type != null) {
+
+      formData.put("type", this.type);
+    }
+
+    if (this.unit != null) {
+
+      formData.put("unit", this.unit);
+    }
+
+    if (this.enabledInPortal != null) {
+
+      formData.put("enabled_in_portal", this.enabledInPortal);
+    }
+
+    if (this.taxable != null) {
+
+      formData.put("taxable", this.taxable);
+    }
+
+    if (this.taxProfileId != null) {
+
+      formData.put("tax_profile_id", this.taxProfileId);
+    }
+
+    if (this.avalaraSaleType != null) {
+
+      formData.put("avalara_sale_type", this.avalaraSaleType);
+    }
+
+    if (this.avalaraTransactionType != null) {
+
+      formData.put("avalara_transaction_type", this.avalaraTransactionType);
+    }
+
+    if (this.avalaraServiceType != null) {
+
+      formData.put("avalara_service_type", this.avalaraServiceType);
+    }
+
+    if (this.taxCode != null) {
+
+      formData.put("tax_code", this.taxCode);
+    }
+
+    if (this.hsnCode != null) {
+
+      formData.put("hsn_code", this.hsnCode);
+    }
+
+    if (this.taxjarProductCode != null) {
+
+      formData.put("taxjar_product_code", this.taxjarProductCode);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.sku != null) {
+
+      formData.put("sku", this.sku);
+    }
+
+    if (this.accountingCode != null) {
+
+      formData.put("accounting_code", this.accountingCode);
+    }
+
+    if (this.accountingCategory1 != null) {
+
+      formData.put("accounting_category1", this.accountingCategory1);
+    }
+
+    if (this.accountingCategory2 != null) {
+
+      formData.put("accounting_category2", this.accountingCategory2);
+    }
+
+    if (this.accountingCategory3 != null) {
+
+      formData.put("accounting_category3", this.accountingCategory3);
+    }
+
+    if (this.accountingCategory4 != null) {
+
+      formData.put("accounting_category4", this.accountingCategory4);
+    }
+
+    if (this.isShippable != null) {
+
+      formData.put("is_shippable", this.isShippable);
+    }
+
+    if (this.shippingFrequencyPeriod != null) {
+
+      formData.put("shipping_frequency_period", this.shippingFrequencyPeriod);
+    }
+
+    if (this.shippingFrequencyPeriodUnit != null) {
+
+      formData.put("shipping_frequency_period_unit", this.shippingFrequencyPeriodUnit);
+    }
+
+    if (this.includedInMrr != null) {
+
+      formData.put("included_in_mrr", this.includedInMrr);
+    }
+
+    if (this.showDescriptionInInvoices != null) {
+
+      formData.put("show_description_in_invoices", this.showDescriptionInInvoices);
+    }
+
+    if (this.showDescriptionInQuotes != null) {
+
+      formData.put("show_description_in_quotes", this.showDescriptionInQuotes);
+    }
+
+    if (this.priceInDecimal != null) {
+
+      formData.put("price_in_decimal", this.priceInDecimal);
+    }
+
+    if (this.prorationType != null) {
+
+      formData.put("proration_type", this.prorationType);
+    }
+
+    if (this.tiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.tiers.size(); i++) {
+        TiersParams item = this.tiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for AddonUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static AddonUpdateBuilder builder() {
+    return new AddonUpdateBuilder();
+  }
+
+  public static final class AddonUpdateBuilder {
+
+    private String name;
+
+    private String invoiceName;
+
+    private String description;
+
+    private ChargeType chargeType;
+
+    private Long price;
+
+    private String currencyCode;
+
+    private Integer period;
+
+    private PeriodUnit periodUnit;
+
+    private PricingModel pricingModel;
+
+    private Type type;
+
+    private String unit;
+
+    private Boolean enabledInPortal;
+
+    private Boolean taxable;
+
+    private String taxProfileId;
+
+    private AvalaraSaleType avalaraSaleType;
+
+    private Integer avalaraTransactionType;
+
+    private Integer avalaraServiceType;
+
+    private String taxCode;
+
+    private String hsnCode;
+
+    private String taxjarProductCode;
+
+    private String invoiceNotes;
+
+    private java.util.Map<String, Object> metaData;
+
+    private String sku;
+
+    private String accountingCode;
+
+    private String accountingCategory1;
+
+    private String accountingCategory2;
+
+    private String accountingCategory3;
+
+    private String accountingCategory4;
+
+    private Boolean isShippable;
+
+    private Integer shippingFrequencyPeriod;
+
+    private ShippingFrequencyPeriodUnit shippingFrequencyPeriodUnit;
+
+    private Boolean includedInMrr;
+
+    private Boolean showDescriptionInInvoices;
+
+    private Boolean showDescriptionInQuotes;
+
+    private String priceInDecimal;
+
+    private ProrationType prorationType;
+
+    private List<TiersParams> tiers;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private AddonUpdateBuilder() {}
+
+    public AddonUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder invoiceName(String value) {
+      this.invoiceName = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder chargeType(ChargeType value) {
+      this.chargeType = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder price(Long value) {
+      this.price = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder period(Integer value) {
+      this.period = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder periodUnit(PeriodUnit value) {
+      this.periodUnit = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder pricingModel(PricingModel value) {
+      this.pricingModel = value;
+      return this;
+    }
+
+    @Deprecated
+    public AddonUpdateBuilder type(Type value) {
+      this.type = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder unit(String value) {
+      this.unit = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder enabledInPortal(Boolean value) {
+      this.enabledInPortal = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder taxable(Boolean value) {
+      this.taxable = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder taxProfileId(String value) {
+      this.taxProfileId = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder avalaraSaleType(AvalaraSaleType value) {
+      this.avalaraSaleType = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder avalaraTransactionType(Integer value) {
+      this.avalaraTransactionType = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder avalaraServiceType(Integer value) {
+      this.avalaraServiceType = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder taxCode(String value) {
+      this.taxCode = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder hsnCode(String value) {
+      this.hsnCode = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder taxjarProductCode(String value) {
+      this.taxjarProductCode = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder sku(String value) {
+      this.sku = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder accountingCode(String value) {
+      this.accountingCode = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder accountingCategory1(String value) {
+      this.accountingCategory1 = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder accountingCategory2(String value) {
+      this.accountingCategory2 = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder accountingCategory3(String value) {
+      this.accountingCategory3 = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder accountingCategory4(String value) {
+      this.accountingCategory4 = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder isShippable(Boolean value) {
+      this.isShippable = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder shippingFrequencyPeriod(Integer value) {
+      this.shippingFrequencyPeriod = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder shippingFrequencyPeriodUnit(ShippingFrequencyPeriodUnit value) {
+      this.shippingFrequencyPeriodUnit = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder includedInMrr(Boolean value) {
+      this.includedInMrr = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder showDescriptionInInvoices(Boolean value) {
+      this.showDescriptionInInvoices = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder showDescriptionInQuotes(Boolean value) {
+      this.showDescriptionInQuotes = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder priceInDecimal(String value) {
+      this.priceInDecimal = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder prorationType(ProrationType value) {
+      this.prorationType = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder tiers(List<TiersParams> value) {
+      this.tiers = value;
+      return this;
+    }
+
+    public AddonUpdateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public AddonUpdateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public AddonUpdateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public AddonUpdateParams build() {
+      return new AddonUpdateParams(this);
+    }
+  }
+
+  public enum ChargeType {
+    RECURRING("recurring"),
+
+    NON_RECURRING("non_recurring"),
+
+    /** An enum member indicating that ChargeType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChargeType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChargeType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChargeType enumValue : ChargeType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    NOT_APPLICABLE("not_applicable"),
+
+    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PeriodUnit enumValue : PeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PricingModel {
+    FLAT_FEE("flat_fee"),
+
+    PER_UNIT("per_unit"),
+
+    TIERED("tiered"),
+
+    VOLUME("volume"),
+
+    STAIRSTEP("stairstep"),
+
+    /** An enum member indicating that PricingModel was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PricingModel(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PricingModel fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PricingModel enumValue : PricingModel.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Type {
+    ON_OFF("on_off"),
+
+    QUANTITY("quantity"),
+
+    TIERED("tiered"),
+
+    VOLUME("volume"),
+
+    STAIRSTEP("stairstep"),
+
+    /** An enum member indicating that Type was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Type(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Type fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Type enumValue : Type.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AvalaraSaleType {
+    WHOLESALE("wholesale"),
+
+    RETAIL("retail"),
+
+    CONSUMED("consumed"),
+
+    VENDOR_USE("vendor_use"),
+
+    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AvalaraSaleType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AvalaraSaleType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ShippingFrequencyPeriodUnit {
+    YEAR("year"),
+
+    MONTH("month"),
+
+    WEEK("week"),
+
+    DAY("day"),
+
+    /**
+     * An enum member indicating that ShippingFrequencyPeriodUnit was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    ShippingFrequencyPeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ShippingFrequencyPeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ShippingFrequencyPeriodUnit enumValue : ShippingFrequencyPeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ProrationType {
+    SITE_DEFAULT("site_default"),
+
+    PARTIAL_TERM("partial_term"),
+
+    FULL_TERM("full_term"),
+
+    /** An enum member indicating that ProrationType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ProrationType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ProrationType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ProrationType enumValue : ProrationType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class TiersParams {
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private TiersParams(TiersBuilder builder) {
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TiersBuilder builder() {
+      return new TiersBuilder();
+    }
+
+    public static final class TiersBuilder {
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private TiersBuilder() {}
+
+      public TiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public TiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public TiersParams build() {
+        return new TiersParams(this);
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/addon/AddonCopyResponse.java b/src/main/java/com/chargebee/v4/models/addon/responses/AddonCopyResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/addon/AddonCopyResponse.java
rename to src/main/java/com/chargebee/v4/models/addon/responses/AddonCopyResponse.java
index d04353f3..c4fb53f4 100644
--- a/src/main/java/com/chargebee/v4/core/responses/addon/AddonCopyResponse.java
+++ b/src/main/java/com/chargebee/v4/models/addon/responses/AddonCopyResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.addon;
+package com.chargebee.v4.models.addon.responses;
 
-import com.chargebee.v4.core.models.addon.Addon;
+import com.chargebee.v4.models.addon.Addon;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/addon/AddonCreateResponse.java b/src/main/java/com/chargebee/v4/models/addon/responses/AddonCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/addon/AddonCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/addon/responses/AddonCreateResponse.java
index b6ac791d..9ad58dfc 100644
--- a/src/main/java/com/chargebee/v4/core/responses/addon/AddonCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/addon/responses/AddonCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.addon;
+package com.chargebee.v4.models.addon.responses;
 
-import com.chargebee.v4.core.models.addon.Addon;
+import com.chargebee.v4.models.addon.Addon;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/addon/AddonDeleteResponse.java b/src/main/java/com/chargebee/v4/models/addon/responses/AddonDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/addon/AddonDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/addon/responses/AddonDeleteResponse.java
index 1bbf0876..9cfb740a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/addon/AddonDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/addon/responses/AddonDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.addon;
+package com.chargebee.v4.models.addon.responses;
 
-import com.chargebee.v4.core.models.addon.Addon;
+import com.chargebee.v4.models.addon.Addon;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/addon/AddonListResponse.java b/src/main/java/com/chargebee/v4/models/addon/responses/AddonListResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/addon/AddonListResponse.java
rename to src/main/java/com/chargebee/v4/models/addon/responses/AddonListResponse.java
index 63f8b43e..8274e03d 100644
--- a/src/main/java/com/chargebee/v4/core/responses/addon/AddonListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/addon/responses/AddonListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.addon;
+package com.chargebee.v4.models.addon.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.addon.Addon;
+import com.chargebee.v4.models.addon.Addon;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.AddonService;
-import com.chargebee.v4.core.models.addon.params.AddonListParams;
+import com.chargebee.v4.services.AddonService;
+import com.chargebee.v4.models.addon.params.AddonListParams;
 
 /** Immutable response object for AddonList operation. Contains paginated list data. */
 public final class AddonListResponse {
@@ -95,9 +96,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public AddonListResponse nextPage() throws Exception {
+  public AddonListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/addon/responses/AddonRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/addon/responses/AddonRetrieveResponse.java
new file mode 100644
index 00000000..57b79333
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/addon/responses/AddonRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.addon.responses;
+
+import com.chargebee.v4.models.addon.Addon;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for AddonRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class AddonRetrieveResponse extends BaseResponse {
+  private final Addon addon;
+
+  private AddonRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.addon = builder.addon;
+  }
+
+  /** Parse JSON response into AddonRetrieveResponse object. */
+  public static AddonRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into AddonRetrieveResponse object with HTTP response. */
+  public static AddonRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __addonJson = JsonUtil.getObject(json, "addon");
+      if (__addonJson != null) {
+        builder.addon(Addon.fromJson(__addonJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse AddonRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for AddonRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for AddonRetrieveResponse. */
+  public static class Builder {
+
+    private Addon addon;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder addon(Addon addon) {
+      this.addon = addon;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public AddonRetrieveResponse build() {
+      return new AddonRetrieveResponse(this);
+    }
+  }
+
+  /** Get the addon from the response. */
+  public Addon getAddon() {
+    return addon;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/addon/AddonUnarchiveResponse.java b/src/main/java/com/chargebee/v4/models/addon/responses/AddonUnarchiveResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/addon/AddonUnarchiveResponse.java
rename to src/main/java/com/chargebee/v4/models/addon/responses/AddonUnarchiveResponse.java
index c71c9efc..9437a21f 100644
--- a/src/main/java/com/chargebee/v4/core/responses/addon/AddonUnarchiveResponse.java
+++ b/src/main/java/com/chargebee/v4/models/addon/responses/AddonUnarchiveResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.addon;
+package com.chargebee.v4.models.addon.responses;
 
-import com.chargebee.v4.core.models.addon.Addon;
+import com.chargebee.v4.models.addon.Addon;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/addon/AddonUpdateResponse.java b/src/main/java/com/chargebee/v4/models/addon/responses/AddonUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/addon/AddonUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/addon/responses/AddonUpdateResponse.java
index 4ee2ac87..6fac75cf 100644
--- a/src/main/java/com/chargebee/v4/core/responses/addon/AddonUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/addon/responses/AddonUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.addon;
+package com.chargebee.v4.models.addon.responses;
 
-import com.chargebee.v4.core.models.addon.Addon;
+import com.chargebee.v4.models.addon.Addon;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/address/Address.java b/src/main/java/com/chargebee/v4/models/address/Address.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/address/Address.java
rename to src/main/java/com/chargebee/v4/models/address/Address.java
index 502d8ab8..5a17d781 100644
--- a/src/main/java/com/chargebee/v4/core/models/address/Address.java
+++ b/src/main/java/com/chargebee/v4/models/address/Address.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.address;
+package com.chargebee.v4.models.address;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/address/params/AddressRetrieveParams.java b/src/main/java/com/chargebee/v4/models/address/params/AddressRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/address/params/AddressRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/address/params/AddressRetrieveParams.java
index f4a096f8..f4bd43bf 100644
--- a/src/main/java/com/chargebee/v4/core/models/address/params/AddressRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/address/params/AddressRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.address.params;
+package com.chargebee.v4.models.address.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/address/params/AddressUpdateParams.java b/src/main/java/com/chargebee/v4/models/address/params/AddressUpdateParams.java
new file mode 100644
index 00000000..0401d0b7
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/address/params/AddressUpdateParams.java
@@ -0,0 +1,392 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.address.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class AddressUpdateParams {
+
+  private final String subscriptionId;
+
+  private final String label;
+
+  private final String firstName;
+
+  private final String lastName;
+
+  private final String email;
+
+  private final String company;
+
+  private final String phone;
+
+  private final String addr;
+
+  private final String extendedAddr;
+
+  private final String extendedAddr2;
+
+  private final String city;
+
+  private final String stateCode;
+
+  private final String state;
+
+  private final String zip;
+
+  private final String country;
+
+  private final ValidationStatus validationStatus;
+
+  private AddressUpdateParams(AddressUpdateBuilder builder) {
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.label = builder.label;
+
+    this.firstName = builder.firstName;
+
+    this.lastName = builder.lastName;
+
+    this.email = builder.email;
+
+    this.company = builder.company;
+
+    this.phone = builder.phone;
+
+    this.addr = builder.addr;
+
+    this.extendedAddr = builder.extendedAddr;
+
+    this.extendedAddr2 = builder.extendedAddr2;
+
+    this.city = builder.city;
+
+    this.stateCode = builder.stateCode;
+
+    this.state = builder.state;
+
+    this.zip = builder.zip;
+
+    this.country = builder.country;
+
+    this.validationStatus = builder.validationStatus;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getLabel() {
+    return label;
+  }
+
+  public String getFirstName() {
+    return firstName;
+  }
+
+  public String getLastName() {
+    return lastName;
+  }
+
+  public String getEmail() {
+    return email;
+  }
+
+  public String getCompany() {
+    return company;
+  }
+
+  public String getPhone() {
+    return phone;
+  }
+
+  public String getAddr() {
+    return addr;
+  }
+
+  public String getExtendedAddr() {
+    return extendedAddr;
+  }
+
+  public String getExtendedAddr2() {
+    return extendedAddr2;
+  }
+
+  public String getCity() {
+    return city;
+  }
+
+  public String getStateCode() {
+    return stateCode;
+  }
+
+  public String getState() {
+    return state;
+  }
+
+  public String getZip() {
+    return zip;
+  }
+
+  public String getCountry() {
+    return country;
+  }
+
+  public ValidationStatus getValidationStatus() {
+    return validationStatus;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.label != null) {
+
+      formData.put("label", this.label);
+    }
+
+    if (this.firstName != null) {
+
+      formData.put("first_name", this.firstName);
+    }
+
+    if (this.lastName != null) {
+
+      formData.put("last_name", this.lastName);
+    }
+
+    if (this.email != null) {
+
+      formData.put("email", this.email);
+    }
+
+    if (this.company != null) {
+
+      formData.put("company", this.company);
+    }
+
+    if (this.phone != null) {
+
+      formData.put("phone", this.phone);
+    }
+
+    if (this.addr != null) {
+
+      formData.put("addr", this.addr);
+    }
+
+    if (this.extendedAddr != null) {
+
+      formData.put("extended_addr", this.extendedAddr);
+    }
+
+    if (this.extendedAddr2 != null) {
+
+      formData.put("extended_addr2", this.extendedAddr2);
+    }
+
+    if (this.city != null) {
+
+      formData.put("city", this.city);
+    }
+
+    if (this.stateCode != null) {
+
+      formData.put("state_code", this.stateCode);
+    }
+
+    if (this.state != null) {
+
+      formData.put("state", this.state);
+    }
+
+    if (this.zip != null) {
+
+      formData.put("zip", this.zip);
+    }
+
+    if (this.country != null) {
+
+      formData.put("country", this.country);
+    }
+
+    if (this.validationStatus != null) {
+
+      formData.put("validation_status", this.validationStatus);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for AddressUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static AddressUpdateBuilder builder() {
+    return new AddressUpdateBuilder();
+  }
+
+  public static final class AddressUpdateBuilder {
+
+    private String subscriptionId;
+
+    private String label;
+
+    private String firstName;
+
+    private String lastName;
+
+    private String email;
+
+    private String company;
+
+    private String phone;
+
+    private String addr;
+
+    private String extendedAddr;
+
+    private String extendedAddr2;
+
+    private String city;
+
+    private String stateCode;
+
+    private String state;
+
+    private String zip;
+
+    private String country;
+
+    private ValidationStatus validationStatus;
+
+    private AddressUpdateBuilder() {}
+
+    public AddressUpdateBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder label(String value) {
+      this.label = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder firstName(String value) {
+      this.firstName = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder lastName(String value) {
+      this.lastName = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder email(String value) {
+      this.email = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder company(String value) {
+      this.company = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder phone(String value) {
+      this.phone = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder addr(String value) {
+      this.addr = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder extendedAddr(String value) {
+      this.extendedAddr = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder extendedAddr2(String value) {
+      this.extendedAddr2 = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder city(String value) {
+      this.city = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder stateCode(String value) {
+      this.stateCode = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder state(String value) {
+      this.state = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder zip(String value) {
+      this.zip = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder country(String value) {
+      this.country = value;
+      return this;
+    }
+
+    public AddressUpdateBuilder validationStatus(ValidationStatus value) {
+      this.validationStatus = value;
+      return this;
+    }
+
+    public AddressUpdateParams build() {
+      return new AddressUpdateParams(this);
+    }
+  }
+
+  public enum ValidationStatus {
+    NOT_VALIDATED("not_validated"),
+
+    VALID("valid"),
+
+    PARTIALLY_VALID("partially_valid"),
+
+    INVALID("invalid"),
+
+    /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ValidationStatus(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ValidationStatus fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ValidationStatus enumValue : ValidationStatus.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/address/responses/AddressRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/address/responses/AddressRetrieveResponse.java
new file mode 100644
index 00000000..e945c6a9
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/address/responses/AddressRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.address.responses;
+
+import com.chargebee.v4.models.address.Address;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for AddressRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class AddressRetrieveResponse extends BaseResponse {
+  private final Address address;
+
+  private AddressRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.address = builder.address;
+  }
+
+  /** Parse JSON response into AddressRetrieveResponse object. */
+  public static AddressRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into AddressRetrieveResponse object with HTTP response. */
+  public static AddressRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __addressJson = JsonUtil.getObject(json, "address");
+      if (__addressJson != null) {
+        builder.address(Address.fromJson(__addressJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse AddressRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for AddressRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for AddressRetrieveResponse. */
+  public static class Builder {
+
+    private Address address;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder address(Address address) {
+      this.address = address;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public AddressRetrieveResponse build() {
+      return new AddressRetrieveResponse(this);
+    }
+  }
+
+  /** Get the address from the response. */
+  public Address getAddress() {
+    return address;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/address/AddressUpdateResponse.java b/src/main/java/com/chargebee/v4/models/address/responses/AddressUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/address/AddressUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/address/responses/AddressUpdateResponse.java
index 78ccf838..e4dc4635 100644
--- a/src/main/java/com/chargebee/v4/core/responses/address/AddressUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/address/responses/AddressUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.address;
+package com.chargebee.v4.models.address.responses;
 
-import com.chargebee.v4.core.models.address.Address;
+import com.chargebee.v4.models.address.Address;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/advanceInvoiceSchedule/AdvanceInvoiceSchedule.java b/src/main/java/com/chargebee/v4/models/advanceInvoiceSchedule/AdvanceInvoiceSchedule.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/advanceInvoiceSchedule/AdvanceInvoiceSchedule.java
rename to src/main/java/com/chargebee/v4/models/advanceInvoiceSchedule/AdvanceInvoiceSchedule.java
index 32d5faa5..f5b413fa 100644
--- a/src/main/java/com/chargebee/v4/core/models/advanceInvoiceSchedule/AdvanceInvoiceSchedule.java
+++ b/src/main/java/com/chargebee/v4/models/advanceInvoiceSchedule/AdvanceInvoiceSchedule.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.advanceInvoiceSchedule;
+package com.chargebee.v4.models.advanceInvoiceSchedule;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/attachedItem/AttachedItem.java b/src/main/java/com/chargebee/v4/models/attachedItem/AttachedItem.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/attachedItem/AttachedItem.java
rename to src/main/java/com/chargebee/v4/models/attachedItem/AttachedItem.java
index f4f47168..3ba27aa4 100644
--- a/src/main/java/com/chargebee/v4/core/models/attachedItem/AttachedItem.java
+++ b/src/main/java/com/chargebee/v4/models/attachedItem/AttachedItem.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.attachedItem;
+package com.chargebee.v4.models.attachedItem;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemCreateParams.java b/src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemCreateParams.java
new file mode 100644
index 00000000..4ac02431
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemCreateParams.java
@@ -0,0 +1,266 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.attachedItem.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class AttachedItemCreateParams {
+
+  private final String itemId;
+
+  private final Type type;
+
+  private final Integer billingCycles;
+
+  private final Integer quantity;
+
+  private final String quantityInDecimal;
+
+  private final ChargeOnEvent chargeOnEvent;
+
+  private final Boolean chargeOnce;
+
+  private final String businessEntityId;
+
+  private AttachedItemCreateParams(AttachedItemCreateBuilder builder) {
+
+    this.itemId = builder.itemId;
+
+    this.type = builder.type;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.quantity = builder.quantity;
+
+    this.quantityInDecimal = builder.quantityInDecimal;
+
+    this.chargeOnEvent = builder.chargeOnEvent;
+
+    this.chargeOnce = builder.chargeOnce;
+
+    this.businessEntityId = builder.businessEntityId;
+  }
+
+  public String getItemId() {
+    return itemId;
+  }
+
+  public Type getType() {
+    return type;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Integer getQuantity() {
+    return quantity;
+  }
+
+  public String getQuantityInDecimal() {
+    return quantityInDecimal;
+  }
+
+  public ChargeOnEvent getChargeOnEvent() {
+    return chargeOnEvent;
+  }
+
+  public Boolean getChargeOnce() {
+    return chargeOnce;
+  }
+
+  public String getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.itemId != null) {
+
+      formData.put("item_id", this.itemId);
+    }
+
+    if (this.type != null) {
+
+      formData.put("type", this.type);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.quantity != null) {
+
+      formData.put("quantity", this.quantity);
+    }
+
+    if (this.quantityInDecimal != null) {
+
+      formData.put("quantity_in_decimal", this.quantityInDecimal);
+    }
+
+    if (this.chargeOnEvent != null) {
+
+      formData.put("charge_on_event", this.chargeOnEvent);
+    }
+
+    if (this.chargeOnce != null) {
+
+      formData.put("charge_once", this.chargeOnce);
+    }
+
+    if (this.businessEntityId != null) {
+
+      formData.put("business_entity_id", this.businessEntityId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for AttachedItemCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static AttachedItemCreateBuilder builder() {
+    return new AttachedItemCreateBuilder();
+  }
+
+  public static final class AttachedItemCreateBuilder {
+
+    private String itemId;
+
+    private Type type;
+
+    private Integer billingCycles;
+
+    private Integer quantity;
+
+    private String quantityInDecimal;
+
+    private ChargeOnEvent chargeOnEvent;
+
+    private Boolean chargeOnce;
+
+    private String businessEntityId;
+
+    private AttachedItemCreateBuilder() {}
+
+    public AttachedItemCreateBuilder itemId(String value) {
+      this.itemId = value;
+      return this;
+    }
+
+    public AttachedItemCreateBuilder type(Type value) {
+      this.type = value;
+      return this;
+    }
+
+    public AttachedItemCreateBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public AttachedItemCreateBuilder quantity(Integer value) {
+      this.quantity = value;
+      return this;
+    }
+
+    public AttachedItemCreateBuilder quantityInDecimal(String value) {
+      this.quantityInDecimal = value;
+      return this;
+    }
+
+    public AttachedItemCreateBuilder chargeOnEvent(ChargeOnEvent value) {
+      this.chargeOnEvent = value;
+      return this;
+    }
+
+    public AttachedItemCreateBuilder chargeOnce(Boolean value) {
+      this.chargeOnce = value;
+      return this;
+    }
+
+    public AttachedItemCreateBuilder businessEntityId(String value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public AttachedItemCreateParams build() {
+      return new AttachedItemCreateParams(this);
+    }
+  }
+
+  public enum Type {
+    RECOMMENDED("recommended"),
+
+    MANDATORY("mandatory"),
+
+    OPTIONAL("optional"),
+
+    /** An enum member indicating that Type was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Type(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Type fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Type enumValue : Type.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChargeOnEvent {
+    SUBSCRIPTION_CREATION("subscription_creation"),
+
+    SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+    PLAN_ACTIVATION("plan_activation"),
+
+    SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+    CONTRACT_TERMINATION("contract_termination"),
+
+    ON_DEMAND("on_demand"),
+
+    /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChargeOnEvent(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChargeOnEvent fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemDeleteParams.java b/src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemDeleteParams.java
new file mode 100644
index 00000000..95906225
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemDeleteParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.attachedItem.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class AttachedItemDeleteParams {
+
+  private final String parentItemId;
+
+  private AttachedItemDeleteParams(AttachedItemDeleteBuilder builder) {
+
+    this.parentItemId = builder.parentItemId;
+  }
+
+  public String getParentItemId() {
+    return parentItemId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.parentItemId != null) {
+
+      formData.put("parent_item_id", this.parentItemId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for AttachedItemDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static AttachedItemDeleteBuilder builder() {
+    return new AttachedItemDeleteBuilder();
+  }
+
+  public static final class AttachedItemDeleteBuilder {
+
+    private String parentItemId;
+
+    private AttachedItemDeleteBuilder() {}
+
+    public AttachedItemDeleteBuilder parentItemId(String value) {
+      this.parentItemId = value;
+      return this;
+    }
+
+    public AttachedItemDeleteParams build() {
+      return new AttachedItemDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemListParams.java b/src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemListParams.java
rename to src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemListParams.java
index 9b450125..e2cbd5b2 100644
--- a/src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemListParams.java
+++ b/src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.attachedItem.params;
+package com.chargebee.v4.models.attachedItem.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemRetrieveParams.java b/src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemRetrieveParams.java
index 816ec80d..6d8c758e 100644
--- a/src/main/java/com/chargebee/v4/core/models/attachedItem/params/AttachedItemRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.attachedItem.params;
+package com.chargebee.v4.models.attachedItem.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemUpdateParams.java b/src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemUpdateParams.java
new file mode 100644
index 00000000..fe0c986f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/attachedItem/params/AttachedItemUpdateParams.java
@@ -0,0 +1,246 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.attachedItem.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class AttachedItemUpdateParams {
+
+  private final String parentItemId;
+
+  private final Type type;
+
+  private final Integer billingCycles;
+
+  private final Integer quantity;
+
+  private final String quantityInDecimal;
+
+  private final ChargeOnEvent chargeOnEvent;
+
+  private final Boolean chargeOnce;
+
+  private AttachedItemUpdateParams(AttachedItemUpdateBuilder builder) {
+
+    this.parentItemId = builder.parentItemId;
+
+    this.type = builder.type;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.quantity = builder.quantity;
+
+    this.quantityInDecimal = builder.quantityInDecimal;
+
+    this.chargeOnEvent = builder.chargeOnEvent;
+
+    this.chargeOnce = builder.chargeOnce;
+  }
+
+  public String getParentItemId() {
+    return parentItemId;
+  }
+
+  public Type getType() {
+    return type;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Integer getQuantity() {
+    return quantity;
+  }
+
+  public String getQuantityInDecimal() {
+    return quantityInDecimal;
+  }
+
+  public ChargeOnEvent getChargeOnEvent() {
+    return chargeOnEvent;
+  }
+
+  public Boolean getChargeOnce() {
+    return chargeOnce;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.parentItemId != null) {
+
+      formData.put("parent_item_id", this.parentItemId);
+    }
+
+    if (this.type != null) {
+
+      formData.put("type", this.type);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.quantity != null) {
+
+      formData.put("quantity", this.quantity);
+    }
+
+    if (this.quantityInDecimal != null) {
+
+      formData.put("quantity_in_decimal", this.quantityInDecimal);
+    }
+
+    if (this.chargeOnEvent != null) {
+
+      formData.put("charge_on_event", this.chargeOnEvent);
+    }
+
+    if (this.chargeOnce != null) {
+
+      formData.put("charge_once", this.chargeOnce);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for AttachedItemUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static AttachedItemUpdateBuilder builder() {
+    return new AttachedItemUpdateBuilder();
+  }
+
+  public static final class AttachedItemUpdateBuilder {
+
+    private String parentItemId;
+
+    private Type type;
+
+    private Integer billingCycles;
+
+    private Integer quantity;
+
+    private String quantityInDecimal;
+
+    private ChargeOnEvent chargeOnEvent;
+
+    private Boolean chargeOnce;
+
+    private AttachedItemUpdateBuilder() {}
+
+    public AttachedItemUpdateBuilder parentItemId(String value) {
+      this.parentItemId = value;
+      return this;
+    }
+
+    public AttachedItemUpdateBuilder type(Type value) {
+      this.type = value;
+      return this;
+    }
+
+    public AttachedItemUpdateBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public AttachedItemUpdateBuilder quantity(Integer value) {
+      this.quantity = value;
+      return this;
+    }
+
+    public AttachedItemUpdateBuilder quantityInDecimal(String value) {
+      this.quantityInDecimal = value;
+      return this;
+    }
+
+    public AttachedItemUpdateBuilder chargeOnEvent(ChargeOnEvent value) {
+      this.chargeOnEvent = value;
+      return this;
+    }
+
+    public AttachedItemUpdateBuilder chargeOnce(Boolean value) {
+      this.chargeOnce = value;
+      return this;
+    }
+
+    public AttachedItemUpdateParams build() {
+      return new AttachedItemUpdateParams(this);
+    }
+  }
+
+  public enum Type {
+    RECOMMENDED("recommended"),
+
+    MANDATORY("mandatory"),
+
+    OPTIONAL("optional"),
+
+    /** An enum member indicating that Type was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Type(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Type fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Type enumValue : Type.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChargeOnEvent {
+    SUBSCRIPTION_CREATION("subscription_creation"),
+
+    SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+    PLAN_ACTIVATION("plan_activation"),
+
+    SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+    CONTRACT_TERMINATION("contract_termination"),
+
+    ON_DEMAND("on_demand"),
+
+    /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChargeOnEvent(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChargeOnEvent fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemCreateResponse.java b/src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemCreateResponse.java
index d928c483..917e8274 100644
--- a/src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.attachedItem;
+package com.chargebee.v4.models.attachedItem.responses;
 
-import com.chargebee.v4.core.models.attachedItem.AttachedItem;
+import com.chargebee.v4.models.attachedItem.AttachedItem;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemDeleteResponse.java b/src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemDeleteResponse.java
index 7ab66eb9..7b3c9e64 100644
--- a/src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.attachedItem;
+package com.chargebee.v4.models.attachedItem.responses;
 
-import com.chargebee.v4.core.models.attachedItem.AttachedItem;
+import com.chargebee.v4.models.attachedItem.AttachedItem;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemListResponse.java b/src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemListResponse.java
rename to src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemListResponse.java
index fd574919..fd34422a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.attachedItem;
+package com.chargebee.v4.models.attachedItem.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.attachedItem.AttachedItem;
+import com.chargebee.v4.models.attachedItem.AttachedItem;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.AttachedItemService;
-import com.chargebee.v4.core.models.attachedItem.params.AttachedItemListParams;
+import com.chargebee.v4.services.AttachedItemService;
+import com.chargebee.v4.models.attachedItem.params.AttachedItemListParams;
 
 /** Immutable response object for AttachedItemList operation. Contains paginated list data. */
 public final class AttachedItemListResponse {
@@ -105,9 +106,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public AttachedItemListResponse nextPage() throws Exception {
+  public AttachedItemListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemRetrieveResponse.java
new file mode 100644
index 00000000..7f6e4d3a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.attachedItem.responses;
+
+import com.chargebee.v4.models.attachedItem.AttachedItem;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for AttachedItemRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class AttachedItemRetrieveResponse extends BaseResponse {
+  private final AttachedItem attachedItem;
+
+  private AttachedItemRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.attachedItem = builder.attachedItem;
+  }
+
+  /** Parse JSON response into AttachedItemRetrieveResponse object. */
+  public static AttachedItemRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into AttachedItemRetrieveResponse object with HTTP response. */
+  public static AttachedItemRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __attachedItemJson = JsonUtil.getObject(json, "attached_item");
+      if (__attachedItemJson != null) {
+        builder.attachedItem(AttachedItem.fromJson(__attachedItemJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse AttachedItemRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for AttachedItemRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for AttachedItemRetrieveResponse. */
+  public static class Builder {
+
+    private AttachedItem attachedItem;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder attachedItem(AttachedItem attachedItem) {
+      this.attachedItem = attachedItem;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public AttachedItemRetrieveResponse build() {
+      return new AttachedItemRetrieveResponse(this);
+    }
+  }
+
+  /** Get the attachedItem from the response. */
+  public AttachedItem getAttachedItem() {
+    return attachedItem;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemUpdateResponse.java b/src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemUpdateResponse.java
index 595cced6..bc37ecae 100644
--- a/src/main/java/com/chargebee/v4/core/responses/attachedItem/AttachedItemUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.attachedItem;
+package com.chargebee.v4.models.attachedItem.responses;
 
-import com.chargebee.v4.core.models.attachedItem.AttachedItem;
+import com.chargebee.v4.models.attachedItem.AttachedItem;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/attribute/Attribute.java b/src/main/java/com/chargebee/v4/models/attribute/Attribute.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/attribute/Attribute.java
rename to src/main/java/com/chargebee/v4/models/attribute/Attribute.java
index 650533e8..9edca57d 100644
--- a/src/main/java/com/chargebee/v4/core/models/attribute/Attribute.java
+++ b/src/main/java/com/chargebee/v4/models/attribute/Attribute.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.attribute;
+package com.chargebee.v4.models.attribute;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/billingConfiguration/BillingConfiguration.java b/src/main/java/com/chargebee/v4/models/billingConfiguration/BillingConfiguration.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/billingConfiguration/BillingConfiguration.java
rename to src/main/java/com/chargebee/v4/models/billingConfiguration/BillingConfiguration.java
index 1632f6dc..3531f9ad 100644
--- a/src/main/java/com/chargebee/v4/core/models/billingConfiguration/BillingConfiguration.java
+++ b/src/main/java/com/chargebee/v4/models/billingConfiguration/BillingConfiguration.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.billingConfiguration;
+package com.chargebee.v4.models.billingConfiguration;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/brand/Brand.java b/src/main/java/com/chargebee/v4/models/brand/Brand.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/brand/Brand.java
rename to src/main/java/com/chargebee/v4/models/brand/Brand.java
index 95794ca8..c518a870 100644
--- a/src/main/java/com/chargebee/v4/core/models/brand/Brand.java
+++ b/src/main/java/com/chargebee/v4/models/brand/Brand.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.brand;
+package com.chargebee.v4.models.brand;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/brandConfiguration/params/BrandConfigurationRetrieveParams.java b/src/main/java/com/chargebee/v4/models/brandConfiguration/params/BrandConfigurationRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/brandConfiguration/params/BrandConfigurationRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/brandConfiguration/params/BrandConfigurationRetrieveParams.java
index 881d02c6..dfeeec97 100644
--- a/src/main/java/com/chargebee/v4/core/models/brandConfiguration/params/BrandConfigurationRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/brandConfiguration/params/BrandConfigurationRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.brandConfiguration.params;
+package com.chargebee.v4.models.brandConfiguration.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/brandConfiguration/responses/BrandConfigurationRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/brandConfiguration/responses/BrandConfigurationRetrieveResponse.java
new file mode 100644
index 00000000..3fd5d880
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/brandConfiguration/responses/BrandConfigurationRetrieveResponse.java
@@ -0,0 +1,72 @@
+package com.chargebee.v4.models.brandConfiguration.responses;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for BrandConfigurationRetrieve operation. Contains the response data
+ * from a single resource get operation.
+ */
+public final class BrandConfigurationRetrieveResponse extends BaseResponse {
+  private final Object brandConfiguration;
+
+  private BrandConfigurationRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.brandConfiguration = builder.brandConfiguration;
+  }
+
+  /** Parse JSON response into BrandConfigurationRetrieveResponse object. */
+  public static BrandConfigurationRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into BrandConfigurationRetrieveResponse object with HTTP response. */
+  public static BrandConfigurationRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.brandConfiguration(JsonUtil.getObject(json, "brand_configuration"));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse BrandConfigurationRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for BrandConfigurationRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for BrandConfigurationRetrieveResponse. */
+  public static class Builder {
+
+    private Object brandConfiguration;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder brandConfiguration(Object brandConfiguration) {
+      this.brandConfiguration = brandConfiguration;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public BrandConfigurationRetrieveResponse build() {
+      return new BrandConfigurationRetrieveResponse(this);
+    }
+  }
+
+  /** Get the brandConfiguration from the response. */
+  public Object getBrandConfiguration() {
+    return brandConfiguration;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/businessEntity/BusinessEntity.java b/src/main/java/com/chargebee/v4/models/businessEntity/BusinessEntity.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/businessEntity/BusinessEntity.java
rename to src/main/java/com/chargebee/v4/models/businessEntity/BusinessEntity.java
index 5f4c0f59..5c2346b9 100644
--- a/src/main/java/com/chargebee/v4/core/models/businessEntity/BusinessEntity.java
+++ b/src/main/java/com/chargebee/v4/models/businessEntity/BusinessEntity.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.businessEntity;
+package com.chargebee.v4.models.businessEntity;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/businessEntity/params/BusinessEntityCreateTransfersParams.java b/src/main/java/com/chargebee/v4/models/businessEntity/params/BusinessEntityCreateTransfersParams.java
new file mode 100644
index 00000000..21ccbaa2
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/businessEntity/params/BusinessEntityCreateTransfersParams.java
@@ -0,0 +1,143 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.businessEntity.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class BusinessEntityCreateTransfersParams {
+
+  private final List<String> activeResourceIds;
+
+  private final List<String> destinationBusinessEntityIds;
+
+  private final List<String> sourceBusinessEntityIds;
+
+  private final List<String> resourceTypes;
+
+  private final List<String> reasonCodes;
+
+  private BusinessEntityCreateTransfersParams(BusinessEntityCreateTransfersBuilder builder) {
+
+    this.activeResourceIds = builder.activeResourceIds;
+
+    this.destinationBusinessEntityIds = builder.destinationBusinessEntityIds;
+
+    this.sourceBusinessEntityIds = builder.sourceBusinessEntityIds;
+
+    this.resourceTypes = builder.resourceTypes;
+
+    this.reasonCodes = builder.reasonCodes;
+  }
+
+  public List<String> getActiveResourceIds() {
+    return activeResourceIds;
+  }
+
+  public List<String> getDestinationBusinessEntityIds() {
+    return destinationBusinessEntityIds;
+  }
+
+  public List<String> getSourceBusinessEntityIds() {
+    return sourceBusinessEntityIds;
+  }
+
+  public List<String> getResourceTypes() {
+    return resourceTypes;
+  }
+
+  public List<String> getReasonCodes() {
+    return reasonCodes;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.activeResourceIds != null) {
+
+      formData.put("active_resource_ids", this.activeResourceIds);
+    }
+
+    if (this.destinationBusinessEntityIds != null) {
+
+      formData.put("destination_business_entity_ids", this.destinationBusinessEntityIds);
+    }
+
+    if (this.sourceBusinessEntityIds != null) {
+
+      formData.put("source_business_entity_ids", this.sourceBusinessEntityIds);
+    }
+
+    if (this.resourceTypes != null) {
+
+      formData.put("resource_types", this.resourceTypes);
+    }
+
+    if (this.reasonCodes != null) {
+
+      formData.put("reason_codes", this.reasonCodes);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for BusinessEntityCreateTransfersParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static BusinessEntityCreateTransfersBuilder builder() {
+    return new BusinessEntityCreateTransfersBuilder();
+  }
+
+  public static final class BusinessEntityCreateTransfersBuilder {
+
+    private List<String> activeResourceIds;
+
+    private List<String> destinationBusinessEntityIds;
+
+    private List<String> sourceBusinessEntityIds;
+
+    private List<String> resourceTypes;
+
+    private List<String> reasonCodes;
+
+    private BusinessEntityCreateTransfersBuilder() {}
+
+    public BusinessEntityCreateTransfersBuilder activeResourceIds(List<String> value) {
+      this.activeResourceIds = value;
+      return this;
+    }
+
+    public BusinessEntityCreateTransfersBuilder destinationBusinessEntityIds(List<String> value) {
+      this.destinationBusinessEntityIds = value;
+      return this;
+    }
+
+    @Deprecated
+    public BusinessEntityCreateTransfersBuilder sourceBusinessEntityIds(List<String> value) {
+      this.sourceBusinessEntityIds = value;
+      return this;
+    }
+
+    @Deprecated
+    public BusinessEntityCreateTransfersBuilder resourceTypes(List<String> value) {
+      this.resourceTypes = value;
+      return this;
+    }
+
+    public BusinessEntityCreateTransfersBuilder reasonCodes(List<String> value) {
+      this.reasonCodes = value;
+      return this;
+    }
+
+    public BusinessEntityCreateTransfersParams build() {
+      return new BusinessEntityCreateTransfersParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/businessEntity/params/BusinessEntityGetTransfersParams.java b/src/main/java/com/chargebee/v4/models/businessEntity/params/BusinessEntityGetTransfersParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/businessEntity/params/BusinessEntityGetTransfersParams.java
rename to src/main/java/com/chargebee/v4/models/businessEntity/params/BusinessEntityGetTransfersParams.java
index 247f1bdc..7d0fad79 100644
--- a/src/main/java/com/chargebee/v4/core/models/businessEntity/params/BusinessEntityGetTransfersParams.java
+++ b/src/main/java/com/chargebee/v4/models/businessEntity/params/BusinessEntityGetTransfersParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.businessEntity.params;
+package com.chargebee.v4.models.businessEntity.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/businessEntity/BusinessEntityCreateTransfersResponse.java b/src/main/java/com/chargebee/v4/models/businessEntity/responses/BusinessEntityCreateTransfersResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/businessEntity/BusinessEntityCreateTransfersResponse.java
rename to src/main/java/com/chargebee/v4/models/businessEntity/responses/BusinessEntityCreateTransfersResponse.java
index 817f1a0f..470bc95d 100644
--- a/src/main/java/com/chargebee/v4/core/responses/businessEntity/BusinessEntityCreateTransfersResponse.java
+++ b/src/main/java/com/chargebee/v4/models/businessEntity/responses/BusinessEntityCreateTransfersResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.businessEntity;
+package com.chargebee.v4.models.businessEntity.responses;
 
-import com.chargebee.v4.core.models.businessEntityTransfer.BusinessEntityTransfer;
+import com.chargebee.v4.models.businessEntityTransfer.BusinessEntityTransfer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/businessEntity/BusinessEntityGetTransfersResponse.java b/src/main/java/com/chargebee/v4/models/businessEntity/responses/BusinessEntityGetTransfersResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/businessEntity/BusinessEntityGetTransfersResponse.java
rename to src/main/java/com/chargebee/v4/models/businessEntity/responses/BusinessEntityGetTransfersResponse.java
index a4997665..7a748ecc 100644
--- a/src/main/java/com/chargebee/v4/core/responses/businessEntity/BusinessEntityGetTransfersResponse.java
+++ b/src/main/java/com/chargebee/v4/models/businessEntity/responses/BusinessEntityGetTransfersResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.businessEntity;
+package com.chargebee.v4.models.businessEntity.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.businessEntityTransfer.BusinessEntityTransfer;
+import com.chargebee.v4.models.businessEntityTransfer.BusinessEntityTransfer;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.BusinessEntityService;
-import com.chargebee.v4.core.models.businessEntity.params.BusinessEntityGetTransfersParams;
+import com.chargebee.v4.services.BusinessEntityService;
+import com.chargebee.v4.models.businessEntity.params.BusinessEntityGetTransfersParams;
 
 /**
  * Immutable response object for BusinessEntityGetTransfers operation. Contains paginated list data.
@@ -101,9 +102,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public BusinessEntityGetTransfersResponse nextPage() throws Exception {
+  public BusinessEntityGetTransfersResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/models/businessEntityTransfer/BusinessEntityTransfer.java b/src/main/java/com/chargebee/v4/models/businessEntityTransfer/BusinessEntityTransfer.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/businessEntityTransfer/BusinessEntityTransfer.java
rename to src/main/java/com/chargebee/v4/models/businessEntityTransfer/BusinessEntityTransfer.java
index 96a46129..88f8b785 100644
--- a/src/main/java/com/chargebee/v4/core/models/businessEntityTransfer/BusinessEntityTransfer.java
+++ b/src/main/java/com/chargebee/v4/models/businessEntityTransfer/BusinessEntityTransfer.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.businessEntityTransfer;
+package com.chargebee.v4.models.businessEntityTransfer;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/businessProfile/params/BusinessProfileRetrieveParams.java b/src/main/java/com/chargebee/v4/models/businessProfile/params/BusinessProfileRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/businessProfile/params/BusinessProfileRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/businessProfile/params/BusinessProfileRetrieveParams.java
index d0829ddb..2b576bdb 100644
--- a/src/main/java/com/chargebee/v4/core/models/businessProfile/params/BusinessProfileRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/businessProfile/params/BusinessProfileRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.businessProfile.params;
+package com.chargebee.v4.models.businessProfile.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/businessProfile/responses/BusinessProfileRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/businessProfile/responses/BusinessProfileRetrieveResponse.java
new file mode 100644
index 00000000..6ba38700
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/businessProfile/responses/BusinessProfileRetrieveResponse.java
@@ -0,0 +1,72 @@
+package com.chargebee.v4.models.businessProfile.responses;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for BusinessProfileRetrieve operation. Contains the response data from
+ * a single resource get operation.
+ */
+public final class BusinessProfileRetrieveResponse extends BaseResponse {
+  private final Object businessProfile;
+
+  private BusinessProfileRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.businessProfile = builder.businessProfile;
+  }
+
+  /** Parse JSON response into BusinessProfileRetrieveResponse object. */
+  public static BusinessProfileRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into BusinessProfileRetrieveResponse object with HTTP response. */
+  public static BusinessProfileRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.businessProfile(JsonUtil.getObject(json, "business_profile"));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse BusinessProfileRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for BusinessProfileRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for BusinessProfileRetrieveResponse. */
+  public static class Builder {
+
+    private Object businessProfile;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder businessProfile(Object businessProfile) {
+      this.businessProfile = businessProfile;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public BusinessProfileRetrieveResponse build() {
+      return new BusinessProfileRetrieveResponse(this);
+    }
+  }
+
+  /** Get the businessProfile from the response. */
+  public Object getBusinessProfile() {
+    return businessProfile;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/card/Card.java b/src/main/java/com/chargebee/v4/models/card/Card.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/card/Card.java
rename to src/main/java/com/chargebee/v4/models/card/Card.java
index 1c70a3f3..73f56b4c 100644
--- a/src/main/java/com/chargebee/v4/core/models/card/Card.java
+++ b/src/main/java/com/chargebee/v4/models/card/Card.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.card;
+package com.chargebee.v4.models.card;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -294,6 +294,8 @@ public enum Gateway {
 
     DEUTSCHE_BANK("deutsche_bank"),
 
+    EZIDEBIT("ezidebit"),
+
     NOT_APPLICABLE("not_applicable"),
 
     /** An enum member indicating that Gateway was instantiated with an unknown value. */
diff --git a/src/main/java/com/chargebee/v4/core/models/card/params/CardRetrieveParams.java b/src/main/java/com/chargebee/v4/models/card/params/CardRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/card/params/CardRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/card/params/CardRetrieveParams.java
index 866e7a46..3bd0b2e5 100644
--- a/src/main/java/com/chargebee/v4/core/models/card/params/CardRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/card/params/CardRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.card.params;
+package com.chargebee.v4.models.card.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/card/params/CardSwitchGatewayForCustomerParams.java b/src/main/java/com/chargebee/v4/models/card/params/CardSwitchGatewayForCustomerParams.java
similarity index 81%
rename from src/main/java/com/chargebee/v4/core/models/card/params/CardSwitchGatewayForCustomerParams.java
rename to src/main/java/com/chargebee/v4/models/card/params/CardSwitchGatewayForCustomerParams.java
index d0d13167..66ffffe6 100644
--- a/src/main/java/com/chargebee/v4/core/models/card/params/CardSwitchGatewayForCustomerParams.java
+++ b/src/main/java/com/chargebee/v4/models/card/params/CardSwitchGatewayForCustomerParams.java
@@ -4,24 +4,48 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.card.params;
+package com.chargebee.v4.models.card.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class CardSwitchGatewayForCustomerParams {
 
-  private final Map<String, Object> formData;
+  private final Gateway gateway;
+
+  private final String gatewayAccountId;
 
   private CardSwitchGatewayForCustomerParams(CardSwitchGatewayForCustomerBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
+
+    this.gateway = builder.gateway;
+
+    this.gatewayAccountId = builder.gatewayAccountId;
+  }
+
+  public Gateway getGateway() {
+    return gateway;
+  }
+
+  public String getGatewayAccountId() {
+    return gatewayAccountId;
   }
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.gateway != null) {
+
+      formData.put("gateway", this.gateway);
+    }
+
+    if (this.gatewayAccountId != null) {
+
+      formData.put("gateway_account_id", this.gatewayAccountId);
+    }
+
     return formData;
   }
 
@@ -32,22 +56,21 @@ public static CardSwitchGatewayForCustomerBuilder builder() {
   }
 
   public static final class CardSwitchGatewayForCustomerBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
+
+    private Gateway gateway;
+
+    private String gatewayAccountId;
 
     private CardSwitchGatewayForCustomerBuilder() {}
 
     @Deprecated
     public CardSwitchGatewayForCustomerBuilder gateway(Gateway value) {
-
-      formData.put("gateway", value);
-
+      this.gateway = value;
       return this;
     }
 
     public CardSwitchGatewayForCustomerBuilder gatewayAccountId(String value) {
-
-      formData.put("gateway_account_id", value);
-
+      this.gatewayAccountId = value;
       return this;
     }
 
@@ -155,6 +178,8 @@ public enum Gateway {
 
     DEUTSCHE_BANK("deutsche_bank"),
 
+    EZIDEBIT("ezidebit"),
+
     /** An enum member indicating that Gateway was instantiated with an unknown value. */
     _UNKNOWN(null);
     private final String value;
diff --git a/src/main/java/com/chargebee/v4/models/card/params/CopyCardForCustomerParams.java b/src/main/java/com/chargebee/v4/models/card/params/CopyCardForCustomerParams.java
new file mode 100644
index 00000000..f7f4e8dc
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/card/params/CopyCardForCustomerParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.card.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CopyCardForCustomerParams {
+
+  private final String gatewayAccountId;
+
+  private CopyCardForCustomerParams(CopyCardForCustomerBuilder builder) {
+
+    this.gatewayAccountId = builder.gatewayAccountId;
+  }
+
+  public String getGatewayAccountId() {
+    return gatewayAccountId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.gatewayAccountId != null) {
+
+      formData.put("gateway_account_id", this.gatewayAccountId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CopyCardForCustomerParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CopyCardForCustomerBuilder builder() {
+    return new CopyCardForCustomerBuilder();
+  }
+
+  public static final class CopyCardForCustomerBuilder {
+
+    private String gatewayAccountId;
+
+    private CopyCardForCustomerBuilder() {}
+
+    public CopyCardForCustomerBuilder gatewayAccountId(String value) {
+      this.gatewayAccountId = value;
+      return this;
+    }
+
+    public CopyCardForCustomerParams build() {
+      return new CopyCardForCustomerParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/card/params/DeleteCardForCustomerParams.java b/src/main/java/com/chargebee/v4/models/card/params/DeleteCardForCustomerParams.java
new file mode 100644
index 00000000..a438d4e6
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/card/params/DeleteCardForCustomerParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.card.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class DeleteCardForCustomerParams {
+
+  private DeleteCardForCustomerParams(DeleteCardForCustomerBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for DeleteCardForCustomerParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static DeleteCardForCustomerBuilder builder() {
+    return new DeleteCardForCustomerBuilder();
+  }
+
+  public static final class DeleteCardForCustomerBuilder {
+
+    private DeleteCardForCustomerBuilder() {}
+
+    public DeleteCardForCustomerParams build() {
+      return new DeleteCardForCustomerParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/card/params/UpdateCardForCustomerParams.java b/src/main/java/com/chargebee/v4/models/card/params/UpdateCardForCustomerParams.java
new file mode 100644
index 00000000..9f2e076f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/card/params/UpdateCardForCustomerParams.java
@@ -0,0 +1,641 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.card.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class UpdateCardForCustomerParams {
+
+  private final Gateway gateway;
+
+  private final String gatewayAccountId;
+
+  private final String tmpToken;
+
+  private final String firstName;
+
+  private final String lastName;
+
+  private final String number;
+
+  private final Integer expiryMonth;
+
+  private final Integer expiryYear;
+
+  private final String cvv;
+
+  private final PreferredScheme preferredScheme;
+
+  private final String billingAddr1;
+
+  private final String billingAddr2;
+
+  private final String billingCity;
+
+  private final String billingStateCode;
+
+  private final String billingState;
+
+  private final String billingZip;
+
+  private final String billingCountry;
+
+  private final String ipAddress;
+
+  private final CustomerParams customer;
+
+  private UpdateCardForCustomerParams(UpdateCardForCustomerBuilder builder) {
+
+    this.gateway = builder.gateway;
+
+    this.gatewayAccountId = builder.gatewayAccountId;
+
+    this.tmpToken = builder.tmpToken;
+
+    this.firstName = builder.firstName;
+
+    this.lastName = builder.lastName;
+
+    this.number = builder.number;
+
+    this.expiryMonth = builder.expiryMonth;
+
+    this.expiryYear = builder.expiryYear;
+
+    this.cvv = builder.cvv;
+
+    this.preferredScheme = builder.preferredScheme;
+
+    this.billingAddr1 = builder.billingAddr1;
+
+    this.billingAddr2 = builder.billingAddr2;
+
+    this.billingCity = builder.billingCity;
+
+    this.billingStateCode = builder.billingStateCode;
+
+    this.billingState = builder.billingState;
+
+    this.billingZip = builder.billingZip;
+
+    this.billingCountry = builder.billingCountry;
+
+    this.ipAddress = builder.ipAddress;
+
+    this.customer = builder.customer;
+  }
+
+  public Gateway getGateway() {
+    return gateway;
+  }
+
+  public String getGatewayAccountId() {
+    return gatewayAccountId;
+  }
+
+  public String getTmpToken() {
+    return tmpToken;
+  }
+
+  public String getFirstName() {
+    return firstName;
+  }
+
+  public String getLastName() {
+    return lastName;
+  }
+
+  public String getNumber() {
+    return number;
+  }
+
+  public Integer getExpiryMonth() {
+    return expiryMonth;
+  }
+
+  public Integer getExpiryYear() {
+    return expiryYear;
+  }
+
+  public String getCvv() {
+    return cvv;
+  }
+
+  public PreferredScheme getPreferredScheme() {
+    return preferredScheme;
+  }
+
+  public String getBillingAddr1() {
+    return billingAddr1;
+  }
+
+  public String getBillingAddr2() {
+    return billingAddr2;
+  }
+
+  public String getBillingCity() {
+    return billingCity;
+  }
+
+  public String getBillingStateCode() {
+    return billingStateCode;
+  }
+
+  public String getBillingState() {
+    return billingState;
+  }
+
+  public String getBillingZip() {
+    return billingZip;
+  }
+
+  public String getBillingCountry() {
+    return billingCountry;
+  }
+
+  public String getIpAddress() {
+    return ipAddress;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.gateway != null) {
+
+      formData.put("gateway", this.gateway);
+    }
+
+    if (this.gatewayAccountId != null) {
+
+      formData.put("gateway_account_id", this.gatewayAccountId);
+    }
+
+    if (this.tmpToken != null) {
+
+      formData.put("tmp_token", this.tmpToken);
+    }
+
+    if (this.firstName != null) {
+
+      formData.put("first_name", this.firstName);
+    }
+
+    if (this.lastName != null) {
+
+      formData.put("last_name", this.lastName);
+    }
+
+    if (this.number != null) {
+
+      formData.put("number", this.number);
+    }
+
+    if (this.expiryMonth != null) {
+
+      formData.put("expiry_month", this.expiryMonth);
+    }
+
+    if (this.expiryYear != null) {
+
+      formData.put("expiry_year", this.expiryYear);
+    }
+
+    if (this.cvv != null) {
+
+      formData.put("cvv", this.cvv);
+    }
+
+    if (this.preferredScheme != null) {
+
+      formData.put("preferred_scheme", this.preferredScheme);
+    }
+
+    if (this.billingAddr1 != null) {
+
+      formData.put("billing_addr1", this.billingAddr1);
+    }
+
+    if (this.billingAddr2 != null) {
+
+      formData.put("billing_addr2", this.billingAddr2);
+    }
+
+    if (this.billingCity != null) {
+
+      formData.put("billing_city", this.billingCity);
+    }
+
+    if (this.billingStateCode != null) {
+
+      formData.put("billing_state_code", this.billingStateCode);
+    }
+
+    if (this.billingState != null) {
+
+      formData.put("billing_state", this.billingState);
+    }
+
+    if (this.billingZip != null) {
+
+      formData.put("billing_zip", this.billingZip);
+    }
+
+    if (this.billingCountry != null) {
+
+      formData.put("billing_country", this.billingCountry);
+    }
+
+    if (this.ipAddress != null) {
+
+      formData.put("ip_address", this.ipAddress);
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for UpdateCardForCustomerParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UpdateCardForCustomerBuilder builder() {
+    return new UpdateCardForCustomerBuilder();
+  }
+
+  public static final class UpdateCardForCustomerBuilder {
+
+    private Gateway gateway;
+
+    private String gatewayAccountId;
+
+    private String tmpToken;
+
+    private String firstName;
+
+    private String lastName;
+
+    private String number;
+
+    private Integer expiryMonth;
+
+    private Integer expiryYear;
+
+    private String cvv;
+
+    private PreferredScheme preferredScheme;
+
+    private String billingAddr1;
+
+    private String billingAddr2;
+
+    private String billingCity;
+
+    private String billingStateCode;
+
+    private String billingState;
+
+    private String billingZip;
+
+    private String billingCountry;
+
+    private String ipAddress;
+
+    private CustomerParams customer;
+
+    private UpdateCardForCustomerBuilder() {}
+
+    @Deprecated
+    public UpdateCardForCustomerBuilder gateway(Gateway value) {
+      this.gateway = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder gatewayAccountId(String value) {
+      this.gatewayAccountId = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder tmpToken(String value) {
+      this.tmpToken = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder firstName(String value) {
+      this.firstName = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder lastName(String value) {
+      this.lastName = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder number(String value) {
+      this.number = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder expiryMonth(Integer value) {
+      this.expiryMonth = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder expiryYear(Integer value) {
+      this.expiryYear = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder cvv(String value) {
+      this.cvv = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder preferredScheme(PreferredScheme value) {
+      this.preferredScheme = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder billingAddr1(String value) {
+      this.billingAddr1 = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder billingAddr2(String value) {
+      this.billingAddr2 = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder billingCity(String value) {
+      this.billingCity = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder billingStateCode(String value) {
+      this.billingStateCode = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder billingState(String value) {
+      this.billingState = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder billingZip(String value) {
+      this.billingZip = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerBuilder billingCountry(String value) {
+      this.billingCountry = value;
+      return this;
+    }
+
+    @Deprecated
+    public UpdateCardForCustomerBuilder ipAddress(String value) {
+      this.ipAddress = value;
+      return this;
+    }
+
+    @Deprecated
+    public UpdateCardForCustomerBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public UpdateCardForCustomerParams build() {
+      return new UpdateCardForCustomerParams(this);
+    }
+  }
+
+  public enum Gateway {
+    CHARGEBEE("chargebee"),
+
+    CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+    ADYEN("adyen"),
+
+    STRIPE("stripe"),
+
+    WEPAY("wepay"),
+
+    BRAINTREE("braintree"),
+
+    AUTHORIZE_NET("authorize_net"),
+
+    PAYPAL_PRO("paypal_pro"),
+
+    PIN("pin"),
+
+    EWAY("eway"),
+
+    EWAY_RAPID("eway_rapid"),
+
+    WORLDPAY("worldpay"),
+
+    BALANCED_PAYMENTS("balanced_payments"),
+
+    BEANSTREAM("beanstream"),
+
+    BLUEPAY("bluepay"),
+
+    ELAVON("elavon"),
+
+    FIRST_DATA_GLOBAL("first_data_global"),
+
+    HDFC("hdfc"),
+
+    MIGS("migs"),
+
+    NMI("nmi"),
+
+    OGONE("ogone"),
+
+    PAYMILL("paymill"),
+
+    PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+    SAGE_PAY("sage_pay"),
+
+    TCO("tco"),
+
+    WIRECARD("wirecard"),
+
+    AMAZON_PAYMENTS("amazon_payments"),
+
+    PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+    ORBITAL("orbital"),
+
+    MONERIS_US("moneris_us"),
+
+    MONERIS("moneris"),
+
+    BLUESNAP("bluesnap"),
+
+    CYBERSOURCE("cybersource"),
+
+    VANTIV("vantiv"),
+
+    CHECKOUT_COM("checkout_com"),
+
+    PAYPAL("paypal"),
+
+    INGENICO_DIRECT("ingenico_direct"),
+
+    EXACT("exact"),
+
+    MOLLIE("mollie"),
+
+    QUICKBOOKS("quickbooks"),
+
+    RAZORPAY("razorpay"),
+
+    GLOBAL_PAYMENTS("global_payments"),
+
+    BANK_OF_AMERICA("bank_of_america"),
+
+    ECENTRIC("ecentric"),
+
+    METRICS_GLOBAL("metrics_global"),
+
+    WINDCAVE("windcave"),
+
+    PAY_COM("pay_com"),
+
+    EBANX("ebanx"),
+
+    DLOCAL("dlocal"),
+
+    NUVEI("nuvei"),
+
+    SOLIDGATE("solidgate"),
+
+    PAYSTACK("paystack"),
+
+    JP_MORGAN("jp_morgan"),
+
+    DEUTSCHE_BANK("deutsche_bank"),
+
+    EZIDEBIT("ezidebit"),
+
+    /** An enum member indicating that Gateway was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Gateway(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Gateway fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Gateway enumValue : Gateway.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PreferredScheme {
+    CARTES_BANCAIRES("cartes_bancaires"),
+
+    MASTERCARD("mastercard"),
+
+    VISA("visa"),
+
+    /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PreferredScheme(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PreferredScheme fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PreferredScheme enumValue : PreferredScheme.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private CustomerBuilder() {}
+
+      @Deprecated
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/card/responses/CardRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/card/responses/CardRetrieveResponse.java
new file mode 100644
index 00000000..aa8d6f65
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/card/responses/CardRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.card.responses;
+
+import com.chargebee.v4.models.card.Card;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CardRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class CardRetrieveResponse extends BaseResponse {
+  private final Card card;
+
+  private CardRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.card = builder.card;
+  }
+
+  /** Parse JSON response into CardRetrieveResponse object. */
+  public static CardRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CardRetrieveResponse object with HTTP response. */
+  public static CardRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __cardJson = JsonUtil.getObject(json, "card");
+      if (__cardJson != null) {
+        builder.card(Card.fromJson(__cardJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CardRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CardRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CardRetrieveResponse. */
+  public static class Builder {
+
+    private Card card;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder card(Card card) {
+      this.card = card;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CardRetrieveResponse build() {
+      return new CardRetrieveResponse(this);
+    }
+  }
+
+  /** Get the card from the response. */
+  public Card getCard() {
+    return card;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/card/CardSwitchGatewayForCustomerResponse.java b/src/main/java/com/chargebee/v4/models/card/responses/CardSwitchGatewayForCustomerResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/card/CardSwitchGatewayForCustomerResponse.java
rename to src/main/java/com/chargebee/v4/models/card/responses/CardSwitchGatewayForCustomerResponse.java
index b8ee2da7..0d1a4006 100644
--- a/src/main/java/com/chargebee/v4/core/responses/card/CardSwitchGatewayForCustomerResponse.java
+++ b/src/main/java/com/chargebee/v4/models/card/responses/CardSwitchGatewayForCustomerResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.card;
+package com.chargebee.v4.models.card.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/card/responses/CopyCardForCustomerResponse.java b/src/main/java/com/chargebee/v4/models/card/responses/CopyCardForCustomerResponse.java
new file mode 100644
index 00000000..d4f243e6
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/card/responses/CopyCardForCustomerResponse.java
@@ -0,0 +1,78 @@
+package com.chargebee.v4.models.card.responses;
+
+import com.chargebee.v4.models.thirdPartyPaymentMethod.ThirdPartyPaymentMethod;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CopyCardForCustomer operation. Contains the response data from the
+ * API.
+ */
+public final class CopyCardForCustomerResponse extends BaseResponse {
+  private final ThirdPartyPaymentMethod thirdPartyPaymentMethod;
+
+  private CopyCardForCustomerResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.thirdPartyPaymentMethod = builder.thirdPartyPaymentMethod;
+  }
+
+  /** Parse JSON response into CopyCardForCustomerResponse object. */
+  public static CopyCardForCustomerResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CopyCardForCustomerResponse object with HTTP response. */
+  public static CopyCardForCustomerResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __thirdPartyPaymentMethodJson = JsonUtil.getObject(json, "third_party_payment_method");
+      if (__thirdPartyPaymentMethodJson != null) {
+        builder.thirdPartyPaymentMethod(
+            ThirdPartyPaymentMethod.fromJson(__thirdPartyPaymentMethodJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CopyCardForCustomerResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CopyCardForCustomerResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CopyCardForCustomerResponse. */
+  public static class Builder {
+
+    private ThirdPartyPaymentMethod thirdPartyPaymentMethod;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder thirdPartyPaymentMethod(ThirdPartyPaymentMethod thirdPartyPaymentMethod) {
+      this.thirdPartyPaymentMethod = thirdPartyPaymentMethod;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CopyCardForCustomerResponse build() {
+      return new CopyCardForCustomerResponse(this);
+    }
+  }
+
+  /** Get the thirdPartyPaymentMethod from the response. */
+  public ThirdPartyPaymentMethod getThirdPartyPaymentMethod() {
+    return thirdPartyPaymentMethod;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/card/responses/DeleteCardForCustomerResponse.java b/src/main/java/com/chargebee/v4/models/card/responses/DeleteCardForCustomerResponse.java
new file mode 100644
index 00000000..b13c0fa3
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/card/responses/DeleteCardForCustomerResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.card.responses;
+
+import com.chargebee.v4.models.customer.Customer;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for DeleteCardForCustomer operation. Contains the response data from
+ * the API.
+ */
+public final class DeleteCardForCustomerResponse extends BaseResponse {
+  private final Customer customer;
+
+  private DeleteCardForCustomerResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.customer = builder.customer;
+  }
+
+  /** Parse JSON response into DeleteCardForCustomerResponse object. */
+  public static DeleteCardForCustomerResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into DeleteCardForCustomerResponse object with HTTP response. */
+  public static DeleteCardForCustomerResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __customerJson = JsonUtil.getObject(json, "customer");
+      if (__customerJson != null) {
+        builder.customer(Customer.fromJson(__customerJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse DeleteCardForCustomerResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for DeleteCardForCustomerResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for DeleteCardForCustomerResponse. */
+  public static class Builder {
+
+    private Customer customer;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder customer(Customer customer) {
+      this.customer = customer;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public DeleteCardForCustomerResponse build() {
+      return new DeleteCardForCustomerResponse(this);
+    }
+  }
+
+  /** Get the customer from the response. */
+  public Customer getCustomer() {
+    return customer;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/card/responses/UpdateCardForCustomerResponse.java b/src/main/java/com/chargebee/v4/models/card/responses/UpdateCardForCustomerResponse.java
new file mode 100644
index 00000000..740131bd
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/card/responses/UpdateCardForCustomerResponse.java
@@ -0,0 +1,100 @@
+package com.chargebee.v4.models.card.responses;
+
+import com.chargebee.v4.models.customer.Customer;
+
+import com.chargebee.v4.models.card.Card;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for UpdateCardForCustomer operation. Contains the response data from
+ * the API.
+ */
+public final class UpdateCardForCustomerResponse extends BaseResponse {
+  private final Customer customer;
+
+  private final Card card;
+
+  private UpdateCardForCustomerResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+  }
+
+  /** Parse JSON response into UpdateCardForCustomerResponse object. */
+  public static UpdateCardForCustomerResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into UpdateCardForCustomerResponse object with HTTP response. */
+  public static UpdateCardForCustomerResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __customerJson = JsonUtil.getObject(json, "customer");
+      if (__customerJson != null) {
+        builder.customer(Customer.fromJson(__customerJson));
+      }
+
+      String __cardJson = JsonUtil.getObject(json, "card");
+      if (__cardJson != null) {
+        builder.card(Card.fromJson(__cardJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse UpdateCardForCustomerResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for UpdateCardForCustomerResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for UpdateCardForCustomerResponse. */
+  public static class Builder {
+
+    private Customer customer;
+
+    private Card card;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder customer(Customer customer) {
+      this.customer = customer;
+      return this;
+    }
+
+    public Builder card(Card card) {
+      this.card = card;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public UpdateCardForCustomerResponse build() {
+      return new UpdateCardForCustomerResponse(this);
+    }
+  }
+
+  /** Get the customer from the response. */
+  public Customer getCustomer() {
+    return customer;
+  }
+
+  /** Get the card from the response. */
+  public Card getCard() {
+    return card;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/comment/Comment.java b/src/main/java/com/chargebee/v4/models/comment/Comment.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/comment/Comment.java
rename to src/main/java/com/chargebee/v4/models/comment/Comment.java
index 1b68ea97..46f1ded4 100644
--- a/src/main/java/com/chargebee/v4/core/models/comment/Comment.java
+++ b/src/main/java/com/chargebee/v4/models/comment/Comment.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.comment;
+package com.chargebee.v4.models.comment;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/comment/params/CommentCreateParams.java b/src/main/java/com/chargebee/v4/models/comment/params/CommentCreateParams.java
new file mode 100644
index 00000000..d3edc856
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/comment/params/CommentCreateParams.java
@@ -0,0 +1,174 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.comment.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CommentCreateParams {
+
+  private final EntityType entityType;
+
+  private final String entityId;
+
+  private final String notes;
+
+  private final String addedBy;
+
+  private CommentCreateParams(CommentCreateBuilder builder) {
+
+    this.entityType = builder.entityType;
+
+    this.entityId = builder.entityId;
+
+    this.notes = builder.notes;
+
+    this.addedBy = builder.addedBy;
+  }
+
+  public EntityType getEntityType() {
+    return entityType;
+  }
+
+  public String getEntityId() {
+    return entityId;
+  }
+
+  public String getNotes() {
+    return notes;
+  }
+
+  public String getAddedBy() {
+    return addedBy;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.entityType != null) {
+
+      formData.put("entity_type", this.entityType);
+    }
+
+    if (this.entityId != null) {
+
+      formData.put("entity_id", this.entityId);
+    }
+
+    if (this.notes != null) {
+
+      formData.put("notes", this.notes);
+    }
+
+    if (this.addedBy != null) {
+
+      formData.put("added_by", this.addedBy);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CommentCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CommentCreateBuilder builder() {
+    return new CommentCreateBuilder();
+  }
+
+  public static final class CommentCreateBuilder {
+
+    private EntityType entityType;
+
+    private String entityId;
+
+    private String notes;
+
+    private String addedBy;
+
+    private CommentCreateBuilder() {}
+
+    public CommentCreateBuilder entityType(EntityType value) {
+      this.entityType = value;
+      return this;
+    }
+
+    public CommentCreateBuilder entityId(String value) {
+      this.entityId = value;
+      return this;
+    }
+
+    public CommentCreateBuilder notes(String value) {
+      this.notes = value;
+      return this;
+    }
+
+    public CommentCreateBuilder addedBy(String value) {
+      this.addedBy = value;
+      return this;
+    }
+
+    public CommentCreateParams build() {
+      return new CommentCreateParams(this);
+    }
+  }
+
+  public enum EntityType {
+    CUSTOMER("customer"),
+
+    SUBSCRIPTION("subscription"),
+
+    INVOICE("invoice"),
+
+    QUOTE("quote"),
+
+    CREDIT_NOTE("credit_note"),
+
+    TRANSACTION("transaction"),
+
+    PLAN("plan"),
+
+    ADDON("addon"),
+
+    COUPON("coupon"),
+
+    ORDER("order"),
+
+    BUSINESS_ENTITY("business_entity"),
+
+    ITEM_FAMILY("item_family"),
+
+    ITEM("item"),
+
+    ITEM_PRICE("item_price"),
+
+    PRICE_VARIANT("price_variant"),
+
+    /** An enum member indicating that EntityType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    EntityType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static EntityType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (EntityType enumValue : EntityType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/comment/params/CommentDeleteParams.java b/src/main/java/com/chargebee/v4/models/comment/params/CommentDeleteParams.java
new file mode 100644
index 00000000..5a9699c2
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/comment/params/CommentDeleteParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.comment.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CommentDeleteParams {
+
+  private CommentDeleteParams(CommentDeleteBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for CommentDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CommentDeleteBuilder builder() {
+    return new CommentDeleteBuilder();
+  }
+
+  public static final class CommentDeleteBuilder {
+
+    private CommentDeleteBuilder() {}
+
+    public CommentDeleteParams build() {
+      return new CommentDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/comment/params/CommentListParams.java b/src/main/java/com/chargebee/v4/models/comment/params/CommentListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/comment/params/CommentListParams.java
rename to src/main/java/com/chargebee/v4/models/comment/params/CommentListParams.java
index 3094fdc6..06261a3e 100644
--- a/src/main/java/com/chargebee/v4/core/models/comment/params/CommentListParams.java
+++ b/src/main/java/com/chargebee/v4/models/comment/params/CommentListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.comment.params;
+package com.chargebee.v4.models.comment.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/comment/params/CommentRetrieveParams.java b/src/main/java/com/chargebee/v4/models/comment/params/CommentRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/comment/params/CommentRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/comment/params/CommentRetrieveParams.java
index 2fc52107..92572cd1 100644
--- a/src/main/java/com/chargebee/v4/core/models/comment/params/CommentRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/comment/params/CommentRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.comment.params;
+package com.chargebee.v4.models.comment.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/comment/CommentCreateResponse.java b/src/main/java/com/chargebee/v4/models/comment/responses/CommentCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/comment/CommentCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/comment/responses/CommentCreateResponse.java
index 8ceabd36..229d3245 100644
--- a/src/main/java/com/chargebee/v4/core/responses/comment/CommentCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/comment/responses/CommentCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.comment;
+package com.chargebee.v4.models.comment.responses;
 
-import com.chargebee.v4.core.models.comment.Comment;
+import com.chargebee.v4.models.comment.Comment;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/comment/CommentDeleteResponse.java b/src/main/java/com/chargebee/v4/models/comment/responses/CommentDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/comment/CommentDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/comment/responses/CommentDeleteResponse.java
index 428d669c..1a3692d3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/comment/CommentDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/comment/responses/CommentDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.comment;
+package com.chargebee.v4.models.comment.responses;
 
-import com.chargebee.v4.core.models.comment.Comment;
+import com.chargebee.v4.models.comment.Comment;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/comment/CommentListResponse.java b/src/main/java/com/chargebee/v4/models/comment/responses/CommentListResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/comment/CommentListResponse.java
rename to src/main/java/com/chargebee/v4/models/comment/responses/CommentListResponse.java
index f3d616e9..2df463d7 100644
--- a/src/main/java/com/chargebee/v4/core/responses/comment/CommentListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/comment/responses/CommentListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.comment;
+package com.chargebee.v4.models.comment.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.comment.Comment;
+import com.chargebee.v4.models.comment.Comment;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.CommentService;
-import com.chargebee.v4.core.models.comment.params.CommentListParams;
+import com.chargebee.v4.services.CommentService;
+import com.chargebee.v4.models.comment.params.CommentListParams;
 
 /** Immutable response object for CommentList operation. Contains paginated list data. */
 public final class CommentListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public CommentListResponse nextPage() throws Exception {
+  public CommentListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/comment/responses/CommentRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/comment/responses/CommentRetrieveResponse.java
new file mode 100644
index 00000000..b9a0df8d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/comment/responses/CommentRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.comment.responses;
+
+import com.chargebee.v4.models.comment.Comment;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CommentRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class CommentRetrieveResponse extends BaseResponse {
+  private final Comment comment;
+
+  private CommentRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.comment = builder.comment;
+  }
+
+  /** Parse JSON response into CommentRetrieveResponse object. */
+  public static CommentRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CommentRetrieveResponse object with HTTP response. */
+  public static CommentRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __commentJson = JsonUtil.getObject(json, "comment");
+      if (__commentJson != null) {
+        builder.comment(Comment.fromJson(__commentJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CommentRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CommentRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CommentRetrieveResponse. */
+  public static class Builder {
+
+    private Comment comment;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder comment(Comment comment) {
+      this.comment = comment;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CommentRetrieveResponse build() {
+      return new CommentRetrieveResponse(this);
+    }
+  }
+
+  /** Get the comment from the response. */
+  public Comment getComment() {
+    return comment;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/configuration/Configuration.java b/src/main/java/com/chargebee/v4/models/configuration/Configuration.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/configuration/Configuration.java
rename to src/main/java/com/chargebee/v4/models/configuration/Configuration.java
index b3ba1a85..98e0b22d 100644
--- a/src/main/java/com/chargebee/v4/core/models/configuration/Configuration.java
+++ b/src/main/java/com/chargebee/v4/models/configuration/Configuration.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.configuration;
+package com.chargebee.v4.models.configuration;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/configuration/params/ConfigurationListParams.java b/src/main/java/com/chargebee/v4/models/configuration/params/ConfigurationListParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/configuration/params/ConfigurationListParams.java
rename to src/main/java/com/chargebee/v4/models/configuration/params/ConfigurationListParams.java
index 6f923a10..a036accc 100644
--- a/src/main/java/com/chargebee/v4/core/models/configuration/params/ConfigurationListParams.java
+++ b/src/main/java/com/chargebee/v4/models/configuration/params/ConfigurationListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.configuration.params;
+package com.chargebee.v4.models.configuration.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/configuration/responses/ConfigurationListResponse.java b/src/main/java/com/chargebee/v4/models/configuration/responses/ConfigurationListResponse.java
new file mode 100644
index 00000000..b10b121f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/configuration/responses/ConfigurationListResponse.java
@@ -0,0 +1,81 @@
+package com.chargebee.v4.models.configuration.responses;
+
+import com.chargebee.v4.models.configuration.Configuration;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import java.util.List;
+
+/**
+ * Immutable response object for ConfigurationList operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class ConfigurationListResponse extends BaseResponse {
+  private final List<Configuration> configurations;
+
+  private ConfigurationListResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.configurations = builder.configurations;
+  }
+
+  /** Parse JSON response into ConfigurationListResponse object. */
+  public static ConfigurationListResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ConfigurationListResponse object with HTTP response. */
+  public static ConfigurationListResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __configurationsJson = JsonUtil.getArray(json, "configurations");
+      if (__configurationsJson != null) {
+        builder.configurations(
+            JsonUtil.parseObjectArray(__configurationsJson).stream()
+                .map(Configuration::fromJson)
+                .collect(java.util.stream.Collectors.toList()));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ConfigurationListResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ConfigurationListResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ConfigurationListResponse. */
+  public static class Builder {
+
+    private List<Configuration> configurations;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder configurations(List<Configuration> configurations) {
+      this.configurations = configurations;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ConfigurationListResponse build() {
+      return new ConfigurationListResponse(this);
+    }
+  }
+
+  /** Get the configurations from the response. */
+  public List<Configuration> getConfigurations() {
+    return configurations;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/contact/Contact.java b/src/main/java/com/chargebee/v4/models/contact/Contact.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/contact/Contact.java
rename to src/main/java/com/chargebee/v4/models/contact/Contact.java
index 714fedea..ab1102f8 100644
--- a/src/main/java/com/chargebee/v4/core/models/contact/Contact.java
+++ b/src/main/java/com/chargebee/v4/models/contact/Contact.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.contact;
+package com.chargebee.v4.models.contact;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/contractTerm/ContractTerm.java b/src/main/java/com/chargebee/v4/models/contractTerm/ContractTerm.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/contractTerm/ContractTerm.java
rename to src/main/java/com/chargebee/v4/models/contractTerm/ContractTerm.java
index 06b70024..34d08fde 100644
--- a/src/main/java/com/chargebee/v4/core/models/contractTerm/ContractTerm.java
+++ b/src/main/java/com/chargebee/v4/models/contractTerm/ContractTerm.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.contractTerm;
+package com.chargebee.v4.models.contractTerm;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/coupon/Coupon.java b/src/main/java/com/chargebee/v4/models/coupon/Coupon.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/coupon/Coupon.java
rename to src/main/java/com/chargebee/v4/models/coupon/Coupon.java
index b04e82fa..a1304717 100644
--- a/src/main/java/com/chargebee/v4/core/models/coupon/Coupon.java
+++ b/src/main/java/com/chargebee/v4/models/coupon/Coupon.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.coupon;
+package com.chargebee.v4.models.coupon;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -48,7 +48,7 @@ public class Coupon {
   private Boolean includedInMrr;
   private List<String> addonIds;
 
-  private java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+  private java.util.Map<String, String> customFields = new java.util.HashMap<>();
 
   public String getId() {
     return id;
@@ -194,7 +194,7 @@ public List<String> getAddonIds() {
    *
    * @return map containing all custom fields
    */
-  public java.util.Map<String, Object> getCustomFields() {
+  public java.util.Map<String, String> getCustomFields() {
     return customFields;
   }
 
@@ -204,7 +204,7 @@ public java.util.Map<String, Object> getCustomFields() {
    * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
    * @return the value of the custom field, or null if not present
    */
-  public Object getCustomField(String fieldName) {
+  public String getCustomField(String fieldName) {
     return customFields.get(fieldName);
   }
 
@@ -465,7 +465,7 @@ public static PlanConstraint fromString(String value) {
   public static Coupon fromJson(String json) {
     Coupon obj = new Coupon();
 
-    // Parse JSON to extract all keys
+    // Parse JSON to extract all keys for custom field extraction
     java.util.Set<String> knownFields = new java.util.HashSet<>();
 
     knownFields.add("id");
@@ -631,9 +631,9 @@ public static Coupon fromJson(String json) {
    * @param knownFields set of known field names
    * @return map of custom fields
    */
-  private static java.util.Map<String, Object> extractCustomFields(
+  private static java.util.Map<String, String> extractCustomFields(
       String json, java.util.Set<String> knownFields) {
-    java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+    java.util.Map<String, String> customFields = new java.util.HashMap<>();
     try {
       // Parse the entire JSON as a map
       java.util.Map<String, Object> allFields = JsonUtil.parseJsonObjectToMap(json);
@@ -642,7 +642,8 @@ private static java.util.Map<String, Object> extractCustomFields(
           String key = entry.getKey();
           // Include fields that start with "cf_" and are not in knownFields
           if (key != null && key.startsWith("cf_") && !knownFields.contains(key)) {
-            customFields.put(key, entry.getValue());
+            customFields.put(
+                key, entry.getValue() != null ? String.valueOf(entry.getValue()) : null);
           }
         }
       }
diff --git a/src/main/java/com/chargebee/v4/models/coupon/params/CouponCopyParams.java b/src/main/java/com/chargebee/v4/models/coupon/params/CouponCopyParams.java
new file mode 100644
index 00000000..90eb5f6e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/coupon/params/CouponCopyParams.java
@@ -0,0 +1,120 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.coupon.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CouponCopyParams {
+
+  private final String fromSite;
+
+  private final String idAtFromSite;
+
+  private final String id;
+
+  private final Boolean forSiteMerging;
+
+  private CouponCopyParams(CouponCopyBuilder builder) {
+
+    this.fromSite = builder.fromSite;
+
+    this.idAtFromSite = builder.idAtFromSite;
+
+    this.id = builder.id;
+
+    this.forSiteMerging = builder.forSiteMerging;
+  }
+
+  public String getFromSite() {
+    return fromSite;
+  }
+
+  public String getIdAtFromSite() {
+    return idAtFromSite;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public Boolean getForSiteMerging() {
+    return forSiteMerging;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.fromSite != null) {
+
+      formData.put("from_site", this.fromSite);
+    }
+
+    if (this.idAtFromSite != null) {
+
+      formData.put("id_at_from_site", this.idAtFromSite);
+    }
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.forSiteMerging != null) {
+
+      formData.put("for_site_merging", this.forSiteMerging);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CouponCopyParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CouponCopyBuilder builder() {
+    return new CouponCopyBuilder();
+  }
+
+  public static final class CouponCopyBuilder {
+
+    private String fromSite;
+
+    private String idAtFromSite;
+
+    private String id;
+
+    private Boolean forSiteMerging;
+
+    private CouponCopyBuilder() {}
+
+    public CouponCopyBuilder fromSite(String value) {
+      this.fromSite = value;
+      return this;
+    }
+
+    public CouponCopyBuilder idAtFromSite(String value) {
+      this.idAtFromSite = value;
+      return this;
+    }
+
+    public CouponCopyBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public CouponCopyBuilder forSiteMerging(Boolean value) {
+      this.forSiteMerging = value;
+      return this;
+    }
+
+    public CouponCopyParams build() {
+      return new CouponCopyParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/coupon/params/CouponCreateForItemsParams.java b/src/main/java/com/chargebee/v4/models/coupon/params/CouponCreateForItemsParams.java
new file mode 100644
index 00000000..f3bf1963
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/coupon/params/CouponCreateForItemsParams.java
@@ -0,0 +1,1172 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.coupon.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class CouponCreateForItemsParams {
+
+  private final String id;
+
+  private final String name;
+
+  private final String invoiceName;
+
+  private final DiscountType discountType;
+
+  private final Long discountAmount;
+
+  private final String currencyCode;
+
+  private final Number discountPercentage;
+
+  private final Integer discountQuantity;
+
+  private final ApplyOn applyOn;
+
+  private final DurationType durationType;
+
+  private final Integer durationMonth;
+
+  private final Timestamp validFrom;
+
+  private final Timestamp validTill;
+
+  private final Integer maxRedemptions;
+
+  private final String invoiceNotes;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final Boolean includedInMrr;
+
+  private final Integer period;
+
+  private final PeriodUnit periodUnit;
+
+  private final Status status;
+
+  private final List<ItemConstraintsParams> itemConstraints;
+
+  private final List<ItemConstraintCriteriaParams> itemConstraintCriteria;
+
+  private final List<CouponConstraintsParams> couponConstraints;
+
+  private final Map<String, String> customFields;
+
+  private CouponCreateForItemsParams(CouponCreateForItemsBuilder builder) {
+
+    this.id = builder.id;
+
+    this.name = builder.name;
+
+    this.invoiceName = builder.invoiceName;
+
+    this.discountType = builder.discountType;
+
+    this.discountAmount = builder.discountAmount;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.discountPercentage = builder.discountPercentage;
+
+    this.discountQuantity = builder.discountQuantity;
+
+    this.applyOn = builder.applyOn;
+
+    this.durationType = builder.durationType;
+
+    this.durationMonth = builder.durationMonth;
+
+    this.validFrom = builder.validFrom;
+
+    this.validTill = builder.validTill;
+
+    this.maxRedemptions = builder.maxRedemptions;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.metaData = builder.metaData;
+
+    this.includedInMrr = builder.includedInMrr;
+
+    this.period = builder.period;
+
+    this.periodUnit = builder.periodUnit;
+
+    this.status = builder.status;
+
+    this.itemConstraints = builder.itemConstraints;
+
+    this.itemConstraintCriteria = builder.itemConstraintCriteria;
+
+    this.couponConstraints = builder.couponConstraints;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getInvoiceName() {
+    return invoiceName;
+  }
+
+  public DiscountType getDiscountType() {
+    return discountType;
+  }
+
+  public Long getDiscountAmount() {
+    return discountAmount;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public Number getDiscountPercentage() {
+    return discountPercentage;
+  }
+
+  public Integer getDiscountQuantity() {
+    return discountQuantity;
+  }
+
+  public ApplyOn getApplyOn() {
+    return applyOn;
+  }
+
+  public DurationType getDurationType() {
+    return durationType;
+  }
+
+  public Integer getDurationMonth() {
+    return durationMonth;
+  }
+
+  public Timestamp getValidFrom() {
+    return validFrom;
+  }
+
+  public Timestamp getValidTill() {
+    return validTill;
+  }
+
+  public Integer getMaxRedemptions() {
+    return maxRedemptions;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public Boolean getIncludedInMrr() {
+    return includedInMrr;
+  }
+
+  public Integer getPeriod() {
+    return period;
+  }
+
+  public PeriodUnit getPeriodUnit() {
+    return periodUnit;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public List<ItemConstraintsParams> getItemConstraints() {
+    return itemConstraints;
+  }
+
+  public List<ItemConstraintCriteriaParams> getItemConstraintCriteria() {
+    return itemConstraintCriteria;
+  }
+
+  public List<CouponConstraintsParams> getCouponConstraints() {
+    return couponConstraints;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.invoiceName != null) {
+
+      formData.put("invoice_name", this.invoiceName);
+    }
+
+    if (this.discountType != null) {
+
+      formData.put("discount_type", this.discountType);
+    }
+
+    if (this.discountAmount != null) {
+
+      formData.put("discount_amount", this.discountAmount);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.discountPercentage != null) {
+
+      formData.put("discount_percentage", this.discountPercentage);
+    }
+
+    if (this.discountQuantity != null) {
+
+      formData.put("discount_quantity", this.discountQuantity);
+    }
+
+    if (this.applyOn != null) {
+
+      formData.put("apply_on", this.applyOn);
+    }
+
+    if (this.durationType != null) {
+
+      formData.put("duration_type", this.durationType);
+    }
+
+    if (this.durationMonth != null) {
+
+      formData.put("duration_month", this.durationMonth);
+    }
+
+    if (this.validFrom != null) {
+
+      formData.put("valid_from", this.validFrom);
+    }
+
+    if (this.validTill != null) {
+
+      formData.put("valid_till", this.validTill);
+    }
+
+    if (this.maxRedemptions != null) {
+
+      formData.put("max_redemptions", this.maxRedemptions);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.includedInMrr != null) {
+
+      formData.put("included_in_mrr", this.includedInMrr);
+    }
+
+    if (this.period != null) {
+
+      formData.put("period", this.period);
+    }
+
+    if (this.periodUnit != null) {
+
+      formData.put("period_unit", this.periodUnit);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.itemConstraints != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemConstraints.size(); i++) {
+        ItemConstraintsParams item = this.itemConstraints.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_constraints[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemConstraintCriteria != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemConstraintCriteria.size(); i++) {
+        ItemConstraintCriteriaParams item = this.itemConstraintCriteria.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_constraint_criteria[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.couponConstraints != null) {
+
+      // List of objects
+      for (int i = 0; i < this.couponConstraints.size(); i++) {
+        CouponConstraintsParams item = this.couponConstraints.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupon_constraints[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CouponCreateForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CouponCreateForItemsBuilder builder() {
+    return new CouponCreateForItemsBuilder();
+  }
+
+  public static final class CouponCreateForItemsBuilder {
+
+    private String id;
+
+    private String name;
+
+    private String invoiceName;
+
+    private DiscountType discountType;
+
+    private Long discountAmount;
+
+    private String currencyCode;
+
+    private Number discountPercentage;
+
+    private Integer discountQuantity;
+
+    private ApplyOn applyOn;
+
+    private DurationType durationType;
+
+    private Integer durationMonth;
+
+    private Timestamp validFrom;
+
+    private Timestamp validTill;
+
+    private Integer maxRedemptions;
+
+    private String invoiceNotes;
+
+    private java.util.Map<String, Object> metaData;
+
+    private Boolean includedInMrr;
+
+    private Integer period;
+
+    private PeriodUnit periodUnit;
+
+    private Status status;
+
+    private List<ItemConstraintsParams> itemConstraints;
+
+    private List<ItemConstraintCriteriaParams> itemConstraintCriteria;
+
+    private List<CouponConstraintsParams> couponConstraints;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private CouponCreateForItemsBuilder() {}
+
+    public CouponCreateForItemsBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder invoiceName(String value) {
+      this.invoiceName = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder discountType(DiscountType value) {
+      this.discountType = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder discountAmount(Long value) {
+      this.discountAmount = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder discountPercentage(Number value) {
+      this.discountPercentage = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder discountQuantity(Integer value) {
+      this.discountQuantity = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder applyOn(ApplyOn value) {
+      this.applyOn = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder durationType(DurationType value) {
+      this.durationType = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder durationMonth(Integer value) {
+      this.durationMonth = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder validFrom(Timestamp value) {
+      this.validFrom = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder validTill(Timestamp value) {
+      this.validTill = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder maxRedemptions(Integer value) {
+      this.maxRedemptions = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder includedInMrr(Boolean value) {
+      this.includedInMrr = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder period(Integer value) {
+      this.period = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder periodUnit(PeriodUnit value) {
+      this.periodUnit = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder itemConstraints(List<ItemConstraintsParams> value) {
+      this.itemConstraints = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder itemConstraintCriteria(
+        List<ItemConstraintCriteriaParams> value) {
+      this.itemConstraintCriteria = value;
+      return this;
+    }
+
+    public CouponCreateForItemsBuilder couponConstraints(List<CouponConstraintsParams> value) {
+      this.couponConstraints = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public CouponCreateForItemsBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public CouponCreateForItemsBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CouponCreateForItemsParams build() {
+      return new CouponCreateForItemsParams(this);
+    }
+  }
+
+  public enum DiscountType {
+    FIXED_AMOUNT("fixed_amount"),
+
+    PERCENTAGE("percentage"),
+
+    OFFER_QUANTITY("offer_quantity"),
+
+    /** An enum member indicating that DiscountType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    DiscountType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static DiscountType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (DiscountType enumValue : DiscountType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ApplyOn {
+    INVOICE_AMOUNT("invoice_amount"),
+
+    SPECIFIED_ITEMS_TOTAL("specified_items_total"),
+
+    EACH_SPECIFIED_ITEM("each_specified_item"),
+
+    EACH_UNIT_OF_SPECIFIED_ITEMS("each_unit_of_specified_items"),
+
+    /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ApplyOn(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ApplyOn fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ApplyOn enumValue : ApplyOn.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum DurationType {
+    ONE_TIME("one_time"),
+
+    FOREVER("forever"),
+
+    LIMITED_PERIOD("limited_period"),
+
+    /** An enum member indicating that DurationType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    DurationType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static DurationType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (DurationType enumValue : DurationType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PeriodUnit enumValue : PeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Status {
+    ACTIVE("active"),
+
+    ARCHIVED("archived"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ItemConstraintsParams {
+
+    private final Constraint constraint;
+
+    private final ItemType itemType;
+
+    private final List<Object> itemPriceIds;
+
+    private ItemConstraintsParams(ItemConstraintsBuilder builder) {
+
+      this.constraint = builder.constraint;
+
+      this.itemType = builder.itemType;
+
+      this.itemPriceIds = builder.itemPriceIds;
+    }
+
+    public Constraint getConstraint() {
+      return constraint;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public List<Object> getItemPriceIds() {
+      return itemPriceIds;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.constraint != null) {
+
+        formData.put("constraint", this.constraint);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.itemPriceIds != null) {
+
+        formData.put("item_price_ids", JsonUtil.toJson(this.itemPriceIds));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemConstraintsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemConstraintsBuilder builder() {
+      return new ItemConstraintsBuilder();
+    }
+
+    public static final class ItemConstraintsBuilder {
+
+      private Constraint constraint;
+
+      private ItemType itemType;
+
+      private List<Object> itemPriceIds;
+
+      private ItemConstraintsBuilder() {}
+
+      public ItemConstraintsBuilder constraint(Constraint value) {
+        this.constraint = value;
+        return this;
+      }
+
+      public ItemConstraintsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public ItemConstraintsBuilder itemPriceIds(List<Object> value) {
+        this.itemPriceIds = value;
+        return this;
+      }
+
+      public ItemConstraintsParams build() {
+        return new ItemConstraintsParams(this);
+      }
+    }
+
+    public enum Constraint {
+      NONE("none"),
+
+      ALL("all"),
+
+      SPECIFIC("specific"),
+
+      CRITERIA("criteria"),
+
+      /** An enum member indicating that Constraint was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Constraint(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Constraint fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Constraint enumValue : Constraint.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemConstraintCriteriaParams {
+
+    private final ItemType itemType;
+
+    private final List<Object> itemFamilyIds;
+
+    private final List<Object> currencies;
+
+    private final List<Object> itemPricePeriods;
+
+    private ItemConstraintCriteriaParams(ItemConstraintCriteriaBuilder builder) {
+
+      this.itemType = builder.itemType;
+
+      this.itemFamilyIds = builder.itemFamilyIds;
+
+      this.currencies = builder.currencies;
+
+      this.itemPricePeriods = builder.itemPricePeriods;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public List<Object> getItemFamilyIds() {
+      return itemFamilyIds;
+    }
+
+    public List<Object> getCurrencies() {
+      return currencies;
+    }
+
+    public List<Object> getItemPricePeriods() {
+      return itemPricePeriods;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.itemFamilyIds != null) {
+
+        formData.put("item_family_ids", JsonUtil.toJson(this.itemFamilyIds));
+      }
+
+      if (this.currencies != null) {
+
+        formData.put("currencies", JsonUtil.toJson(this.currencies));
+      }
+
+      if (this.itemPricePeriods != null) {
+
+        formData.put("item_price_periods", JsonUtil.toJson(this.itemPricePeriods));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemConstraintCriteriaParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemConstraintCriteriaBuilder builder() {
+      return new ItemConstraintCriteriaBuilder();
+    }
+
+    public static final class ItemConstraintCriteriaBuilder {
+
+      private ItemType itemType;
+
+      private List<Object> itemFamilyIds;
+
+      private List<Object> currencies;
+
+      private List<Object> itemPricePeriods;
+
+      private ItemConstraintCriteriaBuilder() {}
+
+      public ItemConstraintCriteriaBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public ItemConstraintCriteriaBuilder itemFamilyIds(List<Object> value) {
+        this.itemFamilyIds = value;
+        return this;
+      }
+
+      public ItemConstraintCriteriaBuilder currencies(List<Object> value) {
+        this.currencies = value;
+        return this;
+      }
+
+      public ItemConstraintCriteriaBuilder itemPricePeriods(List<Object> value) {
+        this.itemPricePeriods = value;
+        return this;
+      }
+
+      public ItemConstraintCriteriaParams build() {
+        return new ItemConstraintCriteriaParams(this);
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponConstraintsParams {
+
+    private final EntityType entityType;
+
+    private final Type type;
+
+    private final String value;
+
+    private CouponConstraintsParams(CouponConstraintsBuilder builder) {
+
+      this.entityType = builder.entityType;
+
+      this.type = builder.type;
+
+      this.value = builder.value;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponConstraintsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponConstraintsBuilder builder() {
+      return new CouponConstraintsBuilder();
+    }
+
+    public static final class CouponConstraintsBuilder {
+
+      private EntityType entityType;
+
+      private Type type;
+
+      private String value;
+
+      private CouponConstraintsBuilder() {}
+
+      public CouponConstraintsBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public CouponConstraintsBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      public CouponConstraintsBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public CouponConstraintsParams build() {
+        return new CouponConstraintsParams(this);
+      }
+    }
+
+    public enum EntityType {
+      CUSTOMER("customer"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum Type {
+      MAX_REDEMPTIONS("max_redemptions"),
+
+      UNIQUE_BY("unique_by"),
+
+      EXISTING_CUSTOMER("existing_customer"),
+
+      NEW_CUSTOMER("new_customer"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/coupon/params/CouponCreateParams.java b/src/main/java/com/chargebee/v4/models/coupon/params/CouponCreateParams.java
new file mode 100644
index 00000000..8ef6bb0a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/coupon/params/CouponCreateParams.java
@@ -0,0 +1,715 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.coupon.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class CouponCreateParams {
+
+  private final String id;
+
+  private final String name;
+
+  private final String invoiceName;
+
+  private final DiscountType discountType;
+
+  private final Long discountAmount;
+
+  private final String currencyCode;
+
+  private final Number discountPercentage;
+
+  private final Integer discountQuantity;
+
+  private final ApplyOn applyOn;
+
+  private final DurationType durationType;
+
+  private final Integer durationMonth;
+
+  private final Timestamp validTill;
+
+  private final Integer maxRedemptions;
+
+  private final String invoiceNotes;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final Boolean includedInMrr;
+
+  private final Integer period;
+
+  private final PeriodUnit periodUnit;
+
+  private final PlanConstraint planConstraint;
+
+  private final AddonConstraint addonConstraint;
+
+  private final List<String> planIds;
+
+  private final List<String> addonIds;
+
+  private final Status status;
+
+  private CouponCreateParams(CouponCreateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.name = builder.name;
+
+    this.invoiceName = builder.invoiceName;
+
+    this.discountType = builder.discountType;
+
+    this.discountAmount = builder.discountAmount;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.discountPercentage = builder.discountPercentage;
+
+    this.discountQuantity = builder.discountQuantity;
+
+    this.applyOn = builder.applyOn;
+
+    this.durationType = builder.durationType;
+
+    this.durationMonth = builder.durationMonth;
+
+    this.validTill = builder.validTill;
+
+    this.maxRedemptions = builder.maxRedemptions;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.metaData = builder.metaData;
+
+    this.includedInMrr = builder.includedInMrr;
+
+    this.period = builder.period;
+
+    this.periodUnit = builder.periodUnit;
+
+    this.planConstraint = builder.planConstraint;
+
+    this.addonConstraint = builder.addonConstraint;
+
+    this.planIds = builder.planIds;
+
+    this.addonIds = builder.addonIds;
+
+    this.status = builder.status;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getInvoiceName() {
+    return invoiceName;
+  }
+
+  public DiscountType getDiscountType() {
+    return discountType;
+  }
+
+  public Long getDiscountAmount() {
+    return discountAmount;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public Number getDiscountPercentage() {
+    return discountPercentage;
+  }
+
+  public Integer getDiscountQuantity() {
+    return discountQuantity;
+  }
+
+  public ApplyOn getApplyOn() {
+    return applyOn;
+  }
+
+  public DurationType getDurationType() {
+    return durationType;
+  }
+
+  public Integer getDurationMonth() {
+    return durationMonth;
+  }
+
+  public Timestamp getValidTill() {
+    return validTill;
+  }
+
+  public Integer getMaxRedemptions() {
+    return maxRedemptions;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public Boolean getIncludedInMrr() {
+    return includedInMrr;
+  }
+
+  public Integer getPeriod() {
+    return period;
+  }
+
+  public PeriodUnit getPeriodUnit() {
+    return periodUnit;
+  }
+
+  public PlanConstraint getPlanConstraint() {
+    return planConstraint;
+  }
+
+  public AddonConstraint getAddonConstraint() {
+    return addonConstraint;
+  }
+
+  public List<String> getPlanIds() {
+    return planIds;
+  }
+
+  public List<String> getAddonIds() {
+    return addonIds;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.invoiceName != null) {
+
+      formData.put("invoice_name", this.invoiceName);
+    }
+
+    if (this.discountType != null) {
+
+      formData.put("discount_type", this.discountType);
+    }
+
+    if (this.discountAmount != null) {
+
+      formData.put("discount_amount", this.discountAmount);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.discountPercentage != null) {
+
+      formData.put("discount_percentage", this.discountPercentage);
+    }
+
+    if (this.discountQuantity != null) {
+
+      formData.put("discount_quantity", this.discountQuantity);
+    }
+
+    if (this.applyOn != null) {
+
+      formData.put("apply_on", this.applyOn);
+    }
+
+    if (this.durationType != null) {
+
+      formData.put("duration_type", this.durationType);
+    }
+
+    if (this.durationMonth != null) {
+
+      formData.put("duration_month", this.durationMonth);
+    }
+
+    if (this.validTill != null) {
+
+      formData.put("valid_till", this.validTill);
+    }
+
+    if (this.maxRedemptions != null) {
+
+      formData.put("max_redemptions", this.maxRedemptions);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.includedInMrr != null) {
+
+      formData.put("included_in_mrr", this.includedInMrr);
+    }
+
+    if (this.period != null) {
+
+      formData.put("period", this.period);
+    }
+
+    if (this.periodUnit != null) {
+
+      formData.put("period_unit", this.periodUnit);
+    }
+
+    if (this.planConstraint != null) {
+
+      formData.put("plan_constraint", this.planConstraint);
+    }
+
+    if (this.addonConstraint != null) {
+
+      formData.put("addon_constraint", this.addonConstraint);
+    }
+
+    if (this.planIds != null) {
+
+      formData.put("plan_ids", this.planIds);
+    }
+
+    if (this.addonIds != null) {
+
+      formData.put("addon_ids", this.addonIds);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CouponCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CouponCreateBuilder builder() {
+    return new CouponCreateBuilder();
+  }
+
+  public static final class CouponCreateBuilder {
+
+    private String id;
+
+    private String name;
+
+    private String invoiceName;
+
+    private DiscountType discountType;
+
+    private Long discountAmount;
+
+    private String currencyCode;
+
+    private Number discountPercentage;
+
+    private Integer discountQuantity;
+
+    private ApplyOn applyOn;
+
+    private DurationType durationType;
+
+    private Integer durationMonth;
+
+    private Timestamp validTill;
+
+    private Integer maxRedemptions;
+
+    private String invoiceNotes;
+
+    private java.util.Map<String, Object> metaData;
+
+    private Boolean includedInMrr;
+
+    private Integer period;
+
+    private PeriodUnit periodUnit;
+
+    private PlanConstraint planConstraint;
+
+    private AddonConstraint addonConstraint;
+
+    private List<String> planIds;
+
+    private List<String> addonIds;
+
+    private Status status;
+
+    private CouponCreateBuilder() {}
+
+    public CouponCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public CouponCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public CouponCreateBuilder invoiceName(String value) {
+      this.invoiceName = value;
+      return this;
+    }
+
+    public CouponCreateBuilder discountType(DiscountType value) {
+      this.discountType = value;
+      return this;
+    }
+
+    public CouponCreateBuilder discountAmount(Long value) {
+      this.discountAmount = value;
+      return this;
+    }
+
+    public CouponCreateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public CouponCreateBuilder discountPercentage(Number value) {
+      this.discountPercentage = value;
+      return this;
+    }
+
+    public CouponCreateBuilder discountQuantity(Integer value) {
+      this.discountQuantity = value;
+      return this;
+    }
+
+    public CouponCreateBuilder applyOn(ApplyOn value) {
+      this.applyOn = value;
+      return this;
+    }
+
+    public CouponCreateBuilder durationType(DurationType value) {
+      this.durationType = value;
+      return this;
+    }
+
+    public CouponCreateBuilder durationMonth(Integer value) {
+      this.durationMonth = value;
+      return this;
+    }
+
+    public CouponCreateBuilder validTill(Timestamp value) {
+      this.validTill = value;
+      return this;
+    }
+
+    public CouponCreateBuilder maxRedemptions(Integer value) {
+      this.maxRedemptions = value;
+      return this;
+    }
+
+    public CouponCreateBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public CouponCreateBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public CouponCreateBuilder includedInMrr(Boolean value) {
+      this.includedInMrr = value;
+      return this;
+    }
+
+    public CouponCreateBuilder period(Integer value) {
+      this.period = value;
+      return this;
+    }
+
+    public CouponCreateBuilder periodUnit(PeriodUnit value) {
+      this.periodUnit = value;
+      return this;
+    }
+
+    public CouponCreateBuilder planConstraint(PlanConstraint value) {
+      this.planConstraint = value;
+      return this;
+    }
+
+    public CouponCreateBuilder addonConstraint(AddonConstraint value) {
+      this.addonConstraint = value;
+      return this;
+    }
+
+    public CouponCreateBuilder planIds(List<String> value) {
+      this.planIds = value;
+      return this;
+    }
+
+    public CouponCreateBuilder addonIds(List<String> value) {
+      this.addonIds = value;
+      return this;
+    }
+
+    public CouponCreateBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public CouponCreateParams build() {
+      return new CouponCreateParams(this);
+    }
+  }
+
+  public enum DiscountType {
+    FIXED_AMOUNT("fixed_amount"),
+
+    PERCENTAGE("percentage"),
+
+    OFFER_QUANTITY("offer_quantity"),
+
+    /** An enum member indicating that DiscountType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    DiscountType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static DiscountType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (DiscountType enumValue : DiscountType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ApplyOn {
+    INVOICE_AMOUNT("invoice_amount"),
+
+    SPECIFIED_ITEMS_TOTAL("specified_items_total"),
+
+    EACH_SPECIFIED_ITEM("each_specified_item"),
+
+    EACH_UNIT_OF_SPECIFIED_ITEMS("each_unit_of_specified_items"),
+
+    /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ApplyOn(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ApplyOn fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ApplyOn enumValue : ApplyOn.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum DurationType {
+    ONE_TIME("one_time"),
+
+    FOREVER("forever"),
+
+    LIMITED_PERIOD("limited_period"),
+
+    /** An enum member indicating that DurationType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    DurationType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static DurationType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (DurationType enumValue : DurationType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PeriodUnit enumValue : PeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PlanConstraint {
+    NONE("none"),
+
+    ALL("all"),
+
+    SPECIFIC("specific"),
+
+    /** An enum member indicating that PlanConstraint was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PlanConstraint(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PlanConstraint fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PlanConstraint enumValue : PlanConstraint.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AddonConstraint {
+    NONE("none"),
+
+    ALL("all"),
+
+    SPECIFIC("specific"),
+
+    /** An enum member indicating that AddonConstraint was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AddonConstraint(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AddonConstraint fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AddonConstraint enumValue : AddonConstraint.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Status {
+    ACTIVE("active"),
+
+    ARCHIVED("archived"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/coupon/params/CouponDeleteParams.java b/src/main/java/com/chargebee/v4/models/coupon/params/CouponDeleteParams.java
new file mode 100644
index 00000000..59b03b04
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/coupon/params/CouponDeleteParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.coupon.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CouponDeleteParams {
+
+  private CouponDeleteParams(CouponDeleteBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for CouponDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CouponDeleteBuilder builder() {
+    return new CouponDeleteBuilder();
+  }
+
+  public static final class CouponDeleteBuilder {
+
+    private CouponDeleteBuilder() {}
+
+    public CouponDeleteParams build() {
+      return new CouponDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponListParams.java b/src/main/java/com/chargebee/v4/models/coupon/params/CouponListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/coupon/params/CouponListParams.java
rename to src/main/java/com/chargebee/v4/models/coupon/params/CouponListParams.java
index 5865da85..0fa17b94 100644
--- a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponListParams.java
+++ b/src/main/java/com/chargebee/v4/models/coupon/params/CouponListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.coupon.params;
+package com.chargebee.v4.models.coupon.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponRetrieveParams.java b/src/main/java/com/chargebee/v4/models/coupon/params/CouponRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/coupon/params/CouponRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/coupon/params/CouponRetrieveParams.java
index 3637801d..06356d58 100644
--- a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/coupon/params/CouponRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.coupon.params;
+package com.chargebee.v4.models.coupon.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponUnarchiveParams.java b/src/main/java/com/chargebee/v4/models/coupon/params/CouponUnarchiveParams.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/models/coupon/params/CouponUnarchiveParams.java
rename to src/main/java/com/chargebee/v4/models/coupon/params/CouponUnarchiveParams.java
index 05560859..9a7586ab 100644
--- a/src/main/java/com/chargebee/v4/core/models/coupon/params/CouponUnarchiveParams.java
+++ b/src/main/java/com/chargebee/v4/models/coupon/params/CouponUnarchiveParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.coupon.params;
+package com.chargebee.v4.models.coupon.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class CouponUnarchiveParams {
 
-  private final Map<String, Object> formData;
-
-  private CouponUnarchiveParams(CouponUnarchiveBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private CouponUnarchiveParams(CouponUnarchiveBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static CouponUnarchiveBuilder builder() {
   }
 
   public static final class CouponUnarchiveBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private CouponUnarchiveBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/models/coupon/params/CouponUpdateForItemsParams.java b/src/main/java/com/chargebee/v4/models/coupon/params/CouponUpdateForItemsParams.java
new file mode 100644
index 00000000..a2036436
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/coupon/params/CouponUpdateForItemsParams.java
@@ -0,0 +1,1104 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.coupon.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class CouponUpdateForItemsParams {
+
+  private final String name;
+
+  private final String invoiceName;
+
+  private final DiscountType discountType;
+
+  private final Long discountAmount;
+
+  private final String currencyCode;
+
+  private final Number discountPercentage;
+
+  private final Integer discountQuantity;
+
+  private final ApplyOn applyOn;
+
+  private final DurationType durationType;
+
+  private final Integer durationMonth;
+
+  private final Timestamp validFrom;
+
+  private final Timestamp validTill;
+
+  private final Integer maxRedemptions;
+
+  private final String invoiceNotes;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final Boolean includedInMrr;
+
+  private final Integer period;
+
+  private final PeriodUnit periodUnit;
+
+  private final List<ItemConstraintsParams> itemConstraints;
+
+  private final List<ItemConstraintCriteriaParams> itemConstraintCriteria;
+
+  private final List<CouponConstraintsParams> couponConstraints;
+
+  private final Map<String, String> customFields;
+
+  private CouponUpdateForItemsParams(CouponUpdateForItemsBuilder builder) {
+
+    this.name = builder.name;
+
+    this.invoiceName = builder.invoiceName;
+
+    this.discountType = builder.discountType;
+
+    this.discountAmount = builder.discountAmount;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.discountPercentage = builder.discountPercentage;
+
+    this.discountQuantity = builder.discountQuantity;
+
+    this.applyOn = builder.applyOn;
+
+    this.durationType = builder.durationType;
+
+    this.durationMonth = builder.durationMonth;
+
+    this.validFrom = builder.validFrom;
+
+    this.validTill = builder.validTill;
+
+    this.maxRedemptions = builder.maxRedemptions;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.metaData = builder.metaData;
+
+    this.includedInMrr = builder.includedInMrr;
+
+    this.period = builder.period;
+
+    this.periodUnit = builder.periodUnit;
+
+    this.itemConstraints = builder.itemConstraints;
+
+    this.itemConstraintCriteria = builder.itemConstraintCriteria;
+
+    this.couponConstraints = builder.couponConstraints;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getInvoiceName() {
+    return invoiceName;
+  }
+
+  public DiscountType getDiscountType() {
+    return discountType;
+  }
+
+  public Long getDiscountAmount() {
+    return discountAmount;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public Number getDiscountPercentage() {
+    return discountPercentage;
+  }
+
+  public Integer getDiscountQuantity() {
+    return discountQuantity;
+  }
+
+  public ApplyOn getApplyOn() {
+    return applyOn;
+  }
+
+  public DurationType getDurationType() {
+    return durationType;
+  }
+
+  public Integer getDurationMonth() {
+    return durationMonth;
+  }
+
+  public Timestamp getValidFrom() {
+    return validFrom;
+  }
+
+  public Timestamp getValidTill() {
+    return validTill;
+  }
+
+  public Integer getMaxRedemptions() {
+    return maxRedemptions;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public Boolean getIncludedInMrr() {
+    return includedInMrr;
+  }
+
+  public Integer getPeriod() {
+    return period;
+  }
+
+  public PeriodUnit getPeriodUnit() {
+    return periodUnit;
+  }
+
+  public List<ItemConstraintsParams> getItemConstraints() {
+    return itemConstraints;
+  }
+
+  public List<ItemConstraintCriteriaParams> getItemConstraintCriteria() {
+    return itemConstraintCriteria;
+  }
+
+  public List<CouponConstraintsParams> getCouponConstraints() {
+    return couponConstraints;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.invoiceName != null) {
+
+      formData.put("invoice_name", this.invoiceName);
+    }
+
+    if (this.discountType != null) {
+
+      formData.put("discount_type", this.discountType);
+    }
+
+    if (this.discountAmount != null) {
+
+      formData.put("discount_amount", this.discountAmount);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.discountPercentage != null) {
+
+      formData.put("discount_percentage", this.discountPercentage);
+    }
+
+    if (this.discountQuantity != null) {
+
+      formData.put("discount_quantity", this.discountQuantity);
+    }
+
+    if (this.applyOn != null) {
+
+      formData.put("apply_on", this.applyOn);
+    }
+
+    if (this.durationType != null) {
+
+      formData.put("duration_type", this.durationType);
+    }
+
+    if (this.durationMonth != null) {
+
+      formData.put("duration_month", this.durationMonth);
+    }
+
+    if (this.validFrom != null) {
+
+      formData.put("valid_from", this.validFrom);
+    }
+
+    if (this.validTill != null) {
+
+      formData.put("valid_till", this.validTill);
+    }
+
+    if (this.maxRedemptions != null) {
+
+      formData.put("max_redemptions", this.maxRedemptions);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.includedInMrr != null) {
+
+      formData.put("included_in_mrr", this.includedInMrr);
+    }
+
+    if (this.period != null) {
+
+      formData.put("period", this.period);
+    }
+
+    if (this.periodUnit != null) {
+
+      formData.put("period_unit", this.periodUnit);
+    }
+
+    if (this.itemConstraints != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemConstraints.size(); i++) {
+        ItemConstraintsParams item = this.itemConstraints.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_constraints[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemConstraintCriteria != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemConstraintCriteria.size(); i++) {
+        ItemConstraintCriteriaParams item = this.itemConstraintCriteria.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_constraint_criteria[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.couponConstraints != null) {
+
+      // List of objects
+      for (int i = 0; i < this.couponConstraints.size(); i++) {
+        CouponConstraintsParams item = this.couponConstraints.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupon_constraints[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CouponUpdateForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CouponUpdateForItemsBuilder builder() {
+    return new CouponUpdateForItemsBuilder();
+  }
+
+  public static final class CouponUpdateForItemsBuilder {
+
+    private String name;
+
+    private String invoiceName;
+
+    private DiscountType discountType;
+
+    private Long discountAmount;
+
+    private String currencyCode;
+
+    private Number discountPercentage;
+
+    private Integer discountQuantity;
+
+    private ApplyOn applyOn;
+
+    private DurationType durationType;
+
+    private Integer durationMonth;
+
+    private Timestamp validFrom;
+
+    private Timestamp validTill;
+
+    private Integer maxRedemptions;
+
+    private String invoiceNotes;
+
+    private java.util.Map<String, Object> metaData;
+
+    private Boolean includedInMrr;
+
+    private Integer period;
+
+    private PeriodUnit periodUnit;
+
+    private List<ItemConstraintsParams> itemConstraints;
+
+    private List<ItemConstraintCriteriaParams> itemConstraintCriteria;
+
+    private List<CouponConstraintsParams> couponConstraints;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private CouponUpdateForItemsBuilder() {}
+
+    public CouponUpdateForItemsBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder invoiceName(String value) {
+      this.invoiceName = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder discountType(DiscountType value) {
+      this.discountType = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder discountAmount(Long value) {
+      this.discountAmount = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder discountPercentage(Number value) {
+      this.discountPercentage = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder discountQuantity(Integer value) {
+      this.discountQuantity = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder applyOn(ApplyOn value) {
+      this.applyOn = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder durationType(DurationType value) {
+      this.durationType = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder durationMonth(Integer value) {
+      this.durationMonth = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder validFrom(Timestamp value) {
+      this.validFrom = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder validTill(Timestamp value) {
+      this.validTill = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder maxRedemptions(Integer value) {
+      this.maxRedemptions = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder includedInMrr(Boolean value) {
+      this.includedInMrr = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder period(Integer value) {
+      this.period = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder periodUnit(PeriodUnit value) {
+      this.periodUnit = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder itemConstraints(List<ItemConstraintsParams> value) {
+      this.itemConstraints = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder itemConstraintCriteria(
+        List<ItemConstraintCriteriaParams> value) {
+      this.itemConstraintCriteria = value;
+      return this;
+    }
+
+    public CouponUpdateForItemsBuilder couponConstraints(List<CouponConstraintsParams> value) {
+      this.couponConstraints = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public CouponUpdateForItemsBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public CouponUpdateForItemsBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CouponUpdateForItemsParams build() {
+      return new CouponUpdateForItemsParams(this);
+    }
+  }
+
+  public enum DiscountType {
+    FIXED_AMOUNT("fixed_amount"),
+
+    PERCENTAGE("percentage"),
+
+    OFFER_QUANTITY("offer_quantity"),
+
+    /** An enum member indicating that DiscountType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    DiscountType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static DiscountType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (DiscountType enumValue : DiscountType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ApplyOn {
+    INVOICE_AMOUNT("invoice_amount"),
+
+    SPECIFIED_ITEMS_TOTAL("specified_items_total"),
+
+    EACH_SPECIFIED_ITEM("each_specified_item"),
+
+    EACH_UNIT_OF_SPECIFIED_ITEMS("each_unit_of_specified_items"),
+
+    /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ApplyOn(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ApplyOn fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ApplyOn enumValue : ApplyOn.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum DurationType {
+    ONE_TIME("one_time"),
+
+    FOREVER("forever"),
+
+    LIMITED_PERIOD("limited_period"),
+
+    /** An enum member indicating that DurationType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    DurationType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static DurationType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (DurationType enumValue : DurationType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PeriodUnit enumValue : PeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ItemConstraintsParams {
+
+    private final Constraint constraint;
+
+    private final ItemType itemType;
+
+    private final List<Object> itemPriceIds;
+
+    private ItemConstraintsParams(ItemConstraintsBuilder builder) {
+
+      this.constraint = builder.constraint;
+
+      this.itemType = builder.itemType;
+
+      this.itemPriceIds = builder.itemPriceIds;
+    }
+
+    public Constraint getConstraint() {
+      return constraint;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public List<Object> getItemPriceIds() {
+      return itemPriceIds;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.constraint != null) {
+
+        formData.put("constraint", this.constraint);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.itemPriceIds != null) {
+
+        formData.put("item_price_ids", JsonUtil.toJson(this.itemPriceIds));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemConstraintsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemConstraintsBuilder builder() {
+      return new ItemConstraintsBuilder();
+    }
+
+    public static final class ItemConstraintsBuilder {
+
+      private Constraint constraint;
+
+      private ItemType itemType;
+
+      private List<Object> itemPriceIds;
+
+      private ItemConstraintsBuilder() {}
+
+      public ItemConstraintsBuilder constraint(Constraint value) {
+        this.constraint = value;
+        return this;
+      }
+
+      public ItemConstraintsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public ItemConstraintsBuilder itemPriceIds(List<Object> value) {
+        this.itemPriceIds = value;
+        return this;
+      }
+
+      public ItemConstraintsParams build() {
+        return new ItemConstraintsParams(this);
+      }
+    }
+
+    public enum Constraint {
+      NONE("none"),
+
+      ALL("all"),
+
+      SPECIFIC("specific"),
+
+      CRITERIA("criteria"),
+
+      /** An enum member indicating that Constraint was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Constraint(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Constraint fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Constraint enumValue : Constraint.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemConstraintCriteriaParams {
+
+    private final ItemType itemType;
+
+    private final List<Object> itemFamilyIds;
+
+    private final List<Object> currencies;
+
+    private final List<Object> itemPricePeriods;
+
+    private ItemConstraintCriteriaParams(ItemConstraintCriteriaBuilder builder) {
+
+      this.itemType = builder.itemType;
+
+      this.itemFamilyIds = builder.itemFamilyIds;
+
+      this.currencies = builder.currencies;
+
+      this.itemPricePeriods = builder.itemPricePeriods;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public List<Object> getItemFamilyIds() {
+      return itemFamilyIds;
+    }
+
+    public List<Object> getCurrencies() {
+      return currencies;
+    }
+
+    public List<Object> getItemPricePeriods() {
+      return itemPricePeriods;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.itemFamilyIds != null) {
+
+        formData.put("item_family_ids", JsonUtil.toJson(this.itemFamilyIds));
+      }
+
+      if (this.currencies != null) {
+
+        formData.put("currencies", JsonUtil.toJson(this.currencies));
+      }
+
+      if (this.itemPricePeriods != null) {
+
+        formData.put("item_price_periods", JsonUtil.toJson(this.itemPricePeriods));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemConstraintCriteriaParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemConstraintCriteriaBuilder builder() {
+      return new ItemConstraintCriteriaBuilder();
+    }
+
+    public static final class ItemConstraintCriteriaBuilder {
+
+      private ItemType itemType;
+
+      private List<Object> itemFamilyIds;
+
+      private List<Object> currencies;
+
+      private List<Object> itemPricePeriods;
+
+      private ItemConstraintCriteriaBuilder() {}
+
+      public ItemConstraintCriteriaBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public ItemConstraintCriteriaBuilder itemFamilyIds(List<Object> value) {
+        this.itemFamilyIds = value;
+        return this;
+      }
+
+      public ItemConstraintCriteriaBuilder currencies(List<Object> value) {
+        this.currencies = value;
+        return this;
+      }
+
+      public ItemConstraintCriteriaBuilder itemPricePeriods(List<Object> value) {
+        this.itemPricePeriods = value;
+        return this;
+      }
+
+      public ItemConstraintCriteriaParams build() {
+        return new ItemConstraintCriteriaParams(this);
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponConstraintsParams {
+
+    private final EntityType entityType;
+
+    private final Type type;
+
+    private final String value;
+
+    private CouponConstraintsParams(CouponConstraintsBuilder builder) {
+
+      this.entityType = builder.entityType;
+
+      this.type = builder.type;
+
+      this.value = builder.value;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponConstraintsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponConstraintsBuilder builder() {
+      return new CouponConstraintsBuilder();
+    }
+
+    public static final class CouponConstraintsBuilder {
+
+      private EntityType entityType;
+
+      private Type type;
+
+      private String value;
+
+      private CouponConstraintsBuilder() {}
+
+      public CouponConstraintsBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public CouponConstraintsBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      public CouponConstraintsBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public CouponConstraintsParams build() {
+        return new CouponConstraintsParams(this);
+      }
+    }
+
+    public enum EntityType {
+      CUSTOMER("customer"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum Type {
+      MAX_REDEMPTIONS("max_redemptions"),
+
+      UNIQUE_BY("unique_by"),
+
+      EXISTING_CUSTOMER("existing_customer"),
+
+      NEW_CUSTOMER("new_customer"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/coupon/params/CouponUpdateParams.java b/src/main/java/com/chargebee/v4/models/coupon/params/CouponUpdateParams.java
new file mode 100644
index 00000000..ca180d7b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/coupon/params/CouponUpdateParams.java
@@ -0,0 +1,647 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.coupon.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class CouponUpdateParams {
+
+  private final String name;
+
+  private final String invoiceName;
+
+  private final DiscountType discountType;
+
+  private final Long discountAmount;
+
+  private final String currencyCode;
+
+  private final Number discountPercentage;
+
+  private final Integer discountQuantity;
+
+  private final ApplyOn applyOn;
+
+  private final DurationType durationType;
+
+  private final Integer durationMonth;
+
+  private final Timestamp validTill;
+
+  private final Integer maxRedemptions;
+
+  private final String invoiceNotes;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final Boolean includedInMrr;
+
+  private final Integer period;
+
+  private final PeriodUnit periodUnit;
+
+  private final PlanConstraint planConstraint;
+
+  private final AddonConstraint addonConstraint;
+
+  private final List<String> planIds;
+
+  private final List<String> addonIds;
+
+  private CouponUpdateParams(CouponUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.invoiceName = builder.invoiceName;
+
+    this.discountType = builder.discountType;
+
+    this.discountAmount = builder.discountAmount;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.discountPercentage = builder.discountPercentage;
+
+    this.discountQuantity = builder.discountQuantity;
+
+    this.applyOn = builder.applyOn;
+
+    this.durationType = builder.durationType;
+
+    this.durationMonth = builder.durationMonth;
+
+    this.validTill = builder.validTill;
+
+    this.maxRedemptions = builder.maxRedemptions;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.metaData = builder.metaData;
+
+    this.includedInMrr = builder.includedInMrr;
+
+    this.period = builder.period;
+
+    this.periodUnit = builder.periodUnit;
+
+    this.planConstraint = builder.planConstraint;
+
+    this.addonConstraint = builder.addonConstraint;
+
+    this.planIds = builder.planIds;
+
+    this.addonIds = builder.addonIds;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getInvoiceName() {
+    return invoiceName;
+  }
+
+  public DiscountType getDiscountType() {
+    return discountType;
+  }
+
+  public Long getDiscountAmount() {
+    return discountAmount;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public Number getDiscountPercentage() {
+    return discountPercentage;
+  }
+
+  public Integer getDiscountQuantity() {
+    return discountQuantity;
+  }
+
+  public ApplyOn getApplyOn() {
+    return applyOn;
+  }
+
+  public DurationType getDurationType() {
+    return durationType;
+  }
+
+  public Integer getDurationMonth() {
+    return durationMonth;
+  }
+
+  public Timestamp getValidTill() {
+    return validTill;
+  }
+
+  public Integer getMaxRedemptions() {
+    return maxRedemptions;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public Boolean getIncludedInMrr() {
+    return includedInMrr;
+  }
+
+  public Integer getPeriod() {
+    return period;
+  }
+
+  public PeriodUnit getPeriodUnit() {
+    return periodUnit;
+  }
+
+  public PlanConstraint getPlanConstraint() {
+    return planConstraint;
+  }
+
+  public AddonConstraint getAddonConstraint() {
+    return addonConstraint;
+  }
+
+  public List<String> getPlanIds() {
+    return planIds;
+  }
+
+  public List<String> getAddonIds() {
+    return addonIds;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.invoiceName != null) {
+
+      formData.put("invoice_name", this.invoiceName);
+    }
+
+    if (this.discountType != null) {
+
+      formData.put("discount_type", this.discountType);
+    }
+
+    if (this.discountAmount != null) {
+
+      formData.put("discount_amount", this.discountAmount);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.discountPercentage != null) {
+
+      formData.put("discount_percentage", this.discountPercentage);
+    }
+
+    if (this.discountQuantity != null) {
+
+      formData.put("discount_quantity", this.discountQuantity);
+    }
+
+    if (this.applyOn != null) {
+
+      formData.put("apply_on", this.applyOn);
+    }
+
+    if (this.durationType != null) {
+
+      formData.put("duration_type", this.durationType);
+    }
+
+    if (this.durationMonth != null) {
+
+      formData.put("duration_month", this.durationMonth);
+    }
+
+    if (this.validTill != null) {
+
+      formData.put("valid_till", this.validTill);
+    }
+
+    if (this.maxRedemptions != null) {
+
+      formData.put("max_redemptions", this.maxRedemptions);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.includedInMrr != null) {
+
+      formData.put("included_in_mrr", this.includedInMrr);
+    }
+
+    if (this.period != null) {
+
+      formData.put("period", this.period);
+    }
+
+    if (this.periodUnit != null) {
+
+      formData.put("period_unit", this.periodUnit);
+    }
+
+    if (this.planConstraint != null) {
+
+      formData.put("plan_constraint", this.planConstraint);
+    }
+
+    if (this.addonConstraint != null) {
+
+      formData.put("addon_constraint", this.addonConstraint);
+    }
+
+    if (this.planIds != null) {
+
+      formData.put("plan_ids", this.planIds);
+    }
+
+    if (this.addonIds != null) {
+
+      formData.put("addon_ids", this.addonIds);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CouponUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CouponUpdateBuilder builder() {
+    return new CouponUpdateBuilder();
+  }
+
+  public static final class CouponUpdateBuilder {
+
+    private String name;
+
+    private String invoiceName;
+
+    private DiscountType discountType;
+
+    private Long discountAmount;
+
+    private String currencyCode;
+
+    private Number discountPercentage;
+
+    private Integer discountQuantity;
+
+    private ApplyOn applyOn;
+
+    private DurationType durationType;
+
+    private Integer durationMonth;
+
+    private Timestamp validTill;
+
+    private Integer maxRedemptions;
+
+    private String invoiceNotes;
+
+    private java.util.Map<String, Object> metaData;
+
+    private Boolean includedInMrr;
+
+    private Integer period;
+
+    private PeriodUnit periodUnit;
+
+    private PlanConstraint planConstraint;
+
+    private AddonConstraint addonConstraint;
+
+    private List<String> planIds;
+
+    private List<String> addonIds;
+
+    private CouponUpdateBuilder() {}
+
+    public CouponUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder invoiceName(String value) {
+      this.invoiceName = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder discountType(DiscountType value) {
+      this.discountType = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder discountAmount(Long value) {
+      this.discountAmount = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder discountPercentage(Number value) {
+      this.discountPercentage = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder discountQuantity(Integer value) {
+      this.discountQuantity = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder applyOn(ApplyOn value) {
+      this.applyOn = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder durationType(DurationType value) {
+      this.durationType = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder durationMonth(Integer value) {
+      this.durationMonth = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder validTill(Timestamp value) {
+      this.validTill = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder maxRedemptions(Integer value) {
+      this.maxRedemptions = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder includedInMrr(Boolean value) {
+      this.includedInMrr = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder period(Integer value) {
+      this.period = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder periodUnit(PeriodUnit value) {
+      this.periodUnit = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder planConstraint(PlanConstraint value) {
+      this.planConstraint = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder addonConstraint(AddonConstraint value) {
+      this.addonConstraint = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder planIds(List<String> value) {
+      this.planIds = value;
+      return this;
+    }
+
+    public CouponUpdateBuilder addonIds(List<String> value) {
+      this.addonIds = value;
+      return this;
+    }
+
+    public CouponUpdateParams build() {
+      return new CouponUpdateParams(this);
+    }
+  }
+
+  public enum DiscountType {
+    FIXED_AMOUNT("fixed_amount"),
+
+    PERCENTAGE("percentage"),
+
+    OFFER_QUANTITY("offer_quantity"),
+
+    /** An enum member indicating that DiscountType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    DiscountType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static DiscountType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (DiscountType enumValue : DiscountType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ApplyOn {
+    INVOICE_AMOUNT("invoice_amount"),
+
+    SPECIFIED_ITEMS_TOTAL("specified_items_total"),
+
+    EACH_SPECIFIED_ITEM("each_specified_item"),
+
+    EACH_UNIT_OF_SPECIFIED_ITEMS("each_unit_of_specified_items"),
+
+    /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ApplyOn(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ApplyOn fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ApplyOn enumValue : ApplyOn.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum DurationType {
+    ONE_TIME("one_time"),
+
+    FOREVER("forever"),
+
+    LIMITED_PERIOD("limited_period"),
+
+    /** An enum member indicating that DurationType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    DurationType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static DurationType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (DurationType enumValue : DurationType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PeriodUnit enumValue : PeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PlanConstraint {
+    NONE("none"),
+
+    ALL("all"),
+
+    SPECIFIC("specific"),
+
+    /** An enum member indicating that PlanConstraint was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PlanConstraint(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PlanConstraint fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PlanConstraint enumValue : PlanConstraint.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AddonConstraint {
+    NONE("none"),
+
+    ALL("all"),
+
+    SPECIFIC("specific"),
+
+    /** An enum member indicating that AddonConstraint was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AddonConstraint(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AddonConstraint fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AddonConstraint enumValue : AddonConstraint.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponCopyResponse.java b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponCopyResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/coupon/CouponCopyResponse.java
rename to src/main/java/com/chargebee/v4/models/coupon/responses/CouponCopyResponse.java
index 5e37bc7a..8d26480a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponCopyResponse.java
+++ b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponCopyResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.coupon;
+package com.chargebee.v4.models.coupon.responses;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.coupon.Coupon;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponCreateForItemsResponse.java b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponCreateForItemsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/coupon/CouponCreateForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/coupon/responses/CouponCreateForItemsResponse.java
index dd7d106e..05b8310c 100644
--- a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponCreateForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponCreateForItemsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.coupon;
+package com.chargebee.v4.models.coupon.responses;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.coupon.Coupon;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponCreateResponse.java b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/coupon/CouponCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/coupon/responses/CouponCreateResponse.java
index c0015b25..35524225 100644
--- a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.coupon;
+package com.chargebee.v4.models.coupon.responses;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.coupon.Coupon;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponDeleteResponse.java b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/coupon/CouponDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/coupon/responses/CouponDeleteResponse.java
index b8838859..28aa79b5 100644
--- a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.coupon;
+package com.chargebee.v4.models.coupon.responses;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.coupon.Coupon;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponListResponse.java b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponListResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/coupon/CouponListResponse.java
rename to src/main/java/com/chargebee/v4/models/coupon/responses/CouponListResponse.java
index 27c2345b..afc11db0 100644
--- a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.coupon;
+package com.chargebee.v4.models.coupon.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.coupon.Coupon;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.CouponService;
-import com.chargebee.v4.core.models.coupon.params.CouponListParams;
+import com.chargebee.v4.services.CouponService;
+import com.chargebee.v4.models.coupon.params.CouponListParams;
 
 /** Immutable response object for CouponList operation. Contains paginated list data. */
 public final class CouponListResponse {
@@ -95,9 +96,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public CouponListResponse nextPage() throws Exception {
+  public CouponListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/coupon/responses/CouponRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponRetrieveResponse.java
new file mode 100644
index 00000000..bc613eb1
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.coupon.responses;
+
+import com.chargebee.v4.models.coupon.Coupon;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CouponRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class CouponRetrieveResponse extends BaseResponse {
+  private final Coupon coupon;
+
+  private CouponRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.coupon = builder.coupon;
+  }
+
+  /** Parse JSON response into CouponRetrieveResponse object. */
+  public static CouponRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CouponRetrieveResponse object with HTTP response. */
+  public static CouponRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __couponJson = JsonUtil.getObject(json, "coupon");
+      if (__couponJson != null) {
+        builder.coupon(Coupon.fromJson(__couponJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CouponRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CouponRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CouponRetrieveResponse. */
+  public static class Builder {
+
+    private Coupon coupon;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder coupon(Coupon coupon) {
+      this.coupon = coupon;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CouponRetrieveResponse build() {
+      return new CouponRetrieveResponse(this);
+    }
+  }
+
+  /** Get the coupon from the response. */
+  public Coupon getCoupon() {
+    return coupon;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponUnarchiveResponse.java b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponUnarchiveResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/coupon/CouponUnarchiveResponse.java
rename to src/main/java/com/chargebee/v4/models/coupon/responses/CouponUnarchiveResponse.java
index 61e15737..33890d4a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponUnarchiveResponse.java
+++ b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponUnarchiveResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.coupon;
+package com.chargebee.v4.models.coupon.responses;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.coupon.Coupon;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponUpdateForItemsResponse.java b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponUpdateForItemsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/coupon/CouponUpdateForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/coupon/responses/CouponUpdateForItemsResponse.java
index bc1e70fc..06d37a99 100644
--- a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponUpdateForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponUpdateForItemsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.coupon;
+package com.chargebee.v4.models.coupon.responses;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.coupon.Coupon;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponUpdateResponse.java b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/coupon/CouponUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/coupon/responses/CouponUpdateResponse.java
index 95ca598f..9d695499 100644
--- a/src/main/java/com/chargebee/v4/core/responses/coupon/CouponUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/coupon/responses/CouponUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.coupon;
+package com.chargebee.v4.models.coupon.responses;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.coupon.Coupon;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponCode/CouponCode.java b/src/main/java/com/chargebee/v4/models/couponCode/CouponCode.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/couponCode/CouponCode.java
rename to src/main/java/com/chargebee/v4/models/couponCode/CouponCode.java
index 41ca9c06..494039e4 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponCode/CouponCode.java
+++ b/src/main/java/com/chargebee/v4/models/couponCode/CouponCode.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponCode;
+package com.chargebee.v4.models.couponCode;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponCode/params/CouponCodeArchiveParams.java b/src/main/java/com/chargebee/v4/models/couponCode/params/CouponCodeArchiveParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/couponCode/params/CouponCodeArchiveParams.java
rename to src/main/java/com/chargebee/v4/models/couponCode/params/CouponCodeArchiveParams.java
index c08485ea..c64fbd46 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponCode/params/CouponCodeArchiveParams.java
+++ b/src/main/java/com/chargebee/v4/models/couponCode/params/CouponCodeArchiveParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.couponCode.params;
+package com.chargebee.v4.models.couponCode.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class CouponCodeArchiveParams {
 
-  private final Map<String, Object> formData;
-
-  private CouponCodeArchiveParams(CouponCodeArchiveBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private CouponCodeArchiveParams(CouponCodeArchiveBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static CouponCodeArchiveBuilder builder() {
   }
 
   public static final class CouponCodeArchiveBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private CouponCodeArchiveBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/models/couponCode/params/CouponCodeCreateParams.java b/src/main/java/com/chargebee/v4/models/couponCode/params/CouponCodeCreateParams.java
new file mode 100644
index 00000000..73963faa
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/couponCode/params/CouponCodeCreateParams.java
@@ -0,0 +1,100 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.couponCode.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CouponCodeCreateParams {
+
+  private final String couponId;
+
+  private final String couponSetName;
+
+  private final String code;
+
+  private CouponCodeCreateParams(CouponCodeCreateBuilder builder) {
+
+    this.couponId = builder.couponId;
+
+    this.couponSetName = builder.couponSetName;
+
+    this.code = builder.code;
+  }
+
+  public String getCouponId() {
+    return couponId;
+  }
+
+  public String getCouponSetName() {
+    return couponSetName;
+  }
+
+  public String getCode() {
+    return code;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.couponId != null) {
+
+      formData.put("coupon_id", this.couponId);
+    }
+
+    if (this.couponSetName != null) {
+
+      formData.put("coupon_set_name", this.couponSetName);
+    }
+
+    if (this.code != null) {
+
+      formData.put("code", this.code);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CouponCodeCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CouponCodeCreateBuilder builder() {
+    return new CouponCodeCreateBuilder();
+  }
+
+  public static final class CouponCodeCreateBuilder {
+
+    private String couponId;
+
+    private String couponSetName;
+
+    private String code;
+
+    private CouponCodeCreateBuilder() {}
+
+    public CouponCodeCreateBuilder couponId(String value) {
+      this.couponId = value;
+      return this;
+    }
+
+    public CouponCodeCreateBuilder couponSetName(String value) {
+      this.couponSetName = value;
+      return this;
+    }
+
+    public CouponCodeCreateBuilder code(String value) {
+      this.code = value;
+      return this;
+    }
+
+    public CouponCodeCreateParams build() {
+      return new CouponCodeCreateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/couponCode/params/CouponCodeListParams.java b/src/main/java/com/chargebee/v4/models/couponCode/params/CouponCodeListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/couponCode/params/CouponCodeListParams.java
rename to src/main/java/com/chargebee/v4/models/couponCode/params/CouponCodeListParams.java
index 3f858a75..96be749a 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponCode/params/CouponCodeListParams.java
+++ b/src/main/java/com/chargebee/v4/models/couponCode/params/CouponCodeListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponCode.params;
+package com.chargebee.v4.models.couponCode.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponCode/params/CouponCodeRetrieveParams.java b/src/main/java/com/chargebee/v4/models/couponCode/params/CouponCodeRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/couponCode/params/CouponCodeRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/couponCode/params/CouponCodeRetrieveParams.java
index a8c55d72..69a31afc 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponCode/params/CouponCodeRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/couponCode/params/CouponCodeRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponCode.params;
+package com.chargebee.v4.models.couponCode.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/couponCode/CouponCodeArchiveResponse.java b/src/main/java/com/chargebee/v4/models/couponCode/responses/CouponCodeArchiveResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/couponCode/CouponCodeArchiveResponse.java
rename to src/main/java/com/chargebee/v4/models/couponCode/responses/CouponCodeArchiveResponse.java
index b50ae736..de47aa1c 100644
--- a/src/main/java/com/chargebee/v4/core/responses/couponCode/CouponCodeArchiveResponse.java
+++ b/src/main/java/com/chargebee/v4/models/couponCode/responses/CouponCodeArchiveResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.couponCode;
+package com.chargebee.v4.models.couponCode.responses;
 
-import com.chargebee.v4.core.models.couponCode.CouponCode;
+import com.chargebee.v4.models.couponCode.CouponCode;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/couponCode/CouponCodeCreateResponse.java b/src/main/java/com/chargebee/v4/models/couponCode/responses/CouponCodeCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/couponCode/CouponCodeCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/couponCode/responses/CouponCodeCreateResponse.java
index 460c87b5..6d921400 100644
--- a/src/main/java/com/chargebee/v4/core/responses/couponCode/CouponCodeCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/couponCode/responses/CouponCodeCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.couponCode;
+package com.chargebee.v4.models.couponCode.responses;
 
-import com.chargebee.v4.core.models.couponCode.CouponCode;
+import com.chargebee.v4.models.couponCode.CouponCode;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/couponCode/CouponCodeListResponse.java b/src/main/java/com/chargebee/v4/models/couponCode/responses/CouponCodeListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/couponCode/CouponCodeListResponse.java
rename to src/main/java/com/chargebee/v4/models/couponCode/responses/CouponCodeListResponse.java
index 37466ef3..23ee2c5e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/couponCode/CouponCodeListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/couponCode/responses/CouponCodeListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.couponCode;
+package com.chargebee.v4.models.couponCode.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.couponCode.CouponCode;
+import com.chargebee.v4.models.couponCode.CouponCode;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.CouponCodeService;
-import com.chargebee.v4.core.models.couponCode.params.CouponCodeListParams;
+import com.chargebee.v4.services.CouponCodeService;
+import com.chargebee.v4.models.couponCode.params.CouponCodeListParams;
 
 /** Immutable response object for CouponCodeList operation. Contains paginated list data. */
 public final class CouponCodeListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public CouponCodeListResponse nextPage() throws Exception {
+  public CouponCodeListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/couponCode/responses/CouponCodeRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/couponCode/responses/CouponCodeRetrieveResponse.java
new file mode 100644
index 00000000..511f72d5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/couponCode/responses/CouponCodeRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.couponCode.responses;
+
+import com.chargebee.v4.models.couponCode.CouponCode;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CouponCodeRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class CouponCodeRetrieveResponse extends BaseResponse {
+  private final CouponCode couponCode;
+
+  private CouponCodeRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.couponCode = builder.couponCode;
+  }
+
+  /** Parse JSON response into CouponCodeRetrieveResponse object. */
+  public static CouponCodeRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CouponCodeRetrieveResponse object with HTTP response. */
+  public static CouponCodeRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __couponCodeJson = JsonUtil.getObject(json, "coupon_code");
+      if (__couponCodeJson != null) {
+        builder.couponCode(CouponCode.fromJson(__couponCodeJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CouponCodeRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CouponCodeRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CouponCodeRetrieveResponse. */
+  public static class Builder {
+
+    private CouponCode couponCode;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder couponCode(CouponCode couponCode) {
+      this.couponCode = couponCode;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CouponCodeRetrieveResponse build() {
+      return new CouponCodeRetrieveResponse(this);
+    }
+  }
+
+  /** Get the couponCode from the response. */
+  public CouponCode getCouponCode() {
+    return couponCode;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/couponSet/CouponSet.java b/src/main/java/com/chargebee/v4/models/couponSet/CouponSet.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/couponSet/CouponSet.java
rename to src/main/java/com/chargebee/v4/models/couponSet/CouponSet.java
index e50673ce..fe03f80a 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponSet/CouponSet.java
+++ b/src/main/java/com/chargebee/v4/models/couponSet/CouponSet.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponSet;
+package com.chargebee.v4.models.couponSet;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetAddCouponCodesParams.java b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetAddCouponCodesParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetAddCouponCodesParams.java
rename to src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetAddCouponCodesParams.java
index a12d0cff..15936fcf 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetAddCouponCodesParams.java
+++ b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetAddCouponCodesParams.java
@@ -4,25 +4,36 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.couponSet.params;
+package com.chargebee.v4.models.couponSet.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.List;
 
 public final class CouponSetAddCouponCodesParams {
 
-  private final Map<String, Object> formData;
+  private final List<String> code;
 
   private CouponSetAddCouponCodesParams(CouponSetAddCouponCodesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
+
+    this.code = builder.code;
+  }
+
+  public List<String> getCode() {
+    return code;
   }
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.code != null) {
+
+      formData.put("code", this.code);
+    }
+
     return formData;
   }
 
@@ -33,14 +44,13 @@ public static CouponSetAddCouponCodesBuilder builder() {
   }
 
   public static final class CouponSetAddCouponCodesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
+
+    private List<String> code;
 
     private CouponSetAddCouponCodesBuilder() {}
 
     public CouponSetAddCouponCodesBuilder code(List<String> value) {
-
-      formData.put("code", value);
-
+      this.code = value;
       return this;
     }
 
diff --git a/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetCreateParams.java b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetCreateParams.java
new file mode 100644
index 00000000..7210d629
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetCreateParams.java
@@ -0,0 +1,121 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.couponSet.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CouponSetCreateParams {
+
+  private final String couponId;
+
+  private final String name;
+
+  private final String id;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private CouponSetCreateParams(CouponSetCreateBuilder builder) {
+
+    this.couponId = builder.couponId;
+
+    this.name = builder.name;
+
+    this.id = builder.id;
+
+    this.metaData = builder.metaData;
+  }
+
+  public String getCouponId() {
+    return couponId;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.couponId != null) {
+
+      formData.put("coupon_id", this.couponId);
+    }
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CouponSetCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CouponSetCreateBuilder builder() {
+    return new CouponSetCreateBuilder();
+  }
+
+  public static final class CouponSetCreateBuilder {
+
+    private String couponId;
+
+    private String name;
+
+    private String id;
+
+    private java.util.Map<String, Object> metaData;
+
+    private CouponSetCreateBuilder() {}
+
+    public CouponSetCreateBuilder couponId(String value) {
+      this.couponId = value;
+      return this;
+    }
+
+    public CouponSetCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public CouponSetCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public CouponSetCreateBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public CouponSetCreateParams build() {
+      return new CouponSetCreateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetDeleteParams.java b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetDeleteParams.java
index e524a029..031d8ebe 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetDeleteParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.couponSet.params;
+package com.chargebee.v4.models.couponSet.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class CouponSetDeleteParams {
 
-  private final Map<String, Object> formData;
-
-  private CouponSetDeleteParams(CouponSetDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private CouponSetDeleteParams(CouponSetDeleteBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static CouponSetDeleteBuilder builder() {
   }
 
   public static final class CouponSetDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private CouponSetDeleteBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetDeleteUnusedCouponCodesParams.java b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetDeleteUnusedCouponCodesParams.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetDeleteUnusedCouponCodesParams.java
rename to src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetDeleteUnusedCouponCodesParams.java
index 1bb7350b..222707c9 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetDeleteUnusedCouponCodesParams.java
+++ b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetDeleteUnusedCouponCodesParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.couponSet.params;
+package com.chargebee.v4.models.couponSet.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class CouponSetDeleteUnusedCouponCodesParams {
 
-  private final Map<String, Object> formData;
-
-  private CouponSetDeleteUnusedCouponCodesParams(CouponSetDeleteUnusedCouponCodesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private CouponSetDeleteUnusedCouponCodesParams(CouponSetDeleteUnusedCouponCodesBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static CouponSetDeleteUnusedCouponCodesBuilder builder() {
   }
 
   public static final class CouponSetDeleteUnusedCouponCodesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private CouponSetDeleteUnusedCouponCodesBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetListParams.java b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetListParams.java
rename to src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetListParams.java
index c8ad4578..042d346e 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetListParams.java
+++ b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponSet.params;
+package com.chargebee.v4.models.couponSet.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetRetrieveParams.java b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetRetrieveParams.java
index c2540621..8bde6362 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponSet/params/CouponSetRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponSet.params;
+package com.chargebee.v4.models.couponSet.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetUpdateParams.java b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetUpdateParams.java
new file mode 100644
index 00000000..bfbb5c04
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/couponSet/params/CouponSetUpdateParams.java
@@ -0,0 +1,81 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.couponSet.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CouponSetUpdateParams {
+
+  private final String name;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private CouponSetUpdateParams(CouponSetUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.metaData = builder.metaData;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CouponSetUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CouponSetUpdateBuilder builder() {
+    return new CouponSetUpdateBuilder();
+  }
+
+  public static final class CouponSetUpdateBuilder {
+
+    private String name;
+
+    private java.util.Map<String, Object> metaData;
+
+    private CouponSetUpdateBuilder() {}
+
+    public CouponSetUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public CouponSetUpdateBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public CouponSetUpdateParams build() {
+      return new CouponSetUpdateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetAddCouponCodesResponse.java b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetAddCouponCodesResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetAddCouponCodesResponse.java
rename to src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetAddCouponCodesResponse.java
index 0a665a56..4c833f88 100644
--- a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetAddCouponCodesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetAddCouponCodesResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.couponSet;
+package com.chargebee.v4.models.couponSet.responses;
 
-import com.chargebee.v4.core.models.couponSet.CouponSet;
+import com.chargebee.v4.models.couponSet.CouponSet;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetCreateResponse.java b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetCreateResponse.java
index 4de1e977..9a763e2f 100644
--- a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.couponSet;
+package com.chargebee.v4.models.couponSet.responses;
 
-import com.chargebee.v4.core.models.couponSet.CouponSet;
+import com.chargebee.v4.models.couponSet.CouponSet;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetDeleteResponse.java b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetDeleteResponse.java
index 70025657..b164aa89 100644
--- a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.couponSet;
+package com.chargebee.v4.models.couponSet.responses;
 
-import com.chargebee.v4.core.models.couponSet.CouponSet;
+import com.chargebee.v4.models.couponSet.CouponSet;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetDeleteUnusedCouponCodesResponse.java b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetDeleteUnusedCouponCodesResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetDeleteUnusedCouponCodesResponse.java
rename to src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetDeleteUnusedCouponCodesResponse.java
index b0a78244..93f6fb6c 100644
--- a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetDeleteUnusedCouponCodesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetDeleteUnusedCouponCodesResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.couponSet;
+package com.chargebee.v4.models.couponSet.responses;
 
-import com.chargebee.v4.core.models.couponSet.CouponSet;
+import com.chargebee.v4.models.couponSet.CouponSet;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetListResponse.java b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetListResponse.java
rename to src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetListResponse.java
index 6f589c7b..fb7e79b8 100644
--- a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.couponSet;
+package com.chargebee.v4.models.couponSet.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.couponSet.CouponSet;
+import com.chargebee.v4.models.couponSet.CouponSet;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.CouponSetService;
-import com.chargebee.v4.core.models.couponSet.params.CouponSetListParams;
+import com.chargebee.v4.services.CouponSetService;
+import com.chargebee.v4.models.couponSet.params.CouponSetListParams;
 
 /** Immutable response object for CouponSetList operation. Contains paginated list data. */
 public final class CouponSetListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public CouponSetListResponse nextPage() throws Exception {
+  public CouponSetListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetRetrieveResponse.java
new file mode 100644
index 00000000..b1a2861a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.couponSet.responses;
+
+import com.chargebee.v4.models.couponSet.CouponSet;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CouponSetRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class CouponSetRetrieveResponse extends BaseResponse {
+  private final CouponSet couponSet;
+
+  private CouponSetRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.couponSet = builder.couponSet;
+  }
+
+  /** Parse JSON response into CouponSetRetrieveResponse object. */
+  public static CouponSetRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CouponSetRetrieveResponse object with HTTP response. */
+  public static CouponSetRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __couponSetJson = JsonUtil.getObject(json, "coupon_set");
+      if (__couponSetJson != null) {
+        builder.couponSet(CouponSet.fromJson(__couponSetJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CouponSetRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CouponSetRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CouponSetRetrieveResponse. */
+  public static class Builder {
+
+    private CouponSet couponSet;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder couponSet(CouponSet couponSet) {
+      this.couponSet = couponSet;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CouponSetRetrieveResponse build() {
+      return new CouponSetRetrieveResponse(this);
+    }
+  }
+
+  /** Get the couponSet from the response. */
+  public CouponSet getCouponSet() {
+    return couponSet;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetUpdateResponse.java b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetUpdateResponse.java
index e4e703fc..dd7b16eb 100644
--- a/src/main/java/com/chargebee/v4/core/responses/couponSet/CouponSetUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.couponSet;
+package com.chargebee.v4.models.couponSet.responses;
 
-import com.chargebee.v4.core.models.couponSet.CouponSet;
+import com.chargebee.v4.models.couponSet.CouponSet;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/CreditNote.java b/src/main/java/com/chargebee/v4/models/creditNote/CreditNote.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/creditNote/CreditNote.java
rename to src/main/java/com/chargebee/v4/models/creditNote/CreditNote.java
index e8b53a50..c9aada49 100644
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/CreditNote.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/CreditNote.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.creditNote;
+package com.chargebee.v4.models.creditNote;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.math.BigDecimal;
@@ -35,6 +35,7 @@ public class CreditNote {
   private Long resourceVersion;
   private Timestamp updatedAt;
   private Channel channel;
+  private String lineItemsNextOffset;
   private Long subTotal;
   private Long subTotalInLocalCurrency;
   private Long totalInLocalCurrency;
@@ -62,7 +63,7 @@ public class CreditNote {
   private Einvoice einvoice;
   private SiteDetailsAtCreation siteDetailsAtCreation;
 
-  private java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+  private java.util.Map<String, String> customFields = new java.util.HashMap<>();
 
   public String getId() {
     return id;
@@ -148,6 +149,10 @@ public Channel getChannel() {
     return channel;
   }
 
+  public String getLineItemsNextOffset() {
+    return lineItemsNextOffset;
+  }
+
   public Long getSubTotal() {
     return subTotal;
   }
@@ -258,7 +263,7 @@ public SiteDetailsAtCreation getSiteDetailsAtCreation() {
    *
    * @return map containing all custom fields
    */
-  public java.util.Map<String, Object> getCustomFields() {
+  public java.util.Map<String, String> getCustomFields() {
     return customFields;
   }
 
@@ -268,7 +273,7 @@ public java.util.Map<String, Object> getCustomFields() {
    * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
    * @return the value of the custom field, or null if not present
    */
-  public Object getCustomField(String fieldName) {
+  public String getCustomField(String fieldName) {
     return customFields.get(fieldName);
   }
 
@@ -443,7 +448,7 @@ public static Channel fromString(String value) {
   public static CreditNote fromJson(String json) {
     CreditNote obj = new CreditNote();
 
-    // Parse JSON to extract all keys
+    // Parse JSON to extract all keys for custom field extraction
     java.util.Set<String> knownFields = new java.util.HashSet<>();
 
     knownFields.add("id");
@@ -488,6 +493,8 @@ public static CreditNote fromJson(String json) {
 
     knownFields.add("channel");
 
+    knownFields.add("line_items_next_offset");
+
     knownFields.add("sub_total");
 
     knownFields.add("sub_total_in_local_currency");
@@ -582,6 +589,8 @@ public static CreditNote fromJson(String json) {
 
     obj.channel = Channel.fromString(JsonUtil.getString(json, "channel"));
 
+    obj.lineItemsNextOffset = JsonUtil.getString(json, "line_items_next_offset");
+
     obj.subTotal = JsonUtil.getLong(json, "sub_total");
 
     obj.subTotalInLocalCurrency = JsonUtil.getLong(json, "sub_total_in_local_currency");
@@ -690,9 +699,9 @@ public static CreditNote fromJson(String json) {
    * @param knownFields set of known field names
    * @return map of custom fields
    */
-  private static java.util.Map<String, Object> extractCustomFields(
+  private static java.util.Map<String, String> extractCustomFields(
       String json, java.util.Set<String> knownFields) {
-    java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+    java.util.Map<String, String> customFields = new java.util.HashMap<>();
     try {
       // Parse the entire JSON as a map
       java.util.Map<String, Object> allFields = JsonUtil.parseJsonObjectToMap(json);
@@ -701,7 +710,8 @@ private static java.util.Map<String, Object> extractCustomFields(
           String key = entry.getKey();
           // Include fields that start with "cf_" and are not in knownFields
           if (key != null && key.startsWith("cf_") && !knownFields.contains(key)) {
-            customFields.put(key, entry.getValue());
+            customFields.put(
+                key, entry.getValue() != null ? String.valueOf(entry.getValue()) : null);
           }
         }
       }
@@ -1518,6 +1528,7 @@ public static class Discounts {
 
     private Long amount;
     private String description;
+    private String lineItemId;
     private EntityType entityType;
     private DiscountType discountType;
     private String entityId;
@@ -1531,6 +1542,10 @@ public String getDescription() {
       return description;
     }
 
+    public String getLineItemId() {
+      return lineItemId;
+    }
+
     public EntityType getEntityType() {
       return entityType;
     }
@@ -1618,6 +1633,8 @@ public static Discounts fromJson(String json) {
 
       obj.description = JsonUtil.getString(json, "description");
 
+      obj.lineItemId = JsonUtil.getString(json, "line_item_id");
+
       obj.entityType = EntityType.fromString(JsonUtil.getString(json, "entity_type"));
 
       obj.discountType = DiscountType.fromString(JsonUtil.getString(json, "discount_type"));
diff --git a/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteCreateParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteCreateParams.java
new file mode 100644
index 00000000..9dffd6c4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteCreateParams.java
@@ -0,0 +1,674 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.creditNote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class CreditNoteCreateParams {
+
+  private final String referenceInvoiceId;
+
+  private final String customerId;
+
+  private final Long total;
+
+  private final Type type;
+
+  private final ReasonCode reasonCode;
+
+  private final String createReasonCode;
+
+  private final Timestamp date;
+
+  private final String customerNotes;
+
+  private final String currencyCode;
+
+  private final String comment;
+
+  private final List<LineItemsParams> lineItems;
+
+  private final Map<String, String> customFields;
+
+  private CreditNoteCreateParams(CreditNoteCreateBuilder builder) {
+
+    this.referenceInvoiceId = builder.referenceInvoiceId;
+
+    this.customerId = builder.customerId;
+
+    this.total = builder.total;
+
+    this.type = builder.type;
+
+    this.reasonCode = builder.reasonCode;
+
+    this.createReasonCode = builder.createReasonCode;
+
+    this.date = builder.date;
+
+    this.customerNotes = builder.customerNotes;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.comment = builder.comment;
+
+    this.lineItems = builder.lineItems;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getReferenceInvoiceId() {
+    return referenceInvoiceId;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public Long getTotal() {
+    return total;
+  }
+
+  public Type getType() {
+    return type;
+  }
+
+  public ReasonCode getReasonCode() {
+    return reasonCode;
+  }
+
+  public String getCreateReasonCode() {
+    return createReasonCode;
+  }
+
+  public Timestamp getDate() {
+    return date;
+  }
+
+  public String getCustomerNotes() {
+    return customerNotes;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public List<LineItemsParams> getLineItems() {
+    return lineItems;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.referenceInvoiceId != null) {
+
+      formData.put("reference_invoice_id", this.referenceInvoiceId);
+    }
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.total != null) {
+
+      formData.put("total", this.total);
+    }
+
+    if (this.type != null) {
+
+      formData.put("type", this.type);
+    }
+
+    if (this.reasonCode != null) {
+
+      formData.put("reason_code", this.reasonCode);
+    }
+
+    if (this.createReasonCode != null) {
+
+      formData.put("create_reason_code", this.createReasonCode);
+    }
+
+    if (this.date != null) {
+
+      formData.put("date", this.date);
+    }
+
+    if (this.customerNotes != null) {
+
+      formData.put("customer_notes", this.customerNotes);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.lineItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.lineItems.size(); i++) {
+        LineItemsParams item = this.lineItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "line_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CreditNoteCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreditNoteCreateBuilder builder() {
+    return new CreditNoteCreateBuilder();
+  }
+
+  public static final class CreditNoteCreateBuilder {
+
+    private String referenceInvoiceId;
+
+    private String customerId;
+
+    private Long total;
+
+    private Type type;
+
+    private ReasonCode reasonCode;
+
+    private String createReasonCode;
+
+    private Timestamp date;
+
+    private String customerNotes;
+
+    private String currencyCode;
+
+    private String comment;
+
+    private List<LineItemsParams> lineItems;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private CreditNoteCreateBuilder() {}
+
+    public CreditNoteCreateBuilder referenceInvoiceId(String value) {
+      this.referenceInvoiceId = value;
+      return this;
+    }
+
+    public CreditNoteCreateBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public CreditNoteCreateBuilder total(Long value) {
+      this.total = value;
+      return this;
+    }
+
+    public CreditNoteCreateBuilder type(Type value) {
+      this.type = value;
+      return this;
+    }
+
+    public CreditNoteCreateBuilder reasonCode(ReasonCode value) {
+      this.reasonCode = value;
+      return this;
+    }
+
+    public CreditNoteCreateBuilder createReasonCode(String value) {
+      this.createReasonCode = value;
+      return this;
+    }
+
+    public CreditNoteCreateBuilder date(Timestamp value) {
+      this.date = value;
+      return this;
+    }
+
+    public CreditNoteCreateBuilder customerNotes(String value) {
+      this.customerNotes = value;
+      return this;
+    }
+
+    public CreditNoteCreateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public CreditNoteCreateBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public CreditNoteCreateBuilder lineItems(List<LineItemsParams> value) {
+      this.lineItems = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public CreditNoteCreateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public CreditNoteCreateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CreditNoteCreateParams build() {
+      return new CreditNoteCreateParams(this);
+    }
+  }
+
+  public enum Type {
+    ADJUSTMENT("adjustment"),
+
+    REFUNDABLE("refundable"),
+
+    STORE("store"),
+
+    /** An enum member indicating that Type was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Type(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Type fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Type enumValue : Type.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ReasonCode {
+    PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
+
+    SERVICE_UNSATISFACTORY("service_unsatisfactory"),
+
+    ORDER_CHANGE("order_change"),
+
+    ORDER_CANCELLATION("order_cancellation"),
+
+    WAIVER("waiver"),
+
+    OTHER("other"),
+
+    /** An enum member indicating that ReasonCode was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ReasonCode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ReasonCode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ReasonCode enumValue : ReasonCode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class LineItemsParams {
+
+    private final String referenceLineItemId;
+
+    private final Long unitAmount;
+
+    private final String unitAmountInDecimal;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long amount;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private final String description;
+
+    private final EntityType entityType;
+
+    private final String entityId;
+
+    private LineItemsParams(LineItemsBuilder builder) {
+
+      this.referenceLineItemId = builder.referenceLineItemId;
+
+      this.unitAmount = builder.unitAmount;
+
+      this.unitAmountInDecimal = builder.unitAmountInDecimal;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.amount = builder.amount;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+
+      this.description = builder.description;
+
+      this.entityType = builder.entityType;
+
+      this.entityId = builder.entityId;
+    }
+
+    public String getReferenceLineItemId() {
+      return referenceLineItemId;
+    }
+
+    public Long getUnitAmount() {
+      return unitAmount;
+    }
+
+    public String getUnitAmountInDecimal() {
+      return unitAmountInDecimal;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.referenceLineItemId != null) {
+
+        formData.put("reference_line_item_id", this.referenceLineItemId);
+      }
+
+      if (this.unitAmount != null) {
+
+        formData.put("unit_amount", this.unitAmount);
+      }
+
+      if (this.unitAmountInDecimal != null) {
+
+        formData.put("unit_amount_in_decimal", this.unitAmountInDecimal);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LineItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LineItemsBuilder builder() {
+      return new LineItemsBuilder();
+    }
+
+    public static final class LineItemsBuilder {
+
+      private String referenceLineItemId;
+
+      private Long unitAmount;
+
+      private String unitAmountInDecimal;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long amount;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private String description;
+
+      private EntityType entityType;
+
+      private String entityId;
+
+      private LineItemsBuilder() {}
+
+      public LineItemsBuilder referenceLineItemId(String value) {
+        this.referenceLineItemId = value;
+        return this;
+      }
+
+      public LineItemsBuilder unitAmount(Long value) {
+        this.unitAmount = value;
+        return this;
+      }
+
+      public LineItemsBuilder unitAmountInDecimal(String value) {
+        this.unitAmountInDecimal = value;
+        return this;
+      }
+
+      public LineItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public LineItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public LineItemsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public LineItemsBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public LineItemsBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public LineItemsBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public LineItemsBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public LineItemsParams build() {
+        return new LineItemsParams(this);
+      }
+    }
+
+    public enum EntityType {
+      ADHOC("adhoc"),
+
+      PLAN_ITEM_PRICE("plan_item_price"),
+
+      ADDON_ITEM_PRICE("addon_item_price"),
+
+      CHARGE_ITEM_PRICE("charge_item_price"),
+
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteDeleteParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteDeleteParams.java
new file mode 100644
index 00000000..1fabd136
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteDeleteParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.creditNote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CreditNoteDeleteParams {
+
+  private final String comment;
+
+  private CreditNoteDeleteParams(CreditNoteDeleteBuilder builder) {
+
+    this.comment = builder.comment;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CreditNoteDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreditNoteDeleteBuilder builder() {
+    return new CreditNoteDeleteBuilder();
+  }
+
+  public static final class CreditNoteDeleteBuilder {
+
+    private String comment;
+
+    private CreditNoteDeleteBuilder() {}
+
+    public CreditNoteDeleteBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public CreditNoteDeleteParams build() {
+      return new CreditNoteDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteDownloadEinvoiceParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteDownloadEinvoiceParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteDownloadEinvoiceParams.java
rename to src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteDownloadEinvoiceParams.java
index a0503d45..b12611a8 100644
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteDownloadEinvoiceParams.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteDownloadEinvoiceParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.creditNote.params;
+package com.chargebee.v4.models.creditNote.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteListParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteListParams.java
rename to src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteListParams.java
index 91e25607..acb1288a 100644
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteListParams.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.creditNote.params;
+package com.chargebee.v4.models.creditNote.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNotePdfParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNotePdfParams.java
similarity index 78%
rename from src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNotePdfParams.java
rename to src/main/java/com/chargebee/v4/models/creditNote/params/CreditNotePdfParams.java
index 6131dbde..b0add7a7 100644
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNotePdfParams.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNotePdfParams.java
@@ -4,24 +4,35 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.creditNote.params;
+package com.chargebee.v4.models.creditNote.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class CreditNotePdfParams {
 
-  private final Map<String, Object> formData;
+  private final DispositionType dispositionType;
 
   private CreditNotePdfParams(CreditNotePdfBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
+
+    this.dispositionType = builder.dispositionType;
+  }
+
+  public DispositionType getDispositionType() {
+    return dispositionType;
   }
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.dispositionType != null) {
+
+      formData.put("disposition_type", this.dispositionType);
+    }
+
     return formData;
   }
 
@@ -32,14 +43,13 @@ public static CreditNotePdfBuilder builder() {
   }
 
   public static final class CreditNotePdfBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
+
+    private DispositionType dispositionType;
 
     private CreditNotePdfBuilder() {}
 
     public CreditNotePdfBuilder dispositionType(DispositionType value) {
-
-      formData.put("disposition_type", value);
-
+      this.dispositionType = value;
       return this;
     }
 
diff --git a/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteRecordRefundParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteRecordRefundParams.java
new file mode 100644
index 00000000..11735d89
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteRecordRefundParams.java
@@ -0,0 +1,294 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.creditNote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class CreditNoteRecordRefundParams {
+
+  private final String refundReasonCode;
+
+  private final String comment;
+
+  private final TransactionParams transaction;
+
+  private CreditNoteRecordRefundParams(CreditNoteRecordRefundBuilder builder) {
+
+    this.refundReasonCode = builder.refundReasonCode;
+
+    this.comment = builder.comment;
+
+    this.transaction = builder.transaction;
+  }
+
+  public String getRefundReasonCode() {
+    return refundReasonCode;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public TransactionParams getTransaction() {
+    return transaction;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.refundReasonCode != null) {
+
+      formData.put("refund_reason_code", this.refundReasonCode);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.transaction != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.transaction.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "transaction[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CreditNoteRecordRefundParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreditNoteRecordRefundBuilder builder() {
+    return new CreditNoteRecordRefundBuilder();
+  }
+
+  public static final class CreditNoteRecordRefundBuilder {
+
+    private String refundReasonCode;
+
+    private String comment;
+
+    private TransactionParams transaction;
+
+    private CreditNoteRecordRefundBuilder() {}
+
+    public CreditNoteRecordRefundBuilder refundReasonCode(String value) {
+      this.refundReasonCode = value;
+      return this;
+    }
+
+    public CreditNoteRecordRefundBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public CreditNoteRecordRefundBuilder transaction(TransactionParams value) {
+      this.transaction = value;
+      return this;
+    }
+
+    public CreditNoteRecordRefundParams build() {
+      return new CreditNoteRecordRefundParams(this);
+    }
+  }
+
+  public static final class TransactionParams {
+
+    private final String id;
+
+    private final Long amount;
+
+    private final PaymentMethod paymentMethod;
+
+    private final String referenceNumber;
+
+    private final String customPaymentMethodId;
+
+    private final Timestamp date;
+
+    private TransactionParams(TransactionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.amount = builder.amount;
+
+      this.paymentMethod = builder.paymentMethod;
+
+      this.referenceNumber = builder.referenceNumber;
+
+      this.customPaymentMethodId = builder.customPaymentMethodId;
+
+      this.date = builder.date;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public PaymentMethod getPaymentMethod() {
+      return paymentMethod;
+    }
+
+    public String getReferenceNumber() {
+      return referenceNumber;
+    }
+
+    public String getCustomPaymentMethodId() {
+      return customPaymentMethodId;
+    }
+
+    public Timestamp getDate() {
+      return date;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.paymentMethod != null) {
+
+        formData.put("payment_method", this.paymentMethod);
+      }
+
+      if (this.referenceNumber != null) {
+
+        formData.put("reference_number", this.referenceNumber);
+      }
+
+      if (this.customPaymentMethodId != null) {
+
+        formData.put("custom_payment_method_id", this.customPaymentMethodId);
+      }
+
+      if (this.date != null) {
+
+        formData.put("date", this.date);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TransactionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TransactionBuilder builder() {
+      return new TransactionBuilder();
+    }
+
+    public static final class TransactionBuilder {
+
+      private String id;
+
+      private Long amount;
+
+      private PaymentMethod paymentMethod;
+
+      private String referenceNumber;
+
+      private String customPaymentMethodId;
+
+      private Timestamp date;
+
+      private TransactionBuilder() {}
+
+      public TransactionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public TransactionBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public TransactionBuilder paymentMethod(PaymentMethod value) {
+        this.paymentMethod = value;
+        return this;
+      }
+
+      public TransactionBuilder referenceNumber(String value) {
+        this.referenceNumber = value;
+        return this;
+      }
+
+      public TransactionBuilder customPaymentMethodId(String value) {
+        this.customPaymentMethodId = value;
+        return this;
+      }
+
+      public TransactionBuilder date(Timestamp value) {
+        this.date = value;
+        return this;
+      }
+
+      public TransactionParams build() {
+        return new TransactionParams(this);
+      }
+    }
+
+    public enum PaymentMethod {
+      CASH("cash"),
+
+      CHECK("check"),
+
+      CHARGEBACK("chargeback"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      OTHER("other"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethod enumValue : PaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteRefundParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteRefundParams.java
new file mode 100644
index 00000000..f14f8f0c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteRefundParams.java
@@ -0,0 +1,100 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.creditNote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CreditNoteRefundParams {
+
+  private final Long refundAmount;
+
+  private final String customerNotes;
+
+  private final String refundReasonCode;
+
+  private CreditNoteRefundParams(CreditNoteRefundBuilder builder) {
+
+    this.refundAmount = builder.refundAmount;
+
+    this.customerNotes = builder.customerNotes;
+
+    this.refundReasonCode = builder.refundReasonCode;
+  }
+
+  public Long getRefundAmount() {
+    return refundAmount;
+  }
+
+  public String getCustomerNotes() {
+    return customerNotes;
+  }
+
+  public String getRefundReasonCode() {
+    return refundReasonCode;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.refundAmount != null) {
+
+      formData.put("refund_amount", this.refundAmount);
+    }
+
+    if (this.customerNotes != null) {
+
+      formData.put("customer_notes", this.customerNotes);
+    }
+
+    if (this.refundReasonCode != null) {
+
+      formData.put("refund_reason_code", this.refundReasonCode);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CreditNoteRefundParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreditNoteRefundBuilder builder() {
+    return new CreditNoteRefundBuilder();
+  }
+
+  public static final class CreditNoteRefundBuilder {
+
+    private Long refundAmount;
+
+    private String customerNotes;
+
+    private String refundReasonCode;
+
+    private CreditNoteRefundBuilder() {}
+
+    public CreditNoteRefundBuilder refundAmount(Long value) {
+      this.refundAmount = value;
+      return this;
+    }
+
+    public CreditNoteRefundBuilder customerNotes(String value) {
+      this.customerNotes = value;
+      return this;
+    }
+
+    public CreditNoteRefundBuilder refundReasonCode(String value) {
+      this.refundReasonCode = value;
+      return this;
+    }
+
+    public CreditNoteRefundParams build() {
+      return new CreditNoteRefundParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteRemoveTaxWithheldRefundParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteRemoveTaxWithheldRefundParams.java
new file mode 100644
index 00000000..636e0e20
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteRemoveTaxWithheldRefundParams.java
@@ -0,0 +1,114 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.creditNote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CreditNoteRemoveTaxWithheldRefundParams {
+
+  private final TaxWithheldParams taxWithheld;
+
+  private CreditNoteRemoveTaxWithheldRefundParams(
+      CreditNoteRemoveTaxWithheldRefundBuilder builder) {
+
+    this.taxWithheld = builder.taxWithheld;
+  }
+
+  public TaxWithheldParams getTaxWithheld() {
+    return taxWithheld;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.taxWithheld != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.taxWithheld.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "tax_withheld[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CreditNoteRemoveTaxWithheldRefundParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreditNoteRemoveTaxWithheldRefundBuilder builder() {
+    return new CreditNoteRemoveTaxWithheldRefundBuilder();
+  }
+
+  public static final class CreditNoteRemoveTaxWithheldRefundBuilder {
+
+    private TaxWithheldParams taxWithheld;
+
+    private CreditNoteRemoveTaxWithheldRefundBuilder() {}
+
+    public CreditNoteRemoveTaxWithheldRefundBuilder taxWithheld(TaxWithheldParams value) {
+      this.taxWithheld = value;
+      return this;
+    }
+
+    public CreditNoteRemoveTaxWithheldRefundParams build() {
+      return new CreditNoteRemoveTaxWithheldRefundParams(this);
+    }
+  }
+
+  public static final class TaxWithheldParams {
+
+    private final String id;
+
+    private TaxWithheldParams(TaxWithheldBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxWithheldParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxWithheldBuilder builder() {
+      return new TaxWithheldBuilder();
+    }
+
+    public static final class TaxWithheldBuilder {
+
+      private String id;
+
+      private TaxWithheldBuilder() {}
+
+      public TaxWithheldBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public TaxWithheldParams build() {
+        return new TaxWithheldParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteResendEinvoiceParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteResendEinvoiceParams.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteResendEinvoiceParams.java
rename to src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteResendEinvoiceParams.java
index 4fa0a29a..78b0473a 100644
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteResendEinvoiceParams.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteResendEinvoiceParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.creditNote.params;
+package com.chargebee.v4.models.creditNote.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class CreditNoteResendEinvoiceParams {
 
-  private final Map<String, Object> formData;
-
-  private CreditNoteResendEinvoiceParams(CreditNoteResendEinvoiceBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private CreditNoteResendEinvoiceParams(CreditNoteResendEinvoiceBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static CreditNoteResendEinvoiceBuilder builder() {
   }
 
   public static final class CreditNoteResendEinvoiceBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private CreditNoteResendEinvoiceBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteRetrieveParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteRetrieveParams.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteRetrieveParams.java
index e04fb538..dccaffdb 100644
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.creditNote.params;
+package com.chargebee.v4.models.creditNote.params;
 
 import com.chargebee.v4.internal.Recommended;
 
@@ -43,6 +43,16 @@ public static final class CreditNoteRetrieveBuilder {
 
     private CreditNoteRetrieveBuilder() {}
 
+    public CreditNoteRetrieveBuilder lineItemsLimit(Integer value) {
+      queryParams.put("line_items_limit", value);
+      return this;
+    }
+
+    public CreditNoteRetrieveBuilder lineItemsOffset(String value) {
+      queryParams.put("line_items_offset", value);
+      return this;
+    }
+
     @Deprecated
     public CreditNoteRetrieveBuilder lineItem(LineItemParams value) {
       queryParams.put("line_item", value);
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteSendEinvoiceParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteSendEinvoiceParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteSendEinvoiceParams.java
rename to src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteSendEinvoiceParams.java
index a7d247f6..51f6718f 100644
--- a/src/main/java/com/chargebee/v4/core/models/creditNote/params/CreditNoteSendEinvoiceParams.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNoteSendEinvoiceParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.creditNote.params;
+package com.chargebee.v4.models.creditNote.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class CreditNoteSendEinvoiceParams {
 
-  private final Map<String, Object> formData;
-
-  private CreditNoteSendEinvoiceParams(CreditNoteSendEinvoiceBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private CreditNoteSendEinvoiceParams(CreditNoteSendEinvoiceBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static CreditNoteSendEinvoiceBuilder builder() {
   }
 
   public static final class CreditNoteSendEinvoiceBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private CreditNoteSendEinvoiceBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNotesForCustomerParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNotesForCustomerParams.java
new file mode 100644
index 00000000..59254da9
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/CreditNotesForCustomerParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.creditNote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CreditNotesForCustomerParams {
+
+  private final Map<String, Object> queryParams;
+
+  private CreditNotesForCustomerParams(CreditNotesForCustomerBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public CreditNotesForCustomerBuilder toBuilder() {
+    CreditNotesForCustomerBuilder builder = new CreditNotesForCustomerBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for CreditNotesForCustomerParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreditNotesForCustomerBuilder builder() {
+    return new CreditNotesForCustomerBuilder();
+  }
+
+  public static final class CreditNotesForCustomerBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private CreditNotesForCustomerBuilder() {}
+
+    public CreditNotesForCustomerBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public CreditNotesForCustomerBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public CreditNotesForCustomerParams build() {
+      return new CreditNotesForCustomerParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/creditNote/params/ImportCreditNoteParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/ImportCreditNoteParams.java
new file mode 100644
index 00000000..fb4674d0
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/ImportCreditNoteParams.java
@@ -0,0 +1,2314 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.creditNote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class ImportCreditNoteParams {
+
+  private final String id;
+
+  private final String customerId;
+
+  private final String subscriptionId;
+
+  private final String referenceInvoiceId;
+
+  private final Type type;
+
+  private final String currencyCode;
+
+  private final String createReasonCode;
+
+  private final Timestamp date;
+
+  private final Status status;
+
+  private final Long total;
+
+  private final Timestamp refundedAt;
+
+  private final Timestamp voidedAt;
+
+  private final Long subTotal;
+
+  private final Long roundOffAmount;
+
+  private final Long fractionalCorrection;
+
+  private final String vatNumberPrefix;
+
+  private final List<LineItemsParams> lineItems;
+
+  private final List<LineItemTiersParams> lineItemTiers;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<TaxesParams> taxes;
+
+  private final List<AllocationsParams> allocations;
+
+  private final List<LinkedRefundsParams> linkedRefunds;
+
+  private final Map<String, String> customFields;
+
+  private ImportCreditNoteParams(ImportCreditNoteBuilder builder) {
+
+    this.id = builder.id;
+
+    this.customerId = builder.customerId;
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.referenceInvoiceId = builder.referenceInvoiceId;
+
+    this.type = builder.type;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.createReasonCode = builder.createReasonCode;
+
+    this.date = builder.date;
+
+    this.status = builder.status;
+
+    this.total = builder.total;
+
+    this.refundedAt = builder.refundedAt;
+
+    this.voidedAt = builder.voidedAt;
+
+    this.subTotal = builder.subTotal;
+
+    this.roundOffAmount = builder.roundOffAmount;
+
+    this.fractionalCorrection = builder.fractionalCorrection;
+
+    this.vatNumberPrefix = builder.vatNumberPrefix;
+
+    this.lineItems = builder.lineItems;
+
+    this.lineItemTiers = builder.lineItemTiers;
+
+    this.discounts = builder.discounts;
+
+    this.taxes = builder.taxes;
+
+    this.allocations = builder.allocations;
+
+    this.linkedRefunds = builder.linkedRefunds;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getReferenceInvoiceId() {
+    return referenceInvoiceId;
+  }
+
+  public Type getType() {
+    return type;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getCreateReasonCode() {
+    return createReasonCode;
+  }
+
+  public Timestamp getDate() {
+    return date;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public Long getTotal() {
+    return total;
+  }
+
+  public Timestamp getRefundedAt() {
+    return refundedAt;
+  }
+
+  public Timestamp getVoidedAt() {
+    return voidedAt;
+  }
+
+  public Long getSubTotal() {
+    return subTotal;
+  }
+
+  public Long getRoundOffAmount() {
+    return roundOffAmount;
+  }
+
+  public Long getFractionalCorrection() {
+    return fractionalCorrection;
+  }
+
+  public String getVatNumberPrefix() {
+    return vatNumberPrefix;
+  }
+
+  public List<LineItemsParams> getLineItems() {
+    return lineItems;
+  }
+
+  public List<LineItemTiersParams> getLineItemTiers() {
+    return lineItemTiers;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<TaxesParams> getTaxes() {
+    return taxes;
+  }
+
+  public List<AllocationsParams> getAllocations() {
+    return allocations;
+  }
+
+  public List<LinkedRefundsParams> getLinkedRefunds() {
+    return linkedRefunds;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.referenceInvoiceId != null) {
+
+      formData.put("reference_invoice_id", this.referenceInvoiceId);
+    }
+
+    if (this.type != null) {
+
+      formData.put("type", this.type);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.createReasonCode != null) {
+
+      formData.put("create_reason_code", this.createReasonCode);
+    }
+
+    if (this.date != null) {
+
+      formData.put("date", this.date);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.total != null) {
+
+      formData.put("total", this.total);
+    }
+
+    if (this.refundedAt != null) {
+
+      formData.put("refunded_at", this.refundedAt);
+    }
+
+    if (this.voidedAt != null) {
+
+      formData.put("voided_at", this.voidedAt);
+    }
+
+    if (this.subTotal != null) {
+
+      formData.put("sub_total", this.subTotal);
+    }
+
+    if (this.roundOffAmount != null) {
+
+      formData.put("round_off_amount", this.roundOffAmount);
+    }
+
+    if (this.fractionalCorrection != null) {
+
+      formData.put("fractional_correction", this.fractionalCorrection);
+    }
+
+    if (this.vatNumberPrefix != null) {
+
+      formData.put("vat_number_prefix", this.vatNumberPrefix);
+    }
+
+    if (this.lineItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.lineItems.size(); i++) {
+        LineItemsParams item = this.lineItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "line_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.lineItemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.lineItemTiers.size(); i++) {
+        LineItemTiersParams item = this.lineItemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "line_item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxes != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxes.size(); i++) {
+        TaxesParams item = this.taxes.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "taxes[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.allocations != null) {
+
+      // List of objects
+      for (int i = 0; i < this.allocations.size(); i++) {
+        AllocationsParams item = this.allocations.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "allocations[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.linkedRefunds != null) {
+
+      // List of objects
+      for (int i = 0; i < this.linkedRefunds.size(); i++) {
+        LinkedRefundsParams item = this.linkedRefunds.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "linked_refunds[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for ImportCreditNoteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ImportCreditNoteBuilder builder() {
+    return new ImportCreditNoteBuilder();
+  }
+
+  public static final class ImportCreditNoteBuilder {
+
+    private String id;
+
+    private String customerId;
+
+    private String subscriptionId;
+
+    private String referenceInvoiceId;
+
+    private Type type;
+
+    private String currencyCode;
+
+    private String createReasonCode;
+
+    private Timestamp date;
+
+    private Status status;
+
+    private Long total;
+
+    private Timestamp refundedAt;
+
+    private Timestamp voidedAt;
+
+    private Long subTotal;
+
+    private Long roundOffAmount;
+
+    private Long fractionalCorrection;
+
+    private String vatNumberPrefix;
+
+    private List<LineItemsParams> lineItems;
+
+    private List<LineItemTiersParams> lineItemTiers;
+
+    private List<DiscountsParams> discounts;
+
+    private List<TaxesParams> taxes;
+
+    private List<AllocationsParams> allocations;
+
+    private List<LinkedRefundsParams> linkedRefunds;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private ImportCreditNoteBuilder() {}
+
+    public ImportCreditNoteBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder referenceInvoiceId(String value) {
+      this.referenceInvoiceId = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder type(Type value) {
+      this.type = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder createReasonCode(String value) {
+      this.createReasonCode = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder date(Timestamp value) {
+      this.date = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder total(Long value) {
+      this.total = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder refundedAt(Timestamp value) {
+      this.refundedAt = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder voidedAt(Timestamp value) {
+      this.voidedAt = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder subTotal(Long value) {
+      this.subTotal = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder roundOffAmount(Long value) {
+      this.roundOffAmount = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder fractionalCorrection(Long value) {
+      this.fractionalCorrection = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder vatNumberPrefix(String value) {
+      this.vatNumberPrefix = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder lineItems(List<LineItemsParams> value) {
+      this.lineItems = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder lineItemTiers(List<LineItemTiersParams> value) {
+      this.lineItemTiers = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder taxes(List<TaxesParams> value) {
+      this.taxes = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder allocations(List<AllocationsParams> value) {
+      this.allocations = value;
+      return this;
+    }
+
+    public ImportCreditNoteBuilder linkedRefunds(List<LinkedRefundsParams> value) {
+      this.linkedRefunds = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public ImportCreditNoteBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public ImportCreditNoteBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public ImportCreditNoteParams build() {
+      return new ImportCreditNoteParams(this);
+    }
+  }
+
+  public enum Type {
+    ADJUSTMENT("adjustment"),
+
+    REFUNDABLE("refundable"),
+
+    STORE("store"),
+
+    /** An enum member indicating that Type was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Type(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Type fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Type enumValue : Type.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Status {
+    ADJUSTED("adjusted"),
+
+    REFUNDED("refunded"),
+
+    REFUND_DUE("refund_due"),
+
+    VOIDED("voided"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class LineItemsParams {
+
+    private final String referenceLineItemId;
+
+    private final String id;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private final String subscriptionId;
+
+    private final String description;
+
+    private final Long unitAmount;
+
+    private final Integer quantity;
+
+    private final Long amount;
+
+    private final String unitAmountInDecimal;
+
+    private final String quantityInDecimal;
+
+    private final String amountInDecimal;
+
+    private final EntityType entityType;
+
+    private final String entityId;
+
+    private final String itemLevelDiscount1EntityId;
+
+    private final Long itemLevelDiscount1Amount;
+
+    private final String itemLevelDiscount2EntityId;
+
+    private final Long itemLevelDiscount2Amount;
+
+    private final String tax1Name;
+
+    private final Long tax1Amount;
+
+    private final String tax2Name;
+
+    private final Long tax2Amount;
+
+    private final String tax3Name;
+
+    private final Long tax3Amount;
+
+    private final String tax4Name;
+
+    private final Long tax4Amount;
+
+    private final String tax5Name;
+
+    private final Long tax5Amount;
+
+    private final String tax6Name;
+
+    private final Long tax6Amount;
+
+    private final String tax7Name;
+
+    private final Long tax7Amount;
+
+    private final String tax8Name;
+
+    private final Long tax8Amount;
+
+    private final String tax9Name;
+
+    private final Long tax9Amount;
+
+    private final String tax10Name;
+
+    private final Long tax10Amount;
+
+    private LineItemsParams(LineItemsBuilder builder) {
+
+      this.referenceLineItemId = builder.referenceLineItemId;
+
+      this.id = builder.id;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+
+      this.subscriptionId = builder.subscriptionId;
+
+      this.description = builder.description;
+
+      this.unitAmount = builder.unitAmount;
+
+      this.quantity = builder.quantity;
+
+      this.amount = builder.amount;
+
+      this.unitAmountInDecimal = builder.unitAmountInDecimal;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.entityType = builder.entityType;
+
+      this.entityId = builder.entityId;
+
+      this.itemLevelDiscount1EntityId = builder.itemLevelDiscount1EntityId;
+
+      this.itemLevelDiscount1Amount = builder.itemLevelDiscount1Amount;
+
+      this.itemLevelDiscount2EntityId = builder.itemLevelDiscount2EntityId;
+
+      this.itemLevelDiscount2Amount = builder.itemLevelDiscount2Amount;
+
+      this.tax1Name = builder.tax1Name;
+
+      this.tax1Amount = builder.tax1Amount;
+
+      this.tax2Name = builder.tax2Name;
+
+      this.tax2Amount = builder.tax2Amount;
+
+      this.tax3Name = builder.tax3Name;
+
+      this.tax3Amount = builder.tax3Amount;
+
+      this.tax4Name = builder.tax4Name;
+
+      this.tax4Amount = builder.tax4Amount;
+
+      this.tax5Name = builder.tax5Name;
+
+      this.tax5Amount = builder.tax5Amount;
+
+      this.tax6Name = builder.tax6Name;
+
+      this.tax6Amount = builder.tax6Amount;
+
+      this.tax7Name = builder.tax7Name;
+
+      this.tax7Amount = builder.tax7Amount;
+
+      this.tax8Name = builder.tax8Name;
+
+      this.tax8Amount = builder.tax8Amount;
+
+      this.tax9Name = builder.tax9Name;
+
+      this.tax9Amount = builder.tax9Amount;
+
+      this.tax10Name = builder.tax10Name;
+
+      this.tax10Amount = builder.tax10Amount;
+    }
+
+    public String getReferenceLineItemId() {
+      return referenceLineItemId;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    public String getSubscriptionId() {
+      return subscriptionId;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Long getUnitAmount() {
+      return unitAmount;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getUnitAmountInDecimal() {
+      return unitAmountInDecimal;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    public String getItemLevelDiscount1EntityId() {
+      return itemLevelDiscount1EntityId;
+    }
+
+    public Long getItemLevelDiscount1Amount() {
+      return itemLevelDiscount1Amount;
+    }
+
+    public String getItemLevelDiscount2EntityId() {
+      return itemLevelDiscount2EntityId;
+    }
+
+    public Long getItemLevelDiscount2Amount() {
+      return itemLevelDiscount2Amount;
+    }
+
+    public String getTax1Name() {
+      return tax1Name;
+    }
+
+    public Long getTax1Amount() {
+      return tax1Amount;
+    }
+
+    public String getTax2Name() {
+      return tax2Name;
+    }
+
+    public Long getTax2Amount() {
+      return tax2Amount;
+    }
+
+    public String getTax3Name() {
+      return tax3Name;
+    }
+
+    public Long getTax3Amount() {
+      return tax3Amount;
+    }
+
+    public String getTax4Name() {
+      return tax4Name;
+    }
+
+    public Long getTax4Amount() {
+      return tax4Amount;
+    }
+
+    public String getTax5Name() {
+      return tax5Name;
+    }
+
+    public Long getTax5Amount() {
+      return tax5Amount;
+    }
+
+    public String getTax6Name() {
+      return tax6Name;
+    }
+
+    public Long getTax6Amount() {
+      return tax6Amount;
+    }
+
+    public String getTax7Name() {
+      return tax7Name;
+    }
+
+    public Long getTax7Amount() {
+      return tax7Amount;
+    }
+
+    public String getTax8Name() {
+      return tax8Name;
+    }
+
+    public Long getTax8Amount() {
+      return tax8Amount;
+    }
+
+    public String getTax9Name() {
+      return tax9Name;
+    }
+
+    public Long getTax9Amount() {
+      return tax9Amount;
+    }
+
+    public String getTax10Name() {
+      return tax10Name;
+    }
+
+    public Long getTax10Amount() {
+      return tax10Amount;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.referenceLineItemId != null) {
+
+        formData.put("reference_line_item_id", this.referenceLineItemId);
+      }
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      if (this.subscriptionId != null) {
+
+        formData.put("subscription_id", this.subscriptionId);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.unitAmount != null) {
+
+        formData.put("unit_amount", this.unitAmount);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.unitAmountInDecimal != null) {
+
+        formData.put("unit_amount_in_decimal", this.unitAmountInDecimal);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      if (this.itemLevelDiscount1EntityId != null) {
+
+        formData.put("item_level_discount1_entity_id", this.itemLevelDiscount1EntityId);
+      }
+
+      if (this.itemLevelDiscount1Amount != null) {
+
+        formData.put("item_level_discount1_amount", this.itemLevelDiscount1Amount);
+      }
+
+      if (this.itemLevelDiscount2EntityId != null) {
+
+        formData.put("item_level_discount2_entity_id", this.itemLevelDiscount2EntityId);
+      }
+
+      if (this.itemLevelDiscount2Amount != null) {
+
+        formData.put("item_level_discount2_amount", this.itemLevelDiscount2Amount);
+      }
+
+      if (this.tax1Name != null) {
+
+        formData.put("tax1_name", this.tax1Name);
+      }
+
+      if (this.tax1Amount != null) {
+
+        formData.put("tax1_amount", this.tax1Amount);
+      }
+
+      if (this.tax2Name != null) {
+
+        formData.put("tax2_name", this.tax2Name);
+      }
+
+      if (this.tax2Amount != null) {
+
+        formData.put("tax2_amount", this.tax2Amount);
+      }
+
+      if (this.tax3Name != null) {
+
+        formData.put("tax3_name", this.tax3Name);
+      }
+
+      if (this.tax3Amount != null) {
+
+        formData.put("tax3_amount", this.tax3Amount);
+      }
+
+      if (this.tax4Name != null) {
+
+        formData.put("tax4_name", this.tax4Name);
+      }
+
+      if (this.tax4Amount != null) {
+
+        formData.put("tax4_amount", this.tax4Amount);
+      }
+
+      if (this.tax5Name != null) {
+
+        formData.put("tax5_name", this.tax5Name);
+      }
+
+      if (this.tax5Amount != null) {
+
+        formData.put("tax5_amount", this.tax5Amount);
+      }
+
+      if (this.tax6Name != null) {
+
+        formData.put("tax6_name", this.tax6Name);
+      }
+
+      if (this.tax6Amount != null) {
+
+        formData.put("tax6_amount", this.tax6Amount);
+      }
+
+      if (this.tax7Name != null) {
+
+        formData.put("tax7_name", this.tax7Name);
+      }
+
+      if (this.tax7Amount != null) {
+
+        formData.put("tax7_amount", this.tax7Amount);
+      }
+
+      if (this.tax8Name != null) {
+
+        formData.put("tax8_name", this.tax8Name);
+      }
+
+      if (this.tax8Amount != null) {
+
+        formData.put("tax8_amount", this.tax8Amount);
+      }
+
+      if (this.tax9Name != null) {
+
+        formData.put("tax9_name", this.tax9Name);
+      }
+
+      if (this.tax9Amount != null) {
+
+        formData.put("tax9_amount", this.tax9Amount);
+      }
+
+      if (this.tax10Name != null) {
+
+        formData.put("tax10_name", this.tax10Name);
+      }
+
+      if (this.tax10Amount != null) {
+
+        formData.put("tax10_amount", this.tax10Amount);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LineItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LineItemsBuilder builder() {
+      return new LineItemsBuilder();
+    }
+
+    public static final class LineItemsBuilder {
+
+      private String referenceLineItemId;
+
+      private String id;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private String subscriptionId;
+
+      private String description;
+
+      private Long unitAmount;
+
+      private Integer quantity;
+
+      private Long amount;
+
+      private String unitAmountInDecimal;
+
+      private String quantityInDecimal;
+
+      private String amountInDecimal;
+
+      private EntityType entityType;
+
+      private String entityId;
+
+      private String itemLevelDiscount1EntityId;
+
+      private Long itemLevelDiscount1Amount;
+
+      private String itemLevelDiscount2EntityId;
+
+      private Long itemLevelDiscount2Amount;
+
+      private String tax1Name;
+
+      private Long tax1Amount;
+
+      private String tax2Name;
+
+      private Long tax2Amount;
+
+      private String tax3Name;
+
+      private Long tax3Amount;
+
+      private String tax4Name;
+
+      private Long tax4Amount;
+
+      private String tax5Name;
+
+      private Long tax5Amount;
+
+      private String tax6Name;
+
+      private Long tax6Amount;
+
+      private String tax7Name;
+
+      private Long tax7Amount;
+
+      private String tax8Name;
+
+      private Long tax8Amount;
+
+      private String tax9Name;
+
+      private Long tax9Amount;
+
+      private String tax10Name;
+
+      private Long tax10Amount;
+
+      private LineItemsBuilder() {}
+
+      public LineItemsBuilder referenceLineItemId(String value) {
+        this.referenceLineItemId = value;
+        return this;
+      }
+
+      public LineItemsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public LineItemsBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public LineItemsBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public LineItemsBuilder subscriptionId(String value) {
+        this.subscriptionId = value;
+        return this;
+      }
+
+      public LineItemsBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public LineItemsBuilder unitAmount(Long value) {
+        this.unitAmount = value;
+        return this;
+      }
+
+      public LineItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public LineItemsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder unitAmountInDecimal(String value) {
+        this.unitAmountInDecimal = value;
+        return this;
+      }
+
+      public LineItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public LineItemsBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public LineItemsBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public LineItemsBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public LineItemsBuilder itemLevelDiscount1EntityId(String value) {
+        this.itemLevelDiscount1EntityId = value;
+        return this;
+      }
+
+      public LineItemsBuilder itemLevelDiscount1Amount(Long value) {
+        this.itemLevelDiscount1Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder itemLevelDiscount2EntityId(String value) {
+        this.itemLevelDiscount2EntityId = value;
+        return this;
+      }
+
+      public LineItemsBuilder itemLevelDiscount2Amount(Long value) {
+        this.itemLevelDiscount2Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax1Name(String value) {
+        this.tax1Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax1Amount(Long value) {
+        this.tax1Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax2Name(String value) {
+        this.tax2Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax2Amount(Long value) {
+        this.tax2Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax3Name(String value) {
+        this.tax3Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax3Amount(Long value) {
+        this.tax3Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax4Name(String value) {
+        this.tax4Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax4Amount(Long value) {
+        this.tax4Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax5Name(String value) {
+        this.tax5Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax5Amount(Long value) {
+        this.tax5Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax6Name(String value) {
+        this.tax6Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax6Amount(Long value) {
+        this.tax6Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax7Name(String value) {
+        this.tax7Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax7Amount(Long value) {
+        this.tax7Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax8Name(String value) {
+        this.tax8Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax8Amount(Long value) {
+        this.tax8Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax9Name(String value) {
+        this.tax9Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax9Amount(Long value) {
+        this.tax9Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax10Name(String value) {
+        this.tax10Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax10Amount(Long value) {
+        this.tax10Amount = value;
+        return this;
+      }
+
+      public LineItemsParams build() {
+        return new LineItemsParams(this);
+      }
+    }
+
+    public enum EntityType {
+      ADHOC("adhoc"),
+
+      PLAN_ITEM_PRICE("plan_item_price"),
+
+      ADDON_ITEM_PRICE("addon_item_price"),
+
+      CHARGE_ITEM_PRICE("charge_item_price"),
+
+      PLAN_SETUP("plan_setup"),
+
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class LineItemTiersParams {
+
+    private final String lineItemId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Integer quantityUsed;
+
+    private final Long unitAmount;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String quantityUsedInDecimal;
+
+    private final String unitAmountInDecimal;
+
+    private LineItemTiersParams(LineItemTiersBuilder builder) {
+
+      this.lineItemId = builder.lineItemId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.quantityUsed = builder.quantityUsed;
+
+      this.unitAmount = builder.unitAmount;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.quantityUsedInDecimal = builder.quantityUsedInDecimal;
+
+      this.unitAmountInDecimal = builder.unitAmountInDecimal;
+    }
+
+    public String getLineItemId() {
+      return lineItemId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Integer getQuantityUsed() {
+      return quantityUsed;
+    }
+
+    public Long getUnitAmount() {
+      return unitAmount;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getQuantityUsedInDecimal() {
+      return quantityUsedInDecimal;
+    }
+
+    public String getUnitAmountInDecimal() {
+      return unitAmountInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.lineItemId != null) {
+
+        formData.put("line_item_id", this.lineItemId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.quantityUsed != null) {
+
+        formData.put("quantity_used", this.quantityUsed);
+      }
+
+      if (this.unitAmount != null) {
+
+        formData.put("unit_amount", this.unitAmount);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.quantityUsedInDecimal != null) {
+
+        formData.put("quantity_used_in_decimal", this.quantityUsedInDecimal);
+      }
+
+      if (this.unitAmountInDecimal != null) {
+
+        formData.put("unit_amount_in_decimal", this.unitAmountInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LineItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LineItemTiersBuilder builder() {
+      return new LineItemTiersBuilder();
+    }
+
+    public static final class LineItemTiersBuilder {
+
+      private String lineItemId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Integer quantityUsed;
+
+      private Long unitAmount;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String quantityUsedInDecimal;
+
+      private String unitAmountInDecimal;
+
+      private LineItemTiersBuilder() {}
+
+      public LineItemTiersBuilder lineItemId(String value) {
+        this.lineItemId = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder quantityUsed(Integer value) {
+        this.quantityUsed = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder unitAmount(Long value) {
+        this.unitAmount = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder quantityUsedInDecimal(String value) {
+        this.quantityUsedInDecimal = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder unitAmountInDecimal(String value) {
+        this.unitAmountInDecimal = value;
+        return this;
+      }
+
+      public LineItemTiersParams build() {
+        return new LineItemTiersParams(this);
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final String lineItemId;
+
+    private final EntityType entityType;
+
+    private final String entityId;
+
+    private final String description;
+
+    private final Long amount;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.lineItemId = builder.lineItemId;
+
+      this.entityType = builder.entityType;
+
+      this.entityId = builder.entityId;
+
+      this.description = builder.description;
+
+      this.amount = builder.amount;
+    }
+
+    public String getLineItemId() {
+      return lineItemId;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.lineItemId != null) {
+
+        formData.put("line_item_id", this.lineItemId);
+      }
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private String lineItemId;
+
+      private EntityType entityType;
+
+      private String entityId;
+
+      private String description;
+
+      private Long amount;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder lineItemId(String value) {
+        this.lineItemId = value;
+        return this;
+      }
+
+      public DiscountsBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public DiscountsBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public DiscountsBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum EntityType {
+      ITEM_LEVEL_COUPON("item_level_coupon"),
+
+      DOCUMENT_LEVEL_COUPON("document_level_coupon"),
+
+      PROMOTIONAL_CREDITS("promotional_credits"),
+
+      ITEM_LEVEL_DISCOUNT("item_level_discount"),
+
+      DOCUMENT_LEVEL_DISCOUNT("document_level_discount"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxesParams {
+
+    private final String name;
+
+    private final Number rate;
+
+    private final Long amount;
+
+    private final String description;
+
+    private final JurisType jurisType;
+
+    private final String jurisName;
+
+    private final String jurisCode;
+
+    private TaxesParams(TaxesBuilder builder) {
+
+      this.name = builder.name;
+
+      this.rate = builder.rate;
+
+      this.amount = builder.amount;
+
+      this.description = builder.description;
+
+      this.jurisType = builder.jurisType;
+
+      this.jurisName = builder.jurisName;
+
+      this.jurisCode = builder.jurisCode;
+    }
+
+    public String getName() {
+      return name;
+    }
+
+    public Number getRate() {
+      return rate;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public JurisType getJurisType() {
+      return jurisType;
+    }
+
+    public String getJurisName() {
+      return jurisName;
+    }
+
+    public String getJurisCode() {
+      return jurisCode;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.name != null) {
+
+        formData.put("name", this.name);
+      }
+
+      if (this.rate != null) {
+
+        formData.put("rate", this.rate);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.jurisType != null) {
+
+        formData.put("juris_type", this.jurisType);
+      }
+
+      if (this.jurisName != null) {
+
+        formData.put("juris_name", this.jurisName);
+      }
+
+      if (this.jurisCode != null) {
+
+        formData.put("juris_code", this.jurisCode);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxesBuilder builder() {
+      return new TaxesBuilder();
+    }
+
+    public static final class TaxesBuilder {
+
+      private String name;
+
+      private Number rate;
+
+      private Long amount;
+
+      private String description;
+
+      private JurisType jurisType;
+
+      private String jurisName;
+
+      private String jurisCode;
+
+      private TaxesBuilder() {}
+
+      public TaxesBuilder name(String value) {
+        this.name = value;
+        return this;
+      }
+
+      public TaxesBuilder rate(Number value) {
+        this.rate = value;
+        return this;
+      }
+
+      public TaxesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public TaxesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public TaxesBuilder jurisType(JurisType value) {
+        this.jurisType = value;
+        return this;
+      }
+
+      public TaxesBuilder jurisName(String value) {
+        this.jurisName = value;
+        return this;
+      }
+
+      public TaxesBuilder jurisCode(String value) {
+        this.jurisCode = value;
+        return this;
+      }
+
+      public TaxesParams build() {
+        return new TaxesParams(this);
+      }
+    }
+
+    public enum JurisType {
+      COUNTRY("country"),
+
+      FEDERAL("federal"),
+
+      STATE("state"),
+
+      COUNTY("county"),
+
+      CITY("city"),
+
+      SPECIAL("special"),
+
+      UNINCORPORATED("unincorporated"),
+
+      OTHER("other"),
+
+      /** An enum member indicating that JurisType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      JurisType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static JurisType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (JurisType enumValue : JurisType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AllocationsParams {
+
+    private final String invoiceId;
+
+    private final Long allocatedAmount;
+
+    private final Timestamp allocatedAt;
+
+    private AllocationsParams(AllocationsBuilder builder) {
+
+      this.invoiceId = builder.invoiceId;
+
+      this.allocatedAmount = builder.allocatedAmount;
+
+      this.allocatedAt = builder.allocatedAt;
+    }
+
+    public String getInvoiceId() {
+      return invoiceId;
+    }
+
+    public Long getAllocatedAmount() {
+      return allocatedAmount;
+    }
+
+    public Timestamp getAllocatedAt() {
+      return allocatedAt;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.invoiceId != null) {
+
+        formData.put("invoice_id", this.invoiceId);
+      }
+
+      if (this.allocatedAmount != null) {
+
+        formData.put("allocated_amount", this.allocatedAmount);
+      }
+
+      if (this.allocatedAt != null) {
+
+        formData.put("allocated_at", this.allocatedAt);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AllocationsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AllocationsBuilder builder() {
+      return new AllocationsBuilder();
+    }
+
+    public static final class AllocationsBuilder {
+
+      private String invoiceId;
+
+      private Long allocatedAmount;
+
+      private Timestamp allocatedAt;
+
+      private AllocationsBuilder() {}
+
+      public AllocationsBuilder invoiceId(String value) {
+        this.invoiceId = value;
+        return this;
+      }
+
+      public AllocationsBuilder allocatedAmount(Long value) {
+        this.allocatedAmount = value;
+        return this;
+      }
+
+      public AllocationsBuilder allocatedAt(Timestamp value) {
+        this.allocatedAt = value;
+        return this;
+      }
+
+      public AllocationsParams build() {
+        return new AllocationsParams(this);
+      }
+    }
+  }
+
+  public static final class LinkedRefundsParams {
+
+    private final String id;
+
+    private final Long amount;
+
+    private final PaymentMethod paymentMethod;
+
+    private final Timestamp date;
+
+    private final String referenceNumber;
+
+    private LinkedRefundsParams(LinkedRefundsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.amount = builder.amount;
+
+      this.paymentMethod = builder.paymentMethod;
+
+      this.date = builder.date;
+
+      this.referenceNumber = builder.referenceNumber;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public PaymentMethod getPaymentMethod() {
+      return paymentMethod;
+    }
+
+    public Timestamp getDate() {
+      return date;
+    }
+
+    public String getReferenceNumber() {
+      return referenceNumber;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.paymentMethod != null) {
+
+        formData.put("payment_method", this.paymentMethod);
+      }
+
+      if (this.date != null) {
+
+        formData.put("date", this.date);
+      }
+
+      if (this.referenceNumber != null) {
+
+        formData.put("reference_number", this.referenceNumber);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LinkedRefundsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LinkedRefundsBuilder builder() {
+      return new LinkedRefundsBuilder();
+    }
+
+    public static final class LinkedRefundsBuilder {
+
+      private String id;
+
+      private Long amount;
+
+      private PaymentMethod paymentMethod;
+
+      private Timestamp date;
+
+      private String referenceNumber;
+
+      private LinkedRefundsBuilder() {}
+
+      public LinkedRefundsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public LinkedRefundsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public LinkedRefundsBuilder paymentMethod(PaymentMethod value) {
+        this.paymentMethod = value;
+        return this;
+      }
+
+      public LinkedRefundsBuilder date(Timestamp value) {
+        this.date = value;
+        return this;
+      }
+
+      public LinkedRefundsBuilder referenceNumber(String value) {
+        this.referenceNumber = value;
+        return this;
+      }
+
+      public LinkedRefundsParams build() {
+        return new LinkedRefundsParams(this);
+      }
+    }
+
+    public enum PaymentMethod {
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      OTHER("other"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethod enumValue : PaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/creditNote/params/VoidCreditNoteParams.java b/src/main/java/com/chargebee/v4/models/creditNote/params/VoidCreditNoteParams.java
new file mode 100644
index 00000000..aa5cfd4a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/creditNote/params/VoidCreditNoteParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.creditNote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class VoidCreditNoteParams {
+
+  private final String comment;
+
+  private VoidCreditNoteParams(VoidCreditNoteBuilder builder) {
+
+    this.comment = builder.comment;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for VoidCreditNoteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static VoidCreditNoteBuilder builder() {
+    return new VoidCreditNoteBuilder();
+  }
+
+  public static final class VoidCreditNoteBuilder {
+
+    private String comment;
+
+    private VoidCreditNoteBuilder() {}
+
+    public VoidCreditNoteBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public VoidCreditNoteParams build() {
+      return new VoidCreditNoteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteCreateResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteCreateResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteCreateResponse.java
index fdca7659..7949b68e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteCreateResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.creditNote;
+package com.chargebee.v4.models.creditNote.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteDeleteResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteDeleteResponse.java
index f296cc0c..0705443b 100644
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.creditNote;
+package com.chargebee.v4.models.creditNote.responses;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteDownloadEinvoiceResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteDownloadEinvoiceResponse.java
new file mode 100644
index 00000000..a1d48950
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteDownloadEinvoiceResponse.java
@@ -0,0 +1,81 @@
+package com.chargebee.v4.models.creditNote.responses;
+
+import com.chargebee.v4.models.download.Download;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import java.util.List;
+
+/**
+ * Immutable response object for CreditNoteDownloadEinvoice operation. Contains the response data
+ * from a single resource get operation.
+ */
+public final class CreditNoteDownloadEinvoiceResponse extends BaseResponse {
+  private final List<Download> downloads;
+
+  private CreditNoteDownloadEinvoiceResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.downloads = builder.downloads;
+  }
+
+  /** Parse JSON response into CreditNoteDownloadEinvoiceResponse object. */
+  public static CreditNoteDownloadEinvoiceResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CreditNoteDownloadEinvoiceResponse object with HTTP response. */
+  public static CreditNoteDownloadEinvoiceResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __downloadsJson = JsonUtil.getArray(json, "downloads");
+      if (__downloadsJson != null) {
+        builder.downloads(
+            JsonUtil.parseObjectArray(__downloadsJson).stream()
+                .map(Download::fromJson)
+                .collect(java.util.stream.Collectors.toList()));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CreditNoteDownloadEinvoiceResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CreditNoteDownloadEinvoiceResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CreditNoteDownloadEinvoiceResponse. */
+  public static class Builder {
+
+    private List<Download> downloads;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder downloads(List<Download> downloads) {
+      this.downloads = downloads;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CreditNoteDownloadEinvoiceResponse build() {
+      return new CreditNoteDownloadEinvoiceResponse(this);
+    }
+  }
+
+  /** Get the downloads from the response. */
+  public List<Download> getDownloads() {
+    return downloads;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteListResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteListResponse.java
rename to src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteListResponse.java
index aba68f41..ab551b5e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.creditNote;
+package com.chargebee.v4.models.creditNote.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.CreditNoteService;
-import com.chargebee.v4.core.models.creditNote.params.CreditNoteListParams;
+import com.chargebee.v4.services.CreditNoteService;
+import com.chargebee.v4.models.creditNote.params.CreditNoteListParams;
 
 /** Immutable response object for CreditNoteList operation. Contains paginated list data. */
 public final class CreditNoteListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public CreditNoteListResponse nextPage() throws Exception {
+  public CreditNoteListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNotePdfResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNotePdfResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNotePdfResponse.java
rename to src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNotePdfResponse.java
index a4df5cb1..92f0b245 100644
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNotePdfResponse.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNotePdfResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.creditNote;
+package com.chargebee.v4.models.creditNote.responses;
 
-import com.chargebee.v4.core.models.download.Download;
+import com.chargebee.v4.models.download.Download;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteRecordRefundResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteRecordRefundResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteRecordRefundResponse.java
rename to src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteRecordRefundResponse.java
index 938d1c03..aeedefe4 100644
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteRecordRefundResponse.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteRecordRefundResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.creditNote;
+package com.chargebee.v4.models.creditNote.responses;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteRefundResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteRefundResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteRefundResponse.java
rename to src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteRefundResponse.java
index 3a2b00ac..0e0bc07b 100644
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteRefundResponse.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteRefundResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.creditNote;
+package com.chargebee.v4.models.creditNote.responses;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteRemoveTaxWithheldRefundResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteRemoveTaxWithheldRefundResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteRemoveTaxWithheldRefundResponse.java
rename to src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteRemoveTaxWithheldRefundResponse.java
index 3125a0bc..bf969c87 100644
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteRemoveTaxWithheldRefundResponse.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteRemoveTaxWithheldRefundResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.creditNote;
+package com.chargebee.v4.models.creditNote.responses;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteResendEinvoiceResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteResendEinvoiceResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteResendEinvoiceResponse.java
rename to src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteResendEinvoiceResponse.java
index a0462871..2816ac78 100644
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteResendEinvoiceResponse.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteResendEinvoiceResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.creditNote;
+package com.chargebee.v4.models.creditNote.responses;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteRetrieveResponse.java
new file mode 100644
index 00000000..85b8635a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.creditNote.responses;
+
+import com.chargebee.v4.models.creditNote.CreditNote;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CreditNoteRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class CreditNoteRetrieveResponse extends BaseResponse {
+  private final CreditNote creditNote;
+
+  private CreditNoteRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.creditNote = builder.creditNote;
+  }
+
+  /** Parse JSON response into CreditNoteRetrieveResponse object. */
+  public static CreditNoteRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CreditNoteRetrieveResponse object with HTTP response. */
+  public static CreditNoteRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __creditNoteJson = JsonUtil.getObject(json, "credit_note");
+      if (__creditNoteJson != null) {
+        builder.creditNote(CreditNote.fromJson(__creditNoteJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CreditNoteRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CreditNoteRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CreditNoteRetrieveResponse. */
+  public static class Builder {
+
+    private CreditNote creditNote;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder creditNote(CreditNote creditNote) {
+      this.creditNote = creditNote;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CreditNoteRetrieveResponse build() {
+      return new CreditNoteRetrieveResponse(this);
+    }
+  }
+
+  /** Get the creditNote from the response. */
+  public CreditNote getCreditNote() {
+    return creditNote;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteSendEinvoiceResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteSendEinvoiceResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteSendEinvoiceResponse.java
rename to src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteSendEinvoiceResponse.java
index 2b6c7cc9..6027f5f7 100644
--- a/src/main/java/com/chargebee/v4/core/responses/creditNote/CreditNoteSendEinvoiceResponse.java
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteSendEinvoiceResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.creditNote;
+package com.chargebee.v4.models.creditNote.responses;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNotesForCustomerResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNotesForCustomerResponse.java
new file mode 100644
index 00000000..cc363915
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/CreditNotesForCustomerResponse.java
@@ -0,0 +1,174 @@
+package com.chargebee.v4.models.creditNote.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.creditNote.CreditNote;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.CreditNoteService;
+import com.chargebee.v4.models.creditNote.params.CreditNotesForCustomerParams;
+
+/** Immutable response object for CreditNotesForCustomer operation. Contains paginated list data. */
+public final class CreditNotesForCustomerResponse {
+
+  private final List<CreditNoteCreditNotesForCustomerItem> list;
+
+  private final String nextOffset;
+
+  private final String customerId;
+
+  private final CreditNoteService service;
+  private final CreditNotesForCustomerParams originalParams;
+  private final Response httpResponse;
+
+  private CreditNotesForCustomerResponse(
+      List<CreditNoteCreditNotesForCustomerItem> list,
+      String nextOffset,
+      String customerId,
+      CreditNoteService service,
+      CreditNotesForCustomerParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.customerId = customerId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into CreditNotesForCustomerResponse object (no service context). Use this
+   * when you only need to read a single page (no nextPage()).
+   */
+  public static CreditNotesForCustomerResponse fromJson(String json) {
+    try {
+
+      List<CreditNoteCreditNotesForCustomerItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(CreditNoteCreditNotesForCustomerItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new CreditNotesForCustomerResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CreditNotesForCustomerResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into CreditNotesForCustomerResponse object with service context for
+   * pagination (enables nextPage()).
+   */
+  public static CreditNotesForCustomerResponse fromJson(
+      String json,
+      CreditNoteService service,
+      CreditNotesForCustomerParams originalParams,
+      String customerId,
+      Response httpResponse) {
+    try {
+
+      List<CreditNoteCreditNotesForCustomerItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(CreditNoteCreditNotesForCustomerItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new CreditNotesForCustomerResponse(
+          list, nextOffset, customerId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CreditNotesForCustomerResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<CreditNoteCreditNotesForCustomerItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public CreditNotesForCustomerResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    CreditNotesForCustomerParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : CreditNotesForCustomerParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.creditNotesForCustomer(customerId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class CreditNoteCreditNotesForCustomerItem {
+
+    private CreditNote creditNote;
+
+    public CreditNote getCreditNote() {
+      return creditNote;
+    }
+
+    public static CreditNoteCreditNotesForCustomerItem fromJson(String json) {
+      CreditNoteCreditNotesForCustomerItem item = new CreditNoteCreditNotesForCustomerItem();
+
+      String __creditNoteJson = JsonUtil.getObject(json, "credit_note");
+      if (__creditNoteJson != null) {
+        item.creditNote = CreditNote.fromJson(__creditNoteJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/creditNote/responses/ImportCreditNoteResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/ImportCreditNoteResponse.java
new file mode 100644
index 00000000..e88f4033
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/ImportCreditNoteResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.creditNote.responses;
+
+import com.chargebee.v4.models.creditNote.CreditNote;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ImportCreditNote operation. Contains the response data from the
+ * API.
+ */
+public final class ImportCreditNoteResponse extends BaseResponse {
+  private final CreditNote creditNote;
+
+  private ImportCreditNoteResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.creditNote = builder.creditNote;
+  }
+
+  /** Parse JSON response into ImportCreditNoteResponse object. */
+  public static ImportCreditNoteResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ImportCreditNoteResponse object with HTTP response. */
+  public static ImportCreditNoteResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __creditNoteJson = JsonUtil.getObject(json, "credit_note");
+      if (__creditNoteJson != null) {
+        builder.creditNote(CreditNote.fromJson(__creditNoteJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ImportCreditNoteResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ImportCreditNoteResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ImportCreditNoteResponse. */
+  public static class Builder {
+
+    private CreditNote creditNote;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder creditNote(CreditNote creditNote) {
+      this.creditNote = creditNote;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ImportCreditNoteResponse build() {
+      return new ImportCreditNoteResponse(this);
+    }
+  }
+
+  /** Get the creditNote from the response. */
+  public CreditNote getCreditNote() {
+    return creditNote;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/creditNote/responses/VoidCreditNoteResponse.java b/src/main/java/com/chargebee/v4/models/creditNote/responses/VoidCreditNoteResponse.java
new file mode 100644
index 00000000..90ebfe42
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/creditNote/responses/VoidCreditNoteResponse.java
@@ -0,0 +1,76 @@
+package com.chargebee.v4.models.creditNote.responses;
+
+import com.chargebee.v4.models.creditNote.CreditNote;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for VoidCreditNote operation. Contains the response data from the API.
+ */
+public final class VoidCreditNoteResponse extends BaseResponse {
+  private final CreditNote creditNote;
+
+  private VoidCreditNoteResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.creditNote = builder.creditNote;
+  }
+
+  /** Parse JSON response into VoidCreditNoteResponse object. */
+  public static VoidCreditNoteResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into VoidCreditNoteResponse object with HTTP response. */
+  public static VoidCreditNoteResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __creditNoteJson = JsonUtil.getObject(json, "credit_note");
+      if (__creditNoteJson != null) {
+        builder.creditNote(CreditNote.fromJson(__creditNoteJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse VoidCreditNoteResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for VoidCreditNoteResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for VoidCreditNoteResponse. */
+  public static class Builder {
+
+    private CreditNote creditNote;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder creditNote(CreditNote creditNote) {
+      this.creditNote = creditNote;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public VoidCreditNoteResponse build() {
+      return new VoidCreditNoteResponse(this);
+    }
+  }
+
+  /** Get the creditNote from the response. */
+  public CreditNote getCreditNote() {
+    return creditNote;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNoteEstimate/CreditNoteEstimate.java b/src/main/java/com/chargebee/v4/models/creditNoteEstimate/CreditNoteEstimate.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/creditNoteEstimate/CreditNoteEstimate.java
rename to src/main/java/com/chargebee/v4/models/creditNoteEstimate/CreditNoteEstimate.java
index 3b3f7e3d..41f1acce 100644
--- a/src/main/java/com/chargebee/v4/core/models/creditNoteEstimate/CreditNoteEstimate.java
+++ b/src/main/java/com/chargebee/v4/models/creditNoteEstimate/CreditNoteEstimate.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.creditNoteEstimate;
+package com.chargebee.v4.models.creditNoteEstimate;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.math.BigDecimal;
@@ -868,6 +868,7 @@ public static class Discounts {
 
     private Long amount;
     private String description;
+    private String lineItemId;
     private EntityType entityType;
     private DiscountType discountType;
     private String entityId;
@@ -881,6 +882,10 @@ public String getDescription() {
       return description;
     }
 
+    public String getLineItemId() {
+      return lineItemId;
+    }
+
     public EntityType getEntityType() {
       return entityType;
     }
@@ -968,6 +973,8 @@ public static Discounts fromJson(String json) {
 
       obj.description = JsonUtil.getString(json, "description");
 
+      obj.lineItemId = JsonUtil.getString(json, "line_item_id");
+
       obj.entityType = EntityType.fromString(JsonUtil.getString(json, "entity_type"));
 
       obj.discountType = DiscountType.fromString(JsonUtil.getString(json, "discount_type"));
diff --git a/src/main/java/com/chargebee/v4/models/csvTaxRule/params/CsvTaxRuleCreateParams.java b/src/main/java/com/chargebee/v4/models/csvTaxRule/params/CsvTaxRuleCreateParams.java
new file mode 100644
index 00000000..1a061da1
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/csvTaxRule/params/CsvTaxRuleCreateParams.java
@@ -0,0 +1,851 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.csvTaxRule.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class CsvTaxRuleCreateParams {
+
+  private final String taxProfileName;
+
+  private final String country;
+
+  private final String state;
+
+  private final String zipCode;
+
+  private final Integer zipCodeStart;
+
+  private final Integer zipCodeEnd;
+
+  private final String tax1Name;
+
+  private final Number tax1Rate;
+
+  private final Tax1JurisType tax1JurisType;
+
+  private final String tax1JurisName;
+
+  private final String tax1JurisCode;
+
+  private final String tax2Name;
+
+  private final Number tax2Rate;
+
+  private final Tax2JurisType tax2JurisType;
+
+  private final String tax2JurisName;
+
+  private final String tax2JurisCode;
+
+  private final String tax3Name;
+
+  private final Number tax3Rate;
+
+  private final Tax3JurisType tax3JurisType;
+
+  private final String tax3JurisName;
+
+  private final String tax3JurisCode;
+
+  private final String tax4Name;
+
+  private final Number tax4Rate;
+
+  private final Tax4JurisType tax4JurisType;
+
+  private final String tax4JurisName;
+
+  private final String tax4JurisCode;
+
+  private final ServiceType serviceType;
+
+  private final String timeZone;
+
+  private final Timestamp validFrom;
+
+  private final Timestamp validTill;
+
+  private final Boolean overwrite;
+
+  private CsvTaxRuleCreateParams(CsvTaxRuleCreateBuilder builder) {
+
+    this.taxProfileName = builder.taxProfileName;
+
+    this.country = builder.country;
+
+    this.state = builder.state;
+
+    this.zipCode = builder.zipCode;
+
+    this.zipCodeStart = builder.zipCodeStart;
+
+    this.zipCodeEnd = builder.zipCodeEnd;
+
+    this.tax1Name = builder.tax1Name;
+
+    this.tax1Rate = builder.tax1Rate;
+
+    this.tax1JurisType = builder.tax1JurisType;
+
+    this.tax1JurisName = builder.tax1JurisName;
+
+    this.tax1JurisCode = builder.tax1JurisCode;
+
+    this.tax2Name = builder.tax2Name;
+
+    this.tax2Rate = builder.tax2Rate;
+
+    this.tax2JurisType = builder.tax2JurisType;
+
+    this.tax2JurisName = builder.tax2JurisName;
+
+    this.tax2JurisCode = builder.tax2JurisCode;
+
+    this.tax3Name = builder.tax3Name;
+
+    this.tax3Rate = builder.tax3Rate;
+
+    this.tax3JurisType = builder.tax3JurisType;
+
+    this.tax3JurisName = builder.tax3JurisName;
+
+    this.tax3JurisCode = builder.tax3JurisCode;
+
+    this.tax4Name = builder.tax4Name;
+
+    this.tax4Rate = builder.tax4Rate;
+
+    this.tax4JurisType = builder.tax4JurisType;
+
+    this.tax4JurisName = builder.tax4JurisName;
+
+    this.tax4JurisCode = builder.tax4JurisCode;
+
+    this.serviceType = builder.serviceType;
+
+    this.timeZone = builder.timeZone;
+
+    this.validFrom = builder.validFrom;
+
+    this.validTill = builder.validTill;
+
+    this.overwrite = builder.overwrite;
+  }
+
+  public String getTaxProfileName() {
+    return taxProfileName;
+  }
+
+  public String getCountry() {
+    return country;
+  }
+
+  public String getState() {
+    return state;
+  }
+
+  public String getZipCode() {
+    return zipCode;
+  }
+
+  public Integer getZipCodeStart() {
+    return zipCodeStart;
+  }
+
+  public Integer getZipCodeEnd() {
+    return zipCodeEnd;
+  }
+
+  public String getTax1Name() {
+    return tax1Name;
+  }
+
+  public Number getTax1Rate() {
+    return tax1Rate;
+  }
+
+  public Tax1JurisType getTax1JurisType() {
+    return tax1JurisType;
+  }
+
+  public String getTax1JurisName() {
+    return tax1JurisName;
+  }
+
+  public String getTax1JurisCode() {
+    return tax1JurisCode;
+  }
+
+  public String getTax2Name() {
+    return tax2Name;
+  }
+
+  public Number getTax2Rate() {
+    return tax2Rate;
+  }
+
+  public Tax2JurisType getTax2JurisType() {
+    return tax2JurisType;
+  }
+
+  public String getTax2JurisName() {
+    return tax2JurisName;
+  }
+
+  public String getTax2JurisCode() {
+    return tax2JurisCode;
+  }
+
+  public String getTax3Name() {
+    return tax3Name;
+  }
+
+  public Number getTax3Rate() {
+    return tax3Rate;
+  }
+
+  public Tax3JurisType getTax3JurisType() {
+    return tax3JurisType;
+  }
+
+  public String getTax3JurisName() {
+    return tax3JurisName;
+  }
+
+  public String getTax3JurisCode() {
+    return tax3JurisCode;
+  }
+
+  public String getTax4Name() {
+    return tax4Name;
+  }
+
+  public Number getTax4Rate() {
+    return tax4Rate;
+  }
+
+  public Tax4JurisType getTax4JurisType() {
+    return tax4JurisType;
+  }
+
+  public String getTax4JurisName() {
+    return tax4JurisName;
+  }
+
+  public String getTax4JurisCode() {
+    return tax4JurisCode;
+  }
+
+  public ServiceType getServiceType() {
+    return serviceType;
+  }
+
+  public String getTimeZone() {
+    return timeZone;
+  }
+
+  public Timestamp getValidFrom() {
+    return validFrom;
+  }
+
+  public Timestamp getValidTill() {
+    return validTill;
+  }
+
+  public Boolean getOverwrite() {
+    return overwrite;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.taxProfileName != null) {
+
+      formData.put("tax_profile_name", this.taxProfileName);
+    }
+
+    if (this.country != null) {
+
+      formData.put("country", this.country);
+    }
+
+    if (this.state != null) {
+
+      formData.put("state", this.state);
+    }
+
+    if (this.zipCode != null) {
+
+      formData.put("zip_code", this.zipCode);
+    }
+
+    if (this.zipCodeStart != null) {
+
+      formData.put("zip_code_start", this.zipCodeStart);
+    }
+
+    if (this.zipCodeEnd != null) {
+
+      formData.put("zip_code_end", this.zipCodeEnd);
+    }
+
+    if (this.tax1Name != null) {
+
+      formData.put("tax1_name", this.tax1Name);
+    }
+
+    if (this.tax1Rate != null) {
+
+      formData.put("tax1_rate", this.tax1Rate);
+    }
+
+    if (this.tax1JurisType != null) {
+
+      formData.put("tax1_juris_type", this.tax1JurisType);
+    }
+
+    if (this.tax1JurisName != null) {
+
+      formData.put("tax1_juris_name", this.tax1JurisName);
+    }
+
+    if (this.tax1JurisCode != null) {
+
+      formData.put("tax1_juris_code", this.tax1JurisCode);
+    }
+
+    if (this.tax2Name != null) {
+
+      formData.put("tax2_name", this.tax2Name);
+    }
+
+    if (this.tax2Rate != null) {
+
+      formData.put("tax2_rate", this.tax2Rate);
+    }
+
+    if (this.tax2JurisType != null) {
+
+      formData.put("tax2_juris_type", this.tax2JurisType);
+    }
+
+    if (this.tax2JurisName != null) {
+
+      formData.put("tax2_juris_name", this.tax2JurisName);
+    }
+
+    if (this.tax2JurisCode != null) {
+
+      formData.put("tax2_juris_code", this.tax2JurisCode);
+    }
+
+    if (this.tax3Name != null) {
+
+      formData.put("tax3_name", this.tax3Name);
+    }
+
+    if (this.tax3Rate != null) {
+
+      formData.put("tax3_rate", this.tax3Rate);
+    }
+
+    if (this.tax3JurisType != null) {
+
+      formData.put("tax3_juris_type", this.tax3JurisType);
+    }
+
+    if (this.tax3JurisName != null) {
+
+      formData.put("tax3_juris_name", this.tax3JurisName);
+    }
+
+    if (this.tax3JurisCode != null) {
+
+      formData.put("tax3_juris_code", this.tax3JurisCode);
+    }
+
+    if (this.tax4Name != null) {
+
+      formData.put("tax4_name", this.tax4Name);
+    }
+
+    if (this.tax4Rate != null) {
+
+      formData.put("tax4_rate", this.tax4Rate);
+    }
+
+    if (this.tax4JurisType != null) {
+
+      formData.put("tax4_juris_type", this.tax4JurisType);
+    }
+
+    if (this.tax4JurisName != null) {
+
+      formData.put("tax4_juris_name", this.tax4JurisName);
+    }
+
+    if (this.tax4JurisCode != null) {
+
+      formData.put("tax4_juris_code", this.tax4JurisCode);
+    }
+
+    if (this.serviceType != null) {
+
+      formData.put("service_type", this.serviceType);
+    }
+
+    if (this.timeZone != null) {
+
+      formData.put("time_zone", this.timeZone);
+    }
+
+    if (this.validFrom != null) {
+
+      formData.put("valid_from", this.validFrom);
+    }
+
+    if (this.validTill != null) {
+
+      formData.put("valid_till", this.validTill);
+    }
+
+    if (this.overwrite != null) {
+
+      formData.put("overwrite", this.overwrite);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CsvTaxRuleCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CsvTaxRuleCreateBuilder builder() {
+    return new CsvTaxRuleCreateBuilder();
+  }
+
+  public static final class CsvTaxRuleCreateBuilder {
+
+    private String taxProfileName;
+
+    private String country;
+
+    private String state;
+
+    private String zipCode;
+
+    private Integer zipCodeStart;
+
+    private Integer zipCodeEnd;
+
+    private String tax1Name;
+
+    private Number tax1Rate;
+
+    private Tax1JurisType tax1JurisType;
+
+    private String tax1JurisName;
+
+    private String tax1JurisCode;
+
+    private String tax2Name;
+
+    private Number tax2Rate;
+
+    private Tax2JurisType tax2JurisType;
+
+    private String tax2JurisName;
+
+    private String tax2JurisCode;
+
+    private String tax3Name;
+
+    private Number tax3Rate;
+
+    private Tax3JurisType tax3JurisType;
+
+    private String tax3JurisName;
+
+    private String tax3JurisCode;
+
+    private String tax4Name;
+
+    private Number tax4Rate;
+
+    private Tax4JurisType tax4JurisType;
+
+    private String tax4JurisName;
+
+    private String tax4JurisCode;
+
+    private ServiceType serviceType;
+
+    private String timeZone;
+
+    private Timestamp validFrom;
+
+    private Timestamp validTill;
+
+    private Boolean overwrite;
+
+    private CsvTaxRuleCreateBuilder() {}
+
+    public CsvTaxRuleCreateBuilder taxProfileName(String value) {
+      this.taxProfileName = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder country(String value) {
+      this.country = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder state(String value) {
+      this.state = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder zipCode(String value) {
+      this.zipCode = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder zipCodeStart(Integer value) {
+      this.zipCodeStart = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder zipCodeEnd(Integer value) {
+      this.zipCodeEnd = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax1Name(String value) {
+      this.tax1Name = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax1Rate(Number value) {
+      this.tax1Rate = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax1JurisType(Tax1JurisType value) {
+      this.tax1JurisType = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax1JurisName(String value) {
+      this.tax1JurisName = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax1JurisCode(String value) {
+      this.tax1JurisCode = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax2Name(String value) {
+      this.tax2Name = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax2Rate(Number value) {
+      this.tax2Rate = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax2JurisType(Tax2JurisType value) {
+      this.tax2JurisType = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax2JurisName(String value) {
+      this.tax2JurisName = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax2JurisCode(String value) {
+      this.tax2JurisCode = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax3Name(String value) {
+      this.tax3Name = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax3Rate(Number value) {
+      this.tax3Rate = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax3JurisType(Tax3JurisType value) {
+      this.tax3JurisType = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax3JurisName(String value) {
+      this.tax3JurisName = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax3JurisCode(String value) {
+      this.tax3JurisCode = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax4Name(String value) {
+      this.tax4Name = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax4Rate(Number value) {
+      this.tax4Rate = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax4JurisType(Tax4JurisType value) {
+      this.tax4JurisType = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax4JurisName(String value) {
+      this.tax4JurisName = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder tax4JurisCode(String value) {
+      this.tax4JurisCode = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder serviceType(ServiceType value) {
+      this.serviceType = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder timeZone(String value) {
+      this.timeZone = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder validFrom(Timestamp value) {
+      this.validFrom = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder validTill(Timestamp value) {
+      this.validTill = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateBuilder overwrite(Boolean value) {
+      this.overwrite = value;
+      return this;
+    }
+
+    public CsvTaxRuleCreateParams build() {
+      return new CsvTaxRuleCreateParams(this);
+    }
+  }
+
+  public enum Tax1JurisType {
+    COUNTRY("country"),
+
+    FEDERAL("federal"),
+
+    STATE("state"),
+
+    COUNTY("county"),
+
+    CITY("city"),
+
+    SPECIAL("special"),
+
+    UNINCORPORATED("unincorporated"),
+
+    OTHER("other"),
+
+    /** An enum member indicating that Tax1JurisType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Tax1JurisType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Tax1JurisType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Tax1JurisType enumValue : Tax1JurisType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Tax2JurisType {
+    COUNTRY("country"),
+
+    FEDERAL("federal"),
+
+    STATE("state"),
+
+    COUNTY("county"),
+
+    CITY("city"),
+
+    SPECIAL("special"),
+
+    UNINCORPORATED("unincorporated"),
+
+    OTHER("other"),
+
+    /** An enum member indicating that Tax2JurisType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Tax2JurisType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Tax2JurisType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Tax2JurisType enumValue : Tax2JurisType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Tax3JurisType {
+    COUNTRY("country"),
+
+    FEDERAL("federal"),
+
+    STATE("state"),
+
+    COUNTY("county"),
+
+    CITY("city"),
+
+    SPECIAL("special"),
+
+    UNINCORPORATED("unincorporated"),
+
+    OTHER("other"),
+
+    /** An enum member indicating that Tax3JurisType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Tax3JurisType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Tax3JurisType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Tax3JurisType enumValue : Tax3JurisType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Tax4JurisType {
+    COUNTRY("country"),
+
+    FEDERAL("federal"),
+
+    STATE("state"),
+
+    COUNTY("county"),
+
+    CITY("city"),
+
+    SPECIAL("special"),
+
+    UNINCORPORATED("unincorporated"),
+
+    OTHER("other"),
+
+    /** An enum member indicating that Tax4JurisType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Tax4JurisType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Tax4JurisType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Tax4JurisType enumValue : Tax4JurisType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ServiceType {
+    DIGITAL("digital"),
+
+    OTHER("other"),
+
+    NOT_APPLICABLE("not_applicable"),
+
+    /** An enum member indicating that ServiceType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ServiceType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ServiceType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ServiceType enumValue : ServiceType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/csvTaxRule/CsvTaxRuleCreateResponse.java b/src/main/java/com/chargebee/v4/models/csvTaxRule/responses/CsvTaxRuleCreateResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/csvTaxRule/CsvTaxRuleCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/csvTaxRule/responses/CsvTaxRuleCreateResponse.java
index e1eeabdc..fa3db5ab 100644
--- a/src/main/java/com/chargebee/v4/core/responses/csvTaxRule/CsvTaxRuleCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/csvTaxRule/responses/CsvTaxRuleCreateResponse.java
@@ -1,6 +1,6 @@
-package com.chargebee.v4.core.responses.csvTaxRule;
+package com.chargebee.v4.models.csvTaxRule.responses;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.transport.Response;
 
 /**
diff --git a/src/main/java/com/chargebee/v4/core/models/currency/Currency.java b/src/main/java/com/chargebee/v4/models/currency/Currency.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/currency/Currency.java
rename to src/main/java/com/chargebee/v4/models/currency/Currency.java
index b46a0329..62b3c6a0 100644
--- a/src/main/java/com/chargebee/v4/core/models/currency/Currency.java
+++ b/src/main/java/com/chargebee/v4/models/currency/Currency.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.currency;
+package com.chargebee.v4.models.currency;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/models/currency/params/CurrencyAddScheduleParams.java b/src/main/java/com/chargebee/v4/models/currency/params/CurrencyAddScheduleParams.java
new file mode 100644
index 00000000..c8c38fb8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/currency/params/CurrencyAddScheduleParams.java
@@ -0,0 +1,81 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.currency.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class CurrencyAddScheduleParams {
+
+  private final String manualExchangeRate;
+
+  private final Timestamp scheduleAt;
+
+  private CurrencyAddScheduleParams(CurrencyAddScheduleBuilder builder) {
+
+    this.manualExchangeRate = builder.manualExchangeRate;
+
+    this.scheduleAt = builder.scheduleAt;
+  }
+
+  public String getManualExchangeRate() {
+    return manualExchangeRate;
+  }
+
+  public Timestamp getScheduleAt() {
+    return scheduleAt;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.manualExchangeRate != null) {
+
+      formData.put("manual_exchange_rate", this.manualExchangeRate);
+    }
+
+    if (this.scheduleAt != null) {
+
+      formData.put("schedule_at", this.scheduleAt);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CurrencyAddScheduleParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CurrencyAddScheduleBuilder builder() {
+    return new CurrencyAddScheduleBuilder();
+  }
+
+  public static final class CurrencyAddScheduleBuilder {
+
+    private String manualExchangeRate;
+
+    private Timestamp scheduleAt;
+
+    private CurrencyAddScheduleBuilder() {}
+
+    public CurrencyAddScheduleBuilder manualExchangeRate(String value) {
+      this.manualExchangeRate = value;
+      return this;
+    }
+
+    public CurrencyAddScheduleBuilder scheduleAt(Timestamp value) {
+      this.scheduleAt = value;
+      return this;
+    }
+
+    public CurrencyAddScheduleParams build() {
+      return new CurrencyAddScheduleParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/currency/params/CurrencyCreateParams.java b/src/main/java/com/chargebee/v4/models/currency/params/CurrencyCreateParams.java
new file mode 100644
index 00000000..0a81480d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/currency/params/CurrencyCreateParams.java
@@ -0,0 +1,128 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.currency.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CurrencyCreateParams {
+
+  private final String currencyCode;
+
+  private final ForexType forexType;
+
+  private final String manualExchangeRate;
+
+  private CurrencyCreateParams(CurrencyCreateBuilder builder) {
+
+    this.currencyCode = builder.currencyCode;
+
+    this.forexType = builder.forexType;
+
+    this.manualExchangeRate = builder.manualExchangeRate;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public ForexType getForexType() {
+    return forexType;
+  }
+
+  public String getManualExchangeRate() {
+    return manualExchangeRate;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.forexType != null) {
+
+      formData.put("forex_type", this.forexType);
+    }
+
+    if (this.manualExchangeRate != null) {
+
+      formData.put("manual_exchange_rate", this.manualExchangeRate);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CurrencyCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CurrencyCreateBuilder builder() {
+    return new CurrencyCreateBuilder();
+  }
+
+  public static final class CurrencyCreateBuilder {
+
+    private String currencyCode;
+
+    private ForexType forexType;
+
+    private String manualExchangeRate;
+
+    private CurrencyCreateBuilder() {}
+
+    public CurrencyCreateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public CurrencyCreateBuilder forexType(ForexType value) {
+      this.forexType = value;
+      return this;
+    }
+
+    public CurrencyCreateBuilder manualExchangeRate(String value) {
+      this.manualExchangeRate = value;
+      return this;
+    }
+
+    public CurrencyCreateParams build() {
+      return new CurrencyCreateParams(this);
+    }
+  }
+
+  public enum ForexType {
+    MANUAL("manual"),
+
+    AUTO("auto"),
+
+    /** An enum member indicating that ForexType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ForexType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ForexType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ForexType enumValue : ForexType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyListParams.java b/src/main/java/com/chargebee/v4/models/currency/params/CurrencyListParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyListParams.java
rename to src/main/java/com/chargebee/v4/models/currency/params/CurrencyListParams.java
index f5f3518c..588602e1 100644
--- a/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyListParams.java
+++ b/src/main/java/com/chargebee/v4/models/currency/params/CurrencyListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.currency.params;
+package com.chargebee.v4.models.currency.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyRemoveScheduleParams.java b/src/main/java/com/chargebee/v4/models/currency/params/CurrencyRemoveScheduleParams.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyRemoveScheduleParams.java
rename to src/main/java/com/chargebee/v4/models/currency/params/CurrencyRemoveScheduleParams.java
index 4145005c..68d773b5 100644
--- a/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyRemoveScheduleParams.java
+++ b/src/main/java/com/chargebee/v4/models/currency/params/CurrencyRemoveScheduleParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.currency.params;
+package com.chargebee.v4.models.currency.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class CurrencyRemoveScheduleParams {
 
-  private final Map<String, Object> formData;
-
-  private CurrencyRemoveScheduleParams(CurrencyRemoveScheduleBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private CurrencyRemoveScheduleParams(CurrencyRemoveScheduleBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static CurrencyRemoveScheduleBuilder builder() {
   }
 
   public static final class CurrencyRemoveScheduleBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private CurrencyRemoveScheduleBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyRetrieveParams.java b/src/main/java/com/chargebee/v4/models/currency/params/CurrencyRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/currency/params/CurrencyRetrieveParams.java
index 87c5d1db..e0d001c0 100644
--- a/src/main/java/com/chargebee/v4/core/models/currency/params/CurrencyRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/currency/params/CurrencyRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.currency.params;
+package com.chargebee.v4.models.currency.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/currency/params/CurrencyUpdateParams.java b/src/main/java/com/chargebee/v4/models/currency/params/CurrencyUpdateParams.java
new file mode 100644
index 00000000..6c89589c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/currency/params/CurrencyUpdateParams.java
@@ -0,0 +1,108 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.currency.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CurrencyUpdateParams {
+
+  private final ForexType forexType;
+
+  private final String manualExchangeRate;
+
+  private CurrencyUpdateParams(CurrencyUpdateBuilder builder) {
+
+    this.forexType = builder.forexType;
+
+    this.manualExchangeRate = builder.manualExchangeRate;
+  }
+
+  public ForexType getForexType() {
+    return forexType;
+  }
+
+  public String getManualExchangeRate() {
+    return manualExchangeRate;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.forexType != null) {
+
+      formData.put("forex_type", this.forexType);
+    }
+
+    if (this.manualExchangeRate != null) {
+
+      formData.put("manual_exchange_rate", this.manualExchangeRate);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CurrencyUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CurrencyUpdateBuilder builder() {
+    return new CurrencyUpdateBuilder();
+  }
+
+  public static final class CurrencyUpdateBuilder {
+
+    private ForexType forexType;
+
+    private String manualExchangeRate;
+
+    private CurrencyUpdateBuilder() {}
+
+    public CurrencyUpdateBuilder forexType(ForexType value) {
+      this.forexType = value;
+      return this;
+    }
+
+    public CurrencyUpdateBuilder manualExchangeRate(String value) {
+      this.manualExchangeRate = value;
+      return this;
+    }
+
+    public CurrencyUpdateParams build() {
+      return new CurrencyUpdateParams(this);
+    }
+  }
+
+  public enum ForexType {
+    MANUAL("manual"),
+
+    AUTO("auto"),
+
+    /** An enum member indicating that ForexType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ForexType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ForexType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ForexType enumValue : ForexType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/currency/CurrencyAddScheduleResponse.java b/src/main/java/com/chargebee/v4/models/currency/responses/CurrencyAddScheduleResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/currency/CurrencyAddScheduleResponse.java
rename to src/main/java/com/chargebee/v4/models/currency/responses/CurrencyAddScheduleResponse.java
index 1842be33..3e0b1c2f 100644
--- a/src/main/java/com/chargebee/v4/core/responses/currency/CurrencyAddScheduleResponse.java
+++ b/src/main/java/com/chargebee/v4/models/currency/responses/CurrencyAddScheduleResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.currency;
+package com.chargebee.v4.models.currency.responses;
 
-import com.chargebee.v4.core.models.currency.Currency;
+import com.chargebee.v4.models.currency.Currency;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/responses/currency/CurrencyCreateResponse.java b/src/main/java/com/chargebee/v4/models/currency/responses/CurrencyCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/currency/CurrencyCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/currency/responses/CurrencyCreateResponse.java
index 87509f2a..527592cc 100644
--- a/src/main/java/com/chargebee/v4/core/responses/currency/CurrencyCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/currency/responses/CurrencyCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.currency;
+package com.chargebee.v4.models.currency.responses;
 
-import com.chargebee.v4.core.models.currency.Currency;
+import com.chargebee.v4.models.currency.Currency;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/currency/CurrencyListResponse.java b/src/main/java/com/chargebee/v4/models/currency/responses/CurrencyListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/currency/CurrencyListResponse.java
rename to src/main/java/com/chargebee/v4/models/currency/responses/CurrencyListResponse.java
index 6a1ca5b8..d85a13af 100644
--- a/src/main/java/com/chargebee/v4/core/responses/currency/CurrencyListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/currency/responses/CurrencyListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.currency;
+package com.chargebee.v4.models.currency.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.currency.Currency;
+import com.chargebee.v4.models.currency.Currency;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.CurrencyService;
-import com.chargebee.v4.core.models.currency.params.CurrencyListParams;
+import com.chargebee.v4.services.CurrencyService;
+import com.chargebee.v4.models.currency.params.CurrencyListParams;
 
 /** Immutable response object for CurrencyList operation. Contains paginated list data. */
 public final class CurrencyListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public CurrencyListResponse nextPage() throws Exception {
+  public CurrencyListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/currency/CurrencyRemoveScheduleResponse.java b/src/main/java/com/chargebee/v4/models/currency/responses/CurrencyRemoveScheduleResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/currency/CurrencyRemoveScheduleResponse.java
rename to src/main/java/com/chargebee/v4/models/currency/responses/CurrencyRemoveScheduleResponse.java
index c7c7c5cd..1d740b01 100644
--- a/src/main/java/com/chargebee/v4/core/responses/currency/CurrencyRemoveScheduleResponse.java
+++ b/src/main/java/com/chargebee/v4/models/currency/responses/CurrencyRemoveScheduleResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.currency;
+package com.chargebee.v4.models.currency.responses;
 
-import com.chargebee.v4.core.models.currency.Currency;
+import com.chargebee.v4.models.currency.Currency;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/currency/responses/CurrencyRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/currency/responses/CurrencyRetrieveResponse.java
new file mode 100644
index 00000000..36cf0f31
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/currency/responses/CurrencyRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.currency.responses;
+
+import com.chargebee.v4.models.currency.Currency;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CurrencyRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class CurrencyRetrieveResponse extends BaseResponse {
+  private final Currency currency;
+
+  private CurrencyRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.currency = builder.currency;
+  }
+
+  /** Parse JSON response into CurrencyRetrieveResponse object. */
+  public static CurrencyRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CurrencyRetrieveResponse object with HTTP response. */
+  public static CurrencyRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __currencyJson = JsonUtil.getObject(json, "currency");
+      if (__currencyJson != null) {
+        builder.currency(Currency.fromJson(__currencyJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CurrencyRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CurrencyRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CurrencyRetrieveResponse. */
+  public static class Builder {
+
+    private Currency currency;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder currency(Currency currency) {
+      this.currency = currency;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CurrencyRetrieveResponse build() {
+      return new CurrencyRetrieveResponse(this);
+    }
+  }
+
+  /** Get the currency from the response. */
+  public Currency getCurrency() {
+    return currency;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/currency/CurrencyUpdateResponse.java b/src/main/java/com/chargebee/v4/models/currency/responses/CurrencyUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/currency/CurrencyUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/currency/responses/CurrencyUpdateResponse.java
index 59a889f9..8564b823 100644
--- a/src/main/java/com/chargebee/v4/core/responses/currency/CurrencyUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/currency/responses/CurrencyUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.currency;
+package com.chargebee.v4.models.currency.responses;
 
-import com.chargebee.v4.core.models.currency.Currency;
+import com.chargebee.v4.models.currency.Currency;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/Customer.java b/src/main/java/com/chargebee/v4/models/customer/Customer.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/customer/Customer.java
rename to src/main/java/com/chargebee/v4/models/customer/Customer.java
index 9d0bcfea..60533e35 100644
--- a/src/main/java/com/chargebee/v4/core/models/customer/Customer.java
+++ b/src/main/java/com/chargebee/v4/models/customer/Customer.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customer;
+package com.chargebee.v4.models.customer;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -80,7 +80,9 @@ public class Customer {
   private ParentAccountAccess parentAccountAccess;
   private ChildAccountAccess childAccountAccess;
 
-  private java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+  private java.util.Map<String, String> customFields = new java.util.HashMap<>();
+
+  private java.util.Map<String, Object> consentFields = new java.util.HashMap<>();
 
   public String getId() {
     return id;
@@ -353,7 +355,7 @@ public ChildAccountAccess getChildAccountAccess() {
    *
    * @return map containing all custom fields
    */
-  public java.util.Map<String, Object> getCustomFields() {
+  public java.util.Map<String, String> getCustomFields() {
     return customFields;
   }
 
@@ -363,10 +365,44 @@ public java.util.Map<String, Object> getCustomFields() {
    * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
    * @return the value of the custom field, or null if not present
    */
-  public Object getCustomField(String fieldName) {
+  public String getCustomField(String fieldName) {
     return customFields.get(fieldName);
   }
 
+  /**
+   * Returns a map of consent fields. Consent fields are dynamic boolean/option properties that
+   * follow the pattern cs_* (e.g., cs_marketing_consent).
+   *
+   * @return map containing all consent fields
+   */
+  public java.util.Map<String, Object> getConsentFields() {
+    return consentFields;
+  }
+
+  /**
+   * Returns the value of a specific consent field.
+   *
+   * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+   * @return the value of the consent field, or null if not present
+   */
+  public Object getConsentField(String fieldName) {
+    return consentFields.get(fieldName);
+  }
+
+  /**
+   * Returns the boolean value of a specific consent field.
+   *
+   * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+   * @return the boolean value of the consent field, or null if not present or not a boolean
+   */
+  public Boolean getConsentFieldAsBoolean(String fieldName) {
+    Object value = consentFields.get(fieldName);
+    if (value instanceof Boolean) {
+      return (Boolean) value;
+    }
+    return null;
+  }
+
   public enum AutoCollection {
     ON("on"),
 
@@ -856,7 +892,7 @@ public static CustomerType fromString(String value) {
   public static Customer fromJson(String json) {
     Customer obj = new Customer();
 
-    // Parse JSON to extract all keys
+    // Parse JSON to extract all keys for custom field extraction
     java.util.Set<String> knownFields = new java.util.HashSet<>();
 
     knownFields.add("id");
@@ -1171,6 +1207,9 @@ public static Customer fromJson(String json) {
     // Extract custom fields (fields starting with cf_)
     obj.customFields = extractCustomFields(json, knownFields);
 
+    // Extract consent fields (fields starting with cs_)
+    obj.consentFields = extractConsentFields(json, knownFields);
+
     return obj;
   }
 
@@ -1182,9 +1221,9 @@ public static Customer fromJson(String json) {
    * @param knownFields set of known field names
    * @return map of custom fields
    */
-  private static java.util.Map<String, Object> extractCustomFields(
+  private static java.util.Map<String, String> extractCustomFields(
       String json, java.util.Set<String> knownFields) {
-    java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+    java.util.Map<String, String> customFields = new java.util.HashMap<>();
     try {
       // Parse the entire JSON as a map
       java.util.Map<String, Object> allFields = JsonUtil.parseJsonObjectToMap(json);
@@ -1193,7 +1232,8 @@ private static java.util.Map<String, Object> extractCustomFields(
           String key = entry.getKey();
           // Include fields that start with "cf_" and are not in knownFields
           if (key != null && key.startsWith("cf_") && !knownFields.contains(key)) {
-            customFields.put(key, entry.getValue());
+            customFields.put(
+                key, entry.getValue() != null ? String.valueOf(entry.getValue()) : null);
           }
         }
       }
@@ -1203,6 +1243,35 @@ private static java.util.Map<String, Object> extractCustomFields(
     return customFields;
   }
 
+  /**
+   * Helper method to extract consent fields from JSON. Consent fields are fields that start with
+   * "cs_" and are not in the known fields set. They typically contain boolean values or options.
+   *
+   * @param json JSON string to parse
+   * @param knownFields set of known field names
+   * @return map of consent fields
+   */
+  private static java.util.Map<String, Object> extractConsentFields(
+      String json, java.util.Set<String> knownFields) {
+    java.util.Map<String, Object> consentFields = new java.util.HashMap<>();
+    try {
+      // Parse the entire JSON as a map
+      java.util.Map<String, Object> allFields = JsonUtil.parseJsonObjectToMap(json);
+      if (allFields != null) {
+        for (java.util.Map.Entry<String, Object> entry : allFields.entrySet()) {
+          String key = entry.getKey();
+          // Include fields that start with "cs_" and are not in knownFields
+          if (key != null && key.startsWith("cs_") && !knownFields.contains(key)) {
+            consentFields.put(key, entry.getValue());
+          }
+        }
+      }
+    } catch (Exception e) {
+      // If parsing fails, return empty map
+    }
+    return consentFields;
+  }
+
   public static class BillingAddress {
 
     private String firstName;
@@ -1592,6 +1661,16 @@ public enum Type {
 
       PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
 
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
       /** An enum member indicating that Type was instantiated with an unknown value. */
       _UNKNOWN(null);
       private final String value;
@@ -1726,6 +1805,8 @@ public enum Gateway {
 
       DEUTSCHE_BANK("deutsche_bank"),
 
+      EZIDEBIT("ezidebit"),
+
       NOT_APPLICABLE("not_applicable"),
 
       /** An enum member indicating that Gateway was instantiated with an unknown value. */
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/ContactsForCustomerParams.java b/src/main/java/com/chargebee/v4/models/customer/params/ContactsForCustomerParams.java
new file mode 100644
index 00000000..ad4aaf20
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/ContactsForCustomerParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ContactsForCustomerParams {
+
+  private final Map<String, Object> queryParams;
+
+  private ContactsForCustomerParams(ContactsForCustomerBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public ContactsForCustomerBuilder toBuilder() {
+    ContactsForCustomerBuilder builder = new ContactsForCustomerBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for ContactsForCustomerParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ContactsForCustomerBuilder builder() {
+    return new ContactsForCustomerBuilder();
+  }
+
+  public static final class ContactsForCustomerBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private ContactsForCustomerBuilder() {}
+
+    public ContactsForCustomerBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public ContactsForCustomerBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public ContactsForCustomerParams build() {
+      return new ContactsForCustomerParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerAddContactParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerAddContactParams.java
new file mode 100644
index 00000000..ea3cb495
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerAddContactParams.java
@@ -0,0 +1,342 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerAddContactParams {
+
+  private final ContactParams contact;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerAddContactParams(CustomerAddContactBuilder builder) {
+
+    this.contact = builder.contact;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public ContactParams getContact() {
+    return contact;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.contact != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contact.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contact[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerAddContactParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerAddContactBuilder builder() {
+    return new CustomerAddContactBuilder();
+  }
+
+  public static final class CustomerAddContactBuilder {
+
+    private ContactParams contact;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerAddContactBuilder() {}
+
+    public CustomerAddContactBuilder contact(ContactParams value) {
+      this.contact = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerAddContactBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerAddContactBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerAddContactBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerAddContactParams build() {
+      return new CustomerAddContactParams(this);
+    }
+  }
+
+  public static final class ContactParams {
+
+    private final String id;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String phone;
+
+    private final String label;
+
+    private final Boolean enabled;
+
+    private final Boolean sendBillingEmail;
+
+    private final Boolean sendAccountEmail;
+
+    private ContactParams(ContactBuilder builder) {
+
+      this.id = builder.id;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.phone = builder.phone;
+
+      this.label = builder.label;
+
+      this.enabled = builder.enabled;
+
+      this.sendBillingEmail = builder.sendBillingEmail;
+
+      this.sendAccountEmail = builder.sendAccountEmail;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLabel() {
+      return label;
+    }
+
+    public Boolean getEnabled() {
+      return enabled;
+    }
+
+    public Boolean getSendBillingEmail() {
+      return sendBillingEmail;
+    }
+
+    public Boolean getSendAccountEmail() {
+      return sendAccountEmail;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.label != null) {
+
+        formData.put("label", this.label);
+      }
+
+      if (this.enabled != null) {
+
+        formData.put("enabled", this.enabled);
+      }
+
+      if (this.sendBillingEmail != null) {
+
+        formData.put("send_billing_email", this.sendBillingEmail);
+      }
+
+      if (this.sendAccountEmail != null) {
+
+        formData.put("send_account_email", this.sendAccountEmail);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContactParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContactBuilder builder() {
+      return new ContactBuilder();
+    }
+
+    public static final class ContactBuilder {
+
+      private String id;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String phone;
+
+      private String label;
+
+      private Boolean enabled;
+
+      private Boolean sendBillingEmail;
+
+      private Boolean sendAccountEmail;
+
+      private ContactBuilder() {}
+
+      public ContactBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public ContactBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ContactBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ContactBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ContactBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ContactBuilder label(String value) {
+        this.label = value;
+        return this;
+      }
+
+      public ContactBuilder enabled(Boolean value) {
+        this.enabled = value;
+        return this;
+      }
+
+      public ContactBuilder sendBillingEmail(Boolean value) {
+        this.sendBillingEmail = value;
+        return this;
+      }
+
+      public ContactBuilder sendAccountEmail(Boolean value) {
+        this.sendAccountEmail = value;
+        return this;
+      }
+
+      public ContactParams build() {
+        return new ContactParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerAddPromotionalCreditsParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerAddPromotionalCreditsParams.java
new file mode 100644
index 00000000..ad00bd35
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerAddPromotionalCreditsParams.java
@@ -0,0 +1,239 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerAddPromotionalCreditsParams {
+
+  private final Long amount;
+
+  private final String currencyCode;
+
+  private final String description;
+
+  private final CreditType creditType;
+
+  private final String reference;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerAddPromotionalCreditsParams(CustomerAddPromotionalCreditsBuilder builder) {
+
+    this.amount = builder.amount;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.description = builder.description;
+
+    this.creditType = builder.creditType;
+
+    this.reference = builder.reference;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public CreditType getCreditType() {
+    return creditType;
+  }
+
+  public String getReference() {
+    return reference;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.creditType != null) {
+
+      formData.put("credit_type", this.creditType);
+    }
+
+    if (this.reference != null) {
+
+      formData.put("reference", this.reference);
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerAddPromotionalCreditsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerAddPromotionalCreditsBuilder builder() {
+    return new CustomerAddPromotionalCreditsBuilder();
+  }
+
+  public static final class CustomerAddPromotionalCreditsBuilder {
+
+    private Long amount;
+
+    private String currencyCode;
+
+    private String description;
+
+    private CreditType creditType;
+
+    private String reference;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerAddPromotionalCreditsBuilder() {}
+
+    public CustomerAddPromotionalCreditsBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public CustomerAddPromotionalCreditsBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public CustomerAddPromotionalCreditsBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public CustomerAddPromotionalCreditsBuilder creditType(CreditType value) {
+      this.creditType = value;
+      return this;
+    }
+
+    public CustomerAddPromotionalCreditsBuilder reference(String value) {
+      this.reference = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerAddPromotionalCreditsBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerAddPromotionalCreditsBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerAddPromotionalCreditsBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerAddPromotionalCreditsParams build() {
+      return new CustomerAddPromotionalCreditsParams(this);
+    }
+  }
+
+  public enum CreditType {
+    LOYALTY_CREDITS("loyalty_credits"),
+
+    REFERRAL_REWARDS("referral_rewards"),
+
+    GENERAL("general"),
+
+    /** An enum member indicating that CreditType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CreditType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CreditType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CreditType enumValue : CreditType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerAssignPaymentRoleParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerAssignPaymentRoleParams.java
new file mode 100644
index 00000000..d60ad25a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerAssignPaymentRoleParams.java
@@ -0,0 +1,179 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerAssignPaymentRoleParams {
+
+  private final String paymentSourceId;
+
+  private final Role role;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerAssignPaymentRoleParams(CustomerAssignPaymentRoleBuilder builder) {
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.role = builder.role;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public Role getRole() {
+    return role;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.role != null) {
+
+      formData.put("role", this.role);
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerAssignPaymentRoleParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerAssignPaymentRoleBuilder builder() {
+    return new CustomerAssignPaymentRoleBuilder();
+  }
+
+  public static final class CustomerAssignPaymentRoleBuilder {
+
+    private String paymentSourceId;
+
+    private Role role;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerAssignPaymentRoleBuilder() {}
+
+    public CustomerAssignPaymentRoleBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public CustomerAssignPaymentRoleBuilder role(Role value) {
+      this.role = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerAssignPaymentRoleBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerAssignPaymentRoleBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerAssignPaymentRoleBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerAssignPaymentRoleParams build() {
+      return new CustomerAssignPaymentRoleParams(this);
+    }
+  }
+
+  public enum Role {
+    PRIMARY("primary"),
+
+    BACKUP("backup"),
+
+    NONE("none"),
+
+    /** An enum member indicating that Role was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Role(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Role fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Role enumValue : Role.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerChangeBillingDateParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerChangeBillingDateParams.java
new file mode 100644
index 00000000..b779903a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerChangeBillingDateParams.java
@@ -0,0 +1,305 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerChangeBillingDateParams {
+
+  private final Integer billingDate;
+
+  private final Integer billingMonth;
+
+  private final BillingDateMode billingDateMode;
+
+  private final BillingDayOfWeek billingDayOfWeek;
+
+  private final BillingDayOfWeekMode billingDayOfWeekMode;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerChangeBillingDateParams(CustomerChangeBillingDateBuilder builder) {
+
+    this.billingDate = builder.billingDate;
+
+    this.billingMonth = builder.billingMonth;
+
+    this.billingDateMode = builder.billingDateMode;
+
+    this.billingDayOfWeek = builder.billingDayOfWeek;
+
+    this.billingDayOfWeekMode = builder.billingDayOfWeekMode;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public Integer getBillingDate() {
+    return billingDate;
+  }
+
+  public Integer getBillingMonth() {
+    return billingMonth;
+  }
+
+  public BillingDateMode getBillingDateMode() {
+    return billingDateMode;
+  }
+
+  public BillingDayOfWeek getBillingDayOfWeek() {
+    return billingDayOfWeek;
+  }
+
+  public BillingDayOfWeekMode getBillingDayOfWeekMode() {
+    return billingDayOfWeekMode;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.billingDate != null) {
+
+      formData.put("billing_date", this.billingDate);
+    }
+
+    if (this.billingMonth != null) {
+
+      formData.put("billing_month", this.billingMonth);
+    }
+
+    if (this.billingDateMode != null) {
+
+      formData.put("billing_date_mode", this.billingDateMode);
+    }
+
+    if (this.billingDayOfWeek != null) {
+
+      formData.put("billing_day_of_week", this.billingDayOfWeek);
+    }
+
+    if (this.billingDayOfWeekMode != null) {
+
+      formData.put("billing_day_of_week_mode", this.billingDayOfWeekMode);
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerChangeBillingDateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerChangeBillingDateBuilder builder() {
+    return new CustomerChangeBillingDateBuilder();
+  }
+
+  public static final class CustomerChangeBillingDateBuilder {
+
+    private Integer billingDate;
+
+    private Integer billingMonth;
+
+    private BillingDateMode billingDateMode;
+
+    private BillingDayOfWeek billingDayOfWeek;
+
+    private BillingDayOfWeekMode billingDayOfWeekMode;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerChangeBillingDateBuilder() {}
+
+    public CustomerChangeBillingDateBuilder billingDate(Integer value) {
+      this.billingDate = value;
+      return this;
+    }
+
+    public CustomerChangeBillingDateBuilder billingMonth(Integer value) {
+      this.billingMonth = value;
+      return this;
+    }
+
+    public CustomerChangeBillingDateBuilder billingDateMode(BillingDateMode value) {
+      this.billingDateMode = value;
+      return this;
+    }
+
+    public CustomerChangeBillingDateBuilder billingDayOfWeek(BillingDayOfWeek value) {
+      this.billingDayOfWeek = value;
+      return this;
+    }
+
+    public CustomerChangeBillingDateBuilder billingDayOfWeekMode(BillingDayOfWeekMode value) {
+      this.billingDayOfWeekMode = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerChangeBillingDateBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerChangeBillingDateBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerChangeBillingDateBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerChangeBillingDateParams build() {
+      return new CustomerChangeBillingDateParams(this);
+    }
+  }
+
+  public enum BillingDateMode {
+    USING_DEFAULTS("using_defaults"),
+
+    MANUALLY_SET("manually_set"),
+
+    /** An enum member indicating that BillingDateMode was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingDateMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingDateMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingDateMode enumValue : BillingDateMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum BillingDayOfWeek {
+    SUNDAY("sunday"),
+
+    MONDAY("monday"),
+
+    TUESDAY("tuesday"),
+
+    WEDNESDAY("wednesday"),
+
+    THURSDAY("thursday"),
+
+    FRIDAY("friday"),
+
+    SATURDAY("saturday"),
+
+    /** An enum member indicating that BillingDayOfWeek was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingDayOfWeek(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingDayOfWeek fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingDayOfWeek enumValue : BillingDayOfWeek.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum BillingDayOfWeekMode {
+    USING_DEFAULTS("using_defaults"),
+
+    MANUALLY_SET("manually_set"),
+
+    /**
+     * An enum member indicating that BillingDayOfWeekMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingDayOfWeekMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingDayOfWeekMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingDayOfWeekMode enumValue : BillingDayOfWeekMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerClearPersonalDataParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerClearPersonalDataParams.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/models/customer/params/CustomerClearPersonalDataParams.java
rename to src/main/java/com/chargebee/v4/models/customer/params/CustomerClearPersonalDataParams.java
index 1f1c1ea5..6db1f848 100644
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerClearPersonalDataParams.java
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerClearPersonalDataParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.customer.params;
+package com.chargebee.v4.models.customer.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class CustomerClearPersonalDataParams {
 
-  private final Map<String, Object> formData;
-
-  private CustomerClearPersonalDataParams(CustomerClearPersonalDataBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private CustomerClearPersonalDataParams(CustomerClearPersonalDataBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static CustomerClearPersonalDataBuilder builder() {
   }
 
   public static final class CustomerClearPersonalDataBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private CustomerClearPersonalDataBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerCollectPaymentParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerCollectPaymentParams.java
new file mode 100644
index 00000000..5f83ccbe
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerCollectPaymentParams.java
@@ -0,0 +1,1269 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class CustomerCollectPaymentParams {
+
+  private final Long amount;
+
+  private final String paymentSourceId;
+
+  private final String tokenId;
+
+  private final Boolean replacePrimaryPaymentSource;
+
+  private final Boolean retainPaymentSource;
+
+  private final PaymentInitiator paymentInitiator;
+
+  private final PaymentMethodParams paymentMethod;
+
+  private final CardParams card;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final List<InvoiceAllocationsParams> invoiceAllocations;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerCollectPaymentParams(CustomerCollectPaymentBuilder builder) {
+
+    this.amount = builder.amount;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.tokenId = builder.tokenId;
+
+    this.replacePrimaryPaymentSource = builder.replacePrimaryPaymentSource;
+
+    this.retainPaymentSource = builder.retainPaymentSource;
+
+    this.paymentInitiator = builder.paymentInitiator;
+
+    this.paymentMethod = builder.paymentMethod;
+
+    this.card = builder.card;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.invoiceAllocations = builder.invoiceAllocations;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public String getTokenId() {
+    return tokenId;
+  }
+
+  public Boolean getReplacePrimaryPaymentSource() {
+    return replacePrimaryPaymentSource;
+  }
+
+  public Boolean getRetainPaymentSource() {
+    return retainPaymentSource;
+  }
+
+  public PaymentInitiator getPaymentInitiator() {
+    return paymentInitiator;
+  }
+
+  public PaymentMethodParams getPaymentMethod() {
+    return paymentMethod;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public List<InvoiceAllocationsParams> getInvoiceAllocations() {
+    return invoiceAllocations;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.tokenId != null) {
+
+      formData.put("token_id", this.tokenId);
+    }
+
+    if (this.replacePrimaryPaymentSource != null) {
+
+      formData.put("replace_primary_payment_source", this.replacePrimaryPaymentSource);
+    }
+
+    if (this.retainPaymentSource != null) {
+
+      formData.put("retain_payment_source", this.retainPaymentSource);
+    }
+
+    if (this.paymentInitiator != null) {
+
+      formData.put("payment_initiator", this.paymentInitiator);
+    }
+
+    if (this.paymentMethod != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentMethod.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_method[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.invoiceAllocations != null) {
+
+      // List of objects
+      for (int i = 0; i < this.invoiceAllocations.size(); i++) {
+        InvoiceAllocationsParams item = this.invoiceAllocations.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "invoice_allocations[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerCollectPaymentParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerCollectPaymentBuilder builder() {
+    return new CustomerCollectPaymentBuilder();
+  }
+
+  public static final class CustomerCollectPaymentBuilder {
+
+    private Long amount;
+
+    private String paymentSourceId;
+
+    private String tokenId;
+
+    private Boolean replacePrimaryPaymentSource;
+
+    private Boolean retainPaymentSource;
+
+    private PaymentInitiator paymentInitiator;
+
+    private PaymentMethodParams paymentMethod;
+
+    private CardParams card;
+
+    private PaymentIntentParams paymentIntent;
+
+    private List<InvoiceAllocationsParams> invoiceAllocations;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerCollectPaymentBuilder() {}
+
+    public CustomerCollectPaymentBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public CustomerCollectPaymentBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public CustomerCollectPaymentBuilder tokenId(String value) {
+      this.tokenId = value;
+      return this;
+    }
+
+    public CustomerCollectPaymentBuilder replacePrimaryPaymentSource(Boolean value) {
+      this.replacePrimaryPaymentSource = value;
+      return this;
+    }
+
+    public CustomerCollectPaymentBuilder retainPaymentSource(Boolean value) {
+      this.retainPaymentSource = value;
+      return this;
+    }
+
+    public CustomerCollectPaymentBuilder paymentInitiator(PaymentInitiator value) {
+      this.paymentInitiator = value;
+      return this;
+    }
+
+    public CustomerCollectPaymentBuilder paymentMethod(PaymentMethodParams value) {
+      this.paymentMethod = value;
+      return this;
+    }
+
+    public CustomerCollectPaymentBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public CustomerCollectPaymentBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public CustomerCollectPaymentBuilder invoiceAllocations(List<InvoiceAllocationsParams> value) {
+      this.invoiceAllocations = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerCollectPaymentBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerCollectPaymentBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerCollectPaymentBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerCollectPaymentParams build() {
+      return new CustomerCollectPaymentParams(this);
+    }
+  }
+
+  public enum PaymentInitiator {
+    CUSTOMER("customer"),
+
+    MERCHANT("merchant"),
+
+    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentInitiator(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentInitiator fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class PaymentMethodParams {
+
+    private final Type type;
+
+    private final String gatewayAccountId;
+
+    private final String referenceId;
+
+    private final String tmpToken;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentMethodParams(PaymentMethodBuilder builder) {
+
+      this.type = builder.type;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.referenceId = builder.referenceId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentMethodBuilder builder() {
+      return new PaymentMethodBuilder();
+    }
+
+    public static final class PaymentMethodBuilder {
+
+      private Type type;
+
+      private String gatewayAccountId;
+
+      private String referenceId;
+
+      private String tmpToken;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentMethodBuilder() {}
+
+      public PaymentMethodBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentMethodParams build() {
+        return new PaymentMethodParams(this);
+      }
+    }
+
+    public enum Type {
+      CARD("card"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      GENERIC("generic"),
+
+      ALIPAY("alipay"),
+
+      UNIONPAY("unionpay"),
+
+      APPLE_PAY("apple_pay"),
+
+      WECHAT_PAY("wechat_pay"),
+
+      IDEAL("ideal"),
+
+      GOOGLE_PAY("google_pay"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GIROPAY("giropay"),
+
+      DOTPAY("dotpay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      VENMO("venmo"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final String gatewayAccountId;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String number;
+
+    private final Integer expiryMonth;
+
+    private final Integer expiryYear;
+
+    private final String cvv;
+
+    private final PreferredScheme preferredScheme;
+
+    private final String billingAddr1;
+
+    private final String billingAddr2;
+
+    private final String billingCity;
+
+    private final String billingStateCode;
+
+    private final String billingState;
+
+    private final String billingZip;
+
+    private final String billingCountry;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.number = builder.number;
+
+      this.expiryMonth = builder.expiryMonth;
+
+      this.expiryYear = builder.expiryYear;
+
+      this.cvv = builder.cvv;
+
+      this.preferredScheme = builder.preferredScheme;
+
+      this.billingAddr1 = builder.billingAddr1;
+
+      this.billingAddr2 = builder.billingAddr2;
+
+      this.billingCity = builder.billingCity;
+
+      this.billingStateCode = builder.billingStateCode;
+
+      this.billingState = builder.billingState;
+
+      this.billingZip = builder.billingZip;
+
+      this.billingCountry = builder.billingCountry;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getNumber() {
+      return number;
+    }
+
+    public Integer getExpiryMonth() {
+      return expiryMonth;
+    }
+
+    public Integer getExpiryYear() {
+      return expiryYear;
+    }
+
+    public String getCvv() {
+      return cvv;
+    }
+
+    public PreferredScheme getPreferredScheme() {
+      return preferredScheme;
+    }
+
+    public String getBillingAddr1() {
+      return billingAddr1;
+    }
+
+    public String getBillingAddr2() {
+      return billingAddr2;
+    }
+
+    public String getBillingCity() {
+      return billingCity;
+    }
+
+    public String getBillingStateCode() {
+      return billingStateCode;
+    }
+
+    public String getBillingState() {
+      return billingState;
+    }
+
+    public String getBillingZip() {
+      return billingZip;
+    }
+
+    public String getBillingCountry() {
+      return billingCountry;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.number != null) {
+
+        formData.put("number", this.number);
+      }
+
+      if (this.expiryMonth != null) {
+
+        formData.put("expiry_month", this.expiryMonth);
+      }
+
+      if (this.expiryYear != null) {
+
+        formData.put("expiry_year", this.expiryYear);
+      }
+
+      if (this.cvv != null) {
+
+        formData.put("cvv", this.cvv);
+      }
+
+      if (this.preferredScheme != null) {
+
+        formData.put("preferred_scheme", this.preferredScheme);
+      }
+
+      if (this.billingAddr1 != null) {
+
+        formData.put("billing_addr1", this.billingAddr1);
+      }
+
+      if (this.billingAddr2 != null) {
+
+        formData.put("billing_addr2", this.billingAddr2);
+      }
+
+      if (this.billingCity != null) {
+
+        formData.put("billing_city", this.billingCity);
+      }
+
+      if (this.billingStateCode != null) {
+
+        formData.put("billing_state_code", this.billingStateCode);
+      }
+
+      if (this.billingState != null) {
+
+        formData.put("billing_state", this.billingState);
+      }
+
+      if (this.billingZip != null) {
+
+        formData.put("billing_zip", this.billingZip);
+      }
+
+      if (this.billingCountry != null) {
+
+        formData.put("billing_country", this.billingCountry);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private String gatewayAccountId;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String number;
+
+      private Integer expiryMonth;
+
+      private Integer expiryYear;
+
+      private String cvv;
+
+      private PreferredScheme preferredScheme;
+
+      private String billingAddr1;
+
+      private String billingAddr2;
+
+      private String billingCity;
+
+      private String billingStateCode;
+
+      private String billingState;
+
+      private String billingZip;
+
+      private String billingCountry;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private CardBuilder() {}
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public CardBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CardBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CardBuilder number(String value) {
+        this.number = value;
+        return this;
+      }
+
+      public CardBuilder expiryMonth(Integer value) {
+        this.expiryMonth = value;
+        return this;
+      }
+
+      public CardBuilder expiryYear(Integer value) {
+        this.expiryYear = value;
+        return this;
+      }
+
+      public CardBuilder cvv(String value) {
+        this.cvv = value;
+        return this;
+      }
+
+      public CardBuilder preferredScheme(PreferredScheme value) {
+        this.preferredScheme = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr1(String value) {
+        this.billingAddr1 = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr2(String value) {
+        this.billingAddr2 = value;
+        return this;
+      }
+
+      public CardBuilder billingCity(String value) {
+        this.billingCity = value;
+        return this;
+      }
+
+      public CardBuilder billingStateCode(String value) {
+        this.billingStateCode = value;
+        return this;
+      }
+
+      public CardBuilder billingState(String value) {
+        this.billingState = value;
+        return this;
+      }
+
+      public CardBuilder billingZip(String value) {
+        this.billingZip = value;
+        return this;
+      }
+
+      public CardBuilder billingCountry(String value) {
+        this.billingCountry = value;
+        return this;
+      }
+
+      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum PreferredScheme {
+      CARTES_BANCAIRES("cartes_bancaires"),
+
+      MASTERCARD("mastercard"),
+
+      VISA("visa"),
+
+      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PreferredScheme(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PreferredScheme fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PreferredScheme enumValue : PreferredScheme.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String gwPaymentMethodId;
+
+    private final String referenceId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.referenceId = builder.referenceId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String gwPaymentMethodId;
+
+      private String referenceId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class InvoiceAllocationsParams {
+
+    private final String invoiceId;
+
+    private final Long allocationAmount;
+
+    private InvoiceAllocationsParams(InvoiceAllocationsBuilder builder) {
+
+      this.invoiceId = builder.invoiceId;
+
+      this.allocationAmount = builder.allocationAmount;
+    }
+
+    public String getInvoiceId() {
+      return invoiceId;
+    }
+
+    public Long getAllocationAmount() {
+      return allocationAmount;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.invoiceId != null) {
+
+        formData.put("invoice_id", this.invoiceId);
+      }
+
+      if (this.allocationAmount != null) {
+
+        formData.put("allocation_amount", this.allocationAmount);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceAllocationsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceAllocationsBuilder builder() {
+      return new InvoiceAllocationsBuilder();
+    }
+
+    public static final class InvoiceAllocationsBuilder {
+
+      private String invoiceId;
+
+      private Long allocationAmount;
+
+      private InvoiceAllocationsBuilder() {}
+
+      public InvoiceAllocationsBuilder invoiceId(String value) {
+        this.invoiceId = value;
+        return this;
+      }
+
+      public InvoiceAllocationsBuilder allocationAmount(Long value) {
+        this.allocationAmount = value;
+        return this;
+      }
+
+      public InvoiceAllocationsParams build() {
+        return new InvoiceAllocationsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerCreateParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerCreateParams.java
new file mode 100644
index 00000000..49b7f90e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerCreateParams.java
@@ -0,0 +1,3498 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class CustomerCreateParams {
+
+  private final String id;
+
+  private final String firstName;
+
+  private final String lastName;
+
+  private final String email;
+
+  private final String preferredCurrencyCode;
+
+  private final String phone;
+
+  private final String company;
+
+  private final AutoCollection autoCollection;
+
+  private final Integer netTermDays;
+
+  private final Boolean allowDirectDebit;
+
+  private final String vatNumber;
+
+  private final String vatNumberPrefix;
+
+  private final String entityIdentifierScheme;
+
+  private final String entityIdentifierStandard;
+
+  private final Boolean registeredForGst;
+
+  private final Boolean isEinvoiceEnabled;
+
+  private final EinvoicingMethod einvoicingMethod;
+
+  private final Taxability taxability;
+
+  private final List<Object> exemptionDetails;
+
+  private final CustomerType customerType;
+
+  private final String clientProfileId;
+
+  private final TaxjarExemptionCategory taxjarExemptionCategory;
+
+  private final Boolean businessCustomerWithoutVatNumber;
+
+  private final String locale;
+
+  private final EntityCode entityCode;
+
+  private final String exemptNumber;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final OfflinePaymentMethod offlinePaymentMethod;
+
+  private final Boolean autoCloseInvoices;
+
+  private final Boolean consolidatedInvoicing;
+
+  private final String tokenId;
+
+  private final String businessEntityId;
+
+  private final String createdFromIp;
+
+  private final String invoiceNotes;
+
+  private final CardParams card;
+
+  private final BankAccountParams bankAccount;
+
+  private final PaymentMethodParams paymentMethod;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final BillingAddressParams billingAddress;
+
+  private final List<EntityIdentifiersParams> entityIdentifiers;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private final Map<String, String> customFields;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerCreateParams(CustomerCreateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.firstName = builder.firstName;
+
+    this.lastName = builder.lastName;
+
+    this.email = builder.email;
+
+    this.preferredCurrencyCode = builder.preferredCurrencyCode;
+
+    this.phone = builder.phone;
+
+    this.company = builder.company;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.netTermDays = builder.netTermDays;
+
+    this.allowDirectDebit = builder.allowDirectDebit;
+
+    this.vatNumber = builder.vatNumber;
+
+    this.vatNumberPrefix = builder.vatNumberPrefix;
+
+    this.entityIdentifierScheme = builder.entityIdentifierScheme;
+
+    this.entityIdentifierStandard = builder.entityIdentifierStandard;
+
+    this.registeredForGst = builder.registeredForGst;
+
+    this.isEinvoiceEnabled = builder.isEinvoiceEnabled;
+
+    this.einvoicingMethod = builder.einvoicingMethod;
+
+    this.taxability = builder.taxability;
+
+    this.exemptionDetails = builder.exemptionDetails;
+
+    this.customerType = builder.customerType;
+
+    this.clientProfileId = builder.clientProfileId;
+
+    this.taxjarExemptionCategory = builder.taxjarExemptionCategory;
+
+    this.businessCustomerWithoutVatNumber = builder.businessCustomerWithoutVatNumber;
+
+    this.locale = builder.locale;
+
+    this.entityCode = builder.entityCode;
+
+    this.exemptNumber = builder.exemptNumber;
+
+    this.metaData = builder.metaData;
+
+    this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+    this.autoCloseInvoices = builder.autoCloseInvoices;
+
+    this.consolidatedInvoicing = builder.consolidatedInvoicing;
+
+    this.tokenId = builder.tokenId;
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.createdFromIp = builder.createdFromIp;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.card = builder.card;
+
+    this.bankAccount = builder.bankAccount;
+
+    this.paymentMethod = builder.paymentMethod;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.entityIdentifiers = builder.entityIdentifiers;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getFirstName() {
+    return firstName;
+  }
+
+  public String getLastName() {
+    return lastName;
+  }
+
+  public String getEmail() {
+    return email;
+  }
+
+  public String getPreferredCurrencyCode() {
+    return preferredCurrencyCode;
+  }
+
+  public String getPhone() {
+    return phone;
+  }
+
+  public String getCompany() {
+    return company;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public Integer getNetTermDays() {
+    return netTermDays;
+  }
+
+  public Boolean getAllowDirectDebit() {
+    return allowDirectDebit;
+  }
+
+  public String getVatNumber() {
+    return vatNumber;
+  }
+
+  public String getVatNumberPrefix() {
+    return vatNumberPrefix;
+  }
+
+  public String getEntityIdentifierScheme() {
+    return entityIdentifierScheme;
+  }
+
+  public String getEntityIdentifierStandard() {
+    return entityIdentifierStandard;
+  }
+
+  public Boolean getRegisteredForGst() {
+    return registeredForGst;
+  }
+
+  public Boolean getIsEinvoiceEnabled() {
+    return isEinvoiceEnabled;
+  }
+
+  public EinvoicingMethod getEinvoicingMethod() {
+    return einvoicingMethod;
+  }
+
+  public Taxability getTaxability() {
+    return taxability;
+  }
+
+  public List<Object> getExemptionDetails() {
+    return exemptionDetails;
+  }
+
+  public CustomerType getCustomerType() {
+    return customerType;
+  }
+
+  public String getClientProfileId() {
+    return clientProfileId;
+  }
+
+  public TaxjarExemptionCategory getTaxjarExemptionCategory() {
+    return taxjarExemptionCategory;
+  }
+
+  public Boolean getBusinessCustomerWithoutVatNumber() {
+    return businessCustomerWithoutVatNumber;
+  }
+
+  public String getLocale() {
+    return locale;
+  }
+
+  public EntityCode getEntityCode() {
+    return entityCode;
+  }
+
+  public String getExemptNumber() {
+    return exemptNumber;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public OfflinePaymentMethod getOfflinePaymentMethod() {
+    return offlinePaymentMethod;
+  }
+
+  public Boolean getAutoCloseInvoices() {
+    return autoCloseInvoices;
+  }
+
+  public Boolean getConsolidatedInvoicing() {
+    return consolidatedInvoicing;
+  }
+
+  public String getTokenId() {
+    return tokenId;
+  }
+
+  public String getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public String getCreatedFromIp() {
+    return createdFromIp;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public BankAccountParams getBankAccount() {
+    return bankAccount;
+  }
+
+  public PaymentMethodParams getPaymentMethod() {
+    return paymentMethod;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public List<EntityIdentifiersParams> getEntityIdentifiers() {
+    return entityIdentifiers;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.firstName != null) {
+
+      formData.put("first_name", this.firstName);
+    }
+
+    if (this.lastName != null) {
+
+      formData.put("last_name", this.lastName);
+    }
+
+    if (this.email != null) {
+
+      formData.put("email", this.email);
+    }
+
+    if (this.preferredCurrencyCode != null) {
+
+      formData.put("preferred_currency_code", this.preferredCurrencyCode);
+    }
+
+    if (this.phone != null) {
+
+      formData.put("phone", this.phone);
+    }
+
+    if (this.company != null) {
+
+      formData.put("company", this.company);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.netTermDays != null) {
+
+      formData.put("net_term_days", this.netTermDays);
+    }
+
+    if (this.allowDirectDebit != null) {
+
+      formData.put("allow_direct_debit", this.allowDirectDebit);
+    }
+
+    if (this.vatNumber != null) {
+
+      formData.put("vat_number", this.vatNumber);
+    }
+
+    if (this.vatNumberPrefix != null) {
+
+      formData.put("vat_number_prefix", this.vatNumberPrefix);
+    }
+
+    if (this.entityIdentifierScheme != null) {
+
+      formData.put("entity_identifier_scheme", this.entityIdentifierScheme);
+    }
+
+    if (this.entityIdentifierStandard != null) {
+
+      formData.put("entity_identifier_standard", this.entityIdentifierStandard);
+    }
+
+    if (this.registeredForGst != null) {
+
+      formData.put("registered_for_gst", this.registeredForGst);
+    }
+
+    if (this.isEinvoiceEnabled != null) {
+
+      formData.put("is_einvoice_enabled", this.isEinvoiceEnabled);
+    }
+
+    if (this.einvoicingMethod != null) {
+
+      formData.put("einvoicing_method", this.einvoicingMethod);
+    }
+
+    if (this.taxability != null) {
+
+      formData.put("taxability", this.taxability);
+    }
+
+    if (this.exemptionDetails != null) {
+
+      formData.put("exemption_details", JsonUtil.toJson(this.exemptionDetails));
+    }
+
+    if (this.customerType != null) {
+
+      formData.put("customer_type", this.customerType);
+    }
+
+    if (this.clientProfileId != null) {
+
+      formData.put("client_profile_id", this.clientProfileId);
+    }
+
+    if (this.taxjarExemptionCategory != null) {
+
+      formData.put("taxjar_exemption_category", this.taxjarExemptionCategory);
+    }
+
+    if (this.businessCustomerWithoutVatNumber != null) {
+
+      formData.put("business_customer_without_vat_number", this.businessCustomerWithoutVatNumber);
+    }
+
+    if (this.locale != null) {
+
+      formData.put("locale", this.locale);
+    }
+
+    if (this.entityCode != null) {
+
+      formData.put("entity_code", this.entityCode);
+    }
+
+    if (this.exemptNumber != null) {
+
+      formData.put("exempt_number", this.exemptNumber);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.offlinePaymentMethod != null) {
+
+      formData.put("offline_payment_method", this.offlinePaymentMethod);
+    }
+
+    if (this.autoCloseInvoices != null) {
+
+      formData.put("auto_close_invoices", this.autoCloseInvoices);
+    }
+
+    if (this.consolidatedInvoicing != null) {
+
+      formData.put("consolidated_invoicing", this.consolidatedInvoicing);
+    }
+
+    if (this.tokenId != null) {
+
+      formData.put("token_id", this.tokenId);
+    }
+
+    if (this.businessEntityId != null) {
+
+      formData.put("business_entity_id", this.businessEntityId);
+    }
+
+    if (this.createdFromIp != null) {
+
+      formData.put("created_from_ip", this.createdFromIp);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.bankAccount != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.bankAccount.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "bank_account[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentMethod != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentMethod.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_method[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.entityIdentifiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.entityIdentifiers.size(); i++) {
+        EntityIdentifiersParams item = this.entityIdentifiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "entity_identifiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerCreateBuilder builder() {
+    return new CustomerCreateBuilder();
+  }
+
+  public static final class CustomerCreateBuilder {
+
+    private String id;
+
+    private String firstName;
+
+    private String lastName;
+
+    private String email;
+
+    private String preferredCurrencyCode;
+
+    private String phone;
+
+    private String company;
+
+    private AutoCollection autoCollection;
+
+    private Integer netTermDays;
+
+    private Boolean allowDirectDebit;
+
+    private String vatNumber;
+
+    private String vatNumberPrefix;
+
+    private String entityIdentifierScheme;
+
+    private String entityIdentifierStandard;
+
+    private Boolean registeredForGst;
+
+    private Boolean isEinvoiceEnabled;
+
+    private EinvoicingMethod einvoicingMethod;
+
+    private Taxability taxability;
+
+    private List<Object> exemptionDetails;
+
+    private CustomerType customerType;
+
+    private String clientProfileId;
+
+    private TaxjarExemptionCategory taxjarExemptionCategory;
+
+    private Boolean businessCustomerWithoutVatNumber;
+
+    private String locale;
+
+    private EntityCode entityCode;
+
+    private String exemptNumber;
+
+    private java.util.Map<String, Object> metaData;
+
+    private OfflinePaymentMethod offlinePaymentMethod;
+
+    private Boolean autoCloseInvoices;
+
+    private Boolean consolidatedInvoicing;
+
+    private String tokenId;
+
+    private String businessEntityId;
+
+    private String createdFromIp;
+
+    private String invoiceNotes;
+
+    private CardParams card;
+
+    private BankAccountParams bankAccount;
+
+    private PaymentMethodParams paymentMethod;
+
+    private PaymentIntentParams paymentIntent;
+
+    private BillingAddressParams billingAddress;
+
+    private List<EntityIdentifiersParams> entityIdentifiers;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerCreateBuilder() {}
+
+    public CustomerCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder firstName(String value) {
+      this.firstName = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder lastName(String value) {
+      this.lastName = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder email(String value) {
+      this.email = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder preferredCurrencyCode(String value) {
+      this.preferredCurrencyCode = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder phone(String value) {
+      this.phone = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder company(String value) {
+      this.company = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder netTermDays(Integer value) {
+      this.netTermDays = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder allowDirectDebit(Boolean value) {
+      this.allowDirectDebit = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder vatNumber(String value) {
+      this.vatNumber = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder vatNumberPrefix(String value) {
+      this.vatNumberPrefix = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder entityIdentifierScheme(String value) {
+      this.entityIdentifierScheme = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder entityIdentifierStandard(String value) {
+      this.entityIdentifierStandard = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder registeredForGst(Boolean value) {
+      this.registeredForGst = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder isEinvoiceEnabled(Boolean value) {
+      this.isEinvoiceEnabled = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder einvoicingMethod(EinvoicingMethod value) {
+      this.einvoicingMethod = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder taxability(Taxability value) {
+      this.taxability = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder exemptionDetails(List<Object> value) {
+      this.exemptionDetails = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder customerType(CustomerType value) {
+      this.customerType = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder clientProfileId(String value) {
+      this.clientProfileId = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder taxjarExemptionCategory(TaxjarExemptionCategory value) {
+      this.taxjarExemptionCategory = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder businessCustomerWithoutVatNumber(Boolean value) {
+      this.businessCustomerWithoutVatNumber = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder locale(String value) {
+      this.locale = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder entityCode(EntityCode value) {
+      this.entityCode = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder exemptNumber(String value) {
+      this.exemptNumber = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+      this.offlinePaymentMethod = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder autoCloseInvoices(Boolean value) {
+      this.autoCloseInvoices = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder consolidatedInvoicing(Boolean value) {
+      this.consolidatedInvoicing = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder tokenId(String value) {
+      this.tokenId = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder businessEntityId(String value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    @Deprecated
+    public CustomerCreateBuilder createdFromIp(String value) {
+      this.createdFromIp = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder bankAccount(BankAccountParams value) {
+      this.bankAccount = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder paymentMethod(PaymentMethodParams value) {
+      this.paymentMethod = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder entityIdentifiers(List<EntityIdentifiersParams> value) {
+      this.entityIdentifiers = value;
+      return this;
+    }
+
+    public CustomerCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public CustomerCreateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public CustomerCreateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerCreateBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerCreateBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerCreateBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerCreateParams build() {
+      return new CustomerCreateParams(this);
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum EinvoicingMethod {
+    AUTOMATIC("automatic"),
+
+    MANUAL("manual"),
+
+    SITE_DEFAULT("site_default"),
+
+    /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    EinvoicingMethod(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static EinvoicingMethod fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Taxability {
+    TAXABLE("taxable"),
+
+    EXEMPT("exempt"),
+
+    /** An enum member indicating that Taxability was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Taxability(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Taxability fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Taxability enumValue : Taxability.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum CustomerType {
+    RESIDENTIAL("residential"),
+
+    BUSINESS("business"),
+
+    SENIOR_CITIZEN("senior_citizen"),
+
+    INDUSTRIAL("industrial"),
+
+    /** An enum member indicating that CustomerType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CustomerType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CustomerType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CustomerType enumValue : CustomerType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TaxjarExemptionCategory {
+    WHOLESALE("wholesale"),
+
+    GOVERNMENT("government"),
+
+    OTHER("other"),
+
+    /**
+     * An enum member indicating that TaxjarExemptionCategory was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    TaxjarExemptionCategory(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TaxjarExemptionCategory fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TaxjarExemptionCategory enumValue : TaxjarExemptionCategory.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum EntityCode {
+    A("a"),
+
+    B("b"),
+
+    C("c"),
+
+    D("d"),
+
+    E("e"),
+
+    F("f"),
+
+    G("g"),
+
+    H("h"),
+
+    I("i"),
+
+    J("j"),
+
+    K("k"),
+
+    L("l"),
+
+    M("m"),
+
+    N("n"),
+
+    P("p"),
+
+    Q("q"),
+
+    R("r"),
+
+    MED_1("med1"),
+
+    MED_2("med2"),
+
+    /** An enum member indicating that EntityCode was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    EntityCode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static EntityCode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (EntityCode enumValue : EntityCode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum OfflinePaymentMethod {
+    NO_PREFERENCE("no_preference"),
+
+    CASH("cash"),
+
+    CHECK("check"),
+
+    BANK_TRANSFER("bank_transfer"),
+
+    ACH_CREDIT("ach_credit"),
+
+    SEPA_CREDIT("sepa_credit"),
+
+    BOLETO("boleto"),
+
+    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+    CUSTOM("custom"),
+
+    /**
+     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    OfflinePaymentMethod(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static OfflinePaymentMethod fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String tmpToken;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String number;
+
+    private final Integer expiryMonth;
+
+    private final Integer expiryYear;
+
+    private final String cvv;
+
+    private final PreferredScheme preferredScheme;
+
+    private final String billingAddr1;
+
+    private final String billingAddr2;
+
+    private final String billingCity;
+
+    private final String billingStateCode;
+
+    private final String billingState;
+
+    private final String billingZip;
+
+    private final String billingCountry;
+
+    private final String ipAddress;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.number = builder.number;
+
+      this.expiryMonth = builder.expiryMonth;
+
+      this.expiryYear = builder.expiryYear;
+
+      this.cvv = builder.cvv;
+
+      this.preferredScheme = builder.preferredScheme;
+
+      this.billingAddr1 = builder.billingAddr1;
+
+      this.billingAddr2 = builder.billingAddr2;
+
+      this.billingCity = builder.billingCity;
+
+      this.billingStateCode = builder.billingStateCode;
+
+      this.billingState = builder.billingState;
+
+      this.billingZip = builder.billingZip;
+
+      this.billingCountry = builder.billingCountry;
+
+      this.ipAddress = builder.ipAddress;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getNumber() {
+      return number;
+    }
+
+    public Integer getExpiryMonth() {
+      return expiryMonth;
+    }
+
+    public Integer getExpiryYear() {
+      return expiryYear;
+    }
+
+    public String getCvv() {
+      return cvv;
+    }
+
+    public PreferredScheme getPreferredScheme() {
+      return preferredScheme;
+    }
+
+    public String getBillingAddr1() {
+      return billingAddr1;
+    }
+
+    public String getBillingAddr2() {
+      return billingAddr2;
+    }
+
+    public String getBillingCity() {
+      return billingCity;
+    }
+
+    public String getBillingStateCode() {
+      return billingStateCode;
+    }
+
+    public String getBillingState() {
+      return billingState;
+    }
+
+    public String getBillingZip() {
+      return billingZip;
+    }
+
+    public String getBillingCountry() {
+      return billingCountry;
+    }
+
+    public String getIpAddress() {
+      return ipAddress;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.number != null) {
+
+        formData.put("number", this.number);
+      }
+
+      if (this.expiryMonth != null) {
+
+        formData.put("expiry_month", this.expiryMonth);
+      }
+
+      if (this.expiryYear != null) {
+
+        formData.put("expiry_year", this.expiryYear);
+      }
+
+      if (this.cvv != null) {
+
+        formData.put("cvv", this.cvv);
+      }
+
+      if (this.preferredScheme != null) {
+
+        formData.put("preferred_scheme", this.preferredScheme);
+      }
+
+      if (this.billingAddr1 != null) {
+
+        formData.put("billing_addr1", this.billingAddr1);
+      }
+
+      if (this.billingAddr2 != null) {
+
+        formData.put("billing_addr2", this.billingAddr2);
+      }
+
+      if (this.billingCity != null) {
+
+        formData.put("billing_city", this.billingCity);
+      }
+
+      if (this.billingStateCode != null) {
+
+        formData.put("billing_state_code", this.billingStateCode);
+      }
+
+      if (this.billingState != null) {
+
+        formData.put("billing_state", this.billingState);
+      }
+
+      if (this.billingZip != null) {
+
+        formData.put("billing_zip", this.billingZip);
+      }
+
+      if (this.billingCountry != null) {
+
+        formData.put("billing_country", this.billingCountry);
+      }
+
+      if (this.ipAddress != null) {
+
+        formData.put("ip_address", this.ipAddress);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String tmpToken;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String number;
+
+      private Integer expiryMonth;
+
+      private Integer expiryYear;
+
+      private String cvv;
+
+      private PreferredScheme preferredScheme;
+
+      private String billingAddr1;
+
+      private String billingAddr2;
+
+      private String billingCity;
+
+      private String billingStateCode;
+
+      private String billingState;
+
+      private String billingZip;
+
+      private String billingCountry;
+
+      private String ipAddress;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      @Deprecated
+      public CardBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public CardBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CardBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CardBuilder number(String value) {
+        this.number = value;
+        return this;
+      }
+
+      public CardBuilder expiryMonth(Integer value) {
+        this.expiryMonth = value;
+        return this;
+      }
+
+      public CardBuilder expiryYear(Integer value) {
+        this.expiryYear = value;
+        return this;
+      }
+
+      public CardBuilder cvv(String value) {
+        this.cvv = value;
+        return this;
+      }
+
+      public CardBuilder preferredScheme(PreferredScheme value) {
+        this.preferredScheme = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr1(String value) {
+        this.billingAddr1 = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr2(String value) {
+        this.billingAddr2 = value;
+        return this;
+      }
+
+      public CardBuilder billingCity(String value) {
+        this.billingCity = value;
+        return this;
+      }
+
+      public CardBuilder billingStateCode(String value) {
+        this.billingStateCode = value;
+        return this;
+      }
+
+      public CardBuilder billingState(String value) {
+        this.billingState = value;
+        return this;
+      }
+
+      public CardBuilder billingZip(String value) {
+        this.billingZip = value;
+        return this;
+      }
+
+      public CardBuilder billingCountry(String value) {
+        this.billingCountry = value;
+        return this;
+      }
+
+      @Deprecated
+      public CardBuilder ipAddress(String value) {
+        this.ipAddress = value;
+        return this;
+      }
+
+      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PreferredScheme {
+      CARTES_BANCAIRES("cartes_bancaires"),
+
+      MASTERCARD("mastercard"),
+
+      VISA("visa"),
+
+      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PreferredScheme(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PreferredScheme fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PreferredScheme enumValue : PreferredScheme.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BankAccountParams {
+
+    private final String gatewayAccountId;
+
+    private final String iban;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String company;
+
+    private final String email;
+
+    private final String phone;
+
+    private final String bankName;
+
+    private final String accountNumber;
+
+    private final String routingNumber;
+
+    private final String bankCode;
+
+    private final AccountType accountType;
+
+    private final AccountHolderType accountHolderType;
+
+    private final EcheckType echeckType;
+
+    private final String issuingCountry;
+
+    private final String swedishIdentityNumber;
+
+    private final java.util.Map<String, Object> billingAddress;
+
+    private BankAccountParams(BankAccountBuilder builder) {
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.iban = builder.iban;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.company = builder.company;
+
+      this.email = builder.email;
+
+      this.phone = builder.phone;
+
+      this.bankName = builder.bankName;
+
+      this.accountNumber = builder.accountNumber;
+
+      this.routingNumber = builder.routingNumber;
+
+      this.bankCode = builder.bankCode;
+
+      this.accountType = builder.accountType;
+
+      this.accountHolderType = builder.accountHolderType;
+
+      this.echeckType = builder.echeckType;
+
+      this.issuingCountry = builder.issuingCountry;
+
+      this.swedishIdentityNumber = builder.swedishIdentityNumber;
+
+      this.billingAddress = builder.billingAddress;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getIban() {
+      return iban;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getBankName() {
+      return bankName;
+    }
+
+    public String getAccountNumber() {
+      return accountNumber;
+    }
+
+    public String getRoutingNumber() {
+      return routingNumber;
+    }
+
+    public String getBankCode() {
+      return bankCode;
+    }
+
+    public AccountType getAccountType() {
+      return accountType;
+    }
+
+    public AccountHolderType getAccountHolderType() {
+      return accountHolderType;
+    }
+
+    public EcheckType getEcheckType() {
+      return echeckType;
+    }
+
+    public String getIssuingCountry() {
+      return issuingCountry;
+    }
+
+    public String getSwedishIdentityNumber() {
+      return swedishIdentityNumber;
+    }
+
+    public java.util.Map<String, Object> getBillingAddress() {
+      return billingAddress;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.iban != null) {
+
+        formData.put("iban", this.iban);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.bankName != null) {
+
+        formData.put("bank_name", this.bankName);
+      }
+
+      if (this.accountNumber != null) {
+
+        formData.put("account_number", this.accountNumber);
+      }
+
+      if (this.routingNumber != null) {
+
+        formData.put("routing_number", this.routingNumber);
+      }
+
+      if (this.bankCode != null) {
+
+        formData.put("bank_code", this.bankCode);
+      }
+
+      if (this.accountType != null) {
+
+        formData.put("account_type", this.accountType);
+      }
+
+      if (this.accountHolderType != null) {
+
+        formData.put("account_holder_type", this.accountHolderType);
+      }
+
+      if (this.echeckType != null) {
+
+        formData.put("echeck_type", this.echeckType);
+      }
+
+      if (this.issuingCountry != null) {
+
+        formData.put("issuing_country", this.issuingCountry);
+      }
+
+      if (this.swedishIdentityNumber != null) {
+
+        formData.put("swedish_identity_number", this.swedishIdentityNumber);
+      }
+
+      if (this.billingAddress != null) {
+
+        formData.put("billing_address", JsonUtil.toJson(this.billingAddress));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BankAccountParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BankAccountBuilder builder() {
+      return new BankAccountBuilder();
+    }
+
+    public static final class BankAccountBuilder {
+
+      private String gatewayAccountId;
+
+      private String iban;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String company;
+
+      private String email;
+
+      private String phone;
+
+      private String bankName;
+
+      private String accountNumber;
+
+      private String routingNumber;
+
+      private String bankCode;
+
+      private AccountType accountType;
+
+      private AccountHolderType accountHolderType;
+
+      private EcheckType echeckType;
+
+      private String issuingCountry;
+
+      private String swedishIdentityNumber;
+
+      private java.util.Map<String, Object> billingAddress;
+
+      private BankAccountBuilder() {}
+
+      public BankAccountBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public BankAccountBuilder iban(String value) {
+        this.iban = value;
+        return this;
+      }
+
+      public BankAccountBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BankAccountBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BankAccountBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BankAccountBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BankAccountBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BankAccountBuilder bankName(String value) {
+        this.bankName = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountNumber(String value) {
+        this.accountNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder routingNumber(String value) {
+        this.routingNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder bankCode(String value) {
+        this.bankCode = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountType(AccountType value) {
+        this.accountType = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountHolderType(AccountHolderType value) {
+        this.accountHolderType = value;
+        return this;
+      }
+
+      public BankAccountBuilder echeckType(EcheckType value) {
+        this.echeckType = value;
+        return this;
+      }
+
+      public BankAccountBuilder issuingCountry(String value) {
+        this.issuingCountry = value;
+        return this;
+      }
+
+      public BankAccountBuilder swedishIdentityNumber(String value) {
+        this.swedishIdentityNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder billingAddress(java.util.Map<String, Object> value) {
+        this.billingAddress = value;
+        return this;
+      }
+
+      public BankAccountParams build() {
+        return new BankAccountParams(this);
+      }
+    }
+
+    public enum AccountType {
+      CHECKING("checking"),
+
+      SAVINGS("savings"),
+
+      BUSINESS_CHECKING("business_checking"),
+
+      CURRENT("current"),
+
+      /** An enum member indicating that AccountType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AccountType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AccountType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AccountType enumValue : AccountType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum AccountHolderType {
+      INDIVIDUAL("individual"),
+
+      COMPANY("company"),
+
+      /**
+       * An enum member indicating that AccountHolderType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      AccountHolderType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AccountHolderType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AccountHolderType enumValue : AccountHolderType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum EcheckType {
+      WEB("web"),
+
+      PPD("ppd"),
+
+      CCD("ccd"),
+
+      /** An enum member indicating that EcheckType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EcheckType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EcheckType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EcheckType enumValue : EcheckType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentMethodParams {
+
+    private final Type type;
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String referenceId;
+
+    private final String tmpToken;
+
+    private final String issuingCountry;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentMethodParams(PaymentMethodBuilder builder) {
+
+      this.type = builder.type;
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.referenceId = builder.referenceId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.issuingCountry = builder.issuingCountry;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getIssuingCountry() {
+      return issuingCountry;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.issuingCountry != null) {
+
+        formData.put("issuing_country", this.issuingCountry);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentMethodBuilder builder() {
+      return new PaymentMethodBuilder();
+    }
+
+    public static final class PaymentMethodBuilder {
+
+      private Type type;
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String referenceId;
+
+      private String tmpToken;
+
+      private String issuingCountry;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentMethodBuilder() {}
+
+      public PaymentMethodBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentMethodBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder issuingCountry(String value) {
+        this.issuingCountry = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentMethodParams build() {
+        return new PaymentMethodParams(this);
+      }
+    }
+
+    public enum Type {
+      CARD("card"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      GENERIC("generic"),
+
+      ALIPAY("alipay"),
+
+      UNIONPAY("unionpay"),
+
+      APPLE_PAY("apple_pay"),
+
+      WECHAT_PAY("wechat_pay"),
+
+      IDEAL("ideal"),
+
+      GOOGLE_PAY("google_pay"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GIROPAY("giropay"),
+
+      DOTPAY("dotpay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      VENMO("venmo"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      GOCARDLESS("gocardless"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class EntityIdentifiersParams {
+
+    private final String id;
+
+    private final String scheme;
+
+    private final String value;
+
+    private final String standard;
+
+    private EntityIdentifiersParams(EntityIdentifiersBuilder builder) {
+
+      this.id = builder.id;
+
+      this.scheme = builder.scheme;
+
+      this.value = builder.value;
+
+      this.standard = builder.standard;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getScheme() {
+      return scheme;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public String getStandard() {
+      return standard;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.scheme != null) {
+
+        formData.put("scheme", this.scheme);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      if (this.standard != null) {
+
+        formData.put("standard", this.standard);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EntityIdentifiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EntityIdentifiersBuilder builder() {
+      return new EntityIdentifiersBuilder();
+    }
+
+    public static final class EntityIdentifiersBuilder {
+
+      private String id;
+
+      private String scheme;
+
+      private String value;
+
+      private String standard;
+
+      private EntityIdentifiersBuilder() {}
+
+      public EntityIdentifiersBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder scheme(String value) {
+        this.scheme = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder standard(String value) {
+        this.standard = value;
+        return this;
+      }
+
+      public EntityIdentifiersParams build() {
+        return new EntityIdentifiersParams(this);
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerDeductPromotionalCreditsParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerDeductPromotionalCreditsParams.java
new file mode 100644
index 00000000..a63a1d67
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerDeductPromotionalCreditsParams.java
@@ -0,0 +1,240 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerDeductPromotionalCreditsParams {
+
+  private final Long amount;
+
+  private final String currencyCode;
+
+  private final String description;
+
+  private final CreditType creditType;
+
+  private final String reference;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerDeductPromotionalCreditsParams(CustomerDeductPromotionalCreditsBuilder builder) {
+
+    this.amount = builder.amount;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.description = builder.description;
+
+    this.creditType = builder.creditType;
+
+    this.reference = builder.reference;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public CreditType getCreditType() {
+    return creditType;
+  }
+
+  public String getReference() {
+    return reference;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.creditType != null) {
+
+      formData.put("credit_type", this.creditType);
+    }
+
+    if (this.reference != null) {
+
+      formData.put("reference", this.reference);
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerDeductPromotionalCreditsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerDeductPromotionalCreditsBuilder builder() {
+    return new CustomerDeductPromotionalCreditsBuilder();
+  }
+
+  public static final class CustomerDeductPromotionalCreditsBuilder {
+
+    private Long amount;
+
+    private String currencyCode;
+
+    private String description;
+
+    private CreditType creditType;
+
+    private String reference;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerDeductPromotionalCreditsBuilder() {}
+
+    public CustomerDeductPromotionalCreditsBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public CustomerDeductPromotionalCreditsBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public CustomerDeductPromotionalCreditsBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public CustomerDeductPromotionalCreditsBuilder creditType(CreditType value) {
+      this.creditType = value;
+      return this;
+    }
+
+    public CustomerDeductPromotionalCreditsBuilder reference(String value) {
+      this.reference = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerDeductPromotionalCreditsBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerDeductPromotionalCreditsBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerDeductPromotionalCreditsBuilder consentFields(
+        Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerDeductPromotionalCreditsParams build() {
+      return new CustomerDeductPromotionalCreditsParams(this);
+    }
+  }
+
+  public enum CreditType {
+    LOYALTY_CREDITS("loyalty_credits"),
+
+    REFERRAL_REWARDS("referral_rewards"),
+
+    GENERAL("general"),
+
+    /** An enum member indicating that CreditType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CreditType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CreditType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CreditType enumValue : CreditType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerDeleteContactParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerDeleteContactParams.java
new file mode 100644
index 00000000..e4538054
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerDeleteContactParams.java
@@ -0,0 +1,182 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerDeleteContactParams {
+
+  private final ContactParams contact;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerDeleteContactParams(CustomerDeleteContactBuilder builder) {
+
+    this.contact = builder.contact;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public ContactParams getContact() {
+    return contact;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.contact != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contact.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contact[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerDeleteContactParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerDeleteContactBuilder builder() {
+    return new CustomerDeleteContactBuilder();
+  }
+
+  public static final class CustomerDeleteContactBuilder {
+
+    private ContactParams contact;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerDeleteContactBuilder() {}
+
+    public CustomerDeleteContactBuilder contact(ContactParams value) {
+      this.contact = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerDeleteContactBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerDeleteContactBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerDeleteContactBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerDeleteContactParams build() {
+      return new CustomerDeleteContactParams(this);
+    }
+  }
+
+  public static final class ContactParams {
+
+    private final String id;
+
+    private ContactParams(ContactBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContactParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContactBuilder builder() {
+      return new ContactBuilder();
+    }
+
+    public static final class ContactBuilder {
+
+      private String id;
+
+      private ContactBuilder() {}
+
+      public ContactBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public ContactParams build() {
+        return new ContactParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerDeleteParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerDeleteParams.java
new file mode 100644
index 00000000..b2e587d0
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerDeleteParams.java
@@ -0,0 +1,129 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerDeleteParams {
+
+  private final Boolean deletePaymentMethod;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerDeleteParams(CustomerDeleteBuilder builder) {
+
+    this.deletePaymentMethod = builder.deletePaymentMethod;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public Boolean getDeletePaymentMethod() {
+    return deletePaymentMethod;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.deletePaymentMethod != null) {
+
+      formData.put("delete_payment_method", this.deletePaymentMethod);
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerDeleteBuilder builder() {
+    return new CustomerDeleteBuilder();
+  }
+
+  public static final class CustomerDeleteBuilder {
+
+    private Boolean deletePaymentMethod;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerDeleteBuilder() {}
+
+    public CustomerDeleteBuilder deletePaymentMethod(Boolean value) {
+      this.deletePaymentMethod = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerDeleteBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerDeleteBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerDeleteBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerDeleteParams build() {
+      return new CustomerDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerDeleteRelationshipParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerDeleteRelationshipParams.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/models/customer/params/CustomerDeleteRelationshipParams.java
rename to src/main/java/com/chargebee/v4/models/customer/params/CustomerDeleteRelationshipParams.java
index 1e27eba2..dd91fbd9 100644
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerDeleteRelationshipParams.java
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerDeleteRelationshipParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.customer.params;
+package com.chargebee.v4.models.customer.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class CustomerDeleteRelationshipParams {
 
-  private final Map<String, Object> formData;
-
-  private CustomerDeleteRelationshipParams(CustomerDeleteRelationshipBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private CustomerDeleteRelationshipParams(CustomerDeleteRelationshipBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static CustomerDeleteRelationshipBuilder builder() {
   }
 
   public static final class CustomerDeleteRelationshipBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private CustomerDeleteRelationshipBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerHierarchyParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerHierarchyParams.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/customer/params/CustomerHierarchyParams.java
rename to src/main/java/com/chargebee/v4/models/customer/params/CustomerHierarchyParams.java
index b1b825cf..dec61533 100644
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerHierarchyParams.java
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerHierarchyParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customer.params;
+package com.chargebee.v4.models.customer.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerListHierarchyDetailParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerListHierarchyDetailParams.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/customer/params/CustomerListHierarchyDetailParams.java
rename to src/main/java/com/chargebee/v4/models/customer/params/CustomerListHierarchyDetailParams.java
index effc9f68..b1e75d38 100644
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerListHierarchyDetailParams.java
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerListHierarchyDetailParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customer.params;
+package com.chargebee.v4.models.customer.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerListParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/customer/params/CustomerListParams.java
rename to src/main/java/com/chargebee/v4/models/customer/params/CustomerListParams.java
index e738b726..977fec9b 100644
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerListParams.java
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customer.params;
+package com.chargebee.v4.models.customer.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerMergeParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerMergeParams.java
new file mode 100644
index 00000000..0df976ef
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerMergeParams.java
@@ -0,0 +1,149 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerMergeParams {
+
+  private final String fromCustomerId;
+
+  private final String toCustomerId;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerMergeParams(CustomerMergeBuilder builder) {
+
+    this.fromCustomerId = builder.fromCustomerId;
+
+    this.toCustomerId = builder.toCustomerId;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public String getFromCustomerId() {
+    return fromCustomerId;
+  }
+
+  public String getToCustomerId() {
+    return toCustomerId;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.fromCustomerId != null) {
+
+      formData.put("from_customer_id", this.fromCustomerId);
+    }
+
+    if (this.toCustomerId != null) {
+
+      formData.put("to_customer_id", this.toCustomerId);
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerMergeParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerMergeBuilder builder() {
+    return new CustomerMergeBuilder();
+  }
+
+  public static final class CustomerMergeBuilder {
+
+    private String fromCustomerId;
+
+    private String toCustomerId;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerMergeBuilder() {}
+
+    public CustomerMergeBuilder fromCustomerId(String value) {
+      this.fromCustomerId = value;
+      return this;
+    }
+
+    public CustomerMergeBuilder toCustomerId(String value) {
+      this.toCustomerId = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerMergeBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerMergeBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerMergeBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerMergeParams build() {
+      return new CustomerMergeParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerMoveParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerMoveParams.java
new file mode 100644
index 00000000..90f12fc4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerMoveParams.java
@@ -0,0 +1,149 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerMoveParams {
+
+  private final String idAtFromSite;
+
+  private final String fromSite;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerMoveParams(CustomerMoveBuilder builder) {
+
+    this.idAtFromSite = builder.idAtFromSite;
+
+    this.fromSite = builder.fromSite;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public String getIdAtFromSite() {
+    return idAtFromSite;
+  }
+
+  public String getFromSite() {
+    return fromSite;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.idAtFromSite != null) {
+
+      formData.put("id_at_from_site", this.idAtFromSite);
+    }
+
+    if (this.fromSite != null) {
+
+      formData.put("from_site", this.fromSite);
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerMoveParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerMoveBuilder builder() {
+    return new CustomerMoveBuilder();
+  }
+
+  public static final class CustomerMoveBuilder {
+
+    private String idAtFromSite;
+
+    private String fromSite;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerMoveBuilder() {}
+
+    public CustomerMoveBuilder idAtFromSite(String value) {
+      this.idAtFromSite = value;
+      return this;
+    }
+
+    public CustomerMoveBuilder fromSite(String value) {
+      this.fromSite = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerMoveBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerMoveBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerMoveBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerMoveParams build() {
+      return new CustomerMoveParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerRecordExcessPaymentParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerRecordExcessPaymentParams.java
new file mode 100644
index 00000000..7598b007
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerRecordExcessPaymentParams.java
@@ -0,0 +1,361 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class CustomerRecordExcessPaymentParams {
+
+  private final String comment;
+
+  private final TransactionParams transaction;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerRecordExcessPaymentParams(CustomerRecordExcessPaymentBuilder builder) {
+
+    this.comment = builder.comment;
+
+    this.transaction = builder.transaction;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public TransactionParams getTransaction() {
+    return transaction;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.transaction != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.transaction.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "transaction[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerRecordExcessPaymentParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerRecordExcessPaymentBuilder builder() {
+    return new CustomerRecordExcessPaymentBuilder();
+  }
+
+  public static final class CustomerRecordExcessPaymentBuilder {
+
+    private String comment;
+
+    private TransactionParams transaction;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerRecordExcessPaymentBuilder() {}
+
+    public CustomerRecordExcessPaymentBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public CustomerRecordExcessPaymentBuilder transaction(TransactionParams value) {
+      this.transaction = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerRecordExcessPaymentBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerRecordExcessPaymentBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerRecordExcessPaymentBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerRecordExcessPaymentParams build() {
+      return new CustomerRecordExcessPaymentParams(this);
+    }
+  }
+
+  public static final class TransactionParams {
+
+    private final String id;
+
+    private final Long amount;
+
+    private final String currencyCode;
+
+    private final Timestamp date;
+
+    private final PaymentMethod paymentMethod;
+
+    private final String referenceNumber;
+
+    private final String customPaymentMethodId;
+
+    private TransactionParams(TransactionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.amount = builder.amount;
+
+      this.currencyCode = builder.currencyCode;
+
+      this.date = builder.date;
+
+      this.paymentMethod = builder.paymentMethod;
+
+      this.referenceNumber = builder.referenceNumber;
+
+      this.customPaymentMethodId = builder.customPaymentMethodId;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getCurrencyCode() {
+      return currencyCode;
+    }
+
+    public Timestamp getDate() {
+      return date;
+    }
+
+    public PaymentMethod getPaymentMethod() {
+      return paymentMethod;
+    }
+
+    public String getReferenceNumber() {
+      return referenceNumber;
+    }
+
+    public String getCustomPaymentMethodId() {
+      return customPaymentMethodId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.currencyCode != null) {
+
+        formData.put("currency_code", this.currencyCode);
+      }
+
+      if (this.date != null) {
+
+        formData.put("date", this.date);
+      }
+
+      if (this.paymentMethod != null) {
+
+        formData.put("payment_method", this.paymentMethod);
+      }
+
+      if (this.referenceNumber != null) {
+
+        formData.put("reference_number", this.referenceNumber);
+      }
+
+      if (this.customPaymentMethodId != null) {
+
+        formData.put("custom_payment_method_id", this.customPaymentMethodId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TransactionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TransactionBuilder builder() {
+      return new TransactionBuilder();
+    }
+
+    public static final class TransactionBuilder {
+
+      private String id;
+
+      private Long amount;
+
+      private String currencyCode;
+
+      private Timestamp date;
+
+      private PaymentMethod paymentMethod;
+
+      private String referenceNumber;
+
+      private String customPaymentMethodId;
+
+      private TransactionBuilder() {}
+
+      public TransactionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public TransactionBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public TransactionBuilder currencyCode(String value) {
+        this.currencyCode = value;
+        return this;
+      }
+
+      public TransactionBuilder date(Timestamp value) {
+        this.date = value;
+        return this;
+      }
+
+      public TransactionBuilder paymentMethod(PaymentMethod value) {
+        this.paymentMethod = value;
+        return this;
+      }
+
+      public TransactionBuilder referenceNumber(String value) {
+        this.referenceNumber = value;
+        return this;
+      }
+
+      public TransactionBuilder customPaymentMethodId(String value) {
+        this.customPaymentMethodId = value;
+        return this;
+      }
+
+      public TransactionParams build() {
+        return new TransactionParams(this);
+      }
+    }
+
+    public enum PaymentMethod {
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      OTHER("other"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethod enumValue : PaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerRelationshipsParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerRelationshipsParams.java
new file mode 100644
index 00000000..154a893f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerRelationshipsParams.java
@@ -0,0 +1,627 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerRelationshipsParams {
+
+  private final String parentId;
+
+  private final String paymentOwnerId;
+
+  private final String invoiceOwnerId;
+
+  private final Boolean useDefaultHierarchySettings;
+
+  private final ParentAccountAccessParams parentAccountAccess;
+
+  private final ChildAccountAccessParams childAccountAccess;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerRelationshipsParams(CustomerRelationshipsBuilder builder) {
+
+    this.parentId = builder.parentId;
+
+    this.paymentOwnerId = builder.paymentOwnerId;
+
+    this.invoiceOwnerId = builder.invoiceOwnerId;
+
+    this.useDefaultHierarchySettings = builder.useDefaultHierarchySettings;
+
+    this.parentAccountAccess = builder.parentAccountAccess;
+
+    this.childAccountAccess = builder.childAccountAccess;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public String getParentId() {
+    return parentId;
+  }
+
+  public String getPaymentOwnerId() {
+    return paymentOwnerId;
+  }
+
+  public String getInvoiceOwnerId() {
+    return invoiceOwnerId;
+  }
+
+  public Boolean getUseDefaultHierarchySettings() {
+    return useDefaultHierarchySettings;
+  }
+
+  public ParentAccountAccessParams getParentAccountAccess() {
+    return parentAccountAccess;
+  }
+
+  public ChildAccountAccessParams getChildAccountAccess() {
+    return childAccountAccess;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.parentId != null) {
+
+      formData.put("parent_id", this.parentId);
+    }
+
+    if (this.paymentOwnerId != null) {
+
+      formData.put("payment_owner_id", this.paymentOwnerId);
+    }
+
+    if (this.invoiceOwnerId != null) {
+
+      formData.put("invoice_owner_id", this.invoiceOwnerId);
+    }
+
+    if (this.useDefaultHierarchySettings != null) {
+
+      formData.put("use_default_hierarchy_settings", this.useDefaultHierarchySettings);
+    }
+
+    if (this.parentAccountAccess != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.parentAccountAccess.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "parent_account_access[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.childAccountAccess != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.childAccountAccess.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "child_account_access[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerRelationshipsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerRelationshipsBuilder builder() {
+    return new CustomerRelationshipsBuilder();
+  }
+
+  public static final class CustomerRelationshipsBuilder {
+
+    private String parentId;
+
+    private String paymentOwnerId;
+
+    private String invoiceOwnerId;
+
+    private Boolean useDefaultHierarchySettings;
+
+    private ParentAccountAccessParams parentAccountAccess;
+
+    private ChildAccountAccessParams childAccountAccess;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerRelationshipsBuilder() {}
+
+    public CustomerRelationshipsBuilder parentId(String value) {
+      this.parentId = value;
+      return this;
+    }
+
+    public CustomerRelationshipsBuilder paymentOwnerId(String value) {
+      this.paymentOwnerId = value;
+      return this;
+    }
+
+    public CustomerRelationshipsBuilder invoiceOwnerId(String value) {
+      this.invoiceOwnerId = value;
+      return this;
+    }
+
+    public CustomerRelationshipsBuilder useDefaultHierarchySettings(Boolean value) {
+      this.useDefaultHierarchySettings = value;
+      return this;
+    }
+
+    public CustomerRelationshipsBuilder parentAccountAccess(ParentAccountAccessParams value) {
+      this.parentAccountAccess = value;
+      return this;
+    }
+
+    public CustomerRelationshipsBuilder childAccountAccess(ChildAccountAccessParams value) {
+      this.childAccountAccess = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerRelationshipsBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerRelationshipsBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerRelationshipsBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerRelationshipsParams build() {
+      return new CustomerRelationshipsParams(this);
+    }
+  }
+
+  public static final class ParentAccountAccessParams {
+
+    private final PortalEditChildSubscriptions portalEditChildSubscriptions;
+
+    private final PortalDownloadChildInvoices portalDownloadChildInvoices;
+
+    private final Boolean sendSubscriptionEmails;
+
+    private final Boolean sendPaymentEmails;
+
+    private final Boolean sendInvoiceEmails;
+
+    private ParentAccountAccessParams(ParentAccountAccessBuilder builder) {
+
+      this.portalEditChildSubscriptions = builder.portalEditChildSubscriptions;
+
+      this.portalDownloadChildInvoices = builder.portalDownloadChildInvoices;
+
+      this.sendSubscriptionEmails = builder.sendSubscriptionEmails;
+
+      this.sendPaymentEmails = builder.sendPaymentEmails;
+
+      this.sendInvoiceEmails = builder.sendInvoiceEmails;
+    }
+
+    public PortalEditChildSubscriptions getPortalEditChildSubscriptions() {
+      return portalEditChildSubscriptions;
+    }
+
+    public PortalDownloadChildInvoices getPortalDownloadChildInvoices() {
+      return portalDownloadChildInvoices;
+    }
+
+    public Boolean getSendSubscriptionEmails() {
+      return sendSubscriptionEmails;
+    }
+
+    public Boolean getSendPaymentEmails() {
+      return sendPaymentEmails;
+    }
+
+    public Boolean getSendInvoiceEmails() {
+      return sendInvoiceEmails;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.portalEditChildSubscriptions != null) {
+
+        formData.put("portal_edit_child_subscriptions", this.portalEditChildSubscriptions);
+      }
+
+      if (this.portalDownloadChildInvoices != null) {
+
+        formData.put("portal_download_child_invoices", this.portalDownloadChildInvoices);
+      }
+
+      if (this.sendSubscriptionEmails != null) {
+
+        formData.put("send_subscription_emails", this.sendSubscriptionEmails);
+      }
+
+      if (this.sendPaymentEmails != null) {
+
+        formData.put("send_payment_emails", this.sendPaymentEmails);
+      }
+
+      if (this.sendInvoiceEmails != null) {
+
+        formData.put("send_invoice_emails", this.sendInvoiceEmails);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ParentAccountAccessParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ParentAccountAccessBuilder builder() {
+      return new ParentAccountAccessBuilder();
+    }
+
+    public static final class ParentAccountAccessBuilder {
+
+      private PortalEditChildSubscriptions portalEditChildSubscriptions;
+
+      private PortalDownloadChildInvoices portalDownloadChildInvoices;
+
+      private Boolean sendSubscriptionEmails;
+
+      private Boolean sendPaymentEmails;
+
+      private Boolean sendInvoiceEmails;
+
+      private ParentAccountAccessBuilder() {}
+
+      public ParentAccountAccessBuilder portalEditChildSubscriptions(
+          PortalEditChildSubscriptions value) {
+        this.portalEditChildSubscriptions = value;
+        return this;
+      }
+
+      public ParentAccountAccessBuilder portalDownloadChildInvoices(
+          PortalDownloadChildInvoices value) {
+        this.portalDownloadChildInvoices = value;
+        return this;
+      }
+
+      public ParentAccountAccessBuilder sendSubscriptionEmails(Boolean value) {
+        this.sendSubscriptionEmails = value;
+        return this;
+      }
+
+      public ParentAccountAccessBuilder sendPaymentEmails(Boolean value) {
+        this.sendPaymentEmails = value;
+        return this;
+      }
+
+      public ParentAccountAccessBuilder sendInvoiceEmails(Boolean value) {
+        this.sendInvoiceEmails = value;
+        return this;
+      }
+
+      public ParentAccountAccessParams build() {
+        return new ParentAccountAccessParams(this);
+      }
+    }
+
+    public enum PortalEditChildSubscriptions {
+      YES("yes"),
+
+      VIEW_ONLY("view_only"),
+
+      NO("no"),
+
+      /**
+       * An enum member indicating that PortalEditChildSubscriptions was instantiated with an
+       * unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PortalEditChildSubscriptions(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PortalEditChildSubscriptions fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PortalEditChildSubscriptions enumValue : PortalEditChildSubscriptions.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PortalDownloadChildInvoices {
+      YES("yes"),
+
+      VIEW_ONLY("view_only"),
+
+      NO("no"),
+
+      /**
+       * An enum member indicating that PortalDownloadChildInvoices was instantiated with an unknown
+       * value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PortalDownloadChildInvoices(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PortalDownloadChildInvoices fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PortalDownloadChildInvoices enumValue : PortalDownloadChildInvoices.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChildAccountAccessParams {
+
+    private final PortalEditSubscriptions portalEditSubscriptions;
+
+    private final PortalDownloadInvoices portalDownloadInvoices;
+
+    private final Boolean sendSubscriptionEmails;
+
+    private final Boolean sendPaymentEmails;
+
+    private final Boolean sendInvoiceEmails;
+
+    private ChildAccountAccessParams(ChildAccountAccessBuilder builder) {
+
+      this.portalEditSubscriptions = builder.portalEditSubscriptions;
+
+      this.portalDownloadInvoices = builder.portalDownloadInvoices;
+
+      this.sendSubscriptionEmails = builder.sendSubscriptionEmails;
+
+      this.sendPaymentEmails = builder.sendPaymentEmails;
+
+      this.sendInvoiceEmails = builder.sendInvoiceEmails;
+    }
+
+    public PortalEditSubscriptions getPortalEditSubscriptions() {
+      return portalEditSubscriptions;
+    }
+
+    public PortalDownloadInvoices getPortalDownloadInvoices() {
+      return portalDownloadInvoices;
+    }
+
+    public Boolean getSendSubscriptionEmails() {
+      return sendSubscriptionEmails;
+    }
+
+    public Boolean getSendPaymentEmails() {
+      return sendPaymentEmails;
+    }
+
+    public Boolean getSendInvoiceEmails() {
+      return sendInvoiceEmails;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.portalEditSubscriptions != null) {
+
+        formData.put("portal_edit_subscriptions", this.portalEditSubscriptions);
+      }
+
+      if (this.portalDownloadInvoices != null) {
+
+        formData.put("portal_download_invoices", this.portalDownloadInvoices);
+      }
+
+      if (this.sendSubscriptionEmails != null) {
+
+        formData.put("send_subscription_emails", this.sendSubscriptionEmails);
+      }
+
+      if (this.sendPaymentEmails != null) {
+
+        formData.put("send_payment_emails", this.sendPaymentEmails);
+      }
+
+      if (this.sendInvoiceEmails != null) {
+
+        formData.put("send_invoice_emails", this.sendInvoiceEmails);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChildAccountAccessParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChildAccountAccessBuilder builder() {
+      return new ChildAccountAccessBuilder();
+    }
+
+    public static final class ChildAccountAccessBuilder {
+
+      private PortalEditSubscriptions portalEditSubscriptions;
+
+      private PortalDownloadInvoices portalDownloadInvoices;
+
+      private Boolean sendSubscriptionEmails;
+
+      private Boolean sendPaymentEmails;
+
+      private Boolean sendInvoiceEmails;
+
+      private ChildAccountAccessBuilder() {}
+
+      public ChildAccountAccessBuilder portalEditSubscriptions(PortalEditSubscriptions value) {
+        this.portalEditSubscriptions = value;
+        return this;
+      }
+
+      public ChildAccountAccessBuilder portalDownloadInvoices(PortalDownloadInvoices value) {
+        this.portalDownloadInvoices = value;
+        return this;
+      }
+
+      public ChildAccountAccessBuilder sendSubscriptionEmails(Boolean value) {
+        this.sendSubscriptionEmails = value;
+        return this;
+      }
+
+      public ChildAccountAccessBuilder sendPaymentEmails(Boolean value) {
+        this.sendPaymentEmails = value;
+        return this;
+      }
+
+      public ChildAccountAccessBuilder sendInvoiceEmails(Boolean value) {
+        this.sendInvoiceEmails = value;
+        return this;
+      }
+
+      public ChildAccountAccessParams build() {
+        return new ChildAccountAccessParams(this);
+      }
+    }
+
+    public enum PortalEditSubscriptions {
+      YES("yes"),
+
+      VIEW_ONLY("view_only"),
+
+      /**
+       * An enum member indicating that PortalEditSubscriptions was instantiated with an unknown
+       * value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PortalEditSubscriptions(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PortalEditSubscriptions fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PortalEditSubscriptions enumValue : PortalEditSubscriptions.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PortalDownloadInvoices {
+      YES("yes"),
+
+      VIEW_ONLY("view_only"),
+
+      NO("no"),
+
+      /**
+       * An enum member indicating that PortalDownloadInvoices was instantiated with an unknown
+       * value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PortalDownloadInvoices(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PortalDownloadInvoices fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PortalDownloadInvoices enumValue : PortalDownloadInvoices.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerRetrieveParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/customer/params/CustomerRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/customer/params/CustomerRetrieveParams.java
index 2071e3c4..5a843818 100644
--- a/src/main/java/com/chargebee/v4/core/models/customer/params/CustomerRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customer.params;
+package com.chargebee.v4.models.customer.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerSetPromotionalCreditsParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerSetPromotionalCreditsParams.java
new file mode 100644
index 00000000..34cbcef0
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerSetPromotionalCreditsParams.java
@@ -0,0 +1,239 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerSetPromotionalCreditsParams {
+
+  private final Long amount;
+
+  private final String currencyCode;
+
+  private final String description;
+
+  private final CreditType creditType;
+
+  private final String reference;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerSetPromotionalCreditsParams(CustomerSetPromotionalCreditsBuilder builder) {
+
+    this.amount = builder.amount;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.description = builder.description;
+
+    this.creditType = builder.creditType;
+
+    this.reference = builder.reference;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public CreditType getCreditType() {
+    return creditType;
+  }
+
+  public String getReference() {
+    return reference;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.creditType != null) {
+
+      formData.put("credit_type", this.creditType);
+    }
+
+    if (this.reference != null) {
+
+      formData.put("reference", this.reference);
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerSetPromotionalCreditsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerSetPromotionalCreditsBuilder builder() {
+    return new CustomerSetPromotionalCreditsBuilder();
+  }
+
+  public static final class CustomerSetPromotionalCreditsBuilder {
+
+    private Long amount;
+
+    private String currencyCode;
+
+    private String description;
+
+    private CreditType creditType;
+
+    private String reference;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerSetPromotionalCreditsBuilder() {}
+
+    public CustomerSetPromotionalCreditsBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public CustomerSetPromotionalCreditsBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public CustomerSetPromotionalCreditsBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public CustomerSetPromotionalCreditsBuilder creditType(CreditType value) {
+      this.creditType = value;
+      return this;
+    }
+
+    public CustomerSetPromotionalCreditsBuilder reference(String value) {
+      this.reference = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerSetPromotionalCreditsBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerSetPromotionalCreditsBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerSetPromotionalCreditsBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerSetPromotionalCreditsParams build() {
+      return new CustomerSetPromotionalCreditsParams(this);
+    }
+  }
+
+  public enum CreditType {
+    LOYALTY_CREDITS("loyalty_credits"),
+
+    REFERRAL_REWARDS("referral_rewards"),
+
+    GENERAL("general"),
+
+    /** An enum member indicating that CreditType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CreditType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CreditType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CreditType enumValue : CreditType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdateBillingInfoParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdateBillingInfoParams.java
new file mode 100644
index 00000000..398f0be3
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdateBillingInfoParams.java
@@ -0,0 +1,972 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class CustomerUpdateBillingInfoParams {
+
+  private final String vatNumber;
+
+  private final String vatNumberPrefix;
+
+  private final String entityIdentifierScheme;
+
+  private final String entityIdentifierStandard;
+
+  private final Boolean registeredForGst;
+
+  private final Boolean businessCustomerWithoutVatNumber;
+
+  private final Boolean isEinvoiceEnabled;
+
+  private final EinvoicingMethod einvoicingMethod;
+
+  private final BillingAddressParams billingAddress;
+
+  private final List<EntityIdentifiersParams> entityIdentifiers;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerUpdateBillingInfoParams(CustomerUpdateBillingInfoBuilder builder) {
+
+    this.vatNumber = builder.vatNumber;
+
+    this.vatNumberPrefix = builder.vatNumberPrefix;
+
+    this.entityIdentifierScheme = builder.entityIdentifierScheme;
+
+    this.entityIdentifierStandard = builder.entityIdentifierStandard;
+
+    this.registeredForGst = builder.registeredForGst;
+
+    this.businessCustomerWithoutVatNumber = builder.businessCustomerWithoutVatNumber;
+
+    this.isEinvoiceEnabled = builder.isEinvoiceEnabled;
+
+    this.einvoicingMethod = builder.einvoicingMethod;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.entityIdentifiers = builder.entityIdentifiers;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public String getVatNumber() {
+    return vatNumber;
+  }
+
+  public String getVatNumberPrefix() {
+    return vatNumberPrefix;
+  }
+
+  public String getEntityIdentifierScheme() {
+    return entityIdentifierScheme;
+  }
+
+  public String getEntityIdentifierStandard() {
+    return entityIdentifierStandard;
+  }
+
+  public Boolean getRegisteredForGst() {
+    return registeredForGst;
+  }
+
+  public Boolean getBusinessCustomerWithoutVatNumber() {
+    return businessCustomerWithoutVatNumber;
+  }
+
+  public Boolean getIsEinvoiceEnabled() {
+    return isEinvoiceEnabled;
+  }
+
+  public EinvoicingMethod getEinvoicingMethod() {
+    return einvoicingMethod;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public List<EntityIdentifiersParams> getEntityIdentifiers() {
+    return entityIdentifiers;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.vatNumber != null) {
+
+      formData.put("vat_number", this.vatNumber);
+    }
+
+    if (this.vatNumberPrefix != null) {
+
+      formData.put("vat_number_prefix", this.vatNumberPrefix);
+    }
+
+    if (this.entityIdentifierScheme != null) {
+
+      formData.put("entity_identifier_scheme", this.entityIdentifierScheme);
+    }
+
+    if (this.entityIdentifierStandard != null) {
+
+      formData.put("entity_identifier_standard", this.entityIdentifierStandard);
+    }
+
+    if (this.registeredForGst != null) {
+
+      formData.put("registered_for_gst", this.registeredForGst);
+    }
+
+    if (this.businessCustomerWithoutVatNumber != null) {
+
+      formData.put("business_customer_without_vat_number", this.businessCustomerWithoutVatNumber);
+    }
+
+    if (this.isEinvoiceEnabled != null) {
+
+      formData.put("is_einvoice_enabled", this.isEinvoiceEnabled);
+    }
+
+    if (this.einvoicingMethod != null) {
+
+      formData.put("einvoicing_method", this.einvoicingMethod);
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.entityIdentifiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.entityIdentifiers.size(); i++) {
+        EntityIdentifiersParams item = this.entityIdentifiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "entity_identifiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerUpdateBillingInfoParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerUpdateBillingInfoBuilder builder() {
+    return new CustomerUpdateBillingInfoBuilder();
+  }
+
+  public static final class CustomerUpdateBillingInfoBuilder {
+
+    private String vatNumber;
+
+    private String vatNumberPrefix;
+
+    private String entityIdentifierScheme;
+
+    private String entityIdentifierStandard;
+
+    private Boolean registeredForGst;
+
+    private Boolean businessCustomerWithoutVatNumber;
+
+    private Boolean isEinvoiceEnabled;
+
+    private EinvoicingMethod einvoicingMethod;
+
+    private BillingAddressParams billingAddress;
+
+    private List<EntityIdentifiersParams> entityIdentifiers;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerUpdateBillingInfoBuilder() {}
+
+    public CustomerUpdateBillingInfoBuilder vatNumber(String value) {
+      this.vatNumber = value;
+      return this;
+    }
+
+    public CustomerUpdateBillingInfoBuilder vatNumberPrefix(String value) {
+      this.vatNumberPrefix = value;
+      return this;
+    }
+
+    public CustomerUpdateBillingInfoBuilder entityIdentifierScheme(String value) {
+      this.entityIdentifierScheme = value;
+      return this;
+    }
+
+    public CustomerUpdateBillingInfoBuilder entityIdentifierStandard(String value) {
+      this.entityIdentifierStandard = value;
+      return this;
+    }
+
+    public CustomerUpdateBillingInfoBuilder registeredForGst(Boolean value) {
+      this.registeredForGst = value;
+      return this;
+    }
+
+    public CustomerUpdateBillingInfoBuilder businessCustomerWithoutVatNumber(Boolean value) {
+      this.businessCustomerWithoutVatNumber = value;
+      return this;
+    }
+
+    public CustomerUpdateBillingInfoBuilder isEinvoiceEnabled(Boolean value) {
+      this.isEinvoiceEnabled = value;
+      return this;
+    }
+
+    public CustomerUpdateBillingInfoBuilder einvoicingMethod(EinvoicingMethod value) {
+      this.einvoicingMethod = value;
+      return this;
+    }
+
+    public CustomerUpdateBillingInfoBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public CustomerUpdateBillingInfoBuilder entityIdentifiers(List<EntityIdentifiersParams> value) {
+      this.entityIdentifiers = value;
+      return this;
+    }
+
+    public CustomerUpdateBillingInfoBuilder taxProvidersFields(
+        List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerUpdateBillingInfoBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerUpdateBillingInfoBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerUpdateBillingInfoBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerUpdateBillingInfoParams build() {
+      return new CustomerUpdateBillingInfoParams(this);
+    }
+  }
+
+  public enum EinvoicingMethod {
+    AUTOMATIC("automatic"),
+
+    MANUAL("manual"),
+
+    SITE_DEFAULT("site_default"),
+
+    /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    EinvoicingMethod(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static EinvoicingMethod fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class EntityIdentifiersParams {
+
+    private final String id;
+
+    private final String scheme;
+
+    private final String value;
+
+    private final Operation operation;
+
+    private final String standard;
+
+    private EntityIdentifiersParams(EntityIdentifiersBuilder builder) {
+
+      this.id = builder.id;
+
+      this.scheme = builder.scheme;
+
+      this.value = builder.value;
+
+      this.operation = builder.operation;
+
+      this.standard = builder.standard;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getScheme() {
+      return scheme;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public Operation getOperation() {
+      return operation;
+    }
+
+    public String getStandard() {
+      return standard;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.scheme != null) {
+
+        formData.put("scheme", this.scheme);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      if (this.operation != null) {
+
+        formData.put("operation", this.operation);
+      }
+
+      if (this.standard != null) {
+
+        formData.put("standard", this.standard);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EntityIdentifiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EntityIdentifiersBuilder builder() {
+      return new EntityIdentifiersBuilder();
+    }
+
+    public static final class EntityIdentifiersBuilder {
+
+      private String id;
+
+      private String scheme;
+
+      private String value;
+
+      private Operation operation;
+
+      private String standard;
+
+      private EntityIdentifiersBuilder() {}
+
+      public EntityIdentifiersBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder scheme(String value) {
+        this.scheme = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder operation(Operation value) {
+        this.operation = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder standard(String value) {
+        this.standard = value;
+        return this;
+      }
+
+      public EntityIdentifiersParams build() {
+        return new EntityIdentifiersParams(this);
+      }
+    }
+
+    public enum Operation {
+      CREATE("create"),
+
+      UPDATE("update"),
+
+      DELETE("delete"),
+
+      /** An enum member indicating that Operation was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Operation(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Operation fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Operation enumValue : Operation.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdateContactParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdateContactParams.java
new file mode 100644
index 00000000..ae017960
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdateContactParams.java
@@ -0,0 +1,342 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerUpdateContactParams {
+
+  private final ContactParams contact;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerUpdateContactParams(CustomerUpdateContactBuilder builder) {
+
+    this.contact = builder.contact;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public ContactParams getContact() {
+    return contact;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.contact != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contact.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contact[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerUpdateContactParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerUpdateContactBuilder builder() {
+    return new CustomerUpdateContactBuilder();
+  }
+
+  public static final class CustomerUpdateContactBuilder {
+
+    private ContactParams contact;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerUpdateContactBuilder() {}
+
+    public CustomerUpdateContactBuilder contact(ContactParams value) {
+      this.contact = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerUpdateContactBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerUpdateContactBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerUpdateContactBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerUpdateContactParams build() {
+      return new CustomerUpdateContactParams(this);
+    }
+  }
+
+  public static final class ContactParams {
+
+    private final String id;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String phone;
+
+    private final String label;
+
+    private final Boolean enabled;
+
+    private final Boolean sendBillingEmail;
+
+    private final Boolean sendAccountEmail;
+
+    private ContactParams(ContactBuilder builder) {
+
+      this.id = builder.id;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.phone = builder.phone;
+
+      this.label = builder.label;
+
+      this.enabled = builder.enabled;
+
+      this.sendBillingEmail = builder.sendBillingEmail;
+
+      this.sendAccountEmail = builder.sendAccountEmail;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLabel() {
+      return label;
+    }
+
+    public Boolean getEnabled() {
+      return enabled;
+    }
+
+    public Boolean getSendBillingEmail() {
+      return sendBillingEmail;
+    }
+
+    public Boolean getSendAccountEmail() {
+      return sendAccountEmail;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.label != null) {
+
+        formData.put("label", this.label);
+      }
+
+      if (this.enabled != null) {
+
+        formData.put("enabled", this.enabled);
+      }
+
+      if (this.sendBillingEmail != null) {
+
+        formData.put("send_billing_email", this.sendBillingEmail);
+      }
+
+      if (this.sendAccountEmail != null) {
+
+        formData.put("send_account_email", this.sendAccountEmail);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContactParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContactBuilder builder() {
+      return new ContactBuilder();
+    }
+
+    public static final class ContactBuilder {
+
+      private String id;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String phone;
+
+      private String label;
+
+      private Boolean enabled;
+
+      private Boolean sendBillingEmail;
+
+      private Boolean sendAccountEmail;
+
+      private ContactBuilder() {}
+
+      public ContactBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public ContactBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ContactBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ContactBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ContactBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ContactBuilder label(String value) {
+        this.label = value;
+        return this;
+      }
+
+      public ContactBuilder enabled(Boolean value) {
+        this.enabled = value;
+        return this;
+      }
+
+      public ContactBuilder sendBillingEmail(Boolean value) {
+        this.sendBillingEmail = value;
+        return this;
+      }
+
+      public ContactBuilder sendAccountEmail(Boolean value) {
+        this.sendAccountEmail = value;
+        return this;
+      }
+
+      public ContactParams build() {
+        return new ContactParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdateHierarchySettingsParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdateHierarchySettingsParams.java
new file mode 100644
index 00000000..44e42919
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdateHierarchySettingsParams.java
@@ -0,0 +1,569 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerUpdateHierarchySettingsParams {
+
+  private final Boolean useDefaultHierarchySettings;
+
+  private final ParentAccountAccessParams parentAccountAccess;
+
+  private final ChildAccountAccessParams childAccountAccess;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerUpdateHierarchySettingsParams(CustomerUpdateHierarchySettingsBuilder builder) {
+
+    this.useDefaultHierarchySettings = builder.useDefaultHierarchySettings;
+
+    this.parentAccountAccess = builder.parentAccountAccess;
+
+    this.childAccountAccess = builder.childAccountAccess;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public Boolean getUseDefaultHierarchySettings() {
+    return useDefaultHierarchySettings;
+  }
+
+  public ParentAccountAccessParams getParentAccountAccess() {
+    return parentAccountAccess;
+  }
+
+  public ChildAccountAccessParams getChildAccountAccess() {
+    return childAccountAccess;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.useDefaultHierarchySettings != null) {
+
+      formData.put("use_default_hierarchy_settings", this.useDefaultHierarchySettings);
+    }
+
+    if (this.parentAccountAccess != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.parentAccountAccess.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "parent_account_access[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.childAccountAccess != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.childAccountAccess.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "child_account_access[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerUpdateHierarchySettingsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerUpdateHierarchySettingsBuilder builder() {
+    return new CustomerUpdateHierarchySettingsBuilder();
+  }
+
+  public static final class CustomerUpdateHierarchySettingsBuilder {
+
+    private Boolean useDefaultHierarchySettings;
+
+    private ParentAccountAccessParams parentAccountAccess;
+
+    private ChildAccountAccessParams childAccountAccess;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerUpdateHierarchySettingsBuilder() {}
+
+    public CustomerUpdateHierarchySettingsBuilder useDefaultHierarchySettings(Boolean value) {
+      this.useDefaultHierarchySettings = value;
+      return this;
+    }
+
+    public CustomerUpdateHierarchySettingsBuilder parentAccountAccess(
+        ParentAccountAccessParams value) {
+      this.parentAccountAccess = value;
+      return this;
+    }
+
+    public CustomerUpdateHierarchySettingsBuilder childAccountAccess(
+        ChildAccountAccessParams value) {
+      this.childAccountAccess = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerUpdateHierarchySettingsBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerUpdateHierarchySettingsBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerUpdateHierarchySettingsBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerUpdateHierarchySettingsParams build() {
+      return new CustomerUpdateHierarchySettingsParams(this);
+    }
+  }
+
+  public static final class ParentAccountAccessParams {
+
+    private final PortalEditChildSubscriptions portalEditChildSubscriptions;
+
+    private final PortalDownloadChildInvoices portalDownloadChildInvoices;
+
+    private final Boolean sendSubscriptionEmails;
+
+    private final Boolean sendPaymentEmails;
+
+    private final Boolean sendInvoiceEmails;
+
+    private ParentAccountAccessParams(ParentAccountAccessBuilder builder) {
+
+      this.portalEditChildSubscriptions = builder.portalEditChildSubscriptions;
+
+      this.portalDownloadChildInvoices = builder.portalDownloadChildInvoices;
+
+      this.sendSubscriptionEmails = builder.sendSubscriptionEmails;
+
+      this.sendPaymentEmails = builder.sendPaymentEmails;
+
+      this.sendInvoiceEmails = builder.sendInvoiceEmails;
+    }
+
+    public PortalEditChildSubscriptions getPortalEditChildSubscriptions() {
+      return portalEditChildSubscriptions;
+    }
+
+    public PortalDownloadChildInvoices getPortalDownloadChildInvoices() {
+      return portalDownloadChildInvoices;
+    }
+
+    public Boolean getSendSubscriptionEmails() {
+      return sendSubscriptionEmails;
+    }
+
+    public Boolean getSendPaymentEmails() {
+      return sendPaymentEmails;
+    }
+
+    public Boolean getSendInvoiceEmails() {
+      return sendInvoiceEmails;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.portalEditChildSubscriptions != null) {
+
+        formData.put("portal_edit_child_subscriptions", this.portalEditChildSubscriptions);
+      }
+
+      if (this.portalDownloadChildInvoices != null) {
+
+        formData.put("portal_download_child_invoices", this.portalDownloadChildInvoices);
+      }
+
+      if (this.sendSubscriptionEmails != null) {
+
+        formData.put("send_subscription_emails", this.sendSubscriptionEmails);
+      }
+
+      if (this.sendPaymentEmails != null) {
+
+        formData.put("send_payment_emails", this.sendPaymentEmails);
+      }
+
+      if (this.sendInvoiceEmails != null) {
+
+        formData.put("send_invoice_emails", this.sendInvoiceEmails);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ParentAccountAccessParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ParentAccountAccessBuilder builder() {
+      return new ParentAccountAccessBuilder();
+    }
+
+    public static final class ParentAccountAccessBuilder {
+
+      private PortalEditChildSubscriptions portalEditChildSubscriptions;
+
+      private PortalDownloadChildInvoices portalDownloadChildInvoices;
+
+      private Boolean sendSubscriptionEmails;
+
+      private Boolean sendPaymentEmails;
+
+      private Boolean sendInvoiceEmails;
+
+      private ParentAccountAccessBuilder() {}
+
+      public ParentAccountAccessBuilder portalEditChildSubscriptions(
+          PortalEditChildSubscriptions value) {
+        this.portalEditChildSubscriptions = value;
+        return this;
+      }
+
+      public ParentAccountAccessBuilder portalDownloadChildInvoices(
+          PortalDownloadChildInvoices value) {
+        this.portalDownloadChildInvoices = value;
+        return this;
+      }
+
+      public ParentAccountAccessBuilder sendSubscriptionEmails(Boolean value) {
+        this.sendSubscriptionEmails = value;
+        return this;
+      }
+
+      public ParentAccountAccessBuilder sendPaymentEmails(Boolean value) {
+        this.sendPaymentEmails = value;
+        return this;
+      }
+
+      public ParentAccountAccessBuilder sendInvoiceEmails(Boolean value) {
+        this.sendInvoiceEmails = value;
+        return this;
+      }
+
+      public ParentAccountAccessParams build() {
+        return new ParentAccountAccessParams(this);
+      }
+    }
+
+    public enum PortalEditChildSubscriptions {
+      YES("yes"),
+
+      VIEW_ONLY("view_only"),
+
+      NO("no"),
+
+      /**
+       * An enum member indicating that PortalEditChildSubscriptions was instantiated with an
+       * unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PortalEditChildSubscriptions(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PortalEditChildSubscriptions fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PortalEditChildSubscriptions enumValue : PortalEditChildSubscriptions.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PortalDownloadChildInvoices {
+      YES("yes"),
+
+      VIEW_ONLY("view_only"),
+
+      NO("no"),
+
+      /**
+       * An enum member indicating that PortalDownloadChildInvoices was instantiated with an unknown
+       * value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PortalDownloadChildInvoices(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PortalDownloadChildInvoices fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PortalDownloadChildInvoices enumValue : PortalDownloadChildInvoices.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChildAccountAccessParams {
+
+    private final PortalEditSubscriptions portalEditSubscriptions;
+
+    private final PortalDownloadInvoices portalDownloadInvoices;
+
+    private final Boolean sendSubscriptionEmails;
+
+    private final Boolean sendPaymentEmails;
+
+    private final Boolean sendInvoiceEmails;
+
+    private ChildAccountAccessParams(ChildAccountAccessBuilder builder) {
+
+      this.portalEditSubscriptions = builder.portalEditSubscriptions;
+
+      this.portalDownloadInvoices = builder.portalDownloadInvoices;
+
+      this.sendSubscriptionEmails = builder.sendSubscriptionEmails;
+
+      this.sendPaymentEmails = builder.sendPaymentEmails;
+
+      this.sendInvoiceEmails = builder.sendInvoiceEmails;
+    }
+
+    public PortalEditSubscriptions getPortalEditSubscriptions() {
+      return portalEditSubscriptions;
+    }
+
+    public PortalDownloadInvoices getPortalDownloadInvoices() {
+      return portalDownloadInvoices;
+    }
+
+    public Boolean getSendSubscriptionEmails() {
+      return sendSubscriptionEmails;
+    }
+
+    public Boolean getSendPaymentEmails() {
+      return sendPaymentEmails;
+    }
+
+    public Boolean getSendInvoiceEmails() {
+      return sendInvoiceEmails;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.portalEditSubscriptions != null) {
+
+        formData.put("portal_edit_subscriptions", this.portalEditSubscriptions);
+      }
+
+      if (this.portalDownloadInvoices != null) {
+
+        formData.put("portal_download_invoices", this.portalDownloadInvoices);
+      }
+
+      if (this.sendSubscriptionEmails != null) {
+
+        formData.put("send_subscription_emails", this.sendSubscriptionEmails);
+      }
+
+      if (this.sendPaymentEmails != null) {
+
+        formData.put("send_payment_emails", this.sendPaymentEmails);
+      }
+
+      if (this.sendInvoiceEmails != null) {
+
+        formData.put("send_invoice_emails", this.sendInvoiceEmails);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChildAccountAccessParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChildAccountAccessBuilder builder() {
+      return new ChildAccountAccessBuilder();
+    }
+
+    public static final class ChildAccountAccessBuilder {
+
+      private PortalEditSubscriptions portalEditSubscriptions;
+
+      private PortalDownloadInvoices portalDownloadInvoices;
+
+      private Boolean sendSubscriptionEmails;
+
+      private Boolean sendPaymentEmails;
+
+      private Boolean sendInvoiceEmails;
+
+      private ChildAccountAccessBuilder() {}
+
+      public ChildAccountAccessBuilder portalEditSubscriptions(PortalEditSubscriptions value) {
+        this.portalEditSubscriptions = value;
+        return this;
+      }
+
+      public ChildAccountAccessBuilder portalDownloadInvoices(PortalDownloadInvoices value) {
+        this.portalDownloadInvoices = value;
+        return this;
+      }
+
+      public ChildAccountAccessBuilder sendSubscriptionEmails(Boolean value) {
+        this.sendSubscriptionEmails = value;
+        return this;
+      }
+
+      public ChildAccountAccessBuilder sendPaymentEmails(Boolean value) {
+        this.sendPaymentEmails = value;
+        return this;
+      }
+
+      public ChildAccountAccessBuilder sendInvoiceEmails(Boolean value) {
+        this.sendInvoiceEmails = value;
+        return this;
+      }
+
+      public ChildAccountAccessParams build() {
+        return new ChildAccountAccessParams(this);
+      }
+    }
+
+    public enum PortalEditSubscriptions {
+      YES("yes"),
+
+      VIEW_ONLY("view_only"),
+
+      /**
+       * An enum member indicating that PortalEditSubscriptions was instantiated with an unknown
+       * value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PortalEditSubscriptions(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PortalEditSubscriptions fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PortalEditSubscriptions enumValue : PortalEditSubscriptions.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PortalDownloadInvoices {
+      YES("yes"),
+
+      VIEW_ONLY("view_only"),
+
+      NO("no"),
+
+      /**
+       * An enum member indicating that PortalDownloadInvoices was instantiated with an unknown
+       * value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PortalDownloadInvoices(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PortalDownloadInvoices fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PortalDownloadInvoices enumValue : PortalDownloadInvoices.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdateParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdateParams.java
new file mode 100644
index 00000000..31483a64
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdateParams.java
@@ -0,0 +1,1003 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class CustomerUpdateParams {
+
+  private final String firstName;
+
+  private final String lastName;
+
+  private final String email;
+
+  private final String preferredCurrencyCode;
+
+  private final String phone;
+
+  private final String company;
+
+  private final AutoCollection autoCollection;
+
+  private final Boolean allowDirectDebit;
+
+  private final Integer netTermDays;
+
+  private final Taxability taxability;
+
+  private final List<Object> exemptionDetails;
+
+  private final CustomerType customerType;
+
+  private final String clientProfileId;
+
+  private final TaxjarExemptionCategory taxjarExemptionCategory;
+
+  private final String locale;
+
+  private final EntityCode entityCode;
+
+  private final String exemptNumber;
+
+  private final OfflinePaymentMethod offlinePaymentMethod;
+
+  private final String invoiceNotes;
+
+  private final Boolean autoCloseInvoices;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final FraudFlag fraudFlag;
+
+  private final Boolean consolidatedInvoicing;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private final Map<String, String> customFields;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerUpdateParams(CustomerUpdateBuilder builder) {
+
+    this.firstName = builder.firstName;
+
+    this.lastName = builder.lastName;
+
+    this.email = builder.email;
+
+    this.preferredCurrencyCode = builder.preferredCurrencyCode;
+
+    this.phone = builder.phone;
+
+    this.company = builder.company;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.allowDirectDebit = builder.allowDirectDebit;
+
+    this.netTermDays = builder.netTermDays;
+
+    this.taxability = builder.taxability;
+
+    this.exemptionDetails = builder.exemptionDetails;
+
+    this.customerType = builder.customerType;
+
+    this.clientProfileId = builder.clientProfileId;
+
+    this.taxjarExemptionCategory = builder.taxjarExemptionCategory;
+
+    this.locale = builder.locale;
+
+    this.entityCode = builder.entityCode;
+
+    this.exemptNumber = builder.exemptNumber;
+
+    this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.autoCloseInvoices = builder.autoCloseInvoices;
+
+    this.metaData = builder.metaData;
+
+    this.fraudFlag = builder.fraudFlag;
+
+    this.consolidatedInvoicing = builder.consolidatedInvoicing;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public String getFirstName() {
+    return firstName;
+  }
+
+  public String getLastName() {
+    return lastName;
+  }
+
+  public String getEmail() {
+    return email;
+  }
+
+  public String getPreferredCurrencyCode() {
+    return preferredCurrencyCode;
+  }
+
+  public String getPhone() {
+    return phone;
+  }
+
+  public String getCompany() {
+    return company;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public Boolean getAllowDirectDebit() {
+    return allowDirectDebit;
+  }
+
+  public Integer getNetTermDays() {
+    return netTermDays;
+  }
+
+  public Taxability getTaxability() {
+    return taxability;
+  }
+
+  public List<Object> getExemptionDetails() {
+    return exemptionDetails;
+  }
+
+  public CustomerType getCustomerType() {
+    return customerType;
+  }
+
+  public String getClientProfileId() {
+    return clientProfileId;
+  }
+
+  public TaxjarExemptionCategory getTaxjarExemptionCategory() {
+    return taxjarExemptionCategory;
+  }
+
+  public String getLocale() {
+    return locale;
+  }
+
+  public EntityCode getEntityCode() {
+    return entityCode;
+  }
+
+  public String getExemptNumber() {
+    return exemptNumber;
+  }
+
+  public OfflinePaymentMethod getOfflinePaymentMethod() {
+    return offlinePaymentMethod;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public Boolean getAutoCloseInvoices() {
+    return autoCloseInvoices;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public FraudFlag getFraudFlag() {
+    return fraudFlag;
+  }
+
+  public Boolean getConsolidatedInvoicing() {
+    return consolidatedInvoicing;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.firstName != null) {
+
+      formData.put("first_name", this.firstName);
+    }
+
+    if (this.lastName != null) {
+
+      formData.put("last_name", this.lastName);
+    }
+
+    if (this.email != null) {
+
+      formData.put("email", this.email);
+    }
+
+    if (this.preferredCurrencyCode != null) {
+
+      formData.put("preferred_currency_code", this.preferredCurrencyCode);
+    }
+
+    if (this.phone != null) {
+
+      formData.put("phone", this.phone);
+    }
+
+    if (this.company != null) {
+
+      formData.put("company", this.company);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.allowDirectDebit != null) {
+
+      formData.put("allow_direct_debit", this.allowDirectDebit);
+    }
+
+    if (this.netTermDays != null) {
+
+      formData.put("net_term_days", this.netTermDays);
+    }
+
+    if (this.taxability != null) {
+
+      formData.put("taxability", this.taxability);
+    }
+
+    if (this.exemptionDetails != null) {
+
+      formData.put("exemption_details", JsonUtil.toJson(this.exemptionDetails));
+    }
+
+    if (this.customerType != null) {
+
+      formData.put("customer_type", this.customerType);
+    }
+
+    if (this.clientProfileId != null) {
+
+      formData.put("client_profile_id", this.clientProfileId);
+    }
+
+    if (this.taxjarExemptionCategory != null) {
+
+      formData.put("taxjar_exemption_category", this.taxjarExemptionCategory);
+    }
+
+    if (this.locale != null) {
+
+      formData.put("locale", this.locale);
+    }
+
+    if (this.entityCode != null) {
+
+      formData.put("entity_code", this.entityCode);
+    }
+
+    if (this.exemptNumber != null) {
+
+      formData.put("exempt_number", this.exemptNumber);
+    }
+
+    if (this.offlinePaymentMethod != null) {
+
+      formData.put("offline_payment_method", this.offlinePaymentMethod);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.autoCloseInvoices != null) {
+
+      formData.put("auto_close_invoices", this.autoCloseInvoices);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.fraudFlag != null) {
+
+      formData.put("fraud_flag", this.fraudFlag);
+    }
+
+    if (this.consolidatedInvoicing != null) {
+
+      formData.put("consolidated_invoicing", this.consolidatedInvoicing);
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerUpdateBuilder builder() {
+    return new CustomerUpdateBuilder();
+  }
+
+  public static final class CustomerUpdateBuilder {
+
+    private String firstName;
+
+    private String lastName;
+
+    private String email;
+
+    private String preferredCurrencyCode;
+
+    private String phone;
+
+    private String company;
+
+    private AutoCollection autoCollection;
+
+    private Boolean allowDirectDebit;
+
+    private Integer netTermDays;
+
+    private Taxability taxability;
+
+    private List<Object> exemptionDetails;
+
+    private CustomerType customerType;
+
+    private String clientProfileId;
+
+    private TaxjarExemptionCategory taxjarExemptionCategory;
+
+    private String locale;
+
+    private EntityCode entityCode;
+
+    private String exemptNumber;
+
+    private OfflinePaymentMethod offlinePaymentMethod;
+
+    private String invoiceNotes;
+
+    private Boolean autoCloseInvoices;
+
+    private java.util.Map<String, Object> metaData;
+
+    private FraudFlag fraudFlag;
+
+    private Boolean consolidatedInvoicing;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerUpdateBuilder() {}
+
+    public CustomerUpdateBuilder firstName(String value) {
+      this.firstName = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder lastName(String value) {
+      this.lastName = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder email(String value) {
+      this.email = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder preferredCurrencyCode(String value) {
+      this.preferredCurrencyCode = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder phone(String value) {
+      this.phone = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder company(String value) {
+      this.company = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder allowDirectDebit(Boolean value) {
+      this.allowDirectDebit = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder netTermDays(Integer value) {
+      this.netTermDays = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder taxability(Taxability value) {
+      this.taxability = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder exemptionDetails(List<Object> value) {
+      this.exemptionDetails = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder customerType(CustomerType value) {
+      this.customerType = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder clientProfileId(String value) {
+      this.clientProfileId = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder taxjarExemptionCategory(TaxjarExemptionCategory value) {
+      this.taxjarExemptionCategory = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder locale(String value) {
+      this.locale = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder entityCode(EntityCode value) {
+      this.entityCode = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder exemptNumber(String value) {
+      this.exemptNumber = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+      this.offlinePaymentMethod = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder autoCloseInvoices(Boolean value) {
+      this.autoCloseInvoices = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder fraudFlag(FraudFlag value) {
+      this.fraudFlag = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder consolidatedInvoicing(Boolean value) {
+      this.consolidatedInvoicing = value;
+      return this;
+    }
+
+    public CustomerUpdateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public CustomerUpdateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public CustomerUpdateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerUpdateBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerUpdateBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerUpdateBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerUpdateParams build() {
+      return new CustomerUpdateParams(this);
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Taxability {
+    TAXABLE("taxable"),
+
+    EXEMPT("exempt"),
+
+    /** An enum member indicating that Taxability was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Taxability(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Taxability fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Taxability enumValue : Taxability.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum CustomerType {
+    RESIDENTIAL("residential"),
+
+    BUSINESS("business"),
+
+    SENIOR_CITIZEN("senior_citizen"),
+
+    INDUSTRIAL("industrial"),
+
+    /** An enum member indicating that CustomerType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CustomerType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CustomerType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CustomerType enumValue : CustomerType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TaxjarExemptionCategory {
+    WHOLESALE("wholesale"),
+
+    GOVERNMENT("government"),
+
+    OTHER("other"),
+
+    /**
+     * An enum member indicating that TaxjarExemptionCategory was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    TaxjarExemptionCategory(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TaxjarExemptionCategory fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TaxjarExemptionCategory enumValue : TaxjarExemptionCategory.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum EntityCode {
+    A("a"),
+
+    B("b"),
+
+    C("c"),
+
+    D("d"),
+
+    E("e"),
+
+    F("f"),
+
+    G("g"),
+
+    H("h"),
+
+    I("i"),
+
+    J("j"),
+
+    K("k"),
+
+    L("l"),
+
+    M("m"),
+
+    N("n"),
+
+    P("p"),
+
+    Q("q"),
+
+    R("r"),
+
+    MED_1("med1"),
+
+    MED_2("med2"),
+
+    /** An enum member indicating that EntityCode was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    EntityCode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static EntityCode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (EntityCode enumValue : EntityCode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum OfflinePaymentMethod {
+    NO_PREFERENCE("no_preference"),
+
+    CASH("cash"),
+
+    CHECK("check"),
+
+    BANK_TRANSFER("bank_transfer"),
+
+    ACH_CREDIT("ach_credit"),
+
+    SEPA_CREDIT("sepa_credit"),
+
+    BOLETO("boleto"),
+
+    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+    CUSTOM("custom"),
+
+    /**
+     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    OfflinePaymentMethod(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static OfflinePaymentMethod fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum FraudFlag {
+    SAFE("safe"),
+
+    FRAUDULENT("fraudulent"),
+
+    /** An enum member indicating that FraudFlag was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    FraudFlag(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static FraudFlag fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (FraudFlag enumValue : FraudFlag.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdatePaymentMethodParams.java b/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdatePaymentMethodParams.java
new file mode 100644
index 00000000..395abe22
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/params/CustomerUpdatePaymentMethodParams.java
@@ -0,0 +1,520 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.customer.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CustomerUpdatePaymentMethodParams {
+
+  private final PaymentMethodParams paymentMethod;
+
+  private final Map<String, Object> consentFields;
+
+  private CustomerUpdatePaymentMethodParams(CustomerUpdatePaymentMethodBuilder builder) {
+
+    this.paymentMethod = builder.paymentMethod;
+
+    this.consentFields =
+        builder.consentFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.consentFields));
+  }
+
+  public PaymentMethodParams getPaymentMethod() {
+    return paymentMethod;
+  }
+
+  public Map<String, Object> consentFields() {
+    return consentFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.paymentMethod != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentMethod.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_method[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    formData.putAll(consentFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CustomerUpdatePaymentMethodParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CustomerUpdatePaymentMethodBuilder builder() {
+    return new CustomerUpdatePaymentMethodBuilder();
+  }
+
+  public static final class CustomerUpdatePaymentMethodBuilder {
+
+    private PaymentMethodParams paymentMethod;
+
+    private Map<String, Object> consentFields = new LinkedHashMap<>();
+
+    private CustomerUpdatePaymentMethodBuilder() {}
+
+    public CustomerUpdatePaymentMethodBuilder paymentMethod(PaymentMethodParams value) {
+      this.paymentMethod = value;
+      return this;
+    }
+
+    /**
+     * Add a consent field to the request. Consent fields must start with "cs_". Consent fields
+     * typically hold boolean values or options.
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the value of the consent field (typically Boolean or String for options)
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerUpdatePaymentMethodBuilder consentField(String fieldName, Object value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add a boolean consent field to the request. Consent fields must start with "cs_".
+     *
+     * @param fieldName the name of the consent field (e.g., "cs_marketing_consent")
+     * @param value the boolean value of the consent field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cs_"
+     */
+    public CustomerUpdatePaymentMethodBuilder consentField(String fieldName, Boolean value) {
+      if (fieldName == null || !fieldName.startsWith("cs_")) {
+        throw new IllegalArgumentException("Consent field name must start with 'cs_'");
+      }
+      this.consentFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple consent fields to the request. All field names must start with "cs_".
+     *
+     * @param consentFields map of consent field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cs_"
+     */
+    public CustomerUpdatePaymentMethodBuilder consentFields(Map<String, Object> consentFields) {
+      if (consentFields != null) {
+        for (Map.Entry<String, Object> entry : consentFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cs_")) {
+            throw new IllegalArgumentException(
+                "Consent field name must start with 'cs_': " + entry.getKey());
+          }
+          this.consentFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CustomerUpdatePaymentMethodParams build() {
+      return new CustomerUpdatePaymentMethodParams(this);
+    }
+  }
+
+  public static final class PaymentMethodParams {
+
+    private final Type type;
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String referenceId;
+
+    private final String tmpToken;
+
+    private final String issuingCountry;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentMethodParams(PaymentMethodBuilder builder) {
+
+      this.type = builder.type;
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.referenceId = builder.referenceId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.issuingCountry = builder.issuingCountry;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getIssuingCountry() {
+      return issuingCountry;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.issuingCountry != null) {
+
+        formData.put("issuing_country", this.issuingCountry);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentMethodBuilder builder() {
+      return new PaymentMethodBuilder();
+    }
+
+    public static final class PaymentMethodBuilder {
+
+      private Type type;
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String referenceId;
+
+      private String tmpToken;
+
+      private String issuingCountry;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentMethodBuilder() {}
+
+      public PaymentMethodBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentMethodBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder issuingCountry(String value) {
+        this.issuingCountry = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentMethodParams build() {
+        return new PaymentMethodParams(this);
+      }
+    }
+
+    public enum Type {
+      CARD("card"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      GENERIC("generic"),
+
+      ALIPAY("alipay"),
+
+      UNIONPAY("unionpay"),
+
+      WECHAT_PAY("wechat_pay"),
+
+      IDEAL("ideal"),
+
+      GOOGLE_PAY("google_pay"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GIROPAY("giropay"),
+
+      DOTPAY("dotpay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      VENMO("venmo"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      GOCARDLESS("gocardless"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/customer/responses/ContactsForCustomerResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/ContactsForCustomerResponse.java
new file mode 100644
index 00000000..f0d282f4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/ContactsForCustomerResponse.java
@@ -0,0 +1,172 @@
+package com.chargebee.v4.models.customer.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.contact.Contact;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.CustomerService;
+import com.chargebee.v4.models.customer.params.ContactsForCustomerParams;
+
+/** Immutable response object for ContactsForCustomer operation. Contains paginated list data. */
+public final class ContactsForCustomerResponse {
+
+  private final List<CustomerContactsForCustomerItem> list;
+
+  private final String nextOffset;
+
+  private final String customerId;
+
+  private final CustomerService service;
+  private final ContactsForCustomerParams originalParams;
+  private final Response httpResponse;
+
+  private ContactsForCustomerResponse(
+      List<CustomerContactsForCustomerItem> list,
+      String nextOffset,
+      String customerId,
+      CustomerService service,
+      ContactsForCustomerParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.customerId = customerId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into ContactsForCustomerResponse object (no service context). Use this when
+   * you only need to read a single page (no nextPage()).
+   */
+  public static ContactsForCustomerResponse fromJson(String json) {
+    try {
+
+      List<CustomerContactsForCustomerItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(CustomerContactsForCustomerItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new ContactsForCustomerResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ContactsForCustomerResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into ContactsForCustomerResponse object with service context for pagination
+   * (enables nextPage()).
+   */
+  public static ContactsForCustomerResponse fromJson(
+      String json,
+      CustomerService service,
+      ContactsForCustomerParams originalParams,
+      String customerId,
+      Response httpResponse) {
+    try {
+
+      List<CustomerContactsForCustomerItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(CustomerContactsForCustomerItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new ContactsForCustomerResponse(
+          list, nextOffset, customerId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ContactsForCustomerResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<CustomerContactsForCustomerItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public ContactsForCustomerResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    ContactsForCustomerParams nextParams =
+        (originalParams != null ? originalParams.toBuilder() : ContactsForCustomerParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.contactsForCustomer(customerId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class CustomerContactsForCustomerItem {
+
+    private Contact contact;
+
+    public Contact getContact() {
+      return contact;
+    }
+
+    public static CustomerContactsForCustomerItem fromJson(String json) {
+      CustomerContactsForCustomerItem item = new CustomerContactsForCustomerItem();
+
+      String __contactJson = JsonUtil.getObject(json, "contact");
+      if (__contactJson != null) {
+        item.contact = Contact.fromJson(__contactJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerAddContactResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerAddContactResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerAddContactResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerAddContactResponse.java
index 6dd30ec8..2c13b611 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerAddContactResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerAddContactResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerAddPromotionalCreditsResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerAddPromotionalCreditsResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerAddPromotionalCreditsResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerAddPromotionalCreditsResponse.java
index ec31edb6..ab762ae4 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerAddPromotionalCreditsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerAddPromotionalCreditsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerAssignPaymentRoleResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerAssignPaymentRoleResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerAssignPaymentRoleResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerAssignPaymentRoleResponse.java
index dec53fc4..63b50568 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerAssignPaymentRoleResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerAssignPaymentRoleResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerChangeBillingDateResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerChangeBillingDateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerChangeBillingDateResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerChangeBillingDateResponse.java
index d8934704..6460c434 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerChangeBillingDateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerChangeBillingDateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerClearPersonalDataResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerClearPersonalDataResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerClearPersonalDataResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerClearPersonalDataResponse.java
index 9a3619b6..47a928b5 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerClearPersonalDataResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerClearPersonalDataResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerCollectPaymentResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerCollectPaymentResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerCollectPaymentResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerCollectPaymentResponse.java
index 2f6264c1..5fa81417 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerCollectPaymentResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerCollectPaymentResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerCreateResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerCreateResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerCreateResponse.java
index aa862d24..f83d9706 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerCreateResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerDeductPromotionalCreditsResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerDeductPromotionalCreditsResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerDeductPromotionalCreditsResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerDeductPromotionalCreditsResponse.java
index f27274ac..1ef3e629 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerDeductPromotionalCreditsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerDeductPromotionalCreditsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerDeleteContactResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerDeleteContactResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerDeleteContactResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerDeleteContactResponse.java
index 5414b807..a2583241 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerDeleteContactResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerDeleteContactResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerDeleteRelationshipResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerDeleteRelationshipResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerDeleteRelationshipResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerDeleteRelationshipResponse.java
index f118b680..7ad797b6 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerDeleteRelationshipResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerDeleteRelationshipResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerDeleteResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerDeleteResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerDeleteResponse.java
index 0139b521..f46369d7 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerDeleteResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/customer/responses/CustomerHierarchyResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerHierarchyResponse.java
new file mode 100644
index 00000000..ff9a6d5e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerHierarchyResponse.java
@@ -0,0 +1,81 @@
+package com.chargebee.v4.models.customer.responses;
+
+import com.chargebee.v4.models.hierarchy.Hierarchy;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import java.util.List;
+
+/**
+ * Immutable response object for CustomerHierarchy operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class CustomerHierarchyResponse extends BaseResponse {
+  private final List<Hierarchy> hierarchies;
+
+  private CustomerHierarchyResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.hierarchies = builder.hierarchies;
+  }
+
+  /** Parse JSON response into CustomerHierarchyResponse object. */
+  public static CustomerHierarchyResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CustomerHierarchyResponse object with HTTP response. */
+  public static CustomerHierarchyResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __hierarchiesJson = JsonUtil.getArray(json, "hierarchies");
+      if (__hierarchiesJson != null) {
+        builder.hierarchies(
+            JsonUtil.parseObjectArray(__hierarchiesJson).stream()
+                .map(Hierarchy::fromJson)
+                .collect(java.util.stream.Collectors.toList()));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CustomerHierarchyResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CustomerHierarchyResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CustomerHierarchyResponse. */
+  public static class Builder {
+
+    private List<Hierarchy> hierarchies;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder hierarchies(List<Hierarchy> hierarchies) {
+      this.hierarchies = hierarchies;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CustomerHierarchyResponse build() {
+      return new CustomerHierarchyResponse(this);
+    }
+  }
+
+  /** Get the hierarchies from the response. */
+  public List<Hierarchy> getHierarchies() {
+    return hierarchies;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerListHierarchyDetailResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerListHierarchyDetailResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerListHierarchyDetailResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerListHierarchyDetailResponse.java
index ebec7917..1f953bc8 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerListHierarchyDetailResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerListHierarchyDetailResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.hierarchy.Hierarchy;
+import com.chargebee.v4.models.hierarchy.Hierarchy;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.CustomerService;
-import com.chargebee.v4.core.models.customer.params.CustomerListHierarchyDetailParams;
+import com.chargebee.v4.services.CustomerService;
+import com.chargebee.v4.models.customer.params.CustomerListHierarchyDetailParams;
 
 /**
  * Immutable response object for CustomerListHierarchyDetail operation. Contains paginated list
@@ -110,9 +111,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public CustomerListHierarchyDetailResponse nextPage() throws Exception {
+  public CustomerListHierarchyDetailResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerListResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerListResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerListResponse.java
index 03554a20..69293dff 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerListResponse.java
@@ -1,15 +1,16 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.CustomerService;
-import com.chargebee.v4.core.models.customer.params.CustomerListParams;
+import com.chargebee.v4.services.CustomerService;
+import com.chargebee.v4.models.customer.params.CustomerListParams;
 
 /** Immutable response object for CustomerList operation. Contains paginated list data. */
 public final class CustomerListResponse {
@@ -100,9 +101,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public CustomerListResponse nextPage() throws Exception {
+  public CustomerListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerMergeResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerMergeResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerMergeResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerMergeResponse.java
index 404517bf..9690619b 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerMergeResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerMergeResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerMoveResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerMoveResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerMoveResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerMoveResponse.java
index 38744187..05c81d87 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerMoveResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerMoveResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.resourceMigration.ResourceMigration;
+import com.chargebee.v4.models.resourceMigration.ResourceMigration;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerRecordExcessPaymentResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerRecordExcessPaymentResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerRecordExcessPaymentResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerRecordExcessPaymentResponse.java
index 2278f32d..9f291599 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerRecordExcessPaymentResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerRecordExcessPaymentResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerRelationshipsResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerRelationshipsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerRelationshipsResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerRelationshipsResponse.java
index bc33895f..d8b8bf2f 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerRelationshipsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerRelationshipsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/customer/responses/CustomerRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerRetrieveResponse.java
new file mode 100644
index 00000000..20753097
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerRetrieveResponse.java
@@ -0,0 +1,100 @@
+package com.chargebee.v4.models.customer.responses;
+
+import com.chargebee.v4.models.customer.Customer;
+
+import com.chargebee.v4.models.card.Card;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CustomerRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class CustomerRetrieveResponse extends BaseResponse {
+  private final Customer customer;
+
+  private final Card card;
+
+  private CustomerRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+  }
+
+  /** Parse JSON response into CustomerRetrieveResponse object. */
+  public static CustomerRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CustomerRetrieveResponse object with HTTP response. */
+  public static CustomerRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __customerJson = JsonUtil.getObject(json, "customer");
+      if (__customerJson != null) {
+        builder.customer(Customer.fromJson(__customerJson));
+      }
+
+      String __cardJson = JsonUtil.getObject(json, "card");
+      if (__cardJson != null) {
+        builder.card(Card.fromJson(__cardJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CustomerRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CustomerRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CustomerRetrieveResponse. */
+  public static class Builder {
+
+    private Customer customer;
+
+    private Card card;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder customer(Customer customer) {
+      this.customer = customer;
+      return this;
+    }
+
+    public Builder card(Card card) {
+      this.card = card;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CustomerRetrieveResponse build() {
+      return new CustomerRetrieveResponse(this);
+    }
+  }
+
+  /** Get the customer from the response. */
+  public Customer getCustomer() {
+    return customer;
+  }
+
+  /** Get the card from the response. */
+  public Card getCard() {
+    return card;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerSetPromotionalCreditsResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerSetPromotionalCreditsResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerSetPromotionalCreditsResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerSetPromotionalCreditsResponse.java
index e34a178c..92aef8a3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerSetPromotionalCreditsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerSetPromotionalCreditsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdateBillingInfoResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdateBillingInfoResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdateBillingInfoResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdateBillingInfoResponse.java
index 3d5186a3..bbff2076 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdateBillingInfoResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdateBillingInfoResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdateContactResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdateContactResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdateContactResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdateContactResponse.java
index 636ea459..067307ac 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdateContactResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdateContactResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdateHierarchySettingsResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdateHierarchySettingsResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdateHierarchySettingsResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdateHierarchySettingsResponse.java
index 47a9a79f..ac33b828 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdateHierarchySettingsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdateHierarchySettingsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdatePaymentMethodResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdatePaymentMethodResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdatePaymentMethodResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdatePaymentMethodResponse.java
index 62e7e012..6e44d899 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdatePaymentMethodResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdatePaymentMethodResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdateResponse.java b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdateResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdateResponse.java
index fdf45b24..b9a3281e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customer/CustomerUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customer/responses/CustomerUpdateResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.customer;
+package com.chargebee.v4.models.customer.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/customerEntitlement/CustomerEntitlement.java b/src/main/java/com/chargebee/v4/models/customerEntitlement/CustomerEntitlement.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/customerEntitlement/CustomerEntitlement.java
rename to src/main/java/com/chargebee/v4/models/customerEntitlement/CustomerEntitlement.java
index 4d09bada..de811a67 100644
--- a/src/main/java/com/chargebee/v4/core/models/customerEntitlement/CustomerEntitlement.java
+++ b/src/main/java/com/chargebee/v4/models/customerEntitlement/CustomerEntitlement.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customerEntitlement;
+package com.chargebee.v4.models.customerEntitlement;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/customerEntitlement/params/CustomerEntitlementEntitlementsForCustomerParams.java b/src/main/java/com/chargebee/v4/models/customerEntitlement/params/CustomerEntitlementEntitlementsForCustomerParams.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/customerEntitlement/params/CustomerEntitlementEntitlementsForCustomerParams.java
rename to src/main/java/com/chargebee/v4/models/customerEntitlement/params/CustomerEntitlementEntitlementsForCustomerParams.java
index 87e72bbd..9adbbeae 100644
--- a/src/main/java/com/chargebee/v4/core/models/customerEntitlement/params/CustomerEntitlementEntitlementsForCustomerParams.java
+++ b/src/main/java/com/chargebee/v4/models/customerEntitlement/params/CustomerEntitlementEntitlementsForCustomerParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customerEntitlement.params;
+package com.chargebee.v4.models.customerEntitlement.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/customerEntitlement/CustomerEntitlementEntitlementsForCustomerResponse.java b/src/main/java/com/chargebee/v4/models/customerEntitlement/responses/CustomerEntitlementEntitlementsForCustomerResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/customerEntitlement/CustomerEntitlementEntitlementsForCustomerResponse.java
rename to src/main/java/com/chargebee/v4/models/customerEntitlement/responses/CustomerEntitlementEntitlementsForCustomerResponse.java
index a3f02741..edebfd41 100644
--- a/src/main/java/com/chargebee/v4/core/responses/customerEntitlement/CustomerEntitlementEntitlementsForCustomerResponse.java
+++ b/src/main/java/com/chargebee/v4/models/customerEntitlement/responses/CustomerEntitlementEntitlementsForCustomerResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.customerEntitlement;
+package com.chargebee.v4.models.customerEntitlement.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.customerEntitlement.CustomerEntitlement;
+import com.chargebee.v4.models.customerEntitlement.CustomerEntitlement;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.CustomerEntitlementService;
-import com.chargebee.v4.core.models.customerEntitlement.params.CustomerEntitlementEntitlementsForCustomerParams;
+import com.chargebee.v4.services.CustomerEntitlementService;
+import com.chargebee.v4.models.customerEntitlement.params.CustomerEntitlementEntitlementsForCustomerParams;
 
 /**
  * Immutable response object for CustomerEntitlementEntitlementsForCustomer operation. Contains
@@ -111,9 +112,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public CustomerEntitlementEntitlementsForCustomerResponse nextPage() throws Exception {
+  public CustomerEntitlementEntitlementsForCustomerResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/models/differentialPrice/DifferentialPrice.java b/src/main/java/com/chargebee/v4/models/differentialPrice/DifferentialPrice.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/differentialPrice/DifferentialPrice.java
rename to src/main/java/com/chargebee/v4/models/differentialPrice/DifferentialPrice.java
index 5a0ba9fd..7be55d7a 100644
--- a/src/main/java/com/chargebee/v4/core/models/differentialPrice/DifferentialPrice.java
+++ b/src/main/java/com/chargebee/v4/models/differentialPrice/DifferentialPrice.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.differentialPrice;
+package com.chargebee.v4.models.differentialPrice;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceCreateParams.java b/src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceCreateParams.java
new file mode 100644
index 00000000..66443ade
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceCreateParams.java
@@ -0,0 +1,500 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.differentialPrice.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class DifferentialPriceCreateParams {
+
+  private final String parentItemId;
+
+  private final Long price;
+
+  private final String priceInDecimal;
+
+  private final String businessEntityId;
+
+  private final List<ParentPeriodsParams> parentPeriods;
+
+  private final List<TiersParams> tiers;
+
+  private DifferentialPriceCreateParams(DifferentialPriceCreateBuilder builder) {
+
+    this.parentItemId = builder.parentItemId;
+
+    this.price = builder.price;
+
+    this.priceInDecimal = builder.priceInDecimal;
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.parentPeriods = builder.parentPeriods;
+
+    this.tiers = builder.tiers;
+  }
+
+  public String getParentItemId() {
+    return parentItemId;
+  }
+
+  public Long getPrice() {
+    return price;
+  }
+
+  public String getPriceInDecimal() {
+    return priceInDecimal;
+  }
+
+  public String getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public List<ParentPeriodsParams> getParentPeriods() {
+    return parentPeriods;
+  }
+
+  public List<TiersParams> getTiers() {
+    return tiers;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.parentItemId != null) {
+
+      formData.put("parent_item_id", this.parentItemId);
+    }
+
+    if (this.price != null) {
+
+      formData.put("price", this.price);
+    }
+
+    if (this.priceInDecimal != null) {
+
+      formData.put("price_in_decimal", this.priceInDecimal);
+    }
+
+    if (this.businessEntityId != null) {
+
+      formData.put("business_entity_id", this.businessEntityId);
+    }
+
+    if (this.parentPeriods != null) {
+
+      // List of objects
+      for (int i = 0; i < this.parentPeriods.size(); i++) {
+        ParentPeriodsParams item = this.parentPeriods.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "parent_periods[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.tiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.tiers.size(); i++) {
+        TiersParams item = this.tiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for DifferentialPriceCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static DifferentialPriceCreateBuilder builder() {
+    return new DifferentialPriceCreateBuilder();
+  }
+
+  public static final class DifferentialPriceCreateBuilder {
+
+    private String parentItemId;
+
+    private Long price;
+
+    private String priceInDecimal;
+
+    private String businessEntityId;
+
+    private List<ParentPeriodsParams> parentPeriods;
+
+    private List<TiersParams> tiers;
+
+    private DifferentialPriceCreateBuilder() {}
+
+    public DifferentialPriceCreateBuilder parentItemId(String value) {
+      this.parentItemId = value;
+      return this;
+    }
+
+    public DifferentialPriceCreateBuilder price(Long value) {
+      this.price = value;
+      return this;
+    }
+
+    public DifferentialPriceCreateBuilder priceInDecimal(String value) {
+      this.priceInDecimal = value;
+      return this;
+    }
+
+    public DifferentialPriceCreateBuilder businessEntityId(String value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public DifferentialPriceCreateBuilder parentPeriods(List<ParentPeriodsParams> value) {
+      this.parentPeriods = value;
+      return this;
+    }
+
+    public DifferentialPriceCreateBuilder tiers(List<TiersParams> value) {
+      this.tiers = value;
+      return this;
+    }
+
+    public DifferentialPriceCreateParams build() {
+      return new DifferentialPriceCreateParams(this);
+    }
+  }
+
+  public static final class ParentPeriodsParams {
+
+    private final PeriodUnit periodUnit;
+
+    private final List<Object> period;
+
+    private ParentPeriodsParams(ParentPeriodsBuilder builder) {
+
+      this.periodUnit = builder.periodUnit;
+
+      this.period = builder.period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public List<Object> getPeriod() {
+      return period;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", JsonUtil.toJson(this.period));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ParentPeriodsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ParentPeriodsBuilder builder() {
+      return new ParentPeriodsBuilder();
+    }
+
+    public static final class ParentPeriodsBuilder {
+
+      private PeriodUnit periodUnit;
+
+      private List<Object> period;
+
+      private ParentPeriodsBuilder() {}
+
+      public ParentPeriodsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public ParentPeriodsBuilder period(List<Object> value) {
+        this.period = value;
+        return this;
+      }
+
+      public ParentPeriodsParams build() {
+        return new ParentPeriodsParams(this);
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TiersParams {
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private TiersParams(TiersBuilder builder) {
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TiersBuilder builder() {
+      return new TiersBuilder();
+    }
+
+    public static final class TiersBuilder {
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private TiersBuilder() {}
+
+      public TiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public TiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public TiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public TiersParams build() {
+        return new TiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceDeleteParams.java b/src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceDeleteParams.java
new file mode 100644
index 00000000..79110767
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceDeleteParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.differentialPrice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class DifferentialPriceDeleteParams {
+
+  private final String itemPriceId;
+
+  private DifferentialPriceDeleteParams(DifferentialPriceDeleteBuilder builder) {
+
+    this.itemPriceId = builder.itemPriceId;
+  }
+
+  public String getItemPriceId() {
+    return itemPriceId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.itemPriceId != null) {
+
+      formData.put("item_price_id", this.itemPriceId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for DifferentialPriceDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static DifferentialPriceDeleteBuilder builder() {
+    return new DifferentialPriceDeleteBuilder();
+  }
+
+  public static final class DifferentialPriceDeleteBuilder {
+
+    private String itemPriceId;
+
+    private DifferentialPriceDeleteBuilder() {}
+
+    public DifferentialPriceDeleteBuilder itemPriceId(String value) {
+      this.itemPriceId = value;
+      return this;
+    }
+
+    public DifferentialPriceDeleteParams build() {
+      return new DifferentialPriceDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceListParams.java b/src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceListParams.java
rename to src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceListParams.java
index 99eae08b..6c4fae1e 100644
--- a/src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceListParams.java
+++ b/src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.differentialPrice.params;
+package com.chargebee.v4.models.differentialPrice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceRetrieveParams.java b/src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceRetrieveParams.java
index 3bc9fd9d..7f4fde92 100644
--- a/src/main/java/com/chargebee/v4/core/models/differentialPrice/params/DifferentialPriceRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.differentialPrice.params;
+package com.chargebee.v4.models.differentialPrice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceUpdateParams.java b/src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceUpdateParams.java
new file mode 100644
index 00000000..2fa5d7b7
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/differentialPrice/params/DifferentialPriceUpdateParams.java
@@ -0,0 +1,480 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.differentialPrice.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class DifferentialPriceUpdateParams {
+
+  private final String itemPriceId;
+
+  private final Long price;
+
+  private final String priceInDecimal;
+
+  private final List<ParentPeriodsParams> parentPeriods;
+
+  private final List<TiersParams> tiers;
+
+  private DifferentialPriceUpdateParams(DifferentialPriceUpdateBuilder builder) {
+
+    this.itemPriceId = builder.itemPriceId;
+
+    this.price = builder.price;
+
+    this.priceInDecimal = builder.priceInDecimal;
+
+    this.parentPeriods = builder.parentPeriods;
+
+    this.tiers = builder.tiers;
+  }
+
+  public String getItemPriceId() {
+    return itemPriceId;
+  }
+
+  public Long getPrice() {
+    return price;
+  }
+
+  public String getPriceInDecimal() {
+    return priceInDecimal;
+  }
+
+  public List<ParentPeriodsParams> getParentPeriods() {
+    return parentPeriods;
+  }
+
+  public List<TiersParams> getTiers() {
+    return tiers;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.itemPriceId != null) {
+
+      formData.put("item_price_id", this.itemPriceId);
+    }
+
+    if (this.price != null) {
+
+      formData.put("price", this.price);
+    }
+
+    if (this.priceInDecimal != null) {
+
+      formData.put("price_in_decimal", this.priceInDecimal);
+    }
+
+    if (this.parentPeriods != null) {
+
+      // List of objects
+      for (int i = 0; i < this.parentPeriods.size(); i++) {
+        ParentPeriodsParams item = this.parentPeriods.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "parent_periods[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.tiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.tiers.size(); i++) {
+        TiersParams item = this.tiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for DifferentialPriceUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static DifferentialPriceUpdateBuilder builder() {
+    return new DifferentialPriceUpdateBuilder();
+  }
+
+  public static final class DifferentialPriceUpdateBuilder {
+
+    private String itemPriceId;
+
+    private Long price;
+
+    private String priceInDecimal;
+
+    private List<ParentPeriodsParams> parentPeriods;
+
+    private List<TiersParams> tiers;
+
+    private DifferentialPriceUpdateBuilder() {}
+
+    public DifferentialPriceUpdateBuilder itemPriceId(String value) {
+      this.itemPriceId = value;
+      return this;
+    }
+
+    public DifferentialPriceUpdateBuilder price(Long value) {
+      this.price = value;
+      return this;
+    }
+
+    public DifferentialPriceUpdateBuilder priceInDecimal(String value) {
+      this.priceInDecimal = value;
+      return this;
+    }
+
+    public DifferentialPriceUpdateBuilder parentPeriods(List<ParentPeriodsParams> value) {
+      this.parentPeriods = value;
+      return this;
+    }
+
+    public DifferentialPriceUpdateBuilder tiers(List<TiersParams> value) {
+      this.tiers = value;
+      return this;
+    }
+
+    public DifferentialPriceUpdateParams build() {
+      return new DifferentialPriceUpdateParams(this);
+    }
+  }
+
+  public static final class ParentPeriodsParams {
+
+    private final PeriodUnit periodUnit;
+
+    private final List<Object> period;
+
+    private ParentPeriodsParams(ParentPeriodsBuilder builder) {
+
+      this.periodUnit = builder.periodUnit;
+
+      this.period = builder.period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public List<Object> getPeriod() {
+      return period;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", JsonUtil.toJson(this.period));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ParentPeriodsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ParentPeriodsBuilder builder() {
+      return new ParentPeriodsBuilder();
+    }
+
+    public static final class ParentPeriodsBuilder {
+
+      private PeriodUnit periodUnit;
+
+      private List<Object> period;
+
+      private ParentPeriodsBuilder() {}
+
+      public ParentPeriodsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public ParentPeriodsBuilder period(List<Object> value) {
+        this.period = value;
+        return this;
+      }
+
+      public ParentPeriodsParams build() {
+        return new ParentPeriodsParams(this);
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TiersParams {
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private TiersParams(TiersBuilder builder) {
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TiersBuilder builder() {
+      return new TiersBuilder();
+    }
+
+    public static final class TiersBuilder {
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private TiersBuilder() {}
+
+      public TiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public TiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public TiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public TiersParams build() {
+        return new TiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceCreateResponse.java b/src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceCreateResponse.java
index 3b41c2da..74f021d7 100644
--- a/src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.differentialPrice;
+package com.chargebee.v4.models.differentialPrice.responses;
 
-import com.chargebee.v4.core.models.differentialPrice.DifferentialPrice;
+import com.chargebee.v4.models.differentialPrice.DifferentialPrice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceDeleteResponse.java b/src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceDeleteResponse.java
index 29b31468..bc010822 100644
--- a/src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.differentialPrice;
+package com.chargebee.v4.models.differentialPrice.responses;
 
-import com.chargebee.v4.core.models.differentialPrice.DifferentialPrice;
+import com.chargebee.v4.models.differentialPrice.DifferentialPrice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceListResponse.java b/src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceListResponse.java
rename to src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceListResponse.java
index 96bdd0e6..f445a3e5 100644
--- a/src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.differentialPrice;
+package com.chargebee.v4.models.differentialPrice.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.differentialPrice.DifferentialPrice;
+import com.chargebee.v4.models.differentialPrice.DifferentialPrice;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.DifferentialPriceService;
-import com.chargebee.v4.core.models.differentialPrice.params.DifferentialPriceListParams;
+import com.chargebee.v4.services.DifferentialPriceService;
+import com.chargebee.v4.models.differentialPrice.params.DifferentialPriceListParams;
 
 /** Immutable response object for DifferentialPriceList operation. Contains paginated list data. */
 public final class DifferentialPriceListResponse {
@@ -99,9 +100,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public DifferentialPriceListResponse nextPage() throws Exception {
+  public DifferentialPriceListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceRetrieveResponse.java
new file mode 100644
index 00000000..821f4588
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.differentialPrice.responses;
+
+import com.chargebee.v4.models.differentialPrice.DifferentialPrice;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for DifferentialPriceRetrieve operation. Contains the response data
+ * from a single resource get operation.
+ */
+public final class DifferentialPriceRetrieveResponse extends BaseResponse {
+  private final DifferentialPrice differentialPrice;
+
+  private DifferentialPriceRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.differentialPrice = builder.differentialPrice;
+  }
+
+  /** Parse JSON response into DifferentialPriceRetrieveResponse object. */
+  public static DifferentialPriceRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into DifferentialPriceRetrieveResponse object with HTTP response. */
+  public static DifferentialPriceRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __differentialPriceJson = JsonUtil.getObject(json, "differential_price");
+      if (__differentialPriceJson != null) {
+        builder.differentialPrice(DifferentialPrice.fromJson(__differentialPriceJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse DifferentialPriceRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for DifferentialPriceRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for DifferentialPriceRetrieveResponse. */
+  public static class Builder {
+
+    private DifferentialPrice differentialPrice;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder differentialPrice(DifferentialPrice differentialPrice) {
+      this.differentialPrice = differentialPrice;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public DifferentialPriceRetrieveResponse build() {
+      return new DifferentialPriceRetrieveResponse(this);
+    }
+  }
+
+  /** Get the differentialPrice from the response. */
+  public DifferentialPrice getDifferentialPrice() {
+    return differentialPrice;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceUpdateResponse.java b/src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceUpdateResponse.java
index 26d44670..65486752 100644
--- a/src/main/java/com/chargebee/v4/core/responses/differentialPrice/DifferentialPriceUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.differentialPrice;
+package com.chargebee.v4.models.differentialPrice.responses;
 
-import com.chargebee.v4.core.models.differentialPrice.DifferentialPrice;
+import com.chargebee.v4.models.differentialPrice.DifferentialPrice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/discount/Discount.java b/src/main/java/com/chargebee/v4/models/discount/Discount.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/discount/Discount.java
rename to src/main/java/com/chargebee/v4/models/discount/Discount.java
index 6b47c65d..3289ff2b 100644
--- a/src/main/java/com/chargebee/v4/core/models/discount/Discount.java
+++ b/src/main/java/com/chargebee/v4/models/discount/Discount.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.discount;
+package com.chargebee.v4.models.discount;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/download/Download.java b/src/main/java/com/chargebee/v4/models/download/Download.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/download/Download.java
rename to src/main/java/com/chargebee/v4/models/download/Download.java
index c4f80f17..1bfdc4cb 100644
--- a/src/main/java/com/chargebee/v4/core/models/download/Download.java
+++ b/src/main/java/com/chargebee/v4/models/download/Download.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.download;
+package com.chargebee.v4.models.download;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/einvoice/Einvoice.java b/src/main/java/com/chargebee/v4/models/einvoice/Einvoice.java
new file mode 100644
index 00000000..4b91afb2
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/einvoice/Einvoice.java
@@ -0,0 +1,84 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.einvoice;
+
+import com.chargebee.v4.internal.JsonUtil;
+
+public class Einvoice {
+
+  private String id;
+  private String referenceNumber;
+  private Status status;
+  private String message;
+
+  public String getId() {
+    return id;
+  }
+
+  public String getReferenceNumber() {
+    return referenceNumber;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public String getMessage() {
+    return message;
+  }
+
+  public enum Status {
+    SCHEDULED("scheduled"),
+
+    SKIPPED("skipped"),
+
+    IN_PROGRESS("in_progress"),
+
+    SUCCESS("success"),
+
+    FAILED("failed"),
+
+    REGISTERED("registered"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static Einvoice fromJson(String json) {
+    Einvoice obj = new Einvoice();
+
+    obj.id = JsonUtil.getString(json, "id");
+
+    obj.referenceNumber = JsonUtil.getString(json, "reference_number");
+
+    obj.status = Status.fromString(JsonUtil.getString(json, "status"));
+
+    obj.message = JsonUtil.getString(json, "message");
+
+    return obj;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/entitlement/Entitlement.java b/src/main/java/com/chargebee/v4/models/entitlement/Entitlement.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/entitlement/Entitlement.java
rename to src/main/java/com/chargebee/v4/models/entitlement/Entitlement.java
index 101d465a..9c87d5cd 100644
--- a/src/main/java/com/chargebee/v4/core/models/entitlement/Entitlement.java
+++ b/src/main/java/com/chargebee/v4/models/entitlement/Entitlement.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.entitlement;
+package com.chargebee.v4.models.entitlement;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/models/entitlement/params/EntitlementCreateParams.java b/src/main/java/com/chargebee/v4/models/entitlement/params/EntitlementCreateParams.java
new file mode 100644
index 00000000..7fe05091
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/entitlement/params/EntitlementCreateParams.java
@@ -0,0 +1,301 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.entitlement.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class EntitlementCreateParams {
+
+  private final Action action;
+
+  private final String changeReason;
+
+  private final List<EntitlementsParams> entitlements;
+
+  private EntitlementCreateParams(EntitlementCreateBuilder builder) {
+
+    this.action = builder.action;
+
+    this.changeReason = builder.changeReason;
+
+    this.entitlements = builder.entitlements;
+  }
+
+  public Action getAction() {
+    return action;
+  }
+
+  public String getChangeReason() {
+    return changeReason;
+  }
+
+  public List<EntitlementsParams> getEntitlements() {
+    return entitlements;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.action != null) {
+
+      formData.put("action", this.action);
+    }
+
+    if (this.changeReason != null) {
+
+      formData.put("change_reason", this.changeReason);
+    }
+
+    if (this.entitlements != null) {
+
+      // List of objects
+      for (int i = 0; i < this.entitlements.size(); i++) {
+        EntitlementsParams item = this.entitlements.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "entitlements[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EntitlementCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EntitlementCreateBuilder builder() {
+    return new EntitlementCreateBuilder();
+  }
+
+  public static final class EntitlementCreateBuilder {
+
+    private Action action;
+
+    private String changeReason;
+
+    private List<EntitlementsParams> entitlements;
+
+    private EntitlementCreateBuilder() {}
+
+    public EntitlementCreateBuilder action(Action value) {
+      this.action = value;
+      return this;
+    }
+
+    public EntitlementCreateBuilder changeReason(String value) {
+      this.changeReason = value;
+      return this;
+    }
+
+    public EntitlementCreateBuilder entitlements(List<EntitlementsParams> value) {
+      this.entitlements = value;
+      return this;
+    }
+
+    public EntitlementCreateParams build() {
+      return new EntitlementCreateParams(this);
+    }
+  }
+
+  public enum Action {
+    UPSERT("upsert"),
+
+    REMOVE("remove"),
+
+    /** An enum member indicating that Action was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Action(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Action fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Action enumValue : Action.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class EntitlementsParams {
+
+    private final String entityId;
+
+    private final String featureId;
+
+    private final EntityType entityType;
+
+    private final String value;
+
+    private final Boolean applyGrandfathering;
+
+    private EntitlementsParams(EntitlementsBuilder builder) {
+
+      this.entityId = builder.entityId;
+
+      this.featureId = builder.featureId;
+
+      this.entityType = builder.entityType;
+
+      this.value = builder.value;
+
+      this.applyGrandfathering = builder.applyGrandfathering;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    public String getFeatureId() {
+      return featureId;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public Boolean getApplyGrandfathering() {
+      return applyGrandfathering;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      if (this.featureId != null) {
+
+        formData.put("feature_id", this.featureId);
+      }
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      if (this.applyGrandfathering != null) {
+
+        formData.put("apply_grandfathering", this.applyGrandfathering);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EntitlementsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EntitlementsBuilder builder() {
+      return new EntitlementsBuilder();
+    }
+
+    public static final class EntitlementsBuilder {
+
+      private String entityId;
+
+      private String featureId;
+
+      private EntityType entityType;
+
+      private String value;
+
+      private Boolean applyGrandfathering;
+
+      private EntitlementsBuilder() {}
+
+      public EntitlementsBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public EntitlementsBuilder featureId(String value) {
+        this.featureId = value;
+        return this;
+      }
+
+      public EntitlementsBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public EntitlementsBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public EntitlementsBuilder applyGrandfathering(Boolean value) {
+        this.applyGrandfathering = value;
+        return this;
+      }
+
+      public EntitlementsParams build() {
+        return new EntitlementsParams(this);
+      }
+    }
+
+    public enum EntityType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      PLAN_PRICE("plan_price"),
+
+      ADDON_PRICE("addon_price"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/entitlement/params/EntitlementListParams.java b/src/main/java/com/chargebee/v4/models/entitlement/params/EntitlementListParams.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/entitlement/params/EntitlementListParams.java
rename to src/main/java/com/chargebee/v4/models/entitlement/params/EntitlementListParams.java
index 34404734..fb09f25c 100644
--- a/src/main/java/com/chargebee/v4/core/models/entitlement/params/EntitlementListParams.java
+++ b/src/main/java/com/chargebee/v4/models/entitlement/params/EntitlementListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.entitlement.params;
+package com.chargebee.v4.models.entitlement.params;
 
 import com.chargebee.v4.internal.Recommended;
 
@@ -90,13 +90,13 @@ public static final class FeatureIdFilter {
         this.builder = builder;
       }
 
-      public EntitlementListBuilder in(String... values) {
-        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
+      public EntitlementListBuilder is(String value) {
+        builder.queryParams.put(fieldName + "[is]", value);
         return builder;
       }
 
-      public EntitlementListBuilder is(String value) {
-        builder.queryParams.put(fieldName + "[is]", value);
+      public EntitlementListBuilder in(String... values) {
+        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
         return builder;
       }
     }
@@ -110,13 +110,13 @@ public static final class EntityTypeFilter {
         this.builder = builder;
       }
 
-      public EntitlementListBuilder in(String... values) {
-        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
+      public EntitlementListBuilder is(String value) {
+        builder.queryParams.put(fieldName + "[is]", value);
         return builder;
       }
 
-      public EntitlementListBuilder is(String value) {
-        builder.queryParams.put(fieldName + "[is]", value);
+      public EntitlementListBuilder in(String... values) {
+        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
         return builder;
       }
     }
@@ -130,13 +130,13 @@ public static final class EntityIdFilter {
         this.builder = builder;
       }
 
-      public EntitlementListBuilder in(String... values) {
-        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
+      public EntitlementListBuilder is(String value) {
+        builder.queryParams.put(fieldName + "[is]", value);
         return builder;
       }
 
-      public EntitlementListBuilder is(String value) {
-        builder.queryParams.put(fieldName + "[is]", value);
+      public EntitlementListBuilder in(String... values) {
+        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
         return builder;
       }
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/entitlement/EntitlementCreateResponse.java b/src/main/java/com/chargebee/v4/models/entitlement/responses/EntitlementCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/entitlement/EntitlementCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/entitlement/responses/EntitlementCreateResponse.java
index 2b763022..171399d8 100644
--- a/src/main/java/com/chargebee/v4/core/responses/entitlement/EntitlementCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/entitlement/responses/EntitlementCreateResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.entitlement;
+package com.chargebee.v4.models.entitlement.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.entitlement.Entitlement;
+import com.chargebee.v4.models.entitlement.Entitlement;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/entitlement/EntitlementListResponse.java b/src/main/java/com/chargebee/v4/models/entitlement/responses/EntitlementListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/entitlement/EntitlementListResponse.java
rename to src/main/java/com/chargebee/v4/models/entitlement/responses/EntitlementListResponse.java
index 2f33f6ae..83526389 100644
--- a/src/main/java/com/chargebee/v4/core/responses/entitlement/EntitlementListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/entitlement/responses/EntitlementListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.entitlement;
+package com.chargebee.v4.models.entitlement.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.entitlement.Entitlement;
+import com.chargebee.v4.models.entitlement.Entitlement;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.EntitlementService;
-import com.chargebee.v4.core.models.entitlement.params.EntitlementListParams;
+import com.chargebee.v4.services.EntitlementService;
+import com.chargebee.v4.models.entitlement.params.EntitlementListParams;
 
 /** Immutable response object for EntitlementList operation. Contains paginated list data. */
 public final class EntitlementListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public EntitlementListResponse nextPage() throws Exception {
+  public EntitlementListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/models/entitlementOverride/EntitlementOverride.java b/src/main/java/com/chargebee/v4/models/entitlementOverride/EntitlementOverride.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/entitlementOverride/EntitlementOverride.java
rename to src/main/java/com/chargebee/v4/models/entitlementOverride/EntitlementOverride.java
index 6f07b27c..f7bd3b1f 100644
--- a/src/main/java/com/chargebee/v4/core/models/entitlementOverride/EntitlementOverride.java
+++ b/src/main/java/com/chargebee/v4/models/entitlementOverride/EntitlementOverride.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.entitlementOverride;
+package com.chargebee.v4.models.entitlementOverride;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/entitlementOverride/params/AddEntitlementOverrideForSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/entitlementOverride/params/AddEntitlementOverrideForSubscriptionParams.java
new file mode 100644
index 00000000..bfbf5473
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/entitlementOverride/params/AddEntitlementOverrideForSubscriptionParams.java
@@ -0,0 +1,230 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.entitlementOverride.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class AddEntitlementOverrideForSubscriptionParams {
+
+  private final Action action;
+
+  private final List<EntitlementOverridesParams> entitlementOverrides;
+
+  private AddEntitlementOverrideForSubscriptionParams(
+      AddEntitlementOverrideForSubscriptionBuilder builder) {
+
+    this.action = builder.action;
+
+    this.entitlementOverrides = builder.entitlementOverrides;
+  }
+
+  public Action getAction() {
+    return action;
+  }
+
+  public List<EntitlementOverridesParams> getEntitlementOverrides() {
+    return entitlementOverrides;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.action != null) {
+
+      formData.put("action", this.action);
+    }
+
+    if (this.entitlementOverrides != null) {
+
+      // List of objects
+      for (int i = 0; i < this.entitlementOverrides.size(); i++) {
+        EntitlementOverridesParams item = this.entitlementOverrides.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "entitlement_overrides[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for AddEntitlementOverrideForSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static AddEntitlementOverrideForSubscriptionBuilder builder() {
+    return new AddEntitlementOverrideForSubscriptionBuilder();
+  }
+
+  public static final class AddEntitlementOverrideForSubscriptionBuilder {
+
+    private Action action;
+
+    private List<EntitlementOverridesParams> entitlementOverrides;
+
+    private AddEntitlementOverrideForSubscriptionBuilder() {}
+
+    public AddEntitlementOverrideForSubscriptionBuilder action(Action value) {
+      this.action = value;
+      return this;
+    }
+
+    public AddEntitlementOverrideForSubscriptionBuilder entitlementOverrides(
+        List<EntitlementOverridesParams> value) {
+      this.entitlementOverrides = value;
+      return this;
+    }
+
+    public AddEntitlementOverrideForSubscriptionParams build() {
+      return new AddEntitlementOverrideForSubscriptionParams(this);
+    }
+  }
+
+  public enum Action {
+    UPSERT("upsert"),
+
+    REMOVE("remove"),
+
+    /** An enum member indicating that Action was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Action(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Action fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Action enumValue : Action.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class EntitlementOverridesParams {
+
+    private final String featureId;
+
+    private final String value;
+
+    private final Timestamp expiresAt;
+
+    private final Timestamp effectiveFrom;
+
+    private EntitlementOverridesParams(EntitlementOverridesBuilder builder) {
+
+      this.featureId = builder.featureId;
+
+      this.value = builder.value;
+
+      this.expiresAt = builder.expiresAt;
+
+      this.effectiveFrom = builder.effectiveFrom;
+    }
+
+    public String getFeatureId() {
+      return featureId;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public Timestamp getExpiresAt() {
+      return expiresAt;
+    }
+
+    public Timestamp getEffectiveFrom() {
+      return effectiveFrom;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.featureId != null) {
+
+        formData.put("feature_id", this.featureId);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      if (this.expiresAt != null) {
+
+        formData.put("expires_at", this.expiresAt);
+      }
+
+      if (this.effectiveFrom != null) {
+
+        formData.put("effective_from", this.effectiveFrom);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EntitlementOverridesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EntitlementOverridesBuilder builder() {
+      return new EntitlementOverridesBuilder();
+    }
+
+    public static final class EntitlementOverridesBuilder {
+
+      private String featureId;
+
+      private String value;
+
+      private Timestamp expiresAt;
+
+      private Timestamp effectiveFrom;
+
+      private EntitlementOverridesBuilder() {}
+
+      public EntitlementOverridesBuilder featureId(String value) {
+        this.featureId = value;
+        return this;
+      }
+
+      public EntitlementOverridesBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public EntitlementOverridesBuilder expiresAt(Timestamp value) {
+        this.expiresAt = value;
+        return this;
+      }
+
+      public EntitlementOverridesBuilder effectiveFrom(Timestamp value) {
+        this.effectiveFrom = value;
+        return this;
+      }
+
+      public EntitlementOverridesParams build() {
+        return new EntitlementOverridesParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/entitlementOverride/params/ListEntitlementOverrideForSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/entitlementOverride/params/ListEntitlementOverrideForSubscriptionParams.java
new file mode 100644
index 00000000..089593c7
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/entitlementOverride/params/ListEntitlementOverrideForSubscriptionParams.java
@@ -0,0 +1,80 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.entitlementOverride.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ListEntitlementOverrideForSubscriptionParams {
+
+  private final Map<String, Object> queryParams;
+
+  private ListEntitlementOverrideForSubscriptionParams(
+      ListEntitlementOverrideForSubscriptionBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public ListEntitlementOverrideForSubscriptionBuilder toBuilder() {
+    ListEntitlementOverrideForSubscriptionBuilder builder =
+        new ListEntitlementOverrideForSubscriptionBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for ListEntitlementOverrideForSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ListEntitlementOverrideForSubscriptionBuilder builder() {
+    return new ListEntitlementOverrideForSubscriptionBuilder();
+  }
+
+  public static final class ListEntitlementOverrideForSubscriptionBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private ListEntitlementOverrideForSubscriptionBuilder() {}
+
+    public ListEntitlementOverrideForSubscriptionBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public ListEntitlementOverrideForSubscriptionBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    @Deprecated
+    public ListEntitlementOverrideForSubscriptionBuilder embed(String value) {
+      queryParams.put("embed", value);
+      return this;
+    }
+
+    @Deprecated
+    public ListEntitlementOverrideForSubscriptionBuilder includeDrafts(Boolean value) {
+      queryParams.put("include_drafts", value);
+      return this;
+    }
+
+    @Deprecated
+    public ListEntitlementOverrideForSubscriptionBuilder includeScheduledOverrides(Boolean value) {
+      queryParams.put("include_scheduled_overrides", value);
+      return this;
+    }
+
+    public ListEntitlementOverrideForSubscriptionParams build() {
+      return new ListEntitlementOverrideForSubscriptionParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/entitlementOverride/responses/AddEntitlementOverrideForSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/entitlementOverride/responses/AddEntitlementOverrideForSubscriptionResponse.java
new file mode 100644
index 00000000..3a0df2fb
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/entitlementOverride/responses/AddEntitlementOverrideForSubscriptionResponse.java
@@ -0,0 +1,84 @@
+package com.chargebee.v4.models.entitlementOverride.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.entitlementOverride.EntitlementOverride;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for AddEntitlementOverrideForSubscription operation. Contains the
+ * response data from the API.
+ */
+public final class AddEntitlementOverrideForSubscriptionResponse extends BaseResponse {
+  private final List<EntitlementOverride> list;
+
+  private AddEntitlementOverrideForSubscriptionResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.list = builder.list;
+  }
+
+  /** Parse JSON response into AddEntitlementOverrideForSubscriptionResponse object. */
+  public static AddEntitlementOverrideForSubscriptionResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into AddEntitlementOverrideForSubscriptionResponse object with HTTP
+   * response.
+   */
+  public static AddEntitlementOverrideForSubscriptionResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.list(
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(EntitlementOverride::fromJson)
+              .collect(java.util.stream.Collectors.toList()));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse AddEntitlementOverrideForSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for AddEntitlementOverrideForSubscriptionResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for AddEntitlementOverrideForSubscriptionResponse. */
+  public static class Builder {
+
+    private List<EntitlementOverride> list;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder list(List<EntitlementOverride> list) {
+      this.list = list;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public AddEntitlementOverrideForSubscriptionResponse build() {
+      return new AddEntitlementOverrideForSubscriptionResponse(this);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<EntitlementOverride> getList() {
+    return list;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/entitlementOverride/responses/ListEntitlementOverrideForSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/entitlementOverride/responses/ListEntitlementOverrideForSubscriptionResponse.java
new file mode 100644
index 00000000..e9def75c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/entitlementOverride/responses/ListEntitlementOverrideForSubscriptionResponse.java
@@ -0,0 +1,182 @@
+package com.chargebee.v4.models.entitlementOverride.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.entitlementOverride.EntitlementOverride;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.EntitlementOverrideService;
+import com.chargebee.v4.models.entitlementOverride.params.ListEntitlementOverrideForSubscriptionParams;
+
+/**
+ * Immutable response object for ListEntitlementOverrideForSubscription operation. Contains
+ * paginated list data.
+ */
+public final class ListEntitlementOverrideForSubscriptionResponse {
+
+  private final List<EntitlementOverrideListEntitlementOverrideForSubscriptionItem> list;
+
+  private final String nextOffset;
+
+  private final String subscriptionId;
+
+  private final EntitlementOverrideService service;
+  private final ListEntitlementOverrideForSubscriptionParams originalParams;
+  private final Response httpResponse;
+
+  private ListEntitlementOverrideForSubscriptionResponse(
+      List<EntitlementOverrideListEntitlementOverrideForSubscriptionItem> list,
+      String nextOffset,
+      String subscriptionId,
+      EntitlementOverrideService service,
+      ListEntitlementOverrideForSubscriptionParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.subscriptionId = subscriptionId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into ListEntitlementOverrideForSubscriptionResponse object (no service
+   * context). Use this when you only need to read a single page (no nextPage()).
+   */
+  public static ListEntitlementOverrideForSubscriptionResponse fromJson(String json) {
+    try {
+
+      List<EntitlementOverrideListEntitlementOverrideForSubscriptionItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(EntitlementOverrideListEntitlementOverrideForSubscriptionItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new ListEntitlementOverrideForSubscriptionResponse(
+          list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse ListEntitlementOverrideForSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into ListEntitlementOverrideForSubscriptionResponse object with service
+   * context for pagination (enables nextPage()).
+   */
+  public static ListEntitlementOverrideForSubscriptionResponse fromJson(
+      String json,
+      EntitlementOverrideService service,
+      ListEntitlementOverrideForSubscriptionParams originalParams,
+      String subscriptionId,
+      Response httpResponse) {
+    try {
+
+      List<EntitlementOverrideListEntitlementOverrideForSubscriptionItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(EntitlementOverrideListEntitlementOverrideForSubscriptionItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new ListEntitlementOverrideForSubscriptionResponse(
+          list, nextOffset, subscriptionId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse ListEntitlementOverrideForSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<EntitlementOverrideListEntitlementOverrideForSubscriptionItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public ListEntitlementOverrideForSubscriptionResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    ListEntitlementOverrideForSubscriptionParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : ListEntitlementOverrideForSubscriptionParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.listEntitlementOverrideForSubscription(subscriptionId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class EntitlementOverrideListEntitlementOverrideForSubscriptionItem {
+
+    private EntitlementOverride entitlementOverride;
+
+    public EntitlementOverride getEntitlementOverride() {
+      return entitlementOverride;
+    }
+
+    public static EntitlementOverrideListEntitlementOverrideForSubscriptionItem fromJson(
+        String json) {
+      EntitlementOverrideListEntitlementOverrideForSubscriptionItem item =
+          new EntitlementOverrideListEntitlementOverrideForSubscriptionItem();
+
+      String __entitlementOverrideJson = JsonUtil.getObject(json, "entitlement_override");
+      if (__entitlementOverrideJson != null) {
+        item.entitlementOverride = EntitlementOverride.fromJson(__entitlementOverrideJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/estimate/Estimate.java b/src/main/java/com/chargebee/v4/models/estimate/Estimate.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/estimate/Estimate.java
rename to src/main/java/com/chargebee/v4/models/estimate/Estimate.java
index 6778263d..fc198bc1 100644
--- a/src/main/java/com/chargebee/v4/core/models/estimate/Estimate.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/Estimate.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.estimate;
+package com.chargebee.v4.models.estimate;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.math.BigDecimal;
@@ -2043,6 +2043,7 @@ public static class Discounts {
 
       private Long amount;
       private String description;
+      private String lineItemId;
       private EntityType entityType;
       private DiscountType discountType;
       private String entityId;
@@ -2056,6 +2057,10 @@ public String getDescription() {
         return description;
       }
 
+      public String getLineItemId() {
+        return lineItemId;
+      }
+
       public EntityType getEntityType() {
         return entityType;
       }
@@ -2143,6 +2148,8 @@ public static Discounts fromJson(String json) {
 
         obj.description = JsonUtil.getString(json, "description");
 
+        obj.lineItemId = JsonUtil.getString(json, "line_item_id");
+
         obj.entityType = EntityType.fromString(JsonUtil.getString(json, "entity_type"));
 
         obj.discountType = DiscountType.fromString(JsonUtil.getString(json, "discount_type"));
@@ -3216,6 +3223,7 @@ public static class Discounts {
 
       private Long amount;
       private String description;
+      private String lineItemId;
       private EntityType entityType;
       private DiscountType discountType;
       private String entityId;
@@ -3229,6 +3237,10 @@ public String getDescription() {
         return description;
       }
 
+      public String getLineItemId() {
+        return lineItemId;
+      }
+
       public EntityType getEntityType() {
         return entityType;
       }
@@ -3316,6 +3328,8 @@ public static Discounts fromJson(String json) {
 
         obj.description = JsonUtil.getString(json, "description");
 
+        obj.lineItemId = JsonUtil.getString(json, "line_item_id");
+
         obj.entityType = EntityType.fromString(JsonUtil.getString(json, "entity_type"));
 
         obj.discountType = DiscountType.fromString(JsonUtil.getString(json, "discount_type"));
@@ -4545,6 +4559,7 @@ public static class Discounts {
 
       private Long amount;
       private String description;
+      private String lineItemId;
       private EntityType entityType;
       private DiscountType discountType;
       private String entityId;
@@ -4558,6 +4573,10 @@ public String getDescription() {
         return description;
       }
 
+      public String getLineItemId() {
+        return lineItemId;
+      }
+
       public EntityType getEntityType() {
         return entityType;
       }
@@ -4645,6 +4664,8 @@ public static Discounts fromJson(String json) {
 
         obj.description = JsonUtil.getString(json, "description");
 
+        obj.lineItemId = JsonUtil.getString(json, "line_item_id");
+
         obj.entityType = EntityType.fromString(JsonUtil.getString(json, "entity_type"));
 
         obj.discountType = DiscountType.fromString(JsonUtil.getString(json, "discount_type"));
@@ -5547,6 +5568,7 @@ public static class Discounts {
 
       private Long amount;
       private String description;
+      private String lineItemId;
       private EntityType entityType;
       private DiscountType discountType;
       private String entityId;
@@ -5560,6 +5582,10 @@ public String getDescription() {
         return description;
       }
 
+      public String getLineItemId() {
+        return lineItemId;
+      }
+
       public EntityType getEntityType() {
         return entityType;
       }
@@ -5647,6 +5673,8 @@ public static Discounts fromJson(String json) {
 
         obj.description = JsonUtil.getString(json, "description");
 
+        obj.lineItemId = JsonUtil.getString(json, "line_item_id");
+
         obj.entityType = EntityType.fromString(JsonUtil.getString(json, "entity_type"));
 
         obj.discountType = DiscountType.fromString(JsonUtil.getString(json, "discount_type"));
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/AdvanceInvoiceEstimateParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/AdvanceInvoiceEstimateParams.java
new file mode 100644
index 00000000..6dbdaff2
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/AdvanceInvoiceEstimateParams.java
@@ -0,0 +1,394 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class AdvanceInvoiceEstimateParams {
+
+  private final Integer termsToCharge;
+
+  private final Boolean invoiceImmediately;
+
+  private final ScheduleType scheduleType;
+
+  private final FixedIntervalScheduleParams fixedIntervalSchedule;
+
+  private final List<SpecificDatesScheduleParams> specificDatesSchedule;
+
+  private AdvanceInvoiceEstimateParams(AdvanceInvoiceEstimateBuilder builder) {
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.scheduleType = builder.scheduleType;
+
+    this.fixedIntervalSchedule = builder.fixedIntervalSchedule;
+
+    this.specificDatesSchedule = builder.specificDatesSchedule;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public ScheduleType getScheduleType() {
+    return scheduleType;
+  }
+
+  public FixedIntervalScheduleParams getFixedIntervalSchedule() {
+    return fixedIntervalSchedule;
+  }
+
+  public List<SpecificDatesScheduleParams> getSpecificDatesSchedule() {
+    return specificDatesSchedule;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.scheduleType != null) {
+
+      formData.put("schedule_type", this.scheduleType);
+    }
+
+    if (this.fixedIntervalSchedule != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.fixedIntervalSchedule.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "fixed_interval_schedule[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.specificDatesSchedule != null) {
+
+      // List of objects
+      for (int i = 0; i < this.specificDatesSchedule.size(); i++) {
+        SpecificDatesScheduleParams item = this.specificDatesSchedule.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "specific_dates_schedule[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for AdvanceInvoiceEstimateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static AdvanceInvoiceEstimateBuilder builder() {
+    return new AdvanceInvoiceEstimateBuilder();
+  }
+
+  public static final class AdvanceInvoiceEstimateBuilder {
+
+    private Integer termsToCharge;
+
+    private Boolean invoiceImmediately;
+
+    private ScheduleType scheduleType;
+
+    private FixedIntervalScheduleParams fixedIntervalSchedule;
+
+    private List<SpecificDatesScheduleParams> specificDatesSchedule;
+
+    private AdvanceInvoiceEstimateBuilder() {}
+
+    public AdvanceInvoiceEstimateBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public AdvanceInvoiceEstimateBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public AdvanceInvoiceEstimateBuilder scheduleType(ScheduleType value) {
+      this.scheduleType = value;
+      return this;
+    }
+
+    public AdvanceInvoiceEstimateBuilder fixedIntervalSchedule(FixedIntervalScheduleParams value) {
+      this.fixedIntervalSchedule = value;
+      return this;
+    }
+
+    public AdvanceInvoiceEstimateBuilder specificDatesSchedule(
+        List<SpecificDatesScheduleParams> value) {
+      this.specificDatesSchedule = value;
+      return this;
+    }
+
+    public AdvanceInvoiceEstimateParams build() {
+      return new AdvanceInvoiceEstimateParams(this);
+    }
+  }
+
+  public enum ScheduleType {
+    IMMEDIATE("immediate"),
+
+    SPECIFIC_DATES("specific_dates"),
+
+    FIXED_INTERVALS("fixed_intervals"),
+
+    /** An enum member indicating that ScheduleType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ScheduleType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ScheduleType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ScheduleType enumValue : ScheduleType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class FixedIntervalScheduleParams {
+
+    private final Integer numberOfOccurrences;
+
+    private final Integer daysBeforeRenewal;
+
+    private final EndScheduleOn endScheduleOn;
+
+    private final Timestamp endDate;
+
+    private FixedIntervalScheduleParams(FixedIntervalScheduleBuilder builder) {
+
+      this.numberOfOccurrences = builder.numberOfOccurrences;
+
+      this.daysBeforeRenewal = builder.daysBeforeRenewal;
+
+      this.endScheduleOn = builder.endScheduleOn;
+
+      this.endDate = builder.endDate;
+    }
+
+    public Integer getNumberOfOccurrences() {
+      return numberOfOccurrences;
+    }
+
+    public Integer getDaysBeforeRenewal() {
+      return daysBeforeRenewal;
+    }
+
+    public EndScheduleOn getEndScheduleOn() {
+      return endScheduleOn;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.numberOfOccurrences != null) {
+
+        formData.put("number_of_occurrences", this.numberOfOccurrences);
+      }
+
+      if (this.daysBeforeRenewal != null) {
+
+        formData.put("days_before_renewal", this.daysBeforeRenewal);
+      }
+
+      if (this.endScheduleOn != null) {
+
+        formData.put("end_schedule_on", this.endScheduleOn);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for FixedIntervalScheduleParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static FixedIntervalScheduleBuilder builder() {
+      return new FixedIntervalScheduleBuilder();
+    }
+
+    public static final class FixedIntervalScheduleBuilder {
+
+      private Integer numberOfOccurrences;
+
+      private Integer daysBeforeRenewal;
+
+      private EndScheduleOn endScheduleOn;
+
+      private Timestamp endDate;
+
+      private FixedIntervalScheduleBuilder() {}
+
+      public FixedIntervalScheduleBuilder numberOfOccurrences(Integer value) {
+        this.numberOfOccurrences = value;
+        return this;
+      }
+
+      public FixedIntervalScheduleBuilder daysBeforeRenewal(Integer value) {
+        this.daysBeforeRenewal = value;
+        return this;
+      }
+
+      public FixedIntervalScheduleBuilder endScheduleOn(EndScheduleOn value) {
+        this.endScheduleOn = value;
+        return this;
+      }
+
+      public FixedIntervalScheduleBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public FixedIntervalScheduleParams build() {
+        return new FixedIntervalScheduleParams(this);
+      }
+    }
+
+    public enum EndScheduleOn {
+      AFTER_NUMBER_OF_INTERVALS("after_number_of_intervals"),
+
+      SPECIFIC_DATE("specific_date"),
+
+      SUBSCRIPTION_END("subscription_end"),
+
+      /** An enum member indicating that EndScheduleOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EndScheduleOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EndScheduleOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EndScheduleOn enumValue : EndScheduleOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SpecificDatesScheduleParams {
+
+    private final Integer termsToCharge;
+
+    private final Timestamp date;
+
+    private SpecificDatesScheduleParams(SpecificDatesScheduleBuilder builder) {
+
+      this.termsToCharge = builder.termsToCharge;
+
+      this.date = builder.date;
+    }
+
+    public Integer getTermsToCharge() {
+      return termsToCharge;
+    }
+
+    public Timestamp getDate() {
+      return date;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.termsToCharge != null) {
+
+        formData.put("terms_to_charge", this.termsToCharge);
+      }
+
+      if (this.date != null) {
+
+        formData.put("date", this.date);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SpecificDatesScheduleParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SpecificDatesScheduleBuilder builder() {
+      return new SpecificDatesScheduleBuilder();
+    }
+
+    public static final class SpecificDatesScheduleBuilder {
+
+      private Integer termsToCharge;
+
+      private Timestamp date;
+
+      private SpecificDatesScheduleBuilder() {}
+
+      public SpecificDatesScheduleBuilder termsToCharge(Integer value) {
+        this.termsToCharge = value;
+        return this;
+      }
+
+      public SpecificDatesScheduleBuilder date(Timestamp value) {
+        this.date = value;
+        return this;
+      }
+
+      public SpecificDatesScheduleParams build() {
+        return new SpecificDatesScheduleParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/CreateSubscriptionForCustomerEstimateParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/CreateSubscriptionForCustomerEstimateParams.java
new file mode 100644
index 00000000..633c1571
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/CreateSubscriptionForCustomerEstimateParams.java
@@ -0,0 +1,902 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.sql.Timestamp;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class CreateSubscriptionForCustomerEstimateParams {
+
+  private final Map<String, Object> queryParams;
+
+  private CreateSubscriptionForCustomerEstimateParams(
+      CreateSubscriptionForCustomerEstimateBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public CreateSubscriptionForCustomerEstimateBuilder toBuilder() {
+    CreateSubscriptionForCustomerEstimateBuilder builder =
+        new CreateSubscriptionForCustomerEstimateBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for CreateSubscriptionForCustomerEstimateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreateSubscriptionForCustomerEstimateBuilder builder() {
+    return new CreateSubscriptionForCustomerEstimateBuilder();
+  }
+
+  public static final class CreateSubscriptionForCustomerEstimateBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private CreateSubscriptionForCustomerEstimateBuilder() {}
+
+    public CreateSubscriptionForCustomerEstimateBuilder useExistingBalances(Boolean value) {
+      queryParams.put("use_existing_balances", value);
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateBuilder invoiceImmediately(Boolean value) {
+      queryParams.put("invoice_immediately", value);
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateBuilder billingCycles(Integer value) {
+      queryParams.put("billing_cycles", value);
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateBuilder mandatoryAddonsToRemove(
+        List<String> value) {
+      queryParams.put("mandatory_addons_to_remove", value);
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateBuilder termsToCharge(Integer value) {
+      queryParams.put("terms_to_charge", value);
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateBuilder billingAlignmentMode(
+        BillingAlignmentMode value) {
+      queryParams.put("billing_alignment_mode", value);
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateBuilder invoiceDate(Timestamp value) {
+      queryParams.put("invoice_date", value);
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateBuilder couponIds(List<String> value) {
+      queryParams.put("coupon_ids", value);
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateBuilder subscription(SubscriptionParams value) {
+      queryParams.put("subscription", value);
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateBuilder shippingAddress(
+        ShippingAddressParams value) {
+      queryParams.put("shipping_address", value);
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateBuilder contractTerm(ContractTermParams value) {
+      queryParams.put("contract_term", value);
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateBuilder addons(AddonsParams value) {
+      queryParams.put("addons", value);
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateBuilder eventBasedAddons(
+        EventBasedAddonsParams value) {
+      queryParams.put("event_based_addons", value);
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateParams build() {
+      return new CreateSubscriptionForCustomerEstimateParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum SubscriptionOfflinePaymentMethod {
+    NO_PREFERENCE("no_preference"),
+
+    CASH("cash"),
+
+    CHECK("check"),
+
+    BANK_TRANSFER("bank_transfer"),
+
+    ACH_CREDIT("ach_credit"),
+
+    SEPA_CREDIT("sepa_credit"),
+
+    BOLETO("boleto"),
+
+    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+    CUSTOM("custom"),
+
+    /**
+     * An enum member indicating that SubscriptionOfflinePaymentMethod was instantiated with an
+     * unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    SubscriptionOfflinePaymentMethod(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static SubscriptionOfflinePaymentMethod fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (SubscriptionOfflinePaymentMethod enumValue : SubscriptionOfflinePaymentMethod.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum SubscriptionFreePeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /**
+     * An enum member indicating that SubscriptionFreePeriodUnit was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    SubscriptionFreePeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static SubscriptionFreePeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (SubscriptionFreePeriodUnit enumValue : SubscriptionFreePeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum SubscriptionTrialEndAction {
+    SITE_DEFAULT("site_default"),
+
+    PLAN_DEFAULT("plan_default"),
+
+    ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+    CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+    /**
+     * An enum member indicating that SubscriptionTrialEndAction was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    SubscriptionTrialEndAction(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static SubscriptionTrialEndAction fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (SubscriptionTrialEndAction enumValue : SubscriptionTrialEndAction.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ShippingAddressValidationStatus {
+    NOT_VALIDATED("not_validated"),
+
+    VALID("valid"),
+
+    PARTIALLY_VALID("partially_valid"),
+
+    INVALID("invalid"),
+
+    /**
+     * An enum member indicating that ShippingAddressValidationStatus was instantiated with an
+     * unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    ShippingAddressValidationStatus(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ShippingAddressValidationStatus fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ShippingAddressValidationStatus enumValue : ShippingAddressValidationStatus.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ContractTermActionAtTermEnd {
+    RENEW("renew"),
+
+    EVERGREEN("evergreen"),
+
+    CANCEL("cancel"),
+
+    /**
+     * An enum member indicating that ContractTermActionAtTermEnd was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    ContractTermActionAtTermEnd(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ContractTermActionAtTermEnd fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ContractTermActionAtTermEnd enumValue : ContractTermActionAtTermEnd.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final Map<String, Object> queryParams;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+      this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+    }
+
+    /** Get the query parameters for this request. */
+    public Map<String, Object> toQueryParams() {
+      return queryParams;
+    }
+
+    public SubscriptionBuilder toBuilder() {
+      SubscriptionBuilder builder = new SubscriptionBuilder();
+      builder.queryParams.putAll(queryParams);
+      return builder;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+      private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        queryParams.put("id", value);
+        return this;
+      }
+
+      public SubscriptionBuilder planId(String value) {
+        queryParams.put("plan_id", value);
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantity(Integer value) {
+        queryParams.put("plan_quantity", value);
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantityInDecimal(String value) {
+        queryParams.put("plan_quantity_in_decimal", value);
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPrice(Long value) {
+        queryParams.put("plan_unit_price", value);
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
+        queryParams.put("plan_unit_price_in_decimal", value);
+        return this;
+      }
+
+      public SubscriptionBuilder setupFee(Long value) {
+        queryParams.put("setup_fee", value);
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        queryParams.put("trial_end", value);
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        queryParams.put("start_date", value);
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        queryParams.put("offline_payment_method", value);
+        return this;
+      }
+
+      public SubscriptionBuilder freePeriod(Integer value) {
+        queryParams.put("free_period", value);
+        return this;
+      }
+
+      public SubscriptionBuilder freePeriodUnit(FreePeriodUnit value) {
+        queryParams.put("free_period_unit", value);
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        queryParams.put("contract_term_billing_cycle_on_renewal", value);
+        return this;
+      }
+
+      public SubscriptionBuilder trialEndAction(TrialEndAction value) {
+        queryParams.put("trial_end_action", value);
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum FreePeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      FreePeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static FreePeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum TrialEndAction {
+      SITE_DEFAULT("site_default"),
+
+      PLAN_DEFAULT("plan_default"),
+
+      ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+      CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+      /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      TrialEndAction(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static TrialEndAction fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (TrialEndAction enumValue : TrialEndAction.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final Map<String, Object> queryParams;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+      this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+    }
+
+    /** Get the query parameters for this request. */
+    public Map<String, Object> toQueryParams() {
+      return queryParams;
+    }
+
+    public ShippingAddressBuilder toBuilder() {
+      ShippingAddressBuilder builder = new ShippingAddressBuilder();
+      builder.queryParams.putAll(queryParams);
+      return builder;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+      private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder line1(String value) {
+        queryParams.put("line1", value);
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        queryParams.put("line2", value);
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        queryParams.put("line3", value);
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        queryParams.put("city", value);
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        queryParams.put("state_code", value);
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        queryParams.put("zip", value);
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        queryParams.put("country", value);
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        queryParams.put("validation_status", value);
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final Map<String, Object> queryParams;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+      this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+    }
+
+    /** Get the query parameters for this request. */
+    public Map<String, Object> toQueryParams() {
+      return queryParams;
+    }
+
+    public ContractTermBuilder toBuilder() {
+      ContractTermBuilder builder = new ContractTermBuilder();
+      builder.queryParams.putAll(queryParams);
+      return builder;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+      private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        queryParams.put("action_at_term_end", value);
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        queryParams.put("cancellation_cutoff_period", value);
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final Map<String, Object> queryParams;
+
+    private AddonsParams(AddonsBuilder builder) {
+      this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+    }
+
+    /** Get the query parameters for this request. */
+    public Map<String, Object> toQueryParams() {
+      return queryParams;
+    }
+
+    public AddonsBuilder toBuilder() {
+      AddonsBuilder builder = new AddonsBuilder();
+      builder.queryParams.putAll(queryParams);
+      return builder;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+      private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(List<String> value) {
+        queryParams.put("id", value);
+        return this;
+      }
+
+      public AddonsBuilder quantity(List<Integer> value) {
+        queryParams.put("quantity", value);
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(List<String> value) {
+        queryParams.put("quantity_in_decimal", value);
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(List<Integer> value) {
+        queryParams.put("unit_price", value);
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(List<String> value) {
+        queryParams.put("unit_price_in_decimal", value);
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(List<Integer> value) {
+        queryParams.put("billing_cycles", value);
+        return this;
+      }
+
+      public AddonsBuilder trialEnd(List<Integer> value) {
+        queryParams.put("trial_end", value);
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final Map<String, Object> queryParams;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+      this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+    }
+
+    /** Get the query parameters for this request. */
+    public Map<String, Object> toQueryParams() {
+      return queryParams;
+    }
+
+    public EventBasedAddonsBuilder toBuilder() {
+      EventBasedAddonsBuilder builder = new EventBasedAddonsBuilder();
+      builder.queryParams.putAll(queryParams);
+      return builder;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+      private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(List<String> value) {
+        queryParams.put("id", value);
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(List<Integer> value) {
+        queryParams.put("quantity", value);
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(List<Integer> value) {
+        queryParams.put("unit_price", value);
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(List<String> value) {
+        queryParams.put("quantity_in_decimal", value);
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(List<String> value) {
+        queryParams.put("unit_price_in_decimal", value);
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(List<Integer> value) {
+        queryParams.put("service_period_in_days", value);
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(List<String> value) {
+        queryParams.put("on_event", value);
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(List<Boolean> value) {
+        queryParams.put("charge_once", value);
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOn(List<String> value) {
+        queryParams.put("charge_on", value);
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/CreateSubscriptionItemEstimateParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/CreateSubscriptionItemEstimateParams.java
new file mode 100644
index 00000000..1a6698cb
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/CreateSubscriptionItemEstimateParams.java
@@ -0,0 +1,2680 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class CreateSubscriptionItemEstimateParams {
+
+  private final Integer billingCycles;
+
+  private final List<String> mandatoryItemsToRemove;
+
+  private final Integer termsToCharge;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final Boolean invoiceImmediately;
+
+  private final Timestamp invoiceDate;
+
+  private final String clientProfileId;
+
+  private final SubscriptionParams subscription;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final CustomerParams customer;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private CreateSubscriptionItemEstimateParams(CreateSubscriptionItemEstimateBuilder builder) {
+
+    this.billingCycles = builder.billingCycles;
+
+    this.mandatoryItemsToRemove = builder.mandatoryItemsToRemove;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.clientProfileId = builder.clientProfileId;
+
+    this.subscription = builder.subscription;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.customer = builder.customer;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.discounts = builder.discounts;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public List<String> getMandatoryItemsToRemove() {
+    return mandatoryItemsToRemove;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public String getClientProfileId() {
+    return clientProfileId;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.mandatoryItemsToRemove != null) {
+
+      formData.put("mandatory_items_to_remove", this.mandatoryItemsToRemove);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.clientProfileId != null) {
+
+      formData.put("client_profile_id", this.clientProfileId);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CreateSubscriptionItemEstimateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreateSubscriptionItemEstimateBuilder builder() {
+    return new CreateSubscriptionItemEstimateBuilder();
+  }
+
+  public static final class CreateSubscriptionItemEstimateBuilder {
+
+    private Integer billingCycles;
+
+    private List<String> mandatoryItemsToRemove;
+
+    private Integer termsToCharge;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private Boolean invoiceImmediately;
+
+    private Timestamp invoiceDate;
+
+    private String clientProfileId;
+
+    private SubscriptionParams subscription;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private CustomerParams customer;
+
+    private ContractTermParams contractTerm;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<DiscountsParams> discounts;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private CreateSubscriptionItemEstimateBuilder() {}
+
+    public CreateSubscriptionItemEstimateBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder mandatoryItemsToRemove(List<String> value) {
+      this.mandatoryItemsToRemove = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder clientProfileId(String value) {
+      this.clientProfileId = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateBuilder taxProvidersFields(
+        List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateParams build() {
+      return new CreateSubscriptionItemEstimateParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final Timestamp trialEnd;
+
+    private final Long setupFee;
+
+    private final Timestamp startDate;
+
+    private final String coupon;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Integer freePeriod;
+
+    private final FreePeriodUnit freePeriodUnit;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private final TrialEndAction trialEndAction;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.setupFee = builder.setupFee;
+
+      this.startDate = builder.startDate;
+
+      this.coupon = builder.coupon;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.freePeriod = builder.freePeriod;
+
+      this.freePeriodUnit = builder.freePeriodUnit;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+      this.trialEndAction = builder.trialEndAction;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public String getCoupon() {
+      return coupon;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Integer getFreePeriod() {
+      return freePeriod;
+    }
+
+    public FreePeriodUnit getFreePeriodUnit() {
+      return freePeriodUnit;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    public TrialEndAction getTrialEndAction() {
+      return trialEndAction;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.coupon != null) {
+
+        formData.put("coupon", this.coupon);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.freePeriod != null) {
+
+        formData.put("free_period", this.freePeriod);
+      }
+
+      if (this.freePeriodUnit != null) {
+
+        formData.put("free_period_unit", this.freePeriodUnit);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      if (this.trialEndAction != null) {
+
+        formData.put("trial_end_action", this.trialEndAction);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private Timestamp trialEnd;
+
+      private Long setupFee;
+
+      private Timestamp startDate;
+
+      private String coupon;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Integer freePeriod;
+
+      private FreePeriodUnit freePeriodUnit;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private TrialEndAction trialEndAction;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder coupon(String value) {
+        this.coupon = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder freePeriod(Integer value) {
+        this.freePeriod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder freePeriodUnit(FreePeriodUnit value) {
+        this.freePeriodUnit = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEndAction(TrialEndAction value) {
+        this.trialEndAction = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum FreePeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      FreePeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static FreePeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum TrialEndAction {
+      SITE_DEFAULT("site_default"),
+
+      PLAN_DEFAULT("plan_default"),
+
+      ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+      CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+      /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      TrialEndAction(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static TrialEndAction fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (TrialEndAction enumValue : TrialEndAction.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final Boolean registeredForGst;
+
+    private final Taxability taxability;
+
+    private final EntityCode entityCode;
+
+    private final String exemptNumber;
+
+    private final List<Object> exemptionDetails;
+
+    private final CustomerType customerType;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.registeredForGst = builder.registeredForGst;
+
+      this.taxability = builder.taxability;
+
+      this.entityCode = builder.entityCode;
+
+      this.exemptNumber = builder.exemptNumber;
+
+      this.exemptionDetails = builder.exemptionDetails;
+
+      this.customerType = builder.customerType;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public Boolean getRegisteredForGst() {
+      return registeredForGst;
+    }
+
+    public Taxability getTaxability() {
+      return taxability;
+    }
+
+    public EntityCode getEntityCode() {
+      return entityCode;
+    }
+
+    public String getExemptNumber() {
+      return exemptNumber;
+    }
+
+    public List<Object> getExemptionDetails() {
+      return exemptionDetails;
+    }
+
+    public CustomerType getCustomerType() {
+      return customerType;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.registeredForGst != null) {
+
+        formData.put("registered_for_gst", this.registeredForGst);
+      }
+
+      if (this.taxability != null) {
+
+        formData.put("taxability", this.taxability);
+      }
+
+      if (this.entityCode != null) {
+
+        formData.put("entity_code", this.entityCode);
+      }
+
+      if (this.exemptNumber != null) {
+
+        formData.put("exempt_number", this.exemptNumber);
+      }
+
+      if (this.exemptionDetails != null) {
+
+        formData.put("exemption_details", JsonUtil.toJson(this.exemptionDetails));
+      }
+
+      if (this.customerType != null) {
+
+        formData.put("customer_type", this.customerType);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private Boolean registeredForGst;
+
+      private Taxability taxability;
+
+      private EntityCode entityCode;
+
+      private String exemptNumber;
+
+      private List<Object> exemptionDetails;
+
+      private CustomerType customerType;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder registeredForGst(Boolean value) {
+        this.registeredForGst = value;
+        return this;
+      }
+
+      public CustomerBuilder taxability(Taxability value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerBuilder entityCode(EntityCode value) {
+        this.entityCode = value;
+        return this;
+      }
+
+      public CustomerBuilder exemptNumber(String value) {
+        this.exemptNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder exemptionDetails(List<Object> value) {
+        this.exemptionDetails = value;
+        return this;
+      }
+
+      public CustomerBuilder customerType(CustomerType value) {
+        this.customerType = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+
+    public enum Taxability {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Taxability was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Taxability(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Taxability fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Taxability enumValue : Taxability.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum EntityCode {
+      A("a"),
+
+      B("b"),
+
+      C("c"),
+
+      D("d"),
+
+      E("e"),
+
+      F("f"),
+
+      G("g"),
+
+      H("h"),
+
+      I("i"),
+
+      J("j"),
+
+      K("k"),
+
+      L("l"),
+
+      M("m"),
+
+      N("n"),
+
+      P("p"),
+
+      Q("q"),
+
+      R("r"),
+
+      MED_1("med1"),
+
+      MED_2("med2"),
+
+      /** An enum member indicating that EntityCode was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityCode(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityCode fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityCode enumValue : EntityCode.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum CustomerType {
+      RESIDENTIAL("residential"),
+
+      BUSINESS("business"),
+
+      SENIOR_CITIZEN("senior_citizen"),
+
+      INDUSTRIAL("industrial"),
+
+      /** An enum member indicating that CustomerType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      CustomerType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static CustomerType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (CustomerType enumValue : CustomerType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Timestamp contractStart;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.contractStart = builder.contractStart;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Timestamp getContractStart() {
+      return contractStart;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.contractStart != null) {
+
+        formData.put("contract_start", this.contractStart);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Timestamp contractStart;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public ContractTermBuilder contractStart(Timestamp value) {
+        this.contractStart = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ItemType itemType;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.itemType = builder.itemType;
+
+      this.chargeOnOption = builder.chargeOnOption;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ItemType itemType;
+
+      private ChargeOnOption chargeOnOption;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/CreateSubscriptionItemForCustomerEstimateParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/CreateSubscriptionItemForCustomerEstimateParams.java
new file mode 100644
index 00000000..c1aaea24
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/CreateSubscriptionItemForCustomerEstimateParams.java
@@ -0,0 +1,2303 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class CreateSubscriptionItemForCustomerEstimateParams {
+
+  private final Boolean useExistingBalances;
+
+  private final Boolean invoiceImmediately;
+
+  private final Integer billingCycles;
+
+  private final List<String> mandatoryItemsToRemove;
+
+  private final Integer termsToCharge;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final Timestamp invoiceDate;
+
+  private final List<String> couponIds;
+
+  private final SubscriptionParams subscription;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ContractTermParams contractTerm;
+
+  private final BillingOverrideParams billingOverride;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private CreateSubscriptionItemForCustomerEstimateParams(
+      CreateSubscriptionItemForCustomerEstimateBuilder builder) {
+
+    this.useExistingBalances = builder.useExistingBalances;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.mandatoryItemsToRemove = builder.mandatoryItemsToRemove;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.couponIds = builder.couponIds;
+
+    this.subscription = builder.subscription;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.billingOverride = builder.billingOverride;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.discounts = builder.discounts;
+
+    this.itemTiers = builder.itemTiers;
+  }
+
+  public Boolean getUseExistingBalances() {
+    return useExistingBalances;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public List<String> getMandatoryItemsToRemove() {
+    return mandatoryItemsToRemove;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public BillingOverrideParams getBillingOverride() {
+    return billingOverride;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.useExistingBalances != null) {
+
+      formData.put("use_existing_balances", this.useExistingBalances);
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.mandatoryItemsToRemove != null) {
+
+      formData.put("mandatory_items_to_remove", this.mandatoryItemsToRemove);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingOverride != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingOverride.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_override[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CreateSubscriptionItemForCustomerEstimateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreateSubscriptionItemForCustomerEstimateBuilder builder() {
+    return new CreateSubscriptionItemForCustomerEstimateBuilder();
+  }
+
+  public static final class CreateSubscriptionItemForCustomerEstimateBuilder {
+
+    private Boolean useExistingBalances;
+
+    private Boolean invoiceImmediately;
+
+    private Integer billingCycles;
+
+    private List<String> mandatoryItemsToRemove;
+
+    private Integer termsToCharge;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private Timestamp invoiceDate;
+
+    private List<String> couponIds;
+
+    private SubscriptionParams subscription;
+
+    private ShippingAddressParams shippingAddress;
+
+    private BillingAddressParams billingAddress;
+
+    private ContractTermParams contractTerm;
+
+    private BillingOverrideParams billingOverride;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<DiscountsParams> discounts;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private CreateSubscriptionItemForCustomerEstimateBuilder() {}
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder useExistingBalances(Boolean value) {
+      this.useExistingBalances = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder mandatoryItemsToRemove(
+        List<String> value) {
+      this.mandatoryItemsToRemove = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder billingAlignmentMode(
+        BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder shippingAddress(
+        ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder billingAddress(
+        BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder billingOverride(
+        BillingOverrideParams value) {
+      this.billingOverride = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateParams build() {
+      return new CreateSubscriptionItemForCustomerEstimateParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final Timestamp trialEnd;
+
+    private final Long setupFee;
+
+    private final Timestamp startDate;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Integer freePeriod;
+
+    private final FreePeriodUnit freePeriodUnit;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private final TrialEndAction trialEndAction;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.setupFee = builder.setupFee;
+
+      this.startDate = builder.startDate;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.freePeriod = builder.freePeriod;
+
+      this.freePeriodUnit = builder.freePeriodUnit;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+      this.trialEndAction = builder.trialEndAction;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Integer getFreePeriod() {
+      return freePeriod;
+    }
+
+    public FreePeriodUnit getFreePeriodUnit() {
+      return freePeriodUnit;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    public TrialEndAction getTrialEndAction() {
+      return trialEndAction;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.freePeriod != null) {
+
+        formData.put("free_period", this.freePeriod);
+      }
+
+      if (this.freePeriodUnit != null) {
+
+        formData.put("free_period_unit", this.freePeriodUnit);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      if (this.trialEndAction != null) {
+
+        formData.put("trial_end_action", this.trialEndAction);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private Timestamp trialEnd;
+
+      private Long setupFee;
+
+      private Timestamp startDate;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Integer freePeriod;
+
+      private FreePeriodUnit freePeriodUnit;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private TrialEndAction trialEndAction;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder freePeriod(Integer value) {
+        this.freePeriod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder freePeriodUnit(FreePeriodUnit value) {
+        this.freePeriodUnit = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEndAction(TrialEndAction value) {
+        this.trialEndAction = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum FreePeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      FreePeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static FreePeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum TrialEndAction {
+      SITE_DEFAULT("site_default"),
+
+      PLAN_DEFAULT("plan_default"),
+
+      ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+      CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+      /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      TrialEndAction(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static TrialEndAction fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (TrialEndAction enumValue : TrialEndAction.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Timestamp contractStart;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.contractStart = builder.contractStart;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Timestamp getContractStart() {
+      return contractStart;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.contractStart != null) {
+
+        formData.put("contract_start", this.contractStart);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Timestamp contractStart;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public ContractTermBuilder contractStart(Timestamp value) {
+        this.contractStart = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingOverrideParams {
+
+    private final Long maxExcessPaymentUsage;
+
+    private final Long maxRefundableCreditsUsage;
+
+    private BillingOverrideParams(BillingOverrideBuilder builder) {
+
+      this.maxExcessPaymentUsage = builder.maxExcessPaymentUsage;
+
+      this.maxRefundableCreditsUsage = builder.maxRefundableCreditsUsage;
+    }
+
+    public Long getMaxExcessPaymentUsage() {
+      return maxExcessPaymentUsage;
+    }
+
+    public Long getMaxRefundableCreditsUsage() {
+      return maxRefundableCreditsUsage;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.maxExcessPaymentUsage != null) {
+
+        formData.put("max_excess_payment_usage", this.maxExcessPaymentUsage);
+      }
+
+      if (this.maxRefundableCreditsUsage != null) {
+
+        formData.put("max_refundable_credits_usage", this.maxRefundableCreditsUsage);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingOverrideParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingOverrideBuilder builder() {
+      return new BillingOverrideBuilder();
+    }
+
+    public static final class BillingOverrideBuilder {
+
+      private Long maxExcessPaymentUsage;
+
+      private Long maxRefundableCreditsUsage;
+
+      private BillingOverrideBuilder() {}
+
+      public BillingOverrideBuilder maxExcessPaymentUsage(Long value) {
+        this.maxExcessPaymentUsage = value;
+        return this;
+      }
+
+      public BillingOverrideBuilder maxRefundableCreditsUsage(Long value) {
+        this.maxRefundableCreditsUsage = value;
+        return this;
+      }
+
+      public BillingOverrideParams build() {
+        return new BillingOverrideParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ItemType itemType;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.itemType = builder.itemType;
+
+      this.chargeOnOption = builder.chargeOnOption;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ItemType itemType;
+
+      private ChargeOnOption chargeOnOption;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCancelSubscriptionForItemsParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCancelSubscriptionForItemsParams.java
new file mode 100644
index 00000000..56aad632
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCancelSubscriptionForItemsParams.java
@@ -0,0 +1,623 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EstimateCancelSubscriptionForItemsParams {
+
+  private final CancelOption cancelOption;
+
+  private final Boolean endOfTerm;
+
+  private final Timestamp cancelAt;
+
+  private final CreditOptionForCurrentTermCharges creditOptionForCurrentTermCharges;
+
+  private final UnbilledChargesOption unbilledChargesOption;
+
+  private final AccountReceivablesHandling accountReceivablesHandling;
+
+  private final RefundableCreditsHandling refundableCreditsHandling;
+
+  private final ContractTermCancelOption contractTermCancelOption;
+
+  private final Timestamp invoiceDate;
+
+  private final String cancelReasonCode;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private EstimateCancelSubscriptionForItemsParams(
+      EstimateCancelSubscriptionForItemsBuilder builder) {
+
+    this.cancelOption = builder.cancelOption;
+
+    this.endOfTerm = builder.endOfTerm;
+
+    this.cancelAt = builder.cancelAt;
+
+    this.creditOptionForCurrentTermCharges = builder.creditOptionForCurrentTermCharges;
+
+    this.unbilledChargesOption = builder.unbilledChargesOption;
+
+    this.accountReceivablesHandling = builder.accountReceivablesHandling;
+
+    this.refundableCreditsHandling = builder.refundableCreditsHandling;
+
+    this.contractTermCancelOption = builder.contractTermCancelOption;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.cancelReasonCode = builder.cancelReasonCode;
+
+    this.subscriptionItems = builder.subscriptionItems;
+  }
+
+  public CancelOption getCancelOption() {
+    return cancelOption;
+  }
+
+  public Boolean getEndOfTerm() {
+    return endOfTerm;
+  }
+
+  public Timestamp getCancelAt() {
+    return cancelAt;
+  }
+
+  public CreditOptionForCurrentTermCharges getCreditOptionForCurrentTermCharges() {
+    return creditOptionForCurrentTermCharges;
+  }
+
+  public UnbilledChargesOption getUnbilledChargesOption() {
+    return unbilledChargesOption;
+  }
+
+  public AccountReceivablesHandling getAccountReceivablesHandling() {
+    return accountReceivablesHandling;
+  }
+
+  public RefundableCreditsHandling getRefundableCreditsHandling() {
+    return refundableCreditsHandling;
+  }
+
+  public ContractTermCancelOption getContractTermCancelOption() {
+    return contractTermCancelOption;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public String getCancelReasonCode() {
+    return cancelReasonCode;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.cancelOption != null) {
+
+      formData.put("cancel_option", this.cancelOption);
+    }
+
+    if (this.endOfTerm != null) {
+
+      formData.put("end_of_term", this.endOfTerm);
+    }
+
+    if (this.cancelAt != null) {
+
+      formData.put("cancel_at", this.cancelAt);
+    }
+
+    if (this.creditOptionForCurrentTermCharges != null) {
+
+      formData.put(
+          "credit_option_for_current_term_charges", this.creditOptionForCurrentTermCharges);
+    }
+
+    if (this.unbilledChargesOption != null) {
+
+      formData.put("unbilled_charges_option", this.unbilledChargesOption);
+    }
+
+    if (this.accountReceivablesHandling != null) {
+
+      formData.put("account_receivables_handling", this.accountReceivablesHandling);
+    }
+
+    if (this.refundableCreditsHandling != null) {
+
+      formData.put("refundable_credits_handling", this.refundableCreditsHandling);
+    }
+
+    if (this.contractTermCancelOption != null) {
+
+      formData.put("contract_term_cancel_option", this.contractTermCancelOption);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.cancelReasonCode != null) {
+
+      formData.put("cancel_reason_code", this.cancelReasonCode);
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EstimateCancelSubscriptionForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EstimateCancelSubscriptionForItemsBuilder builder() {
+    return new EstimateCancelSubscriptionForItemsBuilder();
+  }
+
+  public static final class EstimateCancelSubscriptionForItemsBuilder {
+
+    private CancelOption cancelOption;
+
+    private Boolean endOfTerm;
+
+    private Timestamp cancelAt;
+
+    private CreditOptionForCurrentTermCharges creditOptionForCurrentTermCharges;
+
+    private UnbilledChargesOption unbilledChargesOption;
+
+    private AccountReceivablesHandling accountReceivablesHandling;
+
+    private RefundableCreditsHandling refundableCreditsHandling;
+
+    private ContractTermCancelOption contractTermCancelOption;
+
+    private Timestamp invoiceDate;
+
+    private String cancelReasonCode;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private EstimateCancelSubscriptionForItemsBuilder() {}
+
+    public EstimateCancelSubscriptionForItemsBuilder cancelOption(CancelOption value) {
+      this.cancelOption = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionForItemsBuilder endOfTerm(Boolean value) {
+      this.endOfTerm = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionForItemsBuilder cancelAt(Timestamp value) {
+      this.cancelAt = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionForItemsBuilder creditOptionForCurrentTermCharges(
+        CreditOptionForCurrentTermCharges value) {
+      this.creditOptionForCurrentTermCharges = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionForItemsBuilder unbilledChargesOption(
+        UnbilledChargesOption value) {
+      this.unbilledChargesOption = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionForItemsBuilder accountReceivablesHandling(
+        AccountReceivablesHandling value) {
+      this.accountReceivablesHandling = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionForItemsBuilder refundableCreditsHandling(
+        RefundableCreditsHandling value) {
+      this.refundableCreditsHandling = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionForItemsBuilder contractTermCancelOption(
+        ContractTermCancelOption value) {
+      this.contractTermCancelOption = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionForItemsBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionForItemsBuilder cancelReasonCode(String value) {
+      this.cancelReasonCode = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionForItemsBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionForItemsParams build() {
+      return new EstimateCancelSubscriptionForItemsParams(this);
+    }
+  }
+
+  public enum CancelOption {
+    IMMEDIATELY("immediately"),
+
+    END_OF_TERM("end_of_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    END_OF_BILLING_TERM("end_of_billing_term"),
+
+    /** An enum member indicating that CancelOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CancelOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CancelOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CancelOption enumValue : CancelOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum CreditOptionForCurrentTermCharges {
+    NONE("none"),
+
+    PRORATE("prorate"),
+
+    FULL("full"),
+
+    /**
+     * An enum member indicating that CreditOptionForCurrentTermCharges was instantiated with an
+     * unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    CreditOptionForCurrentTermCharges(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CreditOptionForCurrentTermCharges fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CreditOptionForCurrentTermCharges enumValue :
+          CreditOptionForCurrentTermCharges.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum UnbilledChargesOption {
+    INVOICE("invoice"),
+
+    DELETE("delete"),
+
+    /**
+     * An enum member indicating that UnbilledChargesOption was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    UnbilledChargesOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static UnbilledChargesOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (UnbilledChargesOption enumValue : UnbilledChargesOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AccountReceivablesHandling {
+    NO_ACTION("no_action"),
+
+    SCHEDULE_PAYMENT_COLLECTION("schedule_payment_collection"),
+
+    WRITE_OFF("write_off"),
+
+    /**
+     * An enum member indicating that AccountReceivablesHandling was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    AccountReceivablesHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AccountReceivablesHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AccountReceivablesHandling enumValue : AccountReceivablesHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum RefundableCreditsHandling {
+    NO_ACTION("no_action"),
+
+    SCHEDULE_REFUND("schedule_refund"),
+
+    /**
+     * An enum member indicating that RefundableCreditsHandling was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    RefundableCreditsHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static RefundableCreditsHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (RefundableCreditsHandling enumValue : RefundableCreditsHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ContractTermCancelOption {
+    TERMINATE_IMMEDIATELY("terminate_immediately"),
+
+    END_OF_CONTRACT_TERM("end_of_contract_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    END_OF_SUBSCRIPTION_BILLING_TERM("end_of_subscription_billing_term"),
+
+    /**
+     * An enum member indicating that ContractTermCancelOption was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    ContractTermCancelOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ContractTermCancelOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ContractTermCancelOption enumValue : ContractTermCancelOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriodDays;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriodDays;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCancelSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCancelSubscriptionParams.java
new file mode 100644
index 00000000..c924f284
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCancelSubscriptionParams.java
@@ -0,0 +1,580 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EstimateCancelSubscriptionParams {
+
+  private final CancelOption cancelOption;
+
+  private final Boolean endOfTerm;
+
+  private final Timestamp cancelAt;
+
+  private final CreditOptionForCurrentTermCharges creditOptionForCurrentTermCharges;
+
+  private final UnbilledChargesOption unbilledChargesOption;
+
+  private final AccountReceivablesHandling accountReceivablesHandling;
+
+  private final RefundableCreditsHandling refundableCreditsHandling;
+
+  private final ContractTermCancelOption contractTermCancelOption;
+
+  private final Timestamp invoiceDate;
+
+  private final String cancelReasonCode;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private EstimateCancelSubscriptionParams(EstimateCancelSubscriptionBuilder builder) {
+
+    this.cancelOption = builder.cancelOption;
+
+    this.endOfTerm = builder.endOfTerm;
+
+    this.cancelAt = builder.cancelAt;
+
+    this.creditOptionForCurrentTermCharges = builder.creditOptionForCurrentTermCharges;
+
+    this.unbilledChargesOption = builder.unbilledChargesOption;
+
+    this.accountReceivablesHandling = builder.accountReceivablesHandling;
+
+    this.refundableCreditsHandling = builder.refundableCreditsHandling;
+
+    this.contractTermCancelOption = builder.contractTermCancelOption;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.cancelReasonCode = builder.cancelReasonCode;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+  }
+
+  public CancelOption getCancelOption() {
+    return cancelOption;
+  }
+
+  public Boolean getEndOfTerm() {
+    return endOfTerm;
+  }
+
+  public Timestamp getCancelAt() {
+    return cancelAt;
+  }
+
+  public CreditOptionForCurrentTermCharges getCreditOptionForCurrentTermCharges() {
+    return creditOptionForCurrentTermCharges;
+  }
+
+  public UnbilledChargesOption getUnbilledChargesOption() {
+    return unbilledChargesOption;
+  }
+
+  public AccountReceivablesHandling getAccountReceivablesHandling() {
+    return accountReceivablesHandling;
+  }
+
+  public RefundableCreditsHandling getRefundableCreditsHandling() {
+    return refundableCreditsHandling;
+  }
+
+  public ContractTermCancelOption getContractTermCancelOption() {
+    return contractTermCancelOption;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public String getCancelReasonCode() {
+    return cancelReasonCode;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.cancelOption != null) {
+
+      formData.put("cancel_option", this.cancelOption);
+    }
+
+    if (this.endOfTerm != null) {
+
+      formData.put("end_of_term", this.endOfTerm);
+    }
+
+    if (this.cancelAt != null) {
+
+      formData.put("cancel_at", this.cancelAt);
+    }
+
+    if (this.creditOptionForCurrentTermCharges != null) {
+
+      formData.put(
+          "credit_option_for_current_term_charges", this.creditOptionForCurrentTermCharges);
+    }
+
+    if (this.unbilledChargesOption != null) {
+
+      formData.put("unbilled_charges_option", this.unbilledChargesOption);
+    }
+
+    if (this.accountReceivablesHandling != null) {
+
+      formData.put("account_receivables_handling", this.accountReceivablesHandling);
+    }
+
+    if (this.refundableCreditsHandling != null) {
+
+      formData.put("refundable_credits_handling", this.refundableCreditsHandling);
+    }
+
+    if (this.contractTermCancelOption != null) {
+
+      formData.put("contract_term_cancel_option", this.contractTermCancelOption);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.cancelReasonCode != null) {
+
+      formData.put("cancel_reason_code", this.cancelReasonCode);
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EstimateCancelSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EstimateCancelSubscriptionBuilder builder() {
+    return new EstimateCancelSubscriptionBuilder();
+  }
+
+  public static final class EstimateCancelSubscriptionBuilder {
+
+    private CancelOption cancelOption;
+
+    private Boolean endOfTerm;
+
+    private Timestamp cancelAt;
+
+    private CreditOptionForCurrentTermCharges creditOptionForCurrentTermCharges;
+
+    private UnbilledChargesOption unbilledChargesOption;
+
+    private AccountReceivablesHandling accountReceivablesHandling;
+
+    private RefundableCreditsHandling refundableCreditsHandling;
+
+    private ContractTermCancelOption contractTermCancelOption;
+
+    private Timestamp invoiceDate;
+
+    private String cancelReasonCode;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private EstimateCancelSubscriptionBuilder() {}
+
+    public EstimateCancelSubscriptionBuilder cancelOption(CancelOption value) {
+      this.cancelOption = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionBuilder endOfTerm(Boolean value) {
+      this.endOfTerm = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionBuilder cancelAt(Timestamp value) {
+      this.cancelAt = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionBuilder creditOptionForCurrentTermCharges(
+        CreditOptionForCurrentTermCharges value) {
+      this.creditOptionForCurrentTermCharges = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionBuilder unbilledChargesOption(UnbilledChargesOption value) {
+      this.unbilledChargesOption = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionBuilder accountReceivablesHandling(
+        AccountReceivablesHandling value) {
+      this.accountReceivablesHandling = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionBuilder refundableCreditsHandling(
+        RefundableCreditsHandling value) {
+      this.refundableCreditsHandling = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionBuilder contractTermCancelOption(
+        ContractTermCancelOption value) {
+      this.contractTermCancelOption = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionBuilder cancelReasonCode(String value) {
+      this.cancelReasonCode = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public EstimateCancelSubscriptionParams build() {
+      return new EstimateCancelSubscriptionParams(this);
+    }
+  }
+
+  public enum CancelOption {
+    IMMEDIATELY("immediately"),
+
+    END_OF_TERM("end_of_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    END_OF_BILLING_TERM("end_of_billing_term"),
+
+    /** An enum member indicating that CancelOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CancelOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CancelOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CancelOption enumValue : CancelOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum CreditOptionForCurrentTermCharges {
+    NONE("none"),
+
+    PRORATE("prorate"),
+
+    FULL("full"),
+
+    /**
+     * An enum member indicating that CreditOptionForCurrentTermCharges was instantiated with an
+     * unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    CreditOptionForCurrentTermCharges(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CreditOptionForCurrentTermCharges fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CreditOptionForCurrentTermCharges enumValue :
+          CreditOptionForCurrentTermCharges.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum UnbilledChargesOption {
+    INVOICE("invoice"),
+
+    DELETE("delete"),
+
+    /**
+     * An enum member indicating that UnbilledChargesOption was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    UnbilledChargesOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static UnbilledChargesOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (UnbilledChargesOption enumValue : UnbilledChargesOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AccountReceivablesHandling {
+    NO_ACTION("no_action"),
+
+    SCHEDULE_PAYMENT_COLLECTION("schedule_payment_collection"),
+
+    WRITE_OFF("write_off"),
+
+    /**
+     * An enum member indicating that AccountReceivablesHandling was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    AccountReceivablesHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AccountReceivablesHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AccountReceivablesHandling enumValue : AccountReceivablesHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum RefundableCreditsHandling {
+    NO_ACTION("no_action"),
+
+    SCHEDULE_REFUND("schedule_refund"),
+
+    /**
+     * An enum member indicating that RefundableCreditsHandling was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    RefundableCreditsHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static RefundableCreditsHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (RefundableCreditsHandling enumValue : RefundableCreditsHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ContractTermCancelOption {
+    TERMINATE_IMMEDIATELY("terminate_immediately"),
+
+    END_OF_CONTRACT_TERM("end_of_contract_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    END_OF_SUBSCRIPTION_BILLING_TERM("end_of_subscription_billing_term"),
+
+    /**
+     * An enum member indicating that ContractTermCancelOption was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    ContractTermCancelOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ContractTermCancelOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ContractTermCancelOption enumValue : ContractTermCancelOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final Integer servicePeriodInDays;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private Integer servicePeriodInDays;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/EstimateChangeTermEndParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateChangeTermEndParams.java
new file mode 100644
index 00000000..8b2eaf67
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateChangeTermEndParams.java
@@ -0,0 +1,101 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class EstimateChangeTermEndParams {
+
+  private final Timestamp termEndsAt;
+
+  private final Boolean prorate;
+
+  private final Boolean invoiceImmediately;
+
+  private EstimateChangeTermEndParams(EstimateChangeTermEndBuilder builder) {
+
+    this.termEndsAt = builder.termEndsAt;
+
+    this.prorate = builder.prorate;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+  }
+
+  public Timestamp getTermEndsAt() {
+    return termEndsAt;
+  }
+
+  public Boolean getProrate() {
+    return prorate;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.termEndsAt != null) {
+
+      formData.put("term_ends_at", this.termEndsAt);
+    }
+
+    if (this.prorate != null) {
+
+      formData.put("prorate", this.prorate);
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EstimateChangeTermEndParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EstimateChangeTermEndBuilder builder() {
+    return new EstimateChangeTermEndBuilder();
+  }
+
+  public static final class EstimateChangeTermEndBuilder {
+
+    private Timestamp termEndsAt;
+
+    private Boolean prorate;
+
+    private Boolean invoiceImmediately;
+
+    private EstimateChangeTermEndBuilder() {}
+
+    public EstimateChangeTermEndBuilder termEndsAt(Timestamp value) {
+      this.termEndsAt = value;
+      return this;
+    }
+
+    public EstimateChangeTermEndBuilder prorate(Boolean value) {
+      this.prorate = value;
+      return this;
+    }
+
+    public EstimateChangeTermEndBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public EstimateChangeTermEndParams build() {
+      return new EstimateChangeTermEndParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCreateInvoiceForItemsParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCreateInvoiceForItemsParams.java
new file mode 100644
index 00000000..7e94be3c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCreateInvoiceForItemsParams.java
@@ -0,0 +1,2229 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EstimateCreateInvoiceForItemsParams {
+
+  private final String currencyCode;
+
+  private final String invoiceNote;
+
+  private final Boolean removeGeneralNote;
+
+  private final String coupon;
+
+  private final List<String> couponIds;
+
+  private final String authorizationTransactionId;
+
+  private final String paymentSourceId;
+
+  private final AutoCollection autoCollection;
+
+  private final Timestamp invoiceDate;
+
+  private final InvoiceParams invoice;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final BillingAddressParams billingAddress;
+
+  private final List<ItemPricesParams> itemPrices;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<ChargesParams> charges;
+
+  private final List<NotesToRemoveParams> notesToRemove;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private EstimateCreateInvoiceForItemsParams(EstimateCreateInvoiceForItemsBuilder builder) {
+
+    this.currencyCode = builder.currencyCode;
+
+    this.invoiceNote = builder.invoiceNote;
+
+    this.removeGeneralNote = builder.removeGeneralNote;
+
+    this.coupon = builder.coupon;
+
+    this.couponIds = builder.couponIds;
+
+    this.authorizationTransactionId = builder.authorizationTransactionId;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.invoice = builder.invoice;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.itemPrices = builder.itemPrices;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.charges = builder.charges;
+
+    this.notesToRemove = builder.notesToRemove;
+
+    this.discounts = builder.discounts;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getInvoiceNote() {
+    return invoiceNote;
+  }
+
+  public Boolean getRemoveGeneralNote() {
+    return removeGeneralNote;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getAuthorizationTransactionId() {
+    return authorizationTransactionId;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public InvoiceParams getInvoice() {
+    return invoice;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public List<ItemPricesParams> getItemPrices() {
+    return itemPrices;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<ChargesParams> getCharges() {
+    return charges;
+  }
+
+  public List<NotesToRemoveParams> getNotesToRemove() {
+    return notesToRemove;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.invoiceNote != null) {
+
+      formData.put("invoice_note", this.invoiceNote);
+    }
+
+    if (this.removeGeneralNote != null) {
+
+      formData.put("remove_general_note", this.removeGeneralNote);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.authorizationTransactionId != null) {
+
+      formData.put("authorization_transaction_id", this.authorizationTransactionId);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.invoice != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.invoice.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "invoice[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemPrices != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemPrices.size(); i++) {
+        ItemPricesParams item = this.itemPrices.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_prices[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.charges != null) {
+
+      // List of objects
+      for (int i = 0; i < this.charges.size(); i++) {
+        ChargesParams item = this.charges.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.notesToRemove != null) {
+
+      // List of objects
+      for (int i = 0; i < this.notesToRemove.size(); i++) {
+        NotesToRemoveParams item = this.notesToRemove.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "notes_to_remove[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EstimateCreateInvoiceForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EstimateCreateInvoiceForItemsBuilder builder() {
+    return new EstimateCreateInvoiceForItemsBuilder();
+  }
+
+  public static final class EstimateCreateInvoiceForItemsBuilder {
+
+    private String currencyCode;
+
+    private String invoiceNote;
+
+    private Boolean removeGeneralNote;
+
+    private String coupon;
+
+    private List<String> couponIds;
+
+    private String authorizationTransactionId;
+
+    private String paymentSourceId;
+
+    private AutoCollection autoCollection;
+
+    private Timestamp invoiceDate;
+
+    private InvoiceParams invoice;
+
+    private ShippingAddressParams shippingAddress;
+
+    private BillingAddressParams billingAddress;
+
+    private List<ItemPricesParams> itemPrices;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<ChargesParams> charges;
+
+    private List<NotesToRemoveParams> notesToRemove;
+
+    private List<DiscountsParams> discounts;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private EstimateCreateInvoiceForItemsBuilder() {}
+
+    public EstimateCreateInvoiceForItemsBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder invoiceNote(String value) {
+      this.invoiceNote = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder removeGeneralNote(Boolean value) {
+      this.removeGeneralNote = value;
+      return this;
+    }
+
+    @Deprecated
+    public EstimateCreateInvoiceForItemsBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder authorizationTransactionId(String value) {
+      this.authorizationTransactionId = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder invoice(InvoiceParams value) {
+      this.invoice = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder itemPrices(List<ItemPricesParams> value) {
+      this.itemPrices = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder charges(List<ChargesParams> value) {
+      this.charges = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder notesToRemove(List<NotesToRemoveParams> value) {
+      this.notesToRemove = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsBuilder taxProvidersFields(
+        List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceForItemsParams build() {
+      return new EstimateCreateInvoiceForItemsParams(this);
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class InvoiceParams {
+
+    private final String customerId;
+
+    private final String subscriptionId;
+
+    private final String poNumber;
+
+    private InvoiceParams(InvoiceBuilder builder) {
+
+      this.customerId = builder.customerId;
+
+      this.subscriptionId = builder.subscriptionId;
+
+      this.poNumber = builder.poNumber;
+    }
+
+    public String getCustomerId() {
+      return customerId;
+    }
+
+    public String getSubscriptionId() {
+      return subscriptionId;
+    }
+
+    public String getPoNumber() {
+      return poNumber;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.customerId != null) {
+
+        formData.put("customer_id", this.customerId);
+      }
+
+      if (this.subscriptionId != null) {
+
+        formData.put("subscription_id", this.subscriptionId);
+      }
+
+      if (this.poNumber != null) {
+
+        formData.put("po_number", this.poNumber);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceBuilder builder() {
+      return new InvoiceBuilder();
+    }
+
+    public static final class InvoiceBuilder {
+
+      private String customerId;
+
+      private String subscriptionId;
+
+      private String poNumber;
+
+      private InvoiceBuilder() {}
+
+      public InvoiceBuilder customerId(String value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public InvoiceBuilder subscriptionId(String value) {
+        this.subscriptionId = value;
+        return this;
+      }
+
+      public InvoiceBuilder poNumber(String value) {
+        this.poNumber = value;
+        return this;
+      }
+
+      public InvoiceParams build() {
+        return new InvoiceParams(this);
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemPricesParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ItemPricesParams(ItemPricesBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemPricesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemPricesBuilder builder() {
+      return new ItemPricesBuilder();
+    }
+
+    public static final class ItemPricesBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ItemPricesBuilder() {}
+
+      public ItemPricesBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemPricesBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public ItemPricesBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public ItemPricesBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public ItemPricesBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public ItemPricesBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ItemPricesBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ItemPricesParams build() {
+        return new ItemPricesParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChargesParams {
+
+    private final Long amount;
+
+    private final String amountInDecimal;
+
+    private final String description;
+
+    private final Boolean taxable;
+
+    private final String taxProfileId;
+
+    private final String avalaraTaxCode;
+
+    private final String hsnCode;
+
+    private final String taxjarProductCode;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ChargesParams(ChargesBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.description = builder.description;
+
+      this.taxable = builder.taxable;
+
+      this.taxProfileId = builder.taxProfileId;
+
+      this.avalaraTaxCode = builder.avalaraTaxCode;
+
+      this.hsnCode = builder.hsnCode;
+
+      this.taxjarProductCode = builder.taxjarProductCode;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Boolean getTaxable() {
+      return taxable;
+    }
+
+    public String getTaxProfileId() {
+      return taxProfileId;
+    }
+
+    public String getAvalaraTaxCode() {
+      return avalaraTaxCode;
+    }
+
+    public String getHsnCode() {
+      return hsnCode;
+    }
+
+    public String getTaxjarProductCode() {
+      return taxjarProductCode;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.taxable != null) {
+
+        formData.put("taxable", this.taxable);
+      }
+
+      if (this.taxProfileId != null) {
+
+        formData.put("tax_profile_id", this.taxProfileId);
+      }
+
+      if (this.avalaraTaxCode != null) {
+
+        formData.put("avalara_tax_code", this.avalaraTaxCode);
+      }
+
+      if (this.hsnCode != null) {
+
+        formData.put("hsn_code", this.hsnCode);
+      }
+
+      if (this.taxjarProductCode != null) {
+
+        formData.put("taxjar_product_code", this.taxjarProductCode);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargesBuilder builder() {
+      return new ChargesBuilder();
+    }
+
+    public static final class ChargesBuilder {
+
+      private Long amount;
+
+      private String amountInDecimal;
+
+      private String description;
+
+      private Boolean taxable;
+
+      private String taxProfileId;
+
+      private String avalaraTaxCode;
+
+      private String hsnCode;
+
+      private String taxjarProductCode;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ChargesBuilder() {}
+
+      public ChargesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public ChargesBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public ChargesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public ChargesBuilder taxable(Boolean value) {
+        this.taxable = value;
+        return this;
+      }
+
+      public ChargesBuilder taxProfileId(String value) {
+        this.taxProfileId = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTaxCode(String value) {
+        this.avalaraTaxCode = value;
+        return this;
+      }
+
+      public ChargesBuilder hsnCode(String value) {
+        this.hsnCode = value;
+        return this;
+      }
+
+      public ChargesBuilder taxjarProductCode(String value) {
+        this.taxjarProductCode = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public ChargesBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ChargesBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ChargesParams build() {
+        return new ChargesParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class NotesToRemoveParams {
+
+    private final EntityType entityType;
+
+    private final String entityId;
+
+    private NotesToRemoveParams(NotesToRemoveBuilder builder) {
+
+      this.entityType = builder.entityType;
+
+      this.entityId = builder.entityId;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NotesToRemoveParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NotesToRemoveBuilder builder() {
+      return new NotesToRemoveBuilder();
+    }
+
+    public static final class NotesToRemoveBuilder {
+
+      private EntityType entityType;
+
+      private String entityId;
+
+      private NotesToRemoveBuilder() {}
+
+      public NotesToRemoveBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public NotesToRemoveBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public NotesToRemoveParams build() {
+        return new NotesToRemoveParams(this);
+      }
+    }
+
+    public enum EntityType {
+      CUSTOMER("customer"),
+
+      SUBSCRIPTION("subscription"),
+
+      COUPON("coupon"),
+
+      PLAN_ITEM_PRICE("plan_item_price"),
+
+      ADDON_ITEM_PRICE("addon_item_price"),
+
+      CHARGE_ITEM_PRICE("charge_item_price"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer quantity;
+
+    private final ApplyOn applyOn;
+
+    private final String itemPriceId;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.quantity = builder.quantity;
+
+      this.applyOn = builder.applyOn;
+
+      this.itemPriceId = builder.itemPriceId;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer quantity;
+
+      private ApplyOn applyOn;
+
+      private String itemPriceId;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCreateInvoiceParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCreateInvoiceParams.java
new file mode 100644
index 00000000..52909e88
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCreateInvoiceParams.java
@@ -0,0 +1,1527 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EstimateCreateInvoiceParams {
+
+  private final String currencyCode;
+
+  private final String invoiceNote;
+
+  private final Boolean removeGeneralNote;
+
+  private final String coupon;
+
+  private final List<String> couponIds;
+
+  private final String authorizationTransactionId;
+
+  private final String paymentSourceId;
+
+  private final AutoCollection autoCollection;
+
+  private final Timestamp invoiceDate;
+
+  private final InvoiceParams invoice;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<AddonsParams> addons;
+
+  private final List<ChargesParams> charges;
+
+  private final List<NotesToRemoveParams> notesToRemove;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private EstimateCreateInvoiceParams(EstimateCreateInvoiceBuilder builder) {
+
+    this.currencyCode = builder.currencyCode;
+
+    this.invoiceNote = builder.invoiceNote;
+
+    this.removeGeneralNote = builder.removeGeneralNote;
+
+    this.coupon = builder.coupon;
+
+    this.couponIds = builder.couponIds;
+
+    this.authorizationTransactionId = builder.authorizationTransactionId;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.invoice = builder.invoice;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.addons = builder.addons;
+
+    this.charges = builder.charges;
+
+    this.notesToRemove = builder.notesToRemove;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getInvoiceNote() {
+    return invoiceNote;
+  }
+
+  public Boolean getRemoveGeneralNote() {
+    return removeGeneralNote;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getAuthorizationTransactionId() {
+    return authorizationTransactionId;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public InvoiceParams getInvoice() {
+    return invoice;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<ChargesParams> getCharges() {
+    return charges;
+  }
+
+  public List<NotesToRemoveParams> getNotesToRemove() {
+    return notesToRemove;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.invoiceNote != null) {
+
+      formData.put("invoice_note", this.invoiceNote);
+    }
+
+    if (this.removeGeneralNote != null) {
+
+      formData.put("remove_general_note", this.removeGeneralNote);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.authorizationTransactionId != null) {
+
+      formData.put("authorization_transaction_id", this.authorizationTransactionId);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.invoice != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.invoice.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "invoice[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.charges != null) {
+
+      // List of objects
+      for (int i = 0; i < this.charges.size(); i++) {
+        ChargesParams item = this.charges.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.notesToRemove != null) {
+
+      // List of objects
+      for (int i = 0; i < this.notesToRemove.size(); i++) {
+        NotesToRemoveParams item = this.notesToRemove.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "notes_to_remove[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EstimateCreateInvoiceParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EstimateCreateInvoiceBuilder builder() {
+    return new EstimateCreateInvoiceBuilder();
+  }
+
+  public static final class EstimateCreateInvoiceBuilder {
+
+    private String currencyCode;
+
+    private String invoiceNote;
+
+    private Boolean removeGeneralNote;
+
+    private String coupon;
+
+    private List<String> couponIds;
+
+    private String authorizationTransactionId;
+
+    private String paymentSourceId;
+
+    private AutoCollection autoCollection;
+
+    private Timestamp invoiceDate;
+
+    private InvoiceParams invoice;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<AddonsParams> addons;
+
+    private List<ChargesParams> charges;
+
+    private List<NotesToRemoveParams> notesToRemove;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private EstimateCreateInvoiceBuilder() {}
+
+    public EstimateCreateInvoiceBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceBuilder invoiceNote(String value) {
+      this.invoiceNote = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceBuilder removeGeneralNote(Boolean value) {
+      this.removeGeneralNote = value;
+      return this;
+    }
+
+    @Deprecated
+    public EstimateCreateInvoiceBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceBuilder authorizationTransactionId(String value) {
+      this.authorizationTransactionId = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceBuilder invoice(InvoiceParams value) {
+      this.invoice = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceBuilder charges(List<ChargesParams> value) {
+      this.charges = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceBuilder notesToRemove(List<NotesToRemoveParams> value) {
+      this.notesToRemove = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public EstimateCreateInvoiceParams build() {
+      return new EstimateCreateInvoiceParams(this);
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class InvoiceParams {
+
+    private final String customerId;
+
+    private final String subscriptionId;
+
+    private final String poNumber;
+
+    private InvoiceParams(InvoiceBuilder builder) {
+
+      this.customerId = builder.customerId;
+
+      this.subscriptionId = builder.subscriptionId;
+
+      this.poNumber = builder.poNumber;
+    }
+
+    public String getCustomerId() {
+      return customerId;
+    }
+
+    public String getSubscriptionId() {
+      return subscriptionId;
+    }
+
+    public String getPoNumber() {
+      return poNumber;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.customerId != null) {
+
+        formData.put("customer_id", this.customerId);
+      }
+
+      if (this.subscriptionId != null) {
+
+        formData.put("subscription_id", this.subscriptionId);
+      }
+
+      if (this.poNumber != null) {
+
+        formData.put("po_number", this.poNumber);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceBuilder builder() {
+      return new InvoiceBuilder();
+    }
+
+    public static final class InvoiceBuilder {
+
+      private String customerId;
+
+      private String subscriptionId;
+
+      private String poNumber;
+
+      private InvoiceBuilder() {}
+
+      public InvoiceBuilder customerId(String value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public InvoiceBuilder subscriptionId(String value) {
+        this.subscriptionId = value;
+        return this;
+      }
+
+      public InvoiceBuilder poNumber(String value) {
+        this.poNumber = value;
+        return this;
+      }
+
+      public InvoiceParams build() {
+        return new InvoiceParams(this);
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public AddonsBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class ChargesParams {
+
+    private final Long amount;
+
+    private final String amountInDecimal;
+
+    private final String description;
+
+    private final Boolean taxable;
+
+    private final String taxProfileId;
+
+    private final String avalaraTaxCode;
+
+    private final String hsnCode;
+
+    private final String taxjarProductCode;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ChargesParams(ChargesBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.description = builder.description;
+
+      this.taxable = builder.taxable;
+
+      this.taxProfileId = builder.taxProfileId;
+
+      this.avalaraTaxCode = builder.avalaraTaxCode;
+
+      this.hsnCode = builder.hsnCode;
+
+      this.taxjarProductCode = builder.taxjarProductCode;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Boolean getTaxable() {
+      return taxable;
+    }
+
+    public String getTaxProfileId() {
+      return taxProfileId;
+    }
+
+    public String getAvalaraTaxCode() {
+      return avalaraTaxCode;
+    }
+
+    public String getHsnCode() {
+      return hsnCode;
+    }
+
+    public String getTaxjarProductCode() {
+      return taxjarProductCode;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.taxable != null) {
+
+        formData.put("taxable", this.taxable);
+      }
+
+      if (this.taxProfileId != null) {
+
+        formData.put("tax_profile_id", this.taxProfileId);
+      }
+
+      if (this.avalaraTaxCode != null) {
+
+        formData.put("avalara_tax_code", this.avalaraTaxCode);
+      }
+
+      if (this.hsnCode != null) {
+
+        formData.put("hsn_code", this.hsnCode);
+      }
+
+      if (this.taxjarProductCode != null) {
+
+        formData.put("taxjar_product_code", this.taxjarProductCode);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargesBuilder builder() {
+      return new ChargesBuilder();
+    }
+
+    public static final class ChargesBuilder {
+
+      private Long amount;
+
+      private String amountInDecimal;
+
+      private String description;
+
+      private Boolean taxable;
+
+      private String taxProfileId;
+
+      private String avalaraTaxCode;
+
+      private String hsnCode;
+
+      private String taxjarProductCode;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ChargesBuilder() {}
+
+      public ChargesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public ChargesBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public ChargesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public ChargesBuilder taxable(Boolean value) {
+        this.taxable = value;
+        return this;
+      }
+
+      public ChargesBuilder taxProfileId(String value) {
+        this.taxProfileId = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTaxCode(String value) {
+        this.avalaraTaxCode = value;
+        return this;
+      }
+
+      public ChargesBuilder hsnCode(String value) {
+        this.hsnCode = value;
+        return this;
+      }
+
+      public ChargesBuilder taxjarProductCode(String value) {
+        this.taxjarProductCode = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public ChargesBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ChargesBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ChargesParams build() {
+        return new ChargesParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class NotesToRemoveParams {
+
+    private final EntityType entityType;
+
+    private final String entityId;
+
+    private NotesToRemoveParams(NotesToRemoveBuilder builder) {
+
+      this.entityType = builder.entityType;
+
+      this.entityId = builder.entityId;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NotesToRemoveParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NotesToRemoveBuilder builder() {
+      return new NotesToRemoveBuilder();
+    }
+
+    public static final class NotesToRemoveBuilder {
+
+      private EntityType entityType;
+
+      private String entityId;
+
+      private NotesToRemoveBuilder() {}
+
+      public NotesToRemoveBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public NotesToRemoveBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public NotesToRemoveParams build() {
+        return new NotesToRemoveParams(this);
+      }
+    }
+
+    public enum EntityType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CUSTOMER("customer"),
+
+      SUBSCRIPTION("subscription"),
+
+      COUPON("coupon"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCreateSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCreateSubscriptionParams.java
new file mode 100644
index 00000000..854c80c8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateCreateSubscriptionParams.java
@@ -0,0 +1,2269 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EstimateCreateSubscriptionParams {
+
+  private final Integer billingCycles;
+
+  private final List<String> mandatoryAddonsToRemove;
+
+  private final Integer termsToCharge;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final Boolean invoiceImmediately;
+
+  private final Timestamp invoiceDate;
+
+  private final String clientProfileId;
+
+  private final SubscriptionParams subscription;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final CustomerParams customer;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<AddonsParams> addons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private EstimateCreateSubscriptionParams(EstimateCreateSubscriptionBuilder builder) {
+
+    this.billingCycles = builder.billingCycles;
+
+    this.mandatoryAddonsToRemove = builder.mandatoryAddonsToRemove;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.clientProfileId = builder.clientProfileId;
+
+    this.subscription = builder.subscription;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.customer = builder.customer;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.addons = builder.addons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public List<String> getMandatoryAddonsToRemove() {
+    return mandatoryAddonsToRemove;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public String getClientProfileId() {
+    return clientProfileId;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.mandatoryAddonsToRemove != null) {
+
+      formData.put("mandatory_addons_to_remove", this.mandatoryAddonsToRemove);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.clientProfileId != null) {
+
+      formData.put("client_profile_id", this.clientProfileId);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EstimateCreateSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EstimateCreateSubscriptionBuilder builder() {
+    return new EstimateCreateSubscriptionBuilder();
+  }
+
+  public static final class EstimateCreateSubscriptionBuilder {
+
+    private Integer billingCycles;
+
+    private List<String> mandatoryAddonsToRemove;
+
+    private Integer termsToCharge;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private Boolean invoiceImmediately;
+
+    private Timestamp invoiceDate;
+
+    private String clientProfileId;
+
+    private SubscriptionParams subscription;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private CustomerParams customer;
+
+    private ContractTermParams contractTerm;
+
+    private List<AddonsParams> addons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private EstimateCreateSubscriptionBuilder() {}
+
+    public EstimateCreateSubscriptionBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder mandatoryAddonsToRemove(List<String> value) {
+      this.mandatoryAddonsToRemove = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder clientProfileId(String value) {
+      this.clientProfileId = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionBuilder taxProvidersFields(
+        List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public EstimateCreateSubscriptionParams build() {
+      return new EstimateCreateSubscriptionParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final String planId;
+
+    private final Integer planQuantity;
+
+    private final String planQuantityInDecimal;
+
+    private final Long planUnitPrice;
+
+    private final String planUnitPriceInDecimal;
+
+    private final Long setupFee;
+
+    private final Timestamp trialEnd;
+
+    private final Timestamp startDate;
+
+    private final String coupon;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Integer freePeriod;
+
+    private final FreePeriodUnit freePeriodUnit;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private final TrialEndAction trialEndAction;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.planId = builder.planId;
+
+      this.planQuantity = builder.planQuantity;
+
+      this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+      this.planUnitPrice = builder.planUnitPrice;
+
+      this.planUnitPriceInDecimal = builder.planUnitPriceInDecimal;
+
+      this.setupFee = builder.setupFee;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.startDate = builder.startDate;
+
+      this.coupon = builder.coupon;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.freePeriod = builder.freePeriod;
+
+      this.freePeriodUnit = builder.freePeriodUnit;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+      this.trialEndAction = builder.trialEndAction;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getPlanId() {
+      return planId;
+    }
+
+    public Integer getPlanQuantity() {
+      return planQuantity;
+    }
+
+    public String getPlanQuantityInDecimal() {
+      return planQuantityInDecimal;
+    }
+
+    public Long getPlanUnitPrice() {
+      return planUnitPrice;
+    }
+
+    public String getPlanUnitPriceInDecimal() {
+      return planUnitPriceInDecimal;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public String getCoupon() {
+      return coupon;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Integer getFreePeriod() {
+      return freePeriod;
+    }
+
+    public FreePeriodUnit getFreePeriodUnit() {
+      return freePeriodUnit;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    public TrialEndAction getTrialEndAction() {
+      return trialEndAction;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.planId != null) {
+
+        formData.put("plan_id", this.planId);
+      }
+
+      if (this.planQuantity != null) {
+
+        formData.put("plan_quantity", this.planQuantity);
+      }
+
+      if (this.planQuantityInDecimal != null) {
+
+        formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+      }
+
+      if (this.planUnitPrice != null) {
+
+        formData.put("plan_unit_price", this.planUnitPrice);
+      }
+
+      if (this.planUnitPriceInDecimal != null) {
+
+        formData.put("plan_unit_price_in_decimal", this.planUnitPriceInDecimal);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.coupon != null) {
+
+        formData.put("coupon", this.coupon);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.freePeriod != null) {
+
+        formData.put("free_period", this.freePeriod);
+      }
+
+      if (this.freePeriodUnit != null) {
+
+        formData.put("free_period_unit", this.freePeriodUnit);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      if (this.trialEndAction != null) {
+
+        formData.put("trial_end_action", this.trialEndAction);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private String planId;
+
+      private Integer planQuantity;
+
+      private String planQuantityInDecimal;
+
+      private Long planUnitPrice;
+
+      private String planUnitPriceInDecimal;
+
+      private Long setupFee;
+
+      private Timestamp trialEnd;
+
+      private Timestamp startDate;
+
+      private String coupon;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Integer freePeriod;
+
+      private FreePeriodUnit freePeriodUnit;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private TrialEndAction trialEndAction;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planId(String value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantity(Integer value) {
+        this.planQuantity = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantityInDecimal(String value) {
+        this.planQuantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPrice(Long value) {
+        this.planUnitPrice = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
+        this.planUnitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder coupon(String value) {
+        this.coupon = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder freePeriod(Integer value) {
+        this.freePeriod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder freePeriodUnit(FreePeriodUnit value) {
+        this.freePeriodUnit = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEndAction(TrialEndAction value) {
+        this.trialEndAction = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum FreePeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      FreePeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static FreePeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum TrialEndAction {
+      SITE_DEFAULT("site_default"),
+
+      PLAN_DEFAULT("plan_default"),
+
+      ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+      CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+      /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      TrialEndAction(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static TrialEndAction fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (TrialEndAction enumValue : TrialEndAction.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final Boolean registeredForGst;
+
+    private final Taxability taxability;
+
+    private final EntityCode entityCode;
+
+    private final String exemptNumber;
+
+    private final List<Object> exemptionDetails;
+
+    private final CustomerType customerType;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.registeredForGst = builder.registeredForGst;
+
+      this.taxability = builder.taxability;
+
+      this.entityCode = builder.entityCode;
+
+      this.exemptNumber = builder.exemptNumber;
+
+      this.exemptionDetails = builder.exemptionDetails;
+
+      this.customerType = builder.customerType;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public Boolean getRegisteredForGst() {
+      return registeredForGst;
+    }
+
+    public Taxability getTaxability() {
+      return taxability;
+    }
+
+    public EntityCode getEntityCode() {
+      return entityCode;
+    }
+
+    public String getExemptNumber() {
+      return exemptNumber;
+    }
+
+    public List<Object> getExemptionDetails() {
+      return exemptionDetails;
+    }
+
+    public CustomerType getCustomerType() {
+      return customerType;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.registeredForGst != null) {
+
+        formData.put("registered_for_gst", this.registeredForGst);
+      }
+
+      if (this.taxability != null) {
+
+        formData.put("taxability", this.taxability);
+      }
+
+      if (this.entityCode != null) {
+
+        formData.put("entity_code", this.entityCode);
+      }
+
+      if (this.exemptNumber != null) {
+
+        formData.put("exempt_number", this.exemptNumber);
+      }
+
+      if (this.exemptionDetails != null) {
+
+        formData.put("exemption_details", JsonUtil.toJson(this.exemptionDetails));
+      }
+
+      if (this.customerType != null) {
+
+        formData.put("customer_type", this.customerType);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private Boolean registeredForGst;
+
+      private Taxability taxability;
+
+      private EntityCode entityCode;
+
+      private String exemptNumber;
+
+      private List<Object> exemptionDetails;
+
+      private CustomerType customerType;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder registeredForGst(Boolean value) {
+        this.registeredForGst = value;
+        return this;
+      }
+
+      public CustomerBuilder taxability(Taxability value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerBuilder entityCode(EntityCode value) {
+        this.entityCode = value;
+        return this;
+      }
+
+      public CustomerBuilder exemptNumber(String value) {
+        this.exemptNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder exemptionDetails(List<Object> value) {
+        this.exemptionDetails = value;
+        return this;
+      }
+
+      public CustomerBuilder customerType(CustomerType value) {
+        this.customerType = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+
+    public enum Taxability {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Taxability was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Taxability(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Taxability fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Taxability enumValue : Taxability.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum EntityCode {
+      A("a"),
+
+      B("b"),
+
+      C("c"),
+
+      D("d"),
+
+      E("e"),
+
+      F("f"),
+
+      G("g"),
+
+      H("h"),
+
+      I("i"),
+
+      J("j"),
+
+      K("k"),
+
+      L("l"),
+
+      M("m"),
+
+      N("n"),
+
+      P("p"),
+
+      Q("q"),
+
+      R("r"),
+
+      MED_1("med1"),
+
+      MED_2("med2"),
+
+      /** An enum member indicating that EntityCode was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityCode(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityCode fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityCode enumValue : EntityCode.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum CustomerType {
+      RESIDENTIAL("residential"),
+
+      BUSINESS("business"),
+
+      SENIOR_CITIZEN("senior_citizen"),
+
+      INDUSTRIAL("industrial"),
+
+      /** An enum member indicating that CustomerType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      CustomerType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static CustomerType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (CustomerType enumValue : CustomerType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AddonsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriodInDays;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOn chargeOn;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOn = builder.chargeOn;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOn getChargeOn() {
+      return chargeOn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOn != null) {
+
+        formData.put("charge_on", this.chargeOn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriodInDays;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOn chargeOn;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
+        this.chargeOn = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOn {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOn enumValue : ChargeOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/EstimateGiftSubscriptionForItemsParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateGiftSubscriptionForItemsParams.java
new file mode 100644
index 00000000..f9640a0b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateGiftSubscriptionForItemsParams.java
@@ -0,0 +1,1456 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EstimateGiftSubscriptionForItemsParams {
+
+  private final List<String> couponIds;
+
+  private final GiftParams gift;
+
+  private final GifterParams gifter;
+
+  private final GiftReceiverParams giftReceiver;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private EstimateGiftSubscriptionForItemsParams(EstimateGiftSubscriptionForItemsBuilder builder) {
+
+    this.couponIds = builder.couponIds;
+
+    this.gift = builder.gift;
+
+    this.gifter = builder.gifter;
+
+    this.giftReceiver = builder.giftReceiver;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.itemTiers = builder.itemTiers;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public GiftParams getGift() {
+    return gift;
+  }
+
+  public GifterParams getGifter() {
+    return gifter;
+  }
+
+  public GiftReceiverParams getGiftReceiver() {
+    return giftReceiver;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.gift != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.gift.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "gift[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.gifter != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.gifter.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "gifter[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.giftReceiver != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.giftReceiver.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "gift_receiver[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EstimateGiftSubscriptionForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EstimateGiftSubscriptionForItemsBuilder builder() {
+    return new EstimateGiftSubscriptionForItemsBuilder();
+  }
+
+  public static final class EstimateGiftSubscriptionForItemsBuilder {
+
+    private List<String> couponIds;
+
+    private GiftParams gift;
+
+    private GifterParams gifter;
+
+    private GiftReceiverParams giftReceiver;
+
+    private PaymentIntentParams paymentIntent;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private EstimateGiftSubscriptionForItemsBuilder() {}
+
+    public EstimateGiftSubscriptionForItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionForItemsBuilder gift(GiftParams value) {
+      this.gift = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionForItemsBuilder gifter(GifterParams value) {
+      this.gifter = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionForItemsBuilder giftReceiver(GiftReceiverParams value) {
+      this.giftReceiver = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionForItemsBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionForItemsBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionForItemsBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionForItemsBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionForItemsParams build() {
+      return new EstimateGiftSubscriptionForItemsParams(this);
+    }
+  }
+
+  public static final class GiftParams {
+
+    private final Timestamp scheduledAt;
+
+    private final Boolean autoClaim;
+
+    private final Boolean noExpiry;
+
+    private final Timestamp claimExpiryDate;
+
+    private GiftParams(GiftBuilder builder) {
+
+      this.scheduledAt = builder.scheduledAt;
+
+      this.autoClaim = builder.autoClaim;
+
+      this.noExpiry = builder.noExpiry;
+
+      this.claimExpiryDate = builder.claimExpiryDate;
+    }
+
+    public Timestamp getScheduledAt() {
+      return scheduledAt;
+    }
+
+    public Boolean getAutoClaim() {
+      return autoClaim;
+    }
+
+    public Boolean getNoExpiry() {
+      return noExpiry;
+    }
+
+    public Timestamp getClaimExpiryDate() {
+      return claimExpiryDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.scheduledAt != null) {
+
+        formData.put("scheduled_at", this.scheduledAt);
+      }
+
+      if (this.autoClaim != null) {
+
+        formData.put("auto_claim", this.autoClaim);
+      }
+
+      if (this.noExpiry != null) {
+
+        formData.put("no_expiry", this.noExpiry);
+      }
+
+      if (this.claimExpiryDate != null) {
+
+        formData.put("claim_expiry_date", this.claimExpiryDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GiftParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GiftBuilder builder() {
+      return new GiftBuilder();
+    }
+
+    public static final class GiftBuilder {
+
+      private Timestamp scheduledAt;
+
+      private Boolean autoClaim;
+
+      private Boolean noExpiry;
+
+      private Timestamp claimExpiryDate;
+
+      private GiftBuilder() {}
+
+      public GiftBuilder scheduledAt(Timestamp value) {
+        this.scheduledAt = value;
+        return this;
+      }
+
+      public GiftBuilder autoClaim(Boolean value) {
+        this.autoClaim = value;
+        return this;
+      }
+
+      public GiftBuilder noExpiry(Boolean value) {
+        this.noExpiry = value;
+        return this;
+      }
+
+      public GiftBuilder claimExpiryDate(Timestamp value) {
+        this.claimExpiryDate = value;
+        return this;
+      }
+
+      public GiftParams build() {
+        return new GiftParams(this);
+      }
+    }
+  }
+
+  public static final class GifterParams {
+
+    private final String customerId;
+
+    private final String signature;
+
+    private final String note;
+
+    private final String paymentSrcId;
+
+    private GifterParams(GifterBuilder builder) {
+
+      this.customerId = builder.customerId;
+
+      this.signature = builder.signature;
+
+      this.note = builder.note;
+
+      this.paymentSrcId = builder.paymentSrcId;
+    }
+
+    public String getCustomerId() {
+      return customerId;
+    }
+
+    public String getSignature() {
+      return signature;
+    }
+
+    public String getNote() {
+      return note;
+    }
+
+    public String getPaymentSrcId() {
+      return paymentSrcId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.customerId != null) {
+
+        formData.put("customer_id", this.customerId);
+      }
+
+      if (this.signature != null) {
+
+        formData.put("signature", this.signature);
+      }
+
+      if (this.note != null) {
+
+        formData.put("note", this.note);
+      }
+
+      if (this.paymentSrcId != null) {
+
+        formData.put("payment_src_id", this.paymentSrcId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GifterParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GifterBuilder builder() {
+      return new GifterBuilder();
+    }
+
+    public static final class GifterBuilder {
+
+      private String customerId;
+
+      private String signature;
+
+      private String note;
+
+      private String paymentSrcId;
+
+      private GifterBuilder() {}
+
+      public GifterBuilder customerId(String value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public GifterBuilder signature(String value) {
+        this.signature = value;
+        return this;
+      }
+
+      public GifterBuilder note(String value) {
+        this.note = value;
+        return this;
+      }
+
+      public GifterBuilder paymentSrcId(String value) {
+        this.paymentSrcId = value;
+        return this;
+      }
+
+      public GifterParams build() {
+        return new GifterParams(this);
+      }
+    }
+  }
+
+  public static final class GiftReceiverParams {
+
+    private final String customerId;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private GiftReceiverParams(GiftReceiverBuilder builder) {
+
+      this.customerId = builder.customerId;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+    }
+
+    public String getCustomerId() {
+      return customerId;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.customerId != null) {
+
+        formData.put("customer_id", this.customerId);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GiftReceiverParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GiftReceiverBuilder builder() {
+      return new GiftReceiverBuilder();
+    }
+
+    public static final class GiftReceiverBuilder {
+
+      private String customerId;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private GiftReceiverBuilder() {}
+
+      public GiftReceiverBuilder customerId(String value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public GiftReceiverBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public GiftReceiverBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public GiftReceiverBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public GiftReceiverParams build() {
+        return new GiftReceiverParams(this);
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/EstimateGiftSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateGiftSubscriptionParams.java
new file mode 100644
index 00000000..1f8896fa
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateGiftSubscriptionParams.java
@@ -0,0 +1,1330 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EstimateGiftSubscriptionParams {
+
+  private final List<String> couponIds;
+
+  private final GiftParams gift;
+
+  private final GifterParams gifter;
+
+  private final GiftReceiverParams giftReceiver;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final SubscriptionParams subscription;
+
+  private final List<AddonsParams> addons;
+
+  private EstimateGiftSubscriptionParams(EstimateGiftSubscriptionBuilder builder) {
+
+    this.couponIds = builder.couponIds;
+
+    this.gift = builder.gift;
+
+    this.gifter = builder.gifter;
+
+    this.giftReceiver = builder.giftReceiver;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.subscription = builder.subscription;
+
+    this.addons = builder.addons;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public GiftParams getGift() {
+    return gift;
+  }
+
+  public GifterParams getGifter() {
+    return gifter;
+  }
+
+  public GiftReceiverParams getGiftReceiver() {
+    return giftReceiver;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.gift != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.gift.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "gift[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.gifter != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.gifter.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "gifter[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.giftReceiver != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.giftReceiver.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "gift_receiver[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EstimateGiftSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EstimateGiftSubscriptionBuilder builder() {
+    return new EstimateGiftSubscriptionBuilder();
+  }
+
+  public static final class EstimateGiftSubscriptionBuilder {
+
+    private List<String> couponIds;
+
+    private GiftParams gift;
+
+    private GifterParams gifter;
+
+    private GiftReceiverParams giftReceiver;
+
+    private PaymentIntentParams paymentIntent;
+
+    private ShippingAddressParams shippingAddress;
+
+    private SubscriptionParams subscription;
+
+    private List<AddonsParams> addons;
+
+    private EstimateGiftSubscriptionBuilder() {}
+
+    public EstimateGiftSubscriptionBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionBuilder gift(GiftParams value) {
+      this.gift = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionBuilder gifter(GifterParams value) {
+      this.gifter = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionBuilder giftReceiver(GiftReceiverParams value) {
+      this.giftReceiver = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public EstimateGiftSubscriptionParams build() {
+      return new EstimateGiftSubscriptionParams(this);
+    }
+  }
+
+  public static final class GiftParams {
+
+    private final Timestamp scheduledAt;
+
+    private final Boolean autoClaim;
+
+    private final Boolean noExpiry;
+
+    private final Timestamp claimExpiryDate;
+
+    private GiftParams(GiftBuilder builder) {
+
+      this.scheduledAt = builder.scheduledAt;
+
+      this.autoClaim = builder.autoClaim;
+
+      this.noExpiry = builder.noExpiry;
+
+      this.claimExpiryDate = builder.claimExpiryDate;
+    }
+
+    public Timestamp getScheduledAt() {
+      return scheduledAt;
+    }
+
+    public Boolean getAutoClaim() {
+      return autoClaim;
+    }
+
+    public Boolean getNoExpiry() {
+      return noExpiry;
+    }
+
+    public Timestamp getClaimExpiryDate() {
+      return claimExpiryDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.scheduledAt != null) {
+
+        formData.put("scheduled_at", this.scheduledAt);
+      }
+
+      if (this.autoClaim != null) {
+
+        formData.put("auto_claim", this.autoClaim);
+      }
+
+      if (this.noExpiry != null) {
+
+        formData.put("no_expiry", this.noExpiry);
+      }
+
+      if (this.claimExpiryDate != null) {
+
+        formData.put("claim_expiry_date", this.claimExpiryDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GiftParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GiftBuilder builder() {
+      return new GiftBuilder();
+    }
+
+    public static final class GiftBuilder {
+
+      private Timestamp scheduledAt;
+
+      private Boolean autoClaim;
+
+      private Boolean noExpiry;
+
+      private Timestamp claimExpiryDate;
+
+      private GiftBuilder() {}
+
+      public GiftBuilder scheduledAt(Timestamp value) {
+        this.scheduledAt = value;
+        return this;
+      }
+
+      public GiftBuilder autoClaim(Boolean value) {
+        this.autoClaim = value;
+        return this;
+      }
+
+      public GiftBuilder noExpiry(Boolean value) {
+        this.noExpiry = value;
+        return this;
+      }
+
+      public GiftBuilder claimExpiryDate(Timestamp value) {
+        this.claimExpiryDate = value;
+        return this;
+      }
+
+      public GiftParams build() {
+        return new GiftParams(this);
+      }
+    }
+  }
+
+  public static final class GifterParams {
+
+    private final String customerId;
+
+    private final String signature;
+
+    private final String note;
+
+    private final String paymentSrcId;
+
+    private GifterParams(GifterBuilder builder) {
+
+      this.customerId = builder.customerId;
+
+      this.signature = builder.signature;
+
+      this.note = builder.note;
+
+      this.paymentSrcId = builder.paymentSrcId;
+    }
+
+    public String getCustomerId() {
+      return customerId;
+    }
+
+    public String getSignature() {
+      return signature;
+    }
+
+    public String getNote() {
+      return note;
+    }
+
+    public String getPaymentSrcId() {
+      return paymentSrcId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.customerId != null) {
+
+        formData.put("customer_id", this.customerId);
+      }
+
+      if (this.signature != null) {
+
+        formData.put("signature", this.signature);
+      }
+
+      if (this.note != null) {
+
+        formData.put("note", this.note);
+      }
+
+      if (this.paymentSrcId != null) {
+
+        formData.put("payment_src_id", this.paymentSrcId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GifterParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GifterBuilder builder() {
+      return new GifterBuilder();
+    }
+
+    public static final class GifterBuilder {
+
+      private String customerId;
+
+      private String signature;
+
+      private String note;
+
+      private String paymentSrcId;
+
+      private GifterBuilder() {}
+
+      public GifterBuilder customerId(String value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public GifterBuilder signature(String value) {
+        this.signature = value;
+        return this;
+      }
+
+      public GifterBuilder note(String value) {
+        this.note = value;
+        return this;
+      }
+
+      public GifterBuilder paymentSrcId(String value) {
+        this.paymentSrcId = value;
+        return this;
+      }
+
+      public GifterParams build() {
+        return new GifterParams(this);
+      }
+    }
+  }
+
+  public static final class GiftReceiverParams {
+
+    private final String customerId;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private GiftReceiverParams(GiftReceiverBuilder builder) {
+
+      this.customerId = builder.customerId;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+    }
+
+    public String getCustomerId() {
+      return customerId;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.customerId != null) {
+
+        formData.put("customer_id", this.customerId);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GiftReceiverParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GiftReceiverBuilder builder() {
+      return new GiftReceiverBuilder();
+    }
+
+    public static final class GiftReceiverBuilder {
+
+      private String customerId;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private GiftReceiverBuilder() {}
+
+      public GiftReceiverBuilder customerId(String value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public GiftReceiverBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public GiftReceiverBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public GiftReceiverBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public GiftReceiverParams build() {
+        return new GiftReceiverParams(this);
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String planId;
+
+    private final Integer planQuantity;
+
+    private final String planQuantityInDecimal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.planId = builder.planId;
+
+      this.planQuantity = builder.planQuantity;
+
+      this.planQuantityInDecimal = builder.planQuantityInDecimal;
+    }
+
+    public String getPlanId() {
+      return planId;
+    }
+
+    public Integer getPlanQuantity() {
+      return planQuantity;
+    }
+
+    public String getPlanQuantityInDecimal() {
+      return planQuantityInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.planId != null) {
+
+        formData.put("plan_id", this.planId);
+      }
+
+      if (this.planQuantity != null) {
+
+        formData.put("plan_quantity", this.planQuantity);
+      }
+
+      if (this.planQuantityInDecimal != null) {
+
+        formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String planId;
+
+      private Integer planQuantity;
+
+      private String planQuantityInDecimal;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder planId(String value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantity(Integer value) {
+        this.planQuantity = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantityInDecimal(String value) {
+        this.planQuantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/EstimatePauseSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/EstimatePauseSubscriptionParams.java
new file mode 100644
index 00000000..2b463d6d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/EstimatePauseSubscriptionParams.java
@@ -0,0 +1,257 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class EstimatePauseSubscriptionParams {
+
+  private final PauseOption pauseOption;
+
+  private final UnbilledChargesHandling unbilledChargesHandling;
+
+  private final SubscriptionParams subscription;
+
+  private EstimatePauseSubscriptionParams(EstimatePauseSubscriptionBuilder builder) {
+
+    this.pauseOption = builder.pauseOption;
+
+    this.unbilledChargesHandling = builder.unbilledChargesHandling;
+
+    this.subscription = builder.subscription;
+  }
+
+  public PauseOption getPauseOption() {
+    return pauseOption;
+  }
+
+  public UnbilledChargesHandling getUnbilledChargesHandling() {
+    return unbilledChargesHandling;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.pauseOption != null) {
+
+      formData.put("pause_option", this.pauseOption);
+    }
+
+    if (this.unbilledChargesHandling != null) {
+
+      formData.put("unbilled_charges_handling", this.unbilledChargesHandling);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EstimatePauseSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EstimatePauseSubscriptionBuilder builder() {
+    return new EstimatePauseSubscriptionBuilder();
+  }
+
+  public static final class EstimatePauseSubscriptionBuilder {
+
+    private PauseOption pauseOption;
+
+    private UnbilledChargesHandling unbilledChargesHandling;
+
+    private SubscriptionParams subscription;
+
+    private EstimatePauseSubscriptionBuilder() {}
+
+    public EstimatePauseSubscriptionBuilder pauseOption(PauseOption value) {
+      this.pauseOption = value;
+      return this;
+    }
+
+    public EstimatePauseSubscriptionBuilder unbilledChargesHandling(UnbilledChargesHandling value) {
+      this.unbilledChargesHandling = value;
+      return this;
+    }
+
+    public EstimatePauseSubscriptionBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public EstimatePauseSubscriptionParams build() {
+      return new EstimatePauseSubscriptionParams(this);
+    }
+  }
+
+  public enum PauseOption {
+    IMMEDIATELY("immediately"),
+
+    END_OF_TERM("end_of_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    BILLING_CYCLES("billing_cycles"),
+
+    /** An enum member indicating that PauseOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PauseOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PauseOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PauseOption enumValue : PauseOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum UnbilledChargesHandling {
+    NO_ACTION("no_action"),
+
+    INVOICE("invoice"),
+
+    /**
+     * An enum member indicating that UnbilledChargesHandling was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    UnbilledChargesHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static UnbilledChargesHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (UnbilledChargesHandling enumValue : UnbilledChargesHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final Timestamp pauseDate;
+
+    private final Timestamp resumeDate;
+
+    private final Integer skipBillingCycles;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.pauseDate = builder.pauseDate;
+
+      this.resumeDate = builder.resumeDate;
+
+      this.skipBillingCycles = builder.skipBillingCycles;
+    }
+
+    public Timestamp getPauseDate() {
+      return pauseDate;
+    }
+
+    public Timestamp getResumeDate() {
+      return resumeDate;
+    }
+
+    public Integer getSkipBillingCycles() {
+      return skipBillingCycles;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.pauseDate != null) {
+
+        formData.put("pause_date", this.pauseDate);
+      }
+
+      if (this.resumeDate != null) {
+
+        formData.put("resume_date", this.resumeDate);
+      }
+
+      if (this.skipBillingCycles != null) {
+
+        formData.put("skip_billing_cycles", this.skipBillingCycles);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private Timestamp pauseDate;
+
+      private Timestamp resumeDate;
+
+      private Integer skipBillingCycles;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder pauseDate(Timestamp value) {
+        this.pauseDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder resumeDate(Timestamp value) {
+        this.resumeDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder skipBillingCycles(Integer value) {
+        this.skipBillingCycles = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/EstimatePaymentSchedulesParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/EstimatePaymentSchedulesParams.java
new file mode 100644
index 00000000..4cf09ae8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/EstimatePaymentSchedulesParams.java
@@ -0,0 +1,121 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class EstimatePaymentSchedulesParams {
+
+  private final String schemeId;
+
+  private final Long amount;
+
+  private final String invoiceId;
+
+  private final Timestamp paymentScheduleStartDate;
+
+  private EstimatePaymentSchedulesParams(EstimatePaymentSchedulesBuilder builder) {
+
+    this.schemeId = builder.schemeId;
+
+    this.amount = builder.amount;
+
+    this.invoiceId = builder.invoiceId;
+
+    this.paymentScheduleStartDate = builder.paymentScheduleStartDate;
+  }
+
+  public String getSchemeId() {
+    return schemeId;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getInvoiceId() {
+    return invoiceId;
+  }
+
+  public Timestamp getPaymentScheduleStartDate() {
+    return paymentScheduleStartDate;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.schemeId != null) {
+
+      formData.put("scheme_id", this.schemeId);
+    }
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.invoiceId != null) {
+
+      formData.put("invoice_id", this.invoiceId);
+    }
+
+    if (this.paymentScheduleStartDate != null) {
+
+      formData.put("payment_schedule_start_date", this.paymentScheduleStartDate);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EstimatePaymentSchedulesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EstimatePaymentSchedulesBuilder builder() {
+    return new EstimatePaymentSchedulesBuilder();
+  }
+
+  public static final class EstimatePaymentSchedulesBuilder {
+
+    private String schemeId;
+
+    private Long amount;
+
+    private String invoiceId;
+
+    private Timestamp paymentScheduleStartDate;
+
+    private EstimatePaymentSchedulesBuilder() {}
+
+    public EstimatePaymentSchedulesBuilder schemeId(String value) {
+      this.schemeId = value;
+      return this;
+    }
+
+    public EstimatePaymentSchedulesBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public EstimatePaymentSchedulesBuilder invoiceId(String value) {
+      this.invoiceId = value;
+      return this;
+    }
+
+    public EstimatePaymentSchedulesBuilder paymentScheduleStartDate(Timestamp value) {
+      this.paymentScheduleStartDate = value;
+      return this;
+    }
+
+    public EstimatePaymentSchedulesParams build() {
+      return new EstimatePaymentSchedulesParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/EstimateResumeSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateResumeSubscriptionParams.java
new file mode 100644
index 00000000..1f1d42c9
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateResumeSubscriptionParams.java
@@ -0,0 +1,210 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class EstimateResumeSubscriptionParams {
+
+  private final ResumeOption resumeOption;
+
+  private final ChargesHandling chargesHandling;
+
+  private final SubscriptionParams subscription;
+
+  private EstimateResumeSubscriptionParams(EstimateResumeSubscriptionBuilder builder) {
+
+    this.resumeOption = builder.resumeOption;
+
+    this.chargesHandling = builder.chargesHandling;
+
+    this.subscription = builder.subscription;
+  }
+
+  public ResumeOption getResumeOption() {
+    return resumeOption;
+  }
+
+  public ChargesHandling getChargesHandling() {
+    return chargesHandling;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.resumeOption != null) {
+
+      formData.put("resume_option", this.resumeOption);
+    }
+
+    if (this.chargesHandling != null) {
+
+      formData.put("charges_handling", this.chargesHandling);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EstimateResumeSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EstimateResumeSubscriptionBuilder builder() {
+    return new EstimateResumeSubscriptionBuilder();
+  }
+
+  public static final class EstimateResumeSubscriptionBuilder {
+
+    private ResumeOption resumeOption;
+
+    private ChargesHandling chargesHandling;
+
+    private SubscriptionParams subscription;
+
+    private EstimateResumeSubscriptionBuilder() {}
+
+    public EstimateResumeSubscriptionBuilder resumeOption(ResumeOption value) {
+      this.resumeOption = value;
+      return this;
+    }
+
+    public EstimateResumeSubscriptionBuilder chargesHandling(ChargesHandling value) {
+      this.chargesHandling = value;
+      return this;
+    }
+
+    public EstimateResumeSubscriptionBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public EstimateResumeSubscriptionParams build() {
+      return new EstimateResumeSubscriptionParams(this);
+    }
+  }
+
+  public enum ResumeOption {
+    IMMEDIATELY("immediately"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    /** An enum member indicating that ResumeOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ResumeOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ResumeOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ResumeOption enumValue : ResumeOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChargesHandling {
+    INVOICE_IMMEDIATELY("invoice_immediately"),
+
+    ADD_TO_UNBILLED_CHARGES("add_to_unbilled_charges"),
+
+    /** An enum member indicating that ChargesHandling was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChargesHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChargesHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChargesHandling enumValue : ChargesHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final Timestamp resumeDate;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.resumeDate = builder.resumeDate;
+    }
+
+    public Timestamp getResumeDate() {
+      return resumeDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.resumeDate != null) {
+
+        formData.put("resume_date", this.resumeDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private Timestamp resumeDate;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder resumeDate(Timestamp value) {
+        this.resumeDate = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/EstimateUpdateSubscriptionForItemsParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateUpdateSubscriptionForItemsParams.java
new file mode 100644
index 00000000..3bc10fb3
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateUpdateSubscriptionForItemsParams.java
@@ -0,0 +1,2733 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EstimateUpdateSubscriptionForItemsParams {
+
+  private final Timestamp changesScheduledAt;
+
+  private final ChangeOption changeOption;
+
+  private final List<String> mandatoryItemsToRemove;
+
+  private final Boolean replaceItemsList;
+
+  private final Timestamp invoiceDate;
+
+  private final Integer billingCycles;
+
+  private final Integer termsToCharge;
+
+  private final Timestamp reactivateFrom;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final Boolean replaceCouponList;
+
+  private final Boolean prorate;
+
+  private final Boolean endOfTerm;
+
+  private final Boolean forceTermReset;
+
+  private final Boolean reactivate;
+
+  private final Boolean includeDelayedCharges;
+
+  private final Boolean useExistingBalances;
+
+  private final Boolean invoiceImmediately;
+
+  private final Boolean invoiceUsages;
+
+  private final SubscriptionParams subscription;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final CustomerParams customer;
+
+  private final BillingOverrideParams billingOverride;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private EstimateUpdateSubscriptionForItemsParams(
+      EstimateUpdateSubscriptionForItemsBuilder builder) {
+
+    this.changesScheduledAt = builder.changesScheduledAt;
+
+    this.changeOption = builder.changeOption;
+
+    this.mandatoryItemsToRemove = builder.mandatoryItemsToRemove;
+
+    this.replaceItemsList = builder.replaceItemsList;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.reactivateFrom = builder.reactivateFrom;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.replaceCouponList = builder.replaceCouponList;
+
+    this.prorate = builder.prorate;
+
+    this.endOfTerm = builder.endOfTerm;
+
+    this.forceTermReset = builder.forceTermReset;
+
+    this.reactivate = builder.reactivate;
+
+    this.includeDelayedCharges = builder.includeDelayedCharges;
+
+    this.useExistingBalances = builder.useExistingBalances;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.invoiceUsages = builder.invoiceUsages;
+
+    this.subscription = builder.subscription;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.customer = builder.customer;
+
+    this.billingOverride = builder.billingOverride;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.discounts = builder.discounts;
+
+    this.itemTiers = builder.itemTiers;
+  }
+
+  public Timestamp getChangesScheduledAt() {
+    return changesScheduledAt;
+  }
+
+  public ChangeOption getChangeOption() {
+    return changeOption;
+  }
+
+  public List<String> getMandatoryItemsToRemove() {
+    return mandatoryItemsToRemove;
+  }
+
+  public Boolean getReplaceItemsList() {
+    return replaceItemsList;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public Timestamp getReactivateFrom() {
+    return reactivateFrom;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public Boolean getReplaceCouponList() {
+    return replaceCouponList;
+  }
+
+  public Boolean getProrate() {
+    return prorate;
+  }
+
+  public Boolean getEndOfTerm() {
+    return endOfTerm;
+  }
+
+  public Boolean getForceTermReset() {
+    return forceTermReset;
+  }
+
+  public Boolean getReactivate() {
+    return reactivate;
+  }
+
+  public Boolean getIncludeDelayedCharges() {
+    return includeDelayedCharges;
+  }
+
+  public Boolean getUseExistingBalances() {
+    return useExistingBalances;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public Boolean getInvoiceUsages() {
+    return invoiceUsages;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public BillingOverrideParams getBillingOverride() {
+    return billingOverride;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.changesScheduledAt != null) {
+
+      formData.put("changes_scheduled_at", this.changesScheduledAt);
+    }
+
+    if (this.changeOption != null) {
+
+      formData.put("change_option", this.changeOption);
+    }
+
+    if (this.mandatoryItemsToRemove != null) {
+
+      formData.put("mandatory_items_to_remove", this.mandatoryItemsToRemove);
+    }
+
+    if (this.replaceItemsList != null) {
+
+      formData.put("replace_items_list", this.replaceItemsList);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.reactivateFrom != null) {
+
+      formData.put("reactivate_from", this.reactivateFrom);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.replaceCouponList != null) {
+
+      formData.put("replace_coupon_list", this.replaceCouponList);
+    }
+
+    if (this.prorate != null) {
+
+      formData.put("prorate", this.prorate);
+    }
+
+    if (this.endOfTerm != null) {
+
+      formData.put("end_of_term", this.endOfTerm);
+    }
+
+    if (this.forceTermReset != null) {
+
+      formData.put("force_term_reset", this.forceTermReset);
+    }
+
+    if (this.reactivate != null) {
+
+      formData.put("reactivate", this.reactivate);
+    }
+
+    if (this.includeDelayedCharges != null) {
+
+      formData.put("include_delayed_charges", this.includeDelayedCharges);
+    }
+
+    if (this.useExistingBalances != null) {
+
+      formData.put("use_existing_balances", this.useExistingBalances);
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.invoiceUsages != null) {
+
+      formData.put("invoice_usages", this.invoiceUsages);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingOverride != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingOverride.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_override[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EstimateUpdateSubscriptionForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EstimateUpdateSubscriptionForItemsBuilder builder() {
+    return new EstimateUpdateSubscriptionForItemsBuilder();
+  }
+
+  public static final class EstimateUpdateSubscriptionForItemsBuilder {
+
+    private Timestamp changesScheduledAt;
+
+    private ChangeOption changeOption;
+
+    private List<String> mandatoryItemsToRemove;
+
+    private Boolean replaceItemsList;
+
+    private Timestamp invoiceDate;
+
+    private Integer billingCycles;
+
+    private Integer termsToCharge;
+
+    private Timestamp reactivateFrom;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private Boolean replaceCouponList;
+
+    private Boolean prorate;
+
+    private Boolean endOfTerm;
+
+    private Boolean forceTermReset;
+
+    private Boolean reactivate;
+
+    private Boolean includeDelayedCharges;
+
+    private Boolean useExistingBalances;
+
+    private Boolean invoiceImmediately;
+
+    private Boolean invoiceUsages;
+
+    private SubscriptionParams subscription;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private CustomerParams customer;
+
+    private BillingOverrideParams billingOverride;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<DiscountsParams> discounts;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private EstimateUpdateSubscriptionForItemsBuilder() {}
+
+    public EstimateUpdateSubscriptionForItemsBuilder changesScheduledAt(Timestamp value) {
+      this.changesScheduledAt = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder changeOption(ChangeOption value) {
+      this.changeOption = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder mandatoryItemsToRemove(List<String> value) {
+      this.mandatoryItemsToRemove = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder replaceItemsList(Boolean value) {
+      this.replaceItemsList = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder reactivateFrom(Timestamp value) {
+      this.reactivateFrom = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder billingAlignmentMode(
+        BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder replaceCouponList(Boolean value) {
+      this.replaceCouponList = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder prorate(Boolean value) {
+      this.prorate = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder endOfTerm(Boolean value) {
+      this.endOfTerm = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder forceTermReset(Boolean value) {
+      this.forceTermReset = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder reactivate(Boolean value) {
+      this.reactivate = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder includeDelayedCharges(Boolean value) {
+      this.includeDelayedCharges = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder useExistingBalances(Boolean value) {
+      this.useExistingBalances = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder invoiceUsages(Boolean value) {
+      this.invoiceUsages = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder billingOverride(BillingOverrideParams value) {
+      this.billingOverride = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionForItemsParams build() {
+      return new EstimateUpdateSubscriptionForItemsParams(this);
+    }
+  }
+
+  public enum ChangeOption {
+    IMMEDIATELY("immediately"),
+
+    END_OF_TERM("end_of_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChangeOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChangeOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChangeOption enumValue : ChangeOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final Long setupFee;
+
+    private final Timestamp startDate;
+
+    private final Timestamp trialEnd;
+
+    private final String coupon;
+
+    private final AutoCollection autoCollection;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Integer freePeriod;
+
+    private final FreePeriodUnit freePeriodUnit;
+
+    private final TrialEndAction trialEndAction;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.setupFee = builder.setupFee;
+
+      this.startDate = builder.startDate;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.coupon = builder.coupon;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.freePeriod = builder.freePeriod;
+
+      this.freePeriodUnit = builder.freePeriodUnit;
+
+      this.trialEndAction = builder.trialEndAction;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public String getCoupon() {
+      return coupon;
+    }
+
+    public AutoCollection getAutoCollection() {
+      return autoCollection;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Integer getFreePeriod() {
+      return freePeriod;
+    }
+
+    public FreePeriodUnit getFreePeriodUnit() {
+      return freePeriodUnit;
+    }
+
+    public TrialEndAction getTrialEndAction() {
+      return trialEndAction;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.coupon != null) {
+
+        formData.put("coupon", this.coupon);
+      }
+
+      if (this.autoCollection != null) {
+
+        formData.put("auto_collection", this.autoCollection);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.freePeriod != null) {
+
+        formData.put("free_period", this.freePeriod);
+      }
+
+      if (this.freePeriodUnit != null) {
+
+        formData.put("free_period_unit", this.freePeriodUnit);
+      }
+
+      if (this.trialEndAction != null) {
+
+        formData.put("trial_end_action", this.trialEndAction);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private Long setupFee;
+
+      private Timestamp startDate;
+
+      private Timestamp trialEnd;
+
+      private String coupon;
+
+      private AutoCollection autoCollection;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Integer freePeriod;
+
+      private FreePeriodUnit freePeriodUnit;
+
+      private TrialEndAction trialEndAction;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder coupon(String value) {
+        this.coupon = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCollection(AutoCollection value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder freePeriod(Integer value) {
+        this.freePeriod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder freePeriodUnit(FreePeriodUnit value) {
+        this.freePeriodUnit = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEndAction(TrialEndAction value) {
+        this.trialEndAction = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum AutoCollection {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AutoCollection(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AutoCollection fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AutoCollection enumValue : AutoCollection.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum FreePeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      FreePeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static FreePeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum TrialEndAction {
+      SITE_DEFAULT("site_default"),
+
+      PLAN_DEFAULT("plan_default"),
+
+      ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+      CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+      /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      TrialEndAction(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static TrialEndAction fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (TrialEndAction enumValue : TrialEndAction.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final Boolean registeredForGst;
+
+    private final Taxability taxability;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.registeredForGst = builder.registeredForGst;
+
+      this.taxability = builder.taxability;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public Boolean getRegisteredForGst() {
+      return registeredForGst;
+    }
+
+    public Taxability getTaxability() {
+      return taxability;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.registeredForGst != null) {
+
+        formData.put("registered_for_gst", this.registeredForGst);
+      }
+
+      if (this.taxability != null) {
+
+        formData.put("taxability", this.taxability);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private Boolean registeredForGst;
+
+      private Taxability taxability;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder registeredForGst(Boolean value) {
+        this.registeredForGst = value;
+        return this;
+      }
+
+      @Deprecated
+      public CustomerBuilder taxability(Taxability value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+
+    public enum Taxability {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Taxability was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Taxability(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Taxability fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Taxability enumValue : Taxability.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingOverrideParams {
+
+    private final Long maxExcessPaymentUsage;
+
+    private final Long maxRefundableCreditsUsage;
+
+    private BillingOverrideParams(BillingOverrideBuilder builder) {
+
+      this.maxExcessPaymentUsage = builder.maxExcessPaymentUsage;
+
+      this.maxRefundableCreditsUsage = builder.maxRefundableCreditsUsage;
+    }
+
+    public Long getMaxExcessPaymentUsage() {
+      return maxExcessPaymentUsage;
+    }
+
+    public Long getMaxRefundableCreditsUsage() {
+      return maxRefundableCreditsUsage;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.maxExcessPaymentUsage != null) {
+
+        formData.put("max_excess_payment_usage", this.maxExcessPaymentUsage);
+      }
+
+      if (this.maxRefundableCreditsUsage != null) {
+
+        formData.put("max_refundable_credits_usage", this.maxRefundableCreditsUsage);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingOverrideParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingOverrideBuilder builder() {
+      return new BillingOverrideBuilder();
+    }
+
+    public static final class BillingOverrideBuilder {
+
+      private Long maxExcessPaymentUsage;
+
+      private Long maxRefundableCreditsUsage;
+
+      private BillingOverrideBuilder() {}
+
+      public BillingOverrideBuilder maxExcessPaymentUsage(Long value) {
+        this.maxExcessPaymentUsage = value;
+        return this;
+      }
+
+      public BillingOverrideBuilder maxRefundableCreditsUsage(Long value) {
+        this.maxRefundableCreditsUsage = value;
+        return this;
+      }
+
+      public BillingOverrideParams build() {
+        return new BillingOverrideParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private final ItemType itemType;
+
+    private final ProrationType prorationType;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOnOption = builder.chargeOnOption;
+
+      this.itemType = builder.itemType;
+
+      this.prorationType = builder.prorationType;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public ProrationType getProrationType() {
+      return prorationType;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.prorationType != null) {
+
+        formData.put("proration_type", this.prorationType);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOnOption chargeOnOption;
+
+      private ItemType itemType;
+
+      private ProrationType prorationType;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder prorationType(ProrationType value) {
+        this.prorationType = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ProrationType {
+      FULL_TERM("full_term"),
+
+      PARTIAL_TERM("partial_term"),
+
+      NONE("none"),
+
+      /** An enum member indicating that ProrationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ProrationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ProrationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ProrationType enumValue : ProrationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final OperationType operationType;
+
+    private final String id;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.operationType = builder.operationType;
+
+      this.id = builder.id;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public OperationType getOperationType() {
+      return operationType;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.operationType != null) {
+
+        formData.put("operation_type", this.operationType);
+      }
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private OperationType operationType;
+
+      private String id;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder operationType(OperationType value) {
+        this.operationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OperationType {
+      ADD("add"),
+
+      REMOVE("remove"),
+
+      /** An enum member indicating that OperationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OperationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OperationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OperationType enumValue : OperationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/EstimateUpdateSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateUpdateSubscriptionParams.java
new file mode 100644
index 00000000..b52db207
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/EstimateUpdateSubscriptionParams.java
@@ -0,0 +1,2160 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EstimateUpdateSubscriptionParams {
+
+  private final Timestamp changesScheduledAt;
+
+  private final ChangeOption changeOption;
+
+  private final Boolean replaceAddonList;
+
+  private final List<String> mandatoryAddonsToRemove;
+
+  private final Timestamp invoiceDate;
+
+  private final Integer billingCycles;
+
+  private final Integer termsToCharge;
+
+  private final Timestamp reactivateFrom;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final Boolean replaceCouponList;
+
+  private final Boolean prorate;
+
+  private final Boolean endOfTerm;
+
+  private final Boolean forceTermReset;
+
+  private final Boolean reactivate;
+
+  private final Boolean includeDelayedCharges;
+
+  private final Boolean useExistingBalances;
+
+  private final Boolean invoiceImmediately;
+
+  private final SubscriptionParams subscription;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final CustomerParams customer;
+
+  private final List<AddonsParams> addons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private EstimateUpdateSubscriptionParams(EstimateUpdateSubscriptionBuilder builder) {
+
+    this.changesScheduledAt = builder.changesScheduledAt;
+
+    this.changeOption = builder.changeOption;
+
+    this.replaceAddonList = builder.replaceAddonList;
+
+    this.mandatoryAddonsToRemove = builder.mandatoryAddonsToRemove;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.reactivateFrom = builder.reactivateFrom;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.replaceCouponList = builder.replaceCouponList;
+
+    this.prorate = builder.prorate;
+
+    this.endOfTerm = builder.endOfTerm;
+
+    this.forceTermReset = builder.forceTermReset;
+
+    this.reactivate = builder.reactivate;
+
+    this.includeDelayedCharges = builder.includeDelayedCharges;
+
+    this.useExistingBalances = builder.useExistingBalances;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.subscription = builder.subscription;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.customer = builder.customer;
+
+    this.addons = builder.addons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+  }
+
+  public Timestamp getChangesScheduledAt() {
+    return changesScheduledAt;
+  }
+
+  public ChangeOption getChangeOption() {
+    return changeOption;
+  }
+
+  public Boolean getReplaceAddonList() {
+    return replaceAddonList;
+  }
+
+  public List<String> getMandatoryAddonsToRemove() {
+    return mandatoryAddonsToRemove;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public Timestamp getReactivateFrom() {
+    return reactivateFrom;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public Boolean getReplaceCouponList() {
+    return replaceCouponList;
+  }
+
+  public Boolean getProrate() {
+    return prorate;
+  }
+
+  public Boolean getEndOfTerm() {
+    return endOfTerm;
+  }
+
+  public Boolean getForceTermReset() {
+    return forceTermReset;
+  }
+
+  public Boolean getReactivate() {
+    return reactivate;
+  }
+
+  public Boolean getIncludeDelayedCharges() {
+    return includeDelayedCharges;
+  }
+
+  public Boolean getUseExistingBalances() {
+    return useExistingBalances;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.changesScheduledAt != null) {
+
+      formData.put("changes_scheduled_at", this.changesScheduledAt);
+    }
+
+    if (this.changeOption != null) {
+
+      formData.put("change_option", this.changeOption);
+    }
+
+    if (this.replaceAddonList != null) {
+
+      formData.put("replace_addon_list", this.replaceAddonList);
+    }
+
+    if (this.mandatoryAddonsToRemove != null) {
+
+      formData.put("mandatory_addons_to_remove", this.mandatoryAddonsToRemove);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.reactivateFrom != null) {
+
+      formData.put("reactivate_from", this.reactivateFrom);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.replaceCouponList != null) {
+
+      formData.put("replace_coupon_list", this.replaceCouponList);
+    }
+
+    if (this.prorate != null) {
+
+      formData.put("prorate", this.prorate);
+    }
+
+    if (this.endOfTerm != null) {
+
+      formData.put("end_of_term", this.endOfTerm);
+    }
+
+    if (this.forceTermReset != null) {
+
+      formData.put("force_term_reset", this.forceTermReset);
+    }
+
+    if (this.reactivate != null) {
+
+      formData.put("reactivate", this.reactivate);
+    }
+
+    if (this.includeDelayedCharges != null) {
+
+      formData.put("include_delayed_charges", this.includeDelayedCharges);
+    }
+
+    if (this.useExistingBalances != null) {
+
+      formData.put("use_existing_balances", this.useExistingBalances);
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EstimateUpdateSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EstimateUpdateSubscriptionBuilder builder() {
+    return new EstimateUpdateSubscriptionBuilder();
+  }
+
+  public static final class EstimateUpdateSubscriptionBuilder {
+
+    private Timestamp changesScheduledAt;
+
+    private ChangeOption changeOption;
+
+    private Boolean replaceAddonList;
+
+    private List<String> mandatoryAddonsToRemove;
+
+    private Timestamp invoiceDate;
+
+    private Integer billingCycles;
+
+    private Integer termsToCharge;
+
+    private Timestamp reactivateFrom;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private Boolean replaceCouponList;
+
+    private Boolean prorate;
+
+    private Boolean endOfTerm;
+
+    private Boolean forceTermReset;
+
+    private Boolean reactivate;
+
+    private Boolean includeDelayedCharges;
+
+    private Boolean useExistingBalances;
+
+    private Boolean invoiceImmediately;
+
+    private SubscriptionParams subscription;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private CustomerParams customer;
+
+    private List<AddonsParams> addons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private EstimateUpdateSubscriptionBuilder() {}
+
+    public EstimateUpdateSubscriptionBuilder changesScheduledAt(Timestamp value) {
+      this.changesScheduledAt = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder changeOption(ChangeOption value) {
+      this.changeOption = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder replaceAddonList(Boolean value) {
+      this.replaceAddonList = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder mandatoryAddonsToRemove(List<String> value) {
+      this.mandatoryAddonsToRemove = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder reactivateFrom(Timestamp value) {
+      this.reactivateFrom = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder replaceCouponList(Boolean value) {
+      this.replaceCouponList = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder prorate(Boolean value) {
+      this.prorate = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder endOfTerm(Boolean value) {
+      this.endOfTerm = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder forceTermReset(Boolean value) {
+      this.forceTermReset = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder reactivate(Boolean value) {
+      this.reactivate = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder includeDelayedCharges(Boolean value) {
+      this.includeDelayedCharges = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder useExistingBalances(Boolean value) {
+      this.useExistingBalances = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public EstimateUpdateSubscriptionParams build() {
+      return new EstimateUpdateSubscriptionParams(this);
+    }
+  }
+
+  public enum ChangeOption {
+    IMMEDIATELY("immediately"),
+
+    END_OF_TERM("end_of_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChangeOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChangeOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChangeOption enumValue : ChangeOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final String planId;
+
+    private final Integer planQuantity;
+
+    private final Long planUnitPrice;
+
+    private final Long setupFee;
+
+    private final String planQuantityInDecimal;
+
+    private final String planUnitPriceInDecimal;
+
+    private final Timestamp startDate;
+
+    private final Timestamp trialEnd;
+
+    private final String coupon;
+
+    private final AutoCollection autoCollection;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Integer freePeriod;
+
+    private final FreePeriodUnit freePeriodUnit;
+
+    private final TrialEndAction trialEndAction;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.planId = builder.planId;
+
+      this.planQuantity = builder.planQuantity;
+
+      this.planUnitPrice = builder.planUnitPrice;
+
+      this.setupFee = builder.setupFee;
+
+      this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+      this.planUnitPriceInDecimal = builder.planUnitPriceInDecimal;
+
+      this.startDate = builder.startDate;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.coupon = builder.coupon;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.freePeriod = builder.freePeriod;
+
+      this.freePeriodUnit = builder.freePeriodUnit;
+
+      this.trialEndAction = builder.trialEndAction;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getPlanId() {
+      return planId;
+    }
+
+    public Integer getPlanQuantity() {
+      return planQuantity;
+    }
+
+    public Long getPlanUnitPrice() {
+      return planUnitPrice;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public String getPlanQuantityInDecimal() {
+      return planQuantityInDecimal;
+    }
+
+    public String getPlanUnitPriceInDecimal() {
+      return planUnitPriceInDecimal;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public String getCoupon() {
+      return coupon;
+    }
+
+    public AutoCollection getAutoCollection() {
+      return autoCollection;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Integer getFreePeriod() {
+      return freePeriod;
+    }
+
+    public FreePeriodUnit getFreePeriodUnit() {
+      return freePeriodUnit;
+    }
+
+    public TrialEndAction getTrialEndAction() {
+      return trialEndAction;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.planId != null) {
+
+        formData.put("plan_id", this.planId);
+      }
+
+      if (this.planQuantity != null) {
+
+        formData.put("plan_quantity", this.planQuantity);
+      }
+
+      if (this.planUnitPrice != null) {
+
+        formData.put("plan_unit_price", this.planUnitPrice);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.planQuantityInDecimal != null) {
+
+        formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+      }
+
+      if (this.planUnitPriceInDecimal != null) {
+
+        formData.put("plan_unit_price_in_decimal", this.planUnitPriceInDecimal);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.coupon != null) {
+
+        formData.put("coupon", this.coupon);
+      }
+
+      if (this.autoCollection != null) {
+
+        formData.put("auto_collection", this.autoCollection);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.freePeriod != null) {
+
+        formData.put("free_period", this.freePeriod);
+      }
+
+      if (this.freePeriodUnit != null) {
+
+        formData.put("free_period_unit", this.freePeriodUnit);
+      }
+
+      if (this.trialEndAction != null) {
+
+        formData.put("trial_end_action", this.trialEndAction);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private String planId;
+
+      private Integer planQuantity;
+
+      private Long planUnitPrice;
+
+      private Long setupFee;
+
+      private String planQuantityInDecimal;
+
+      private String planUnitPriceInDecimal;
+
+      private Timestamp startDate;
+
+      private Timestamp trialEnd;
+
+      private String coupon;
+
+      private AutoCollection autoCollection;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Integer freePeriod;
+
+      private FreePeriodUnit freePeriodUnit;
+
+      private TrialEndAction trialEndAction;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planId(String value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantity(Integer value) {
+        this.planQuantity = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPrice(Long value) {
+        this.planUnitPrice = value;
+        return this;
+      }
+
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantityInDecimal(String value) {
+        this.planQuantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
+        this.planUnitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder coupon(String value) {
+        this.coupon = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCollection(AutoCollection value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder freePeriod(Integer value) {
+        this.freePeriod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder freePeriodUnit(FreePeriodUnit value) {
+        this.freePeriodUnit = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEndAction(TrialEndAction value) {
+        this.trialEndAction = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum AutoCollection {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AutoCollection(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AutoCollection fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AutoCollection enumValue : AutoCollection.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum FreePeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      FreePeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static FreePeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum TrialEndAction {
+      SITE_DEFAULT("site_default"),
+
+      PLAN_DEFAULT("plan_default"),
+
+      ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+      CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+      /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      TrialEndAction(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static TrialEndAction fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (TrialEndAction enumValue : TrialEndAction.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final Boolean registeredForGst;
+
+    private final Taxability taxability;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.registeredForGst = builder.registeredForGst;
+
+      this.taxability = builder.taxability;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public Boolean getRegisteredForGst() {
+      return registeredForGst;
+    }
+
+    public Taxability getTaxability() {
+      return taxability;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.registeredForGst != null) {
+
+        formData.put("registered_for_gst", this.registeredForGst);
+      }
+
+      if (this.taxability != null) {
+
+        formData.put("taxability", this.taxability);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private Boolean registeredForGst;
+
+      private Taxability taxability;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder registeredForGst(Boolean value) {
+        this.registeredForGst = value;
+        return this;
+      }
+
+      @Deprecated
+      public CustomerBuilder taxability(Taxability value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+
+    public enum Taxability {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Taxability was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Taxability(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Taxability fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Taxability enumValue : Taxability.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final Integer billingCycles;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp trialEnd;
+
+    private final ProrationType prorationType;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.prorationType = builder.prorationType;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public ProrationType getProrationType() {
+      return prorationType;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.prorationType != null) {
+
+        formData.put("proration_type", this.prorationType);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private Integer billingCycles;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp trialEnd;
+
+      private ProrationType prorationType;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public AddonsBuilder prorationType(ProrationType value) {
+        this.prorationType = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+
+    public enum ProrationType {
+      FULL_TERM("full_term"),
+
+      PARTIAL_TERM("partial_term"),
+
+      NONE("none"),
+
+      /** An enum member indicating that ProrationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ProrationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ProrationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ProrationType enumValue : ProrationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final Integer servicePeriodInDays;
+
+    private final ChargeOn chargeOn;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+
+      this.chargeOn = builder.chargeOn;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    public ChargeOn getChargeOn() {
+      return chargeOn;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      if (this.chargeOn != null) {
+
+        formData.put("charge_on", this.chargeOn);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private Integer servicePeriodInDays;
+
+      private ChargeOn chargeOn;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
+        this.chargeOn = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum ChargeOn {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOn enumValue : ChargeOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/RegenerateInvoiceEstimateParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/RegenerateInvoiceEstimateParams.java
new file mode 100644
index 00000000..46ff139d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/RegenerateInvoiceEstimateParams.java
@@ -0,0 +1,121 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class RegenerateInvoiceEstimateParams {
+
+  private final Timestamp dateFrom;
+
+  private final Timestamp dateTo;
+
+  private final Boolean prorate;
+
+  private final Boolean invoiceImmediately;
+
+  private RegenerateInvoiceEstimateParams(RegenerateInvoiceEstimateBuilder builder) {
+
+    this.dateFrom = builder.dateFrom;
+
+    this.dateTo = builder.dateTo;
+
+    this.prorate = builder.prorate;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+  }
+
+  public Timestamp getDateFrom() {
+    return dateFrom;
+  }
+
+  public Timestamp getDateTo() {
+    return dateTo;
+  }
+
+  public Boolean getProrate() {
+    return prorate;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.dateFrom != null) {
+
+      formData.put("date_from", this.dateFrom);
+    }
+
+    if (this.dateTo != null) {
+
+      formData.put("date_to", this.dateTo);
+    }
+
+    if (this.prorate != null) {
+
+      formData.put("prorate", this.prorate);
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for RegenerateInvoiceEstimateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static RegenerateInvoiceEstimateBuilder builder() {
+    return new RegenerateInvoiceEstimateBuilder();
+  }
+
+  public static final class RegenerateInvoiceEstimateBuilder {
+
+    private Timestamp dateFrom;
+
+    private Timestamp dateTo;
+
+    private Boolean prorate;
+
+    private Boolean invoiceImmediately;
+
+    private RegenerateInvoiceEstimateBuilder() {}
+
+    public RegenerateInvoiceEstimateBuilder dateFrom(Timestamp value) {
+      this.dateFrom = value;
+      return this;
+    }
+
+    public RegenerateInvoiceEstimateBuilder dateTo(Timestamp value) {
+      this.dateTo = value;
+      return this;
+    }
+
+    public RegenerateInvoiceEstimateBuilder prorate(Boolean value) {
+      this.prorate = value;
+      return this;
+    }
+
+    public RegenerateInvoiceEstimateBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public RegenerateInvoiceEstimateParams build() {
+      return new RegenerateInvoiceEstimateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/RenewalEstimateParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/RenewalEstimateParams.java
new file mode 100644
index 00000000..e15be559
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/RenewalEstimateParams.java
@@ -0,0 +1,103 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class RenewalEstimateParams {
+
+  private final Map<String, Object> queryParams;
+
+  private RenewalEstimateParams(RenewalEstimateBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public RenewalEstimateBuilder toBuilder() {
+    RenewalEstimateBuilder builder = new RenewalEstimateBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for RenewalEstimateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static RenewalEstimateBuilder builder() {
+    return new RenewalEstimateBuilder();
+  }
+
+  public static final class RenewalEstimateBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private RenewalEstimateBuilder() {}
+
+    public RenewalEstimateBuilder includeDelayedCharges(Boolean value) {
+      queryParams.put("include_delayed_charges", value);
+      return this;
+    }
+
+    public RenewalEstimateBuilder useExistingBalances(Boolean value) {
+      queryParams.put("use_existing_balances", value);
+      return this;
+    }
+
+    public RenewalEstimateBuilder ignoreScheduledCancellation(Boolean value) {
+      queryParams.put("ignore_scheduled_cancellation", value);
+      return this;
+    }
+
+    public RenewalEstimateBuilder ignoreScheduledChanges(Boolean value) {
+      queryParams.put("ignore_scheduled_changes", value);
+      return this;
+    }
+
+    public RenewalEstimateBuilder excludeTaxType(ExcludeTaxType value) {
+      queryParams.put("exclude_tax_type", value);
+      return this;
+    }
+
+    public RenewalEstimateParams build() {
+      return new RenewalEstimateParams(this);
+    }
+  }
+
+  public enum ExcludeTaxType {
+    EXCLUSIVE("exclusive"),
+
+    NONE("none"),
+
+    /** An enum member indicating that ExcludeTaxType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ExcludeTaxType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ExcludeTaxType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ExcludeTaxType enumValue : ExcludeTaxType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/params/UpcomingInvoicesEstimateParams.java b/src/main/java/com/chargebee/v4/models/estimate/params/UpcomingInvoicesEstimateParams.java
new file mode 100644
index 00000000..fa7fc50d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/params/UpcomingInvoicesEstimateParams.java
@@ -0,0 +1,50 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.estimate.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class UpcomingInvoicesEstimateParams {
+
+  private final Map<String, Object> queryParams;
+
+  private UpcomingInvoicesEstimateParams(UpcomingInvoicesEstimateBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public UpcomingInvoicesEstimateBuilder toBuilder() {
+    UpcomingInvoicesEstimateBuilder builder = new UpcomingInvoicesEstimateBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for UpcomingInvoicesEstimateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UpcomingInvoicesEstimateBuilder builder() {
+    return new UpcomingInvoicesEstimateBuilder();
+  }
+
+  public static final class UpcomingInvoicesEstimateBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private UpcomingInvoicesEstimateBuilder() {}
+
+    public UpcomingInvoicesEstimateParams build() {
+      return new UpcomingInvoicesEstimateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/responses/AdvanceInvoiceEstimateResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/AdvanceInvoiceEstimateResponse.java
new file mode 100644
index 00000000..ca0ba476
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/AdvanceInvoiceEstimateResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.estimate.responses;
+
+import com.chargebee.v4.models.estimate.Estimate;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for AdvanceInvoiceEstimate operation. Contains the response data from
+ * the API.
+ */
+public final class AdvanceInvoiceEstimateResponse extends BaseResponse {
+  private final Estimate estimate;
+
+  private AdvanceInvoiceEstimateResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.estimate = builder.estimate;
+  }
+
+  /** Parse JSON response into AdvanceInvoiceEstimateResponse object. */
+  public static AdvanceInvoiceEstimateResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into AdvanceInvoiceEstimateResponse object with HTTP response. */
+  public static AdvanceInvoiceEstimateResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __estimateJson = JsonUtil.getObject(json, "estimate");
+      if (__estimateJson != null) {
+        builder.estimate(Estimate.fromJson(__estimateJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse AdvanceInvoiceEstimateResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for AdvanceInvoiceEstimateResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for AdvanceInvoiceEstimateResponse. */
+  public static class Builder {
+
+    private Estimate estimate;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder estimate(Estimate estimate) {
+      this.estimate = estimate;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public AdvanceInvoiceEstimateResponse build() {
+      return new AdvanceInvoiceEstimateResponse(this);
+    }
+  }
+
+  /** Get the estimate from the response. */
+  public Estimate getEstimate() {
+    return estimate;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/responses/CreateSubscriptionForCustomerEstimateResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/CreateSubscriptionForCustomerEstimateResponse.java
new file mode 100644
index 00000000..7371b7e8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/CreateSubscriptionForCustomerEstimateResponse.java
@@ -0,0 +1,82 @@
+package com.chargebee.v4.models.estimate.responses;
+
+import com.chargebee.v4.models.estimate.Estimate;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CreateSubscriptionForCustomerEstimate operation. Contains the
+ * response data from a single resource get operation.
+ */
+public final class CreateSubscriptionForCustomerEstimateResponse extends BaseResponse {
+  private final Estimate estimate;
+
+  private CreateSubscriptionForCustomerEstimateResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.estimate = builder.estimate;
+  }
+
+  /** Parse JSON response into CreateSubscriptionForCustomerEstimateResponse object. */
+  public static CreateSubscriptionForCustomerEstimateResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into CreateSubscriptionForCustomerEstimateResponse object with HTTP
+   * response.
+   */
+  public static CreateSubscriptionForCustomerEstimateResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __estimateJson = JsonUtil.getObject(json, "estimate");
+      if (__estimateJson != null) {
+        builder.estimate(Estimate.fromJson(__estimateJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse CreateSubscriptionForCustomerEstimateResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CreateSubscriptionForCustomerEstimateResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CreateSubscriptionForCustomerEstimateResponse. */
+  public static class Builder {
+
+    private Estimate estimate;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder estimate(Estimate estimate) {
+      this.estimate = estimate;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerEstimateResponse build() {
+      return new CreateSubscriptionForCustomerEstimateResponse(this);
+    }
+  }
+
+  /** Get the estimate from the response. */
+  public Estimate getEstimate() {
+    return estimate;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/responses/CreateSubscriptionItemEstimateResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/CreateSubscriptionItemEstimateResponse.java
new file mode 100644
index 00000000..5d3bfb5d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/CreateSubscriptionItemEstimateResponse.java
@@ -0,0 +1,79 @@
+package com.chargebee.v4.models.estimate.responses;
+
+import com.chargebee.v4.models.estimate.Estimate;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CreateSubscriptionItemEstimate operation. Contains the response
+ * data from the API.
+ */
+public final class CreateSubscriptionItemEstimateResponse extends BaseResponse {
+  private final Estimate estimate;
+
+  private CreateSubscriptionItemEstimateResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.estimate = builder.estimate;
+  }
+
+  /** Parse JSON response into CreateSubscriptionItemEstimateResponse object. */
+  public static CreateSubscriptionItemEstimateResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CreateSubscriptionItemEstimateResponse object with HTTP response. */
+  public static CreateSubscriptionItemEstimateResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __estimateJson = JsonUtil.getObject(json, "estimate");
+      if (__estimateJson != null) {
+        builder.estimate(Estimate.fromJson(__estimateJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse CreateSubscriptionItemEstimateResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CreateSubscriptionItemEstimateResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CreateSubscriptionItemEstimateResponse. */
+  public static class Builder {
+
+    private Estimate estimate;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder estimate(Estimate estimate) {
+      this.estimate = estimate;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CreateSubscriptionItemEstimateResponse build() {
+      return new CreateSubscriptionItemEstimateResponse(this);
+    }
+  }
+
+  /** Get the estimate from the response. */
+  public Estimate getEstimate() {
+    return estimate;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/responses/CreateSubscriptionItemForCustomerEstimateResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/CreateSubscriptionItemForCustomerEstimateResponse.java
new file mode 100644
index 00000000..418da411
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/CreateSubscriptionItemForCustomerEstimateResponse.java
@@ -0,0 +1,82 @@
+package com.chargebee.v4.models.estimate.responses;
+
+import com.chargebee.v4.models.estimate.Estimate;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CreateSubscriptionItemForCustomerEstimate operation. Contains the
+ * response data from the API.
+ */
+public final class CreateSubscriptionItemForCustomerEstimateResponse extends BaseResponse {
+  private final Estimate estimate;
+
+  private CreateSubscriptionItemForCustomerEstimateResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.estimate = builder.estimate;
+  }
+
+  /** Parse JSON response into CreateSubscriptionItemForCustomerEstimateResponse object. */
+  public static CreateSubscriptionItemForCustomerEstimateResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into CreateSubscriptionItemForCustomerEstimateResponse object with HTTP
+   * response.
+   */
+  public static CreateSubscriptionItemForCustomerEstimateResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __estimateJson = JsonUtil.getObject(json, "estimate");
+      if (__estimateJson != null) {
+        builder.estimate(Estimate.fromJson(__estimateJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse CreateSubscriptionItemForCustomerEstimateResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CreateSubscriptionItemForCustomerEstimateResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CreateSubscriptionItemForCustomerEstimateResponse. */
+  public static class Builder {
+
+    private Estimate estimate;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder estimate(Estimate estimate) {
+      this.estimate = estimate;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CreateSubscriptionItemForCustomerEstimateResponse build() {
+      return new CreateSubscriptionItemForCustomerEstimateResponse(this);
+    }
+  }
+
+  /** Get the estimate from the response. */
+  public Estimate getEstimate() {
+    return estimate;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCancelSubscriptionForItemsResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCancelSubscriptionForItemsResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCancelSubscriptionForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCancelSubscriptionForItemsResponse.java
index 74b7c980..df53d1ca 100644
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCancelSubscriptionForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCancelSubscriptionForItemsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.estimate;
+package com.chargebee.v4.models.estimate.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCancelSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCancelSubscriptionResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCancelSubscriptionResponse.java
rename to src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCancelSubscriptionResponse.java
index aa348b8d..b253de87 100644
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCancelSubscriptionResponse.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCancelSubscriptionResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.estimate;
+package com.chargebee.v4.models.estimate.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateChangeTermEndResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateChangeTermEndResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/estimate/EstimateChangeTermEndResponse.java
rename to src/main/java/com/chargebee/v4/models/estimate/responses/EstimateChangeTermEndResponse.java
index 54ee15b9..9a7d390d 100644
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateChangeTermEndResponse.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateChangeTermEndResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.estimate;
+package com.chargebee.v4.models.estimate.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateInvoiceForItemsResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCreateInvoiceForItemsResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateInvoiceForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCreateInvoiceForItemsResponse.java
index fd2c9f67..c4b2c599 100644
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateInvoiceForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCreateInvoiceForItemsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.estimate;
+package com.chargebee.v4.models.estimate.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateInvoiceResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCreateInvoiceResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateInvoiceResponse.java
rename to src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCreateInvoiceResponse.java
index 9cc0c730..7ac827a3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateInvoiceResponse.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCreateInvoiceResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.estimate;
+package com.chargebee.v4.models.estimate.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCreateSubscriptionResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateSubscriptionResponse.java
rename to src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCreateSubscriptionResponse.java
index 35ffe41f..e5a31d99 100644
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateCreateSubscriptionResponse.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateCreateSubscriptionResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.estimate;
+package com.chargebee.v4.models.estimate.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateGiftSubscriptionForItemsResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateGiftSubscriptionForItemsResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/estimate/EstimateGiftSubscriptionForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/estimate/responses/EstimateGiftSubscriptionForItemsResponse.java
index 87b7bd9a..28da1823 100644
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateGiftSubscriptionForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateGiftSubscriptionForItemsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.estimate;
+package com.chargebee.v4.models.estimate.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateGiftSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateGiftSubscriptionResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/estimate/EstimateGiftSubscriptionResponse.java
rename to src/main/java/com/chargebee/v4/models/estimate/responses/EstimateGiftSubscriptionResponse.java
index 23141980..25b96dc1 100644
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateGiftSubscriptionResponse.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateGiftSubscriptionResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.estimate;
+package com.chargebee.v4.models.estimate.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimatePauseSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimatePauseSubscriptionResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/estimate/EstimatePauseSubscriptionResponse.java
rename to src/main/java/com/chargebee/v4/models/estimate/responses/EstimatePauseSubscriptionResponse.java
index 2444b51a..2b858001 100644
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimatePauseSubscriptionResponse.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimatePauseSubscriptionResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.estimate;
+package com.chargebee.v4.models.estimate.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimatePaymentSchedulesResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimatePaymentSchedulesResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/estimate/EstimatePaymentSchedulesResponse.java
rename to src/main/java/com/chargebee/v4/models/estimate/responses/EstimatePaymentSchedulesResponse.java
index 90fdbd25..475cde51 100644
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimatePaymentSchedulesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimatePaymentSchedulesResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.estimate;
+package com.chargebee.v4.models.estimate.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateResumeSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateResumeSubscriptionResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/estimate/EstimateResumeSubscriptionResponse.java
rename to src/main/java/com/chargebee/v4/models/estimate/responses/EstimateResumeSubscriptionResponse.java
index d387916d..e2785e95 100644
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateResumeSubscriptionResponse.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateResumeSubscriptionResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.estimate;
+package com.chargebee.v4.models.estimate.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateUpdateSubscriptionForItemsResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateUpdateSubscriptionForItemsResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/estimate/EstimateUpdateSubscriptionForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/estimate/responses/EstimateUpdateSubscriptionForItemsResponse.java
index afd2aa01..8d6d2311 100644
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateUpdateSubscriptionForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateUpdateSubscriptionForItemsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.estimate;
+package com.chargebee.v4.models.estimate.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateUpdateSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateUpdateSubscriptionResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/estimate/EstimateUpdateSubscriptionResponse.java
rename to src/main/java/com/chargebee/v4/models/estimate/responses/EstimateUpdateSubscriptionResponse.java
index fe6630a2..ff8443a7 100644
--- a/src/main/java/com/chargebee/v4/core/responses/estimate/EstimateUpdateSubscriptionResponse.java
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/EstimateUpdateSubscriptionResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.estimate;
+package com.chargebee.v4.models.estimate.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/estimate/responses/RegenerateInvoiceEstimateResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/RegenerateInvoiceEstimateResponse.java
new file mode 100644
index 00000000..8c0f6017
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/RegenerateInvoiceEstimateResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.estimate.responses;
+
+import com.chargebee.v4.models.estimate.Estimate;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for RegenerateInvoiceEstimate operation. Contains the response data
+ * from the API.
+ */
+public final class RegenerateInvoiceEstimateResponse extends BaseResponse {
+  private final Estimate estimate;
+
+  private RegenerateInvoiceEstimateResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.estimate = builder.estimate;
+  }
+
+  /** Parse JSON response into RegenerateInvoiceEstimateResponse object. */
+  public static RegenerateInvoiceEstimateResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into RegenerateInvoiceEstimateResponse object with HTTP response. */
+  public static RegenerateInvoiceEstimateResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __estimateJson = JsonUtil.getObject(json, "estimate");
+      if (__estimateJson != null) {
+        builder.estimate(Estimate.fromJson(__estimateJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse RegenerateInvoiceEstimateResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for RegenerateInvoiceEstimateResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for RegenerateInvoiceEstimateResponse. */
+  public static class Builder {
+
+    private Estimate estimate;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder estimate(Estimate estimate) {
+      this.estimate = estimate;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public RegenerateInvoiceEstimateResponse build() {
+      return new RegenerateInvoiceEstimateResponse(this);
+    }
+  }
+
+  /** Get the estimate from the response. */
+  public Estimate getEstimate() {
+    return estimate;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/responses/RenewalEstimateResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/RenewalEstimateResponse.java
new file mode 100644
index 00000000..0df95276
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/RenewalEstimateResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.estimate.responses;
+
+import com.chargebee.v4.models.estimate.Estimate;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for RenewalEstimate operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class RenewalEstimateResponse extends BaseResponse {
+  private final Estimate estimate;
+
+  private RenewalEstimateResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.estimate = builder.estimate;
+  }
+
+  /** Parse JSON response into RenewalEstimateResponse object. */
+  public static RenewalEstimateResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into RenewalEstimateResponse object with HTTP response. */
+  public static RenewalEstimateResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __estimateJson = JsonUtil.getObject(json, "estimate");
+      if (__estimateJson != null) {
+        builder.estimate(Estimate.fromJson(__estimateJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse RenewalEstimateResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for RenewalEstimateResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for RenewalEstimateResponse. */
+  public static class Builder {
+
+    private Estimate estimate;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder estimate(Estimate estimate) {
+      this.estimate = estimate;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public RenewalEstimateResponse build() {
+      return new RenewalEstimateResponse(this);
+    }
+  }
+
+  /** Get the estimate from the response. */
+  public Estimate getEstimate() {
+    return estimate;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/estimate/responses/UpcomingInvoicesEstimateResponse.java b/src/main/java/com/chargebee/v4/models/estimate/responses/UpcomingInvoicesEstimateResponse.java
new file mode 100644
index 00000000..b673ae3d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/estimate/responses/UpcomingInvoicesEstimateResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.estimate.responses;
+
+import com.chargebee.v4.models.estimate.Estimate;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for UpcomingInvoicesEstimate operation. Contains the response data from
+ * a single resource get operation.
+ */
+public final class UpcomingInvoicesEstimateResponse extends BaseResponse {
+  private final Estimate estimate;
+
+  private UpcomingInvoicesEstimateResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.estimate = builder.estimate;
+  }
+
+  /** Parse JSON response into UpcomingInvoicesEstimateResponse object. */
+  public static UpcomingInvoicesEstimateResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into UpcomingInvoicesEstimateResponse object with HTTP response. */
+  public static UpcomingInvoicesEstimateResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __estimateJson = JsonUtil.getObject(json, "estimate");
+      if (__estimateJson != null) {
+        builder.estimate(Estimate.fromJson(__estimateJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse UpcomingInvoicesEstimateResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for UpcomingInvoicesEstimateResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for UpcomingInvoicesEstimateResponse. */
+  public static class Builder {
+
+    private Estimate estimate;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder estimate(Estimate estimate) {
+      this.estimate = estimate;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public UpcomingInvoicesEstimateResponse build() {
+      return new UpcomingInvoicesEstimateResponse(this);
+    }
+  }
+
+  /** Get the estimate from the response. */
+  public Estimate getEstimate() {
+    return estimate;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/addUsagesReminderEvent/AddUsagesReminderEvent.java b/src/main/java/com/chargebee/v4/models/event/AddUsagesReminderEvent.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/addUsagesReminderEvent/AddUsagesReminderEvent.java
rename to src/main/java/com/chargebee/v4/models/event/AddUsagesReminderEvent.java
index e0655e56..50b39563 100644
--- a/src/main/java/com/chargebee/v4/core/models/addUsagesReminderEvent/AddUsagesReminderEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/AddUsagesReminderEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.addUsagesReminderEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.usageReminderInfo.UsageReminderInfo;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.usageReminderInfo.UsageReminderInfo;
 
 public class AddUsagesReminderEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/addonCreatedEvent/AddonCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/AddonCreatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/addonCreatedEvent/AddonCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/AddonCreatedEvent.java
index cc7be541..5d53da54 100644
--- a/src/main/java/com/chargebee/v4/core/models/addonCreatedEvent/AddonCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/AddonCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.addonCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.addon.Addon;
+import com.chargebee.v4.models.addon.Addon;
 
 public class AddonCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/addonDeletedEvent/AddonDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/AddonDeletedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/addonDeletedEvent/AddonDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/AddonDeletedEvent.java
index 5c2b9cd7..4ec76f25 100644
--- a/src/main/java/com/chargebee/v4/core/models/addonDeletedEvent/AddonDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/AddonDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.addonDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.addon.Addon;
+import com.chargebee.v4.models.addon.Addon;
 
 public class AddonDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/addonUpdatedEvent/AddonUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/AddonUpdatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/addonUpdatedEvent/AddonUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/AddonUpdatedEvent.java
index d8abdcc5..4904e669 100644
--- a/src/main/java/com/chargebee/v4/core/models/addonUpdatedEvent/AddonUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/AddonUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.addonUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.addon.Addon;
+import com.chargebee.v4.models.addon.Addon;
 
 public class AddonUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/attachedItemCreatedEvent/AttachedItemCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/AttachedItemCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/attachedItemCreatedEvent/AttachedItemCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/AttachedItemCreatedEvent.java
index e115b244..3aaacee6 100644
--- a/src/main/java/com/chargebee/v4/core/models/attachedItemCreatedEvent/AttachedItemCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/AttachedItemCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.attachedItemCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.attachedItem.AttachedItem;
+import com.chargebee.v4.models.attachedItem.AttachedItem;
 
 public class AttachedItemCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/attachedItemDeletedEvent/AttachedItemDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/AttachedItemDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/attachedItemDeletedEvent/AttachedItemDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/AttachedItemDeletedEvent.java
index 7155ec22..294398ba 100644
--- a/src/main/java/com/chargebee/v4/core/models/attachedItemDeletedEvent/AttachedItemDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/AttachedItemDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.attachedItemDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.attachedItem.AttachedItem;
+import com.chargebee.v4.models.attachedItem.AttachedItem;
 
 public class AttachedItemDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/attachedItemUpdatedEvent/AttachedItemUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/AttachedItemUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/attachedItemUpdatedEvent/AttachedItemUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/AttachedItemUpdatedEvent.java
index 96917aeb..62657d80 100644
--- a/src/main/java/com/chargebee/v4/core/models/attachedItemUpdatedEvent/AttachedItemUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/AttachedItemUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.attachedItemUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.attachedItem.AttachedItem;
+import com.chargebee.v4.models.attachedItem.AttachedItem;
 
 public class AttachedItemUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/authorizationSucceededEvent/AuthorizationSucceededEvent.java b/src/main/java/com/chargebee/v4/models/event/AuthorizationSucceededEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/authorizationSucceededEvent/AuthorizationSucceededEvent.java
rename to src/main/java/com/chargebee/v4/models/event/AuthorizationSucceededEvent.java
index ded4ce7a..487175df 100644
--- a/src/main/java/com/chargebee/v4/core/models/authorizationSucceededEvent/AuthorizationSucceededEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/AuthorizationSucceededEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.authorizationSucceededEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
 public class AuthorizationSucceededEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/authorizationVoidedEvent/AuthorizationVoidedEvent.java b/src/main/java/com/chargebee/v4/models/event/AuthorizationVoidedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/authorizationVoidedEvent/AuthorizationVoidedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/AuthorizationVoidedEvent.java
index a297ed6c..b1b1fe2a 100644
--- a/src/main/java/com/chargebee/v4/core/models/authorizationVoidedEvent/AuthorizationVoidedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/AuthorizationVoidedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.authorizationVoidedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
 public class AuthorizationVoidedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/businessEntityCreatedEvent/BusinessEntityCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/BusinessEntityCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/businessEntityCreatedEvent/BusinessEntityCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/BusinessEntityCreatedEvent.java
index 9438ff84..3627eaea 100644
--- a/src/main/java/com/chargebee/v4/core/models/businessEntityCreatedEvent/BusinessEntityCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/BusinessEntityCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.businessEntityCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.businessEntity.BusinessEntity;
+import com.chargebee.v4.models.businessEntity.BusinessEntity;
 
 public class BusinessEntityCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/businessEntityDeletedEvent/BusinessEntityDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/BusinessEntityDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/businessEntityDeletedEvent/BusinessEntityDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/BusinessEntityDeletedEvent.java
index a1311a51..600e4f40 100644
--- a/src/main/java/com/chargebee/v4/core/models/businessEntityDeletedEvent/BusinessEntityDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/BusinessEntityDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.businessEntityDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.businessEntity.BusinessEntity;
+import com.chargebee.v4.models.businessEntity.BusinessEntity;
 
 public class BusinessEntityDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/businessEntityUpdatedEvent/BusinessEntityUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/BusinessEntityUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/businessEntityUpdatedEvent/BusinessEntityUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/BusinessEntityUpdatedEvent.java
index b9271966..a7eb0452 100644
--- a/src/main/java/com/chargebee/v4/core/models/businessEntityUpdatedEvent/BusinessEntityUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/BusinessEntityUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.businessEntityUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.businessEntity.BusinessEntity;
+import com.chargebee.v4.models.businessEntity.BusinessEntity;
 
 public class BusinessEntityUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/cardAddedEvent/CardAddedEvent.java b/src/main/java/com/chargebee/v4/models/event/CardAddedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/cardAddedEvent/CardAddedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CardAddedEvent.java
index f5b54bc7..565e67df 100644
--- a/src/main/java/com/chargebee/v4/core/models/cardAddedEvent/CardAddedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CardAddedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.cardAddedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
 public class CardAddedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/cardDeletedEvent/CardDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/CardDeletedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/cardDeletedEvent/CardDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CardDeletedEvent.java
index 15777664..adf958e8 100644
--- a/src/main/java/com/chargebee/v4/core/models/cardDeletedEvent/CardDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CardDeletedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.cardDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
 public class CardDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/cardExpiredEvent/CardExpiredEvent.java b/src/main/java/com/chargebee/v4/models/event/CardExpiredEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/cardExpiredEvent/CardExpiredEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CardExpiredEvent.java
index 55026168..24127810 100644
--- a/src/main/java/com/chargebee/v4/core/models/cardExpiredEvent/CardExpiredEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CardExpiredEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.cardExpiredEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
 public class CardExpiredEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/cardExpiryReminderEvent/CardExpiryReminderEvent.java b/src/main/java/com/chargebee/v4/models/event/CardExpiryReminderEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/cardExpiryReminderEvent/CardExpiryReminderEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CardExpiryReminderEvent.java
index ac34c143..d82aeb15 100644
--- a/src/main/java/com/chargebee/v4/core/models/cardExpiryReminderEvent/CardExpiryReminderEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CardExpiryReminderEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.cardExpiryReminderEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
 public class CardExpiryReminderEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/cardUpdatedEvent/CardUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/CardUpdatedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/cardUpdatedEvent/CardUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CardUpdatedEvent.java
index b9dc2733..df0f86cd 100644
--- a/src/main/java/com/chargebee/v4/core/models/cardUpdatedEvent/CardUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CardUpdatedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.cardUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
 public class CardUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/contractTermCancelledEvent/ContractTermCancelledEvent.java b/src/main/java/com/chargebee/v4/models/event/ContractTermCancelledEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/contractTermCancelledEvent/ContractTermCancelledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ContractTermCancelledEvent.java
index 9dd16d5a..cf4c77f0 100644
--- a/src/main/java/com/chargebee/v4/core/models/contractTermCancelledEvent/ContractTermCancelledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ContractTermCancelledEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.contractTermCancelledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.contractTerm.ContractTerm;
+import com.chargebee.v4.models.contractTerm.ContractTerm;
 
 public class ContractTermCancelledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/contractTermCompletedEvent/ContractTermCompletedEvent.java b/src/main/java/com/chargebee/v4/models/event/ContractTermCompletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/contractTermCompletedEvent/ContractTermCompletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ContractTermCompletedEvent.java
index c0f2292b..b93645c8 100644
--- a/src/main/java/com/chargebee/v4/core/models/contractTermCompletedEvent/ContractTermCompletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ContractTermCompletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.contractTermCompletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.contractTerm.ContractTerm;
+import com.chargebee.v4.models.contractTerm.ContractTerm;
 
 public class ContractTermCompletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/contractTermCreatedEvent/ContractTermCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/ContractTermCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/contractTermCreatedEvent/ContractTermCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ContractTermCreatedEvent.java
index 86d52d5d..76d587ae 100644
--- a/src/main/java/com/chargebee/v4/core/models/contractTermCreatedEvent/ContractTermCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ContractTermCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.contractTermCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.contractTerm.ContractTerm;
+import com.chargebee.v4.models.contractTerm.ContractTerm;
 
 public class ContractTermCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/contractTermRenewedEvent/ContractTermRenewedEvent.java b/src/main/java/com/chargebee/v4/models/event/ContractTermRenewedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/contractTermRenewedEvent/ContractTermRenewedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ContractTermRenewedEvent.java
index 4672ccba..7bf11e18 100644
--- a/src/main/java/com/chargebee/v4/core/models/contractTermRenewedEvent/ContractTermRenewedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ContractTermRenewedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.contractTermRenewedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.contractTerm.ContractTerm;
+import com.chargebee.v4.models.contractTerm.ContractTerm;
 
 public class ContractTermRenewedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/contractTermTerminatedEvent/ContractTermTerminatedEvent.java b/src/main/java/com/chargebee/v4/models/event/ContractTermTerminatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/contractTermTerminatedEvent/ContractTermTerminatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ContractTermTerminatedEvent.java
index 4232f5a8..86500a84 100644
--- a/src/main/java/com/chargebee/v4/core/models/contractTermTerminatedEvent/ContractTermTerminatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ContractTermTerminatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.contractTermTerminatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.contractTerm.ContractTerm;
+import com.chargebee.v4.models.contractTerm.ContractTerm;
 
 public class ContractTermTerminatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponCodesAddedEvent/CouponCodesAddedEvent.java b/src/main/java/com/chargebee/v4/models/event/CouponCodesAddedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/couponCodesAddedEvent/CouponCodesAddedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CouponCodesAddedEvent.java
index a19402b3..e0eadd89 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponCodesAddedEvent/CouponCodesAddedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CouponCodesAddedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponCodesAddedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.couponSet.CouponSet;
 
-import com.chargebee.v4.core.models.couponSet.CouponSet;
+import com.chargebee.v4.models.coupon.Coupon;
 
 public class CouponCodesAddedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponCodesDeletedEvent/CouponCodesDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/CouponCodesDeletedEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/couponCodesDeletedEvent/CouponCodesDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CouponCodesDeletedEvent.java
index 02a80353..35523cce 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponCodesDeletedEvent/CouponCodesDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CouponCodesDeletedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponCodesDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.couponSet.CouponSet;
 
-import com.chargebee.v4.core.models.couponSet.CouponSet;
+import com.chargebee.v4.models.couponCode.CouponCode;
 
-import com.chargebee.v4.core.models.couponCode.CouponCode;
+import com.chargebee.v4.models.coupon.Coupon;
 
 public class CouponCodesDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponCodesUpdatedEvent/CouponCodesUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/CouponCodesUpdatedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/couponCodesUpdatedEvent/CouponCodesUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CouponCodesUpdatedEvent.java
index b0aab530..7d0fb32c 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponCodesUpdatedEvent/CouponCodesUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CouponCodesUpdatedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponCodesUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.couponSet.CouponSet;
 
-import com.chargebee.v4.core.models.couponSet.CouponSet;
+import com.chargebee.v4.models.coupon.Coupon;
 
 public class CouponCodesUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponCreatedEvent/CouponCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/CouponCreatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/couponCreatedEvent/CouponCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CouponCreatedEvent.java
index 771c554d..5165f385 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponCreatedEvent/CouponCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CouponCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.coupon.Coupon;
 
 public class CouponCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponDeletedEvent/CouponDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/CouponDeletedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/couponDeletedEvent/CouponDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CouponDeletedEvent.java
index e076f77a..f41d84b2 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponDeletedEvent/CouponDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CouponDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.coupon.Coupon;
 
 public class CouponDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponSetCreatedEvent/CouponSetCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/CouponSetCreatedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/couponSetCreatedEvent/CouponSetCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CouponSetCreatedEvent.java
index 747f4626..b6483f39 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponSetCreatedEvent/CouponSetCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CouponSetCreatedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponSetCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.couponSet.CouponSet;
 
-import com.chargebee.v4.core.models.couponSet.CouponSet;
+import com.chargebee.v4.models.coupon.Coupon;
 
 public class CouponSetCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponSetDeletedEvent/CouponSetDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/CouponSetDeletedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/couponSetDeletedEvent/CouponSetDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CouponSetDeletedEvent.java
index 1fab75f3..5675b663 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponSetDeletedEvent/CouponSetDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CouponSetDeletedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponSetDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.couponSet.CouponSet;
 
-import com.chargebee.v4.core.models.couponSet.CouponSet;
+import com.chargebee.v4.models.coupon.Coupon;
 
 public class CouponSetDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponSetUpdatedEvent/CouponSetUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/CouponSetUpdatedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/couponSetUpdatedEvent/CouponSetUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CouponSetUpdatedEvent.java
index b3329de8..9aa3029b 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponSetUpdatedEvent/CouponSetUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CouponSetUpdatedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponSetUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.couponSet.CouponSet;
 
-import com.chargebee.v4.core.models.couponSet.CouponSet;
+import com.chargebee.v4.models.coupon.Coupon;
 
 public class CouponSetUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/couponUpdatedEvent/CouponUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/CouponUpdatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/couponUpdatedEvent/CouponUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CouponUpdatedEvent.java
index cc6ae24d..4414dd01 100644
--- a/src/main/java/com/chargebee/v4/core/models/couponUpdatedEvent/CouponUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CouponUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.couponUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.coupon.Coupon;
+import com.chargebee.v4.models.coupon.Coupon;
 
 public class CouponUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNoteCreatedEvent/CreditNoteCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/CreditNoteCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/creditNoteCreatedEvent/CreditNoteCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CreditNoteCreatedEvent.java
index e5915958..9d6bbf16 100644
--- a/src/main/java/com/chargebee/v4/core/models/creditNoteCreatedEvent/CreditNoteCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CreditNoteCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.creditNoteCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
 public class CreditNoteCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNoteCreatedWithBackdatingEvent/CreditNoteCreatedWithBackdatingEvent.java b/src/main/java/com/chargebee/v4/models/event/CreditNoteCreatedWithBackdatingEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/creditNoteCreatedWithBackdatingEvent/CreditNoteCreatedWithBackdatingEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CreditNoteCreatedWithBackdatingEvent.java
index 15c799ff..5a108c3b 100644
--- a/src/main/java/com/chargebee/v4/core/models/creditNoteCreatedWithBackdatingEvent/CreditNoteCreatedWithBackdatingEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CreditNoteCreatedWithBackdatingEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.creditNoteCreatedWithBackdatingEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
 public class CreditNoteCreatedWithBackdatingEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNoteDeletedEvent/CreditNoteDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/CreditNoteDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/creditNoteDeletedEvent/CreditNoteDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CreditNoteDeletedEvent.java
index b9c1cd28..5c09db77 100644
--- a/src/main/java/com/chargebee/v4/core/models/creditNoteDeletedEvent/CreditNoteDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CreditNoteDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.creditNoteDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
 public class CreditNoteDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/creditNoteUpdatedEvent/CreditNoteUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/CreditNoteUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/creditNoteUpdatedEvent/CreditNoteUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CreditNoteUpdatedEvent.java
index 3bc93340..ca298feb 100644
--- a/src/main/java/com/chargebee/v4/core/models/creditNoteUpdatedEvent/CreditNoteUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CreditNoteUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.creditNoteUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
 public class CreditNoteUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/customerBusinessEntityChangedEvent/CustomerBusinessEntityChangedEvent.java b/src/main/java/com/chargebee/v4/models/event/CustomerBusinessEntityChangedEvent.java
similarity index 78%
rename from src/main/java/com/chargebee/v4/core/models/customerBusinessEntityChangedEvent/CustomerBusinessEntityChangedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CustomerBusinessEntityChangedEvent.java
index 962eebbd..bf6a4316 100644
--- a/src/main/java/com/chargebee/v4/core/models/customerBusinessEntityChangedEvent/CustomerBusinessEntityChangedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CustomerBusinessEntityChangedEvent.java
@@ -5,15 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customerBusinessEntityChangedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.businessEntityChange.BusinessEntityChange;
-
-import com.chargebee.v4.core.models.businessEntityTransfer.BusinessEntityTransfer;
+import com.chargebee.v4.models.businessEntityTransfer.BusinessEntityTransfer;
 
 public class CustomerBusinessEntityChangedEvent {
 
@@ -85,14 +83,9 @@ public static CustomerBusinessEntityChangedEvent fromJson(String json) {
 
   public static class Content {
 
-    private BusinessEntityChange businessEntityChange;
     private BusinessEntityTransfer businessEntityTransfer;
     private Customer customer;
 
-    public BusinessEntityChange getBusinessEntityChange() {
-      return businessEntityChange;
-    }
-
     public BusinessEntityTransfer getBusinessEntityTransfer() {
       return businessEntityTransfer;
     }
@@ -104,11 +97,6 @@ public Customer getCustomer() {
     public static Content fromJson(String json) {
       Content obj = new Content();
 
-      String __businessEntityChangeJson = JsonUtil.getObject(json, "business_entity_change");
-      if (__businessEntityChangeJson != null) {
-        obj.businessEntityChange = BusinessEntityChange.fromJson(__businessEntityChangeJson);
-      }
-
       String __businessEntityTransferJson = JsonUtil.getObject(json, "business_entity_transfer");
       if (__businessEntityTransferJson != null) {
         obj.businessEntityTransfer = BusinessEntityTransfer.fromJson(__businessEntityTransferJson);
diff --git a/src/main/java/com/chargebee/v4/core/models/customerChangedEvent/CustomerChangedEvent.java b/src/main/java/com/chargebee/v4/models/event/CustomerChangedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/customerChangedEvent/CustomerChangedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CustomerChangedEvent.java
index 25c22114..f21bd596 100644
--- a/src/main/java/com/chargebee/v4/core/models/customerChangedEvent/CustomerChangedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CustomerChangedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customerChangedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
 public class CustomerChangedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/customerCreatedEvent/CustomerCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/CustomerCreatedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/customerCreatedEvent/CustomerCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CustomerCreatedEvent.java
index 3bea88ec..99b540e8 100644
--- a/src/main/java/com/chargebee/v4/core/models/customerCreatedEvent/CustomerCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CustomerCreatedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customerCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
 public class CustomerCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/customerDeletedEvent/CustomerDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/CustomerDeletedEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/customerDeletedEvent/CustomerDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CustomerDeletedEvent.java
index 4bb406ae..b823eefa 100644
--- a/src/main/java/com/chargebee/v4/core/models/customerDeletedEvent/CustomerDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CustomerDeletedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customerDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
 public class CustomerDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/customerEntitlementsUpdatedEvent/CustomerEntitlementsUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/CustomerEntitlementsUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/customerEntitlementsUpdatedEvent/CustomerEntitlementsUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CustomerEntitlementsUpdatedEvent.java
index 44929d03..702dabe8 100644
--- a/src/main/java/com/chargebee/v4/core/models/customerEntitlementsUpdatedEvent/CustomerEntitlementsUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CustomerEntitlementsUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customerEntitlementsUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.impactedCustomer.ImpactedCustomer;
+import com.chargebee.v4.models.impactedCustomer.ImpactedCustomer;
 
 public class CustomerEntitlementsUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/customerMovedInEvent/CustomerMovedInEvent.java b/src/main/java/com/chargebee/v4/models/event/CustomerMovedInEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/customerMovedInEvent/CustomerMovedInEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CustomerMovedInEvent.java
index 26e19382..99fb5495 100644
--- a/src/main/java/com/chargebee/v4/core/models/customerMovedInEvent/CustomerMovedInEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CustomerMovedInEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customerMovedInEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
 public class CustomerMovedInEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/customerMovedOutEvent/CustomerMovedOutEvent.java b/src/main/java/com/chargebee/v4/models/event/CustomerMovedOutEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/customerMovedOutEvent/CustomerMovedOutEvent.java
rename to src/main/java/com/chargebee/v4/models/event/CustomerMovedOutEvent.java
index 575c436e..5f1dc646 100644
--- a/src/main/java/com/chargebee/v4/core/models/customerMovedOutEvent/CustomerMovedOutEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/CustomerMovedOutEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.customerMovedOutEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
 public class CustomerMovedOutEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/differentialPriceCreatedEvent/DifferentialPriceCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/DifferentialPriceCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/differentialPriceCreatedEvent/DifferentialPriceCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/DifferentialPriceCreatedEvent.java
index f3f852ee..a00ce00e 100644
--- a/src/main/java/com/chargebee/v4/core/models/differentialPriceCreatedEvent/DifferentialPriceCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/DifferentialPriceCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.differentialPriceCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.differentialPrice.DifferentialPrice;
+import com.chargebee.v4.models.differentialPrice.DifferentialPrice;
 
 public class DifferentialPriceCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/differentialPriceDeletedEvent/DifferentialPriceDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/DifferentialPriceDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/differentialPriceDeletedEvent/DifferentialPriceDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/DifferentialPriceDeletedEvent.java
index 048b486c..94117d0c 100644
--- a/src/main/java/com/chargebee/v4/core/models/differentialPriceDeletedEvent/DifferentialPriceDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/DifferentialPriceDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.differentialPriceDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.differentialPrice.DifferentialPrice;
+import com.chargebee.v4.models.differentialPrice.DifferentialPrice;
 
 public class DifferentialPriceDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/differentialPriceUpdatedEvent/DifferentialPriceUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/DifferentialPriceUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/differentialPriceUpdatedEvent/DifferentialPriceUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/DifferentialPriceUpdatedEvent.java
index 58b9e73a..e8471da3 100644
--- a/src/main/java/com/chargebee/v4/core/models/differentialPriceUpdatedEvent/DifferentialPriceUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/DifferentialPriceUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.differentialPriceUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.differentialPrice.DifferentialPrice;
+import com.chargebee.v4.models.differentialPrice.DifferentialPrice;
 
 public class DifferentialPriceUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/dunningUpdatedEvent/DunningUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/DunningUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/dunningUpdatedEvent/DunningUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/DunningUpdatedEvent.java
index 3702967d..a919ef71 100644
--- a/src/main/java/com/chargebee/v4/core/models/dunningUpdatedEvent/DunningUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/DunningUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.dunningUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class DunningUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/entitlementOverridesAutoRemovedEvent/EntitlementOverridesAutoRemovedEvent.java b/src/main/java/com/chargebee/v4/models/event/EntitlementOverridesAutoRemovedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/entitlementOverridesAutoRemovedEvent/EntitlementOverridesAutoRemovedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/EntitlementOverridesAutoRemovedEvent.java
index 59e1c9d1..ef2489e3 100644
--- a/src/main/java/com/chargebee/v4/core/models/entitlementOverridesAutoRemovedEvent/EntitlementOverridesAutoRemovedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/EntitlementOverridesAutoRemovedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.entitlementOverridesAutoRemovedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.impactedItem.ImpactedItem;
+import com.chargebee.v4.models.impactedItem.ImpactedItem;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.metadata.Metadata;
 
-import com.chargebee.v4.core.models.impactedSubscription.ImpactedSubscription;
+import com.chargebee.v4.models.impactedSubscription.ImpactedSubscription;
 
-import com.chargebee.v4.core.models.metadata.Metadata;
+import com.chargebee.v4.models.feature.Feature;
 
 public class EntitlementOverridesAutoRemovedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/entitlementOverridesRemovedEvent/EntitlementOverridesRemovedEvent.java b/src/main/java/com/chargebee/v4/models/event/EntitlementOverridesRemovedEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/entitlementOverridesRemovedEvent/EntitlementOverridesRemovedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/EntitlementOverridesRemovedEvent.java
index 67bac305..30eebeb5 100644
--- a/src/main/java/com/chargebee/v4/core/models/entitlementOverridesRemovedEvent/EntitlementOverridesRemovedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/EntitlementOverridesRemovedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.entitlementOverridesRemovedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.impactedSubscription.ImpactedSubscription;
+import com.chargebee.v4.models.metadata.Metadata;
 
-import com.chargebee.v4.core.models.metadata.Metadata;
+import com.chargebee.v4.models.impactedSubscription.ImpactedSubscription;
 
 public class EntitlementOverridesRemovedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/entitlementOverridesUpdatedEvent/EntitlementOverridesUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/EntitlementOverridesUpdatedEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/entitlementOverridesUpdatedEvent/EntitlementOverridesUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/EntitlementOverridesUpdatedEvent.java
index 3967a10d..ab88eeb7 100644
--- a/src/main/java/com/chargebee/v4/core/models/entitlementOverridesUpdatedEvent/EntitlementOverridesUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/EntitlementOverridesUpdatedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.entitlementOverridesUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.impactedSubscription.ImpactedSubscription;
+import com.chargebee.v4.models.metadata.Metadata;
 
-import com.chargebee.v4.core.models.metadata.Metadata;
+import com.chargebee.v4.models.impactedSubscription.ImpactedSubscription;
 
 public class EntitlementOverridesUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/event/Event.java b/src/main/java/com/chargebee/v4/models/event/Event.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/event/Event.java
rename to src/main/java/com/chargebee/v4/models/event/Event.java
index 0067314a..e63bf73c 100644
--- a/src/main/java/com/chargebee/v4/core/models/event/Event.java
+++ b/src/main/java/com/chargebee/v4/models/event/Event.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.event;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/featureActivatedEvent/FeatureActivatedEvent.java b/src/main/java/com/chargebee/v4/models/event/FeatureActivatedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/featureActivatedEvent/FeatureActivatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/FeatureActivatedEvent.java
index 97f9855a..f48e1609 100644
--- a/src/main/java/com/chargebee/v4/core/models/featureActivatedEvent/FeatureActivatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/FeatureActivatedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.featureActivatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.impactedItem.ImpactedItem;
+import com.chargebee.v4.models.impactedItem.ImpactedItem;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.metadata.Metadata;
 
-import com.chargebee.v4.core.models.impactedSubscription.ImpactedSubscription;
+import com.chargebee.v4.models.impactedSubscription.ImpactedSubscription;
 
-import com.chargebee.v4.core.models.metadata.Metadata;
+import com.chargebee.v4.models.feature.Feature;
 
 public class FeatureActivatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/featureArchivedEvent/FeatureArchivedEvent.java b/src/main/java/com/chargebee/v4/models/event/FeatureArchivedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/featureArchivedEvent/FeatureArchivedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/FeatureArchivedEvent.java
index 59ebbe52..cf845d76 100644
--- a/src/main/java/com/chargebee/v4/core/models/featureArchivedEvent/FeatureArchivedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/FeatureArchivedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.featureArchivedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.metadata.Metadata;
 
-import com.chargebee.v4.core.models.metadata.Metadata;
+import com.chargebee.v4.models.feature.Feature;
 
 public class FeatureArchivedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/featureCreatedEvent/FeatureCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/FeatureCreatedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/featureCreatedEvent/FeatureCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/FeatureCreatedEvent.java
index 3cbebded..84286959 100644
--- a/src/main/java/com/chargebee/v4/core/models/featureCreatedEvent/FeatureCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/FeatureCreatedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.featureCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.impactedItem.ImpactedItem;
+import com.chargebee.v4.models.impactedItem.ImpactedItem;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.metadata.Metadata;
 
-import com.chargebee.v4.core.models.impactedSubscription.ImpactedSubscription;
+import com.chargebee.v4.models.impactedSubscription.ImpactedSubscription;
 
-import com.chargebee.v4.core.models.metadata.Metadata;
+import com.chargebee.v4.models.feature.Feature;
 
 public class FeatureCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/featureDeletedEvent/FeatureDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/FeatureDeletedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/featureDeletedEvent/FeatureDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/FeatureDeletedEvent.java
index 92f687a9..106c08fd 100644
--- a/src/main/java/com/chargebee/v4/core/models/featureDeletedEvent/FeatureDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/FeatureDeletedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.featureDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.impactedItem.ImpactedItem;
+import com.chargebee.v4.models.impactedItem.ImpactedItem;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.metadata.Metadata;
 
-import com.chargebee.v4.core.models.impactedSubscription.ImpactedSubscription;
+import com.chargebee.v4.models.impactedSubscription.ImpactedSubscription;
 
-import com.chargebee.v4.core.models.metadata.Metadata;
+import com.chargebee.v4.models.feature.Feature;
 
 public class FeatureDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/featureReactivatedEvent/FeatureReactivatedEvent.java b/src/main/java/com/chargebee/v4/models/event/FeatureReactivatedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/featureReactivatedEvent/FeatureReactivatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/FeatureReactivatedEvent.java
index 3eea5baf..516b1775 100644
--- a/src/main/java/com/chargebee/v4/core/models/featureReactivatedEvent/FeatureReactivatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/FeatureReactivatedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.featureReactivatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.metadata.Metadata;
 
-import com.chargebee.v4.core.models.metadata.Metadata;
+import com.chargebee.v4.models.feature.Feature;
 
 public class FeatureReactivatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/featureUpdatedEvent/FeatureUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/FeatureUpdatedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/featureUpdatedEvent/FeatureUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/FeatureUpdatedEvent.java
index 4c4c69ab..91b0c121 100644
--- a/src/main/java/com/chargebee/v4/core/models/featureUpdatedEvent/FeatureUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/FeatureUpdatedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.featureUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.metadata.Metadata;
 
-import com.chargebee.v4.core.models.metadata.Metadata;
+import com.chargebee.v4.models.feature.Feature;
 
 public class FeatureUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/giftCancelledEvent/GiftCancelledEvent.java b/src/main/java/com/chargebee/v4/models/event/GiftCancelledEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/giftCancelledEvent/GiftCancelledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/GiftCancelledEvent.java
index 52ca9b5a..08dfbb82 100644
--- a/src/main/java/com/chargebee/v4/core/models/giftCancelledEvent/GiftCancelledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/GiftCancelledEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.giftCancelledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.gift.Gift;
+import com.chargebee.v4.models.gift.Gift;
 
 public class GiftCancelledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/giftClaimedEvent/GiftClaimedEvent.java b/src/main/java/com/chargebee/v4/models/event/GiftClaimedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/giftClaimedEvent/GiftClaimedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/GiftClaimedEvent.java
index 08a6927a..4e64c834 100644
--- a/src/main/java/com/chargebee/v4/core/models/giftClaimedEvent/GiftClaimedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/GiftClaimedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.giftClaimedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.gift.Gift;
+import com.chargebee.v4.models.gift.Gift;
 
 public class GiftClaimedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/giftExpiredEvent/GiftExpiredEvent.java b/src/main/java/com/chargebee/v4/models/event/GiftExpiredEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/giftExpiredEvent/GiftExpiredEvent.java
rename to src/main/java/com/chargebee/v4/models/event/GiftExpiredEvent.java
index 23b5473a..f60d2bb0 100644
--- a/src/main/java/com/chargebee/v4/core/models/giftExpiredEvent/GiftExpiredEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/GiftExpiredEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.giftExpiredEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.gift.Gift;
+import com.chargebee.v4.models.gift.Gift;
 
 public class GiftExpiredEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/giftScheduledEvent/GiftScheduledEvent.java b/src/main/java/com/chargebee/v4/models/event/GiftScheduledEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/giftScheduledEvent/GiftScheduledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/GiftScheduledEvent.java
index cff60be0..411da0ba 100644
--- a/src/main/java/com/chargebee/v4/core/models/giftScheduledEvent/GiftScheduledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/GiftScheduledEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.giftScheduledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.gift.Gift;
+import com.chargebee.v4.models.gift.Gift;
 
 public class GiftScheduledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/giftUnclaimedEvent/GiftUnclaimedEvent.java b/src/main/java/com/chargebee/v4/models/event/GiftUnclaimedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/giftUnclaimedEvent/GiftUnclaimedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/GiftUnclaimedEvent.java
index 84645775..95a50259 100644
--- a/src/main/java/com/chargebee/v4/core/models/giftUnclaimedEvent/GiftUnclaimedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/GiftUnclaimedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.giftUnclaimedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.gift.Gift;
+import com.chargebee.v4.models.gift.Gift;
 
 public class GiftUnclaimedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/giftUpdatedEvent/GiftUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/GiftUpdatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/giftUpdatedEvent/GiftUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/GiftUpdatedEvent.java
index 63c9d65d..8f036005 100644
--- a/src/main/java/com/chargebee/v4/core/models/giftUpdatedEvent/GiftUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/GiftUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.giftUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.gift.Gift;
+import com.chargebee.v4.models.gift.Gift;
 
 public class GiftUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/hierarchyCreatedEvent/HierarchyCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/HierarchyCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/hierarchyCreatedEvent/HierarchyCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/HierarchyCreatedEvent.java
index 9cad49e3..777da810 100644
--- a/src/main/java/com/chargebee/v4/core/models/hierarchyCreatedEvent/HierarchyCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/HierarchyCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.hierarchyCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
 public class HierarchyCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/hierarchyDeletedEvent/HierarchyDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/HierarchyDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/hierarchyDeletedEvent/HierarchyDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/HierarchyDeletedEvent.java
index 79aa6542..e2785836 100644
--- a/src/main/java/com/chargebee/v4/core/models/hierarchyDeletedEvent/HierarchyDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/HierarchyDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.hierarchyDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
 public class HierarchyDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/invoiceDeletedEvent/InvoiceDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/InvoiceDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/invoiceDeletedEvent/InvoiceDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/InvoiceDeletedEvent.java
index 6ccbd390..a86c1ada 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoiceDeletedEvent/InvoiceDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/InvoiceDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.invoiceDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class InvoiceDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/invoiceGeneratedEvent/InvoiceGeneratedEvent.java b/src/main/java/com/chargebee/v4/models/event/InvoiceGeneratedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/invoiceGeneratedEvent/InvoiceGeneratedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/InvoiceGeneratedEvent.java
index 170b68b1..16e1119e 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoiceGeneratedEvent/InvoiceGeneratedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/InvoiceGeneratedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.invoiceGeneratedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class InvoiceGeneratedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/invoiceGeneratedWithBackdatingEvent/InvoiceGeneratedWithBackdatingEvent.java b/src/main/java/com/chargebee/v4/models/event/InvoiceGeneratedWithBackdatingEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/invoiceGeneratedWithBackdatingEvent/InvoiceGeneratedWithBackdatingEvent.java
rename to src/main/java/com/chargebee/v4/models/event/InvoiceGeneratedWithBackdatingEvent.java
index e8be9499..89a07cee 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoiceGeneratedWithBackdatingEvent/InvoiceGeneratedWithBackdatingEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/InvoiceGeneratedWithBackdatingEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.invoiceGeneratedWithBackdatingEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class InvoiceGeneratedWithBackdatingEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/invoiceUpdatedEvent/InvoiceUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/InvoiceUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/invoiceUpdatedEvent/InvoiceUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/InvoiceUpdatedEvent.java
index 5f161a16..148bc3cc 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoiceUpdatedEvent/InvoiceUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/InvoiceUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.invoiceUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class InvoiceUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemCreatedEvent/ItemCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/ItemCreatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/itemCreatedEvent/ItemCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ItemCreatedEvent.java
index 3bc2e806..f8ca6dc9 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemCreatedEvent/ItemCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ItemCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.item.Item;
+import com.chargebee.v4.models.item.Item;
 
 public class ItemCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemDeletedEvent/ItemDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/ItemDeletedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/itemDeletedEvent/ItemDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ItemDeletedEvent.java
index 17960d5a..e7657162 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemDeletedEvent/ItemDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ItemDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.item.Item;
+import com.chargebee.v4.models.item.Item;
 
 public class ItemDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemEntitlementsRemovedEvent/ItemEntitlementsRemovedEvent.java b/src/main/java/com/chargebee/v4/models/event/ItemEntitlementsRemovedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/itemEntitlementsRemovedEvent/ItemEntitlementsRemovedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ItemEntitlementsRemovedEvent.java
index 0b2b34b8..6fe68cf9 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemEntitlementsRemovedEvent/ItemEntitlementsRemovedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ItemEntitlementsRemovedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemEntitlementsRemovedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.impactedItem.ImpactedItem;
+import com.chargebee.v4.models.impactedItem.ImpactedItem;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.metadata.Metadata;
 
-import com.chargebee.v4.core.models.impactedSubscription.ImpactedSubscription;
+import com.chargebee.v4.models.impactedSubscription.ImpactedSubscription;
 
-import com.chargebee.v4.core.models.metadata.Metadata;
+import com.chargebee.v4.models.feature.Feature;
 
 public class ItemEntitlementsRemovedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemEntitlementsUpdatedEvent/ItemEntitlementsUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/ItemEntitlementsUpdatedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/itemEntitlementsUpdatedEvent/ItemEntitlementsUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ItemEntitlementsUpdatedEvent.java
index fec0a630..792c95f9 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemEntitlementsUpdatedEvent/ItemEntitlementsUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ItemEntitlementsUpdatedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemEntitlementsUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.impactedItem.ImpactedItem;
+import com.chargebee.v4.models.impactedItem.ImpactedItem;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.metadata.Metadata;
 
-import com.chargebee.v4.core.models.impactedSubscription.ImpactedSubscription;
+import com.chargebee.v4.models.impactedSubscription.ImpactedSubscription;
 
-import com.chargebee.v4.core.models.metadata.Metadata;
+import com.chargebee.v4.models.feature.Feature;
 
 public class ItemEntitlementsUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemFamilyCreatedEvent/ItemFamilyCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/ItemFamilyCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/itemFamilyCreatedEvent/ItemFamilyCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ItemFamilyCreatedEvent.java
index 49c8e4a5..df8344c8 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemFamilyCreatedEvent/ItemFamilyCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ItemFamilyCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemFamilyCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.itemFamily.ItemFamily;
+import com.chargebee.v4.models.itemFamily.ItemFamily;
 
 public class ItemFamilyCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemFamilyDeletedEvent/ItemFamilyDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/ItemFamilyDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/itemFamilyDeletedEvent/ItemFamilyDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ItemFamilyDeletedEvent.java
index c7377e6a..f62daafd 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemFamilyDeletedEvent/ItemFamilyDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ItemFamilyDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemFamilyDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.itemFamily.ItemFamily;
+import com.chargebee.v4.models.itemFamily.ItemFamily;
 
 public class ItemFamilyDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemFamilyUpdatedEvent/ItemFamilyUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/ItemFamilyUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/itemFamilyUpdatedEvent/ItemFamilyUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ItemFamilyUpdatedEvent.java
index 4c58c38a..c2e5c9e8 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemFamilyUpdatedEvent/ItemFamilyUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ItemFamilyUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemFamilyUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.itemFamily.ItemFamily;
+import com.chargebee.v4.models.itemFamily.ItemFamily;
 
 public class ItemFamilyUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemPriceCreatedEvent/ItemPriceCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/ItemPriceCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/itemPriceCreatedEvent/ItemPriceCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ItemPriceCreatedEvent.java
index 1d417935..cc676864 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemPriceCreatedEvent/ItemPriceCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ItemPriceCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemPriceCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.itemPrice.ItemPrice;
+import com.chargebee.v4.models.itemPrice.ItemPrice;
 
 public class ItemPriceCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemPriceDeletedEvent/ItemPriceDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/ItemPriceDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/itemPriceDeletedEvent/ItemPriceDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ItemPriceDeletedEvent.java
index 44700077..48cebf1e 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemPriceDeletedEvent/ItemPriceDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ItemPriceDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemPriceDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.itemPrice.ItemPrice;
+import com.chargebee.v4.models.itemPrice.ItemPrice;
 
 public class ItemPriceDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemPriceEntitlementsRemovedEvent/ItemPriceEntitlementsRemovedEvent.java b/src/main/java/com/chargebee/v4/models/event/ItemPriceEntitlementsRemovedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/itemPriceEntitlementsRemovedEvent/ItemPriceEntitlementsRemovedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ItemPriceEntitlementsRemovedEvent.java
index 7532ade7..01e68f1e 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemPriceEntitlementsRemovedEvent/ItemPriceEntitlementsRemovedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ItemPriceEntitlementsRemovedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemPriceEntitlementsRemovedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.metadata.Metadata;
 
-import com.chargebee.v4.core.models.impactedItemPrice.ImpactedItemPrice;
+import com.chargebee.v4.models.impactedItemPrice.ImpactedItemPrice;
 
-import com.chargebee.v4.core.models.impactedSubscription.ImpactedSubscription;
+import com.chargebee.v4.models.impactedSubscription.ImpactedSubscription;
 
-import com.chargebee.v4.core.models.metadata.Metadata;
+import com.chargebee.v4.models.feature.Feature;
 
 public class ItemPriceEntitlementsRemovedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemPriceEntitlementsUpdatedEvent/ItemPriceEntitlementsUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/ItemPriceEntitlementsUpdatedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/itemPriceEntitlementsUpdatedEvent/ItemPriceEntitlementsUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ItemPriceEntitlementsUpdatedEvent.java
index 0e83127f..77bc7341 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemPriceEntitlementsUpdatedEvent/ItemPriceEntitlementsUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ItemPriceEntitlementsUpdatedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemPriceEntitlementsUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.metadata.Metadata;
 
-import com.chargebee.v4.core.models.impactedItemPrice.ImpactedItemPrice;
+import com.chargebee.v4.models.impactedItemPrice.ImpactedItemPrice;
 
-import com.chargebee.v4.core.models.impactedSubscription.ImpactedSubscription;
+import com.chargebee.v4.models.impactedSubscription.ImpactedSubscription;
 
-import com.chargebee.v4.core.models.metadata.Metadata;
+import com.chargebee.v4.models.feature.Feature;
 
 public class ItemPriceEntitlementsUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemPriceUpdatedEvent/ItemPriceUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/ItemPriceUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/itemPriceUpdatedEvent/ItemPriceUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ItemPriceUpdatedEvent.java
index ca98a387..124c98c9 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemPriceUpdatedEvent/ItemPriceUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ItemPriceUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemPriceUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.itemPrice.ItemPrice;
+import com.chargebee.v4.models.itemPrice.ItemPrice;
 
 public class ItemPriceUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemUpdatedEvent/ItemUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/ItemUpdatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/itemUpdatedEvent/ItemUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ItemUpdatedEvent.java
index 896fb558..d6a01f77 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemUpdatedEvent/ItemUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ItemUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.item.Item;
+import com.chargebee.v4.models.item.Item;
 
 public class ItemUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/mrrUpdatedEvent/MrrUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/MrrUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/mrrUpdatedEvent/MrrUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/MrrUpdatedEvent.java
index 37c3f5c8..4abb1aad 100644
--- a/src/main/java/com/chargebee/v4/core/models/mrrUpdatedEvent/MrrUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/MrrUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.mrrUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
 public class MrrUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/netdPaymentDueReminderEvent/NetdPaymentDueReminderEvent.java b/src/main/java/com/chargebee/v4/models/event/NetdPaymentDueReminderEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/netdPaymentDueReminderEvent/NetdPaymentDueReminderEvent.java
rename to src/main/java/com/chargebee/v4/models/event/NetdPaymentDueReminderEvent.java
index b9d3fb1b..434f2dcf 100644
--- a/src/main/java/com/chargebee/v4/core/models/netdPaymentDueReminderEvent/NetdPaymentDueReminderEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/NetdPaymentDueReminderEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.netdPaymentDueReminderEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class NetdPaymentDueReminderEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrderCreatedEvent/OmnichannelOneTimeOrderCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelOneTimeOrderCreatedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrderCreatedEvent/OmnichannelOneTimeOrderCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelOneTimeOrderCreatedEvent.java
index 4267e109..0d04524f 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrderCreatedEvent/OmnichannelOneTimeOrderCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelOneTimeOrderCreatedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelOneTimeOrderCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelTransaction.OmnichannelTransaction;
+import com.chargebee.v4.models.omnichannelOneTimeOrder.OmnichannelOneTimeOrder;
 
-import com.chargebee.v4.core.models.omnichannelOneTimeOrder.OmnichannelOneTimeOrder;
+import com.chargebee.v4.models.omnichannelOneTimeOrderItem.OmnichannelOneTimeOrderItem;
 
-import com.chargebee.v4.core.models.omnichannelOneTimeOrderItem.OmnichannelOneTimeOrderItem;
+import com.chargebee.v4.models.omnichannelTransaction.OmnichannelTransaction;
 
 public class OmnichannelOneTimeOrderCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrderItemCancelledEvent/OmnichannelOneTimeOrderItemCancelledEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelOneTimeOrderItemCancelledEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrderItemCancelledEvent/OmnichannelOneTimeOrderItemCancelledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelOneTimeOrderItemCancelledEvent.java
index 31b0091f..d1fdacd7 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrderItemCancelledEvent/OmnichannelOneTimeOrderItemCancelledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelOneTimeOrderItemCancelledEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelOneTimeOrderItemCancelledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelTransaction.OmnichannelTransaction;
+import com.chargebee.v4.models.omnichannelOneTimeOrder.OmnichannelOneTimeOrder;
 
-import com.chargebee.v4.core.models.omnichannelOneTimeOrder.OmnichannelOneTimeOrder;
+import com.chargebee.v4.models.omnichannelOneTimeOrderItem.OmnichannelOneTimeOrderItem;
 
-import com.chargebee.v4.core.models.omnichannelOneTimeOrderItem.OmnichannelOneTimeOrderItem;
+import com.chargebee.v4.models.omnichannelTransaction.OmnichannelTransaction;
 
 public class OmnichannelOneTimeOrderItemCancelledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionCreatedEvent/OmnichannelSubscriptionCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionCreatedEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionCreatedEvent/OmnichannelSubscriptionCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionCreatedEvent.java
index 8caff076..1f675f8c 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionCreatedEvent/OmnichannelSubscriptionCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionCreatedEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelTransaction.OmnichannelTransaction;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelTransaction.OmnichannelTransaction;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
 
 public class OmnichannelSubscriptionCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionImportedEvent/OmnichannelSubscriptionImportedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionImportedEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionImportedEvent/OmnichannelSubscriptionImportedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionImportedEvent.java
index 53244216..850d0a5b 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionImportedEvent/OmnichannelSubscriptionImportedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionImportedEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionImportedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelTransaction.OmnichannelTransaction;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelTransaction.OmnichannelTransaction;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
 
 public class OmnichannelSubscriptionImportedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemCancellationScheduledEvent/OmnichannelSubscriptionItemCancellationScheduledEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemCancellationScheduledEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemCancellationScheduledEvent/OmnichannelSubscriptionItemCancellationScheduledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemCancellationScheduledEvent.java
index 76f50620..89d2feee 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemCancellationScheduledEvent/OmnichannelSubscriptionItemCancellationScheduledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemCancellationScheduledEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemCancellationScheduledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
 public class OmnichannelSubscriptionItemCancellationScheduledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemCancelledEvent/OmnichannelSubscriptionItemCancelledEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemCancelledEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemCancelledEvent/OmnichannelSubscriptionItemCancelledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemCancelledEvent.java
index a6990811..2648f536 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemCancelledEvent/OmnichannelSubscriptionItemCancelledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemCancelledEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemCancelledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
 public class OmnichannelSubscriptionItemCancelledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemChangeScheduledEvent/OmnichannelSubscriptionItemChangeScheduledEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemChangeScheduledEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemChangeScheduledEvent/OmnichannelSubscriptionItemChangeScheduledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemChangeScheduledEvent.java
index bf141a14..a0064ebc 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemChangeScheduledEvent/OmnichannelSubscriptionItemChangeScheduledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemChangeScheduledEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemChangeScheduledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
 
 public class OmnichannelSubscriptionItemChangeScheduledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemChangedEvent/OmnichannelSubscriptionItemChangedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemChangedEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemChangedEvent/OmnichannelSubscriptionItemChangedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemChangedEvent.java
index eec1e846..5afbd41a 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemChangedEvent/OmnichannelSubscriptionItemChangedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemChangedEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemChangedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelTransaction.OmnichannelTransaction;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelTransaction.OmnichannelTransaction;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
 
 public class OmnichannelSubscriptionItemChangedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemDowngradeScheduledEvent/OmnichannelSubscriptionItemDowngradeScheduledEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemDowngradeScheduledEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemDowngradeScheduledEvent/OmnichannelSubscriptionItemDowngradeScheduledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemDowngradeScheduledEvent.java
index d2072917..6ec638c6 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemDowngradeScheduledEvent/OmnichannelSubscriptionItemDowngradeScheduledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemDowngradeScheduledEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemDowngradeScheduledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
 public class OmnichannelSubscriptionItemDowngradeScheduledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemDowngradedEvent/OmnichannelSubscriptionItemDowngradedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemDowngradedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemDowngradedEvent/OmnichannelSubscriptionItemDowngradedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemDowngradedEvent.java
index 559770c6..6ad7915b 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemDowngradedEvent/OmnichannelSubscriptionItemDowngradedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemDowngradedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemDowngradedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelTransaction.OmnichannelTransaction;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelTransaction.OmnichannelTransaction;
 
 public class OmnichannelSubscriptionItemDowngradedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemDunningExpiredEvent/OmnichannelSubscriptionItemDunningExpiredEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemDunningExpiredEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemDunningExpiredEvent/OmnichannelSubscriptionItemDunningExpiredEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemDunningExpiredEvent.java
index 5a0de9cc..7f01451c 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemDunningExpiredEvent/OmnichannelSubscriptionItemDunningExpiredEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemDunningExpiredEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemDunningExpiredEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
 public class OmnichannelSubscriptionItemDunningExpiredEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemDunningStartedEvent/OmnichannelSubscriptionItemDunningStartedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemDunningStartedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemDunningStartedEvent/OmnichannelSubscriptionItemDunningStartedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemDunningStartedEvent.java
index 2fe631f8..9a90d941 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemDunningStartedEvent/OmnichannelSubscriptionItemDunningStartedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemDunningStartedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemDunningStartedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
 public class OmnichannelSubscriptionItemDunningStartedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemExpiredEvent/OmnichannelSubscriptionItemExpiredEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemExpiredEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemExpiredEvent/OmnichannelSubscriptionItemExpiredEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemExpiredEvent.java
index 8434027a..7200725d 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemExpiredEvent/OmnichannelSubscriptionItemExpiredEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemExpiredEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemExpiredEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
 public class OmnichannelSubscriptionItemExpiredEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemGracePeriodExpiredEvent/OmnichannelSubscriptionItemGracePeriodExpiredEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemGracePeriodExpiredEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemGracePeriodExpiredEvent/OmnichannelSubscriptionItemGracePeriodExpiredEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemGracePeriodExpiredEvent.java
index c2bb0678..1ba71ae9 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemGracePeriodExpiredEvent/OmnichannelSubscriptionItemGracePeriodExpiredEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemGracePeriodExpiredEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemGracePeriodExpiredEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
 public class OmnichannelSubscriptionItemGracePeriodExpiredEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemGracePeriodStartedEvent/OmnichannelSubscriptionItemGracePeriodStartedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemGracePeriodStartedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemGracePeriodStartedEvent/OmnichannelSubscriptionItemGracePeriodStartedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemGracePeriodStartedEvent.java
index 1be523b5..32257fe5 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemGracePeriodStartedEvent/OmnichannelSubscriptionItemGracePeriodStartedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemGracePeriodStartedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemGracePeriodStartedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
 public class OmnichannelSubscriptionItemGracePeriodStartedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemPauseScheduledEvent/OmnichannelSubscriptionItemPauseScheduledEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemPauseScheduledEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemPauseScheduledEvent/OmnichannelSubscriptionItemPauseScheduledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemPauseScheduledEvent.java
index 23a32d65..e902e5ba 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemPauseScheduledEvent/OmnichannelSubscriptionItemPauseScheduledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemPauseScheduledEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemPauseScheduledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
 
 public class OmnichannelSubscriptionItemPauseScheduledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemPausedEvent/OmnichannelSubscriptionItemPausedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemPausedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemPausedEvent/OmnichannelSubscriptionItemPausedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemPausedEvent.java
index 1e2cae36..086e7c90 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemPausedEvent/OmnichannelSubscriptionItemPausedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemPausedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemPausedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
 public class OmnichannelSubscriptionItemPausedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemReactivatedEvent/OmnichannelSubscriptionItemReactivatedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemReactivatedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemReactivatedEvent/OmnichannelSubscriptionItemReactivatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemReactivatedEvent.java
index 6efbafaf..fb78d019 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemReactivatedEvent/OmnichannelSubscriptionItemReactivatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemReactivatedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemReactivatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
 public class OmnichannelSubscriptionItemReactivatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemRenewedEvent/OmnichannelSubscriptionItemRenewedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemRenewedEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemRenewedEvent/OmnichannelSubscriptionItemRenewedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemRenewedEvent.java
index 5a0be6e2..0b9ea8dd 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemRenewedEvent/OmnichannelSubscriptionItemRenewedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemRenewedEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemRenewedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelTransaction.OmnichannelTransaction;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelTransaction.OmnichannelTransaction;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
 
 public class OmnichannelSubscriptionItemRenewedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemResubscribedEvent/OmnichannelSubscriptionItemResubscribedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemResubscribedEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemResubscribedEvent/OmnichannelSubscriptionItemResubscribedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemResubscribedEvent.java
index f14becf4..12013522 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemResubscribedEvent/OmnichannelSubscriptionItemResubscribedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemResubscribedEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemResubscribedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelTransaction.OmnichannelTransaction;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelTransaction.OmnichannelTransaction;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
 
 public class OmnichannelSubscriptionItemResubscribedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemResumedEvent/OmnichannelSubscriptionItemResumedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemResumedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemResumedEvent/OmnichannelSubscriptionItemResumedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemResumedEvent.java
index f0739ad3..3746174d 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemResumedEvent/OmnichannelSubscriptionItemResumedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemResumedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemResumedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
 public class OmnichannelSubscriptionItemResumedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemScheduledCancellationRemovedEvent/OmnichannelSubscriptionItemScheduledCancellationRemovedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemScheduledCancellationRemovedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemScheduledCancellationRemovedEvent/OmnichannelSubscriptionItemScheduledCancellationRemovedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemScheduledCancellationRemovedEvent.java
index c14f2102..e07e1dc8 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemScheduledCancellationRemovedEvent/OmnichannelSubscriptionItemScheduledCancellationRemovedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemScheduledCancellationRemovedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledCancellationRemovedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
 public class OmnichannelSubscriptionItemScheduledCancellationRemovedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemScheduledChangeRemovedEvent/OmnichannelSubscriptionItemScheduledChangeRemovedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemScheduledChangeRemovedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemScheduledChangeRemovedEvent/OmnichannelSubscriptionItemScheduledChangeRemovedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemScheduledChangeRemovedEvent.java
index 62ce302c..f7355dd0 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemScheduledChangeRemovedEvent/OmnichannelSubscriptionItemScheduledChangeRemovedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemScheduledChangeRemovedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledChangeRemovedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
 
 public class OmnichannelSubscriptionItemScheduledChangeRemovedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemScheduledDowngradeRemovedEvent/OmnichannelSubscriptionItemScheduledDowngradeRemovedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemScheduledDowngradeRemovedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemScheduledDowngradeRemovedEvent/OmnichannelSubscriptionItemScheduledDowngradeRemovedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemScheduledDowngradeRemovedEvent.java
index 7691ab6c..5ecd1a1a 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemScheduledDowngradeRemovedEvent/OmnichannelSubscriptionItemScheduledDowngradeRemovedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemScheduledDowngradeRemovedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledDowngradeRemovedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
 public class OmnichannelSubscriptionItemScheduledDowngradeRemovedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemUpgradedEvent/OmnichannelSubscriptionItemUpgradedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemUpgradedEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemUpgradedEvent/OmnichannelSubscriptionItemUpgradedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemUpgradedEvent.java
index c64ad473..5e6a9c9e 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemUpgradedEvent/OmnichannelSubscriptionItemUpgradedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionItemUpgradedEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemUpgradedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.models.omnichannelTransaction.OmnichannelTransaction;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
 
-import com.chargebee.v4.core.models.omnichannelSubscriptionItem.OmnichannelSubscriptionItem;
+import com.chargebee.v4.models.omnichannelTransaction.OmnichannelTransaction;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
 
 public class OmnichannelSubscriptionItemUpgradedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionMovedInEvent/OmnichannelSubscriptionMovedInEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionMovedInEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionMovedInEvent/OmnichannelSubscriptionMovedInEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionMovedInEvent.java
index 9f5299e8..23cfac59 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionMovedInEvent/OmnichannelSubscriptionMovedInEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelSubscriptionMovedInEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionMovedInEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
 public class OmnichannelSubscriptionMovedInEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelTransactionCreatedEvent/OmnichannelTransactionCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/OmnichannelTransactionCreatedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelTransactionCreatedEvent/OmnichannelTransactionCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OmnichannelTransactionCreatedEvent.java
index f2a1f6e4..69f9af9b 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelTransactionCreatedEvent/OmnichannelTransactionCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OmnichannelTransactionCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelTransactionCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.omnichannelTransaction.OmnichannelTransaction;
+import com.chargebee.v4.models.omnichannelTransaction.OmnichannelTransaction;
 
 public class OmnichannelTransactionCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/orderCancelledEvent/OrderCancelledEvent.java b/src/main/java/com/chargebee/v4/models/event/OrderCancelledEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/orderCancelledEvent/OrderCancelledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OrderCancelledEvent.java
index 82a2cca7..f31310bd 100644
--- a/src/main/java/com/chargebee/v4/core/models/orderCancelledEvent/OrderCancelledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OrderCancelledEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.orderCancelledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
 public class OrderCancelledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/orderCreatedEvent/OrderCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/OrderCreatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/orderCreatedEvent/OrderCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OrderCreatedEvent.java
index 402342a9..fa30bde6 100644
--- a/src/main/java/com/chargebee/v4/core/models/orderCreatedEvent/OrderCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OrderCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.orderCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
 public class OrderCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/orderDeletedEvent/OrderDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/OrderDeletedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/orderDeletedEvent/OrderDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OrderDeletedEvent.java
index 3954df05..b58e0b1d 100644
--- a/src/main/java/com/chargebee/v4/core/models/orderDeletedEvent/OrderDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OrderDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.orderDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
 public class OrderDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/orderDeliveredEvent/OrderDeliveredEvent.java b/src/main/java/com/chargebee/v4/models/event/OrderDeliveredEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/orderDeliveredEvent/OrderDeliveredEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OrderDeliveredEvent.java
index ba9b9318..19292f4e 100644
--- a/src/main/java/com/chargebee/v4/core/models/orderDeliveredEvent/OrderDeliveredEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OrderDeliveredEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.orderDeliveredEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
 public class OrderDeliveredEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/orderReadyToProcessEvent/OrderReadyToProcessEvent.java b/src/main/java/com/chargebee/v4/models/event/OrderReadyToProcessEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/orderReadyToProcessEvent/OrderReadyToProcessEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OrderReadyToProcessEvent.java
index 588a315e..a47258d7 100644
--- a/src/main/java/com/chargebee/v4/core/models/orderReadyToProcessEvent/OrderReadyToProcessEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OrderReadyToProcessEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.orderReadyToProcessEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
 public class OrderReadyToProcessEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/orderReadyToShipEvent/OrderReadyToShipEvent.java b/src/main/java/com/chargebee/v4/models/event/OrderReadyToShipEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/orderReadyToShipEvent/OrderReadyToShipEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OrderReadyToShipEvent.java
index 96d00f8e..933414e1 100644
--- a/src/main/java/com/chargebee/v4/core/models/orderReadyToShipEvent/OrderReadyToShipEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OrderReadyToShipEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.orderReadyToShipEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
 public class OrderReadyToShipEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/orderResentEvent/OrderResentEvent.java b/src/main/java/com/chargebee/v4/models/event/OrderResentEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/orderResentEvent/OrderResentEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OrderResentEvent.java
index 34d42e97..5429ff7b 100644
--- a/src/main/java/com/chargebee/v4/core/models/orderResentEvent/OrderResentEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OrderResentEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.orderResentEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
 public class OrderResentEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/orderReturnedEvent/OrderReturnedEvent.java b/src/main/java/com/chargebee/v4/models/event/OrderReturnedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/orderReturnedEvent/OrderReturnedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OrderReturnedEvent.java
index ac2a362d..10e48258 100644
--- a/src/main/java/com/chargebee/v4/core/models/orderReturnedEvent/OrderReturnedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OrderReturnedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.orderReturnedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
 public class OrderReturnedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/orderUpdatedEvent/OrderUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/OrderUpdatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/orderUpdatedEvent/OrderUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/OrderUpdatedEvent.java
index 2b34965c..6d5393c9 100644
--- a/src/main/java/com/chargebee/v4/core/models/orderUpdatedEvent/OrderUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/OrderUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.orderUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
 public class OrderUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentFailedEvent/PaymentFailedEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentFailedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/paymentFailedEvent/PaymentFailedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentFailedEvent.java
index 2d26400f..b19c5fc8 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentFailedEvent/PaymentFailedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentFailedEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentFailedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class PaymentFailedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentInitiatedEvent/PaymentInitiatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentInitiatedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/paymentInitiatedEvent/PaymentInitiatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentInitiatedEvent.java
index 13d06c0d..8c3b4cc3 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentInitiatedEvent/PaymentInitiatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentInitiatedEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentInitiatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class PaymentInitiatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentIntentCreatedEvent/PaymentIntentCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentIntentCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/paymentIntentCreatedEvent/PaymentIntentCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentIntentCreatedEvent.java
index 65b97184..8c2bd175 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentIntentCreatedEvent/PaymentIntentCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentIntentCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentIntentCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.paymentIntent.PaymentIntent;
+import com.chargebee.v4.models.paymentIntent.PaymentIntent;
 
 public class PaymentIntentCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentIntentUpdatedEvent/PaymentIntentUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentIntentUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/paymentIntentUpdatedEvent/PaymentIntentUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentIntentUpdatedEvent.java
index 539c6a6a..483fbef5 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentIntentUpdatedEvent/PaymentIntentUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentIntentUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentIntentUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.paymentIntent.PaymentIntent;
+import com.chargebee.v4.models.paymentIntent.PaymentIntent;
 
 public class PaymentIntentUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentRefundedEvent/PaymentRefundedEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentRefundedEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/paymentRefundedEvent/PaymentRefundedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentRefundedEvent.java
index 19ee426c..8711f46a 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentRefundedEvent/PaymentRefundedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentRefundedEvent.java
@@ -5,21 +5,21 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentRefundedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class PaymentRefundedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentScheduleSchemeCreatedEvent/PaymentScheduleSchemeCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentScheduleSchemeCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/paymentScheduleSchemeCreatedEvent/PaymentScheduleSchemeCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentScheduleSchemeCreatedEvent.java
index f0e4a419..3de4c931 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentScheduleSchemeCreatedEvent/PaymentScheduleSchemeCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentScheduleSchemeCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentScheduleSchemeCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.paymentScheduleScheme.PaymentScheduleScheme;
+import com.chargebee.v4.models.paymentScheduleScheme.PaymentScheduleScheme;
 
 public class PaymentScheduleSchemeCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentScheduleSchemeDeletedEvent/PaymentScheduleSchemeDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentScheduleSchemeDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/paymentScheduleSchemeDeletedEvent/PaymentScheduleSchemeDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentScheduleSchemeDeletedEvent.java
index 3e832a54..d03a5aca 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentScheduleSchemeDeletedEvent/PaymentScheduleSchemeDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentScheduleSchemeDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentScheduleSchemeDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.paymentScheduleScheme.PaymentScheduleScheme;
+import com.chargebee.v4.models.paymentScheduleScheme.PaymentScheduleScheme;
 
 public class PaymentScheduleSchemeDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSchedulesCreatedEvent/PaymentSchedulesCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentSchedulesCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/paymentSchedulesCreatedEvent/PaymentSchedulesCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentSchedulesCreatedEvent.java
index 488bd199..5a63d848 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSchedulesCreatedEvent/PaymentSchedulesCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentSchedulesCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentSchedulesCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.paymentSchedule.PaymentSchedule;
+import com.chargebee.v4.models.paymentSchedule.PaymentSchedule;
 
 public class PaymentSchedulesCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSchedulesUpdatedEvent/PaymentSchedulesUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentSchedulesUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/paymentSchedulesUpdatedEvent/PaymentSchedulesUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentSchedulesUpdatedEvent.java
index cb11c7cf..437dcccd 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSchedulesUpdatedEvent/PaymentSchedulesUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentSchedulesUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentSchedulesUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.paymentSchedule.PaymentSchedule;
+import com.chargebee.v4.models.paymentSchedule.PaymentSchedule;
 
 public class PaymentSchedulesUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSourceAddedEvent/PaymentSourceAddedEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentSourceAddedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/paymentSourceAddedEvent/PaymentSourceAddedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentSourceAddedEvent.java
index 1d0578c1..52cc0de6 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSourceAddedEvent/PaymentSourceAddedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentSourceAddedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentSourceAddedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
 public class PaymentSourceAddedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSourceDeletedEvent/PaymentSourceDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentSourceDeletedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/paymentSourceDeletedEvent/PaymentSourceDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentSourceDeletedEvent.java
index ed0cb0b0..fc0f9308 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSourceDeletedEvent/PaymentSourceDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentSourceDeletedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentSourceDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
 public class PaymentSourceDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSourceExpiredEvent/PaymentSourceExpiredEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentSourceExpiredEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/paymentSourceExpiredEvent/PaymentSourceExpiredEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentSourceExpiredEvent.java
index e2383ecc..cd064f17 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSourceExpiredEvent/PaymentSourceExpiredEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentSourceExpiredEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentSourceExpiredEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
 public class PaymentSourceExpiredEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSourceExpiringEvent/PaymentSourceExpiringEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentSourceExpiringEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/paymentSourceExpiringEvent/PaymentSourceExpiringEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentSourceExpiringEvent.java
index ce9cb90b..aa5f12b8 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSourceExpiringEvent/PaymentSourceExpiringEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentSourceExpiringEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentSourceExpiringEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
 public class PaymentSourceExpiringEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSourceLocallyDeletedEvent/PaymentSourceLocallyDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentSourceLocallyDeletedEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/paymentSourceLocallyDeletedEvent/PaymentSourceLocallyDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentSourceLocallyDeletedEvent.java
index 367afea1..a9f4ff6a 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSourceLocallyDeletedEvent/PaymentSourceLocallyDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentSourceLocallyDeletedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentSourceLocallyDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
 public class PaymentSourceLocallyDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSourceUpdatedEvent/PaymentSourceUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentSourceUpdatedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/paymentSourceUpdatedEvent/PaymentSourceUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentSourceUpdatedEvent.java
index 5ea6a5b8..e476d4e4 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSourceUpdatedEvent/PaymentSourceUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentSourceUpdatedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentSourceUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
 public class PaymentSourceUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSucceededEvent/PaymentSucceededEvent.java b/src/main/java/com/chargebee/v4/models/event/PaymentSucceededEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/paymentSucceededEvent/PaymentSucceededEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PaymentSucceededEvent.java
index 7b6b67df..6c4211b5 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSucceededEvent/PaymentSucceededEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PaymentSucceededEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentSucceededEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class PaymentSucceededEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/pendingInvoiceCreatedEvent/PendingInvoiceCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PendingInvoiceCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/pendingInvoiceCreatedEvent/PendingInvoiceCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PendingInvoiceCreatedEvent.java
index 982ed951..6e5d882c 100644
--- a/src/main/java/com/chargebee/v4/core/models/pendingInvoiceCreatedEvent/PendingInvoiceCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PendingInvoiceCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.pendingInvoiceCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class PendingInvoiceCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/pendingInvoiceUpdatedEvent/PendingInvoiceUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PendingInvoiceUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/pendingInvoiceUpdatedEvent/PendingInvoiceUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PendingInvoiceUpdatedEvent.java
index 16bb9c50..11efad2f 100644
--- a/src/main/java/com/chargebee/v4/core/models/pendingInvoiceUpdatedEvent/PendingInvoiceUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PendingInvoiceUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.pendingInvoiceUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class PendingInvoiceUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/planCreatedEvent/PlanCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PlanCreatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/planCreatedEvent/PlanCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PlanCreatedEvent.java
index 2726251e..5d9c71f9 100644
--- a/src/main/java/com/chargebee/v4/core/models/planCreatedEvent/PlanCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PlanCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.planCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.plan.Plan;
+import com.chargebee.v4.models.plan.Plan;
 
 public class PlanCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/planDeletedEvent/PlanDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/PlanDeletedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/planDeletedEvent/PlanDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PlanDeletedEvent.java
index f2ba7209..1afb2989 100644
--- a/src/main/java/com/chargebee/v4/core/models/planDeletedEvent/PlanDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PlanDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.planDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.plan.Plan;
+import com.chargebee.v4.models.plan.Plan;
 
 public class PlanDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/planUpdatedEvent/PlanUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PlanUpdatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/planUpdatedEvent/PlanUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PlanUpdatedEvent.java
index ba6cdb18..b30af5d9 100644
--- a/src/main/java/com/chargebee/v4/core/models/planUpdatedEvent/PlanUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PlanUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.planUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.plan.Plan;
+import com.chargebee.v4.models.plan.Plan;
 
 public class PlanUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/priceVariantCreatedEvent/PriceVariantCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PriceVariantCreatedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/priceVariantCreatedEvent/PriceVariantCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PriceVariantCreatedEvent.java
index ea8745f7..b5787a76 100644
--- a/src/main/java/com/chargebee/v4/core/models/priceVariantCreatedEvent/PriceVariantCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PriceVariantCreatedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.priceVariantCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.attribute.Attribute;
+import com.chargebee.v4.models.priceVariant.PriceVariant;
 
-import com.chargebee.v4.core.models.priceVariant.PriceVariant;
+import com.chargebee.v4.models.attribute.Attribute;
 
 public class PriceVariantCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/priceVariantDeletedEvent/PriceVariantDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/PriceVariantDeletedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/priceVariantDeletedEvent/PriceVariantDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PriceVariantDeletedEvent.java
index eb72cee2..5fccd31d 100644
--- a/src/main/java/com/chargebee/v4/core/models/priceVariantDeletedEvent/PriceVariantDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PriceVariantDeletedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.priceVariantDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.attribute.Attribute;
+import com.chargebee.v4.models.priceVariant.PriceVariant;
 
-import com.chargebee.v4.core.models.priceVariant.PriceVariant;
+import com.chargebee.v4.models.attribute.Attribute;
 
 public class PriceVariantDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/priceVariantUpdatedEvent/PriceVariantUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PriceVariantUpdatedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/priceVariantUpdatedEvent/PriceVariantUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PriceVariantUpdatedEvent.java
index c3785dd1..3d2a4292 100644
--- a/src/main/java/com/chargebee/v4/core/models/priceVariantUpdatedEvent/PriceVariantUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PriceVariantUpdatedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.priceVariantUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.attribute.Attribute;
+import com.chargebee.v4.models.priceVariant.PriceVariant;
 
-import com.chargebee.v4.core.models.priceVariant.PriceVariant;
+import com.chargebee.v4.models.attribute.Attribute;
 
 public class PriceVariantUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/productCreatedEvent/ProductCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/ProductCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/productCreatedEvent/ProductCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ProductCreatedEvent.java
index 91106499..5e4f7a79 100644
--- a/src/main/java/com/chargebee/v4/core/models/productCreatedEvent/ProductCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ProductCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.productCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.product.Product;
+import com.chargebee.v4.models.product.Product;
 
 public class ProductCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/productDeletedEvent/ProductDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/ProductDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/productDeletedEvent/ProductDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ProductDeletedEvent.java
index 5e233bcd..f0521e9b 100644
--- a/src/main/java/com/chargebee/v4/core/models/productDeletedEvent/ProductDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ProductDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.productDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.product.Product;
+import com.chargebee.v4.models.product.Product;
 
 public class ProductDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/productUpdatedEvent/ProductUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/ProductUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/productUpdatedEvent/ProductUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/ProductUpdatedEvent.java
index 52e6f44e..67b140e7 100644
--- a/src/main/java/com/chargebee/v4/core/models/productUpdatedEvent/ProductUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/ProductUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.productUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.product.Product;
+import com.chargebee.v4.models.product.Product;
 
 public class ProductUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/promotionalCreditsAddedEvent/PromotionalCreditsAddedEvent.java b/src/main/java/com/chargebee/v4/models/event/PromotionalCreditsAddedEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/promotionalCreditsAddedEvent/PromotionalCreditsAddedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PromotionalCreditsAddedEvent.java
index b32fcead..88759055 100644
--- a/src/main/java/com/chargebee/v4/core/models/promotionalCreditsAddedEvent/PromotionalCreditsAddedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PromotionalCreditsAddedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.promotionalCreditsAddedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.promotionalCredit.PromotionalCredit;
+import com.chargebee.v4.models.promotionalCredit.PromotionalCredit;
 
 public class PromotionalCreditsAddedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/promotionalCreditsDeductedEvent/PromotionalCreditsDeductedEvent.java b/src/main/java/com/chargebee/v4/models/event/PromotionalCreditsDeductedEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/promotionalCreditsDeductedEvent/PromotionalCreditsDeductedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PromotionalCreditsDeductedEvent.java
index 441d0e54..8b788ed5 100644
--- a/src/main/java/com/chargebee/v4/core/models/promotionalCreditsDeductedEvent/PromotionalCreditsDeductedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PromotionalCreditsDeductedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.promotionalCreditsDeductedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.promotionalCredit.PromotionalCredit;
+import com.chargebee.v4.models.promotionalCredit.PromotionalCredit;
 
 public class PromotionalCreditsDeductedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/purchaseCreatedEvent/PurchaseCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/PurchaseCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/purchaseCreatedEvent/PurchaseCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/PurchaseCreatedEvent.java
index a12d1e21..3458d843 100644
--- a/src/main/java/com/chargebee/v4/core/models/purchaseCreatedEvent/PurchaseCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/PurchaseCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.purchaseCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.purchase.Purchase;
+import com.chargebee.v4.models.purchase.Purchase;
 
 public class PurchaseCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/quoteCreatedEvent/QuoteCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/QuoteCreatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/quoteCreatedEvent/QuoteCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/QuoteCreatedEvent.java
index 147f1a53..cedb3739 100644
--- a/src/main/java/com/chargebee/v4/core/models/quoteCreatedEvent/QuoteCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/QuoteCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.quoteCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.quote.Quote;
+import com.chargebee.v4.models.quote.Quote;
 
 public class QuoteCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/quoteDeletedEvent/QuoteDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/QuoteDeletedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/quoteDeletedEvent/QuoteDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/QuoteDeletedEvent.java
index 030e2958..0619a7f2 100644
--- a/src/main/java/com/chargebee/v4/core/models/quoteDeletedEvent/QuoteDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/QuoteDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.quoteDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.quote.Quote;
+import com.chargebee.v4.models.quote.Quote;
 
 public class QuoteDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/quoteUpdatedEvent/QuoteUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/QuoteUpdatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/quoteUpdatedEvent/QuoteUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/QuoteUpdatedEvent.java
index 2d012748..ebba1b2a 100644
--- a/src/main/java/com/chargebee/v4/core/models/quoteUpdatedEvent/QuoteUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/QuoteUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.quoteUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.quote.Quote;
+import com.chargebee.v4.models.quote.Quote;
 
 public class QuoteUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/recordPurchaseFailedEvent/RecordPurchaseFailedEvent.java b/src/main/java/com/chargebee/v4/models/event/RecordPurchaseFailedEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/recordPurchaseFailedEvent/RecordPurchaseFailedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/RecordPurchaseFailedEvent.java
index 7bd1b2ab..0b0499a4 100644
--- a/src/main/java/com/chargebee/v4/core/models/recordPurchaseFailedEvent/RecordPurchaseFailedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/RecordPurchaseFailedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.recordPurchaseFailedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.recordedPurchase.RecordedPurchase;
+import com.chargebee.v4.models.recordedPurchase.RecordedPurchase;
 
 public class RecordPurchaseFailedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/refundInitiatedEvent/RefundInitiatedEvent.java b/src/main/java/com/chargebee/v4/models/event/RefundInitiatedEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/refundInitiatedEvent/RefundInitiatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/RefundInitiatedEvent.java
index 85b254c6..680a5286 100644
--- a/src/main/java/com/chargebee/v4/core/models/refundInitiatedEvent/RefundInitiatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/RefundInitiatedEvent.java
@@ -5,21 +5,21 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.refundInitiatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class RefundInitiatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/ruleCreatedEvent/RuleCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/RuleCreatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/ruleCreatedEvent/RuleCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/RuleCreatedEvent.java
index 9d9e4170..a2317560 100644
--- a/src/main/java/com/chargebee/v4/core/models/ruleCreatedEvent/RuleCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/RuleCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.ruleCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.rule.Rule;
+import com.chargebee.v4.models.rule.Rule;
 
 public class RuleCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/ruleDeletedEvent/RuleDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/RuleDeletedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/ruleDeletedEvent/RuleDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/RuleDeletedEvent.java
index 42e31591..6218ae1c 100644
--- a/src/main/java/com/chargebee/v4/core/models/ruleDeletedEvent/RuleDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/RuleDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.ruleDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.rule.Rule;
+import com.chargebee.v4.models.rule.Rule;
 
 public class RuleDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/ruleUpdatedEvent/RuleUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/RuleUpdatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/ruleUpdatedEvent/RuleUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/RuleUpdatedEvent.java
index 70f98b90..94ccb535 100644
--- a/src/main/java/com/chargebee/v4/core/models/ruleUpdatedEvent/RuleUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/RuleUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.ruleUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.rule.Rule;
+import com.chargebee.v4.models.rule.Rule;
 
 public class RuleUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/salesOrderCreatedEvent/SalesOrderCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/SalesOrderCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/salesOrderCreatedEvent/SalesOrderCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SalesOrderCreatedEvent.java
index 365ddb86..8fcc4019 100644
--- a/src/main/java/com/chargebee/v4/core/models/salesOrderCreatedEvent/SalesOrderCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SalesOrderCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.salesOrderCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.salesOrder.SalesOrder;
+import com.chargebee.v4.models.salesOrder.SalesOrder;
 
 public class SalesOrderCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/salesOrderUpdatedEvent/SalesOrderUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/SalesOrderUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/salesOrderUpdatedEvent/SalesOrderUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SalesOrderUpdatedEvent.java
index 83217b52..f0f1eacf 100644
--- a/src/main/java/com/chargebee/v4/core/models/salesOrderUpdatedEvent/SalesOrderUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SalesOrderUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.salesOrderUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.salesOrder.SalesOrder;
+import com.chargebee.v4.models.salesOrder.SalesOrder;
 
 public class SalesOrderUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionActivatedEvent/SubscriptionActivatedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionActivatedEvent.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionActivatedEvent/SubscriptionActivatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionActivatedEvent.java
index 662b207c..0b65ab7e 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionActivatedEvent/SubscriptionActivatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionActivatedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionActivatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionActivatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionActivatedWithBackdatingEvent/SubscriptionActivatedWithBackdatingEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionActivatedWithBackdatingEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionActivatedWithBackdatingEvent/SubscriptionActivatedWithBackdatingEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionActivatedWithBackdatingEvent.java
index 0d3ff150..28c246b2 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionActivatedWithBackdatingEvent/SubscriptionActivatedWithBackdatingEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionActivatedWithBackdatingEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionActivatedWithBackdatingEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionActivatedWithBackdatingEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionAdvanceInvoiceScheduleAddedEvent/SubscriptionAdvanceInvoiceScheduleAddedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionAdvanceInvoiceScheduleAddedEvent.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionAdvanceInvoiceScheduleAddedEvent/SubscriptionAdvanceInvoiceScheduleAddedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionAdvanceInvoiceScheduleAddedEvent.java
index 50409c42..eace564a 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionAdvanceInvoiceScheduleAddedEvent/SubscriptionAdvanceInvoiceScheduleAddedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionAdvanceInvoiceScheduleAddedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionAdvanceInvoiceScheduleAddedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.subscription.Subscription;
 
 public class SubscriptionAdvanceInvoiceScheduleAddedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionAdvanceInvoiceScheduleRemovedEvent/SubscriptionAdvanceInvoiceScheduleRemovedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionAdvanceInvoiceScheduleRemovedEvent.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionAdvanceInvoiceScheduleRemovedEvent/SubscriptionAdvanceInvoiceScheduleRemovedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionAdvanceInvoiceScheduleRemovedEvent.java
index 547d711c..26a51b73 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionAdvanceInvoiceScheduleRemovedEvent/SubscriptionAdvanceInvoiceScheduleRemovedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionAdvanceInvoiceScheduleRemovedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionAdvanceInvoiceScheduleRemovedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.subscription.Subscription;
 
 public class SubscriptionAdvanceInvoiceScheduleRemovedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionAdvanceInvoiceScheduleUpdatedEvent/SubscriptionAdvanceInvoiceScheduleUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionAdvanceInvoiceScheduleUpdatedEvent.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionAdvanceInvoiceScheduleUpdatedEvent/SubscriptionAdvanceInvoiceScheduleUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionAdvanceInvoiceScheduleUpdatedEvent.java
index 47e3c11e..a5882e95 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionAdvanceInvoiceScheduleUpdatedEvent/SubscriptionAdvanceInvoiceScheduleUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionAdvanceInvoiceScheduleUpdatedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionAdvanceInvoiceScheduleUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.subscription.Subscription;
 
 public class SubscriptionAdvanceInvoiceScheduleUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionBusinessEntityChangedEvent/SubscriptionBusinessEntityChangedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionBusinessEntityChangedEvent.java
similarity index 78%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionBusinessEntityChangedEvent/SubscriptionBusinessEntityChangedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionBusinessEntityChangedEvent.java
index 6e53262f..b7a674bf 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionBusinessEntityChangedEvent/SubscriptionBusinessEntityChangedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionBusinessEntityChangedEvent.java
@@ -5,15 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionBusinessEntityChangedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.businessEntityTransfer.BusinessEntityTransfer;
 
-import com.chargebee.v4.core.models.businessEntityChange.BusinessEntityChange;
-
-import com.chargebee.v4.core.models.businessEntityTransfer.BusinessEntityTransfer;
+import com.chargebee.v4.models.subscription.Subscription;
 
 public class SubscriptionBusinessEntityChangedEvent {
 
@@ -85,14 +83,9 @@ public static SubscriptionBusinessEntityChangedEvent fromJson(String json) {
 
   public static class Content {
 
-    private BusinessEntityChange businessEntityChange;
     private BusinessEntityTransfer businessEntityTransfer;
     private Subscription subscription;
 
-    public BusinessEntityChange getBusinessEntityChange() {
-      return businessEntityChange;
-    }
-
     public BusinessEntityTransfer getBusinessEntityTransfer() {
       return businessEntityTransfer;
     }
@@ -104,11 +97,6 @@ public Subscription getSubscription() {
     public static Content fromJson(String json) {
       Content obj = new Content();
 
-      String __businessEntityChangeJson = JsonUtil.getObject(json, "business_entity_change");
-      if (__businessEntityChangeJson != null) {
-        obj.businessEntityChange = BusinessEntityChange.fromJson(__businessEntityChangeJson);
-      }
-
       String __businessEntityTransferJson = JsonUtil.getObject(json, "business_entity_transfer");
       if (__businessEntityTransferJson != null) {
         obj.businessEntityTransfer = BusinessEntityTransfer.fromJson(__businessEntityTransferJson);
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionCanceledWithBackdatingEvent/SubscriptionCanceledWithBackdatingEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionCanceledWithBackdatingEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionCanceledWithBackdatingEvent/SubscriptionCanceledWithBackdatingEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionCanceledWithBackdatingEvent.java
index e3382f86..71915da2 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionCanceledWithBackdatingEvent/SubscriptionCanceledWithBackdatingEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionCanceledWithBackdatingEvent.java
@@ -5,21 +5,21 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionCanceledWithBackdatingEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionCanceledWithBackdatingEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionCancellationReminderEvent/SubscriptionCancellationReminderEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionCancellationReminderEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionCancellationReminderEvent/SubscriptionCancellationReminderEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionCancellationReminderEvent.java
index 6364d55d..ae82998d 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionCancellationReminderEvent/SubscriptionCancellationReminderEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionCancellationReminderEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionCancellationReminderEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionCancellationReminderEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionCancellationScheduledEvent/SubscriptionCancellationScheduledEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionCancellationScheduledEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionCancellationScheduledEvent/SubscriptionCancellationScheduledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionCancellationScheduledEvent.java
index 659a1e14..5f324c81 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionCancellationScheduledEvent/SubscriptionCancellationScheduledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionCancellationScheduledEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionCancellationScheduledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionCancellationScheduledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionCancelledEvent/SubscriptionCancelledEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionCancelledEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionCancelledEvent/SubscriptionCancelledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionCancelledEvent.java
index 7b8c6c34..09365302 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionCancelledEvent/SubscriptionCancelledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionCancelledEvent.java
@@ -5,21 +5,21 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionCancelledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionCancelledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionChangedEvent/SubscriptionChangedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionChangedEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionChangedEvent/SubscriptionChangedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionChangedEvent.java
index 83deae4d..46ace6d7 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionChangedEvent/SubscriptionChangedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionChangedEvent.java
@@ -5,21 +5,21 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionChangedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionChangedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionChangedWithBackdatingEvent/SubscriptionChangedWithBackdatingEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionChangedWithBackdatingEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionChangedWithBackdatingEvent/SubscriptionChangedWithBackdatingEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionChangedWithBackdatingEvent.java
index 4aad3d1a..03322194 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionChangedWithBackdatingEvent/SubscriptionChangedWithBackdatingEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionChangedWithBackdatingEvent.java
@@ -5,21 +5,21 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionChangedWithBackdatingEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionChangedWithBackdatingEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionChangesScheduledEvent/SubscriptionChangesScheduledEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionChangesScheduledEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionChangesScheduledEvent/SubscriptionChangesScheduledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionChangesScheduledEvent.java
index bf812a1c..9e3aa67c 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionChangesScheduledEvent/SubscriptionChangesScheduledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionChangesScheduledEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionChangesScheduledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionChangesScheduledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionCreatedEvent/SubscriptionCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionCreatedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionCreatedEvent/SubscriptionCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionCreatedEvent.java
index cba6b755..dfe078eb 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionCreatedEvent/SubscriptionCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionCreatedEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionCreatedWithBackdatingEvent/SubscriptionCreatedWithBackdatingEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionCreatedWithBackdatingEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionCreatedWithBackdatingEvent/SubscriptionCreatedWithBackdatingEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionCreatedWithBackdatingEvent.java
index f5263bbc..360275f8 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionCreatedWithBackdatingEvent/SubscriptionCreatedWithBackdatingEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionCreatedWithBackdatingEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionCreatedWithBackdatingEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionCreatedWithBackdatingEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionDeletedEvent/SubscriptionDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionDeletedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionDeletedEvent/SubscriptionDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionDeletedEvent.java
index e902528b..6e91c744 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionDeletedEvent/SubscriptionDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionDeletedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlementsCreatedEvent/SubscriptionEntitlementsCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionEntitlementsCreatedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionEntitlementsCreatedEvent/SubscriptionEntitlementsCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionEntitlementsCreatedEvent.java
index 8c380707..aa617823 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlementsCreatedEvent/SubscriptionEntitlementsCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionEntitlementsCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionEntitlementsCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.subscriptionEntitlementsCreatedDetail.SubscriptionEntitlementsCreatedDetail;
+import com.chargebee.v4.models.subscriptionEntitlementsCreatedDetail.SubscriptionEntitlementsCreatedDetail;
 
 public class SubscriptionEntitlementsCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlementsUpdatedEvent/SubscriptionEntitlementsUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionEntitlementsUpdatedEvent.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionEntitlementsUpdatedEvent/SubscriptionEntitlementsUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionEntitlementsUpdatedEvent.java
index dd68996d..7565ffbf 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlementsUpdatedEvent/SubscriptionEntitlementsUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionEntitlementsUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionEntitlementsUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.subscriptionEntitlementsUpdatedDetail.SubscriptionEntitlementsUpdatedDetail;
+import com.chargebee.v4.models.subscriptionEntitlementsUpdatedDetail.SubscriptionEntitlementsUpdatedDetail;
 
 public class SubscriptionEntitlementsUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionItemsRenewedEvent/SubscriptionItemsRenewedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionItemsRenewedEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionItemsRenewedEvent/SubscriptionItemsRenewedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionItemsRenewedEvent.java
index 731a8c6e..79568991 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionItemsRenewedEvent/SubscriptionItemsRenewedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionItemsRenewedEvent.java
@@ -5,21 +5,21 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionItemsRenewedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionItemsRenewedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionMovedInEvent/SubscriptionMovedInEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionMovedInEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionMovedInEvent/SubscriptionMovedInEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionMovedInEvent.java
index c95f9eaa..f5c73297 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionMovedInEvent/SubscriptionMovedInEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionMovedInEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionMovedInEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
 public class SubscriptionMovedInEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionMovedOutEvent/SubscriptionMovedOutEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionMovedOutEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionMovedOutEvent/SubscriptionMovedOutEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionMovedOutEvent.java
index 1050bc93..11074b62 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionMovedOutEvent/SubscriptionMovedOutEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionMovedOutEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionMovedOutEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
 public class SubscriptionMovedOutEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionMovementFailedEvent/SubscriptionMovementFailedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionMovementFailedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionMovementFailedEvent/SubscriptionMovementFailedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionMovementFailedEvent.java
index 4170cfd0..dd711e9e 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionMovementFailedEvent/SubscriptionMovementFailedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionMovementFailedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionMovementFailedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
 public class SubscriptionMovementFailedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionPauseScheduledEvent/SubscriptionPauseScheduledEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionPauseScheduledEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionPauseScheduledEvent/SubscriptionPauseScheduledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionPauseScheduledEvent.java
index a66c9b49..6d6f1266 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionPauseScheduledEvent/SubscriptionPauseScheduledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionPauseScheduledEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionPauseScheduledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionPauseScheduledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionPausedEvent/SubscriptionPausedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionPausedEvent.java
similarity index 89%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionPausedEvent/SubscriptionPausedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionPausedEvent.java
index 028df9ef..490136cc 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionPausedEvent/SubscriptionPausedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionPausedEvent.java
@@ -5,21 +5,21 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionPausedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionPausedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionRampAppliedEvent/SubscriptionRampAppliedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionRampAppliedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionRampAppliedEvent/SubscriptionRampAppliedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionRampAppliedEvent.java
index 835c5c7f..d325b728 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionRampAppliedEvent/SubscriptionRampAppliedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionRampAppliedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionRampAppliedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.ramp.Ramp;
+import com.chargebee.v4.models.ramp.Ramp;
 
 public class SubscriptionRampAppliedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionRampCreatedEvent/SubscriptionRampCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionRampCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionRampCreatedEvent/SubscriptionRampCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionRampCreatedEvent.java
index a65adad6..4af8a2a5 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionRampCreatedEvent/SubscriptionRampCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionRampCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionRampCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.ramp.Ramp;
+import com.chargebee.v4.models.ramp.Ramp;
 
 public class SubscriptionRampCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionRampDeletedEvent/SubscriptionRampDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionRampDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionRampDeletedEvent/SubscriptionRampDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionRampDeletedEvent.java
index d057664b..433a57ed 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionRampDeletedEvent/SubscriptionRampDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionRampDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionRampDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.ramp.Ramp;
+import com.chargebee.v4.models.ramp.Ramp;
 
 public class SubscriptionRampDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionRampDraftedEvent/SubscriptionRampDraftedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionRampDraftedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionRampDraftedEvent/SubscriptionRampDraftedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionRampDraftedEvent.java
index b01bee8c..699ba60f 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionRampDraftedEvent/SubscriptionRampDraftedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionRampDraftedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionRampDraftedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.ramp.Ramp;
+import com.chargebee.v4.models.ramp.Ramp;
 
 public class SubscriptionRampDraftedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionRampUpdatedEvent/SubscriptionRampUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionRampUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionRampUpdatedEvent/SubscriptionRampUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionRampUpdatedEvent.java
index 94ed9074..b5ae266e 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionRampUpdatedEvent/SubscriptionRampUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionRampUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionRampUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.ramp.Ramp;
+import com.chargebee.v4.models.ramp.Ramp;
 
 public class SubscriptionRampUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionReactivatedEvent/SubscriptionReactivatedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionReactivatedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionReactivatedEvent/SubscriptionReactivatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionReactivatedEvent.java
index b8b2b564..176caa45 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionReactivatedEvent/SubscriptionReactivatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionReactivatedEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionReactivatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionReactivatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionReactivatedWithBackdatingEvent/SubscriptionReactivatedWithBackdatingEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionReactivatedWithBackdatingEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionReactivatedWithBackdatingEvent/SubscriptionReactivatedWithBackdatingEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionReactivatedWithBackdatingEvent.java
index 0c03f5ed..9fe2431c 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionReactivatedWithBackdatingEvent/SubscriptionReactivatedWithBackdatingEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionReactivatedWithBackdatingEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionReactivatedWithBackdatingEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionReactivatedWithBackdatingEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionRenewalReminderEvent/SubscriptionRenewalReminderEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionRenewalReminderEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionRenewalReminderEvent/SubscriptionRenewalReminderEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionRenewalReminderEvent.java
index 8b7a0468..91a06659 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionRenewalReminderEvent/SubscriptionRenewalReminderEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionRenewalReminderEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionRenewalReminderEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionRenewalReminderEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionRenewedEvent/SubscriptionRenewedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionRenewedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionRenewedEvent/SubscriptionRenewedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionRenewedEvent.java
index 2e16fa67..1fa20bd0 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionRenewedEvent/SubscriptionRenewedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionRenewedEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionRenewedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionRenewedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionResumedEvent/SubscriptionResumedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionResumedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionResumedEvent/SubscriptionResumedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionResumedEvent.java
index 44801b10..ecb6f159 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionResumedEvent/SubscriptionResumedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionResumedEvent.java
@@ -5,19 +5,19 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionResumedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionResumedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionResumptionScheduledEvent/SubscriptionResumptionScheduledEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionResumptionScheduledEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionResumptionScheduledEvent/SubscriptionResumptionScheduledEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionResumptionScheduledEvent.java
index cde2d9a4..7eb4bb02 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionResumptionScheduledEvent/SubscriptionResumptionScheduledEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionResumptionScheduledEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionResumptionScheduledEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionResumptionScheduledEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionScheduledCancellationRemovedEvent/SubscriptionScheduledCancellationRemovedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionScheduledCancellationRemovedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionScheduledCancellationRemovedEvent/SubscriptionScheduledCancellationRemovedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionScheduledCancellationRemovedEvent.java
index a38ecd28..816ed1a5 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionScheduledCancellationRemovedEvent/SubscriptionScheduledCancellationRemovedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionScheduledCancellationRemovedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionScheduledCancellationRemovedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionScheduledCancellationRemovedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionScheduledChangesRemovedEvent/SubscriptionScheduledChangesRemovedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionScheduledChangesRemovedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionScheduledChangesRemovedEvent/SubscriptionScheduledChangesRemovedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionScheduledChangesRemovedEvent.java
index acd6b8fc..016dbe25 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionScheduledChangesRemovedEvent/SubscriptionScheduledChangesRemovedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionScheduledChangesRemovedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionScheduledChangesRemovedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionScheduledChangesRemovedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionScheduledPauseRemovedEvent/SubscriptionScheduledPauseRemovedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionScheduledPauseRemovedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionScheduledPauseRemovedEvent/SubscriptionScheduledPauseRemovedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionScheduledPauseRemovedEvent.java
index f2a27855..d6d14f42 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionScheduledPauseRemovedEvent/SubscriptionScheduledPauseRemovedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionScheduledPauseRemovedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionScheduledPauseRemovedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionScheduledPauseRemovedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionScheduledResumptionRemovedEvent/SubscriptionScheduledResumptionRemovedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionScheduledResumptionRemovedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionScheduledResumptionRemovedEvent/SubscriptionScheduledResumptionRemovedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionScheduledResumptionRemovedEvent.java
index b58d4cd1..131b6c6a 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionScheduledResumptionRemovedEvent/SubscriptionScheduledResumptionRemovedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionScheduledResumptionRemovedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionScheduledResumptionRemovedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionScheduledResumptionRemovedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionShippingAddressUpdatedEvent/SubscriptionShippingAddressUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionShippingAddressUpdatedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionShippingAddressUpdatedEvent/SubscriptionShippingAddressUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionShippingAddressUpdatedEvent.java
index 57d2b168..33277f7e 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionShippingAddressUpdatedEvent/SubscriptionShippingAddressUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionShippingAddressUpdatedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionShippingAddressUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionShippingAddressUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionStartedEvent/SubscriptionStartedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionStartedEvent.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionStartedEvent/SubscriptionStartedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionStartedEvent.java
index 12b859ce..00e5b502 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionStartedEvent/SubscriptionStartedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionStartedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionStartedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class SubscriptionStartedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionTrialEndReminderEvent/SubscriptionTrialEndReminderEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionTrialEndReminderEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionTrialEndReminderEvent/SubscriptionTrialEndReminderEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionTrialEndReminderEvent.java
index b9cc55de..7777daf5 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionTrialEndReminderEvent/SubscriptionTrialEndReminderEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionTrialEndReminderEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionTrialEndReminderEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionTrialEndReminderEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionTrialExtendedEvent/SubscriptionTrialExtendedEvent.java b/src/main/java/com/chargebee/v4/models/event/SubscriptionTrialExtendedEvent.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionTrialExtendedEvent/SubscriptionTrialExtendedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/SubscriptionTrialExtendedEvent.java
index 574301b1..ac20b25c 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionTrialExtendedEvent/SubscriptionTrialExtendedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/SubscriptionTrialExtendedEvent.java
@@ -5,17 +5,17 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionTrialExtendedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.card.Card;
 
 public class SubscriptionTrialExtendedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/taxWithheldDeletedEvent/TaxWithheldDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/TaxWithheldDeletedEvent.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/taxWithheldDeletedEvent/TaxWithheldDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/TaxWithheldDeletedEvent.java
index 83df4ce3..f677924f 100644
--- a/src/main/java/com/chargebee/v4/core/models/taxWithheldDeletedEvent/TaxWithheldDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/TaxWithheldDeletedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.taxWithheldDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.taxWithheld.TaxWithheld;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.taxWithheld.TaxWithheld;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class TaxWithheldDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/taxWithheldRecordedEvent/TaxWithheldRecordedEvent.java b/src/main/java/com/chargebee/v4/models/event/TaxWithheldRecordedEvent.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/taxWithheldRecordedEvent/TaxWithheldRecordedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/TaxWithheldRecordedEvent.java
index bb3d787a..79f7cc9a 100644
--- a/src/main/java/com/chargebee/v4/core/models/taxWithheldRecordedEvent/TaxWithheldRecordedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/TaxWithheldRecordedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.taxWithheldRecordedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.taxWithheld.TaxWithheld;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.taxWithheld.TaxWithheld;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class TaxWithheldRecordedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/taxWithheldRefundedEvent/TaxWithheldRefundedEvent.java b/src/main/java/com/chargebee/v4/models/event/TaxWithheldRefundedEvent.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/taxWithheldRefundedEvent/TaxWithheldRefundedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/TaxWithheldRefundedEvent.java
index 6594f6e9..161c69d0 100644
--- a/src/main/java/com/chargebee/v4/core/models/taxWithheldRefundedEvent/TaxWithheldRefundedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/TaxWithheldRefundedEvent.java
@@ -5,15 +5,15 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.taxWithheldRefundedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.taxWithheld.TaxWithheld;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.taxWithheld.TaxWithheld;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class TaxWithheldRefundedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/tokenConsumedEvent/TokenConsumedEvent.java b/src/main/java/com/chargebee/v4/models/event/TokenConsumedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/tokenConsumedEvent/TokenConsumedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/TokenConsumedEvent.java
index ea13f4b3..9217503d 100644
--- a/src/main/java/com/chargebee/v4/core/models/tokenConsumedEvent/TokenConsumedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/TokenConsumedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.tokenConsumedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.token.Token;
+import com.chargebee.v4.models.token.Token;
 
 public class TokenConsumedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/tokenCreatedEvent/TokenCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/TokenCreatedEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/tokenCreatedEvent/TokenCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/TokenCreatedEvent.java
index f2712f21..ec17000a 100644
--- a/src/main/java/com/chargebee/v4/core/models/tokenCreatedEvent/TokenCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/TokenCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.tokenCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.token.Token;
+import com.chargebee.v4.models.token.Token;
 
 public class TokenCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/tokenExpiredEvent/TokenExpiredEvent.java b/src/main/java/com/chargebee/v4/models/event/TokenExpiredEvent.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/tokenExpiredEvent/TokenExpiredEvent.java
rename to src/main/java/com/chargebee/v4/models/event/TokenExpiredEvent.java
index aa1e9cac..41ac57b4 100644
--- a/src/main/java/com/chargebee/v4/core/models/tokenExpiredEvent/TokenExpiredEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/TokenExpiredEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.tokenExpiredEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.token.Token;
+import com.chargebee.v4.models.token.Token;
 
 public class TokenExpiredEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/transactionCreatedEvent/TransactionCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/TransactionCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/transactionCreatedEvent/TransactionCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/TransactionCreatedEvent.java
index 9d23e5ff..6de0db9d 100644
--- a/src/main/java/com/chargebee/v4/core/models/transactionCreatedEvent/TransactionCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/TransactionCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.transactionCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
 public class TransactionCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/transactionDeletedEvent/TransactionDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/TransactionDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/transactionDeletedEvent/TransactionDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/TransactionDeletedEvent.java
index 4aa64bc5..dc5ae16e 100644
--- a/src/main/java/com/chargebee/v4/core/models/transactionDeletedEvent/TransactionDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/TransactionDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.transactionDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
 public class TransactionDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/transactionUpdatedEvent/TransactionUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/TransactionUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/transactionUpdatedEvent/TransactionUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/TransactionUpdatedEvent.java
index 8d8a9d38..a5d34777 100644
--- a/src/main/java/com/chargebee/v4/core/models/transactionUpdatedEvent/TransactionUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/TransactionUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.transactionUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
 public class TransactionUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/unbilledChargesCreatedEvent/UnbilledChargesCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/UnbilledChargesCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/unbilledChargesCreatedEvent/UnbilledChargesCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/UnbilledChargesCreatedEvent.java
index 195920c9..d45dc6f5 100644
--- a/src/main/java/com/chargebee/v4/core/models/unbilledChargesCreatedEvent/UnbilledChargesCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/UnbilledChargesCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.unbilledChargesCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
 public class UnbilledChargesCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/unbilledChargesDeletedEvent/UnbilledChargesDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/UnbilledChargesDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/unbilledChargesDeletedEvent/UnbilledChargesDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/UnbilledChargesDeletedEvent.java
index 3fe395b0..26575cc9 100644
--- a/src/main/java/com/chargebee/v4/core/models/unbilledChargesDeletedEvent/UnbilledChargesDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/UnbilledChargesDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.unbilledChargesDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
 public class UnbilledChargesDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/unbilledChargesInvoicedEvent/UnbilledChargesInvoicedEvent.java b/src/main/java/com/chargebee/v4/models/event/UnbilledChargesInvoicedEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/unbilledChargesInvoicedEvent/UnbilledChargesInvoicedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/UnbilledChargesInvoicedEvent.java
index 1f9a608c..d16032ba 100644
--- a/src/main/java/com/chargebee/v4/core/models/unbilledChargesInvoicedEvent/UnbilledChargesInvoicedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/UnbilledChargesInvoicedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.unbilledChargesInvoicedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.invoice.Invoice;
 
 public class UnbilledChargesInvoicedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/unbilledChargesVoidedEvent/UnbilledChargesVoidedEvent.java b/src/main/java/com/chargebee/v4/models/event/UnbilledChargesVoidedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/unbilledChargesVoidedEvent/UnbilledChargesVoidedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/UnbilledChargesVoidedEvent.java
index f0da096e..33f20556 100644
--- a/src/main/java/com/chargebee/v4/core/models/unbilledChargesVoidedEvent/UnbilledChargesVoidedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/UnbilledChargesVoidedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.unbilledChargesVoidedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
 public class UnbilledChargesVoidedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/usageFileIngestedEvent/UsageFileIngestedEvent.java b/src/main/java/com/chargebee/v4/models/event/UsageFileIngestedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/usageFileIngestedEvent/UsageFileIngestedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/UsageFileIngestedEvent.java
index 31156f70..d6023788 100644
--- a/src/main/java/com/chargebee/v4/core/models/usageFileIngestedEvent/UsageFileIngestedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/UsageFileIngestedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.usageFileIngestedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.usageFile.UsageFile;
+import com.chargebee.v4.models.usageFile.UsageFile;
 
 public class UsageFileIngestedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/variantCreatedEvent/VariantCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/VariantCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/variantCreatedEvent/VariantCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/VariantCreatedEvent.java
index e063869e..a7e4d973 100644
--- a/src/main/java/com/chargebee/v4/core/models/variantCreatedEvent/VariantCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/VariantCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.variantCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.variant.Variant;
+import com.chargebee.v4.models.variant.Variant;
 
 public class VariantCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/variantDeletedEvent/VariantDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/VariantDeletedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/variantDeletedEvent/VariantDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/VariantDeletedEvent.java
index 2764b6b7..69b1aef9 100644
--- a/src/main/java/com/chargebee/v4/core/models/variantDeletedEvent/VariantDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/VariantDeletedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.variantDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.variant.Variant;
+import com.chargebee.v4.models.variant.Variant;
 
 public class VariantDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/variantUpdatedEvent/VariantUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/VariantUpdatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/variantUpdatedEvent/VariantUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/VariantUpdatedEvent.java
index eec7ecad..c458a9b7 100644
--- a/src/main/java/com/chargebee/v4/core/models/variantUpdatedEvent/VariantUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/VariantUpdatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.variantUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.variant.Variant;
+import com.chargebee.v4.models.variant.Variant;
 
 public class VariantUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/virtualBankAccountAddedEvent/VirtualBankAccountAddedEvent.java b/src/main/java/com/chargebee/v4/models/event/VirtualBankAccountAddedEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/virtualBankAccountAddedEvent/VirtualBankAccountAddedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/VirtualBankAccountAddedEvent.java
index 55d3e8a7..7a262aa1 100644
--- a/src/main/java/com/chargebee/v4/core/models/virtualBankAccountAddedEvent/VirtualBankAccountAddedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/VirtualBankAccountAddedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.virtualBankAccountAddedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.virtualBankAccount.VirtualBankAccount;
+import com.chargebee.v4.models.virtualBankAccount.VirtualBankAccount;
 
 public class VirtualBankAccountAddedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/virtualBankAccountDeletedEvent/VirtualBankAccountDeletedEvent.java b/src/main/java/com/chargebee/v4/models/event/VirtualBankAccountDeletedEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/virtualBankAccountDeletedEvent/VirtualBankAccountDeletedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/VirtualBankAccountDeletedEvent.java
index bc15426a..7c3e6e5e 100644
--- a/src/main/java/com/chargebee/v4/core/models/virtualBankAccountDeletedEvent/VirtualBankAccountDeletedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/VirtualBankAccountDeletedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.virtualBankAccountDeletedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.virtualBankAccount.VirtualBankAccount;
+import com.chargebee.v4.models.virtualBankAccount.VirtualBankAccount;
 
 public class VirtualBankAccountDeletedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/virtualBankAccountUpdatedEvent/VirtualBankAccountUpdatedEvent.java b/src/main/java/com/chargebee/v4/models/event/VirtualBankAccountUpdatedEvent.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/virtualBankAccountUpdatedEvent/VirtualBankAccountUpdatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/VirtualBankAccountUpdatedEvent.java
index 23524885..17738307 100644
--- a/src/main/java/com/chargebee/v4/core/models/virtualBankAccountUpdatedEvent/VirtualBankAccountUpdatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/VirtualBankAccountUpdatedEvent.java
@@ -5,13 +5,13 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.virtualBankAccountUpdatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.virtualBankAccount.VirtualBankAccount;
+import com.chargebee.v4.models.virtualBankAccount.VirtualBankAccount;
 
 public class VirtualBankAccountUpdatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/voucherCreateFailedEvent/VoucherCreateFailedEvent.java b/src/main/java/com/chargebee/v4/models/event/VoucherCreateFailedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/voucherCreateFailedEvent/VoucherCreateFailedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/VoucherCreateFailedEvent.java
index 1db7575c..e5f11a03 100644
--- a/src/main/java/com/chargebee/v4/core/models/voucherCreateFailedEvent/VoucherCreateFailedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/VoucherCreateFailedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.voucherCreateFailedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.paymentVoucher.PaymentVoucher;
+import com.chargebee.v4.models.paymentVoucher.PaymentVoucher;
 
 public class VoucherCreateFailedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/voucherCreatedEvent/VoucherCreatedEvent.java b/src/main/java/com/chargebee/v4/models/event/VoucherCreatedEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/voucherCreatedEvent/VoucherCreatedEvent.java
rename to src/main/java/com/chargebee/v4/models/event/VoucherCreatedEvent.java
index 748d23b2..78b62dde 100644
--- a/src/main/java/com/chargebee/v4/core/models/voucherCreatedEvent/VoucherCreatedEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/VoucherCreatedEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.voucherCreatedEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.paymentVoucher.PaymentVoucher;
+import com.chargebee.v4.models.paymentVoucher.PaymentVoucher;
 
 public class VoucherCreatedEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/voucherExpiredEvent/VoucherExpiredEvent.java b/src/main/java/com/chargebee/v4/models/event/VoucherExpiredEvent.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/voucherExpiredEvent/VoucherExpiredEvent.java
rename to src/main/java/com/chargebee/v4/models/event/VoucherExpiredEvent.java
index af01a4d8..51718e50 100644
--- a/src/main/java/com/chargebee/v4/core/models/voucherExpiredEvent/VoucherExpiredEvent.java
+++ b/src/main/java/com/chargebee/v4/models/event/VoucherExpiredEvent.java
@@ -5,11 +5,11 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.voucherExpiredEvent;
+package com.chargebee.v4.models.event;
 
 import com.chargebee.v4.internal.JsonUtil;
 
-import com.chargebee.v4.core.models.paymentVoucher.PaymentVoucher;
+import com.chargebee.v4.models.paymentVoucher.PaymentVoucher;
 
 public class VoucherExpiredEvent {
 
diff --git a/src/main/java/com/chargebee/v4/core/models/event/params/EventListParams.java b/src/main/java/com/chargebee/v4/models/event/params/EventListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/event/params/EventListParams.java
rename to src/main/java/com/chargebee/v4/models/event/params/EventListParams.java
index 9e7d6b74..4dcf6f67 100644
--- a/src/main/java/com/chargebee/v4/core/models/event/params/EventListParams.java
+++ b/src/main/java/com/chargebee/v4/models/event/params/EventListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.event.params;
+package com.chargebee.v4.models.event.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/event/params/EventRetrieveParams.java b/src/main/java/com/chargebee/v4/models/event/params/EventRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/event/params/EventRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/event/params/EventRetrieveParams.java
index 30ea3871..1724f6f2 100644
--- a/src/main/java/com/chargebee/v4/core/models/event/params/EventRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/event/params/EventRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.event.params;
+package com.chargebee.v4.models.event.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/event/EventListResponse.java b/src/main/java/com/chargebee/v4/models/event/responses/EventListResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/event/EventListResponse.java
rename to src/main/java/com/chargebee/v4/models/event/responses/EventListResponse.java
index e7e2ae42..343b6ca3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/event/EventListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/event/responses/EventListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.event;
+package com.chargebee.v4.models.event.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.event.Event;
+import com.chargebee.v4.models.event.Event;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.EventService;
-import com.chargebee.v4.core.models.event.params.EventListParams;
+import com.chargebee.v4.services.EventService;
+import com.chargebee.v4.models.event.params.EventListParams;
 
 /** Immutable response object for EventList operation. Contains paginated list data. */
 public final class EventListResponse {
@@ -95,9 +96,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public EventListResponse nextPage() throws Exception {
+  public EventListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/event/responses/EventRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/event/responses/EventRetrieveResponse.java
new file mode 100644
index 00000000..e893b2c4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/event/responses/EventRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.event.responses;
+
+import com.chargebee.v4.models.event.Event;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for EventRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class EventRetrieveResponse extends BaseResponse {
+  private final Event event;
+
+  private EventRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.event = builder.event;
+  }
+
+  /** Parse JSON response into EventRetrieveResponse object. */
+  public static EventRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into EventRetrieveResponse object with HTTP response. */
+  public static EventRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __eventJson = JsonUtil.getObject(json, "event");
+      if (__eventJson != null) {
+        builder.event(Event.fromJson(__eventJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse EventRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for EventRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for EventRetrieveResponse. */
+  public static class Builder {
+
+    private Event event;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder event(Event event) {
+      this.event = event;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public EventRetrieveResponse build() {
+      return new EventRetrieveResponse(this);
+    }
+  }
+
+  /** Get the event from the response. */
+  public Event getEvent() {
+    return event;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/Export.java b/src/main/java/com/chargebee/v4/models/export/Export.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/export/Export.java
rename to src/main/java/com/chargebee/v4/models/export/Export.java
index 87ae8b4d..2e069149 100644
--- a/src/main/java/com/chargebee/v4/core/models/export/Export.java
+++ b/src/main/java/com/chargebee/v4/models/export/Export.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.export;
+package com.chargebee.v4.models.export;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportAddonsParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportAddonsParams.java
new file mode 100644
index 00000000..e5e8819a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportAddonsParams.java
@@ -0,0 +1,1847 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportAddonsParams {
+
+  private final CurrencyCodeParams currencyCode;
+
+  private final AddonParams addon;
+
+  private ExportAddonsParams(ExportAddonsBuilder builder) {
+
+    this.currencyCode = builder.currencyCode;
+
+    this.addon = builder.addon;
+  }
+
+  public CurrencyCodeParams getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public AddonParams getAddon() {
+    return addon;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.currencyCode != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.currencyCode.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "currency_code[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addon != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.addon.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "addon[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportAddonsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportAddonsBuilder builder() {
+    return new ExportAddonsBuilder();
+  }
+
+  public static final class ExportAddonsBuilder {
+
+    private CurrencyCodeParams currencyCode;
+
+    private AddonParams addon;
+
+    private ExportAddonsBuilder() {}
+
+    public ExportAddonsBuilder currencyCode(CurrencyCodeParams value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public ExportAddonsBuilder addon(AddonParams value) {
+      this.addon = value;
+      return this;
+    }
+
+    public ExportAddonsParams build() {
+      return new ExportAddonsParams(this);
+    }
+  }
+
+  public static final class CurrencyCodeParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CurrencyCodeParams(CurrencyCodeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CurrencyCodeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CurrencyCodeBuilder builder() {
+      return new CurrencyCodeBuilder();
+    }
+
+    public static final class CurrencyCodeBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CurrencyCodeBuilder() {}
+
+      public CurrencyCodeBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CurrencyCodeParams build() {
+        return new CurrencyCodeParams(this);
+      }
+    }
+  }
+
+  public static final class AddonParams {
+
+    private final IdParams id;
+
+    private final NameParams name;
+
+    private final ChargeTypeParams chargeType;
+
+    private final PriceParams price;
+
+    private final PeriodParams period;
+
+    private final PeriodUnitParams periodUnit;
+
+    private final StatusParams status;
+
+    private final UpdatedAtParams updatedAt;
+
+    private final ChannelParams channel;
+
+    private AddonParams(AddonBuilder builder) {
+
+      this.id = builder.id;
+
+      this.name = builder.name;
+
+      this.chargeType = builder.chargeType;
+
+      this.price = builder.price;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.status = builder.status;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.channel = builder.channel;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public NameParams getName() {
+      return name;
+    }
+
+    public ChargeTypeParams getChargeType() {
+      return chargeType;
+    }
+
+    public PriceParams getPrice() {
+      return price;
+    }
+
+    public PeriodParams getPeriod() {
+      return period;
+    }
+
+    public PeriodUnitParams getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public StatusParams getStatus() {
+      return status;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public ChannelParams getChannel() {
+      return channel;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.name != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.name.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "name[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.chargeType != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.chargeType.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "charge_type[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.price != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.price.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "price[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.period != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.period.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "period[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.periodUnit != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.periodUnit.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "period_unit[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonBuilder builder() {
+      return new AddonBuilder();
+    }
+
+    public static final class AddonBuilder {
+
+      private IdParams id;
+
+      private NameParams name;
+
+      private ChargeTypeParams chargeType;
+
+      private PriceParams price;
+
+      private PeriodParams period;
+
+      private PeriodUnitParams periodUnit;
+
+      private StatusParams status;
+
+      private UpdatedAtParams updatedAt;
+
+      private ChannelParams channel;
+
+      private AddonBuilder() {}
+
+      public AddonBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonBuilder name(NameParams value) {
+        this.name = value;
+        return this;
+      }
+
+      public AddonBuilder chargeType(ChargeTypeParams value) {
+        this.chargeType = value;
+        return this;
+      }
+
+      public AddonBuilder price(PriceParams value) {
+        this.price = value;
+        return this;
+      }
+
+      public AddonBuilder period(PeriodParams value) {
+        this.period = value;
+        return this;
+      }
+
+      public AddonBuilder periodUnit(PeriodUnitParams value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public AddonBuilder status(StatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public AddonBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public AddonBuilder channel(ChannelParams value) {
+        this.channel = value;
+        return this;
+      }
+
+      public AddonParams build() {
+        return new AddonParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class NameParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private NameParams(NameBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NameParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NameBuilder builder() {
+      return new NameBuilder();
+    }
+
+    public static final class NameBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private NameBuilder() {}
+
+      public NameBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public NameBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public NameBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public NameBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public NameBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public NameParams build() {
+        return new NameParams(this);
+      }
+    }
+  }
+
+  public static final class ChargeTypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ChargeTypeParams(ChargeTypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargeTypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargeTypeBuilder builder() {
+      return new ChargeTypeBuilder();
+    }
+
+    public static final class ChargeTypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ChargeTypeBuilder() {}
+
+      public ChargeTypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ChargeTypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ChargeTypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ChargeTypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ChargeTypeParams build() {
+        return new ChargeTypeParams(this);
+      }
+    }
+
+    public enum Is {
+      RECURRING("recurring"),
+
+      NON_RECURRING("non_recurring"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      RECURRING("recurring"),
+
+      NON_RECURRING("non_recurring"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PriceParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private PriceParams(PriceBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PriceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PriceBuilder builder() {
+      return new PriceBuilder();
+    }
+
+    public static final class PriceBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private PriceBuilder() {}
+
+      public PriceBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PriceBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PriceBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public PriceBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public PriceBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public PriceBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public PriceBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public PriceParams build() {
+        return new PriceParams(this);
+      }
+    }
+  }
+
+  public static final class PeriodParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private PeriodParams(PeriodBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PeriodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PeriodBuilder builder() {
+      return new PeriodBuilder();
+    }
+
+    public static final class PeriodBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private PeriodBuilder() {}
+
+      public PeriodBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PeriodBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PeriodBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public PeriodBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public PeriodBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public PeriodBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public PeriodBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public PeriodParams build() {
+        return new PeriodParams(this);
+      }
+    }
+  }
+
+  public static final class PeriodUnitParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PeriodUnitParams(PeriodUnitBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PeriodUnitParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PeriodUnitBuilder builder() {
+      return new PeriodUnitBuilder();
+    }
+
+    public static final class PeriodUnitBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private PeriodUnitBuilder() {}
+
+      public PeriodUnitBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public PeriodUnitBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PeriodUnitBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PeriodUnitBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PeriodUnitParams build() {
+        return new PeriodUnitParams(this);
+      }
+    }
+
+    public enum Is {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      NOT_APPLICABLE("not_applicable"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      NOT_APPLICABLE("not_applicable"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private StatusParams(StatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatusBuilder builder() {
+      return new StatusBuilder();
+    }
+
+    public static final class StatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private StatusBuilder() {}
+
+      public StatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public StatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public StatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public StatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public StatusParams build() {
+        return new StatusParams(this);
+      }
+    }
+
+    public enum Is {
+      ACTIVE("active"),
+
+      ARCHIVED("archived"),
+
+      DELETED("deleted"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ACTIVE("active"),
+
+      ARCHIVED("archived"),
+
+      DELETED("deleted"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class ChannelParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ChannelParams(ChannelBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChannelParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChannelBuilder builder() {
+      return new ChannelBuilder();
+    }
+
+    public static final class ChannelBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ChannelBuilder() {}
+
+      public ChannelBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ChannelBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ChannelBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ChannelBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ChannelParams build() {
+        return new ChannelParams(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportAttachedItemsParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportAttachedItemsParams.java
new file mode 100644
index 00000000..c5ac3ade
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportAttachedItemsParams.java
@@ -0,0 +1,1276 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportAttachedItemsParams {
+
+  private final ItemTypeParams itemType;
+
+  private final AttachedItemParams attachedItem;
+
+  private ExportAttachedItemsParams(ExportAttachedItemsBuilder builder) {
+
+    this.itemType = builder.itemType;
+
+    this.attachedItem = builder.attachedItem;
+  }
+
+  public ItemTypeParams getItemType() {
+    return itemType;
+  }
+
+  public AttachedItemParams getAttachedItem() {
+    return attachedItem;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.itemType != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemType.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_type[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.attachedItem != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.attachedItem.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "attached_item[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportAttachedItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportAttachedItemsBuilder builder() {
+    return new ExportAttachedItemsBuilder();
+  }
+
+  public static final class ExportAttachedItemsBuilder {
+
+    private ItemTypeParams itemType;
+
+    private AttachedItemParams attachedItem;
+
+    private ExportAttachedItemsBuilder() {}
+
+    public ExportAttachedItemsBuilder itemType(ItemTypeParams value) {
+      this.itemType = value;
+      return this;
+    }
+
+    public ExportAttachedItemsBuilder attachedItem(AttachedItemParams value) {
+      this.attachedItem = value;
+      return this;
+    }
+
+    public ExportAttachedItemsParams build() {
+      return new ExportAttachedItemsParams(this);
+    }
+  }
+
+  public static final class ItemTypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemTypeParams(ItemTypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTypeBuilder builder() {
+      return new ItemTypeBuilder();
+    }
+
+    public static final class ItemTypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemTypeBuilder() {}
+
+      public ItemTypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemTypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemTypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemTypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemTypeParams build() {
+        return new ItemTypeParams(this);
+      }
+    }
+
+    public enum Is {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AttachedItemParams {
+
+    private final IdParams id;
+
+    private final ItemIdParams itemId;
+
+    private final TypeParams type;
+
+    private final ChargeOnEventParams chargeOnEvent;
+
+    private final UpdatedAtParams updatedAt;
+
+    private final ParentItemIdParams parentItemId;
+
+    private AttachedItemParams(AttachedItemBuilder builder) {
+
+      this.id = builder.id;
+
+      this.itemId = builder.itemId;
+
+      this.type = builder.type;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.parentItemId = builder.parentItemId;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public ItemIdParams getItemId() {
+      return itemId;
+    }
+
+    public TypeParams getType() {
+      return type;
+    }
+
+    public ChargeOnEventParams getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public ParentItemIdParams getParentItemId() {
+      return parentItemId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.itemId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.itemId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "item_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.type != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.type.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "type[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.chargeOnEvent.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "charge_on_event[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.parentItemId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.parentItemId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "parent_item_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AttachedItemParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AttachedItemBuilder builder() {
+      return new AttachedItemBuilder();
+    }
+
+    public static final class AttachedItemBuilder {
+
+      private IdParams id;
+
+      private ItemIdParams itemId;
+
+      private TypeParams type;
+
+      private ChargeOnEventParams chargeOnEvent;
+
+      private UpdatedAtParams updatedAt;
+
+      private ParentItemIdParams parentItemId;
+
+      private AttachedItemBuilder() {}
+
+      public AttachedItemBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public AttachedItemBuilder itemId(ItemIdParams value) {
+        this.itemId = value;
+        return this;
+      }
+
+      public AttachedItemBuilder type(TypeParams value) {
+        this.type = value;
+        return this;
+      }
+
+      public AttachedItemBuilder chargeOnEvent(ChargeOnEventParams value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public AttachedItemBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public AttachedItemBuilder parentItemId(ParentItemIdParams value) {
+        this.parentItemId = value;
+        return this;
+      }
+
+      public AttachedItemParams build() {
+        return new AttachedItemParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class ItemIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemIdParams(ItemIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemIdBuilder builder() {
+      return new ItemIdBuilder();
+    }
+
+    public static final class ItemIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemIdBuilder() {}
+
+      public ItemIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ItemIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemIdParams build() {
+        return new ItemIdParams(this);
+      }
+    }
+  }
+
+  public static final class TypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private TypeParams(TypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TypeBuilder builder() {
+      return new TypeBuilder();
+    }
+
+    public static final class TypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private TypeBuilder() {}
+
+      public TypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public TypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public TypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public TypeParams build() {
+        return new TypeParams(this);
+      }
+    }
+
+    public enum Is {
+      RECOMMENDED("recommended"),
+
+      MANDATORY("mandatory"),
+
+      OPTIONAL("optional"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      RECOMMENDED("recommended"),
+
+      MANDATORY("mandatory"),
+
+      OPTIONAL("optional"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChargeOnEventParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ChargeOnEventParams(ChargeOnEventBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargeOnEventParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargeOnEventBuilder builder() {
+      return new ChargeOnEventBuilder();
+    }
+
+    public static final class ChargeOnEventBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ChargeOnEventBuilder() {}
+
+      public ChargeOnEventBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ChargeOnEventBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ChargeOnEventBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ChargeOnEventBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ChargeOnEventParams build() {
+        return new ChargeOnEventParams(this);
+      }
+    }
+
+    public enum Is {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      ON_DEMAND("on_demand"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      ON_DEMAND("on_demand"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class ParentItemIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ParentItemIdParams(ParentItemIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ParentItemIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ParentItemIdBuilder builder() {
+      return new ParentItemIdBuilder();
+    }
+
+    public static final class ParentItemIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ParentItemIdBuilder() {}
+
+      public ParentItemIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ParentItemIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ParentItemIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ParentItemIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ParentItemIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ParentItemIdParams build() {
+        return new ParentItemIdParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportCouponsParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportCouponsParams.java
new file mode 100644
index 00000000..340c5b8d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportCouponsParams.java
@@ -0,0 +1,1602 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportCouponsParams {
+
+  private final CurrencyCodeParams currencyCode;
+
+  private final CouponParams coupon;
+
+  private ExportCouponsParams(ExportCouponsBuilder builder) {
+
+    this.currencyCode = builder.currencyCode;
+
+    this.coupon = builder.coupon;
+  }
+
+  public CurrencyCodeParams getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public CouponParams getCoupon() {
+    return coupon;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.currencyCode != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.currencyCode.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "currency_code[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.coupon != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.coupon.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "coupon[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportCouponsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportCouponsBuilder builder() {
+    return new ExportCouponsBuilder();
+  }
+
+  public static final class ExportCouponsBuilder {
+
+    private CurrencyCodeParams currencyCode;
+
+    private CouponParams coupon;
+
+    private ExportCouponsBuilder() {}
+
+    public ExportCouponsBuilder currencyCode(CurrencyCodeParams value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public ExportCouponsBuilder coupon(CouponParams value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public ExportCouponsParams build() {
+      return new ExportCouponsParams(this);
+    }
+  }
+
+  public static final class CurrencyCodeParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CurrencyCodeParams(CurrencyCodeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CurrencyCodeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CurrencyCodeBuilder builder() {
+      return new CurrencyCodeBuilder();
+    }
+
+    public static final class CurrencyCodeBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CurrencyCodeBuilder() {}
+
+      public CurrencyCodeBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CurrencyCodeParams build() {
+        return new CurrencyCodeParams(this);
+      }
+    }
+  }
+
+  public static final class CouponParams {
+
+    private final IdParams id;
+
+    private final NameParams name;
+
+    private final DiscountTypeParams discountType;
+
+    private final DurationTypeParams durationType;
+
+    private final StatusParams status;
+
+    private final ApplyOnParams applyOn;
+
+    private final CreatedAtParams createdAt;
+
+    private final UpdatedAtParams updatedAt;
+
+    private CouponParams(CouponBuilder builder) {
+
+      this.id = builder.id;
+
+      this.name = builder.name;
+
+      this.discountType = builder.discountType;
+
+      this.durationType = builder.durationType;
+
+      this.status = builder.status;
+
+      this.applyOn = builder.applyOn;
+
+      this.createdAt = builder.createdAt;
+
+      this.updatedAt = builder.updatedAt;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public NameParams getName() {
+      return name;
+    }
+
+    public DiscountTypeParams getDiscountType() {
+      return discountType;
+    }
+
+    public DurationTypeParams getDurationType() {
+      return durationType;
+    }
+
+    public StatusParams getStatus() {
+      return status;
+    }
+
+    public ApplyOnParams getApplyOn() {
+      return applyOn;
+    }
+
+    public CreatedAtParams getCreatedAt() {
+      return createdAt;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.name != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.name.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "name[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.discountType != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.discountType.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "discount_type[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.durationType != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.durationType.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "duration_type[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.applyOn != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.applyOn.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "apply_on[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.createdAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.createdAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "created_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponBuilder builder() {
+      return new CouponBuilder();
+    }
+
+    public static final class CouponBuilder {
+
+      private IdParams id;
+
+      private NameParams name;
+
+      private DiscountTypeParams discountType;
+
+      private DurationTypeParams durationType;
+
+      private StatusParams status;
+
+      private ApplyOnParams applyOn;
+
+      private CreatedAtParams createdAt;
+
+      private UpdatedAtParams updatedAt;
+
+      private CouponBuilder() {}
+
+      public CouponBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public CouponBuilder name(NameParams value) {
+        this.name = value;
+        return this;
+      }
+
+      public CouponBuilder discountType(DiscountTypeParams value) {
+        this.discountType = value;
+        return this;
+      }
+
+      public CouponBuilder durationType(DurationTypeParams value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public CouponBuilder status(StatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public CouponBuilder applyOn(ApplyOnParams value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public CouponBuilder createdAt(CreatedAtParams value) {
+        this.createdAt = value;
+        return this;
+      }
+
+      public CouponBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public CouponParams build() {
+        return new CouponParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class NameParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private NameParams(NameBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NameParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NameBuilder builder() {
+      return new NameBuilder();
+    }
+
+    public static final class NameBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private NameBuilder() {}
+
+      public NameBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public NameBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public NameBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public NameBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public NameBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public NameParams build() {
+        return new NameParams(this);
+      }
+    }
+  }
+
+  public static final class DiscountTypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private DiscountTypeParams(DiscountTypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountTypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountTypeBuilder builder() {
+      return new DiscountTypeBuilder();
+    }
+
+    public static final class DiscountTypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private DiscountTypeBuilder() {}
+
+      public DiscountTypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public DiscountTypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public DiscountTypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public DiscountTypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public DiscountTypeParams build() {
+        return new DiscountTypeParams(this);
+      }
+    }
+
+    public enum Is {
+      FIXED_AMOUNT("fixed_amount"),
+
+      PERCENTAGE("percentage"),
+
+      OFFER_QUANTITY("offer_quantity"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      FIXED_AMOUNT("fixed_amount"),
+
+      PERCENTAGE("percentage"),
+
+      OFFER_QUANTITY("offer_quantity"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DurationTypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private DurationTypeParams(DurationTypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DurationTypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DurationTypeBuilder builder() {
+      return new DurationTypeBuilder();
+    }
+
+    public static final class DurationTypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private DurationTypeBuilder() {}
+
+      public DurationTypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public DurationTypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public DurationTypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public DurationTypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public DurationTypeParams build() {
+        return new DurationTypeParams(this);
+      }
+    }
+
+    public enum Is {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private StatusParams(StatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatusBuilder builder() {
+      return new StatusBuilder();
+    }
+
+    public static final class StatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private StatusBuilder() {}
+
+      public StatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public StatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public StatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public StatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public StatusParams build() {
+        return new StatusParams(this);
+      }
+    }
+
+    public enum Is {
+      ACTIVE("active"),
+
+      EXPIRED("expired"),
+
+      ARCHIVED("archived"),
+
+      DELETED("deleted"),
+
+      FUTURE("future"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ACTIVE("active"),
+
+      EXPIRED("expired"),
+
+      ARCHIVED("archived"),
+
+      DELETED("deleted"),
+
+      FUTURE("future"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ApplyOnParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ApplyOnParams(ApplyOnBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ApplyOnParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ApplyOnBuilder builder() {
+      return new ApplyOnBuilder();
+    }
+
+    public static final class ApplyOnBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ApplyOnBuilder() {}
+
+      public ApplyOnBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ApplyOnBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ApplyOnBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ApplyOnBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ApplyOnParams build() {
+        return new ApplyOnParams(this);
+      }
+    }
+
+    public enum Is {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIED_ITEMS_TOTAL("specified_items_total"),
+
+      EACH_SPECIFIED_ITEM("each_specified_item"),
+
+      EACH_UNIT_OF_SPECIFIED_ITEMS("each_unit_of_specified_items"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIED_ITEMS_TOTAL("specified_items_total"),
+
+      EACH_SPECIFIED_ITEM("each_specified_item"),
+
+      EACH_UNIT_OF_SPECIFIED_ITEMS("each_unit_of_specified_items"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CreatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private CreatedAtParams(CreatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreatedAtBuilder builder() {
+      return new CreatedAtBuilder();
+    }
+
+    public static final class CreatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private CreatedAtBuilder() {}
+
+      public CreatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public CreatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public CreatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public CreatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public CreatedAtParams build() {
+        return new CreatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportCreditNotesParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportCreditNotesParams.java
new file mode 100644
index 00000000..e14949e2
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportCreditNotesParams.java
@@ -0,0 +1,3126 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportCreditNotesParams {
+
+  private final CreditNoteParams creditNote;
+
+  private ExportCreditNotesParams(ExportCreditNotesBuilder builder) {
+
+    this.creditNote = builder.creditNote;
+  }
+
+  public CreditNoteParams getCreditNote() {
+    return creditNote;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.creditNote != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.creditNote.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "credit_note[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportCreditNotesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportCreditNotesBuilder builder() {
+    return new ExportCreditNotesBuilder();
+  }
+
+  public static final class ExportCreditNotesBuilder {
+
+    private CreditNoteParams creditNote;
+
+    private ExportCreditNotesBuilder() {}
+
+    public ExportCreditNotesBuilder creditNote(CreditNoteParams value) {
+      this.creditNote = value;
+      return this;
+    }
+
+    public ExportCreditNotesParams build() {
+      return new ExportCreditNotesParams(this);
+    }
+  }
+
+  public static final class CreditNoteParams {
+
+    private final IdParams id;
+
+    private final CustomerIdParams customerId;
+
+    private final SubscriptionIdParams subscriptionId;
+
+    private final ReferenceInvoiceIdParams referenceInvoiceId;
+
+    private final TypeParams type;
+
+    private final ReasonCodeParams reasonCode;
+
+    private final CreateReasonCodeParams createReasonCode;
+
+    private final StatusParams status;
+
+    private final DateParams date;
+
+    private final TotalParams total;
+
+    private final PriceTypeParams priceType;
+
+    private final AmountAllocatedParams amountAllocated;
+
+    private final AmountRefundedParams amountRefunded;
+
+    private final AmountAvailableParams amountAvailable;
+
+    private final VoidedAtParams voidedAt;
+
+    private final UpdatedAtParams updatedAt;
+
+    private final ChannelParams channel;
+
+    private CreditNoteParams(CreditNoteBuilder builder) {
+
+      this.id = builder.id;
+
+      this.customerId = builder.customerId;
+
+      this.subscriptionId = builder.subscriptionId;
+
+      this.referenceInvoiceId = builder.referenceInvoiceId;
+
+      this.type = builder.type;
+
+      this.reasonCode = builder.reasonCode;
+
+      this.createReasonCode = builder.createReasonCode;
+
+      this.status = builder.status;
+
+      this.date = builder.date;
+
+      this.total = builder.total;
+
+      this.priceType = builder.priceType;
+
+      this.amountAllocated = builder.amountAllocated;
+
+      this.amountRefunded = builder.amountRefunded;
+
+      this.amountAvailable = builder.amountAvailable;
+
+      this.voidedAt = builder.voidedAt;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.channel = builder.channel;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public CustomerIdParams getCustomerId() {
+      return customerId;
+    }
+
+    public SubscriptionIdParams getSubscriptionId() {
+      return subscriptionId;
+    }
+
+    public ReferenceInvoiceIdParams getReferenceInvoiceId() {
+      return referenceInvoiceId;
+    }
+
+    public TypeParams getType() {
+      return type;
+    }
+
+    public ReasonCodeParams getReasonCode() {
+      return reasonCode;
+    }
+
+    public CreateReasonCodeParams getCreateReasonCode() {
+      return createReasonCode;
+    }
+
+    public StatusParams getStatus() {
+      return status;
+    }
+
+    public DateParams getDate() {
+      return date;
+    }
+
+    public TotalParams getTotal() {
+      return total;
+    }
+
+    public PriceTypeParams getPriceType() {
+      return priceType;
+    }
+
+    public AmountAllocatedParams getAmountAllocated() {
+      return amountAllocated;
+    }
+
+    public AmountRefundedParams getAmountRefunded() {
+      return amountRefunded;
+    }
+
+    public AmountAvailableParams getAmountAvailable() {
+      return amountAvailable;
+    }
+
+    public VoidedAtParams getVoidedAt() {
+      return voidedAt;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public ChannelParams getChannel() {
+      return channel;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.customerId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.customerId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "customer_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.subscriptionId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.subscriptionId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "subscription_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.referenceInvoiceId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.referenceInvoiceId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "reference_invoice_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.type != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.type.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "type[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.reasonCode != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.reasonCode.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "reason_code[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.createReasonCode != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.createReasonCode.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "create_reason_code[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.date != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.date.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "date[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.total != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.total.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "total[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.priceType != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.priceType.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "price_type[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountAllocated != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountAllocated.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_allocated[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountRefunded != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountRefunded.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_refunded[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountAvailable != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountAvailable.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_available[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.voidedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.voidedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "voided_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreditNoteParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreditNoteBuilder builder() {
+      return new CreditNoteBuilder();
+    }
+
+    public static final class CreditNoteBuilder {
+
+      private IdParams id;
+
+      private CustomerIdParams customerId;
+
+      private SubscriptionIdParams subscriptionId;
+
+      private ReferenceInvoiceIdParams referenceInvoiceId;
+
+      private TypeParams type;
+
+      private ReasonCodeParams reasonCode;
+
+      private CreateReasonCodeParams createReasonCode;
+
+      private StatusParams status;
+
+      private DateParams date;
+
+      private TotalParams total;
+
+      private PriceTypeParams priceType;
+
+      private AmountAllocatedParams amountAllocated;
+
+      private AmountRefundedParams amountRefunded;
+
+      private AmountAvailableParams amountAvailable;
+
+      private VoidedAtParams voidedAt;
+
+      private UpdatedAtParams updatedAt;
+
+      private ChannelParams channel;
+
+      private CreditNoteBuilder() {}
+
+      public CreditNoteBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public CreditNoteBuilder customerId(CustomerIdParams value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public CreditNoteBuilder subscriptionId(SubscriptionIdParams value) {
+        this.subscriptionId = value;
+        return this;
+      }
+
+      public CreditNoteBuilder referenceInvoiceId(ReferenceInvoiceIdParams value) {
+        this.referenceInvoiceId = value;
+        return this;
+      }
+
+      public CreditNoteBuilder type(TypeParams value) {
+        this.type = value;
+        return this;
+      }
+
+      public CreditNoteBuilder reasonCode(ReasonCodeParams value) {
+        this.reasonCode = value;
+        return this;
+      }
+
+      public CreditNoteBuilder createReasonCode(CreateReasonCodeParams value) {
+        this.createReasonCode = value;
+        return this;
+      }
+
+      public CreditNoteBuilder status(StatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public CreditNoteBuilder date(DateParams value) {
+        this.date = value;
+        return this;
+      }
+
+      public CreditNoteBuilder total(TotalParams value) {
+        this.total = value;
+        return this;
+      }
+
+      public CreditNoteBuilder priceType(PriceTypeParams value) {
+        this.priceType = value;
+        return this;
+      }
+
+      public CreditNoteBuilder amountAllocated(AmountAllocatedParams value) {
+        this.amountAllocated = value;
+        return this;
+      }
+
+      public CreditNoteBuilder amountRefunded(AmountRefundedParams value) {
+        this.amountRefunded = value;
+        return this;
+      }
+
+      public CreditNoteBuilder amountAvailable(AmountAvailableParams value) {
+        this.amountAvailable = value;
+        return this;
+      }
+
+      public CreditNoteBuilder voidedAt(VoidedAtParams value) {
+        this.voidedAt = value;
+        return this;
+      }
+
+      public CreditNoteBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public CreditNoteBuilder channel(ChannelParams value) {
+        this.channel = value;
+        return this;
+      }
+
+      public CreditNoteParams build() {
+        return new CreditNoteParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CustomerIdParams(CustomerIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerIdBuilder builder() {
+      return new CustomerIdBuilder();
+    }
+
+    public static final class CustomerIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CustomerIdBuilder() {}
+
+      public CustomerIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CustomerIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CustomerIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CustomerIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CustomerIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CustomerIdParams build() {
+        return new CustomerIdParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private final String in;
+
+    private final String notIn;
+
+    private SubscriptionIdParams(SubscriptionIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionIdBuilder builder() {
+      return new SubscriptionIdBuilder();
+    }
+
+    public static final class SubscriptionIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private String in;
+
+      private String notIn;
+
+      private SubscriptionIdBuilder() {}
+
+      public SubscriptionIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public SubscriptionIdParams build() {
+        return new SubscriptionIdParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ReferenceInvoiceIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ReferenceInvoiceIdParams(ReferenceInvoiceIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ReferenceInvoiceIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ReferenceInvoiceIdBuilder builder() {
+      return new ReferenceInvoiceIdBuilder();
+    }
+
+    public static final class ReferenceInvoiceIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private String in;
+
+      private String notIn;
+
+      private ReferenceInvoiceIdBuilder() {}
+
+      public ReferenceInvoiceIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ReferenceInvoiceIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ReferenceInvoiceIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ReferenceInvoiceIdBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public ReferenceInvoiceIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ReferenceInvoiceIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ReferenceInvoiceIdParams build() {
+        return new ReferenceInvoiceIdParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private TypeParams(TypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TypeBuilder builder() {
+      return new TypeBuilder();
+    }
+
+    public static final class TypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private TypeBuilder() {}
+
+      public TypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public TypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public TypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public TypeParams build() {
+        return new TypeParams(this);
+      }
+    }
+
+    public enum Is {
+      ADJUSTMENT("adjustment"),
+
+      REFUNDABLE("refundable"),
+
+      STORE("store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ADJUSTMENT("adjustment"),
+
+      REFUNDABLE("refundable"),
+
+      STORE("store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ReasonCodeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ReasonCodeParams(ReasonCodeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ReasonCodeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ReasonCodeBuilder builder() {
+      return new ReasonCodeBuilder();
+    }
+
+    public static final class ReasonCodeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ReasonCodeBuilder() {}
+
+      public ReasonCodeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ReasonCodeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ReasonCodeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ReasonCodeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ReasonCodeParams build() {
+        return new ReasonCodeParams(this);
+      }
+    }
+
+    public enum Is {
+      WRITE_OFF("write_off"),
+
+      SUBSCRIPTION_CHANGE("subscription_change"),
+
+      SUBSCRIPTION_CANCELLATION("subscription_cancellation"),
+
+      SUBSCRIPTION_PAUSE("subscription_pause"),
+
+      CHARGEBACK("chargeback"),
+
+      PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
+
+      SERVICE_UNSATISFACTORY("service_unsatisfactory"),
+
+      ORDER_CHANGE("order_change"),
+
+      ORDER_CANCELLATION("order_cancellation"),
+
+      WAIVER("waiver"),
+
+      OTHER("other"),
+
+      FRAUDULENT("fraudulent"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WRITE_OFF("write_off"),
+
+      SUBSCRIPTION_CHANGE("subscription_change"),
+
+      SUBSCRIPTION_CANCELLATION("subscription_cancellation"),
+
+      SUBSCRIPTION_PAUSE("subscription_pause"),
+
+      CHARGEBACK("chargeback"),
+
+      PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
+
+      SERVICE_UNSATISFACTORY("service_unsatisfactory"),
+
+      ORDER_CHANGE("order_change"),
+
+      ORDER_CANCELLATION("order_cancellation"),
+
+      WAIVER("waiver"),
+
+      OTHER("other"),
+
+      FRAUDULENT("fraudulent"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CreateReasonCodeParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CreateReasonCodeParams(CreateReasonCodeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreateReasonCodeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreateReasonCodeBuilder builder() {
+      return new CreateReasonCodeBuilder();
+    }
+
+    public static final class CreateReasonCodeBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CreateReasonCodeBuilder() {}
+
+      public CreateReasonCodeBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CreateReasonCodeBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CreateReasonCodeBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CreateReasonCodeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CreateReasonCodeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CreateReasonCodeParams build() {
+        return new CreateReasonCodeParams(this);
+      }
+    }
+  }
+
+  public static final class StatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private StatusParams(StatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatusBuilder builder() {
+      return new StatusBuilder();
+    }
+
+    public static final class StatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private StatusBuilder() {}
+
+      public StatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public StatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public StatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public StatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public StatusParams build() {
+        return new StatusParams(this);
+      }
+    }
+
+    public enum Is {
+      ADJUSTED("adjusted"),
+
+      REFUNDED("refunded"),
+
+      REFUND_DUE("refund_due"),
+
+      VOIDED("voided"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ADJUSTED("adjusted"),
+
+      REFUNDED("refunded"),
+
+      REFUND_DUE("refund_due"),
+
+      VOIDED("voided"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DateParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private DateParams(DateBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DateParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DateBuilder builder() {
+      return new DateBuilder();
+    }
+
+    public static final class DateBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private DateBuilder() {}
+
+      public DateBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public DateBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public DateBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public DateBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public DateParams build() {
+        return new DateParams(this);
+      }
+    }
+  }
+
+  public static final class TotalParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private TotalParams(TotalBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TotalParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TotalBuilder builder() {
+      return new TotalBuilder();
+    }
+
+    public static final class TotalBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private TotalBuilder() {}
+
+      public TotalBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public TotalBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TotalBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public TotalBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public TotalBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public TotalBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public TotalBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public TotalParams build() {
+        return new TotalParams(this);
+      }
+    }
+  }
+
+  public static final class PriceTypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PriceTypeParams(PriceTypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PriceTypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PriceTypeBuilder builder() {
+      return new PriceTypeBuilder();
+    }
+
+    public static final class PriceTypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private PriceTypeBuilder() {}
+
+      public PriceTypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public PriceTypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PriceTypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PriceTypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PriceTypeParams build() {
+        return new PriceTypeParams(this);
+      }
+    }
+
+    public enum Is {
+      TAX_EXCLUSIVE("tax_exclusive"),
+
+      TAX_INCLUSIVE("tax_inclusive"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      TAX_EXCLUSIVE("tax_exclusive"),
+
+      TAX_INCLUSIVE("tax_inclusive"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AmountAllocatedParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountAllocatedParams(AmountAllocatedBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountAllocatedParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountAllocatedBuilder builder() {
+      return new AmountAllocatedBuilder();
+    }
+
+    public static final class AmountAllocatedBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountAllocatedBuilder() {}
+
+      public AmountAllocatedBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountAllocatedBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountAllocatedBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountAllocatedBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountAllocatedBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountAllocatedBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountAllocatedBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountAllocatedParams build() {
+        return new AmountAllocatedParams(this);
+      }
+    }
+  }
+
+  public static final class AmountRefundedParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountRefundedParams(AmountRefundedBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountRefundedParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountRefundedBuilder builder() {
+      return new AmountRefundedBuilder();
+    }
+
+    public static final class AmountRefundedBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountRefundedBuilder() {}
+
+      public AmountRefundedBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountRefundedBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountRefundedBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountRefundedBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountRefundedBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountRefundedBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountRefundedBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountRefundedParams build() {
+        return new AmountRefundedParams(this);
+      }
+    }
+  }
+
+  public static final class AmountAvailableParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountAvailableParams(AmountAvailableBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountAvailableParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountAvailableBuilder builder() {
+      return new AmountAvailableBuilder();
+    }
+
+    public static final class AmountAvailableBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountAvailableBuilder() {}
+
+      public AmountAvailableBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountAvailableBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountAvailableBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountAvailableBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountAvailableBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountAvailableBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountAvailableBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountAvailableParams build() {
+        return new AmountAvailableParams(this);
+      }
+    }
+  }
+
+  public static final class VoidedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private VoidedAtParams(VoidedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for VoidedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static VoidedAtBuilder builder() {
+      return new VoidedAtBuilder();
+    }
+
+    public static final class VoidedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private VoidedAtBuilder() {}
+
+      public VoidedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public VoidedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public VoidedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public VoidedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public VoidedAtParams build() {
+        return new VoidedAtParams(this);
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class ChannelParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ChannelParams(ChannelBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChannelParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChannelBuilder builder() {
+      return new ChannelBuilder();
+    }
+
+    public static final class ChannelBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ChannelBuilder() {}
+
+      public ChannelBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ChannelBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ChannelBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ChannelBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ChannelParams build() {
+        return new ChannelParams(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportCustomersParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportCustomersParams.java
new file mode 100644
index 00000000..73747fbd
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportCustomersParams.java
@@ -0,0 +1,2775 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportCustomersParams {
+
+  private final ExportType exportType;
+
+  private final BusinessEntityIdParams businessEntityId;
+
+  private final CustomerParams customer;
+
+  private final RelationshipParams relationship;
+
+  private ExportCustomersParams(ExportCustomersBuilder builder) {
+
+    this.exportType = builder.exportType;
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.customer = builder.customer;
+
+    this.relationship = builder.relationship;
+  }
+
+  public ExportType getExportType() {
+    return exportType;
+  }
+
+  public BusinessEntityIdParams getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public RelationshipParams getRelationship() {
+    return relationship;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.exportType != null) {
+
+      formData.put("export_type", this.exportType);
+    }
+
+    if (this.businessEntityId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.businessEntityId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "business_entity_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.relationship != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.relationship.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "relationship[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportCustomersParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportCustomersBuilder builder() {
+    return new ExportCustomersBuilder();
+  }
+
+  public static final class ExportCustomersBuilder {
+
+    private ExportType exportType;
+
+    private BusinessEntityIdParams businessEntityId;
+
+    private CustomerParams customer;
+
+    private RelationshipParams relationship;
+
+    private ExportCustomersBuilder() {}
+
+    public ExportCustomersBuilder exportType(ExportType value) {
+      this.exportType = value;
+      return this;
+    }
+
+    public ExportCustomersBuilder businessEntityId(BusinessEntityIdParams value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public ExportCustomersBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public ExportCustomersBuilder relationship(RelationshipParams value) {
+      this.relationship = value;
+      return this;
+    }
+
+    public ExportCustomersParams build() {
+      return new ExportCustomersParams(this);
+    }
+  }
+
+  public enum ExportType {
+    DATA("data"),
+
+    IMPORT_FRIENDLY_DATA("import_friendly_data"),
+
+    /** An enum member indicating that ExportType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ExportType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ExportType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ExportType enumValue : ExportType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class BusinessEntityIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BusinessEntityIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BusinessEntityIdBuilder builder() {
+      return new BusinessEntityIdBuilder();
+    }
+
+    public static final class BusinessEntityIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private BusinessEntityIdBuilder() {}
+
+      public BusinessEntityIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public BusinessEntityIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public BusinessEntityIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public BusinessEntityIdParams build() {
+        return new BusinessEntityIdParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final IdParams id;
+
+    private final FirstNameParams firstName;
+
+    private final LastNameParams lastName;
+
+    private final EmailParams email;
+
+    private final CompanyParams company;
+
+    private final PhoneParams phone;
+
+    private final AutoCollectionParams autoCollection;
+
+    private final TaxabilityParams taxability;
+
+    private final CreatedAtParams createdAt;
+
+    private final UpdatedAtParams updatedAt;
+
+    private final OfflinePaymentMethodParams offlinePaymentMethod;
+
+    private final AutoCloseInvoicesParams autoCloseInvoices;
+
+    private final ChannelParams channel;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.taxability = builder.taxability;
+
+      this.createdAt = builder.createdAt;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.autoCloseInvoices = builder.autoCloseInvoices;
+
+      this.channel = builder.channel;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public FirstNameParams getFirstName() {
+      return firstName;
+    }
+
+    public LastNameParams getLastName() {
+      return lastName;
+    }
+
+    public EmailParams getEmail() {
+      return email;
+    }
+
+    public CompanyParams getCompany() {
+      return company;
+    }
+
+    public PhoneParams getPhone() {
+      return phone;
+    }
+
+    public AutoCollectionParams getAutoCollection() {
+      return autoCollection;
+    }
+
+    public TaxabilityParams getTaxability() {
+      return taxability;
+    }
+
+    public CreatedAtParams getCreatedAt() {
+      return createdAt;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public OfflinePaymentMethodParams getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public AutoCloseInvoicesParams getAutoCloseInvoices() {
+      return autoCloseInvoices;
+    }
+
+    public ChannelParams getChannel() {
+      return channel;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.firstName != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.firstName.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "first_name[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.lastName != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.lastName.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "last_name[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.email != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.email.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "email[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.company != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.company.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "company[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.phone != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.phone.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "phone[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.autoCollection != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.autoCollection.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "auto_collection[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.taxability != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.taxability.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "taxability[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.createdAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.createdAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "created_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.offlinePaymentMethod.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "offline_payment_method[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.autoCloseInvoices != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.autoCloseInvoices.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "auto_close_invoices[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private IdParams id;
+
+      private FirstNameParams firstName;
+
+      private LastNameParams lastName;
+
+      private EmailParams email;
+
+      private CompanyParams company;
+
+      private PhoneParams phone;
+
+      private AutoCollectionParams autoCollection;
+
+      private TaxabilityParams taxability;
+
+      private CreatedAtParams createdAt;
+
+      private UpdatedAtParams updatedAt;
+
+      private OfflinePaymentMethodParams offlinePaymentMethod;
+
+      private AutoCloseInvoicesParams autoCloseInvoices;
+
+      private ChannelParams channel;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder firstName(FirstNameParams value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CustomerBuilder lastName(LastNameParams value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CustomerBuilder email(EmailParams value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerBuilder company(CompanyParams value) {
+        this.company = value;
+        return this;
+      }
+
+      public CustomerBuilder phone(PhoneParams value) {
+        this.phone = value;
+        return this;
+      }
+
+      public CustomerBuilder autoCollection(AutoCollectionParams value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public CustomerBuilder taxability(TaxabilityParams value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerBuilder createdAt(CreatedAtParams value) {
+        this.createdAt = value;
+        return this;
+      }
+
+      public CustomerBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public CustomerBuilder offlinePaymentMethod(OfflinePaymentMethodParams value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public CustomerBuilder autoCloseInvoices(AutoCloseInvoicesParams value) {
+        this.autoCloseInvoices = value;
+        return this;
+      }
+
+      public CustomerBuilder channel(ChannelParams value) {
+        this.channel = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class FirstNameParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private FirstNameParams(FirstNameBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for FirstNameParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static FirstNameBuilder builder() {
+      return new FirstNameBuilder();
+    }
+
+    public static final class FirstNameBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private FirstNameBuilder() {}
+
+      public FirstNameBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public FirstNameBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public FirstNameBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public FirstNameBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public FirstNameParams build() {
+        return new FirstNameParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class LastNameParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private LastNameParams(LastNameBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LastNameParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LastNameBuilder builder() {
+      return new LastNameBuilder();
+    }
+
+    public static final class LastNameBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private LastNameBuilder() {}
+
+      public LastNameBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public LastNameBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public LastNameBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public LastNameBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public LastNameParams build() {
+        return new LastNameParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class EmailParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private EmailParams(EmailBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EmailParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EmailBuilder builder() {
+      return new EmailBuilder();
+    }
+
+    public static final class EmailBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private EmailBuilder() {}
+
+      public EmailBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public EmailBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public EmailBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public EmailBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public EmailParams build() {
+        return new EmailParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CompanyParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private CompanyParams(CompanyBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CompanyParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CompanyBuilder builder() {
+      return new CompanyBuilder();
+    }
+
+    public static final class CompanyBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private CompanyBuilder() {}
+
+      public CompanyBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CompanyBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CompanyBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CompanyBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public CompanyParams build() {
+        return new CompanyParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PhoneParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private PhoneParams(PhoneBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PhoneParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PhoneBuilder builder() {
+      return new PhoneBuilder();
+    }
+
+    public static final class PhoneBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private PhoneBuilder() {}
+
+      public PhoneBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PhoneBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PhoneBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PhoneBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public PhoneParams build() {
+        return new PhoneParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AutoCollectionParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private AutoCollectionParams(AutoCollectionBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AutoCollectionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AutoCollectionBuilder builder() {
+      return new AutoCollectionBuilder();
+    }
+
+    public static final class AutoCollectionBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private AutoCollectionBuilder() {}
+
+      public AutoCollectionBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public AutoCollectionBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AutoCollectionBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public AutoCollectionBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public AutoCollectionParams build() {
+        return new AutoCollectionParams(this);
+      }
+    }
+
+    public enum Is {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxabilityParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private TaxabilityParams(TaxabilityBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxabilityParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxabilityBuilder builder() {
+      return new TaxabilityBuilder();
+    }
+
+    public static final class TaxabilityBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private TaxabilityBuilder() {}
+
+      public TaxabilityBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public TaxabilityBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TaxabilityBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public TaxabilityBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public TaxabilityParams build() {
+        return new TaxabilityParams(this);
+      }
+    }
+
+    public enum Is {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CreatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private CreatedAtParams(CreatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreatedAtBuilder builder() {
+      return new CreatedAtBuilder();
+    }
+
+    public static final class CreatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private CreatedAtBuilder() {}
+
+      public CreatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public CreatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public CreatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public CreatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public CreatedAtParams build() {
+        return new CreatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class OfflinePaymentMethodParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private OfflinePaymentMethodParams(OfflinePaymentMethodBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for OfflinePaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static OfflinePaymentMethodBuilder builder() {
+      return new OfflinePaymentMethodBuilder();
+    }
+
+    public static final class OfflinePaymentMethodBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private OfflinePaymentMethodBuilder() {}
+
+      public OfflinePaymentMethodBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodParams build() {
+        return new OfflinePaymentMethodParams(this);
+      }
+    }
+
+    public enum Is {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AutoCloseInvoicesParams {
+
+    private final Is is;
+
+    private AutoCloseInvoicesParams(AutoCloseInvoicesBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AutoCloseInvoicesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AutoCloseInvoicesBuilder builder() {
+      return new AutoCloseInvoicesBuilder();
+    }
+
+    public static final class AutoCloseInvoicesBuilder {
+
+      private Is is;
+
+      private AutoCloseInvoicesBuilder() {}
+
+      public AutoCloseInvoicesBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public AutoCloseInvoicesParams build() {
+        return new AutoCloseInvoicesParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChannelParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ChannelParams(ChannelBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChannelParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChannelBuilder builder() {
+      return new ChannelBuilder();
+    }
+
+    public static final class ChannelBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ChannelBuilder() {}
+
+      public ChannelBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ChannelBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ChannelBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ChannelBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ChannelParams build() {
+        return new ChannelParams(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class RelationshipParams {
+
+    private final ParentIdParams parentId;
+
+    private final PaymentOwnerIdParams paymentOwnerId;
+
+    private final InvoiceOwnerIdParams invoiceOwnerId;
+
+    private RelationshipParams(RelationshipBuilder builder) {
+
+      this.parentId = builder.parentId;
+
+      this.paymentOwnerId = builder.paymentOwnerId;
+
+      this.invoiceOwnerId = builder.invoiceOwnerId;
+    }
+
+    public ParentIdParams getParentId() {
+      return parentId;
+    }
+
+    public PaymentOwnerIdParams getPaymentOwnerId() {
+      return paymentOwnerId;
+    }
+
+    public InvoiceOwnerIdParams getInvoiceOwnerId() {
+      return invoiceOwnerId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.parentId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.parentId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "parent_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.paymentOwnerId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.paymentOwnerId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "payment_owner_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.invoiceOwnerId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.invoiceOwnerId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "invoice_owner_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for RelationshipParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static RelationshipBuilder builder() {
+      return new RelationshipBuilder();
+    }
+
+    public static final class RelationshipBuilder {
+
+      private ParentIdParams parentId;
+
+      private PaymentOwnerIdParams paymentOwnerId;
+
+      private InvoiceOwnerIdParams invoiceOwnerId;
+
+      private RelationshipBuilder() {}
+
+      public RelationshipBuilder parentId(ParentIdParams value) {
+        this.parentId = value;
+        return this;
+      }
+
+      public RelationshipBuilder paymentOwnerId(PaymentOwnerIdParams value) {
+        this.paymentOwnerId = value;
+        return this;
+      }
+
+      public RelationshipBuilder invoiceOwnerId(InvoiceOwnerIdParams value) {
+        this.invoiceOwnerId = value;
+        return this;
+      }
+
+      public RelationshipParams build() {
+        return new RelationshipParams(this);
+      }
+    }
+  }
+
+  public static final class ParentIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private ParentIdParams(ParentIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ParentIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ParentIdBuilder builder() {
+      return new ParentIdBuilder();
+    }
+
+    public static final class ParentIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private ParentIdBuilder() {}
+
+      public ParentIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ParentIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ParentIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ParentIdParams build() {
+        return new ParentIdParams(this);
+      }
+    }
+  }
+
+  public static final class PaymentOwnerIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private PaymentOwnerIdParams(PaymentOwnerIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentOwnerIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentOwnerIdBuilder builder() {
+      return new PaymentOwnerIdBuilder();
+    }
+
+    public static final class PaymentOwnerIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private PaymentOwnerIdBuilder() {}
+
+      public PaymentOwnerIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PaymentOwnerIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PaymentOwnerIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PaymentOwnerIdParams build() {
+        return new PaymentOwnerIdParams(this);
+      }
+    }
+  }
+
+  public static final class InvoiceOwnerIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private InvoiceOwnerIdParams(InvoiceOwnerIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceOwnerIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceOwnerIdBuilder builder() {
+      return new InvoiceOwnerIdBuilder();
+    }
+
+    public static final class InvoiceOwnerIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private InvoiceOwnerIdBuilder() {}
+
+      public InvoiceOwnerIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public InvoiceOwnerIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public InvoiceOwnerIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public InvoiceOwnerIdParams build() {
+        return new InvoiceOwnerIdParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportDeferredRevenueParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportDeferredRevenueParams.java
new file mode 100644
index 00000000..b167be82
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportDeferredRevenueParams.java
@@ -0,0 +1,8574 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportDeferredRevenueParams {
+
+  private final ReportBy reportBy;
+
+  private final String currencyCode;
+
+  private final Integer reportFromMonth;
+
+  private final Integer reportFromYear;
+
+  private final Integer reportToMonth;
+
+  private final Integer reportToYear;
+
+  private final Boolean includeDiscounts;
+
+  private final PaymentOwnerParams paymentOwner;
+
+  private final ItemIdParams itemId;
+
+  private final ItemPriceIdParams itemPriceId;
+
+  private final CancelReasonCodeParams cancelReasonCode;
+
+  private final BusinessEntityIdParams businessEntityId;
+
+  private final InvoiceParams invoice;
+
+  private final SubscriptionParams subscription;
+
+  private final CustomerParams customer;
+
+  private final RelationshipParams relationship;
+
+  private ExportDeferredRevenueParams(ExportDeferredRevenueBuilder builder) {
+
+    this.reportBy = builder.reportBy;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.reportFromMonth = builder.reportFromMonth;
+
+    this.reportFromYear = builder.reportFromYear;
+
+    this.reportToMonth = builder.reportToMonth;
+
+    this.reportToYear = builder.reportToYear;
+
+    this.includeDiscounts = builder.includeDiscounts;
+
+    this.paymentOwner = builder.paymentOwner;
+
+    this.itemId = builder.itemId;
+
+    this.itemPriceId = builder.itemPriceId;
+
+    this.cancelReasonCode = builder.cancelReasonCode;
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.invoice = builder.invoice;
+
+    this.subscription = builder.subscription;
+
+    this.customer = builder.customer;
+
+    this.relationship = builder.relationship;
+  }
+
+  public ReportBy getReportBy() {
+    return reportBy;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public Integer getReportFromMonth() {
+    return reportFromMonth;
+  }
+
+  public Integer getReportFromYear() {
+    return reportFromYear;
+  }
+
+  public Integer getReportToMonth() {
+    return reportToMonth;
+  }
+
+  public Integer getReportToYear() {
+    return reportToYear;
+  }
+
+  public Boolean getIncludeDiscounts() {
+    return includeDiscounts;
+  }
+
+  public PaymentOwnerParams getPaymentOwner() {
+    return paymentOwner;
+  }
+
+  public ItemIdParams getItemId() {
+    return itemId;
+  }
+
+  public ItemPriceIdParams getItemPriceId() {
+    return itemPriceId;
+  }
+
+  public CancelReasonCodeParams getCancelReasonCode() {
+    return cancelReasonCode;
+  }
+
+  public BusinessEntityIdParams getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public InvoiceParams getInvoice() {
+    return invoice;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public RelationshipParams getRelationship() {
+    return relationship;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.reportBy != null) {
+
+      formData.put("report_by", this.reportBy);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.reportFromMonth != null) {
+
+      formData.put("report_from_month", this.reportFromMonth);
+    }
+
+    if (this.reportFromYear != null) {
+
+      formData.put("report_from_year", this.reportFromYear);
+    }
+
+    if (this.reportToMonth != null) {
+
+      formData.put("report_to_month", this.reportToMonth);
+    }
+
+    if (this.reportToYear != null) {
+
+      formData.put("report_to_year", this.reportToYear);
+    }
+
+    if (this.includeDiscounts != null) {
+
+      formData.put("include_discounts", this.includeDiscounts);
+    }
+
+    if (this.paymentOwner != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentOwner.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_owner[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemPriceId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemPriceId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_price_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.cancelReasonCode != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.cancelReasonCode.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "cancel_reason_code[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.businessEntityId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.businessEntityId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "business_entity_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.invoice != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.invoice.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "invoice[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.relationship != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.relationship.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "relationship[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportDeferredRevenueParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportDeferredRevenueBuilder builder() {
+    return new ExportDeferredRevenueBuilder();
+  }
+
+  public static final class ExportDeferredRevenueBuilder {
+
+    private ReportBy reportBy;
+
+    private String currencyCode;
+
+    private Integer reportFromMonth;
+
+    private Integer reportFromYear;
+
+    private Integer reportToMonth;
+
+    private Integer reportToYear;
+
+    private Boolean includeDiscounts;
+
+    private PaymentOwnerParams paymentOwner;
+
+    private ItemIdParams itemId;
+
+    private ItemPriceIdParams itemPriceId;
+
+    private CancelReasonCodeParams cancelReasonCode;
+
+    private BusinessEntityIdParams businessEntityId;
+
+    private InvoiceParams invoice;
+
+    private SubscriptionParams subscription;
+
+    private CustomerParams customer;
+
+    private RelationshipParams relationship;
+
+    private ExportDeferredRevenueBuilder() {}
+
+    public ExportDeferredRevenueBuilder reportBy(ReportBy value) {
+      this.reportBy = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder reportFromMonth(Integer value) {
+      this.reportFromMonth = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder reportFromYear(Integer value) {
+      this.reportFromYear = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder reportToMonth(Integer value) {
+      this.reportToMonth = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder reportToYear(Integer value) {
+      this.reportToYear = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder includeDiscounts(Boolean value) {
+      this.includeDiscounts = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder paymentOwner(PaymentOwnerParams value) {
+      this.paymentOwner = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder itemId(ItemIdParams value) {
+      this.itemId = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder itemPriceId(ItemPriceIdParams value) {
+      this.itemPriceId = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder cancelReasonCode(CancelReasonCodeParams value) {
+      this.cancelReasonCode = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder businessEntityId(BusinessEntityIdParams value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder invoice(InvoiceParams value) {
+      this.invoice = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueBuilder relationship(RelationshipParams value) {
+      this.relationship = value;
+      return this;
+    }
+
+    public ExportDeferredRevenueParams build() {
+      return new ExportDeferredRevenueParams(this);
+    }
+  }
+
+  public enum ReportBy {
+    CUSTOMER("customer"),
+
+    INVOICE("invoice"),
+
+    PRODUCT("product"),
+
+    SUBSCRIPTION("subscription"),
+
+    /** An enum member indicating that ReportBy was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ReportBy(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ReportBy fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ReportBy enumValue : ReportBy.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class PaymentOwnerParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PaymentOwnerParams(PaymentOwnerBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentOwnerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentOwnerBuilder builder() {
+      return new PaymentOwnerBuilder();
+    }
+
+    public static final class PaymentOwnerBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private PaymentOwnerBuilder() {}
+
+      public PaymentOwnerBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PaymentOwnerBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PaymentOwnerBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PaymentOwnerBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PaymentOwnerBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PaymentOwnerParams build() {
+        return new PaymentOwnerParams(this);
+      }
+    }
+  }
+
+  public static final class ItemIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemIdParams(ItemIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemIdBuilder builder() {
+      return new ItemIdBuilder();
+    }
+
+    public static final class ItemIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemIdBuilder() {}
+
+      public ItemIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ItemIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemIdParams build() {
+        return new ItemIdParams(this);
+      }
+    }
+  }
+
+  public static final class ItemPriceIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemPriceIdParams(ItemPriceIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemPriceIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemPriceIdBuilder builder() {
+      return new ItemPriceIdBuilder();
+    }
+
+    public static final class ItemPriceIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemPriceIdBuilder() {}
+
+      public ItemPriceIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemPriceIdParams build() {
+        return new ItemPriceIdParams(this);
+      }
+    }
+  }
+
+  public static final class CancelReasonCodeParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CancelReasonCodeParams(CancelReasonCodeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CancelReasonCodeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CancelReasonCodeBuilder builder() {
+      return new CancelReasonCodeBuilder();
+    }
+
+    public static final class CancelReasonCodeBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CancelReasonCodeBuilder() {}
+
+      public CancelReasonCodeBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CancelReasonCodeBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CancelReasonCodeBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CancelReasonCodeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CancelReasonCodeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CancelReasonCodeParams build() {
+        return new CancelReasonCodeParams(this);
+      }
+    }
+  }
+
+  public static final class BusinessEntityIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BusinessEntityIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BusinessEntityIdBuilder builder() {
+      return new BusinessEntityIdBuilder();
+    }
+
+    public static final class BusinessEntityIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private BusinessEntityIdBuilder() {}
+
+      public BusinessEntityIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public BusinessEntityIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public BusinessEntityIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public BusinessEntityIdParams build() {
+        return new BusinessEntityIdParams(this);
+      }
+    }
+  }
+
+  public static final class InvoiceParams {
+
+    private final IdParams id;
+
+    private final RecurringParams recurring;
+
+    private final StatusParams status;
+
+    private final PriceTypeParams priceType;
+
+    private final DateParams date;
+
+    private final PaidAtParams paidAt;
+
+    private final TotalParams total;
+
+    private final AmountPaidParams amountPaid;
+
+    private final AmountAdjustedParams amountAdjusted;
+
+    private final CreditsAppliedParams creditsApplied;
+
+    private final AmountDueParams amountDue;
+
+    private final DunningStatusParams dunningStatus;
+
+    private final UpdatedAtParams updatedAt;
+
+    private final ChannelParams channel;
+
+    private InvoiceParams(InvoiceBuilder builder) {
+
+      this.id = builder.id;
+
+      this.recurring = builder.recurring;
+
+      this.status = builder.status;
+
+      this.priceType = builder.priceType;
+
+      this.date = builder.date;
+
+      this.paidAt = builder.paidAt;
+
+      this.total = builder.total;
+
+      this.amountPaid = builder.amountPaid;
+
+      this.amountAdjusted = builder.amountAdjusted;
+
+      this.creditsApplied = builder.creditsApplied;
+
+      this.amountDue = builder.amountDue;
+
+      this.dunningStatus = builder.dunningStatus;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.channel = builder.channel;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public RecurringParams getRecurring() {
+      return recurring;
+    }
+
+    public StatusParams getStatus() {
+      return status;
+    }
+
+    public PriceTypeParams getPriceType() {
+      return priceType;
+    }
+
+    public DateParams getDate() {
+      return date;
+    }
+
+    public PaidAtParams getPaidAt() {
+      return paidAt;
+    }
+
+    public TotalParams getTotal() {
+      return total;
+    }
+
+    public AmountPaidParams getAmountPaid() {
+      return amountPaid;
+    }
+
+    public AmountAdjustedParams getAmountAdjusted() {
+      return amountAdjusted;
+    }
+
+    public CreditsAppliedParams getCreditsApplied() {
+      return creditsApplied;
+    }
+
+    public AmountDueParams getAmountDue() {
+      return amountDue;
+    }
+
+    public DunningStatusParams getDunningStatus() {
+      return dunningStatus;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public ChannelParams getChannel() {
+      return channel;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.recurring != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.recurring.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "recurring[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.priceType != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.priceType.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "price_type[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.date != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.date.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "date[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.paidAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.paidAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "paid_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.total != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.total.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "total[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountPaid != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountPaid.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_paid[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountAdjusted != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountAdjusted.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_adjusted[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.creditsApplied != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.creditsApplied.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "credits_applied[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountDue != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountDue.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_due[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.dunningStatus != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.dunningStatus.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "dunning_status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceBuilder builder() {
+      return new InvoiceBuilder();
+    }
+
+    public static final class InvoiceBuilder {
+
+      private IdParams id;
+
+      private RecurringParams recurring;
+
+      private StatusParams status;
+
+      private PriceTypeParams priceType;
+
+      private DateParams date;
+
+      private PaidAtParams paidAt;
+
+      private TotalParams total;
+
+      private AmountPaidParams amountPaid;
+
+      private AmountAdjustedParams amountAdjusted;
+
+      private CreditsAppliedParams creditsApplied;
+
+      private AmountDueParams amountDue;
+
+      private DunningStatusParams dunningStatus;
+
+      private UpdatedAtParams updatedAt;
+
+      private ChannelParams channel;
+
+      private InvoiceBuilder() {}
+
+      public InvoiceBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public InvoiceBuilder recurring(RecurringParams value) {
+        this.recurring = value;
+        return this;
+      }
+
+      public InvoiceBuilder status(StatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public InvoiceBuilder priceType(PriceTypeParams value) {
+        this.priceType = value;
+        return this;
+      }
+
+      public InvoiceBuilder date(DateParams value) {
+        this.date = value;
+        return this;
+      }
+
+      public InvoiceBuilder paidAt(PaidAtParams value) {
+        this.paidAt = value;
+        return this;
+      }
+
+      public InvoiceBuilder total(TotalParams value) {
+        this.total = value;
+        return this;
+      }
+
+      public InvoiceBuilder amountPaid(AmountPaidParams value) {
+        this.amountPaid = value;
+        return this;
+      }
+
+      public InvoiceBuilder amountAdjusted(AmountAdjustedParams value) {
+        this.amountAdjusted = value;
+        return this;
+      }
+
+      public InvoiceBuilder creditsApplied(CreditsAppliedParams value) {
+        this.creditsApplied = value;
+        return this;
+      }
+
+      public InvoiceBuilder amountDue(AmountDueParams value) {
+        this.amountDue = value;
+        return this;
+      }
+
+      public InvoiceBuilder dunningStatus(DunningStatusParams value) {
+        this.dunningStatus = value;
+        return this;
+      }
+
+      public InvoiceBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public InvoiceBuilder channel(ChannelParams value) {
+        this.channel = value;
+        return this;
+      }
+
+      public InvoiceParams build() {
+        return new InvoiceParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class RecurringParams {
+
+    private final Is is;
+
+    private RecurringParams(RecurringBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for RecurringParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static RecurringBuilder builder() {
+      return new RecurringBuilder();
+    }
+
+    public static final class RecurringBuilder {
+
+      private Is is;
+
+      private RecurringBuilder() {}
+
+      public RecurringBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public RecurringParams build() {
+        return new RecurringParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private StatusParams(StatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatusBuilder builder() {
+      return new StatusBuilder();
+    }
+
+    public static final class StatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private StatusBuilder() {}
+
+      public StatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public StatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public StatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public StatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public StatusParams build() {
+        return new StatusParams(this);
+      }
+    }
+
+    public enum Is {
+      PAID("paid"),
+
+      POSTED("posted"),
+
+      PAYMENT_DUE("payment_due"),
+
+      NOT_PAID("not_paid"),
+
+      VOIDED("voided"),
+
+      PENDING("pending"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      PAID("paid"),
+
+      POSTED("posted"),
+
+      PAYMENT_DUE("payment_due"),
+
+      NOT_PAID("not_paid"),
+
+      VOIDED("voided"),
+
+      PENDING("pending"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PriceTypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PriceTypeParams(PriceTypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PriceTypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PriceTypeBuilder builder() {
+      return new PriceTypeBuilder();
+    }
+
+    public static final class PriceTypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private PriceTypeBuilder() {}
+
+      public PriceTypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public PriceTypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PriceTypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PriceTypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PriceTypeParams build() {
+        return new PriceTypeParams(this);
+      }
+    }
+
+    public enum Is {
+      TAX_EXCLUSIVE("tax_exclusive"),
+
+      TAX_INCLUSIVE("tax_inclusive"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      TAX_EXCLUSIVE("tax_exclusive"),
+
+      TAX_INCLUSIVE("tax_inclusive"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DateParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private DateParams(DateBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DateParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DateBuilder builder() {
+      return new DateBuilder();
+    }
+
+    public static final class DateBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private DateBuilder() {}
+
+      public DateBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public DateBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public DateBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public DateBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public DateParams build() {
+        return new DateParams(this);
+      }
+    }
+  }
+
+  public static final class PaidAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private PaidAtParams(PaidAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaidAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaidAtBuilder builder() {
+      return new PaidAtBuilder();
+    }
+
+    public static final class PaidAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private PaidAtBuilder() {}
+
+      public PaidAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public PaidAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public PaidAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public PaidAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public PaidAtParams build() {
+        return new PaidAtParams(this);
+      }
+    }
+  }
+
+  public static final class TotalParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private TotalParams(TotalBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TotalParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TotalBuilder builder() {
+      return new TotalBuilder();
+    }
+
+    public static final class TotalBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private TotalBuilder() {}
+
+      public TotalBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public TotalBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TotalBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public TotalBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public TotalBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public TotalBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public TotalBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public TotalParams build() {
+        return new TotalParams(this);
+      }
+    }
+  }
+
+  public static final class AmountPaidParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountPaidParams(AmountPaidBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountPaidParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountPaidBuilder builder() {
+      return new AmountPaidBuilder();
+    }
+
+    public static final class AmountPaidBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountPaidBuilder() {}
+
+      public AmountPaidBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountPaidBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountPaidBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountPaidBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountPaidBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountPaidBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountPaidBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountPaidParams build() {
+        return new AmountPaidParams(this);
+      }
+    }
+  }
+
+  public static final class AmountAdjustedParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountAdjustedParams(AmountAdjustedBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountAdjustedParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountAdjustedBuilder builder() {
+      return new AmountAdjustedBuilder();
+    }
+
+    public static final class AmountAdjustedBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountAdjustedBuilder() {}
+
+      public AmountAdjustedBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountAdjustedParams build() {
+        return new AmountAdjustedParams(this);
+      }
+    }
+  }
+
+  public static final class CreditsAppliedParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private CreditsAppliedParams(CreditsAppliedBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreditsAppliedParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreditsAppliedBuilder builder() {
+      return new CreditsAppliedBuilder();
+    }
+
+    public static final class CreditsAppliedBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private CreditsAppliedBuilder() {}
+
+      public CreditsAppliedBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public CreditsAppliedParams build() {
+        return new CreditsAppliedParams(this);
+      }
+    }
+  }
+
+  public static final class AmountDueParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountDueParams(AmountDueBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountDueParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountDueBuilder builder() {
+      return new AmountDueBuilder();
+    }
+
+    public static final class AmountDueBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountDueBuilder() {}
+
+      public AmountDueBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountDueBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountDueBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountDueBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountDueBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountDueBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountDueBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountDueParams build() {
+        return new AmountDueParams(this);
+      }
+    }
+  }
+
+  public static final class DunningStatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private final IsPresent isPresent;
+
+    private DunningStatusParams(DunningStatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DunningStatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DunningStatusBuilder builder() {
+      return new DunningStatusBuilder();
+    }
+
+    public static final class DunningStatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private IsPresent isPresent;
+
+      private DunningStatusBuilder() {}
+
+      public DunningStatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public DunningStatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public DunningStatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public DunningStatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public DunningStatusBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public DunningStatusParams build() {
+        return new DunningStatusParams(this);
+      }
+    }
+
+    public enum Is {
+      IN_PROGRESS("in_progress"),
+
+      EXHAUSTED("exhausted"),
+
+      STOPPED("stopped"),
+
+      SUCCESS("success"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      IN_PROGRESS("in_progress"),
+
+      EXHAUSTED("exhausted"),
+
+      STOPPED("stopped"),
+
+      SUCCESS("success"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class ChannelParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ChannelParams(ChannelBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChannelParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChannelBuilder builder() {
+      return new ChannelBuilder();
+    }
+
+    public static final class ChannelBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ChannelBuilder() {}
+
+      public ChannelBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ChannelBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ChannelBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ChannelBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ChannelParams build() {
+        return new ChannelParams(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final ExportIdParams id;
+
+    private final CustomerIdParams customerId;
+
+    private final ExportStatusParams status;
+
+    private final CancelReasonParams cancelReason;
+
+    private final RemainingBillingCyclesParams remainingBillingCycles;
+
+    private final CreatedAtParams createdAt;
+
+    private final ActivatedAtParams activatedAt;
+
+    private final NextBillingAtParams nextBillingAt;
+
+    private final CancelledAtParams cancelledAt;
+
+    private final HasScheduledChangesParams hasScheduledChanges;
+
+    private final ExportUpdatedAtParams updatedAt;
+
+    private final OfflinePaymentMethodParams offlinePaymentMethod;
+
+    private final AutoCloseInvoicesParams autoCloseInvoices;
+
+    private final ExportChannelParams channel;
+
+    private final PlanIdParams planId;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.customerId = builder.customerId;
+
+      this.status = builder.status;
+
+      this.cancelReason = builder.cancelReason;
+
+      this.remainingBillingCycles = builder.remainingBillingCycles;
+
+      this.createdAt = builder.createdAt;
+
+      this.activatedAt = builder.activatedAt;
+
+      this.nextBillingAt = builder.nextBillingAt;
+
+      this.cancelledAt = builder.cancelledAt;
+
+      this.hasScheduledChanges = builder.hasScheduledChanges;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.autoCloseInvoices = builder.autoCloseInvoices;
+
+      this.channel = builder.channel;
+
+      this.planId = builder.planId;
+    }
+
+    public ExportIdParams getId() {
+      return id;
+    }
+
+    public CustomerIdParams getCustomerId() {
+      return customerId;
+    }
+
+    public ExportStatusParams getStatus() {
+      return status;
+    }
+
+    public CancelReasonParams getCancelReason() {
+      return cancelReason;
+    }
+
+    public RemainingBillingCyclesParams getRemainingBillingCycles() {
+      return remainingBillingCycles;
+    }
+
+    public CreatedAtParams getCreatedAt() {
+      return createdAt;
+    }
+
+    public ActivatedAtParams getActivatedAt() {
+      return activatedAt;
+    }
+
+    public NextBillingAtParams getNextBillingAt() {
+      return nextBillingAt;
+    }
+
+    public CancelledAtParams getCancelledAt() {
+      return cancelledAt;
+    }
+
+    public HasScheduledChangesParams getHasScheduledChanges() {
+      return hasScheduledChanges;
+    }
+
+    public ExportUpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public OfflinePaymentMethodParams getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public AutoCloseInvoicesParams getAutoCloseInvoices() {
+      return autoCloseInvoices;
+    }
+
+    public ExportChannelParams getChannel() {
+      return channel;
+    }
+
+    public PlanIdParams getPlanId() {
+      return planId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.customerId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.customerId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "customer_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.cancelReason != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.cancelReason.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "cancel_reason[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.remainingBillingCycles != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.remainingBillingCycles.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "remaining_billing_cycles[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.createdAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.createdAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "created_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.activatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.activatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "activated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.nextBillingAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.nextBillingAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "next_billing_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.cancelledAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.cancelledAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "cancelled_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.hasScheduledChanges != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.hasScheduledChanges.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "has_scheduled_changes[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.offlinePaymentMethod.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "offline_payment_method[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.autoCloseInvoices != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.autoCloseInvoices.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "auto_close_invoices[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.planId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.planId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "plan_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private ExportIdParams id;
+
+      private CustomerIdParams customerId;
+
+      private ExportStatusParams status;
+
+      private CancelReasonParams cancelReason;
+
+      private RemainingBillingCyclesParams remainingBillingCycles;
+
+      private CreatedAtParams createdAt;
+
+      private ActivatedAtParams activatedAt;
+
+      private NextBillingAtParams nextBillingAt;
+
+      private CancelledAtParams cancelledAt;
+
+      private HasScheduledChangesParams hasScheduledChanges;
+
+      private ExportUpdatedAtParams updatedAt;
+
+      private OfflinePaymentMethodParams offlinePaymentMethod;
+
+      private AutoCloseInvoicesParams autoCloseInvoices;
+
+      private ExportChannelParams channel;
+
+      private PlanIdParams planId;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(ExportIdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder customerId(CustomerIdParams value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder status(ExportStatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public SubscriptionBuilder cancelReason(CancelReasonParams value) {
+        this.cancelReason = value;
+        return this;
+      }
+
+      public SubscriptionBuilder remainingBillingCycles(RemainingBillingCyclesParams value) {
+        this.remainingBillingCycles = value;
+        return this;
+      }
+
+      public SubscriptionBuilder createdAt(CreatedAtParams value) {
+        this.createdAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder activatedAt(ActivatedAtParams value) {
+        this.activatedAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder nextBillingAt(NextBillingAtParams value) {
+        this.nextBillingAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder cancelledAt(CancelledAtParams value) {
+        this.cancelledAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder hasScheduledChanges(HasScheduledChangesParams value) {
+        this.hasScheduledChanges = value;
+        return this;
+      }
+
+      public SubscriptionBuilder updatedAt(ExportUpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethodParams value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCloseInvoices(AutoCloseInvoicesParams value) {
+        this.autoCloseInvoices = value;
+        return this;
+      }
+
+      public SubscriptionBuilder channel(ExportChannelParams value) {
+        this.channel = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planId(PlanIdParams value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+  }
+
+  public static final class ExportIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ExportIdParams(ExportIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportIdBuilder builder() {
+      return new ExportIdBuilder();
+    }
+
+    public static final class ExportIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ExportIdBuilder() {}
+
+      public ExportIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ExportIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ExportIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ExportIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ExportIdParams build() {
+        return new ExportIdParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CustomerIdParams(CustomerIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerIdBuilder builder() {
+      return new CustomerIdBuilder();
+    }
+
+    public static final class CustomerIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CustomerIdBuilder() {}
+
+      public CustomerIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CustomerIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CustomerIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CustomerIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CustomerIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CustomerIdParams build() {
+        return new CustomerIdParams(this);
+      }
+    }
+  }
+
+  public static final class ExportStatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ExportStatusParams(ExportStatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportStatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportStatusBuilder builder() {
+      return new ExportStatusBuilder();
+    }
+
+    public static final class ExportStatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ExportStatusBuilder() {}
+
+      public ExportStatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportStatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ExportStatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ExportStatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ExportStatusParams build() {
+        return new ExportStatusParams(this);
+      }
+    }
+
+    public enum Is {
+      FUTURE("future"),
+
+      IN_TRIAL("in_trial"),
+
+      ACTIVE("active"),
+
+      NON_RENEWING("non_renewing"),
+
+      PAUSED("paused"),
+
+      CANCELLED("cancelled"),
+
+      TRANSFERRED("transferred"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      FUTURE("future"),
+
+      IN_TRIAL("in_trial"),
+
+      ACTIVE("active"),
+
+      NON_RENEWING("non_renewing"),
+
+      PAUSED("paused"),
+
+      CANCELLED("cancelled"),
+
+      TRANSFERRED("transferred"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CancelReasonParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private final IsPresent isPresent;
+
+    private CancelReasonParams(CancelReasonBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CancelReasonParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CancelReasonBuilder builder() {
+      return new CancelReasonBuilder();
+    }
+
+    public static final class CancelReasonBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private IsPresent isPresent;
+
+      private CancelReasonBuilder() {}
+
+      public CancelReasonBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public CancelReasonBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CancelReasonBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CancelReasonBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CancelReasonBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public CancelReasonParams build() {
+        return new CancelReasonParams(this);
+      }
+    }
+
+    public enum Is {
+      NOT_PAID("not_paid"),
+
+      NO_CARD("no_card"),
+
+      FRAUD_REVIEW_FAILED("fraud_review_failed"),
+
+      NON_COMPLIANT_EU_CUSTOMER("non_compliant_eu_customer"),
+
+      TAX_CALCULATION_FAILED("tax_calculation_failed"),
+
+      CURRENCY_INCOMPATIBLE_WITH_GATEWAY("currency_incompatible_with_gateway"),
+
+      NON_COMPLIANT_CUSTOMER("non_compliant_customer"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      NOT_PAID("not_paid"),
+
+      NO_CARD("no_card"),
+
+      FRAUD_REVIEW_FAILED("fraud_review_failed"),
+
+      NON_COMPLIANT_EU_CUSTOMER("non_compliant_eu_customer"),
+
+      TAX_CALCULATION_FAILED("tax_calculation_failed"),
+
+      CURRENCY_INCOMPATIBLE_WITH_GATEWAY("currency_incompatible_with_gateway"),
+
+      NON_COMPLIANT_CUSTOMER("non_compliant_customer"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class RemainingBillingCyclesParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private final IsPresent isPresent;
+
+    private RemainingBillingCyclesParams(RemainingBillingCyclesBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for RemainingBillingCyclesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static RemainingBillingCyclesBuilder builder() {
+      return new RemainingBillingCyclesBuilder();
+    }
+
+    public static final class RemainingBillingCyclesBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private IsPresent isPresent;
+
+      private RemainingBillingCyclesBuilder() {}
+
+      public RemainingBillingCyclesBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesParams build() {
+        return new RemainingBillingCyclesParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CreatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private CreatedAtParams(CreatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreatedAtBuilder builder() {
+      return new CreatedAtBuilder();
+    }
+
+    public static final class CreatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private CreatedAtBuilder() {}
+
+      public CreatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public CreatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public CreatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public CreatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public CreatedAtParams build() {
+        return new CreatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class ActivatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private final IsPresent isPresent;
+
+    private ActivatedAtParams(ActivatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ActivatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ActivatedAtBuilder builder() {
+      return new ActivatedAtBuilder();
+    }
+
+    public static final class ActivatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private IsPresent isPresent;
+
+      private ActivatedAtBuilder() {}
+
+      public ActivatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public ActivatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public ActivatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public ActivatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public ActivatedAtBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public ActivatedAtParams build() {
+        return new ActivatedAtParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class NextBillingAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private NextBillingAtParams(NextBillingAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NextBillingAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NextBillingAtBuilder builder() {
+      return new NextBillingAtBuilder();
+    }
+
+    public static final class NextBillingAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private NextBillingAtBuilder() {}
+
+      public NextBillingAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public NextBillingAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public NextBillingAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public NextBillingAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public NextBillingAtParams build() {
+        return new NextBillingAtParams(this);
+      }
+    }
+  }
+
+  public static final class CancelledAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private CancelledAtParams(CancelledAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CancelledAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CancelledAtBuilder builder() {
+      return new CancelledAtBuilder();
+    }
+
+    public static final class CancelledAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private CancelledAtBuilder() {}
+
+      public CancelledAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public CancelledAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public CancelledAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public CancelledAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public CancelledAtParams build() {
+        return new CancelledAtParams(this);
+      }
+    }
+  }
+
+  public static final class HasScheduledChangesParams {
+
+    private final Is is;
+
+    private HasScheduledChangesParams(HasScheduledChangesBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for HasScheduledChangesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static HasScheduledChangesBuilder builder() {
+      return new HasScheduledChangesBuilder();
+    }
+
+    public static final class HasScheduledChangesBuilder {
+
+      private Is is;
+
+      private HasScheduledChangesBuilder() {}
+
+      public HasScheduledChangesBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public HasScheduledChangesParams build() {
+        return new HasScheduledChangesParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ExportUpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private ExportUpdatedAtParams(ExportUpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportUpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportUpdatedAtBuilder builder() {
+      return new ExportUpdatedAtBuilder();
+    }
+
+    public static final class ExportUpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private ExportUpdatedAtBuilder() {}
+
+      public ExportUpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public ExportUpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public ExportUpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public ExportUpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public ExportUpdatedAtParams build() {
+        return new ExportUpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class OfflinePaymentMethodParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private OfflinePaymentMethodParams(OfflinePaymentMethodBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for OfflinePaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static OfflinePaymentMethodBuilder builder() {
+      return new OfflinePaymentMethodBuilder();
+    }
+
+    public static final class OfflinePaymentMethodBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private OfflinePaymentMethodBuilder() {}
+
+      public OfflinePaymentMethodBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodParams build() {
+        return new OfflinePaymentMethodParams(this);
+      }
+    }
+
+    public enum Is {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AutoCloseInvoicesParams {
+
+    private final Is is;
+
+    private AutoCloseInvoicesParams(AutoCloseInvoicesBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AutoCloseInvoicesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AutoCloseInvoicesBuilder builder() {
+      return new AutoCloseInvoicesBuilder();
+    }
+
+    public static final class AutoCloseInvoicesBuilder {
+
+      private Is is;
+
+      private AutoCloseInvoicesBuilder() {}
+
+      public AutoCloseInvoicesBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public AutoCloseInvoicesParams build() {
+        return new AutoCloseInvoicesParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ExportChannelParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ExportChannelParams(ExportChannelBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportChannelParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportChannelBuilder builder() {
+      return new ExportChannelBuilder();
+    }
+
+    public static final class ExportChannelBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ExportChannelBuilder() {}
+
+      public ExportChannelBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportChannelBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ExportChannelBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ExportChannelBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ExportChannelParams build() {
+        return new ExportChannelParams(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PlanIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PlanIdParams(PlanIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PlanIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PlanIdBuilder builder() {
+      return new PlanIdBuilder();
+    }
+
+    public static final class PlanIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private PlanIdBuilder() {}
+
+      public PlanIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PlanIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PlanIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PlanIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PlanIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PlanIdParams build() {
+        return new PlanIdParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final ExportId2Params id;
+
+    private final FirstNameParams firstName;
+
+    private final LastNameParams lastName;
+
+    private final EmailParams email;
+
+    private final CompanyParams company;
+
+    private final PhoneParams phone;
+
+    private final AutoCollectionParams autoCollection;
+
+    private final TaxabilityParams taxability;
+
+    private final ExportCreatedAtParams createdAt;
+
+    private final ExportUpdatedAt2Params updatedAt;
+
+    private final ExportOfflinePaymentMethodParams offlinePaymentMethod;
+
+    private final ExportAutoCloseInvoicesParams autoCloseInvoices;
+
+    private final ExportChannel2Params channel;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.taxability = builder.taxability;
+
+      this.createdAt = builder.createdAt;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.autoCloseInvoices = builder.autoCloseInvoices;
+
+      this.channel = builder.channel;
+    }
+
+    public ExportId2Params getId() {
+      return id;
+    }
+
+    public FirstNameParams getFirstName() {
+      return firstName;
+    }
+
+    public LastNameParams getLastName() {
+      return lastName;
+    }
+
+    public EmailParams getEmail() {
+      return email;
+    }
+
+    public CompanyParams getCompany() {
+      return company;
+    }
+
+    public PhoneParams getPhone() {
+      return phone;
+    }
+
+    public AutoCollectionParams getAutoCollection() {
+      return autoCollection;
+    }
+
+    public TaxabilityParams getTaxability() {
+      return taxability;
+    }
+
+    public ExportCreatedAtParams getCreatedAt() {
+      return createdAt;
+    }
+
+    public ExportUpdatedAt2Params getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public ExportOfflinePaymentMethodParams getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public ExportAutoCloseInvoicesParams getAutoCloseInvoices() {
+      return autoCloseInvoices;
+    }
+
+    public ExportChannel2Params getChannel() {
+      return channel;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.firstName != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.firstName.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "first_name[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.lastName != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.lastName.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "last_name[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.email != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.email.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "email[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.company != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.company.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "company[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.phone != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.phone.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "phone[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.autoCollection != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.autoCollection.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "auto_collection[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.taxability != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.taxability.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "taxability[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.createdAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.createdAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "created_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.offlinePaymentMethod.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "offline_payment_method[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.autoCloseInvoices != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.autoCloseInvoices.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "auto_close_invoices[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private ExportId2Params id;
+
+      private FirstNameParams firstName;
+
+      private LastNameParams lastName;
+
+      private EmailParams email;
+
+      private CompanyParams company;
+
+      private PhoneParams phone;
+
+      private AutoCollectionParams autoCollection;
+
+      private TaxabilityParams taxability;
+
+      private ExportCreatedAtParams createdAt;
+
+      private ExportUpdatedAt2Params updatedAt;
+
+      private ExportOfflinePaymentMethodParams offlinePaymentMethod;
+
+      private ExportAutoCloseInvoicesParams autoCloseInvoices;
+
+      private ExportChannel2Params channel;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(ExportId2Params value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder firstName(FirstNameParams value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CustomerBuilder lastName(LastNameParams value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CustomerBuilder email(EmailParams value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerBuilder company(CompanyParams value) {
+        this.company = value;
+        return this;
+      }
+
+      public CustomerBuilder phone(PhoneParams value) {
+        this.phone = value;
+        return this;
+      }
+
+      public CustomerBuilder autoCollection(AutoCollectionParams value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public CustomerBuilder taxability(TaxabilityParams value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerBuilder createdAt(ExportCreatedAtParams value) {
+        this.createdAt = value;
+        return this;
+      }
+
+      public CustomerBuilder updatedAt(ExportUpdatedAt2Params value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public CustomerBuilder offlinePaymentMethod(ExportOfflinePaymentMethodParams value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public CustomerBuilder autoCloseInvoices(ExportAutoCloseInvoicesParams value) {
+        this.autoCloseInvoices = value;
+        return this;
+      }
+
+      public CustomerBuilder channel(ExportChannel2Params value) {
+        this.channel = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class ExportId2Params {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ExportId2Params(ExportId2Builder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportId2Params. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportId2Builder builder() {
+      return new ExportId2Builder();
+    }
+
+    public static final class ExportId2Builder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ExportId2Builder() {}
+
+      public ExportId2Builder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportId2Builder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ExportId2Builder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ExportId2Builder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ExportId2Builder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ExportId2Params build() {
+        return new ExportId2Params(this);
+      }
+    }
+  }
+
+  public static final class FirstNameParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private FirstNameParams(FirstNameBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for FirstNameParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static FirstNameBuilder builder() {
+      return new FirstNameBuilder();
+    }
+
+    public static final class FirstNameBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private FirstNameBuilder() {}
+
+      public FirstNameBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public FirstNameBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public FirstNameBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public FirstNameBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public FirstNameParams build() {
+        return new FirstNameParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class LastNameParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private LastNameParams(LastNameBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LastNameParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LastNameBuilder builder() {
+      return new LastNameBuilder();
+    }
+
+    public static final class LastNameBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private LastNameBuilder() {}
+
+      public LastNameBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public LastNameBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public LastNameBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public LastNameBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public LastNameParams build() {
+        return new LastNameParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class EmailParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private EmailParams(EmailBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EmailParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EmailBuilder builder() {
+      return new EmailBuilder();
+    }
+
+    public static final class EmailBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private EmailBuilder() {}
+
+      public EmailBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public EmailBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public EmailBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public EmailBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public EmailParams build() {
+        return new EmailParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CompanyParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private CompanyParams(CompanyBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CompanyParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CompanyBuilder builder() {
+      return new CompanyBuilder();
+    }
+
+    public static final class CompanyBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private CompanyBuilder() {}
+
+      public CompanyBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CompanyBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CompanyBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CompanyBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public CompanyParams build() {
+        return new CompanyParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PhoneParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private PhoneParams(PhoneBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PhoneParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PhoneBuilder builder() {
+      return new PhoneBuilder();
+    }
+
+    public static final class PhoneBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private PhoneBuilder() {}
+
+      public PhoneBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PhoneBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PhoneBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PhoneBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public PhoneParams build() {
+        return new PhoneParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AutoCollectionParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private AutoCollectionParams(AutoCollectionBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AutoCollectionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AutoCollectionBuilder builder() {
+      return new AutoCollectionBuilder();
+    }
+
+    public static final class AutoCollectionBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private AutoCollectionBuilder() {}
+
+      public AutoCollectionBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public AutoCollectionBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AutoCollectionBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public AutoCollectionBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public AutoCollectionParams build() {
+        return new AutoCollectionParams(this);
+      }
+    }
+
+    public enum Is {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxabilityParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private TaxabilityParams(TaxabilityBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxabilityParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxabilityBuilder builder() {
+      return new TaxabilityBuilder();
+    }
+
+    public static final class TaxabilityBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private TaxabilityBuilder() {}
+
+      public TaxabilityBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public TaxabilityBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TaxabilityBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public TaxabilityBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public TaxabilityParams build() {
+        return new TaxabilityParams(this);
+      }
+    }
+
+    public enum Is {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ExportCreatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private ExportCreatedAtParams(ExportCreatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportCreatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportCreatedAtBuilder builder() {
+      return new ExportCreatedAtBuilder();
+    }
+
+    public static final class ExportCreatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private ExportCreatedAtBuilder() {}
+
+      public ExportCreatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public ExportCreatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public ExportCreatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public ExportCreatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public ExportCreatedAtParams build() {
+        return new ExportCreatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class ExportUpdatedAt2Params {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private ExportUpdatedAt2Params(ExportUpdatedAt2Builder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportUpdatedAt2Params. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportUpdatedAt2Builder builder() {
+      return new ExportUpdatedAt2Builder();
+    }
+
+    public static final class ExportUpdatedAt2Builder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private ExportUpdatedAt2Builder() {}
+
+      public ExportUpdatedAt2Builder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public ExportUpdatedAt2Builder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public ExportUpdatedAt2Builder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public ExportUpdatedAt2Builder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public ExportUpdatedAt2Params build() {
+        return new ExportUpdatedAt2Params(this);
+      }
+    }
+  }
+
+  public static final class ExportOfflinePaymentMethodParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ExportOfflinePaymentMethodParams(ExportOfflinePaymentMethodBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportOfflinePaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportOfflinePaymentMethodBuilder builder() {
+      return new ExportOfflinePaymentMethodBuilder();
+    }
+
+    public static final class ExportOfflinePaymentMethodBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ExportOfflinePaymentMethodBuilder() {}
+
+      public ExportOfflinePaymentMethodBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportOfflinePaymentMethodBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ExportOfflinePaymentMethodBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ExportOfflinePaymentMethodBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ExportOfflinePaymentMethodParams build() {
+        return new ExportOfflinePaymentMethodParams(this);
+      }
+    }
+
+    public enum Is {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ExportAutoCloseInvoicesParams {
+
+    private final Is is;
+
+    private ExportAutoCloseInvoicesParams(ExportAutoCloseInvoicesBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportAutoCloseInvoicesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportAutoCloseInvoicesBuilder builder() {
+      return new ExportAutoCloseInvoicesBuilder();
+    }
+
+    public static final class ExportAutoCloseInvoicesBuilder {
+
+      private Is is;
+
+      private ExportAutoCloseInvoicesBuilder() {}
+
+      public ExportAutoCloseInvoicesBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportAutoCloseInvoicesParams build() {
+        return new ExportAutoCloseInvoicesParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ExportChannel2Params {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ExportChannel2Params(ExportChannel2Builder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportChannel2Params. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportChannel2Builder builder() {
+      return new ExportChannel2Builder();
+    }
+
+    public static final class ExportChannel2Builder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ExportChannel2Builder() {}
+
+      public ExportChannel2Builder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportChannel2Builder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ExportChannel2Builder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ExportChannel2Builder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ExportChannel2Params build() {
+        return new ExportChannel2Params(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class RelationshipParams {
+
+    private final ParentIdParams parentId;
+
+    private final PaymentOwnerIdParams paymentOwnerId;
+
+    private final InvoiceOwnerIdParams invoiceOwnerId;
+
+    private RelationshipParams(RelationshipBuilder builder) {
+
+      this.parentId = builder.parentId;
+
+      this.paymentOwnerId = builder.paymentOwnerId;
+
+      this.invoiceOwnerId = builder.invoiceOwnerId;
+    }
+
+    public ParentIdParams getParentId() {
+      return parentId;
+    }
+
+    public PaymentOwnerIdParams getPaymentOwnerId() {
+      return paymentOwnerId;
+    }
+
+    public InvoiceOwnerIdParams getInvoiceOwnerId() {
+      return invoiceOwnerId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.parentId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.parentId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "parent_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.paymentOwnerId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.paymentOwnerId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "payment_owner_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.invoiceOwnerId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.invoiceOwnerId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "invoice_owner_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for RelationshipParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static RelationshipBuilder builder() {
+      return new RelationshipBuilder();
+    }
+
+    public static final class RelationshipBuilder {
+
+      private ParentIdParams parentId;
+
+      private PaymentOwnerIdParams paymentOwnerId;
+
+      private InvoiceOwnerIdParams invoiceOwnerId;
+
+      private RelationshipBuilder() {}
+
+      public RelationshipBuilder parentId(ParentIdParams value) {
+        this.parentId = value;
+        return this;
+      }
+
+      public RelationshipBuilder paymentOwnerId(PaymentOwnerIdParams value) {
+        this.paymentOwnerId = value;
+        return this;
+      }
+
+      public RelationshipBuilder invoiceOwnerId(InvoiceOwnerIdParams value) {
+        this.invoiceOwnerId = value;
+        return this;
+      }
+
+      public RelationshipParams build() {
+        return new RelationshipParams(this);
+      }
+    }
+  }
+
+  public static final class ParentIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private ParentIdParams(ParentIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ParentIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ParentIdBuilder builder() {
+      return new ParentIdBuilder();
+    }
+
+    public static final class ParentIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private ParentIdBuilder() {}
+
+      public ParentIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ParentIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ParentIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ParentIdParams build() {
+        return new ParentIdParams(this);
+      }
+    }
+  }
+
+  public static final class PaymentOwnerIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private PaymentOwnerIdParams(PaymentOwnerIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentOwnerIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentOwnerIdBuilder builder() {
+      return new PaymentOwnerIdBuilder();
+    }
+
+    public static final class PaymentOwnerIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private PaymentOwnerIdBuilder() {}
+
+      public PaymentOwnerIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PaymentOwnerIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PaymentOwnerIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PaymentOwnerIdParams build() {
+        return new PaymentOwnerIdParams(this);
+      }
+    }
+  }
+
+  public static final class InvoiceOwnerIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private InvoiceOwnerIdParams(InvoiceOwnerIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceOwnerIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceOwnerIdBuilder builder() {
+      return new InvoiceOwnerIdBuilder();
+    }
+
+    public static final class InvoiceOwnerIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private InvoiceOwnerIdBuilder() {}
+
+      public InvoiceOwnerIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public InvoiceOwnerIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public InvoiceOwnerIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public InvoiceOwnerIdParams build() {
+        return new InvoiceOwnerIdParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportDifferentialPricesParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportDifferentialPricesParams.java
new file mode 100644
index 00000000..893540ae
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportDifferentialPricesParams.java
@@ -0,0 +1,705 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportDifferentialPricesParams {
+
+  private final ItemIdParams itemId;
+
+  private final DifferentialPriceParams differentialPrice;
+
+  private ExportDifferentialPricesParams(ExportDifferentialPricesBuilder builder) {
+
+    this.itemId = builder.itemId;
+
+    this.differentialPrice = builder.differentialPrice;
+  }
+
+  public ItemIdParams getItemId() {
+    return itemId;
+  }
+
+  public DifferentialPriceParams getDifferentialPrice() {
+    return differentialPrice;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.itemId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.differentialPrice != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.differentialPrice.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "differential_price[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportDifferentialPricesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportDifferentialPricesBuilder builder() {
+    return new ExportDifferentialPricesBuilder();
+  }
+
+  public static final class ExportDifferentialPricesBuilder {
+
+    private ItemIdParams itemId;
+
+    private DifferentialPriceParams differentialPrice;
+
+    private ExportDifferentialPricesBuilder() {}
+
+    public ExportDifferentialPricesBuilder itemId(ItemIdParams value) {
+      this.itemId = value;
+      return this;
+    }
+
+    public ExportDifferentialPricesBuilder differentialPrice(DifferentialPriceParams value) {
+      this.differentialPrice = value;
+      return this;
+    }
+
+    public ExportDifferentialPricesParams build() {
+      return new ExportDifferentialPricesParams(this);
+    }
+  }
+
+  public static final class ItemIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemIdParams(ItemIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemIdBuilder builder() {
+      return new ItemIdBuilder();
+    }
+
+    public static final class ItemIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemIdBuilder() {}
+
+      public ItemIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ItemIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemIdParams build() {
+        return new ItemIdParams(this);
+      }
+    }
+  }
+
+  public static final class DifferentialPriceParams {
+
+    private final ItemPriceIdParams itemPriceId;
+
+    private final IdParams id;
+
+    private final ParentItemIdParams parentItemId;
+
+    private DifferentialPriceParams(DifferentialPriceBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.id = builder.id;
+
+      this.parentItemId = builder.parentItemId;
+    }
+
+    public ItemPriceIdParams getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public ParentItemIdParams getParentItemId() {
+      return parentItemId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.itemPriceId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "item_price_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.parentItemId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.parentItemId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "parent_item_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DifferentialPriceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DifferentialPriceBuilder builder() {
+      return new DifferentialPriceBuilder();
+    }
+
+    public static final class DifferentialPriceBuilder {
+
+      private ItemPriceIdParams itemPriceId;
+
+      private IdParams id;
+
+      private ParentItemIdParams parentItemId;
+
+      private DifferentialPriceBuilder() {}
+
+      public DifferentialPriceBuilder itemPriceId(ItemPriceIdParams value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DifferentialPriceBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public DifferentialPriceBuilder parentItemId(ParentItemIdParams value) {
+        this.parentItemId = value;
+        return this;
+      }
+
+      public DifferentialPriceParams build() {
+        return new DifferentialPriceParams(this);
+      }
+    }
+  }
+
+  public static final class ItemPriceIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemPriceIdParams(ItemPriceIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemPriceIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemPriceIdBuilder builder() {
+      return new ItemPriceIdBuilder();
+    }
+
+    public static final class ItemPriceIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemPriceIdBuilder() {}
+
+      public ItemPriceIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemPriceIdParams build() {
+        return new ItemPriceIdParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class ParentItemIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ParentItemIdParams(ParentItemIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ParentItemIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ParentItemIdBuilder builder() {
+      return new ParentItemIdBuilder();
+    }
+
+    public static final class ParentItemIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ParentItemIdBuilder() {}
+
+      public ParentItemIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ParentItemIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ParentItemIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ParentItemIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ParentItemIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ParentItemIdParams build() {
+        return new ParentItemIdParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportInvoicesParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportInvoicesParams.java
new file mode 100644
index 00000000..f903598e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportInvoicesParams.java
@@ -0,0 +1,3050 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportInvoicesParams {
+
+  private final PaymentOwnerParams paymentOwner;
+
+  private final InvoiceParams invoice;
+
+  private ExportInvoicesParams(ExportInvoicesBuilder builder) {
+
+    this.paymentOwner = builder.paymentOwner;
+
+    this.invoice = builder.invoice;
+  }
+
+  public PaymentOwnerParams getPaymentOwner() {
+    return paymentOwner;
+  }
+
+  public InvoiceParams getInvoice() {
+    return invoice;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.paymentOwner != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentOwner.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_owner[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.invoice != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.invoice.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "invoice[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportInvoicesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportInvoicesBuilder builder() {
+    return new ExportInvoicesBuilder();
+  }
+
+  public static final class ExportInvoicesBuilder {
+
+    private PaymentOwnerParams paymentOwner;
+
+    private InvoiceParams invoice;
+
+    private ExportInvoicesBuilder() {}
+
+    public ExportInvoicesBuilder paymentOwner(PaymentOwnerParams value) {
+      this.paymentOwner = value;
+      return this;
+    }
+
+    public ExportInvoicesBuilder invoice(InvoiceParams value) {
+      this.invoice = value;
+      return this;
+    }
+
+    public ExportInvoicesParams build() {
+      return new ExportInvoicesParams(this);
+    }
+  }
+
+  public static final class PaymentOwnerParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PaymentOwnerParams(PaymentOwnerBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentOwnerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentOwnerBuilder builder() {
+      return new PaymentOwnerBuilder();
+    }
+
+    public static final class PaymentOwnerBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private PaymentOwnerBuilder() {}
+
+      public PaymentOwnerBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PaymentOwnerBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PaymentOwnerBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PaymentOwnerBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PaymentOwnerBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PaymentOwnerParams build() {
+        return new PaymentOwnerParams(this);
+      }
+    }
+  }
+
+  public static final class InvoiceParams {
+
+    private final IdParams id;
+
+    private final SubscriptionIdParams subscriptionId;
+
+    private final CustomerIdParams customerId;
+
+    private final RecurringParams recurring;
+
+    private final StatusParams status;
+
+    private final PriceTypeParams priceType;
+
+    private final DateParams date;
+
+    private final PaidAtParams paidAt;
+
+    private final TotalParams total;
+
+    private final AmountPaidParams amountPaid;
+
+    private final AmountAdjustedParams amountAdjusted;
+
+    private final CreditsAppliedParams creditsApplied;
+
+    private final AmountDueParams amountDue;
+
+    private final DunningStatusParams dunningStatus;
+
+    private final UpdatedAtParams updatedAt;
+
+    private final ChannelParams channel;
+
+    private InvoiceParams(InvoiceBuilder builder) {
+
+      this.id = builder.id;
+
+      this.subscriptionId = builder.subscriptionId;
+
+      this.customerId = builder.customerId;
+
+      this.recurring = builder.recurring;
+
+      this.status = builder.status;
+
+      this.priceType = builder.priceType;
+
+      this.date = builder.date;
+
+      this.paidAt = builder.paidAt;
+
+      this.total = builder.total;
+
+      this.amountPaid = builder.amountPaid;
+
+      this.amountAdjusted = builder.amountAdjusted;
+
+      this.creditsApplied = builder.creditsApplied;
+
+      this.amountDue = builder.amountDue;
+
+      this.dunningStatus = builder.dunningStatus;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.channel = builder.channel;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public SubscriptionIdParams getSubscriptionId() {
+      return subscriptionId;
+    }
+
+    public CustomerIdParams getCustomerId() {
+      return customerId;
+    }
+
+    public RecurringParams getRecurring() {
+      return recurring;
+    }
+
+    public StatusParams getStatus() {
+      return status;
+    }
+
+    public PriceTypeParams getPriceType() {
+      return priceType;
+    }
+
+    public DateParams getDate() {
+      return date;
+    }
+
+    public PaidAtParams getPaidAt() {
+      return paidAt;
+    }
+
+    public TotalParams getTotal() {
+      return total;
+    }
+
+    public AmountPaidParams getAmountPaid() {
+      return amountPaid;
+    }
+
+    public AmountAdjustedParams getAmountAdjusted() {
+      return amountAdjusted;
+    }
+
+    public CreditsAppliedParams getCreditsApplied() {
+      return creditsApplied;
+    }
+
+    public AmountDueParams getAmountDue() {
+      return amountDue;
+    }
+
+    public DunningStatusParams getDunningStatus() {
+      return dunningStatus;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public ChannelParams getChannel() {
+      return channel;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.subscriptionId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.subscriptionId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "subscription_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.customerId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.customerId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "customer_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.recurring != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.recurring.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "recurring[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.priceType != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.priceType.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "price_type[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.date != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.date.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "date[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.paidAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.paidAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "paid_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.total != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.total.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "total[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountPaid != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountPaid.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_paid[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountAdjusted != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountAdjusted.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_adjusted[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.creditsApplied != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.creditsApplied.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "credits_applied[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountDue != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountDue.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_due[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.dunningStatus != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.dunningStatus.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "dunning_status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceBuilder builder() {
+      return new InvoiceBuilder();
+    }
+
+    public static final class InvoiceBuilder {
+
+      private IdParams id;
+
+      private SubscriptionIdParams subscriptionId;
+
+      private CustomerIdParams customerId;
+
+      private RecurringParams recurring;
+
+      private StatusParams status;
+
+      private PriceTypeParams priceType;
+
+      private DateParams date;
+
+      private PaidAtParams paidAt;
+
+      private TotalParams total;
+
+      private AmountPaidParams amountPaid;
+
+      private AmountAdjustedParams amountAdjusted;
+
+      private CreditsAppliedParams creditsApplied;
+
+      private AmountDueParams amountDue;
+
+      private DunningStatusParams dunningStatus;
+
+      private UpdatedAtParams updatedAt;
+
+      private ChannelParams channel;
+
+      private InvoiceBuilder() {}
+
+      public InvoiceBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public InvoiceBuilder subscriptionId(SubscriptionIdParams value) {
+        this.subscriptionId = value;
+        return this;
+      }
+
+      public InvoiceBuilder customerId(CustomerIdParams value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public InvoiceBuilder recurring(RecurringParams value) {
+        this.recurring = value;
+        return this;
+      }
+
+      public InvoiceBuilder status(StatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public InvoiceBuilder priceType(PriceTypeParams value) {
+        this.priceType = value;
+        return this;
+      }
+
+      public InvoiceBuilder date(DateParams value) {
+        this.date = value;
+        return this;
+      }
+
+      public InvoiceBuilder paidAt(PaidAtParams value) {
+        this.paidAt = value;
+        return this;
+      }
+
+      public InvoiceBuilder total(TotalParams value) {
+        this.total = value;
+        return this;
+      }
+
+      public InvoiceBuilder amountPaid(AmountPaidParams value) {
+        this.amountPaid = value;
+        return this;
+      }
+
+      public InvoiceBuilder amountAdjusted(AmountAdjustedParams value) {
+        this.amountAdjusted = value;
+        return this;
+      }
+
+      public InvoiceBuilder creditsApplied(CreditsAppliedParams value) {
+        this.creditsApplied = value;
+        return this;
+      }
+
+      public InvoiceBuilder amountDue(AmountDueParams value) {
+        this.amountDue = value;
+        return this;
+      }
+
+      public InvoiceBuilder dunningStatus(DunningStatusParams value) {
+        this.dunningStatus = value;
+        return this;
+      }
+
+      public InvoiceBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public InvoiceBuilder channel(ChannelParams value) {
+        this.channel = value;
+        return this;
+      }
+
+      public InvoiceParams build() {
+        return new InvoiceParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private final String in;
+
+    private final String notIn;
+
+    private SubscriptionIdParams(SubscriptionIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionIdBuilder builder() {
+      return new SubscriptionIdBuilder();
+    }
+
+    public static final class SubscriptionIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private String in;
+
+      private String notIn;
+
+      private SubscriptionIdBuilder() {}
+
+      public SubscriptionIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public SubscriptionIdParams build() {
+        return new SubscriptionIdParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CustomerIdParams(CustomerIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerIdBuilder builder() {
+      return new CustomerIdBuilder();
+    }
+
+    public static final class CustomerIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CustomerIdBuilder() {}
+
+      public CustomerIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CustomerIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CustomerIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CustomerIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CustomerIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CustomerIdParams build() {
+        return new CustomerIdParams(this);
+      }
+    }
+  }
+
+  public static final class RecurringParams {
+
+    private final Is is;
+
+    private RecurringParams(RecurringBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for RecurringParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static RecurringBuilder builder() {
+      return new RecurringBuilder();
+    }
+
+    public static final class RecurringBuilder {
+
+      private Is is;
+
+      private RecurringBuilder() {}
+
+      public RecurringBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public RecurringParams build() {
+        return new RecurringParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private StatusParams(StatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatusBuilder builder() {
+      return new StatusBuilder();
+    }
+
+    public static final class StatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private StatusBuilder() {}
+
+      public StatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public StatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public StatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public StatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public StatusParams build() {
+        return new StatusParams(this);
+      }
+    }
+
+    public enum Is {
+      PAID("paid"),
+
+      POSTED("posted"),
+
+      PAYMENT_DUE("payment_due"),
+
+      NOT_PAID("not_paid"),
+
+      VOIDED("voided"),
+
+      PENDING("pending"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      PAID("paid"),
+
+      POSTED("posted"),
+
+      PAYMENT_DUE("payment_due"),
+
+      NOT_PAID("not_paid"),
+
+      VOIDED("voided"),
+
+      PENDING("pending"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PriceTypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PriceTypeParams(PriceTypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PriceTypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PriceTypeBuilder builder() {
+      return new PriceTypeBuilder();
+    }
+
+    public static final class PriceTypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private PriceTypeBuilder() {}
+
+      public PriceTypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public PriceTypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PriceTypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PriceTypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PriceTypeParams build() {
+        return new PriceTypeParams(this);
+      }
+    }
+
+    public enum Is {
+      TAX_EXCLUSIVE("tax_exclusive"),
+
+      TAX_INCLUSIVE("tax_inclusive"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      TAX_EXCLUSIVE("tax_exclusive"),
+
+      TAX_INCLUSIVE("tax_inclusive"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DateParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private DateParams(DateBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DateParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DateBuilder builder() {
+      return new DateBuilder();
+    }
+
+    public static final class DateBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private DateBuilder() {}
+
+      public DateBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public DateBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public DateBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public DateBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public DateParams build() {
+        return new DateParams(this);
+      }
+    }
+  }
+
+  public static final class PaidAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private PaidAtParams(PaidAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaidAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaidAtBuilder builder() {
+      return new PaidAtBuilder();
+    }
+
+    public static final class PaidAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private PaidAtBuilder() {}
+
+      public PaidAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public PaidAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public PaidAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public PaidAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public PaidAtParams build() {
+        return new PaidAtParams(this);
+      }
+    }
+  }
+
+  public static final class TotalParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private TotalParams(TotalBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TotalParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TotalBuilder builder() {
+      return new TotalBuilder();
+    }
+
+    public static final class TotalBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private TotalBuilder() {}
+
+      public TotalBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public TotalBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TotalBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public TotalBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public TotalBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public TotalBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public TotalBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public TotalParams build() {
+        return new TotalParams(this);
+      }
+    }
+  }
+
+  public static final class AmountPaidParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountPaidParams(AmountPaidBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountPaidParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountPaidBuilder builder() {
+      return new AmountPaidBuilder();
+    }
+
+    public static final class AmountPaidBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountPaidBuilder() {}
+
+      public AmountPaidBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountPaidBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountPaidBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountPaidBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountPaidBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountPaidBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountPaidBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountPaidParams build() {
+        return new AmountPaidParams(this);
+      }
+    }
+  }
+
+  public static final class AmountAdjustedParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountAdjustedParams(AmountAdjustedBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountAdjustedParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountAdjustedBuilder builder() {
+      return new AmountAdjustedBuilder();
+    }
+
+    public static final class AmountAdjustedBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountAdjustedBuilder() {}
+
+      public AmountAdjustedBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountAdjustedParams build() {
+        return new AmountAdjustedParams(this);
+      }
+    }
+  }
+
+  public static final class CreditsAppliedParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private CreditsAppliedParams(CreditsAppliedBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreditsAppliedParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreditsAppliedBuilder builder() {
+      return new CreditsAppliedBuilder();
+    }
+
+    public static final class CreditsAppliedBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private CreditsAppliedBuilder() {}
+
+      public CreditsAppliedBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public CreditsAppliedParams build() {
+        return new CreditsAppliedParams(this);
+      }
+    }
+  }
+
+  public static final class AmountDueParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountDueParams(AmountDueBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountDueParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountDueBuilder builder() {
+      return new AmountDueBuilder();
+    }
+
+    public static final class AmountDueBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountDueBuilder() {}
+
+      public AmountDueBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountDueBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountDueBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountDueBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountDueBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountDueBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountDueBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountDueParams build() {
+        return new AmountDueParams(this);
+      }
+    }
+  }
+
+  public static final class DunningStatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private final IsPresent isPresent;
+
+    private DunningStatusParams(DunningStatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DunningStatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DunningStatusBuilder builder() {
+      return new DunningStatusBuilder();
+    }
+
+    public static final class DunningStatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private IsPresent isPresent;
+
+      private DunningStatusBuilder() {}
+
+      public DunningStatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public DunningStatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public DunningStatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public DunningStatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public DunningStatusBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public DunningStatusParams build() {
+        return new DunningStatusParams(this);
+      }
+    }
+
+    public enum Is {
+      IN_PROGRESS("in_progress"),
+
+      EXHAUSTED("exhausted"),
+
+      STOPPED("stopped"),
+
+      SUCCESS("success"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      IN_PROGRESS("in_progress"),
+
+      EXHAUSTED("exhausted"),
+
+      STOPPED("stopped"),
+
+      SUCCESS("success"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class ChannelParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ChannelParams(ChannelBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChannelParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChannelBuilder builder() {
+      return new ChannelBuilder();
+    }
+
+    public static final class ChannelBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ChannelBuilder() {}
+
+      public ChannelBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ChannelBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ChannelBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ChannelBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ChannelParams build() {
+        return new ChannelParams(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportItemFamiliesParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportItemFamiliesParams.java
new file mode 100644
index 00000000..5ac5bfe2
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportItemFamiliesParams.java
@@ -0,0 +1,715 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportItemFamiliesParams {
+
+  private final BusinessEntityIdParams businessEntityId;
+
+  private final IncludeSiteLevelResourcesParams includeSiteLevelResources;
+
+  private final ItemFamilyParams itemFamily;
+
+  private ExportItemFamiliesParams(ExportItemFamiliesBuilder builder) {
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.includeSiteLevelResources = builder.includeSiteLevelResources;
+
+    this.itemFamily = builder.itemFamily;
+  }
+
+  public BusinessEntityIdParams getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public IncludeSiteLevelResourcesParams getIncludeSiteLevelResources() {
+    return includeSiteLevelResources;
+  }
+
+  public ItemFamilyParams getItemFamily() {
+    return itemFamily;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.businessEntityId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.businessEntityId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "business_entity_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.includeSiteLevelResources != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.includeSiteLevelResources.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "include_site_level_resources[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemFamily != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemFamily.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_family[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportItemFamiliesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportItemFamiliesBuilder builder() {
+    return new ExportItemFamiliesBuilder();
+  }
+
+  public static final class ExportItemFamiliesBuilder {
+
+    private BusinessEntityIdParams businessEntityId;
+
+    private IncludeSiteLevelResourcesParams includeSiteLevelResources;
+
+    private ItemFamilyParams itemFamily;
+
+    private ExportItemFamiliesBuilder() {}
+
+    public ExportItemFamiliesBuilder businessEntityId(BusinessEntityIdParams value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public ExportItemFamiliesBuilder includeSiteLevelResources(
+        IncludeSiteLevelResourcesParams value) {
+      this.includeSiteLevelResources = value;
+      return this;
+    }
+
+    public ExportItemFamiliesBuilder itemFamily(ItemFamilyParams value) {
+      this.itemFamily = value;
+      return this;
+    }
+
+    public ExportItemFamiliesParams build() {
+      return new ExportItemFamiliesParams(this);
+    }
+  }
+
+  public static final class BusinessEntityIdParams {
+
+    private final IsPresent isPresent;
+
+    private final String is;
+
+    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
+
+      this.isPresent = builder.isPresent;
+
+      this.is = builder.is;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BusinessEntityIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BusinessEntityIdBuilder builder() {
+      return new BusinessEntityIdBuilder();
+    }
+
+    public static final class BusinessEntityIdBuilder {
+
+      private IsPresent isPresent;
+
+      private String is;
+
+      private BusinessEntityIdBuilder() {}
+
+      public BusinessEntityIdBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public BusinessEntityIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public BusinessEntityIdParams build() {
+        return new BusinessEntityIdParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class IncludeSiteLevelResourcesParams {
+
+    private final Is is;
+
+    private IncludeSiteLevelResourcesParams(IncludeSiteLevelResourcesBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IncludeSiteLevelResourcesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IncludeSiteLevelResourcesBuilder builder() {
+      return new IncludeSiteLevelResourcesBuilder();
+    }
+
+    public static final class IncludeSiteLevelResourcesBuilder {
+
+      private Is is;
+
+      private IncludeSiteLevelResourcesBuilder() {}
+
+      public IncludeSiteLevelResourcesBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public IncludeSiteLevelResourcesParams build() {
+        return new IncludeSiteLevelResourcesParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemFamilyParams {
+
+    private final IdParams id;
+
+    private final NameParams name;
+
+    private final UpdatedAtParams updatedAt;
+
+    private ItemFamilyParams(ItemFamilyBuilder builder) {
+
+      this.id = builder.id;
+
+      this.name = builder.name;
+
+      this.updatedAt = builder.updatedAt;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public NameParams getName() {
+      return name;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.name != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.name.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "name[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemFamilyParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemFamilyBuilder builder() {
+      return new ItemFamilyBuilder();
+    }
+
+    public static final class ItemFamilyBuilder {
+
+      private IdParams id;
+
+      private NameParams name;
+
+      private UpdatedAtParams updatedAt;
+
+      private ItemFamilyBuilder() {}
+
+      public ItemFamilyBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public ItemFamilyBuilder name(NameParams value) {
+        this.name = value;
+        return this;
+      }
+
+      public ItemFamilyBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public ItemFamilyParams build() {
+        return new ItemFamilyParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class NameParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private NameParams(NameBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NameParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NameBuilder builder() {
+      return new NameBuilder();
+    }
+
+    public static final class NameBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private NameBuilder() {}
+
+      public NameBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public NameBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public NameBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public NameParams build() {
+        return new NameParams(this);
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportItemPricesParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportItemPricesParams.java
new file mode 100644
index 00000000..c1956ce0
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportItemPricesParams.java
@@ -0,0 +1,2919 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportItemPricesParams {
+
+  private final ItemFamilyIdParams itemFamilyId;
+
+  private final ItemTypeParams itemType;
+
+  private final CurrencyCodeParams currencyCode;
+
+  private final BusinessEntityIdParams businessEntityId;
+
+  private final IncludeSiteLevelResourcesParams includeSiteLevelResources;
+
+  private final ItemPriceParams itemPrice;
+
+  private ExportItemPricesParams(ExportItemPricesBuilder builder) {
+
+    this.itemFamilyId = builder.itemFamilyId;
+
+    this.itemType = builder.itemType;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.includeSiteLevelResources = builder.includeSiteLevelResources;
+
+    this.itemPrice = builder.itemPrice;
+  }
+
+  public ItemFamilyIdParams getItemFamilyId() {
+    return itemFamilyId;
+  }
+
+  public ItemTypeParams getItemType() {
+    return itemType;
+  }
+
+  public CurrencyCodeParams getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public BusinessEntityIdParams getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public IncludeSiteLevelResourcesParams getIncludeSiteLevelResources() {
+    return includeSiteLevelResources;
+  }
+
+  public ItemPriceParams getItemPrice() {
+    return itemPrice;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.itemFamilyId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemFamilyId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_family_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemType != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemType.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_type[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.currencyCode != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.currencyCode.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "currency_code[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.businessEntityId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.businessEntityId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "business_entity_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.includeSiteLevelResources != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.includeSiteLevelResources.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "include_site_level_resources[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemPrice != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemPrice.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_price[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportItemPricesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportItemPricesBuilder builder() {
+    return new ExportItemPricesBuilder();
+  }
+
+  public static final class ExportItemPricesBuilder {
+
+    private ItemFamilyIdParams itemFamilyId;
+
+    private ItemTypeParams itemType;
+
+    private CurrencyCodeParams currencyCode;
+
+    private BusinessEntityIdParams businessEntityId;
+
+    private IncludeSiteLevelResourcesParams includeSiteLevelResources;
+
+    private ItemPriceParams itemPrice;
+
+    private ExportItemPricesBuilder() {}
+
+    public ExportItemPricesBuilder itemFamilyId(ItemFamilyIdParams value) {
+      this.itemFamilyId = value;
+      return this;
+    }
+
+    public ExportItemPricesBuilder itemType(ItemTypeParams value) {
+      this.itemType = value;
+      return this;
+    }
+
+    public ExportItemPricesBuilder currencyCode(CurrencyCodeParams value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public ExportItemPricesBuilder businessEntityId(BusinessEntityIdParams value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public ExportItemPricesBuilder includeSiteLevelResources(
+        IncludeSiteLevelResourcesParams value) {
+      this.includeSiteLevelResources = value;
+      return this;
+    }
+
+    public ExportItemPricesBuilder itemPrice(ItemPriceParams value) {
+      this.itemPrice = value;
+      return this;
+    }
+
+    public ExportItemPricesParams build() {
+      return new ExportItemPricesParams(this);
+    }
+  }
+
+  public static final class ItemFamilyIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemFamilyIdParams(ItemFamilyIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemFamilyIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemFamilyIdBuilder builder() {
+      return new ItemFamilyIdBuilder();
+    }
+
+    public static final class ItemFamilyIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemFamilyIdBuilder() {}
+
+      public ItemFamilyIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemFamilyIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemFamilyIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ItemFamilyIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemFamilyIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemFamilyIdParams build() {
+        return new ItemFamilyIdParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemTypeParams(ItemTypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTypeBuilder builder() {
+      return new ItemTypeBuilder();
+    }
+
+    public static final class ItemTypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemTypeBuilder() {}
+
+      public ItemTypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemTypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemTypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemTypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemTypeParams build() {
+        return new ItemTypeParams(this);
+      }
+    }
+
+    public enum Is {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CurrencyCodeParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CurrencyCodeParams(CurrencyCodeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CurrencyCodeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CurrencyCodeBuilder builder() {
+      return new CurrencyCodeBuilder();
+    }
+
+    public static final class CurrencyCodeBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CurrencyCodeBuilder() {}
+
+      public CurrencyCodeBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CurrencyCodeParams build() {
+        return new CurrencyCodeParams(this);
+      }
+    }
+  }
+
+  public static final class BusinessEntityIdParams {
+
+    private final IsPresent isPresent;
+
+    private final String is;
+
+    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
+
+      this.isPresent = builder.isPresent;
+
+      this.is = builder.is;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BusinessEntityIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BusinessEntityIdBuilder builder() {
+      return new BusinessEntityIdBuilder();
+    }
+
+    public static final class BusinessEntityIdBuilder {
+
+      private IsPresent isPresent;
+
+      private String is;
+
+      private BusinessEntityIdBuilder() {}
+
+      public BusinessEntityIdBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public BusinessEntityIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public BusinessEntityIdParams build() {
+        return new BusinessEntityIdParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class IncludeSiteLevelResourcesParams {
+
+    private final Is is;
+
+    private IncludeSiteLevelResourcesParams(IncludeSiteLevelResourcesBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IncludeSiteLevelResourcesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IncludeSiteLevelResourcesBuilder builder() {
+      return new IncludeSiteLevelResourcesBuilder();
+    }
+
+    public static final class IncludeSiteLevelResourcesBuilder {
+
+      private Is is;
+
+      private IncludeSiteLevelResourcesBuilder() {}
+
+      public IncludeSiteLevelResourcesBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public IncludeSiteLevelResourcesParams build() {
+        return new IncludeSiteLevelResourcesParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemPriceParams {
+
+    private final IdParams id;
+
+    private final NameParams name;
+
+    private final PricingModelParams pricingModel;
+
+    private final ItemIdParams itemId;
+
+    private final PriceVariantIdParams priceVariantId;
+
+    private final TrialPeriodParams trialPeriod;
+
+    private final TrialPeriodUnitParams trialPeriodUnit;
+
+    private final StatusParams status;
+
+    private final UpdatedAtParams updatedAt;
+
+    private final PeriodUnitParams periodUnit;
+
+    private final PeriodParams period;
+
+    private final ChannelParams channel;
+
+    private ItemPriceParams(ItemPriceBuilder builder) {
+
+      this.id = builder.id;
+
+      this.name = builder.name;
+
+      this.pricingModel = builder.pricingModel;
+
+      this.itemId = builder.itemId;
+
+      this.priceVariantId = builder.priceVariantId;
+
+      this.trialPeriod = builder.trialPeriod;
+
+      this.trialPeriodUnit = builder.trialPeriodUnit;
+
+      this.status = builder.status;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.period = builder.period;
+
+      this.channel = builder.channel;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public NameParams getName() {
+      return name;
+    }
+
+    public PricingModelParams getPricingModel() {
+      return pricingModel;
+    }
+
+    public ItemIdParams getItemId() {
+      return itemId;
+    }
+
+    public PriceVariantIdParams getPriceVariantId() {
+      return priceVariantId;
+    }
+
+    public TrialPeriodParams getTrialPeriod() {
+      return trialPeriod;
+    }
+
+    public TrialPeriodUnitParams getTrialPeriodUnit() {
+      return trialPeriodUnit;
+    }
+
+    public StatusParams getStatus() {
+      return status;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public PeriodUnitParams getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public PeriodParams getPeriod() {
+      return period;
+    }
+
+    public ChannelParams getChannel() {
+      return channel;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.name != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.name.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "name[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.pricingModel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.pricingModel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "pricing_model[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.itemId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.itemId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "item_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.priceVariantId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.priceVariantId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "price_variant_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.trialPeriod != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.trialPeriod.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "trial_period[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.trialPeriodUnit != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.trialPeriodUnit.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "trial_period_unit[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.periodUnit != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.periodUnit.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "period_unit[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.period != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.period.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "period[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemPriceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemPriceBuilder builder() {
+      return new ItemPriceBuilder();
+    }
+
+    public static final class ItemPriceBuilder {
+
+      private IdParams id;
+
+      private NameParams name;
+
+      private PricingModelParams pricingModel;
+
+      private ItemIdParams itemId;
+
+      private PriceVariantIdParams priceVariantId;
+
+      private TrialPeriodParams trialPeriod;
+
+      private TrialPeriodUnitParams trialPeriodUnit;
+
+      private StatusParams status;
+
+      private UpdatedAtParams updatedAt;
+
+      private PeriodUnitParams periodUnit;
+
+      private PeriodParams period;
+
+      private ChannelParams channel;
+
+      private ItemPriceBuilder() {}
+
+      public ItemPriceBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public ItemPriceBuilder name(NameParams value) {
+        this.name = value;
+        return this;
+      }
+
+      public ItemPriceBuilder pricingModel(PricingModelParams value) {
+        this.pricingModel = value;
+        return this;
+      }
+
+      public ItemPriceBuilder itemId(ItemIdParams value) {
+        this.itemId = value;
+        return this;
+      }
+
+      public ItemPriceBuilder priceVariantId(PriceVariantIdParams value) {
+        this.priceVariantId = value;
+        return this;
+      }
+
+      public ItemPriceBuilder trialPeriod(TrialPeriodParams value) {
+        this.trialPeriod = value;
+        return this;
+      }
+
+      public ItemPriceBuilder trialPeriodUnit(TrialPeriodUnitParams value) {
+        this.trialPeriodUnit = value;
+        return this;
+      }
+
+      public ItemPriceBuilder status(StatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public ItemPriceBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public ItemPriceBuilder periodUnit(PeriodUnitParams value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public ItemPriceBuilder period(PeriodParams value) {
+        this.period = value;
+        return this;
+      }
+
+      public ItemPriceBuilder channel(ChannelParams value) {
+        this.channel = value;
+        return this;
+      }
+
+      public ItemPriceParams build() {
+        return new ItemPriceParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class NameParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private NameParams(NameBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NameParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NameBuilder builder() {
+      return new NameBuilder();
+    }
+
+    public static final class NameBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private NameBuilder() {}
+
+      public NameBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public NameBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public NameBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public NameBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public NameBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public NameParams build() {
+        return new NameParams(this);
+      }
+    }
+  }
+
+  public static final class PricingModelParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PricingModelParams(PricingModelBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PricingModelParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PricingModelBuilder builder() {
+      return new PricingModelBuilder();
+    }
+
+    public static final class PricingModelBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private PricingModelBuilder() {}
+
+      public PricingModelBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public PricingModelBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PricingModelBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PricingModelBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PricingModelParams build() {
+        return new PricingModelParams(this);
+      }
+    }
+
+    public enum Is {
+      FLAT_FEE("flat_fee"),
+
+      PER_UNIT("per_unit"),
+
+      TIERED("tiered"),
+
+      VOLUME("volume"),
+
+      STAIRSTEP("stairstep"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      FLAT_FEE("flat_fee"),
+
+      PER_UNIT("per_unit"),
+
+      TIERED("tiered"),
+
+      VOLUME("volume"),
+
+      STAIRSTEP("stairstep"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemIdParams(ItemIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemIdBuilder builder() {
+      return new ItemIdBuilder();
+    }
+
+    public static final class ItemIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemIdBuilder() {}
+
+      public ItemIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ItemIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemIdParams build() {
+        return new ItemIdParams(this);
+      }
+    }
+  }
+
+  public static final class PriceVariantIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PriceVariantIdParams(PriceVariantIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PriceVariantIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PriceVariantIdBuilder builder() {
+      return new PriceVariantIdBuilder();
+    }
+
+    public static final class PriceVariantIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private PriceVariantIdBuilder() {}
+
+      public PriceVariantIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PriceVariantIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PriceVariantIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PriceVariantIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PriceVariantIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PriceVariantIdParams build() {
+        return new PriceVariantIdParams(this);
+      }
+    }
+  }
+
+  public static final class TrialPeriodParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private TrialPeriodParams(TrialPeriodBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TrialPeriodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TrialPeriodBuilder builder() {
+      return new TrialPeriodBuilder();
+    }
+
+    public static final class TrialPeriodBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private TrialPeriodBuilder() {}
+
+      public TrialPeriodBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public TrialPeriodBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TrialPeriodBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public TrialPeriodBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public TrialPeriodBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public TrialPeriodBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public TrialPeriodBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public TrialPeriodParams build() {
+        return new TrialPeriodParams(this);
+      }
+    }
+  }
+
+  public static final class TrialPeriodUnitParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private TrialPeriodUnitParams(TrialPeriodUnitBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TrialPeriodUnitParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TrialPeriodUnitBuilder builder() {
+      return new TrialPeriodUnitBuilder();
+    }
+
+    public static final class TrialPeriodUnitBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private TrialPeriodUnitBuilder() {}
+
+      public TrialPeriodUnitBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public TrialPeriodUnitBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TrialPeriodUnitBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public TrialPeriodUnitBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public TrialPeriodUnitParams build() {
+        return new TrialPeriodUnitParams(this);
+      }
+    }
+
+    public enum Is {
+      DAY("day"),
+
+      MONTH("month"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      DAY("day"),
+
+      MONTH("month"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private StatusParams(StatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatusBuilder builder() {
+      return new StatusBuilder();
+    }
+
+    public static final class StatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private StatusBuilder() {}
+
+      public StatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public StatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public StatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public StatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public StatusParams build() {
+        return new StatusParams(this);
+      }
+    }
+
+    public enum Is {
+      ACTIVE("active"),
+
+      ARCHIVED("archived"),
+
+      DELETED("deleted"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ACTIVE("active"),
+
+      ARCHIVED("archived"),
+
+      DELETED("deleted"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class PeriodUnitParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PeriodUnitParams(PeriodUnitBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PeriodUnitParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PeriodUnitBuilder builder() {
+      return new PeriodUnitBuilder();
+    }
+
+    public static final class PeriodUnitBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private PeriodUnitBuilder() {}
+
+      public PeriodUnitBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public PeriodUnitBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PeriodUnitBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PeriodUnitBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PeriodUnitParams build() {
+        return new PeriodUnitParams(this);
+      }
+    }
+
+    public enum Is {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PeriodParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private PeriodParams(PeriodBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PeriodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PeriodBuilder builder() {
+      return new PeriodBuilder();
+    }
+
+    public static final class PeriodBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private PeriodBuilder() {}
+
+      public PeriodBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PeriodBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PeriodBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public PeriodBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public PeriodBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public PeriodBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public PeriodBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public PeriodParams build() {
+        return new PeriodParams(this);
+      }
+    }
+  }
+
+  public static final class ChannelParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ChannelParams(ChannelBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChannelParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChannelBuilder builder() {
+      return new ChannelBuilder();
+    }
+
+    public static final class ChannelBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ChannelBuilder() {}
+
+      public ChannelBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ChannelBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ChannelBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ChannelBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ChannelParams build() {
+        return new ChannelParams(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportItemsParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportItemsParams.java
new file mode 100644
index 00000000..7f3d7407
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportItemsParams.java
@@ -0,0 +1,2232 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportItemsParams {
+
+  private final BusinessEntityIdParams businessEntityId;
+
+  private final IncludeSiteLevelResourcesParams includeSiteLevelResources;
+
+  private final ItemParams item;
+
+  private ExportItemsParams(ExportItemsBuilder builder) {
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.includeSiteLevelResources = builder.includeSiteLevelResources;
+
+    this.item = builder.item;
+  }
+
+  public BusinessEntityIdParams getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public IncludeSiteLevelResourcesParams getIncludeSiteLevelResources() {
+    return includeSiteLevelResources;
+  }
+
+  public ItemParams getItem() {
+    return item;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.businessEntityId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.businessEntityId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "business_entity_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.includeSiteLevelResources != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.includeSiteLevelResources.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "include_site_level_resources[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.item != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.item.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportItemsBuilder builder() {
+    return new ExportItemsBuilder();
+  }
+
+  public static final class ExportItemsBuilder {
+
+    private BusinessEntityIdParams businessEntityId;
+
+    private IncludeSiteLevelResourcesParams includeSiteLevelResources;
+
+    private ItemParams item;
+
+    private ExportItemsBuilder() {}
+
+    public ExportItemsBuilder businessEntityId(BusinessEntityIdParams value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public ExportItemsBuilder includeSiteLevelResources(IncludeSiteLevelResourcesParams value) {
+      this.includeSiteLevelResources = value;
+      return this;
+    }
+
+    public ExportItemsBuilder item(ItemParams value) {
+      this.item = value;
+      return this;
+    }
+
+    public ExportItemsParams build() {
+      return new ExportItemsParams(this);
+    }
+  }
+
+  public static final class BusinessEntityIdParams {
+
+    private final IsPresent isPresent;
+
+    private final String is;
+
+    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
+
+      this.isPresent = builder.isPresent;
+
+      this.is = builder.is;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BusinessEntityIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BusinessEntityIdBuilder builder() {
+      return new BusinessEntityIdBuilder();
+    }
+
+    public static final class BusinessEntityIdBuilder {
+
+      private IsPresent isPresent;
+
+      private String is;
+
+      private BusinessEntityIdBuilder() {}
+
+      public BusinessEntityIdBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public BusinessEntityIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public BusinessEntityIdParams build() {
+        return new BusinessEntityIdParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class IncludeSiteLevelResourcesParams {
+
+    private final Is is;
+
+    private IncludeSiteLevelResourcesParams(IncludeSiteLevelResourcesBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IncludeSiteLevelResourcesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IncludeSiteLevelResourcesBuilder builder() {
+      return new IncludeSiteLevelResourcesBuilder();
+    }
+
+    public static final class IncludeSiteLevelResourcesBuilder {
+
+      private Is is;
+
+      private IncludeSiteLevelResourcesBuilder() {}
+
+      public IncludeSiteLevelResourcesBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public IncludeSiteLevelResourcesParams build() {
+        return new IncludeSiteLevelResourcesParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemParams {
+
+    private final IdParams id;
+
+    private final ItemFamilyIdParams itemFamilyId;
+
+    private final TypeParams type;
+
+    private final NameParams name;
+
+    private final ItemApplicabilityParams itemApplicability;
+
+    private final StatusParams status;
+
+    private final IsGiftableParams isGiftable;
+
+    private final UpdatedAtParams updatedAt;
+
+    private final EnabledForCheckoutParams enabledForCheckout;
+
+    private final EnabledInPortalParams enabledInPortal;
+
+    private final MeteredParams metered;
+
+    private final UsageCalculationParams usageCalculation;
+
+    private final ChannelParams channel;
+
+    private ItemParams(ItemBuilder builder) {
+
+      this.id = builder.id;
+
+      this.itemFamilyId = builder.itemFamilyId;
+
+      this.type = builder.type;
+
+      this.name = builder.name;
+
+      this.itemApplicability = builder.itemApplicability;
+
+      this.status = builder.status;
+
+      this.isGiftable = builder.isGiftable;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.enabledForCheckout = builder.enabledForCheckout;
+
+      this.enabledInPortal = builder.enabledInPortal;
+
+      this.metered = builder.metered;
+
+      this.usageCalculation = builder.usageCalculation;
+
+      this.channel = builder.channel;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public ItemFamilyIdParams getItemFamilyId() {
+      return itemFamilyId;
+    }
+
+    public TypeParams getType() {
+      return type;
+    }
+
+    public NameParams getName() {
+      return name;
+    }
+
+    public ItemApplicabilityParams getItemApplicability() {
+      return itemApplicability;
+    }
+
+    public StatusParams getStatus() {
+      return status;
+    }
+
+    public IsGiftableParams getIsGiftable() {
+      return isGiftable;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public EnabledForCheckoutParams getEnabledForCheckout() {
+      return enabledForCheckout;
+    }
+
+    public EnabledInPortalParams getEnabledInPortal() {
+      return enabledInPortal;
+    }
+
+    public MeteredParams getMetered() {
+      return metered;
+    }
+
+    public UsageCalculationParams getUsageCalculation() {
+      return usageCalculation;
+    }
+
+    public ChannelParams getChannel() {
+      return channel;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.itemFamilyId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.itemFamilyId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "item_family_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.type != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.type.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "type[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.name != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.name.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "name[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.itemApplicability != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.itemApplicability.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "item_applicability[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.isGiftable != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.isGiftable.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "is_giftable[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.enabledForCheckout != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.enabledForCheckout.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "enabled_for_checkout[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.enabledInPortal != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.enabledInPortal.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "enabled_in_portal[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.metered != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.metered.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "metered[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.usageCalculation != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.usageCalculation.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "usage_calculation[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemBuilder builder() {
+      return new ItemBuilder();
+    }
+
+    public static final class ItemBuilder {
+
+      private IdParams id;
+
+      private ItemFamilyIdParams itemFamilyId;
+
+      private TypeParams type;
+
+      private NameParams name;
+
+      private ItemApplicabilityParams itemApplicability;
+
+      private StatusParams status;
+
+      private IsGiftableParams isGiftable;
+
+      private UpdatedAtParams updatedAt;
+
+      private EnabledForCheckoutParams enabledForCheckout;
+
+      private EnabledInPortalParams enabledInPortal;
+
+      private MeteredParams metered;
+
+      private UsageCalculationParams usageCalculation;
+
+      private ChannelParams channel;
+
+      private ItemBuilder() {}
+
+      public ItemBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public ItemBuilder itemFamilyId(ItemFamilyIdParams value) {
+        this.itemFamilyId = value;
+        return this;
+      }
+
+      public ItemBuilder type(TypeParams value) {
+        this.type = value;
+        return this;
+      }
+
+      public ItemBuilder name(NameParams value) {
+        this.name = value;
+        return this;
+      }
+
+      public ItemBuilder itemApplicability(ItemApplicabilityParams value) {
+        this.itemApplicability = value;
+        return this;
+      }
+
+      public ItemBuilder status(StatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public ItemBuilder isGiftable(IsGiftableParams value) {
+        this.isGiftable = value;
+        return this;
+      }
+
+      public ItemBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public ItemBuilder enabledForCheckout(EnabledForCheckoutParams value) {
+        this.enabledForCheckout = value;
+        return this;
+      }
+
+      public ItemBuilder enabledInPortal(EnabledInPortalParams value) {
+        this.enabledInPortal = value;
+        return this;
+      }
+
+      public ItemBuilder metered(MeteredParams value) {
+        this.metered = value;
+        return this;
+      }
+
+      public ItemBuilder usageCalculation(UsageCalculationParams value) {
+        this.usageCalculation = value;
+        return this;
+      }
+
+      public ItemBuilder channel(ChannelParams value) {
+        this.channel = value;
+        return this;
+      }
+
+      public ItemParams build() {
+        return new ItemParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class ItemFamilyIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemFamilyIdParams(ItemFamilyIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemFamilyIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemFamilyIdBuilder builder() {
+      return new ItemFamilyIdBuilder();
+    }
+
+    public static final class ItemFamilyIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemFamilyIdBuilder() {}
+
+      public ItemFamilyIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemFamilyIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemFamilyIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ItemFamilyIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemFamilyIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemFamilyIdParams build() {
+        return new ItemFamilyIdParams(this);
+      }
+    }
+  }
+
+  public static final class TypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private TypeParams(TypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TypeBuilder builder() {
+      return new TypeBuilder();
+    }
+
+    public static final class TypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private TypeBuilder() {}
+
+      public TypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public TypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public TypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public TypeParams build() {
+        return new TypeParams(this);
+      }
+    }
+
+    public enum Is {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class NameParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private NameParams(NameBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NameParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NameBuilder builder() {
+      return new NameBuilder();
+    }
+
+    public static final class NameBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private NameBuilder() {}
+
+      public NameBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public NameBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public NameBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public NameParams build() {
+        return new NameParams(this);
+      }
+    }
+  }
+
+  public static final class ItemApplicabilityParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemApplicabilityParams(ItemApplicabilityBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemApplicabilityParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemApplicabilityBuilder builder() {
+      return new ItemApplicabilityBuilder();
+    }
+
+    public static final class ItemApplicabilityBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemApplicabilityBuilder() {}
+
+      public ItemApplicabilityBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemApplicabilityBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemApplicabilityBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemApplicabilityBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemApplicabilityParams build() {
+        return new ItemApplicabilityParams(this);
+      }
+    }
+
+    public enum Is {
+      ALL("all"),
+
+      RESTRICTED("restricted"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ALL("all"),
+
+      RESTRICTED("restricted"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private StatusParams(StatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatusBuilder builder() {
+      return new StatusBuilder();
+    }
+
+    public static final class StatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private StatusBuilder() {}
+
+      public StatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public StatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public StatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public StatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public StatusParams build() {
+        return new StatusParams(this);
+      }
+    }
+
+    public enum Is {
+      ACTIVE("active"),
+
+      ARCHIVED("archived"),
+
+      DELETED("deleted"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ACTIVE("active"),
+
+      ARCHIVED("archived"),
+
+      DELETED("deleted"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class IsGiftableParams {
+
+    private final Is is;
+
+    private IsGiftableParams(IsGiftableBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IsGiftableParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IsGiftableBuilder builder() {
+      return new IsGiftableBuilder();
+    }
+
+    public static final class IsGiftableBuilder {
+
+      private Is is;
+
+      private IsGiftableBuilder() {}
+
+      public IsGiftableBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public IsGiftableParams build() {
+        return new IsGiftableParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class EnabledForCheckoutParams {
+
+    private final Is is;
+
+    private EnabledForCheckoutParams(EnabledForCheckoutBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EnabledForCheckoutParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EnabledForCheckoutBuilder builder() {
+      return new EnabledForCheckoutBuilder();
+    }
+
+    public static final class EnabledForCheckoutBuilder {
+
+      private Is is;
+
+      private EnabledForCheckoutBuilder() {}
+
+      public EnabledForCheckoutBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public EnabledForCheckoutParams build() {
+        return new EnabledForCheckoutParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class EnabledInPortalParams {
+
+    private final Is is;
+
+    private EnabledInPortalParams(EnabledInPortalBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EnabledInPortalParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EnabledInPortalBuilder builder() {
+      return new EnabledInPortalBuilder();
+    }
+
+    public static final class EnabledInPortalBuilder {
+
+      private Is is;
+
+      private EnabledInPortalBuilder() {}
+
+      public EnabledInPortalBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public EnabledInPortalParams build() {
+        return new EnabledInPortalParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class MeteredParams {
+
+    private final Is is;
+
+    private MeteredParams(MeteredBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for MeteredParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static MeteredBuilder builder() {
+      return new MeteredBuilder();
+    }
+
+    public static final class MeteredBuilder {
+
+      private Is is;
+
+      private MeteredBuilder() {}
+
+      public MeteredBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public MeteredParams build() {
+        return new MeteredParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class UsageCalculationParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private UsageCalculationParams(UsageCalculationBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UsageCalculationParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UsageCalculationBuilder builder() {
+      return new UsageCalculationBuilder();
+    }
+
+    public static final class UsageCalculationBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private UsageCalculationBuilder() {}
+
+      public UsageCalculationBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public UsageCalculationBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public UsageCalculationBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public UsageCalculationBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public UsageCalculationParams build() {
+        return new UsageCalculationParams(this);
+      }
+    }
+
+    public enum Is {
+      SUM_OF_USAGES("sum_of_usages"),
+
+      LAST_USAGE("last_usage"),
+
+      MAX_USAGE("max_usage"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      SUM_OF_USAGES("sum_of_usages"),
+
+      LAST_USAGE("last_usage"),
+
+      MAX_USAGE("max_usage"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChannelParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ChannelParams(ChannelBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChannelParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChannelBuilder builder() {
+      return new ChannelBuilder();
+    }
+
+    public static final class ChannelBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ChannelBuilder() {}
+
+      public ChannelBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ChannelBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ChannelBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ChannelBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ChannelParams build() {
+        return new ChannelParams(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportOrdersParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportOrdersParams.java
new file mode 100644
index 00000000..cde89a44
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportOrdersParams.java
@@ -0,0 +1,2991 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportOrdersParams {
+
+  private final TotalParams total;
+
+  private final OrderParams order;
+
+  private ExportOrdersParams(ExportOrdersBuilder builder) {
+
+    this.total = builder.total;
+
+    this.order = builder.order;
+  }
+
+  public TotalParams getTotal() {
+    return total;
+  }
+
+  public OrderParams getOrder() {
+    return order;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.total != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.total.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "total[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.order != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.order.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "order[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportOrdersParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportOrdersBuilder builder() {
+    return new ExportOrdersBuilder();
+  }
+
+  public static final class ExportOrdersBuilder {
+
+    private TotalParams total;
+
+    private OrderParams order;
+
+    private ExportOrdersBuilder() {}
+
+    public ExportOrdersBuilder total(TotalParams value) {
+      this.total = value;
+      return this;
+    }
+
+    public ExportOrdersBuilder order(OrderParams value) {
+      this.order = value;
+      return this;
+    }
+
+    public ExportOrdersParams build() {
+      return new ExportOrdersParams(this);
+    }
+  }
+
+  public static final class TotalParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private TotalParams(TotalBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TotalParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TotalBuilder builder() {
+      return new TotalBuilder();
+    }
+
+    public static final class TotalBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private TotalBuilder() {}
+
+      public TotalBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public TotalBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TotalBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public TotalBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public TotalBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public TotalBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public TotalBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public TotalParams build() {
+        return new TotalParams(this);
+      }
+    }
+  }
+
+  public static final class OrderParams {
+
+    private final IdParams id;
+
+    private final SubscriptionIdParams subscriptionId;
+
+    private final CustomerIdParams customerId;
+
+    private final StatusParams status;
+
+    private final PriceTypeParams priceType;
+
+    private final OrderDateParams orderDate;
+
+    private final ShippingDateParams shippingDate;
+
+    private final ShippedAtParams shippedAt;
+
+    private final DeliveredAtParams deliveredAt;
+
+    private final CancelledAtParams cancelledAt;
+
+    private final AmountPaidParams amountPaid;
+
+    private final RefundableCreditsParams refundableCredits;
+
+    private final RefundableCreditsIssuedParams refundableCreditsIssued;
+
+    private final UpdatedAtParams updatedAt;
+
+    private final ResentStatusParams resentStatus;
+
+    private final IsResentParams isResent;
+
+    private final OriginalOrderIdParams originalOrderId;
+
+    private OrderParams(OrderBuilder builder) {
+
+      this.id = builder.id;
+
+      this.subscriptionId = builder.subscriptionId;
+
+      this.customerId = builder.customerId;
+
+      this.status = builder.status;
+
+      this.priceType = builder.priceType;
+
+      this.orderDate = builder.orderDate;
+
+      this.shippingDate = builder.shippingDate;
+
+      this.shippedAt = builder.shippedAt;
+
+      this.deliveredAt = builder.deliveredAt;
+
+      this.cancelledAt = builder.cancelledAt;
+
+      this.amountPaid = builder.amountPaid;
+
+      this.refundableCredits = builder.refundableCredits;
+
+      this.refundableCreditsIssued = builder.refundableCreditsIssued;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.resentStatus = builder.resentStatus;
+
+      this.isResent = builder.isResent;
+
+      this.originalOrderId = builder.originalOrderId;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public SubscriptionIdParams getSubscriptionId() {
+      return subscriptionId;
+    }
+
+    public CustomerIdParams getCustomerId() {
+      return customerId;
+    }
+
+    public StatusParams getStatus() {
+      return status;
+    }
+
+    public PriceTypeParams getPriceType() {
+      return priceType;
+    }
+
+    public OrderDateParams getOrderDate() {
+      return orderDate;
+    }
+
+    public ShippingDateParams getShippingDate() {
+      return shippingDate;
+    }
+
+    public ShippedAtParams getShippedAt() {
+      return shippedAt;
+    }
+
+    public DeliveredAtParams getDeliveredAt() {
+      return deliveredAt;
+    }
+
+    public CancelledAtParams getCancelledAt() {
+      return cancelledAt;
+    }
+
+    public AmountPaidParams getAmountPaid() {
+      return amountPaid;
+    }
+
+    public RefundableCreditsParams getRefundableCredits() {
+      return refundableCredits;
+    }
+
+    public RefundableCreditsIssuedParams getRefundableCreditsIssued() {
+      return refundableCreditsIssued;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public ResentStatusParams getResentStatus() {
+      return resentStatus;
+    }
+
+    public IsResentParams getIsResent() {
+      return isResent;
+    }
+
+    public OriginalOrderIdParams getOriginalOrderId() {
+      return originalOrderId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.subscriptionId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.subscriptionId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "subscription_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.customerId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.customerId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "customer_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.priceType != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.priceType.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "price_type[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.orderDate != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.orderDate.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "order_date[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.shippingDate != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.shippingDate.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "shipping_date[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.shippedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.shippedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "shipped_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.deliveredAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.deliveredAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "delivered_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.cancelledAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.cancelledAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "cancelled_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountPaid != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountPaid.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_paid[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.refundableCredits != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.refundableCredits.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "refundable_credits[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.refundableCreditsIssued != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.refundableCreditsIssued.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "refundable_credits_issued[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.resentStatus != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.resentStatus.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "resent_status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.isResent != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.isResent.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "is_resent[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.originalOrderId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.originalOrderId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "original_order_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for OrderParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static OrderBuilder builder() {
+      return new OrderBuilder();
+    }
+
+    public static final class OrderBuilder {
+
+      private IdParams id;
+
+      private SubscriptionIdParams subscriptionId;
+
+      private CustomerIdParams customerId;
+
+      private StatusParams status;
+
+      private PriceTypeParams priceType;
+
+      private OrderDateParams orderDate;
+
+      private ShippingDateParams shippingDate;
+
+      private ShippedAtParams shippedAt;
+
+      private DeliveredAtParams deliveredAt;
+
+      private CancelledAtParams cancelledAt;
+
+      private AmountPaidParams amountPaid;
+
+      private RefundableCreditsParams refundableCredits;
+
+      private RefundableCreditsIssuedParams refundableCreditsIssued;
+
+      private UpdatedAtParams updatedAt;
+
+      private ResentStatusParams resentStatus;
+
+      private IsResentParams isResent;
+
+      private OriginalOrderIdParams originalOrderId;
+
+      private OrderBuilder() {}
+
+      public OrderBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public OrderBuilder subscriptionId(SubscriptionIdParams value) {
+        this.subscriptionId = value;
+        return this;
+      }
+
+      public OrderBuilder customerId(CustomerIdParams value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public OrderBuilder status(StatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public OrderBuilder priceType(PriceTypeParams value) {
+        this.priceType = value;
+        return this;
+      }
+
+      public OrderBuilder orderDate(OrderDateParams value) {
+        this.orderDate = value;
+        return this;
+      }
+
+      public OrderBuilder shippingDate(ShippingDateParams value) {
+        this.shippingDate = value;
+        return this;
+      }
+
+      public OrderBuilder shippedAt(ShippedAtParams value) {
+        this.shippedAt = value;
+        return this;
+      }
+
+      public OrderBuilder deliveredAt(DeliveredAtParams value) {
+        this.deliveredAt = value;
+        return this;
+      }
+
+      public OrderBuilder cancelledAt(CancelledAtParams value) {
+        this.cancelledAt = value;
+        return this;
+      }
+
+      public OrderBuilder amountPaid(AmountPaidParams value) {
+        this.amountPaid = value;
+        return this;
+      }
+
+      public OrderBuilder refundableCredits(RefundableCreditsParams value) {
+        this.refundableCredits = value;
+        return this;
+      }
+
+      public OrderBuilder refundableCreditsIssued(RefundableCreditsIssuedParams value) {
+        this.refundableCreditsIssued = value;
+        return this;
+      }
+
+      public OrderBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public OrderBuilder resentStatus(ResentStatusParams value) {
+        this.resentStatus = value;
+        return this;
+      }
+
+      public OrderBuilder isResent(IsResentParams value) {
+        this.isResent = value;
+        return this;
+      }
+
+      public OrderBuilder originalOrderId(OriginalOrderIdParams value) {
+        this.originalOrderId = value;
+        return this;
+      }
+
+      public OrderParams build() {
+        return new OrderParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private final String in;
+
+    private final String notIn;
+
+    private SubscriptionIdParams(SubscriptionIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionIdBuilder builder() {
+      return new SubscriptionIdBuilder();
+    }
+
+    public static final class SubscriptionIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private String in;
+
+      private String notIn;
+
+      private SubscriptionIdBuilder() {}
+
+      public SubscriptionIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public SubscriptionIdParams build() {
+        return new SubscriptionIdParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CustomerIdParams(CustomerIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerIdBuilder builder() {
+      return new CustomerIdBuilder();
+    }
+
+    public static final class CustomerIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CustomerIdBuilder() {}
+
+      public CustomerIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CustomerIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CustomerIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CustomerIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CustomerIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CustomerIdParams build() {
+        return new CustomerIdParams(this);
+      }
+    }
+  }
+
+  public static final class StatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private StatusParams(StatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatusBuilder builder() {
+      return new StatusBuilder();
+    }
+
+    public static final class StatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private StatusBuilder() {}
+
+      public StatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public StatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public StatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public StatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public StatusParams build() {
+        return new StatusParams(this);
+      }
+    }
+
+    public enum Is {
+      NEW("new"),
+
+      PROCESSING("processing"),
+
+      COMPLETE("complete"),
+
+      CANCELLED("cancelled"),
+
+      VOIDED("voided"),
+
+      QUEUED("queued"),
+
+      AWAITING_SHIPMENT("awaiting_shipment"),
+
+      ON_HOLD("on_hold"),
+
+      DELIVERED("delivered"),
+
+      SHIPPED("shipped"),
+
+      PARTIALLY_DELIVERED("partially_delivered"),
+
+      RETURNED("returned"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      NEW("new"),
+
+      PROCESSING("processing"),
+
+      COMPLETE("complete"),
+
+      CANCELLED("cancelled"),
+
+      VOIDED("voided"),
+
+      QUEUED("queued"),
+
+      AWAITING_SHIPMENT("awaiting_shipment"),
+
+      ON_HOLD("on_hold"),
+
+      DELIVERED("delivered"),
+
+      SHIPPED("shipped"),
+
+      PARTIALLY_DELIVERED("partially_delivered"),
+
+      RETURNED("returned"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PriceTypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PriceTypeParams(PriceTypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PriceTypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PriceTypeBuilder builder() {
+      return new PriceTypeBuilder();
+    }
+
+    public static final class PriceTypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private PriceTypeBuilder() {}
+
+      public PriceTypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public PriceTypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PriceTypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PriceTypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PriceTypeParams build() {
+        return new PriceTypeParams(this);
+      }
+    }
+
+    public enum Is {
+      TAX_EXCLUSIVE("tax_exclusive"),
+
+      TAX_INCLUSIVE("tax_inclusive"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      TAX_EXCLUSIVE("tax_exclusive"),
+
+      TAX_INCLUSIVE("tax_inclusive"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class OrderDateParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private OrderDateParams(OrderDateBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for OrderDateParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static OrderDateBuilder builder() {
+      return new OrderDateBuilder();
+    }
+
+    public static final class OrderDateBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private OrderDateBuilder() {}
+
+      public OrderDateBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public OrderDateBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public OrderDateBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public OrderDateBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public OrderDateParams build() {
+        return new OrderDateParams(this);
+      }
+    }
+  }
+
+  public static final class ShippingDateParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private ShippingDateParams(ShippingDateBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingDateParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingDateBuilder builder() {
+      return new ShippingDateBuilder();
+    }
+
+    public static final class ShippingDateBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private ShippingDateBuilder() {}
+
+      public ShippingDateBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public ShippingDateBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public ShippingDateBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public ShippingDateBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public ShippingDateParams build() {
+        return new ShippingDateParams(this);
+      }
+    }
+  }
+
+  public static final class ShippedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private ShippedAtParams(ShippedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippedAtBuilder builder() {
+      return new ShippedAtBuilder();
+    }
+
+    public static final class ShippedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private ShippedAtBuilder() {}
+
+      public ShippedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public ShippedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public ShippedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public ShippedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public ShippedAtParams build() {
+        return new ShippedAtParams(this);
+      }
+    }
+  }
+
+  public static final class DeliveredAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private DeliveredAtParams(DeliveredAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DeliveredAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DeliveredAtBuilder builder() {
+      return new DeliveredAtBuilder();
+    }
+
+    public static final class DeliveredAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private DeliveredAtBuilder() {}
+
+      public DeliveredAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public DeliveredAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public DeliveredAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public DeliveredAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public DeliveredAtParams build() {
+        return new DeliveredAtParams(this);
+      }
+    }
+  }
+
+  public static final class CancelledAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private CancelledAtParams(CancelledAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CancelledAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CancelledAtBuilder builder() {
+      return new CancelledAtBuilder();
+    }
+
+    public static final class CancelledAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private CancelledAtBuilder() {}
+
+      public CancelledAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public CancelledAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public CancelledAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public CancelledAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public CancelledAtParams build() {
+        return new CancelledAtParams(this);
+      }
+    }
+  }
+
+  public static final class AmountPaidParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountPaidParams(AmountPaidBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountPaidParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountPaidBuilder builder() {
+      return new AmountPaidBuilder();
+    }
+
+    public static final class AmountPaidBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountPaidBuilder() {}
+
+      public AmountPaidBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountPaidBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountPaidBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountPaidBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountPaidBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountPaidBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountPaidBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountPaidParams build() {
+        return new AmountPaidParams(this);
+      }
+    }
+  }
+
+  public static final class RefundableCreditsParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private RefundableCreditsParams(RefundableCreditsBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for RefundableCreditsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static RefundableCreditsBuilder builder() {
+      return new RefundableCreditsBuilder();
+    }
+
+    public static final class RefundableCreditsBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private RefundableCreditsBuilder() {}
+
+      public RefundableCreditsBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public RefundableCreditsBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public RefundableCreditsBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public RefundableCreditsBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public RefundableCreditsBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public RefundableCreditsBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public RefundableCreditsBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public RefundableCreditsParams build() {
+        return new RefundableCreditsParams(this);
+      }
+    }
+  }
+
+  public static final class RefundableCreditsIssuedParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private RefundableCreditsIssuedParams(RefundableCreditsIssuedBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for RefundableCreditsIssuedParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static RefundableCreditsIssuedBuilder builder() {
+      return new RefundableCreditsIssuedBuilder();
+    }
+
+    public static final class RefundableCreditsIssuedBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private RefundableCreditsIssuedBuilder() {}
+
+      public RefundableCreditsIssuedBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public RefundableCreditsIssuedBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public RefundableCreditsIssuedBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public RefundableCreditsIssuedBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public RefundableCreditsIssuedBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public RefundableCreditsIssuedBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public RefundableCreditsIssuedBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public RefundableCreditsIssuedParams build() {
+        return new RefundableCreditsIssuedParams(this);
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class ResentStatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ResentStatusParams(ResentStatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ResentStatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ResentStatusBuilder builder() {
+      return new ResentStatusBuilder();
+    }
+
+    public static final class ResentStatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ResentStatusBuilder() {}
+
+      public ResentStatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ResentStatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ResentStatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ResentStatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ResentStatusParams build() {
+        return new ResentStatusParams(this);
+      }
+    }
+
+    public enum Is {
+      FULLY_RESENT("fully_resent"),
+
+      PARTIALLY_RESENT("partially_resent"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      FULLY_RESENT("fully_resent"),
+
+      PARTIALLY_RESENT("partially_resent"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class IsResentParams {
+
+    private final Is is;
+
+    private IsResentParams(IsResentBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IsResentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IsResentBuilder builder() {
+      return new IsResentBuilder();
+    }
+
+    public static final class IsResentBuilder {
+
+      private Is is;
+
+      private IsResentBuilder() {}
+
+      public IsResentBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public IsResentParams build() {
+        return new IsResentParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class OriginalOrderIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private OriginalOrderIdParams(OriginalOrderIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for OriginalOrderIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static OriginalOrderIdBuilder builder() {
+      return new OriginalOrderIdBuilder();
+    }
+
+    public static final class OriginalOrderIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private OriginalOrderIdBuilder() {}
+
+      public OriginalOrderIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public OriginalOrderIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public OriginalOrderIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public OriginalOrderIdParams build() {
+        return new OriginalOrderIdParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportPlansParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportPlansParams.java
new file mode 100644
index 00000000..8c9f2c59
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportPlansParams.java
@@ -0,0 +1,2374 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportPlansParams {
+
+  private final CurrencyCodeParams currencyCode;
+
+  private final PlanParams plan;
+
+  private ExportPlansParams(ExportPlansBuilder builder) {
+
+    this.currencyCode = builder.currencyCode;
+
+    this.plan = builder.plan;
+  }
+
+  public CurrencyCodeParams getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public PlanParams getPlan() {
+    return plan;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.currencyCode != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.currencyCode.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "currency_code[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.plan != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.plan.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "plan[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportPlansParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportPlansBuilder builder() {
+    return new ExportPlansBuilder();
+  }
+
+  public static final class ExportPlansBuilder {
+
+    private CurrencyCodeParams currencyCode;
+
+    private PlanParams plan;
+
+    private ExportPlansBuilder() {}
+
+    public ExportPlansBuilder currencyCode(CurrencyCodeParams value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public ExportPlansBuilder plan(PlanParams value) {
+      this.plan = value;
+      return this;
+    }
+
+    public ExportPlansParams build() {
+      return new ExportPlansParams(this);
+    }
+  }
+
+  public static final class CurrencyCodeParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CurrencyCodeParams(CurrencyCodeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CurrencyCodeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CurrencyCodeBuilder builder() {
+      return new CurrencyCodeBuilder();
+    }
+
+    public static final class CurrencyCodeBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CurrencyCodeBuilder() {}
+
+      public CurrencyCodeBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CurrencyCodeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CurrencyCodeParams build() {
+        return new CurrencyCodeParams(this);
+      }
+    }
+  }
+
+  public static final class PlanParams {
+
+    private final IdParams id;
+
+    private final NameParams name;
+
+    private final PriceParams price;
+
+    private final PeriodParams period;
+
+    private final PeriodUnitParams periodUnit;
+
+    private final TrialPeriodParams trialPeriod;
+
+    private final TrialPeriodUnitParams trialPeriodUnit;
+
+    private final AddonApplicabilityParams addonApplicability;
+
+    private final GiftableParams giftable;
+
+    private final StatusParams status;
+
+    private final UpdatedAtParams updatedAt;
+
+    private final ChannelParams channel;
+
+    private PlanParams(PlanBuilder builder) {
+
+      this.id = builder.id;
+
+      this.name = builder.name;
+
+      this.price = builder.price;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.trialPeriod = builder.trialPeriod;
+
+      this.trialPeriodUnit = builder.trialPeriodUnit;
+
+      this.addonApplicability = builder.addonApplicability;
+
+      this.giftable = builder.giftable;
+
+      this.status = builder.status;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.channel = builder.channel;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public NameParams getName() {
+      return name;
+    }
+
+    public PriceParams getPrice() {
+      return price;
+    }
+
+    public PeriodParams getPeriod() {
+      return period;
+    }
+
+    public PeriodUnitParams getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public TrialPeriodParams getTrialPeriod() {
+      return trialPeriod;
+    }
+
+    public TrialPeriodUnitParams getTrialPeriodUnit() {
+      return trialPeriodUnit;
+    }
+
+    public AddonApplicabilityParams getAddonApplicability() {
+      return addonApplicability;
+    }
+
+    public GiftableParams getGiftable() {
+      return giftable;
+    }
+
+    public StatusParams getStatus() {
+      return status;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public ChannelParams getChannel() {
+      return channel;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.name != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.name.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "name[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.price != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.price.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "price[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.period != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.period.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "period[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.periodUnit != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.periodUnit.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "period_unit[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.trialPeriod != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.trialPeriod.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "trial_period[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.trialPeriodUnit != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.trialPeriodUnit.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "trial_period_unit[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.addonApplicability != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.addonApplicability.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "addon_applicability[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.giftable != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.giftable.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "giftable[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PlanParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PlanBuilder builder() {
+      return new PlanBuilder();
+    }
+
+    public static final class PlanBuilder {
+
+      private IdParams id;
+
+      private NameParams name;
+
+      private PriceParams price;
+
+      private PeriodParams period;
+
+      private PeriodUnitParams periodUnit;
+
+      private TrialPeriodParams trialPeriod;
+
+      private TrialPeriodUnitParams trialPeriodUnit;
+
+      private AddonApplicabilityParams addonApplicability;
+
+      private GiftableParams giftable;
+
+      private StatusParams status;
+
+      private UpdatedAtParams updatedAt;
+
+      private ChannelParams channel;
+
+      private PlanBuilder() {}
+
+      public PlanBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public PlanBuilder name(NameParams value) {
+        this.name = value;
+        return this;
+      }
+
+      public PlanBuilder price(PriceParams value) {
+        this.price = value;
+        return this;
+      }
+
+      public PlanBuilder period(PeriodParams value) {
+        this.period = value;
+        return this;
+      }
+
+      public PlanBuilder periodUnit(PeriodUnitParams value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public PlanBuilder trialPeriod(TrialPeriodParams value) {
+        this.trialPeriod = value;
+        return this;
+      }
+
+      public PlanBuilder trialPeriodUnit(TrialPeriodUnitParams value) {
+        this.trialPeriodUnit = value;
+        return this;
+      }
+
+      public PlanBuilder addonApplicability(AddonApplicabilityParams value) {
+        this.addonApplicability = value;
+        return this;
+      }
+
+      public PlanBuilder giftable(GiftableParams value) {
+        this.giftable = value;
+        return this;
+      }
+
+      public PlanBuilder status(StatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public PlanBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public PlanBuilder channel(ChannelParams value) {
+        this.channel = value;
+        return this;
+      }
+
+      public PlanParams build() {
+        return new PlanParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class NameParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private NameParams(NameBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NameParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NameBuilder builder() {
+      return new NameBuilder();
+    }
+
+    public static final class NameBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private NameBuilder() {}
+
+      public NameBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public NameBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public NameBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public NameBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public NameBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public NameParams build() {
+        return new NameParams(this);
+      }
+    }
+  }
+
+  public static final class PriceParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private PriceParams(PriceBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PriceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PriceBuilder builder() {
+      return new PriceBuilder();
+    }
+
+    public static final class PriceBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private PriceBuilder() {}
+
+      public PriceBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PriceBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PriceBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public PriceBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public PriceBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public PriceBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public PriceBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public PriceParams build() {
+        return new PriceParams(this);
+      }
+    }
+  }
+
+  public static final class PeriodParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private PeriodParams(PeriodBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PeriodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PeriodBuilder builder() {
+      return new PeriodBuilder();
+    }
+
+    public static final class PeriodBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private PeriodBuilder() {}
+
+      public PeriodBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PeriodBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PeriodBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public PeriodBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public PeriodBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public PeriodBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public PeriodBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public PeriodParams build() {
+        return new PeriodParams(this);
+      }
+    }
+  }
+
+  public static final class PeriodUnitParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PeriodUnitParams(PeriodUnitBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PeriodUnitParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PeriodUnitBuilder builder() {
+      return new PeriodUnitBuilder();
+    }
+
+    public static final class PeriodUnitBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private PeriodUnitBuilder() {}
+
+      public PeriodUnitBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public PeriodUnitBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PeriodUnitBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PeriodUnitBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PeriodUnitParams build() {
+        return new PeriodUnitParams(this);
+      }
+    }
+
+    public enum Is {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TrialPeriodParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private final IsPresent isPresent;
+
+    private TrialPeriodParams(TrialPeriodBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TrialPeriodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TrialPeriodBuilder builder() {
+      return new TrialPeriodBuilder();
+    }
+
+    public static final class TrialPeriodBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private IsPresent isPresent;
+
+      private TrialPeriodBuilder() {}
+
+      public TrialPeriodBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public TrialPeriodBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TrialPeriodBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public TrialPeriodBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public TrialPeriodBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public TrialPeriodBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public TrialPeriodBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public TrialPeriodBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public TrialPeriodParams build() {
+        return new TrialPeriodParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TrialPeriodUnitParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private TrialPeriodUnitParams(TrialPeriodUnitBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TrialPeriodUnitParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TrialPeriodUnitBuilder builder() {
+      return new TrialPeriodUnitBuilder();
+    }
+
+    public static final class TrialPeriodUnitBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private TrialPeriodUnitBuilder() {}
+
+      public TrialPeriodUnitBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public TrialPeriodUnitBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TrialPeriodUnitBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public TrialPeriodUnitBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public TrialPeriodUnitParams build() {
+        return new TrialPeriodUnitParams(this);
+      }
+    }
+
+    public enum Is {
+      DAY("day"),
+
+      MONTH("month"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      DAY("day"),
+
+      MONTH("month"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonApplicabilityParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private AddonApplicabilityParams(AddonApplicabilityBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonApplicabilityParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonApplicabilityBuilder builder() {
+      return new AddonApplicabilityBuilder();
+    }
+
+    public static final class AddonApplicabilityBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private AddonApplicabilityBuilder() {}
+
+      public AddonApplicabilityBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public AddonApplicabilityBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AddonApplicabilityBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public AddonApplicabilityBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public AddonApplicabilityParams build() {
+        return new AddonApplicabilityParams(this);
+      }
+    }
+
+    public enum Is {
+      ALL("all"),
+
+      RESTRICTED("restricted"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ALL("all"),
+
+      RESTRICTED("restricted"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class GiftableParams {
+
+    private final Is is;
+
+    private GiftableParams(GiftableBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GiftableParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GiftableBuilder builder() {
+      return new GiftableBuilder();
+    }
+
+    public static final class GiftableBuilder {
+
+      private Is is;
+
+      private GiftableBuilder() {}
+
+      public GiftableBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public GiftableParams build() {
+        return new GiftableParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private StatusParams(StatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatusBuilder builder() {
+      return new StatusBuilder();
+    }
+
+    public static final class StatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private StatusBuilder() {}
+
+      public StatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public StatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public StatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public StatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public StatusParams build() {
+        return new StatusParams(this);
+      }
+    }
+
+    public enum Is {
+      ACTIVE("active"),
+
+      ARCHIVED("archived"),
+
+      DELETED("deleted"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ACTIVE("active"),
+
+      ARCHIVED("archived"),
+
+      DELETED("deleted"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class ChannelParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ChannelParams(ChannelBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChannelParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChannelBuilder builder() {
+      return new ChannelBuilder();
+    }
+
+    public static final class ChannelBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ChannelBuilder() {}
+
+      public ChannelBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ChannelBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ChannelBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ChannelBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ChannelParams build() {
+        return new ChannelParams(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportPriceVariantsParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportPriceVariantsParams.java
new file mode 100644
index 00000000..2c7604c9
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportPriceVariantsParams.java
@@ -0,0 +1,1077 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportPriceVariantsParams {
+
+  private final BusinessEntityIdParams businessEntityId;
+
+  private final IncludeSiteLevelResourcesParams includeSiteLevelResources;
+
+  private final PriceVariantParams priceVariant;
+
+  private ExportPriceVariantsParams(ExportPriceVariantsBuilder builder) {
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.includeSiteLevelResources = builder.includeSiteLevelResources;
+
+    this.priceVariant = builder.priceVariant;
+  }
+
+  public BusinessEntityIdParams getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public IncludeSiteLevelResourcesParams getIncludeSiteLevelResources() {
+    return includeSiteLevelResources;
+  }
+
+  public PriceVariantParams getPriceVariant() {
+    return priceVariant;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.businessEntityId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.businessEntityId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "business_entity_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.includeSiteLevelResources != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.includeSiteLevelResources.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "include_site_level_resources[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.priceVariant != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.priceVariant.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "price_variant[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportPriceVariantsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportPriceVariantsBuilder builder() {
+    return new ExportPriceVariantsBuilder();
+  }
+
+  public static final class ExportPriceVariantsBuilder {
+
+    private BusinessEntityIdParams businessEntityId;
+
+    private IncludeSiteLevelResourcesParams includeSiteLevelResources;
+
+    private PriceVariantParams priceVariant;
+
+    private ExportPriceVariantsBuilder() {}
+
+    public ExportPriceVariantsBuilder businessEntityId(BusinessEntityIdParams value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public ExportPriceVariantsBuilder includeSiteLevelResources(
+        IncludeSiteLevelResourcesParams value) {
+      this.includeSiteLevelResources = value;
+      return this;
+    }
+
+    public ExportPriceVariantsBuilder priceVariant(PriceVariantParams value) {
+      this.priceVariant = value;
+      return this;
+    }
+
+    public ExportPriceVariantsParams build() {
+      return new ExportPriceVariantsParams(this);
+    }
+  }
+
+  public static final class BusinessEntityIdParams {
+
+    private final IsPresent isPresent;
+
+    private final String is;
+
+    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
+
+      this.isPresent = builder.isPresent;
+
+      this.is = builder.is;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BusinessEntityIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BusinessEntityIdBuilder builder() {
+      return new BusinessEntityIdBuilder();
+    }
+
+    public static final class BusinessEntityIdBuilder {
+
+      private IsPresent isPresent;
+
+      private String is;
+
+      private BusinessEntityIdBuilder() {}
+
+      public BusinessEntityIdBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public BusinessEntityIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public BusinessEntityIdParams build() {
+        return new BusinessEntityIdParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class IncludeSiteLevelResourcesParams {
+
+    private final Is is;
+
+    private IncludeSiteLevelResourcesParams(IncludeSiteLevelResourcesBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IncludeSiteLevelResourcesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IncludeSiteLevelResourcesBuilder builder() {
+      return new IncludeSiteLevelResourcesBuilder();
+    }
+
+    public static final class IncludeSiteLevelResourcesBuilder {
+
+      private Is is;
+
+      private IncludeSiteLevelResourcesBuilder() {}
+
+      public IncludeSiteLevelResourcesBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public IncludeSiteLevelResourcesParams build() {
+        return new IncludeSiteLevelResourcesParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PriceVariantParams {
+
+    private final IdParams id;
+
+    private final NameParams name;
+
+    private final StatusParams status;
+
+    private final UpdatedAtParams updatedAt;
+
+    private final CreatedAtParams createdAt;
+
+    private PriceVariantParams(PriceVariantBuilder builder) {
+
+      this.id = builder.id;
+
+      this.name = builder.name;
+
+      this.status = builder.status;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.createdAt = builder.createdAt;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public NameParams getName() {
+      return name;
+    }
+
+    public StatusParams getStatus() {
+      return status;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public CreatedAtParams getCreatedAt() {
+      return createdAt;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.name != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.name.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "name[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.createdAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.createdAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "created_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PriceVariantParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PriceVariantBuilder builder() {
+      return new PriceVariantBuilder();
+    }
+
+    public static final class PriceVariantBuilder {
+
+      private IdParams id;
+
+      private NameParams name;
+
+      private StatusParams status;
+
+      private UpdatedAtParams updatedAt;
+
+      private CreatedAtParams createdAt;
+
+      private PriceVariantBuilder() {}
+
+      public PriceVariantBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public PriceVariantBuilder name(NameParams value) {
+        this.name = value;
+        return this;
+      }
+
+      public PriceVariantBuilder status(StatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public PriceVariantBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public PriceVariantBuilder createdAt(CreatedAtParams value) {
+        this.createdAt = value;
+        return this;
+      }
+
+      public PriceVariantParams build() {
+        return new PriceVariantParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class NameParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private NameParams(NameBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NameParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NameBuilder builder() {
+      return new NameBuilder();
+    }
+
+    public static final class NameBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private NameBuilder() {}
+
+      public NameBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public NameBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public NameBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public NameBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public NameBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public NameParams build() {
+        return new NameParams(this);
+      }
+    }
+  }
+
+  public static final class StatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private StatusParams(StatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatusBuilder builder() {
+      return new StatusBuilder();
+    }
+
+    public static final class StatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private StatusBuilder() {}
+
+      public StatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public StatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public StatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public StatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public StatusParams build() {
+        return new StatusParams(this);
+      }
+    }
+
+    public enum Is {
+      ACTIVE("active"),
+
+      ARCHIVED("archived"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ACTIVE("active"),
+
+      ARCHIVED("archived"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class CreatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private CreatedAtParams(CreatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreatedAtBuilder builder() {
+      return new CreatedAtBuilder();
+    }
+
+    public static final class CreatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private CreatedAtBuilder() {}
+
+      public CreatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public CreatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public CreatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public CreatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public CreatedAtParams build() {
+        return new CreatedAtParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/export/params/ExportRetrieveParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/export/params/ExportRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/export/params/ExportRetrieveParams.java
index 2935fe83..325d4488 100644
--- a/src/main/java/com/chargebee/v4/core/models/export/params/ExportRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.export.params;
+package com.chargebee.v4.models.export.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportRevenueRecognitionParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportRevenueRecognitionParams.java
new file mode 100644
index 00000000..dc4994c4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportRevenueRecognitionParams.java
@@ -0,0 +1,8574 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportRevenueRecognitionParams {
+
+  private final ReportBy reportBy;
+
+  private final String currencyCode;
+
+  private final Integer reportFromMonth;
+
+  private final Integer reportFromYear;
+
+  private final Integer reportToMonth;
+
+  private final Integer reportToYear;
+
+  private final Boolean includeDiscounts;
+
+  private final PaymentOwnerParams paymentOwner;
+
+  private final ItemIdParams itemId;
+
+  private final ItemPriceIdParams itemPriceId;
+
+  private final CancelReasonCodeParams cancelReasonCode;
+
+  private final BusinessEntityIdParams businessEntityId;
+
+  private final InvoiceParams invoice;
+
+  private final SubscriptionParams subscription;
+
+  private final CustomerParams customer;
+
+  private final RelationshipParams relationship;
+
+  private ExportRevenueRecognitionParams(ExportRevenueRecognitionBuilder builder) {
+
+    this.reportBy = builder.reportBy;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.reportFromMonth = builder.reportFromMonth;
+
+    this.reportFromYear = builder.reportFromYear;
+
+    this.reportToMonth = builder.reportToMonth;
+
+    this.reportToYear = builder.reportToYear;
+
+    this.includeDiscounts = builder.includeDiscounts;
+
+    this.paymentOwner = builder.paymentOwner;
+
+    this.itemId = builder.itemId;
+
+    this.itemPriceId = builder.itemPriceId;
+
+    this.cancelReasonCode = builder.cancelReasonCode;
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.invoice = builder.invoice;
+
+    this.subscription = builder.subscription;
+
+    this.customer = builder.customer;
+
+    this.relationship = builder.relationship;
+  }
+
+  public ReportBy getReportBy() {
+    return reportBy;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public Integer getReportFromMonth() {
+    return reportFromMonth;
+  }
+
+  public Integer getReportFromYear() {
+    return reportFromYear;
+  }
+
+  public Integer getReportToMonth() {
+    return reportToMonth;
+  }
+
+  public Integer getReportToYear() {
+    return reportToYear;
+  }
+
+  public Boolean getIncludeDiscounts() {
+    return includeDiscounts;
+  }
+
+  public PaymentOwnerParams getPaymentOwner() {
+    return paymentOwner;
+  }
+
+  public ItemIdParams getItemId() {
+    return itemId;
+  }
+
+  public ItemPriceIdParams getItemPriceId() {
+    return itemPriceId;
+  }
+
+  public CancelReasonCodeParams getCancelReasonCode() {
+    return cancelReasonCode;
+  }
+
+  public BusinessEntityIdParams getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public InvoiceParams getInvoice() {
+    return invoice;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public RelationshipParams getRelationship() {
+    return relationship;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.reportBy != null) {
+
+      formData.put("report_by", this.reportBy);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.reportFromMonth != null) {
+
+      formData.put("report_from_month", this.reportFromMonth);
+    }
+
+    if (this.reportFromYear != null) {
+
+      formData.put("report_from_year", this.reportFromYear);
+    }
+
+    if (this.reportToMonth != null) {
+
+      formData.put("report_to_month", this.reportToMonth);
+    }
+
+    if (this.reportToYear != null) {
+
+      formData.put("report_to_year", this.reportToYear);
+    }
+
+    if (this.includeDiscounts != null) {
+
+      formData.put("include_discounts", this.includeDiscounts);
+    }
+
+    if (this.paymentOwner != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentOwner.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_owner[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemPriceId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemPriceId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_price_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.cancelReasonCode != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.cancelReasonCode.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "cancel_reason_code[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.businessEntityId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.businessEntityId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "business_entity_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.invoice != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.invoice.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "invoice[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.relationship != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.relationship.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "relationship[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportRevenueRecognitionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportRevenueRecognitionBuilder builder() {
+    return new ExportRevenueRecognitionBuilder();
+  }
+
+  public static final class ExportRevenueRecognitionBuilder {
+
+    private ReportBy reportBy;
+
+    private String currencyCode;
+
+    private Integer reportFromMonth;
+
+    private Integer reportFromYear;
+
+    private Integer reportToMonth;
+
+    private Integer reportToYear;
+
+    private Boolean includeDiscounts;
+
+    private PaymentOwnerParams paymentOwner;
+
+    private ItemIdParams itemId;
+
+    private ItemPriceIdParams itemPriceId;
+
+    private CancelReasonCodeParams cancelReasonCode;
+
+    private BusinessEntityIdParams businessEntityId;
+
+    private InvoiceParams invoice;
+
+    private SubscriptionParams subscription;
+
+    private CustomerParams customer;
+
+    private RelationshipParams relationship;
+
+    private ExportRevenueRecognitionBuilder() {}
+
+    public ExportRevenueRecognitionBuilder reportBy(ReportBy value) {
+      this.reportBy = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder reportFromMonth(Integer value) {
+      this.reportFromMonth = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder reportFromYear(Integer value) {
+      this.reportFromYear = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder reportToMonth(Integer value) {
+      this.reportToMonth = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder reportToYear(Integer value) {
+      this.reportToYear = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder includeDiscounts(Boolean value) {
+      this.includeDiscounts = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder paymentOwner(PaymentOwnerParams value) {
+      this.paymentOwner = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder itemId(ItemIdParams value) {
+      this.itemId = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder itemPriceId(ItemPriceIdParams value) {
+      this.itemPriceId = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder cancelReasonCode(CancelReasonCodeParams value) {
+      this.cancelReasonCode = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder businessEntityId(BusinessEntityIdParams value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder invoice(InvoiceParams value) {
+      this.invoice = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionBuilder relationship(RelationshipParams value) {
+      this.relationship = value;
+      return this;
+    }
+
+    public ExportRevenueRecognitionParams build() {
+      return new ExportRevenueRecognitionParams(this);
+    }
+  }
+
+  public enum ReportBy {
+    CUSTOMER("customer"),
+
+    INVOICE("invoice"),
+
+    PRODUCT("product"),
+
+    SUBSCRIPTION("subscription"),
+
+    /** An enum member indicating that ReportBy was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ReportBy(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ReportBy fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ReportBy enumValue : ReportBy.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class PaymentOwnerParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PaymentOwnerParams(PaymentOwnerBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentOwnerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentOwnerBuilder builder() {
+      return new PaymentOwnerBuilder();
+    }
+
+    public static final class PaymentOwnerBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private PaymentOwnerBuilder() {}
+
+      public PaymentOwnerBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PaymentOwnerBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PaymentOwnerBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PaymentOwnerBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PaymentOwnerBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PaymentOwnerParams build() {
+        return new PaymentOwnerParams(this);
+      }
+    }
+  }
+
+  public static final class ItemIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemIdParams(ItemIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemIdBuilder builder() {
+      return new ItemIdBuilder();
+    }
+
+    public static final class ItemIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemIdBuilder() {}
+
+      public ItemIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ItemIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemIdParams build() {
+        return new ItemIdParams(this);
+      }
+    }
+  }
+
+  public static final class ItemPriceIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemPriceIdParams(ItemPriceIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemPriceIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemPriceIdBuilder builder() {
+      return new ItemPriceIdBuilder();
+    }
+
+    public static final class ItemPriceIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemPriceIdBuilder() {}
+
+      public ItemPriceIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemPriceIdParams build() {
+        return new ItemPriceIdParams(this);
+      }
+    }
+  }
+
+  public static final class CancelReasonCodeParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CancelReasonCodeParams(CancelReasonCodeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CancelReasonCodeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CancelReasonCodeBuilder builder() {
+      return new CancelReasonCodeBuilder();
+    }
+
+    public static final class CancelReasonCodeBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CancelReasonCodeBuilder() {}
+
+      public CancelReasonCodeBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CancelReasonCodeBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CancelReasonCodeBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CancelReasonCodeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CancelReasonCodeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CancelReasonCodeParams build() {
+        return new CancelReasonCodeParams(this);
+      }
+    }
+  }
+
+  public static final class BusinessEntityIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private BusinessEntityIdParams(BusinessEntityIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BusinessEntityIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BusinessEntityIdBuilder builder() {
+      return new BusinessEntityIdBuilder();
+    }
+
+    public static final class BusinessEntityIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private BusinessEntityIdBuilder() {}
+
+      public BusinessEntityIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public BusinessEntityIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public BusinessEntityIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public BusinessEntityIdParams build() {
+        return new BusinessEntityIdParams(this);
+      }
+    }
+  }
+
+  public static final class InvoiceParams {
+
+    private final IdParams id;
+
+    private final RecurringParams recurring;
+
+    private final StatusParams status;
+
+    private final PriceTypeParams priceType;
+
+    private final DateParams date;
+
+    private final PaidAtParams paidAt;
+
+    private final TotalParams total;
+
+    private final AmountPaidParams amountPaid;
+
+    private final AmountAdjustedParams amountAdjusted;
+
+    private final CreditsAppliedParams creditsApplied;
+
+    private final AmountDueParams amountDue;
+
+    private final DunningStatusParams dunningStatus;
+
+    private final UpdatedAtParams updatedAt;
+
+    private final ChannelParams channel;
+
+    private InvoiceParams(InvoiceBuilder builder) {
+
+      this.id = builder.id;
+
+      this.recurring = builder.recurring;
+
+      this.status = builder.status;
+
+      this.priceType = builder.priceType;
+
+      this.date = builder.date;
+
+      this.paidAt = builder.paidAt;
+
+      this.total = builder.total;
+
+      this.amountPaid = builder.amountPaid;
+
+      this.amountAdjusted = builder.amountAdjusted;
+
+      this.creditsApplied = builder.creditsApplied;
+
+      this.amountDue = builder.amountDue;
+
+      this.dunningStatus = builder.dunningStatus;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.channel = builder.channel;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public RecurringParams getRecurring() {
+      return recurring;
+    }
+
+    public StatusParams getStatus() {
+      return status;
+    }
+
+    public PriceTypeParams getPriceType() {
+      return priceType;
+    }
+
+    public DateParams getDate() {
+      return date;
+    }
+
+    public PaidAtParams getPaidAt() {
+      return paidAt;
+    }
+
+    public TotalParams getTotal() {
+      return total;
+    }
+
+    public AmountPaidParams getAmountPaid() {
+      return amountPaid;
+    }
+
+    public AmountAdjustedParams getAmountAdjusted() {
+      return amountAdjusted;
+    }
+
+    public CreditsAppliedParams getCreditsApplied() {
+      return creditsApplied;
+    }
+
+    public AmountDueParams getAmountDue() {
+      return amountDue;
+    }
+
+    public DunningStatusParams getDunningStatus() {
+      return dunningStatus;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public ChannelParams getChannel() {
+      return channel;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.recurring != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.recurring.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "recurring[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.priceType != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.priceType.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "price_type[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.date != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.date.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "date[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.paidAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.paidAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "paid_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.total != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.total.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "total[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountPaid != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountPaid.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_paid[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountAdjusted != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountAdjusted.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_adjusted[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.creditsApplied != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.creditsApplied.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "credits_applied[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountDue != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountDue.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_due[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.dunningStatus != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.dunningStatus.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "dunning_status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceBuilder builder() {
+      return new InvoiceBuilder();
+    }
+
+    public static final class InvoiceBuilder {
+
+      private IdParams id;
+
+      private RecurringParams recurring;
+
+      private StatusParams status;
+
+      private PriceTypeParams priceType;
+
+      private DateParams date;
+
+      private PaidAtParams paidAt;
+
+      private TotalParams total;
+
+      private AmountPaidParams amountPaid;
+
+      private AmountAdjustedParams amountAdjusted;
+
+      private CreditsAppliedParams creditsApplied;
+
+      private AmountDueParams amountDue;
+
+      private DunningStatusParams dunningStatus;
+
+      private UpdatedAtParams updatedAt;
+
+      private ChannelParams channel;
+
+      private InvoiceBuilder() {}
+
+      public InvoiceBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public InvoiceBuilder recurring(RecurringParams value) {
+        this.recurring = value;
+        return this;
+      }
+
+      public InvoiceBuilder status(StatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public InvoiceBuilder priceType(PriceTypeParams value) {
+        this.priceType = value;
+        return this;
+      }
+
+      public InvoiceBuilder date(DateParams value) {
+        this.date = value;
+        return this;
+      }
+
+      public InvoiceBuilder paidAt(PaidAtParams value) {
+        this.paidAt = value;
+        return this;
+      }
+
+      public InvoiceBuilder total(TotalParams value) {
+        this.total = value;
+        return this;
+      }
+
+      public InvoiceBuilder amountPaid(AmountPaidParams value) {
+        this.amountPaid = value;
+        return this;
+      }
+
+      public InvoiceBuilder amountAdjusted(AmountAdjustedParams value) {
+        this.amountAdjusted = value;
+        return this;
+      }
+
+      public InvoiceBuilder creditsApplied(CreditsAppliedParams value) {
+        this.creditsApplied = value;
+        return this;
+      }
+
+      public InvoiceBuilder amountDue(AmountDueParams value) {
+        this.amountDue = value;
+        return this;
+      }
+
+      public InvoiceBuilder dunningStatus(DunningStatusParams value) {
+        this.dunningStatus = value;
+        return this;
+      }
+
+      public InvoiceBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public InvoiceBuilder channel(ChannelParams value) {
+        this.channel = value;
+        return this;
+      }
+
+      public InvoiceParams build() {
+        return new InvoiceParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class RecurringParams {
+
+    private final Is is;
+
+    private RecurringParams(RecurringBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for RecurringParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static RecurringBuilder builder() {
+      return new RecurringBuilder();
+    }
+
+    public static final class RecurringBuilder {
+
+      private Is is;
+
+      private RecurringBuilder() {}
+
+      public RecurringBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public RecurringParams build() {
+        return new RecurringParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private StatusParams(StatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatusBuilder builder() {
+      return new StatusBuilder();
+    }
+
+    public static final class StatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private StatusBuilder() {}
+
+      public StatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public StatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public StatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public StatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public StatusParams build() {
+        return new StatusParams(this);
+      }
+    }
+
+    public enum Is {
+      PAID("paid"),
+
+      POSTED("posted"),
+
+      PAYMENT_DUE("payment_due"),
+
+      NOT_PAID("not_paid"),
+
+      VOIDED("voided"),
+
+      PENDING("pending"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      PAID("paid"),
+
+      POSTED("posted"),
+
+      PAYMENT_DUE("payment_due"),
+
+      NOT_PAID("not_paid"),
+
+      VOIDED("voided"),
+
+      PENDING("pending"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PriceTypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PriceTypeParams(PriceTypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PriceTypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PriceTypeBuilder builder() {
+      return new PriceTypeBuilder();
+    }
+
+    public static final class PriceTypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private PriceTypeBuilder() {}
+
+      public PriceTypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public PriceTypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PriceTypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PriceTypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PriceTypeParams build() {
+        return new PriceTypeParams(this);
+      }
+    }
+
+    public enum Is {
+      TAX_EXCLUSIVE("tax_exclusive"),
+
+      TAX_INCLUSIVE("tax_inclusive"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      TAX_EXCLUSIVE("tax_exclusive"),
+
+      TAX_INCLUSIVE("tax_inclusive"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DateParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private DateParams(DateBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DateParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DateBuilder builder() {
+      return new DateBuilder();
+    }
+
+    public static final class DateBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private DateBuilder() {}
+
+      public DateBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public DateBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public DateBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public DateBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public DateParams build() {
+        return new DateParams(this);
+      }
+    }
+  }
+
+  public static final class PaidAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private PaidAtParams(PaidAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaidAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaidAtBuilder builder() {
+      return new PaidAtBuilder();
+    }
+
+    public static final class PaidAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private PaidAtBuilder() {}
+
+      public PaidAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public PaidAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public PaidAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public PaidAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public PaidAtParams build() {
+        return new PaidAtParams(this);
+      }
+    }
+  }
+
+  public static final class TotalParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private TotalParams(TotalBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TotalParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TotalBuilder builder() {
+      return new TotalBuilder();
+    }
+
+    public static final class TotalBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private TotalBuilder() {}
+
+      public TotalBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public TotalBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TotalBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public TotalBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public TotalBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public TotalBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public TotalBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public TotalParams build() {
+        return new TotalParams(this);
+      }
+    }
+  }
+
+  public static final class AmountPaidParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountPaidParams(AmountPaidBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountPaidParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountPaidBuilder builder() {
+      return new AmountPaidBuilder();
+    }
+
+    public static final class AmountPaidBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountPaidBuilder() {}
+
+      public AmountPaidBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountPaidBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountPaidBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountPaidBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountPaidBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountPaidBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountPaidBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountPaidParams build() {
+        return new AmountPaidParams(this);
+      }
+    }
+  }
+
+  public static final class AmountAdjustedParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountAdjustedParams(AmountAdjustedBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountAdjustedParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountAdjustedBuilder builder() {
+      return new AmountAdjustedBuilder();
+    }
+
+    public static final class AmountAdjustedBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountAdjustedBuilder() {}
+
+      public AmountAdjustedBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountAdjustedBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountAdjustedParams build() {
+        return new AmountAdjustedParams(this);
+      }
+    }
+  }
+
+  public static final class CreditsAppliedParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private CreditsAppliedParams(CreditsAppliedBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreditsAppliedParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreditsAppliedBuilder builder() {
+      return new CreditsAppliedBuilder();
+    }
+
+    public static final class CreditsAppliedBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private CreditsAppliedBuilder() {}
+
+      public CreditsAppliedBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public CreditsAppliedBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public CreditsAppliedParams build() {
+        return new CreditsAppliedParams(this);
+      }
+    }
+  }
+
+  public static final class AmountDueParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountDueParams(AmountDueBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountDueParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountDueBuilder builder() {
+      return new AmountDueBuilder();
+    }
+
+    public static final class AmountDueBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountDueBuilder() {}
+
+      public AmountDueBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountDueBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountDueBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountDueBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountDueBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountDueBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountDueBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountDueParams build() {
+        return new AmountDueParams(this);
+      }
+    }
+  }
+
+  public static final class DunningStatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private final IsPresent isPresent;
+
+    private DunningStatusParams(DunningStatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DunningStatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DunningStatusBuilder builder() {
+      return new DunningStatusBuilder();
+    }
+
+    public static final class DunningStatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private IsPresent isPresent;
+
+      private DunningStatusBuilder() {}
+
+      public DunningStatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public DunningStatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public DunningStatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public DunningStatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public DunningStatusBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public DunningStatusParams build() {
+        return new DunningStatusParams(this);
+      }
+    }
+
+    public enum Is {
+      IN_PROGRESS("in_progress"),
+
+      EXHAUSTED("exhausted"),
+
+      STOPPED("stopped"),
+
+      SUCCESS("success"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      IN_PROGRESS("in_progress"),
+
+      EXHAUSTED("exhausted"),
+
+      STOPPED("stopped"),
+
+      SUCCESS("success"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class ChannelParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ChannelParams(ChannelBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChannelParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChannelBuilder builder() {
+      return new ChannelBuilder();
+    }
+
+    public static final class ChannelBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ChannelBuilder() {}
+
+      public ChannelBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ChannelBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ChannelBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ChannelBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ChannelParams build() {
+        return new ChannelParams(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final ExportIdParams id;
+
+    private final CustomerIdParams customerId;
+
+    private final ExportStatusParams status;
+
+    private final CancelReasonParams cancelReason;
+
+    private final RemainingBillingCyclesParams remainingBillingCycles;
+
+    private final CreatedAtParams createdAt;
+
+    private final ActivatedAtParams activatedAt;
+
+    private final NextBillingAtParams nextBillingAt;
+
+    private final CancelledAtParams cancelledAt;
+
+    private final HasScheduledChangesParams hasScheduledChanges;
+
+    private final ExportUpdatedAtParams updatedAt;
+
+    private final OfflinePaymentMethodParams offlinePaymentMethod;
+
+    private final AutoCloseInvoicesParams autoCloseInvoices;
+
+    private final ExportChannelParams channel;
+
+    private final PlanIdParams planId;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.customerId = builder.customerId;
+
+      this.status = builder.status;
+
+      this.cancelReason = builder.cancelReason;
+
+      this.remainingBillingCycles = builder.remainingBillingCycles;
+
+      this.createdAt = builder.createdAt;
+
+      this.activatedAt = builder.activatedAt;
+
+      this.nextBillingAt = builder.nextBillingAt;
+
+      this.cancelledAt = builder.cancelledAt;
+
+      this.hasScheduledChanges = builder.hasScheduledChanges;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.autoCloseInvoices = builder.autoCloseInvoices;
+
+      this.channel = builder.channel;
+
+      this.planId = builder.planId;
+    }
+
+    public ExportIdParams getId() {
+      return id;
+    }
+
+    public CustomerIdParams getCustomerId() {
+      return customerId;
+    }
+
+    public ExportStatusParams getStatus() {
+      return status;
+    }
+
+    public CancelReasonParams getCancelReason() {
+      return cancelReason;
+    }
+
+    public RemainingBillingCyclesParams getRemainingBillingCycles() {
+      return remainingBillingCycles;
+    }
+
+    public CreatedAtParams getCreatedAt() {
+      return createdAt;
+    }
+
+    public ActivatedAtParams getActivatedAt() {
+      return activatedAt;
+    }
+
+    public NextBillingAtParams getNextBillingAt() {
+      return nextBillingAt;
+    }
+
+    public CancelledAtParams getCancelledAt() {
+      return cancelledAt;
+    }
+
+    public HasScheduledChangesParams getHasScheduledChanges() {
+      return hasScheduledChanges;
+    }
+
+    public ExportUpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public OfflinePaymentMethodParams getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public AutoCloseInvoicesParams getAutoCloseInvoices() {
+      return autoCloseInvoices;
+    }
+
+    public ExportChannelParams getChannel() {
+      return channel;
+    }
+
+    public PlanIdParams getPlanId() {
+      return planId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.customerId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.customerId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "customer_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.cancelReason != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.cancelReason.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "cancel_reason[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.remainingBillingCycles != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.remainingBillingCycles.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "remaining_billing_cycles[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.createdAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.createdAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "created_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.activatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.activatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "activated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.nextBillingAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.nextBillingAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "next_billing_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.cancelledAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.cancelledAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "cancelled_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.hasScheduledChanges != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.hasScheduledChanges.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "has_scheduled_changes[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.offlinePaymentMethod.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "offline_payment_method[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.autoCloseInvoices != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.autoCloseInvoices.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "auto_close_invoices[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.planId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.planId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "plan_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private ExportIdParams id;
+
+      private CustomerIdParams customerId;
+
+      private ExportStatusParams status;
+
+      private CancelReasonParams cancelReason;
+
+      private RemainingBillingCyclesParams remainingBillingCycles;
+
+      private CreatedAtParams createdAt;
+
+      private ActivatedAtParams activatedAt;
+
+      private NextBillingAtParams nextBillingAt;
+
+      private CancelledAtParams cancelledAt;
+
+      private HasScheduledChangesParams hasScheduledChanges;
+
+      private ExportUpdatedAtParams updatedAt;
+
+      private OfflinePaymentMethodParams offlinePaymentMethod;
+
+      private AutoCloseInvoicesParams autoCloseInvoices;
+
+      private ExportChannelParams channel;
+
+      private PlanIdParams planId;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(ExportIdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder customerId(CustomerIdParams value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder status(ExportStatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public SubscriptionBuilder cancelReason(CancelReasonParams value) {
+        this.cancelReason = value;
+        return this;
+      }
+
+      public SubscriptionBuilder remainingBillingCycles(RemainingBillingCyclesParams value) {
+        this.remainingBillingCycles = value;
+        return this;
+      }
+
+      public SubscriptionBuilder createdAt(CreatedAtParams value) {
+        this.createdAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder activatedAt(ActivatedAtParams value) {
+        this.activatedAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder nextBillingAt(NextBillingAtParams value) {
+        this.nextBillingAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder cancelledAt(CancelledAtParams value) {
+        this.cancelledAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder hasScheduledChanges(HasScheduledChangesParams value) {
+        this.hasScheduledChanges = value;
+        return this;
+      }
+
+      public SubscriptionBuilder updatedAt(ExportUpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethodParams value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCloseInvoices(AutoCloseInvoicesParams value) {
+        this.autoCloseInvoices = value;
+        return this;
+      }
+
+      public SubscriptionBuilder channel(ExportChannelParams value) {
+        this.channel = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planId(PlanIdParams value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+  }
+
+  public static final class ExportIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ExportIdParams(ExportIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportIdBuilder builder() {
+      return new ExportIdBuilder();
+    }
+
+    public static final class ExportIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ExportIdBuilder() {}
+
+      public ExportIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ExportIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ExportIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ExportIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ExportIdParams build() {
+        return new ExportIdParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CustomerIdParams(CustomerIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerIdBuilder builder() {
+      return new CustomerIdBuilder();
+    }
+
+    public static final class CustomerIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CustomerIdBuilder() {}
+
+      public CustomerIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CustomerIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CustomerIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CustomerIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CustomerIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CustomerIdParams build() {
+        return new CustomerIdParams(this);
+      }
+    }
+  }
+
+  public static final class ExportStatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ExportStatusParams(ExportStatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportStatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportStatusBuilder builder() {
+      return new ExportStatusBuilder();
+    }
+
+    public static final class ExportStatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ExportStatusBuilder() {}
+
+      public ExportStatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportStatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ExportStatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ExportStatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ExportStatusParams build() {
+        return new ExportStatusParams(this);
+      }
+    }
+
+    public enum Is {
+      FUTURE("future"),
+
+      IN_TRIAL("in_trial"),
+
+      ACTIVE("active"),
+
+      NON_RENEWING("non_renewing"),
+
+      PAUSED("paused"),
+
+      CANCELLED("cancelled"),
+
+      TRANSFERRED("transferred"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      FUTURE("future"),
+
+      IN_TRIAL("in_trial"),
+
+      ACTIVE("active"),
+
+      NON_RENEWING("non_renewing"),
+
+      PAUSED("paused"),
+
+      CANCELLED("cancelled"),
+
+      TRANSFERRED("transferred"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CancelReasonParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private final IsPresent isPresent;
+
+    private CancelReasonParams(CancelReasonBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CancelReasonParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CancelReasonBuilder builder() {
+      return new CancelReasonBuilder();
+    }
+
+    public static final class CancelReasonBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private IsPresent isPresent;
+
+      private CancelReasonBuilder() {}
+
+      public CancelReasonBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public CancelReasonBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CancelReasonBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CancelReasonBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CancelReasonBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public CancelReasonParams build() {
+        return new CancelReasonParams(this);
+      }
+    }
+
+    public enum Is {
+      NOT_PAID("not_paid"),
+
+      NO_CARD("no_card"),
+
+      FRAUD_REVIEW_FAILED("fraud_review_failed"),
+
+      NON_COMPLIANT_EU_CUSTOMER("non_compliant_eu_customer"),
+
+      TAX_CALCULATION_FAILED("tax_calculation_failed"),
+
+      CURRENCY_INCOMPATIBLE_WITH_GATEWAY("currency_incompatible_with_gateway"),
+
+      NON_COMPLIANT_CUSTOMER("non_compliant_customer"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      NOT_PAID("not_paid"),
+
+      NO_CARD("no_card"),
+
+      FRAUD_REVIEW_FAILED("fraud_review_failed"),
+
+      NON_COMPLIANT_EU_CUSTOMER("non_compliant_eu_customer"),
+
+      TAX_CALCULATION_FAILED("tax_calculation_failed"),
+
+      CURRENCY_INCOMPATIBLE_WITH_GATEWAY("currency_incompatible_with_gateway"),
+
+      NON_COMPLIANT_CUSTOMER("non_compliant_customer"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class RemainingBillingCyclesParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private final IsPresent isPresent;
+
+    private RemainingBillingCyclesParams(RemainingBillingCyclesBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for RemainingBillingCyclesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static RemainingBillingCyclesBuilder builder() {
+      return new RemainingBillingCyclesBuilder();
+    }
+
+    public static final class RemainingBillingCyclesBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private IsPresent isPresent;
+
+      private RemainingBillingCyclesBuilder() {}
+
+      public RemainingBillingCyclesBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesParams build() {
+        return new RemainingBillingCyclesParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CreatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private CreatedAtParams(CreatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreatedAtBuilder builder() {
+      return new CreatedAtBuilder();
+    }
+
+    public static final class CreatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private CreatedAtBuilder() {}
+
+      public CreatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public CreatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public CreatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public CreatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public CreatedAtParams build() {
+        return new CreatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class ActivatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private final IsPresent isPresent;
+
+    private ActivatedAtParams(ActivatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ActivatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ActivatedAtBuilder builder() {
+      return new ActivatedAtBuilder();
+    }
+
+    public static final class ActivatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private IsPresent isPresent;
+
+      private ActivatedAtBuilder() {}
+
+      public ActivatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public ActivatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public ActivatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public ActivatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public ActivatedAtBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public ActivatedAtParams build() {
+        return new ActivatedAtParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class NextBillingAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private NextBillingAtParams(NextBillingAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NextBillingAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NextBillingAtBuilder builder() {
+      return new NextBillingAtBuilder();
+    }
+
+    public static final class NextBillingAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private NextBillingAtBuilder() {}
+
+      public NextBillingAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public NextBillingAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public NextBillingAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public NextBillingAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public NextBillingAtParams build() {
+        return new NextBillingAtParams(this);
+      }
+    }
+  }
+
+  public static final class CancelledAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private CancelledAtParams(CancelledAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CancelledAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CancelledAtBuilder builder() {
+      return new CancelledAtBuilder();
+    }
+
+    public static final class CancelledAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private CancelledAtBuilder() {}
+
+      public CancelledAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public CancelledAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public CancelledAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public CancelledAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public CancelledAtParams build() {
+        return new CancelledAtParams(this);
+      }
+    }
+  }
+
+  public static final class HasScheduledChangesParams {
+
+    private final Is is;
+
+    private HasScheduledChangesParams(HasScheduledChangesBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for HasScheduledChangesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static HasScheduledChangesBuilder builder() {
+      return new HasScheduledChangesBuilder();
+    }
+
+    public static final class HasScheduledChangesBuilder {
+
+      private Is is;
+
+      private HasScheduledChangesBuilder() {}
+
+      public HasScheduledChangesBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public HasScheduledChangesParams build() {
+        return new HasScheduledChangesParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ExportUpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private ExportUpdatedAtParams(ExportUpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportUpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportUpdatedAtBuilder builder() {
+      return new ExportUpdatedAtBuilder();
+    }
+
+    public static final class ExportUpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private ExportUpdatedAtBuilder() {}
+
+      public ExportUpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public ExportUpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public ExportUpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public ExportUpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public ExportUpdatedAtParams build() {
+        return new ExportUpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class OfflinePaymentMethodParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private OfflinePaymentMethodParams(OfflinePaymentMethodBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for OfflinePaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static OfflinePaymentMethodBuilder builder() {
+      return new OfflinePaymentMethodBuilder();
+    }
+
+    public static final class OfflinePaymentMethodBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private OfflinePaymentMethodBuilder() {}
+
+      public OfflinePaymentMethodBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodParams build() {
+        return new OfflinePaymentMethodParams(this);
+      }
+    }
+
+    public enum Is {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AutoCloseInvoicesParams {
+
+    private final Is is;
+
+    private AutoCloseInvoicesParams(AutoCloseInvoicesBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AutoCloseInvoicesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AutoCloseInvoicesBuilder builder() {
+      return new AutoCloseInvoicesBuilder();
+    }
+
+    public static final class AutoCloseInvoicesBuilder {
+
+      private Is is;
+
+      private AutoCloseInvoicesBuilder() {}
+
+      public AutoCloseInvoicesBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public AutoCloseInvoicesParams build() {
+        return new AutoCloseInvoicesParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ExportChannelParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ExportChannelParams(ExportChannelBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportChannelParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportChannelBuilder builder() {
+      return new ExportChannelBuilder();
+    }
+
+    public static final class ExportChannelBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ExportChannelBuilder() {}
+
+      public ExportChannelBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportChannelBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ExportChannelBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ExportChannelBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ExportChannelParams build() {
+        return new ExportChannelParams(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PlanIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PlanIdParams(PlanIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PlanIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PlanIdBuilder builder() {
+      return new PlanIdBuilder();
+    }
+
+    public static final class PlanIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private PlanIdBuilder() {}
+
+      public PlanIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PlanIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PlanIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PlanIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PlanIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PlanIdParams build() {
+        return new PlanIdParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final ExportId2Params id;
+
+    private final FirstNameParams firstName;
+
+    private final LastNameParams lastName;
+
+    private final EmailParams email;
+
+    private final CompanyParams company;
+
+    private final PhoneParams phone;
+
+    private final AutoCollectionParams autoCollection;
+
+    private final TaxabilityParams taxability;
+
+    private final ExportCreatedAtParams createdAt;
+
+    private final ExportUpdatedAt2Params updatedAt;
+
+    private final ExportOfflinePaymentMethodParams offlinePaymentMethod;
+
+    private final ExportAutoCloseInvoicesParams autoCloseInvoices;
+
+    private final ExportChannel2Params channel;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.taxability = builder.taxability;
+
+      this.createdAt = builder.createdAt;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.autoCloseInvoices = builder.autoCloseInvoices;
+
+      this.channel = builder.channel;
+    }
+
+    public ExportId2Params getId() {
+      return id;
+    }
+
+    public FirstNameParams getFirstName() {
+      return firstName;
+    }
+
+    public LastNameParams getLastName() {
+      return lastName;
+    }
+
+    public EmailParams getEmail() {
+      return email;
+    }
+
+    public CompanyParams getCompany() {
+      return company;
+    }
+
+    public PhoneParams getPhone() {
+      return phone;
+    }
+
+    public AutoCollectionParams getAutoCollection() {
+      return autoCollection;
+    }
+
+    public TaxabilityParams getTaxability() {
+      return taxability;
+    }
+
+    public ExportCreatedAtParams getCreatedAt() {
+      return createdAt;
+    }
+
+    public ExportUpdatedAt2Params getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public ExportOfflinePaymentMethodParams getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public ExportAutoCloseInvoicesParams getAutoCloseInvoices() {
+      return autoCloseInvoices;
+    }
+
+    public ExportChannel2Params getChannel() {
+      return channel;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.firstName != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.firstName.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "first_name[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.lastName != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.lastName.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "last_name[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.email != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.email.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "email[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.company != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.company.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "company[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.phone != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.phone.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "phone[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.autoCollection != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.autoCollection.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "auto_collection[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.taxability != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.taxability.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "taxability[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.createdAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.createdAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "created_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.offlinePaymentMethod.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "offline_payment_method[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.autoCloseInvoices != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.autoCloseInvoices.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "auto_close_invoices[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private ExportId2Params id;
+
+      private FirstNameParams firstName;
+
+      private LastNameParams lastName;
+
+      private EmailParams email;
+
+      private CompanyParams company;
+
+      private PhoneParams phone;
+
+      private AutoCollectionParams autoCollection;
+
+      private TaxabilityParams taxability;
+
+      private ExportCreatedAtParams createdAt;
+
+      private ExportUpdatedAt2Params updatedAt;
+
+      private ExportOfflinePaymentMethodParams offlinePaymentMethod;
+
+      private ExportAutoCloseInvoicesParams autoCloseInvoices;
+
+      private ExportChannel2Params channel;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(ExportId2Params value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder firstName(FirstNameParams value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CustomerBuilder lastName(LastNameParams value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CustomerBuilder email(EmailParams value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerBuilder company(CompanyParams value) {
+        this.company = value;
+        return this;
+      }
+
+      public CustomerBuilder phone(PhoneParams value) {
+        this.phone = value;
+        return this;
+      }
+
+      public CustomerBuilder autoCollection(AutoCollectionParams value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public CustomerBuilder taxability(TaxabilityParams value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerBuilder createdAt(ExportCreatedAtParams value) {
+        this.createdAt = value;
+        return this;
+      }
+
+      public CustomerBuilder updatedAt(ExportUpdatedAt2Params value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public CustomerBuilder offlinePaymentMethod(ExportOfflinePaymentMethodParams value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public CustomerBuilder autoCloseInvoices(ExportAutoCloseInvoicesParams value) {
+        this.autoCloseInvoices = value;
+        return this;
+      }
+
+      public CustomerBuilder channel(ExportChannel2Params value) {
+        this.channel = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class ExportId2Params {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ExportId2Params(ExportId2Builder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportId2Params. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportId2Builder builder() {
+      return new ExportId2Builder();
+    }
+
+    public static final class ExportId2Builder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ExportId2Builder() {}
+
+      public ExportId2Builder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportId2Builder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ExportId2Builder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ExportId2Builder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ExportId2Builder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ExportId2Params build() {
+        return new ExportId2Params(this);
+      }
+    }
+  }
+
+  public static final class FirstNameParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private FirstNameParams(FirstNameBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for FirstNameParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static FirstNameBuilder builder() {
+      return new FirstNameBuilder();
+    }
+
+    public static final class FirstNameBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private FirstNameBuilder() {}
+
+      public FirstNameBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public FirstNameBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public FirstNameBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public FirstNameBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public FirstNameParams build() {
+        return new FirstNameParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class LastNameParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private LastNameParams(LastNameBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LastNameParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LastNameBuilder builder() {
+      return new LastNameBuilder();
+    }
+
+    public static final class LastNameBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private LastNameBuilder() {}
+
+      public LastNameBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public LastNameBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public LastNameBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public LastNameBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public LastNameParams build() {
+        return new LastNameParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class EmailParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private EmailParams(EmailBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EmailParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EmailBuilder builder() {
+      return new EmailBuilder();
+    }
+
+    public static final class EmailBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private EmailBuilder() {}
+
+      public EmailBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public EmailBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public EmailBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public EmailBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public EmailParams build() {
+        return new EmailParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CompanyParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private CompanyParams(CompanyBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CompanyParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CompanyBuilder builder() {
+      return new CompanyBuilder();
+    }
+
+    public static final class CompanyBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private CompanyBuilder() {}
+
+      public CompanyBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CompanyBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CompanyBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CompanyBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public CompanyParams build() {
+        return new CompanyParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PhoneParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private PhoneParams(PhoneBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PhoneParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PhoneBuilder builder() {
+      return new PhoneBuilder();
+    }
+
+    public static final class PhoneBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private PhoneBuilder() {}
+
+      public PhoneBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PhoneBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PhoneBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PhoneBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public PhoneParams build() {
+        return new PhoneParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AutoCollectionParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private AutoCollectionParams(AutoCollectionBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AutoCollectionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AutoCollectionBuilder builder() {
+      return new AutoCollectionBuilder();
+    }
+
+    public static final class AutoCollectionBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private AutoCollectionBuilder() {}
+
+      public AutoCollectionBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public AutoCollectionBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AutoCollectionBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public AutoCollectionBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public AutoCollectionParams build() {
+        return new AutoCollectionParams(this);
+      }
+    }
+
+    public enum Is {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxabilityParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private TaxabilityParams(TaxabilityBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxabilityParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxabilityBuilder builder() {
+      return new TaxabilityBuilder();
+    }
+
+    public static final class TaxabilityBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private TaxabilityBuilder() {}
+
+      public TaxabilityBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public TaxabilityBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TaxabilityBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public TaxabilityBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public TaxabilityParams build() {
+        return new TaxabilityParams(this);
+      }
+    }
+
+    public enum Is {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ExportCreatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private ExportCreatedAtParams(ExportCreatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportCreatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportCreatedAtBuilder builder() {
+      return new ExportCreatedAtBuilder();
+    }
+
+    public static final class ExportCreatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private ExportCreatedAtBuilder() {}
+
+      public ExportCreatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public ExportCreatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public ExportCreatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public ExportCreatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public ExportCreatedAtParams build() {
+        return new ExportCreatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class ExportUpdatedAt2Params {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private ExportUpdatedAt2Params(ExportUpdatedAt2Builder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportUpdatedAt2Params. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportUpdatedAt2Builder builder() {
+      return new ExportUpdatedAt2Builder();
+    }
+
+    public static final class ExportUpdatedAt2Builder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private ExportUpdatedAt2Builder() {}
+
+      public ExportUpdatedAt2Builder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public ExportUpdatedAt2Builder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public ExportUpdatedAt2Builder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public ExportUpdatedAt2Builder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public ExportUpdatedAt2Params build() {
+        return new ExportUpdatedAt2Params(this);
+      }
+    }
+  }
+
+  public static final class ExportOfflinePaymentMethodParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ExportOfflinePaymentMethodParams(ExportOfflinePaymentMethodBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportOfflinePaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportOfflinePaymentMethodBuilder builder() {
+      return new ExportOfflinePaymentMethodBuilder();
+    }
+
+    public static final class ExportOfflinePaymentMethodBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ExportOfflinePaymentMethodBuilder() {}
+
+      public ExportOfflinePaymentMethodBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportOfflinePaymentMethodBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ExportOfflinePaymentMethodBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ExportOfflinePaymentMethodBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ExportOfflinePaymentMethodParams build() {
+        return new ExportOfflinePaymentMethodParams(this);
+      }
+    }
+
+    public enum Is {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ExportAutoCloseInvoicesParams {
+
+    private final Is is;
+
+    private ExportAutoCloseInvoicesParams(ExportAutoCloseInvoicesBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportAutoCloseInvoicesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportAutoCloseInvoicesBuilder builder() {
+      return new ExportAutoCloseInvoicesBuilder();
+    }
+
+    public static final class ExportAutoCloseInvoicesBuilder {
+
+      private Is is;
+
+      private ExportAutoCloseInvoicesBuilder() {}
+
+      public ExportAutoCloseInvoicesBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportAutoCloseInvoicesParams build() {
+        return new ExportAutoCloseInvoicesParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ExportChannel2Params {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ExportChannel2Params(ExportChannel2Builder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ExportChannel2Params. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ExportChannel2Builder builder() {
+      return new ExportChannel2Builder();
+    }
+
+    public static final class ExportChannel2Builder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ExportChannel2Builder() {}
+
+      public ExportChannel2Builder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ExportChannel2Builder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ExportChannel2Builder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ExportChannel2Builder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ExportChannel2Params build() {
+        return new ExportChannel2Params(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class RelationshipParams {
+
+    private final ParentIdParams parentId;
+
+    private final PaymentOwnerIdParams paymentOwnerId;
+
+    private final InvoiceOwnerIdParams invoiceOwnerId;
+
+    private RelationshipParams(RelationshipBuilder builder) {
+
+      this.parentId = builder.parentId;
+
+      this.paymentOwnerId = builder.paymentOwnerId;
+
+      this.invoiceOwnerId = builder.invoiceOwnerId;
+    }
+
+    public ParentIdParams getParentId() {
+      return parentId;
+    }
+
+    public PaymentOwnerIdParams getPaymentOwnerId() {
+      return paymentOwnerId;
+    }
+
+    public InvoiceOwnerIdParams getInvoiceOwnerId() {
+      return invoiceOwnerId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.parentId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.parentId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "parent_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.paymentOwnerId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.paymentOwnerId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "payment_owner_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.invoiceOwnerId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.invoiceOwnerId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "invoice_owner_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for RelationshipParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static RelationshipBuilder builder() {
+      return new RelationshipBuilder();
+    }
+
+    public static final class RelationshipBuilder {
+
+      private ParentIdParams parentId;
+
+      private PaymentOwnerIdParams paymentOwnerId;
+
+      private InvoiceOwnerIdParams invoiceOwnerId;
+
+      private RelationshipBuilder() {}
+
+      public RelationshipBuilder parentId(ParentIdParams value) {
+        this.parentId = value;
+        return this;
+      }
+
+      public RelationshipBuilder paymentOwnerId(PaymentOwnerIdParams value) {
+        this.paymentOwnerId = value;
+        return this;
+      }
+
+      public RelationshipBuilder invoiceOwnerId(InvoiceOwnerIdParams value) {
+        this.invoiceOwnerId = value;
+        return this;
+      }
+
+      public RelationshipParams build() {
+        return new RelationshipParams(this);
+      }
+    }
+  }
+
+  public static final class ParentIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private ParentIdParams(ParentIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ParentIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ParentIdBuilder builder() {
+      return new ParentIdBuilder();
+    }
+
+    public static final class ParentIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private ParentIdBuilder() {}
+
+      public ParentIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ParentIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ParentIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ParentIdParams build() {
+        return new ParentIdParams(this);
+      }
+    }
+  }
+
+  public static final class PaymentOwnerIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private PaymentOwnerIdParams(PaymentOwnerIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentOwnerIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentOwnerIdBuilder builder() {
+      return new PaymentOwnerIdBuilder();
+    }
+
+    public static final class PaymentOwnerIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private PaymentOwnerIdBuilder() {}
+
+      public PaymentOwnerIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PaymentOwnerIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PaymentOwnerIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PaymentOwnerIdParams build() {
+        return new PaymentOwnerIdParams(this);
+      }
+    }
+  }
+
+  public static final class InvoiceOwnerIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private InvoiceOwnerIdParams(InvoiceOwnerIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceOwnerIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceOwnerIdBuilder builder() {
+      return new InvoiceOwnerIdBuilder();
+    }
+
+    public static final class InvoiceOwnerIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private InvoiceOwnerIdBuilder() {}
+
+      public InvoiceOwnerIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public InvoiceOwnerIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public InvoiceOwnerIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public InvoiceOwnerIdParams build() {
+        return new InvoiceOwnerIdParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportSubscriptionsParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportSubscriptionsParams.java
new file mode 100644
index 00000000..e06164b8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportSubscriptionsParams.java
@@ -0,0 +1,3107 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportSubscriptionsParams {
+
+  private final ExportType exportType;
+
+  private final ItemIdParams itemId;
+
+  private final ItemPriceIdParams itemPriceId;
+
+  private final CancelReasonCodeParams cancelReasonCode;
+
+  private final SubscriptionParams subscription;
+
+  private ExportSubscriptionsParams(ExportSubscriptionsBuilder builder) {
+
+    this.exportType = builder.exportType;
+
+    this.itemId = builder.itemId;
+
+    this.itemPriceId = builder.itemPriceId;
+
+    this.cancelReasonCode = builder.cancelReasonCode;
+
+    this.subscription = builder.subscription;
+  }
+
+  public ExportType getExportType() {
+    return exportType;
+  }
+
+  public ItemIdParams getItemId() {
+    return itemId;
+  }
+
+  public ItemPriceIdParams getItemPriceId() {
+    return itemPriceId;
+  }
+
+  public CancelReasonCodeParams getCancelReasonCode() {
+    return cancelReasonCode;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.exportType != null) {
+
+      formData.put("export_type", this.exportType);
+    }
+
+    if (this.itemId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemPriceId != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemPriceId.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_price_id[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.cancelReasonCode != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.cancelReasonCode.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "cancel_reason_code[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportSubscriptionsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportSubscriptionsBuilder builder() {
+    return new ExportSubscriptionsBuilder();
+  }
+
+  public static final class ExportSubscriptionsBuilder {
+
+    private ExportType exportType;
+
+    private ItemIdParams itemId;
+
+    private ItemPriceIdParams itemPriceId;
+
+    private CancelReasonCodeParams cancelReasonCode;
+
+    private SubscriptionParams subscription;
+
+    private ExportSubscriptionsBuilder() {}
+
+    public ExportSubscriptionsBuilder exportType(ExportType value) {
+      this.exportType = value;
+      return this;
+    }
+
+    public ExportSubscriptionsBuilder itemId(ItemIdParams value) {
+      this.itemId = value;
+      return this;
+    }
+
+    public ExportSubscriptionsBuilder itemPriceId(ItemPriceIdParams value) {
+      this.itemPriceId = value;
+      return this;
+    }
+
+    public ExportSubscriptionsBuilder cancelReasonCode(CancelReasonCodeParams value) {
+      this.cancelReasonCode = value;
+      return this;
+    }
+
+    public ExportSubscriptionsBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public ExportSubscriptionsParams build() {
+      return new ExportSubscriptionsParams(this);
+    }
+  }
+
+  public enum ExportType {
+    DATA("data"),
+
+    IMPORT_FRIENDLY_DATA("import_friendly_data"),
+
+    /** An enum member indicating that ExportType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ExportType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ExportType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ExportType enumValue : ExportType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ItemIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemIdParams(ItemIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemIdBuilder builder() {
+      return new ItemIdBuilder();
+    }
+
+    public static final class ItemIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemIdBuilder() {}
+
+      public ItemIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ItemIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemIdParams build() {
+        return new ItemIdParams(this);
+      }
+    }
+  }
+
+  public static final class ItemPriceIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ItemPriceIdParams(ItemPriceIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemPriceIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemPriceIdBuilder builder() {
+      return new ItemPriceIdBuilder();
+    }
+
+    public static final class ItemPriceIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private ItemPriceIdBuilder() {}
+
+      public ItemPriceIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ItemPriceIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ItemPriceIdParams build() {
+        return new ItemPriceIdParams(this);
+      }
+    }
+  }
+
+  public static final class CancelReasonCodeParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CancelReasonCodeParams(CancelReasonCodeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CancelReasonCodeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CancelReasonCodeBuilder builder() {
+      return new CancelReasonCodeBuilder();
+    }
+
+    public static final class CancelReasonCodeBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CancelReasonCodeBuilder() {}
+
+      public CancelReasonCodeBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CancelReasonCodeBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CancelReasonCodeBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CancelReasonCodeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CancelReasonCodeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CancelReasonCodeParams build() {
+        return new CancelReasonCodeParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final IdParams id;
+
+    private final CustomerIdParams customerId;
+
+    private final StatusParams status;
+
+    private final CancelReasonParams cancelReason;
+
+    private final RemainingBillingCyclesParams remainingBillingCycles;
+
+    private final CreatedAtParams createdAt;
+
+    private final ActivatedAtParams activatedAt;
+
+    private final NextBillingAtParams nextBillingAt;
+
+    private final CancelledAtParams cancelledAt;
+
+    private final HasScheduledChangesParams hasScheduledChanges;
+
+    private final UpdatedAtParams updatedAt;
+
+    private final OfflinePaymentMethodParams offlinePaymentMethod;
+
+    private final AutoCloseInvoicesParams autoCloseInvoices;
+
+    private final ChannelParams channel;
+
+    private final PlanIdParams planId;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.customerId = builder.customerId;
+
+      this.status = builder.status;
+
+      this.cancelReason = builder.cancelReason;
+
+      this.remainingBillingCycles = builder.remainingBillingCycles;
+
+      this.createdAt = builder.createdAt;
+
+      this.activatedAt = builder.activatedAt;
+
+      this.nextBillingAt = builder.nextBillingAt;
+
+      this.cancelledAt = builder.cancelledAt;
+
+      this.hasScheduledChanges = builder.hasScheduledChanges;
+
+      this.updatedAt = builder.updatedAt;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.autoCloseInvoices = builder.autoCloseInvoices;
+
+      this.channel = builder.channel;
+
+      this.planId = builder.planId;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public CustomerIdParams getCustomerId() {
+      return customerId;
+    }
+
+    public StatusParams getStatus() {
+      return status;
+    }
+
+    public CancelReasonParams getCancelReason() {
+      return cancelReason;
+    }
+
+    public RemainingBillingCyclesParams getRemainingBillingCycles() {
+      return remainingBillingCycles;
+    }
+
+    public CreatedAtParams getCreatedAt() {
+      return createdAt;
+    }
+
+    public ActivatedAtParams getActivatedAt() {
+      return activatedAt;
+    }
+
+    public NextBillingAtParams getNextBillingAt() {
+      return nextBillingAt;
+    }
+
+    public CancelledAtParams getCancelledAt() {
+      return cancelledAt;
+    }
+
+    public HasScheduledChangesParams getHasScheduledChanges() {
+      return hasScheduledChanges;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    public OfflinePaymentMethodParams getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public AutoCloseInvoicesParams getAutoCloseInvoices() {
+      return autoCloseInvoices;
+    }
+
+    public ChannelParams getChannel() {
+      return channel;
+    }
+
+    public PlanIdParams getPlanId() {
+      return planId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.customerId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.customerId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "customer_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.cancelReason != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.cancelReason.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "cancel_reason[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.remainingBillingCycles != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.remainingBillingCycles.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "remaining_billing_cycles[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.createdAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.createdAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "created_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.activatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.activatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "activated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.nextBillingAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.nextBillingAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "next_billing_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.cancelledAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.cancelledAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "cancelled_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.hasScheduledChanges != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.hasScheduledChanges.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "has_scheduled_changes[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.offlinePaymentMethod.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "offline_payment_method[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.autoCloseInvoices != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.autoCloseInvoices.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "auto_close_invoices[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.channel != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.channel.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "channel[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.planId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.planId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "plan_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private IdParams id;
+
+      private CustomerIdParams customerId;
+
+      private StatusParams status;
+
+      private CancelReasonParams cancelReason;
+
+      private RemainingBillingCyclesParams remainingBillingCycles;
+
+      private CreatedAtParams createdAt;
+
+      private ActivatedAtParams activatedAt;
+
+      private NextBillingAtParams nextBillingAt;
+
+      private CancelledAtParams cancelledAt;
+
+      private HasScheduledChangesParams hasScheduledChanges;
+
+      private UpdatedAtParams updatedAt;
+
+      private OfflinePaymentMethodParams offlinePaymentMethod;
+
+      private AutoCloseInvoicesParams autoCloseInvoices;
+
+      private ChannelParams channel;
+
+      private PlanIdParams planId;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder customerId(CustomerIdParams value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder status(StatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public SubscriptionBuilder cancelReason(CancelReasonParams value) {
+        this.cancelReason = value;
+        return this;
+      }
+
+      public SubscriptionBuilder remainingBillingCycles(RemainingBillingCyclesParams value) {
+        this.remainingBillingCycles = value;
+        return this;
+      }
+
+      public SubscriptionBuilder createdAt(CreatedAtParams value) {
+        this.createdAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder activatedAt(ActivatedAtParams value) {
+        this.activatedAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder nextBillingAt(NextBillingAtParams value) {
+        this.nextBillingAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder cancelledAt(CancelledAtParams value) {
+        this.cancelledAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder hasScheduledChanges(HasScheduledChangesParams value) {
+        this.hasScheduledChanges = value;
+        return this;
+      }
+
+      public SubscriptionBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethodParams value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCloseInvoices(AutoCloseInvoicesParams value) {
+        this.autoCloseInvoices = value;
+        return this;
+      }
+
+      public SubscriptionBuilder channel(ChannelParams value) {
+        this.channel = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planId(PlanIdParams value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CustomerIdParams(CustomerIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerIdBuilder builder() {
+      return new CustomerIdBuilder();
+    }
+
+    public static final class CustomerIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private CustomerIdBuilder() {}
+
+      public CustomerIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CustomerIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CustomerIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CustomerIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CustomerIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CustomerIdParams build() {
+        return new CustomerIdParams(this);
+      }
+    }
+  }
+
+  public static final class StatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private StatusParams(StatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatusBuilder builder() {
+      return new StatusBuilder();
+    }
+
+    public static final class StatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private StatusBuilder() {}
+
+      public StatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public StatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public StatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public StatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public StatusParams build() {
+        return new StatusParams(this);
+      }
+    }
+
+    public enum Is {
+      FUTURE("future"),
+
+      IN_TRIAL("in_trial"),
+
+      ACTIVE("active"),
+
+      NON_RENEWING("non_renewing"),
+
+      PAUSED("paused"),
+
+      CANCELLED("cancelled"),
+
+      TRANSFERRED("transferred"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      FUTURE("future"),
+
+      IN_TRIAL("in_trial"),
+
+      ACTIVE("active"),
+
+      NON_RENEWING("non_renewing"),
+
+      PAUSED("paused"),
+
+      CANCELLED("cancelled"),
+
+      TRANSFERRED("transferred"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CancelReasonParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private final IsPresent isPresent;
+
+    private CancelReasonParams(CancelReasonBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CancelReasonParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CancelReasonBuilder builder() {
+      return new CancelReasonBuilder();
+    }
+
+    public static final class CancelReasonBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private IsPresent isPresent;
+
+      private CancelReasonBuilder() {}
+
+      public CancelReasonBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public CancelReasonBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CancelReasonBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CancelReasonBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CancelReasonBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public CancelReasonParams build() {
+        return new CancelReasonParams(this);
+      }
+    }
+
+    public enum Is {
+      NOT_PAID("not_paid"),
+
+      NO_CARD("no_card"),
+
+      FRAUD_REVIEW_FAILED("fraud_review_failed"),
+
+      NON_COMPLIANT_EU_CUSTOMER("non_compliant_eu_customer"),
+
+      TAX_CALCULATION_FAILED("tax_calculation_failed"),
+
+      CURRENCY_INCOMPATIBLE_WITH_GATEWAY("currency_incompatible_with_gateway"),
+
+      NON_COMPLIANT_CUSTOMER("non_compliant_customer"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      NOT_PAID("not_paid"),
+
+      NO_CARD("no_card"),
+
+      FRAUD_REVIEW_FAILED("fraud_review_failed"),
+
+      NON_COMPLIANT_EU_CUSTOMER("non_compliant_eu_customer"),
+
+      TAX_CALCULATION_FAILED("tax_calculation_failed"),
+
+      CURRENCY_INCOMPATIBLE_WITH_GATEWAY("currency_incompatible_with_gateway"),
+
+      NON_COMPLIANT_CUSTOMER("non_compliant_customer"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class RemainingBillingCyclesParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private final IsPresent isPresent;
+
+    private RemainingBillingCyclesParams(RemainingBillingCyclesBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for RemainingBillingCyclesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static RemainingBillingCyclesBuilder builder() {
+      return new RemainingBillingCyclesBuilder();
+    }
+
+    public static final class RemainingBillingCyclesBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private IsPresent isPresent;
+
+      private RemainingBillingCyclesBuilder() {}
+
+      public RemainingBillingCyclesBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public RemainingBillingCyclesParams build() {
+        return new RemainingBillingCyclesParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CreatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private CreatedAtParams(CreatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreatedAtBuilder builder() {
+      return new CreatedAtBuilder();
+    }
+
+    public static final class CreatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private CreatedAtBuilder() {}
+
+      public CreatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public CreatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public CreatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public CreatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public CreatedAtParams build() {
+        return new CreatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class ActivatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private final IsPresent isPresent;
+
+    private ActivatedAtParams(ActivatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ActivatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ActivatedAtBuilder builder() {
+      return new ActivatedAtBuilder();
+    }
+
+    public static final class ActivatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private IsPresent isPresent;
+
+      private ActivatedAtBuilder() {}
+
+      public ActivatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public ActivatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public ActivatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public ActivatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public ActivatedAtBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public ActivatedAtParams build() {
+        return new ActivatedAtParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class NextBillingAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private NextBillingAtParams(NextBillingAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NextBillingAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NextBillingAtBuilder builder() {
+      return new NextBillingAtBuilder();
+    }
+
+    public static final class NextBillingAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private NextBillingAtBuilder() {}
+
+      public NextBillingAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public NextBillingAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public NextBillingAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public NextBillingAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public NextBillingAtParams build() {
+        return new NextBillingAtParams(this);
+      }
+    }
+  }
+
+  public static final class CancelledAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private CancelledAtParams(CancelledAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CancelledAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CancelledAtBuilder builder() {
+      return new CancelledAtBuilder();
+    }
+
+    public static final class CancelledAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private CancelledAtBuilder() {}
+
+      public CancelledAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public CancelledAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public CancelledAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public CancelledAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public CancelledAtParams build() {
+        return new CancelledAtParams(this);
+      }
+    }
+  }
+
+  public static final class HasScheduledChangesParams {
+
+    private final Is is;
+
+    private HasScheduledChangesParams(HasScheduledChangesBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for HasScheduledChangesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static HasScheduledChangesBuilder builder() {
+      return new HasScheduledChangesBuilder();
+    }
+
+    public static final class HasScheduledChangesBuilder {
+
+      private Is is;
+
+      private HasScheduledChangesBuilder() {}
+
+      public HasScheduledChangesBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public HasScheduledChangesParams build() {
+        return new HasScheduledChangesParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+
+  public static final class OfflinePaymentMethodParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private OfflinePaymentMethodParams(OfflinePaymentMethodBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for OfflinePaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static OfflinePaymentMethodBuilder builder() {
+      return new OfflinePaymentMethodBuilder();
+    }
+
+    public static final class OfflinePaymentMethodBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private OfflinePaymentMethodBuilder() {}
+
+      public OfflinePaymentMethodBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public OfflinePaymentMethodParams build() {
+        return new OfflinePaymentMethodParams(this);
+      }
+    }
+
+    public enum Is {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AutoCloseInvoicesParams {
+
+    private final Is is;
+
+    private AutoCloseInvoicesParams(AutoCloseInvoicesBuilder builder) {
+
+      this.is = builder.is;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AutoCloseInvoicesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AutoCloseInvoicesBuilder builder() {
+      return new AutoCloseInvoicesBuilder();
+    }
+
+    public static final class AutoCloseInvoicesBuilder {
+
+      private Is is;
+
+      private AutoCloseInvoicesBuilder() {}
+
+      public AutoCloseInvoicesBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public AutoCloseInvoicesParams build() {
+        return new AutoCloseInvoicesParams(this);
+      }
+    }
+
+    public enum Is {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChannelParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private ChannelParams(ChannelBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChannelParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChannelBuilder builder() {
+      return new ChannelBuilder();
+    }
+
+    public static final class ChannelBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private ChannelBuilder() {}
+
+      public ChannelBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public ChannelBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ChannelBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public ChannelBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public ChannelParams build() {
+        return new ChannelParams(this);
+      }
+    }
+
+    public enum Is {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      WEB("web"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PlanIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PlanIdParams(PlanIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PlanIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PlanIdBuilder builder() {
+      return new PlanIdBuilder();
+    }
+
+    public static final class PlanIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private PlanIdBuilder() {}
+
+      public PlanIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PlanIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PlanIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PlanIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PlanIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PlanIdParams build() {
+        return new PlanIdParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/export/params/ExportTransactionsParams.java b/src/main/java/com/chargebee/v4/models/export/params/ExportTransactionsParams.java
new file mode 100644
index 00000000..96b45123
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/params/ExportTransactionsParams.java
@@ -0,0 +1,3084 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.export.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportTransactionsParams {
+
+  private final TransactionParams transaction;
+
+  private ExportTransactionsParams(ExportTransactionsBuilder builder) {
+
+    this.transaction = builder.transaction;
+  }
+
+  public TransactionParams getTransaction() {
+    return transaction;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.transaction != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.transaction.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "transaction[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportTransactionsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportTransactionsBuilder builder() {
+    return new ExportTransactionsBuilder();
+  }
+
+  public static final class ExportTransactionsBuilder {
+
+    private TransactionParams transaction;
+
+    private ExportTransactionsBuilder() {}
+
+    public ExportTransactionsBuilder transaction(TransactionParams value) {
+      this.transaction = value;
+      return this;
+    }
+
+    public ExportTransactionsParams build() {
+      return new ExportTransactionsParams(this);
+    }
+  }
+
+  public static final class TransactionParams {
+
+    private final IdParams id;
+
+    private final CustomerIdParams customerId;
+
+    private final SubscriptionIdParams subscriptionId;
+
+    private final PaymentSourceIdParams paymentSourceId;
+
+    private final PaymentMethodParams paymentMethod;
+
+    private final GatewayParams gateway;
+
+    private final GatewayAccountIdParams gatewayAccountId;
+
+    private final IdAtGatewayParams idAtGateway;
+
+    private final ReferenceNumberParams referenceNumber;
+
+    private final TypeParams type;
+
+    private final DateParams date;
+
+    private final AmountParams amount;
+
+    private final AmountCapturableParams amountCapturable;
+
+    private final StatusParams status;
+
+    private final UpdatedAtParams updatedAt;
+
+    private TransactionParams(TransactionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.customerId = builder.customerId;
+
+      this.subscriptionId = builder.subscriptionId;
+
+      this.paymentSourceId = builder.paymentSourceId;
+
+      this.paymentMethod = builder.paymentMethod;
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.idAtGateway = builder.idAtGateway;
+
+      this.referenceNumber = builder.referenceNumber;
+
+      this.type = builder.type;
+
+      this.date = builder.date;
+
+      this.amount = builder.amount;
+
+      this.amountCapturable = builder.amountCapturable;
+
+      this.status = builder.status;
+
+      this.updatedAt = builder.updatedAt;
+    }
+
+    public IdParams getId() {
+      return id;
+    }
+
+    public CustomerIdParams getCustomerId() {
+      return customerId;
+    }
+
+    public SubscriptionIdParams getSubscriptionId() {
+      return subscriptionId;
+    }
+
+    public PaymentSourceIdParams getPaymentSourceId() {
+      return paymentSourceId;
+    }
+
+    public PaymentMethodParams getPaymentMethod() {
+      return paymentMethod;
+    }
+
+    public GatewayParams getGateway() {
+      return gateway;
+    }
+
+    public GatewayAccountIdParams getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public IdAtGatewayParams getIdAtGateway() {
+      return idAtGateway;
+    }
+
+    public ReferenceNumberParams getReferenceNumber() {
+      return referenceNumber;
+    }
+
+    public TypeParams getType() {
+      return type;
+    }
+
+    public DateParams getDate() {
+      return date;
+    }
+
+    public AmountParams getAmount() {
+      return amount;
+    }
+
+    public AmountCapturableParams getAmountCapturable() {
+      return amountCapturable;
+    }
+
+    public StatusParams getStatus() {
+      return status;
+    }
+
+    public UpdatedAtParams getUpdatedAt() {
+      return updatedAt;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.id.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.customerId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.customerId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "customer_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.subscriptionId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.subscriptionId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "subscription_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.paymentSourceId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.paymentSourceId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "payment_source_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.paymentMethod != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.paymentMethod.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "payment_method[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.gateway != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.gateway.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "gateway[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.gatewayAccountId.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "gateway_account_id[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.idAtGateway != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.idAtGateway.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "id_at_gateway[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.referenceNumber != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.referenceNumber.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "reference_number[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.type != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.type.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "type[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.date != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.date.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "date[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amount != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amount.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.amountCapturable != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.amountCapturable.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "amount_capturable[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.status != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.status.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "status[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      if (this.updatedAt != null) {
+
+        // Single object
+        Map<String, Object> nestedData = this.updatedAt.toFormData();
+        for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+          String nestedKey = "updated_at[" + entry.getKey() + "]";
+          formData.put(nestedKey, entry.getValue());
+        }
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TransactionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TransactionBuilder builder() {
+      return new TransactionBuilder();
+    }
+
+    public static final class TransactionBuilder {
+
+      private IdParams id;
+
+      private CustomerIdParams customerId;
+
+      private SubscriptionIdParams subscriptionId;
+
+      private PaymentSourceIdParams paymentSourceId;
+
+      private PaymentMethodParams paymentMethod;
+
+      private GatewayParams gateway;
+
+      private GatewayAccountIdParams gatewayAccountId;
+
+      private IdAtGatewayParams idAtGateway;
+
+      private ReferenceNumberParams referenceNumber;
+
+      private TypeParams type;
+
+      private DateParams date;
+
+      private AmountParams amount;
+
+      private AmountCapturableParams amountCapturable;
+
+      private StatusParams status;
+
+      private UpdatedAtParams updatedAt;
+
+      private TransactionBuilder() {}
+
+      public TransactionBuilder id(IdParams value) {
+        this.id = value;
+        return this;
+      }
+
+      public TransactionBuilder customerId(CustomerIdParams value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public TransactionBuilder subscriptionId(SubscriptionIdParams value) {
+        this.subscriptionId = value;
+        return this;
+      }
+
+      public TransactionBuilder paymentSourceId(PaymentSourceIdParams value) {
+        this.paymentSourceId = value;
+        return this;
+      }
+
+      public TransactionBuilder paymentMethod(PaymentMethodParams value) {
+        this.paymentMethod = value;
+        return this;
+      }
+
+      public TransactionBuilder gateway(GatewayParams value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public TransactionBuilder gatewayAccountId(GatewayAccountIdParams value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public TransactionBuilder idAtGateway(IdAtGatewayParams value) {
+        this.idAtGateway = value;
+        return this;
+      }
+
+      public TransactionBuilder referenceNumber(ReferenceNumberParams value) {
+        this.referenceNumber = value;
+        return this;
+      }
+
+      public TransactionBuilder type(TypeParams value) {
+        this.type = value;
+        return this;
+      }
+
+      public TransactionBuilder date(DateParams value) {
+        this.date = value;
+        return this;
+      }
+
+      public TransactionBuilder amount(AmountParams value) {
+        this.amount = value;
+        return this;
+      }
+
+      public TransactionBuilder amountCapturable(AmountCapturableParams value) {
+        this.amountCapturable = value;
+        return this;
+      }
+
+      public TransactionBuilder status(StatusParams value) {
+        this.status = value;
+        return this;
+      }
+
+      public TransactionBuilder updatedAt(UpdatedAtParams value) {
+        this.updatedAt = value;
+        return this;
+      }
+
+      public TransactionParams build() {
+        return new TransactionParams(this);
+      }
+    }
+  }
+
+  public static final class IdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private IdParams(IdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdBuilder builder() {
+      return new IdBuilder();
+    }
+
+    public static final class IdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private IdBuilder() {}
+
+      public IdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public IdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public IdParams build() {
+        return new IdParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private final String in;
+
+    private final String notIn;
+
+    private CustomerIdParams(CustomerIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerIdBuilder builder() {
+      return new CustomerIdBuilder();
+    }
+
+    public static final class CustomerIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private String in;
+
+      private String notIn;
+
+      private CustomerIdBuilder() {}
+
+      public CustomerIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public CustomerIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public CustomerIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public CustomerIdBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public CustomerIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public CustomerIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public CustomerIdParams build() {
+        return new CustomerIdParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private final String in;
+
+    private final String notIn;
+
+    private SubscriptionIdParams(SubscriptionIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionIdBuilder builder() {
+      return new SubscriptionIdBuilder();
+    }
+
+    public static final class SubscriptionIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private String in;
+
+      private String notIn;
+
+      private SubscriptionIdBuilder() {}
+
+      public SubscriptionIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public SubscriptionIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public SubscriptionIdParams build() {
+        return new SubscriptionIdParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentSourceIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PaymentSourceIdParams(PaymentSourceIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentSourceIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentSourceIdBuilder builder() {
+      return new PaymentSourceIdBuilder();
+    }
+
+    public static final class PaymentSourceIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private String in;
+
+      private String notIn;
+
+      private PaymentSourceIdBuilder() {}
+
+      public PaymentSourceIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public PaymentSourceIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PaymentSourceIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public PaymentSourceIdBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public PaymentSourceIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PaymentSourceIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PaymentSourceIdParams build() {
+        return new PaymentSourceIdParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentMethodParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private PaymentMethodParams(PaymentMethodBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentMethodBuilder builder() {
+      return new PaymentMethodBuilder();
+    }
+
+    public static final class PaymentMethodBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private PaymentMethodBuilder() {}
+
+      public PaymentMethodBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public PaymentMethodParams build() {
+        return new PaymentMethodParams(this);
+      }
+    }
+
+    public enum Is {
+      CARD("card"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      CHARGEBACK("chargeback"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      ALIPAY("alipay"),
+
+      UNIONPAY("unionpay"),
+
+      APPLE_PAY("apple_pay"),
+
+      WECHAT_PAY("wechat_pay"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      IDEAL("ideal"),
+
+      GOOGLE_PAY("google_pay"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GIROPAY("giropay"),
+
+      DOTPAY("dotpay"),
+
+      OTHER("other"),
+
+      APP_STORE("app_store"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PLAY_STORE("play_store"),
+
+      CUSTOM("custom"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      CARD("card"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      CHARGEBACK("chargeback"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      ALIPAY("alipay"),
+
+      UNIONPAY("unionpay"),
+
+      APPLE_PAY("apple_pay"),
+
+      WECHAT_PAY("wechat_pay"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      IDEAL("ideal"),
+
+      GOOGLE_PAY("google_pay"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GIROPAY("giropay"),
+
+      DOTPAY("dotpay"),
+
+      OTHER("other"),
+
+      APP_STORE("app_store"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PLAY_STORE("play_store"),
+
+      CUSTOM("custom"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class GatewayParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private GatewayParams(GatewayBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GatewayParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GatewayBuilder builder() {
+      return new GatewayBuilder();
+    }
+
+    public static final class GatewayBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private GatewayBuilder() {}
+
+      public GatewayBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public GatewayBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public GatewayBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public GatewayBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public GatewayParams build() {
+        return new GatewayParams(this);
+      }
+    }
+
+    public enum Is {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      GOCARDLESS("gocardless"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      NOT_APPLICABLE("not_applicable"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      GOCARDLESS("gocardless"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      NOT_APPLICABLE("not_applicable"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class GatewayAccountIdParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final String in;
+
+    private final String notIn;
+
+    private GatewayAccountIdParams(GatewayAccountIdBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GatewayAccountIdParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GatewayAccountIdBuilder builder() {
+      return new GatewayAccountIdBuilder();
+    }
+
+    public static final class GatewayAccountIdBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private String in;
+
+      private String notIn;
+
+      private GatewayAccountIdBuilder() {}
+
+      public GatewayAccountIdBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public GatewayAccountIdBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public GatewayAccountIdBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public GatewayAccountIdBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public GatewayAccountIdBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public GatewayAccountIdParams build() {
+        return new GatewayAccountIdParams(this);
+      }
+    }
+  }
+
+  public static final class IdAtGatewayParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private IdAtGatewayParams(IdAtGatewayBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for IdAtGatewayParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static IdAtGatewayBuilder builder() {
+      return new IdAtGatewayBuilder();
+    }
+
+    public static final class IdAtGatewayBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IdAtGatewayBuilder() {}
+
+      public IdAtGatewayBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public IdAtGatewayBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public IdAtGatewayBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public IdAtGatewayParams build() {
+        return new IdAtGatewayParams(this);
+      }
+    }
+  }
+
+  public static final class ReferenceNumberParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String startsWith;
+
+    private final IsPresent isPresent;
+
+    private ReferenceNumberParams(ReferenceNumberBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.startsWith = builder.startsWith;
+
+      this.isPresent = builder.isPresent;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getStartsWith() {
+      return startsWith;
+    }
+
+    public IsPresent getIsPresent() {
+      return isPresent;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.startsWith != null) {
+
+        formData.put("starts_with", this.startsWith);
+      }
+
+      if (this.isPresent != null) {
+
+        formData.put("is_present", this.isPresent);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ReferenceNumberParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ReferenceNumberBuilder builder() {
+      return new ReferenceNumberBuilder();
+    }
+
+    public static final class ReferenceNumberBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String startsWith;
+
+      private IsPresent isPresent;
+
+      private ReferenceNumberBuilder() {}
+
+      public ReferenceNumberBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public ReferenceNumberBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public ReferenceNumberBuilder startsWith(String value) {
+        this.startsWith = value;
+        return this;
+      }
+
+      public ReferenceNumberBuilder isPresent(IsPresent value) {
+        this.isPresent = value;
+        return this;
+      }
+
+      public ReferenceNumberParams build() {
+        return new ReferenceNumberParams(this);
+      }
+    }
+
+    public enum IsPresent {
+      TRUE("true"),
+
+      FALSE("false"),
+
+      /** An enum member indicating that IsPresent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsPresent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsPresent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsPresent enumValue : IsPresent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TypeParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private TypeParams(TypeBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TypeParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TypeBuilder builder() {
+      return new TypeBuilder();
+    }
+
+    public static final class TypeBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private TypeBuilder() {}
+
+      public TypeBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public TypeBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public TypeBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public TypeBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public TypeParams build() {
+        return new TypeParams(this);
+      }
+    }
+
+    public enum Is {
+      AUTHORIZATION("authorization"),
+
+      PAYMENT("payment"),
+
+      REFUND("refund"),
+
+      PAYMENT_REVERSAL("payment_reversal"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      AUTHORIZATION("authorization"),
+
+      PAYMENT("payment"),
+
+      REFUND("refund"),
+
+      PAYMENT_REVERSAL("payment_reversal"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DateParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private DateParams(DateBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DateParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DateBuilder builder() {
+      return new DateBuilder();
+    }
+
+    public static final class DateBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private DateBuilder() {}
+
+      public DateBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public DateBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public DateBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public DateBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public DateParams build() {
+        return new DateParams(this);
+      }
+    }
+  }
+
+  public static final class AmountParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountParams(AmountBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountBuilder builder() {
+      return new AmountBuilder();
+    }
+
+    public static final class AmountBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountBuilder() {}
+
+      public AmountBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountParams build() {
+        return new AmountParams(this);
+      }
+    }
+  }
+
+  public static final class AmountCapturableParams {
+
+    private final String is;
+
+    private final String isNot;
+
+    private final String lt;
+
+    private final String lte;
+
+    private final String gt;
+
+    private final String gte;
+
+    private final String between;
+
+    private AmountCapturableParams(AmountCapturableBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.lt = builder.lt;
+
+      this.lte = builder.lte;
+
+      this.gt = builder.gt;
+
+      this.gte = builder.gte;
+
+      this.between = builder.between;
+    }
+
+    public String getIs() {
+      return is;
+    }
+
+    public String getIsNot() {
+      return isNot;
+    }
+
+    public String getLt() {
+      return lt;
+    }
+
+    public String getLte() {
+      return lte;
+    }
+
+    public String getGt() {
+      return gt;
+    }
+
+    public String getGte() {
+      return gte;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.lt != null) {
+
+        formData.put("lt", this.lt);
+      }
+
+      if (this.lte != null) {
+
+        formData.put("lte", this.lte);
+      }
+
+      if (this.gt != null) {
+
+        formData.put("gt", this.gt);
+      }
+
+      if (this.gte != null) {
+
+        formData.put("gte", this.gte);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AmountCapturableParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AmountCapturableBuilder builder() {
+      return new AmountCapturableBuilder();
+    }
+
+    public static final class AmountCapturableBuilder {
+
+      private String is;
+
+      private String isNot;
+
+      private String lt;
+
+      private String lte;
+
+      private String gt;
+
+      private String gte;
+
+      private String between;
+
+      private AmountCapturableBuilder() {}
+
+      public AmountCapturableBuilder is(String value) {
+        this.is = value;
+        return this;
+      }
+
+      public AmountCapturableBuilder isNot(String value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public AmountCapturableBuilder lt(String value) {
+        this.lt = value;
+        return this;
+      }
+
+      public AmountCapturableBuilder lte(String value) {
+        this.lte = value;
+        return this;
+      }
+
+      public AmountCapturableBuilder gt(String value) {
+        this.gt = value;
+        return this;
+      }
+
+      public AmountCapturableBuilder gte(String value) {
+        this.gte = value;
+        return this;
+      }
+
+      public AmountCapturableBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public AmountCapturableParams build() {
+        return new AmountCapturableParams(this);
+      }
+    }
+  }
+
+  public static final class StatusParams {
+
+    private final Is is;
+
+    private final IsNot isNot;
+
+    private final String in;
+
+    private final String notIn;
+
+    private StatusParams(StatusBuilder builder) {
+
+      this.is = builder.is;
+
+      this.isNot = builder.isNot;
+
+      this.in = builder.in;
+
+      this.notIn = builder.notIn;
+    }
+
+    public Is getIs() {
+      return is;
+    }
+
+    public IsNot getIsNot() {
+      return isNot;
+    }
+
+    public String getIn() {
+      return in;
+    }
+
+    public String getNotIn() {
+      return notIn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.is != null) {
+
+        formData.put("is", this.is);
+      }
+
+      if (this.isNot != null) {
+
+        formData.put("is_not", this.isNot);
+      }
+
+      if (this.in != null) {
+
+        formData.put("in", this.in);
+      }
+
+      if (this.notIn != null) {
+
+        formData.put("not_in", this.notIn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatusParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatusBuilder builder() {
+      return new StatusBuilder();
+    }
+
+    public static final class StatusBuilder {
+
+      private Is is;
+
+      private IsNot isNot;
+
+      private String in;
+
+      private String notIn;
+
+      private StatusBuilder() {}
+
+      public StatusBuilder is(Is value) {
+        this.is = value;
+        return this;
+      }
+
+      public StatusBuilder isNot(IsNot value) {
+        this.isNot = value;
+        return this;
+      }
+
+      public StatusBuilder in(String value) {
+        this.in = value;
+        return this;
+      }
+
+      public StatusBuilder notIn(String value) {
+        this.notIn = value;
+        return this;
+      }
+
+      public StatusParams build() {
+        return new StatusParams(this);
+      }
+    }
+
+    public enum Is {
+      IN_PROGRESS("in_progress"),
+
+      SUCCESS("success"),
+
+      VOIDED("voided"),
+
+      FAILURE("failure"),
+
+      TIMEOUT("timeout"),
+
+      NEEDS_ATTENTION("needs_attention"),
+
+      LATE_FAILURE("late_failure"),
+
+      /** An enum member indicating that Is was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Is(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Is fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Is enumValue : Is.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum IsNot {
+      IN_PROGRESS("in_progress"),
+
+      SUCCESS("success"),
+
+      VOIDED("voided"),
+
+      FAILURE("failure"),
+
+      TIMEOUT("timeout"),
+
+      NEEDS_ATTENTION("needs_attention"),
+
+      LATE_FAILURE("late_failure"),
+
+      /** An enum member indicating that IsNot was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      IsNot(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static IsNot fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (IsNot enumValue : IsNot.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class UpdatedAtParams {
+
+    private final String after;
+
+    private final String before;
+
+    private final String on;
+
+    private final String between;
+
+    private UpdatedAtParams(UpdatedAtBuilder builder) {
+
+      this.after = builder.after;
+
+      this.before = builder.before;
+
+      this.on = builder.on;
+
+      this.between = builder.between;
+    }
+
+    public String getAfter() {
+      return after;
+    }
+
+    public String getBefore() {
+      return before;
+    }
+
+    public String getOn() {
+      return on;
+    }
+
+    public String getBetween() {
+      return between;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.after != null) {
+
+        formData.put("after", this.after);
+      }
+
+      if (this.before != null) {
+
+        formData.put("before", this.before);
+      }
+
+      if (this.on != null) {
+
+        formData.put("on", this.on);
+      }
+
+      if (this.between != null) {
+
+        formData.put("between", this.between);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UpdatedAtParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UpdatedAtBuilder builder() {
+      return new UpdatedAtBuilder();
+    }
+
+    public static final class UpdatedAtBuilder {
+
+      private String after;
+
+      private String before;
+
+      private String on;
+
+      private String between;
+
+      private UpdatedAtBuilder() {}
+
+      public UpdatedAtBuilder after(String value) {
+        this.after = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder before(String value) {
+        this.before = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder on(String value) {
+        this.on = value;
+        return this;
+      }
+
+      public UpdatedAtBuilder between(String value) {
+        this.between = value;
+        return this;
+      }
+
+      public UpdatedAtParams build() {
+        return new UpdatedAtParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportAddonsResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportAddonsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportAddonsResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportAddonsResponse.java
index 1b48185c..90a2f993 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportAddonsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportAddonsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportAttachedItemsResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportAttachedItemsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportAttachedItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportAttachedItemsResponse.java
index 338af510..7eaa3b9f 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportAttachedItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportAttachedItemsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportCouponsResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportCouponsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportCouponsResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportCouponsResponse.java
index a237dd2e..535465ba 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportCouponsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportCouponsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportCreditNotesResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportCreditNotesResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportCreditNotesResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportCreditNotesResponse.java
index 0fa65929..da8f1173 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportCreditNotesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportCreditNotesResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportCustomersResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportCustomersResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportCustomersResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportCustomersResponse.java
index 529868b2..bc9c1e1c 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportCustomersResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportCustomersResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportDeferredRevenueResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportDeferredRevenueResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportDeferredRevenueResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportDeferredRevenueResponse.java
index f1ce2826..2149807a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportDeferredRevenueResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportDeferredRevenueResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportDifferentialPricesResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportDifferentialPricesResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportDifferentialPricesResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportDifferentialPricesResponse.java
index 0b1432d9..017a0e61 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportDifferentialPricesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportDifferentialPricesResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportInvoicesResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportInvoicesResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportInvoicesResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportInvoicesResponse.java
index 52bc4f42..f4769bcf 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportInvoicesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportInvoicesResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportItemFamiliesResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportItemFamiliesResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportItemFamiliesResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportItemFamiliesResponse.java
index 9cc4eb85..29ea0b80 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportItemFamiliesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportItemFamiliesResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportItemPricesResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportItemPricesResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportItemPricesResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportItemPricesResponse.java
index 35dbb616..b43a4945 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportItemPricesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportItemPricesResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportItemsResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportItemsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportItemsResponse.java
index f6e490f1..da9b2ca3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportItemsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportOrdersResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportOrdersResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportOrdersResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportOrdersResponse.java
index 991d647d..0868e166 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportOrdersResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportOrdersResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportPlansResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportPlansResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportPlansResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportPlansResponse.java
index 4a39be1f..083fd62e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportPlansResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportPlansResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportPriceVariantsResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportPriceVariantsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportPriceVariantsResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportPriceVariantsResponse.java
index 13d773ab..57abf578 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportPriceVariantsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportPriceVariantsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/export/responses/ExportRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportRetrieveResponse.java
new file mode 100644
index 00000000..e4512ddb
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.export.responses;
+
+import com.chargebee.v4.models.export.Export;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ExportRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class ExportRetrieveResponse extends BaseResponse {
+  private final Export export;
+
+  private ExportRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.export = builder.export;
+  }
+
+  /** Parse JSON response into ExportRetrieveResponse object. */
+  public static ExportRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ExportRetrieveResponse object with HTTP response. */
+  public static ExportRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __exportJson = JsonUtil.getObject(json, "export");
+      if (__exportJson != null) {
+        builder.export(Export.fromJson(__exportJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ExportRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ExportRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ExportRetrieveResponse. */
+  public static class Builder {
+
+    private Export export;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder export(Export export) {
+      this.export = export;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ExportRetrieveResponse build() {
+      return new ExportRetrieveResponse(this);
+    }
+  }
+
+  /** Get the export from the response. */
+  public Export getExport() {
+    return export;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportRevenueRecognitionResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportRevenueRecognitionResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportRevenueRecognitionResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportRevenueRecognitionResponse.java
index b21b706e..5cb5dfb2 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportRevenueRecognitionResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportRevenueRecognitionResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportSubscriptionsResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportSubscriptionsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportSubscriptionsResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportSubscriptionsResponse.java
index 5bd71e12..ee83676b 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportSubscriptionsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportSubscriptionsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/export/ExportTransactionsResponse.java b/src/main/java/com/chargebee/v4/models/export/responses/ExportTransactionsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/export/ExportTransactionsResponse.java
rename to src/main/java/com/chargebee/v4/models/export/responses/ExportTransactionsResponse.java
index 1f318641..ffdd1263 100644
--- a/src/main/java/com/chargebee/v4/core/responses/export/ExportTransactionsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/export/responses/ExportTransactionsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.export;
+package com.chargebee.v4.models.export.responses;
 
-import com.chargebee.v4.core.models.export.Export;
+import com.chargebee.v4.models.export.Export;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/feature/Feature.java b/src/main/java/com/chargebee/v4/models/feature/Feature.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/feature/Feature.java
rename to src/main/java/com/chargebee/v4/models/feature/Feature.java
index 234878e5..5984578c 100644
--- a/src/main/java/com/chargebee/v4/core/models/feature/Feature.java
+++ b/src/main/java/com/chargebee/v4/models/feature/Feature.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.feature;
+package com.chargebee.v4.models.feature;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -24,7 +24,7 @@ public class Feature {
   private Timestamp createdAt;
   private List<Levels> levels;
 
-  private java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+  private java.util.Map<String, String> customFields = new java.util.HashMap<>();
 
   public String getId() {
     return id;
@@ -72,7 +72,7 @@ public List<Levels> getLevels() {
    *
    * @return map containing all custom fields
    */
-  public java.util.Map<String, Object> getCustomFields() {
+  public java.util.Map<String, String> getCustomFields() {
     return customFields;
   }
 
@@ -82,7 +82,7 @@ public java.util.Map<String, Object> getCustomFields() {
    * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
    * @return the value of the custom field, or null if not present
    */
-  public Object getCustomField(String fieldName) {
+  public String getCustomField(String fieldName) {
     return customFields.get(fieldName);
   }
 
@@ -151,7 +151,7 @@ public static Type fromString(String value) {
   public static Feature fromJson(String json) {
     Feature obj = new Feature();
 
-    // Parse JSON to extract all keys
+    // Parse JSON to extract all keys for custom field extraction
     java.util.Set<String> knownFields = new java.util.HashSet<>();
 
     knownFields.add("id");
@@ -211,9 +211,9 @@ public static Feature fromJson(String json) {
    * @param knownFields set of known field names
    * @return map of custom fields
    */
-  private static java.util.Map<String, Object> extractCustomFields(
+  private static java.util.Map<String, String> extractCustomFields(
       String json, java.util.Set<String> knownFields) {
-    java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+    java.util.Map<String, String> customFields = new java.util.HashMap<>();
     try {
       // Parse the entire JSON as a map
       java.util.Map<String, Object> allFields = JsonUtil.parseJsonObjectToMap(json);
@@ -222,7 +222,8 @@ private static java.util.Map<String, Object> extractCustomFields(
           String key = entry.getKey();
           // Include fields that start with "cf_" and are not in knownFields
           if (key != null && key.startsWith("cf_") && !knownFields.contains(key)) {
-            customFields.put(key, entry.getValue());
+            customFields.put(
+                key, entry.getValue() != null ? String.valueOf(entry.getValue()) : null);
           }
         }
       }
diff --git a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureActivateParams.java b/src/main/java/com/chargebee/v4/models/feature/params/FeatureActivateParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/feature/params/FeatureActivateParams.java
rename to src/main/java/com/chargebee/v4/models/feature/params/FeatureActivateParams.java
index b65f25c1..f99288ff 100644
--- a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureActivateParams.java
+++ b/src/main/java/com/chargebee/v4/models/feature/params/FeatureActivateParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.feature.params;
+package com.chargebee.v4.models.feature.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class FeatureActivateParams {
 
-  private final Map<String, Object> formData;
-
-  private FeatureActivateParams(FeatureActivateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private FeatureActivateParams(FeatureActivateBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static FeatureActivateBuilder builder() {
   }
 
   public static final class FeatureActivateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private FeatureActivateBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/models/feature/params/FeatureArchiveParams.java b/src/main/java/com/chargebee/v4/models/feature/params/FeatureArchiveParams.java
new file mode 100644
index 00000000..0cff933d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/feature/params/FeatureArchiveParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.feature.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class FeatureArchiveParams {
+
+  private FeatureArchiveParams(FeatureArchiveBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for FeatureArchiveParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static FeatureArchiveBuilder builder() {
+    return new FeatureArchiveBuilder();
+  }
+
+  public static final class FeatureArchiveBuilder {
+
+    private FeatureArchiveBuilder() {}
+
+    public FeatureArchiveParams build() {
+      return new FeatureArchiveParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/feature/params/FeatureCreateParams.java b/src/main/java/com/chargebee/v4/models/feature/params/FeatureCreateParams.java
new file mode 100644
index 00000000..cceefe75
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/feature/params/FeatureCreateParams.java
@@ -0,0 +1,363 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.feature.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class FeatureCreateParams {
+
+  private final String id;
+
+  private final String name;
+
+  private final String description;
+
+  private final Type type;
+
+  private final String unit;
+
+  private final List<LevelsParams> levels;
+
+  private final Map<String, String> customFields;
+
+  private FeatureCreateParams(FeatureCreateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.name = builder.name;
+
+    this.description = builder.description;
+
+    this.type = builder.type;
+
+    this.unit = builder.unit;
+
+    this.levels = builder.levels;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public Type getType() {
+    return type;
+  }
+
+  public String getUnit() {
+    return unit;
+  }
+
+  public List<LevelsParams> getLevels() {
+    return levels;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.type != null) {
+
+      formData.put("type", this.type);
+    }
+
+    if (this.unit != null) {
+
+      formData.put("unit", this.unit);
+    }
+
+    if (this.levels != null) {
+
+      // List of objects
+      for (int i = 0; i < this.levels.size(); i++) {
+        LevelsParams item = this.levels.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "levels[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for FeatureCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static FeatureCreateBuilder builder() {
+    return new FeatureCreateBuilder();
+  }
+
+  public static final class FeatureCreateBuilder {
+
+    private String id;
+
+    private String name;
+
+    private String description;
+
+    private Type type;
+
+    private String unit;
+
+    private List<LevelsParams> levels;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private FeatureCreateBuilder() {}
+
+    public FeatureCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public FeatureCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public FeatureCreateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public FeatureCreateBuilder type(Type value) {
+      this.type = value;
+      return this;
+    }
+
+    public FeatureCreateBuilder unit(String value) {
+      this.unit = value;
+      return this;
+    }
+
+    public FeatureCreateBuilder levels(List<LevelsParams> value) {
+      this.levels = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public FeatureCreateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public FeatureCreateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public FeatureCreateParams build() {
+      return new FeatureCreateParams(this);
+    }
+  }
+
+  public enum Type {
+    SWITCH("switch"),
+
+    CUSTOM("custom"),
+
+    QUANTITY("quantity"),
+
+    RANGE("range"),
+
+    /** An enum member indicating that Type was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Type(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Type fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Type enumValue : Type.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class LevelsParams {
+
+    private final String name;
+
+    private final String value;
+
+    private final Boolean isUnlimited;
+
+    private final Integer level;
+
+    private LevelsParams(LevelsBuilder builder) {
+
+      this.name = builder.name;
+
+      this.value = builder.value;
+
+      this.isUnlimited = builder.isUnlimited;
+
+      this.level = builder.level;
+    }
+
+    public String getName() {
+      return name;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public Boolean getIsUnlimited() {
+      return isUnlimited;
+    }
+
+    public Integer getLevel() {
+      return level;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.name != null) {
+
+        formData.put("name", this.name);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      if (this.isUnlimited != null) {
+
+        formData.put("is_unlimited", this.isUnlimited);
+      }
+
+      if (this.level != null) {
+
+        formData.put("level", this.level);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LevelsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LevelsBuilder builder() {
+      return new LevelsBuilder();
+    }
+
+    public static final class LevelsBuilder {
+
+      private String name;
+
+      private String value;
+
+      private Boolean isUnlimited;
+
+      private Integer level;
+
+      private LevelsBuilder() {}
+
+      public LevelsBuilder name(String value) {
+        this.name = value;
+        return this;
+      }
+
+      public LevelsBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public LevelsBuilder isUnlimited(Boolean value) {
+        this.isUnlimited = value;
+        return this;
+      }
+
+      public LevelsBuilder level(Integer value) {
+        this.level = value;
+        return this;
+      }
+
+      public LevelsParams build() {
+        return new LevelsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/feature/params/FeatureDeleteParams.java b/src/main/java/com/chargebee/v4/models/feature/params/FeatureDeleteParams.java
new file mode 100644
index 00000000..3178152d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/feature/params/FeatureDeleteParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.feature.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class FeatureDeleteParams {
+
+  private FeatureDeleteParams(FeatureDeleteBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for FeatureDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static FeatureDeleteBuilder builder() {
+    return new FeatureDeleteBuilder();
+  }
+
+  public static final class FeatureDeleteBuilder {
+
+    private FeatureDeleteBuilder() {}
+
+    public FeatureDeleteParams build() {
+      return new FeatureDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureListParams.java b/src/main/java/com/chargebee/v4/models/feature/params/FeatureListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/feature/params/FeatureListParams.java
rename to src/main/java/com/chargebee/v4/models/feature/params/FeatureListParams.java
index c44eaab4..aca8b522 100644
--- a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureListParams.java
+++ b/src/main/java/com/chargebee/v4/models/feature/params/FeatureListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.feature.params;
+package com.chargebee.v4.models.feature.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureReactivateParams.java b/src/main/java/com/chargebee/v4/models/feature/params/FeatureReactivateParams.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/models/feature/params/FeatureReactivateParams.java
rename to src/main/java/com/chargebee/v4/models/feature/params/FeatureReactivateParams.java
index e4e59c01..4df5a476 100644
--- a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureReactivateParams.java
+++ b/src/main/java/com/chargebee/v4/models/feature/params/FeatureReactivateParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.feature.params;
+package com.chargebee.v4.models.feature.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class FeatureReactivateParams {
 
-  private final Map<String, Object> formData;
-
-  private FeatureReactivateParams(FeatureReactivateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private FeatureReactivateParams(FeatureReactivateBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static FeatureReactivateBuilder builder() {
   }
 
   public static final class FeatureReactivateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private FeatureReactivateBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureRetrieveParams.java b/src/main/java/com/chargebee/v4/models/feature/params/FeatureRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/feature/params/FeatureRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/feature/params/FeatureRetrieveParams.java
index 74a7cd20..f2a35e6c 100644
--- a/src/main/java/com/chargebee/v4/core/models/feature/params/FeatureRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/feature/params/FeatureRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.feature.params;
+package com.chargebee.v4.models.feature.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/feature/params/FeatureUpdateParams.java b/src/main/java/com/chargebee/v4/models/feature/params/FeatureUpdateParams.java
new file mode 100644
index 00000000..9fcab768
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/feature/params/FeatureUpdateParams.java
@@ -0,0 +1,291 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.feature.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class FeatureUpdateParams {
+
+  private final String name;
+
+  private final String description;
+
+  private final String unit;
+
+  private final List<LevelsParams> levels;
+
+  private final Map<String, String> customFields;
+
+  private FeatureUpdateParams(FeatureUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.description = builder.description;
+
+    this.unit = builder.unit;
+
+    this.levels = builder.levels;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public String getUnit() {
+    return unit;
+  }
+
+  public List<LevelsParams> getLevels() {
+    return levels;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.unit != null) {
+
+      formData.put("unit", this.unit);
+    }
+
+    if (this.levels != null) {
+
+      // List of objects
+      for (int i = 0; i < this.levels.size(); i++) {
+        LevelsParams item = this.levels.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "levels[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for FeatureUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static FeatureUpdateBuilder builder() {
+    return new FeatureUpdateBuilder();
+  }
+
+  public static final class FeatureUpdateBuilder {
+
+    private String name;
+
+    private String description;
+
+    private String unit;
+
+    private List<LevelsParams> levels;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private FeatureUpdateBuilder() {}
+
+    public FeatureUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public FeatureUpdateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public FeatureUpdateBuilder unit(String value) {
+      this.unit = value;
+      return this;
+    }
+
+    public FeatureUpdateBuilder levels(List<LevelsParams> value) {
+      this.levels = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public FeatureUpdateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public FeatureUpdateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public FeatureUpdateParams build() {
+      return new FeatureUpdateParams(this);
+    }
+  }
+
+  public static final class LevelsParams {
+
+    private final String name;
+
+    private final String value;
+
+    private final Boolean isUnlimited;
+
+    private final Integer level;
+
+    private LevelsParams(LevelsBuilder builder) {
+
+      this.name = builder.name;
+
+      this.value = builder.value;
+
+      this.isUnlimited = builder.isUnlimited;
+
+      this.level = builder.level;
+    }
+
+    public String getName() {
+      return name;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public Boolean getIsUnlimited() {
+      return isUnlimited;
+    }
+
+    public Integer getLevel() {
+      return level;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.name != null) {
+
+        formData.put("name", this.name);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      if (this.isUnlimited != null) {
+
+        formData.put("is_unlimited", this.isUnlimited);
+      }
+
+      if (this.level != null) {
+
+        formData.put("level", this.level);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LevelsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LevelsBuilder builder() {
+      return new LevelsBuilder();
+    }
+
+    public static final class LevelsBuilder {
+
+      private String name;
+
+      private String value;
+
+      private Boolean isUnlimited;
+
+      private Integer level;
+
+      private LevelsBuilder() {}
+
+      public LevelsBuilder name(String value) {
+        this.name = value;
+        return this;
+      }
+
+      public LevelsBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public LevelsBuilder isUnlimited(Boolean value) {
+        this.isUnlimited = value;
+        return this;
+      }
+
+      public LevelsBuilder level(Integer value) {
+        this.level = value;
+        return this;
+      }
+
+      public LevelsParams build() {
+        return new LevelsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureActivateResponse.java b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureActivateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/feature/FeatureActivateResponse.java
rename to src/main/java/com/chargebee/v4/models/feature/responses/FeatureActivateResponse.java
index 7f1aef90..67b4455a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureActivateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureActivateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.feature;
+package com.chargebee.v4.models.feature.responses;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.feature.Feature;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureArchiveResponse.java b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureArchiveResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/feature/FeatureArchiveResponse.java
rename to src/main/java/com/chargebee/v4/models/feature/responses/FeatureArchiveResponse.java
index 6bf46e6d..6b6e660b 100644
--- a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureArchiveResponse.java
+++ b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureArchiveResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.feature;
+package com.chargebee.v4.models.feature.responses;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.feature.Feature;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureCreateResponse.java b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/feature/FeatureCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/feature/responses/FeatureCreateResponse.java
index 448885a6..63e79399 100644
--- a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.feature;
+package com.chargebee.v4.models.feature.responses;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.feature.Feature;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureDeleteResponse.java b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/feature/FeatureDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/feature/responses/FeatureDeleteResponse.java
index 04a78ae3..fd291c94 100644
--- a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.feature;
+package com.chargebee.v4.models.feature.responses;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.feature.Feature;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureListResponse.java b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureListResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/feature/FeatureListResponse.java
rename to src/main/java/com/chargebee/v4/models/feature/responses/FeatureListResponse.java
index faca6d61..0b93136a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.feature;
+package com.chargebee.v4.models.feature.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.feature.Feature;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.FeatureService;
-import com.chargebee.v4.core.models.feature.params.FeatureListParams;
+import com.chargebee.v4.services.FeatureService;
+import com.chargebee.v4.models.feature.params.FeatureListParams;
 
 /** Immutable response object for FeatureList operation. Contains paginated list data. */
 public final class FeatureListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public FeatureListResponse nextPage() throws Exception {
+  public FeatureListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureReactivateResponse.java b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureReactivateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/feature/FeatureReactivateResponse.java
rename to src/main/java/com/chargebee/v4/models/feature/responses/FeatureReactivateResponse.java
index 847287fc..b3599ad9 100644
--- a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureReactivateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureReactivateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.feature;
+package com.chargebee.v4.models.feature.responses;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.feature.Feature;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/feature/responses/FeatureRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureRetrieveResponse.java
new file mode 100644
index 00000000..67d23900
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.feature.responses;
+
+import com.chargebee.v4.models.feature.Feature;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for FeatureRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class FeatureRetrieveResponse extends BaseResponse {
+  private final Feature feature;
+
+  private FeatureRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.feature = builder.feature;
+  }
+
+  /** Parse JSON response into FeatureRetrieveResponse object. */
+  public static FeatureRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into FeatureRetrieveResponse object with HTTP response. */
+  public static FeatureRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __featureJson = JsonUtil.getObject(json, "feature");
+      if (__featureJson != null) {
+        builder.feature(Feature.fromJson(__featureJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse FeatureRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for FeatureRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for FeatureRetrieveResponse. */
+  public static class Builder {
+
+    private Feature feature;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder feature(Feature feature) {
+      this.feature = feature;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public FeatureRetrieveResponse build() {
+      return new FeatureRetrieveResponse(this);
+    }
+  }
+
+  /** Get the feature from the response. */
+  public Feature getFeature() {
+    return feature;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureUpdateResponse.java b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/feature/FeatureUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/feature/responses/FeatureUpdateResponse.java
index 06b73aac..8350aa08 100644
--- a/src/main/java/com/chargebee/v4/core/responses/feature/FeatureUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/feature/responses/FeatureUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.feature;
+package com.chargebee.v4.models.feature.responses;
 
-import com.chargebee.v4.core.models.feature.Feature;
+import com.chargebee.v4.models.feature.Feature;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/fullExport/params/FullExportStatusParams.java b/src/main/java/com/chargebee/v4/models/fullExport/params/FullExportStatusParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/fullExport/params/FullExportStatusParams.java
rename to src/main/java/com/chargebee/v4/models/fullExport/params/FullExportStatusParams.java
index 0e9b737e..4e451af0 100644
--- a/src/main/java/com/chargebee/v4/core/models/fullExport/params/FullExportStatusParams.java
+++ b/src/main/java/com/chargebee/v4/models/fullExport/params/FullExportStatusParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.fullExport.params;
+package com.chargebee.v4.models.fullExport.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/fullExport/responses/FullExportStatusResponse.java b/src/main/java/com/chargebee/v4/models/fullExport/responses/FullExportStatusResponse.java
new file mode 100644
index 00000000..6b27039e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/fullExport/responses/FullExportStatusResponse.java
@@ -0,0 +1,72 @@
+package com.chargebee.v4.models.fullExport.responses;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for FullExportStatus operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class FullExportStatusResponse extends BaseResponse {
+  private final Object fullExport;
+
+  private FullExportStatusResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.fullExport = builder.fullExport;
+  }
+
+  /** Parse JSON response into FullExportStatusResponse object. */
+  public static FullExportStatusResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into FullExportStatusResponse object with HTTP response. */
+  public static FullExportStatusResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.fullExport(JsonUtil.getObject(json, "full_export"));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse FullExportStatusResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for FullExportStatusResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for FullExportStatusResponse. */
+  public static class Builder {
+
+    private Object fullExport;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder fullExport(Object fullExport) {
+      this.fullExport = fullExport;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public FullExportStatusResponse build() {
+      return new FullExportStatusResponse(this);
+    }
+  }
+
+  /** Get the fullExport from the response. */
+  public Object getFullExport() {
+    return fullExport;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/gatewayErrorDetail/GatewayErrorDetail.java b/src/main/java/com/chargebee/v4/models/gatewayErrorDetail/GatewayErrorDetail.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/gatewayErrorDetail/GatewayErrorDetail.java
rename to src/main/java/com/chargebee/v4/models/gatewayErrorDetail/GatewayErrorDetail.java
index bfb2f77d..276ee194 100644
--- a/src/main/java/com/chargebee/v4/core/models/gatewayErrorDetail/GatewayErrorDetail.java
+++ b/src/main/java/com/chargebee/v4/models/gatewayErrorDetail/GatewayErrorDetail.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.gatewayErrorDetail;
+package com.chargebee.v4.models.gatewayErrorDetail;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/gift/Gift.java b/src/main/java/com/chargebee/v4/models/gift/Gift.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/gift/Gift.java
rename to src/main/java/com/chargebee/v4/models/gift/Gift.java
index e9ea9c11..9e32fa4b 100644
--- a/src/main/java/com/chargebee/v4/core/models/gift/Gift.java
+++ b/src/main/java/com/chargebee/v4/models/gift/Gift.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.gift;
+package com.chargebee.v4.models.gift;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/gift/params/GiftCancelParams.java b/src/main/java/com/chargebee/v4/models/gift/params/GiftCancelParams.java
new file mode 100644
index 00000000..07894bde
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/gift/params/GiftCancelParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.gift.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class GiftCancelParams {
+
+  private GiftCancelParams(GiftCancelBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for GiftCancelParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static GiftCancelBuilder builder() {
+    return new GiftCancelBuilder();
+  }
+
+  public static final class GiftCancelBuilder {
+
+    private GiftCancelBuilder() {}
+
+    public GiftCancelParams build() {
+      return new GiftCancelParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/gift/params/GiftClaimParams.java b/src/main/java/com/chargebee/v4/models/gift/params/GiftClaimParams.java
new file mode 100644
index 00000000..40be4041
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/gift/params/GiftClaimParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.gift.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class GiftClaimParams {
+
+  private GiftClaimParams(GiftClaimBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for GiftClaimParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static GiftClaimBuilder builder() {
+    return new GiftClaimBuilder();
+  }
+
+  public static final class GiftClaimBuilder {
+
+    private GiftClaimBuilder() {}
+
+    public GiftClaimParams build() {
+      return new GiftClaimParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/gift/params/GiftCreateForItemsParams.java b/src/main/java/com/chargebee/v4/models/gift/params/GiftCreateForItemsParams.java
new file mode 100644
index 00000000..be7fc109
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/gift/params/GiftCreateForItemsParams.java
@@ -0,0 +1,1422 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.gift.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class GiftCreateForItemsParams {
+
+  private final Timestamp scheduledAt;
+
+  private final Boolean autoClaim;
+
+  private final Boolean noExpiry;
+
+  private final Timestamp claimExpiryDate;
+
+  private final List<String> couponIds;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final GifterParams gifter;
+
+  private final GiftReceiverParams giftReceiver;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private GiftCreateForItemsParams(GiftCreateForItemsBuilder builder) {
+
+    this.scheduledAt = builder.scheduledAt;
+
+    this.autoClaim = builder.autoClaim;
+
+    this.noExpiry = builder.noExpiry;
+
+    this.claimExpiryDate = builder.claimExpiryDate;
+
+    this.couponIds = builder.couponIds;
+
+    this.metaData = builder.metaData;
+
+    this.gifter = builder.gifter;
+
+    this.giftReceiver = builder.giftReceiver;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.itemTiers = builder.itemTiers;
+  }
+
+  public Timestamp getScheduledAt() {
+    return scheduledAt;
+  }
+
+  public Boolean getAutoClaim() {
+    return autoClaim;
+  }
+
+  public Boolean getNoExpiry() {
+    return noExpiry;
+  }
+
+  public Timestamp getClaimExpiryDate() {
+    return claimExpiryDate;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public GifterParams getGifter() {
+    return gifter;
+  }
+
+  public GiftReceiverParams getGiftReceiver() {
+    return giftReceiver;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.scheduledAt != null) {
+
+      formData.put("scheduled_at", this.scheduledAt);
+    }
+
+    if (this.autoClaim != null) {
+
+      formData.put("auto_claim", this.autoClaim);
+    }
+
+    if (this.noExpiry != null) {
+
+      formData.put("no_expiry", this.noExpiry);
+    }
+
+    if (this.claimExpiryDate != null) {
+
+      formData.put("claim_expiry_date", this.claimExpiryDate);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.gifter != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.gifter.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "gifter[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.giftReceiver != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.giftReceiver.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "gift_receiver[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for GiftCreateForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static GiftCreateForItemsBuilder builder() {
+    return new GiftCreateForItemsBuilder();
+  }
+
+  public static final class GiftCreateForItemsBuilder {
+
+    private Timestamp scheduledAt;
+
+    private Boolean autoClaim;
+
+    private Boolean noExpiry;
+
+    private Timestamp claimExpiryDate;
+
+    private List<String> couponIds;
+
+    private java.util.Map<String, Object> metaData;
+
+    private GifterParams gifter;
+
+    private GiftReceiverParams giftReceiver;
+
+    private PaymentIntentParams paymentIntent;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private GiftCreateForItemsBuilder() {}
+
+    public GiftCreateForItemsBuilder scheduledAt(Timestamp value) {
+      this.scheduledAt = value;
+      return this;
+    }
+
+    public GiftCreateForItemsBuilder autoClaim(Boolean value) {
+      this.autoClaim = value;
+      return this;
+    }
+
+    public GiftCreateForItemsBuilder noExpiry(Boolean value) {
+      this.noExpiry = value;
+      return this;
+    }
+
+    public GiftCreateForItemsBuilder claimExpiryDate(Timestamp value) {
+      this.claimExpiryDate = value;
+      return this;
+    }
+
+    public GiftCreateForItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public GiftCreateForItemsBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public GiftCreateForItemsBuilder gifter(GifterParams value) {
+      this.gifter = value;
+      return this;
+    }
+
+    public GiftCreateForItemsBuilder giftReceiver(GiftReceiverParams value) {
+      this.giftReceiver = value;
+      return this;
+    }
+
+    public GiftCreateForItemsBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public GiftCreateForItemsBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public GiftCreateForItemsBuilder subscriptionItems(List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public GiftCreateForItemsBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public GiftCreateForItemsParams build() {
+      return new GiftCreateForItemsParams(this);
+    }
+  }
+
+  public static final class GifterParams {
+
+    private final String customerId;
+
+    private final String signature;
+
+    private final String note;
+
+    private final String paymentSrcId;
+
+    private GifterParams(GifterBuilder builder) {
+
+      this.customerId = builder.customerId;
+
+      this.signature = builder.signature;
+
+      this.note = builder.note;
+
+      this.paymentSrcId = builder.paymentSrcId;
+    }
+
+    public String getCustomerId() {
+      return customerId;
+    }
+
+    public String getSignature() {
+      return signature;
+    }
+
+    public String getNote() {
+      return note;
+    }
+
+    public String getPaymentSrcId() {
+      return paymentSrcId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.customerId != null) {
+
+        formData.put("customer_id", this.customerId);
+      }
+
+      if (this.signature != null) {
+
+        formData.put("signature", this.signature);
+      }
+
+      if (this.note != null) {
+
+        formData.put("note", this.note);
+      }
+
+      if (this.paymentSrcId != null) {
+
+        formData.put("payment_src_id", this.paymentSrcId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GifterParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GifterBuilder builder() {
+      return new GifterBuilder();
+    }
+
+    public static final class GifterBuilder {
+
+      private String customerId;
+
+      private String signature;
+
+      private String note;
+
+      private String paymentSrcId;
+
+      private GifterBuilder() {}
+
+      public GifterBuilder customerId(String value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public GifterBuilder signature(String value) {
+        this.signature = value;
+        return this;
+      }
+
+      public GifterBuilder note(String value) {
+        this.note = value;
+        return this;
+      }
+
+      public GifterBuilder paymentSrcId(String value) {
+        this.paymentSrcId = value;
+        return this;
+      }
+
+      public GifterParams build() {
+        return new GifterParams(this);
+      }
+    }
+  }
+
+  public static final class GiftReceiverParams {
+
+    private final String customerId;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private GiftReceiverParams(GiftReceiverBuilder builder) {
+
+      this.customerId = builder.customerId;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+    }
+
+    public String getCustomerId() {
+      return customerId;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.customerId != null) {
+
+        formData.put("customer_id", this.customerId);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GiftReceiverParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GiftReceiverBuilder builder() {
+      return new GiftReceiverBuilder();
+    }
+
+    public static final class GiftReceiverBuilder {
+
+      private String customerId;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private GiftReceiverBuilder() {}
+
+      public GiftReceiverBuilder customerId(String value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public GiftReceiverBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public GiftReceiverBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public GiftReceiverBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public GiftReceiverParams build() {
+        return new GiftReceiverParams(this);
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/gift/params/GiftCreateParams.java b/src/main/java/com/chargebee/v4/models/gift/params/GiftCreateParams.java
new file mode 100644
index 00000000..427fc417
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/gift/params/GiftCreateParams.java
@@ -0,0 +1,1277 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.gift.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class GiftCreateParams {
+
+  private final Timestamp scheduledAt;
+
+  private final Boolean autoClaim;
+
+  private final Boolean noExpiry;
+
+  private final Timestamp claimExpiryDate;
+
+  private final List<String> couponIds;
+
+  private final GifterParams gifter;
+
+  private final GiftReceiverParams giftReceiver;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final SubscriptionParams subscription;
+
+  private final List<AddonsParams> addons;
+
+  private GiftCreateParams(GiftCreateBuilder builder) {
+
+    this.scheduledAt = builder.scheduledAt;
+
+    this.autoClaim = builder.autoClaim;
+
+    this.noExpiry = builder.noExpiry;
+
+    this.claimExpiryDate = builder.claimExpiryDate;
+
+    this.couponIds = builder.couponIds;
+
+    this.gifter = builder.gifter;
+
+    this.giftReceiver = builder.giftReceiver;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.subscription = builder.subscription;
+
+    this.addons = builder.addons;
+  }
+
+  public Timestamp getScheduledAt() {
+    return scheduledAt;
+  }
+
+  public Boolean getAutoClaim() {
+    return autoClaim;
+  }
+
+  public Boolean getNoExpiry() {
+    return noExpiry;
+  }
+
+  public Timestamp getClaimExpiryDate() {
+    return claimExpiryDate;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public GifterParams getGifter() {
+    return gifter;
+  }
+
+  public GiftReceiverParams getGiftReceiver() {
+    return giftReceiver;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.scheduledAt != null) {
+
+      formData.put("scheduled_at", this.scheduledAt);
+    }
+
+    if (this.autoClaim != null) {
+
+      formData.put("auto_claim", this.autoClaim);
+    }
+
+    if (this.noExpiry != null) {
+
+      formData.put("no_expiry", this.noExpiry);
+    }
+
+    if (this.claimExpiryDate != null) {
+
+      formData.put("claim_expiry_date", this.claimExpiryDate);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.gifter != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.gifter.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "gifter[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.giftReceiver != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.giftReceiver.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "gift_receiver[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for GiftCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static GiftCreateBuilder builder() {
+    return new GiftCreateBuilder();
+  }
+
+  public static final class GiftCreateBuilder {
+
+    private Timestamp scheduledAt;
+
+    private Boolean autoClaim;
+
+    private Boolean noExpiry;
+
+    private Timestamp claimExpiryDate;
+
+    private List<String> couponIds;
+
+    private GifterParams gifter;
+
+    private GiftReceiverParams giftReceiver;
+
+    private PaymentIntentParams paymentIntent;
+
+    private ShippingAddressParams shippingAddress;
+
+    private SubscriptionParams subscription;
+
+    private List<AddonsParams> addons;
+
+    private GiftCreateBuilder() {}
+
+    public GiftCreateBuilder scheduledAt(Timestamp value) {
+      this.scheduledAt = value;
+      return this;
+    }
+
+    public GiftCreateBuilder autoClaim(Boolean value) {
+      this.autoClaim = value;
+      return this;
+    }
+
+    public GiftCreateBuilder noExpiry(Boolean value) {
+      this.noExpiry = value;
+      return this;
+    }
+
+    public GiftCreateBuilder claimExpiryDate(Timestamp value) {
+      this.claimExpiryDate = value;
+      return this;
+    }
+
+    public GiftCreateBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public GiftCreateBuilder gifter(GifterParams value) {
+      this.gifter = value;
+      return this;
+    }
+
+    public GiftCreateBuilder giftReceiver(GiftReceiverParams value) {
+      this.giftReceiver = value;
+      return this;
+    }
+
+    public GiftCreateBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public GiftCreateBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public GiftCreateBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public GiftCreateBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public GiftCreateParams build() {
+      return new GiftCreateParams(this);
+    }
+  }
+
+  public static final class GifterParams {
+
+    private final String customerId;
+
+    private final String signature;
+
+    private final String note;
+
+    private final String paymentSrcId;
+
+    private GifterParams(GifterBuilder builder) {
+
+      this.customerId = builder.customerId;
+
+      this.signature = builder.signature;
+
+      this.note = builder.note;
+
+      this.paymentSrcId = builder.paymentSrcId;
+    }
+
+    public String getCustomerId() {
+      return customerId;
+    }
+
+    public String getSignature() {
+      return signature;
+    }
+
+    public String getNote() {
+      return note;
+    }
+
+    public String getPaymentSrcId() {
+      return paymentSrcId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.customerId != null) {
+
+        formData.put("customer_id", this.customerId);
+      }
+
+      if (this.signature != null) {
+
+        formData.put("signature", this.signature);
+      }
+
+      if (this.note != null) {
+
+        formData.put("note", this.note);
+      }
+
+      if (this.paymentSrcId != null) {
+
+        formData.put("payment_src_id", this.paymentSrcId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GifterParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GifterBuilder builder() {
+      return new GifterBuilder();
+    }
+
+    public static final class GifterBuilder {
+
+      private String customerId;
+
+      private String signature;
+
+      private String note;
+
+      private String paymentSrcId;
+
+      private GifterBuilder() {}
+
+      public GifterBuilder customerId(String value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public GifterBuilder signature(String value) {
+        this.signature = value;
+        return this;
+      }
+
+      public GifterBuilder note(String value) {
+        this.note = value;
+        return this;
+      }
+
+      public GifterBuilder paymentSrcId(String value) {
+        this.paymentSrcId = value;
+        return this;
+      }
+
+      public GifterParams build() {
+        return new GifterParams(this);
+      }
+    }
+  }
+
+  public static final class GiftReceiverParams {
+
+    private final String customerId;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private GiftReceiverParams(GiftReceiverBuilder builder) {
+
+      this.customerId = builder.customerId;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+    }
+
+    public String getCustomerId() {
+      return customerId;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.customerId != null) {
+
+        formData.put("customer_id", this.customerId);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GiftReceiverParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GiftReceiverBuilder builder() {
+      return new GiftReceiverBuilder();
+    }
+
+    public static final class GiftReceiverBuilder {
+
+      private String customerId;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private GiftReceiverBuilder() {}
+
+      public GiftReceiverBuilder customerId(String value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public GiftReceiverBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public GiftReceiverBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public GiftReceiverBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public GiftReceiverParams build() {
+        return new GiftReceiverParams(this);
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String planId;
+
+    private final Integer planQuantity;
+
+    private final String planQuantityInDecimal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.planId = builder.planId;
+
+      this.planQuantity = builder.planQuantity;
+
+      this.planQuantityInDecimal = builder.planQuantityInDecimal;
+    }
+
+    public String getPlanId() {
+      return planId;
+    }
+
+    public Integer getPlanQuantity() {
+      return planQuantity;
+    }
+
+    public String getPlanQuantityInDecimal() {
+      return planQuantityInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.planId != null) {
+
+        formData.put("plan_id", this.planId);
+      }
+
+      if (this.planQuantity != null) {
+
+        formData.put("plan_quantity", this.planQuantity);
+      }
+
+      if (this.planQuantityInDecimal != null) {
+
+        formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String planId;
+
+      private Integer planQuantity;
+
+      private String planQuantityInDecimal;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder planId(String value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantity(Integer value) {
+        this.planQuantity = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantityInDecimal(String value) {
+        this.planQuantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftListParams.java b/src/main/java/com/chargebee/v4/models/gift/params/GiftListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/gift/params/GiftListParams.java
rename to src/main/java/com/chargebee/v4/models/gift/params/GiftListParams.java
index 217b7898..a4452175 100644
--- a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftListParams.java
+++ b/src/main/java/com/chargebee/v4/models/gift/params/GiftListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.gift.params;
+package com.chargebee.v4.models.gift.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftRetrieveParams.java b/src/main/java/com/chargebee/v4/models/gift/params/GiftRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/gift/params/GiftRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/gift/params/GiftRetrieveParams.java
index 7f3b6c2c..d9fb6f75 100644
--- a/src/main/java/com/chargebee/v4/core/models/gift/params/GiftRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/gift/params/GiftRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.gift.params;
+package com.chargebee.v4.models.gift.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/gift/params/UpdateGiftParams.java b/src/main/java/com/chargebee/v4/models/gift/params/UpdateGiftParams.java
new file mode 100644
index 00000000..93715faf
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/gift/params/UpdateGiftParams.java
@@ -0,0 +1,81 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.gift.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class UpdateGiftParams {
+
+  private final Timestamp scheduledAt;
+
+  private final String comment;
+
+  private UpdateGiftParams(UpdateGiftBuilder builder) {
+
+    this.scheduledAt = builder.scheduledAt;
+
+    this.comment = builder.comment;
+  }
+
+  public Timestamp getScheduledAt() {
+    return scheduledAt;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.scheduledAt != null) {
+
+      formData.put("scheduled_at", this.scheduledAt);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for UpdateGiftParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UpdateGiftBuilder builder() {
+    return new UpdateGiftBuilder();
+  }
+
+  public static final class UpdateGiftBuilder {
+
+    private Timestamp scheduledAt;
+
+    private String comment;
+
+    private UpdateGiftBuilder() {}
+
+    public UpdateGiftBuilder scheduledAt(Timestamp value) {
+      this.scheduledAt = value;
+      return this;
+    }
+
+    public UpdateGiftBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public UpdateGiftParams build() {
+      return new UpdateGiftParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/gift/GiftCancelResponse.java b/src/main/java/com/chargebee/v4/models/gift/responses/GiftCancelResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/gift/GiftCancelResponse.java
rename to src/main/java/com/chargebee/v4/models/gift/responses/GiftCancelResponse.java
index bba324fe..da96e8f0 100644
--- a/src/main/java/com/chargebee/v4/core/responses/gift/GiftCancelResponse.java
+++ b/src/main/java/com/chargebee/v4/models/gift/responses/GiftCancelResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.gift;
+package com.chargebee.v4.models.gift.responses;
 
-import com.chargebee.v4.core.models.gift.Gift;
+import com.chargebee.v4.models.gift.Gift;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/gift/GiftClaimResponse.java b/src/main/java/com/chargebee/v4/models/gift/responses/GiftClaimResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/gift/GiftClaimResponse.java
rename to src/main/java/com/chargebee/v4/models/gift/responses/GiftClaimResponse.java
index 152f028c..9d48cbeb 100644
--- a/src/main/java/com/chargebee/v4/core/responses/gift/GiftClaimResponse.java
+++ b/src/main/java/com/chargebee/v4/models/gift/responses/GiftClaimResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.gift;
+package com.chargebee.v4.models.gift.responses;
 
-import com.chargebee.v4.core.models.gift.Gift;
+import com.chargebee.v4.models.gift.Gift;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/gift/GiftCreateForItemsResponse.java b/src/main/java/com/chargebee/v4/models/gift/responses/GiftCreateForItemsResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/gift/GiftCreateForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/gift/responses/GiftCreateForItemsResponse.java
index 866969fd..e2462ee6 100644
--- a/src/main/java/com/chargebee/v4/core/responses/gift/GiftCreateForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/gift/responses/GiftCreateForItemsResponse.java
@@ -1,12 +1,12 @@
-package com.chargebee.v4.core.responses.gift;
+package com.chargebee.v4.models.gift.responses;
 
-import com.chargebee.v4.core.models.gift.Gift;
+import com.chargebee.v4.models.gift.Gift;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/gift/GiftCreateResponse.java b/src/main/java/com/chargebee/v4/models/gift/responses/GiftCreateResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/gift/GiftCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/gift/responses/GiftCreateResponse.java
index a4988033..40958573 100644
--- a/src/main/java/com/chargebee/v4/core/responses/gift/GiftCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/gift/responses/GiftCreateResponse.java
@@ -1,12 +1,12 @@
-package com.chargebee.v4.core.responses.gift;
+package com.chargebee.v4.models.gift.responses;
 
-import com.chargebee.v4.core.models.gift.Gift;
+import com.chargebee.v4.models.gift.Gift;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/gift/GiftListResponse.java b/src/main/java/com/chargebee/v4/models/gift/responses/GiftListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/gift/GiftListResponse.java
rename to src/main/java/com/chargebee/v4/models/gift/responses/GiftListResponse.java
index 42184e9f..c02e7b61 100644
--- a/src/main/java/com/chargebee/v4/core/responses/gift/GiftListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/gift/responses/GiftListResponse.java
@@ -1,15 +1,16 @@
-package com.chargebee.v4.core.responses.gift;
+package com.chargebee.v4.models.gift.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.gift.Gift;
+import com.chargebee.v4.models.gift.Gift;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.GiftService;
-import com.chargebee.v4.core.models.gift.params.GiftListParams;
+import com.chargebee.v4.services.GiftService;
+import com.chargebee.v4.models.gift.params.GiftListParams;
 
 /** Immutable response object for GiftList operation. Contains paginated list data. */
 public final class GiftListResponse {
@@ -97,9 +98,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public GiftListResponse nextPage() throws Exception {
+  public GiftListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/gift/responses/GiftRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/gift/responses/GiftRetrieveResponse.java
new file mode 100644
index 00000000..d3be4f43
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/gift/responses/GiftRetrieveResponse.java
@@ -0,0 +1,100 @@
+package com.chargebee.v4.models.gift.responses;
+
+import com.chargebee.v4.models.gift.Gift;
+
+import com.chargebee.v4.models.subscription.Subscription;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for GiftRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class GiftRetrieveResponse extends BaseResponse {
+  private final Gift gift;
+
+  private final Subscription subscription;
+
+  private GiftRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.gift = builder.gift;
+
+    this.subscription = builder.subscription;
+  }
+
+  /** Parse JSON response into GiftRetrieveResponse object. */
+  public static GiftRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into GiftRetrieveResponse object with HTTP response. */
+  public static GiftRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __giftJson = JsonUtil.getObject(json, "gift");
+      if (__giftJson != null) {
+        builder.gift(Gift.fromJson(__giftJson));
+      }
+
+      String __subscriptionJson = JsonUtil.getObject(json, "subscription");
+      if (__subscriptionJson != null) {
+        builder.subscription(Subscription.fromJson(__subscriptionJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse GiftRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for GiftRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for GiftRetrieveResponse. */
+  public static class Builder {
+
+    private Gift gift;
+
+    private Subscription subscription;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder gift(Gift gift) {
+      this.gift = gift;
+      return this;
+    }
+
+    public Builder subscription(Subscription subscription) {
+      this.subscription = subscription;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public GiftRetrieveResponse build() {
+      return new GiftRetrieveResponse(this);
+    }
+  }
+
+  /** Get the gift from the response. */
+  public Gift getGift() {
+    return gift;
+  }
+
+  /** Get the subscription from the response. */
+  public Subscription getSubscription() {
+    return subscription;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/gift/responses/UpdateGiftResponse.java b/src/main/java/com/chargebee/v4/models/gift/responses/UpdateGiftResponse.java
new file mode 100644
index 00000000..b9e5b92e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/gift/responses/UpdateGiftResponse.java
@@ -0,0 +1,97 @@
+package com.chargebee.v4.models.gift.responses;
+
+import com.chargebee.v4.models.gift.Gift;
+
+import com.chargebee.v4.models.subscription.Subscription;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/** Immutable response object for UpdateGift operation. Contains the response data from the API. */
+public final class UpdateGiftResponse extends BaseResponse {
+  private final Gift gift;
+
+  private final Subscription subscription;
+
+  private UpdateGiftResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.gift = builder.gift;
+
+    this.subscription = builder.subscription;
+  }
+
+  /** Parse JSON response into UpdateGiftResponse object. */
+  public static UpdateGiftResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into UpdateGiftResponse object with HTTP response. */
+  public static UpdateGiftResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __giftJson = JsonUtil.getObject(json, "gift");
+      if (__giftJson != null) {
+        builder.gift(Gift.fromJson(__giftJson));
+      }
+
+      String __subscriptionJson = JsonUtil.getObject(json, "subscription");
+      if (__subscriptionJson != null) {
+        builder.subscription(Subscription.fromJson(__subscriptionJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse UpdateGiftResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for UpdateGiftResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for UpdateGiftResponse. */
+  public static class Builder {
+
+    private Gift gift;
+
+    private Subscription subscription;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder gift(Gift gift) {
+      this.gift = gift;
+      return this;
+    }
+
+    public Builder subscription(Subscription subscription) {
+      this.subscription = subscription;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public UpdateGiftResponse build() {
+      return new UpdateGiftResponse(this);
+    }
+  }
+
+  /** Get the gift from the response. */
+  public Gift getGift() {
+    return gift;
+  }
+
+  /** Get the subscription from the response. */
+  public Subscription getSubscription() {
+    return subscription;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/hierarchy/Hierarchy.java b/src/main/java/com/chargebee/v4/models/hierarchy/Hierarchy.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/hierarchy/Hierarchy.java
rename to src/main/java/com/chargebee/v4/models/hierarchy/Hierarchy.java
index c4105915..e4398b47 100644
--- a/src/main/java/com/chargebee/v4/core/models/hierarchy/Hierarchy.java
+++ b/src/main/java/com/chargebee/v4/models/hierarchy/Hierarchy.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.hierarchy;
+package com.chargebee.v4.models.hierarchy;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.util.List;
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/HostedPage.java b/src/main/java/com/chargebee/v4/models/hostedPage/HostedPage.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/hostedPage/HostedPage.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/HostedPage.java
index f2635c86..e1008152 100644
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/HostedPage.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/HostedPage.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.hostedPage;
+package com.chargebee.v4.models.hostedPage;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageAcceptQuoteParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageAcceptQuoteParams.java
new file mode 100644
index 00000000..2db144dc
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageAcceptQuoteParams.java
@@ -0,0 +1,181 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class HostedPageAcceptQuoteParams {
+
+  private final String redirectUrl;
+
+  private final Layout layout;
+
+  private final QuoteParams quote;
+
+  private HostedPageAcceptQuoteParams(HostedPageAcceptQuoteBuilder builder) {
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.layout = builder.layout;
+
+    this.quote = builder.quote;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public Layout getLayout() {
+    return layout;
+  }
+
+  public QuoteParams getQuote() {
+    return quote;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.layout != null) {
+
+      formData.put("layout", this.layout);
+    }
+
+    if (this.quote != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.quote.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "quote[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageAcceptQuoteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageAcceptQuoteBuilder builder() {
+    return new HostedPageAcceptQuoteBuilder();
+  }
+
+  public static final class HostedPageAcceptQuoteBuilder {
+
+    private String redirectUrl;
+
+    private Layout layout;
+
+    private QuoteParams quote;
+
+    private HostedPageAcceptQuoteBuilder() {}
+
+    public HostedPageAcceptQuoteBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageAcceptQuoteBuilder layout(Layout value) {
+      this.layout = value;
+      return this;
+    }
+
+    public HostedPageAcceptQuoteBuilder quote(QuoteParams value) {
+      this.quote = value;
+      return this;
+    }
+
+    public HostedPageAcceptQuoteParams build() {
+      return new HostedPageAcceptQuoteParams(this);
+    }
+  }
+
+  public enum Layout {
+    IN_APP("in_app"),
+
+    FULL_PAGE("full_page"),
+
+    /** An enum member indicating that Layout was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Layout(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Layout fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Layout enumValue : Layout.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class QuoteParams {
+
+    private final String id;
+
+    private QuoteParams(QuoteBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for QuoteParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static QuoteBuilder builder() {
+      return new QuoteBuilder();
+    }
+
+    public static final class QuoteBuilder {
+
+      private String id;
+
+      private QuoteBuilder() {}
+
+      public QuoteBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public QuoteParams build() {
+        return new QuoteParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageAcknowledgeParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageAcknowledgeParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageAcknowledgeParams.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageAcknowledgeParams.java
index 9c788c9f..f665d1f4 100644
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageAcknowledgeParams.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageAcknowledgeParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.hostedPage.params;
+package com.chargebee.v4.models.hostedPage.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class HostedPageAcknowledgeParams {
 
-  private final Map<String, Object> formData;
-
-  private HostedPageAcknowledgeParams(HostedPageAcknowledgeBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private HostedPageAcknowledgeParams(HostedPageAcknowledgeBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static HostedPageAcknowledgeBuilder builder() {
   }
 
   public static final class HostedPageAcknowledgeBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private HostedPageAcknowledgeBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutExistingForItemsParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutExistingForItemsParams.java
new file mode 100644
index 00000000..8f7fba70
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutExistingForItemsParams.java
@@ -0,0 +1,2556 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class HostedPageCheckoutExistingForItemsParams {
+
+  private final Layout layout;
+
+  private final List<String> mandatoryItemsToRemove;
+
+  private final Boolean replaceItemsList;
+
+  private final Timestamp invoiceDate;
+
+  private final Integer billingCycles;
+
+  private final Integer termsToCharge;
+
+  private final Timestamp reactivateFrom;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final Boolean replaceCouponList;
+
+  private final Boolean reactivate;
+
+  private final Boolean forceTermReset;
+
+  private final ChangeOption changeOption;
+
+  private final Timestamp changesScheduledAt;
+
+  private final String redirectUrl;
+
+  private final String cancelUrl;
+
+  private final String passThruContent;
+
+  private final Boolean allowOfflinePaymentMethods;
+
+  private final SubscriptionParams subscription;
+
+  private final CustomerParams customer;
+
+  private final CardParams card;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<EntityIdentifiersParams> entityIdentifiers;
+
+  private HostedPageCheckoutExistingForItemsParams(
+      HostedPageCheckoutExistingForItemsBuilder builder) {
+
+    this.layout = builder.layout;
+
+    this.mandatoryItemsToRemove = builder.mandatoryItemsToRemove;
+
+    this.replaceItemsList = builder.replaceItemsList;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.reactivateFrom = builder.reactivateFrom;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.replaceCouponList = builder.replaceCouponList;
+
+    this.reactivate = builder.reactivate;
+
+    this.forceTermReset = builder.forceTermReset;
+
+    this.changeOption = builder.changeOption;
+
+    this.changesScheduledAt = builder.changesScheduledAt;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.cancelUrl = builder.cancelUrl;
+
+    this.passThruContent = builder.passThruContent;
+
+    this.allowOfflinePaymentMethods = builder.allowOfflinePaymentMethods;
+
+    this.subscription = builder.subscription;
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.discounts = builder.discounts;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.entityIdentifiers = builder.entityIdentifiers;
+  }
+
+  public Layout getLayout() {
+    return layout;
+  }
+
+  public List<String> getMandatoryItemsToRemove() {
+    return mandatoryItemsToRemove;
+  }
+
+  public Boolean getReplaceItemsList() {
+    return replaceItemsList;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public Timestamp getReactivateFrom() {
+    return reactivateFrom;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public Boolean getReplaceCouponList() {
+    return replaceCouponList;
+  }
+
+  public Boolean getReactivate() {
+    return reactivate;
+  }
+
+  public Boolean getForceTermReset() {
+    return forceTermReset;
+  }
+
+  public ChangeOption getChangeOption() {
+    return changeOption;
+  }
+
+  public Timestamp getChangesScheduledAt() {
+    return changesScheduledAt;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public String getCancelUrl() {
+    return cancelUrl;
+  }
+
+  public String getPassThruContent() {
+    return passThruContent;
+  }
+
+  public Boolean getAllowOfflinePaymentMethods() {
+    return allowOfflinePaymentMethods;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<EntityIdentifiersParams> getEntityIdentifiers() {
+    return entityIdentifiers;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.layout != null) {
+
+      formData.put("layout", this.layout);
+    }
+
+    if (this.mandatoryItemsToRemove != null) {
+
+      formData.put("mandatory_items_to_remove", this.mandatoryItemsToRemove);
+    }
+
+    if (this.replaceItemsList != null) {
+
+      formData.put("replace_items_list", this.replaceItemsList);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.reactivateFrom != null) {
+
+      formData.put("reactivate_from", this.reactivateFrom);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.replaceCouponList != null) {
+
+      formData.put("replace_coupon_list", this.replaceCouponList);
+    }
+
+    if (this.reactivate != null) {
+
+      formData.put("reactivate", this.reactivate);
+    }
+
+    if (this.forceTermReset != null) {
+
+      formData.put("force_term_reset", this.forceTermReset);
+    }
+
+    if (this.changeOption != null) {
+
+      formData.put("change_option", this.changeOption);
+    }
+
+    if (this.changesScheduledAt != null) {
+
+      formData.put("changes_scheduled_at", this.changesScheduledAt);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.cancelUrl != null) {
+
+      formData.put("cancel_url", this.cancelUrl);
+    }
+
+    if (this.passThruContent != null) {
+
+      formData.put("pass_thru_content", this.passThruContent);
+    }
+
+    if (this.allowOfflinePaymentMethods != null) {
+
+      formData.put("allow_offline_payment_methods", this.allowOfflinePaymentMethods);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.entityIdentifiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.entityIdentifiers.size(); i++) {
+        EntityIdentifiersParams item = this.entityIdentifiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "entity_identifiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageCheckoutExistingForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageCheckoutExistingForItemsBuilder builder() {
+    return new HostedPageCheckoutExistingForItemsBuilder();
+  }
+
+  public static final class HostedPageCheckoutExistingForItemsBuilder {
+
+    private Layout layout;
+
+    private List<String> mandatoryItemsToRemove;
+
+    private Boolean replaceItemsList;
+
+    private Timestamp invoiceDate;
+
+    private Integer billingCycles;
+
+    private Integer termsToCharge;
+
+    private Timestamp reactivateFrom;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private Boolean replaceCouponList;
+
+    private Boolean reactivate;
+
+    private Boolean forceTermReset;
+
+    private ChangeOption changeOption;
+
+    private Timestamp changesScheduledAt;
+
+    private String redirectUrl;
+
+    private String cancelUrl;
+
+    private String passThruContent;
+
+    private Boolean allowOfflinePaymentMethods;
+
+    private SubscriptionParams subscription;
+
+    private CustomerParams customer;
+
+    private CardParams card;
+
+    private ContractTermParams contractTerm;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<DiscountsParams> discounts;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<EntityIdentifiersParams> entityIdentifiers;
+
+    private HostedPageCheckoutExistingForItemsBuilder() {}
+
+    public HostedPageCheckoutExistingForItemsBuilder layout(Layout value) {
+      this.layout = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder mandatoryItemsToRemove(List<String> value) {
+      this.mandatoryItemsToRemove = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder replaceItemsList(Boolean value) {
+      this.replaceItemsList = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder reactivateFrom(Timestamp value) {
+      this.reactivateFrom = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder billingAlignmentMode(
+        BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder replaceCouponList(Boolean value) {
+      this.replaceCouponList = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder reactivate(Boolean value) {
+      this.reactivate = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder forceTermReset(Boolean value) {
+      this.forceTermReset = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder changeOption(ChangeOption value) {
+      this.changeOption = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder changesScheduledAt(Timestamp value) {
+      this.changesScheduledAt = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder cancelUrl(String value) {
+      this.cancelUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder passThruContent(String value) {
+      this.passThruContent = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder allowOfflinePaymentMethods(Boolean value) {
+      this.allowOfflinePaymentMethods = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsBuilder entityIdentifiers(
+        List<EntityIdentifiersParams> value) {
+      this.entityIdentifiers = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingForItemsParams build() {
+      return new HostedPageCheckoutExistingForItemsParams(this);
+    }
+  }
+
+  public enum Layout {
+    IN_APP("in_app"),
+
+    FULL_PAGE("full_page"),
+
+    /** An enum member indicating that Layout was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Layout(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Layout fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Layout enumValue : Layout.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChangeOption {
+    IMMEDIATELY("immediately"),
+
+    END_OF_TERM("end_of_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChangeOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChangeOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChangeOption enumValue : ChangeOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final Long setupFee;
+
+    private final Timestamp startDate;
+
+    private final Timestamp trialEnd;
+
+    private final String coupon;
+
+    private final AutoCollection autoCollection;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final String invoiceNotes;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.setupFee = builder.setupFee;
+
+      this.startDate = builder.startDate;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.coupon = builder.coupon;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.invoiceNotes = builder.invoiceNotes;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public String getCoupon() {
+      return coupon;
+    }
+
+    public AutoCollection getAutoCollection() {
+      return autoCollection;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public String getInvoiceNotes() {
+      return invoiceNotes;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.coupon != null) {
+
+        formData.put("coupon", this.coupon);
+      }
+
+      if (this.autoCollection != null) {
+
+        formData.put("auto_collection", this.autoCollection);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.invoiceNotes != null) {
+
+        formData.put("invoice_notes", this.invoiceNotes);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private Long setupFee;
+
+      private Timestamp startDate;
+
+      private Timestamp trialEnd;
+
+      private String coupon;
+
+      private AutoCollection autoCollection;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private String invoiceNotes;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder coupon(String value) {
+        this.coupon = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCollection(AutoCollection value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder invoiceNotes(String value) {
+        this.invoiceNotes = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum AutoCollection {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AutoCollection(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AutoCollection fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AutoCollection enumValue : AutoCollection.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final Boolean isEinvoiceEnabled;
+
+    private final String entityIdentifierScheme;
+
+    private final String entityIdentifierStandard;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.isEinvoiceEnabled = builder.isEinvoiceEnabled;
+
+      this.entityIdentifierScheme = builder.entityIdentifierScheme;
+
+      this.entityIdentifierStandard = builder.entityIdentifierStandard;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public Boolean getIsEinvoiceEnabled() {
+      return isEinvoiceEnabled;
+    }
+
+    public String getEntityIdentifierScheme() {
+      return entityIdentifierScheme;
+    }
+
+    public String getEntityIdentifierStandard() {
+      return entityIdentifierStandard;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.isEinvoiceEnabled != null) {
+
+        formData.put("is_einvoice_enabled", this.isEinvoiceEnabled);
+      }
+
+      if (this.entityIdentifierScheme != null) {
+
+        formData.put("entity_identifier_scheme", this.entityIdentifierScheme);
+      }
+
+      if (this.entityIdentifierStandard != null) {
+
+        formData.put("entity_identifier_standard", this.entityIdentifierStandard);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private Boolean isEinvoiceEnabled;
+
+      private String entityIdentifierScheme;
+
+      private String entityIdentifierStandard;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder isEinvoiceEnabled(Boolean value) {
+        this.isEinvoiceEnabled = value;
+        return this;
+      }
+
+      public CustomerBuilder entityIdentifierScheme(String value) {
+        this.entityIdentifierScheme = value;
+        return this;
+      }
+
+      public CustomerBuilder entityIdentifierStandard(String value) {
+        this.entityIdentifierStandard = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private final ItemType itemType;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOnOption = builder.chargeOnOption;
+
+      this.itemType = builder.itemType;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOnOption chargeOnOption;
+
+      private ItemType itemType;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final OperationType operationType;
+
+    private final String id;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.operationType = builder.operationType;
+
+      this.id = builder.id;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public OperationType getOperationType() {
+      return operationType;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.operationType != null) {
+
+        formData.put("operation_type", this.operationType);
+      }
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private OperationType operationType;
+
+      private String id;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder operationType(OperationType value) {
+        this.operationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OperationType {
+      ADD("add"),
+
+      REMOVE("remove"),
+
+      /** An enum member indicating that OperationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OperationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OperationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OperationType enumValue : OperationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class EntityIdentifiersParams {
+
+    private final String id;
+
+    private final String scheme;
+
+    private final String value;
+
+    private final Operation operation;
+
+    private final String standard;
+
+    private EntityIdentifiersParams(EntityIdentifiersBuilder builder) {
+
+      this.id = builder.id;
+
+      this.scheme = builder.scheme;
+
+      this.value = builder.value;
+
+      this.operation = builder.operation;
+
+      this.standard = builder.standard;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getScheme() {
+      return scheme;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public Operation getOperation() {
+      return operation;
+    }
+
+    public String getStandard() {
+      return standard;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.scheme != null) {
+
+        formData.put("scheme", this.scheme);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      if (this.operation != null) {
+
+        formData.put("operation", this.operation);
+      }
+
+      if (this.standard != null) {
+
+        formData.put("standard", this.standard);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EntityIdentifiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EntityIdentifiersBuilder builder() {
+      return new EntityIdentifiersBuilder();
+    }
+
+    public static final class EntityIdentifiersBuilder {
+
+      private String id;
+
+      private String scheme;
+
+      private String value;
+
+      private Operation operation;
+
+      private String standard;
+
+      private EntityIdentifiersBuilder() {}
+
+      public EntityIdentifiersBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder scheme(String value) {
+        this.scheme = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder operation(Operation value) {
+        this.operation = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder standard(String value) {
+        this.standard = value;
+        return this;
+      }
+
+      public EntityIdentifiersParams build() {
+        return new EntityIdentifiersParams(this);
+      }
+    }
+
+    public enum Operation {
+      CREATE("create"),
+
+      UPDATE("update"),
+
+      DELETE("delete"),
+
+      /** An enum member indicating that Operation was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Operation(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Operation fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Operation enumValue : Operation.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutExistingParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutExistingParams.java
new file mode 100644
index 00000000..d6f31cb7
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutExistingParams.java
@@ -0,0 +1,1749 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class HostedPageCheckoutExistingParams {
+
+  private final Boolean replaceAddonList;
+
+  private final List<String> mandatoryAddonsToRemove;
+
+  private final Timestamp invoiceDate;
+
+  private final Integer billingCycles;
+
+  private final Integer termsToCharge;
+
+  private final Timestamp reactivateFrom;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final Boolean replaceCouponList;
+
+  private final Boolean reactivate;
+
+  private final Boolean forceTermReset;
+
+  private final String redirectUrl;
+
+  private final String cancelUrl;
+
+  private final String passThruContent;
+
+  private final Boolean embed;
+
+  private final Boolean iframeMessaging;
+
+  private final Boolean allowOfflinePaymentMethods;
+
+  private final SubscriptionParams subscription;
+
+  private final CustomerParams customer;
+
+  private final CardParams card;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<AddonsParams> addons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private HostedPageCheckoutExistingParams(HostedPageCheckoutExistingBuilder builder) {
+
+    this.replaceAddonList = builder.replaceAddonList;
+
+    this.mandatoryAddonsToRemove = builder.mandatoryAddonsToRemove;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.reactivateFrom = builder.reactivateFrom;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.replaceCouponList = builder.replaceCouponList;
+
+    this.reactivate = builder.reactivate;
+
+    this.forceTermReset = builder.forceTermReset;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.cancelUrl = builder.cancelUrl;
+
+    this.passThruContent = builder.passThruContent;
+
+    this.embed = builder.embed;
+
+    this.iframeMessaging = builder.iframeMessaging;
+
+    this.allowOfflinePaymentMethods = builder.allowOfflinePaymentMethods;
+
+    this.subscription = builder.subscription;
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.addons = builder.addons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+  }
+
+  public Boolean getReplaceAddonList() {
+    return replaceAddonList;
+  }
+
+  public List<String> getMandatoryAddonsToRemove() {
+    return mandatoryAddonsToRemove;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public Timestamp getReactivateFrom() {
+    return reactivateFrom;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public Boolean getReplaceCouponList() {
+    return replaceCouponList;
+  }
+
+  public Boolean getReactivate() {
+    return reactivate;
+  }
+
+  public Boolean getForceTermReset() {
+    return forceTermReset;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public String getCancelUrl() {
+    return cancelUrl;
+  }
+
+  public String getPassThruContent() {
+    return passThruContent;
+  }
+
+  public Boolean getEmbed() {
+    return embed;
+  }
+
+  public Boolean getIframeMessaging() {
+    return iframeMessaging;
+  }
+
+  public Boolean getAllowOfflinePaymentMethods() {
+    return allowOfflinePaymentMethods;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.replaceAddonList != null) {
+
+      formData.put("replace_addon_list", this.replaceAddonList);
+    }
+
+    if (this.mandatoryAddonsToRemove != null) {
+
+      formData.put("mandatory_addons_to_remove", this.mandatoryAddonsToRemove);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.reactivateFrom != null) {
+
+      formData.put("reactivate_from", this.reactivateFrom);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.replaceCouponList != null) {
+
+      formData.put("replace_coupon_list", this.replaceCouponList);
+    }
+
+    if (this.reactivate != null) {
+
+      formData.put("reactivate", this.reactivate);
+    }
+
+    if (this.forceTermReset != null) {
+
+      formData.put("force_term_reset", this.forceTermReset);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.cancelUrl != null) {
+
+      formData.put("cancel_url", this.cancelUrl);
+    }
+
+    if (this.passThruContent != null) {
+
+      formData.put("pass_thru_content", this.passThruContent);
+    }
+
+    if (this.embed != null) {
+
+      formData.put("embed", this.embed);
+    }
+
+    if (this.iframeMessaging != null) {
+
+      formData.put("iframe_messaging", this.iframeMessaging);
+    }
+
+    if (this.allowOfflinePaymentMethods != null) {
+
+      formData.put("allow_offline_payment_methods", this.allowOfflinePaymentMethods);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageCheckoutExistingParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageCheckoutExistingBuilder builder() {
+    return new HostedPageCheckoutExistingBuilder();
+  }
+
+  public static final class HostedPageCheckoutExistingBuilder {
+
+    private Boolean replaceAddonList;
+
+    private List<String> mandatoryAddonsToRemove;
+
+    private Timestamp invoiceDate;
+
+    private Integer billingCycles;
+
+    private Integer termsToCharge;
+
+    private Timestamp reactivateFrom;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private Boolean replaceCouponList;
+
+    private Boolean reactivate;
+
+    private Boolean forceTermReset;
+
+    private String redirectUrl;
+
+    private String cancelUrl;
+
+    private String passThruContent;
+
+    private Boolean embed;
+
+    private Boolean iframeMessaging;
+
+    private Boolean allowOfflinePaymentMethods;
+
+    private SubscriptionParams subscription;
+
+    private CustomerParams customer;
+
+    private CardParams card;
+
+    private ContractTermParams contractTerm;
+
+    private List<AddonsParams> addons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private HostedPageCheckoutExistingBuilder() {}
+
+    public HostedPageCheckoutExistingBuilder replaceAddonList(Boolean value) {
+      this.replaceAddonList = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder mandatoryAddonsToRemove(List<String> value) {
+      this.mandatoryAddonsToRemove = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder reactivateFrom(Timestamp value) {
+      this.reactivateFrom = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder replaceCouponList(Boolean value) {
+      this.replaceCouponList = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder reactivate(Boolean value) {
+      this.reactivate = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder forceTermReset(Boolean value) {
+      this.forceTermReset = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder cancelUrl(String value) {
+      this.cancelUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder passThruContent(String value) {
+      this.passThruContent = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder embed(Boolean value) {
+      this.embed = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder iframeMessaging(Boolean value) {
+      this.iframeMessaging = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder allowOfflinePaymentMethods(Boolean value) {
+      this.allowOfflinePaymentMethods = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public HostedPageCheckoutExistingParams build() {
+      return new HostedPageCheckoutExistingParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final String planId;
+
+    private final Integer planQuantity;
+
+    private final Long planUnitPrice;
+
+    private final Long setupFee;
+
+    private final String planQuantityInDecimal;
+
+    private final String planUnitPriceInDecimal;
+
+    private final Timestamp startDate;
+
+    private final Timestamp trialEnd;
+
+    private final String coupon;
+
+    private final AutoCollection autoCollection;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final String invoiceNotes;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.planId = builder.planId;
+
+      this.planQuantity = builder.planQuantity;
+
+      this.planUnitPrice = builder.planUnitPrice;
+
+      this.setupFee = builder.setupFee;
+
+      this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+      this.planUnitPriceInDecimal = builder.planUnitPriceInDecimal;
+
+      this.startDate = builder.startDate;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.coupon = builder.coupon;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.invoiceNotes = builder.invoiceNotes;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getPlanId() {
+      return planId;
+    }
+
+    public Integer getPlanQuantity() {
+      return planQuantity;
+    }
+
+    public Long getPlanUnitPrice() {
+      return planUnitPrice;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public String getPlanQuantityInDecimal() {
+      return planQuantityInDecimal;
+    }
+
+    public String getPlanUnitPriceInDecimal() {
+      return planUnitPriceInDecimal;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public String getCoupon() {
+      return coupon;
+    }
+
+    public AutoCollection getAutoCollection() {
+      return autoCollection;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public String getInvoiceNotes() {
+      return invoiceNotes;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.planId != null) {
+
+        formData.put("plan_id", this.planId);
+      }
+
+      if (this.planQuantity != null) {
+
+        formData.put("plan_quantity", this.planQuantity);
+      }
+
+      if (this.planUnitPrice != null) {
+
+        formData.put("plan_unit_price", this.planUnitPrice);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.planQuantityInDecimal != null) {
+
+        formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+      }
+
+      if (this.planUnitPriceInDecimal != null) {
+
+        formData.put("plan_unit_price_in_decimal", this.planUnitPriceInDecimal);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.coupon != null) {
+
+        formData.put("coupon", this.coupon);
+      }
+
+      if (this.autoCollection != null) {
+
+        formData.put("auto_collection", this.autoCollection);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.invoiceNotes != null) {
+
+        formData.put("invoice_notes", this.invoiceNotes);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private String planId;
+
+      private Integer planQuantity;
+
+      private Long planUnitPrice;
+
+      private Long setupFee;
+
+      private String planQuantityInDecimal;
+
+      private String planUnitPriceInDecimal;
+
+      private Timestamp startDate;
+
+      private Timestamp trialEnd;
+
+      private String coupon;
+
+      private AutoCollection autoCollection;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private String invoiceNotes;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planId(String value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantity(Integer value) {
+        this.planQuantity = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPrice(Long value) {
+        this.planUnitPrice = value;
+        return this;
+      }
+
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantityInDecimal(String value) {
+        this.planQuantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
+        this.planUnitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder coupon(String value) {
+        this.coupon = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCollection(AutoCollection value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder invoiceNotes(String value) {
+        this.invoiceNotes = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum AutoCollection {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AutoCollection(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AutoCollection fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AutoCollection enumValue : AutoCollection.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final Integer billingCycles;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private Integer billingCycles;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final Integer servicePeriodInDays;
+
+    private final ChargeOn chargeOn;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+
+      this.chargeOn = builder.chargeOn;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    public ChargeOn getChargeOn() {
+      return chargeOn;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      if (this.chargeOn != null) {
+
+        formData.put("charge_on", this.chargeOn);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private Integer servicePeriodInDays;
+
+      private ChargeOn chargeOn;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
+        this.chargeOn = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum ChargeOn {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOn enumValue : ChargeOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutGiftForItemsParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutGiftForItemsParams.java
new file mode 100644
index 00000000..ceca10ca
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutGiftForItemsParams.java
@@ -0,0 +1,531 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class HostedPageCheckoutGiftForItemsParams {
+
+  private final String businessEntityId;
+
+  private final String redirectUrl;
+
+  private final List<String> couponIds;
+
+  private final GifterParams gifter;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private HostedPageCheckoutGiftForItemsParams(HostedPageCheckoutGiftForItemsBuilder builder) {
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.couponIds = builder.couponIds;
+
+    this.gifter = builder.gifter;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.itemTiers = builder.itemTiers;
+  }
+
+  public String getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public GifterParams getGifter() {
+    return gifter;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.businessEntityId != null) {
+
+      formData.put("business_entity_id", this.businessEntityId);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.gifter != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.gifter.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "gifter[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageCheckoutGiftForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageCheckoutGiftForItemsBuilder builder() {
+    return new HostedPageCheckoutGiftForItemsBuilder();
+  }
+
+  public static final class HostedPageCheckoutGiftForItemsBuilder {
+
+    private String businessEntityId;
+
+    private String redirectUrl;
+
+    private List<String> couponIds;
+
+    private GifterParams gifter;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private HostedPageCheckoutGiftForItemsBuilder() {}
+
+    public HostedPageCheckoutGiftForItemsBuilder businessEntityId(String value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public HostedPageCheckoutGiftForItemsBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutGiftForItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public HostedPageCheckoutGiftForItemsBuilder gifter(GifterParams value) {
+      this.gifter = value;
+      return this;
+    }
+
+    public HostedPageCheckoutGiftForItemsBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public HostedPageCheckoutGiftForItemsBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public HostedPageCheckoutGiftForItemsParams build() {
+      return new HostedPageCheckoutGiftForItemsParams(this);
+    }
+  }
+
+  public static final class GifterParams {
+
+    private final String customerId;
+
+    private GifterParams(GifterBuilder builder) {
+
+      this.customerId = builder.customerId;
+    }
+
+    public String getCustomerId() {
+      return customerId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.customerId != null) {
+
+        formData.put("customer_id", this.customerId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GifterParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GifterBuilder builder() {
+      return new GifterBuilder();
+    }
+
+    public static final class GifterBuilder {
+
+      private String customerId;
+
+      private GifterBuilder() {}
+
+      public GifterBuilder customerId(String value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public GifterParams build() {
+        return new GifterParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutGiftParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutGiftParams.java
new file mode 100644
index 00000000..3554a55a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutGiftParams.java
@@ -0,0 +1,406 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class HostedPageCheckoutGiftParams {
+
+  private final String redirectUrl;
+
+  private final List<String> couponIds;
+
+  private final GifterParams gifter;
+
+  private final SubscriptionParams subscription;
+
+  private final List<AddonsParams> addons;
+
+  private HostedPageCheckoutGiftParams(HostedPageCheckoutGiftBuilder builder) {
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.couponIds = builder.couponIds;
+
+    this.gifter = builder.gifter;
+
+    this.subscription = builder.subscription;
+
+    this.addons = builder.addons;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public GifterParams getGifter() {
+    return gifter;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.gifter != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.gifter.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "gifter[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageCheckoutGiftParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageCheckoutGiftBuilder builder() {
+    return new HostedPageCheckoutGiftBuilder();
+  }
+
+  public static final class HostedPageCheckoutGiftBuilder {
+
+    private String redirectUrl;
+
+    private List<String> couponIds;
+
+    private GifterParams gifter;
+
+    private SubscriptionParams subscription;
+
+    private List<AddonsParams> addons;
+
+    private HostedPageCheckoutGiftBuilder() {}
+
+    public HostedPageCheckoutGiftBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutGiftBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public HostedPageCheckoutGiftBuilder gifter(GifterParams value) {
+      this.gifter = value;
+      return this;
+    }
+
+    public HostedPageCheckoutGiftBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public HostedPageCheckoutGiftBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public HostedPageCheckoutGiftParams build() {
+      return new HostedPageCheckoutGiftParams(this);
+    }
+  }
+
+  public static final class GifterParams {
+
+    private final String customerId;
+
+    private GifterParams(GifterBuilder builder) {
+
+      this.customerId = builder.customerId;
+    }
+
+    public String getCustomerId() {
+      return customerId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.customerId != null) {
+
+        formData.put("customer_id", this.customerId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GifterParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GifterBuilder builder() {
+      return new GifterBuilder();
+    }
+
+    public static final class GifterBuilder {
+
+      private String customerId;
+
+      private GifterBuilder() {}
+
+      public GifterBuilder customerId(String value) {
+        this.customerId = value;
+        return this;
+      }
+
+      public GifterParams build() {
+        return new GifterParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String planId;
+
+    private final Integer planQuantity;
+
+    private final String planQuantityInDecimal;
+
+    private final String coupon;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.planId = builder.planId;
+
+      this.planQuantity = builder.planQuantity;
+
+      this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+      this.coupon = builder.coupon;
+    }
+
+    public String getPlanId() {
+      return planId;
+    }
+
+    public Integer getPlanQuantity() {
+      return planQuantity;
+    }
+
+    public String getPlanQuantityInDecimal() {
+      return planQuantityInDecimal;
+    }
+
+    public String getCoupon() {
+      return coupon;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.planId != null) {
+
+        formData.put("plan_id", this.planId);
+      }
+
+      if (this.planQuantity != null) {
+
+        formData.put("plan_quantity", this.planQuantity);
+      }
+
+      if (this.planQuantityInDecimal != null) {
+
+        formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+      }
+
+      if (this.coupon != null) {
+
+        formData.put("coupon", this.coupon);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String planId;
+
+      private Integer planQuantity;
+
+      private String planQuantityInDecimal;
+
+      private String coupon;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder planId(String value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantity(Integer value) {
+        this.planQuantity = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantityInDecimal(String value) {
+        this.planQuantityInDecimal = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder coupon(String value) {
+        this.coupon = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutNewForItemsParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutNewForItemsParams.java
new file mode 100644
index 00000000..3ff6f71c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutNewForItemsParams.java
@@ -0,0 +1,3303 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class HostedPageCheckoutNewForItemsParams {
+
+  private final Layout layout;
+
+  private final String businessEntityId;
+
+  private final Integer billingCycles;
+
+  private final List<String> mandatoryItemsToRemove;
+
+  private final Integer termsToCharge;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final String redirectUrl;
+
+  private final String cancelUrl;
+
+  private final String passThruContent;
+
+  private final Boolean allowOfflinePaymentMethods;
+
+  private final SubscriptionParams subscription;
+
+  private final CustomerParams customer;
+
+  private final CardParams card;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<EntityIdentifiersParams> entityIdentifiers;
+
+  private HostedPageCheckoutNewForItemsParams(HostedPageCheckoutNewForItemsBuilder builder) {
+
+    this.layout = builder.layout;
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.mandatoryItemsToRemove = builder.mandatoryItemsToRemove;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.cancelUrl = builder.cancelUrl;
+
+    this.passThruContent = builder.passThruContent;
+
+    this.allowOfflinePaymentMethods = builder.allowOfflinePaymentMethods;
+
+    this.subscription = builder.subscription;
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.discounts = builder.discounts;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.entityIdentifiers = builder.entityIdentifiers;
+  }
+
+  public Layout getLayout() {
+    return layout;
+  }
+
+  public String getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public List<String> getMandatoryItemsToRemove() {
+    return mandatoryItemsToRemove;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public String getCancelUrl() {
+    return cancelUrl;
+  }
+
+  public String getPassThruContent() {
+    return passThruContent;
+  }
+
+  public Boolean getAllowOfflinePaymentMethods() {
+    return allowOfflinePaymentMethods;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<EntityIdentifiersParams> getEntityIdentifiers() {
+    return entityIdentifiers;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.layout != null) {
+
+      formData.put("layout", this.layout);
+    }
+
+    if (this.businessEntityId != null) {
+
+      formData.put("business_entity_id", this.businessEntityId);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.mandatoryItemsToRemove != null) {
+
+      formData.put("mandatory_items_to_remove", this.mandatoryItemsToRemove);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.cancelUrl != null) {
+
+      formData.put("cancel_url", this.cancelUrl);
+    }
+
+    if (this.passThruContent != null) {
+
+      formData.put("pass_thru_content", this.passThruContent);
+    }
+
+    if (this.allowOfflinePaymentMethods != null) {
+
+      formData.put("allow_offline_payment_methods", this.allowOfflinePaymentMethods);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.entityIdentifiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.entityIdentifiers.size(); i++) {
+        EntityIdentifiersParams item = this.entityIdentifiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "entity_identifiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageCheckoutNewForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageCheckoutNewForItemsBuilder builder() {
+    return new HostedPageCheckoutNewForItemsBuilder();
+  }
+
+  public static final class HostedPageCheckoutNewForItemsBuilder {
+
+    private Layout layout;
+
+    private String businessEntityId;
+
+    private Integer billingCycles;
+
+    private List<String> mandatoryItemsToRemove;
+
+    private Integer termsToCharge;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private String redirectUrl;
+
+    private String cancelUrl;
+
+    private String passThruContent;
+
+    private Boolean allowOfflinePaymentMethods;
+
+    private SubscriptionParams subscription;
+
+    private CustomerParams customer;
+
+    private CardParams card;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private ContractTermParams contractTerm;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<DiscountsParams> discounts;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<EntityIdentifiersParams> entityIdentifiers;
+
+    private HostedPageCheckoutNewForItemsBuilder() {}
+
+    public HostedPageCheckoutNewForItemsBuilder layout(Layout value) {
+      this.layout = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder businessEntityId(String value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder mandatoryItemsToRemove(List<String> value) {
+      this.mandatoryItemsToRemove = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder cancelUrl(String value) {
+      this.cancelUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder passThruContent(String value) {
+      this.passThruContent = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder allowOfflinePaymentMethods(Boolean value) {
+      this.allowOfflinePaymentMethods = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsBuilder entityIdentifiers(
+        List<EntityIdentifiersParams> value) {
+      this.entityIdentifiers = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewForItemsParams build() {
+      return new HostedPageCheckoutNewForItemsParams(this);
+    }
+  }
+
+  public enum Layout {
+    IN_APP("in_app"),
+
+    FULL_PAGE("full_page"),
+
+    /** An enum member indicating that Layout was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Layout(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Layout fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Layout enumValue : Layout.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final Timestamp trialEnd;
+
+    private final Long setupFee;
+
+    private final Timestamp startDate;
+
+    private final String coupon;
+
+    private final AutoCollection autoCollection;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final String invoiceNotes;
+
+    private final String poNumber;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.setupFee = builder.setupFee;
+
+      this.startDate = builder.startDate;
+
+      this.coupon = builder.coupon;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.invoiceNotes = builder.invoiceNotes;
+
+      this.poNumber = builder.poNumber;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public String getCoupon() {
+      return coupon;
+    }
+
+    public AutoCollection getAutoCollection() {
+      return autoCollection;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public String getInvoiceNotes() {
+      return invoiceNotes;
+    }
+
+    public String getPoNumber() {
+      return poNumber;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.coupon != null) {
+
+        formData.put("coupon", this.coupon);
+      }
+
+      if (this.autoCollection != null) {
+
+        formData.put("auto_collection", this.autoCollection);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.invoiceNotes != null) {
+
+        formData.put("invoice_notes", this.invoiceNotes);
+      }
+
+      if (this.poNumber != null) {
+
+        formData.put("po_number", this.poNumber);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private Timestamp trialEnd;
+
+      private Long setupFee;
+
+      private Timestamp startDate;
+
+      private String coupon;
+
+      private AutoCollection autoCollection;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private String invoiceNotes;
+
+      private String poNumber;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder coupon(String value) {
+        this.coupon = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCollection(AutoCollection value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder invoiceNotes(String value) {
+        this.invoiceNotes = value;
+        return this;
+      }
+
+      public SubscriptionBuilder poNumber(String value) {
+        this.poNumber = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum AutoCollection {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AutoCollection(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AutoCollection fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AutoCollection enumValue : AutoCollection.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private final String email;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String locale;
+
+    private final Taxability taxability;
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final Boolean isEinvoiceEnabled;
+
+    private final String entityIdentifierScheme;
+
+    private final String entityIdentifierStandard;
+
+    private final EinvoicingMethod einvoicingMethod;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.email = builder.email;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.locale = builder.locale;
+
+      this.taxability = builder.taxability;
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.isEinvoiceEnabled = builder.isEinvoiceEnabled;
+
+      this.entityIdentifierScheme = builder.entityIdentifierScheme;
+
+      this.entityIdentifierStandard = builder.entityIdentifierStandard;
+
+      this.einvoicingMethod = builder.einvoicingMethod;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLocale() {
+      return locale;
+    }
+
+    public Taxability getTaxability() {
+      return taxability;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public Boolean getIsEinvoiceEnabled() {
+      return isEinvoiceEnabled;
+    }
+
+    public String getEntityIdentifierScheme() {
+      return entityIdentifierScheme;
+    }
+
+    public String getEntityIdentifierStandard() {
+      return entityIdentifierStandard;
+    }
+
+    public EinvoicingMethod getEinvoicingMethod() {
+      return einvoicingMethod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.locale != null) {
+
+        formData.put("locale", this.locale);
+      }
+
+      if (this.taxability != null) {
+
+        formData.put("taxability", this.taxability);
+      }
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.isEinvoiceEnabled != null) {
+
+        formData.put("is_einvoice_enabled", this.isEinvoiceEnabled);
+      }
+
+      if (this.entityIdentifierScheme != null) {
+
+        formData.put("entity_identifier_scheme", this.entityIdentifierScheme);
+      }
+
+      if (this.entityIdentifierStandard != null) {
+
+        formData.put("entity_identifier_standard", this.entityIdentifierStandard);
+      }
+
+      if (this.einvoicingMethod != null) {
+
+        formData.put("einvoicing_method", this.einvoicingMethod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private String email;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String company;
+
+      private String phone;
+
+      private String locale;
+
+      private Taxability taxability;
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private Boolean isEinvoiceEnabled;
+
+      private String entityIdentifierScheme;
+
+      private String entityIdentifierStandard;
+
+      private EinvoicingMethod einvoicingMethod;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CustomerBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CustomerBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public CustomerBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public CustomerBuilder locale(String value) {
+        this.locale = value;
+        return this;
+      }
+
+      public CustomerBuilder taxability(Taxability value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder isEinvoiceEnabled(Boolean value) {
+        this.isEinvoiceEnabled = value;
+        return this;
+      }
+
+      public CustomerBuilder entityIdentifierScheme(String value) {
+        this.entityIdentifierScheme = value;
+        return this;
+      }
+
+      public CustomerBuilder entityIdentifierStandard(String value) {
+        this.entityIdentifierStandard = value;
+        return this;
+      }
+
+      public CustomerBuilder einvoicingMethod(EinvoicingMethod value) {
+        this.einvoicingMethod = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+
+    public enum Taxability {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Taxability was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Taxability(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Taxability fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Taxability enumValue : Taxability.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum EinvoicingMethod {
+      AUTOMATIC("automatic"),
+
+      MANUAL("manual"),
+
+      SITE_DEFAULT("site_default"),
+
+      /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EinvoicingMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EinvoicingMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ItemType itemType;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.itemType = builder.itemType;
+
+      this.chargeOnOption = builder.chargeOnOption;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ItemType itemType;
+
+      private ChargeOnOption chargeOnOption;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class EntityIdentifiersParams {
+
+    private final String id;
+
+    private final String scheme;
+
+    private final String value;
+
+    private final Operation operation;
+
+    private final String standard;
+
+    private EntityIdentifiersParams(EntityIdentifiersBuilder builder) {
+
+      this.id = builder.id;
+
+      this.scheme = builder.scheme;
+
+      this.value = builder.value;
+
+      this.operation = builder.operation;
+
+      this.standard = builder.standard;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getScheme() {
+      return scheme;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public Operation getOperation() {
+      return operation;
+    }
+
+    public String getStandard() {
+      return standard;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.scheme != null) {
+
+        formData.put("scheme", this.scheme);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      if (this.operation != null) {
+
+        formData.put("operation", this.operation);
+      }
+
+      if (this.standard != null) {
+
+        formData.put("standard", this.standard);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EntityIdentifiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EntityIdentifiersBuilder builder() {
+      return new EntityIdentifiersBuilder();
+    }
+
+    public static final class EntityIdentifiersBuilder {
+
+      private String id;
+
+      private String scheme;
+
+      private String value;
+
+      private Operation operation;
+
+      private String standard;
+
+      private EntityIdentifiersBuilder() {}
+
+      public EntityIdentifiersBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder scheme(String value) {
+        this.scheme = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder operation(Operation value) {
+        this.operation = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder standard(String value) {
+        this.standard = value;
+        return this;
+      }
+
+      public EntityIdentifiersParams build() {
+        return new EntityIdentifiersParams(this);
+      }
+    }
+
+    public enum Operation {
+      CREATE("create"),
+
+      UPDATE("update"),
+
+      DELETE("delete"),
+
+      /** An enum member indicating that Operation was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Operation(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Operation fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Operation enumValue : Operation.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutNewParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutNewParams.java
new file mode 100644
index 00000000..2f7ddff3
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutNewParams.java
@@ -0,0 +1,2587 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class HostedPageCheckoutNewParams {
+
+  private final Integer billingCycles;
+
+  private final List<String> mandatoryAddonsToRemove;
+
+  private final Integer termsToCharge;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final String redirectUrl;
+
+  private final String cancelUrl;
+
+  private final String passThruContent;
+
+  private final Boolean embed;
+
+  private final Boolean iframeMessaging;
+
+  private final Boolean allowOfflinePaymentMethods;
+
+  private final SubscriptionParams subscription;
+
+  private final CustomerParams customer;
+
+  private final CardParams card;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<AddonsParams> addons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private HostedPageCheckoutNewParams(HostedPageCheckoutNewBuilder builder) {
+
+    this.billingCycles = builder.billingCycles;
+
+    this.mandatoryAddonsToRemove = builder.mandatoryAddonsToRemove;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.cancelUrl = builder.cancelUrl;
+
+    this.passThruContent = builder.passThruContent;
+
+    this.embed = builder.embed;
+
+    this.iframeMessaging = builder.iframeMessaging;
+
+    this.allowOfflinePaymentMethods = builder.allowOfflinePaymentMethods;
+
+    this.subscription = builder.subscription;
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.addons = builder.addons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public List<String> getMandatoryAddonsToRemove() {
+    return mandatoryAddonsToRemove;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public String getCancelUrl() {
+    return cancelUrl;
+  }
+
+  public String getPassThruContent() {
+    return passThruContent;
+  }
+
+  public Boolean getEmbed() {
+    return embed;
+  }
+
+  public Boolean getIframeMessaging() {
+    return iframeMessaging;
+  }
+
+  public Boolean getAllowOfflinePaymentMethods() {
+    return allowOfflinePaymentMethods;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.mandatoryAddonsToRemove != null) {
+
+      formData.put("mandatory_addons_to_remove", this.mandatoryAddonsToRemove);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.cancelUrl != null) {
+
+      formData.put("cancel_url", this.cancelUrl);
+    }
+
+    if (this.passThruContent != null) {
+
+      formData.put("pass_thru_content", this.passThruContent);
+    }
+
+    if (this.embed != null) {
+
+      formData.put("embed", this.embed);
+    }
+
+    if (this.iframeMessaging != null) {
+
+      formData.put("iframe_messaging", this.iframeMessaging);
+    }
+
+    if (this.allowOfflinePaymentMethods != null) {
+
+      formData.put("allow_offline_payment_methods", this.allowOfflinePaymentMethods);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageCheckoutNewParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageCheckoutNewBuilder builder() {
+    return new HostedPageCheckoutNewBuilder();
+  }
+
+  public static final class HostedPageCheckoutNewBuilder {
+
+    private Integer billingCycles;
+
+    private List<String> mandatoryAddonsToRemove;
+
+    private Integer termsToCharge;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private String redirectUrl;
+
+    private String cancelUrl;
+
+    private String passThruContent;
+
+    private Boolean embed;
+
+    private Boolean iframeMessaging;
+
+    private Boolean allowOfflinePaymentMethods;
+
+    private SubscriptionParams subscription;
+
+    private CustomerParams customer;
+
+    private CardParams card;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private ContractTermParams contractTerm;
+
+    private List<AddonsParams> addons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private HostedPageCheckoutNewBuilder() {}
+
+    public HostedPageCheckoutNewBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder mandatoryAddonsToRemove(List<String> value) {
+      this.mandatoryAddonsToRemove = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder cancelUrl(String value) {
+      this.cancelUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder passThruContent(String value) {
+      this.passThruContent = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder embed(Boolean value) {
+      this.embed = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder iframeMessaging(Boolean value) {
+      this.iframeMessaging = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder allowOfflinePaymentMethods(Boolean value) {
+      this.allowOfflinePaymentMethods = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public HostedPageCheckoutNewParams build() {
+      return new HostedPageCheckoutNewParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final String planId;
+
+    private final Integer planQuantity;
+
+    private final String planQuantityInDecimal;
+
+    private final Long planUnitPrice;
+
+    private final String planUnitPriceInDecimal;
+
+    private final Long setupFee;
+
+    private final Timestamp trialEnd;
+
+    private final Timestamp startDate;
+
+    private final String coupon;
+
+    private final AutoCollection autoCollection;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final String invoiceNotes;
+
+    private final String affiliateToken;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.planId = builder.planId;
+
+      this.planQuantity = builder.planQuantity;
+
+      this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+      this.planUnitPrice = builder.planUnitPrice;
+
+      this.planUnitPriceInDecimal = builder.planUnitPriceInDecimal;
+
+      this.setupFee = builder.setupFee;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.startDate = builder.startDate;
+
+      this.coupon = builder.coupon;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.invoiceNotes = builder.invoiceNotes;
+
+      this.affiliateToken = builder.affiliateToken;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getPlanId() {
+      return planId;
+    }
+
+    public Integer getPlanQuantity() {
+      return planQuantity;
+    }
+
+    public String getPlanQuantityInDecimal() {
+      return planQuantityInDecimal;
+    }
+
+    public Long getPlanUnitPrice() {
+      return planUnitPrice;
+    }
+
+    public String getPlanUnitPriceInDecimal() {
+      return planUnitPriceInDecimal;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public String getCoupon() {
+      return coupon;
+    }
+
+    public AutoCollection getAutoCollection() {
+      return autoCollection;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public String getInvoiceNotes() {
+      return invoiceNotes;
+    }
+
+    public String getAffiliateToken() {
+      return affiliateToken;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.planId != null) {
+
+        formData.put("plan_id", this.planId);
+      }
+
+      if (this.planQuantity != null) {
+
+        formData.put("plan_quantity", this.planQuantity);
+      }
+
+      if (this.planQuantityInDecimal != null) {
+
+        formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+      }
+
+      if (this.planUnitPrice != null) {
+
+        formData.put("plan_unit_price", this.planUnitPrice);
+      }
+
+      if (this.planUnitPriceInDecimal != null) {
+
+        formData.put("plan_unit_price_in_decimal", this.planUnitPriceInDecimal);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.coupon != null) {
+
+        formData.put("coupon", this.coupon);
+      }
+
+      if (this.autoCollection != null) {
+
+        formData.put("auto_collection", this.autoCollection);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.invoiceNotes != null) {
+
+        formData.put("invoice_notes", this.invoiceNotes);
+      }
+
+      if (this.affiliateToken != null) {
+
+        formData.put("affiliate_token", this.affiliateToken);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private String planId;
+
+      private Integer planQuantity;
+
+      private String planQuantityInDecimal;
+
+      private Long planUnitPrice;
+
+      private String planUnitPriceInDecimal;
+
+      private Long setupFee;
+
+      private Timestamp trialEnd;
+
+      private Timestamp startDate;
+
+      private String coupon;
+
+      private AutoCollection autoCollection;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private String invoiceNotes;
+
+      private String affiliateToken;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planId(String value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantity(Integer value) {
+        this.planQuantity = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantityInDecimal(String value) {
+        this.planQuantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPrice(Long value) {
+        this.planUnitPrice = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
+        this.planUnitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder coupon(String value) {
+        this.coupon = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCollection(AutoCollection value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder invoiceNotes(String value) {
+        this.invoiceNotes = value;
+        return this;
+      }
+
+      public SubscriptionBuilder affiliateToken(String value) {
+        this.affiliateToken = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum AutoCollection {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AutoCollection(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AutoCollection fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AutoCollection enumValue : AutoCollection.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private final String email;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String locale;
+
+    private final Taxability taxability;
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final Boolean consolidatedInvoicing;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.email = builder.email;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.locale = builder.locale;
+
+      this.taxability = builder.taxability;
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.consolidatedInvoicing = builder.consolidatedInvoicing;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLocale() {
+      return locale;
+    }
+
+    public Taxability getTaxability() {
+      return taxability;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public Boolean getConsolidatedInvoicing() {
+      return consolidatedInvoicing;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.locale != null) {
+
+        formData.put("locale", this.locale);
+      }
+
+      if (this.taxability != null) {
+
+        formData.put("taxability", this.taxability);
+      }
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.consolidatedInvoicing != null) {
+
+        formData.put("consolidated_invoicing", this.consolidatedInvoicing);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private String email;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String company;
+
+      private String phone;
+
+      private String locale;
+
+      private Taxability taxability;
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private Boolean consolidatedInvoicing;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CustomerBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CustomerBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public CustomerBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public CustomerBuilder locale(String value) {
+        this.locale = value;
+        return this;
+      }
+
+      public CustomerBuilder taxability(Taxability value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder consolidatedInvoicing(Boolean value) {
+        this.consolidatedInvoicing = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+
+    public enum Taxability {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Taxability was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Taxability(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Taxability fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Taxability enumValue : Taxability.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriodInDays;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOn chargeOn;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOn = builder.chargeOn;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOn getChargeOn() {
+      return chargeOn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOn != null) {
+
+        formData.put("charge_on", this.chargeOn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriodInDays;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOn chargeOn;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
+        this.chargeOn = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOn {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOn enumValue : ChargeOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutOneTimeForItemsParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutOneTimeForItemsParams.java
new file mode 100644
index 00000000..517e4295
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutOneTimeForItemsParams.java
@@ -0,0 +1,2885 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class HostedPageCheckoutOneTimeForItemsParams {
+
+  private final String businessEntityId;
+
+  private final Layout layout;
+
+  private final String invoiceNote;
+
+  private final String coupon;
+
+  private final List<String> couponIds;
+
+  private final String currencyCode;
+
+  private final String redirectUrl;
+
+  private final String cancelUrl;
+
+  private final String passThruContent;
+
+  private final CustomerParams customer;
+
+  private final InvoiceParams invoice;
+
+  private final CardParams card;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<ItemPricesParams> itemPrices;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<ChargesParams> charges;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<EntityIdentifiersParams> entityIdentifiers;
+
+  private HostedPageCheckoutOneTimeForItemsParams(
+      HostedPageCheckoutOneTimeForItemsBuilder builder) {
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.layout = builder.layout;
+
+    this.invoiceNote = builder.invoiceNote;
+
+    this.coupon = builder.coupon;
+
+    this.couponIds = builder.couponIds;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.cancelUrl = builder.cancelUrl;
+
+    this.passThruContent = builder.passThruContent;
+
+    this.customer = builder.customer;
+
+    this.invoice = builder.invoice;
+
+    this.card = builder.card;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.itemPrices = builder.itemPrices;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.charges = builder.charges;
+
+    this.discounts = builder.discounts;
+
+    this.entityIdentifiers = builder.entityIdentifiers;
+  }
+
+  public String getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public Layout getLayout() {
+    return layout;
+  }
+
+  public String getInvoiceNote() {
+    return invoiceNote;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public String getCancelUrl() {
+    return cancelUrl;
+  }
+
+  public String getPassThruContent() {
+    return passThruContent;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public InvoiceParams getInvoice() {
+    return invoice;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<ItemPricesParams> getItemPrices() {
+    return itemPrices;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<ChargesParams> getCharges() {
+    return charges;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<EntityIdentifiersParams> getEntityIdentifiers() {
+    return entityIdentifiers;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.businessEntityId != null) {
+
+      formData.put("business_entity_id", this.businessEntityId);
+    }
+
+    if (this.layout != null) {
+
+      formData.put("layout", this.layout);
+    }
+
+    if (this.invoiceNote != null) {
+
+      formData.put("invoice_note", this.invoiceNote);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.cancelUrl != null) {
+
+      formData.put("cancel_url", this.cancelUrl);
+    }
+
+    if (this.passThruContent != null) {
+
+      formData.put("pass_thru_content", this.passThruContent);
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.invoice != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.invoice.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "invoice[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemPrices != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemPrices.size(); i++) {
+        ItemPricesParams item = this.itemPrices.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_prices[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.charges != null) {
+
+      // List of objects
+      for (int i = 0; i < this.charges.size(); i++) {
+        ChargesParams item = this.charges.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.entityIdentifiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.entityIdentifiers.size(); i++) {
+        EntityIdentifiersParams item = this.entityIdentifiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "entity_identifiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageCheckoutOneTimeForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageCheckoutOneTimeForItemsBuilder builder() {
+    return new HostedPageCheckoutOneTimeForItemsBuilder();
+  }
+
+  public static final class HostedPageCheckoutOneTimeForItemsBuilder {
+
+    private String businessEntityId;
+
+    private Layout layout;
+
+    private String invoiceNote;
+
+    private String coupon;
+
+    private List<String> couponIds;
+
+    private String currencyCode;
+
+    private String redirectUrl;
+
+    private String cancelUrl;
+
+    private String passThruContent;
+
+    private CustomerParams customer;
+
+    private InvoiceParams invoice;
+
+    private CardParams card;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<ItemPricesParams> itemPrices;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<ChargesParams> charges;
+
+    private List<DiscountsParams> discounts;
+
+    private List<EntityIdentifiersParams> entityIdentifiers;
+
+    private HostedPageCheckoutOneTimeForItemsBuilder() {}
+
+    public HostedPageCheckoutOneTimeForItemsBuilder businessEntityId(String value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder layout(Layout value) {
+      this.layout = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder invoiceNote(String value) {
+      this.invoiceNote = value;
+      return this;
+    }
+
+    @Deprecated
+    public HostedPageCheckoutOneTimeForItemsBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder cancelUrl(String value) {
+      this.cancelUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder passThruContent(String value) {
+      this.passThruContent = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder invoice(InvoiceParams value) {
+      this.invoice = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder itemPrices(List<ItemPricesParams> value) {
+      this.itemPrices = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder charges(List<ChargesParams> value) {
+      this.charges = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsBuilder entityIdentifiers(
+        List<EntityIdentifiersParams> value) {
+      this.entityIdentifiers = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeForItemsParams build() {
+      return new HostedPageCheckoutOneTimeForItemsParams(this);
+    }
+  }
+
+  public enum Layout {
+    IN_APP("in_app"),
+
+    FULL_PAGE("full_page"),
+
+    /** An enum member indicating that Layout was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Layout(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Layout fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Layout enumValue : Layout.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private final String email;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String locale;
+
+    private final Taxability taxability;
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final EinvoicingMethod einvoicingMethod;
+
+    private final Boolean isEinvoiceEnabled;
+
+    private final String entityIdentifierScheme;
+
+    private final String entityIdentifierStandard;
+
+    private final Boolean consolidatedInvoicing;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.email = builder.email;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.locale = builder.locale;
+
+      this.taxability = builder.taxability;
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.einvoicingMethod = builder.einvoicingMethod;
+
+      this.isEinvoiceEnabled = builder.isEinvoiceEnabled;
+
+      this.entityIdentifierScheme = builder.entityIdentifierScheme;
+
+      this.entityIdentifierStandard = builder.entityIdentifierStandard;
+
+      this.consolidatedInvoicing = builder.consolidatedInvoicing;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLocale() {
+      return locale;
+    }
+
+    public Taxability getTaxability() {
+      return taxability;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public EinvoicingMethod getEinvoicingMethod() {
+      return einvoicingMethod;
+    }
+
+    public Boolean getIsEinvoiceEnabled() {
+      return isEinvoiceEnabled;
+    }
+
+    public String getEntityIdentifierScheme() {
+      return entityIdentifierScheme;
+    }
+
+    public String getEntityIdentifierStandard() {
+      return entityIdentifierStandard;
+    }
+
+    public Boolean getConsolidatedInvoicing() {
+      return consolidatedInvoicing;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.locale != null) {
+
+        formData.put("locale", this.locale);
+      }
+
+      if (this.taxability != null) {
+
+        formData.put("taxability", this.taxability);
+      }
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.einvoicingMethod != null) {
+
+        formData.put("einvoicing_method", this.einvoicingMethod);
+      }
+
+      if (this.isEinvoiceEnabled != null) {
+
+        formData.put("is_einvoice_enabled", this.isEinvoiceEnabled);
+      }
+
+      if (this.entityIdentifierScheme != null) {
+
+        formData.put("entity_identifier_scheme", this.entityIdentifierScheme);
+      }
+
+      if (this.entityIdentifierStandard != null) {
+
+        formData.put("entity_identifier_standard", this.entityIdentifierStandard);
+      }
+
+      if (this.consolidatedInvoicing != null) {
+
+        formData.put("consolidated_invoicing", this.consolidatedInvoicing);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private String email;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String company;
+
+      private String phone;
+
+      private String locale;
+
+      private Taxability taxability;
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private EinvoicingMethod einvoicingMethod;
+
+      private Boolean isEinvoiceEnabled;
+
+      private String entityIdentifierScheme;
+
+      private String entityIdentifierStandard;
+
+      private Boolean consolidatedInvoicing;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CustomerBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CustomerBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public CustomerBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public CustomerBuilder locale(String value) {
+        this.locale = value;
+        return this;
+      }
+
+      public CustomerBuilder taxability(Taxability value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder einvoicingMethod(EinvoicingMethod value) {
+        this.einvoicingMethod = value;
+        return this;
+      }
+
+      public CustomerBuilder isEinvoiceEnabled(Boolean value) {
+        this.isEinvoiceEnabled = value;
+        return this;
+      }
+
+      public CustomerBuilder entityIdentifierScheme(String value) {
+        this.entityIdentifierScheme = value;
+        return this;
+      }
+
+      public CustomerBuilder entityIdentifierStandard(String value) {
+        this.entityIdentifierStandard = value;
+        return this;
+      }
+
+      public CustomerBuilder consolidatedInvoicing(Boolean value) {
+        this.consolidatedInvoicing = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+
+    public enum Taxability {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Taxability was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Taxability(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Taxability fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Taxability enumValue : Taxability.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum EinvoicingMethod {
+      AUTOMATIC("automatic"),
+
+      MANUAL("manual"),
+
+      SITE_DEFAULT("site_default"),
+
+      /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EinvoicingMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EinvoicingMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class InvoiceParams {
+
+    private final String poNumber;
+
+    private InvoiceParams(InvoiceBuilder builder) {
+
+      this.poNumber = builder.poNumber;
+    }
+
+    public String getPoNumber() {
+      return poNumber;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.poNumber != null) {
+
+        formData.put("po_number", this.poNumber);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceBuilder builder() {
+      return new InvoiceBuilder();
+    }
+
+    public static final class InvoiceBuilder {
+
+      private String poNumber;
+
+      private InvoiceBuilder() {}
+
+      public InvoiceBuilder poNumber(String value) {
+        this.poNumber = value;
+        return this;
+      }
+
+      public InvoiceParams build() {
+        return new InvoiceParams(this);
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemPricesParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ItemPricesParams(ItemPricesBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemPricesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemPricesBuilder builder() {
+      return new ItemPricesBuilder();
+    }
+
+    public static final class ItemPricesBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ItemPricesBuilder() {}
+
+      public ItemPricesBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemPricesBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public ItemPricesBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public ItemPricesBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public ItemPricesBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public ItemPricesBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ItemPricesBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ItemPricesParams build() {
+        return new ItemPricesParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChargesParams {
+
+    private final Long amount;
+
+    private final String amountInDecimal;
+
+    private final String description;
+
+    private final Boolean taxable;
+
+    private final String taxProfileId;
+
+    private final String avalaraTaxCode;
+
+    private final String hsnCode;
+
+    private final String taxjarProductCode;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ChargesParams(ChargesBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.description = builder.description;
+
+      this.taxable = builder.taxable;
+
+      this.taxProfileId = builder.taxProfileId;
+
+      this.avalaraTaxCode = builder.avalaraTaxCode;
+
+      this.hsnCode = builder.hsnCode;
+
+      this.taxjarProductCode = builder.taxjarProductCode;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Boolean getTaxable() {
+      return taxable;
+    }
+
+    public String getTaxProfileId() {
+      return taxProfileId;
+    }
+
+    public String getAvalaraTaxCode() {
+      return avalaraTaxCode;
+    }
+
+    public String getHsnCode() {
+      return hsnCode;
+    }
+
+    public String getTaxjarProductCode() {
+      return taxjarProductCode;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.taxable != null) {
+
+        formData.put("taxable", this.taxable);
+      }
+
+      if (this.taxProfileId != null) {
+
+        formData.put("tax_profile_id", this.taxProfileId);
+      }
+
+      if (this.avalaraTaxCode != null) {
+
+        formData.put("avalara_tax_code", this.avalaraTaxCode);
+      }
+
+      if (this.hsnCode != null) {
+
+        formData.put("hsn_code", this.hsnCode);
+      }
+
+      if (this.taxjarProductCode != null) {
+
+        formData.put("taxjar_product_code", this.taxjarProductCode);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargesBuilder builder() {
+      return new ChargesBuilder();
+    }
+
+    public static final class ChargesBuilder {
+
+      private Long amount;
+
+      private String amountInDecimal;
+
+      private String description;
+
+      private Boolean taxable;
+
+      private String taxProfileId;
+
+      private String avalaraTaxCode;
+
+      private String hsnCode;
+
+      private String taxjarProductCode;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ChargesBuilder() {}
+
+      public ChargesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public ChargesBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public ChargesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public ChargesBuilder taxable(Boolean value) {
+        this.taxable = value;
+        return this;
+      }
+
+      public ChargesBuilder taxProfileId(String value) {
+        this.taxProfileId = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTaxCode(String value) {
+        this.avalaraTaxCode = value;
+        return this;
+      }
+
+      public ChargesBuilder hsnCode(String value) {
+        this.hsnCode = value;
+        return this;
+      }
+
+      public ChargesBuilder taxjarProductCode(String value) {
+        this.taxjarProductCode = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public ChargesBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ChargesBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ChargesParams build() {
+        return new ChargesParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer quantity;
+
+    private final ApplyOn applyOn;
+
+    private final String itemPriceId;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.quantity = builder.quantity;
+
+      this.applyOn = builder.applyOn;
+
+      this.itemPriceId = builder.itemPriceId;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer quantity;
+
+      private ApplyOn applyOn;
+
+      private String itemPriceId;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class EntityIdentifiersParams {
+
+    private final String id;
+
+    private final String scheme;
+
+    private final String value;
+
+    private final Operation operation;
+
+    private final String standard;
+
+    private EntityIdentifiersParams(EntityIdentifiersBuilder builder) {
+
+      this.id = builder.id;
+
+      this.scheme = builder.scheme;
+
+      this.value = builder.value;
+
+      this.operation = builder.operation;
+
+      this.standard = builder.standard;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getScheme() {
+      return scheme;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public Operation getOperation() {
+      return operation;
+    }
+
+    public String getStandard() {
+      return standard;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.scheme != null) {
+
+        formData.put("scheme", this.scheme);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      if (this.operation != null) {
+
+        formData.put("operation", this.operation);
+      }
+
+      if (this.standard != null) {
+
+        formData.put("standard", this.standard);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EntityIdentifiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EntityIdentifiersBuilder builder() {
+      return new EntityIdentifiersBuilder();
+    }
+
+    public static final class EntityIdentifiersBuilder {
+
+      private String id;
+
+      private String scheme;
+
+      private String value;
+
+      private Operation operation;
+
+      private String standard;
+
+      private EntityIdentifiersBuilder() {}
+
+      public EntityIdentifiersBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder scheme(String value) {
+        this.scheme = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder operation(Operation value) {
+        this.operation = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder standard(String value) {
+        this.standard = value;
+        return this;
+      }
+
+      public EntityIdentifiersParams build() {
+        return new EntityIdentifiersParams(this);
+      }
+    }
+
+    public enum Operation {
+      CREATE("create"),
+
+      UPDATE("update"),
+
+      DELETE("delete"),
+
+      /** An enum member indicating that Operation was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Operation(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Operation fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Operation enumValue : Operation.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutOneTimeParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutOneTimeParams.java
new file mode 100644
index 00000000..005b5782
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCheckoutOneTimeParams.java
@@ -0,0 +1,2103 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class HostedPageCheckoutOneTimeParams {
+
+  private final String currencyCode;
+
+  private final String invoiceNote;
+
+  private final String coupon;
+
+  private final List<String> couponIds;
+
+  private final String redirectUrl;
+
+  private final String cancelUrl;
+
+  private final String passThruContent;
+
+  private final Boolean embed;
+
+  private final Boolean iframeMessaging;
+
+  private final CustomerParams customer;
+
+  private final InvoiceParams invoice;
+
+  private final CardParams card;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<AddonsParams> addons;
+
+  private final List<ChargesParams> charges;
+
+  private HostedPageCheckoutOneTimeParams(HostedPageCheckoutOneTimeBuilder builder) {
+
+    this.currencyCode = builder.currencyCode;
+
+    this.invoiceNote = builder.invoiceNote;
+
+    this.coupon = builder.coupon;
+
+    this.couponIds = builder.couponIds;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.cancelUrl = builder.cancelUrl;
+
+    this.passThruContent = builder.passThruContent;
+
+    this.embed = builder.embed;
+
+    this.iframeMessaging = builder.iframeMessaging;
+
+    this.customer = builder.customer;
+
+    this.invoice = builder.invoice;
+
+    this.card = builder.card;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.addons = builder.addons;
+
+    this.charges = builder.charges;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getInvoiceNote() {
+    return invoiceNote;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public String getCancelUrl() {
+    return cancelUrl;
+  }
+
+  public String getPassThruContent() {
+    return passThruContent;
+  }
+
+  public Boolean getEmbed() {
+    return embed;
+  }
+
+  public Boolean getIframeMessaging() {
+    return iframeMessaging;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public InvoiceParams getInvoice() {
+    return invoice;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<ChargesParams> getCharges() {
+    return charges;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.invoiceNote != null) {
+
+      formData.put("invoice_note", this.invoiceNote);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.cancelUrl != null) {
+
+      formData.put("cancel_url", this.cancelUrl);
+    }
+
+    if (this.passThruContent != null) {
+
+      formData.put("pass_thru_content", this.passThruContent);
+    }
+
+    if (this.embed != null) {
+
+      formData.put("embed", this.embed);
+    }
+
+    if (this.iframeMessaging != null) {
+
+      formData.put("iframe_messaging", this.iframeMessaging);
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.invoice != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.invoice.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "invoice[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.charges != null) {
+
+      // List of objects
+      for (int i = 0; i < this.charges.size(); i++) {
+        ChargesParams item = this.charges.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageCheckoutOneTimeParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageCheckoutOneTimeBuilder builder() {
+    return new HostedPageCheckoutOneTimeBuilder();
+  }
+
+  public static final class HostedPageCheckoutOneTimeBuilder {
+
+    private String currencyCode;
+
+    private String invoiceNote;
+
+    private String coupon;
+
+    private List<String> couponIds;
+
+    private String redirectUrl;
+
+    private String cancelUrl;
+
+    private String passThruContent;
+
+    private Boolean embed;
+
+    private Boolean iframeMessaging;
+
+    private CustomerParams customer;
+
+    private InvoiceParams invoice;
+
+    private CardParams card;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<AddonsParams> addons;
+
+    private List<ChargesParams> charges;
+
+    private HostedPageCheckoutOneTimeBuilder() {}
+
+    public HostedPageCheckoutOneTimeBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder invoiceNote(String value) {
+      this.invoiceNote = value;
+      return this;
+    }
+
+    @Deprecated
+    public HostedPageCheckoutOneTimeBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder cancelUrl(String value) {
+      this.cancelUrl = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder passThruContent(String value) {
+      this.passThruContent = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder embed(Boolean value) {
+      this.embed = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder iframeMessaging(Boolean value) {
+      this.iframeMessaging = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder invoice(InvoiceParams value) {
+      this.invoice = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeBuilder charges(List<ChargesParams> value) {
+      this.charges = value;
+      return this;
+    }
+
+    public HostedPageCheckoutOneTimeParams build() {
+      return new HostedPageCheckoutOneTimeParams(this);
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private final String email;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String locale;
+
+    private final Taxability taxability;
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final Boolean consolidatedInvoicing;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.email = builder.email;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.locale = builder.locale;
+
+      this.taxability = builder.taxability;
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.consolidatedInvoicing = builder.consolidatedInvoicing;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLocale() {
+      return locale;
+    }
+
+    public Taxability getTaxability() {
+      return taxability;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public Boolean getConsolidatedInvoicing() {
+      return consolidatedInvoicing;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.locale != null) {
+
+        formData.put("locale", this.locale);
+      }
+
+      if (this.taxability != null) {
+
+        formData.put("taxability", this.taxability);
+      }
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.consolidatedInvoicing != null) {
+
+        formData.put("consolidated_invoicing", this.consolidatedInvoicing);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private String email;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String company;
+
+      private String phone;
+
+      private String locale;
+
+      private Taxability taxability;
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private Boolean consolidatedInvoicing;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CustomerBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CustomerBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public CustomerBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public CustomerBuilder locale(String value) {
+        this.locale = value;
+        return this;
+      }
+
+      public CustomerBuilder taxability(Taxability value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder consolidatedInvoicing(Boolean value) {
+        this.consolidatedInvoicing = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+
+    public enum Taxability {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Taxability was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Taxability(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Taxability fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Taxability enumValue : Taxability.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class InvoiceParams {
+
+    private final String poNumber;
+
+    private InvoiceParams(InvoiceBuilder builder) {
+
+      this.poNumber = builder.poNumber;
+    }
+
+    public String getPoNumber() {
+      return poNumber;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.poNumber != null) {
+
+        formData.put("po_number", this.poNumber);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceBuilder builder() {
+      return new InvoiceBuilder();
+    }
+
+    public static final class InvoiceBuilder {
+
+      private String poNumber;
+
+      private InvoiceBuilder() {}
+
+      public InvoiceBuilder poNumber(String value) {
+        this.poNumber = value;
+        return this;
+      }
+
+      public InvoiceParams build() {
+        return new InvoiceParams(this);
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public AddonsBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class ChargesParams {
+
+    private final Long amount;
+
+    private final String amountInDecimal;
+
+    private final String description;
+
+    private final Boolean taxable;
+
+    private final String taxProfileId;
+
+    private final String avalaraTaxCode;
+
+    private final String hsnCode;
+
+    private final String taxjarProductCode;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ChargesParams(ChargesBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.description = builder.description;
+
+      this.taxable = builder.taxable;
+
+      this.taxProfileId = builder.taxProfileId;
+
+      this.avalaraTaxCode = builder.avalaraTaxCode;
+
+      this.hsnCode = builder.hsnCode;
+
+      this.taxjarProductCode = builder.taxjarProductCode;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Boolean getTaxable() {
+      return taxable;
+    }
+
+    public String getTaxProfileId() {
+      return taxProfileId;
+    }
+
+    public String getAvalaraTaxCode() {
+      return avalaraTaxCode;
+    }
+
+    public String getHsnCode() {
+      return hsnCode;
+    }
+
+    public String getTaxjarProductCode() {
+      return taxjarProductCode;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.taxable != null) {
+
+        formData.put("taxable", this.taxable);
+      }
+
+      if (this.taxProfileId != null) {
+
+        formData.put("tax_profile_id", this.taxProfileId);
+      }
+
+      if (this.avalaraTaxCode != null) {
+
+        formData.put("avalara_tax_code", this.avalaraTaxCode);
+      }
+
+      if (this.hsnCode != null) {
+
+        formData.put("hsn_code", this.hsnCode);
+      }
+
+      if (this.taxjarProductCode != null) {
+
+        formData.put("taxjar_product_code", this.taxjarProductCode);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargesBuilder builder() {
+      return new ChargesBuilder();
+    }
+
+    public static final class ChargesBuilder {
+
+      private Long amount;
+
+      private String amountInDecimal;
+
+      private String description;
+
+      private Boolean taxable;
+
+      private String taxProfileId;
+
+      private String avalaraTaxCode;
+
+      private String hsnCode;
+
+      private String taxjarProductCode;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ChargesBuilder() {}
+
+      public ChargesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public ChargesBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public ChargesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public ChargesBuilder taxable(Boolean value) {
+        this.taxable = value;
+        return this;
+      }
+
+      public ChargesBuilder taxProfileId(String value) {
+        this.taxProfileId = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTaxCode(String value) {
+        this.avalaraTaxCode = value;
+        return this;
+      }
+
+      public ChargesBuilder hsnCode(String value) {
+        this.hsnCode = value;
+        return this;
+      }
+
+      public ChargesBuilder taxjarProductCode(String value) {
+        this.taxjarProductCode = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public ChargesBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ChargesBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ChargesParams build() {
+        return new ChargesParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageClaimGiftParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageClaimGiftParams.java
new file mode 100644
index 00000000..d3f5c275
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageClaimGiftParams.java
@@ -0,0 +1,206 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class HostedPageClaimGiftParams {
+
+  private final String redirectUrl;
+
+  private final GiftParams gift;
+
+  private final CustomerParams customer;
+
+  private HostedPageClaimGiftParams(HostedPageClaimGiftBuilder builder) {
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.gift = builder.gift;
+
+    this.customer = builder.customer;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public GiftParams getGift() {
+    return gift;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.gift != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.gift.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "gift[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageClaimGiftParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageClaimGiftBuilder builder() {
+    return new HostedPageClaimGiftBuilder();
+  }
+
+  public static final class HostedPageClaimGiftBuilder {
+
+    private String redirectUrl;
+
+    private GiftParams gift;
+
+    private CustomerParams customer;
+
+    private HostedPageClaimGiftBuilder() {}
+
+    public HostedPageClaimGiftBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageClaimGiftBuilder gift(GiftParams value) {
+      this.gift = value;
+      return this;
+    }
+
+    public HostedPageClaimGiftBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public HostedPageClaimGiftParams build() {
+      return new HostedPageClaimGiftParams(this);
+    }
+  }
+
+  public static final class GiftParams {
+
+    private final String id;
+
+    private GiftParams(GiftBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GiftParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GiftBuilder builder() {
+      return new GiftBuilder();
+    }
+
+    public static final class GiftBuilder {
+
+      private String id;
+
+      private GiftBuilder() {}
+
+      public GiftBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public GiftParams build() {
+        return new GiftParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String locale;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.locale = builder.locale;
+    }
+
+    public String getLocale() {
+      return locale;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.locale != null) {
+
+        formData.put("locale", this.locale);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String locale;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder locale(String value) {
+        this.locale = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCollectNowParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCollectNowParams.java
new file mode 100644
index 00000000..376e45f8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageCollectNowParams.java
@@ -0,0 +1,381 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class HostedPageCollectNowParams {
+
+  private final String redirectUrl;
+
+  private final String currencyCode;
+
+  private final CustomerParams customer;
+
+  private final CardParams card;
+
+  private HostedPageCollectNowParams(HostedPageCollectNowBuilder builder) {
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageCollectNowParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageCollectNowBuilder builder() {
+    return new HostedPageCollectNowBuilder();
+  }
+
+  public static final class HostedPageCollectNowBuilder {
+
+    private String redirectUrl;
+
+    private String currencyCode;
+
+    private CustomerParams customer;
+
+    private CardParams card;
+
+    private HostedPageCollectNowBuilder() {}
+
+    public HostedPageCollectNowBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageCollectNowBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public HostedPageCollectNowBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public HostedPageCollectNowBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public HostedPageCollectNowParams build() {
+      return new HostedPageCollectNowParams(this);
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageEventsParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageEventsParams.java
new file mode 100644
index 00000000..ae1fe23f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageEventsParams.java
@@ -0,0 +1,128 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class HostedPageEventsParams {
+
+  private final EventName eventName;
+
+  private final Timestamp occurredAt;
+
+  private final java.util.Map<String, Object> eventData;
+
+  private HostedPageEventsParams(HostedPageEventsBuilder builder) {
+
+    this.eventName = builder.eventName;
+
+    this.occurredAt = builder.occurredAt;
+
+    this.eventData = builder.eventData;
+  }
+
+  public EventName getEventName() {
+    return eventName;
+  }
+
+  public Timestamp getOccurredAt() {
+    return occurredAt;
+  }
+
+  public java.util.Map<String, Object> getEventData() {
+    return eventData;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.eventName != null) {
+
+      formData.put("event_name", this.eventName);
+    }
+
+    if (this.occurredAt != null) {
+
+      formData.put("occurred_at", this.occurredAt);
+    }
+
+    if (this.eventData != null) {
+
+      formData.put("event_data", JsonUtil.toJson(this.eventData));
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageEventsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageEventsBuilder builder() {
+    return new HostedPageEventsBuilder();
+  }
+
+  public static final class HostedPageEventsBuilder {
+
+    private EventName eventName;
+
+    private Timestamp occurredAt;
+
+    private java.util.Map<String, Object> eventData;
+
+    private HostedPageEventsBuilder() {}
+
+    public HostedPageEventsBuilder eventName(EventName value) {
+      this.eventName = value;
+      return this;
+    }
+
+    public HostedPageEventsBuilder occurredAt(Timestamp value) {
+      this.occurredAt = value;
+      return this;
+    }
+
+    public HostedPageEventsBuilder eventData(java.util.Map<String, Object> value) {
+      this.eventData = value;
+      return this;
+    }
+
+    public HostedPageEventsParams build() {
+      return new HostedPageEventsParams(this);
+    }
+  }
+
+  public enum EventName {
+    CANCELLATION_PAGE_LOADED("cancellation_page_loaded"),
+
+    /** An enum member indicating that EventName was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    EventName(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static EventName fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (EventName enumValue : EventName.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageExtendSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageExtendSubscriptionParams.java
new file mode 100644
index 00000000..17a1f026
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageExtendSubscriptionParams.java
@@ -0,0 +1,153 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class HostedPageExtendSubscriptionParams {
+
+  private final Integer expiry;
+
+  private final Integer billingCycle;
+
+  private final SubscriptionParams subscription;
+
+  private HostedPageExtendSubscriptionParams(HostedPageExtendSubscriptionBuilder builder) {
+
+    this.expiry = builder.expiry;
+
+    this.billingCycle = builder.billingCycle;
+
+    this.subscription = builder.subscription;
+  }
+
+  public Integer getExpiry() {
+    return expiry;
+  }
+
+  public Integer getBillingCycle() {
+    return billingCycle;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.expiry != null) {
+
+      formData.put("expiry", this.expiry);
+    }
+
+    if (this.billingCycle != null) {
+
+      formData.put("billing_cycle", this.billingCycle);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageExtendSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageExtendSubscriptionBuilder builder() {
+    return new HostedPageExtendSubscriptionBuilder();
+  }
+
+  public static final class HostedPageExtendSubscriptionBuilder {
+
+    private Integer expiry;
+
+    private Integer billingCycle;
+
+    private SubscriptionParams subscription;
+
+    private HostedPageExtendSubscriptionBuilder() {}
+
+    public HostedPageExtendSubscriptionBuilder expiry(Integer value) {
+      this.expiry = value;
+      return this;
+    }
+
+    public HostedPageExtendSubscriptionBuilder billingCycle(Integer value) {
+      this.billingCycle = value;
+      return this;
+    }
+
+    public HostedPageExtendSubscriptionBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public HostedPageExtendSubscriptionParams build() {
+      return new HostedPageExtendSubscriptionParams(this);
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageListParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageListParams.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageListParams.java
index 3cfc2225..92c85055 100644
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageListParams.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.hostedPage.params;
+package com.chargebee.v4.models.hostedPage.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageManagePaymentSourcesParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageManagePaymentSourcesParams.java
new file mode 100644
index 00000000..e09c4c96
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageManagePaymentSourcesParams.java
@@ -0,0 +1,361 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class HostedPageManagePaymentSourcesParams {
+
+  private final String redirectUrl;
+
+  private final CustomerParams customer;
+
+  private final CardParams card;
+
+  private HostedPageManagePaymentSourcesParams(HostedPageManagePaymentSourcesBuilder builder) {
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageManagePaymentSourcesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageManagePaymentSourcesBuilder builder() {
+    return new HostedPageManagePaymentSourcesBuilder();
+  }
+
+  public static final class HostedPageManagePaymentSourcesBuilder {
+
+    private String redirectUrl;
+
+    private CustomerParams customer;
+
+    private CardParams card;
+
+    private HostedPageManagePaymentSourcesBuilder() {}
+
+    public HostedPageManagePaymentSourcesBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageManagePaymentSourcesBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public HostedPageManagePaymentSourcesBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public HostedPageManagePaymentSourcesParams build() {
+      return new HostedPageManagePaymentSourcesParams(this);
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPagePreCancelParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPagePreCancelParams.java
new file mode 100644
index 00000000..0385991b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPagePreCancelParams.java
@@ -0,0 +1,173 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class HostedPagePreCancelParams {
+
+  private final String passThruContent;
+
+  private final String cancelUrl;
+
+  private final String redirectUrl;
+
+  private final SubscriptionParams subscription;
+
+  private HostedPagePreCancelParams(HostedPagePreCancelBuilder builder) {
+
+    this.passThruContent = builder.passThruContent;
+
+    this.cancelUrl = builder.cancelUrl;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.subscription = builder.subscription;
+  }
+
+  public String getPassThruContent() {
+    return passThruContent;
+  }
+
+  public String getCancelUrl() {
+    return cancelUrl;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.passThruContent != null) {
+
+      formData.put("pass_thru_content", this.passThruContent);
+    }
+
+    if (this.cancelUrl != null) {
+
+      formData.put("cancel_url", this.cancelUrl);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPagePreCancelParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPagePreCancelBuilder builder() {
+    return new HostedPagePreCancelBuilder();
+  }
+
+  public static final class HostedPagePreCancelBuilder {
+
+    private String passThruContent;
+
+    private String cancelUrl;
+
+    private String redirectUrl;
+
+    private SubscriptionParams subscription;
+
+    private HostedPagePreCancelBuilder() {}
+
+    public HostedPagePreCancelBuilder passThruContent(String value) {
+      this.passThruContent = value;
+      return this;
+    }
+
+    public HostedPagePreCancelBuilder cancelUrl(String value) {
+      this.cancelUrl = value;
+      return this;
+    }
+
+    public HostedPagePreCancelBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPagePreCancelBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public HostedPagePreCancelParams build() {
+      return new HostedPagePreCancelParams(this);
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageRetrieveAgreementPdfParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageRetrieveAgreementPdfParams.java
new file mode 100644
index 00000000..a1c52997
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageRetrieveAgreementPdfParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class HostedPageRetrieveAgreementPdfParams {
+
+  private final String paymentSourceId;
+
+  private HostedPageRetrieveAgreementPdfParams(HostedPageRetrieveAgreementPdfBuilder builder) {
+
+    this.paymentSourceId = builder.paymentSourceId;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageRetrieveAgreementPdfParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageRetrieveAgreementPdfBuilder builder() {
+    return new HostedPageRetrieveAgreementPdfBuilder();
+  }
+
+  public static final class HostedPageRetrieveAgreementPdfBuilder {
+
+    private String paymentSourceId;
+
+    private HostedPageRetrieveAgreementPdfBuilder() {}
+
+    public HostedPageRetrieveAgreementPdfBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public HostedPageRetrieveAgreementPdfParams build() {
+      return new HostedPageRetrieveAgreementPdfParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageRetrieveParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageRetrieveParams.java
index 8059ebcd..dba3ae38 100644
--- a/src/main/java/com/chargebee/v4/core/models/hostedPage/params/HostedPageRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.hostedPage.params;
+package com.chargebee.v4.models.hostedPage.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageUpdateCardParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageUpdateCardParams.java
new file mode 100644
index 00000000..9fb81ae5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageUpdateCardParams.java
@@ -0,0 +1,483 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class HostedPageUpdateCardParams {
+
+  private final String redirectUrl;
+
+  private final String cancelUrl;
+
+  private final String passThruContent;
+
+  private final Boolean iframeMessaging;
+
+  private final CustomerParams customer;
+
+  private final CardParams card;
+
+  private final Boolean embed;
+
+  private HostedPageUpdateCardParams(HostedPageUpdateCardBuilder builder) {
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.cancelUrl = builder.cancelUrl;
+
+    this.passThruContent = builder.passThruContent;
+
+    this.iframeMessaging = builder.iframeMessaging;
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+
+    this.embed = builder.embed;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public String getCancelUrl() {
+    return cancelUrl;
+  }
+
+  public String getPassThruContent() {
+    return passThruContent;
+  }
+
+  public Boolean getIframeMessaging() {
+    return iframeMessaging;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public Boolean getEmbed() {
+    return embed;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.cancelUrl != null) {
+
+      formData.put("cancel_url", this.cancelUrl);
+    }
+
+    if (this.passThruContent != null) {
+
+      formData.put("pass_thru_content", this.passThruContent);
+    }
+
+    if (this.iframeMessaging != null) {
+
+      formData.put("iframe_messaging", this.iframeMessaging);
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.embed != null) {
+
+      formData.put("embed", this.embed);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageUpdateCardParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageUpdateCardBuilder builder() {
+    return new HostedPageUpdateCardBuilder();
+  }
+
+  public static final class HostedPageUpdateCardBuilder {
+
+    private String redirectUrl;
+
+    private String cancelUrl;
+
+    private String passThruContent;
+
+    private Boolean iframeMessaging;
+
+    private CustomerParams customer;
+
+    private CardParams card;
+
+    private Boolean embed;
+
+    private HostedPageUpdateCardBuilder() {}
+
+    public HostedPageUpdateCardBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageUpdateCardBuilder cancelUrl(String value) {
+      this.cancelUrl = value;
+      return this;
+    }
+
+    public HostedPageUpdateCardBuilder passThruContent(String value) {
+      this.passThruContent = value;
+      return this;
+    }
+
+    public HostedPageUpdateCardBuilder iframeMessaging(Boolean value) {
+      this.iframeMessaging = value;
+      return this;
+    }
+
+    public HostedPageUpdateCardBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public HostedPageUpdateCardBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public HostedPageUpdateCardBuilder embed(Boolean value) {
+      this.embed = value;
+      return this;
+    }
+
+    public HostedPageUpdateCardParams build() {
+      return new HostedPageUpdateCardParams(this);
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      @Deprecated
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      @Deprecated
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageUpdatePaymentMethodParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageUpdatePaymentMethodParams.java
new file mode 100644
index 00000000..67d692e2
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageUpdatePaymentMethodParams.java
@@ -0,0 +1,483 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class HostedPageUpdatePaymentMethodParams {
+
+  private final String redirectUrl;
+
+  private final String cancelUrl;
+
+  private final String passThruContent;
+
+  private final Boolean iframeMessaging;
+
+  private final CustomerParams customer;
+
+  private final CardParams card;
+
+  private final Boolean embed;
+
+  private HostedPageUpdatePaymentMethodParams(HostedPageUpdatePaymentMethodBuilder builder) {
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.cancelUrl = builder.cancelUrl;
+
+    this.passThruContent = builder.passThruContent;
+
+    this.iframeMessaging = builder.iframeMessaging;
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+
+    this.embed = builder.embed;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public String getCancelUrl() {
+    return cancelUrl;
+  }
+
+  public String getPassThruContent() {
+    return passThruContent;
+  }
+
+  public Boolean getIframeMessaging() {
+    return iframeMessaging;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public Boolean getEmbed() {
+    return embed;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.cancelUrl != null) {
+
+      formData.put("cancel_url", this.cancelUrl);
+    }
+
+    if (this.passThruContent != null) {
+
+      formData.put("pass_thru_content", this.passThruContent);
+    }
+
+    if (this.iframeMessaging != null) {
+
+      formData.put("iframe_messaging", this.iframeMessaging);
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.embed != null) {
+
+      formData.put("embed", this.embed);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageUpdatePaymentMethodParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageUpdatePaymentMethodBuilder builder() {
+    return new HostedPageUpdatePaymentMethodBuilder();
+  }
+
+  public static final class HostedPageUpdatePaymentMethodBuilder {
+
+    private String redirectUrl;
+
+    private String cancelUrl;
+
+    private String passThruContent;
+
+    private Boolean iframeMessaging;
+
+    private CustomerParams customer;
+
+    private CardParams card;
+
+    private Boolean embed;
+
+    private HostedPageUpdatePaymentMethodBuilder() {}
+
+    public HostedPageUpdatePaymentMethodBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public HostedPageUpdatePaymentMethodBuilder cancelUrl(String value) {
+      this.cancelUrl = value;
+      return this;
+    }
+
+    public HostedPageUpdatePaymentMethodBuilder passThruContent(String value) {
+      this.passThruContent = value;
+      return this;
+    }
+
+    public HostedPageUpdatePaymentMethodBuilder iframeMessaging(Boolean value) {
+      this.iframeMessaging = value;
+      return this;
+    }
+
+    public HostedPageUpdatePaymentMethodBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public HostedPageUpdatePaymentMethodBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public HostedPageUpdatePaymentMethodBuilder embed(Boolean value) {
+      this.embed = value;
+      return this;
+    }
+
+    public HostedPageUpdatePaymentMethodParams build() {
+      return new HostedPageUpdatePaymentMethodParams(this);
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      @Deprecated
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      @Deprecated
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageViewVoucherParams.java b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageViewVoucherParams.java
new file mode 100644
index 00000000..f7371a8d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/params/HostedPageViewVoucherParams.java
@@ -0,0 +1,186 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.hostedPage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class HostedPageViewVoucherParams {
+
+  private final PaymentVoucherParams paymentVoucher;
+
+  private final CustomerParams customer;
+
+  private HostedPageViewVoucherParams(HostedPageViewVoucherBuilder builder) {
+
+    this.paymentVoucher = builder.paymentVoucher;
+
+    this.customer = builder.customer;
+  }
+
+  public PaymentVoucherParams getPaymentVoucher() {
+    return paymentVoucher;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.paymentVoucher != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentVoucher.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_voucher[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for HostedPageViewVoucherParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static HostedPageViewVoucherBuilder builder() {
+    return new HostedPageViewVoucherBuilder();
+  }
+
+  public static final class HostedPageViewVoucherBuilder {
+
+    private PaymentVoucherParams paymentVoucher;
+
+    private CustomerParams customer;
+
+    private HostedPageViewVoucherBuilder() {}
+
+    public HostedPageViewVoucherBuilder paymentVoucher(PaymentVoucherParams value) {
+      this.paymentVoucher = value;
+      return this;
+    }
+
+    public HostedPageViewVoucherBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public HostedPageViewVoucherParams build() {
+      return new HostedPageViewVoucherParams(this);
+    }
+  }
+
+  public static final class PaymentVoucherParams {
+
+    private final String id;
+
+    private PaymentVoucherParams(PaymentVoucherBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentVoucherParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentVoucherBuilder builder() {
+      return new PaymentVoucherBuilder();
+    }
+
+    public static final class PaymentVoucherBuilder {
+
+      private String id;
+
+      private PaymentVoucherBuilder() {}
+
+      public PaymentVoucherBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentVoucherParams build() {
+        return new PaymentVoucherParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String locale;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.locale = builder.locale;
+    }
+
+    public String getLocale() {
+      return locale;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.locale != null) {
+
+        formData.put("locale", this.locale);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String locale;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder locale(String value) {
+        this.locale = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageAcceptQuoteResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageAcceptQuoteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageAcceptQuoteResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageAcceptQuoteResponse.java
index 8e73dbf5..e203da08 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageAcceptQuoteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageAcceptQuoteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageAcknowledgeResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageAcknowledgeResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageAcknowledgeResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageAcknowledgeResponse.java
index dfc2406a..9da68a40 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageAcknowledgeResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageAcknowledgeResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutExistingForItemsResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutExistingForItemsResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutExistingForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutExistingForItemsResponse.java
index 259abfd3..370adfcc 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutExistingForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutExistingForItemsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutExistingResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutExistingResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutExistingResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutExistingResponse.java
index 2fd4ee76..98657a71 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutExistingResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutExistingResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutGiftForItemsResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutGiftForItemsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutGiftForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutGiftForItemsResponse.java
index 4cbb05ad..2e546505 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutGiftForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutGiftForItemsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutGiftResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutGiftResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutGiftResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutGiftResponse.java
index 6ed582a8..3b99eadb 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutGiftResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutGiftResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutNewForItemsResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutNewForItemsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutNewForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutNewForItemsResponse.java
index 5ddb89e2..243ca268 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutNewForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutNewForItemsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutNewResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutNewResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutNewResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutNewResponse.java
index d3c86adc..9fed5351 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutNewResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutNewResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutOneTimeForItemsResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutOneTimeForItemsResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutOneTimeForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutOneTimeForItemsResponse.java
index 8037534e..ca21f811 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutOneTimeForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutOneTimeForItemsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutOneTimeResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutOneTimeResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutOneTimeResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutOneTimeResponse.java
index 117081ef..d99bfab7 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCheckoutOneTimeResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCheckoutOneTimeResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageClaimGiftResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageClaimGiftResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageClaimGiftResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageClaimGiftResponse.java
index d430f412..b2acd0b5 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageClaimGiftResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageClaimGiftResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCollectNowResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCollectNowResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCollectNowResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCollectNowResponse.java
index 5543f5ab..a5e4a659 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageCollectNowResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageCollectNowResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageEventsResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageEventsResponse.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageEventsResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageEventsResponse.java
index 4d47de86..12865c9e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageEventsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageEventsResponse.java
@@ -1,6 +1,6 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageExtendSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageExtendSubscriptionResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageExtendSubscriptionResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageExtendSubscriptionResponse.java
index b12b570b..fcc49ecd 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageExtendSubscriptionResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageExtendSubscriptionResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageListResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageListResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageListResponse.java
index 11f8f410..d2410fd3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.HostedPageService;
-import com.chargebee.v4.core.models.hostedPage.params.HostedPageListParams;
+import com.chargebee.v4.services.HostedPageService;
+import com.chargebee.v4.models.hostedPage.params.HostedPageListParams;
 
 /** Immutable response object for HostedPageList operation. Contains paginated list data. */
 public final class HostedPageListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public HostedPageListResponse nextPage() throws Exception {
+  public HostedPageListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageManagePaymentSourcesResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageManagePaymentSourcesResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageManagePaymentSourcesResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageManagePaymentSourcesResponse.java
index 413307e8..7b943498 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageManagePaymentSourcesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageManagePaymentSourcesResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPagePreCancelResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPagePreCancelResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPagePreCancelResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPagePreCancelResponse.java
index 55bf0d1a..1b3a80bf 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPagePreCancelResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPagePreCancelResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageRetrieveAgreementPdfResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageRetrieveAgreementPdfResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageRetrieveAgreementPdfResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageRetrieveAgreementPdfResponse.java
index 2b356948..7d0977da 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageRetrieveAgreementPdfResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageRetrieveAgreementPdfResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageRetrieveResponse.java
new file mode 100644
index 00000000..92d6ca54
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.hostedPage.responses;
+
+import com.chargebee.v4.models.hostedPage.HostedPage;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for HostedPageRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class HostedPageRetrieveResponse extends BaseResponse {
+  private final HostedPage hostedPage;
+
+  private HostedPageRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.hostedPage = builder.hostedPage;
+  }
+
+  /** Parse JSON response into HostedPageRetrieveResponse object. */
+  public static HostedPageRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into HostedPageRetrieveResponse object with HTTP response. */
+  public static HostedPageRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __hostedPageJson = JsonUtil.getObject(json, "hosted_page");
+      if (__hostedPageJson != null) {
+        builder.hostedPage(HostedPage.fromJson(__hostedPageJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse HostedPageRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for HostedPageRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for HostedPageRetrieveResponse. */
+  public static class Builder {
+
+    private HostedPage hostedPage;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder hostedPage(HostedPage hostedPage) {
+      this.hostedPage = hostedPage;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public HostedPageRetrieveResponse build() {
+      return new HostedPageRetrieveResponse(this);
+    }
+  }
+
+  /** Get the hostedPage from the response. */
+  public HostedPage getHostedPage() {
+    return hostedPage;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageUpdateCardResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageUpdateCardResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageUpdateCardResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageUpdateCardResponse.java
index 2f5c4cb4..40bcc113 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageUpdateCardResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageUpdateCardResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageUpdatePaymentMethodResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageUpdatePaymentMethodResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageUpdatePaymentMethodResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageUpdatePaymentMethodResponse.java
index 0c2a41a9..0c42f55c 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageUpdatePaymentMethodResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageUpdatePaymentMethodResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageViewVoucherResponse.java b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageViewVoucherResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageViewVoucherResponse.java
rename to src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageViewVoucherResponse.java
index bd31d54c..9edfbc32 100644
--- a/src/main/java/com/chargebee/v4/core/responses/hostedPage/HostedPageViewVoucherResponse.java
+++ b/src/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageViewVoucherResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.hostedPage;
+package com.chargebee.v4.models.hostedPage.responses;
 
-import com.chargebee.v4.core.models.hostedPage.HostedPage;
+import com.chargebee.v4.models.hostedPage.HostedPage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/impactedCustomer/ImpactedCustomer.java b/src/main/java/com/chargebee/v4/models/impactedCustomer/ImpactedCustomer.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/impactedCustomer/ImpactedCustomer.java
rename to src/main/java/com/chargebee/v4/models/impactedCustomer/ImpactedCustomer.java
index b024a85c..bf4b481c 100644
--- a/src/main/java/com/chargebee/v4/core/models/impactedCustomer/ImpactedCustomer.java
+++ b/src/main/java/com/chargebee/v4/models/impactedCustomer/ImpactedCustomer.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.impactedCustomer;
+package com.chargebee.v4.models.impactedCustomer;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/impactedItem/ImpactedItem.java b/src/main/java/com/chargebee/v4/models/impactedItem/ImpactedItem.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/impactedItem/ImpactedItem.java
rename to src/main/java/com/chargebee/v4/models/impactedItem/ImpactedItem.java
index 748af364..71f9eae1 100644
--- a/src/main/java/com/chargebee/v4/core/models/impactedItem/ImpactedItem.java
+++ b/src/main/java/com/chargebee/v4/models/impactedItem/ImpactedItem.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.impactedItem;
+package com.chargebee.v4.models.impactedItem;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/impactedItemPrice/ImpactedItemPrice.java b/src/main/java/com/chargebee/v4/models/impactedItemPrice/ImpactedItemPrice.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/impactedItemPrice/ImpactedItemPrice.java
rename to src/main/java/com/chargebee/v4/models/impactedItemPrice/ImpactedItemPrice.java
index 485cf6e7..5335b7c3 100644
--- a/src/main/java/com/chargebee/v4/core/models/impactedItemPrice/ImpactedItemPrice.java
+++ b/src/main/java/com/chargebee/v4/models/impactedItemPrice/ImpactedItemPrice.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.impactedItemPrice;
+package com.chargebee.v4.models.impactedItemPrice;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/impactedSubscription/ImpactedSubscription.java b/src/main/java/com/chargebee/v4/models/impactedSubscription/ImpactedSubscription.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/impactedSubscription/ImpactedSubscription.java
rename to src/main/java/com/chargebee/v4/models/impactedSubscription/ImpactedSubscription.java
index dd50bd84..a18dfad2 100644
--- a/src/main/java/com/chargebee/v4/core/models/impactedSubscription/ImpactedSubscription.java
+++ b/src/main/java/com/chargebee/v4/models/impactedSubscription/ImpactedSubscription.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.impactedSubscription;
+package com.chargebee.v4.models.impactedSubscription;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/inAppSubscription/InAppSubscription.java b/src/main/java/com/chargebee/v4/models/inAppSubscription/InAppSubscription.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/inAppSubscription/InAppSubscription.java
rename to src/main/java/com/chargebee/v4/models/inAppSubscription/InAppSubscription.java
index a582259f..cf2f78a1 100644
--- a/src/main/java/com/chargebee/v4/core/models/inAppSubscription/InAppSubscription.java
+++ b/src/main/java/com/chargebee/v4/models/inAppSubscription/InAppSubscription.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.inAppSubscription;
+package com.chargebee.v4.models.inAppSubscription;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/models/inAppSubscription/params/InAppSubscriptionImportReceiptParams.java b/src/main/java/com/chargebee/v4/models/inAppSubscription/params/InAppSubscriptionImportReceiptParams.java
new file mode 100644
index 00000000..f37194ab
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/inAppSubscription/params/InAppSubscriptionImportReceiptParams.java
@@ -0,0 +1,226 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.inAppSubscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InAppSubscriptionImportReceiptParams {
+
+  private final String receipt;
+
+  private final ProductParams product;
+
+  private final CustomerParams customer;
+
+  private InAppSubscriptionImportReceiptParams(InAppSubscriptionImportReceiptBuilder builder) {
+
+    this.receipt = builder.receipt;
+
+    this.product = builder.product;
+
+    this.customer = builder.customer;
+  }
+
+  public String getReceipt() {
+    return receipt;
+  }
+
+  public ProductParams getProduct() {
+    return product;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.receipt != null) {
+
+      formData.put("receipt", this.receipt);
+    }
+
+    if (this.product != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.product.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "product[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InAppSubscriptionImportReceiptParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InAppSubscriptionImportReceiptBuilder builder() {
+    return new InAppSubscriptionImportReceiptBuilder();
+  }
+
+  public static final class InAppSubscriptionImportReceiptBuilder {
+
+    private String receipt;
+
+    private ProductParams product;
+
+    private CustomerParams customer;
+
+    private InAppSubscriptionImportReceiptBuilder() {}
+
+    public InAppSubscriptionImportReceiptBuilder receipt(String value) {
+      this.receipt = value;
+      return this;
+    }
+
+    public InAppSubscriptionImportReceiptBuilder product(ProductParams value) {
+      this.product = value;
+      return this;
+    }
+
+    public InAppSubscriptionImportReceiptBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public InAppSubscriptionImportReceiptParams build() {
+      return new InAppSubscriptionImportReceiptParams(this);
+    }
+  }
+
+  public static final class ProductParams {
+
+    private final String currencyCode;
+
+    private ProductParams(ProductBuilder builder) {
+
+      this.currencyCode = builder.currencyCode;
+    }
+
+    public String getCurrencyCode() {
+      return currencyCode;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.currencyCode != null) {
+
+        formData.put("currency_code", this.currencyCode);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ProductParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ProductBuilder builder() {
+      return new ProductBuilder();
+    }
+
+    public static final class ProductBuilder {
+
+      private String currencyCode;
+
+      private ProductBuilder() {}
+
+      public ProductBuilder currencyCode(String value) {
+        this.currencyCode = value;
+        return this;
+      }
+
+      public ProductParams build() {
+        return new ProductParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private final String email;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.email = builder.email;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private String email;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/inAppSubscription/params/InAppSubscriptionImportSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/inAppSubscription/params/InAppSubscriptionImportSubscriptionParams.java
new file mode 100644
index 00000000..ea7659c9
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/inAppSubscription/params/InAppSubscriptionImportSubscriptionParams.java
@@ -0,0 +1,348 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.inAppSubscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class InAppSubscriptionImportSubscriptionParams {
+
+  private final SubscriptionParams subscription;
+
+  private final CustomerParams customer;
+
+  private InAppSubscriptionImportSubscriptionParams(
+      InAppSubscriptionImportSubscriptionBuilder builder) {
+
+    this.subscription = builder.subscription;
+
+    this.customer = builder.customer;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InAppSubscriptionImportSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InAppSubscriptionImportSubscriptionBuilder builder() {
+    return new InAppSubscriptionImportSubscriptionBuilder();
+  }
+
+  public static final class InAppSubscriptionImportSubscriptionBuilder {
+
+    private SubscriptionParams subscription;
+
+    private CustomerParams customer;
+
+    private InAppSubscriptionImportSubscriptionBuilder() {}
+
+    public InAppSubscriptionImportSubscriptionBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public InAppSubscriptionImportSubscriptionBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public InAppSubscriptionImportSubscriptionParams build() {
+      return new InAppSubscriptionImportSubscriptionParams(this);
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final Timestamp startedAt;
+
+    private final Timestamp termStart;
+
+    private final Timestamp termEnd;
+
+    private final String productId;
+
+    private final String currencyCode;
+
+    private final String transactionId;
+
+    private final Boolean isTrial;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.startedAt = builder.startedAt;
+
+      this.termStart = builder.termStart;
+
+      this.termEnd = builder.termEnd;
+
+      this.productId = builder.productId;
+
+      this.currencyCode = builder.currencyCode;
+
+      this.transactionId = builder.transactionId;
+
+      this.isTrial = builder.isTrial;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getStartedAt() {
+      return startedAt;
+    }
+
+    public Timestamp getTermStart() {
+      return termStart;
+    }
+
+    public Timestamp getTermEnd() {
+      return termEnd;
+    }
+
+    public String getProductId() {
+      return productId;
+    }
+
+    public String getCurrencyCode() {
+      return currencyCode;
+    }
+
+    public String getTransactionId() {
+      return transactionId;
+    }
+
+    public Boolean getIsTrial() {
+      return isTrial;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.startedAt != null) {
+
+        formData.put("started_at", this.startedAt);
+      }
+
+      if (this.termStart != null) {
+
+        formData.put("term_start", this.termStart);
+      }
+
+      if (this.termEnd != null) {
+
+        formData.put("term_end", this.termEnd);
+      }
+
+      if (this.productId != null) {
+
+        formData.put("product_id", this.productId);
+      }
+
+      if (this.currencyCode != null) {
+
+        formData.put("currency_code", this.currencyCode);
+      }
+
+      if (this.transactionId != null) {
+
+        formData.put("transaction_id", this.transactionId);
+      }
+
+      if (this.isTrial != null) {
+
+        formData.put("is_trial", this.isTrial);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private Timestamp startedAt;
+
+      private Timestamp termStart;
+
+      private Timestamp termEnd;
+
+      private String productId;
+
+      private String currencyCode;
+
+      private String transactionId;
+
+      private Boolean isTrial;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startedAt(Timestamp value) {
+        this.startedAt = value;
+        return this;
+      }
+
+      public SubscriptionBuilder termStart(Timestamp value) {
+        this.termStart = value;
+        return this;
+      }
+
+      public SubscriptionBuilder termEnd(Timestamp value) {
+        this.termEnd = value;
+        return this;
+      }
+
+      public SubscriptionBuilder productId(String value) {
+        this.productId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder currencyCode(String value) {
+        this.currencyCode = value;
+        return this;
+      }
+
+      public SubscriptionBuilder transactionId(String value) {
+        this.transactionId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder isTrial(Boolean value) {
+        this.isTrial = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private final String email;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.email = builder.email;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private String email;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/inAppSubscription/params/InAppSubscriptionProcessReceiptParams.java b/src/main/java/com/chargebee/v4/models/inAppSubscription/params/InAppSubscriptionProcessReceiptParams.java
new file mode 100644
index 00000000..1456a283
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/inAppSubscription/params/InAppSubscriptionProcessReceiptParams.java
@@ -0,0 +1,386 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.inAppSubscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InAppSubscriptionProcessReceiptParams {
+
+  private final String receipt;
+
+  private final ProductParams product;
+
+  private final CustomerParams customer;
+
+  private InAppSubscriptionProcessReceiptParams(InAppSubscriptionProcessReceiptBuilder builder) {
+
+    this.receipt = builder.receipt;
+
+    this.product = builder.product;
+
+    this.customer = builder.customer;
+  }
+
+  public String getReceipt() {
+    return receipt;
+  }
+
+  public ProductParams getProduct() {
+    return product;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.receipt != null) {
+
+      formData.put("receipt", this.receipt);
+    }
+
+    if (this.product != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.product.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "product[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InAppSubscriptionProcessReceiptParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InAppSubscriptionProcessReceiptBuilder builder() {
+    return new InAppSubscriptionProcessReceiptBuilder();
+  }
+
+  public static final class InAppSubscriptionProcessReceiptBuilder {
+
+    private String receipt;
+
+    private ProductParams product;
+
+    private CustomerParams customer;
+
+    private InAppSubscriptionProcessReceiptBuilder() {}
+
+    public InAppSubscriptionProcessReceiptBuilder receipt(String value) {
+      this.receipt = value;
+      return this;
+    }
+
+    public InAppSubscriptionProcessReceiptBuilder product(ProductParams value) {
+      this.product = value;
+      return this;
+    }
+
+    public InAppSubscriptionProcessReceiptBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public InAppSubscriptionProcessReceiptParams build() {
+      return new InAppSubscriptionProcessReceiptParams(this);
+    }
+  }
+
+  public static final class ProductParams {
+
+    private final String id;
+
+    private final String currencyCode;
+
+    private final Integer price;
+
+    private final String name;
+
+    private final String priceInDecimal;
+
+    private final String period;
+
+    private final String periodUnit;
+
+    private ProductParams(ProductBuilder builder) {
+
+      this.id = builder.id;
+
+      this.currencyCode = builder.currencyCode;
+
+      this.price = builder.price;
+
+      this.name = builder.name;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getCurrencyCode() {
+      return currencyCode;
+    }
+
+    public Integer getPrice() {
+      return price;
+    }
+
+    public String getName() {
+      return name;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public String getPeriod() {
+      return period;
+    }
+
+    public String getPeriodUnit() {
+      return periodUnit;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.currencyCode != null) {
+
+        formData.put("currency_code", this.currencyCode);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.name != null) {
+
+        formData.put("name", this.name);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ProductParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ProductBuilder builder() {
+      return new ProductBuilder();
+    }
+
+    public static final class ProductBuilder {
+
+      private String id;
+
+      private String currencyCode;
+
+      private Integer price;
+
+      private String name;
+
+      private String priceInDecimal;
+
+      private String period;
+
+      private String periodUnit;
+
+      private ProductBuilder() {}
+
+      public ProductBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public ProductBuilder currencyCode(String value) {
+        this.currencyCode = value;
+        return this;
+      }
+
+      public ProductBuilder price(Integer value) {
+        this.price = value;
+        return this;
+      }
+
+      public ProductBuilder name(String value) {
+        this.name = value;
+        return this;
+      }
+
+      public ProductBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ProductBuilder period(String value) {
+        this.period = value;
+        return this;
+      }
+
+      public ProductBuilder periodUnit(String value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public ProductParams build() {
+        return new ProductParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private final String email;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.email = builder.email;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private String email;
+
+      private String firstName;
+
+      private String lastName;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CustomerBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/inAppSubscription/params/InAppSubscriptionRetrieveStoreSubscriptionsParams.java b/src/main/java/com/chargebee/v4/models/inAppSubscription/params/InAppSubscriptionRetrieveStoreSubscriptionsParams.java
new file mode 100644
index 00000000..5aeb7def
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/inAppSubscription/params/InAppSubscriptionRetrieveStoreSubscriptionsParams.java
@@ -0,0 +1,61 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.inAppSubscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InAppSubscriptionRetrieveStoreSubscriptionsParams {
+
+  private final String receipt;
+
+  private InAppSubscriptionRetrieveStoreSubscriptionsParams(
+      InAppSubscriptionRetrieveStoreSubscriptionsBuilder builder) {
+
+    this.receipt = builder.receipt;
+  }
+
+  public String getReceipt() {
+    return receipt;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.receipt != null) {
+
+      formData.put("receipt", this.receipt);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InAppSubscriptionRetrieveStoreSubscriptionsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InAppSubscriptionRetrieveStoreSubscriptionsBuilder builder() {
+    return new InAppSubscriptionRetrieveStoreSubscriptionsBuilder();
+  }
+
+  public static final class InAppSubscriptionRetrieveStoreSubscriptionsBuilder {
+
+    private String receipt;
+
+    private InAppSubscriptionRetrieveStoreSubscriptionsBuilder() {}
+
+    public InAppSubscriptionRetrieveStoreSubscriptionsBuilder receipt(String value) {
+      this.receipt = value;
+      return this;
+    }
+
+    public InAppSubscriptionRetrieveStoreSubscriptionsParams build() {
+      return new InAppSubscriptionRetrieveStoreSubscriptionsParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/inAppSubscription/InAppSubscriptionImportReceiptResponse.java b/src/main/java/com/chargebee/v4/models/inAppSubscription/responses/InAppSubscriptionImportReceiptResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/inAppSubscription/InAppSubscriptionImportReceiptResponse.java
rename to src/main/java/com/chargebee/v4/models/inAppSubscription/responses/InAppSubscriptionImportReceiptResponse.java
index e7c56181..29066aac 100644
--- a/src/main/java/com/chargebee/v4/core/responses/inAppSubscription/InAppSubscriptionImportReceiptResponse.java
+++ b/src/main/java/com/chargebee/v4/models/inAppSubscription/responses/InAppSubscriptionImportReceiptResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.inAppSubscription;
+package com.chargebee.v4.models.inAppSubscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.inAppSubscription.InAppSubscription;
+import com.chargebee.v4.models.inAppSubscription.InAppSubscription;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/inAppSubscription/InAppSubscriptionImportSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/inAppSubscription/responses/InAppSubscriptionImportSubscriptionResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/inAppSubscription/InAppSubscriptionImportSubscriptionResponse.java
rename to src/main/java/com/chargebee/v4/models/inAppSubscription/responses/InAppSubscriptionImportSubscriptionResponse.java
index d8b7ae91..1e8ccbf6 100644
--- a/src/main/java/com/chargebee/v4/core/responses/inAppSubscription/InAppSubscriptionImportSubscriptionResponse.java
+++ b/src/main/java/com/chargebee/v4/models/inAppSubscription/responses/InAppSubscriptionImportSubscriptionResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.inAppSubscription;
+package com.chargebee.v4.models.inAppSubscription.responses;
 
-import com.chargebee.v4.core.models.inAppSubscription.InAppSubscription;
+import com.chargebee.v4.models.inAppSubscription.InAppSubscription;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/inAppSubscription/InAppSubscriptionProcessReceiptResponse.java b/src/main/java/com/chargebee/v4/models/inAppSubscription/responses/InAppSubscriptionProcessReceiptResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/inAppSubscription/InAppSubscriptionProcessReceiptResponse.java
rename to src/main/java/com/chargebee/v4/models/inAppSubscription/responses/InAppSubscriptionProcessReceiptResponse.java
index 61995ed6..4d8469fc 100644
--- a/src/main/java/com/chargebee/v4/core/responses/inAppSubscription/InAppSubscriptionProcessReceiptResponse.java
+++ b/src/main/java/com/chargebee/v4/models/inAppSubscription/responses/InAppSubscriptionProcessReceiptResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.inAppSubscription;
+package com.chargebee.v4.models.inAppSubscription.responses;
 
-import com.chargebee.v4.core.models.inAppSubscription.InAppSubscription;
+import com.chargebee.v4.models.inAppSubscription.InAppSubscription;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/inAppSubscription/responses/InAppSubscriptionRetrieveStoreSubscriptionsResponse.java b/src/main/java/com/chargebee/v4/models/inAppSubscription/responses/InAppSubscriptionRetrieveStoreSubscriptionsResponse.java
new file mode 100644
index 00000000..9458295a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/inAppSubscription/responses/InAppSubscriptionRetrieveStoreSubscriptionsResponse.java
@@ -0,0 +1,84 @@
+package com.chargebee.v4.models.inAppSubscription.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.inAppSubscription.InAppSubscription;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for InAppSubscriptionRetrieveStoreSubscriptions operation. Contains the
+ * response data from the API.
+ */
+public final class InAppSubscriptionRetrieveStoreSubscriptionsResponse extends BaseResponse {
+  private final List<InAppSubscription> inAppSubscriptions;
+
+  private InAppSubscriptionRetrieveStoreSubscriptionsResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.inAppSubscriptions = builder.inAppSubscriptions;
+  }
+
+  /** Parse JSON response into InAppSubscriptionRetrieveStoreSubscriptionsResponse object. */
+  public static InAppSubscriptionRetrieveStoreSubscriptionsResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into InAppSubscriptionRetrieveStoreSubscriptionsResponse object with HTTP
+   * response.
+   */
+  public static InAppSubscriptionRetrieveStoreSubscriptionsResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.inAppSubscriptions(
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "in_app_subscriptions")).stream()
+              .map(InAppSubscription::fromJson)
+              .collect(java.util.stream.Collectors.toList()));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse InAppSubscriptionRetrieveStoreSubscriptionsResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for InAppSubscriptionRetrieveStoreSubscriptionsResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for InAppSubscriptionRetrieveStoreSubscriptionsResponse. */
+  public static class Builder {
+
+    private List<InAppSubscription> inAppSubscriptions;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder inAppSubscriptions(List<InAppSubscription> inAppSubscriptions) {
+      this.inAppSubscriptions = inAppSubscriptions;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public InAppSubscriptionRetrieveStoreSubscriptionsResponse build() {
+      return new InAppSubscriptionRetrieveStoreSubscriptionsResponse(this);
+    }
+  }
+
+  /** Get the inAppSubscriptions from the response. */
+  public List<InAppSubscription> getInAppSubscriptions() {
+    return inAppSubscriptions;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/Invoice.java b/src/main/java/com/chargebee/v4/models/invoice/Invoice.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/invoice/Invoice.java
rename to src/main/java/com/chargebee/v4/models/invoice/Invoice.java
index 296e2e4d..620e61c4 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoice/Invoice.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/Invoice.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.invoice;
+package com.chargebee.v4.models.invoice;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.math.BigDecimal;
@@ -46,6 +46,7 @@ public class Invoice {
   private Timestamp voidedAt;
   private Long resourceVersion;
   private Timestamp updatedAt;
+  private String lineItemsNextOffset;
   private Boolean firstInvoice;
   private Long newSalesAmount;
   private Boolean hasAdvanceCharges;
@@ -84,7 +85,7 @@ public class Invoice {
   private Einvoice einvoice;
   private SiteDetailsAtCreation siteDetailsAtCreation;
 
-  private java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+  private java.util.Map<String, String> customFields = new java.util.HashMap<>();
 
   public String getId() {
     return id;
@@ -214,6 +215,10 @@ public Timestamp getUpdatedAt() {
     return updatedAt;
   }
 
+  public String getLineItemsNextOffset() {
+    return lineItemsNextOffset;
+  }
+
   public Boolean getFirstInvoice() {
     return firstInvoice;
   }
@@ -368,7 +373,7 @@ public SiteDetailsAtCreation getSiteDetailsAtCreation() {
    *
    * @return map containing all custom fields
    */
-  public java.util.Map<String, Object> getCustomFields() {
+  public java.util.Map<String, String> getCustomFields() {
     return customFields;
   }
 
@@ -378,7 +383,7 @@ public java.util.Map<String, Object> getCustomFields() {
    * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
    * @return the value of the custom field, or null if not present
    */
-  public Object getCustomField(String fieldName) {
+  public String getCustomField(String fieldName) {
     return customFields.get(fieldName);
   }
 
@@ -511,7 +516,7 @@ public static Channel fromString(String value) {
   public static Invoice fromJson(String json) {
     Invoice obj = new Invoice();
 
-    // Parse JSON to extract all keys
+    // Parse JSON to extract all keys for custom field extraction
     java.util.Set<String> knownFields = new java.util.HashSet<>();
 
     knownFields.add("id");
@@ -578,6 +583,8 @@ public static Invoice fromJson(String json) {
 
     knownFields.add("updated_at");
 
+    knownFields.add("line_items_next_offset");
+
     knownFields.add("first_invoice");
 
     knownFields.add("new_sales_amount");
@@ -716,6 +723,8 @@ public static Invoice fromJson(String json) {
 
     obj.updatedAt = JsonUtil.getTimestamp(json, "updated_at");
 
+    obj.lineItemsNextOffset = JsonUtil.getString(json, "line_items_next_offset");
+
     obj.firstInvoice = JsonUtil.getBoolean(json, "first_invoice");
 
     obj.newSalesAmount = JsonUtil.getLong(json, "new_sales_amount");
@@ -870,9 +879,9 @@ public static Invoice fromJson(String json) {
    * @param knownFields set of known field names
    * @return map of custom fields
    */
-  private static java.util.Map<String, Object> extractCustomFields(
+  private static java.util.Map<String, String> extractCustomFields(
       String json, java.util.Set<String> knownFields) {
-    java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+    java.util.Map<String, String> customFields = new java.util.HashMap<>();
     try {
       // Parse the entire JSON as a map
       java.util.Map<String, Object> allFields = JsonUtil.parseJsonObjectToMap(json);
@@ -881,7 +890,8 @@ private static java.util.Map<String, Object> extractCustomFields(
           String key = entry.getKey();
           // Include fields that start with "cf_" and are not in knownFields
           if (key != null && key.startsWith("cf_") && !knownFields.contains(key)) {
-            customFields.put(key, entry.getValue());
+            customFields.put(
+                key, entry.getValue() != null ? String.valueOf(entry.getValue()) : null);
           }
         }
       }
@@ -1729,6 +1739,7 @@ public static class Discounts {
 
     private Long amount;
     private String description;
+    private String lineItemId;
     private EntityType entityType;
     private DiscountType discountType;
     private String entityId;
@@ -1742,6 +1753,10 @@ public String getDescription() {
       return description;
     }
 
+    public String getLineItemId() {
+      return lineItemId;
+    }
+
     public EntityType getEntityType() {
       return entityType;
     }
@@ -1829,6 +1844,8 @@ public static Discounts fromJson(String json) {
 
       obj.description = JsonUtil.getString(json, "description");
 
+      obj.lineItemId = JsonUtil.getString(json, "line_item_id");
+
       obj.entityType = EntityType.fromString(JsonUtil.getString(json, "entity_type"));
 
       obj.discountType = DiscountType.fromString(JsonUtil.getString(json, "discount_type"));
@@ -2170,6 +2187,7 @@ public static class DunningAttempts {
     private Timestamp createdAt;
     private TxnStatus txnStatus;
     private Long txnAmount;
+    private RetryEngine retryEngine;
 
     public Integer getAttempt() {
       return attempt;
@@ -2195,6 +2213,10 @@ public Long getTxnAmount() {
       return txnAmount;
     }
 
+    public RetryEngine getRetryEngine() {
+      return retryEngine;
+    }
+
     public enum DunningType {
       AUTO_COLLECT("auto_collect"),
 
@@ -2263,6 +2285,36 @@ public static TxnStatus fromString(String value) {
       }
     }
 
+    public enum RetryEngine {
+      CHARGEBEE("chargebee"),
+
+      FLEXPAY("flexpay"),
+
+      SUCCESSPLUS("successplus"),
+
+      /** An enum member indicating that RetryEngine was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      RetryEngine(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static RetryEngine fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (RetryEngine enumValue : RetryEngine.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
     public static DunningAttempts fromJson(String json) {
       DunningAttempts obj = new DunningAttempts();
 
@@ -2278,6 +2330,8 @@ public static DunningAttempts fromJson(String json) {
 
       obj.txnAmount = JsonUtil.getLong(json, "txn_amount");
 
+      obj.retryEngine = RetryEngine.fromString(JsonUtil.getString(json, "retry_engine"));
+
       return obj;
     }
   }
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/DownloadEinvoiceParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/DownloadEinvoiceParams.java
new file mode 100644
index 00000000..7a292799
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/DownloadEinvoiceParams.java
@@ -0,0 +1,50 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class DownloadEinvoiceParams {
+
+  private final Map<String, Object> queryParams;
+
+  private DownloadEinvoiceParams(DownloadEinvoiceBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public DownloadEinvoiceBuilder toBuilder() {
+    DownloadEinvoiceBuilder builder = new DownloadEinvoiceBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for DownloadEinvoiceParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static DownloadEinvoiceBuilder builder() {
+    return new DownloadEinvoiceBuilder();
+  }
+
+  public static final class DownloadEinvoiceBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private DownloadEinvoiceBuilder() {}
+
+    public DownloadEinvoiceParams build() {
+      return new DownloadEinvoiceParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/ImportInvoiceParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/ImportInvoiceParams.java
new file mode 100644
index 00000000..60927894
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/ImportInvoiceParams.java
@@ -0,0 +1,3847 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class ImportInvoiceParams {
+
+  private final String id;
+
+  private final String currencyCode;
+
+  private final String customerId;
+
+  private final String subscriptionId;
+
+  private final String poNumber;
+
+  private final PriceType priceType;
+
+  private final TaxOverrideReason taxOverrideReason;
+
+  private final String vatNumber;
+
+  private final String vatNumberPrefix;
+
+  private final Timestamp date;
+
+  private final Long total;
+
+  private final Long roundOff;
+
+  private final Status status;
+
+  private final Timestamp voidedAt;
+
+  private final String voidReasonCode;
+
+  private final Boolean isWrittenOff;
+
+  private final Long writeOffAmount;
+
+  private final Timestamp writeOffDate;
+
+  private final Timestamp dueDate;
+
+  private final Integer netTermDays;
+
+  private final Boolean hasAdvanceCharges;
+
+  private final Boolean useForProration;
+
+  private final CreditNoteParams creditNote;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<LineItemsParams> lineItems;
+
+  private final List<PaymentReferenceNumbersParams> paymentReferenceNumbers;
+
+  private final List<LineItemTiersParams> lineItemTiers;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<TaxesParams> taxes;
+
+  private final List<PaymentsParams> payments;
+
+  private final List<NotesParams> notes;
+
+  private final List<LineItemAddressesParams> lineItemAddresses;
+
+  private final Map<String, String> customFields;
+
+  private ImportInvoiceParams(ImportInvoiceBuilder builder) {
+
+    this.id = builder.id;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.customerId = builder.customerId;
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.poNumber = builder.poNumber;
+
+    this.priceType = builder.priceType;
+
+    this.taxOverrideReason = builder.taxOverrideReason;
+
+    this.vatNumber = builder.vatNumber;
+
+    this.vatNumberPrefix = builder.vatNumberPrefix;
+
+    this.date = builder.date;
+
+    this.total = builder.total;
+
+    this.roundOff = builder.roundOff;
+
+    this.status = builder.status;
+
+    this.voidedAt = builder.voidedAt;
+
+    this.voidReasonCode = builder.voidReasonCode;
+
+    this.isWrittenOff = builder.isWrittenOff;
+
+    this.writeOffAmount = builder.writeOffAmount;
+
+    this.writeOffDate = builder.writeOffDate;
+
+    this.dueDate = builder.dueDate;
+
+    this.netTermDays = builder.netTermDays;
+
+    this.hasAdvanceCharges = builder.hasAdvanceCharges;
+
+    this.useForProration = builder.useForProration;
+
+    this.creditNote = builder.creditNote;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.lineItems = builder.lineItems;
+
+    this.paymentReferenceNumbers = builder.paymentReferenceNumbers;
+
+    this.lineItemTiers = builder.lineItemTiers;
+
+    this.discounts = builder.discounts;
+
+    this.taxes = builder.taxes;
+
+    this.payments = builder.payments;
+
+    this.notes = builder.notes;
+
+    this.lineItemAddresses = builder.lineItemAddresses;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public PriceType getPriceType() {
+    return priceType;
+  }
+
+  public TaxOverrideReason getTaxOverrideReason() {
+    return taxOverrideReason;
+  }
+
+  public String getVatNumber() {
+    return vatNumber;
+  }
+
+  public String getVatNumberPrefix() {
+    return vatNumberPrefix;
+  }
+
+  public Timestamp getDate() {
+    return date;
+  }
+
+  public Long getTotal() {
+    return total;
+  }
+
+  public Long getRoundOff() {
+    return roundOff;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public Timestamp getVoidedAt() {
+    return voidedAt;
+  }
+
+  public String getVoidReasonCode() {
+    return voidReasonCode;
+  }
+
+  public Boolean getIsWrittenOff() {
+    return isWrittenOff;
+  }
+
+  public Long getWriteOffAmount() {
+    return writeOffAmount;
+  }
+
+  public Timestamp getWriteOffDate() {
+    return writeOffDate;
+  }
+
+  public Timestamp getDueDate() {
+    return dueDate;
+  }
+
+  public Integer getNetTermDays() {
+    return netTermDays;
+  }
+
+  public Boolean getHasAdvanceCharges() {
+    return hasAdvanceCharges;
+  }
+
+  public Boolean getUseForProration() {
+    return useForProration;
+  }
+
+  public CreditNoteParams getCreditNote() {
+    return creditNote;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<LineItemsParams> getLineItems() {
+    return lineItems;
+  }
+
+  public List<PaymentReferenceNumbersParams> getPaymentReferenceNumbers() {
+    return paymentReferenceNumbers;
+  }
+
+  public List<LineItemTiersParams> getLineItemTiers() {
+    return lineItemTiers;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<TaxesParams> getTaxes() {
+    return taxes;
+  }
+
+  public List<PaymentsParams> getPayments() {
+    return payments;
+  }
+
+  public List<NotesParams> getNotes() {
+    return notes;
+  }
+
+  public List<LineItemAddressesParams> getLineItemAddresses() {
+    return lineItemAddresses;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.priceType != null) {
+
+      formData.put("price_type", this.priceType);
+    }
+
+    if (this.taxOverrideReason != null) {
+
+      formData.put("tax_override_reason", this.taxOverrideReason);
+    }
+
+    if (this.vatNumber != null) {
+
+      formData.put("vat_number", this.vatNumber);
+    }
+
+    if (this.vatNumberPrefix != null) {
+
+      formData.put("vat_number_prefix", this.vatNumberPrefix);
+    }
+
+    if (this.date != null) {
+
+      formData.put("date", this.date);
+    }
+
+    if (this.total != null) {
+
+      formData.put("total", this.total);
+    }
+
+    if (this.roundOff != null) {
+
+      formData.put("round_off", this.roundOff);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.voidedAt != null) {
+
+      formData.put("voided_at", this.voidedAt);
+    }
+
+    if (this.voidReasonCode != null) {
+
+      formData.put("void_reason_code", this.voidReasonCode);
+    }
+
+    if (this.isWrittenOff != null) {
+
+      formData.put("is_written_off", this.isWrittenOff);
+    }
+
+    if (this.writeOffAmount != null) {
+
+      formData.put("write_off_amount", this.writeOffAmount);
+    }
+
+    if (this.writeOffDate != null) {
+
+      formData.put("write_off_date", this.writeOffDate);
+    }
+
+    if (this.dueDate != null) {
+
+      formData.put("due_date", this.dueDate);
+    }
+
+    if (this.netTermDays != null) {
+
+      formData.put("net_term_days", this.netTermDays);
+    }
+
+    if (this.hasAdvanceCharges != null) {
+
+      formData.put("has_advance_charges", this.hasAdvanceCharges);
+    }
+
+    if (this.useForProration != null) {
+
+      formData.put("use_for_proration", this.useForProration);
+    }
+
+    if (this.creditNote != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.creditNote.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "credit_note[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.lineItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.lineItems.size(); i++) {
+        LineItemsParams item = this.lineItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "line_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.paymentReferenceNumbers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.paymentReferenceNumbers.size(); i++) {
+        PaymentReferenceNumbersParams item = this.paymentReferenceNumbers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "payment_reference_numbers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.lineItemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.lineItemTiers.size(); i++) {
+        LineItemTiersParams item = this.lineItemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "line_item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxes != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxes.size(); i++) {
+        TaxesParams item = this.taxes.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "taxes[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.payments != null) {
+
+      // List of objects
+      for (int i = 0; i < this.payments.size(); i++) {
+        PaymentsParams item = this.payments.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "payments[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.notes != null) {
+
+      // List of objects
+      for (int i = 0; i < this.notes.size(); i++) {
+        NotesParams item = this.notes.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "notes[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.lineItemAddresses != null) {
+
+      // List of objects
+      for (int i = 0; i < this.lineItemAddresses.size(); i++) {
+        LineItemAddressesParams item = this.lineItemAddresses.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "line_item_addresses[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for ImportInvoiceParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ImportInvoiceBuilder builder() {
+    return new ImportInvoiceBuilder();
+  }
+
+  public static final class ImportInvoiceBuilder {
+
+    private String id;
+
+    private String currencyCode;
+
+    private String customerId;
+
+    private String subscriptionId;
+
+    private String poNumber;
+
+    private PriceType priceType;
+
+    private TaxOverrideReason taxOverrideReason;
+
+    private String vatNumber;
+
+    private String vatNumberPrefix;
+
+    private Timestamp date;
+
+    private Long total;
+
+    private Long roundOff;
+
+    private Status status;
+
+    private Timestamp voidedAt;
+
+    private String voidReasonCode;
+
+    private Boolean isWrittenOff;
+
+    private Long writeOffAmount;
+
+    private Timestamp writeOffDate;
+
+    private Timestamp dueDate;
+
+    private Integer netTermDays;
+
+    private Boolean hasAdvanceCharges;
+
+    private Boolean useForProration;
+
+    private CreditNoteParams creditNote;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<LineItemsParams> lineItems;
+
+    private List<PaymentReferenceNumbersParams> paymentReferenceNumbers;
+
+    private List<LineItemTiersParams> lineItemTiers;
+
+    private List<DiscountsParams> discounts;
+
+    private List<TaxesParams> taxes;
+
+    private List<PaymentsParams> payments;
+
+    private List<NotesParams> notes;
+
+    private List<LineItemAddressesParams> lineItemAddresses;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private ImportInvoiceBuilder() {}
+
+    public ImportInvoiceBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder priceType(PriceType value) {
+      this.priceType = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder taxOverrideReason(TaxOverrideReason value) {
+      this.taxOverrideReason = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder vatNumber(String value) {
+      this.vatNumber = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder vatNumberPrefix(String value) {
+      this.vatNumberPrefix = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder date(Timestamp value) {
+      this.date = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder total(Long value) {
+      this.total = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder roundOff(Long value) {
+      this.roundOff = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder voidedAt(Timestamp value) {
+      this.voidedAt = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder voidReasonCode(String value) {
+      this.voidReasonCode = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder isWrittenOff(Boolean value) {
+      this.isWrittenOff = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder writeOffAmount(Long value) {
+      this.writeOffAmount = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder writeOffDate(Timestamp value) {
+      this.writeOffDate = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder dueDate(Timestamp value) {
+      this.dueDate = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder netTermDays(Integer value) {
+      this.netTermDays = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder hasAdvanceCharges(Boolean value) {
+      this.hasAdvanceCharges = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder useForProration(Boolean value) {
+      this.useForProration = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder creditNote(CreditNoteParams value) {
+      this.creditNote = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder lineItems(List<LineItemsParams> value) {
+      this.lineItems = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder paymentReferenceNumbers(List<PaymentReferenceNumbersParams> value) {
+      this.paymentReferenceNumbers = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder lineItemTiers(List<LineItemTiersParams> value) {
+      this.lineItemTiers = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder taxes(List<TaxesParams> value) {
+      this.taxes = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder payments(List<PaymentsParams> value) {
+      this.payments = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder notes(List<NotesParams> value) {
+      this.notes = value;
+      return this;
+    }
+
+    public ImportInvoiceBuilder lineItemAddresses(List<LineItemAddressesParams> value) {
+      this.lineItemAddresses = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public ImportInvoiceBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public ImportInvoiceBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public ImportInvoiceParams build() {
+      return new ImportInvoiceParams(this);
+    }
+  }
+
+  public enum PriceType {
+    TAX_EXCLUSIVE("tax_exclusive"),
+
+    TAX_INCLUSIVE("tax_inclusive"),
+
+    /** An enum member indicating that PriceType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PriceType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PriceType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PriceType enumValue : PriceType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TaxOverrideReason {
+    ID_EXEMPT("id_exempt"),
+
+    CUSTOMER_EXEMPT("customer_exempt"),
+
+    EXPORT("export"),
+
+    /** An enum member indicating that TaxOverrideReason was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TaxOverrideReason(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TaxOverrideReason fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TaxOverrideReason enumValue : TaxOverrideReason.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Status {
+    PAID("paid"),
+
+    POSTED("posted"),
+
+    PAYMENT_DUE("payment_due"),
+
+    NOT_PAID("not_paid"),
+
+    VOIDED("voided"),
+
+    PENDING("pending"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class CreditNoteParams {
+
+    private final String id;
+
+    private CreditNoteParams(CreditNoteBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreditNoteParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreditNoteBuilder builder() {
+      return new CreditNoteBuilder();
+    }
+
+    public static final class CreditNoteBuilder {
+
+      private String id;
+
+      private CreditNoteBuilder() {}
+
+      public CreditNoteBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CreditNoteParams build() {
+        return new CreditNoteParams(this);
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class LineItemsParams {
+
+    private final String id;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private final String subscriptionId;
+
+    private final String description;
+
+    private final Long unitAmount;
+
+    private final Integer quantity;
+
+    private final Long amount;
+
+    private final String unitAmountInDecimal;
+
+    private final String quantityInDecimal;
+
+    private final String amountInDecimal;
+
+    private final EntityType entityType;
+
+    private final String entityId;
+
+    private final String itemLevelDiscount1EntityId;
+
+    private final Long itemLevelDiscount1Amount;
+
+    private final String itemLevelDiscount2EntityId;
+
+    private final Long itemLevelDiscount2Amount;
+
+    private final String tax1Name;
+
+    private final Long tax1Amount;
+
+    private final String tax2Name;
+
+    private final Long tax2Amount;
+
+    private final String tax3Name;
+
+    private final Long tax3Amount;
+
+    private final String tax4Name;
+
+    private final Long tax4Amount;
+
+    private final String tax5Name;
+
+    private final Long tax5Amount;
+
+    private final String tax6Name;
+
+    private final Long tax6Amount;
+
+    private final String tax7Name;
+
+    private final Long tax7Amount;
+
+    private final String tax8Name;
+
+    private final Long tax8Amount;
+
+    private final String tax9Name;
+
+    private final Long tax9Amount;
+
+    private final String tax10Name;
+
+    private final Long tax10Amount;
+
+    private final Timestamp createdAt;
+
+    private LineItemsParams(LineItemsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+
+      this.subscriptionId = builder.subscriptionId;
+
+      this.description = builder.description;
+
+      this.unitAmount = builder.unitAmount;
+
+      this.quantity = builder.quantity;
+
+      this.amount = builder.amount;
+
+      this.unitAmountInDecimal = builder.unitAmountInDecimal;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.entityType = builder.entityType;
+
+      this.entityId = builder.entityId;
+
+      this.itemLevelDiscount1EntityId = builder.itemLevelDiscount1EntityId;
+
+      this.itemLevelDiscount1Amount = builder.itemLevelDiscount1Amount;
+
+      this.itemLevelDiscount2EntityId = builder.itemLevelDiscount2EntityId;
+
+      this.itemLevelDiscount2Amount = builder.itemLevelDiscount2Amount;
+
+      this.tax1Name = builder.tax1Name;
+
+      this.tax1Amount = builder.tax1Amount;
+
+      this.tax2Name = builder.tax2Name;
+
+      this.tax2Amount = builder.tax2Amount;
+
+      this.tax3Name = builder.tax3Name;
+
+      this.tax3Amount = builder.tax3Amount;
+
+      this.tax4Name = builder.tax4Name;
+
+      this.tax4Amount = builder.tax4Amount;
+
+      this.tax5Name = builder.tax5Name;
+
+      this.tax5Amount = builder.tax5Amount;
+
+      this.tax6Name = builder.tax6Name;
+
+      this.tax6Amount = builder.tax6Amount;
+
+      this.tax7Name = builder.tax7Name;
+
+      this.tax7Amount = builder.tax7Amount;
+
+      this.tax8Name = builder.tax8Name;
+
+      this.tax8Amount = builder.tax8Amount;
+
+      this.tax9Name = builder.tax9Name;
+
+      this.tax9Amount = builder.tax9Amount;
+
+      this.tax10Name = builder.tax10Name;
+
+      this.tax10Amount = builder.tax10Amount;
+
+      this.createdAt = builder.createdAt;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    public String getSubscriptionId() {
+      return subscriptionId;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Long getUnitAmount() {
+      return unitAmount;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getUnitAmountInDecimal() {
+      return unitAmountInDecimal;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    public String getItemLevelDiscount1EntityId() {
+      return itemLevelDiscount1EntityId;
+    }
+
+    public Long getItemLevelDiscount1Amount() {
+      return itemLevelDiscount1Amount;
+    }
+
+    public String getItemLevelDiscount2EntityId() {
+      return itemLevelDiscount2EntityId;
+    }
+
+    public Long getItemLevelDiscount2Amount() {
+      return itemLevelDiscount2Amount;
+    }
+
+    public String getTax1Name() {
+      return tax1Name;
+    }
+
+    public Long getTax1Amount() {
+      return tax1Amount;
+    }
+
+    public String getTax2Name() {
+      return tax2Name;
+    }
+
+    public Long getTax2Amount() {
+      return tax2Amount;
+    }
+
+    public String getTax3Name() {
+      return tax3Name;
+    }
+
+    public Long getTax3Amount() {
+      return tax3Amount;
+    }
+
+    public String getTax4Name() {
+      return tax4Name;
+    }
+
+    public Long getTax4Amount() {
+      return tax4Amount;
+    }
+
+    public String getTax5Name() {
+      return tax5Name;
+    }
+
+    public Long getTax5Amount() {
+      return tax5Amount;
+    }
+
+    public String getTax6Name() {
+      return tax6Name;
+    }
+
+    public Long getTax6Amount() {
+      return tax6Amount;
+    }
+
+    public String getTax7Name() {
+      return tax7Name;
+    }
+
+    public Long getTax7Amount() {
+      return tax7Amount;
+    }
+
+    public String getTax8Name() {
+      return tax8Name;
+    }
+
+    public Long getTax8Amount() {
+      return tax8Amount;
+    }
+
+    public String getTax9Name() {
+      return tax9Name;
+    }
+
+    public Long getTax9Amount() {
+      return tax9Amount;
+    }
+
+    public String getTax10Name() {
+      return tax10Name;
+    }
+
+    public Long getTax10Amount() {
+      return tax10Amount;
+    }
+
+    public Timestamp getCreatedAt() {
+      return createdAt;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      if (this.subscriptionId != null) {
+
+        formData.put("subscription_id", this.subscriptionId);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.unitAmount != null) {
+
+        formData.put("unit_amount", this.unitAmount);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.unitAmountInDecimal != null) {
+
+        formData.put("unit_amount_in_decimal", this.unitAmountInDecimal);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      if (this.itemLevelDiscount1EntityId != null) {
+
+        formData.put("item_level_discount1_entity_id", this.itemLevelDiscount1EntityId);
+      }
+
+      if (this.itemLevelDiscount1Amount != null) {
+
+        formData.put("item_level_discount1_amount", this.itemLevelDiscount1Amount);
+      }
+
+      if (this.itemLevelDiscount2EntityId != null) {
+
+        formData.put("item_level_discount2_entity_id", this.itemLevelDiscount2EntityId);
+      }
+
+      if (this.itemLevelDiscount2Amount != null) {
+
+        formData.put("item_level_discount2_amount", this.itemLevelDiscount2Amount);
+      }
+
+      if (this.tax1Name != null) {
+
+        formData.put("tax1_name", this.tax1Name);
+      }
+
+      if (this.tax1Amount != null) {
+
+        formData.put("tax1_amount", this.tax1Amount);
+      }
+
+      if (this.tax2Name != null) {
+
+        formData.put("tax2_name", this.tax2Name);
+      }
+
+      if (this.tax2Amount != null) {
+
+        formData.put("tax2_amount", this.tax2Amount);
+      }
+
+      if (this.tax3Name != null) {
+
+        formData.put("tax3_name", this.tax3Name);
+      }
+
+      if (this.tax3Amount != null) {
+
+        formData.put("tax3_amount", this.tax3Amount);
+      }
+
+      if (this.tax4Name != null) {
+
+        formData.put("tax4_name", this.tax4Name);
+      }
+
+      if (this.tax4Amount != null) {
+
+        formData.put("tax4_amount", this.tax4Amount);
+      }
+
+      if (this.tax5Name != null) {
+
+        formData.put("tax5_name", this.tax5Name);
+      }
+
+      if (this.tax5Amount != null) {
+
+        formData.put("tax5_amount", this.tax5Amount);
+      }
+
+      if (this.tax6Name != null) {
+
+        formData.put("tax6_name", this.tax6Name);
+      }
+
+      if (this.tax6Amount != null) {
+
+        formData.put("tax6_amount", this.tax6Amount);
+      }
+
+      if (this.tax7Name != null) {
+
+        formData.put("tax7_name", this.tax7Name);
+      }
+
+      if (this.tax7Amount != null) {
+
+        formData.put("tax7_amount", this.tax7Amount);
+      }
+
+      if (this.tax8Name != null) {
+
+        formData.put("tax8_name", this.tax8Name);
+      }
+
+      if (this.tax8Amount != null) {
+
+        formData.put("tax8_amount", this.tax8Amount);
+      }
+
+      if (this.tax9Name != null) {
+
+        formData.put("tax9_name", this.tax9Name);
+      }
+
+      if (this.tax9Amount != null) {
+
+        formData.put("tax9_amount", this.tax9Amount);
+      }
+
+      if (this.tax10Name != null) {
+
+        formData.put("tax10_name", this.tax10Name);
+      }
+
+      if (this.tax10Amount != null) {
+
+        formData.put("tax10_amount", this.tax10Amount);
+      }
+
+      if (this.createdAt != null) {
+
+        formData.put("created_at", this.createdAt);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LineItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LineItemsBuilder builder() {
+      return new LineItemsBuilder();
+    }
+
+    public static final class LineItemsBuilder {
+
+      private String id;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private String subscriptionId;
+
+      private String description;
+
+      private Long unitAmount;
+
+      private Integer quantity;
+
+      private Long amount;
+
+      private String unitAmountInDecimal;
+
+      private String quantityInDecimal;
+
+      private String amountInDecimal;
+
+      private EntityType entityType;
+
+      private String entityId;
+
+      private String itemLevelDiscount1EntityId;
+
+      private Long itemLevelDiscount1Amount;
+
+      private String itemLevelDiscount2EntityId;
+
+      private Long itemLevelDiscount2Amount;
+
+      private String tax1Name;
+
+      private Long tax1Amount;
+
+      private String tax2Name;
+
+      private Long tax2Amount;
+
+      private String tax3Name;
+
+      private Long tax3Amount;
+
+      private String tax4Name;
+
+      private Long tax4Amount;
+
+      private String tax5Name;
+
+      private Long tax5Amount;
+
+      private String tax6Name;
+
+      private Long tax6Amount;
+
+      private String tax7Name;
+
+      private Long tax7Amount;
+
+      private String tax8Name;
+
+      private Long tax8Amount;
+
+      private String tax9Name;
+
+      private Long tax9Amount;
+
+      private String tax10Name;
+
+      private Long tax10Amount;
+
+      private Timestamp createdAt;
+
+      private LineItemsBuilder() {}
+
+      public LineItemsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public LineItemsBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public LineItemsBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public LineItemsBuilder subscriptionId(String value) {
+        this.subscriptionId = value;
+        return this;
+      }
+
+      public LineItemsBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public LineItemsBuilder unitAmount(Long value) {
+        this.unitAmount = value;
+        return this;
+      }
+
+      public LineItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public LineItemsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder unitAmountInDecimal(String value) {
+        this.unitAmountInDecimal = value;
+        return this;
+      }
+
+      public LineItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public LineItemsBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public LineItemsBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public LineItemsBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public LineItemsBuilder itemLevelDiscount1EntityId(String value) {
+        this.itemLevelDiscount1EntityId = value;
+        return this;
+      }
+
+      public LineItemsBuilder itemLevelDiscount1Amount(Long value) {
+        this.itemLevelDiscount1Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder itemLevelDiscount2EntityId(String value) {
+        this.itemLevelDiscount2EntityId = value;
+        return this;
+      }
+
+      public LineItemsBuilder itemLevelDiscount2Amount(Long value) {
+        this.itemLevelDiscount2Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax1Name(String value) {
+        this.tax1Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax1Amount(Long value) {
+        this.tax1Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax2Name(String value) {
+        this.tax2Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax2Amount(Long value) {
+        this.tax2Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax3Name(String value) {
+        this.tax3Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax3Amount(Long value) {
+        this.tax3Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax4Name(String value) {
+        this.tax4Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax4Amount(Long value) {
+        this.tax4Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax5Name(String value) {
+        this.tax5Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax5Amount(Long value) {
+        this.tax5Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax6Name(String value) {
+        this.tax6Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax6Amount(Long value) {
+        this.tax6Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax7Name(String value) {
+        this.tax7Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax7Amount(Long value) {
+        this.tax7Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax8Name(String value) {
+        this.tax8Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax8Amount(Long value) {
+        this.tax8Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax9Name(String value) {
+        this.tax9Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax9Amount(Long value) {
+        this.tax9Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax10Name(String value) {
+        this.tax10Name = value;
+        return this;
+      }
+
+      public LineItemsBuilder tax10Amount(Long value) {
+        this.tax10Amount = value;
+        return this;
+      }
+
+      public LineItemsBuilder createdAt(Timestamp value) {
+        this.createdAt = value;
+        return this;
+      }
+
+      public LineItemsParams build() {
+        return new LineItemsParams(this);
+      }
+    }
+
+    public enum EntityType {
+      ADHOC("adhoc"),
+
+      PLAN_ITEM_PRICE("plan_item_price"),
+
+      ADDON_ITEM_PRICE("addon_item_price"),
+
+      CHARGE_ITEM_PRICE("charge_item_price"),
+
+      PLAN_SETUP("plan_setup"),
+
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentReferenceNumbersParams {
+
+    private final String id;
+
+    private final Type type;
+
+    private final String number;
+
+    private PaymentReferenceNumbersParams(PaymentReferenceNumbersBuilder builder) {
+
+      this.id = builder.id;
+
+      this.type = builder.type;
+
+      this.number = builder.number;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    public String getNumber() {
+      return number;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      if (this.number != null) {
+
+        formData.put("number", this.number);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentReferenceNumbersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentReferenceNumbersBuilder builder() {
+      return new PaymentReferenceNumbersBuilder();
+    }
+
+    public static final class PaymentReferenceNumbersBuilder {
+
+      private String id;
+
+      private Type type;
+
+      private String number;
+
+      private PaymentReferenceNumbersBuilder() {}
+
+      public PaymentReferenceNumbersBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentReferenceNumbersBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      public PaymentReferenceNumbersBuilder number(String value) {
+        this.number = value;
+        return this;
+      }
+
+      public PaymentReferenceNumbersParams build() {
+        return new PaymentReferenceNumbersParams(this);
+      }
+    }
+
+    public enum Type {
+      KID("kid"),
+
+      OCR("ocr"),
+
+      FRN("frn"),
+
+      FIK("fik"),
+
+      SWISS_REFERENCE("swiss_reference"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class LineItemTiersParams {
+
+    private final String lineItemId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Integer quantityUsed;
+
+    private final Long unitAmount;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String quantityUsedInDecimal;
+
+    private final String unitAmountInDecimal;
+
+    private LineItemTiersParams(LineItemTiersBuilder builder) {
+
+      this.lineItemId = builder.lineItemId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.quantityUsed = builder.quantityUsed;
+
+      this.unitAmount = builder.unitAmount;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.quantityUsedInDecimal = builder.quantityUsedInDecimal;
+
+      this.unitAmountInDecimal = builder.unitAmountInDecimal;
+    }
+
+    public String getLineItemId() {
+      return lineItemId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Integer getQuantityUsed() {
+      return quantityUsed;
+    }
+
+    public Long getUnitAmount() {
+      return unitAmount;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getQuantityUsedInDecimal() {
+      return quantityUsedInDecimal;
+    }
+
+    public String getUnitAmountInDecimal() {
+      return unitAmountInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.lineItemId != null) {
+
+        formData.put("line_item_id", this.lineItemId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.quantityUsed != null) {
+
+        formData.put("quantity_used", this.quantityUsed);
+      }
+
+      if (this.unitAmount != null) {
+
+        formData.put("unit_amount", this.unitAmount);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.quantityUsedInDecimal != null) {
+
+        formData.put("quantity_used_in_decimal", this.quantityUsedInDecimal);
+      }
+
+      if (this.unitAmountInDecimal != null) {
+
+        formData.put("unit_amount_in_decimal", this.unitAmountInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LineItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LineItemTiersBuilder builder() {
+      return new LineItemTiersBuilder();
+    }
+
+    public static final class LineItemTiersBuilder {
+
+      private String lineItemId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Integer quantityUsed;
+
+      private Long unitAmount;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String quantityUsedInDecimal;
+
+      private String unitAmountInDecimal;
+
+      private LineItemTiersBuilder() {}
+
+      public LineItemTiersBuilder lineItemId(String value) {
+        this.lineItemId = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder quantityUsed(Integer value) {
+        this.quantityUsed = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder unitAmount(Long value) {
+        this.unitAmount = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder quantityUsedInDecimal(String value) {
+        this.quantityUsedInDecimal = value;
+        return this;
+      }
+
+      public LineItemTiersBuilder unitAmountInDecimal(String value) {
+        this.unitAmountInDecimal = value;
+        return this;
+      }
+
+      public LineItemTiersParams build() {
+        return new LineItemTiersParams(this);
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final String lineItemId;
+
+    private final EntityType entityType;
+
+    private final String entityId;
+
+    private final String description;
+
+    private final Long amount;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.lineItemId = builder.lineItemId;
+
+      this.entityType = builder.entityType;
+
+      this.entityId = builder.entityId;
+
+      this.description = builder.description;
+
+      this.amount = builder.amount;
+    }
+
+    public String getLineItemId() {
+      return lineItemId;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.lineItemId != null) {
+
+        formData.put("line_item_id", this.lineItemId);
+      }
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private String lineItemId;
+
+      private EntityType entityType;
+
+      private String entityId;
+
+      private String description;
+
+      private Long amount;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder lineItemId(String value) {
+        this.lineItemId = value;
+        return this;
+      }
+
+      public DiscountsBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public DiscountsBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public DiscountsBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum EntityType {
+      ITEM_LEVEL_COUPON("item_level_coupon"),
+
+      DOCUMENT_LEVEL_COUPON("document_level_coupon"),
+
+      PROMOTIONAL_CREDITS("promotional_credits"),
+
+      ITEM_LEVEL_DISCOUNT("item_level_discount"),
+
+      DOCUMENT_LEVEL_DISCOUNT("document_level_discount"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxesParams {
+
+    private final String name;
+
+    private final Number rate;
+
+    private final Long amount;
+
+    private final String description;
+
+    private final JurisType jurisType;
+
+    private final String jurisName;
+
+    private final String jurisCode;
+
+    private TaxesParams(TaxesBuilder builder) {
+
+      this.name = builder.name;
+
+      this.rate = builder.rate;
+
+      this.amount = builder.amount;
+
+      this.description = builder.description;
+
+      this.jurisType = builder.jurisType;
+
+      this.jurisName = builder.jurisName;
+
+      this.jurisCode = builder.jurisCode;
+    }
+
+    public String getName() {
+      return name;
+    }
+
+    public Number getRate() {
+      return rate;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public JurisType getJurisType() {
+      return jurisType;
+    }
+
+    public String getJurisName() {
+      return jurisName;
+    }
+
+    public String getJurisCode() {
+      return jurisCode;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.name != null) {
+
+        formData.put("name", this.name);
+      }
+
+      if (this.rate != null) {
+
+        formData.put("rate", this.rate);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.jurisType != null) {
+
+        formData.put("juris_type", this.jurisType);
+      }
+
+      if (this.jurisName != null) {
+
+        formData.put("juris_name", this.jurisName);
+      }
+
+      if (this.jurisCode != null) {
+
+        formData.put("juris_code", this.jurisCode);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxesBuilder builder() {
+      return new TaxesBuilder();
+    }
+
+    public static final class TaxesBuilder {
+
+      private String name;
+
+      private Number rate;
+
+      private Long amount;
+
+      private String description;
+
+      private JurisType jurisType;
+
+      private String jurisName;
+
+      private String jurisCode;
+
+      private TaxesBuilder() {}
+
+      public TaxesBuilder name(String value) {
+        this.name = value;
+        return this;
+      }
+
+      public TaxesBuilder rate(Number value) {
+        this.rate = value;
+        return this;
+      }
+
+      public TaxesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public TaxesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public TaxesBuilder jurisType(JurisType value) {
+        this.jurisType = value;
+        return this;
+      }
+
+      public TaxesBuilder jurisName(String value) {
+        this.jurisName = value;
+        return this;
+      }
+
+      public TaxesBuilder jurisCode(String value) {
+        this.jurisCode = value;
+        return this;
+      }
+
+      public TaxesParams build() {
+        return new TaxesParams(this);
+      }
+    }
+
+    public enum JurisType {
+      COUNTRY("country"),
+
+      FEDERAL("federal"),
+
+      STATE("state"),
+
+      COUNTY("county"),
+
+      CITY("city"),
+
+      SPECIAL("special"),
+
+      UNINCORPORATED("unincorporated"),
+
+      OTHER("other"),
+
+      /** An enum member indicating that JurisType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      JurisType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static JurisType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (JurisType enumValue : JurisType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentsParams {
+
+    private final String id;
+
+    private final Long amount;
+
+    private final PaymentMethod paymentMethod;
+
+    private final Timestamp date;
+
+    private final String referenceNumber;
+
+    private PaymentsParams(PaymentsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.amount = builder.amount;
+
+      this.paymentMethod = builder.paymentMethod;
+
+      this.date = builder.date;
+
+      this.referenceNumber = builder.referenceNumber;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public PaymentMethod getPaymentMethod() {
+      return paymentMethod;
+    }
+
+    public Timestamp getDate() {
+      return date;
+    }
+
+    public String getReferenceNumber() {
+      return referenceNumber;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.paymentMethod != null) {
+
+        formData.put("payment_method", this.paymentMethod);
+      }
+
+      if (this.date != null) {
+
+        formData.put("date", this.date);
+      }
+
+      if (this.referenceNumber != null) {
+
+        formData.put("reference_number", this.referenceNumber);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentsBuilder builder() {
+      return new PaymentsBuilder();
+    }
+
+    public static final class PaymentsBuilder {
+
+      private String id;
+
+      private Long amount;
+
+      private PaymentMethod paymentMethod;
+
+      private Timestamp date;
+
+      private String referenceNumber;
+
+      private PaymentsBuilder() {}
+
+      public PaymentsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public PaymentsBuilder paymentMethod(PaymentMethod value) {
+        this.paymentMethod = value;
+        return this;
+      }
+
+      public PaymentsBuilder date(Timestamp value) {
+        this.date = value;
+        return this;
+      }
+
+      public PaymentsBuilder referenceNumber(String value) {
+        this.referenceNumber = value;
+        return this;
+      }
+
+      public PaymentsParams build() {
+        return new PaymentsParams(this);
+      }
+    }
+
+    public enum PaymentMethod {
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      OTHER("other"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethod enumValue : PaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class NotesParams {
+
+    private final EntityType entityType;
+
+    private final String entityId;
+
+    private final String note;
+
+    private NotesParams(NotesBuilder builder) {
+
+      this.entityType = builder.entityType;
+
+      this.entityId = builder.entityId;
+
+      this.note = builder.note;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    public String getNote() {
+      return note;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      if (this.note != null) {
+
+        formData.put("note", this.note);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NotesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NotesBuilder builder() {
+      return new NotesBuilder();
+    }
+
+    public static final class NotesBuilder {
+
+      private EntityType entityType;
+
+      private String entityId;
+
+      private String note;
+
+      private NotesBuilder() {}
+
+      public NotesBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public NotesBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public NotesBuilder note(String value) {
+        this.note = value;
+        return this;
+      }
+
+      public NotesParams build() {
+        return new NotesParams(this);
+      }
+    }
+
+    public enum EntityType {
+      COUPON("coupon"),
+
+      PLAN_ITEM_PRICE("plan_item_price"),
+
+      ADDON_ITEM_PRICE("addon_item_price"),
+
+      CHARGE_ITEM_PRICE("charge_item_price"),
+
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class LineItemAddressesParams {
+
+    private final String lineItemId;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private LineItemAddressesParams(LineItemAddressesBuilder builder) {
+
+      this.lineItemId = builder.lineItemId;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getLineItemId() {
+      return lineItemId;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.lineItemId != null) {
+
+        formData.put("line_item_id", this.lineItemId);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LineItemAddressesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LineItemAddressesBuilder builder() {
+      return new LineItemAddressesBuilder();
+    }
+
+    public static final class LineItemAddressesBuilder {
+
+      private String lineItemId;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private LineItemAddressesBuilder() {}
+
+      public LineItemAddressesBuilder lineItemId(String value) {
+        this.lineItemId = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public LineItemAddressesBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public LineItemAddressesParams build() {
+        return new LineItemAddressesParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceAddAddonChargeParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceAddAddonChargeParams.java
new file mode 100644
index 00000000..ad3b512d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceAddAddonChargeParams.java
@@ -0,0 +1,274 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class InvoiceAddAddonChargeParams {
+
+  private final String addonId;
+
+  private final Integer addonQuantity;
+
+  private final Long addonUnitPrice;
+
+  private final String addonQuantityInDecimal;
+
+  private final String addonUnitPriceInDecimal;
+
+  private final String comment;
+
+  private final String subscriptionId;
+
+  private final LineItemParams lineItem;
+
+  private InvoiceAddAddonChargeParams(InvoiceAddAddonChargeBuilder builder) {
+
+    this.addonId = builder.addonId;
+
+    this.addonQuantity = builder.addonQuantity;
+
+    this.addonUnitPrice = builder.addonUnitPrice;
+
+    this.addonQuantityInDecimal = builder.addonQuantityInDecimal;
+
+    this.addonUnitPriceInDecimal = builder.addonUnitPriceInDecimal;
+
+    this.comment = builder.comment;
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.lineItem = builder.lineItem;
+  }
+
+  public String getAddonId() {
+    return addonId;
+  }
+
+  public Integer getAddonQuantity() {
+    return addonQuantity;
+  }
+
+  public Long getAddonUnitPrice() {
+    return addonUnitPrice;
+  }
+
+  public String getAddonQuantityInDecimal() {
+    return addonQuantityInDecimal;
+  }
+
+  public String getAddonUnitPriceInDecimal() {
+    return addonUnitPriceInDecimal;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public LineItemParams getLineItem() {
+    return lineItem;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.addonId != null) {
+
+      formData.put("addon_id", this.addonId);
+    }
+
+    if (this.addonQuantity != null) {
+
+      formData.put("addon_quantity", this.addonQuantity);
+    }
+
+    if (this.addonUnitPrice != null) {
+
+      formData.put("addon_unit_price", this.addonUnitPrice);
+    }
+
+    if (this.addonQuantityInDecimal != null) {
+
+      formData.put("addon_quantity_in_decimal", this.addonQuantityInDecimal);
+    }
+
+    if (this.addonUnitPriceInDecimal != null) {
+
+      formData.put("addon_unit_price_in_decimal", this.addonUnitPriceInDecimal);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.lineItem != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.lineItem.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "line_item[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceAddAddonChargeParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceAddAddonChargeBuilder builder() {
+    return new InvoiceAddAddonChargeBuilder();
+  }
+
+  public static final class InvoiceAddAddonChargeBuilder {
+
+    private String addonId;
+
+    private Integer addonQuantity;
+
+    private Long addonUnitPrice;
+
+    private String addonQuantityInDecimal;
+
+    private String addonUnitPriceInDecimal;
+
+    private String comment;
+
+    private String subscriptionId;
+
+    private LineItemParams lineItem;
+
+    private InvoiceAddAddonChargeBuilder() {}
+
+    public InvoiceAddAddonChargeBuilder addonId(String value) {
+      this.addonId = value;
+      return this;
+    }
+
+    public InvoiceAddAddonChargeBuilder addonQuantity(Integer value) {
+      this.addonQuantity = value;
+      return this;
+    }
+
+    public InvoiceAddAddonChargeBuilder addonUnitPrice(Long value) {
+      this.addonUnitPrice = value;
+      return this;
+    }
+
+    public InvoiceAddAddonChargeBuilder addonQuantityInDecimal(String value) {
+      this.addonQuantityInDecimal = value;
+      return this;
+    }
+
+    public InvoiceAddAddonChargeBuilder addonUnitPriceInDecimal(String value) {
+      this.addonUnitPriceInDecimal = value;
+      return this;
+    }
+
+    public InvoiceAddAddonChargeBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceAddAddonChargeBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public InvoiceAddAddonChargeBuilder lineItem(LineItemParams value) {
+      this.lineItem = value;
+      return this;
+    }
+
+    public InvoiceAddAddonChargeParams build() {
+      return new InvoiceAddAddonChargeParams(this);
+    }
+  }
+
+  public static final class LineItemParams {
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private LineItemParams(LineItemBuilder builder) {
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LineItemParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LineItemBuilder builder() {
+      return new LineItemBuilder();
+    }
+
+    public static final class LineItemBuilder {
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private LineItemBuilder() {}
+
+      public LineItemBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public LineItemBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public LineItemParams build() {
+        return new LineItemParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceAddChargeItemParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceAddChargeItemParams.java
new file mode 100644
index 00000000..52e72ed7
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceAddChargeItemParams.java
@@ -0,0 +1,523 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class InvoiceAddChargeItemParams {
+
+  private final String comment;
+
+  private final String subscriptionId;
+
+  private final ItemPriceParams itemPrice;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private InvoiceAddChargeItemParams(InvoiceAddChargeItemBuilder builder) {
+
+    this.comment = builder.comment;
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.itemPrice = builder.itemPrice;
+
+    this.itemTiers = builder.itemTiers;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public ItemPriceParams getItemPrice() {
+    return itemPrice;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.itemPrice != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemPrice.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_price[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceAddChargeItemParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceAddChargeItemBuilder builder() {
+    return new InvoiceAddChargeItemBuilder();
+  }
+
+  public static final class InvoiceAddChargeItemBuilder {
+
+    private String comment;
+
+    private String subscriptionId;
+
+    private ItemPriceParams itemPrice;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private InvoiceAddChargeItemBuilder() {}
+
+    public InvoiceAddChargeItemBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceAddChargeItemBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public InvoiceAddChargeItemBuilder itemPrice(ItemPriceParams value) {
+      this.itemPrice = value;
+      return this;
+    }
+
+    public InvoiceAddChargeItemBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public InvoiceAddChargeItemParams build() {
+      return new InvoiceAddChargeItemParams(this);
+    }
+  }
+
+  public static final class ItemPriceParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ItemPriceParams(ItemPriceBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemPriceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemPriceBuilder builder() {
+      return new ItemPriceBuilder();
+    }
+
+    public static final class ItemPriceBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ItemPriceBuilder() {}
+
+      public ItemPriceBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemPriceBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public ItemPriceBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public ItemPriceBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public ItemPriceBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public ItemPriceBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ItemPriceBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ItemPriceParams build() {
+        return new ItemPriceParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceAddChargeParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceAddChargeParams.java
new file mode 100644
index 00000000..2900745d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceAddChargeParams.java
@@ -0,0 +1,366 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class InvoiceAddChargeParams {
+
+  private final Long amount;
+
+  private final String description;
+
+  private final AvalaraSaleType avalaraSaleType;
+
+  private final Integer avalaraTransactionType;
+
+  private final Integer avalaraServiceType;
+
+  private final String avalaraTaxCode;
+
+  private final String hsnCode;
+
+  private final String taxjarProductCode;
+
+  private final String comment;
+
+  private final String subscriptionId;
+
+  private final LineItemParams lineItem;
+
+  private InvoiceAddChargeParams(InvoiceAddChargeBuilder builder) {
+
+    this.amount = builder.amount;
+
+    this.description = builder.description;
+
+    this.avalaraSaleType = builder.avalaraSaleType;
+
+    this.avalaraTransactionType = builder.avalaraTransactionType;
+
+    this.avalaraServiceType = builder.avalaraServiceType;
+
+    this.avalaraTaxCode = builder.avalaraTaxCode;
+
+    this.hsnCode = builder.hsnCode;
+
+    this.taxjarProductCode = builder.taxjarProductCode;
+
+    this.comment = builder.comment;
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.lineItem = builder.lineItem;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public AvalaraSaleType getAvalaraSaleType() {
+    return avalaraSaleType;
+  }
+
+  public Integer getAvalaraTransactionType() {
+    return avalaraTransactionType;
+  }
+
+  public Integer getAvalaraServiceType() {
+    return avalaraServiceType;
+  }
+
+  public String getAvalaraTaxCode() {
+    return avalaraTaxCode;
+  }
+
+  public String getHsnCode() {
+    return hsnCode;
+  }
+
+  public String getTaxjarProductCode() {
+    return taxjarProductCode;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public LineItemParams getLineItem() {
+    return lineItem;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.avalaraSaleType != null) {
+
+      formData.put("avalara_sale_type", this.avalaraSaleType);
+    }
+
+    if (this.avalaraTransactionType != null) {
+
+      formData.put("avalara_transaction_type", this.avalaraTransactionType);
+    }
+
+    if (this.avalaraServiceType != null) {
+
+      formData.put("avalara_service_type", this.avalaraServiceType);
+    }
+
+    if (this.avalaraTaxCode != null) {
+
+      formData.put("avalara_tax_code", this.avalaraTaxCode);
+    }
+
+    if (this.hsnCode != null) {
+
+      formData.put("hsn_code", this.hsnCode);
+    }
+
+    if (this.taxjarProductCode != null) {
+
+      formData.put("taxjar_product_code", this.taxjarProductCode);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.lineItem != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.lineItem.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "line_item[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceAddChargeParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceAddChargeBuilder builder() {
+    return new InvoiceAddChargeBuilder();
+  }
+
+  public static final class InvoiceAddChargeBuilder {
+
+    private Long amount;
+
+    private String description;
+
+    private AvalaraSaleType avalaraSaleType;
+
+    private Integer avalaraTransactionType;
+
+    private Integer avalaraServiceType;
+
+    private String avalaraTaxCode;
+
+    private String hsnCode;
+
+    private String taxjarProductCode;
+
+    private String comment;
+
+    private String subscriptionId;
+
+    private LineItemParams lineItem;
+
+    private InvoiceAddChargeBuilder() {}
+
+    public InvoiceAddChargeBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public InvoiceAddChargeBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public InvoiceAddChargeBuilder avalaraSaleType(AvalaraSaleType value) {
+      this.avalaraSaleType = value;
+      return this;
+    }
+
+    public InvoiceAddChargeBuilder avalaraTransactionType(Integer value) {
+      this.avalaraTransactionType = value;
+      return this;
+    }
+
+    public InvoiceAddChargeBuilder avalaraServiceType(Integer value) {
+      this.avalaraServiceType = value;
+      return this;
+    }
+
+    public InvoiceAddChargeBuilder avalaraTaxCode(String value) {
+      this.avalaraTaxCode = value;
+      return this;
+    }
+
+    public InvoiceAddChargeBuilder hsnCode(String value) {
+      this.hsnCode = value;
+      return this;
+    }
+
+    public InvoiceAddChargeBuilder taxjarProductCode(String value) {
+      this.taxjarProductCode = value;
+      return this;
+    }
+
+    public InvoiceAddChargeBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceAddChargeBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public InvoiceAddChargeBuilder lineItem(LineItemParams value) {
+      this.lineItem = value;
+      return this;
+    }
+
+    public InvoiceAddChargeParams build() {
+      return new InvoiceAddChargeParams(this);
+    }
+  }
+
+  public enum AvalaraSaleType {
+    WHOLESALE("wholesale"),
+
+    RETAIL("retail"),
+
+    CONSUMED("consumed"),
+
+    VENDOR_USE("vendor_use"),
+
+    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AvalaraSaleType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AvalaraSaleType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class LineItemParams {
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private LineItemParams(LineItemBuilder builder) {
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LineItemParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LineItemBuilder builder() {
+      return new LineItemBuilder();
+    }
+
+    public static final class LineItemBuilder {
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private LineItemBuilder() {}
+
+      public LineItemBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public LineItemBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public LineItemParams build() {
+        return new LineItemParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceApplyCreditsParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceApplyCreditsParams.java
new file mode 100644
index 00000000..61143c0b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceApplyCreditsParams.java
@@ -0,0 +1,139 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class InvoiceApplyCreditsParams {
+
+  private final String comment;
+
+  private final List<CreditNotesParams> creditNotes;
+
+  private InvoiceApplyCreditsParams(InvoiceApplyCreditsBuilder builder) {
+
+    this.comment = builder.comment;
+
+    this.creditNotes = builder.creditNotes;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public List<CreditNotesParams> getCreditNotes() {
+    return creditNotes;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.creditNotes != null) {
+
+      // List of objects
+      for (int i = 0; i < this.creditNotes.size(); i++) {
+        CreditNotesParams item = this.creditNotes.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "credit_notes[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceApplyCreditsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceApplyCreditsBuilder builder() {
+    return new InvoiceApplyCreditsBuilder();
+  }
+
+  public static final class InvoiceApplyCreditsBuilder {
+
+    private String comment;
+
+    private List<CreditNotesParams> creditNotes;
+
+    private InvoiceApplyCreditsBuilder() {}
+
+    public InvoiceApplyCreditsBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceApplyCreditsBuilder creditNotes(List<CreditNotesParams> value) {
+      this.creditNotes = value;
+      return this;
+    }
+
+    public InvoiceApplyCreditsParams build() {
+      return new InvoiceApplyCreditsParams(this);
+    }
+  }
+
+  public static final class CreditNotesParams {
+
+    private final String id;
+
+    private CreditNotesParams(CreditNotesBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreditNotesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreditNotesBuilder builder() {
+      return new CreditNotesBuilder();
+    }
+
+    public static final class CreditNotesBuilder {
+
+      private String id;
+
+      private CreditNotesBuilder() {}
+
+      public CreditNotesBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CreditNotesParams build() {
+        return new CreditNotesParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceApplyPaymentScheduleSchemeParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceApplyPaymentScheduleSchemeParams.java
new file mode 100644
index 00000000..9b4560bb
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceApplyPaymentScheduleSchemeParams.java
@@ -0,0 +1,81 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InvoiceApplyPaymentScheduleSchemeParams {
+
+  private final String schemeId;
+
+  private final Long amount;
+
+  private InvoiceApplyPaymentScheduleSchemeParams(
+      InvoiceApplyPaymentScheduleSchemeBuilder builder) {
+
+    this.schemeId = builder.schemeId;
+
+    this.amount = builder.amount;
+  }
+
+  public String getSchemeId() {
+    return schemeId;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.schemeId != null) {
+
+      formData.put("scheme_id", this.schemeId);
+    }
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceApplyPaymentScheduleSchemeParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceApplyPaymentScheduleSchemeBuilder builder() {
+    return new InvoiceApplyPaymentScheduleSchemeBuilder();
+  }
+
+  public static final class InvoiceApplyPaymentScheduleSchemeBuilder {
+
+    private String schemeId;
+
+    private Long amount;
+
+    private InvoiceApplyPaymentScheduleSchemeBuilder() {}
+
+    public InvoiceApplyPaymentScheduleSchemeBuilder schemeId(String value) {
+      this.schemeId = value;
+      return this;
+    }
+
+    public InvoiceApplyPaymentScheduleSchemeBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public InvoiceApplyPaymentScheduleSchemeParams build() {
+      return new InvoiceApplyPaymentScheduleSchemeParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceApplyPaymentsParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceApplyPaymentsParams.java
new file mode 100644
index 00000000..7d14fe11
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceApplyPaymentsParams.java
@@ -0,0 +1,159 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class InvoiceApplyPaymentsParams {
+
+  private final String comment;
+
+  private final List<TransactionsParams> transactions;
+
+  private InvoiceApplyPaymentsParams(InvoiceApplyPaymentsBuilder builder) {
+
+    this.comment = builder.comment;
+
+    this.transactions = builder.transactions;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public List<TransactionsParams> getTransactions() {
+    return transactions;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.transactions != null) {
+
+      // List of objects
+      for (int i = 0; i < this.transactions.size(); i++) {
+        TransactionsParams item = this.transactions.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "transactions[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceApplyPaymentsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceApplyPaymentsBuilder builder() {
+    return new InvoiceApplyPaymentsBuilder();
+  }
+
+  public static final class InvoiceApplyPaymentsBuilder {
+
+    private String comment;
+
+    private List<TransactionsParams> transactions;
+
+    private InvoiceApplyPaymentsBuilder() {}
+
+    public InvoiceApplyPaymentsBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceApplyPaymentsBuilder transactions(List<TransactionsParams> value) {
+      this.transactions = value;
+      return this;
+    }
+
+    public InvoiceApplyPaymentsParams build() {
+      return new InvoiceApplyPaymentsParams(this);
+    }
+  }
+
+  public static final class TransactionsParams {
+
+    private final String id;
+
+    private final Long amount;
+
+    private TransactionsParams(TransactionsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.amount = builder.amount;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TransactionsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TransactionsBuilder builder() {
+      return new TransactionsBuilder();
+    }
+
+    public static final class TransactionsBuilder {
+
+      private String id;
+
+      private Long amount;
+
+      private TransactionsBuilder() {}
+
+      public TransactionsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public TransactionsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public TransactionsParams build() {
+        return new TransactionsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceChargeAddonParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceChargeAddonParams.java
new file mode 100644
index 00000000..1b4cb346
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceChargeAddonParams.java
@@ -0,0 +1,371 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class InvoiceChargeAddonParams {
+
+  private final String customerId;
+
+  private final String subscriptionId;
+
+  private final String addonId;
+
+  private final Integer addonQuantity;
+
+  private final Long addonUnitPrice;
+
+  private final String addonQuantityInDecimal;
+
+  private final String addonUnitPriceInDecimal;
+
+  private final Timestamp dateFrom;
+
+  private final Timestamp dateTo;
+
+  private final List<String> couponIds;
+
+  private final String coupon;
+
+  private final String poNumber;
+
+  private final Timestamp invoiceDate;
+
+  private final String paymentSourceId;
+
+  private final PaymentInitiator paymentInitiator;
+
+  private InvoiceChargeAddonParams(InvoiceChargeAddonBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.addonId = builder.addonId;
+
+    this.addonQuantity = builder.addonQuantity;
+
+    this.addonUnitPrice = builder.addonUnitPrice;
+
+    this.addonQuantityInDecimal = builder.addonQuantityInDecimal;
+
+    this.addonUnitPriceInDecimal = builder.addonUnitPriceInDecimal;
+
+    this.dateFrom = builder.dateFrom;
+
+    this.dateTo = builder.dateTo;
+
+    this.couponIds = builder.couponIds;
+
+    this.coupon = builder.coupon;
+
+    this.poNumber = builder.poNumber;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.paymentInitiator = builder.paymentInitiator;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getAddonId() {
+    return addonId;
+  }
+
+  public Integer getAddonQuantity() {
+    return addonQuantity;
+  }
+
+  public Long getAddonUnitPrice() {
+    return addonUnitPrice;
+  }
+
+  public String getAddonQuantityInDecimal() {
+    return addonQuantityInDecimal;
+  }
+
+  public String getAddonUnitPriceInDecimal() {
+    return addonUnitPriceInDecimal;
+  }
+
+  public Timestamp getDateFrom() {
+    return dateFrom;
+  }
+
+  public Timestamp getDateTo() {
+    return dateTo;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public PaymentInitiator getPaymentInitiator() {
+    return paymentInitiator;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.addonId != null) {
+
+      formData.put("addon_id", this.addonId);
+    }
+
+    if (this.addonQuantity != null) {
+
+      formData.put("addon_quantity", this.addonQuantity);
+    }
+
+    if (this.addonUnitPrice != null) {
+
+      formData.put("addon_unit_price", this.addonUnitPrice);
+    }
+
+    if (this.addonQuantityInDecimal != null) {
+
+      formData.put("addon_quantity_in_decimal", this.addonQuantityInDecimal);
+    }
+
+    if (this.addonUnitPriceInDecimal != null) {
+
+      formData.put("addon_unit_price_in_decimal", this.addonUnitPriceInDecimal);
+    }
+
+    if (this.dateFrom != null) {
+
+      formData.put("date_from", this.dateFrom);
+    }
+
+    if (this.dateTo != null) {
+
+      formData.put("date_to", this.dateTo);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.paymentInitiator != null) {
+
+      formData.put("payment_initiator", this.paymentInitiator);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceChargeAddonParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceChargeAddonBuilder builder() {
+    return new InvoiceChargeAddonBuilder();
+  }
+
+  public static final class InvoiceChargeAddonBuilder {
+
+    private String customerId;
+
+    private String subscriptionId;
+
+    private String addonId;
+
+    private Integer addonQuantity;
+
+    private Long addonUnitPrice;
+
+    private String addonQuantityInDecimal;
+
+    private String addonUnitPriceInDecimal;
+
+    private Timestamp dateFrom;
+
+    private Timestamp dateTo;
+
+    private List<String> couponIds;
+
+    private String coupon;
+
+    private String poNumber;
+
+    private Timestamp invoiceDate;
+
+    private String paymentSourceId;
+
+    private PaymentInitiator paymentInitiator;
+
+    private InvoiceChargeAddonBuilder() {}
+
+    public InvoiceChargeAddonBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonBuilder addonId(String value) {
+      this.addonId = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonBuilder addonQuantity(Integer value) {
+      this.addonQuantity = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonBuilder addonUnitPrice(Long value) {
+      this.addonUnitPrice = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonBuilder addonQuantityInDecimal(String value) {
+      this.addonQuantityInDecimal = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonBuilder addonUnitPriceInDecimal(String value) {
+      this.addonUnitPriceInDecimal = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonBuilder dateFrom(Timestamp value) {
+      this.dateFrom = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonBuilder dateTo(Timestamp value) {
+      this.dateTo = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    @Deprecated
+    public InvoiceChargeAddonBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonBuilder paymentInitiator(PaymentInitiator value) {
+      this.paymentInitiator = value;
+      return this;
+    }
+
+    public InvoiceChargeAddonParams build() {
+      return new InvoiceChargeAddonParams(this);
+    }
+  }
+
+  public enum PaymentInitiator {
+    CUSTOMER("customer"),
+
+    MERCHANT("merchant"),
+
+    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentInitiator(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentInitiator fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceChargeParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceChargeParams.java
new file mode 100644
index 00000000..6bada6c7
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceChargeParams.java
@@ -0,0 +1,561 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class InvoiceChargeParams {
+
+  private final String customerId;
+
+  private final String subscriptionId;
+
+  private final String currencyCode;
+
+  private final Long amount;
+
+  private final String amountInDecimal;
+
+  private final String description;
+
+  private final Timestamp dateFrom;
+
+  private final Timestamp dateTo;
+
+  private final List<String> couponIds;
+
+  private final String coupon;
+
+  private final AvalaraSaleType avalaraSaleType;
+
+  private final Integer avalaraTransactionType;
+
+  private final Integer avalaraServiceType;
+
+  private final String poNumber;
+
+  private final Timestamp invoiceDate;
+
+  private final String paymentSourceId;
+
+  private final PaymentInitiator paymentInitiator;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private InvoiceChargeParams(InvoiceChargeBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.amount = builder.amount;
+
+    this.amountInDecimal = builder.amountInDecimal;
+
+    this.description = builder.description;
+
+    this.dateFrom = builder.dateFrom;
+
+    this.dateTo = builder.dateTo;
+
+    this.couponIds = builder.couponIds;
+
+    this.coupon = builder.coupon;
+
+    this.avalaraSaleType = builder.avalaraSaleType;
+
+    this.avalaraTransactionType = builder.avalaraTransactionType;
+
+    this.avalaraServiceType = builder.avalaraServiceType;
+
+    this.poNumber = builder.poNumber;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.paymentInitiator = builder.paymentInitiator;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getAmountInDecimal() {
+    return amountInDecimal;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public Timestamp getDateFrom() {
+    return dateFrom;
+  }
+
+  public Timestamp getDateTo() {
+    return dateTo;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public AvalaraSaleType getAvalaraSaleType() {
+    return avalaraSaleType;
+  }
+
+  public Integer getAvalaraTransactionType() {
+    return avalaraTransactionType;
+  }
+
+  public Integer getAvalaraServiceType() {
+    return avalaraServiceType;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public PaymentInitiator getPaymentInitiator() {
+    return paymentInitiator;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.amountInDecimal != null) {
+
+      formData.put("amount_in_decimal", this.amountInDecimal);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.dateFrom != null) {
+
+      formData.put("date_from", this.dateFrom);
+    }
+
+    if (this.dateTo != null) {
+
+      formData.put("date_to", this.dateTo);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.avalaraSaleType != null) {
+
+      formData.put("avalara_sale_type", this.avalaraSaleType);
+    }
+
+    if (this.avalaraTransactionType != null) {
+
+      formData.put("avalara_transaction_type", this.avalaraTransactionType);
+    }
+
+    if (this.avalaraServiceType != null) {
+
+      formData.put("avalara_service_type", this.avalaraServiceType);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.paymentInitiator != null) {
+
+      formData.put("payment_initiator", this.paymentInitiator);
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceChargeParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceChargeBuilder builder() {
+    return new InvoiceChargeBuilder();
+  }
+
+  public static final class InvoiceChargeBuilder {
+
+    private String customerId;
+
+    private String subscriptionId;
+
+    private String currencyCode;
+
+    private Long amount;
+
+    private String amountInDecimal;
+
+    private String description;
+
+    private Timestamp dateFrom;
+
+    private Timestamp dateTo;
+
+    private List<String> couponIds;
+
+    private String coupon;
+
+    private AvalaraSaleType avalaraSaleType;
+
+    private Integer avalaraTransactionType;
+
+    private Integer avalaraServiceType;
+
+    private String poNumber;
+
+    private Timestamp invoiceDate;
+
+    private String paymentSourceId;
+
+    private PaymentInitiator paymentInitiator;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private InvoiceChargeBuilder() {}
+
+    public InvoiceChargeBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder amountInDecimal(String value) {
+      this.amountInDecimal = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder dateFrom(Timestamp value) {
+      this.dateFrom = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder dateTo(Timestamp value) {
+      this.dateTo = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    @Deprecated
+    public InvoiceChargeBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder avalaraSaleType(AvalaraSaleType value) {
+      this.avalaraSaleType = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder avalaraTransactionType(Integer value) {
+      this.avalaraTransactionType = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder avalaraServiceType(Integer value) {
+      this.avalaraServiceType = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder paymentInitiator(PaymentInitiator value) {
+      this.paymentInitiator = value;
+      return this;
+    }
+
+    public InvoiceChargeBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public InvoiceChargeParams build() {
+      return new InvoiceChargeParams(this);
+    }
+  }
+
+  public enum AvalaraSaleType {
+    WHOLESALE("wholesale"),
+
+    RETAIL("retail"),
+
+    CONSUMED("consumed"),
+
+    VENDOR_USE("vendor_use"),
+
+    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AvalaraSaleType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AvalaraSaleType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PaymentInitiator {
+    CUSTOMER("customer"),
+
+    MERCHANT("merchant"),
+
+    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentInitiator(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentInitiator fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCloseParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCloseParams.java
new file mode 100644
index 00000000..b6daae6c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCloseParams.java
@@ -0,0 +1,312 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class InvoiceCloseParams {
+
+  private final String comment;
+
+  private final String invoiceNote;
+
+  private final Boolean removeGeneralNote;
+
+  private final Timestamp invoiceDate;
+
+  private final List<NotesToRemoveParams> notesToRemove;
+
+  private final Map<String, String> customFields;
+
+  private InvoiceCloseParams(InvoiceCloseBuilder builder) {
+
+    this.comment = builder.comment;
+
+    this.invoiceNote = builder.invoiceNote;
+
+    this.removeGeneralNote = builder.removeGeneralNote;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.notesToRemove = builder.notesToRemove;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public String getInvoiceNote() {
+    return invoiceNote;
+  }
+
+  public Boolean getRemoveGeneralNote() {
+    return removeGeneralNote;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public List<NotesToRemoveParams> getNotesToRemove() {
+    return notesToRemove;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.invoiceNote != null) {
+
+      formData.put("invoice_note", this.invoiceNote);
+    }
+
+    if (this.removeGeneralNote != null) {
+
+      formData.put("remove_general_note", this.removeGeneralNote);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.notesToRemove != null) {
+
+      // List of objects
+      for (int i = 0; i < this.notesToRemove.size(); i++) {
+        NotesToRemoveParams item = this.notesToRemove.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "notes_to_remove[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceCloseParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceCloseBuilder builder() {
+    return new InvoiceCloseBuilder();
+  }
+
+  public static final class InvoiceCloseBuilder {
+
+    private String comment;
+
+    private String invoiceNote;
+
+    private Boolean removeGeneralNote;
+
+    private Timestamp invoiceDate;
+
+    private List<NotesToRemoveParams> notesToRemove;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private InvoiceCloseBuilder() {}
+
+    public InvoiceCloseBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceCloseBuilder invoiceNote(String value) {
+      this.invoiceNote = value;
+      return this;
+    }
+
+    public InvoiceCloseBuilder removeGeneralNote(Boolean value) {
+      this.removeGeneralNote = value;
+      return this;
+    }
+
+    public InvoiceCloseBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public InvoiceCloseBuilder notesToRemove(List<NotesToRemoveParams> value) {
+      this.notesToRemove = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public InvoiceCloseBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public InvoiceCloseBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public InvoiceCloseParams build() {
+      return new InvoiceCloseParams(this);
+    }
+  }
+
+  public static final class NotesToRemoveParams {
+
+    private final EntityType entityType;
+
+    private final String entityId;
+
+    private NotesToRemoveParams(NotesToRemoveBuilder builder) {
+
+      this.entityType = builder.entityType;
+
+      this.entityId = builder.entityId;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NotesToRemoveParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NotesToRemoveBuilder builder() {
+      return new NotesToRemoveBuilder();
+    }
+
+    public static final class NotesToRemoveBuilder {
+
+      private EntityType entityType;
+
+      private String entityId;
+
+      private NotesToRemoveBuilder() {}
+
+      public NotesToRemoveBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public NotesToRemoveBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public NotesToRemoveParams build() {
+        return new NotesToRemoveParams(this);
+      }
+    }
+
+    public enum EntityType {
+      CUSTOMER("customer"),
+
+      SUBSCRIPTION("subscription"),
+
+      COUPON("coupon"),
+
+      PLAN_ITEM_PRICE("plan_item_price"),
+
+      ADDON_ITEM_PRICE("addon_item_price"),
+
+      CHARGE_ITEM_PRICE("charge_item_price"),
+
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCollectPaymentParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCollectPaymentParams.java
new file mode 100644
index 00000000..5857c98f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCollectPaymentParams.java
@@ -0,0 +1,168 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InvoiceCollectPaymentParams {
+
+  private final Long amount;
+
+  private final String authorizationTransactionId;
+
+  private final String paymentSourceId;
+
+  private final String comment;
+
+  private final PaymentInitiator paymentInitiator;
+
+  private InvoiceCollectPaymentParams(InvoiceCollectPaymentBuilder builder) {
+
+    this.amount = builder.amount;
+
+    this.authorizationTransactionId = builder.authorizationTransactionId;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.comment = builder.comment;
+
+    this.paymentInitiator = builder.paymentInitiator;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getAuthorizationTransactionId() {
+    return authorizationTransactionId;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public PaymentInitiator getPaymentInitiator() {
+    return paymentInitiator;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.authorizationTransactionId != null) {
+
+      formData.put("authorization_transaction_id", this.authorizationTransactionId);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.paymentInitiator != null) {
+
+      formData.put("payment_initiator", this.paymentInitiator);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceCollectPaymentParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceCollectPaymentBuilder builder() {
+    return new InvoiceCollectPaymentBuilder();
+  }
+
+  public static final class InvoiceCollectPaymentBuilder {
+
+    private Long amount;
+
+    private String authorizationTransactionId;
+
+    private String paymentSourceId;
+
+    private String comment;
+
+    private PaymentInitiator paymentInitiator;
+
+    private InvoiceCollectPaymentBuilder() {}
+
+    public InvoiceCollectPaymentBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public InvoiceCollectPaymentBuilder authorizationTransactionId(String value) {
+      this.authorizationTransactionId = value;
+      return this;
+    }
+
+    public InvoiceCollectPaymentBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public InvoiceCollectPaymentBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceCollectPaymentBuilder paymentInitiator(PaymentInitiator value) {
+      this.paymentInitiator = value;
+      return this;
+    }
+
+    public InvoiceCollectPaymentParams build() {
+      return new InvoiceCollectPaymentParams(this);
+    }
+  }
+
+  public enum PaymentInitiator {
+    CUSTOMER("customer"),
+
+    MERCHANT("merchant"),
+
+    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentInitiator(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentInitiator fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCreateForChargeItemParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCreateForChargeItemParams.java
new file mode 100644
index 00000000..860d8ed8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCreateForChargeItemParams.java
@@ -0,0 +1,651 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class InvoiceCreateForChargeItemParams {
+
+  private final String customerId;
+
+  private final String subscriptionId;
+
+  private final String poNumber;
+
+  private final String coupon;
+
+  private final String paymentSourceId;
+
+  private final PaymentInitiator paymentInitiator;
+
+  private final Timestamp invoiceDate;
+
+  private final ItemPriceParams itemPrice;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private InvoiceCreateForChargeItemParams(InvoiceCreateForChargeItemBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.poNumber = builder.poNumber;
+
+    this.coupon = builder.coupon;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.paymentInitiator = builder.paymentInitiator;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.itemPrice = builder.itemPrice;
+
+    this.itemTiers = builder.itemTiers;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public PaymentInitiator getPaymentInitiator() {
+    return paymentInitiator;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public ItemPriceParams getItemPrice() {
+    return itemPrice;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.paymentInitiator != null) {
+
+      formData.put("payment_initiator", this.paymentInitiator);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.itemPrice != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.itemPrice.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "item_price[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceCreateForChargeItemParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceCreateForChargeItemBuilder builder() {
+    return new InvoiceCreateForChargeItemBuilder();
+  }
+
+  public static final class InvoiceCreateForChargeItemBuilder {
+
+    private String customerId;
+
+    private String subscriptionId;
+
+    private String poNumber;
+
+    private String coupon;
+
+    private String paymentSourceId;
+
+    private PaymentInitiator paymentInitiator;
+
+    private Timestamp invoiceDate;
+
+    private ItemPriceParams itemPrice;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private InvoiceCreateForChargeItemBuilder() {}
+
+    public InvoiceCreateForChargeItemBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemBuilder paymentInitiator(PaymentInitiator value) {
+      this.paymentInitiator = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemBuilder itemPrice(ItemPriceParams value) {
+      this.itemPrice = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemParams build() {
+      return new InvoiceCreateForChargeItemParams(this);
+    }
+  }
+
+  public enum PaymentInitiator {
+    CUSTOMER("customer"),
+
+    MERCHANT("merchant"),
+
+    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentInitiator(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentInitiator fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ItemPriceParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ItemPriceParams(ItemPriceBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemPriceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemPriceBuilder builder() {
+      return new ItemPriceBuilder();
+    }
+
+    public static final class ItemPriceBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ItemPriceBuilder() {}
+
+      public ItemPriceBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemPriceBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public ItemPriceBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public ItemPriceBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public ItemPriceBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public ItemPriceBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ItemPriceBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ItemPriceParams build() {
+        return new ItemPriceParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCreateForChargeItemsAndChargesParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCreateForChargeItemsAndChargesParams.java
new file mode 100644
index 00000000..90224c27
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCreateForChargeItemsAndChargesParams.java
@@ -0,0 +1,3940 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class InvoiceCreateForChargeItemsAndChargesParams {
+
+  private final String customerId;
+
+  private final String subscriptionId;
+
+  private final String currencyCode;
+
+  private final String invoiceNote;
+
+  private final Boolean removeGeneralNote;
+
+  private final String poNumber;
+
+  private final String coupon;
+
+  private final List<String> couponIds;
+
+  private final String authorizationTransactionId;
+
+  private final String paymentSourceId;
+
+  private final AutoCollection autoCollection;
+
+  private final Timestamp invoiceDate;
+
+  private final String tokenId;
+
+  private final Boolean replacePrimaryPaymentSource;
+
+  private final Boolean retainPaymentSource;
+
+  private final PaymentInitiator paymentInitiator;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final StatementDescriptorParams statementDescriptor;
+
+  private final CardParams card;
+
+  private final BankAccountParams bankAccount;
+
+  private final PaymentMethodParams paymentMethod;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final List<ItemPricesParams> itemPrices;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<ChargesParams> charges;
+
+  private final List<NotesToRemoveParams> notesToRemove;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private final List<DiscountsParams> discounts;
+
+  private final Map<String, String> customFields;
+
+  private InvoiceCreateForChargeItemsAndChargesParams(
+      InvoiceCreateForChargeItemsAndChargesBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.invoiceNote = builder.invoiceNote;
+
+    this.removeGeneralNote = builder.removeGeneralNote;
+
+    this.poNumber = builder.poNumber;
+
+    this.coupon = builder.coupon;
+
+    this.couponIds = builder.couponIds;
+
+    this.authorizationTransactionId = builder.authorizationTransactionId;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.tokenId = builder.tokenId;
+
+    this.replacePrimaryPaymentSource = builder.replacePrimaryPaymentSource;
+
+    this.retainPaymentSource = builder.retainPaymentSource;
+
+    this.paymentInitiator = builder.paymentInitiator;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.statementDescriptor = builder.statementDescriptor;
+
+    this.card = builder.card;
+
+    this.bankAccount = builder.bankAccount;
+
+    this.paymentMethod = builder.paymentMethod;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.itemPrices = builder.itemPrices;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.charges = builder.charges;
+
+    this.notesToRemove = builder.notesToRemove;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+
+    this.discounts = builder.discounts;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getInvoiceNote() {
+    return invoiceNote;
+  }
+
+  public Boolean getRemoveGeneralNote() {
+    return removeGeneralNote;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getAuthorizationTransactionId() {
+    return authorizationTransactionId;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public String getTokenId() {
+    return tokenId;
+  }
+
+  public Boolean getReplacePrimaryPaymentSource() {
+    return replacePrimaryPaymentSource;
+  }
+
+  public Boolean getRetainPaymentSource() {
+    return retainPaymentSource;
+  }
+
+  public PaymentInitiator getPaymentInitiator() {
+    return paymentInitiator;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public StatementDescriptorParams getStatementDescriptor() {
+    return statementDescriptor;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public BankAccountParams getBankAccount() {
+    return bankAccount;
+  }
+
+  public PaymentMethodParams getPaymentMethod() {
+    return paymentMethod;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public List<ItemPricesParams> getItemPrices() {
+    return itemPrices;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<ChargesParams> getCharges() {
+    return charges;
+  }
+
+  public List<NotesToRemoveParams> getNotesToRemove() {
+    return notesToRemove;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.invoiceNote != null) {
+
+      formData.put("invoice_note", this.invoiceNote);
+    }
+
+    if (this.removeGeneralNote != null) {
+
+      formData.put("remove_general_note", this.removeGeneralNote);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.authorizationTransactionId != null) {
+
+      formData.put("authorization_transaction_id", this.authorizationTransactionId);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.tokenId != null) {
+
+      formData.put("token_id", this.tokenId);
+    }
+
+    if (this.replacePrimaryPaymentSource != null) {
+
+      formData.put("replace_primary_payment_source", this.replacePrimaryPaymentSource);
+    }
+
+    if (this.retainPaymentSource != null) {
+
+      formData.put("retain_payment_source", this.retainPaymentSource);
+    }
+
+    if (this.paymentInitiator != null) {
+
+      formData.put("payment_initiator", this.paymentInitiator);
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.statementDescriptor != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.statementDescriptor.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.bankAccount != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.bankAccount.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "bank_account[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentMethod != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentMethod.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_method[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemPrices != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemPrices.size(); i++) {
+        ItemPricesParams item = this.itemPrices.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_prices[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.charges != null) {
+
+      // List of objects
+      for (int i = 0; i < this.charges.size(); i++) {
+        ChargesParams item = this.charges.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.notesToRemove != null) {
+
+      // List of objects
+      for (int i = 0; i < this.notesToRemove.size(); i++) {
+        NotesToRemoveParams item = this.notesToRemove.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "notes_to_remove[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceCreateForChargeItemsAndChargesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceCreateForChargeItemsAndChargesBuilder builder() {
+    return new InvoiceCreateForChargeItemsAndChargesBuilder();
+  }
+
+  public static final class InvoiceCreateForChargeItemsAndChargesBuilder {
+
+    private String customerId;
+
+    private String subscriptionId;
+
+    private String currencyCode;
+
+    private String invoiceNote;
+
+    private Boolean removeGeneralNote;
+
+    private String poNumber;
+
+    private String coupon;
+
+    private List<String> couponIds;
+
+    private String authorizationTransactionId;
+
+    private String paymentSourceId;
+
+    private AutoCollection autoCollection;
+
+    private Timestamp invoiceDate;
+
+    private String tokenId;
+
+    private Boolean replacePrimaryPaymentSource;
+
+    private Boolean retainPaymentSource;
+
+    private PaymentInitiator paymentInitiator;
+
+    private ShippingAddressParams shippingAddress;
+
+    private StatementDescriptorParams statementDescriptor;
+
+    private CardParams card;
+
+    private BankAccountParams bankAccount;
+
+    private PaymentMethodParams paymentMethod;
+
+    private PaymentIntentParams paymentIntent;
+
+    private List<ItemPricesParams> itemPrices;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<ChargesParams> charges;
+
+    private List<NotesToRemoveParams> notesToRemove;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private List<DiscountsParams> discounts;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private InvoiceCreateForChargeItemsAndChargesBuilder() {}
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder invoiceNote(String value) {
+      this.invoiceNote = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder removeGeneralNote(Boolean value) {
+      this.removeGeneralNote = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    @Deprecated
+    public InvoiceCreateForChargeItemsAndChargesBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder authorizationTransactionId(String value) {
+      this.authorizationTransactionId = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder tokenId(String value) {
+      this.tokenId = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder replacePrimaryPaymentSource(Boolean value) {
+      this.replacePrimaryPaymentSource = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder retainPaymentSource(Boolean value) {
+      this.retainPaymentSource = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder paymentInitiator(PaymentInitiator value) {
+      this.paymentInitiator = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder shippingAddress(
+        ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder statementDescriptor(
+        StatementDescriptorParams value) {
+      this.statementDescriptor = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder bankAccount(BankAccountParams value) {
+      this.bankAccount = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder paymentMethod(PaymentMethodParams value) {
+      this.paymentMethod = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder itemPrices(List<ItemPricesParams> value) {
+      this.itemPrices = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder charges(List<ChargesParams> value) {
+      this.charges = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder notesToRemove(
+        List<NotesToRemoveParams> value) {
+      this.notesToRemove = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder taxProvidersFields(
+        List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public InvoiceCreateForChargeItemsAndChargesBuilder customField(
+        String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public InvoiceCreateForChargeItemsAndChargesBuilder customFields(
+        Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public InvoiceCreateForChargeItemsAndChargesParams build() {
+      return new InvoiceCreateForChargeItemsAndChargesParams(this);
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PaymentInitiator {
+    CUSTOMER("customer"),
+
+    MERCHANT("merchant"),
+
+    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentInitiator(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentInitiator fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatementDescriptorParams {
+
+    private final String descriptor;
+
+    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
+
+      this.descriptor = builder.descriptor;
+    }
+
+    public String getDescriptor() {
+      return descriptor;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.descriptor != null) {
+
+        formData.put("descriptor", this.descriptor);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatementDescriptorParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatementDescriptorBuilder builder() {
+      return new StatementDescriptorBuilder();
+    }
+
+    public static final class StatementDescriptorBuilder {
+
+      private String descriptor;
+
+      private StatementDescriptorBuilder() {}
+
+      public StatementDescriptorBuilder descriptor(String value) {
+        this.descriptor = value;
+        return this;
+      }
+
+      public StatementDescriptorParams build() {
+        return new StatementDescriptorParams(this);
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String tmpToken;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String number;
+
+    private final Integer expiryMonth;
+
+    private final Integer expiryYear;
+
+    private final String cvv;
+
+    private final PreferredScheme preferredScheme;
+
+    private final String billingAddr1;
+
+    private final String billingAddr2;
+
+    private final String billingCity;
+
+    private final String billingStateCode;
+
+    private final String billingState;
+
+    private final String billingZip;
+
+    private final String billingCountry;
+
+    private final String ipAddress;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.number = builder.number;
+
+      this.expiryMonth = builder.expiryMonth;
+
+      this.expiryYear = builder.expiryYear;
+
+      this.cvv = builder.cvv;
+
+      this.preferredScheme = builder.preferredScheme;
+
+      this.billingAddr1 = builder.billingAddr1;
+
+      this.billingAddr2 = builder.billingAddr2;
+
+      this.billingCity = builder.billingCity;
+
+      this.billingStateCode = builder.billingStateCode;
+
+      this.billingState = builder.billingState;
+
+      this.billingZip = builder.billingZip;
+
+      this.billingCountry = builder.billingCountry;
+
+      this.ipAddress = builder.ipAddress;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getNumber() {
+      return number;
+    }
+
+    public Integer getExpiryMonth() {
+      return expiryMonth;
+    }
+
+    public Integer getExpiryYear() {
+      return expiryYear;
+    }
+
+    public String getCvv() {
+      return cvv;
+    }
+
+    public PreferredScheme getPreferredScheme() {
+      return preferredScheme;
+    }
+
+    public String getBillingAddr1() {
+      return billingAddr1;
+    }
+
+    public String getBillingAddr2() {
+      return billingAddr2;
+    }
+
+    public String getBillingCity() {
+      return billingCity;
+    }
+
+    public String getBillingStateCode() {
+      return billingStateCode;
+    }
+
+    public String getBillingState() {
+      return billingState;
+    }
+
+    public String getBillingZip() {
+      return billingZip;
+    }
+
+    public String getBillingCountry() {
+      return billingCountry;
+    }
+
+    public String getIpAddress() {
+      return ipAddress;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.number != null) {
+
+        formData.put("number", this.number);
+      }
+
+      if (this.expiryMonth != null) {
+
+        formData.put("expiry_month", this.expiryMonth);
+      }
+
+      if (this.expiryYear != null) {
+
+        formData.put("expiry_year", this.expiryYear);
+      }
+
+      if (this.cvv != null) {
+
+        formData.put("cvv", this.cvv);
+      }
+
+      if (this.preferredScheme != null) {
+
+        formData.put("preferred_scheme", this.preferredScheme);
+      }
+
+      if (this.billingAddr1 != null) {
+
+        formData.put("billing_addr1", this.billingAddr1);
+      }
+
+      if (this.billingAddr2 != null) {
+
+        formData.put("billing_addr2", this.billingAddr2);
+      }
+
+      if (this.billingCity != null) {
+
+        formData.put("billing_city", this.billingCity);
+      }
+
+      if (this.billingStateCode != null) {
+
+        formData.put("billing_state_code", this.billingStateCode);
+      }
+
+      if (this.billingState != null) {
+
+        formData.put("billing_state", this.billingState);
+      }
+
+      if (this.billingZip != null) {
+
+        formData.put("billing_zip", this.billingZip);
+      }
+
+      if (this.billingCountry != null) {
+
+        formData.put("billing_country", this.billingCountry);
+      }
+
+      if (this.ipAddress != null) {
+
+        formData.put("ip_address", this.ipAddress);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String tmpToken;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String number;
+
+      private Integer expiryMonth;
+
+      private Integer expiryYear;
+
+      private String cvv;
+
+      private PreferredScheme preferredScheme;
+
+      private String billingAddr1;
+
+      private String billingAddr2;
+
+      private String billingCity;
+
+      private String billingStateCode;
+
+      private String billingState;
+
+      private String billingZip;
+
+      private String billingCountry;
+
+      private String ipAddress;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      @Deprecated
+      public CardBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public CardBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CardBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CardBuilder number(String value) {
+        this.number = value;
+        return this;
+      }
+
+      public CardBuilder expiryMonth(Integer value) {
+        this.expiryMonth = value;
+        return this;
+      }
+
+      public CardBuilder expiryYear(Integer value) {
+        this.expiryYear = value;
+        return this;
+      }
+
+      public CardBuilder cvv(String value) {
+        this.cvv = value;
+        return this;
+      }
+
+      public CardBuilder preferredScheme(PreferredScheme value) {
+        this.preferredScheme = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr1(String value) {
+        this.billingAddr1 = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr2(String value) {
+        this.billingAddr2 = value;
+        return this;
+      }
+
+      public CardBuilder billingCity(String value) {
+        this.billingCity = value;
+        return this;
+      }
+
+      public CardBuilder billingStateCode(String value) {
+        this.billingStateCode = value;
+        return this;
+      }
+
+      public CardBuilder billingState(String value) {
+        this.billingState = value;
+        return this;
+      }
+
+      public CardBuilder billingZip(String value) {
+        this.billingZip = value;
+        return this;
+      }
+
+      public CardBuilder billingCountry(String value) {
+        this.billingCountry = value;
+        return this;
+      }
+
+      @Deprecated
+      public CardBuilder ipAddress(String value) {
+        this.ipAddress = value;
+        return this;
+      }
+
+      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PreferredScheme {
+      CARTES_BANCAIRES("cartes_bancaires"),
+
+      MASTERCARD("mastercard"),
+
+      VISA("visa"),
+
+      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PreferredScheme(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PreferredScheme fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PreferredScheme enumValue : PreferredScheme.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BankAccountParams {
+
+    private final String gatewayAccountId;
+
+    private final String iban;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String company;
+
+    private final String email;
+
+    private final String phone;
+
+    private final String bankName;
+
+    private final String accountNumber;
+
+    private final String routingNumber;
+
+    private final String bankCode;
+
+    private final AccountType accountType;
+
+    private final AccountHolderType accountHolderType;
+
+    private final EcheckType echeckType;
+
+    private final String issuingCountry;
+
+    private final String swedishIdentityNumber;
+
+    private final java.util.Map<String, Object> billingAddress;
+
+    private BankAccountParams(BankAccountBuilder builder) {
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.iban = builder.iban;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.company = builder.company;
+
+      this.email = builder.email;
+
+      this.phone = builder.phone;
+
+      this.bankName = builder.bankName;
+
+      this.accountNumber = builder.accountNumber;
+
+      this.routingNumber = builder.routingNumber;
+
+      this.bankCode = builder.bankCode;
+
+      this.accountType = builder.accountType;
+
+      this.accountHolderType = builder.accountHolderType;
+
+      this.echeckType = builder.echeckType;
+
+      this.issuingCountry = builder.issuingCountry;
+
+      this.swedishIdentityNumber = builder.swedishIdentityNumber;
+
+      this.billingAddress = builder.billingAddress;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getIban() {
+      return iban;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getBankName() {
+      return bankName;
+    }
+
+    public String getAccountNumber() {
+      return accountNumber;
+    }
+
+    public String getRoutingNumber() {
+      return routingNumber;
+    }
+
+    public String getBankCode() {
+      return bankCode;
+    }
+
+    public AccountType getAccountType() {
+      return accountType;
+    }
+
+    public AccountHolderType getAccountHolderType() {
+      return accountHolderType;
+    }
+
+    public EcheckType getEcheckType() {
+      return echeckType;
+    }
+
+    public String getIssuingCountry() {
+      return issuingCountry;
+    }
+
+    public String getSwedishIdentityNumber() {
+      return swedishIdentityNumber;
+    }
+
+    public java.util.Map<String, Object> getBillingAddress() {
+      return billingAddress;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.iban != null) {
+
+        formData.put("iban", this.iban);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.bankName != null) {
+
+        formData.put("bank_name", this.bankName);
+      }
+
+      if (this.accountNumber != null) {
+
+        formData.put("account_number", this.accountNumber);
+      }
+
+      if (this.routingNumber != null) {
+
+        formData.put("routing_number", this.routingNumber);
+      }
+
+      if (this.bankCode != null) {
+
+        formData.put("bank_code", this.bankCode);
+      }
+
+      if (this.accountType != null) {
+
+        formData.put("account_type", this.accountType);
+      }
+
+      if (this.accountHolderType != null) {
+
+        formData.put("account_holder_type", this.accountHolderType);
+      }
+
+      if (this.echeckType != null) {
+
+        formData.put("echeck_type", this.echeckType);
+      }
+
+      if (this.issuingCountry != null) {
+
+        formData.put("issuing_country", this.issuingCountry);
+      }
+
+      if (this.swedishIdentityNumber != null) {
+
+        formData.put("swedish_identity_number", this.swedishIdentityNumber);
+      }
+
+      if (this.billingAddress != null) {
+
+        formData.put("billing_address", JsonUtil.toJson(this.billingAddress));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BankAccountParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BankAccountBuilder builder() {
+      return new BankAccountBuilder();
+    }
+
+    public static final class BankAccountBuilder {
+
+      private String gatewayAccountId;
+
+      private String iban;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String company;
+
+      private String email;
+
+      private String phone;
+
+      private String bankName;
+
+      private String accountNumber;
+
+      private String routingNumber;
+
+      private String bankCode;
+
+      private AccountType accountType;
+
+      private AccountHolderType accountHolderType;
+
+      private EcheckType echeckType;
+
+      private String issuingCountry;
+
+      private String swedishIdentityNumber;
+
+      private java.util.Map<String, Object> billingAddress;
+
+      private BankAccountBuilder() {}
+
+      public BankAccountBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public BankAccountBuilder iban(String value) {
+        this.iban = value;
+        return this;
+      }
+
+      public BankAccountBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BankAccountBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BankAccountBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BankAccountBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BankAccountBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BankAccountBuilder bankName(String value) {
+        this.bankName = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountNumber(String value) {
+        this.accountNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder routingNumber(String value) {
+        this.routingNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder bankCode(String value) {
+        this.bankCode = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountType(AccountType value) {
+        this.accountType = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountHolderType(AccountHolderType value) {
+        this.accountHolderType = value;
+        return this;
+      }
+
+      public BankAccountBuilder echeckType(EcheckType value) {
+        this.echeckType = value;
+        return this;
+      }
+
+      public BankAccountBuilder issuingCountry(String value) {
+        this.issuingCountry = value;
+        return this;
+      }
+
+      public BankAccountBuilder swedishIdentityNumber(String value) {
+        this.swedishIdentityNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder billingAddress(java.util.Map<String, Object> value) {
+        this.billingAddress = value;
+        return this;
+      }
+
+      public BankAccountParams build() {
+        return new BankAccountParams(this);
+      }
+    }
+
+    public enum AccountType {
+      CHECKING("checking"),
+
+      SAVINGS("savings"),
+
+      BUSINESS_CHECKING("business_checking"),
+
+      CURRENT("current"),
+
+      /** An enum member indicating that AccountType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AccountType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AccountType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AccountType enumValue : AccountType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum AccountHolderType {
+      INDIVIDUAL("individual"),
+
+      COMPANY("company"),
+
+      /**
+       * An enum member indicating that AccountHolderType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      AccountHolderType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AccountHolderType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AccountHolderType enumValue : AccountHolderType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum EcheckType {
+      WEB("web"),
+
+      PPD("ppd"),
+
+      CCD("ccd"),
+
+      /** An enum member indicating that EcheckType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EcheckType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EcheckType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EcheckType enumValue : EcheckType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentMethodParams {
+
+    private final Type type;
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String referenceId;
+
+    private final String tmpToken;
+
+    private final String issuingCountry;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentMethodParams(PaymentMethodBuilder builder) {
+
+      this.type = builder.type;
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.referenceId = builder.referenceId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.issuingCountry = builder.issuingCountry;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getIssuingCountry() {
+      return issuingCountry;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.issuingCountry != null) {
+
+        formData.put("issuing_country", this.issuingCountry);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentMethodBuilder builder() {
+      return new PaymentMethodBuilder();
+    }
+
+    public static final class PaymentMethodBuilder {
+
+      private Type type;
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String referenceId;
+
+      private String tmpToken;
+
+      private String issuingCountry;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentMethodBuilder() {}
+
+      public PaymentMethodBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentMethodBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder issuingCountry(String value) {
+        this.issuingCountry = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentMethodParams build() {
+        return new PaymentMethodParams(this);
+      }
+    }
+
+    public enum Type {
+      CARD("card"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      GENERIC("generic"),
+
+      ALIPAY("alipay"),
+
+      UNIONPAY("unionpay"),
+
+      APPLE_PAY("apple_pay"),
+
+      WECHAT_PAY("wechat_pay"),
+
+      IDEAL("ideal"),
+
+      GOOGLE_PAY("google_pay"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GIROPAY("giropay"),
+
+      DOTPAY("dotpay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      VENMO("venmo"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      GOCARDLESS("gocardless"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemPricesParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ItemPricesParams(ItemPricesBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemPricesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemPricesBuilder builder() {
+      return new ItemPricesBuilder();
+    }
+
+    public static final class ItemPricesBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ItemPricesBuilder() {}
+
+      public ItemPricesBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemPricesBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public ItemPricesBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public ItemPricesBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public ItemPricesBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public ItemPricesBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ItemPricesBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ItemPricesParams build() {
+        return new ItemPricesParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChargesParams {
+
+    private final Long amount;
+
+    private final String amountInDecimal;
+
+    private final String description;
+
+    private final Boolean taxable;
+
+    private final String taxProfileId;
+
+    private final String avalaraTaxCode;
+
+    private final String hsnCode;
+
+    private final String taxjarProductCode;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ChargesParams(ChargesBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.description = builder.description;
+
+      this.taxable = builder.taxable;
+
+      this.taxProfileId = builder.taxProfileId;
+
+      this.avalaraTaxCode = builder.avalaraTaxCode;
+
+      this.hsnCode = builder.hsnCode;
+
+      this.taxjarProductCode = builder.taxjarProductCode;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Boolean getTaxable() {
+      return taxable;
+    }
+
+    public String getTaxProfileId() {
+      return taxProfileId;
+    }
+
+    public String getAvalaraTaxCode() {
+      return avalaraTaxCode;
+    }
+
+    public String getHsnCode() {
+      return hsnCode;
+    }
+
+    public String getTaxjarProductCode() {
+      return taxjarProductCode;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.taxable != null) {
+
+        formData.put("taxable", this.taxable);
+      }
+
+      if (this.taxProfileId != null) {
+
+        formData.put("tax_profile_id", this.taxProfileId);
+      }
+
+      if (this.avalaraTaxCode != null) {
+
+        formData.put("avalara_tax_code", this.avalaraTaxCode);
+      }
+
+      if (this.hsnCode != null) {
+
+        formData.put("hsn_code", this.hsnCode);
+      }
+
+      if (this.taxjarProductCode != null) {
+
+        formData.put("taxjar_product_code", this.taxjarProductCode);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargesBuilder builder() {
+      return new ChargesBuilder();
+    }
+
+    public static final class ChargesBuilder {
+
+      private Long amount;
+
+      private String amountInDecimal;
+
+      private String description;
+
+      private Boolean taxable;
+
+      private String taxProfileId;
+
+      private String avalaraTaxCode;
+
+      private String hsnCode;
+
+      private String taxjarProductCode;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ChargesBuilder() {}
+
+      public ChargesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public ChargesBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public ChargesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public ChargesBuilder taxable(Boolean value) {
+        this.taxable = value;
+        return this;
+      }
+
+      public ChargesBuilder taxProfileId(String value) {
+        this.taxProfileId = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTaxCode(String value) {
+        this.avalaraTaxCode = value;
+        return this;
+      }
+
+      public ChargesBuilder hsnCode(String value) {
+        this.hsnCode = value;
+        return this;
+      }
+
+      public ChargesBuilder taxjarProductCode(String value) {
+        this.taxjarProductCode = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public ChargesBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ChargesBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ChargesParams build() {
+        return new ChargesParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class NotesToRemoveParams {
+
+    private final EntityType entityType;
+
+    private final String entityId;
+
+    private NotesToRemoveParams(NotesToRemoveBuilder builder) {
+
+      this.entityType = builder.entityType;
+
+      this.entityId = builder.entityId;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NotesToRemoveParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NotesToRemoveBuilder builder() {
+      return new NotesToRemoveBuilder();
+    }
+
+    public static final class NotesToRemoveBuilder {
+
+      private EntityType entityType;
+
+      private String entityId;
+
+      private NotesToRemoveBuilder() {}
+
+      public NotesToRemoveBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public NotesToRemoveBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public NotesToRemoveParams build() {
+        return new NotesToRemoveParams(this);
+      }
+    }
+
+    public enum EntityType {
+      CUSTOMER("customer"),
+
+      SUBSCRIPTION("subscription"),
+
+      COUPON("coupon"),
+
+      PLAN_ITEM_PRICE("plan_item_price"),
+
+      ADDON_ITEM_PRICE("addon_item_price"),
+
+      CHARGE_ITEM_PRICE("charge_item_price"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer quantity;
+
+    private final ApplyOn applyOn;
+
+    private final String itemPriceId;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.quantity = builder.quantity;
+
+      this.applyOn = builder.applyOn;
+
+      this.itemPriceId = builder.itemPriceId;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer quantity;
+
+      private ApplyOn applyOn;
+
+      private String itemPriceId;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCreateParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCreateParams.java
new file mode 100644
index 00000000..13cdc543
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceCreateParams.java
@@ -0,0 +1,3425 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class InvoiceCreateParams {
+
+  private final String customerId;
+
+  private final String subscriptionId;
+
+  private final String currencyCode;
+
+  private final Timestamp invoiceDate;
+
+  private final String invoiceNote;
+
+  private final Boolean removeGeneralNote;
+
+  private final String poNumber;
+
+  private final String coupon;
+
+  private final List<String> couponIds;
+
+  private final String authorizationTransactionId;
+
+  private final String paymentSourceId;
+
+  private final AutoCollection autoCollection;
+
+  private final String tokenId;
+
+  private final Boolean replacePrimaryPaymentSource;
+
+  private final Boolean retainPaymentSource;
+
+  private final PaymentInitiator paymentInitiator;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final StatementDescriptorParams statementDescriptor;
+
+  private final CardParams card;
+
+  private final BankAccountParams bankAccount;
+
+  private final PaymentMethodParams paymentMethod;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final List<AddonsParams> addons;
+
+  private final List<ChargesParams> charges;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private final List<NotesToRemoveParams> notesToRemove;
+
+  private InvoiceCreateParams(InvoiceCreateBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.invoiceNote = builder.invoiceNote;
+
+    this.removeGeneralNote = builder.removeGeneralNote;
+
+    this.poNumber = builder.poNumber;
+
+    this.coupon = builder.coupon;
+
+    this.couponIds = builder.couponIds;
+
+    this.authorizationTransactionId = builder.authorizationTransactionId;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.tokenId = builder.tokenId;
+
+    this.replacePrimaryPaymentSource = builder.replacePrimaryPaymentSource;
+
+    this.retainPaymentSource = builder.retainPaymentSource;
+
+    this.paymentInitiator = builder.paymentInitiator;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.statementDescriptor = builder.statementDescriptor;
+
+    this.card = builder.card;
+
+    this.bankAccount = builder.bankAccount;
+
+    this.paymentMethod = builder.paymentMethod;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.addons = builder.addons;
+
+    this.charges = builder.charges;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+
+    this.notesToRemove = builder.notesToRemove;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public String getInvoiceNote() {
+    return invoiceNote;
+  }
+
+  public Boolean getRemoveGeneralNote() {
+    return removeGeneralNote;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getAuthorizationTransactionId() {
+    return authorizationTransactionId;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public String getTokenId() {
+    return tokenId;
+  }
+
+  public Boolean getReplacePrimaryPaymentSource() {
+    return replacePrimaryPaymentSource;
+  }
+
+  public Boolean getRetainPaymentSource() {
+    return retainPaymentSource;
+  }
+
+  public PaymentInitiator getPaymentInitiator() {
+    return paymentInitiator;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public StatementDescriptorParams getStatementDescriptor() {
+    return statementDescriptor;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public BankAccountParams getBankAccount() {
+    return bankAccount;
+  }
+
+  public PaymentMethodParams getPaymentMethod() {
+    return paymentMethod;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<ChargesParams> getCharges() {
+    return charges;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  public List<NotesToRemoveParams> getNotesToRemove() {
+    return notesToRemove;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.invoiceNote != null) {
+
+      formData.put("invoice_note", this.invoiceNote);
+    }
+
+    if (this.removeGeneralNote != null) {
+
+      formData.put("remove_general_note", this.removeGeneralNote);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.authorizationTransactionId != null) {
+
+      formData.put("authorization_transaction_id", this.authorizationTransactionId);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.tokenId != null) {
+
+      formData.put("token_id", this.tokenId);
+    }
+
+    if (this.replacePrimaryPaymentSource != null) {
+
+      formData.put("replace_primary_payment_source", this.replacePrimaryPaymentSource);
+    }
+
+    if (this.retainPaymentSource != null) {
+
+      formData.put("retain_payment_source", this.retainPaymentSource);
+    }
+
+    if (this.paymentInitiator != null) {
+
+      formData.put("payment_initiator", this.paymentInitiator);
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.statementDescriptor != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.statementDescriptor.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.bankAccount != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.bankAccount.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "bank_account[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentMethod != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentMethod.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_method[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.charges != null) {
+
+      // List of objects
+      for (int i = 0; i < this.charges.size(); i++) {
+        ChargesParams item = this.charges.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.notesToRemove != null) {
+
+      // List of objects
+      for (int i = 0; i < this.notesToRemove.size(); i++) {
+        NotesToRemoveParams item = this.notesToRemove.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "notes_to_remove[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceCreateBuilder builder() {
+    return new InvoiceCreateBuilder();
+  }
+
+  public static final class InvoiceCreateBuilder {
+
+    private String customerId;
+
+    private String subscriptionId;
+
+    private String currencyCode;
+
+    private Timestamp invoiceDate;
+
+    private String invoiceNote;
+
+    private Boolean removeGeneralNote;
+
+    private String poNumber;
+
+    private String coupon;
+
+    private List<String> couponIds;
+
+    private String authorizationTransactionId;
+
+    private String paymentSourceId;
+
+    private AutoCollection autoCollection;
+
+    private String tokenId;
+
+    private Boolean replacePrimaryPaymentSource;
+
+    private Boolean retainPaymentSource;
+
+    private PaymentInitiator paymentInitiator;
+
+    private ShippingAddressParams shippingAddress;
+
+    private StatementDescriptorParams statementDescriptor;
+
+    private CardParams card;
+
+    private BankAccountParams bankAccount;
+
+    private PaymentMethodParams paymentMethod;
+
+    private PaymentIntentParams paymentIntent;
+
+    private List<AddonsParams> addons;
+
+    private List<ChargesParams> charges;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private List<NotesToRemoveParams> notesToRemove;
+
+    private InvoiceCreateBuilder() {}
+
+    public InvoiceCreateBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder invoiceNote(String value) {
+      this.invoiceNote = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder removeGeneralNote(Boolean value) {
+      this.removeGeneralNote = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    @Deprecated
+    public InvoiceCreateBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder authorizationTransactionId(String value) {
+      this.authorizationTransactionId = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder tokenId(String value) {
+      this.tokenId = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder replacePrimaryPaymentSource(Boolean value) {
+      this.replacePrimaryPaymentSource = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder retainPaymentSource(Boolean value) {
+      this.retainPaymentSource = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder paymentInitiator(PaymentInitiator value) {
+      this.paymentInitiator = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder statementDescriptor(StatementDescriptorParams value) {
+      this.statementDescriptor = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder bankAccount(BankAccountParams value) {
+      this.bankAccount = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder paymentMethod(PaymentMethodParams value) {
+      this.paymentMethod = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder charges(List<ChargesParams> value) {
+      this.charges = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public InvoiceCreateBuilder notesToRemove(List<NotesToRemoveParams> value) {
+      this.notesToRemove = value;
+      return this;
+    }
+
+    public InvoiceCreateParams build() {
+      return new InvoiceCreateParams(this);
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PaymentInitiator {
+    CUSTOMER("customer"),
+
+    MERCHANT("merchant"),
+
+    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentInitiator(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentInitiator fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatementDescriptorParams {
+
+    private final String descriptor;
+
+    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
+
+      this.descriptor = builder.descriptor;
+    }
+
+    public String getDescriptor() {
+      return descriptor;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.descriptor != null) {
+
+        formData.put("descriptor", this.descriptor);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatementDescriptorParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatementDescriptorBuilder builder() {
+      return new StatementDescriptorBuilder();
+    }
+
+    public static final class StatementDescriptorBuilder {
+
+      private String descriptor;
+
+      private StatementDescriptorBuilder() {}
+
+      public StatementDescriptorBuilder descriptor(String value) {
+        this.descriptor = value;
+        return this;
+      }
+
+      public StatementDescriptorParams build() {
+        return new StatementDescriptorParams(this);
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String tmpToken;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String number;
+
+    private final Integer expiryMonth;
+
+    private final Integer expiryYear;
+
+    private final String cvv;
+
+    private final PreferredScheme preferredScheme;
+
+    private final String billingAddr1;
+
+    private final String billingAddr2;
+
+    private final String billingCity;
+
+    private final String billingStateCode;
+
+    private final String billingState;
+
+    private final String billingZip;
+
+    private final String billingCountry;
+
+    private final String ipAddress;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.number = builder.number;
+
+      this.expiryMonth = builder.expiryMonth;
+
+      this.expiryYear = builder.expiryYear;
+
+      this.cvv = builder.cvv;
+
+      this.preferredScheme = builder.preferredScheme;
+
+      this.billingAddr1 = builder.billingAddr1;
+
+      this.billingAddr2 = builder.billingAddr2;
+
+      this.billingCity = builder.billingCity;
+
+      this.billingStateCode = builder.billingStateCode;
+
+      this.billingState = builder.billingState;
+
+      this.billingZip = builder.billingZip;
+
+      this.billingCountry = builder.billingCountry;
+
+      this.ipAddress = builder.ipAddress;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getNumber() {
+      return number;
+    }
+
+    public Integer getExpiryMonth() {
+      return expiryMonth;
+    }
+
+    public Integer getExpiryYear() {
+      return expiryYear;
+    }
+
+    public String getCvv() {
+      return cvv;
+    }
+
+    public PreferredScheme getPreferredScheme() {
+      return preferredScheme;
+    }
+
+    public String getBillingAddr1() {
+      return billingAddr1;
+    }
+
+    public String getBillingAddr2() {
+      return billingAddr2;
+    }
+
+    public String getBillingCity() {
+      return billingCity;
+    }
+
+    public String getBillingStateCode() {
+      return billingStateCode;
+    }
+
+    public String getBillingState() {
+      return billingState;
+    }
+
+    public String getBillingZip() {
+      return billingZip;
+    }
+
+    public String getBillingCountry() {
+      return billingCountry;
+    }
+
+    public String getIpAddress() {
+      return ipAddress;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.number != null) {
+
+        formData.put("number", this.number);
+      }
+
+      if (this.expiryMonth != null) {
+
+        formData.put("expiry_month", this.expiryMonth);
+      }
+
+      if (this.expiryYear != null) {
+
+        formData.put("expiry_year", this.expiryYear);
+      }
+
+      if (this.cvv != null) {
+
+        formData.put("cvv", this.cvv);
+      }
+
+      if (this.preferredScheme != null) {
+
+        formData.put("preferred_scheme", this.preferredScheme);
+      }
+
+      if (this.billingAddr1 != null) {
+
+        formData.put("billing_addr1", this.billingAddr1);
+      }
+
+      if (this.billingAddr2 != null) {
+
+        formData.put("billing_addr2", this.billingAddr2);
+      }
+
+      if (this.billingCity != null) {
+
+        formData.put("billing_city", this.billingCity);
+      }
+
+      if (this.billingStateCode != null) {
+
+        formData.put("billing_state_code", this.billingStateCode);
+      }
+
+      if (this.billingState != null) {
+
+        formData.put("billing_state", this.billingState);
+      }
+
+      if (this.billingZip != null) {
+
+        formData.put("billing_zip", this.billingZip);
+      }
+
+      if (this.billingCountry != null) {
+
+        formData.put("billing_country", this.billingCountry);
+      }
+
+      if (this.ipAddress != null) {
+
+        formData.put("ip_address", this.ipAddress);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String tmpToken;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String number;
+
+      private Integer expiryMonth;
+
+      private Integer expiryYear;
+
+      private String cvv;
+
+      private PreferredScheme preferredScheme;
+
+      private String billingAddr1;
+
+      private String billingAddr2;
+
+      private String billingCity;
+
+      private String billingStateCode;
+
+      private String billingState;
+
+      private String billingZip;
+
+      private String billingCountry;
+
+      private String ipAddress;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      @Deprecated
+      public CardBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public CardBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CardBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CardBuilder number(String value) {
+        this.number = value;
+        return this;
+      }
+
+      public CardBuilder expiryMonth(Integer value) {
+        this.expiryMonth = value;
+        return this;
+      }
+
+      public CardBuilder expiryYear(Integer value) {
+        this.expiryYear = value;
+        return this;
+      }
+
+      public CardBuilder cvv(String value) {
+        this.cvv = value;
+        return this;
+      }
+
+      public CardBuilder preferredScheme(PreferredScheme value) {
+        this.preferredScheme = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr1(String value) {
+        this.billingAddr1 = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr2(String value) {
+        this.billingAddr2 = value;
+        return this;
+      }
+
+      public CardBuilder billingCity(String value) {
+        this.billingCity = value;
+        return this;
+      }
+
+      public CardBuilder billingStateCode(String value) {
+        this.billingStateCode = value;
+        return this;
+      }
+
+      public CardBuilder billingState(String value) {
+        this.billingState = value;
+        return this;
+      }
+
+      public CardBuilder billingZip(String value) {
+        this.billingZip = value;
+        return this;
+      }
+
+      public CardBuilder billingCountry(String value) {
+        this.billingCountry = value;
+        return this;
+      }
+
+      @Deprecated
+      public CardBuilder ipAddress(String value) {
+        this.ipAddress = value;
+        return this;
+      }
+
+      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PreferredScheme {
+      CARTES_BANCAIRES("cartes_bancaires"),
+
+      MASTERCARD("mastercard"),
+
+      VISA("visa"),
+
+      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PreferredScheme(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PreferredScheme fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PreferredScheme enumValue : PreferredScheme.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BankAccountParams {
+
+    private final String gatewayAccountId;
+
+    private final String iban;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String company;
+
+    private final String email;
+
+    private final String phone;
+
+    private final String bankName;
+
+    private final String accountNumber;
+
+    private final String routingNumber;
+
+    private final String bankCode;
+
+    private final AccountType accountType;
+
+    private final AccountHolderType accountHolderType;
+
+    private final EcheckType echeckType;
+
+    private final String issuingCountry;
+
+    private final String swedishIdentityNumber;
+
+    private final java.util.Map<String, Object> billingAddress;
+
+    private BankAccountParams(BankAccountBuilder builder) {
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.iban = builder.iban;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.company = builder.company;
+
+      this.email = builder.email;
+
+      this.phone = builder.phone;
+
+      this.bankName = builder.bankName;
+
+      this.accountNumber = builder.accountNumber;
+
+      this.routingNumber = builder.routingNumber;
+
+      this.bankCode = builder.bankCode;
+
+      this.accountType = builder.accountType;
+
+      this.accountHolderType = builder.accountHolderType;
+
+      this.echeckType = builder.echeckType;
+
+      this.issuingCountry = builder.issuingCountry;
+
+      this.swedishIdentityNumber = builder.swedishIdentityNumber;
+
+      this.billingAddress = builder.billingAddress;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getIban() {
+      return iban;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getBankName() {
+      return bankName;
+    }
+
+    public String getAccountNumber() {
+      return accountNumber;
+    }
+
+    public String getRoutingNumber() {
+      return routingNumber;
+    }
+
+    public String getBankCode() {
+      return bankCode;
+    }
+
+    public AccountType getAccountType() {
+      return accountType;
+    }
+
+    public AccountHolderType getAccountHolderType() {
+      return accountHolderType;
+    }
+
+    public EcheckType getEcheckType() {
+      return echeckType;
+    }
+
+    public String getIssuingCountry() {
+      return issuingCountry;
+    }
+
+    public String getSwedishIdentityNumber() {
+      return swedishIdentityNumber;
+    }
+
+    public java.util.Map<String, Object> getBillingAddress() {
+      return billingAddress;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.iban != null) {
+
+        formData.put("iban", this.iban);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.bankName != null) {
+
+        formData.put("bank_name", this.bankName);
+      }
+
+      if (this.accountNumber != null) {
+
+        formData.put("account_number", this.accountNumber);
+      }
+
+      if (this.routingNumber != null) {
+
+        formData.put("routing_number", this.routingNumber);
+      }
+
+      if (this.bankCode != null) {
+
+        formData.put("bank_code", this.bankCode);
+      }
+
+      if (this.accountType != null) {
+
+        formData.put("account_type", this.accountType);
+      }
+
+      if (this.accountHolderType != null) {
+
+        formData.put("account_holder_type", this.accountHolderType);
+      }
+
+      if (this.echeckType != null) {
+
+        formData.put("echeck_type", this.echeckType);
+      }
+
+      if (this.issuingCountry != null) {
+
+        formData.put("issuing_country", this.issuingCountry);
+      }
+
+      if (this.swedishIdentityNumber != null) {
+
+        formData.put("swedish_identity_number", this.swedishIdentityNumber);
+      }
+
+      if (this.billingAddress != null) {
+
+        formData.put("billing_address", JsonUtil.toJson(this.billingAddress));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BankAccountParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BankAccountBuilder builder() {
+      return new BankAccountBuilder();
+    }
+
+    public static final class BankAccountBuilder {
+
+      private String gatewayAccountId;
+
+      private String iban;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String company;
+
+      private String email;
+
+      private String phone;
+
+      private String bankName;
+
+      private String accountNumber;
+
+      private String routingNumber;
+
+      private String bankCode;
+
+      private AccountType accountType;
+
+      private AccountHolderType accountHolderType;
+
+      private EcheckType echeckType;
+
+      private String issuingCountry;
+
+      private String swedishIdentityNumber;
+
+      private java.util.Map<String, Object> billingAddress;
+
+      private BankAccountBuilder() {}
+
+      public BankAccountBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public BankAccountBuilder iban(String value) {
+        this.iban = value;
+        return this;
+      }
+
+      public BankAccountBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BankAccountBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BankAccountBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BankAccountBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BankAccountBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BankAccountBuilder bankName(String value) {
+        this.bankName = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountNumber(String value) {
+        this.accountNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder routingNumber(String value) {
+        this.routingNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder bankCode(String value) {
+        this.bankCode = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountType(AccountType value) {
+        this.accountType = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountHolderType(AccountHolderType value) {
+        this.accountHolderType = value;
+        return this;
+      }
+
+      public BankAccountBuilder echeckType(EcheckType value) {
+        this.echeckType = value;
+        return this;
+      }
+
+      public BankAccountBuilder issuingCountry(String value) {
+        this.issuingCountry = value;
+        return this;
+      }
+
+      public BankAccountBuilder swedishIdentityNumber(String value) {
+        this.swedishIdentityNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder billingAddress(java.util.Map<String, Object> value) {
+        this.billingAddress = value;
+        return this;
+      }
+
+      public BankAccountParams build() {
+        return new BankAccountParams(this);
+      }
+    }
+
+    public enum AccountType {
+      CHECKING("checking"),
+
+      SAVINGS("savings"),
+
+      BUSINESS_CHECKING("business_checking"),
+
+      CURRENT("current"),
+
+      /** An enum member indicating that AccountType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AccountType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AccountType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AccountType enumValue : AccountType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum AccountHolderType {
+      INDIVIDUAL("individual"),
+
+      COMPANY("company"),
+
+      /**
+       * An enum member indicating that AccountHolderType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      AccountHolderType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AccountHolderType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AccountHolderType enumValue : AccountHolderType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum EcheckType {
+      WEB("web"),
+
+      PPD("ppd"),
+
+      CCD("ccd"),
+
+      /** An enum member indicating that EcheckType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EcheckType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EcheckType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EcheckType enumValue : EcheckType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentMethodParams {
+
+    private final Type type;
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String referenceId;
+
+    private final String tmpToken;
+
+    private final String issuingCountry;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentMethodParams(PaymentMethodBuilder builder) {
+
+      this.type = builder.type;
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.referenceId = builder.referenceId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.issuingCountry = builder.issuingCountry;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getIssuingCountry() {
+      return issuingCountry;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.issuingCountry != null) {
+
+        formData.put("issuing_country", this.issuingCountry);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentMethodBuilder builder() {
+      return new PaymentMethodBuilder();
+    }
+
+    public static final class PaymentMethodBuilder {
+
+      private Type type;
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String referenceId;
+
+      private String tmpToken;
+
+      private String issuingCountry;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentMethodBuilder() {}
+
+      public PaymentMethodBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentMethodBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder issuingCountry(String value) {
+        this.issuingCountry = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentMethodParams build() {
+        return new PaymentMethodParams(this);
+      }
+    }
+
+    public enum Type {
+      CARD("card"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      GENERIC("generic"),
+
+      ALIPAY("alipay"),
+
+      UNIONPAY("unionpay"),
+
+      APPLE_PAY("apple_pay"),
+
+      WECHAT_PAY("wechat_pay"),
+
+      IDEAL("ideal"),
+
+      GOOGLE_PAY("google_pay"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GIROPAY("giropay"),
+
+      DOTPAY("dotpay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      VENMO("venmo"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      GOCARDLESS("gocardless"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public AddonsBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class ChargesParams {
+
+    private final Long amount;
+
+    private final String amountInDecimal;
+
+    private final String description;
+
+    private final Boolean taxable;
+
+    private final String taxProfileId;
+
+    private final String avalaraTaxCode;
+
+    private final String hsnCode;
+
+    private final String taxjarProductCode;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ChargesParams(ChargesBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.description = builder.description;
+
+      this.taxable = builder.taxable;
+
+      this.taxProfileId = builder.taxProfileId;
+
+      this.avalaraTaxCode = builder.avalaraTaxCode;
+
+      this.hsnCode = builder.hsnCode;
+
+      this.taxjarProductCode = builder.taxjarProductCode;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Boolean getTaxable() {
+      return taxable;
+    }
+
+    public String getTaxProfileId() {
+      return taxProfileId;
+    }
+
+    public String getAvalaraTaxCode() {
+      return avalaraTaxCode;
+    }
+
+    public String getHsnCode() {
+      return hsnCode;
+    }
+
+    public String getTaxjarProductCode() {
+      return taxjarProductCode;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.taxable != null) {
+
+        formData.put("taxable", this.taxable);
+      }
+
+      if (this.taxProfileId != null) {
+
+        formData.put("tax_profile_id", this.taxProfileId);
+      }
+
+      if (this.avalaraTaxCode != null) {
+
+        formData.put("avalara_tax_code", this.avalaraTaxCode);
+      }
+
+      if (this.hsnCode != null) {
+
+        formData.put("hsn_code", this.hsnCode);
+      }
+
+      if (this.taxjarProductCode != null) {
+
+        formData.put("taxjar_product_code", this.taxjarProductCode);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargesBuilder builder() {
+      return new ChargesBuilder();
+    }
+
+    public static final class ChargesBuilder {
+
+      private Long amount;
+
+      private String amountInDecimal;
+
+      private String description;
+
+      private Boolean taxable;
+
+      private String taxProfileId;
+
+      private String avalaraTaxCode;
+
+      private String hsnCode;
+
+      private String taxjarProductCode;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ChargesBuilder() {}
+
+      public ChargesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public ChargesBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public ChargesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public ChargesBuilder taxable(Boolean value) {
+        this.taxable = value;
+        return this;
+      }
+
+      public ChargesBuilder taxProfileId(String value) {
+        this.taxProfileId = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTaxCode(String value) {
+        this.avalaraTaxCode = value;
+        return this;
+      }
+
+      public ChargesBuilder hsnCode(String value) {
+        this.hsnCode = value;
+        return this;
+      }
+
+      public ChargesBuilder taxjarProductCode(String value) {
+        this.taxjarProductCode = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public ChargesBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ChargesBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ChargesParams build() {
+        return new ChargesParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+
+  public static final class NotesToRemoveParams {
+
+    private final EntityType entityType;
+
+    private final String entityId;
+
+    private NotesToRemoveParams(NotesToRemoveBuilder builder) {
+
+      this.entityType = builder.entityType;
+
+      this.entityId = builder.entityId;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for NotesToRemoveParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static NotesToRemoveBuilder builder() {
+      return new NotesToRemoveBuilder();
+    }
+
+    public static final class NotesToRemoveBuilder {
+
+      private EntityType entityType;
+
+      private String entityId;
+
+      private NotesToRemoveBuilder() {}
+
+      public NotesToRemoveBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public NotesToRemoveBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public NotesToRemoveParams build() {
+        return new NotesToRemoveParams(this);
+      }
+    }
+
+    public enum EntityType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CUSTOMER("customer"),
+
+      SUBSCRIPTION("subscription"),
+
+      COUPON("coupon"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceDeleteImportedParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceDeleteImportedParams.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceDeleteImportedParams.java
rename to src/main/java/com/chargebee/v4/models/invoice/params/InvoiceDeleteImportedParams.java
index 13a012aa..f8bef357 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceDeleteImportedParams.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceDeleteImportedParams.java
@@ -4,24 +4,35 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.invoice.params;
+package com.chargebee.v4.models.invoice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class InvoiceDeleteImportedParams {
 
-  private final Map<String, Object> formData;
+  private final String comment;
 
   private InvoiceDeleteImportedParams(InvoiceDeleteImportedBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
+
+    this.comment = builder.comment;
+  }
+
+  public String getComment() {
+    return comment;
   }
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
     return formData;
   }
 
@@ -32,14 +43,13 @@ public static InvoiceDeleteImportedBuilder builder() {
   }
 
   public static final class InvoiceDeleteImportedBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
+
+    private String comment;
 
     private InvoiceDeleteImportedBuilder() {}
 
     public InvoiceDeleteImportedBuilder comment(String value) {
-
-      formData.put("comment", value);
-
+      this.comment = value;
       return this;
     }
 
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceDeleteLineItemsParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceDeleteLineItemsParams.java
new file mode 100644
index 00000000..1f0b0a44
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceDeleteLineItemsParams.java
@@ -0,0 +1,119 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class InvoiceDeleteLineItemsParams {
+
+  private final List<LineItemsParams> lineItems;
+
+  private InvoiceDeleteLineItemsParams(InvoiceDeleteLineItemsBuilder builder) {
+
+    this.lineItems = builder.lineItems;
+  }
+
+  public List<LineItemsParams> getLineItems() {
+    return lineItems;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.lineItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.lineItems.size(); i++) {
+        LineItemsParams item = this.lineItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "line_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceDeleteLineItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceDeleteLineItemsBuilder builder() {
+    return new InvoiceDeleteLineItemsBuilder();
+  }
+
+  public static final class InvoiceDeleteLineItemsBuilder {
+
+    private List<LineItemsParams> lineItems;
+
+    private InvoiceDeleteLineItemsBuilder() {}
+
+    public InvoiceDeleteLineItemsBuilder lineItems(List<LineItemsParams> value) {
+      this.lineItems = value;
+      return this;
+    }
+
+    public InvoiceDeleteLineItemsParams build() {
+      return new InvoiceDeleteLineItemsParams(this);
+    }
+  }
+
+  public static final class LineItemsParams {
+
+    private final String id;
+
+    private LineItemsParams(LineItemsBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for LineItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static LineItemsBuilder builder() {
+      return new LineItemsBuilder();
+    }
+
+    public static final class LineItemsBuilder {
+
+      private String id;
+
+      private LineItemsBuilder() {}
+
+      public LineItemsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public LineItemsParams build() {
+        return new LineItemsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceDeleteParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceDeleteParams.java
new file mode 100644
index 00000000..a63a4abc
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceDeleteParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InvoiceDeleteParams {
+
+  private final String comment;
+
+  private InvoiceDeleteParams(InvoiceDeleteBuilder builder) {
+
+    this.comment = builder.comment;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceDeleteBuilder builder() {
+    return new InvoiceDeleteBuilder();
+  }
+
+  public static final class InvoiceDeleteBuilder {
+
+    private String comment;
+
+    private InvoiceDeleteBuilder() {}
+
+    public InvoiceDeleteBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceDeleteParams build() {
+      return new InvoiceDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceListParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceListParams.java
rename to src/main/java/com/chargebee/v4/models/invoice/params/InvoiceListParams.java
index 2928ae1d..902c0ad6 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceListParams.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.invoice.params;
+package com.chargebee.v4.models.invoice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceListPaymentReferenceNumbersParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceListPaymentReferenceNumbersParams.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceListPaymentReferenceNumbersParams.java
rename to src/main/java/com/chargebee/v4/models/invoice/params/InvoiceListPaymentReferenceNumbersParams.java
index 13ca3aa4..74b98c2a 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceListPaymentReferenceNumbersParams.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceListPaymentReferenceNumbersParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.invoice.params;
+package com.chargebee.v4.models.invoice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
@@ -78,13 +78,13 @@ public static final class IdFilter {
         this.builder = builder;
       }
 
-      public InvoiceListPaymentReferenceNumbersBuilder in(String... values) {
-        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
+      public InvoiceListPaymentReferenceNumbersBuilder is(String value) {
+        builder.queryParams.put(fieldName + "[is]", value);
         return builder;
       }
 
-      public InvoiceListPaymentReferenceNumbersBuilder is(String value) {
-        builder.queryParams.put(fieldName + "[is]", value);
+      public InvoiceListPaymentReferenceNumbersBuilder in(String... values) {
+        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
         return builder;
       }
     }
@@ -137,13 +137,13 @@ public static final class NumberFilter {
           this.builder = builder;
         }
 
-        public PaymentReferenceNumberBuilder in(String... values) {
-          builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
+        public PaymentReferenceNumberBuilder is(String value) {
+          builder.queryParams.put(fieldName + "[is]", value);
           return builder;
         }
 
-        public PaymentReferenceNumberBuilder is(String value) {
-          builder.queryParams.put(fieldName + "[is]", value);
+        public PaymentReferenceNumberBuilder in(String... values) {
+          builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
           return builder;
         }
       }
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoicePauseDunningParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoicePauseDunningParams.java
new file mode 100644
index 00000000..969f6f05
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoicePauseDunningParams.java
@@ -0,0 +1,81 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class InvoicePauseDunningParams {
+
+  private final Timestamp expectedPaymentDate;
+
+  private final String comment;
+
+  private InvoicePauseDunningParams(InvoicePauseDunningBuilder builder) {
+
+    this.expectedPaymentDate = builder.expectedPaymentDate;
+
+    this.comment = builder.comment;
+  }
+
+  public Timestamp getExpectedPaymentDate() {
+    return expectedPaymentDate;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.expectedPaymentDate != null) {
+
+      formData.put("expected_payment_date", this.expectedPaymentDate);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoicePauseDunningParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoicePauseDunningBuilder builder() {
+    return new InvoicePauseDunningBuilder();
+  }
+
+  public static final class InvoicePauseDunningBuilder {
+
+    private Timestamp expectedPaymentDate;
+
+    private String comment;
+
+    private InvoicePauseDunningBuilder() {}
+
+    public InvoicePauseDunningBuilder expectedPaymentDate(Timestamp value) {
+      this.expectedPaymentDate = value;
+      return this;
+    }
+
+    public InvoicePauseDunningBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoicePauseDunningParams build() {
+      return new InvoicePauseDunningParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoicePaymentSchedulesParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoicePaymentSchedulesParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/invoice/params/InvoicePaymentSchedulesParams.java
rename to src/main/java/com/chargebee/v4/models/invoice/params/InvoicePaymentSchedulesParams.java
index 899925b0..d669f9a4 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoicePaymentSchedulesParams.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoicePaymentSchedulesParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.invoice.params;
+package com.chargebee.v4.models.invoice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoicePdfParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoicePdfParams.java
similarity index 78%
rename from src/main/java/com/chargebee/v4/core/models/invoice/params/InvoicePdfParams.java
rename to src/main/java/com/chargebee/v4/models/invoice/params/InvoicePdfParams.java
index 4f094c11..0e871dee 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoicePdfParams.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoicePdfParams.java
@@ -4,24 +4,35 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.invoice.params;
+package com.chargebee.v4.models.invoice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class InvoicePdfParams {
 
-  private final Map<String, Object> formData;
+  private final DispositionType dispositionType;
 
   private InvoicePdfParams(InvoicePdfBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
+
+    this.dispositionType = builder.dispositionType;
+  }
+
+  public DispositionType getDispositionType() {
+    return dispositionType;
   }
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.dispositionType != null) {
+
+      formData.put("disposition_type", this.dispositionType);
+    }
+
     return formData;
   }
 
@@ -32,14 +43,13 @@ public static InvoicePdfBuilder builder() {
   }
 
   public static final class InvoicePdfBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
+
+    private DispositionType dispositionType;
 
     private InvoicePdfBuilder() {}
 
     public InvoicePdfBuilder dispositionType(DispositionType value) {
-
-      formData.put("disposition_type", value);
-
+      this.dispositionType = value;
       return this;
     }
 
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRecordPaymentParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRecordPaymentParams.java
new file mode 100644
index 00000000..abbcba9d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRecordPaymentParams.java
@@ -0,0 +1,362 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class InvoiceRecordPaymentParams {
+
+  private final String comment;
+
+  private final TransactionParams transaction;
+
+  private InvoiceRecordPaymentParams(InvoiceRecordPaymentBuilder builder) {
+
+    this.comment = builder.comment;
+
+    this.transaction = builder.transaction;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public TransactionParams getTransaction() {
+    return transaction;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.transaction != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.transaction.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "transaction[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceRecordPaymentParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceRecordPaymentBuilder builder() {
+    return new InvoiceRecordPaymentBuilder();
+  }
+
+  public static final class InvoiceRecordPaymentBuilder {
+
+    private String comment;
+
+    private TransactionParams transaction;
+
+    private InvoiceRecordPaymentBuilder() {}
+
+    public InvoiceRecordPaymentBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceRecordPaymentBuilder transaction(TransactionParams value) {
+      this.transaction = value;
+      return this;
+    }
+
+    public InvoiceRecordPaymentParams build() {
+      return new InvoiceRecordPaymentParams(this);
+    }
+  }
+
+  public static final class TransactionParams {
+
+    private final Long amount;
+
+    private final PaymentMethod paymentMethod;
+
+    private final String referenceNumber;
+
+    private final String customPaymentMethodId;
+
+    private final String idAtGateway;
+
+    private final Status status;
+
+    private final Timestamp date;
+
+    private final String errorCode;
+
+    private final String errorText;
+
+    private TransactionParams(TransactionBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.paymentMethod = builder.paymentMethod;
+
+      this.referenceNumber = builder.referenceNumber;
+
+      this.customPaymentMethodId = builder.customPaymentMethodId;
+
+      this.idAtGateway = builder.idAtGateway;
+
+      this.status = builder.status;
+
+      this.date = builder.date;
+
+      this.errorCode = builder.errorCode;
+
+      this.errorText = builder.errorText;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public PaymentMethod getPaymentMethod() {
+      return paymentMethod;
+    }
+
+    public String getReferenceNumber() {
+      return referenceNumber;
+    }
+
+    public String getCustomPaymentMethodId() {
+      return customPaymentMethodId;
+    }
+
+    public String getIdAtGateway() {
+      return idAtGateway;
+    }
+
+    public Status getStatus() {
+      return status;
+    }
+
+    public Timestamp getDate() {
+      return date;
+    }
+
+    public String getErrorCode() {
+      return errorCode;
+    }
+
+    public String getErrorText() {
+      return errorText;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.paymentMethod != null) {
+
+        formData.put("payment_method", this.paymentMethod);
+      }
+
+      if (this.referenceNumber != null) {
+
+        formData.put("reference_number", this.referenceNumber);
+      }
+
+      if (this.customPaymentMethodId != null) {
+
+        formData.put("custom_payment_method_id", this.customPaymentMethodId);
+      }
+
+      if (this.idAtGateway != null) {
+
+        formData.put("id_at_gateway", this.idAtGateway);
+      }
+
+      if (this.status != null) {
+
+        formData.put("status", this.status);
+      }
+
+      if (this.date != null) {
+
+        formData.put("date", this.date);
+      }
+
+      if (this.errorCode != null) {
+
+        formData.put("error_code", this.errorCode);
+      }
+
+      if (this.errorText != null) {
+
+        formData.put("error_text", this.errorText);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TransactionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TransactionBuilder builder() {
+      return new TransactionBuilder();
+    }
+
+    public static final class TransactionBuilder {
+
+      private Long amount;
+
+      private PaymentMethod paymentMethod;
+
+      private String referenceNumber;
+
+      private String customPaymentMethodId;
+
+      private String idAtGateway;
+
+      private Status status;
+
+      private Timestamp date;
+
+      private String errorCode;
+
+      private String errorText;
+
+      private TransactionBuilder() {}
+
+      public TransactionBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public TransactionBuilder paymentMethod(PaymentMethod value) {
+        this.paymentMethod = value;
+        return this;
+      }
+
+      public TransactionBuilder referenceNumber(String value) {
+        this.referenceNumber = value;
+        return this;
+      }
+
+      public TransactionBuilder customPaymentMethodId(String value) {
+        this.customPaymentMethodId = value;
+        return this;
+      }
+
+      public TransactionBuilder idAtGateway(String value) {
+        this.idAtGateway = value;
+        return this;
+      }
+
+      public TransactionBuilder status(Status value) {
+        this.status = value;
+        return this;
+      }
+
+      public TransactionBuilder date(Timestamp value) {
+        this.date = value;
+        return this;
+      }
+
+      public TransactionBuilder errorCode(String value) {
+        this.errorCode = value;
+        return this;
+      }
+
+      public TransactionBuilder errorText(String value) {
+        this.errorText = value;
+        return this;
+      }
+
+      public TransactionParams build() {
+        return new TransactionParams(this);
+      }
+    }
+
+    public enum PaymentMethod {
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      OTHER("other"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethod enumValue : PaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum Status {
+      SUCCESS("success"),
+
+      FAILURE("failure"),
+
+      LATE_FAILURE("late_failure"),
+
+      /** An enum member indicating that Status was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Status(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Status fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Status enumValue : Status.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRecordRefundParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRecordRefundParams.java
new file mode 100644
index 00000000..bcfab083
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRecordRefundParams.java
@@ -0,0 +1,405 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class InvoiceRecordRefundParams {
+
+  private final String comment;
+
+  private final String customerNotes;
+
+  private final TransactionParams transaction;
+
+  private final CreditNoteParams creditNote;
+
+  private InvoiceRecordRefundParams(InvoiceRecordRefundBuilder builder) {
+
+    this.comment = builder.comment;
+
+    this.customerNotes = builder.customerNotes;
+
+    this.transaction = builder.transaction;
+
+    this.creditNote = builder.creditNote;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public String getCustomerNotes() {
+    return customerNotes;
+  }
+
+  public TransactionParams getTransaction() {
+    return transaction;
+  }
+
+  public CreditNoteParams getCreditNote() {
+    return creditNote;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.customerNotes != null) {
+
+      formData.put("customer_notes", this.customerNotes);
+    }
+
+    if (this.transaction != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.transaction.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "transaction[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.creditNote != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.creditNote.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "credit_note[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceRecordRefundParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceRecordRefundBuilder builder() {
+    return new InvoiceRecordRefundBuilder();
+  }
+
+  public static final class InvoiceRecordRefundBuilder {
+
+    private String comment;
+
+    private String customerNotes;
+
+    private TransactionParams transaction;
+
+    private CreditNoteParams creditNote;
+
+    private InvoiceRecordRefundBuilder() {}
+
+    public InvoiceRecordRefundBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceRecordRefundBuilder customerNotes(String value) {
+      this.customerNotes = value;
+      return this;
+    }
+
+    public InvoiceRecordRefundBuilder transaction(TransactionParams value) {
+      this.transaction = value;
+      return this;
+    }
+
+    public InvoiceRecordRefundBuilder creditNote(CreditNoteParams value) {
+      this.creditNote = value;
+      return this;
+    }
+
+    public InvoiceRecordRefundParams build() {
+      return new InvoiceRecordRefundParams(this);
+    }
+  }
+
+  public static final class TransactionParams {
+
+    private final Long amount;
+
+    private final PaymentMethod paymentMethod;
+
+    private final String referenceNumber;
+
+    private final String customPaymentMethodId;
+
+    private final Timestamp date;
+
+    private TransactionParams(TransactionBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.paymentMethod = builder.paymentMethod;
+
+      this.referenceNumber = builder.referenceNumber;
+
+      this.customPaymentMethodId = builder.customPaymentMethodId;
+
+      this.date = builder.date;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public PaymentMethod getPaymentMethod() {
+      return paymentMethod;
+    }
+
+    public String getReferenceNumber() {
+      return referenceNumber;
+    }
+
+    public String getCustomPaymentMethodId() {
+      return customPaymentMethodId;
+    }
+
+    public Timestamp getDate() {
+      return date;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.paymentMethod != null) {
+
+        formData.put("payment_method", this.paymentMethod);
+      }
+
+      if (this.referenceNumber != null) {
+
+        formData.put("reference_number", this.referenceNumber);
+      }
+
+      if (this.customPaymentMethodId != null) {
+
+        formData.put("custom_payment_method_id", this.customPaymentMethodId);
+      }
+
+      if (this.date != null) {
+
+        formData.put("date", this.date);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TransactionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TransactionBuilder builder() {
+      return new TransactionBuilder();
+    }
+
+    public static final class TransactionBuilder {
+
+      private Long amount;
+
+      private PaymentMethod paymentMethod;
+
+      private String referenceNumber;
+
+      private String customPaymentMethodId;
+
+      private Timestamp date;
+
+      private TransactionBuilder() {}
+
+      public TransactionBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public TransactionBuilder paymentMethod(PaymentMethod value) {
+        this.paymentMethod = value;
+        return this;
+      }
+
+      public TransactionBuilder referenceNumber(String value) {
+        this.referenceNumber = value;
+        return this;
+      }
+
+      public TransactionBuilder customPaymentMethodId(String value) {
+        this.customPaymentMethodId = value;
+        return this;
+      }
+
+      public TransactionBuilder date(Timestamp value) {
+        this.date = value;
+        return this;
+      }
+
+      public TransactionParams build() {
+        return new TransactionParams(this);
+      }
+    }
+
+    public enum PaymentMethod {
+      CASH("cash"),
+
+      CHECK("check"),
+
+      CHARGEBACK("chargeback"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      OTHER("other"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethod enumValue : PaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CreditNoteParams {
+
+    private final ReasonCode reasonCode;
+
+    private final String createReasonCode;
+
+    private CreditNoteParams(CreditNoteBuilder builder) {
+
+      this.reasonCode = builder.reasonCode;
+
+      this.createReasonCode = builder.createReasonCode;
+    }
+
+    public ReasonCode getReasonCode() {
+      return reasonCode;
+    }
+
+    public String getCreateReasonCode() {
+      return createReasonCode;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.reasonCode != null) {
+
+        formData.put("reason_code", this.reasonCode);
+      }
+
+      if (this.createReasonCode != null) {
+
+        formData.put("create_reason_code", this.createReasonCode);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreditNoteParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreditNoteBuilder builder() {
+      return new CreditNoteBuilder();
+    }
+
+    public static final class CreditNoteBuilder {
+
+      private ReasonCode reasonCode;
+
+      private String createReasonCode;
+
+      private CreditNoteBuilder() {}
+
+      public CreditNoteBuilder reasonCode(ReasonCode value) {
+        this.reasonCode = value;
+        return this;
+      }
+
+      public CreditNoteBuilder createReasonCode(String value) {
+        this.createReasonCode = value;
+        return this;
+      }
+
+      public CreditNoteParams build() {
+        return new CreditNoteParams(this);
+      }
+    }
+
+    public enum ReasonCode {
+      CHARGEBACK("chargeback"),
+
+      PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
+
+      SERVICE_UNSATISFACTORY("service_unsatisfactory"),
+
+      ORDER_CHANGE("order_change"),
+
+      ORDER_CANCELLATION("order_cancellation"),
+
+      WAIVER("waiver"),
+
+      OTHER("other"),
+
+      /** An enum member indicating that ReasonCode was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ReasonCode(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ReasonCode fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ReasonCode enumValue : ReasonCode.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRecordTaxWithheldParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRecordTaxWithheldParams.java
new file mode 100644
index 00000000..8442d77b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRecordTaxWithheldParams.java
@@ -0,0 +1,174 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class InvoiceRecordTaxWithheldParams {
+
+  private final TaxWithheldParams taxWithheld;
+
+  private InvoiceRecordTaxWithheldParams(InvoiceRecordTaxWithheldBuilder builder) {
+
+    this.taxWithheld = builder.taxWithheld;
+  }
+
+  public TaxWithheldParams getTaxWithheld() {
+    return taxWithheld;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.taxWithheld != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.taxWithheld.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "tax_withheld[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceRecordTaxWithheldParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceRecordTaxWithheldBuilder builder() {
+    return new InvoiceRecordTaxWithheldBuilder();
+  }
+
+  public static final class InvoiceRecordTaxWithheldBuilder {
+
+    private TaxWithheldParams taxWithheld;
+
+    private InvoiceRecordTaxWithheldBuilder() {}
+
+    public InvoiceRecordTaxWithheldBuilder taxWithheld(TaxWithheldParams value) {
+      this.taxWithheld = value;
+      return this;
+    }
+
+    public InvoiceRecordTaxWithheldParams build() {
+      return new InvoiceRecordTaxWithheldParams(this);
+    }
+  }
+
+  public static final class TaxWithheldParams {
+
+    private final Long amount;
+
+    private final String referenceNumber;
+
+    private final Timestamp date;
+
+    private final String description;
+
+    private TaxWithheldParams(TaxWithheldBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.referenceNumber = builder.referenceNumber;
+
+      this.date = builder.date;
+
+      this.description = builder.description;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getReferenceNumber() {
+      return referenceNumber;
+    }
+
+    public Timestamp getDate() {
+      return date;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.referenceNumber != null) {
+
+        formData.put("reference_number", this.referenceNumber);
+      }
+
+      if (this.date != null) {
+
+        formData.put("date", this.date);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxWithheldParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxWithheldBuilder builder() {
+      return new TaxWithheldBuilder();
+    }
+
+    public static final class TaxWithheldBuilder {
+
+      private Long amount;
+
+      private String referenceNumber;
+
+      private Timestamp date;
+
+      private String description;
+
+      private TaxWithheldBuilder() {}
+
+      public TaxWithheldBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public TaxWithheldBuilder referenceNumber(String value) {
+        this.referenceNumber = value;
+        return this;
+      }
+
+      public TaxWithheldBuilder date(Timestamp value) {
+        this.date = value;
+        return this;
+      }
+
+      public TaxWithheldBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public TaxWithheldParams build() {
+        return new TaxWithheldParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRefundParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRefundParams.java
new file mode 100644
index 00000000..1b0e90a3
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRefundParams.java
@@ -0,0 +1,229 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InvoiceRefundParams {
+
+  private final Long refundAmount;
+
+  private final String comment;
+
+  private final String customerNotes;
+
+  private final CreditNoteParams creditNote;
+
+  private InvoiceRefundParams(InvoiceRefundBuilder builder) {
+
+    this.refundAmount = builder.refundAmount;
+
+    this.comment = builder.comment;
+
+    this.customerNotes = builder.customerNotes;
+
+    this.creditNote = builder.creditNote;
+  }
+
+  public Long getRefundAmount() {
+    return refundAmount;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public String getCustomerNotes() {
+    return customerNotes;
+  }
+
+  public CreditNoteParams getCreditNote() {
+    return creditNote;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.refundAmount != null) {
+
+      formData.put("refund_amount", this.refundAmount);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.customerNotes != null) {
+
+      formData.put("customer_notes", this.customerNotes);
+    }
+
+    if (this.creditNote != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.creditNote.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "credit_note[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceRefundParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceRefundBuilder builder() {
+    return new InvoiceRefundBuilder();
+  }
+
+  public static final class InvoiceRefundBuilder {
+
+    private Long refundAmount;
+
+    private String comment;
+
+    private String customerNotes;
+
+    private CreditNoteParams creditNote;
+
+    private InvoiceRefundBuilder() {}
+
+    public InvoiceRefundBuilder refundAmount(Long value) {
+      this.refundAmount = value;
+      return this;
+    }
+
+    public InvoiceRefundBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceRefundBuilder customerNotes(String value) {
+      this.customerNotes = value;
+      return this;
+    }
+
+    public InvoiceRefundBuilder creditNote(CreditNoteParams value) {
+      this.creditNote = value;
+      return this;
+    }
+
+    public InvoiceRefundParams build() {
+      return new InvoiceRefundParams(this);
+    }
+  }
+
+  public static final class CreditNoteParams {
+
+    private final ReasonCode reasonCode;
+
+    private final String createReasonCode;
+
+    private CreditNoteParams(CreditNoteBuilder builder) {
+
+      this.reasonCode = builder.reasonCode;
+
+      this.createReasonCode = builder.createReasonCode;
+    }
+
+    public ReasonCode getReasonCode() {
+      return reasonCode;
+    }
+
+    public String getCreateReasonCode() {
+      return createReasonCode;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.reasonCode != null) {
+
+        formData.put("reason_code", this.reasonCode);
+      }
+
+      if (this.createReasonCode != null) {
+
+        formData.put("create_reason_code", this.createReasonCode);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreditNoteParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreditNoteBuilder builder() {
+      return new CreditNoteBuilder();
+    }
+
+    public static final class CreditNoteBuilder {
+
+      private ReasonCode reasonCode;
+
+      private String createReasonCode;
+
+      private CreditNoteBuilder() {}
+
+      public CreditNoteBuilder reasonCode(ReasonCode value) {
+        this.reasonCode = value;
+        return this;
+      }
+
+      public CreditNoteBuilder createReasonCode(String value) {
+        this.createReasonCode = value;
+        return this;
+      }
+
+      public CreditNoteParams build() {
+        return new CreditNoteParams(this);
+      }
+    }
+
+    public enum ReasonCode {
+      PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
+
+      SERVICE_UNSATISFACTORY("service_unsatisfactory"),
+
+      ORDER_CHANGE("order_change"),
+
+      ORDER_CANCELLATION("order_cancellation"),
+
+      WAIVER("waiver"),
+
+      OTHER("other"),
+
+      /** An enum member indicating that ReasonCode was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ReasonCode(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ReasonCode fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ReasonCode enumValue : ReasonCode.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRemoveCreditNoteParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRemoveCreditNoteParams.java
new file mode 100644
index 00000000..38bb283c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRemoveCreditNoteParams.java
@@ -0,0 +1,113 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InvoiceRemoveCreditNoteParams {
+
+  private final CreditNoteParams creditNote;
+
+  private InvoiceRemoveCreditNoteParams(InvoiceRemoveCreditNoteBuilder builder) {
+
+    this.creditNote = builder.creditNote;
+  }
+
+  public CreditNoteParams getCreditNote() {
+    return creditNote;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.creditNote != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.creditNote.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "credit_note[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceRemoveCreditNoteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceRemoveCreditNoteBuilder builder() {
+    return new InvoiceRemoveCreditNoteBuilder();
+  }
+
+  public static final class InvoiceRemoveCreditNoteBuilder {
+
+    private CreditNoteParams creditNote;
+
+    private InvoiceRemoveCreditNoteBuilder() {}
+
+    public InvoiceRemoveCreditNoteBuilder creditNote(CreditNoteParams value) {
+      this.creditNote = value;
+      return this;
+    }
+
+    public InvoiceRemoveCreditNoteParams build() {
+      return new InvoiceRemoveCreditNoteParams(this);
+    }
+  }
+
+  public static final class CreditNoteParams {
+
+    private final String id;
+
+    private CreditNoteParams(CreditNoteBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreditNoteParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreditNoteBuilder builder() {
+      return new CreditNoteBuilder();
+    }
+
+    public static final class CreditNoteBuilder {
+
+      private String id;
+
+      private CreditNoteBuilder() {}
+
+      public CreditNoteBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CreditNoteParams build() {
+        return new CreditNoteParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRemovePaymentParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRemovePaymentParams.java
new file mode 100644
index 00000000..cd2c257f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRemovePaymentParams.java
@@ -0,0 +1,113 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InvoiceRemovePaymentParams {
+
+  private final TransactionParams transaction;
+
+  private InvoiceRemovePaymentParams(InvoiceRemovePaymentBuilder builder) {
+
+    this.transaction = builder.transaction;
+  }
+
+  public TransactionParams getTransaction() {
+    return transaction;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.transaction != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.transaction.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "transaction[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceRemovePaymentParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceRemovePaymentBuilder builder() {
+    return new InvoiceRemovePaymentBuilder();
+  }
+
+  public static final class InvoiceRemovePaymentBuilder {
+
+    private TransactionParams transaction;
+
+    private InvoiceRemovePaymentBuilder() {}
+
+    public InvoiceRemovePaymentBuilder transaction(TransactionParams value) {
+      this.transaction = value;
+      return this;
+    }
+
+    public InvoiceRemovePaymentParams build() {
+      return new InvoiceRemovePaymentParams(this);
+    }
+  }
+
+  public static final class TransactionParams {
+
+    private final String id;
+
+    private TransactionParams(TransactionBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TransactionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TransactionBuilder builder() {
+      return new TransactionBuilder();
+    }
+
+    public static final class TransactionBuilder {
+
+      private String id;
+
+      private TransactionBuilder() {}
+
+      public TransactionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public TransactionParams build() {
+        return new TransactionParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRemoveTaxWithheldParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRemoveTaxWithheldParams.java
new file mode 100644
index 00000000..e02606a0
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRemoveTaxWithheldParams.java
@@ -0,0 +1,113 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InvoiceRemoveTaxWithheldParams {
+
+  private final TaxWithheldParams taxWithheld;
+
+  private InvoiceRemoveTaxWithheldParams(InvoiceRemoveTaxWithheldBuilder builder) {
+
+    this.taxWithheld = builder.taxWithheld;
+  }
+
+  public TaxWithheldParams getTaxWithheld() {
+    return taxWithheld;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.taxWithheld != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.taxWithheld.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "tax_withheld[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceRemoveTaxWithheldParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceRemoveTaxWithheldBuilder builder() {
+    return new InvoiceRemoveTaxWithheldBuilder();
+  }
+
+  public static final class InvoiceRemoveTaxWithheldBuilder {
+
+    private TaxWithheldParams taxWithheld;
+
+    private InvoiceRemoveTaxWithheldBuilder() {}
+
+    public InvoiceRemoveTaxWithheldBuilder taxWithheld(TaxWithheldParams value) {
+      this.taxWithheld = value;
+      return this;
+    }
+
+    public InvoiceRemoveTaxWithheldParams build() {
+      return new InvoiceRemoveTaxWithheldParams(this);
+    }
+  }
+
+  public static final class TaxWithheldParams {
+
+    private final String id;
+
+    private TaxWithheldParams(TaxWithheldBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxWithheldParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxWithheldBuilder builder() {
+      return new TaxWithheldBuilder();
+    }
+
+    public static final class TaxWithheldBuilder {
+
+      private String id;
+
+      private TaxWithheldBuilder() {}
+
+      public TaxWithheldBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public TaxWithheldParams build() {
+        return new TaxWithheldParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceResumeDunningParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceResumeDunningParams.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceResumeDunningParams.java
rename to src/main/java/com/chargebee/v4/models/invoice/params/InvoiceResumeDunningParams.java
index 2aa1a19d..70f24cb9 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceResumeDunningParams.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceResumeDunningParams.java
@@ -4,24 +4,35 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.invoice.params;
+package com.chargebee.v4.models.invoice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class InvoiceResumeDunningParams {
 
-  private final Map<String, Object> formData;
+  private final String comment;
 
   private InvoiceResumeDunningParams(InvoiceResumeDunningBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
+
+    this.comment = builder.comment;
+  }
+
+  public String getComment() {
+    return comment;
   }
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
     return formData;
   }
 
@@ -32,14 +43,13 @@ public static InvoiceResumeDunningBuilder builder() {
   }
 
   public static final class InvoiceResumeDunningBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
+
+    private String comment;
 
     private InvoiceResumeDunningBuilder() {}
 
     public InvoiceResumeDunningBuilder comment(String value) {
-
-      formData.put("comment", value);
-
+      this.comment = value;
       return this;
     }
 
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRetrieveParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRetrieveParams.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRetrieveParams.java
index e34bd481..698be53a 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.invoice.params;
+package com.chargebee.v4.models.invoice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
@@ -43,6 +43,16 @@ public static final class InvoiceRetrieveBuilder {
 
     private InvoiceRetrieveBuilder() {}
 
+    public InvoiceRetrieveBuilder lineItemsLimit(Integer value) {
+      queryParams.put("line_items_limit", value);
+      return this;
+    }
+
+    public InvoiceRetrieveBuilder lineItemsOffset(String value) {
+      queryParams.put("line_items_offset", value);
+      return this;
+    }
+
     @Deprecated
     public InvoiceRetrieveBuilder lineItem(LineItemParams value) {
       queryParams.put("line_item", value);
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceStopDunningParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceStopDunningParams.java
new file mode 100644
index 00000000..4476eed6
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceStopDunningParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InvoiceStopDunningParams {
+
+  private final String comment;
+
+  private InvoiceStopDunningParams(InvoiceStopDunningBuilder builder) {
+
+    this.comment = builder.comment;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceStopDunningParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceStopDunningBuilder builder() {
+    return new InvoiceStopDunningBuilder();
+  }
+
+  public static final class InvoiceStopDunningBuilder {
+
+    private String comment;
+
+    private InvoiceStopDunningBuilder() {}
+
+    public InvoiceStopDunningBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceStopDunningParams build() {
+      return new InvoiceStopDunningParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceSyncUsagesParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceSyncUsagesParams.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceSyncUsagesParams.java
rename to src/main/java/com/chargebee/v4/models/invoice/params/InvoiceSyncUsagesParams.java
index f8f0d3f2..021fca06 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoice/params/InvoiceSyncUsagesParams.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceSyncUsagesParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.invoice.params;
+package com.chargebee.v4.models.invoice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class InvoiceSyncUsagesParams {
 
-  private final Map<String, Object> formData;
-
-  private InvoiceSyncUsagesParams(InvoiceSyncUsagesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private InvoiceSyncUsagesParams(InvoiceSyncUsagesBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static InvoiceSyncUsagesBuilder builder() {
   }
 
   public static final class InvoiceSyncUsagesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private InvoiceSyncUsagesBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceUpdateDetailsParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceUpdateDetailsParams.java
new file mode 100644
index 00000000..e5ee0b0e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceUpdateDetailsParams.java
@@ -0,0 +1,975 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InvoiceUpdateDetailsParams {
+
+  private final String vatNumber;
+
+  private final String vatNumberPrefix;
+
+  private final String poNumber;
+
+  private final String comment;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final StatementDescriptorParams statementDescriptor;
+
+  private final Map<String, String> customFields;
+
+  private InvoiceUpdateDetailsParams(InvoiceUpdateDetailsBuilder builder) {
+
+    this.vatNumber = builder.vatNumber;
+
+    this.vatNumberPrefix = builder.vatNumberPrefix;
+
+    this.poNumber = builder.poNumber;
+
+    this.comment = builder.comment;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.statementDescriptor = builder.statementDescriptor;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getVatNumber() {
+    return vatNumber;
+  }
+
+  public String getVatNumberPrefix() {
+    return vatNumberPrefix;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public StatementDescriptorParams getStatementDescriptor() {
+    return statementDescriptor;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.vatNumber != null) {
+
+      formData.put("vat_number", this.vatNumber);
+    }
+
+    if (this.vatNumberPrefix != null) {
+
+      formData.put("vat_number_prefix", this.vatNumberPrefix);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.statementDescriptor != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.statementDescriptor.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceUpdateDetailsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceUpdateDetailsBuilder builder() {
+    return new InvoiceUpdateDetailsBuilder();
+  }
+
+  public static final class InvoiceUpdateDetailsBuilder {
+
+    private String vatNumber;
+
+    private String vatNumberPrefix;
+
+    private String poNumber;
+
+    private String comment;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private StatementDescriptorParams statementDescriptor;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private InvoiceUpdateDetailsBuilder() {}
+
+    public InvoiceUpdateDetailsBuilder vatNumber(String value) {
+      this.vatNumber = value;
+      return this;
+    }
+
+    public InvoiceUpdateDetailsBuilder vatNumberPrefix(String value) {
+      this.vatNumberPrefix = value;
+      return this;
+    }
+
+    public InvoiceUpdateDetailsBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public InvoiceUpdateDetailsBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceUpdateDetailsBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public InvoiceUpdateDetailsBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public InvoiceUpdateDetailsBuilder statementDescriptor(StatementDescriptorParams value) {
+      this.statementDescriptor = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public InvoiceUpdateDetailsBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public InvoiceUpdateDetailsBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public InvoiceUpdateDetailsParams build() {
+      return new InvoiceUpdateDetailsParams(this);
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatementDescriptorParams {
+
+    private final String descriptor;
+
+    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
+
+      this.descriptor = builder.descriptor;
+    }
+
+    public String getDescriptor() {
+      return descriptor;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.descriptor != null) {
+
+        formData.put("descriptor", this.descriptor);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatementDescriptorParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatementDescriptorBuilder builder() {
+      return new StatementDescriptorBuilder();
+    }
+
+    public static final class StatementDescriptorBuilder {
+
+      private String descriptor;
+
+      private StatementDescriptorBuilder() {}
+
+      public StatementDescriptorBuilder descriptor(String value) {
+        this.descriptor = value;
+        return this;
+      }
+
+      public StatementDescriptorParams build() {
+        return new StatementDescriptorParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceWriteOffParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceWriteOffParams.java
new file mode 100644
index 00000000..caaba092
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoiceWriteOffParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InvoiceWriteOffParams {
+
+  private final String comment;
+
+  private InvoiceWriteOffParams(InvoiceWriteOffBuilder builder) {
+
+    this.comment = builder.comment;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceWriteOffParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceWriteOffBuilder builder() {
+    return new InvoiceWriteOffBuilder();
+  }
+
+  public static final class InvoiceWriteOffBuilder {
+
+    private String comment;
+
+    private InvoiceWriteOffBuilder() {}
+
+    public InvoiceWriteOffBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public InvoiceWriteOffParams build() {
+      return new InvoiceWriteOffParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoicesForCustomerParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoicesForCustomerParams.java
new file mode 100644
index 00000000..12d1908a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoicesForCustomerParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InvoicesForCustomerParams {
+
+  private final Map<String, Object> queryParams;
+
+  private InvoicesForCustomerParams(InvoicesForCustomerBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public InvoicesForCustomerBuilder toBuilder() {
+    InvoicesForCustomerBuilder builder = new InvoicesForCustomerBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for InvoicesForCustomerParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoicesForCustomerBuilder builder() {
+    return new InvoicesForCustomerBuilder();
+  }
+
+  public static final class InvoicesForCustomerBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private InvoicesForCustomerBuilder() {}
+
+    public InvoicesForCustomerBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public InvoicesForCustomerBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public InvoicesForCustomerParams build() {
+      return new InvoicesForCustomerParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/InvoicesForSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/InvoicesForSubscriptionParams.java
new file mode 100644
index 00000000..30e0f744
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/InvoicesForSubscriptionParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InvoicesForSubscriptionParams {
+
+  private final Map<String, Object> queryParams;
+
+  private InvoicesForSubscriptionParams(InvoicesForSubscriptionBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public InvoicesForSubscriptionBuilder toBuilder() {
+    InvoicesForSubscriptionBuilder builder = new InvoicesForSubscriptionBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for InvoicesForSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoicesForSubscriptionBuilder builder() {
+    return new InvoicesForSubscriptionBuilder();
+  }
+
+  public static final class InvoicesForSubscriptionBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private InvoicesForSubscriptionBuilder() {}
+
+    public InvoicesForSubscriptionBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public InvoicesForSubscriptionBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public InvoicesForSubscriptionParams build() {
+      return new InvoicesForSubscriptionParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/ResendEinvoiceParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/ResendEinvoiceParams.java
new file mode 100644
index 00000000..06a68200
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/ResendEinvoiceParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ResendEinvoiceParams {
+
+  private ResendEinvoiceParams(ResendEinvoiceBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for ResendEinvoiceParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ResendEinvoiceBuilder builder() {
+    return new ResendEinvoiceBuilder();
+  }
+
+  public static final class ResendEinvoiceBuilder {
+
+    private ResendEinvoiceBuilder() {}
+
+    public ResendEinvoiceParams build() {
+      return new ResendEinvoiceParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/SendEinvoiceParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/SendEinvoiceParams.java
new file mode 100644
index 00000000..91b74384
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/SendEinvoiceParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class SendEinvoiceParams {
+
+  private SendEinvoiceParams(SendEinvoiceBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for SendEinvoiceParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SendEinvoiceBuilder builder() {
+    return new SendEinvoiceBuilder();
+  }
+
+  public static final class SendEinvoiceBuilder {
+
+    private SendEinvoiceBuilder() {}
+
+    public SendEinvoiceParams build() {
+      return new SendEinvoiceParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/params/VoidInvoiceParams.java b/src/main/java/com/chargebee/v4/models/invoice/params/VoidInvoiceParams.java
new file mode 100644
index 00000000..d6d56462
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/params/VoidInvoiceParams.java
@@ -0,0 +1,80 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.invoice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class VoidInvoiceParams {
+
+  private final String comment;
+
+  private final String voidReasonCode;
+
+  private VoidInvoiceParams(VoidInvoiceBuilder builder) {
+
+    this.comment = builder.comment;
+
+    this.voidReasonCode = builder.voidReasonCode;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public String getVoidReasonCode() {
+    return voidReasonCode;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.voidReasonCode != null) {
+
+      formData.put("void_reason_code", this.voidReasonCode);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for VoidInvoiceParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static VoidInvoiceBuilder builder() {
+    return new VoidInvoiceBuilder();
+  }
+
+  public static final class VoidInvoiceBuilder {
+
+    private String comment;
+
+    private String voidReasonCode;
+
+    private VoidInvoiceBuilder() {}
+
+    public VoidInvoiceBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public VoidInvoiceBuilder voidReasonCode(String value) {
+      this.voidReasonCode = value;
+      return this;
+    }
+
+    public VoidInvoiceParams build() {
+      return new VoidInvoiceParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/responses/DownloadEinvoiceResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/DownloadEinvoiceResponse.java
new file mode 100644
index 00000000..acc145c8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/DownloadEinvoiceResponse.java
@@ -0,0 +1,81 @@
+package com.chargebee.v4.models.invoice.responses;
+
+import com.chargebee.v4.models.download.Download;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import java.util.List;
+
+/**
+ * Immutable response object for DownloadEinvoice operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class DownloadEinvoiceResponse extends BaseResponse {
+  private final List<Download> downloads;
+
+  private DownloadEinvoiceResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.downloads = builder.downloads;
+  }
+
+  /** Parse JSON response into DownloadEinvoiceResponse object. */
+  public static DownloadEinvoiceResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into DownloadEinvoiceResponse object with HTTP response. */
+  public static DownloadEinvoiceResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __downloadsJson = JsonUtil.getArray(json, "downloads");
+      if (__downloadsJson != null) {
+        builder.downloads(
+            JsonUtil.parseObjectArray(__downloadsJson).stream()
+                .map(Download::fromJson)
+                .collect(java.util.stream.Collectors.toList()));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse DownloadEinvoiceResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for DownloadEinvoiceResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for DownloadEinvoiceResponse. */
+  public static class Builder {
+
+    private List<Download> downloads;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder downloads(List<Download> downloads) {
+      this.downloads = downloads;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public DownloadEinvoiceResponse build() {
+      return new DownloadEinvoiceResponse(this);
+    }
+  }
+
+  /** Get the downloads from the response. */
+  public List<Download> getDownloads() {
+    return downloads;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/responses/ImportInvoiceResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/ImportInvoiceResponse.java
new file mode 100644
index 00000000..a3d85984
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/ImportInvoiceResponse.java
@@ -0,0 +1,99 @@
+package com.chargebee.v4.models.invoice.responses;
+
+import com.chargebee.v4.models.invoice.Invoice;
+
+import com.chargebee.v4.models.creditNote.CreditNote;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ImportInvoice operation. Contains the response data from the API.
+ */
+public final class ImportInvoiceResponse extends BaseResponse {
+  private final Invoice invoice;
+
+  private final CreditNote creditNote;
+
+  private ImportInvoiceResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.invoice = builder.invoice;
+
+    this.creditNote = builder.creditNote;
+  }
+
+  /** Parse JSON response into ImportInvoiceResponse object. */
+  public static ImportInvoiceResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ImportInvoiceResponse object with HTTP response. */
+  public static ImportInvoiceResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __invoiceJson = JsonUtil.getObject(json, "invoice");
+      if (__invoiceJson != null) {
+        builder.invoice(Invoice.fromJson(__invoiceJson));
+      }
+
+      String __creditNoteJson = JsonUtil.getObject(json, "credit_note");
+      if (__creditNoteJson != null) {
+        builder.creditNote(CreditNote.fromJson(__creditNoteJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ImportInvoiceResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ImportInvoiceResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ImportInvoiceResponse. */
+  public static class Builder {
+
+    private Invoice invoice;
+
+    private CreditNote creditNote;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder invoice(Invoice invoice) {
+      this.invoice = invoice;
+      return this;
+    }
+
+    public Builder creditNote(CreditNote creditNote) {
+      this.creditNote = creditNote;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ImportInvoiceResponse build() {
+      return new ImportInvoiceResponse(this);
+    }
+  }
+
+  /** Get the invoice from the response. */
+  public Invoice getInvoice() {
+    return invoice;
+  }
+
+  /** Get the creditNote from the response. */
+  public CreditNote getCreditNote() {
+    return creditNote;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceAddAddonChargeResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceAddAddonChargeResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceAddAddonChargeResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceAddAddonChargeResponse.java
index 52f05229..e512c968 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceAddAddonChargeResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceAddAddonChargeResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceAddChargeItemResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceAddChargeItemResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceAddChargeItemResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceAddChargeItemResponse.java
index d41591af..cdee9f9b 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceAddChargeItemResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceAddChargeItemResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceAddChargeResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceAddChargeResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceAddChargeResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceAddChargeResponse.java
index cc4b9bd5..ef11a95a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceAddChargeResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceAddChargeResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceApplyCreditsResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceApplyCreditsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceApplyCreditsResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceApplyCreditsResponse.java
index a550e2ce..5eab90c5 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceApplyCreditsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceApplyCreditsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceApplyPaymentScheduleSchemeResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceApplyPaymentScheduleSchemeResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceApplyPaymentScheduleSchemeResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceApplyPaymentScheduleSchemeResponse.java
index a7b944ee..b1dcfcd3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceApplyPaymentScheduleSchemeResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceApplyPaymentScheduleSchemeResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceApplyPaymentsResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceApplyPaymentsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceApplyPaymentsResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceApplyPaymentsResponse.java
index 02262968..010d8125 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceApplyPaymentsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceApplyPaymentsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceChargeAddonResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceChargeAddonResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceChargeAddonResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceChargeAddonResponse.java
index c02a032f..7cae179a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceChargeAddonResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceChargeAddonResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceChargeResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceChargeResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceChargeResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceChargeResponse.java
index bd472072..3e6d55d1 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceChargeResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceChargeResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCloseResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCloseResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCloseResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCloseResponse.java
index bebed6c7..f6ccbbda 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCloseResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCloseResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCollectPaymentResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCollectPaymentResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCollectPaymentResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCollectPaymentResponse.java
index acdfe45c..114d6c9a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCollectPaymentResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCollectPaymentResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCreateForChargeItemResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCreateForChargeItemResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCreateForChargeItemResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCreateForChargeItemResponse.java
index d0f5eccf..ea5a2628 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCreateForChargeItemResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCreateForChargeItemResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCreateForChargeItemsAndChargesResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCreateForChargeItemsAndChargesResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCreateForChargeItemsAndChargesResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCreateForChargeItemsAndChargesResponse.java
index 5e61034a..7aab9f08 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCreateForChargeItemsAndChargesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCreateForChargeItemsAndChargesResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCreateResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCreateResponse.java
index ffb5b366..b50bd67f 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceDeleteImportedResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceDeleteImportedResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceDeleteImportedResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceDeleteImportedResponse.java
index 978e8e1a..aafd8ad2 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceDeleteImportedResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceDeleteImportedResponse.java
@@ -1,12 +1,12 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceDeleteLineItemsResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceDeleteLineItemsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceDeleteLineItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceDeleteLineItemsResponse.java
index 6780659e..2e5baeb0 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceDeleteLineItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceDeleteLineItemsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceDeleteResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceDeleteResponse.java
index 10c18a6e..2c519836 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceListPaymentReferenceNumbersResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceListPaymentReferenceNumbersResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceListPaymentReferenceNumbersResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceListPaymentReferenceNumbersResponse.java
index f88ec67d..13ca552e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceListPaymentReferenceNumbersResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceListPaymentReferenceNumbersResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.paymentReferenceNumber.PaymentReferenceNumber;
+import com.chargebee.v4.models.paymentReferenceNumber.PaymentReferenceNumber;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.InvoiceService;
-import com.chargebee.v4.core.models.invoice.params.InvoiceListPaymentReferenceNumbersParams;
+import com.chargebee.v4.services.InvoiceService;
+import com.chargebee.v4.models.invoice.params.InvoiceListPaymentReferenceNumbersParams;
 
 /**
  * Immutable response object for InvoiceListPaymentReferenceNumbers operation. Contains paginated
@@ -104,9 +105,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public InvoiceListPaymentReferenceNumbersResponse nextPage() throws Exception {
+  public InvoiceListPaymentReferenceNumbersResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceListResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceListResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceListResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceListResponse.java
index 937c1324..c120ae37 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.InvoiceService;
-import com.chargebee.v4.core.models.invoice.params.InvoiceListParams;
+import com.chargebee.v4.services.InvoiceService;
+import com.chargebee.v4.models.invoice.params.InvoiceListParams;
 
 /** Immutable response object for InvoiceList operation. Contains paginated list data. */
 public final class InvoiceListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public InvoiceListResponse nextPage() throws Exception {
+  public InvoiceListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoicePauseDunningResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoicePauseDunningResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoicePauseDunningResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoicePauseDunningResponse.java
index fa06b335..5b25d7cc 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoicePauseDunningResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoicePauseDunningResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/invoice/responses/InvoicePaymentSchedulesResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoicePaymentSchedulesResponse.java
new file mode 100644
index 00000000..c71a76da
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoicePaymentSchedulesResponse.java
@@ -0,0 +1,81 @@
+package com.chargebee.v4.models.invoice.responses;
+
+import com.chargebee.v4.models.paymentSchedule.PaymentSchedule;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import java.util.List;
+
+/**
+ * Immutable response object for InvoicePaymentSchedules operation. Contains the response data from
+ * a single resource get operation.
+ */
+public final class InvoicePaymentSchedulesResponse extends BaseResponse {
+  private final List<PaymentSchedule> paymentSchedules;
+
+  private InvoicePaymentSchedulesResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.paymentSchedules = builder.paymentSchedules;
+  }
+
+  /** Parse JSON response into InvoicePaymentSchedulesResponse object. */
+  public static InvoicePaymentSchedulesResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into InvoicePaymentSchedulesResponse object with HTTP response. */
+  public static InvoicePaymentSchedulesResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __paymentSchedulesJson = JsonUtil.getArray(json, "payment_schedules");
+      if (__paymentSchedulesJson != null) {
+        builder.paymentSchedules(
+            JsonUtil.parseObjectArray(__paymentSchedulesJson).stream()
+                .map(PaymentSchedule::fromJson)
+                .collect(java.util.stream.Collectors.toList()));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse InvoicePaymentSchedulesResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for InvoicePaymentSchedulesResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for InvoicePaymentSchedulesResponse. */
+  public static class Builder {
+
+    private List<PaymentSchedule> paymentSchedules;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder paymentSchedules(List<PaymentSchedule> paymentSchedules) {
+      this.paymentSchedules = paymentSchedules;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public InvoicePaymentSchedulesResponse build() {
+      return new InvoicePaymentSchedulesResponse(this);
+    }
+  }
+
+  /** Get the paymentSchedules from the response. */
+  public List<PaymentSchedule> getPaymentSchedules() {
+    return paymentSchedules;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoicePdfResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoicePdfResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoicePdfResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoicePdfResponse.java
index db22961c..5deded68 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoicePdfResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoicePdfResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.download.Download;
+import com.chargebee.v4.models.download.Download;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRecordPaymentResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRecordPaymentResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRecordPaymentResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRecordPaymentResponse.java
index 30d36268..a6560612 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRecordPaymentResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRecordPaymentResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRecordRefundResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRecordRefundResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRecordRefundResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRecordRefundResponse.java
index 02c13bac..6d399e10 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRecordRefundResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRecordRefundResponse.java
@@ -1,12 +1,12 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRecordTaxWithheldResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRecordTaxWithheldResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRecordTaxWithheldResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRecordTaxWithheldResponse.java
index 2b12ba8c..361434d0 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRecordTaxWithheldResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRecordTaxWithheldResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRefundResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRefundResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRefundResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRefundResponse.java
index 7c6b089f..900c4327 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRefundResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRefundResponse.java
@@ -1,12 +1,12 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRemoveCreditNoteResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRemoveCreditNoteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRemoveCreditNoteResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRemoveCreditNoteResponse.java
index 3ff37c3d..fd5e6072 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRemoveCreditNoteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRemoveCreditNoteResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRemovePaymentResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRemovePaymentResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRemovePaymentResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRemovePaymentResponse.java
index 37c3b53d..8a6c796f 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRemovePaymentResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRemovePaymentResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRemoveTaxWithheldResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRemoveTaxWithheldResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRemoveTaxWithheldResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRemoveTaxWithheldResponse.java
index 82a695f4..f8a79a9c 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceRemoveTaxWithheldResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRemoveTaxWithheldResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceResumeDunningResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceResumeDunningResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceResumeDunningResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceResumeDunningResponse.java
index f77ca850..47038645 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceResumeDunningResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceResumeDunningResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRetrieveResponse.java
new file mode 100644
index 00000000..fe17fd4b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.invoice.responses;
+
+import com.chargebee.v4.models.invoice.Invoice;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for InvoiceRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class InvoiceRetrieveResponse extends BaseResponse {
+  private final Invoice invoice;
+
+  private InvoiceRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.invoice = builder.invoice;
+  }
+
+  /** Parse JSON response into InvoiceRetrieveResponse object. */
+  public static InvoiceRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into InvoiceRetrieveResponse object with HTTP response. */
+  public static InvoiceRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __invoiceJson = JsonUtil.getObject(json, "invoice");
+      if (__invoiceJson != null) {
+        builder.invoice(Invoice.fromJson(__invoiceJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse InvoiceRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for InvoiceRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for InvoiceRetrieveResponse. */
+  public static class Builder {
+
+    private Invoice invoice;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder invoice(Invoice invoice) {
+      this.invoice = invoice;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public InvoiceRetrieveResponse build() {
+      return new InvoiceRetrieveResponse(this);
+    }
+  }
+
+  /** Get the invoice from the response. */
+  public Invoice getInvoice() {
+    return invoice;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceStopDunningResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceStopDunningResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceStopDunningResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceStopDunningResponse.java
index ac7ad963..6d601424 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceStopDunningResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceStopDunningResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceSyncUsagesResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceSyncUsagesResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceSyncUsagesResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceSyncUsagesResponse.java
index 86f07f14..8b6e02f3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceSyncUsagesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceSyncUsagesResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceUpdateDetailsResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceUpdateDetailsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceUpdateDetailsResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceUpdateDetailsResponse.java
index ae72d0bd..2ff71b0a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceUpdateDetailsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceUpdateDetailsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceWriteOffResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceWriteOffResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceWriteOffResponse.java
rename to src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceWriteOffResponse.java
index 674ce84d..e5fa9cd6 100644
--- a/src/main/java/com/chargebee/v4/core/responses/invoice/InvoiceWriteOffResponse.java
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoiceWriteOffResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.invoice;
+package com.chargebee.v4.models.invoice.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/invoice/responses/InvoicesForCustomerResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoicesForCustomerResponse.java
new file mode 100644
index 00000000..27e7aaef
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoicesForCustomerResponse.java
@@ -0,0 +1,172 @@
+package com.chargebee.v4.models.invoice.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.invoice.Invoice;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.InvoiceService;
+import com.chargebee.v4.models.invoice.params.InvoicesForCustomerParams;
+
+/** Immutable response object for InvoicesForCustomer operation. Contains paginated list data. */
+public final class InvoicesForCustomerResponse {
+
+  private final List<InvoiceInvoicesForCustomerItem> list;
+
+  private final String nextOffset;
+
+  private final String customerId;
+
+  private final InvoiceService service;
+  private final InvoicesForCustomerParams originalParams;
+  private final Response httpResponse;
+
+  private InvoicesForCustomerResponse(
+      List<InvoiceInvoicesForCustomerItem> list,
+      String nextOffset,
+      String customerId,
+      InvoiceService service,
+      InvoicesForCustomerParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.customerId = customerId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into InvoicesForCustomerResponse object (no service context). Use this when
+   * you only need to read a single page (no nextPage()).
+   */
+  public static InvoicesForCustomerResponse fromJson(String json) {
+    try {
+
+      List<InvoiceInvoicesForCustomerItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(InvoiceInvoicesForCustomerItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new InvoicesForCustomerResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse InvoicesForCustomerResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into InvoicesForCustomerResponse object with service context for pagination
+   * (enables nextPage()).
+   */
+  public static InvoicesForCustomerResponse fromJson(
+      String json,
+      InvoiceService service,
+      InvoicesForCustomerParams originalParams,
+      String customerId,
+      Response httpResponse) {
+    try {
+
+      List<InvoiceInvoicesForCustomerItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(InvoiceInvoicesForCustomerItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new InvoicesForCustomerResponse(
+          list, nextOffset, customerId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse InvoicesForCustomerResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<InvoiceInvoicesForCustomerItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public InvoicesForCustomerResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    InvoicesForCustomerParams nextParams =
+        (originalParams != null ? originalParams.toBuilder() : InvoicesForCustomerParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.invoicesForCustomer(customerId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class InvoiceInvoicesForCustomerItem {
+
+    private Invoice invoice;
+
+    public Invoice getInvoice() {
+      return invoice;
+    }
+
+    public static InvoiceInvoicesForCustomerItem fromJson(String json) {
+      InvoiceInvoicesForCustomerItem item = new InvoiceInvoicesForCustomerItem();
+
+      String __invoiceJson = JsonUtil.getObject(json, "invoice");
+      if (__invoiceJson != null) {
+        item.invoice = Invoice.fromJson(__invoiceJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/responses/InvoicesForSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoicesForSubscriptionResponse.java
new file mode 100644
index 00000000..65a04cd3
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/InvoicesForSubscriptionResponse.java
@@ -0,0 +1,176 @@
+package com.chargebee.v4.models.invoice.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.invoice.Invoice;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.InvoiceService;
+import com.chargebee.v4.models.invoice.params.InvoicesForSubscriptionParams;
+
+/**
+ * Immutable response object for InvoicesForSubscription operation. Contains paginated list data.
+ */
+public final class InvoicesForSubscriptionResponse {
+
+  private final List<InvoiceInvoicesForSubscriptionItem> list;
+
+  private final String nextOffset;
+
+  private final String subscriptionId;
+
+  private final InvoiceService service;
+  private final InvoicesForSubscriptionParams originalParams;
+  private final Response httpResponse;
+
+  private InvoicesForSubscriptionResponse(
+      List<InvoiceInvoicesForSubscriptionItem> list,
+      String nextOffset,
+      String subscriptionId,
+      InvoiceService service,
+      InvoicesForSubscriptionParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.subscriptionId = subscriptionId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into InvoicesForSubscriptionResponse object (no service context). Use this
+   * when you only need to read a single page (no nextPage()).
+   */
+  public static InvoicesForSubscriptionResponse fromJson(String json) {
+    try {
+
+      List<InvoiceInvoicesForSubscriptionItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(InvoiceInvoicesForSubscriptionItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new InvoicesForSubscriptionResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse InvoicesForSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into InvoicesForSubscriptionResponse object with service context for
+   * pagination (enables nextPage()).
+   */
+  public static InvoicesForSubscriptionResponse fromJson(
+      String json,
+      InvoiceService service,
+      InvoicesForSubscriptionParams originalParams,
+      String subscriptionId,
+      Response httpResponse) {
+    try {
+
+      List<InvoiceInvoicesForSubscriptionItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(InvoiceInvoicesForSubscriptionItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new InvoicesForSubscriptionResponse(
+          list, nextOffset, subscriptionId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse InvoicesForSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<InvoiceInvoicesForSubscriptionItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public InvoicesForSubscriptionResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    InvoicesForSubscriptionParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : InvoicesForSubscriptionParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.invoicesForSubscription(subscriptionId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class InvoiceInvoicesForSubscriptionItem {
+
+    private Invoice invoice;
+
+    public Invoice getInvoice() {
+      return invoice;
+    }
+
+    public static InvoiceInvoicesForSubscriptionItem fromJson(String json) {
+      InvoiceInvoicesForSubscriptionItem item = new InvoiceInvoicesForSubscriptionItem();
+
+      String __invoiceJson = JsonUtil.getObject(json, "invoice");
+      if (__invoiceJson != null) {
+        item.invoice = Invoice.fromJson(__invoiceJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/responses/ResendEinvoiceResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/ResendEinvoiceResponse.java
new file mode 100644
index 00000000..289919e0
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/ResendEinvoiceResponse.java
@@ -0,0 +1,76 @@
+package com.chargebee.v4.models.invoice.responses;
+
+import com.chargebee.v4.models.invoice.Invoice;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ResendEinvoice operation. Contains the response data from the API.
+ */
+public final class ResendEinvoiceResponse extends BaseResponse {
+  private final Invoice invoice;
+
+  private ResendEinvoiceResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.invoice = builder.invoice;
+  }
+
+  /** Parse JSON response into ResendEinvoiceResponse object. */
+  public static ResendEinvoiceResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ResendEinvoiceResponse object with HTTP response. */
+  public static ResendEinvoiceResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __invoiceJson = JsonUtil.getObject(json, "invoice");
+      if (__invoiceJson != null) {
+        builder.invoice(Invoice.fromJson(__invoiceJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ResendEinvoiceResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ResendEinvoiceResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ResendEinvoiceResponse. */
+  public static class Builder {
+
+    private Invoice invoice;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder invoice(Invoice invoice) {
+      this.invoice = invoice;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ResendEinvoiceResponse build() {
+      return new ResendEinvoiceResponse(this);
+    }
+  }
+
+  /** Get the invoice from the response. */
+  public Invoice getInvoice() {
+    return invoice;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/responses/SendEinvoiceResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/SendEinvoiceResponse.java
new file mode 100644
index 00000000..edc1af50
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/SendEinvoiceResponse.java
@@ -0,0 +1,76 @@
+package com.chargebee.v4.models.invoice.responses;
+
+import com.chargebee.v4.models.invoice.Invoice;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for SendEinvoice operation. Contains the response data from the API.
+ */
+public final class SendEinvoiceResponse extends BaseResponse {
+  private final Invoice invoice;
+
+  private SendEinvoiceResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.invoice = builder.invoice;
+  }
+
+  /** Parse JSON response into SendEinvoiceResponse object. */
+  public static SendEinvoiceResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into SendEinvoiceResponse object with HTTP response. */
+  public static SendEinvoiceResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __invoiceJson = JsonUtil.getObject(json, "invoice");
+      if (__invoiceJson != null) {
+        builder.invoice(Invoice.fromJson(__invoiceJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse SendEinvoiceResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for SendEinvoiceResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for SendEinvoiceResponse. */
+  public static class Builder {
+
+    private Invoice invoice;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder invoice(Invoice invoice) {
+      this.invoice = invoice;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public SendEinvoiceResponse build() {
+      return new SendEinvoiceResponse(this);
+    }
+  }
+
+  /** Get the invoice from the response. */
+  public Invoice getInvoice() {
+    return invoice;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/invoice/responses/VoidInvoiceResponse.java b/src/main/java/com/chargebee/v4/models/invoice/responses/VoidInvoiceResponse.java
new file mode 100644
index 00000000..7c4175bd
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/invoice/responses/VoidInvoiceResponse.java
@@ -0,0 +1,97 @@
+package com.chargebee.v4.models.invoice.responses;
+
+import com.chargebee.v4.models.invoice.Invoice;
+
+import com.chargebee.v4.models.creditNote.CreditNote;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/** Immutable response object for VoidInvoice operation. Contains the response data from the API. */
+public final class VoidInvoiceResponse extends BaseResponse {
+  private final Invoice invoice;
+
+  private final CreditNote creditNote;
+
+  private VoidInvoiceResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.invoice = builder.invoice;
+
+    this.creditNote = builder.creditNote;
+  }
+
+  /** Parse JSON response into VoidInvoiceResponse object. */
+  public static VoidInvoiceResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into VoidInvoiceResponse object with HTTP response. */
+  public static VoidInvoiceResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __invoiceJson = JsonUtil.getObject(json, "invoice");
+      if (__invoiceJson != null) {
+        builder.invoice(Invoice.fromJson(__invoiceJson));
+      }
+
+      String __creditNoteJson = JsonUtil.getObject(json, "credit_note");
+      if (__creditNoteJson != null) {
+        builder.creditNote(CreditNote.fromJson(__creditNoteJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse VoidInvoiceResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for VoidInvoiceResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for VoidInvoiceResponse. */
+  public static class Builder {
+
+    private Invoice invoice;
+
+    private CreditNote creditNote;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder invoice(Invoice invoice) {
+      this.invoice = invoice;
+      return this;
+    }
+
+    public Builder creditNote(CreditNote creditNote) {
+      this.creditNote = creditNote;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public VoidInvoiceResponse build() {
+      return new VoidInvoiceResponse(this);
+    }
+  }
+
+  /** Get the invoice from the response. */
+  public Invoice getInvoice() {
+    return invoice;
+  }
+
+  /** Get the creditNote from the response. */
+  public CreditNote getCreditNote() {
+    return creditNote;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/invoiceEstimate/InvoiceEstimate.java b/src/main/java/com/chargebee/v4/models/invoiceEstimate/InvoiceEstimate.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/invoiceEstimate/InvoiceEstimate.java
rename to src/main/java/com/chargebee/v4/models/invoiceEstimate/InvoiceEstimate.java
index 106cadc7..d5c22c12 100644
--- a/src/main/java/com/chargebee/v4/core/models/invoiceEstimate/InvoiceEstimate.java
+++ b/src/main/java/com/chargebee/v4/models/invoiceEstimate/InvoiceEstimate.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.invoiceEstimate;
+package com.chargebee.v4.models.invoiceEstimate;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.math.BigDecimal;
@@ -1037,6 +1037,7 @@ public static class Discounts {
 
     private Long amount;
     private String description;
+    private String lineItemId;
     private EntityType entityType;
     private DiscountType discountType;
     private String entityId;
@@ -1050,6 +1051,10 @@ public String getDescription() {
       return description;
     }
 
+    public String getLineItemId() {
+      return lineItemId;
+    }
+
     public EntityType getEntityType() {
       return entityType;
     }
@@ -1137,6 +1142,8 @@ public static Discounts fromJson(String json) {
 
       obj.description = JsonUtil.getString(json, "description");
 
+      obj.lineItemId = JsonUtil.getString(json, "line_item_id");
+
       obj.entityType = EntityType.fromString(JsonUtil.getString(json, "entity_type"));
 
       obj.discountType = DiscountType.fromString(JsonUtil.getString(json, "discount_type"));
diff --git a/src/main/java/com/chargebee/v4/core/models/item/Item.java b/src/main/java/com/chargebee/v4/models/item/Item.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/item/Item.java
rename to src/main/java/com/chargebee/v4/models/item/Item.java
index 3ceb036a..754c11d4 100644
--- a/src/main/java/com/chargebee/v4/core/models/item/Item.java
+++ b/src/main/java/com/chargebee/v4/models/item/Item.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.item;
+package com.chargebee.v4.models.item;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.math.BigDecimal;
@@ -44,7 +44,7 @@ public class Item {
   private List<BundleItems> bundleItems;
   private BundleConfiguration bundleConfiguration;
 
-  private java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+  private java.util.Map<String, String> customFields = new java.util.HashMap<>();
 
   public String getId() {
     return id;
@@ -168,7 +168,7 @@ public BundleConfiguration getBundleConfiguration() {
    *
    * @return map containing all custom fields
    */
-  public java.util.Map<String, Object> getCustomFields() {
+  public java.util.Map<String, String> getCustomFields() {
     return customFields;
   }
 
@@ -178,7 +178,7 @@ public java.util.Map<String, Object> getCustomFields() {
    * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
    * @return the value of the custom field, or null if not present
    */
-  public Object getCustomField(String fieldName) {
+  public String getCustomField(String fieldName) {
     return customFields.get(fieldName);
   }
 
@@ -333,7 +333,7 @@ public static Channel fromString(String value) {
   public static Item fromJson(String json) {
     Item obj = new Item();
 
-    // Parse JSON to extract all keys
+    // Parse JSON to extract all keys for custom field extraction
     java.util.Set<String> knownFields = new java.util.HashSet<>();
 
     knownFields.add("id");
@@ -481,9 +481,9 @@ public static Item fromJson(String json) {
    * @param knownFields set of known field names
    * @return map of custom fields
    */
-  private static java.util.Map<String, Object> extractCustomFields(
+  private static java.util.Map<String, String> extractCustomFields(
       String json, java.util.Set<String> knownFields) {
-    java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+    java.util.Map<String, String> customFields = new java.util.HashMap<>();
     try {
       // Parse the entire JSON as a map
       java.util.Map<String, Object> allFields = JsonUtil.parseJsonObjectToMap(json);
@@ -492,7 +492,8 @@ private static java.util.Map<String, Object> extractCustomFields(
           String key = entry.getKey();
           // Include fields that start with "cf_" and are not in knownFields
           if (key != null && key.startsWith("cf_") && !knownFields.contains(key)) {
-            customFields.put(key, entry.getValue());
+            customFields.put(
+                key, entry.getValue() != null ? String.valueOf(entry.getValue()) : null);
           }
         }
       }
diff --git a/src/main/java/com/chargebee/v4/models/item/params/ItemCreateParams.java b/src/main/java/com/chargebee/v4/models/item/params/ItemCreateParams.java
new file mode 100644
index 00000000..3a5f0eb4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/item/params/ItemCreateParams.java
@@ -0,0 +1,870 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.item.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.math.BigDecimal;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class ItemCreateParams {
+
+  private final String id;
+
+  private final String name;
+
+  private final Type type;
+
+  private final String description;
+
+  private final String itemFamilyId;
+
+  private final Boolean isGiftable;
+
+  private final Boolean isShippable;
+
+  private final String externalName;
+
+  private final Boolean enabledInPortal;
+
+  private final String redirectUrl;
+
+  private final Boolean enabledForCheckout;
+
+  private final ItemApplicability itemApplicability;
+
+  private final List<String> applicableItems;
+
+  private final String unit;
+
+  private final String giftClaimRedirectUrl;
+
+  private final Boolean includedInMrr;
+
+  private final Boolean metered;
+
+  private final UsageCalculation usageCalculation;
+
+  private final Boolean isPercentagePricing;
+
+  private final java.util.Map<String, Object> metadata;
+
+  private final String businessEntityId;
+
+  private final BundleConfigurationParams bundleConfiguration;
+
+  private final List<BundleItemsToAddParams> bundleItemsToAdd;
+
+  private final Map<String, String> customFields;
+
+  private ItemCreateParams(ItemCreateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.name = builder.name;
+
+    this.type = builder.type;
+
+    this.description = builder.description;
+
+    this.itemFamilyId = builder.itemFamilyId;
+
+    this.isGiftable = builder.isGiftable;
+
+    this.isShippable = builder.isShippable;
+
+    this.externalName = builder.externalName;
+
+    this.enabledInPortal = builder.enabledInPortal;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.enabledForCheckout = builder.enabledForCheckout;
+
+    this.itemApplicability = builder.itemApplicability;
+
+    this.applicableItems = builder.applicableItems;
+
+    this.unit = builder.unit;
+
+    this.giftClaimRedirectUrl = builder.giftClaimRedirectUrl;
+
+    this.includedInMrr = builder.includedInMrr;
+
+    this.metered = builder.metered;
+
+    this.usageCalculation = builder.usageCalculation;
+
+    this.isPercentagePricing = builder.isPercentagePricing;
+
+    this.metadata = builder.metadata;
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.bundleConfiguration = builder.bundleConfiguration;
+
+    this.bundleItemsToAdd = builder.bundleItemsToAdd;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public Type getType() {
+    return type;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public String getItemFamilyId() {
+    return itemFamilyId;
+  }
+
+  public Boolean getIsGiftable() {
+    return isGiftable;
+  }
+
+  public Boolean getIsShippable() {
+    return isShippable;
+  }
+
+  public String getExternalName() {
+    return externalName;
+  }
+
+  public Boolean getEnabledInPortal() {
+    return enabledInPortal;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public Boolean getEnabledForCheckout() {
+    return enabledForCheckout;
+  }
+
+  public ItemApplicability getItemApplicability() {
+    return itemApplicability;
+  }
+
+  public List<String> getApplicableItems() {
+    return applicableItems;
+  }
+
+  public String getUnit() {
+    return unit;
+  }
+
+  public String getGiftClaimRedirectUrl() {
+    return giftClaimRedirectUrl;
+  }
+
+  public Boolean getIncludedInMrr() {
+    return includedInMrr;
+  }
+
+  public Boolean getMetered() {
+    return metered;
+  }
+
+  public UsageCalculation getUsageCalculation() {
+    return usageCalculation;
+  }
+
+  public Boolean getIsPercentagePricing() {
+    return isPercentagePricing;
+  }
+
+  public java.util.Map<String, Object> getMetadata() {
+    return metadata;
+  }
+
+  public String getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public BundleConfigurationParams getBundleConfiguration() {
+    return bundleConfiguration;
+  }
+
+  public List<BundleItemsToAddParams> getBundleItemsToAdd() {
+    return bundleItemsToAdd;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.type != null) {
+
+      formData.put("type", this.type);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.itemFamilyId != null) {
+
+      formData.put("item_family_id", this.itemFamilyId);
+    }
+
+    if (this.isGiftable != null) {
+
+      formData.put("is_giftable", this.isGiftable);
+    }
+
+    if (this.isShippable != null) {
+
+      formData.put("is_shippable", this.isShippable);
+    }
+
+    if (this.externalName != null) {
+
+      formData.put("external_name", this.externalName);
+    }
+
+    if (this.enabledInPortal != null) {
+
+      formData.put("enabled_in_portal", this.enabledInPortal);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.enabledForCheckout != null) {
+
+      formData.put("enabled_for_checkout", this.enabledForCheckout);
+    }
+
+    if (this.itemApplicability != null) {
+
+      formData.put("item_applicability", this.itemApplicability);
+    }
+
+    if (this.applicableItems != null) {
+
+      formData.put("applicable_items", this.applicableItems);
+    }
+
+    if (this.unit != null) {
+
+      formData.put("unit", this.unit);
+    }
+
+    if (this.giftClaimRedirectUrl != null) {
+
+      formData.put("gift_claim_redirect_url", this.giftClaimRedirectUrl);
+    }
+
+    if (this.includedInMrr != null) {
+
+      formData.put("included_in_mrr", this.includedInMrr);
+    }
+
+    if (this.metered != null) {
+
+      formData.put("metered", this.metered);
+    }
+
+    if (this.usageCalculation != null) {
+
+      formData.put("usage_calculation", this.usageCalculation);
+    }
+
+    if (this.isPercentagePricing != null) {
+
+      formData.put("is_percentage_pricing", this.isPercentagePricing);
+    }
+
+    if (this.metadata != null) {
+
+      formData.put("metadata", JsonUtil.toJson(this.metadata));
+    }
+
+    if (this.businessEntityId != null) {
+
+      formData.put("business_entity_id", this.businessEntityId);
+    }
+
+    if (this.bundleConfiguration != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.bundleConfiguration.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "bundle_configuration[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.bundleItemsToAdd != null) {
+
+      // List of objects
+      for (int i = 0; i < this.bundleItemsToAdd.size(); i++) {
+        BundleItemsToAddParams item = this.bundleItemsToAdd.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "bundle_items_to_add[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for ItemCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ItemCreateBuilder builder() {
+    return new ItemCreateBuilder();
+  }
+
+  public static final class ItemCreateBuilder {
+
+    private String id;
+
+    private String name;
+
+    private Type type;
+
+    private String description;
+
+    private String itemFamilyId;
+
+    private Boolean isGiftable;
+
+    private Boolean isShippable;
+
+    private String externalName;
+
+    private Boolean enabledInPortal;
+
+    private String redirectUrl;
+
+    private Boolean enabledForCheckout;
+
+    private ItemApplicability itemApplicability;
+
+    private List<String> applicableItems;
+
+    private String unit;
+
+    private String giftClaimRedirectUrl;
+
+    private Boolean includedInMrr;
+
+    private Boolean metered;
+
+    private UsageCalculation usageCalculation;
+
+    private Boolean isPercentagePricing;
+
+    private java.util.Map<String, Object> metadata;
+
+    private String businessEntityId;
+
+    private BundleConfigurationParams bundleConfiguration;
+
+    private List<BundleItemsToAddParams> bundleItemsToAdd;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private ItemCreateBuilder() {}
+
+    public ItemCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public ItemCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public ItemCreateBuilder type(Type value) {
+      this.type = value;
+      return this;
+    }
+
+    public ItemCreateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public ItemCreateBuilder itemFamilyId(String value) {
+      this.itemFamilyId = value;
+      return this;
+    }
+
+    public ItemCreateBuilder isGiftable(Boolean value) {
+      this.isGiftable = value;
+      return this;
+    }
+
+    public ItemCreateBuilder isShippable(Boolean value) {
+      this.isShippable = value;
+      return this;
+    }
+
+    public ItemCreateBuilder externalName(String value) {
+      this.externalName = value;
+      return this;
+    }
+
+    public ItemCreateBuilder enabledInPortal(Boolean value) {
+      this.enabledInPortal = value;
+      return this;
+    }
+
+    public ItemCreateBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public ItemCreateBuilder enabledForCheckout(Boolean value) {
+      this.enabledForCheckout = value;
+      return this;
+    }
+
+    public ItemCreateBuilder itemApplicability(ItemApplicability value) {
+      this.itemApplicability = value;
+      return this;
+    }
+
+    public ItemCreateBuilder applicableItems(List<String> value) {
+      this.applicableItems = value;
+      return this;
+    }
+
+    public ItemCreateBuilder unit(String value) {
+      this.unit = value;
+      return this;
+    }
+
+    public ItemCreateBuilder giftClaimRedirectUrl(String value) {
+      this.giftClaimRedirectUrl = value;
+      return this;
+    }
+
+    public ItemCreateBuilder includedInMrr(Boolean value) {
+      this.includedInMrr = value;
+      return this;
+    }
+
+    public ItemCreateBuilder metered(Boolean value) {
+      this.metered = value;
+      return this;
+    }
+
+    public ItemCreateBuilder usageCalculation(UsageCalculation value) {
+      this.usageCalculation = value;
+      return this;
+    }
+
+    public ItemCreateBuilder isPercentagePricing(Boolean value) {
+      this.isPercentagePricing = value;
+      return this;
+    }
+
+    public ItemCreateBuilder metadata(java.util.Map<String, Object> value) {
+      this.metadata = value;
+      return this;
+    }
+
+    public ItemCreateBuilder businessEntityId(String value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public ItemCreateBuilder bundleConfiguration(BundleConfigurationParams value) {
+      this.bundleConfiguration = value;
+      return this;
+    }
+
+    public ItemCreateBuilder bundleItemsToAdd(List<BundleItemsToAddParams> value) {
+      this.bundleItemsToAdd = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public ItemCreateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public ItemCreateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public ItemCreateParams build() {
+      return new ItemCreateParams(this);
+    }
+  }
+
+  public enum Type {
+    PLAN("plan"),
+
+    ADDON("addon"),
+
+    CHARGE("charge"),
+
+    /** An enum member indicating that Type was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Type(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Type fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Type enumValue : Type.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ItemApplicability {
+    ALL("all"),
+
+    RESTRICTED("restricted"),
+
+    /** An enum member indicating that ItemApplicability was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ItemApplicability(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ItemApplicability fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ItemApplicability enumValue : ItemApplicability.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum UsageCalculation {
+    SUM_OF_USAGES("sum_of_usages"),
+
+    LAST_USAGE("last_usage"),
+
+    MAX_USAGE("max_usage"),
+
+    /** An enum member indicating that UsageCalculation was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    UsageCalculation(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static UsageCalculation fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (UsageCalculation enumValue : UsageCalculation.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class BundleConfigurationParams {
+
+    private final Type type;
+
+    private BundleConfigurationParams(BundleConfigurationBuilder builder) {
+
+      this.type = builder.type;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BundleConfigurationParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BundleConfigurationBuilder builder() {
+      return new BundleConfigurationBuilder();
+    }
+
+    public static final class BundleConfigurationBuilder {
+
+      private Type type;
+
+      private BundleConfigurationBuilder() {}
+
+      public BundleConfigurationBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      public BundleConfigurationParams build() {
+        return new BundleConfigurationParams(this);
+      }
+    }
+
+    public enum Type {
+      FIXED("fixed"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BundleItemsToAddParams {
+
+    private final String itemId;
+
+    private final ItemType itemType;
+
+    private final Integer quantity;
+
+    private final BigDecimal priceAllocation;
+
+    private BundleItemsToAddParams(BundleItemsToAddBuilder builder) {
+
+      this.itemId = builder.itemId;
+
+      this.itemType = builder.itemType;
+
+      this.quantity = builder.quantity;
+
+      this.priceAllocation = builder.priceAllocation;
+    }
+
+    public String getItemId() {
+      return itemId;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public BigDecimal getPriceAllocation() {
+      return priceAllocation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemId != null) {
+
+        formData.put("item_id", this.itemId);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.priceAllocation != null) {
+
+        formData.put("price_allocation", this.priceAllocation);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BundleItemsToAddParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BundleItemsToAddBuilder builder() {
+      return new BundleItemsToAddBuilder();
+    }
+
+    public static final class BundleItemsToAddBuilder {
+
+      private String itemId;
+
+      private ItemType itemType;
+
+      private Integer quantity;
+
+      private BigDecimal priceAllocation;
+
+      private BundleItemsToAddBuilder() {}
+
+      public BundleItemsToAddBuilder itemId(String value) {
+        this.itemId = value;
+        return this;
+      }
+
+      public BundleItemsToAddBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public BundleItemsToAddBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public BundleItemsToAddBuilder priceAllocation(BigDecimal value) {
+        this.priceAllocation = value;
+        return this;
+      }
+
+      public BundleItemsToAddParams build() {
+        return new BundleItemsToAddParams(this);
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/item/params/ItemDeleteParams.java b/src/main/java/com/chargebee/v4/models/item/params/ItemDeleteParams.java
new file mode 100644
index 00000000..42b38f3c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/item/params/ItemDeleteParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.item.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ItemDeleteParams {
+
+  private ItemDeleteParams(ItemDeleteBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for ItemDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ItemDeleteBuilder builder() {
+    return new ItemDeleteBuilder();
+  }
+
+  public static final class ItemDeleteBuilder {
+
+    private ItemDeleteBuilder() {}
+
+    public ItemDeleteParams build() {
+      return new ItemDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/item/params/ItemListParams.java b/src/main/java/com/chargebee/v4/models/item/params/ItemListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/item/params/ItemListParams.java
rename to src/main/java/com/chargebee/v4/models/item/params/ItemListParams.java
index 726a5799..daa2ac97 100644
--- a/src/main/java/com/chargebee/v4/core/models/item/params/ItemListParams.java
+++ b/src/main/java/com/chargebee/v4/models/item/params/ItemListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.item.params;
+package com.chargebee.v4.models.item.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/item/params/ItemRetrieveParams.java b/src/main/java/com/chargebee/v4/models/item/params/ItemRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/item/params/ItemRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/item/params/ItemRetrieveParams.java
index 78bbcfa3..7bb7973d 100644
--- a/src/main/java/com/chargebee/v4/core/models/item/params/ItemRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/item/params/ItemRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.item.params;
+package com.chargebee.v4.models.item.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/item/params/ItemUpdateParams.java b/src/main/java/com/chargebee/v4/models/item/params/ItemUpdateParams.java
new file mode 100644
index 00000000..2425e023
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/item/params/ItemUpdateParams.java
@@ -0,0 +1,1055 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.item.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.math.BigDecimal;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class ItemUpdateParams {
+
+  private final String name;
+
+  private final String description;
+
+  private final Boolean isShippable;
+
+  private final String externalName;
+
+  private final String itemFamilyId;
+
+  private final Boolean enabledInPortal;
+
+  private final String redirectUrl;
+
+  private final Boolean enabledForCheckout;
+
+  private final ItemApplicability itemApplicability;
+
+  private final Boolean clearApplicableItems;
+
+  private final List<String> applicableItems;
+
+  private final String unit;
+
+  private final String giftClaimRedirectUrl;
+
+  private final java.util.Map<String, Object> metadata;
+
+  private final Boolean includedInMrr;
+
+  private final Status status;
+
+  private final Boolean isPercentagePricing;
+
+  private final BundleConfigurationParams bundleConfiguration;
+
+  private final List<BundleItemsToAddParams> bundleItemsToAdd;
+
+  private final List<BundleItemsToUpdateParams> bundleItemsToUpdate;
+
+  private final List<BundleItemsToRemoveParams> bundleItemsToRemove;
+
+  private final Map<String, String> customFields;
+
+  private ItemUpdateParams(ItemUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.description = builder.description;
+
+    this.isShippable = builder.isShippable;
+
+    this.externalName = builder.externalName;
+
+    this.itemFamilyId = builder.itemFamilyId;
+
+    this.enabledInPortal = builder.enabledInPortal;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.enabledForCheckout = builder.enabledForCheckout;
+
+    this.itemApplicability = builder.itemApplicability;
+
+    this.clearApplicableItems = builder.clearApplicableItems;
+
+    this.applicableItems = builder.applicableItems;
+
+    this.unit = builder.unit;
+
+    this.giftClaimRedirectUrl = builder.giftClaimRedirectUrl;
+
+    this.metadata = builder.metadata;
+
+    this.includedInMrr = builder.includedInMrr;
+
+    this.status = builder.status;
+
+    this.isPercentagePricing = builder.isPercentagePricing;
+
+    this.bundleConfiguration = builder.bundleConfiguration;
+
+    this.bundleItemsToAdd = builder.bundleItemsToAdd;
+
+    this.bundleItemsToUpdate = builder.bundleItemsToUpdate;
+
+    this.bundleItemsToRemove = builder.bundleItemsToRemove;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public Boolean getIsShippable() {
+    return isShippable;
+  }
+
+  public String getExternalName() {
+    return externalName;
+  }
+
+  public String getItemFamilyId() {
+    return itemFamilyId;
+  }
+
+  public Boolean getEnabledInPortal() {
+    return enabledInPortal;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public Boolean getEnabledForCheckout() {
+    return enabledForCheckout;
+  }
+
+  public ItemApplicability getItemApplicability() {
+    return itemApplicability;
+  }
+
+  public Boolean getClearApplicableItems() {
+    return clearApplicableItems;
+  }
+
+  public List<String> getApplicableItems() {
+    return applicableItems;
+  }
+
+  public String getUnit() {
+    return unit;
+  }
+
+  public String getGiftClaimRedirectUrl() {
+    return giftClaimRedirectUrl;
+  }
+
+  public java.util.Map<String, Object> getMetadata() {
+    return metadata;
+  }
+
+  public Boolean getIncludedInMrr() {
+    return includedInMrr;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public Boolean getIsPercentagePricing() {
+    return isPercentagePricing;
+  }
+
+  public BundleConfigurationParams getBundleConfiguration() {
+    return bundleConfiguration;
+  }
+
+  public List<BundleItemsToAddParams> getBundleItemsToAdd() {
+    return bundleItemsToAdd;
+  }
+
+  public List<BundleItemsToUpdateParams> getBundleItemsToUpdate() {
+    return bundleItemsToUpdate;
+  }
+
+  public List<BundleItemsToRemoveParams> getBundleItemsToRemove() {
+    return bundleItemsToRemove;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.isShippable != null) {
+
+      formData.put("is_shippable", this.isShippable);
+    }
+
+    if (this.externalName != null) {
+
+      formData.put("external_name", this.externalName);
+    }
+
+    if (this.itemFamilyId != null) {
+
+      formData.put("item_family_id", this.itemFamilyId);
+    }
+
+    if (this.enabledInPortal != null) {
+
+      formData.put("enabled_in_portal", this.enabledInPortal);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.enabledForCheckout != null) {
+
+      formData.put("enabled_for_checkout", this.enabledForCheckout);
+    }
+
+    if (this.itemApplicability != null) {
+
+      formData.put("item_applicability", this.itemApplicability);
+    }
+
+    if (this.clearApplicableItems != null) {
+
+      formData.put("clear_applicable_items", this.clearApplicableItems);
+    }
+
+    if (this.applicableItems != null) {
+
+      formData.put("applicable_items", this.applicableItems);
+    }
+
+    if (this.unit != null) {
+
+      formData.put("unit", this.unit);
+    }
+
+    if (this.giftClaimRedirectUrl != null) {
+
+      formData.put("gift_claim_redirect_url", this.giftClaimRedirectUrl);
+    }
+
+    if (this.metadata != null) {
+
+      formData.put("metadata", JsonUtil.toJson(this.metadata));
+    }
+
+    if (this.includedInMrr != null) {
+
+      formData.put("included_in_mrr", this.includedInMrr);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.isPercentagePricing != null) {
+
+      formData.put("is_percentage_pricing", this.isPercentagePricing);
+    }
+
+    if (this.bundleConfiguration != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.bundleConfiguration.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "bundle_configuration[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.bundleItemsToAdd != null) {
+
+      // List of objects
+      for (int i = 0; i < this.bundleItemsToAdd.size(); i++) {
+        BundleItemsToAddParams item = this.bundleItemsToAdd.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "bundle_items_to_add[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.bundleItemsToUpdate != null) {
+
+      // List of objects
+      for (int i = 0; i < this.bundleItemsToUpdate.size(); i++) {
+        BundleItemsToUpdateParams item = this.bundleItemsToUpdate.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "bundle_items_to_update[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.bundleItemsToRemove != null) {
+
+      // List of objects
+      for (int i = 0; i < this.bundleItemsToRemove.size(); i++) {
+        BundleItemsToRemoveParams item = this.bundleItemsToRemove.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "bundle_items_to_remove[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for ItemUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ItemUpdateBuilder builder() {
+    return new ItemUpdateBuilder();
+  }
+
+  public static final class ItemUpdateBuilder {
+
+    private String name;
+
+    private String description;
+
+    private Boolean isShippable;
+
+    private String externalName;
+
+    private String itemFamilyId;
+
+    private Boolean enabledInPortal;
+
+    private String redirectUrl;
+
+    private Boolean enabledForCheckout;
+
+    private ItemApplicability itemApplicability;
+
+    private Boolean clearApplicableItems;
+
+    private List<String> applicableItems;
+
+    private String unit;
+
+    private String giftClaimRedirectUrl;
+
+    private java.util.Map<String, Object> metadata;
+
+    private Boolean includedInMrr;
+
+    private Status status;
+
+    private Boolean isPercentagePricing;
+
+    private BundleConfigurationParams bundleConfiguration;
+
+    private List<BundleItemsToAddParams> bundleItemsToAdd;
+
+    private List<BundleItemsToUpdateParams> bundleItemsToUpdate;
+
+    private List<BundleItemsToRemoveParams> bundleItemsToRemove;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private ItemUpdateBuilder() {}
+
+    public ItemUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder isShippable(Boolean value) {
+      this.isShippable = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder externalName(String value) {
+      this.externalName = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder itemFamilyId(String value) {
+      this.itemFamilyId = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder enabledInPortal(Boolean value) {
+      this.enabledInPortal = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder enabledForCheckout(Boolean value) {
+      this.enabledForCheckout = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder itemApplicability(ItemApplicability value) {
+      this.itemApplicability = value;
+      return this;
+    }
+
+    @Deprecated
+    public ItemUpdateBuilder clearApplicableItems(Boolean value) {
+      this.clearApplicableItems = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder applicableItems(List<String> value) {
+      this.applicableItems = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder unit(String value) {
+      this.unit = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder giftClaimRedirectUrl(String value) {
+      this.giftClaimRedirectUrl = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder metadata(java.util.Map<String, Object> value) {
+      this.metadata = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder includedInMrr(Boolean value) {
+      this.includedInMrr = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder isPercentagePricing(Boolean value) {
+      this.isPercentagePricing = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder bundleConfiguration(BundleConfigurationParams value) {
+      this.bundleConfiguration = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder bundleItemsToAdd(List<BundleItemsToAddParams> value) {
+      this.bundleItemsToAdd = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder bundleItemsToUpdate(List<BundleItemsToUpdateParams> value) {
+      this.bundleItemsToUpdate = value;
+      return this;
+    }
+
+    public ItemUpdateBuilder bundleItemsToRemove(List<BundleItemsToRemoveParams> value) {
+      this.bundleItemsToRemove = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public ItemUpdateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public ItemUpdateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public ItemUpdateParams build() {
+      return new ItemUpdateParams(this);
+    }
+  }
+
+  public enum ItemApplicability {
+    ALL("all"),
+
+    RESTRICTED("restricted"),
+
+    /** An enum member indicating that ItemApplicability was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ItemApplicability(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ItemApplicability fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ItemApplicability enumValue : ItemApplicability.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Status {
+    ACTIVE("active"),
+
+    ARCHIVED("archived"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class BundleConfigurationParams {
+
+    private final Type type;
+
+    private BundleConfigurationParams(BundleConfigurationBuilder builder) {
+
+      this.type = builder.type;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BundleConfigurationParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BundleConfigurationBuilder builder() {
+      return new BundleConfigurationBuilder();
+    }
+
+    public static final class BundleConfigurationBuilder {
+
+      private Type type;
+
+      private BundleConfigurationBuilder() {}
+
+      public BundleConfigurationBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      public BundleConfigurationParams build() {
+        return new BundleConfigurationParams(this);
+      }
+    }
+
+    public enum Type {
+      FIXED("fixed"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BundleItemsToAddParams {
+
+    private final String itemId;
+
+    private final ItemType itemType;
+
+    private final Integer quantity;
+
+    private final BigDecimal priceAllocation;
+
+    private BundleItemsToAddParams(BundleItemsToAddBuilder builder) {
+
+      this.itemId = builder.itemId;
+
+      this.itemType = builder.itemType;
+
+      this.quantity = builder.quantity;
+
+      this.priceAllocation = builder.priceAllocation;
+    }
+
+    public String getItemId() {
+      return itemId;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public BigDecimal getPriceAllocation() {
+      return priceAllocation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemId != null) {
+
+        formData.put("item_id", this.itemId);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.priceAllocation != null) {
+
+        formData.put("price_allocation", this.priceAllocation);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BundleItemsToAddParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BundleItemsToAddBuilder builder() {
+      return new BundleItemsToAddBuilder();
+    }
+
+    public static final class BundleItemsToAddBuilder {
+
+      private String itemId;
+
+      private ItemType itemType;
+
+      private Integer quantity;
+
+      private BigDecimal priceAllocation;
+
+      private BundleItemsToAddBuilder() {}
+
+      public BundleItemsToAddBuilder itemId(String value) {
+        this.itemId = value;
+        return this;
+      }
+
+      public BundleItemsToAddBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public BundleItemsToAddBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public BundleItemsToAddBuilder priceAllocation(BigDecimal value) {
+        this.priceAllocation = value;
+        return this;
+      }
+
+      public BundleItemsToAddParams build() {
+        return new BundleItemsToAddParams(this);
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BundleItemsToUpdateParams {
+
+    private final String itemId;
+
+    private final ItemType itemType;
+
+    private final Integer quantity;
+
+    private final BigDecimal priceAllocation;
+
+    private BundleItemsToUpdateParams(BundleItemsToUpdateBuilder builder) {
+
+      this.itemId = builder.itemId;
+
+      this.itemType = builder.itemType;
+
+      this.quantity = builder.quantity;
+
+      this.priceAllocation = builder.priceAllocation;
+    }
+
+    public String getItemId() {
+      return itemId;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public BigDecimal getPriceAllocation() {
+      return priceAllocation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemId != null) {
+
+        formData.put("item_id", this.itemId);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.priceAllocation != null) {
+
+        formData.put("price_allocation", this.priceAllocation);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BundleItemsToUpdateParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BundleItemsToUpdateBuilder builder() {
+      return new BundleItemsToUpdateBuilder();
+    }
+
+    public static final class BundleItemsToUpdateBuilder {
+
+      private String itemId;
+
+      private ItemType itemType;
+
+      private Integer quantity;
+
+      private BigDecimal priceAllocation;
+
+      private BundleItemsToUpdateBuilder() {}
+
+      public BundleItemsToUpdateBuilder itemId(String value) {
+        this.itemId = value;
+        return this;
+      }
+
+      public BundleItemsToUpdateBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public BundleItemsToUpdateBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public BundleItemsToUpdateBuilder priceAllocation(BigDecimal value) {
+        this.priceAllocation = value;
+        return this;
+      }
+
+      public BundleItemsToUpdateParams build() {
+        return new BundleItemsToUpdateParams(this);
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BundleItemsToRemoveParams {
+
+    private final String itemId;
+
+    private final ItemType itemType;
+
+    private BundleItemsToRemoveParams(BundleItemsToRemoveBuilder builder) {
+
+      this.itemId = builder.itemId;
+
+      this.itemType = builder.itemType;
+    }
+
+    public String getItemId() {
+      return itemId;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemId != null) {
+
+        formData.put("item_id", this.itemId);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BundleItemsToRemoveParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BundleItemsToRemoveBuilder builder() {
+      return new BundleItemsToRemoveBuilder();
+    }
+
+    public static final class BundleItemsToRemoveBuilder {
+
+      private String itemId;
+
+      private ItemType itemType;
+
+      private BundleItemsToRemoveBuilder() {}
+
+      public BundleItemsToRemoveBuilder itemId(String value) {
+        this.itemId = value;
+        return this;
+      }
+
+      public BundleItemsToRemoveBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public BundleItemsToRemoveParams build() {
+        return new BundleItemsToRemoveParams(this);
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/item/ItemCreateResponse.java b/src/main/java/com/chargebee/v4/models/item/responses/ItemCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/item/ItemCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/item/responses/ItemCreateResponse.java
index f1bf6116..45c55949 100644
--- a/src/main/java/com/chargebee/v4/core/responses/item/ItemCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/item/responses/ItemCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.item;
+package com.chargebee.v4.models.item.responses;
 
-import com.chargebee.v4.core.models.item.Item;
+import com.chargebee.v4.models.item.Item;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/item/ItemDeleteResponse.java b/src/main/java/com/chargebee/v4/models/item/responses/ItemDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/item/ItemDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/item/responses/ItemDeleteResponse.java
index c6901a21..6d447355 100644
--- a/src/main/java/com/chargebee/v4/core/responses/item/ItemDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/item/responses/ItemDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.item;
+package com.chargebee.v4.models.item.responses;
 
-import com.chargebee.v4.core.models.item.Item;
+import com.chargebee.v4.models.item.Item;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/item/ItemListResponse.java b/src/main/java/com/chargebee/v4/models/item/responses/ItemListResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/item/ItemListResponse.java
rename to src/main/java/com/chargebee/v4/models/item/responses/ItemListResponse.java
index bb2fe3a4..f1d87a53 100644
--- a/src/main/java/com/chargebee/v4/core/responses/item/ItemListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/item/responses/ItemListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.item;
+package com.chargebee.v4.models.item.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.item.Item;
+import com.chargebee.v4.models.item.Item;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.ItemService;
-import com.chargebee.v4.core.models.item.params.ItemListParams;
+import com.chargebee.v4.services.ItemService;
+import com.chargebee.v4.models.item.params.ItemListParams;
 
 /** Immutable response object for ItemList operation. Contains paginated list data. */
 public final class ItemListResponse {
@@ -95,9 +96,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public ItemListResponse nextPage() throws Exception {
+  public ItemListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/item/responses/ItemRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/item/responses/ItemRetrieveResponse.java
new file mode 100644
index 00000000..c5eaa0e8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/item/responses/ItemRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.item.responses;
+
+import com.chargebee.v4.models.item.Item;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ItemRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class ItemRetrieveResponse extends BaseResponse {
+  private final Item item;
+
+  private ItemRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.item = builder.item;
+  }
+
+  /** Parse JSON response into ItemRetrieveResponse object. */
+  public static ItemRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ItemRetrieveResponse object with HTTP response. */
+  public static ItemRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __itemJson = JsonUtil.getObject(json, "item");
+      if (__itemJson != null) {
+        builder.item(Item.fromJson(__itemJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ItemRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ItemRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ItemRetrieveResponse. */
+  public static class Builder {
+
+    private Item item;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder item(Item item) {
+      this.item = item;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ItemRetrieveResponse build() {
+      return new ItemRetrieveResponse(this);
+    }
+  }
+
+  /** Get the item from the response. */
+  public Item getItem() {
+    return item;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/item/ItemUpdateResponse.java b/src/main/java/com/chargebee/v4/models/item/responses/ItemUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/item/ItemUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/item/responses/ItemUpdateResponse.java
index 7b834988..b8aee7d8 100644
--- a/src/main/java/com/chargebee/v4/core/responses/item/ItemUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/item/responses/ItemUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.item;
+package com.chargebee.v4.models.item.responses;
 
-import com.chargebee.v4.core.models.item.Item;
+import com.chargebee.v4.models.item.Item;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemEntitlement/ItemEntitlement.java b/src/main/java/com/chargebee/v4/models/itemEntitlement/ItemEntitlement.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/itemEntitlement/ItemEntitlement.java
rename to src/main/java/com/chargebee/v4/models/itemEntitlement/ItemEntitlement.java
index 19b8c179..b10f43cd 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemEntitlement/ItemEntitlement.java
+++ b/src/main/java/com/chargebee/v4/models/itemEntitlement/ItemEntitlement.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemEntitlement;
+package com.chargebee.v4.models.itemEntitlement;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/models/itemEntitlement/params/AddItemEntitlementsParams.java b/src/main/java/com/chargebee/v4/models/itemEntitlement/params/AddItemEntitlementsParams.java
new file mode 100644
index 00000000..ff57f158
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemEntitlement/params/AddItemEntitlementsParams.java
@@ -0,0 +1,241 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.itemEntitlement.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class AddItemEntitlementsParams {
+
+  private final Action action;
+
+  private final List<ItemEntitlementsParams> itemEntitlements;
+
+  private AddItemEntitlementsParams(AddItemEntitlementsBuilder builder) {
+
+    this.action = builder.action;
+
+    this.itemEntitlements = builder.itemEntitlements;
+  }
+
+  public Action getAction() {
+    return action;
+  }
+
+  public List<ItemEntitlementsParams> getItemEntitlements() {
+    return itemEntitlements;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.action != null) {
+
+      formData.put("action", this.action);
+    }
+
+    if (this.itemEntitlements != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemEntitlements.size(); i++) {
+        ItemEntitlementsParams item = this.itemEntitlements.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_entitlements[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for AddItemEntitlementsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static AddItemEntitlementsBuilder builder() {
+    return new AddItemEntitlementsBuilder();
+  }
+
+  public static final class AddItemEntitlementsBuilder {
+
+    private Action action;
+
+    private List<ItemEntitlementsParams> itemEntitlements;
+
+    private AddItemEntitlementsBuilder() {}
+
+    public AddItemEntitlementsBuilder action(Action value) {
+      this.action = value;
+      return this;
+    }
+
+    public AddItemEntitlementsBuilder itemEntitlements(List<ItemEntitlementsParams> value) {
+      this.itemEntitlements = value;
+      return this;
+    }
+
+    public AddItemEntitlementsParams build() {
+      return new AddItemEntitlementsParams(this);
+    }
+  }
+
+  public enum Action {
+    UPSERT("upsert"),
+
+    REMOVE("remove"),
+
+    /** An enum member indicating that Action was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Action(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Action fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Action enumValue : Action.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ItemEntitlementsParams {
+
+    private final String itemId;
+
+    private final ItemType itemType;
+
+    private final String value;
+
+    private ItemEntitlementsParams(ItemEntitlementsBuilder builder) {
+
+      this.itemId = builder.itemId;
+
+      this.itemType = builder.itemType;
+
+      this.value = builder.value;
+    }
+
+    public String getItemId() {
+      return itemId;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemId != null) {
+
+        formData.put("item_id", this.itemId);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemEntitlementsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemEntitlementsBuilder builder() {
+      return new ItemEntitlementsBuilder();
+    }
+
+    public static final class ItemEntitlementsBuilder {
+
+      private String itemId;
+
+      private ItemType itemType;
+
+      private String value;
+
+      private ItemEntitlementsBuilder() {}
+
+      public ItemEntitlementsBuilder itemId(String value) {
+        this.itemId = value;
+        return this;
+      }
+
+      public ItemEntitlementsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public ItemEntitlementsBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public ItemEntitlementsParams build() {
+        return new ItemEntitlementsParams(this);
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      SUBSCRIPTION("subscription"),
+
+      ITEM("item"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/itemEntitlement/params/ItemEntitlementsForFeatureParams.java b/src/main/java/com/chargebee/v4/models/itemEntitlement/params/ItemEntitlementsForFeatureParams.java
new file mode 100644
index 00000000..14d7a2e8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemEntitlement/params/ItemEntitlementsForFeatureParams.java
@@ -0,0 +1,66 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.itemEntitlement.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ItemEntitlementsForFeatureParams {
+
+  private final Map<String, Object> queryParams;
+
+  private ItemEntitlementsForFeatureParams(ItemEntitlementsForFeatureBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public ItemEntitlementsForFeatureBuilder toBuilder() {
+    ItemEntitlementsForFeatureBuilder builder = new ItemEntitlementsForFeatureBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for ItemEntitlementsForFeatureParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ItemEntitlementsForFeatureBuilder builder() {
+    return new ItemEntitlementsForFeatureBuilder();
+  }
+
+  public static final class ItemEntitlementsForFeatureBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private ItemEntitlementsForFeatureBuilder() {}
+
+    public ItemEntitlementsForFeatureBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public ItemEntitlementsForFeatureBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    @Deprecated
+    public ItemEntitlementsForFeatureBuilder includeDrafts(Boolean value) {
+      queryParams.put("include_drafts", value);
+      return this;
+    }
+
+    public ItemEntitlementsForFeatureParams build() {
+      return new ItemEntitlementsForFeatureParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/itemEntitlement/params/ItemEntitlementsForItemParams.java b/src/main/java/com/chargebee/v4/models/itemEntitlement/params/ItemEntitlementsForItemParams.java
new file mode 100644
index 00000000..9364e052
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemEntitlement/params/ItemEntitlementsForItemParams.java
@@ -0,0 +1,72 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.itemEntitlement.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ItemEntitlementsForItemParams {
+
+  private final Map<String, Object> queryParams;
+
+  private ItemEntitlementsForItemParams(ItemEntitlementsForItemBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public ItemEntitlementsForItemBuilder toBuilder() {
+    ItemEntitlementsForItemBuilder builder = new ItemEntitlementsForItemBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for ItemEntitlementsForItemParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ItemEntitlementsForItemBuilder builder() {
+    return new ItemEntitlementsForItemBuilder();
+  }
+
+  public static final class ItemEntitlementsForItemBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private ItemEntitlementsForItemBuilder() {}
+
+    public ItemEntitlementsForItemBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public ItemEntitlementsForItemBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    @Deprecated
+    public ItemEntitlementsForItemBuilder includeDrafts(Boolean value) {
+      queryParams.put("include_drafts", value);
+      return this;
+    }
+
+    @Deprecated
+    public ItemEntitlementsForItemBuilder embed(String value) {
+      queryParams.put("embed", value);
+      return this;
+    }
+
+    public ItemEntitlementsForItemParams build() {
+      return new ItemEntitlementsForItemParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/itemEntitlement/params/UpsertOrRemoveItemEntitlementsForItemParams.java b/src/main/java/com/chargebee/v4/models/itemEntitlement/params/UpsertOrRemoveItemEntitlementsForItemParams.java
new file mode 100644
index 00000000..d3f24ed9
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemEntitlement/params/UpsertOrRemoveItemEntitlementsForItemParams.java
@@ -0,0 +1,189 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.itemEntitlement.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class UpsertOrRemoveItemEntitlementsForItemParams {
+
+  private final Action action;
+
+  private final List<ItemEntitlementsParams> itemEntitlements;
+
+  private UpsertOrRemoveItemEntitlementsForItemParams(
+      UpsertOrRemoveItemEntitlementsForItemBuilder builder) {
+
+    this.action = builder.action;
+
+    this.itemEntitlements = builder.itemEntitlements;
+  }
+
+  public Action getAction() {
+    return action;
+  }
+
+  public List<ItemEntitlementsParams> getItemEntitlements() {
+    return itemEntitlements;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.action != null) {
+
+      formData.put("action", this.action);
+    }
+
+    if (this.itemEntitlements != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemEntitlements.size(); i++) {
+        ItemEntitlementsParams item = this.itemEntitlements.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_entitlements[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for UpsertOrRemoveItemEntitlementsForItemParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UpsertOrRemoveItemEntitlementsForItemBuilder builder() {
+    return new UpsertOrRemoveItemEntitlementsForItemBuilder();
+  }
+
+  public static final class UpsertOrRemoveItemEntitlementsForItemBuilder {
+
+    private Action action;
+
+    private List<ItemEntitlementsParams> itemEntitlements;
+
+    private UpsertOrRemoveItemEntitlementsForItemBuilder() {}
+
+    public UpsertOrRemoveItemEntitlementsForItemBuilder action(Action value) {
+      this.action = value;
+      return this;
+    }
+
+    public UpsertOrRemoveItemEntitlementsForItemBuilder itemEntitlements(
+        List<ItemEntitlementsParams> value) {
+      this.itemEntitlements = value;
+      return this;
+    }
+
+    public UpsertOrRemoveItemEntitlementsForItemParams build() {
+      return new UpsertOrRemoveItemEntitlementsForItemParams(this);
+    }
+  }
+
+  public enum Action {
+    UPSERT("upsert"),
+
+    REMOVE("remove"),
+
+    /** An enum member indicating that Action was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Action(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Action fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Action enumValue : Action.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ItemEntitlementsParams {
+
+    private final String featureId;
+
+    private final String value;
+
+    private ItemEntitlementsParams(ItemEntitlementsBuilder builder) {
+
+      this.featureId = builder.featureId;
+
+      this.value = builder.value;
+    }
+
+    public String getFeatureId() {
+      return featureId;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.featureId != null) {
+
+        formData.put("feature_id", this.featureId);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemEntitlementsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemEntitlementsBuilder builder() {
+      return new ItemEntitlementsBuilder();
+    }
+
+    public static final class ItemEntitlementsBuilder {
+
+      private String featureId;
+
+      private String value;
+
+      private ItemEntitlementsBuilder() {}
+
+      public ItemEntitlementsBuilder featureId(String value) {
+        this.featureId = value;
+        return this;
+      }
+
+      public ItemEntitlementsBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public ItemEntitlementsParams build() {
+        return new ItemEntitlementsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/itemEntitlement/responses/AddItemEntitlementsResponse.java b/src/main/java/com/chargebee/v4/models/itemEntitlement/responses/AddItemEntitlementsResponse.java
new file mode 100644
index 00000000..a5a73f1a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemEntitlement/responses/AddItemEntitlementsResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.itemEntitlement.responses;
+
+import com.chargebee.v4.models.itemEntitlement.ItemEntitlement;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for AddItemEntitlements operation. Contains the response data from the
+ * API.
+ */
+public final class AddItemEntitlementsResponse extends BaseResponse {
+  private final ItemEntitlement itemEntitlement;
+
+  private AddItemEntitlementsResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.itemEntitlement = builder.itemEntitlement;
+  }
+
+  /** Parse JSON response into AddItemEntitlementsResponse object. */
+  public static AddItemEntitlementsResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into AddItemEntitlementsResponse object with HTTP response. */
+  public static AddItemEntitlementsResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __itemEntitlementJson = JsonUtil.getObject(json, "item_entitlement");
+      if (__itemEntitlementJson != null) {
+        builder.itemEntitlement(ItemEntitlement.fromJson(__itemEntitlementJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse AddItemEntitlementsResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for AddItemEntitlementsResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for AddItemEntitlementsResponse. */
+  public static class Builder {
+
+    private ItemEntitlement itemEntitlement;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder itemEntitlement(ItemEntitlement itemEntitlement) {
+      this.itemEntitlement = itemEntitlement;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public AddItemEntitlementsResponse build() {
+      return new AddItemEntitlementsResponse(this);
+    }
+  }
+
+  /** Get the itemEntitlement from the response. */
+  public ItemEntitlement getItemEntitlement() {
+    return itemEntitlement;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/itemEntitlement/responses/ItemEntitlementsForFeatureResponse.java b/src/main/java/com/chargebee/v4/models/itemEntitlement/responses/ItemEntitlementsForFeatureResponse.java
new file mode 100644
index 00000000..441e2921
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemEntitlement/responses/ItemEntitlementsForFeatureResponse.java
@@ -0,0 +1,177 @@
+package com.chargebee.v4.models.itemEntitlement.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.itemEntitlement.ItemEntitlement;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.ItemEntitlementService;
+import com.chargebee.v4.models.itemEntitlement.params.ItemEntitlementsForFeatureParams;
+
+/**
+ * Immutable response object for ItemEntitlementsForFeature operation. Contains paginated list data.
+ */
+public final class ItemEntitlementsForFeatureResponse {
+
+  private final List<ItemEntitlementItemEntitlementsForFeatureItem> list;
+
+  private final String nextOffset;
+
+  private final String featureId;
+
+  private final ItemEntitlementService service;
+  private final ItemEntitlementsForFeatureParams originalParams;
+  private final Response httpResponse;
+
+  private ItemEntitlementsForFeatureResponse(
+      List<ItemEntitlementItemEntitlementsForFeatureItem> list,
+      String nextOffset,
+      String featureId,
+      ItemEntitlementService service,
+      ItemEntitlementsForFeatureParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.featureId = featureId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into ItemEntitlementsForFeatureResponse object (no service context). Use
+   * this when you only need to read a single page (no nextPage()).
+   */
+  public static ItemEntitlementsForFeatureResponse fromJson(String json) {
+    try {
+
+      List<ItemEntitlementItemEntitlementsForFeatureItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(ItemEntitlementItemEntitlementsForFeatureItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new ItemEntitlementsForFeatureResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ItemEntitlementsForFeatureResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into ItemEntitlementsForFeatureResponse object with service context for
+   * pagination (enables nextPage()).
+   */
+  public static ItemEntitlementsForFeatureResponse fromJson(
+      String json,
+      ItemEntitlementService service,
+      ItemEntitlementsForFeatureParams originalParams,
+      String featureId,
+      Response httpResponse) {
+    try {
+
+      List<ItemEntitlementItemEntitlementsForFeatureItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(ItemEntitlementItemEntitlementsForFeatureItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new ItemEntitlementsForFeatureResponse(
+          list, nextOffset, featureId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ItemEntitlementsForFeatureResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<ItemEntitlementItemEntitlementsForFeatureItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public ItemEntitlementsForFeatureResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    ItemEntitlementsForFeatureParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : ItemEntitlementsForFeatureParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.itemEntitlementsForFeature(featureId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class ItemEntitlementItemEntitlementsForFeatureItem {
+
+    private ItemEntitlement itemEntitlement;
+
+    public ItemEntitlement getItemEntitlement() {
+      return itemEntitlement;
+    }
+
+    public static ItemEntitlementItemEntitlementsForFeatureItem fromJson(String json) {
+      ItemEntitlementItemEntitlementsForFeatureItem item =
+          new ItemEntitlementItemEntitlementsForFeatureItem();
+
+      String __itemEntitlementJson = JsonUtil.getObject(json, "item_entitlement");
+      if (__itemEntitlementJson != null) {
+        item.itemEntitlement = ItemEntitlement.fromJson(__itemEntitlementJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/itemEntitlement/responses/ItemEntitlementsForItemResponse.java b/src/main/java/com/chargebee/v4/models/itemEntitlement/responses/ItemEntitlementsForItemResponse.java
new file mode 100644
index 00000000..5809878d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemEntitlement/responses/ItemEntitlementsForItemResponse.java
@@ -0,0 +1,177 @@
+package com.chargebee.v4.models.itemEntitlement.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.itemEntitlement.ItemEntitlement;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.ItemEntitlementService;
+import com.chargebee.v4.models.itemEntitlement.params.ItemEntitlementsForItemParams;
+
+/**
+ * Immutable response object for ItemEntitlementsForItem operation. Contains paginated list data.
+ */
+public final class ItemEntitlementsForItemResponse {
+
+  private final List<ItemEntitlementItemEntitlementsForItemItem> list;
+
+  private final String nextOffset;
+
+  private final String itemId;
+
+  private final ItemEntitlementService service;
+  private final ItemEntitlementsForItemParams originalParams;
+  private final Response httpResponse;
+
+  private ItemEntitlementsForItemResponse(
+      List<ItemEntitlementItemEntitlementsForItemItem> list,
+      String nextOffset,
+      String itemId,
+      ItemEntitlementService service,
+      ItemEntitlementsForItemParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.itemId = itemId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into ItemEntitlementsForItemResponse object (no service context). Use this
+   * when you only need to read a single page (no nextPage()).
+   */
+  public static ItemEntitlementsForItemResponse fromJson(String json) {
+    try {
+
+      List<ItemEntitlementItemEntitlementsForItemItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(ItemEntitlementItemEntitlementsForItemItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new ItemEntitlementsForItemResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ItemEntitlementsForItemResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into ItemEntitlementsForItemResponse object with service context for
+   * pagination (enables nextPage()).
+   */
+  public static ItemEntitlementsForItemResponse fromJson(
+      String json,
+      ItemEntitlementService service,
+      ItemEntitlementsForItemParams originalParams,
+      String itemId,
+      Response httpResponse) {
+    try {
+
+      List<ItemEntitlementItemEntitlementsForItemItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(ItemEntitlementItemEntitlementsForItemItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new ItemEntitlementsForItemResponse(
+          list, nextOffset, itemId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ItemEntitlementsForItemResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<ItemEntitlementItemEntitlementsForItemItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public ItemEntitlementsForItemResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    ItemEntitlementsForItemParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : ItemEntitlementsForItemParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.itemEntitlementsForItem(itemId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class ItemEntitlementItemEntitlementsForItemItem {
+
+    private ItemEntitlement itemEntitlement;
+
+    public ItemEntitlement getItemEntitlement() {
+      return itemEntitlement;
+    }
+
+    public static ItemEntitlementItemEntitlementsForItemItem fromJson(String json) {
+      ItemEntitlementItemEntitlementsForItemItem item =
+          new ItemEntitlementItemEntitlementsForItemItem();
+
+      String __itemEntitlementJson = JsonUtil.getObject(json, "item_entitlement");
+      if (__itemEntitlementJson != null) {
+        item.itemEntitlement = ItemEntitlement.fromJson(__itemEntitlementJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/itemEntitlement/responses/UpsertOrRemoveItemEntitlementsForItemResponse.java b/src/main/java/com/chargebee/v4/models/itemEntitlement/responses/UpsertOrRemoveItemEntitlementsForItemResponse.java
new file mode 100644
index 00000000..c5e1db68
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemEntitlement/responses/UpsertOrRemoveItemEntitlementsForItemResponse.java
@@ -0,0 +1,82 @@
+package com.chargebee.v4.models.itemEntitlement.responses;
+
+import com.chargebee.v4.models.itemEntitlement.ItemEntitlement;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for UpsertOrRemoveItemEntitlementsForItem operation. Contains the
+ * response data from the API.
+ */
+public final class UpsertOrRemoveItemEntitlementsForItemResponse extends BaseResponse {
+  private final ItemEntitlement itemEntitlement;
+
+  private UpsertOrRemoveItemEntitlementsForItemResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.itemEntitlement = builder.itemEntitlement;
+  }
+
+  /** Parse JSON response into UpsertOrRemoveItemEntitlementsForItemResponse object. */
+  public static UpsertOrRemoveItemEntitlementsForItemResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into UpsertOrRemoveItemEntitlementsForItemResponse object with HTTP
+   * response.
+   */
+  public static UpsertOrRemoveItemEntitlementsForItemResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __itemEntitlementJson = JsonUtil.getObject(json, "item_entitlement");
+      if (__itemEntitlementJson != null) {
+        builder.itemEntitlement(ItemEntitlement.fromJson(__itemEntitlementJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse UpsertOrRemoveItemEntitlementsForItemResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for UpsertOrRemoveItemEntitlementsForItemResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for UpsertOrRemoveItemEntitlementsForItemResponse. */
+  public static class Builder {
+
+    private ItemEntitlement itemEntitlement;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder itemEntitlement(ItemEntitlement itemEntitlement) {
+      this.itemEntitlement = itemEntitlement;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public UpsertOrRemoveItemEntitlementsForItemResponse build() {
+      return new UpsertOrRemoveItemEntitlementsForItemResponse(this);
+    }
+  }
+
+  /** Get the itemEntitlement from the response. */
+  public ItemEntitlement getItemEntitlement() {
+    return itemEntitlement;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/itemFamily/ItemFamily.java b/src/main/java/com/chargebee/v4/models/itemFamily/ItemFamily.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/models/itemFamily/ItemFamily.java
rename to src/main/java/com/chargebee/v4/models/itemFamily/ItemFamily.java
index 7520f419..94d847bf 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemFamily/ItemFamily.java
+++ b/src/main/java/com/chargebee/v4/models/itemFamily/ItemFamily.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemFamily;
+package com.chargebee.v4.models.itemFamily;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -22,7 +22,7 @@ public class ItemFamily {
   private String businessEntityId;
   private Boolean deleted;
 
-  private java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+  private java.util.Map<String, String> customFields = new java.util.HashMap<>();
 
   public String getId() {
     return id;
@@ -66,7 +66,7 @@ public Boolean getDeleted() {
    *
    * @return map containing all custom fields
    */
-  public java.util.Map<String, Object> getCustomFields() {
+  public java.util.Map<String, String> getCustomFields() {
     return customFields;
   }
 
@@ -76,7 +76,7 @@ public java.util.Map<String, Object> getCustomFields() {
    * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
    * @return the value of the custom field, or null if not present
    */
-  public Object getCustomField(String fieldName) {
+  public String getCustomField(String fieldName) {
     return customFields.get(fieldName);
   }
 
@@ -141,7 +141,7 @@ public static Channel fromString(String value) {
   public static ItemFamily fromJson(String json) {
     ItemFamily obj = new ItemFamily();
 
-    // Parse JSON to extract all keys
+    // Parse JSON to extract all keys for custom field extraction
     java.util.Set<String> knownFields = new java.util.HashSet<>();
 
     knownFields.add("id");
@@ -194,9 +194,9 @@ public static ItemFamily fromJson(String json) {
    * @param knownFields set of known field names
    * @return map of custom fields
    */
-  private static java.util.Map<String, Object> extractCustomFields(
+  private static java.util.Map<String, String> extractCustomFields(
       String json, java.util.Set<String> knownFields) {
-    java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+    java.util.Map<String, String> customFields = new java.util.HashMap<>();
     try {
       // Parse the entire JSON as a map
       java.util.Map<String, Object> allFields = JsonUtil.parseJsonObjectToMap(json);
@@ -205,7 +205,8 @@ private static java.util.Map<String, Object> extractCustomFields(
           String key = entry.getKey();
           // Include fields that start with "cf_" and are not in knownFields
           if (key != null && key.startsWith("cf_") && !knownFields.contains(key)) {
-            customFields.put(key, entry.getValue());
+            customFields.put(
+                key, entry.getValue() != null ? String.valueOf(entry.getValue()) : null);
           }
         }
       }
diff --git a/src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyCreateParams.java b/src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyCreateParams.java
new file mode 100644
index 00000000..1052c29a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyCreateParams.java
@@ -0,0 +1,172 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.itemFamily.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ItemFamilyCreateParams {
+
+  private final String id;
+
+  private final String name;
+
+  private final String description;
+
+  private final String businessEntityId;
+
+  private final Map<String, String> customFields;
+
+  private ItemFamilyCreateParams(ItemFamilyCreateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.name = builder.name;
+
+    this.description = builder.description;
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public String getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.businessEntityId != null) {
+
+      formData.put("business_entity_id", this.businessEntityId);
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for ItemFamilyCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ItemFamilyCreateBuilder builder() {
+    return new ItemFamilyCreateBuilder();
+  }
+
+  public static final class ItemFamilyCreateBuilder {
+
+    private String id;
+
+    private String name;
+
+    private String description;
+
+    private String businessEntityId;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private ItemFamilyCreateBuilder() {}
+
+    public ItemFamilyCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public ItemFamilyCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public ItemFamilyCreateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public ItemFamilyCreateBuilder businessEntityId(String value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public ItemFamilyCreateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public ItemFamilyCreateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public ItemFamilyCreateParams build() {
+      return new ItemFamilyCreateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyDeleteParams.java b/src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyDeleteParams.java
index 0525f3bb..a2a6e2ca 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyDeleteParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.itemFamily.params;
+package com.chargebee.v4.models.itemFamily.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class ItemFamilyDeleteParams {
 
-  private final Map<String, Object> formData;
-
-  private ItemFamilyDeleteParams(ItemFamilyDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private ItemFamilyDeleteParams(ItemFamilyDeleteBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static ItemFamilyDeleteBuilder builder() {
   }
 
   public static final class ItemFamilyDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private ItemFamilyDeleteBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyListParams.java b/src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyListParams.java
rename to src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyListParams.java
index 72f3f95b..f6f2b418 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyListParams.java
+++ b/src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemFamily.params;
+package com.chargebee.v4.models.itemFamily.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyRetrieveParams.java b/src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyRetrieveParams.java
index 668e6c49..140b276a 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemFamily/params/ItemFamilyRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemFamily.params;
+package com.chargebee.v4.models.itemFamily.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyUpdateParams.java b/src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyUpdateParams.java
new file mode 100644
index 00000000..fa11292a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemFamily/params/ItemFamilyUpdateParams.java
@@ -0,0 +1,132 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.itemFamily.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ItemFamilyUpdateParams {
+
+  private final String name;
+
+  private final String description;
+
+  private final Map<String, String> customFields;
+
+  private ItemFamilyUpdateParams(ItemFamilyUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.description = builder.description;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for ItemFamilyUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ItemFamilyUpdateBuilder builder() {
+    return new ItemFamilyUpdateBuilder();
+  }
+
+  public static final class ItemFamilyUpdateBuilder {
+
+    private String name;
+
+    private String description;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private ItemFamilyUpdateBuilder() {}
+
+    public ItemFamilyUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public ItemFamilyUpdateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public ItemFamilyUpdateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public ItemFamilyUpdateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public ItemFamilyUpdateParams build() {
+      return new ItemFamilyUpdateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyCreateResponse.java b/src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyCreateResponse.java
index 782b0859..65e7f110 100644
--- a/src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.itemFamily;
+package com.chargebee.v4.models.itemFamily.responses;
 
-import com.chargebee.v4.core.models.itemFamily.ItemFamily;
+import com.chargebee.v4.models.itemFamily.ItemFamily;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyDeleteResponse.java b/src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyDeleteResponse.java
index 634cbb0f..11244794 100644
--- a/src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.itemFamily;
+package com.chargebee.v4.models.itemFamily.responses;
 
-import com.chargebee.v4.core.models.itemFamily.ItemFamily;
+import com.chargebee.v4.models.itemFamily.ItemFamily;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyListResponse.java b/src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyListResponse.java
rename to src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyListResponse.java
index 3135fbbf..4eb184e4 100644
--- a/src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.itemFamily;
+package com.chargebee.v4.models.itemFamily.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.itemFamily.ItemFamily;
+import com.chargebee.v4.models.itemFamily.ItemFamily;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.ItemFamilyService;
-import com.chargebee.v4.core.models.itemFamily.params.ItemFamilyListParams;
+import com.chargebee.v4.services.ItemFamilyService;
+import com.chargebee.v4.models.itemFamily.params.ItemFamilyListParams;
 
 /** Immutable response object for ItemFamilyList operation. Contains paginated list data. */
 public final class ItemFamilyListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public ItemFamilyListResponse nextPage() throws Exception {
+  public ItemFamilyListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyRetrieveResponse.java
new file mode 100644
index 00000000..cbbd16ee
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.itemFamily.responses;
+
+import com.chargebee.v4.models.itemFamily.ItemFamily;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ItemFamilyRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class ItemFamilyRetrieveResponse extends BaseResponse {
+  private final ItemFamily itemFamily;
+
+  private ItemFamilyRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.itemFamily = builder.itemFamily;
+  }
+
+  /** Parse JSON response into ItemFamilyRetrieveResponse object. */
+  public static ItemFamilyRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ItemFamilyRetrieveResponse object with HTTP response. */
+  public static ItemFamilyRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __itemFamilyJson = JsonUtil.getObject(json, "item_family");
+      if (__itemFamilyJson != null) {
+        builder.itemFamily(ItemFamily.fromJson(__itemFamilyJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ItemFamilyRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ItemFamilyRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ItemFamilyRetrieveResponse. */
+  public static class Builder {
+
+    private ItemFamily itemFamily;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder itemFamily(ItemFamily itemFamily) {
+      this.itemFamily = itemFamily;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ItemFamilyRetrieveResponse build() {
+      return new ItemFamilyRetrieveResponse(this);
+    }
+  }
+
+  /** Get the itemFamily from the response. */
+  public ItemFamily getItemFamily() {
+    return itemFamily;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyUpdateResponse.java b/src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyUpdateResponse.java
index 9b61abfb..0cc0e902 100644
--- a/src/main/java/com/chargebee/v4/core/responses/itemFamily/ItemFamilyUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.itemFamily;
+package com.chargebee.v4.models.itemFamily.responses;
 
-import com.chargebee.v4.core.models.itemFamily.ItemFamily;
+import com.chargebee.v4.models.itemFamily.ItemFamily;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemPrice/ItemPrice.java b/src/main/java/com/chargebee/v4/models/itemPrice/ItemPrice.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/itemPrice/ItemPrice.java
rename to src/main/java/com/chargebee/v4/models/itemPrice/ItemPrice.java
index 24227cdc..6195156d 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemPrice/ItemPrice.java
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/ItemPrice.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemPrice;
+package com.chargebee.v4.models.itemPrice;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -57,7 +57,7 @@ public class ItemPrice {
   private List<TaxProvidersFields> taxProvidersFields;
   private AccountingDetail accountingDetail;
 
-  private java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+  private java.util.Map<String, String> customFields = new java.util.HashMap<>();
 
   public String getId() {
     return id;
@@ -239,7 +239,7 @@ public AccountingDetail getAccountingDetail() {
    *
    * @return map containing all custom fields
    */
-  public java.util.Map<String, Object> getCustomFields() {
+  public java.util.Map<String, String> getCustomFields() {
     return customFields;
   }
 
@@ -249,7 +249,7 @@ public java.util.Map<String, Object> getCustomFields() {
    * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
    * @return the value of the custom field, or null if not present
    */
-  public Object getCustomField(String fieldName) {
+  public String getCustomField(String fieldName) {
     return customFields.get(fieldName);
   }
 
@@ -563,7 +563,7 @@ public static ItemType fromString(String value) {
   public static ItemPrice fromJson(String json) {
     ItemPrice obj = new ItemPrice();
 
-    // Parse JSON to extract all keys
+    // Parse JSON to extract all keys for custom field extraction
     java.util.Set<String> knownFields = new java.util.HashSet<>();
 
     knownFields.add("id");
@@ -771,9 +771,9 @@ public static ItemPrice fromJson(String json) {
    * @param knownFields set of known field names
    * @return map of custom fields
    */
-  private static java.util.Map<String, Object> extractCustomFields(
+  private static java.util.Map<String, String> extractCustomFields(
       String json, java.util.Set<String> knownFields) {
-    java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+    java.util.Map<String, String> customFields = new java.util.HashMap<>();
     try {
       // Parse the entire JSON as a map
       java.util.Map<String, Object> allFields = JsonUtil.parseJsonObjectToMap(json);
@@ -782,7 +782,8 @@ private static java.util.Map<String, Object> extractCustomFields(
           String key = entry.getKey();
           // Include fields that start with "cf_" and are not in knownFields
           if (key != null && key.startsWith("cf_") && !knownFields.contains(key)) {
-            customFields.put(key, entry.getValue());
+            customFields.put(
+                key, entry.getValue() != null ? String.valueOf(entry.getValue()) : null);
           }
         }
       }
diff --git a/src/main/java/com/chargebee/v4/models/itemPrice/params/FindApplicableItemPricesParams.java b/src/main/java/com/chargebee/v4/models/itemPrice/params/FindApplicableItemPricesParams.java
new file mode 100644
index 00000000..16e72bd8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/params/FindApplicableItemPricesParams.java
@@ -0,0 +1,174 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.itemPrice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class FindApplicableItemPricesParams {
+
+  private final Map<String, Object> queryParams;
+
+  private FindApplicableItemPricesParams(FindApplicableItemPricesBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public FindApplicableItemPricesBuilder toBuilder() {
+    FindApplicableItemPricesBuilder builder = new FindApplicableItemPricesBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for FindApplicableItemPricesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static FindApplicableItemPricesBuilder builder() {
+    return new FindApplicableItemPricesBuilder();
+  }
+
+  public static final class FindApplicableItemPricesBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private FindApplicableItemPricesBuilder() {}
+
+    public FindApplicableItemPricesBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public FindApplicableItemPricesBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public FindApplicableItemPricesBuilder itemId(String value) {
+      queryParams.put("item_id", value);
+      return this;
+    }
+
+    public SortBySortBuilder sortBy() {
+      return new SortBySortBuilder("sort_by", this);
+    }
+
+    public FindApplicableItemPricesParams build() {
+      return new FindApplicableItemPricesParams(this);
+    }
+
+    public static final class SortBySortBuilder {
+      private final String fieldName;
+      private final FindApplicableItemPricesBuilder builder;
+
+      SortBySortBuilder(String fieldName, FindApplicableItemPricesBuilder builder) {
+        this.fieldName = fieldName;
+        this.builder = builder;
+      }
+
+      public SortDirection name() {
+        return new SortDirection(fieldName, "name", builder);
+      }
+
+      public SortDirection id() {
+        return new SortDirection(fieldName, "id", builder);
+      }
+
+      public SortDirection updated_at() {
+        return new SortDirection(fieldName, "updated_at", builder);
+      }
+    }
+
+    public static final class SortDirection {
+      private final String fieldName;
+      private final String selectedField;
+      private final FindApplicableItemPricesBuilder builder;
+
+      SortDirection(
+          String fieldName, String selectedField, FindApplicableItemPricesBuilder builder) {
+        this.fieldName = fieldName;
+        this.selectedField = selectedField;
+        this.builder = builder;
+      }
+
+      public FindApplicableItemPricesBuilder asc() {
+        builder.queryParams.put(fieldName + "[asc]", selectedField);
+        return builder;
+      }
+
+      public FindApplicableItemPricesBuilder desc() {
+        builder.queryParams.put(fieldName + "[desc]", selectedField);
+        return builder;
+      }
+    }
+  }
+
+  public enum SortByAsc {
+    NAME("name"),
+
+    ID("id"),
+
+    UPDATED_AT("updated_at"),
+
+    /** An enum member indicating that SortByAsc was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    SortByAsc(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static SortByAsc fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (SortByAsc enumValue : SortByAsc.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum SortByDesc {
+    NAME("name"),
+
+    ID("id"),
+
+    UPDATED_AT("updated_at"),
+
+    /** An enum member indicating that SortByDesc was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    SortByDesc(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static SortByDesc fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (SortByDesc enumValue : SortByDesc.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceCreateParams.java b/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceCreateParams.java
new file mode 100644
index 00000000..15981b85
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceCreateParams.java
@@ -0,0 +1,1636 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.itemPrice.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class ItemPriceCreateParams {
+
+  private final String id;
+
+  private final String name;
+
+  private final String description;
+
+  private final String itemId;
+
+  private final String invoiceNotes;
+
+  private final ProrationType prorationType;
+
+  private final String externalName;
+
+  private final String currencyCode;
+
+  private final String priceVariantId;
+
+  private final Boolean isTaxable;
+
+  private final Integer freeQuantity;
+
+  private final String freeQuantityInDecimal;
+
+  private final java.util.Map<String, Object> metadata;
+
+  private final Boolean showDescriptionInInvoices;
+
+  private final Boolean showDescriptionInQuotes;
+
+  private final UsageAccumulationResetFrequency usageAccumulationResetFrequency;
+
+  private final String businessEntityId;
+
+  private final PricingModel pricingModel;
+
+  private final Long price;
+
+  private final String priceInDecimal;
+
+  private final PeriodUnit periodUnit;
+
+  private final Integer period;
+
+  private final TrialPeriodUnit trialPeriodUnit;
+
+  private final Integer trialPeriod;
+
+  private final Integer shippingPeriod;
+
+  private final ShippingPeriodUnit shippingPeriodUnit;
+
+  private final Integer billingCycles;
+
+  private final TrialEndAction trialEndAction;
+
+  private final TaxDetailParams taxDetail;
+
+  private final AccountingDetailParams accountingDetail;
+
+  private final List<TiersParams> tiers;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private final Map<String, String> customFields;
+
+  private ItemPriceCreateParams(ItemPriceCreateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.name = builder.name;
+
+    this.description = builder.description;
+
+    this.itemId = builder.itemId;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.prorationType = builder.prorationType;
+
+    this.externalName = builder.externalName;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.priceVariantId = builder.priceVariantId;
+
+    this.isTaxable = builder.isTaxable;
+
+    this.freeQuantity = builder.freeQuantity;
+
+    this.freeQuantityInDecimal = builder.freeQuantityInDecimal;
+
+    this.metadata = builder.metadata;
+
+    this.showDescriptionInInvoices = builder.showDescriptionInInvoices;
+
+    this.showDescriptionInQuotes = builder.showDescriptionInQuotes;
+
+    this.usageAccumulationResetFrequency = builder.usageAccumulationResetFrequency;
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.pricingModel = builder.pricingModel;
+
+    this.price = builder.price;
+
+    this.priceInDecimal = builder.priceInDecimal;
+
+    this.periodUnit = builder.periodUnit;
+
+    this.period = builder.period;
+
+    this.trialPeriodUnit = builder.trialPeriodUnit;
+
+    this.trialPeriod = builder.trialPeriod;
+
+    this.shippingPeriod = builder.shippingPeriod;
+
+    this.shippingPeriodUnit = builder.shippingPeriodUnit;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.trialEndAction = builder.trialEndAction;
+
+    this.taxDetail = builder.taxDetail;
+
+    this.accountingDetail = builder.accountingDetail;
+
+    this.tiers = builder.tiers;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public String getItemId() {
+    return itemId;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public ProrationType getProrationType() {
+    return prorationType;
+  }
+
+  public String getExternalName() {
+    return externalName;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getPriceVariantId() {
+    return priceVariantId;
+  }
+
+  public Boolean getIsTaxable() {
+    return isTaxable;
+  }
+
+  public Integer getFreeQuantity() {
+    return freeQuantity;
+  }
+
+  public String getFreeQuantityInDecimal() {
+    return freeQuantityInDecimal;
+  }
+
+  public java.util.Map<String, Object> getMetadata() {
+    return metadata;
+  }
+
+  public Boolean getShowDescriptionInInvoices() {
+    return showDescriptionInInvoices;
+  }
+
+  public Boolean getShowDescriptionInQuotes() {
+    return showDescriptionInQuotes;
+  }
+
+  public UsageAccumulationResetFrequency getUsageAccumulationResetFrequency() {
+    return usageAccumulationResetFrequency;
+  }
+
+  public String getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public PricingModel getPricingModel() {
+    return pricingModel;
+  }
+
+  public Long getPrice() {
+    return price;
+  }
+
+  public String getPriceInDecimal() {
+    return priceInDecimal;
+  }
+
+  public PeriodUnit getPeriodUnit() {
+    return periodUnit;
+  }
+
+  public Integer getPeriod() {
+    return period;
+  }
+
+  public TrialPeriodUnit getTrialPeriodUnit() {
+    return trialPeriodUnit;
+  }
+
+  public Integer getTrialPeriod() {
+    return trialPeriod;
+  }
+
+  public Integer getShippingPeriod() {
+    return shippingPeriod;
+  }
+
+  public ShippingPeriodUnit getShippingPeriodUnit() {
+    return shippingPeriodUnit;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public TrialEndAction getTrialEndAction() {
+    return trialEndAction;
+  }
+
+  public TaxDetailParams getTaxDetail() {
+    return taxDetail;
+  }
+
+  public AccountingDetailParams getAccountingDetail() {
+    return accountingDetail;
+  }
+
+  public List<TiersParams> getTiers() {
+    return tiers;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.itemId != null) {
+
+      formData.put("item_id", this.itemId);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.prorationType != null) {
+
+      formData.put("proration_type", this.prorationType);
+    }
+
+    if (this.externalName != null) {
+
+      formData.put("external_name", this.externalName);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.priceVariantId != null) {
+
+      formData.put("price_variant_id", this.priceVariantId);
+    }
+
+    if (this.isTaxable != null) {
+
+      formData.put("is_taxable", this.isTaxable);
+    }
+
+    if (this.freeQuantity != null) {
+
+      formData.put("free_quantity", this.freeQuantity);
+    }
+
+    if (this.freeQuantityInDecimal != null) {
+
+      formData.put("free_quantity_in_decimal", this.freeQuantityInDecimal);
+    }
+
+    if (this.metadata != null) {
+
+      formData.put("metadata", JsonUtil.toJson(this.metadata));
+    }
+
+    if (this.showDescriptionInInvoices != null) {
+
+      formData.put("show_description_in_invoices", this.showDescriptionInInvoices);
+    }
+
+    if (this.showDescriptionInQuotes != null) {
+
+      formData.put("show_description_in_quotes", this.showDescriptionInQuotes);
+    }
+
+    if (this.usageAccumulationResetFrequency != null) {
+
+      formData.put("usage_accumulation_reset_frequency", this.usageAccumulationResetFrequency);
+    }
+
+    if (this.businessEntityId != null) {
+
+      formData.put("business_entity_id", this.businessEntityId);
+    }
+
+    if (this.pricingModel != null) {
+
+      formData.put("pricing_model", this.pricingModel);
+    }
+
+    if (this.price != null) {
+
+      formData.put("price", this.price);
+    }
+
+    if (this.priceInDecimal != null) {
+
+      formData.put("price_in_decimal", this.priceInDecimal);
+    }
+
+    if (this.periodUnit != null) {
+
+      formData.put("period_unit", this.periodUnit);
+    }
+
+    if (this.period != null) {
+
+      formData.put("period", this.period);
+    }
+
+    if (this.trialPeriodUnit != null) {
+
+      formData.put("trial_period_unit", this.trialPeriodUnit);
+    }
+
+    if (this.trialPeriod != null) {
+
+      formData.put("trial_period", this.trialPeriod);
+    }
+
+    if (this.shippingPeriod != null) {
+
+      formData.put("shipping_period", this.shippingPeriod);
+    }
+
+    if (this.shippingPeriodUnit != null) {
+
+      formData.put("shipping_period_unit", this.shippingPeriodUnit);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.trialEndAction != null) {
+
+      formData.put("trial_end_action", this.trialEndAction);
+    }
+
+    if (this.taxDetail != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.taxDetail.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "tax_detail[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.accountingDetail != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.accountingDetail.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "accounting_detail[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.tiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.tiers.size(); i++) {
+        TiersParams item = this.tiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for ItemPriceCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ItemPriceCreateBuilder builder() {
+    return new ItemPriceCreateBuilder();
+  }
+
+  public static final class ItemPriceCreateBuilder {
+
+    private String id;
+
+    private String name;
+
+    private String description;
+
+    private String itemId;
+
+    private String invoiceNotes;
+
+    private ProrationType prorationType;
+
+    private String externalName;
+
+    private String currencyCode;
+
+    private String priceVariantId;
+
+    private Boolean isTaxable;
+
+    private Integer freeQuantity;
+
+    private String freeQuantityInDecimal;
+
+    private java.util.Map<String, Object> metadata;
+
+    private Boolean showDescriptionInInvoices;
+
+    private Boolean showDescriptionInQuotes;
+
+    private UsageAccumulationResetFrequency usageAccumulationResetFrequency;
+
+    private String businessEntityId;
+
+    private PricingModel pricingModel;
+
+    private Long price;
+
+    private String priceInDecimal;
+
+    private PeriodUnit periodUnit;
+
+    private Integer period;
+
+    private TrialPeriodUnit trialPeriodUnit;
+
+    private Integer trialPeriod;
+
+    private Integer shippingPeriod;
+
+    private ShippingPeriodUnit shippingPeriodUnit;
+
+    private Integer billingCycles;
+
+    private TrialEndAction trialEndAction;
+
+    private TaxDetailParams taxDetail;
+
+    private AccountingDetailParams accountingDetail;
+
+    private List<TiersParams> tiers;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private ItemPriceCreateBuilder() {}
+
+    public ItemPriceCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder itemId(String value) {
+      this.itemId = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder prorationType(ProrationType value) {
+      this.prorationType = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder externalName(String value) {
+      this.externalName = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder priceVariantId(String value) {
+      this.priceVariantId = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder isTaxable(Boolean value) {
+      this.isTaxable = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder freeQuantity(Integer value) {
+      this.freeQuantity = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder freeQuantityInDecimal(String value) {
+      this.freeQuantityInDecimal = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder metadata(java.util.Map<String, Object> value) {
+      this.metadata = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder showDescriptionInInvoices(Boolean value) {
+      this.showDescriptionInInvoices = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder showDescriptionInQuotes(Boolean value) {
+      this.showDescriptionInQuotes = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder usageAccumulationResetFrequency(
+        UsageAccumulationResetFrequency value) {
+      this.usageAccumulationResetFrequency = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder businessEntityId(String value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder pricingModel(PricingModel value) {
+      this.pricingModel = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder price(Long value) {
+      this.price = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder priceInDecimal(String value) {
+      this.priceInDecimal = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder periodUnit(PeriodUnit value) {
+      this.periodUnit = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder period(Integer value) {
+      this.period = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder trialPeriodUnit(TrialPeriodUnit value) {
+      this.trialPeriodUnit = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder trialPeriod(Integer value) {
+      this.trialPeriod = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder shippingPeriod(Integer value) {
+      this.shippingPeriod = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder shippingPeriodUnit(ShippingPeriodUnit value) {
+      this.shippingPeriodUnit = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder trialEndAction(TrialEndAction value) {
+      this.trialEndAction = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder taxDetail(TaxDetailParams value) {
+      this.taxDetail = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder accountingDetail(AccountingDetailParams value) {
+      this.accountingDetail = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder tiers(List<TiersParams> value) {
+      this.tiers = value;
+      return this;
+    }
+
+    public ItemPriceCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public ItemPriceCreateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public ItemPriceCreateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public ItemPriceCreateParams build() {
+      return new ItemPriceCreateParams(this);
+    }
+  }
+
+  public enum ProrationType {
+    SITE_DEFAULT("site_default"),
+
+    PARTIAL_TERM("partial_term"),
+
+    FULL_TERM("full_term"),
+
+    /** An enum member indicating that ProrationType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ProrationType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ProrationType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ProrationType enumValue : ProrationType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum UsageAccumulationResetFrequency {
+    NEVER("never"),
+
+    SUBSCRIPTION_BILLING_FREQUENCY("subscription_billing_frequency"),
+
+    /**
+     * An enum member indicating that UsageAccumulationResetFrequency was instantiated with an
+     * unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    UsageAccumulationResetFrequency(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static UsageAccumulationResetFrequency fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (UsageAccumulationResetFrequency enumValue : UsageAccumulationResetFrequency.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PricingModel {
+    FLAT_FEE("flat_fee"),
+
+    PER_UNIT("per_unit"),
+
+    TIERED("tiered"),
+
+    VOLUME("volume"),
+
+    STAIRSTEP("stairstep"),
+
+    /** An enum member indicating that PricingModel was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PricingModel(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PricingModel fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PricingModel enumValue : PricingModel.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PeriodUnit enumValue : PeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TrialPeriodUnit {
+    DAY("day"),
+
+    MONTH("month"),
+
+    /** An enum member indicating that TrialPeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TrialPeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TrialPeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TrialPeriodUnit enumValue : TrialPeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ShippingPeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that ShippingPeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ShippingPeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ShippingPeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ShippingPeriodUnit enumValue : ShippingPeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TrialEndAction {
+    SITE_DEFAULT("site_default"),
+
+    ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+    CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TrialEndAction(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TrialEndAction fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TrialEndAction enumValue : TrialEndAction.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class TaxDetailParams {
+
+    private final String taxProfileId;
+
+    private final String avalaraTaxCode;
+
+    private final String hsnCode;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final String taxjarProductCode;
+
+    private TaxDetailParams(TaxDetailBuilder builder) {
+
+      this.taxProfileId = builder.taxProfileId;
+
+      this.avalaraTaxCode = builder.avalaraTaxCode;
+
+      this.hsnCode = builder.hsnCode;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.taxjarProductCode = builder.taxjarProductCode;
+    }
+
+    public String getTaxProfileId() {
+      return taxProfileId;
+    }
+
+    public String getAvalaraTaxCode() {
+      return avalaraTaxCode;
+    }
+
+    public String getHsnCode() {
+      return hsnCode;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public String getTaxjarProductCode() {
+      return taxjarProductCode;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.taxProfileId != null) {
+
+        formData.put("tax_profile_id", this.taxProfileId);
+      }
+
+      if (this.avalaraTaxCode != null) {
+
+        formData.put("avalara_tax_code", this.avalaraTaxCode);
+      }
+
+      if (this.hsnCode != null) {
+
+        formData.put("hsn_code", this.hsnCode);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.taxjarProductCode != null) {
+
+        formData.put("taxjar_product_code", this.taxjarProductCode);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxDetailParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxDetailBuilder builder() {
+      return new TaxDetailBuilder();
+    }
+
+    public static final class TaxDetailBuilder {
+
+      private String taxProfileId;
+
+      private String avalaraTaxCode;
+
+      private String hsnCode;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private String taxjarProductCode;
+
+      private TaxDetailBuilder() {}
+
+      public TaxDetailBuilder taxProfileId(String value) {
+        this.taxProfileId = value;
+        return this;
+      }
+
+      public TaxDetailBuilder avalaraTaxCode(String value) {
+        this.avalaraTaxCode = value;
+        return this;
+      }
+
+      public TaxDetailBuilder hsnCode(String value) {
+        this.hsnCode = value;
+        return this;
+      }
+
+      public TaxDetailBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public TaxDetailBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public TaxDetailBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public TaxDetailBuilder taxjarProductCode(String value) {
+        this.taxjarProductCode = value;
+        return this;
+      }
+
+      public TaxDetailParams build() {
+        return new TaxDetailParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AccountingDetailParams {
+
+    private final String sku;
+
+    private final String accountingCode;
+
+    private final String accountingCategory1;
+
+    private final String accountingCategory2;
+
+    private final String accountingCategory3;
+
+    private final String accountingCategory4;
+
+    private AccountingDetailParams(AccountingDetailBuilder builder) {
+
+      this.sku = builder.sku;
+
+      this.accountingCode = builder.accountingCode;
+
+      this.accountingCategory1 = builder.accountingCategory1;
+
+      this.accountingCategory2 = builder.accountingCategory2;
+
+      this.accountingCategory3 = builder.accountingCategory3;
+
+      this.accountingCategory4 = builder.accountingCategory4;
+    }
+
+    public String getSku() {
+      return sku;
+    }
+
+    public String getAccountingCode() {
+      return accountingCode;
+    }
+
+    public String getAccountingCategory1() {
+      return accountingCategory1;
+    }
+
+    public String getAccountingCategory2() {
+      return accountingCategory2;
+    }
+
+    public String getAccountingCategory3() {
+      return accountingCategory3;
+    }
+
+    public String getAccountingCategory4() {
+      return accountingCategory4;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.sku != null) {
+
+        formData.put("sku", this.sku);
+      }
+
+      if (this.accountingCode != null) {
+
+        formData.put("accounting_code", this.accountingCode);
+      }
+
+      if (this.accountingCategory1 != null) {
+
+        formData.put("accounting_category1", this.accountingCategory1);
+      }
+
+      if (this.accountingCategory2 != null) {
+
+        formData.put("accounting_category2", this.accountingCategory2);
+      }
+
+      if (this.accountingCategory3 != null) {
+
+        formData.put("accounting_category3", this.accountingCategory3);
+      }
+
+      if (this.accountingCategory4 != null) {
+
+        formData.put("accounting_category4", this.accountingCategory4);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AccountingDetailParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AccountingDetailBuilder builder() {
+      return new AccountingDetailBuilder();
+    }
+
+    public static final class AccountingDetailBuilder {
+
+      private String sku;
+
+      private String accountingCode;
+
+      private String accountingCategory1;
+
+      private String accountingCategory2;
+
+      private String accountingCategory3;
+
+      private String accountingCategory4;
+
+      private AccountingDetailBuilder() {}
+
+      public AccountingDetailBuilder sku(String value) {
+        this.sku = value;
+        return this;
+      }
+
+      public AccountingDetailBuilder accountingCode(String value) {
+        this.accountingCode = value;
+        return this;
+      }
+
+      public AccountingDetailBuilder accountingCategory1(String value) {
+        this.accountingCategory1 = value;
+        return this;
+      }
+
+      public AccountingDetailBuilder accountingCategory2(String value) {
+        this.accountingCategory2 = value;
+        return this;
+      }
+
+      public AccountingDetailBuilder accountingCategory3(String value) {
+        this.accountingCategory3 = value;
+        return this;
+      }
+
+      public AccountingDetailBuilder accountingCategory4(String value) {
+        this.accountingCategory4 = value;
+        return this;
+      }
+
+      public AccountingDetailParams build() {
+        return new AccountingDetailParams(this);
+      }
+    }
+  }
+
+  public static final class TiersParams {
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private TiersParams(TiersBuilder builder) {
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TiersBuilder builder() {
+      return new TiersBuilder();
+    }
+
+    public static final class TiersBuilder {
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private TiersBuilder() {}
+
+      public TiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public TiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public TiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public TiersParams build() {
+        return new TiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceDeleteParams.java b/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceDeleteParams.java
index 54866475..80523762 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceDeleteParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.itemPrice.params;
+package com.chargebee.v4.models.itemPrice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class ItemPriceDeleteParams {
 
-  private final Map<String, Object> formData;
-
-  private ItemPriceDeleteParams(ItemPriceDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private ItemPriceDeleteParams(ItemPriceDeleteBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static ItemPriceDeleteBuilder builder() {
   }
 
   public static final class ItemPriceDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private ItemPriceDeleteBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceFindApplicableItemsParams.java b/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceFindApplicableItemsParams.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceFindApplicableItemsParams.java
rename to src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceFindApplicableItemsParams.java
index 3917a020..a62f1ce0 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceFindApplicableItemsParams.java
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceFindApplicableItemsParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemPrice.params;
+package com.chargebee.v4.models.itemPrice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceListParams.java b/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceListParams.java
rename to src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceListParams.java
index c0d6f5c9..00dc5a7c 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceListParams.java
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemPrice.params;
+package com.chargebee.v4.models.itemPrice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceRetrieveParams.java b/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceRetrieveParams.java
index 1005947b..424fe08c 100644
--- a/src/main/java/com/chargebee/v4/core/models/itemPrice/params/ItemPriceRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.itemPrice.params;
+package com.chargebee.v4.models.itemPrice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceUpdateParams.java b/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceUpdateParams.java
new file mode 100644
index 00000000..2adddb04
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/params/ItemPriceUpdateParams.java
@@ -0,0 +1,1624 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.itemPrice.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class ItemPriceUpdateParams {
+
+  private final String name;
+
+  private final String description;
+
+  private final ProrationType prorationType;
+
+  private final String priceVariantId;
+
+  private final Status status;
+
+  private final String externalName;
+
+  private final UsageAccumulationResetFrequency usageAccumulationResetFrequency;
+
+  private final String currencyCode;
+
+  private final String invoiceNotes;
+
+  private final Boolean isTaxable;
+
+  private final Integer freeQuantity;
+
+  private final String freeQuantityInDecimal;
+
+  private final java.util.Map<String, Object> metadata;
+
+  private final PricingModel pricingModel;
+
+  private final Long price;
+
+  private final String priceInDecimal;
+
+  private final PeriodUnit periodUnit;
+
+  private final Integer period;
+
+  private final TrialPeriodUnit trialPeriodUnit;
+
+  private final Integer trialPeriod;
+
+  private final Integer shippingPeriod;
+
+  private final ShippingPeriodUnit shippingPeriodUnit;
+
+  private final Integer billingCycles;
+
+  private final TrialEndAction trialEndAction;
+
+  private final Boolean showDescriptionInInvoices;
+
+  private final Boolean showDescriptionInQuotes;
+
+  private final TaxDetailParams taxDetail;
+
+  private final AccountingDetailParams accountingDetail;
+
+  private final List<TiersParams> tiers;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private final Map<String, String> customFields;
+
+  private ItemPriceUpdateParams(ItemPriceUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.description = builder.description;
+
+    this.prorationType = builder.prorationType;
+
+    this.priceVariantId = builder.priceVariantId;
+
+    this.status = builder.status;
+
+    this.externalName = builder.externalName;
+
+    this.usageAccumulationResetFrequency = builder.usageAccumulationResetFrequency;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.isTaxable = builder.isTaxable;
+
+    this.freeQuantity = builder.freeQuantity;
+
+    this.freeQuantityInDecimal = builder.freeQuantityInDecimal;
+
+    this.metadata = builder.metadata;
+
+    this.pricingModel = builder.pricingModel;
+
+    this.price = builder.price;
+
+    this.priceInDecimal = builder.priceInDecimal;
+
+    this.periodUnit = builder.periodUnit;
+
+    this.period = builder.period;
+
+    this.trialPeriodUnit = builder.trialPeriodUnit;
+
+    this.trialPeriod = builder.trialPeriod;
+
+    this.shippingPeriod = builder.shippingPeriod;
+
+    this.shippingPeriodUnit = builder.shippingPeriodUnit;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.trialEndAction = builder.trialEndAction;
+
+    this.showDescriptionInInvoices = builder.showDescriptionInInvoices;
+
+    this.showDescriptionInQuotes = builder.showDescriptionInQuotes;
+
+    this.taxDetail = builder.taxDetail;
+
+    this.accountingDetail = builder.accountingDetail;
+
+    this.tiers = builder.tiers;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public ProrationType getProrationType() {
+    return prorationType;
+  }
+
+  public String getPriceVariantId() {
+    return priceVariantId;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public String getExternalName() {
+    return externalName;
+  }
+
+  public UsageAccumulationResetFrequency getUsageAccumulationResetFrequency() {
+    return usageAccumulationResetFrequency;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public Boolean getIsTaxable() {
+    return isTaxable;
+  }
+
+  public Integer getFreeQuantity() {
+    return freeQuantity;
+  }
+
+  public String getFreeQuantityInDecimal() {
+    return freeQuantityInDecimal;
+  }
+
+  public java.util.Map<String, Object> getMetadata() {
+    return metadata;
+  }
+
+  public PricingModel getPricingModel() {
+    return pricingModel;
+  }
+
+  public Long getPrice() {
+    return price;
+  }
+
+  public String getPriceInDecimal() {
+    return priceInDecimal;
+  }
+
+  public PeriodUnit getPeriodUnit() {
+    return periodUnit;
+  }
+
+  public Integer getPeriod() {
+    return period;
+  }
+
+  public TrialPeriodUnit getTrialPeriodUnit() {
+    return trialPeriodUnit;
+  }
+
+  public Integer getTrialPeriod() {
+    return trialPeriod;
+  }
+
+  public Integer getShippingPeriod() {
+    return shippingPeriod;
+  }
+
+  public ShippingPeriodUnit getShippingPeriodUnit() {
+    return shippingPeriodUnit;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public TrialEndAction getTrialEndAction() {
+    return trialEndAction;
+  }
+
+  public Boolean getShowDescriptionInInvoices() {
+    return showDescriptionInInvoices;
+  }
+
+  public Boolean getShowDescriptionInQuotes() {
+    return showDescriptionInQuotes;
+  }
+
+  public TaxDetailParams getTaxDetail() {
+    return taxDetail;
+  }
+
+  public AccountingDetailParams getAccountingDetail() {
+    return accountingDetail;
+  }
+
+  public List<TiersParams> getTiers() {
+    return tiers;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.prorationType != null) {
+
+      formData.put("proration_type", this.prorationType);
+    }
+
+    if (this.priceVariantId != null) {
+
+      formData.put("price_variant_id", this.priceVariantId);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.externalName != null) {
+
+      formData.put("external_name", this.externalName);
+    }
+
+    if (this.usageAccumulationResetFrequency != null) {
+
+      formData.put("usage_accumulation_reset_frequency", this.usageAccumulationResetFrequency);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.isTaxable != null) {
+
+      formData.put("is_taxable", this.isTaxable);
+    }
+
+    if (this.freeQuantity != null) {
+
+      formData.put("free_quantity", this.freeQuantity);
+    }
+
+    if (this.freeQuantityInDecimal != null) {
+
+      formData.put("free_quantity_in_decimal", this.freeQuantityInDecimal);
+    }
+
+    if (this.metadata != null) {
+
+      formData.put("metadata", JsonUtil.toJson(this.metadata));
+    }
+
+    if (this.pricingModel != null) {
+
+      formData.put("pricing_model", this.pricingModel);
+    }
+
+    if (this.price != null) {
+
+      formData.put("price", this.price);
+    }
+
+    if (this.priceInDecimal != null) {
+
+      formData.put("price_in_decimal", this.priceInDecimal);
+    }
+
+    if (this.periodUnit != null) {
+
+      formData.put("period_unit", this.periodUnit);
+    }
+
+    if (this.period != null) {
+
+      formData.put("period", this.period);
+    }
+
+    if (this.trialPeriodUnit != null) {
+
+      formData.put("trial_period_unit", this.trialPeriodUnit);
+    }
+
+    if (this.trialPeriod != null) {
+
+      formData.put("trial_period", this.trialPeriod);
+    }
+
+    if (this.shippingPeriod != null) {
+
+      formData.put("shipping_period", this.shippingPeriod);
+    }
+
+    if (this.shippingPeriodUnit != null) {
+
+      formData.put("shipping_period_unit", this.shippingPeriodUnit);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.trialEndAction != null) {
+
+      formData.put("trial_end_action", this.trialEndAction);
+    }
+
+    if (this.showDescriptionInInvoices != null) {
+
+      formData.put("show_description_in_invoices", this.showDescriptionInInvoices);
+    }
+
+    if (this.showDescriptionInQuotes != null) {
+
+      formData.put("show_description_in_quotes", this.showDescriptionInQuotes);
+    }
+
+    if (this.taxDetail != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.taxDetail.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "tax_detail[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.accountingDetail != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.accountingDetail.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "accounting_detail[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.tiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.tiers.size(); i++) {
+        TiersParams item = this.tiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for ItemPriceUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ItemPriceUpdateBuilder builder() {
+    return new ItemPriceUpdateBuilder();
+  }
+
+  public static final class ItemPriceUpdateBuilder {
+
+    private String name;
+
+    private String description;
+
+    private ProrationType prorationType;
+
+    private String priceVariantId;
+
+    private Status status;
+
+    private String externalName;
+
+    private UsageAccumulationResetFrequency usageAccumulationResetFrequency;
+
+    private String currencyCode;
+
+    private String invoiceNotes;
+
+    private Boolean isTaxable;
+
+    private Integer freeQuantity;
+
+    private String freeQuantityInDecimal;
+
+    private java.util.Map<String, Object> metadata;
+
+    private PricingModel pricingModel;
+
+    private Long price;
+
+    private String priceInDecimal;
+
+    private PeriodUnit periodUnit;
+
+    private Integer period;
+
+    private TrialPeriodUnit trialPeriodUnit;
+
+    private Integer trialPeriod;
+
+    private Integer shippingPeriod;
+
+    private ShippingPeriodUnit shippingPeriodUnit;
+
+    private Integer billingCycles;
+
+    private TrialEndAction trialEndAction;
+
+    private Boolean showDescriptionInInvoices;
+
+    private Boolean showDescriptionInQuotes;
+
+    private TaxDetailParams taxDetail;
+
+    private AccountingDetailParams accountingDetail;
+
+    private List<TiersParams> tiers;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private ItemPriceUpdateBuilder() {}
+
+    public ItemPriceUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder prorationType(ProrationType value) {
+      this.prorationType = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder priceVariantId(String value) {
+      this.priceVariantId = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder externalName(String value) {
+      this.externalName = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder usageAccumulationResetFrequency(
+        UsageAccumulationResetFrequency value) {
+      this.usageAccumulationResetFrequency = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder isTaxable(Boolean value) {
+      this.isTaxable = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder freeQuantity(Integer value) {
+      this.freeQuantity = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder freeQuantityInDecimal(String value) {
+      this.freeQuantityInDecimal = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder metadata(java.util.Map<String, Object> value) {
+      this.metadata = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder pricingModel(PricingModel value) {
+      this.pricingModel = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder price(Long value) {
+      this.price = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder priceInDecimal(String value) {
+      this.priceInDecimal = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder periodUnit(PeriodUnit value) {
+      this.periodUnit = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder period(Integer value) {
+      this.period = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder trialPeriodUnit(TrialPeriodUnit value) {
+      this.trialPeriodUnit = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder trialPeriod(Integer value) {
+      this.trialPeriod = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder shippingPeriod(Integer value) {
+      this.shippingPeriod = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder shippingPeriodUnit(ShippingPeriodUnit value) {
+      this.shippingPeriodUnit = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder trialEndAction(TrialEndAction value) {
+      this.trialEndAction = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder showDescriptionInInvoices(Boolean value) {
+      this.showDescriptionInInvoices = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder showDescriptionInQuotes(Boolean value) {
+      this.showDescriptionInQuotes = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder taxDetail(TaxDetailParams value) {
+      this.taxDetail = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder accountingDetail(AccountingDetailParams value) {
+      this.accountingDetail = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder tiers(List<TiersParams> value) {
+      this.tiers = value;
+      return this;
+    }
+
+    public ItemPriceUpdateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public ItemPriceUpdateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public ItemPriceUpdateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public ItemPriceUpdateParams build() {
+      return new ItemPriceUpdateParams(this);
+    }
+  }
+
+  public enum ProrationType {
+    SITE_DEFAULT("site_default"),
+
+    PARTIAL_TERM("partial_term"),
+
+    FULL_TERM("full_term"),
+
+    /** An enum member indicating that ProrationType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ProrationType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ProrationType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ProrationType enumValue : ProrationType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Status {
+    ACTIVE("active"),
+
+    ARCHIVED("archived"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum UsageAccumulationResetFrequency {
+    NEVER("never"),
+
+    SUBSCRIPTION_BILLING_FREQUENCY("subscription_billing_frequency"),
+
+    /**
+     * An enum member indicating that UsageAccumulationResetFrequency was instantiated with an
+     * unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    UsageAccumulationResetFrequency(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static UsageAccumulationResetFrequency fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (UsageAccumulationResetFrequency enumValue : UsageAccumulationResetFrequency.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PricingModel {
+    FLAT_FEE("flat_fee"),
+
+    PER_UNIT("per_unit"),
+
+    TIERED("tiered"),
+
+    VOLUME("volume"),
+
+    STAIRSTEP("stairstep"),
+
+    /** An enum member indicating that PricingModel was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PricingModel(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PricingModel fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PricingModel enumValue : PricingModel.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PeriodUnit enumValue : PeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TrialPeriodUnit {
+    DAY("day"),
+
+    MONTH("month"),
+
+    /** An enum member indicating that TrialPeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TrialPeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TrialPeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TrialPeriodUnit enumValue : TrialPeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ShippingPeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that ShippingPeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ShippingPeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ShippingPeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ShippingPeriodUnit enumValue : ShippingPeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TrialEndAction {
+    SITE_DEFAULT("site_default"),
+
+    ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+    CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TrialEndAction(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TrialEndAction fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TrialEndAction enumValue : TrialEndAction.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class TaxDetailParams {
+
+    private final String taxProfileId;
+
+    private final String avalaraTaxCode;
+
+    private final String hsnCode;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final String taxjarProductCode;
+
+    private TaxDetailParams(TaxDetailBuilder builder) {
+
+      this.taxProfileId = builder.taxProfileId;
+
+      this.avalaraTaxCode = builder.avalaraTaxCode;
+
+      this.hsnCode = builder.hsnCode;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.taxjarProductCode = builder.taxjarProductCode;
+    }
+
+    public String getTaxProfileId() {
+      return taxProfileId;
+    }
+
+    public String getAvalaraTaxCode() {
+      return avalaraTaxCode;
+    }
+
+    public String getHsnCode() {
+      return hsnCode;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public String getTaxjarProductCode() {
+      return taxjarProductCode;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.taxProfileId != null) {
+
+        formData.put("tax_profile_id", this.taxProfileId);
+      }
+
+      if (this.avalaraTaxCode != null) {
+
+        formData.put("avalara_tax_code", this.avalaraTaxCode);
+      }
+
+      if (this.hsnCode != null) {
+
+        formData.put("hsn_code", this.hsnCode);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.taxjarProductCode != null) {
+
+        formData.put("taxjar_product_code", this.taxjarProductCode);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxDetailParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxDetailBuilder builder() {
+      return new TaxDetailBuilder();
+    }
+
+    public static final class TaxDetailBuilder {
+
+      private String taxProfileId;
+
+      private String avalaraTaxCode;
+
+      private String hsnCode;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private String taxjarProductCode;
+
+      private TaxDetailBuilder() {}
+
+      public TaxDetailBuilder taxProfileId(String value) {
+        this.taxProfileId = value;
+        return this;
+      }
+
+      public TaxDetailBuilder avalaraTaxCode(String value) {
+        this.avalaraTaxCode = value;
+        return this;
+      }
+
+      public TaxDetailBuilder hsnCode(String value) {
+        this.hsnCode = value;
+        return this;
+      }
+
+      public TaxDetailBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public TaxDetailBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public TaxDetailBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public TaxDetailBuilder taxjarProductCode(String value) {
+        this.taxjarProductCode = value;
+        return this;
+      }
+
+      public TaxDetailParams build() {
+        return new TaxDetailParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AccountingDetailParams {
+
+    private final String sku;
+
+    private final String accountingCode;
+
+    private final String accountingCategory1;
+
+    private final String accountingCategory2;
+
+    private final String accountingCategory3;
+
+    private final String accountingCategory4;
+
+    private AccountingDetailParams(AccountingDetailBuilder builder) {
+
+      this.sku = builder.sku;
+
+      this.accountingCode = builder.accountingCode;
+
+      this.accountingCategory1 = builder.accountingCategory1;
+
+      this.accountingCategory2 = builder.accountingCategory2;
+
+      this.accountingCategory3 = builder.accountingCategory3;
+
+      this.accountingCategory4 = builder.accountingCategory4;
+    }
+
+    public String getSku() {
+      return sku;
+    }
+
+    public String getAccountingCode() {
+      return accountingCode;
+    }
+
+    public String getAccountingCategory1() {
+      return accountingCategory1;
+    }
+
+    public String getAccountingCategory2() {
+      return accountingCategory2;
+    }
+
+    public String getAccountingCategory3() {
+      return accountingCategory3;
+    }
+
+    public String getAccountingCategory4() {
+      return accountingCategory4;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.sku != null) {
+
+        formData.put("sku", this.sku);
+      }
+
+      if (this.accountingCode != null) {
+
+        formData.put("accounting_code", this.accountingCode);
+      }
+
+      if (this.accountingCategory1 != null) {
+
+        formData.put("accounting_category1", this.accountingCategory1);
+      }
+
+      if (this.accountingCategory2 != null) {
+
+        formData.put("accounting_category2", this.accountingCategory2);
+      }
+
+      if (this.accountingCategory3 != null) {
+
+        formData.put("accounting_category3", this.accountingCategory3);
+      }
+
+      if (this.accountingCategory4 != null) {
+
+        formData.put("accounting_category4", this.accountingCategory4);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AccountingDetailParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AccountingDetailBuilder builder() {
+      return new AccountingDetailBuilder();
+    }
+
+    public static final class AccountingDetailBuilder {
+
+      private String sku;
+
+      private String accountingCode;
+
+      private String accountingCategory1;
+
+      private String accountingCategory2;
+
+      private String accountingCategory3;
+
+      private String accountingCategory4;
+
+      private AccountingDetailBuilder() {}
+
+      public AccountingDetailBuilder sku(String value) {
+        this.sku = value;
+        return this;
+      }
+
+      public AccountingDetailBuilder accountingCode(String value) {
+        this.accountingCode = value;
+        return this;
+      }
+
+      public AccountingDetailBuilder accountingCategory1(String value) {
+        this.accountingCategory1 = value;
+        return this;
+      }
+
+      public AccountingDetailBuilder accountingCategory2(String value) {
+        this.accountingCategory2 = value;
+        return this;
+      }
+
+      public AccountingDetailBuilder accountingCategory3(String value) {
+        this.accountingCategory3 = value;
+        return this;
+      }
+
+      public AccountingDetailBuilder accountingCategory4(String value) {
+        this.accountingCategory4 = value;
+        return this;
+      }
+
+      public AccountingDetailParams build() {
+        return new AccountingDetailParams(this);
+      }
+    }
+  }
+
+  public static final class TiersParams {
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private TiersParams(TiersBuilder builder) {
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TiersBuilder builder() {
+      return new TiersBuilder();
+    }
+
+    public static final class TiersBuilder {
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private TiersBuilder() {}
+
+      public TiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public TiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public TiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public TiersParams build() {
+        return new TiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/itemPrice/params/MoveItemPriceParams.java b/src/main/java/com/chargebee/v4/models/itemPrice/params/MoveItemPriceParams.java
new file mode 100644
index 00000000..d9db9dfe
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/params/MoveItemPriceParams.java
@@ -0,0 +1,80 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.itemPrice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class MoveItemPriceParams {
+
+  private final String destinationItemId;
+
+  private final String variantId;
+
+  private MoveItemPriceParams(MoveItemPriceBuilder builder) {
+
+    this.destinationItemId = builder.destinationItemId;
+
+    this.variantId = builder.variantId;
+  }
+
+  public String getDestinationItemId() {
+    return destinationItemId;
+  }
+
+  public String getVariantId() {
+    return variantId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.destinationItemId != null) {
+
+      formData.put("destination_item_id", this.destinationItemId);
+    }
+
+    if (this.variantId != null) {
+
+      formData.put("variant_id", this.variantId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for MoveItemPriceParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static MoveItemPriceBuilder builder() {
+    return new MoveItemPriceBuilder();
+  }
+
+  public static final class MoveItemPriceBuilder {
+
+    private String destinationItemId;
+
+    private String variantId;
+
+    private MoveItemPriceBuilder() {}
+
+    public MoveItemPriceBuilder destinationItemId(String value) {
+      this.destinationItemId = value;
+      return this;
+    }
+
+    public MoveItemPriceBuilder variantId(String value) {
+      this.variantId = value;
+      return this;
+    }
+
+    public MoveItemPriceParams build() {
+      return new MoveItemPriceParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/itemPrice/responses/FindApplicableItemPricesResponse.java b/src/main/java/com/chargebee/v4/models/itemPrice/responses/FindApplicableItemPricesResponse.java
new file mode 100644
index 00000000..c9278069
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/responses/FindApplicableItemPricesResponse.java
@@ -0,0 +1,176 @@
+package com.chargebee.v4.models.itemPrice.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.itemPrice.ItemPrice;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.ItemPriceService;
+import com.chargebee.v4.models.itemPrice.params.FindApplicableItemPricesParams;
+
+/**
+ * Immutable response object for FindApplicableItemPrices operation. Contains paginated list data.
+ */
+public final class FindApplicableItemPricesResponse {
+
+  private final List<ItemPriceFindApplicableItemPricesItem> list;
+
+  private final String nextOffset;
+
+  private final String itemPriceId;
+
+  private final ItemPriceService service;
+  private final FindApplicableItemPricesParams originalParams;
+  private final Response httpResponse;
+
+  private FindApplicableItemPricesResponse(
+      List<ItemPriceFindApplicableItemPricesItem> list,
+      String nextOffset,
+      String itemPriceId,
+      ItemPriceService service,
+      FindApplicableItemPricesParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.itemPriceId = itemPriceId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into FindApplicableItemPricesResponse object (no service context). Use this
+   * when you only need to read a single page (no nextPage()).
+   */
+  public static FindApplicableItemPricesResponse fromJson(String json) {
+    try {
+
+      List<ItemPriceFindApplicableItemPricesItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(ItemPriceFindApplicableItemPricesItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new FindApplicableItemPricesResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse FindApplicableItemPricesResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into FindApplicableItemPricesResponse object with service context for
+   * pagination (enables nextPage()).
+   */
+  public static FindApplicableItemPricesResponse fromJson(
+      String json,
+      ItemPriceService service,
+      FindApplicableItemPricesParams originalParams,
+      String itemPriceId,
+      Response httpResponse) {
+    try {
+
+      List<ItemPriceFindApplicableItemPricesItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(ItemPriceFindApplicableItemPricesItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new FindApplicableItemPricesResponse(
+          list, nextOffset, itemPriceId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse FindApplicableItemPricesResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<ItemPriceFindApplicableItemPricesItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public FindApplicableItemPricesResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    FindApplicableItemPricesParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : FindApplicableItemPricesParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.findApplicableItemPrices(itemPriceId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class ItemPriceFindApplicableItemPricesItem {
+
+    private ItemPrice itemPrice;
+
+    public ItemPrice getItemPrice() {
+      return itemPrice;
+    }
+
+    public static ItemPriceFindApplicableItemPricesItem fromJson(String json) {
+      ItemPriceFindApplicableItemPricesItem item = new ItemPriceFindApplicableItemPricesItem();
+
+      String __itemPriceJson = JsonUtil.getObject(json, "item_price");
+      if (__itemPriceJson != null) {
+        item.itemPrice = ItemPrice.fromJson(__itemPriceJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceCreateResponse.java b/src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceCreateResponse.java
index 3efdd774..13be2551 100644
--- a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.itemPrice;
+package com.chargebee.v4.models.itemPrice.responses;
 
-import com.chargebee.v4.core.models.itemPrice.ItemPrice;
+import com.chargebee.v4.models.itemPrice.ItemPrice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceDeleteResponse.java b/src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceDeleteResponse.java
index ec171eac..d024e354 100644
--- a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.itemPrice;
+package com.chargebee.v4.models.itemPrice.responses;
 
-import com.chargebee.v4.core.models.itemPrice.ItemPrice;
+import com.chargebee.v4.models.itemPrice.ItemPrice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceFindApplicableItemsResponse.java b/src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceFindApplicableItemsResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceFindApplicableItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceFindApplicableItemsResponse.java
index 56d9db6f..ebc6fbd3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceFindApplicableItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceFindApplicableItemsResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.itemPrice;
+package com.chargebee.v4.models.itemPrice.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.item.Item;
+import com.chargebee.v4.models.item.Item;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.ItemPriceService;
-import com.chargebee.v4.core.models.itemPrice.params.ItemPriceFindApplicableItemsParams;
+import com.chargebee.v4.services.ItemPriceService;
+import com.chargebee.v4.models.itemPrice.params.ItemPriceFindApplicableItemsParams;
 
 /**
  * Immutable response object for ItemPriceFindApplicableItems operation. Contains paginated list
@@ -110,9 +111,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public ItemPriceFindApplicableItemsResponse nextPage() throws Exception {
+  public ItemPriceFindApplicableItemsResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceListResponse.java b/src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceListResponse.java
rename to src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceListResponse.java
index a2a22621..4bc936ac 100644
--- a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.itemPrice;
+package com.chargebee.v4.models.itemPrice.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.itemPrice.ItemPrice;
+import com.chargebee.v4.models.itemPrice.ItemPrice;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.ItemPriceService;
-import com.chargebee.v4.core.models.itemPrice.params.ItemPriceListParams;
+import com.chargebee.v4.services.ItemPriceService;
+import com.chargebee.v4.models.itemPrice.params.ItemPriceListParams;
 
 /** Immutable response object for ItemPriceList operation. Contains paginated list data. */
 public final class ItemPriceListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public ItemPriceListResponse nextPage() throws Exception {
+  public ItemPriceListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceRetrieveResponse.java
new file mode 100644
index 00000000..a259aaee
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.itemPrice.responses;
+
+import com.chargebee.v4.models.itemPrice.ItemPrice;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ItemPriceRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class ItemPriceRetrieveResponse extends BaseResponse {
+  private final ItemPrice itemPrice;
+
+  private ItemPriceRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.itemPrice = builder.itemPrice;
+  }
+
+  /** Parse JSON response into ItemPriceRetrieveResponse object. */
+  public static ItemPriceRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ItemPriceRetrieveResponse object with HTTP response. */
+  public static ItemPriceRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __itemPriceJson = JsonUtil.getObject(json, "item_price");
+      if (__itemPriceJson != null) {
+        builder.itemPrice(ItemPrice.fromJson(__itemPriceJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ItemPriceRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ItemPriceRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ItemPriceRetrieveResponse. */
+  public static class Builder {
+
+    private ItemPrice itemPrice;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder itemPrice(ItemPrice itemPrice) {
+      this.itemPrice = itemPrice;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ItemPriceRetrieveResponse build() {
+      return new ItemPriceRetrieveResponse(this);
+    }
+  }
+
+  /** Get the itemPrice from the response. */
+  public ItemPrice getItemPrice() {
+    return itemPrice;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceUpdateResponse.java b/src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceUpdateResponse.java
index 86c4a0a2..a42e2427 100644
--- a/src/main/java/com/chargebee/v4/core/responses/itemPrice/ItemPriceUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.itemPrice;
+package com.chargebee.v4.models.itemPrice.responses;
 
-import com.chargebee.v4.core.models.itemPrice.ItemPrice;
+import com.chargebee.v4.models.itemPrice.ItemPrice;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/itemPrice/responses/MoveItemPriceResponse.java b/src/main/java/com/chargebee/v4/models/itemPrice/responses/MoveItemPriceResponse.java
new file mode 100644
index 00000000..0aa1b7cb
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/itemPrice/responses/MoveItemPriceResponse.java
@@ -0,0 +1,76 @@
+package com.chargebee.v4.models.itemPrice.responses;
+
+import com.chargebee.v4.models.itemPrice.ItemPrice;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for MoveItemPrice operation. Contains the response data from the API.
+ */
+public final class MoveItemPriceResponse extends BaseResponse {
+  private final ItemPrice itemPrice;
+
+  private MoveItemPriceResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.itemPrice = builder.itemPrice;
+  }
+
+  /** Parse JSON response into MoveItemPriceResponse object. */
+  public static MoveItemPriceResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into MoveItemPriceResponse object with HTTP response. */
+  public static MoveItemPriceResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __itemPriceJson = JsonUtil.getObject(json, "item_price");
+      if (__itemPriceJson != null) {
+        builder.itemPrice(ItemPrice.fromJson(__itemPriceJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse MoveItemPriceResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for MoveItemPriceResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for MoveItemPriceResponse. */
+  public static class Builder {
+
+    private ItemPrice itemPrice;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder itemPrice(ItemPrice itemPrice) {
+      this.itemPrice = itemPrice;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public MoveItemPriceResponse build() {
+      return new MoveItemPriceResponse(this);
+    }
+  }
+
+  /** Get the itemPrice from the response. */
+  public ItemPrice getItemPrice() {
+    return itemPrice;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/media/Media.java b/src/main/java/com/chargebee/v4/models/media/Media.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/media/Media.java
rename to src/main/java/com/chargebee/v4/models/media/Media.java
index 2761a0a8..11d3096c 100644
--- a/src/main/java/com/chargebee/v4/core/models/media/Media.java
+++ b/src/main/java/com/chargebee/v4/models/media/Media.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.media;
+package com.chargebee.v4.models.media;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/models/media/params/CreateMediaAndAttachToItemParams.java b/src/main/java/com/chargebee/v4/models/media/params/CreateMediaAndAttachToItemParams.java
new file mode 100644
index 00000000..92dba1a0
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/media/params/CreateMediaAndAttachToItemParams.java
@@ -0,0 +1,100 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.media.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CreateMediaAndAttachToItemParams {
+
+  private final String url;
+
+  private final String id;
+
+  private final String altText;
+
+  private CreateMediaAndAttachToItemParams(CreateMediaAndAttachToItemBuilder builder) {
+
+    this.url = builder.url;
+
+    this.id = builder.id;
+
+    this.altText = builder.altText;
+  }
+
+  public String getUrl() {
+    return url;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getAltText() {
+    return altText;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.url != null) {
+
+      formData.put("url", this.url);
+    }
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.altText != null) {
+
+      formData.put("alt_text", this.altText);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CreateMediaAndAttachToItemParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreateMediaAndAttachToItemBuilder builder() {
+    return new CreateMediaAndAttachToItemBuilder();
+  }
+
+  public static final class CreateMediaAndAttachToItemBuilder {
+
+    private String url;
+
+    private String id;
+
+    private String altText;
+
+    private CreateMediaAndAttachToItemBuilder() {}
+
+    public CreateMediaAndAttachToItemBuilder url(String value) {
+      this.url = value;
+      return this;
+    }
+
+    public CreateMediaAndAttachToItemBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public CreateMediaAndAttachToItemBuilder altText(String value) {
+      this.altText = value;
+      return this;
+    }
+
+    public CreateMediaAndAttachToItemParams build() {
+      return new CreateMediaAndAttachToItemParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/media/responses/CreateMediaAndAttachToItemResponse.java b/src/main/java/com/chargebee/v4/models/media/responses/CreateMediaAndAttachToItemResponse.java
new file mode 100644
index 00000000..61eaf760
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/media/responses/CreateMediaAndAttachToItemResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.media.responses;
+
+import com.chargebee.v4.models.media.Media;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CreateMediaAndAttachToItem operation. Contains the response data
+ * from the API.
+ */
+public final class CreateMediaAndAttachToItemResponse extends BaseResponse {
+  private final Media media;
+
+  private CreateMediaAndAttachToItemResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.media = builder.media;
+  }
+
+  /** Parse JSON response into CreateMediaAndAttachToItemResponse object. */
+  public static CreateMediaAndAttachToItemResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CreateMediaAndAttachToItemResponse object with HTTP response. */
+  public static CreateMediaAndAttachToItemResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __mediaJson = JsonUtil.getObject(json, "media");
+      if (__mediaJson != null) {
+        builder.media(Media.fromJson(__mediaJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CreateMediaAndAttachToItemResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CreateMediaAndAttachToItemResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CreateMediaAndAttachToItemResponse. */
+  public static class Builder {
+
+    private Media media;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder media(Media media) {
+      this.media = media;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CreateMediaAndAttachToItemResponse build() {
+      return new CreateMediaAndAttachToItemResponse(this);
+    }
+  }
+
+  /** Get the media from the response. */
+  public Media getMedia() {
+    return media;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/metadata/Metadata.java b/src/main/java/com/chargebee/v4/models/metadata/Metadata.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/metadata/Metadata.java
rename to src/main/java/com/chargebee/v4/models/metadata/Metadata.java
index 49bff199..9f6dfd5f 100644
--- a/src/main/java/com/chargebee/v4/core/models/metadata/Metadata.java
+++ b/src/main/java/com/chargebee/v4/models/metadata/Metadata.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.metadata;
+package com.chargebee.v4.models.metadata;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/nonSubscription/NonSubscription.java b/src/main/java/com/chargebee/v4/models/nonSubscription/NonSubscription.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/nonSubscription/NonSubscription.java
rename to src/main/java/com/chargebee/v4/models/nonSubscription/NonSubscription.java
index 14fbffe6..beebf06d 100644
--- a/src/main/java/com/chargebee/v4/core/models/nonSubscription/NonSubscription.java
+++ b/src/main/java/com/chargebee/v4/models/nonSubscription/NonSubscription.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.nonSubscription;
+package com.chargebee.v4.models.nonSubscription;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/models/nonSubscription/params/NonSubscriptionProcessReceiptParams.java b/src/main/java/com/chargebee/v4/models/nonSubscription/params/NonSubscriptionProcessReceiptParams.java
new file mode 100644
index 00000000..aae053b3
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/nonSubscription/params/NonSubscriptionProcessReceiptParams.java
@@ -0,0 +1,396 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.nonSubscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class NonSubscriptionProcessReceiptParams {
+
+  private final String receipt;
+
+  private final ProductParams product;
+
+  private final CustomerParams customer;
+
+  private NonSubscriptionProcessReceiptParams(NonSubscriptionProcessReceiptBuilder builder) {
+
+    this.receipt = builder.receipt;
+
+    this.product = builder.product;
+
+    this.customer = builder.customer;
+  }
+
+  public String getReceipt() {
+    return receipt;
+  }
+
+  public ProductParams getProduct() {
+    return product;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.receipt != null) {
+
+      formData.put("receipt", this.receipt);
+    }
+
+    if (this.product != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.product.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "product[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for NonSubscriptionProcessReceiptParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static NonSubscriptionProcessReceiptBuilder builder() {
+    return new NonSubscriptionProcessReceiptBuilder();
+  }
+
+  public static final class NonSubscriptionProcessReceiptBuilder {
+
+    private String receipt;
+
+    private ProductParams product;
+
+    private CustomerParams customer;
+
+    private NonSubscriptionProcessReceiptBuilder() {}
+
+    public NonSubscriptionProcessReceiptBuilder receipt(String value) {
+      this.receipt = value;
+      return this;
+    }
+
+    public NonSubscriptionProcessReceiptBuilder product(ProductParams value) {
+      this.product = value;
+      return this;
+    }
+
+    public NonSubscriptionProcessReceiptBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public NonSubscriptionProcessReceiptParams build() {
+      return new NonSubscriptionProcessReceiptParams(this);
+    }
+  }
+
+  public static final class ProductParams {
+
+    private final String id;
+
+    private final String currencyCode;
+
+    private final Integer price;
+
+    private final Type type;
+
+    private final String name;
+
+    private final String priceInDecimal;
+
+    private ProductParams(ProductBuilder builder) {
+
+      this.id = builder.id;
+
+      this.currencyCode = builder.currencyCode;
+
+      this.price = builder.price;
+
+      this.type = builder.type;
+
+      this.name = builder.name;
+
+      this.priceInDecimal = builder.priceInDecimal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getCurrencyCode() {
+      return currencyCode;
+    }
+
+    public Integer getPrice() {
+      return price;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    public String getName() {
+      return name;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.currencyCode != null) {
+
+        formData.put("currency_code", this.currencyCode);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      if (this.name != null) {
+
+        formData.put("name", this.name);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ProductParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ProductBuilder builder() {
+      return new ProductBuilder();
+    }
+
+    public static final class ProductBuilder {
+
+      private String id;
+
+      private String currencyCode;
+
+      private Integer price;
+
+      private Type type;
+
+      private String name;
+
+      private String priceInDecimal;
+
+      private ProductBuilder() {}
+
+      public ProductBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public ProductBuilder currencyCode(String value) {
+        this.currencyCode = value;
+        return this;
+      }
+
+      public ProductBuilder price(Integer value) {
+        this.price = value;
+        return this;
+      }
+
+      public ProductBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      public ProductBuilder name(String value) {
+        this.name = value;
+        return this;
+      }
+
+      public ProductBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ProductParams build() {
+        return new ProductParams(this);
+      }
+    }
+
+    public enum Type {
+      CONSUMABLE("consumable"),
+
+      NON_CONSUMABLE("non_consumable"),
+
+      NON_RENEWING_SUBSCRIPTION("non_renewing_subscription"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private final String email;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.email = builder.email;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private String email;
+
+      private String firstName;
+
+      private String lastName;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CustomerBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/nonSubscription/NonSubscriptionProcessReceiptResponse.java b/src/main/java/com/chargebee/v4/models/nonSubscription/responses/NonSubscriptionProcessReceiptResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/nonSubscription/NonSubscriptionProcessReceiptResponse.java
rename to src/main/java/com/chargebee/v4/models/nonSubscription/responses/NonSubscriptionProcessReceiptResponse.java
index 4c832a68..19e6b131 100644
--- a/src/main/java/com/chargebee/v4/core/responses/nonSubscription/NonSubscriptionProcessReceiptResponse.java
+++ b/src/main/java/com/chargebee/v4/models/nonSubscription/responses/NonSubscriptionProcessReceiptResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.nonSubscription;
+package com.chargebee.v4.models.nonSubscription.responses;
 
-import com.chargebee.v4.core.models.nonSubscription.NonSubscription;
+import com.chargebee.v4.models.nonSubscription.NonSubscription;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/offerEvent/params/OfferEventsParams.java b/src/main/java/com/chargebee/v4/models/offerEvent/params/OfferEventsParams.java
new file mode 100644
index 00000000..c50bfb05
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/offerEvent/params/OfferEventsParams.java
@@ -0,0 +1,108 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.offerEvent.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class OfferEventsParams {
+
+  private final String personalizedOfferId;
+
+  private final Type type;
+
+  private OfferEventsParams(OfferEventsBuilder builder) {
+
+    this.personalizedOfferId = builder.personalizedOfferId;
+
+    this.type = builder.type;
+  }
+
+  public String getPersonalizedOfferId() {
+    return personalizedOfferId;
+  }
+
+  public Type getType() {
+    return type;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.personalizedOfferId != null) {
+
+      formData.put("personalized_offer_id", this.personalizedOfferId);
+    }
+
+    if (this.type != null) {
+
+      formData.put("type", this.type);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for OfferEventsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OfferEventsBuilder builder() {
+    return new OfferEventsBuilder();
+  }
+
+  public static final class OfferEventsBuilder {
+
+    private String personalizedOfferId;
+
+    private Type type;
+
+    private OfferEventsBuilder() {}
+
+    public OfferEventsBuilder personalizedOfferId(String value) {
+      this.personalizedOfferId = value;
+      return this;
+    }
+
+    public OfferEventsBuilder type(Type value) {
+      this.type = value;
+      return this;
+    }
+
+    public OfferEventsParams build() {
+      return new OfferEventsParams(this);
+    }
+  }
+
+  public enum Type {
+    VIEWED("viewed"),
+
+    DISMISSED("dismissed"),
+
+    /** An enum member indicating that Type was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Type(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Type fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Type enumValue : Type.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/offerEvent/responses/OfferEventsResponse.java b/src/main/java/com/chargebee/v4/models/offerEvent/responses/OfferEventsResponse.java
new file mode 100644
index 00000000..d4af3944
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/offerEvent/responses/OfferEventsResponse.java
@@ -0,0 +1,51 @@
+package com.chargebee.v4.models.offerEvent.responses;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.transport.Response;
+
+/** Immutable response object for OfferEvents operation. Contains the response data from the API. */
+public final class OfferEventsResponse extends BaseResponse {
+
+  private OfferEventsResponse(Builder builder) {
+    super(builder.httpResponse);
+  }
+
+  /** Parse JSON response into OfferEventsResponse object. */
+  public static OfferEventsResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into OfferEventsResponse object with HTTP response. */
+  public static OfferEventsResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse OfferEventsResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for OfferEventsResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for OfferEventsResponse. */
+  public static class Builder {
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public OfferEventsResponse build() {
+      return new OfferEventsResponse(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/offerFulfillment/OfferFulfillment.java b/src/main/java/com/chargebee/v4/models/offerFulfillment/OfferFulfillment.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/offerFulfillment/OfferFulfillment.java
rename to src/main/java/com/chargebee/v4/models/offerFulfillment/OfferFulfillment.java
index 47e5931b..34377686 100644
--- a/src/main/java/com/chargebee/v4/core/models/offerFulfillment/OfferFulfillment.java
+++ b/src/main/java/com/chargebee/v4/models/offerFulfillment/OfferFulfillment.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.offerFulfillment;
+package com.chargebee.v4.models.offerFulfillment;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/offerFulfillment/params/OfferFulfillmentsGetParams.java b/src/main/java/com/chargebee/v4/models/offerFulfillment/params/OfferFulfillmentsGetParams.java
new file mode 100644
index 00000000..5f307842
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/offerFulfillment/params/OfferFulfillmentsGetParams.java
@@ -0,0 +1,50 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.offerFulfillment.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class OfferFulfillmentsGetParams {
+
+  private final Map<String, Object> queryParams;
+
+  private OfferFulfillmentsGetParams(OfferFulfillmentsGetBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public OfferFulfillmentsGetBuilder toBuilder() {
+    OfferFulfillmentsGetBuilder builder = new OfferFulfillmentsGetBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for OfferFulfillmentsGetParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OfferFulfillmentsGetBuilder builder() {
+    return new OfferFulfillmentsGetBuilder();
+  }
+
+  public static final class OfferFulfillmentsGetBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private OfferFulfillmentsGetBuilder() {}
+
+    public OfferFulfillmentsGetParams build() {
+      return new OfferFulfillmentsGetParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/offerFulfillment/params/OfferFulfillmentsParams.java b/src/main/java/com/chargebee/v4/models/offerFulfillment/params/OfferFulfillmentsParams.java
new file mode 100644
index 00000000..aac85227
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/offerFulfillment/params/OfferFulfillmentsParams.java
@@ -0,0 +1,80 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.offerFulfillment.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class OfferFulfillmentsParams {
+
+  private final String personalizedOfferId;
+
+  private final String optionId;
+
+  private OfferFulfillmentsParams(OfferFulfillmentsBuilder builder) {
+
+    this.personalizedOfferId = builder.personalizedOfferId;
+
+    this.optionId = builder.optionId;
+  }
+
+  public String getPersonalizedOfferId() {
+    return personalizedOfferId;
+  }
+
+  public String getOptionId() {
+    return optionId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.personalizedOfferId != null) {
+
+      formData.put("personalized_offer_id", this.personalizedOfferId);
+    }
+
+    if (this.optionId != null) {
+
+      formData.put("option_id", this.optionId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for OfferFulfillmentsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OfferFulfillmentsBuilder builder() {
+    return new OfferFulfillmentsBuilder();
+  }
+
+  public static final class OfferFulfillmentsBuilder {
+
+    private String personalizedOfferId;
+
+    private String optionId;
+
+    private OfferFulfillmentsBuilder() {}
+
+    public OfferFulfillmentsBuilder personalizedOfferId(String value) {
+      this.personalizedOfferId = value;
+      return this;
+    }
+
+    public OfferFulfillmentsBuilder optionId(String value) {
+      this.optionId = value;
+      return this;
+    }
+
+    public OfferFulfillmentsParams build() {
+      return new OfferFulfillmentsParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/offerFulfillment/params/OfferFulfillmentsUpdateParams.java b/src/main/java/com/chargebee/v4/models/offerFulfillment/params/OfferFulfillmentsUpdateParams.java
new file mode 100644
index 00000000..18ee2825
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/offerFulfillment/params/OfferFulfillmentsUpdateParams.java
@@ -0,0 +1,128 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.offerFulfillment.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class OfferFulfillmentsUpdateParams {
+
+  private final String id;
+
+  private final Status status;
+
+  private final String failureReason;
+
+  private OfferFulfillmentsUpdateParams(OfferFulfillmentsUpdateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.status = builder.status;
+
+    this.failureReason = builder.failureReason;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public String getFailureReason() {
+    return failureReason;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.failureReason != null) {
+
+      formData.put("failure_reason", this.failureReason);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for OfferFulfillmentsUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OfferFulfillmentsUpdateBuilder builder() {
+    return new OfferFulfillmentsUpdateBuilder();
+  }
+
+  public static final class OfferFulfillmentsUpdateBuilder {
+
+    private String id;
+
+    private Status status;
+
+    private String failureReason;
+
+    private OfferFulfillmentsUpdateBuilder() {}
+
+    public OfferFulfillmentsUpdateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public OfferFulfillmentsUpdateBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public OfferFulfillmentsUpdateBuilder failureReason(String value) {
+      this.failureReason = value;
+      return this;
+    }
+
+    public OfferFulfillmentsUpdateParams build() {
+      return new OfferFulfillmentsUpdateParams(this);
+    }
+  }
+
+  public enum Status {
+    COMPLETED("completed"),
+
+    FAILED("failed"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/offerFulfillment/responses/OfferFulfillmentsGetResponse.java b/src/main/java/com/chargebee/v4/models/offerFulfillment/responses/OfferFulfillmentsGetResponse.java
new file mode 100644
index 00000000..e29a71a4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/offerFulfillment/responses/OfferFulfillmentsGetResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.offerFulfillment.responses;
+
+import com.chargebee.v4.models.offerFulfillment.OfferFulfillment;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for OfferFulfillmentsGet operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class OfferFulfillmentsGetResponse extends BaseResponse {
+  private final OfferFulfillment offerFulfillment;
+
+  private OfferFulfillmentsGetResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.offerFulfillment = builder.offerFulfillment;
+  }
+
+  /** Parse JSON response into OfferFulfillmentsGetResponse object. */
+  public static OfferFulfillmentsGetResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into OfferFulfillmentsGetResponse object with HTTP response. */
+  public static OfferFulfillmentsGetResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __offerFulfillmentJson = JsonUtil.getObject(json, "offer_fulfillment");
+      if (__offerFulfillmentJson != null) {
+        builder.offerFulfillment(OfferFulfillment.fromJson(__offerFulfillmentJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse OfferFulfillmentsGetResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for OfferFulfillmentsGetResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for OfferFulfillmentsGetResponse. */
+  public static class Builder {
+
+    private OfferFulfillment offerFulfillment;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder offerFulfillment(OfferFulfillment offerFulfillment) {
+      this.offerFulfillment = offerFulfillment;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public OfferFulfillmentsGetResponse build() {
+      return new OfferFulfillmentsGetResponse(this);
+    }
+  }
+
+  /** Get the offerFulfillment from the response. */
+  public OfferFulfillment getOfferFulfillment() {
+    return offerFulfillment;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/offerFulfillment/responses/OfferFulfillmentsResponse.java b/src/main/java/com/chargebee/v4/models/offerFulfillment/responses/OfferFulfillmentsResponse.java
new file mode 100644
index 00000000..b5f7d111
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/offerFulfillment/responses/OfferFulfillmentsResponse.java
@@ -0,0 +1,100 @@
+package com.chargebee.v4.models.offerFulfillment.responses;
+
+import com.chargebee.v4.models.offerFulfillment.OfferFulfillment;
+
+import com.chargebee.v4.models.hostedPage.HostedPage;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for OfferFulfillments operation. Contains the response data from the
+ * API.
+ */
+public final class OfferFulfillmentsResponse extends BaseResponse {
+  private final OfferFulfillment offerFulfillment;
+
+  private final HostedPage hostedPage;
+
+  private OfferFulfillmentsResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.offerFulfillment = builder.offerFulfillment;
+
+    this.hostedPage = builder.hostedPage;
+  }
+
+  /** Parse JSON response into OfferFulfillmentsResponse object. */
+  public static OfferFulfillmentsResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into OfferFulfillmentsResponse object with HTTP response. */
+  public static OfferFulfillmentsResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __offerFulfillmentJson = JsonUtil.getObject(json, "offer_fulfillment");
+      if (__offerFulfillmentJson != null) {
+        builder.offerFulfillment(OfferFulfillment.fromJson(__offerFulfillmentJson));
+      }
+
+      String __hostedPageJson = JsonUtil.getObject(json, "hosted_page");
+      if (__hostedPageJson != null) {
+        builder.hostedPage(HostedPage.fromJson(__hostedPageJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse OfferFulfillmentsResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for OfferFulfillmentsResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for OfferFulfillmentsResponse. */
+  public static class Builder {
+
+    private OfferFulfillment offerFulfillment;
+
+    private HostedPage hostedPage;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder offerFulfillment(OfferFulfillment offerFulfillment) {
+      this.offerFulfillment = offerFulfillment;
+      return this;
+    }
+
+    public Builder hostedPage(HostedPage hostedPage) {
+      this.hostedPage = hostedPage;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public OfferFulfillmentsResponse build() {
+      return new OfferFulfillmentsResponse(this);
+    }
+  }
+
+  /** Get the offerFulfillment from the response. */
+  public OfferFulfillment getOfferFulfillment() {
+    return offerFulfillment;
+  }
+
+  /** Get the hostedPage from the response. */
+  public HostedPage getHostedPage() {
+    return hostedPage;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/offerFulfillment/responses/OfferFulfillmentsUpdateResponse.java b/src/main/java/com/chargebee/v4/models/offerFulfillment/responses/OfferFulfillmentsUpdateResponse.java
new file mode 100644
index 00000000..bea12526
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/offerFulfillment/responses/OfferFulfillmentsUpdateResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.offerFulfillment.responses;
+
+import com.chargebee.v4.models.offerFulfillment.OfferFulfillment;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for OfferFulfillmentsUpdate operation. Contains the response data from
+ * the API.
+ */
+public final class OfferFulfillmentsUpdateResponse extends BaseResponse {
+  private final OfferFulfillment offerFulfillment;
+
+  private OfferFulfillmentsUpdateResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.offerFulfillment = builder.offerFulfillment;
+  }
+
+  /** Parse JSON response into OfferFulfillmentsUpdateResponse object. */
+  public static OfferFulfillmentsUpdateResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into OfferFulfillmentsUpdateResponse object with HTTP response. */
+  public static OfferFulfillmentsUpdateResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __offerFulfillmentJson = JsonUtil.getObject(json, "offer_fulfillment");
+      if (__offerFulfillmentJson != null) {
+        builder.offerFulfillment(OfferFulfillment.fromJson(__offerFulfillmentJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse OfferFulfillmentsUpdateResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for OfferFulfillmentsUpdateResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for OfferFulfillmentsUpdateResponse. */
+  public static class Builder {
+
+    private OfferFulfillment offerFulfillment;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder offerFulfillment(OfferFulfillment offerFulfillment) {
+      this.offerFulfillment = offerFulfillment;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public OfferFulfillmentsUpdateResponse build() {
+      return new OfferFulfillmentsUpdateResponse(this);
+    }
+  }
+
+  /** Get the offerFulfillment from the response. */
+  public OfferFulfillment getOfferFulfillment() {
+    return offerFulfillment;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrder/OmnichannelOneTimeOrder.java b/src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/OmnichannelOneTimeOrder.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrder/OmnichannelOneTimeOrder.java
rename to src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/OmnichannelOneTimeOrder.java
index 05ea5394..b591c787 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrder/OmnichannelOneTimeOrder.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/OmnichannelOneTimeOrder.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelOneTimeOrder;
+package com.chargebee.v4.models.omnichannelOneTimeOrder;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrder/params/OmnichannelOneTimeOrderListParams.java b/src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/params/OmnichannelOneTimeOrderListParams.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrder/params/OmnichannelOneTimeOrderListParams.java
rename to src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/params/OmnichannelOneTimeOrderListParams.java
index d6a225fd..bf53f876 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrder/params/OmnichannelOneTimeOrderListParams.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/params/OmnichannelOneTimeOrderListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelOneTimeOrder.params;
+package com.chargebee.v4.models.omnichannelOneTimeOrder.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrder/params/OmnichannelOneTimeOrderRetrieveParams.java b/src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/params/OmnichannelOneTimeOrderRetrieveParams.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrder/params/OmnichannelOneTimeOrderRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/params/OmnichannelOneTimeOrderRetrieveParams.java
index 6ec9032e..fbeae142 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrder/params/OmnichannelOneTimeOrderRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/params/OmnichannelOneTimeOrderRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelOneTimeOrder.params;
+package com.chargebee.v4.models.omnichannelOneTimeOrder.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/omnichannelOneTimeOrder/OmnichannelOneTimeOrderListResponse.java b/src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/responses/OmnichannelOneTimeOrderListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/omnichannelOneTimeOrder/OmnichannelOneTimeOrderListResponse.java
rename to src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/responses/OmnichannelOneTimeOrderListResponse.java
index 140b5689..a2c065b1 100644
--- a/src/main/java/com/chargebee/v4/core/responses/omnichannelOneTimeOrder/OmnichannelOneTimeOrderListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/responses/OmnichannelOneTimeOrderListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.omnichannelOneTimeOrder;
+package com.chargebee.v4.models.omnichannelOneTimeOrder.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.omnichannelOneTimeOrder.OmnichannelOneTimeOrder;
+import com.chargebee.v4.models.omnichannelOneTimeOrder.OmnichannelOneTimeOrder;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.OmnichannelOneTimeOrderService;
-import com.chargebee.v4.core.models.omnichannelOneTimeOrder.params.OmnichannelOneTimeOrderListParams;
+import com.chargebee.v4.services.OmnichannelOneTimeOrderService;
+import com.chargebee.v4.models.omnichannelOneTimeOrder.params.OmnichannelOneTimeOrderListParams;
 
 /**
  * Immutable response object for OmnichannelOneTimeOrderList operation. Contains paginated list
@@ -104,9 +105,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public OmnichannelOneTimeOrderListResponse nextPage() throws Exception {
+  public OmnichannelOneTimeOrderListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/responses/OmnichannelOneTimeOrderRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/responses/OmnichannelOneTimeOrderRetrieveResponse.java
new file mode 100644
index 00000000..52dfb65d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/responses/OmnichannelOneTimeOrderRetrieveResponse.java
@@ -0,0 +1,80 @@
+package com.chargebee.v4.models.omnichannelOneTimeOrder.responses;
+
+import com.chargebee.v4.models.omnichannelOneTimeOrder.OmnichannelOneTimeOrder;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for OmnichannelOneTimeOrderRetrieve operation. Contains the response
+ * data from a single resource get operation.
+ */
+public final class OmnichannelOneTimeOrderRetrieveResponse extends BaseResponse {
+  private final OmnichannelOneTimeOrder omnichannelOneTimeOrder;
+
+  private OmnichannelOneTimeOrderRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.omnichannelOneTimeOrder = builder.omnichannelOneTimeOrder;
+  }
+
+  /** Parse JSON response into OmnichannelOneTimeOrderRetrieveResponse object. */
+  public static OmnichannelOneTimeOrderRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into OmnichannelOneTimeOrderRetrieveResponse object with HTTP response. */
+  public static OmnichannelOneTimeOrderRetrieveResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __omnichannelOneTimeOrderJson = JsonUtil.getObject(json, "omnichannel_one_time_order");
+      if (__omnichannelOneTimeOrderJson != null) {
+        builder.omnichannelOneTimeOrder(
+            OmnichannelOneTimeOrder.fromJson(__omnichannelOneTimeOrderJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse OmnichannelOneTimeOrderRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for OmnichannelOneTimeOrderRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for OmnichannelOneTimeOrderRetrieveResponse. */
+  public static class Builder {
+
+    private OmnichannelOneTimeOrder omnichannelOneTimeOrder;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder omnichannelOneTimeOrder(OmnichannelOneTimeOrder omnichannelOneTimeOrder) {
+      this.omnichannelOneTimeOrder = omnichannelOneTimeOrder;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public OmnichannelOneTimeOrderRetrieveResponse build() {
+      return new OmnichannelOneTimeOrderRetrieveResponse(this);
+    }
+  }
+
+  /** Get the omnichannelOneTimeOrder from the response. */
+  public OmnichannelOneTimeOrder getOmnichannelOneTimeOrder() {
+    return omnichannelOneTimeOrder;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrderItem/OmnichannelOneTimeOrderItem.java b/src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrderItem/OmnichannelOneTimeOrderItem.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrderItem/OmnichannelOneTimeOrderItem.java
rename to src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrderItem/OmnichannelOneTimeOrderItem.java
index f7b0c1f7..2b580d0e 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelOneTimeOrderItem/OmnichannelOneTimeOrderItem.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelOneTimeOrderItem/OmnichannelOneTimeOrderItem.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelOneTimeOrderItem;
+package com.chargebee.v4.models.omnichannelOneTimeOrderItem;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/OmnichannelSubscription.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/OmnichannelSubscription.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/OmnichannelSubscription.java
rename to src/main/java/com/chargebee/v4/models/omnichannelSubscription/OmnichannelSubscription.java
index 13dcd6b9..31cc72d5 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/OmnichannelSubscription.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/OmnichannelSubscription.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscription;
+package com.chargebee.v4.models.omnichannelSubscription;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/params/OmnichannelSubscriptionListParams.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/params/OmnichannelSubscriptionListParams.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/params/OmnichannelSubscriptionListParams.java
rename to src/main/java/com/chargebee/v4/models/omnichannelSubscription/params/OmnichannelSubscriptionListParams.java
index 28783063..f2f367d8 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/params/OmnichannelSubscriptionListParams.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/params/OmnichannelSubscriptionListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscription.params;
+package com.chargebee.v4.models.omnichannelSubscription.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/omnichannelSubscription/params/OmnichannelSubscriptionMoveParams.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/params/OmnichannelSubscriptionMoveParams.java
new file mode 100644
index 00000000..eaf0bdbc
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/params/OmnichannelSubscriptionMoveParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.omnichannelSubscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class OmnichannelSubscriptionMoveParams {
+
+  private final String toCustomerId;
+
+  private OmnichannelSubscriptionMoveParams(OmnichannelSubscriptionMoveBuilder builder) {
+
+    this.toCustomerId = builder.toCustomerId;
+  }
+
+  public String getToCustomerId() {
+    return toCustomerId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.toCustomerId != null) {
+
+      formData.put("to_customer_id", this.toCustomerId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for OmnichannelSubscriptionMoveParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OmnichannelSubscriptionMoveBuilder builder() {
+    return new OmnichannelSubscriptionMoveBuilder();
+  }
+
+  public static final class OmnichannelSubscriptionMoveBuilder {
+
+    private String toCustomerId;
+
+    private OmnichannelSubscriptionMoveBuilder() {}
+
+    public OmnichannelSubscriptionMoveBuilder toCustomerId(String value) {
+      this.toCustomerId = value;
+      return this;
+    }
+
+    public OmnichannelSubscriptionMoveParams build() {
+      return new OmnichannelSubscriptionMoveParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/params/OmnichannelSubscriptionRetrieveParams.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/params/OmnichannelSubscriptionRetrieveParams.java
similarity index 95%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/params/OmnichannelSubscriptionRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/omnichannelSubscription/params/OmnichannelSubscriptionRetrieveParams.java
index 8a48fc4f..51bd038c 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscription/params/OmnichannelSubscriptionRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/params/OmnichannelSubscriptionRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscription.params;
+package com.chargebee.v4.models.omnichannelSubscription.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/omnichannelSubscription/params/OmnichannelTransactionsForOmnichannelSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/params/OmnichannelTransactionsForOmnichannelSubscriptionParams.java
new file mode 100644
index 00000000..e342a33d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/params/OmnichannelTransactionsForOmnichannelSubscriptionParams.java
@@ -0,0 +1,62 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.omnichannelSubscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class OmnichannelTransactionsForOmnichannelSubscriptionParams {
+
+  private final Map<String, Object> queryParams;
+
+  private OmnichannelTransactionsForOmnichannelSubscriptionParams(
+      OmnichannelTransactionsForOmnichannelSubscriptionBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public OmnichannelTransactionsForOmnichannelSubscriptionBuilder toBuilder() {
+    OmnichannelTransactionsForOmnichannelSubscriptionBuilder builder =
+        new OmnichannelTransactionsForOmnichannelSubscriptionBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for OmnichannelTransactionsForOmnichannelSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OmnichannelTransactionsForOmnichannelSubscriptionBuilder builder() {
+    return new OmnichannelTransactionsForOmnichannelSubscriptionBuilder();
+  }
+
+  public static final class OmnichannelTransactionsForOmnichannelSubscriptionBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private OmnichannelTransactionsForOmnichannelSubscriptionBuilder() {}
+
+    public OmnichannelTransactionsForOmnichannelSubscriptionBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public OmnichannelTransactionsForOmnichannelSubscriptionBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public OmnichannelTransactionsForOmnichannelSubscriptionParams build() {
+      return new OmnichannelTransactionsForOmnichannelSubscriptionParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/omnichannelSubscription/OmnichannelSubscriptionListResponse.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelSubscriptionListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/omnichannelSubscription/OmnichannelSubscriptionListResponse.java
rename to src/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelSubscriptionListResponse.java
index 06666a86..2197a4ce 100644
--- a/src/main/java/com/chargebee/v4/core/responses/omnichannelSubscription/OmnichannelSubscriptionListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelSubscriptionListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.omnichannelSubscription;
+package com.chargebee.v4.models.omnichannelSubscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.OmnichannelSubscriptionService;
-import com.chargebee.v4.core.models.omnichannelSubscription.params.OmnichannelSubscriptionListParams;
+import com.chargebee.v4.services.OmnichannelSubscriptionService;
+import com.chargebee.v4.models.omnichannelSubscription.params.OmnichannelSubscriptionListParams;
 
 /**
  * Immutable response object for OmnichannelSubscriptionList operation. Contains paginated list
@@ -104,9 +105,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public OmnichannelSubscriptionListResponse nextPage() throws Exception {
+  public OmnichannelSubscriptionListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/omnichannelSubscription/OmnichannelSubscriptionMoveResponse.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelSubscriptionMoveResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/omnichannelSubscription/OmnichannelSubscriptionMoveResponse.java
rename to src/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelSubscriptionMoveResponse.java
index 5023a556..0a67506a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/omnichannelSubscription/OmnichannelSubscriptionMoveResponse.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelSubscriptionMoveResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.omnichannelSubscription;
+package com.chargebee.v4.models.omnichannelSubscription.responses;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.OmnichannelSubscription;
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelSubscriptionRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelSubscriptionRetrieveResponse.java
new file mode 100644
index 00000000..5981cf7c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelSubscriptionRetrieveResponse.java
@@ -0,0 +1,80 @@
+package com.chargebee.v4.models.omnichannelSubscription.responses;
+
+import com.chargebee.v4.models.omnichannelSubscription.OmnichannelSubscription;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for OmnichannelSubscriptionRetrieve operation. Contains the response
+ * data from a single resource get operation.
+ */
+public final class OmnichannelSubscriptionRetrieveResponse extends BaseResponse {
+  private final OmnichannelSubscription omnichannelSubscription;
+
+  private OmnichannelSubscriptionRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.omnichannelSubscription = builder.omnichannelSubscription;
+  }
+
+  /** Parse JSON response into OmnichannelSubscriptionRetrieveResponse object. */
+  public static OmnichannelSubscriptionRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into OmnichannelSubscriptionRetrieveResponse object with HTTP response. */
+  public static OmnichannelSubscriptionRetrieveResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __omnichannelSubscriptionJson = JsonUtil.getObject(json, "omnichannel_subscription");
+      if (__omnichannelSubscriptionJson != null) {
+        builder.omnichannelSubscription(
+            OmnichannelSubscription.fromJson(__omnichannelSubscriptionJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse OmnichannelSubscriptionRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for OmnichannelSubscriptionRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for OmnichannelSubscriptionRetrieveResponse. */
+  public static class Builder {
+
+    private OmnichannelSubscription omnichannelSubscription;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder omnichannelSubscription(OmnichannelSubscription omnichannelSubscription) {
+      this.omnichannelSubscription = omnichannelSubscription;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public OmnichannelSubscriptionRetrieveResponse build() {
+      return new OmnichannelSubscriptionRetrieveResponse(this);
+    }
+  }
+
+  /** Get the omnichannelSubscription from the response. */
+  public OmnichannelSubscription getOmnichannelSubscription() {
+    return omnichannelSubscription;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelTransactionsForOmnichannelSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelTransactionsForOmnichannelSubscriptionResponse.java
new file mode 100644
index 00000000..de5bd3bd
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelTransactionsForOmnichannelSubscriptionResponse.java
@@ -0,0 +1,190 @@
+package com.chargebee.v4.models.omnichannelSubscription.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.omnichannelTransaction.OmnichannelTransaction;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.OmnichannelSubscriptionService;
+import com.chargebee.v4.models.omnichannelSubscription.params.OmnichannelTransactionsForOmnichannelSubscriptionParams;
+
+/**
+ * Immutable response object for OmnichannelTransactionsForOmnichannelSubscription operation.
+ * Contains paginated list data.
+ */
+public final class OmnichannelTransactionsForOmnichannelSubscriptionResponse {
+
+  private final List<OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem>
+      list;
+
+  private final String nextOffset;
+
+  private final String omnichannelSubscriptionId;
+
+  private final OmnichannelSubscriptionService service;
+  private final OmnichannelTransactionsForOmnichannelSubscriptionParams originalParams;
+  private final Response httpResponse;
+
+  private OmnichannelTransactionsForOmnichannelSubscriptionResponse(
+      List<OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem> list,
+      String nextOffset,
+      String omnichannelSubscriptionId,
+      OmnichannelSubscriptionService service,
+      OmnichannelTransactionsForOmnichannelSubscriptionParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.omnichannelSubscriptionId = omnichannelSubscriptionId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into OmnichannelTransactionsForOmnichannelSubscriptionResponse object (no
+   * service context). Use this when you only need to read a single page (no nextPage()).
+   */
+  public static OmnichannelTransactionsForOmnichannelSubscriptionResponse fromJson(String json) {
+    try {
+
+      List<OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(
+                  OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem
+                      ::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new OmnichannelTransactionsForOmnichannelSubscriptionResponse(
+          list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse OmnichannelTransactionsForOmnichannelSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into OmnichannelTransactionsForOmnichannelSubscriptionResponse object with
+   * service context for pagination (enables nextPage()).
+   */
+  public static OmnichannelTransactionsForOmnichannelSubscriptionResponse fromJson(
+      String json,
+      OmnichannelSubscriptionService service,
+      OmnichannelTransactionsForOmnichannelSubscriptionParams originalParams,
+      String omnichannelSubscriptionId,
+      Response httpResponse) {
+    try {
+
+      List<OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(
+                  OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem
+                      ::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new OmnichannelTransactionsForOmnichannelSubscriptionResponse(
+          list, nextOffset, omnichannelSubscriptionId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse OmnichannelTransactionsForOmnichannelSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem>
+      getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public OmnichannelTransactionsForOmnichannelSubscriptionResponse nextPage()
+      throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    OmnichannelTransactionsForOmnichannelSubscriptionParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : OmnichannelTransactionsForOmnichannelSubscriptionParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.omnichannelTransactionsForOmnichannelSubscription(
+        omnichannelSubscriptionId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem {
+
+    private OmnichannelTransaction omnichannelTransaction;
+
+    public OmnichannelTransaction getOmnichannelTransaction() {
+      return omnichannelTransaction;
+    }
+
+    public static OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem
+        fromJson(String json) {
+      OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem item =
+          new OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionItem();
+
+      String __omnichannelTransactionJson = JsonUtil.getObject(json, "omnichannel_transaction");
+      if (__omnichannelTransactionJson != null) {
+        item.omnichannelTransaction = OmnichannelTransaction.fromJson(__omnichannelTransactionJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItem/OmnichannelSubscriptionItem.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItem/OmnichannelSubscriptionItem.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItem/OmnichannelSubscriptionItem.java
rename to src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItem/OmnichannelSubscriptionItem.java
index da7178be..63747c9c 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItem/OmnichannelSubscriptionItem.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItem/OmnichannelSubscriptionItem.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItem;
+package com.chargebee.v4.models.omnichannelSubscriptionItem;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItem/params/OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItem/params/OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams.java
new file mode 100644
index 00000000..609d1cfd
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItem/params/OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams.java
@@ -0,0 +1,69 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.omnichannelSubscriptionItem.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams {
+
+  private final Map<String, Object> queryParams;
+
+  private OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams(
+      OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesBuilder toBuilder() {
+    OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesBuilder builder =
+        new OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /**
+   * Create a new builder for
+   * OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams.
+   */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesBuilder
+      builder() {
+    return new OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesBuilder();
+  }
+
+  public static final
+  class OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesBuilder() {}
+
+    public OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesBuilder limit(
+        Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesBuilder offset(
+        String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams build() {
+      return new OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItem/responses/OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItem/responses/OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse.java
new file mode 100644
index 00000000..be0c8d21
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItem/responses/OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse.java
@@ -0,0 +1,195 @@
+package com.chargebee.v4.models.omnichannelSubscriptionItem.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.omnichannelSubscriptionItemScheduledChange.OmnichannelSubscriptionItemScheduledChange;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.OmnichannelSubscriptionItemService;
+import com.chargebee.v4.models.omnichannelSubscriptionItem.params.OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams;
+
+/**
+ * Immutable response object for OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChanges
+ * operation. Contains paginated list data.
+ */
+public final class OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse {
+
+  private final List<OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesItem> list;
+
+  private final String nextOffset;
+
+  private final String omnichannelSubscriptionItemId;
+
+  private final OmnichannelSubscriptionItemService service;
+  private final OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams
+      originalParams;
+  private final Response httpResponse;
+
+  private OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse(
+      List<OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesItem> list,
+      String nextOffset,
+      String omnichannelSubscriptionItemId,
+      OmnichannelSubscriptionItemService service,
+      OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.omnichannelSubscriptionItemId = omnichannelSubscriptionItemId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into
+   * OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse object (no service
+   * context). Use this when you only need to read a single page (no nextPage()).
+   */
+  public static OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse fromJson(
+      String json) {
+    try {
+
+      List<OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse(
+          list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse from JSON",
+          e);
+    }
+  }
+
+  /**
+   * Parse JSON response into
+   * OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse object with service
+   * context for pagination (enables nextPage()).
+   */
+  public static OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse fromJson(
+      String json,
+      OmnichannelSubscriptionItemService service,
+      OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams originalParams,
+      String omnichannelSubscriptionItemId,
+      Response httpResponse) {
+    try {
+
+      List<OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse(
+          list, nextOffset, omnichannelSubscriptionItemId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse from JSON",
+          e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse nextPage()
+      throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams
+                    .builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.listOmniSubscriptionItemScheduleChanges(
+        omnichannelSubscriptionItemId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesItem {
+
+    private OmnichannelSubscriptionItemScheduledChange omnichannelSubscriptionItemScheduledChange;
+
+    public OmnichannelSubscriptionItemScheduledChange
+        getOmnichannelSubscriptionItemScheduledChange() {
+      return omnichannelSubscriptionItemScheduledChange;
+    }
+
+    public static OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesItem fromJson(
+        String json) {
+      OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesItem item =
+          new OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesItem();
+
+      String __omnichannelSubscriptionItemScheduledChangeJson =
+          JsonUtil.getObject(json, "omnichannel_subscription_item_scheduled_change");
+      if (__omnichannelSubscriptionItemScheduledChangeJson != null) {
+        item.omnichannelSubscriptionItemScheduledChange =
+            OmnichannelSubscriptionItemScheduledChange.fromJson(
+                __omnichannelSubscriptionItemScheduledChangeJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemOffer/OmnichannelSubscriptionItemOffer.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItemOffer/OmnichannelSubscriptionItemOffer.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemOffer/OmnichannelSubscriptionItemOffer.java
rename to src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItemOffer/OmnichannelSubscriptionItemOffer.java
index e086822b..fa45f202 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemOffer/OmnichannelSubscriptionItemOffer.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItemOffer/OmnichannelSubscriptionItemOffer.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemOffer;
+package com.chargebee.v4.models.omnichannelSubscriptionItemOffer;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemScheduledChange/OmnichannelSubscriptionItemScheduledChange.java b/src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItemScheduledChange/OmnichannelSubscriptionItemScheduledChange.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemScheduledChange/OmnichannelSubscriptionItemScheduledChange.java
rename to src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItemScheduledChange/OmnichannelSubscriptionItemScheduledChange.java
index 12cfa051..77a735fd 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelSubscriptionItemScheduledChange/OmnichannelSubscriptionItemScheduledChange.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelSubscriptionItemScheduledChange/OmnichannelSubscriptionItemScheduledChange.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelSubscriptionItemScheduledChange;
+package com.chargebee.v4.models.omnichannelSubscriptionItemScheduledChange;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/omnichannelTransaction/OmnichannelTransaction.java b/src/main/java/com/chargebee/v4/models/omnichannelTransaction/OmnichannelTransaction.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/omnichannelTransaction/OmnichannelTransaction.java
rename to src/main/java/com/chargebee/v4/models/omnichannelTransaction/OmnichannelTransaction.java
index 9d2c8cee..f7eaf0a4 100644
--- a/src/main/java/com/chargebee/v4/core/models/omnichannelTransaction/OmnichannelTransaction.java
+++ b/src/main/java/com/chargebee/v4/models/omnichannelTransaction/OmnichannelTransaction.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.omnichannelTransaction;
+package com.chargebee.v4.models.omnichannelTransaction;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/order/Order.java b/src/main/java/com/chargebee/v4/models/order/Order.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/order/Order.java
rename to src/main/java/com/chargebee/v4/models/order/Order.java
index 45b6e598..a4366684 100644
--- a/src/main/java/com/chargebee/v4/core/models/order/Order.java
+++ b/src/main/java/com/chargebee/v4/models/order/Order.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.order;
+package com.chargebee.v4.models.order;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.math.BigDecimal;
diff --git a/src/main/java/com/chargebee/v4/models/order/params/AssignOrderNumberParams.java b/src/main/java/com/chargebee/v4/models/order/params/AssignOrderNumberParams.java
new file mode 100644
index 00000000..597e2f35
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/params/AssignOrderNumberParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.order.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class AssignOrderNumberParams {
+
+  private AssignOrderNumberParams(AssignOrderNumberBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for AssignOrderNumberParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static AssignOrderNumberBuilder builder() {
+    return new AssignOrderNumberBuilder();
+  }
+
+  public static final class AssignOrderNumberBuilder {
+
+    private AssignOrderNumberBuilder() {}
+
+    public AssignOrderNumberParams build() {
+      return new AssignOrderNumberParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/order/params/ImportOrderParams.java b/src/main/java/com/chargebee/v4/models/order/params/ImportOrderParams.java
new file mode 100644
index 00000000..c4264b47
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/params/ImportOrderParams.java
@@ -0,0 +1,1303 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.order.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class ImportOrderParams {
+
+  private final String id;
+
+  private final String documentNumber;
+
+  private final String invoiceId;
+
+  private final Status status;
+
+  private final String subscriptionId;
+
+  private final String customerId;
+
+  private final Timestamp createdAt;
+
+  private final Timestamp orderDate;
+
+  private final Timestamp shippingDate;
+
+  private final String referenceId;
+
+  private final String fulfillmentStatus;
+
+  private final String note;
+
+  private final String trackingId;
+
+  private final String trackingUrl;
+
+  private final String batchId;
+
+  private final String shipmentCarrier;
+
+  private final Timestamp shippingCutOffDate;
+
+  private final Timestamp deliveredAt;
+
+  private final Timestamp shippedAt;
+
+  private final Timestamp cancelledAt;
+
+  private final CancellationReason cancellationReason;
+
+  private final Long refundableCreditsIssued;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final BillingAddressParams billingAddress;
+
+  private ImportOrderParams(ImportOrderBuilder builder) {
+
+    this.id = builder.id;
+
+    this.documentNumber = builder.documentNumber;
+
+    this.invoiceId = builder.invoiceId;
+
+    this.status = builder.status;
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.customerId = builder.customerId;
+
+    this.createdAt = builder.createdAt;
+
+    this.orderDate = builder.orderDate;
+
+    this.shippingDate = builder.shippingDate;
+
+    this.referenceId = builder.referenceId;
+
+    this.fulfillmentStatus = builder.fulfillmentStatus;
+
+    this.note = builder.note;
+
+    this.trackingId = builder.trackingId;
+
+    this.trackingUrl = builder.trackingUrl;
+
+    this.batchId = builder.batchId;
+
+    this.shipmentCarrier = builder.shipmentCarrier;
+
+    this.shippingCutOffDate = builder.shippingCutOffDate;
+
+    this.deliveredAt = builder.deliveredAt;
+
+    this.shippedAt = builder.shippedAt;
+
+    this.cancelledAt = builder.cancelledAt;
+
+    this.cancellationReason = builder.cancellationReason;
+
+    this.refundableCreditsIssued = builder.refundableCreditsIssued;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.billingAddress = builder.billingAddress;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getDocumentNumber() {
+    return documentNumber;
+  }
+
+  public String getInvoiceId() {
+    return invoiceId;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public Timestamp getCreatedAt() {
+    return createdAt;
+  }
+
+  public Timestamp getOrderDate() {
+    return orderDate;
+  }
+
+  public Timestamp getShippingDate() {
+    return shippingDate;
+  }
+
+  public String getReferenceId() {
+    return referenceId;
+  }
+
+  public String getFulfillmentStatus() {
+    return fulfillmentStatus;
+  }
+
+  public String getNote() {
+    return note;
+  }
+
+  public String getTrackingId() {
+    return trackingId;
+  }
+
+  public String getTrackingUrl() {
+    return trackingUrl;
+  }
+
+  public String getBatchId() {
+    return batchId;
+  }
+
+  public String getShipmentCarrier() {
+    return shipmentCarrier;
+  }
+
+  public Timestamp getShippingCutOffDate() {
+    return shippingCutOffDate;
+  }
+
+  public Timestamp getDeliveredAt() {
+    return deliveredAt;
+  }
+
+  public Timestamp getShippedAt() {
+    return shippedAt;
+  }
+
+  public Timestamp getCancelledAt() {
+    return cancelledAt;
+  }
+
+  public CancellationReason getCancellationReason() {
+    return cancellationReason;
+  }
+
+  public Long getRefundableCreditsIssued() {
+    return refundableCreditsIssued;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.documentNumber != null) {
+
+      formData.put("document_number", this.documentNumber);
+    }
+
+    if (this.invoiceId != null) {
+
+      formData.put("invoice_id", this.invoiceId);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.createdAt != null) {
+
+      formData.put("created_at", this.createdAt);
+    }
+
+    if (this.orderDate != null) {
+
+      formData.put("order_date", this.orderDate);
+    }
+
+    if (this.shippingDate != null) {
+
+      formData.put("shipping_date", this.shippingDate);
+    }
+
+    if (this.referenceId != null) {
+
+      formData.put("reference_id", this.referenceId);
+    }
+
+    if (this.fulfillmentStatus != null) {
+
+      formData.put("fulfillment_status", this.fulfillmentStatus);
+    }
+
+    if (this.note != null) {
+
+      formData.put("note", this.note);
+    }
+
+    if (this.trackingId != null) {
+
+      formData.put("tracking_id", this.trackingId);
+    }
+
+    if (this.trackingUrl != null) {
+
+      formData.put("tracking_url", this.trackingUrl);
+    }
+
+    if (this.batchId != null) {
+
+      formData.put("batch_id", this.batchId);
+    }
+
+    if (this.shipmentCarrier != null) {
+
+      formData.put("shipment_carrier", this.shipmentCarrier);
+    }
+
+    if (this.shippingCutOffDate != null) {
+
+      formData.put("shipping_cut_off_date", this.shippingCutOffDate);
+    }
+
+    if (this.deliveredAt != null) {
+
+      formData.put("delivered_at", this.deliveredAt);
+    }
+
+    if (this.shippedAt != null) {
+
+      formData.put("shipped_at", this.shippedAt);
+    }
+
+    if (this.cancelledAt != null) {
+
+      formData.put("cancelled_at", this.cancelledAt);
+    }
+
+    if (this.cancellationReason != null) {
+
+      formData.put("cancellation_reason", this.cancellationReason);
+    }
+
+    if (this.refundableCreditsIssued != null) {
+
+      formData.put("refundable_credits_issued", this.refundableCreditsIssued);
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ImportOrderParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ImportOrderBuilder builder() {
+    return new ImportOrderBuilder();
+  }
+
+  public static final class ImportOrderBuilder {
+
+    private String id;
+
+    private String documentNumber;
+
+    private String invoiceId;
+
+    private Status status;
+
+    private String subscriptionId;
+
+    private String customerId;
+
+    private Timestamp createdAt;
+
+    private Timestamp orderDate;
+
+    private Timestamp shippingDate;
+
+    private String referenceId;
+
+    private String fulfillmentStatus;
+
+    private String note;
+
+    private String trackingId;
+
+    private String trackingUrl;
+
+    private String batchId;
+
+    private String shipmentCarrier;
+
+    private Timestamp shippingCutOffDate;
+
+    private Timestamp deliveredAt;
+
+    private Timestamp shippedAt;
+
+    private Timestamp cancelledAt;
+
+    private CancellationReason cancellationReason;
+
+    private Long refundableCreditsIssued;
+
+    private ShippingAddressParams shippingAddress;
+
+    private BillingAddressParams billingAddress;
+
+    private ImportOrderBuilder() {}
+
+    public ImportOrderBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public ImportOrderBuilder documentNumber(String value) {
+      this.documentNumber = value;
+      return this;
+    }
+
+    public ImportOrderBuilder invoiceId(String value) {
+      this.invoiceId = value;
+      return this;
+    }
+
+    public ImportOrderBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public ImportOrderBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public ImportOrderBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public ImportOrderBuilder createdAt(Timestamp value) {
+      this.createdAt = value;
+      return this;
+    }
+
+    public ImportOrderBuilder orderDate(Timestamp value) {
+      this.orderDate = value;
+      return this;
+    }
+
+    public ImportOrderBuilder shippingDate(Timestamp value) {
+      this.shippingDate = value;
+      return this;
+    }
+
+    public ImportOrderBuilder referenceId(String value) {
+      this.referenceId = value;
+      return this;
+    }
+
+    public ImportOrderBuilder fulfillmentStatus(String value) {
+      this.fulfillmentStatus = value;
+      return this;
+    }
+
+    public ImportOrderBuilder note(String value) {
+      this.note = value;
+      return this;
+    }
+
+    public ImportOrderBuilder trackingId(String value) {
+      this.trackingId = value;
+      return this;
+    }
+
+    public ImportOrderBuilder trackingUrl(String value) {
+      this.trackingUrl = value;
+      return this;
+    }
+
+    public ImportOrderBuilder batchId(String value) {
+      this.batchId = value;
+      return this;
+    }
+
+    public ImportOrderBuilder shipmentCarrier(String value) {
+      this.shipmentCarrier = value;
+      return this;
+    }
+
+    public ImportOrderBuilder shippingCutOffDate(Timestamp value) {
+      this.shippingCutOffDate = value;
+      return this;
+    }
+
+    public ImportOrderBuilder deliveredAt(Timestamp value) {
+      this.deliveredAt = value;
+      return this;
+    }
+
+    public ImportOrderBuilder shippedAt(Timestamp value) {
+      this.shippedAt = value;
+      return this;
+    }
+
+    public ImportOrderBuilder cancelledAt(Timestamp value) {
+      this.cancelledAt = value;
+      return this;
+    }
+
+    public ImportOrderBuilder cancellationReason(CancellationReason value) {
+      this.cancellationReason = value;
+      return this;
+    }
+
+    public ImportOrderBuilder refundableCreditsIssued(Long value) {
+      this.refundableCreditsIssued = value;
+      return this;
+    }
+
+    public ImportOrderBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public ImportOrderBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public ImportOrderParams build() {
+      return new ImportOrderParams(this);
+    }
+  }
+
+  public enum Status {
+    CANCELLED("cancelled"),
+
+    QUEUED("queued"),
+
+    AWAITING_SHIPMENT("awaiting_shipment"),
+
+    ON_HOLD("on_hold"),
+
+    DELIVERED("delivered"),
+
+    SHIPPED("shipped"),
+
+    PARTIALLY_DELIVERED("partially_delivered"),
+
+    RETURNED("returned"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum CancellationReason {
+    SHIPPING_CUT_OFF_PASSED("shipping_cut_off_passed"),
+
+    PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
+
+    THIRD_PARTY_CANCELLATION("third_party_cancellation"),
+
+    PRODUCT_NOT_REQUIRED("product_not_required"),
+
+    DELIVERY_DATE_MISSED("delivery_date_missed"),
+
+    ALTERNATIVE_FOUND("alternative_found"),
+
+    INVOICE_WRITTEN_OFF("invoice_written_off"),
+
+    INVOICE_VOIDED("invoice_voided"),
+
+    FRAUDULENT_TRANSACTION("fraudulent_transaction"),
+
+    PAYMENT_DECLINED("payment_declined"),
+
+    SUBSCRIPTION_CANCELLED("subscription_cancelled"),
+
+    PRODUCT_NOT_AVAILABLE("product_not_available"),
+
+    OTHERS("others"),
+
+    ORDER_RESENT("order_resent"),
+
+    /** An enum member indicating that CancellationReason was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CancellationReason(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CancellationReason fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CancellationReason enumValue : CancellationReason.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/order/params/OrderCancelParams.java b/src/main/java/com/chargebee/v4/models/order/params/OrderCancelParams.java
new file mode 100644
index 00000000..e614104e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/params/OrderCancelParams.java
@@ -0,0 +1,246 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.order.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class OrderCancelParams {
+
+  private final CancellationReason cancellationReason;
+
+  private final String customerNotes;
+
+  private final String comment;
+
+  private final Timestamp cancelledAt;
+
+  private final CreditNoteParams creditNote;
+
+  private OrderCancelParams(OrderCancelBuilder builder) {
+
+    this.cancellationReason = builder.cancellationReason;
+
+    this.customerNotes = builder.customerNotes;
+
+    this.comment = builder.comment;
+
+    this.cancelledAt = builder.cancelledAt;
+
+    this.creditNote = builder.creditNote;
+  }
+
+  public CancellationReason getCancellationReason() {
+    return cancellationReason;
+  }
+
+  public String getCustomerNotes() {
+    return customerNotes;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public Timestamp getCancelledAt() {
+    return cancelledAt;
+  }
+
+  public CreditNoteParams getCreditNote() {
+    return creditNote;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.cancellationReason != null) {
+
+      formData.put("cancellation_reason", this.cancellationReason);
+    }
+
+    if (this.customerNotes != null) {
+
+      formData.put("customer_notes", this.customerNotes);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.cancelledAt != null) {
+
+      formData.put("cancelled_at", this.cancelledAt);
+    }
+
+    if (this.creditNote != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.creditNote.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "credit_note[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for OrderCancelParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OrderCancelBuilder builder() {
+    return new OrderCancelBuilder();
+  }
+
+  public static final class OrderCancelBuilder {
+
+    private CancellationReason cancellationReason;
+
+    private String customerNotes;
+
+    private String comment;
+
+    private Timestamp cancelledAt;
+
+    private CreditNoteParams creditNote;
+
+    private OrderCancelBuilder() {}
+
+    public OrderCancelBuilder cancellationReason(CancellationReason value) {
+      this.cancellationReason = value;
+      return this;
+    }
+
+    public OrderCancelBuilder customerNotes(String value) {
+      this.customerNotes = value;
+      return this;
+    }
+
+    public OrderCancelBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public OrderCancelBuilder cancelledAt(Timestamp value) {
+      this.cancelledAt = value;
+      return this;
+    }
+
+    public OrderCancelBuilder creditNote(CreditNoteParams value) {
+      this.creditNote = value;
+      return this;
+    }
+
+    public OrderCancelParams build() {
+      return new OrderCancelParams(this);
+    }
+  }
+
+  public enum CancellationReason {
+    SHIPPING_CUT_OFF_PASSED("shipping_cut_off_passed"),
+
+    PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
+
+    THIRD_PARTY_CANCELLATION("third_party_cancellation"),
+
+    PRODUCT_NOT_REQUIRED("product_not_required"),
+
+    DELIVERY_DATE_MISSED("delivery_date_missed"),
+
+    ALTERNATIVE_FOUND("alternative_found"),
+
+    INVOICE_WRITTEN_OFF("invoice_written_off"),
+
+    INVOICE_VOIDED("invoice_voided"),
+
+    FRAUDULENT_TRANSACTION("fraudulent_transaction"),
+
+    PAYMENT_DECLINED("payment_declined"),
+
+    SUBSCRIPTION_CANCELLED("subscription_cancelled"),
+
+    PRODUCT_NOT_AVAILABLE("product_not_available"),
+
+    OTHERS("others"),
+
+    ORDER_RESENT("order_resent"),
+
+    /** An enum member indicating that CancellationReason was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CancellationReason(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CancellationReason fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CancellationReason enumValue : CancellationReason.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class CreditNoteParams {
+
+    private final Long total;
+
+    private CreditNoteParams(CreditNoteBuilder builder) {
+
+      this.total = builder.total;
+    }
+
+    public Long getTotal() {
+      return total;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.total != null) {
+
+        formData.put("total", this.total);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreditNoteParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreditNoteBuilder builder() {
+      return new CreditNoteBuilder();
+    }
+
+    public static final class CreditNoteBuilder {
+
+      private Long total;
+
+      private CreditNoteBuilder() {}
+
+      public CreditNoteBuilder total(Long value) {
+        this.total = value;
+        return this;
+      }
+
+      public CreditNoteParams build() {
+        return new CreditNoteParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/order/params/OrderCreateParams.java b/src/main/java/com/chargebee/v4/models/order/params/OrderCreateParams.java
new file mode 100644
index 00000000..fd174f63
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/params/OrderCreateParams.java
@@ -0,0 +1,254 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.order.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class OrderCreateParams {
+
+  private final String id;
+
+  private final String invoiceId;
+
+  private final Status status;
+
+  private final String referenceId;
+
+  private final String fulfillmentStatus;
+
+  private final String note;
+
+  private final String trackingId;
+
+  private final String trackingUrl;
+
+  private final String batchId;
+
+  private OrderCreateParams(OrderCreateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.invoiceId = builder.invoiceId;
+
+    this.status = builder.status;
+
+    this.referenceId = builder.referenceId;
+
+    this.fulfillmentStatus = builder.fulfillmentStatus;
+
+    this.note = builder.note;
+
+    this.trackingId = builder.trackingId;
+
+    this.trackingUrl = builder.trackingUrl;
+
+    this.batchId = builder.batchId;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getInvoiceId() {
+    return invoiceId;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public String getReferenceId() {
+    return referenceId;
+  }
+
+  public String getFulfillmentStatus() {
+    return fulfillmentStatus;
+  }
+
+  public String getNote() {
+    return note;
+  }
+
+  public String getTrackingId() {
+    return trackingId;
+  }
+
+  public String getTrackingUrl() {
+    return trackingUrl;
+  }
+
+  public String getBatchId() {
+    return batchId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.invoiceId != null) {
+
+      formData.put("invoice_id", this.invoiceId);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.referenceId != null) {
+
+      formData.put("reference_id", this.referenceId);
+    }
+
+    if (this.fulfillmentStatus != null) {
+
+      formData.put("fulfillment_status", this.fulfillmentStatus);
+    }
+
+    if (this.note != null) {
+
+      formData.put("note", this.note);
+    }
+
+    if (this.trackingId != null) {
+
+      formData.put("tracking_id", this.trackingId);
+    }
+
+    if (this.trackingUrl != null) {
+
+      formData.put("tracking_url", this.trackingUrl);
+    }
+
+    if (this.batchId != null) {
+
+      formData.put("batch_id", this.batchId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for OrderCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OrderCreateBuilder builder() {
+    return new OrderCreateBuilder();
+  }
+
+  public static final class OrderCreateBuilder {
+
+    private String id;
+
+    private String invoiceId;
+
+    private Status status;
+
+    private String referenceId;
+
+    private String fulfillmentStatus;
+
+    private String note;
+
+    private String trackingId;
+
+    private String trackingUrl;
+
+    private String batchId;
+
+    private OrderCreateBuilder() {}
+
+    public OrderCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public OrderCreateBuilder invoiceId(String value) {
+      this.invoiceId = value;
+      return this;
+    }
+
+    public OrderCreateBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public OrderCreateBuilder referenceId(String value) {
+      this.referenceId = value;
+      return this;
+    }
+
+    public OrderCreateBuilder fulfillmentStatus(String value) {
+      this.fulfillmentStatus = value;
+      return this;
+    }
+
+    public OrderCreateBuilder note(String value) {
+      this.note = value;
+      return this;
+    }
+
+    public OrderCreateBuilder trackingId(String value) {
+      this.trackingId = value;
+      return this;
+    }
+
+    public OrderCreateBuilder trackingUrl(String value) {
+      this.trackingUrl = value;
+      return this;
+    }
+
+    public OrderCreateBuilder batchId(String value) {
+      this.batchId = value;
+      return this;
+    }
+
+    public OrderCreateParams build() {
+      return new OrderCreateParams(this);
+    }
+  }
+
+  public enum Status {
+    NEW("new"),
+
+    PROCESSING("processing"),
+
+    COMPLETE("complete"),
+
+    CANCELLED("cancelled"),
+
+    VOIDED("voided"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/order/params/OrderCreateRefundableCreditNoteParams.java b/src/main/java/com/chargebee/v4/models/order/params/OrderCreateRefundableCreditNoteParams.java
new file mode 100644
index 00000000..e4f2d7a6
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/params/OrderCreateRefundableCreditNoteParams.java
@@ -0,0 +1,221 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.order.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class OrderCreateRefundableCreditNoteParams {
+
+  private final String customerNotes;
+
+  private final String comment;
+
+  private final CreditNoteParams creditNote;
+
+  private OrderCreateRefundableCreditNoteParams(OrderCreateRefundableCreditNoteBuilder builder) {
+
+    this.customerNotes = builder.customerNotes;
+
+    this.comment = builder.comment;
+
+    this.creditNote = builder.creditNote;
+  }
+
+  public String getCustomerNotes() {
+    return customerNotes;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  public CreditNoteParams getCreditNote() {
+    return creditNote;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerNotes != null) {
+
+      formData.put("customer_notes", this.customerNotes);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    if (this.creditNote != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.creditNote.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "credit_note[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for OrderCreateRefundableCreditNoteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OrderCreateRefundableCreditNoteBuilder builder() {
+    return new OrderCreateRefundableCreditNoteBuilder();
+  }
+
+  public static final class OrderCreateRefundableCreditNoteBuilder {
+
+    private String customerNotes;
+
+    private String comment;
+
+    private CreditNoteParams creditNote;
+
+    private OrderCreateRefundableCreditNoteBuilder() {}
+
+    public OrderCreateRefundableCreditNoteBuilder customerNotes(String value) {
+      this.customerNotes = value;
+      return this;
+    }
+
+    public OrderCreateRefundableCreditNoteBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public OrderCreateRefundableCreditNoteBuilder creditNote(CreditNoteParams value) {
+      this.creditNote = value;
+      return this;
+    }
+
+    public OrderCreateRefundableCreditNoteParams build() {
+      return new OrderCreateRefundableCreditNoteParams(this);
+    }
+  }
+
+  public static final class CreditNoteParams {
+
+    private final ReasonCode reasonCode;
+
+    private final Long total;
+
+    private CreditNoteParams(CreditNoteBuilder builder) {
+
+      this.reasonCode = builder.reasonCode;
+
+      this.total = builder.total;
+    }
+
+    public ReasonCode getReasonCode() {
+      return reasonCode;
+    }
+
+    public Long getTotal() {
+      return total;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.reasonCode != null) {
+
+        formData.put("reason_code", this.reasonCode);
+      }
+
+      if (this.total != null) {
+
+        formData.put("total", this.total);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CreditNoteParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CreditNoteBuilder builder() {
+      return new CreditNoteBuilder();
+    }
+
+    public static final class CreditNoteBuilder {
+
+      private ReasonCode reasonCode;
+
+      private Long total;
+
+      private CreditNoteBuilder() {}
+
+      public CreditNoteBuilder reasonCode(ReasonCode value) {
+        this.reasonCode = value;
+        return this;
+      }
+
+      public CreditNoteBuilder total(Long value) {
+        this.total = value;
+        return this;
+      }
+
+      public CreditNoteParams build() {
+        return new CreditNoteParams(this);
+      }
+    }
+
+    public enum ReasonCode {
+      WRITE_OFF("write_off"),
+
+      SUBSCRIPTION_CHANGE("subscription_change"),
+
+      SUBSCRIPTION_CANCELLATION("subscription_cancellation"),
+
+      SUBSCRIPTION_PAUSE("subscription_pause"),
+
+      CHARGEBACK("chargeback"),
+
+      PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
+
+      SERVICE_UNSATISFACTORY("service_unsatisfactory"),
+
+      ORDER_CHANGE("order_change"),
+
+      ORDER_CANCELLATION("order_cancellation"),
+
+      WAIVER("waiver"),
+
+      OTHER("other"),
+
+      FRAUDULENT("fraudulent"),
+
+      /** An enum member indicating that ReasonCode was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ReasonCode(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ReasonCode fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ReasonCode enumValue : ReasonCode.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/order/params/OrderDeleteParams.java b/src/main/java/com/chargebee/v4/models/order/params/OrderDeleteParams.java
new file mode 100644
index 00000000..62d6b39d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/params/OrderDeleteParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.order.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class OrderDeleteParams {
+
+  private OrderDeleteParams(OrderDeleteBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for OrderDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OrderDeleteBuilder builder() {
+    return new OrderDeleteBuilder();
+  }
+
+  public static final class OrderDeleteBuilder {
+
+    private OrderDeleteBuilder() {}
+
+    public OrderDeleteParams build() {
+      return new OrderDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/order/params/OrderListParams.java b/src/main/java/com/chargebee/v4/models/order/params/OrderListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/order/params/OrderListParams.java
rename to src/main/java/com/chargebee/v4/models/order/params/OrderListParams.java
index e64d72d6..62371fd0 100644
--- a/src/main/java/com/chargebee/v4/core/models/order/params/OrderListParams.java
+++ b/src/main/java/com/chargebee/v4/models/order/params/OrderListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.order.params;
+package com.chargebee.v4.models.order.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/order/params/OrderReopenParams.java b/src/main/java/com/chargebee/v4/models/order/params/OrderReopenParams.java
new file mode 100644
index 00000000..a1e67225
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/params/OrderReopenParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.order.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class OrderReopenParams {
+
+  private final Boolean voidCancellationCreditNotes;
+
+  private OrderReopenParams(OrderReopenBuilder builder) {
+
+    this.voidCancellationCreditNotes = builder.voidCancellationCreditNotes;
+  }
+
+  public Boolean getVoidCancellationCreditNotes() {
+    return voidCancellationCreditNotes;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.voidCancellationCreditNotes != null) {
+
+      formData.put("void_cancellation_credit_notes", this.voidCancellationCreditNotes);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for OrderReopenParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OrderReopenBuilder builder() {
+    return new OrderReopenBuilder();
+  }
+
+  public static final class OrderReopenBuilder {
+
+    private Boolean voidCancellationCreditNotes;
+
+    private OrderReopenBuilder() {}
+
+    public OrderReopenBuilder voidCancellationCreditNotes(Boolean value) {
+      this.voidCancellationCreditNotes = value;
+      return this;
+    }
+
+    public OrderReopenParams build() {
+      return new OrderReopenParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/order/params/OrderResendParams.java b/src/main/java/com/chargebee/v4/models/order/params/OrderResendParams.java
new file mode 100644
index 00000000..e06a9bb8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/params/OrderResendParams.java
@@ -0,0 +1,180 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.order.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class OrderResendParams {
+
+  private final Timestamp shippingDate;
+
+  private final String resendReason;
+
+  private final List<OrderLineItemsParams> orderLineItems;
+
+  private OrderResendParams(OrderResendBuilder builder) {
+
+    this.shippingDate = builder.shippingDate;
+
+    this.resendReason = builder.resendReason;
+
+    this.orderLineItems = builder.orderLineItems;
+  }
+
+  public Timestamp getShippingDate() {
+    return shippingDate;
+  }
+
+  public String getResendReason() {
+    return resendReason;
+  }
+
+  public List<OrderLineItemsParams> getOrderLineItems() {
+    return orderLineItems;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.shippingDate != null) {
+
+      formData.put("shipping_date", this.shippingDate);
+    }
+
+    if (this.resendReason != null) {
+
+      formData.put("resend_reason", this.resendReason);
+    }
+
+    if (this.orderLineItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.orderLineItems.size(); i++) {
+        OrderLineItemsParams item = this.orderLineItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "order_line_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for OrderResendParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OrderResendBuilder builder() {
+    return new OrderResendBuilder();
+  }
+
+  public static final class OrderResendBuilder {
+
+    private Timestamp shippingDate;
+
+    private String resendReason;
+
+    private List<OrderLineItemsParams> orderLineItems;
+
+    private OrderResendBuilder() {}
+
+    public OrderResendBuilder shippingDate(Timestamp value) {
+      this.shippingDate = value;
+      return this;
+    }
+
+    public OrderResendBuilder resendReason(String value) {
+      this.resendReason = value;
+      return this;
+    }
+
+    public OrderResendBuilder orderLineItems(List<OrderLineItemsParams> value) {
+      this.orderLineItems = value;
+      return this;
+    }
+
+    public OrderResendParams build() {
+      return new OrderResendParams(this);
+    }
+  }
+
+  public static final class OrderLineItemsParams {
+
+    private final String id;
+
+    private final Integer fulfillmentQuantity;
+
+    private OrderLineItemsParams(OrderLineItemsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.fulfillmentQuantity = builder.fulfillmentQuantity;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getFulfillmentQuantity() {
+      return fulfillmentQuantity;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.fulfillmentQuantity != null) {
+
+        formData.put("fulfillment_quantity", this.fulfillmentQuantity);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for OrderLineItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static OrderLineItemsBuilder builder() {
+      return new OrderLineItemsBuilder();
+    }
+
+    public static final class OrderLineItemsBuilder {
+
+      private String id;
+
+      private Integer fulfillmentQuantity;
+
+      private OrderLineItemsBuilder() {}
+
+      public OrderLineItemsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public OrderLineItemsBuilder fulfillmentQuantity(Integer value) {
+        this.fulfillmentQuantity = value;
+        return this;
+      }
+
+      public OrderLineItemsParams build() {
+        return new OrderLineItemsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/order/params/OrderRetrieveParams.java b/src/main/java/com/chargebee/v4/models/order/params/OrderRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/order/params/OrderRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/order/params/OrderRetrieveParams.java
index 81b8603d..560187d0 100644
--- a/src/main/java/com/chargebee/v4/core/models/order/params/OrderRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/order/params/OrderRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.order.params;
+package com.chargebee.v4.models.order.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/order/params/OrderUpdateParams.java b/src/main/java/com/chargebee/v4/models/order/params/OrderUpdateParams.java
new file mode 100644
index 00000000..37693467
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/params/OrderUpdateParams.java
@@ -0,0 +1,945 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.order.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class OrderUpdateParams {
+
+  private final String referenceId;
+
+  private final String batchId;
+
+  private final String note;
+
+  private final Timestamp shippingDate;
+
+  private final Timestamp orderDate;
+
+  private final Timestamp cancelledAt;
+
+  private final CancellationReason cancellationReason;
+
+  private final Timestamp shippedAt;
+
+  private final Timestamp deliveredAt;
+
+  private final String trackingUrl;
+
+  private final String trackingId;
+
+  private final String shipmentCarrier;
+
+  private final String fulfillmentStatus;
+
+  private final Status status;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<OrderLineItemsParams> orderLineItems;
+
+  private OrderUpdateParams(OrderUpdateBuilder builder) {
+
+    this.referenceId = builder.referenceId;
+
+    this.batchId = builder.batchId;
+
+    this.note = builder.note;
+
+    this.shippingDate = builder.shippingDate;
+
+    this.orderDate = builder.orderDate;
+
+    this.cancelledAt = builder.cancelledAt;
+
+    this.cancellationReason = builder.cancellationReason;
+
+    this.shippedAt = builder.shippedAt;
+
+    this.deliveredAt = builder.deliveredAt;
+
+    this.trackingUrl = builder.trackingUrl;
+
+    this.trackingId = builder.trackingId;
+
+    this.shipmentCarrier = builder.shipmentCarrier;
+
+    this.fulfillmentStatus = builder.fulfillmentStatus;
+
+    this.status = builder.status;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.orderLineItems = builder.orderLineItems;
+  }
+
+  public String getReferenceId() {
+    return referenceId;
+  }
+
+  public String getBatchId() {
+    return batchId;
+  }
+
+  public String getNote() {
+    return note;
+  }
+
+  public Timestamp getShippingDate() {
+    return shippingDate;
+  }
+
+  public Timestamp getOrderDate() {
+    return orderDate;
+  }
+
+  public Timestamp getCancelledAt() {
+    return cancelledAt;
+  }
+
+  public CancellationReason getCancellationReason() {
+    return cancellationReason;
+  }
+
+  public Timestamp getShippedAt() {
+    return shippedAt;
+  }
+
+  public Timestamp getDeliveredAt() {
+    return deliveredAt;
+  }
+
+  public String getTrackingUrl() {
+    return trackingUrl;
+  }
+
+  public String getTrackingId() {
+    return trackingId;
+  }
+
+  public String getShipmentCarrier() {
+    return shipmentCarrier;
+  }
+
+  public String getFulfillmentStatus() {
+    return fulfillmentStatus;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<OrderLineItemsParams> getOrderLineItems() {
+    return orderLineItems;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.referenceId != null) {
+
+      formData.put("reference_id", this.referenceId);
+    }
+
+    if (this.batchId != null) {
+
+      formData.put("batch_id", this.batchId);
+    }
+
+    if (this.note != null) {
+
+      formData.put("note", this.note);
+    }
+
+    if (this.shippingDate != null) {
+
+      formData.put("shipping_date", this.shippingDate);
+    }
+
+    if (this.orderDate != null) {
+
+      formData.put("order_date", this.orderDate);
+    }
+
+    if (this.cancelledAt != null) {
+
+      formData.put("cancelled_at", this.cancelledAt);
+    }
+
+    if (this.cancellationReason != null) {
+
+      formData.put("cancellation_reason", this.cancellationReason);
+    }
+
+    if (this.shippedAt != null) {
+
+      formData.put("shipped_at", this.shippedAt);
+    }
+
+    if (this.deliveredAt != null) {
+
+      formData.put("delivered_at", this.deliveredAt);
+    }
+
+    if (this.trackingUrl != null) {
+
+      formData.put("tracking_url", this.trackingUrl);
+    }
+
+    if (this.trackingId != null) {
+
+      formData.put("tracking_id", this.trackingId);
+    }
+
+    if (this.shipmentCarrier != null) {
+
+      formData.put("shipment_carrier", this.shipmentCarrier);
+    }
+
+    if (this.fulfillmentStatus != null) {
+
+      formData.put("fulfillment_status", this.fulfillmentStatus);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.orderLineItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.orderLineItems.size(); i++) {
+        OrderLineItemsParams item = this.orderLineItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "order_line_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for OrderUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OrderUpdateBuilder builder() {
+    return new OrderUpdateBuilder();
+  }
+
+  public static final class OrderUpdateBuilder {
+
+    private String referenceId;
+
+    private String batchId;
+
+    private String note;
+
+    private Timestamp shippingDate;
+
+    private Timestamp orderDate;
+
+    private Timestamp cancelledAt;
+
+    private CancellationReason cancellationReason;
+
+    private Timestamp shippedAt;
+
+    private Timestamp deliveredAt;
+
+    private String trackingUrl;
+
+    private String trackingId;
+
+    private String shipmentCarrier;
+
+    private String fulfillmentStatus;
+
+    private Status status;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<OrderLineItemsParams> orderLineItems;
+
+    private OrderUpdateBuilder() {}
+
+    public OrderUpdateBuilder referenceId(String value) {
+      this.referenceId = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder batchId(String value) {
+      this.batchId = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder note(String value) {
+      this.note = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder shippingDate(Timestamp value) {
+      this.shippingDate = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder orderDate(Timestamp value) {
+      this.orderDate = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder cancelledAt(Timestamp value) {
+      this.cancelledAt = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder cancellationReason(CancellationReason value) {
+      this.cancellationReason = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder shippedAt(Timestamp value) {
+      this.shippedAt = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder deliveredAt(Timestamp value) {
+      this.deliveredAt = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder trackingUrl(String value) {
+      this.trackingUrl = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder trackingId(String value) {
+      this.trackingId = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder shipmentCarrier(String value) {
+      this.shipmentCarrier = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder fulfillmentStatus(String value) {
+      this.fulfillmentStatus = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public OrderUpdateBuilder orderLineItems(List<OrderLineItemsParams> value) {
+      this.orderLineItems = value;
+      return this;
+    }
+
+    public OrderUpdateParams build() {
+      return new OrderUpdateParams(this);
+    }
+  }
+
+  public enum CancellationReason {
+    SHIPPING_CUT_OFF_PASSED("shipping_cut_off_passed"),
+
+    PRODUCT_UNSATISFACTORY("product_unsatisfactory"),
+
+    THIRD_PARTY_CANCELLATION("third_party_cancellation"),
+
+    PRODUCT_NOT_REQUIRED("product_not_required"),
+
+    DELIVERY_DATE_MISSED("delivery_date_missed"),
+
+    ALTERNATIVE_FOUND("alternative_found"),
+
+    INVOICE_WRITTEN_OFF("invoice_written_off"),
+
+    INVOICE_VOIDED("invoice_voided"),
+
+    FRAUDULENT_TRANSACTION("fraudulent_transaction"),
+
+    PAYMENT_DECLINED("payment_declined"),
+
+    SUBSCRIPTION_CANCELLED("subscription_cancelled"),
+
+    PRODUCT_NOT_AVAILABLE("product_not_available"),
+
+    OTHERS("others"),
+
+    ORDER_RESENT("order_resent"),
+
+    /** An enum member indicating that CancellationReason was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CancellationReason(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CancellationReason fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CancellationReason enumValue : CancellationReason.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Status {
+    NEW("new"),
+
+    PROCESSING("processing"),
+
+    COMPLETE("complete"),
+
+    CANCELLED("cancelled"),
+
+    VOIDED("voided"),
+
+    QUEUED("queued"),
+
+    AWAITING_SHIPMENT("awaiting_shipment"),
+
+    ON_HOLD("on_hold"),
+
+    DELIVERED("delivered"),
+
+    SHIPPED("shipped"),
+
+    PARTIALLY_DELIVERED("partially_delivered"),
+
+    RETURNED("returned"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class OrderLineItemsParams {
+
+    private final String id;
+
+    private final Status status;
+
+    private final String sku;
+
+    private OrderLineItemsParams(OrderLineItemsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.status = builder.status;
+
+      this.sku = builder.sku;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Status getStatus() {
+      return status;
+    }
+
+    public String getSku() {
+      return sku;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.status != null) {
+
+        formData.put("status", this.status);
+      }
+
+      if (this.sku != null) {
+
+        formData.put("sku", this.sku);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for OrderLineItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static OrderLineItemsBuilder builder() {
+      return new OrderLineItemsBuilder();
+    }
+
+    public static final class OrderLineItemsBuilder {
+
+      private String id;
+
+      private Status status;
+
+      private String sku;
+
+      private OrderLineItemsBuilder() {}
+
+      public OrderLineItemsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public OrderLineItemsBuilder status(Status value) {
+        this.status = value;
+        return this;
+      }
+
+      public OrderLineItemsBuilder sku(String value) {
+        this.sku = value;
+        return this;
+      }
+
+      public OrderLineItemsParams build() {
+        return new OrderLineItemsParams(this);
+      }
+    }
+
+    public enum Status {
+      QUEUED("queued"),
+
+      AWAITING_SHIPMENT("awaiting_shipment"),
+
+      ON_HOLD("on_hold"),
+
+      DELIVERED("delivered"),
+
+      SHIPPED("shipped"),
+
+      PARTIALLY_DELIVERED("partially_delivered"),
+
+      RETURNED("returned"),
+
+      CANCELLED("cancelled"),
+
+      /** An enum member indicating that Status was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Status(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Status fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Status enumValue : Status.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/order/params/OrdersForInvoiceParams.java b/src/main/java/com/chargebee/v4/models/order/params/OrdersForInvoiceParams.java
new file mode 100644
index 00000000..26a48072
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/params/OrdersForInvoiceParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.order.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class OrdersForInvoiceParams {
+
+  private final Map<String, Object> queryParams;
+
+  private OrdersForInvoiceParams(OrdersForInvoiceBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public OrdersForInvoiceBuilder toBuilder() {
+    OrdersForInvoiceBuilder builder = new OrdersForInvoiceBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for OrdersForInvoiceParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static OrdersForInvoiceBuilder builder() {
+    return new OrdersForInvoiceBuilder();
+  }
+
+  public static final class OrdersForInvoiceBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private OrdersForInvoiceBuilder() {}
+
+    public OrdersForInvoiceBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public OrdersForInvoiceBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public OrdersForInvoiceParams build() {
+      return new OrdersForInvoiceParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/order/responses/AssignOrderNumberResponse.java b/src/main/java/com/chargebee/v4/models/order/responses/AssignOrderNumberResponse.java
new file mode 100644
index 00000000..40036fcf
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/responses/AssignOrderNumberResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.order.responses;
+
+import com.chargebee.v4.models.order.Order;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for AssignOrderNumber operation. Contains the response data from the
+ * API.
+ */
+public final class AssignOrderNumberResponse extends BaseResponse {
+  private final Order order;
+
+  private AssignOrderNumberResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.order = builder.order;
+  }
+
+  /** Parse JSON response into AssignOrderNumberResponse object. */
+  public static AssignOrderNumberResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into AssignOrderNumberResponse object with HTTP response. */
+  public static AssignOrderNumberResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __orderJson = JsonUtil.getObject(json, "order");
+      if (__orderJson != null) {
+        builder.order(Order.fromJson(__orderJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse AssignOrderNumberResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for AssignOrderNumberResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for AssignOrderNumberResponse. */
+  public static class Builder {
+
+    private Order order;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder order(Order order) {
+      this.order = order;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public AssignOrderNumberResponse build() {
+      return new AssignOrderNumberResponse(this);
+    }
+  }
+
+  /** Get the order from the response. */
+  public Order getOrder() {
+    return order;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/order/responses/ImportOrderResponse.java b/src/main/java/com/chargebee/v4/models/order/responses/ImportOrderResponse.java
new file mode 100644
index 00000000..89baf553
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/responses/ImportOrderResponse.java
@@ -0,0 +1,74 @@
+package com.chargebee.v4.models.order.responses;
+
+import com.chargebee.v4.models.order.Order;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/** Immutable response object for ImportOrder operation. Contains the response data from the API. */
+public final class ImportOrderResponse extends BaseResponse {
+  private final Order order;
+
+  private ImportOrderResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.order = builder.order;
+  }
+
+  /** Parse JSON response into ImportOrderResponse object. */
+  public static ImportOrderResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ImportOrderResponse object with HTTP response. */
+  public static ImportOrderResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __orderJson = JsonUtil.getObject(json, "order");
+      if (__orderJson != null) {
+        builder.order(Order.fromJson(__orderJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ImportOrderResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ImportOrderResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ImportOrderResponse. */
+  public static class Builder {
+
+    private Order order;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder order(Order order) {
+      this.order = order;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ImportOrderResponse build() {
+      return new ImportOrderResponse(this);
+    }
+  }
+
+  /** Get the order from the response. */
+  public Order getOrder() {
+    return order;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/order/OrderCancelResponse.java b/src/main/java/com/chargebee/v4/models/order/responses/OrderCancelResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/order/OrderCancelResponse.java
rename to src/main/java/com/chargebee/v4/models/order/responses/OrderCancelResponse.java
index f37c41c5..62c63865 100644
--- a/src/main/java/com/chargebee/v4/core/responses/order/OrderCancelResponse.java
+++ b/src/main/java/com/chargebee/v4/models/order/responses/OrderCancelResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.order;
+package com.chargebee.v4.models.order.responses;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/order/OrderCreateRefundableCreditNoteResponse.java b/src/main/java/com/chargebee/v4/models/order/responses/OrderCreateRefundableCreditNoteResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/order/OrderCreateRefundableCreditNoteResponse.java
rename to src/main/java/com/chargebee/v4/models/order/responses/OrderCreateRefundableCreditNoteResponse.java
index 5250d7b7..56989cbe 100644
--- a/src/main/java/com/chargebee/v4/core/responses/order/OrderCreateRefundableCreditNoteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/order/responses/OrderCreateRefundableCreditNoteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.order;
+package com.chargebee.v4.models.order.responses;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/order/OrderCreateResponse.java b/src/main/java/com/chargebee/v4/models/order/responses/OrderCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/order/OrderCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/order/responses/OrderCreateResponse.java
index fcb7ead0..85ef3747 100644
--- a/src/main/java/com/chargebee/v4/core/responses/order/OrderCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/order/responses/OrderCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.order;
+package com.chargebee.v4.models.order.responses;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/order/OrderDeleteResponse.java b/src/main/java/com/chargebee/v4/models/order/responses/OrderDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/order/OrderDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/order/responses/OrderDeleteResponse.java
index 08686916..5c5c6a64 100644
--- a/src/main/java/com/chargebee/v4/core/responses/order/OrderDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/order/responses/OrderDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.order;
+package com.chargebee.v4.models.order.responses;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/order/OrderListResponse.java b/src/main/java/com/chargebee/v4/models/order/responses/OrderListResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/order/OrderListResponse.java
rename to src/main/java/com/chargebee/v4/models/order/responses/OrderListResponse.java
index 7127d902..54b8e805 100644
--- a/src/main/java/com/chargebee/v4/core/responses/order/OrderListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/order/responses/OrderListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.order;
+package com.chargebee.v4.models.order.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.OrderService;
-import com.chargebee.v4.core.models.order.params.OrderListParams;
+import com.chargebee.v4.services.OrderService;
+import com.chargebee.v4.models.order.params.OrderListParams;
 
 /** Immutable response object for OrderList operation. Contains paginated list data. */
 public final class OrderListResponse {
@@ -95,9 +96,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public OrderListResponse nextPage() throws Exception {
+  public OrderListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/order/OrderReopenResponse.java b/src/main/java/com/chargebee/v4/models/order/responses/OrderReopenResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/order/OrderReopenResponse.java
rename to src/main/java/com/chargebee/v4/models/order/responses/OrderReopenResponse.java
index 10c2a68e..f341863f 100644
--- a/src/main/java/com/chargebee/v4/core/responses/order/OrderReopenResponse.java
+++ b/src/main/java/com/chargebee/v4/models/order/responses/OrderReopenResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.order;
+package com.chargebee.v4.models.order.responses;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/order/OrderResendResponse.java b/src/main/java/com/chargebee/v4/models/order/responses/OrderResendResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/order/OrderResendResponse.java
rename to src/main/java/com/chargebee/v4/models/order/responses/OrderResendResponse.java
index e1f0a91c..95e2afe4 100644
--- a/src/main/java/com/chargebee/v4/core/responses/order/OrderResendResponse.java
+++ b/src/main/java/com/chargebee/v4/models/order/responses/OrderResendResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.order;
+package com.chargebee.v4.models.order.responses;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/order/responses/OrderRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/order/responses/OrderRetrieveResponse.java
new file mode 100644
index 00000000..d1cb449b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/responses/OrderRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.order.responses;
+
+import com.chargebee.v4.models.order.Order;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for OrderRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class OrderRetrieveResponse extends BaseResponse {
+  private final Order order;
+
+  private OrderRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.order = builder.order;
+  }
+
+  /** Parse JSON response into OrderRetrieveResponse object. */
+  public static OrderRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into OrderRetrieveResponse object with HTTP response. */
+  public static OrderRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __orderJson = JsonUtil.getObject(json, "order");
+      if (__orderJson != null) {
+        builder.order(Order.fromJson(__orderJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse OrderRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for OrderRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for OrderRetrieveResponse. */
+  public static class Builder {
+
+    private Order order;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder order(Order order) {
+      this.order = order;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public OrderRetrieveResponse build() {
+      return new OrderRetrieveResponse(this);
+    }
+  }
+
+  /** Get the order from the response. */
+  public Order getOrder() {
+    return order;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/order/OrderUpdateResponse.java b/src/main/java/com/chargebee/v4/models/order/responses/OrderUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/order/OrderUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/order/responses/OrderUpdateResponse.java
index a2265789..29cc841e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/order/OrderUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/order/responses/OrderUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.order;
+package com.chargebee.v4.models.order.responses;
 
-import com.chargebee.v4.core.models.order.Order;
+import com.chargebee.v4.models.order.Order;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/order/responses/OrdersForInvoiceResponse.java b/src/main/java/com/chargebee/v4/models/order/responses/OrdersForInvoiceResponse.java
new file mode 100644
index 00000000..389bea5b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/order/responses/OrdersForInvoiceResponse.java
@@ -0,0 +1,172 @@
+package com.chargebee.v4.models.order.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.order.Order;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.OrderService;
+import com.chargebee.v4.models.order.params.OrdersForInvoiceParams;
+
+/** Immutable response object for OrdersForInvoice operation. Contains paginated list data. */
+public final class OrdersForInvoiceResponse {
+
+  private final List<OrderOrdersForInvoiceItem> list;
+
+  private final String nextOffset;
+
+  private final String invoiceId;
+
+  private final OrderService service;
+  private final OrdersForInvoiceParams originalParams;
+  private final Response httpResponse;
+
+  private OrdersForInvoiceResponse(
+      List<OrderOrdersForInvoiceItem> list,
+      String nextOffset,
+      String invoiceId,
+      OrderService service,
+      OrdersForInvoiceParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.invoiceId = invoiceId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into OrdersForInvoiceResponse object (no service context). Use this when
+   * you only need to read a single page (no nextPage()).
+   */
+  public static OrdersForInvoiceResponse fromJson(String json) {
+    try {
+
+      List<OrderOrdersForInvoiceItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(OrderOrdersForInvoiceItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new OrdersForInvoiceResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse OrdersForInvoiceResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into OrdersForInvoiceResponse object with service context for pagination
+   * (enables nextPage()).
+   */
+  public static OrdersForInvoiceResponse fromJson(
+      String json,
+      OrderService service,
+      OrdersForInvoiceParams originalParams,
+      String invoiceId,
+      Response httpResponse) {
+    try {
+
+      List<OrderOrdersForInvoiceItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(OrderOrdersForInvoiceItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new OrdersForInvoiceResponse(
+          list, nextOffset, invoiceId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse OrdersForInvoiceResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<OrderOrdersForInvoiceItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public OrdersForInvoiceResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    OrdersForInvoiceParams nextParams =
+        (originalParams != null ? originalParams.toBuilder() : OrdersForInvoiceParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.ordersForInvoice(invoiceId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class OrderOrdersForInvoiceItem {
+
+    private Order order;
+
+    public Order getOrder() {
+      return order;
+    }
+
+    public static OrderOrdersForInvoiceItem fromJson(String json) {
+      OrderOrdersForInvoiceItem item = new OrderOrdersForInvoiceItem();
+
+      String __orderJson = JsonUtil.getObject(json, "order");
+      if (__orderJson != null) {
+        item.order = Order.fromJson(__orderJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentIntent/PaymentIntent.java b/src/main/java/com/chargebee/v4/models/paymentIntent/PaymentIntent.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/paymentIntent/PaymentIntent.java
rename to src/main/java/com/chargebee/v4/models/paymentIntent/PaymentIntent.java
index 2d53fdd0..8f44a891 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentIntent/PaymentIntent.java
+++ b/src/main/java/com/chargebee/v4/models/paymentIntent/PaymentIntent.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentIntent;
+package com.chargebee.v4.models.paymentIntent;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -186,6 +186,16 @@ public enum PaymentMethodType {
 
     PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
 
+    ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+    KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+    PAY_BY_BANK("pay_by_bank"),
+
+    TRUSTLY("trustly"),
+
+    STABLECOIN("stablecoin"),
+
     /** An enum member indicating that PaymentMethodType was instantiated with an unknown value. */
     _UNKNOWN(null);
     private final String value;
@@ -394,6 +404,16 @@ public enum PaymentMethodType {
 
       PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
 
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
       /**
        * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
        */
@@ -699,6 +719,16 @@ public enum PaymentMethodType {
 
       PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
 
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
       /**
        * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
        */
diff --git a/src/main/java/com/chargebee/v4/models/paymentIntent/params/PaymentIntentCreateParams.java b/src/main/java/com/chargebee/v4/models/paymentIntent/params/PaymentIntentCreateParams.java
new file mode 100644
index 00000000..342b435f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentIntent/params/PaymentIntentCreateParams.java
@@ -0,0 +1,296 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentIntent.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentIntentCreateParams {
+
+  private final String businessEntityId;
+
+  private final String customerId;
+
+  private final Long amount;
+
+  private final String currencyCode;
+
+  private final String gatewayAccountId;
+
+  private final String referenceId;
+
+  private final PaymentMethodType paymentMethodType;
+
+  private final String successUrl;
+
+  private final String failureUrl;
+
+  private PaymentIntentCreateParams(PaymentIntentCreateBuilder builder) {
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.customerId = builder.customerId;
+
+    this.amount = builder.amount;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.gatewayAccountId = builder.gatewayAccountId;
+
+    this.referenceId = builder.referenceId;
+
+    this.paymentMethodType = builder.paymentMethodType;
+
+    this.successUrl = builder.successUrl;
+
+    this.failureUrl = builder.failureUrl;
+  }
+
+  public String getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getGatewayAccountId() {
+    return gatewayAccountId;
+  }
+
+  public String getReferenceId() {
+    return referenceId;
+  }
+
+  public PaymentMethodType getPaymentMethodType() {
+    return paymentMethodType;
+  }
+
+  public String getSuccessUrl() {
+    return successUrl;
+  }
+
+  public String getFailureUrl() {
+    return failureUrl;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.businessEntityId != null) {
+
+      formData.put("business_entity_id", this.businessEntityId);
+    }
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.gatewayAccountId != null) {
+
+      formData.put("gateway_account_id", this.gatewayAccountId);
+    }
+
+    if (this.referenceId != null) {
+
+      formData.put("reference_id", this.referenceId);
+    }
+
+    if (this.paymentMethodType != null) {
+
+      formData.put("payment_method_type", this.paymentMethodType);
+    }
+
+    if (this.successUrl != null) {
+
+      formData.put("success_url", this.successUrl);
+    }
+
+    if (this.failureUrl != null) {
+
+      formData.put("failure_url", this.failureUrl);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentIntentCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentIntentCreateBuilder builder() {
+    return new PaymentIntentCreateBuilder();
+  }
+
+  public static final class PaymentIntentCreateBuilder {
+
+    private String businessEntityId;
+
+    private String customerId;
+
+    private Long amount;
+
+    private String currencyCode;
+
+    private String gatewayAccountId;
+
+    private String referenceId;
+
+    private PaymentMethodType paymentMethodType;
+
+    private String successUrl;
+
+    private String failureUrl;
+
+    private PaymentIntentCreateBuilder() {}
+
+    public PaymentIntentCreateBuilder businessEntityId(String value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public PaymentIntentCreateBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PaymentIntentCreateBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public PaymentIntentCreateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public PaymentIntentCreateBuilder gatewayAccountId(String value) {
+      this.gatewayAccountId = value;
+      return this;
+    }
+
+    public PaymentIntentCreateBuilder referenceId(String value) {
+      this.referenceId = value;
+      return this;
+    }
+
+    public PaymentIntentCreateBuilder paymentMethodType(PaymentMethodType value) {
+      this.paymentMethodType = value;
+      return this;
+    }
+
+    public PaymentIntentCreateBuilder successUrl(String value) {
+      this.successUrl = value;
+      return this;
+    }
+
+    public PaymentIntentCreateBuilder failureUrl(String value) {
+      this.failureUrl = value;
+      return this;
+    }
+
+    public PaymentIntentCreateParams build() {
+      return new PaymentIntentCreateParams(this);
+    }
+  }
+
+  public enum PaymentMethodType {
+    CARD("card"),
+
+    IDEAL("ideal"),
+
+    SOFORT("sofort"),
+
+    BANCONTACT("bancontact"),
+
+    GOOGLE_PAY("google_pay"),
+
+    DOTPAY("dotpay"),
+
+    GIROPAY("giropay"),
+
+    APPLE_PAY("apple_pay"),
+
+    UPI("upi"),
+
+    NETBANKING_EMANDATES("netbanking_emandates"),
+
+    PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+    DIRECT_DEBIT("direct_debit"),
+
+    BOLETO("boleto"),
+
+    VENMO("venmo"),
+
+    AMAZON_PAYMENTS("amazon_payments"),
+
+    PAY_TO("pay_to"),
+
+    FASTER_PAYMENTS("faster_payments"),
+
+    SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+    KLARNA_PAY_NOW("klarna_pay_now"),
+
+    ONLINE_BANKING_POLAND("online_banking_poland"),
+
+    PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+    ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+    KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+    PAY_BY_BANK("pay_by_bank"),
+
+    TRUSTLY("trustly"),
+
+    STABLECOIN("stablecoin"),
+
+    /** An enum member indicating that PaymentMethodType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentMethodType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentMethodType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentIntent/params/PaymentIntentRetrieveParams.java b/src/main/java/com/chargebee/v4/models/paymentIntent/params/PaymentIntentRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/paymentIntent/params/PaymentIntentRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/paymentIntent/params/PaymentIntentRetrieveParams.java
index 76225e72..354ebe7b 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentIntent/params/PaymentIntentRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/paymentIntent/params/PaymentIntentRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentIntent.params;
+package com.chargebee.v4.models.paymentIntent.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/paymentIntent/params/PaymentIntentUpdateParams.java b/src/main/java/com/chargebee/v4/models/paymentIntent/params/PaymentIntentUpdateParams.java
new file mode 100644
index 00000000..5a985841
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentIntent/params/PaymentIntentUpdateParams.java
@@ -0,0 +1,236 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentIntent.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentIntentUpdateParams {
+
+  private final Long amount;
+
+  private final String currencyCode;
+
+  private final String gatewayAccountId;
+
+  private final PaymentMethodType paymentMethodType;
+
+  private final String successUrl;
+
+  private final String failureUrl;
+
+  private PaymentIntentUpdateParams(PaymentIntentUpdateBuilder builder) {
+
+    this.amount = builder.amount;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.gatewayAccountId = builder.gatewayAccountId;
+
+    this.paymentMethodType = builder.paymentMethodType;
+
+    this.successUrl = builder.successUrl;
+
+    this.failureUrl = builder.failureUrl;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getGatewayAccountId() {
+    return gatewayAccountId;
+  }
+
+  public PaymentMethodType getPaymentMethodType() {
+    return paymentMethodType;
+  }
+
+  public String getSuccessUrl() {
+    return successUrl;
+  }
+
+  public String getFailureUrl() {
+    return failureUrl;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.gatewayAccountId != null) {
+
+      formData.put("gateway_account_id", this.gatewayAccountId);
+    }
+
+    if (this.paymentMethodType != null) {
+
+      formData.put("payment_method_type", this.paymentMethodType);
+    }
+
+    if (this.successUrl != null) {
+
+      formData.put("success_url", this.successUrl);
+    }
+
+    if (this.failureUrl != null) {
+
+      formData.put("failure_url", this.failureUrl);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentIntentUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentIntentUpdateBuilder builder() {
+    return new PaymentIntentUpdateBuilder();
+  }
+
+  public static final class PaymentIntentUpdateBuilder {
+
+    private Long amount;
+
+    private String currencyCode;
+
+    private String gatewayAccountId;
+
+    private PaymentMethodType paymentMethodType;
+
+    private String successUrl;
+
+    private String failureUrl;
+
+    private PaymentIntentUpdateBuilder() {}
+
+    public PaymentIntentUpdateBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public PaymentIntentUpdateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public PaymentIntentUpdateBuilder gatewayAccountId(String value) {
+      this.gatewayAccountId = value;
+      return this;
+    }
+
+    public PaymentIntentUpdateBuilder paymentMethodType(PaymentMethodType value) {
+      this.paymentMethodType = value;
+      return this;
+    }
+
+    public PaymentIntentUpdateBuilder successUrl(String value) {
+      this.successUrl = value;
+      return this;
+    }
+
+    public PaymentIntentUpdateBuilder failureUrl(String value) {
+      this.failureUrl = value;
+      return this;
+    }
+
+    public PaymentIntentUpdateParams build() {
+      return new PaymentIntentUpdateParams(this);
+    }
+  }
+
+  public enum PaymentMethodType {
+    CARD("card"),
+
+    IDEAL("ideal"),
+
+    SOFORT("sofort"),
+
+    BANCONTACT("bancontact"),
+
+    GOOGLE_PAY("google_pay"),
+
+    DOTPAY("dotpay"),
+
+    GIROPAY("giropay"),
+
+    APPLE_PAY("apple_pay"),
+
+    UPI("upi"),
+
+    NETBANKING_EMANDATES("netbanking_emandates"),
+
+    PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+    DIRECT_DEBIT("direct_debit"),
+
+    BOLETO("boleto"),
+
+    VENMO("venmo"),
+
+    AMAZON_PAYMENTS("amazon_payments"),
+
+    PAY_TO("pay_to"),
+
+    FASTER_PAYMENTS("faster_payments"),
+
+    SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+    KLARNA_PAY_NOW("klarna_pay_now"),
+
+    ONLINE_BANKING_POLAND("online_banking_poland"),
+
+    PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+    ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+    KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+    PAY_BY_BANK("pay_by_bank"),
+
+    TRUSTLY("trustly"),
+
+    STABLECOIN("stablecoin"),
+
+    /** An enum member indicating that PaymentMethodType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentMethodType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentMethodType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentIntent/PaymentIntentCreateResponse.java b/src/main/java/com/chargebee/v4/models/paymentIntent/responses/PaymentIntentCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentIntent/PaymentIntentCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentIntent/responses/PaymentIntentCreateResponse.java
index 930b3712..650d0317 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentIntent/PaymentIntentCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentIntent/responses/PaymentIntentCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.paymentIntent;
+package com.chargebee.v4.models.paymentIntent.responses;
 
-import com.chargebee.v4.core.models.paymentIntent.PaymentIntent;
+import com.chargebee.v4.models.paymentIntent.PaymentIntent;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/paymentIntent/responses/PaymentIntentRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/paymentIntent/responses/PaymentIntentRetrieveResponse.java
new file mode 100644
index 00000000..3e64050e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentIntent/responses/PaymentIntentRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.paymentIntent.responses;
+
+import com.chargebee.v4.models.paymentIntent.PaymentIntent;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for PaymentIntentRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class PaymentIntentRetrieveResponse extends BaseResponse {
+  private final PaymentIntent paymentIntent;
+
+  private PaymentIntentRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.paymentIntent = builder.paymentIntent;
+  }
+
+  /** Parse JSON response into PaymentIntentRetrieveResponse object. */
+  public static PaymentIntentRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into PaymentIntentRetrieveResponse object with HTTP response. */
+  public static PaymentIntentRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __paymentIntentJson = JsonUtil.getObject(json, "payment_intent");
+      if (__paymentIntentJson != null) {
+        builder.paymentIntent(PaymentIntent.fromJson(__paymentIntentJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse PaymentIntentRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for PaymentIntentRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for PaymentIntentRetrieveResponse. */
+  public static class Builder {
+
+    private PaymentIntent paymentIntent;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder paymentIntent(PaymentIntent paymentIntent) {
+      this.paymentIntent = paymentIntent;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public PaymentIntentRetrieveResponse build() {
+      return new PaymentIntentRetrieveResponse(this);
+    }
+  }
+
+  /** Get the paymentIntent from the response. */
+  public PaymentIntent getPaymentIntent() {
+    return paymentIntent;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentIntent/PaymentIntentUpdateResponse.java b/src/main/java/com/chargebee/v4/models/paymentIntent/responses/PaymentIntentUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentIntent/PaymentIntentUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentIntent/responses/PaymentIntentUpdateResponse.java
index 26886222..63d1b1a6 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentIntent/PaymentIntentUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentIntent/responses/PaymentIntentUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.paymentIntent;
+package com.chargebee.v4.models.paymentIntent.responses;
 
-import com.chargebee.v4.core.models.paymentIntent.PaymentIntent;
+import com.chargebee.v4.models.paymentIntent.PaymentIntent;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentReferenceNumber/PaymentReferenceNumber.java b/src/main/java/com/chargebee/v4/models/paymentReferenceNumber/PaymentReferenceNumber.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/paymentReferenceNumber/PaymentReferenceNumber.java
rename to src/main/java/com/chargebee/v4/models/paymentReferenceNumber/PaymentReferenceNumber.java
index 8446862c..94ecc066 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentReferenceNumber/PaymentReferenceNumber.java
+++ b/src/main/java/com/chargebee/v4/models/paymentReferenceNumber/PaymentReferenceNumber.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentReferenceNumber;
+package com.chargebee.v4.models.paymentReferenceNumber;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSchedule/PaymentSchedule.java b/src/main/java/com/chargebee/v4/models/paymentSchedule/PaymentSchedule.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/paymentSchedule/PaymentSchedule.java
rename to src/main/java/com/chargebee/v4/models/paymentSchedule/PaymentSchedule.java
index 9ff32ad8..09bbbf84 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSchedule/PaymentSchedule.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSchedule/PaymentSchedule.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentSchedule;
+package com.chargebee.v4.models.paymentSchedule;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentScheduleEstimate/PaymentScheduleEstimate.java b/src/main/java/com/chargebee/v4/models/paymentScheduleEstimate/PaymentScheduleEstimate.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/paymentScheduleEstimate/PaymentScheduleEstimate.java
rename to src/main/java/com/chargebee/v4/models/paymentScheduleEstimate/PaymentScheduleEstimate.java
index 935a9bf3..778da6dd 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentScheduleEstimate/PaymentScheduleEstimate.java
+++ b/src/main/java/com/chargebee/v4/models/paymentScheduleEstimate/PaymentScheduleEstimate.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentScheduleEstimate;
+package com.chargebee.v4.models.paymentScheduleEstimate;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentScheduleScheme/PaymentScheduleScheme.java b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/PaymentScheduleScheme.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/paymentScheduleScheme/PaymentScheduleScheme.java
rename to src/main/java/com/chargebee/v4/models/paymentScheduleScheme/PaymentScheduleScheme.java
index 8c40ba53..6793f31e 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentScheduleScheme/PaymentScheduleScheme.java
+++ b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/PaymentScheduleScheme.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentScheduleScheme;
+package com.chargebee.v4.models.paymentScheduleScheme;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.math.BigDecimal;
diff --git a/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/params/PaymentScheduleSchemeCreateParams.java b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/params/PaymentScheduleSchemeCreateParams.java
new file mode 100644
index 00000000..d9691bab
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/params/PaymentScheduleSchemeCreateParams.java
@@ -0,0 +1,251 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentScheduleScheme.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.math.BigDecimal;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class PaymentScheduleSchemeCreateParams {
+
+  private final Integer numberOfSchedules;
+
+  private final PeriodUnit periodUnit;
+
+  private final Integer period;
+
+  private final String name;
+
+  private final List<FlexibleSchedulesParams> flexibleSchedules;
+
+  private PaymentScheduleSchemeCreateParams(PaymentScheduleSchemeCreateBuilder builder) {
+
+    this.numberOfSchedules = builder.numberOfSchedules;
+
+    this.periodUnit = builder.periodUnit;
+
+    this.period = builder.period;
+
+    this.name = builder.name;
+
+    this.flexibleSchedules = builder.flexibleSchedules;
+  }
+
+  public Integer getNumberOfSchedules() {
+    return numberOfSchedules;
+  }
+
+  public PeriodUnit getPeriodUnit() {
+    return periodUnit;
+  }
+
+  public Integer getPeriod() {
+    return period;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public List<FlexibleSchedulesParams> getFlexibleSchedules() {
+    return flexibleSchedules;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.numberOfSchedules != null) {
+
+      formData.put("number_of_schedules", this.numberOfSchedules);
+    }
+
+    if (this.periodUnit != null) {
+
+      formData.put("period_unit", this.periodUnit);
+    }
+
+    if (this.period != null) {
+
+      formData.put("period", this.period);
+    }
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.flexibleSchedules != null) {
+
+      // List of objects
+      for (int i = 0; i < this.flexibleSchedules.size(); i++) {
+        FlexibleSchedulesParams item = this.flexibleSchedules.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "flexible_schedules[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentScheduleSchemeCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentScheduleSchemeCreateBuilder builder() {
+    return new PaymentScheduleSchemeCreateBuilder();
+  }
+
+  public static final class PaymentScheduleSchemeCreateBuilder {
+
+    private Integer numberOfSchedules;
+
+    private PeriodUnit periodUnit;
+
+    private Integer period;
+
+    private String name;
+
+    private List<FlexibleSchedulesParams> flexibleSchedules;
+
+    private PaymentScheduleSchemeCreateBuilder() {}
+
+    public PaymentScheduleSchemeCreateBuilder numberOfSchedules(Integer value) {
+      this.numberOfSchedules = value;
+      return this;
+    }
+
+    public PaymentScheduleSchemeCreateBuilder periodUnit(PeriodUnit value) {
+      this.periodUnit = value;
+      return this;
+    }
+
+    public PaymentScheduleSchemeCreateBuilder period(Integer value) {
+      this.period = value;
+      return this;
+    }
+
+    public PaymentScheduleSchemeCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public PaymentScheduleSchemeCreateBuilder flexibleSchedules(
+        List<FlexibleSchedulesParams> value) {
+      this.flexibleSchedules = value;
+      return this;
+    }
+
+    public PaymentScheduleSchemeCreateParams build() {
+      return new PaymentScheduleSchemeCreateParams(this);
+    }
+  }
+
+  public enum PeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PeriodUnit enumValue : PeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class FlexibleSchedulesParams {
+
+    private final Integer period;
+
+    private final BigDecimal amountPercentage;
+
+    private FlexibleSchedulesParams(FlexibleSchedulesBuilder builder) {
+
+      this.period = builder.period;
+
+      this.amountPercentage = builder.amountPercentage;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public BigDecimal getAmountPercentage() {
+      return amountPercentage;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.amountPercentage != null) {
+
+        formData.put("amount_percentage", this.amountPercentage);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for FlexibleSchedulesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static FlexibleSchedulesBuilder builder() {
+      return new FlexibleSchedulesBuilder();
+    }
+
+    public static final class FlexibleSchedulesBuilder {
+
+      private Integer period;
+
+      private BigDecimal amountPercentage;
+
+      private FlexibleSchedulesBuilder() {}
+
+      public FlexibleSchedulesBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public FlexibleSchedulesBuilder amountPercentage(BigDecimal value) {
+        this.amountPercentage = value;
+        return this;
+      }
+
+      public FlexibleSchedulesParams build() {
+        return new FlexibleSchedulesParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentScheduleScheme/params/PaymentScheduleSchemeDeleteParams.java b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/params/PaymentScheduleSchemeDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/paymentScheduleScheme/params/PaymentScheduleSchemeDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/paymentScheduleScheme/params/PaymentScheduleSchemeDeleteParams.java
index 6fb84611..938814c5 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentScheduleScheme/params/PaymentScheduleSchemeDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/params/PaymentScheduleSchemeDeleteParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.paymentScheduleScheme.params;
+package com.chargebee.v4.models.paymentScheduleScheme.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class PaymentScheduleSchemeDeleteParams {
 
-  private final Map<String, Object> formData;
-
-  private PaymentScheduleSchemeDeleteParams(PaymentScheduleSchemeDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private PaymentScheduleSchemeDeleteParams(PaymentScheduleSchemeDeleteBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static PaymentScheduleSchemeDeleteBuilder builder() {
   }
 
   public static final class PaymentScheduleSchemeDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private PaymentScheduleSchemeDeleteBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentScheduleScheme/params/PaymentScheduleSchemeRetrieveParams.java b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/params/PaymentScheduleSchemeRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/paymentScheduleScheme/params/PaymentScheduleSchemeRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/paymentScheduleScheme/params/PaymentScheduleSchemeRetrieveParams.java
index 1d2a0d89..b66b861e 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentScheduleScheme/params/PaymentScheduleSchemeRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/params/PaymentScheduleSchemeRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentScheduleScheme.params;
+package com.chargebee.v4.models.paymentScheduleScheme.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentScheduleScheme/PaymentScheduleSchemeCreateResponse.java b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/responses/PaymentScheduleSchemeCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentScheduleScheme/PaymentScheduleSchemeCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentScheduleScheme/responses/PaymentScheduleSchemeCreateResponse.java
index c5cf419c..bf49f412 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentScheduleScheme/PaymentScheduleSchemeCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/responses/PaymentScheduleSchemeCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.paymentScheduleScheme;
+package com.chargebee.v4.models.paymentScheduleScheme.responses;
 
-import com.chargebee.v4.core.models.paymentScheduleScheme.PaymentScheduleScheme;
+import com.chargebee.v4.models.paymentScheduleScheme.PaymentScheduleScheme;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentScheduleScheme/PaymentScheduleSchemeDeleteResponse.java b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/responses/PaymentScheduleSchemeDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentScheduleScheme/PaymentScheduleSchemeDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentScheduleScheme/responses/PaymentScheduleSchemeDeleteResponse.java
index 5f2ae5a9..7cd070a1 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentScheduleScheme/PaymentScheduleSchemeDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/responses/PaymentScheduleSchemeDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.paymentScheduleScheme;
+package com.chargebee.v4.models.paymentScheduleScheme.responses;
 
-import com.chargebee.v4.core.models.paymentScheduleScheme.PaymentScheduleScheme;
+import com.chargebee.v4.models.paymentScheduleScheme.PaymentScheduleScheme;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/responses/PaymentScheduleSchemeRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/responses/PaymentScheduleSchemeRetrieveResponse.java
new file mode 100644
index 00000000..38e8a787
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentScheduleScheme/responses/PaymentScheduleSchemeRetrieveResponse.java
@@ -0,0 +1,78 @@
+package com.chargebee.v4.models.paymentScheduleScheme.responses;
+
+import com.chargebee.v4.models.paymentScheduleScheme.PaymentScheduleScheme;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for PaymentScheduleSchemeRetrieve operation. Contains the response data
+ * from a single resource get operation.
+ */
+public final class PaymentScheduleSchemeRetrieveResponse extends BaseResponse {
+  private final PaymentScheduleScheme paymentScheduleScheme;
+
+  private PaymentScheduleSchemeRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.paymentScheduleScheme = builder.paymentScheduleScheme;
+  }
+
+  /** Parse JSON response into PaymentScheduleSchemeRetrieveResponse object. */
+  public static PaymentScheduleSchemeRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into PaymentScheduleSchemeRetrieveResponse object with HTTP response. */
+  public static PaymentScheduleSchemeRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __paymentScheduleSchemeJson = JsonUtil.getObject(json, "payment_schedule_scheme");
+      if (__paymentScheduleSchemeJson != null) {
+        builder.paymentScheduleScheme(PaymentScheduleScheme.fromJson(__paymentScheduleSchemeJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse PaymentScheduleSchemeRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for PaymentScheduleSchemeRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for PaymentScheduleSchemeRetrieveResponse. */
+  public static class Builder {
+
+    private PaymentScheduleScheme paymentScheduleScheme;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder paymentScheduleScheme(PaymentScheduleScheme paymentScheduleScheme) {
+      this.paymentScheduleScheme = paymentScheduleScheme;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public PaymentScheduleSchemeRetrieveResponse build() {
+      return new PaymentScheduleSchemeRetrieveResponse(this);
+    }
+  }
+
+  /** Get the paymentScheduleScheme from the response. */
+  public PaymentScheduleScheme getPaymentScheduleScheme() {
+    return paymentScheduleScheme;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/PaymentSource.java b/src/main/java/com/chargebee/v4/models/paymentSource/PaymentSource.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/paymentSource/PaymentSource.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/PaymentSource.java
index b6b2d51e..538f752c 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/PaymentSource.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/PaymentSource.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentSource;
+package com.chargebee.v4.models.paymentSource;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -185,6 +185,16 @@ public enum Type {
 
     PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
 
+    ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+    KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+    PAY_BY_BANK("pay_by_bank"),
+
+    TRUSTLY("trustly"),
+
+    STABLECOIN("stablecoin"),
+
     /** An enum member indicating that Type was instantiated with an unknown value. */
     _UNKNOWN(null);
     private final String value;
@@ -353,6 +363,8 @@ public enum Gateway {
 
     DEUTSCHE_BANK("deutsche_bank"),
 
+    EZIDEBIT("ezidebit"),
+
     NOT_APPLICABLE("not_applicable"),
 
     /** An enum member indicating that Gateway was instantiated with an unknown value. */
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/params/CreateVoucherPaymentSourceParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/CreateVoucherPaymentSourceParams.java
new file mode 100644
index 00000000..8e010b62
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/CreateVoucherPaymentSourceParams.java
@@ -0,0 +1,221 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentSource.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class CreateVoucherPaymentSourceParams {
+
+  private final String customerId;
+
+  private final VoucherPaymentSourceParams voucherPaymentSource;
+
+  private CreateVoucherPaymentSourceParams(CreateVoucherPaymentSourceBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.voucherPaymentSource = builder.voucherPaymentSource;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public VoucherPaymentSourceParams getVoucherPaymentSource() {
+    return voucherPaymentSource;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.voucherPaymentSource != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.voucherPaymentSource.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "voucher_payment_source[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CreateVoucherPaymentSourceParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreateVoucherPaymentSourceBuilder builder() {
+    return new CreateVoucherPaymentSourceBuilder();
+  }
+
+  public static final class CreateVoucherPaymentSourceBuilder {
+
+    private String customerId;
+
+    private VoucherPaymentSourceParams voucherPaymentSource;
+
+    private CreateVoucherPaymentSourceBuilder() {}
+
+    public CreateVoucherPaymentSourceBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public CreateVoucherPaymentSourceBuilder voucherPaymentSource(
+        VoucherPaymentSourceParams value) {
+      this.voucherPaymentSource = value;
+      return this;
+    }
+
+    public CreateVoucherPaymentSourceParams build() {
+      return new CreateVoucherPaymentSourceParams(this);
+    }
+  }
+
+  public static final class VoucherPaymentSourceParams {
+
+    private final VoucherType voucherType;
+
+    private final String gatewayAccountId;
+
+    private final String taxId;
+
+    private final java.util.Map<String, Object> billingAddress;
+
+    private VoucherPaymentSourceParams(VoucherPaymentSourceBuilder builder) {
+
+      this.voucherType = builder.voucherType;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.taxId = builder.taxId;
+
+      this.billingAddress = builder.billingAddress;
+    }
+
+    public VoucherType getVoucherType() {
+      return voucherType;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getTaxId() {
+      return taxId;
+    }
+
+    public java.util.Map<String, Object> getBillingAddress() {
+      return billingAddress;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.voucherType != null) {
+
+        formData.put("voucher_type", this.voucherType);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.taxId != null) {
+
+        formData.put("tax_id", this.taxId);
+      }
+
+      if (this.billingAddress != null) {
+
+        formData.put("billing_address", JsonUtil.toJson(this.billingAddress));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for VoucherPaymentSourceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static VoucherPaymentSourceBuilder builder() {
+      return new VoucherPaymentSourceBuilder();
+    }
+
+    public static final class VoucherPaymentSourceBuilder {
+
+      private VoucherType voucherType;
+
+      private String gatewayAccountId;
+
+      private String taxId;
+
+      private java.util.Map<String, Object> billingAddress;
+
+      private VoucherPaymentSourceBuilder() {}
+
+      public VoucherPaymentSourceBuilder voucherType(VoucherType value) {
+        this.voucherType = value;
+        return this;
+      }
+
+      public VoucherPaymentSourceBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public VoucherPaymentSourceBuilder taxId(String value) {
+        this.taxId = value;
+        return this;
+      }
+
+      public VoucherPaymentSourceBuilder billingAddress(java.util.Map<String, Object> value) {
+        this.billingAddress = value;
+        return this;
+      }
+
+      public VoucherPaymentSourceParams build() {
+        return new VoucherPaymentSourceParams(this);
+      }
+    }
+
+    public enum VoucherType {
+      BOLETO("boleto"),
+
+      /** An enum member indicating that VoucherType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      VoucherType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static VoucherType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (VoucherType enumValue : VoucherType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/params/ExportPaymentSourceParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/ExportPaymentSourceParams.java
new file mode 100644
index 00000000..034880e9
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/ExportPaymentSourceParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentSource.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ExportPaymentSourceParams {
+
+  private final String gatewayAccountId;
+
+  private ExportPaymentSourceParams(ExportPaymentSourceBuilder builder) {
+
+    this.gatewayAccountId = builder.gatewayAccountId;
+  }
+
+  public String getGatewayAccountId() {
+    return gatewayAccountId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.gatewayAccountId != null) {
+
+      formData.put("gateway_account_id", this.gatewayAccountId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ExportPaymentSourceParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ExportPaymentSourceBuilder builder() {
+    return new ExportPaymentSourceBuilder();
+  }
+
+  public static final class ExportPaymentSourceBuilder {
+
+    private String gatewayAccountId;
+
+    private ExportPaymentSourceBuilder() {}
+
+    public ExportPaymentSourceBuilder gatewayAccountId(String value) {
+      this.gatewayAccountId = value;
+      return this;
+    }
+
+    public ExportPaymentSourceParams build() {
+      return new ExportPaymentSourceParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceAgreementPdfParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceAgreementPdfParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceAgreementPdfParams.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceAgreementPdfParams.java
index 8639308c..1af071fa 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceAgreementPdfParams.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceAgreementPdfParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.paymentSource.params;
+package com.chargebee.v4.models.paymentSource.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class PaymentSourceAgreementPdfParams {
 
-  private final Map<String, Object> formData;
-
-  private PaymentSourceAgreementPdfParams(PaymentSourceAgreementPdfBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private PaymentSourceAgreementPdfParams(PaymentSourceAgreementPdfBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static PaymentSourceAgreementPdfBuilder builder() {
   }
 
   public static final class PaymentSourceAgreementPdfBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private PaymentSourceAgreementPdfBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateBankAccountParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateBankAccountParams.java
new file mode 100644
index 00000000..0cd51d56
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateBankAccountParams.java
@@ -0,0 +1,566 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentSource.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentSourceCreateBankAccountParams {
+
+  private final String customerId;
+
+  private final String issuingCountry;
+
+  private final Boolean replacePrimaryPaymentSource;
+
+  private final BankAccountParams bankAccount;
+
+  private PaymentSourceCreateBankAccountParams(PaymentSourceCreateBankAccountBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.issuingCountry = builder.issuingCountry;
+
+    this.replacePrimaryPaymentSource = builder.replacePrimaryPaymentSource;
+
+    this.bankAccount = builder.bankAccount;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getIssuingCountry() {
+    return issuingCountry;
+  }
+
+  public Boolean getReplacePrimaryPaymentSource() {
+    return replacePrimaryPaymentSource;
+  }
+
+  public BankAccountParams getBankAccount() {
+    return bankAccount;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.issuingCountry != null) {
+
+      formData.put("issuing_country", this.issuingCountry);
+    }
+
+    if (this.replacePrimaryPaymentSource != null) {
+
+      formData.put("replace_primary_payment_source", this.replacePrimaryPaymentSource);
+    }
+
+    if (this.bankAccount != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.bankAccount.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "bank_account[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentSourceCreateBankAccountParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentSourceCreateBankAccountBuilder builder() {
+    return new PaymentSourceCreateBankAccountBuilder();
+  }
+
+  public static final class PaymentSourceCreateBankAccountBuilder {
+
+    private String customerId;
+
+    private String issuingCountry;
+
+    private Boolean replacePrimaryPaymentSource;
+
+    private BankAccountParams bankAccount;
+
+    private PaymentSourceCreateBankAccountBuilder() {}
+
+    public PaymentSourceCreateBankAccountBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PaymentSourceCreateBankAccountBuilder issuingCountry(String value) {
+      this.issuingCountry = value;
+      return this;
+    }
+
+    public PaymentSourceCreateBankAccountBuilder replacePrimaryPaymentSource(Boolean value) {
+      this.replacePrimaryPaymentSource = value;
+      return this;
+    }
+
+    public PaymentSourceCreateBankAccountBuilder bankAccount(BankAccountParams value) {
+      this.bankAccount = value;
+      return this;
+    }
+
+    public PaymentSourceCreateBankAccountParams build() {
+      return new PaymentSourceCreateBankAccountParams(this);
+    }
+  }
+
+  public static final class BankAccountParams {
+
+    private final String gatewayAccountId;
+
+    private final String iban;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String company;
+
+    private final String email;
+
+    private final String phone;
+
+    private final String bankName;
+
+    private final String accountNumber;
+
+    private final String routingNumber;
+
+    private final String bankCode;
+
+    private final AccountType accountType;
+
+    private final AccountHolderType accountHolderType;
+
+    private final EcheckType echeckType;
+
+    private final String swedishIdentityNumber;
+
+    private final java.util.Map<String, Object> billingAddress;
+
+    private BankAccountParams(BankAccountBuilder builder) {
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.iban = builder.iban;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.company = builder.company;
+
+      this.email = builder.email;
+
+      this.phone = builder.phone;
+
+      this.bankName = builder.bankName;
+
+      this.accountNumber = builder.accountNumber;
+
+      this.routingNumber = builder.routingNumber;
+
+      this.bankCode = builder.bankCode;
+
+      this.accountType = builder.accountType;
+
+      this.accountHolderType = builder.accountHolderType;
+
+      this.echeckType = builder.echeckType;
+
+      this.swedishIdentityNumber = builder.swedishIdentityNumber;
+
+      this.billingAddress = builder.billingAddress;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getIban() {
+      return iban;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getBankName() {
+      return bankName;
+    }
+
+    public String getAccountNumber() {
+      return accountNumber;
+    }
+
+    public String getRoutingNumber() {
+      return routingNumber;
+    }
+
+    public String getBankCode() {
+      return bankCode;
+    }
+
+    public AccountType getAccountType() {
+      return accountType;
+    }
+
+    public AccountHolderType getAccountHolderType() {
+      return accountHolderType;
+    }
+
+    public EcheckType getEcheckType() {
+      return echeckType;
+    }
+
+    public String getSwedishIdentityNumber() {
+      return swedishIdentityNumber;
+    }
+
+    public java.util.Map<String, Object> getBillingAddress() {
+      return billingAddress;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.iban != null) {
+
+        formData.put("iban", this.iban);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.bankName != null) {
+
+        formData.put("bank_name", this.bankName);
+      }
+
+      if (this.accountNumber != null) {
+
+        formData.put("account_number", this.accountNumber);
+      }
+
+      if (this.routingNumber != null) {
+
+        formData.put("routing_number", this.routingNumber);
+      }
+
+      if (this.bankCode != null) {
+
+        formData.put("bank_code", this.bankCode);
+      }
+
+      if (this.accountType != null) {
+
+        formData.put("account_type", this.accountType);
+      }
+
+      if (this.accountHolderType != null) {
+
+        formData.put("account_holder_type", this.accountHolderType);
+      }
+
+      if (this.echeckType != null) {
+
+        formData.put("echeck_type", this.echeckType);
+      }
+
+      if (this.swedishIdentityNumber != null) {
+
+        formData.put("swedish_identity_number", this.swedishIdentityNumber);
+      }
+
+      if (this.billingAddress != null) {
+
+        formData.put("billing_address", JsonUtil.toJson(this.billingAddress));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BankAccountParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BankAccountBuilder builder() {
+      return new BankAccountBuilder();
+    }
+
+    public static final class BankAccountBuilder {
+
+      private String gatewayAccountId;
+
+      private String iban;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String company;
+
+      private String email;
+
+      private String phone;
+
+      private String bankName;
+
+      private String accountNumber;
+
+      private String routingNumber;
+
+      private String bankCode;
+
+      private AccountType accountType;
+
+      private AccountHolderType accountHolderType;
+
+      private EcheckType echeckType;
+
+      private String swedishIdentityNumber;
+
+      private java.util.Map<String, Object> billingAddress;
+
+      private BankAccountBuilder() {}
+
+      public BankAccountBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public BankAccountBuilder iban(String value) {
+        this.iban = value;
+        return this;
+      }
+
+      public BankAccountBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BankAccountBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BankAccountBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BankAccountBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BankAccountBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BankAccountBuilder bankName(String value) {
+        this.bankName = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountNumber(String value) {
+        this.accountNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder routingNumber(String value) {
+        this.routingNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder bankCode(String value) {
+        this.bankCode = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountType(AccountType value) {
+        this.accountType = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountHolderType(AccountHolderType value) {
+        this.accountHolderType = value;
+        return this;
+      }
+
+      public BankAccountBuilder echeckType(EcheckType value) {
+        this.echeckType = value;
+        return this;
+      }
+
+      public BankAccountBuilder swedishIdentityNumber(String value) {
+        this.swedishIdentityNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder billingAddress(java.util.Map<String, Object> value) {
+        this.billingAddress = value;
+        return this;
+      }
+
+      public BankAccountParams build() {
+        return new BankAccountParams(this);
+      }
+    }
+
+    public enum AccountType {
+      CHECKING("checking"),
+
+      SAVINGS("savings"),
+
+      BUSINESS_CHECKING("business_checking"),
+
+      CURRENT("current"),
+
+      /** An enum member indicating that AccountType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AccountType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AccountType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AccountType enumValue : AccountType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum AccountHolderType {
+      INDIVIDUAL("individual"),
+
+      COMPANY("company"),
+
+      /**
+       * An enum member indicating that AccountHolderType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      AccountHolderType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AccountHolderType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AccountHolderType enumValue : AccountHolderType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum EcheckType {
+      WEB("web"),
+
+      PPD("ppd"),
+
+      CCD("ccd"),
+
+      /** An enum member indicating that EcheckType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EcheckType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EcheckType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EcheckType enumValue : EcheckType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateCardParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateCardParams.java
new file mode 100644
index 00000000..12c2958f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateCardParams.java
@@ -0,0 +1,484 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentSource.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentSourceCreateCardParams {
+
+  private final String customerId;
+
+  private final Boolean replacePrimaryPaymentSource;
+
+  private final CardParams card;
+
+  private PaymentSourceCreateCardParams(PaymentSourceCreateCardBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.replacePrimaryPaymentSource = builder.replacePrimaryPaymentSource;
+
+    this.card = builder.card;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public Boolean getReplacePrimaryPaymentSource() {
+    return replacePrimaryPaymentSource;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.replacePrimaryPaymentSource != null) {
+
+      formData.put("replace_primary_payment_source", this.replacePrimaryPaymentSource);
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentSourceCreateCardParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentSourceCreateCardBuilder builder() {
+    return new PaymentSourceCreateCardBuilder();
+  }
+
+  public static final class PaymentSourceCreateCardBuilder {
+
+    private String customerId;
+
+    private Boolean replacePrimaryPaymentSource;
+
+    private CardParams card;
+
+    private PaymentSourceCreateCardBuilder() {}
+
+    public PaymentSourceCreateCardBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PaymentSourceCreateCardBuilder replacePrimaryPaymentSource(Boolean value) {
+      this.replacePrimaryPaymentSource = value;
+      return this;
+    }
+
+    public PaymentSourceCreateCardBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public PaymentSourceCreateCardParams build() {
+      return new PaymentSourceCreateCardParams(this);
+    }
+  }
+
+  public static final class CardParams {
+
+    private final String gatewayAccountId;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String number;
+
+    private final Integer expiryMonth;
+
+    private final Integer expiryYear;
+
+    private final String cvv;
+
+    private final PreferredScheme preferredScheme;
+
+    private final String billingAddr1;
+
+    private final String billingAddr2;
+
+    private final String billingCity;
+
+    private final String billingStateCode;
+
+    private final String billingState;
+
+    private final String billingZip;
+
+    private final String billingCountry;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.number = builder.number;
+
+      this.expiryMonth = builder.expiryMonth;
+
+      this.expiryYear = builder.expiryYear;
+
+      this.cvv = builder.cvv;
+
+      this.preferredScheme = builder.preferredScheme;
+
+      this.billingAddr1 = builder.billingAddr1;
+
+      this.billingAddr2 = builder.billingAddr2;
+
+      this.billingCity = builder.billingCity;
+
+      this.billingStateCode = builder.billingStateCode;
+
+      this.billingState = builder.billingState;
+
+      this.billingZip = builder.billingZip;
+
+      this.billingCountry = builder.billingCountry;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getNumber() {
+      return number;
+    }
+
+    public Integer getExpiryMonth() {
+      return expiryMonth;
+    }
+
+    public Integer getExpiryYear() {
+      return expiryYear;
+    }
+
+    public String getCvv() {
+      return cvv;
+    }
+
+    public PreferredScheme getPreferredScheme() {
+      return preferredScheme;
+    }
+
+    public String getBillingAddr1() {
+      return billingAddr1;
+    }
+
+    public String getBillingAddr2() {
+      return billingAddr2;
+    }
+
+    public String getBillingCity() {
+      return billingCity;
+    }
+
+    public String getBillingStateCode() {
+      return billingStateCode;
+    }
+
+    public String getBillingState() {
+      return billingState;
+    }
+
+    public String getBillingZip() {
+      return billingZip;
+    }
+
+    public String getBillingCountry() {
+      return billingCountry;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.number != null) {
+
+        formData.put("number", this.number);
+      }
+
+      if (this.expiryMonth != null) {
+
+        formData.put("expiry_month", this.expiryMonth);
+      }
+
+      if (this.expiryYear != null) {
+
+        formData.put("expiry_year", this.expiryYear);
+      }
+
+      if (this.cvv != null) {
+
+        formData.put("cvv", this.cvv);
+      }
+
+      if (this.preferredScheme != null) {
+
+        formData.put("preferred_scheme", this.preferredScheme);
+      }
+
+      if (this.billingAddr1 != null) {
+
+        formData.put("billing_addr1", this.billingAddr1);
+      }
+
+      if (this.billingAddr2 != null) {
+
+        formData.put("billing_addr2", this.billingAddr2);
+      }
+
+      if (this.billingCity != null) {
+
+        formData.put("billing_city", this.billingCity);
+      }
+
+      if (this.billingStateCode != null) {
+
+        formData.put("billing_state_code", this.billingStateCode);
+      }
+
+      if (this.billingState != null) {
+
+        formData.put("billing_state", this.billingState);
+      }
+
+      if (this.billingZip != null) {
+
+        formData.put("billing_zip", this.billingZip);
+      }
+
+      if (this.billingCountry != null) {
+
+        formData.put("billing_country", this.billingCountry);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private String gatewayAccountId;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String number;
+
+      private Integer expiryMonth;
+
+      private Integer expiryYear;
+
+      private String cvv;
+
+      private PreferredScheme preferredScheme;
+
+      private String billingAddr1;
+
+      private String billingAddr2;
+
+      private String billingCity;
+
+      private String billingStateCode;
+
+      private String billingState;
+
+      private String billingZip;
+
+      private String billingCountry;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private CardBuilder() {}
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public CardBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CardBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CardBuilder number(String value) {
+        this.number = value;
+        return this;
+      }
+
+      public CardBuilder expiryMonth(Integer value) {
+        this.expiryMonth = value;
+        return this;
+      }
+
+      public CardBuilder expiryYear(Integer value) {
+        this.expiryYear = value;
+        return this;
+      }
+
+      public CardBuilder cvv(String value) {
+        this.cvv = value;
+        return this;
+      }
+
+      public CardBuilder preferredScheme(PreferredScheme value) {
+        this.preferredScheme = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr1(String value) {
+        this.billingAddr1 = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr2(String value) {
+        this.billingAddr2 = value;
+        return this;
+      }
+
+      public CardBuilder billingCity(String value) {
+        this.billingCity = value;
+        return this;
+      }
+
+      public CardBuilder billingStateCode(String value) {
+        this.billingStateCode = value;
+        return this;
+      }
+
+      public CardBuilder billingState(String value) {
+        this.billingState = value;
+        return this;
+      }
+
+      public CardBuilder billingZip(String value) {
+        this.billingZip = value;
+        return this;
+      }
+
+      public CardBuilder billingCountry(String value) {
+        this.billingCountry = value;
+        return this;
+      }
+
+      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum PreferredScheme {
+      CARTES_BANCAIRES("cartes_bancaires"),
+
+      MASTERCARD("mastercard"),
+
+      VISA("visa"),
+
+      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PreferredScheme(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PreferredScheme fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PreferredScheme enumValue : PreferredScheme.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateUsingPaymentIntentParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateUsingPaymentIntentParams.java
new file mode 100644
index 00000000..9aeeb8c1
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateUsingPaymentIntentParams.java
@@ -0,0 +1,374 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentSource.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentSourceCreateUsingPaymentIntentParams {
+
+  private final String customerId;
+
+  private final Boolean replacePrimaryPaymentSource;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private PaymentSourceCreateUsingPaymentIntentParams(
+      PaymentSourceCreateUsingPaymentIntentBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.replacePrimaryPaymentSource = builder.replacePrimaryPaymentSource;
+
+    this.paymentIntent = builder.paymentIntent;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public Boolean getReplacePrimaryPaymentSource() {
+    return replacePrimaryPaymentSource;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.replacePrimaryPaymentSource != null) {
+
+      formData.put("replace_primary_payment_source", this.replacePrimaryPaymentSource);
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentSourceCreateUsingPaymentIntentParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentSourceCreateUsingPaymentIntentBuilder builder() {
+    return new PaymentSourceCreateUsingPaymentIntentBuilder();
+  }
+
+  public static final class PaymentSourceCreateUsingPaymentIntentBuilder {
+
+    private String customerId;
+
+    private Boolean replacePrimaryPaymentSource;
+
+    private PaymentIntentParams paymentIntent;
+
+    private PaymentSourceCreateUsingPaymentIntentBuilder() {}
+
+    public PaymentSourceCreateUsingPaymentIntentBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPaymentIntentBuilder replacePrimaryPaymentSource(Boolean value) {
+      this.replacePrimaryPaymentSource = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPaymentIntentBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPaymentIntentParams build() {
+      return new PaymentSourceCreateUsingPaymentIntentParams(this);
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInfo;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInfo = builder.additionalInfo;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInfo() {
+      return additionalInfo;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInfo != null) {
+
+        formData.put("additional_info", JsonUtil.toJson(this.additionalInfo));
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInfo;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInfo(java.util.Map<String, Object> value) {
+        this.additionalInfo = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateUsingPermanentTokenParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateUsingPermanentTokenParams.java
new file mode 100644
index 00000000..cf3c7b10
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateUsingPermanentTokenParams.java
@@ -0,0 +1,913 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentSource.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentSourceCreateUsingPermanentTokenParams {
+
+  private final String customerId;
+
+  private final Type type;
+
+  private final String gatewayAccountId;
+
+  private final String referenceId;
+
+  private final String issuingCountry;
+
+  private final Boolean replacePrimaryPaymentSource;
+
+  private final String paymentMethodToken;
+
+  private final String customerProfileToken;
+
+  private final String networkTransactionId;
+
+  private final String mandateId;
+
+  private final Boolean skipRetrieval;
+
+  private final java.util.Map<String, Object> additionalInformation;
+
+  private final CardParams card;
+
+  private final BillingAddressParams billingAddress;
+
+  private PaymentSourceCreateUsingPermanentTokenParams(
+      PaymentSourceCreateUsingPermanentTokenBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.type = builder.type;
+
+    this.gatewayAccountId = builder.gatewayAccountId;
+
+    this.referenceId = builder.referenceId;
+
+    this.issuingCountry = builder.issuingCountry;
+
+    this.replacePrimaryPaymentSource = builder.replacePrimaryPaymentSource;
+
+    this.paymentMethodToken = builder.paymentMethodToken;
+
+    this.customerProfileToken = builder.customerProfileToken;
+
+    this.networkTransactionId = builder.networkTransactionId;
+
+    this.mandateId = builder.mandateId;
+
+    this.skipRetrieval = builder.skipRetrieval;
+
+    this.additionalInformation = builder.additionalInformation;
+
+    this.card = builder.card;
+
+    this.billingAddress = builder.billingAddress;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public Type getType() {
+    return type;
+  }
+
+  public String getGatewayAccountId() {
+    return gatewayAccountId;
+  }
+
+  public String getReferenceId() {
+    return referenceId;
+  }
+
+  public String getIssuingCountry() {
+    return issuingCountry;
+  }
+
+  public Boolean getReplacePrimaryPaymentSource() {
+    return replacePrimaryPaymentSource;
+  }
+
+  public String getPaymentMethodToken() {
+    return paymentMethodToken;
+  }
+
+  public String getCustomerProfileToken() {
+    return customerProfileToken;
+  }
+
+  public String getNetworkTransactionId() {
+    return networkTransactionId;
+  }
+
+  public String getMandateId() {
+    return mandateId;
+  }
+
+  public Boolean getSkipRetrieval() {
+    return skipRetrieval;
+  }
+
+  public java.util.Map<String, Object> getAdditionalInformation() {
+    return additionalInformation;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.type != null) {
+
+      formData.put("type", this.type);
+    }
+
+    if (this.gatewayAccountId != null) {
+
+      formData.put("gateway_account_id", this.gatewayAccountId);
+    }
+
+    if (this.referenceId != null) {
+
+      formData.put("reference_id", this.referenceId);
+    }
+
+    if (this.issuingCountry != null) {
+
+      formData.put("issuing_country", this.issuingCountry);
+    }
+
+    if (this.replacePrimaryPaymentSource != null) {
+
+      formData.put("replace_primary_payment_source", this.replacePrimaryPaymentSource);
+    }
+
+    if (this.paymentMethodToken != null) {
+
+      formData.put("payment_method_token", this.paymentMethodToken);
+    }
+
+    if (this.customerProfileToken != null) {
+
+      formData.put("customer_profile_token", this.customerProfileToken);
+    }
+
+    if (this.networkTransactionId != null) {
+
+      formData.put("network_transaction_id", this.networkTransactionId);
+    }
+
+    if (this.mandateId != null) {
+
+      formData.put("mandate_id", this.mandateId);
+    }
+
+    if (this.skipRetrieval != null) {
+
+      formData.put("skip_retrieval", this.skipRetrieval);
+    }
+
+    if (this.additionalInformation != null) {
+
+      formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentSourceCreateUsingPermanentTokenParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentSourceCreateUsingPermanentTokenBuilder builder() {
+    return new PaymentSourceCreateUsingPermanentTokenBuilder();
+  }
+
+  public static final class PaymentSourceCreateUsingPermanentTokenBuilder {
+
+    private String customerId;
+
+    private Type type;
+
+    private String gatewayAccountId;
+
+    private String referenceId;
+
+    private String issuingCountry;
+
+    private Boolean replacePrimaryPaymentSource;
+
+    private String paymentMethodToken;
+
+    private String customerProfileToken;
+
+    private String networkTransactionId;
+
+    private String mandateId;
+
+    private Boolean skipRetrieval;
+
+    private java.util.Map<String, Object> additionalInformation;
+
+    private CardParams card;
+
+    private BillingAddressParams billingAddress;
+
+    private PaymentSourceCreateUsingPermanentTokenBuilder() {}
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder type(Type value) {
+      this.type = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder gatewayAccountId(String value) {
+      this.gatewayAccountId = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder referenceId(String value) {
+      this.referenceId = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder issuingCountry(String value) {
+      this.issuingCountry = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder replacePrimaryPaymentSource(
+        Boolean value) {
+      this.replacePrimaryPaymentSource = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder paymentMethodToken(String value) {
+      this.paymentMethodToken = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder customerProfileToken(String value) {
+      this.customerProfileToken = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder networkTransactionId(String value) {
+      this.networkTransactionId = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder mandateId(String value) {
+      this.mandateId = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder skipRetrieval(Boolean value) {
+      this.skipRetrieval = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder additionalInformation(
+        java.util.Map<String, Object> value) {
+      this.additionalInformation = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenBuilder billingAddress(
+        BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingPermanentTokenParams build() {
+      return new PaymentSourceCreateUsingPermanentTokenParams(this);
+    }
+  }
+
+  public enum Type {
+    CARD("card"),
+
+    PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+    AMAZON_PAYMENTS("amazon_payments"),
+
+    DIRECT_DEBIT("direct_debit"),
+
+    GENERIC("generic"),
+
+    ALIPAY("alipay"),
+
+    UNIONPAY("unionpay"),
+
+    APPLE_PAY("apple_pay"),
+
+    WECHAT_PAY("wechat_pay"),
+
+    IDEAL("ideal"),
+
+    GOOGLE_PAY("google_pay"),
+
+    SOFORT("sofort"),
+
+    BANCONTACT("bancontact"),
+
+    GIROPAY("giropay"),
+
+    DOTPAY("dotpay"),
+
+    UPI("upi"),
+
+    NETBANKING_EMANDATES("netbanking_emandates"),
+
+    VENMO("venmo"),
+
+    PAY_TO("pay_to"),
+
+    FASTER_PAYMENTS("faster_payments"),
+
+    SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+    AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
+
+    KLARNA_PAY_NOW("klarna_pay_now"),
+
+    ONLINE_BANKING_POLAND("online_banking_poland"),
+
+    PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+    ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+    KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+    PAY_BY_BANK("pay_by_bank"),
+
+    TRUSTLY("trustly"),
+
+    STABLECOIN("stablecoin"),
+
+    /** An enum member indicating that Type was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Type(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Type fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Type enumValue : Type.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class CardParams {
+
+    private final String last4;
+
+    private final String iin;
+
+    private final Integer expiryMonth;
+
+    private final Integer expiryYear;
+
+    private final Brand brand;
+
+    private final FundingType fundingType;
+
+    private CardParams(CardBuilder builder) {
+
+      this.last4 = builder.last4;
+
+      this.iin = builder.iin;
+
+      this.expiryMonth = builder.expiryMonth;
+
+      this.expiryYear = builder.expiryYear;
+
+      this.brand = builder.brand;
+
+      this.fundingType = builder.fundingType;
+    }
+
+    public String getLast4() {
+      return last4;
+    }
+
+    public String getIin() {
+      return iin;
+    }
+
+    public Integer getExpiryMonth() {
+      return expiryMonth;
+    }
+
+    public Integer getExpiryYear() {
+      return expiryYear;
+    }
+
+    public Brand getBrand() {
+      return brand;
+    }
+
+    public FundingType getFundingType() {
+      return fundingType;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.last4 != null) {
+
+        formData.put("last4", this.last4);
+      }
+
+      if (this.iin != null) {
+
+        formData.put("iin", this.iin);
+      }
+
+      if (this.expiryMonth != null) {
+
+        formData.put("expiry_month", this.expiryMonth);
+      }
+
+      if (this.expiryYear != null) {
+
+        formData.put("expiry_year", this.expiryYear);
+      }
+
+      if (this.brand != null) {
+
+        formData.put("brand", this.brand);
+      }
+
+      if (this.fundingType != null) {
+
+        formData.put("funding_type", this.fundingType);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private String last4;
+
+      private String iin;
+
+      private Integer expiryMonth;
+
+      private Integer expiryYear;
+
+      private Brand brand;
+
+      private FundingType fundingType;
+
+      private CardBuilder() {}
+
+      public CardBuilder last4(String value) {
+        this.last4 = value;
+        return this;
+      }
+
+      public CardBuilder iin(String value) {
+        this.iin = value;
+        return this;
+      }
+
+      public CardBuilder expiryMonth(Integer value) {
+        this.expiryMonth = value;
+        return this;
+      }
+
+      public CardBuilder expiryYear(Integer value) {
+        this.expiryYear = value;
+        return this;
+      }
+
+      public CardBuilder brand(Brand value) {
+        this.brand = value;
+        return this;
+      }
+
+      public CardBuilder fundingType(FundingType value) {
+        this.fundingType = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Brand {
+      VISA("visa"),
+
+      MASTERCARD("mastercard"),
+
+      AMERICAN_EXPRESS("american_express"),
+
+      DISCOVER("discover"),
+
+      JCB("jcb"),
+
+      DINERS_CLUB("diners_club"),
+
+      OTHER("other"),
+
+      BANCONTACT("bancontact"),
+
+      CMR_FALABELLA("cmr_falabella"),
+
+      TARJETA_NARANJA("tarjeta_naranja"),
+
+      NATIVA("nativa"),
+
+      CENCOSUD("cencosud"),
+
+      CABAL("cabal"),
+
+      ARGENCARD("argencard"),
+
+      ELO("elo"),
+
+      HIPERCARD("hipercard"),
+
+      CARNET("carnet"),
+
+      RUPAY("rupay"),
+
+      MAESTRO("maestro"),
+
+      DANKORT("dankort"),
+
+      CARTES_BANCAIRES("cartes_bancaires"),
+
+      /** An enum member indicating that Brand was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Brand(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Brand fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Brand enumValue : Brand.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum FundingType {
+      CREDIT("credit"),
+
+      DEBIT("debit"),
+
+      PREPAID("prepaid"),
+
+      NOT_KNOWN("not_known"),
+
+      /** An enum member indicating that FundingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      FundingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static FundingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (FundingType enumValue : FundingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateUsingTempTokenParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateUsingTempTokenParams.java
new file mode 100644
index 00000000..21d2442c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateUsingTempTokenParams.java
@@ -0,0 +1,267 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentSource.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentSourceCreateUsingTempTokenParams {
+
+  private final String customerId;
+
+  private final String gatewayAccountId;
+
+  private final Type type;
+
+  private final String tmpToken;
+
+  private final String issuingCountry;
+
+  private final Boolean replacePrimaryPaymentSource;
+
+  private final java.util.Map<String, Object> additionalInformation;
+
+  private PaymentSourceCreateUsingTempTokenParams(
+      PaymentSourceCreateUsingTempTokenBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.gatewayAccountId = builder.gatewayAccountId;
+
+    this.type = builder.type;
+
+    this.tmpToken = builder.tmpToken;
+
+    this.issuingCountry = builder.issuingCountry;
+
+    this.replacePrimaryPaymentSource = builder.replacePrimaryPaymentSource;
+
+    this.additionalInformation = builder.additionalInformation;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getGatewayAccountId() {
+    return gatewayAccountId;
+  }
+
+  public Type getType() {
+    return type;
+  }
+
+  public String getTmpToken() {
+    return tmpToken;
+  }
+
+  public String getIssuingCountry() {
+    return issuingCountry;
+  }
+
+  public Boolean getReplacePrimaryPaymentSource() {
+    return replacePrimaryPaymentSource;
+  }
+
+  public java.util.Map<String, Object> getAdditionalInformation() {
+    return additionalInformation;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.gatewayAccountId != null) {
+
+      formData.put("gateway_account_id", this.gatewayAccountId);
+    }
+
+    if (this.type != null) {
+
+      formData.put("type", this.type);
+    }
+
+    if (this.tmpToken != null) {
+
+      formData.put("tmp_token", this.tmpToken);
+    }
+
+    if (this.issuingCountry != null) {
+
+      formData.put("issuing_country", this.issuingCountry);
+    }
+
+    if (this.replacePrimaryPaymentSource != null) {
+
+      formData.put("replace_primary_payment_source", this.replacePrimaryPaymentSource);
+    }
+
+    if (this.additionalInformation != null) {
+
+      formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentSourceCreateUsingTempTokenParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentSourceCreateUsingTempTokenBuilder builder() {
+    return new PaymentSourceCreateUsingTempTokenBuilder();
+  }
+
+  public static final class PaymentSourceCreateUsingTempTokenBuilder {
+
+    private String customerId;
+
+    private String gatewayAccountId;
+
+    private Type type;
+
+    private String tmpToken;
+
+    private String issuingCountry;
+
+    private Boolean replacePrimaryPaymentSource;
+
+    private java.util.Map<String, Object> additionalInformation;
+
+    private PaymentSourceCreateUsingTempTokenBuilder() {}
+
+    public PaymentSourceCreateUsingTempTokenBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingTempTokenBuilder gatewayAccountId(String value) {
+      this.gatewayAccountId = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingTempTokenBuilder type(Type value) {
+      this.type = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingTempTokenBuilder tmpToken(String value) {
+      this.tmpToken = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingTempTokenBuilder issuingCountry(String value) {
+      this.issuingCountry = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingTempTokenBuilder replacePrimaryPaymentSource(Boolean value) {
+      this.replacePrimaryPaymentSource = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingTempTokenBuilder additionalInformation(
+        java.util.Map<String, Object> value) {
+      this.additionalInformation = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingTempTokenParams build() {
+      return new PaymentSourceCreateUsingTempTokenParams(this);
+    }
+  }
+
+  public enum Type {
+    CARD("card"),
+
+    PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+    AMAZON_PAYMENTS("amazon_payments"),
+
+    DIRECT_DEBIT("direct_debit"),
+
+    GENERIC("generic"),
+
+    ALIPAY("alipay"),
+
+    UNIONPAY("unionpay"),
+
+    APPLE_PAY("apple_pay"),
+
+    WECHAT_PAY("wechat_pay"),
+
+    IDEAL("ideal"),
+
+    GOOGLE_PAY("google_pay"),
+
+    SOFORT("sofort"),
+
+    BANCONTACT("bancontact"),
+
+    GIROPAY("giropay"),
+
+    DOTPAY("dotpay"),
+
+    UPI("upi"),
+
+    NETBANKING_EMANDATES("netbanking_emandates"),
+
+    VENMO("venmo"),
+
+    PAY_TO("pay_to"),
+
+    FASTER_PAYMENTS("faster_payments"),
+
+    SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+    AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
+
+    KLARNA_PAY_NOW("klarna_pay_now"),
+
+    ONLINE_BANKING_POLAND("online_banking_poland"),
+
+    PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+    ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+    KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+    PAY_BY_BANK("pay_by_bank"),
+
+    TRUSTLY("trustly"),
+
+    STABLECOIN("stablecoin"),
+
+    /** An enum member indicating that Type was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Type(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Type fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Type enumValue : Type.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateUsingTokenParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateUsingTokenParams.java
new file mode 100644
index 00000000..de6d578a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceCreateUsingTokenParams.java
@@ -0,0 +1,100 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentSource.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentSourceCreateUsingTokenParams {
+
+  private final String customerId;
+
+  private final Boolean replacePrimaryPaymentSource;
+
+  private final String tokenId;
+
+  private PaymentSourceCreateUsingTokenParams(PaymentSourceCreateUsingTokenBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.replacePrimaryPaymentSource = builder.replacePrimaryPaymentSource;
+
+    this.tokenId = builder.tokenId;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public Boolean getReplacePrimaryPaymentSource() {
+    return replacePrimaryPaymentSource;
+  }
+
+  public String getTokenId() {
+    return tokenId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.replacePrimaryPaymentSource != null) {
+
+      formData.put("replace_primary_payment_source", this.replacePrimaryPaymentSource);
+    }
+
+    if (this.tokenId != null) {
+
+      formData.put("token_id", this.tokenId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentSourceCreateUsingTokenParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentSourceCreateUsingTokenBuilder builder() {
+    return new PaymentSourceCreateUsingTokenBuilder();
+  }
+
+  public static final class PaymentSourceCreateUsingTokenBuilder {
+
+    private String customerId;
+
+    private Boolean replacePrimaryPaymentSource;
+
+    private String tokenId;
+
+    private PaymentSourceCreateUsingTokenBuilder() {}
+
+    public PaymentSourceCreateUsingTokenBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingTokenBuilder replacePrimaryPaymentSource(Boolean value) {
+      this.replacePrimaryPaymentSource = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingTokenBuilder tokenId(String value) {
+      this.tokenId = value;
+      return this;
+    }
+
+    public PaymentSourceCreateUsingTokenParams build() {
+      return new PaymentSourceCreateUsingTokenParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceDeleteLocalParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceDeleteLocalParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceDeleteLocalParams.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceDeleteLocalParams.java
index 83addc90..6e44bac3 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceDeleteLocalParams.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceDeleteLocalParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.paymentSource.params;
+package com.chargebee.v4.models.paymentSource.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class PaymentSourceDeleteLocalParams {
 
-  private final Map<String, Object> formData;
-
-  private PaymentSourceDeleteLocalParams(PaymentSourceDeleteLocalBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private PaymentSourceDeleteLocalParams(PaymentSourceDeleteLocalBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static PaymentSourceDeleteLocalBuilder builder() {
   }
 
   public static final class PaymentSourceDeleteLocalBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private PaymentSourceDeleteLocalBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceDeleteParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceDeleteParams.java
index 82825c7a..241d2cd6 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceDeleteParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.paymentSource.params;
+package com.chargebee.v4.models.paymentSource.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class PaymentSourceDeleteParams {
 
-  private final Map<String, Object> formData;
-
-  private PaymentSourceDeleteParams(PaymentSourceDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private PaymentSourceDeleteParams(PaymentSourceDeleteBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static PaymentSourceDeleteBuilder builder() {
   }
 
   public static final class PaymentSourceDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private PaymentSourceDeleteBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceListParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceListParams.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceListParams.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceListParams.java
index 03e14b24..2ee7c263 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceListParams.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentSource.params;
+package com.chargebee.v4.models.paymentSource.params;
 
 import com.chargebee.v4.internal.Recommended;
 
@@ -343,6 +343,16 @@ public enum TypeIs {
 
     PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
 
+    ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+    KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+    PAY_BY_BANK("pay_by_bank"),
+
+    TRUSTLY("trustly"),
+
+    STABLECOIN("stablecoin"),
+
     /** An enum member indicating that TypeIs was instantiated with an unknown value. */
     _UNKNOWN(null);
     private final String value;
@@ -417,6 +427,16 @@ public enum TypeIsNot {
 
     PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
 
+    ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+    KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+    PAY_BY_BANK("pay_by_bank"),
+
+    TRUSTLY("trustly"),
+
+    STABLECOIN("stablecoin"),
+
     /** An enum member indicating that TypeIsNot was instantiated with an unknown value. */
     _UNKNOWN(null);
     private final String value;
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceRetrieveParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceRetrieveParams.java
index c48ca389..fbb9896a 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentSource/params/PaymentSourceRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentSource.params;
+package com.chargebee.v4.models.paymentSource.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceSwitchGatewayAccountParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceSwitchGatewayAccountParams.java
new file mode 100644
index 00000000..62c8f623
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceSwitchGatewayAccountParams.java
@@ -0,0 +1,61 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentSource.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentSourceSwitchGatewayAccountParams {
+
+  private final String gatewayAccountId;
+
+  private PaymentSourceSwitchGatewayAccountParams(
+      PaymentSourceSwitchGatewayAccountBuilder builder) {
+
+    this.gatewayAccountId = builder.gatewayAccountId;
+  }
+
+  public String getGatewayAccountId() {
+    return gatewayAccountId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.gatewayAccountId != null) {
+
+      formData.put("gateway_account_id", this.gatewayAccountId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentSourceSwitchGatewayAccountParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentSourceSwitchGatewayAccountBuilder builder() {
+    return new PaymentSourceSwitchGatewayAccountBuilder();
+  }
+
+  public static final class PaymentSourceSwitchGatewayAccountBuilder {
+
+    private String gatewayAccountId;
+
+    private PaymentSourceSwitchGatewayAccountBuilder() {}
+
+    public PaymentSourceSwitchGatewayAccountBuilder gatewayAccountId(String value) {
+      this.gatewayAccountId = value;
+      return this;
+    }
+
+    public PaymentSourceSwitchGatewayAccountParams build() {
+      return new PaymentSourceSwitchGatewayAccountParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceUpdateBankAccountParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceUpdateBankAccountParams.java
new file mode 100644
index 00000000..060f1313
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceUpdateBankAccountParams.java
@@ -0,0 +1,153 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentSource.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentSourceUpdateBankAccountParams {
+
+  private final BankAccountParams bankAccount;
+
+  private PaymentSourceUpdateBankAccountParams(PaymentSourceUpdateBankAccountBuilder builder) {
+
+    this.bankAccount = builder.bankAccount;
+  }
+
+  public BankAccountParams getBankAccount() {
+    return bankAccount;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.bankAccount != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.bankAccount.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "bank_account[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentSourceUpdateBankAccountParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentSourceUpdateBankAccountBuilder builder() {
+    return new PaymentSourceUpdateBankAccountBuilder();
+  }
+
+  public static final class PaymentSourceUpdateBankAccountBuilder {
+
+    private BankAccountParams bankAccount;
+
+    private PaymentSourceUpdateBankAccountBuilder() {}
+
+    public PaymentSourceUpdateBankAccountBuilder bankAccount(BankAccountParams value) {
+      this.bankAccount = value;
+      return this;
+    }
+
+    public PaymentSourceUpdateBankAccountParams build() {
+      return new PaymentSourceUpdateBankAccountParams(this);
+    }
+  }
+
+  public static final class BankAccountParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private BankAccountParams(BankAccountBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BankAccountParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BankAccountBuilder builder() {
+      return new BankAccountBuilder();
+    }
+
+    public static final class BankAccountBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private BankAccountBuilder() {}
+
+      public BankAccountBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BankAccountBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BankAccountBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BankAccountParams build() {
+        return new BankAccountParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceUpdateCardParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceUpdateCardParams.java
new file mode 100644
index 00000000..f453ea53
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceUpdateCardParams.java
@@ -0,0 +1,374 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentSource.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentSourceUpdateCardParams {
+
+  private final java.util.Map<String, Object> gatewayMetaData;
+
+  private final String referenceTransaction;
+
+  private final CardParams card;
+
+  private PaymentSourceUpdateCardParams(PaymentSourceUpdateCardBuilder builder) {
+
+    this.gatewayMetaData = builder.gatewayMetaData;
+
+    this.referenceTransaction = builder.referenceTransaction;
+
+    this.card = builder.card;
+  }
+
+  public java.util.Map<String, Object> getGatewayMetaData() {
+    return gatewayMetaData;
+  }
+
+  public String getReferenceTransaction() {
+    return referenceTransaction;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.gatewayMetaData != null) {
+
+      formData.put("gateway_meta_data", JsonUtil.toJson(this.gatewayMetaData));
+    }
+
+    if (this.referenceTransaction != null) {
+
+      formData.put("reference_transaction", this.referenceTransaction);
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentSourceUpdateCardParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentSourceUpdateCardBuilder builder() {
+    return new PaymentSourceUpdateCardBuilder();
+  }
+
+  public static final class PaymentSourceUpdateCardBuilder {
+
+    private java.util.Map<String, Object> gatewayMetaData;
+
+    private String referenceTransaction;
+
+    private CardParams card;
+
+    private PaymentSourceUpdateCardBuilder() {}
+
+    public PaymentSourceUpdateCardBuilder gatewayMetaData(java.util.Map<String, Object> value) {
+      this.gatewayMetaData = value;
+      return this;
+    }
+
+    public PaymentSourceUpdateCardBuilder referenceTransaction(String value) {
+      this.referenceTransaction = value;
+      return this;
+    }
+
+    public PaymentSourceUpdateCardBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public PaymentSourceUpdateCardParams build() {
+      return new PaymentSourceUpdateCardParams(this);
+    }
+  }
+
+  public static final class CardParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final Integer expiryMonth;
+
+    private final Integer expiryYear;
+
+    private final String billingAddr1;
+
+    private final String billingAddr2;
+
+    private final String billingCity;
+
+    private final String billingZip;
+
+    private final String billingStateCode;
+
+    private final String billingState;
+
+    private final String billingCountry;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private CardParams(CardBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.expiryMonth = builder.expiryMonth;
+
+      this.expiryYear = builder.expiryYear;
+
+      this.billingAddr1 = builder.billingAddr1;
+
+      this.billingAddr2 = builder.billingAddr2;
+
+      this.billingCity = builder.billingCity;
+
+      this.billingZip = builder.billingZip;
+
+      this.billingStateCode = builder.billingStateCode;
+
+      this.billingState = builder.billingState;
+
+      this.billingCountry = builder.billingCountry;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public Integer getExpiryMonth() {
+      return expiryMonth;
+    }
+
+    public Integer getExpiryYear() {
+      return expiryYear;
+    }
+
+    public String getBillingAddr1() {
+      return billingAddr1;
+    }
+
+    public String getBillingAddr2() {
+      return billingAddr2;
+    }
+
+    public String getBillingCity() {
+      return billingCity;
+    }
+
+    public String getBillingZip() {
+      return billingZip;
+    }
+
+    public String getBillingStateCode() {
+      return billingStateCode;
+    }
+
+    public String getBillingState() {
+      return billingState;
+    }
+
+    public String getBillingCountry() {
+      return billingCountry;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.expiryMonth != null) {
+
+        formData.put("expiry_month", this.expiryMonth);
+      }
+
+      if (this.expiryYear != null) {
+
+        formData.put("expiry_year", this.expiryYear);
+      }
+
+      if (this.billingAddr1 != null) {
+
+        formData.put("billing_addr1", this.billingAddr1);
+      }
+
+      if (this.billingAddr2 != null) {
+
+        formData.put("billing_addr2", this.billingAddr2);
+      }
+
+      if (this.billingCity != null) {
+
+        formData.put("billing_city", this.billingCity);
+      }
+
+      if (this.billingZip != null) {
+
+        formData.put("billing_zip", this.billingZip);
+      }
+
+      if (this.billingStateCode != null) {
+
+        formData.put("billing_state_code", this.billingStateCode);
+      }
+
+      if (this.billingState != null) {
+
+        formData.put("billing_state", this.billingState);
+      }
+
+      if (this.billingCountry != null) {
+
+        formData.put("billing_country", this.billingCountry);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private Integer expiryMonth;
+
+      private Integer expiryYear;
+
+      private String billingAddr1;
+
+      private String billingAddr2;
+
+      private String billingCity;
+
+      private String billingZip;
+
+      private String billingStateCode;
+
+      private String billingState;
+
+      private String billingCountry;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private CardBuilder() {}
+
+      public CardBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CardBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CardBuilder expiryMonth(Integer value) {
+        this.expiryMonth = value;
+        return this;
+      }
+
+      public CardBuilder expiryYear(Integer value) {
+        this.expiryYear = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr1(String value) {
+        this.billingAddr1 = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr2(String value) {
+        this.billingAddr2 = value;
+        return this;
+      }
+
+      public CardBuilder billingCity(String value) {
+        this.billingCity = value;
+        return this;
+      }
+
+      public CardBuilder billingZip(String value) {
+        this.billingZip = value;
+        return this;
+      }
+
+      public CardBuilder billingStateCode(String value) {
+        this.billingStateCode = value;
+        return this;
+      }
+
+      public CardBuilder billingState(String value) {
+        this.billingState = value;
+        return this;
+      }
+
+      public CardBuilder billingCountry(String value) {
+        this.billingCountry = value;
+        return this;
+      }
+
+      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceVerifyBankAccountParams.java b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceVerifyBankAccountParams.java
new file mode 100644
index 00000000..956a93d5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/params/PaymentSourceVerifyBankAccountParams.java
@@ -0,0 +1,80 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentSource.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentSourceVerifyBankAccountParams {
+
+  private final Long amount1;
+
+  private final Long amount2;
+
+  private PaymentSourceVerifyBankAccountParams(PaymentSourceVerifyBankAccountBuilder builder) {
+
+    this.amount1 = builder.amount1;
+
+    this.amount2 = builder.amount2;
+  }
+
+  public Long getAmount1() {
+    return amount1;
+  }
+
+  public Long getAmount2() {
+    return amount2;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.amount1 != null) {
+
+      formData.put("amount1", this.amount1);
+    }
+
+    if (this.amount2 != null) {
+
+      formData.put("amount2", this.amount2);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentSourceVerifyBankAccountParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentSourceVerifyBankAccountBuilder builder() {
+    return new PaymentSourceVerifyBankAccountBuilder();
+  }
+
+  public static final class PaymentSourceVerifyBankAccountBuilder {
+
+    private Long amount1;
+
+    private Long amount2;
+
+    private PaymentSourceVerifyBankAccountBuilder() {}
+
+    public PaymentSourceVerifyBankAccountBuilder amount1(Long value) {
+      this.amount1 = value;
+      return this;
+    }
+
+    public PaymentSourceVerifyBankAccountBuilder amount2(Long value) {
+      this.amount2 = value;
+      return this;
+    }
+
+    public PaymentSourceVerifyBankAccountParams build() {
+      return new PaymentSourceVerifyBankAccountParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/responses/CreateVoucherPaymentSourceResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/CreateVoucherPaymentSourceResponse.java
new file mode 100644
index 00000000..397135d4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/CreateVoucherPaymentSourceResponse.java
@@ -0,0 +1,100 @@
+package com.chargebee.v4.models.paymentSource.responses;
+
+import com.chargebee.v4.models.customer.Customer;
+
+import com.chargebee.v4.models.paymentSource.PaymentSource;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CreateVoucherPaymentSource operation. Contains the response data
+ * from the API.
+ */
+public final class CreateVoucherPaymentSourceResponse extends BaseResponse {
+  private final Customer customer;
+
+  private final PaymentSource paymentSource;
+
+  private CreateVoucherPaymentSourceResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.customer = builder.customer;
+
+    this.paymentSource = builder.paymentSource;
+  }
+
+  /** Parse JSON response into CreateVoucherPaymentSourceResponse object. */
+  public static CreateVoucherPaymentSourceResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CreateVoucherPaymentSourceResponse object with HTTP response. */
+  public static CreateVoucherPaymentSourceResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __customerJson = JsonUtil.getObject(json, "customer");
+      if (__customerJson != null) {
+        builder.customer(Customer.fromJson(__customerJson));
+      }
+
+      String __paymentSourceJson = JsonUtil.getObject(json, "payment_source");
+      if (__paymentSourceJson != null) {
+        builder.paymentSource(PaymentSource.fromJson(__paymentSourceJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CreateVoucherPaymentSourceResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CreateVoucherPaymentSourceResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CreateVoucherPaymentSourceResponse. */
+  public static class Builder {
+
+    private Customer customer;
+
+    private PaymentSource paymentSource;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder customer(Customer customer) {
+      this.customer = customer;
+      return this;
+    }
+
+    public Builder paymentSource(PaymentSource paymentSource) {
+      this.paymentSource = paymentSource;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CreateVoucherPaymentSourceResponse build() {
+      return new CreateVoucherPaymentSourceResponse(this);
+    }
+  }
+
+  /** Get the customer from the response. */
+  public Customer getCustomer() {
+    return customer;
+  }
+
+  /** Get the paymentSource from the response. */
+  public PaymentSource getPaymentSource() {
+    return paymentSource;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/responses/ExportPaymentSourceResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/ExportPaymentSourceResponse.java
new file mode 100644
index 00000000..6cfa323c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/ExportPaymentSourceResponse.java
@@ -0,0 +1,78 @@
+package com.chargebee.v4.models.paymentSource.responses;
+
+import com.chargebee.v4.models.thirdPartyPaymentMethod.ThirdPartyPaymentMethod;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ExportPaymentSource operation. Contains the response data from the
+ * API.
+ */
+public final class ExportPaymentSourceResponse extends BaseResponse {
+  private final ThirdPartyPaymentMethod thirdPartyPaymentMethod;
+
+  private ExportPaymentSourceResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.thirdPartyPaymentMethod = builder.thirdPartyPaymentMethod;
+  }
+
+  /** Parse JSON response into ExportPaymentSourceResponse object. */
+  public static ExportPaymentSourceResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ExportPaymentSourceResponse object with HTTP response. */
+  public static ExportPaymentSourceResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __thirdPartyPaymentMethodJson = JsonUtil.getObject(json, "third_party_payment_method");
+      if (__thirdPartyPaymentMethodJson != null) {
+        builder.thirdPartyPaymentMethod(
+            ThirdPartyPaymentMethod.fromJson(__thirdPartyPaymentMethodJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ExportPaymentSourceResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ExportPaymentSourceResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ExportPaymentSourceResponse. */
+  public static class Builder {
+
+    private ThirdPartyPaymentMethod thirdPartyPaymentMethod;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder thirdPartyPaymentMethod(ThirdPartyPaymentMethod thirdPartyPaymentMethod) {
+      this.thirdPartyPaymentMethod = thirdPartyPaymentMethod;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ExportPaymentSourceResponse build() {
+      return new ExportPaymentSourceResponse(this);
+    }
+  }
+
+  /** Get the thirdPartyPaymentMethod from the response. */
+  public ThirdPartyPaymentMethod getThirdPartyPaymentMethod() {
+    return thirdPartyPaymentMethod;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceAgreementPdfResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceAgreementPdfResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceAgreementPdfResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceAgreementPdfResponse.java
index 0ec47886..d3db8c85 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceAgreementPdfResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceAgreementPdfResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
-import com.chargebee.v4.core.models.download.Download;
+import com.chargebee.v4.models.download.Download;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateBankAccountResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateBankAccountResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateBankAccountResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateBankAccountResponse.java
index 48e8c69a..45dda232 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateBankAccountResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateBankAccountResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateCardResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateCardResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateCardResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateCardResponse.java
index ab16d1cd..6fd53363 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateCardResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateCardResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateUsingPaymentIntentResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateUsingPaymentIntentResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateUsingPaymentIntentResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateUsingPaymentIntentResponse.java
index 3884089d..21964c3c 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateUsingPaymentIntentResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateUsingPaymentIntentResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateUsingPermanentTokenResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateUsingPermanentTokenResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateUsingPermanentTokenResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateUsingPermanentTokenResponse.java
index 2885a6fa..913fbbe4 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateUsingPermanentTokenResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateUsingPermanentTokenResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateUsingTempTokenResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateUsingTempTokenResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateUsingTempTokenResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateUsingTempTokenResponse.java
index d884c784..9f4c97a0 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateUsingTempTokenResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateUsingTempTokenResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateUsingTokenResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateUsingTokenResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateUsingTokenResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateUsingTokenResponse.java
index ab67c8b2..199875bb 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceCreateUsingTokenResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceCreateUsingTokenResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceDeleteLocalResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceDeleteLocalResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceDeleteLocalResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceDeleteLocalResponse.java
index 5fb141a8..fcc5e921 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceDeleteLocalResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceDeleteLocalResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceDeleteResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceDeleteResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceDeleteResponse.java
index 3642dda1..57007979 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceDeleteResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceListResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceListResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceListResponse.java
index 4b7676cd..0cd02cd0 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.PaymentSourceService;
-import com.chargebee.v4.core.models.paymentSource.params.PaymentSourceListParams;
+import com.chargebee.v4.services.PaymentSourceService;
+import com.chargebee.v4.models.paymentSource.params.PaymentSourceListParams;
 
 /** Immutable response object for PaymentSourceList operation. Contains paginated list data. */
 public final class PaymentSourceListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public PaymentSourceListResponse nextPage() throws Exception {
+  public PaymentSourceListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceRetrieveResponse.java
new file mode 100644
index 00000000..6062e205
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.paymentSource.responses;
+
+import com.chargebee.v4.models.paymentSource.PaymentSource;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for PaymentSourceRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class PaymentSourceRetrieveResponse extends BaseResponse {
+  private final PaymentSource paymentSource;
+
+  private PaymentSourceRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.paymentSource = builder.paymentSource;
+  }
+
+  /** Parse JSON response into PaymentSourceRetrieveResponse object. */
+  public static PaymentSourceRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into PaymentSourceRetrieveResponse object with HTTP response. */
+  public static PaymentSourceRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __paymentSourceJson = JsonUtil.getObject(json, "payment_source");
+      if (__paymentSourceJson != null) {
+        builder.paymentSource(PaymentSource.fromJson(__paymentSourceJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse PaymentSourceRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for PaymentSourceRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for PaymentSourceRetrieveResponse. */
+  public static class Builder {
+
+    private PaymentSource paymentSource;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder paymentSource(PaymentSource paymentSource) {
+      this.paymentSource = paymentSource;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public PaymentSourceRetrieveResponse build() {
+      return new PaymentSourceRetrieveResponse(this);
+    }
+  }
+
+  /** Get the paymentSource from the response. */
+  public PaymentSource getPaymentSource() {
+    return paymentSource;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceSwitchGatewayAccountResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceSwitchGatewayAccountResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceSwitchGatewayAccountResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceSwitchGatewayAccountResponse.java
index 85a3a0ad..33d6c8eb 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceSwitchGatewayAccountResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceSwitchGatewayAccountResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceUpdateBankAccountResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceUpdateBankAccountResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceUpdateBankAccountResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceUpdateBankAccountResponse.java
index 01059b9d..84a9d400 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceUpdateBankAccountResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceUpdateBankAccountResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceUpdateCardResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceUpdateCardResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceUpdateCardResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceUpdateCardResponse.java
index 7ab659fa..1ad9fdd9 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceUpdateCardResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceUpdateCardResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceVerifyBankAccountResponse.java b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceVerifyBankAccountResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceVerifyBankAccountResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceVerifyBankAccountResponse.java
index 827bb5ae..f2257402 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentSource/PaymentSourceVerifyBankAccountResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceVerifyBankAccountResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.paymentSource;
+package com.chargebee.v4.models.paymentSource.responses;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentVoucher/PaymentVoucher.java b/src/main/java/com/chargebee/v4/models/paymentVoucher/PaymentVoucher.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/paymentVoucher/PaymentVoucher.java
rename to src/main/java/com/chargebee/v4/models/paymentVoucher/PaymentVoucher.java
index 5f9124ac..2aa2eef7 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentVoucher/PaymentVoucher.java
+++ b/src/main/java/com/chargebee/v4/models/paymentVoucher/PaymentVoucher.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentVoucher;
+package com.chargebee.v4.models.paymentVoucher;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -283,6 +283,8 @@ public enum Gateway {
 
     DEUTSCHE_BANK("deutsche_bank"),
 
+    EZIDEBIT("ezidebit"),
+
     NOT_APPLICABLE("not_applicable"),
 
     /** An enum member indicating that Gateway was instantiated with an unknown value. */
diff --git a/src/main/java/com/chargebee/v4/models/paymentVoucher/params/PaymentVoucherCreateParams.java b/src/main/java/com/chargebee/v4/models/paymentVoucher/params/PaymentVoucherCreateParams.java
new file mode 100644
index 00000000..cbeeb984
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentVoucher/params/PaymentVoucherCreateParams.java
@@ -0,0 +1,258 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.paymentVoucher.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class PaymentVoucherCreateParams {
+
+  private final String customerId;
+
+  private final String paymentSourceId;
+
+  private final VoucherPaymentSourceParams voucherPaymentSource;
+
+  private final List<InvoiceAllocationsParams> invoiceAllocations;
+
+  private PaymentVoucherCreateParams(PaymentVoucherCreateBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.voucherPaymentSource = builder.voucherPaymentSource;
+
+    this.invoiceAllocations = builder.invoiceAllocations;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public VoucherPaymentSourceParams getVoucherPaymentSource() {
+    return voucherPaymentSource;
+  }
+
+  public List<InvoiceAllocationsParams> getInvoiceAllocations() {
+    return invoiceAllocations;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.voucherPaymentSource != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.voucherPaymentSource.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "voucher_payment_source[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.invoiceAllocations != null) {
+
+      // List of objects
+      for (int i = 0; i < this.invoiceAllocations.size(); i++) {
+        InvoiceAllocationsParams item = this.invoiceAllocations.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "invoice_allocations[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PaymentVoucherCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentVoucherCreateBuilder builder() {
+    return new PaymentVoucherCreateBuilder();
+  }
+
+  public static final class PaymentVoucherCreateBuilder {
+
+    private String customerId;
+
+    private String paymentSourceId;
+
+    private VoucherPaymentSourceParams voucherPaymentSource;
+
+    private List<InvoiceAllocationsParams> invoiceAllocations;
+
+    private PaymentVoucherCreateBuilder() {}
+
+    public PaymentVoucherCreateBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PaymentVoucherCreateBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public PaymentVoucherCreateBuilder voucherPaymentSource(VoucherPaymentSourceParams value) {
+      this.voucherPaymentSource = value;
+      return this;
+    }
+
+    public PaymentVoucherCreateBuilder invoiceAllocations(List<InvoiceAllocationsParams> value) {
+      this.invoiceAllocations = value;
+      return this;
+    }
+
+    public PaymentVoucherCreateParams build() {
+      return new PaymentVoucherCreateParams(this);
+    }
+  }
+
+  public static final class VoucherPaymentSourceParams {
+
+    private final VoucherType voucherType;
+
+    private VoucherPaymentSourceParams(VoucherPaymentSourceBuilder builder) {
+
+      this.voucherType = builder.voucherType;
+    }
+
+    public VoucherType getVoucherType() {
+      return voucherType;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.voucherType != null) {
+
+        formData.put("voucher_type", this.voucherType);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for VoucherPaymentSourceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static VoucherPaymentSourceBuilder builder() {
+      return new VoucherPaymentSourceBuilder();
+    }
+
+    public static final class VoucherPaymentSourceBuilder {
+
+      private VoucherType voucherType;
+
+      private VoucherPaymentSourceBuilder() {}
+
+      public VoucherPaymentSourceBuilder voucherType(VoucherType value) {
+        this.voucherType = value;
+        return this;
+      }
+
+      public VoucherPaymentSourceParams build() {
+        return new VoucherPaymentSourceParams(this);
+      }
+    }
+
+    public enum VoucherType {
+      BOLETO("boleto"),
+
+      /** An enum member indicating that VoucherType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      VoucherType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static VoucherType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (VoucherType enumValue : VoucherType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class InvoiceAllocationsParams {
+
+    private final String invoiceId;
+
+    private InvoiceAllocationsParams(InvoiceAllocationsBuilder builder) {
+
+      this.invoiceId = builder.invoiceId;
+    }
+
+    public String getInvoiceId() {
+      return invoiceId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.invoiceId != null) {
+
+        formData.put("invoice_id", this.invoiceId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceAllocationsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceAllocationsBuilder builder() {
+      return new InvoiceAllocationsBuilder();
+    }
+
+    public static final class InvoiceAllocationsBuilder {
+
+      private String invoiceId;
+
+      private InvoiceAllocationsBuilder() {}
+
+      public InvoiceAllocationsBuilder invoiceId(String value) {
+        this.invoiceId = value;
+        return this;
+      }
+
+      public InvoiceAllocationsParams build() {
+        return new InvoiceAllocationsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/paymentVoucher/params/PaymentVoucherRetrieveParams.java b/src/main/java/com/chargebee/v4/models/paymentVoucher/params/PaymentVoucherRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/paymentVoucher/params/PaymentVoucherRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/paymentVoucher/params/PaymentVoucherRetrieveParams.java
index bf186a53..cbd78a47 100644
--- a/src/main/java/com/chargebee/v4/core/models/paymentVoucher/params/PaymentVoucherRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/paymentVoucher/params/PaymentVoucherRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.paymentVoucher.params;
+package com.chargebee.v4.models.paymentVoucher.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/paymentVoucher/params/PaymentVouchersForCustomerParams.java b/src/main/java/com/chargebee/v4/models/paymentVoucher/params/PaymentVouchersForCustomerParams.java
new file mode 100644
index 00000000..28f7d4ba
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentVoucher/params/PaymentVouchersForCustomerParams.java
@@ -0,0 +1,259 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.paymentVoucher.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentVouchersForCustomerParams {
+
+  private final Map<String, Object> queryParams;
+
+  private PaymentVouchersForCustomerParams(PaymentVouchersForCustomerBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public PaymentVouchersForCustomerBuilder toBuilder() {
+    PaymentVouchersForCustomerBuilder builder = new PaymentVouchersForCustomerBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for PaymentVouchersForCustomerParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentVouchersForCustomerBuilder builder() {
+    return new PaymentVouchersForCustomerBuilder();
+  }
+
+  public static final class PaymentVouchersForCustomerBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private PaymentVouchersForCustomerBuilder() {}
+
+    public PaymentVouchersForCustomerBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public PaymentVouchersForCustomerBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public StatusFilter status() {
+      return new StatusFilter("status", this);
+    }
+
+    public SortBySortBuilder sortBy() {
+      return new SortBySortBuilder("sort_by", this);
+    }
+
+    public PaymentVouchersForCustomerParams build() {
+      return new PaymentVouchersForCustomerParams(this);
+    }
+
+    public static final class StatusFilter {
+      private final String fieldName;
+      private final PaymentVouchersForCustomerBuilder builder;
+
+      StatusFilter(String fieldName, PaymentVouchersForCustomerBuilder builder) {
+        this.fieldName = fieldName;
+        this.builder = builder;
+      }
+
+      public PaymentVouchersForCustomerBuilder is(String value) {
+        builder.queryParams.put(fieldName + "[is]", value);
+        return builder;
+      }
+
+      public PaymentVouchersForCustomerBuilder isNot(String value) {
+        builder.queryParams.put(fieldName + "[is_not]", value);
+        return builder;
+      }
+
+      public PaymentVouchersForCustomerBuilder in(String... values) {
+        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
+        return builder;
+      }
+
+      public PaymentVouchersForCustomerBuilder notIn(String... values) {
+        builder.queryParams.put(fieldName + "[not_in]", "[" + String.join(",", values) + "]");
+        return builder;
+      }
+    }
+
+    public static final class SortBySortBuilder {
+      private final String fieldName;
+      private final PaymentVouchersForCustomerBuilder builder;
+
+      SortBySortBuilder(String fieldName, PaymentVouchersForCustomerBuilder builder) {
+        this.fieldName = fieldName;
+        this.builder = builder;
+      }
+
+      public SortDirection date() {
+        return new SortDirection(fieldName, "date", builder);
+      }
+
+      public SortDirection updated_at() {
+        return new SortDirection(fieldName, "updated_at", builder);
+      }
+    }
+
+    public static final class SortDirection {
+      private final String fieldName;
+      private final String selectedField;
+      private final PaymentVouchersForCustomerBuilder builder;
+
+      SortDirection(
+          String fieldName, String selectedField, PaymentVouchersForCustomerBuilder builder) {
+        this.fieldName = fieldName;
+        this.selectedField = selectedField;
+        this.builder = builder;
+      }
+
+      public PaymentVouchersForCustomerBuilder asc() {
+        builder.queryParams.put(fieldName + "[asc]", selectedField);
+        return builder;
+      }
+
+      public PaymentVouchersForCustomerBuilder desc() {
+        builder.queryParams.put(fieldName + "[desc]", selectedField);
+        return builder;
+      }
+    }
+  }
+
+  public enum StatusIs {
+    ACTIVE("active"),
+
+    CONSUMED("consumed"),
+
+    EXPIRED("expired"),
+
+    FAILURE("failure"),
+
+    /** An enum member indicating that StatusIs was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    StatusIs(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static StatusIs fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (StatusIs enumValue : StatusIs.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum StatusIsNot {
+    ACTIVE("active"),
+
+    CONSUMED("consumed"),
+
+    EXPIRED("expired"),
+
+    FAILURE("failure"),
+
+    /** An enum member indicating that StatusIsNot was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    StatusIsNot(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static StatusIsNot fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (StatusIsNot enumValue : StatusIsNot.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum SortByAsc {
+    DATE("date"),
+
+    UPDATED_AT("updated_at"),
+
+    /** An enum member indicating that SortByAsc was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    SortByAsc(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static SortByAsc fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (SortByAsc enumValue : SortByAsc.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum SortByDesc {
+    DATE("date"),
+
+    UPDATED_AT("updated_at"),
+
+    /** An enum member indicating that SortByDesc was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    SortByDesc(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static SortByDesc fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (SortByDesc enumValue : SortByDesc.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentVoucher/params/PaymentVouchersForInvoiceParams.java b/src/main/java/com/chargebee/v4/models/paymentVoucher/params/PaymentVouchersForInvoiceParams.java
new file mode 100644
index 00000000..d1c9b112
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentVoucher/params/PaymentVouchersForInvoiceParams.java
@@ -0,0 +1,259 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.paymentVoucher.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PaymentVouchersForInvoiceParams {
+
+  private final Map<String, Object> queryParams;
+
+  private PaymentVouchersForInvoiceParams(PaymentVouchersForInvoiceBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public PaymentVouchersForInvoiceBuilder toBuilder() {
+    PaymentVouchersForInvoiceBuilder builder = new PaymentVouchersForInvoiceBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for PaymentVouchersForInvoiceParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PaymentVouchersForInvoiceBuilder builder() {
+    return new PaymentVouchersForInvoiceBuilder();
+  }
+
+  public static final class PaymentVouchersForInvoiceBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private PaymentVouchersForInvoiceBuilder() {}
+
+    public PaymentVouchersForInvoiceBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public PaymentVouchersForInvoiceBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public StatusFilter status() {
+      return new StatusFilter("status", this);
+    }
+
+    public SortBySortBuilder sortBy() {
+      return new SortBySortBuilder("sort_by", this);
+    }
+
+    public PaymentVouchersForInvoiceParams build() {
+      return new PaymentVouchersForInvoiceParams(this);
+    }
+
+    public static final class StatusFilter {
+      private final String fieldName;
+      private final PaymentVouchersForInvoiceBuilder builder;
+
+      StatusFilter(String fieldName, PaymentVouchersForInvoiceBuilder builder) {
+        this.fieldName = fieldName;
+        this.builder = builder;
+      }
+
+      public PaymentVouchersForInvoiceBuilder is(String value) {
+        builder.queryParams.put(fieldName + "[is]", value);
+        return builder;
+      }
+
+      public PaymentVouchersForInvoiceBuilder isNot(String value) {
+        builder.queryParams.put(fieldName + "[is_not]", value);
+        return builder;
+      }
+
+      public PaymentVouchersForInvoiceBuilder in(String... values) {
+        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
+        return builder;
+      }
+
+      public PaymentVouchersForInvoiceBuilder notIn(String... values) {
+        builder.queryParams.put(fieldName + "[not_in]", "[" + String.join(",", values) + "]");
+        return builder;
+      }
+    }
+
+    public static final class SortBySortBuilder {
+      private final String fieldName;
+      private final PaymentVouchersForInvoiceBuilder builder;
+
+      SortBySortBuilder(String fieldName, PaymentVouchersForInvoiceBuilder builder) {
+        this.fieldName = fieldName;
+        this.builder = builder;
+      }
+
+      public SortDirection date() {
+        return new SortDirection(fieldName, "date", builder);
+      }
+
+      public SortDirection updated_at() {
+        return new SortDirection(fieldName, "updated_at", builder);
+      }
+    }
+
+    public static final class SortDirection {
+      private final String fieldName;
+      private final String selectedField;
+      private final PaymentVouchersForInvoiceBuilder builder;
+
+      SortDirection(
+          String fieldName, String selectedField, PaymentVouchersForInvoiceBuilder builder) {
+        this.fieldName = fieldName;
+        this.selectedField = selectedField;
+        this.builder = builder;
+      }
+
+      public PaymentVouchersForInvoiceBuilder asc() {
+        builder.queryParams.put(fieldName + "[asc]", selectedField);
+        return builder;
+      }
+
+      public PaymentVouchersForInvoiceBuilder desc() {
+        builder.queryParams.put(fieldName + "[desc]", selectedField);
+        return builder;
+      }
+    }
+  }
+
+  public enum StatusIs {
+    ACTIVE("active"),
+
+    CONSUMED("consumed"),
+
+    EXPIRED("expired"),
+
+    FAILURE("failure"),
+
+    /** An enum member indicating that StatusIs was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    StatusIs(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static StatusIs fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (StatusIs enumValue : StatusIs.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum StatusIsNot {
+    ACTIVE("active"),
+
+    CONSUMED("consumed"),
+
+    EXPIRED("expired"),
+
+    FAILURE("failure"),
+
+    /** An enum member indicating that StatusIsNot was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    StatusIsNot(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static StatusIsNot fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (StatusIsNot enumValue : StatusIsNot.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum SortByAsc {
+    DATE("date"),
+
+    UPDATED_AT("updated_at"),
+
+    /** An enum member indicating that SortByAsc was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    SortByAsc(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static SortByAsc fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (SortByAsc enumValue : SortByAsc.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum SortByDesc {
+    DATE("date"),
+
+    UPDATED_AT("updated_at"),
+
+    /** An enum member indicating that SortByDesc was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    SortByDesc(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static SortByDesc fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (SortByDesc enumValue : SortByDesc.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/paymentVoucher/PaymentVoucherCreateResponse.java b/src/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVoucherCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/paymentVoucher/PaymentVoucherCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVoucherCreateResponse.java
index 916fd4fc..3347c63d 100644
--- a/src/main/java/com/chargebee/v4/core/responses/paymentVoucher/PaymentVoucherCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVoucherCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.paymentVoucher;
+package com.chargebee.v4.models.paymentVoucher.responses;
 
-import com.chargebee.v4.core.models.paymentVoucher.PaymentVoucher;
+import com.chargebee.v4.models.paymentVoucher.PaymentVoucher;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVoucherRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVoucherRetrieveResponse.java
new file mode 100644
index 00000000..1884f7fa
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVoucherRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.paymentVoucher.responses;
+
+import com.chargebee.v4.models.paymentVoucher.PaymentVoucher;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for PaymentVoucherRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class PaymentVoucherRetrieveResponse extends BaseResponse {
+  private final PaymentVoucher paymentVoucher;
+
+  private PaymentVoucherRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.paymentVoucher = builder.paymentVoucher;
+  }
+
+  /** Parse JSON response into PaymentVoucherRetrieveResponse object. */
+  public static PaymentVoucherRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into PaymentVoucherRetrieveResponse object with HTTP response. */
+  public static PaymentVoucherRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __paymentVoucherJson = JsonUtil.getObject(json, "payment_voucher");
+      if (__paymentVoucherJson != null) {
+        builder.paymentVoucher(PaymentVoucher.fromJson(__paymentVoucherJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse PaymentVoucherRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for PaymentVoucherRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for PaymentVoucherRetrieveResponse. */
+  public static class Builder {
+
+    private PaymentVoucher paymentVoucher;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder paymentVoucher(PaymentVoucher paymentVoucher) {
+      this.paymentVoucher = paymentVoucher;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public PaymentVoucherRetrieveResponse build() {
+      return new PaymentVoucherRetrieveResponse(this);
+    }
+  }
+
+  /** Get the paymentVoucher from the response. */
+  public PaymentVoucher getPaymentVoucher() {
+    return paymentVoucher;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVouchersForCustomerResponse.java b/src/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVouchersForCustomerResponse.java
new file mode 100644
index 00000000..90ee6b91
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVouchersForCustomerResponse.java
@@ -0,0 +1,177 @@
+package com.chargebee.v4.models.paymentVoucher.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.paymentVoucher.PaymentVoucher;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.PaymentVoucherService;
+import com.chargebee.v4.models.paymentVoucher.params.PaymentVouchersForCustomerParams;
+
+/**
+ * Immutable response object for PaymentVouchersForCustomer operation. Contains paginated list data.
+ */
+public final class PaymentVouchersForCustomerResponse {
+
+  private final List<PaymentVoucherPaymentVouchersForCustomerItem> list;
+
+  private final String nextOffset;
+
+  private final String customerId;
+
+  private final PaymentVoucherService service;
+  private final PaymentVouchersForCustomerParams originalParams;
+  private final Response httpResponse;
+
+  private PaymentVouchersForCustomerResponse(
+      List<PaymentVoucherPaymentVouchersForCustomerItem> list,
+      String nextOffset,
+      String customerId,
+      PaymentVoucherService service,
+      PaymentVouchersForCustomerParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.customerId = customerId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into PaymentVouchersForCustomerResponse object (no service context). Use
+   * this when you only need to read a single page (no nextPage()).
+   */
+  public static PaymentVouchersForCustomerResponse fromJson(String json) {
+    try {
+
+      List<PaymentVoucherPaymentVouchersForCustomerItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(PaymentVoucherPaymentVouchersForCustomerItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new PaymentVouchersForCustomerResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse PaymentVouchersForCustomerResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into PaymentVouchersForCustomerResponse object with service context for
+   * pagination (enables nextPage()).
+   */
+  public static PaymentVouchersForCustomerResponse fromJson(
+      String json,
+      PaymentVoucherService service,
+      PaymentVouchersForCustomerParams originalParams,
+      String customerId,
+      Response httpResponse) {
+    try {
+
+      List<PaymentVoucherPaymentVouchersForCustomerItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(PaymentVoucherPaymentVouchersForCustomerItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new PaymentVouchersForCustomerResponse(
+          list, nextOffset, customerId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse PaymentVouchersForCustomerResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<PaymentVoucherPaymentVouchersForCustomerItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public PaymentVouchersForCustomerResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    PaymentVouchersForCustomerParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : PaymentVouchersForCustomerParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.paymentVouchersForCustomer(customerId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class PaymentVoucherPaymentVouchersForCustomerItem {
+
+    private PaymentVoucher paymentVoucher;
+
+    public PaymentVoucher getPaymentVoucher() {
+      return paymentVoucher;
+    }
+
+    public static PaymentVoucherPaymentVouchersForCustomerItem fromJson(String json) {
+      PaymentVoucherPaymentVouchersForCustomerItem item =
+          new PaymentVoucherPaymentVouchersForCustomerItem();
+
+      String __paymentVoucherJson = JsonUtil.getObject(json, "payment_voucher");
+      if (__paymentVoucherJson != null) {
+        item.paymentVoucher = PaymentVoucher.fromJson(__paymentVoucherJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVouchersForInvoiceResponse.java b/src/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVouchersForInvoiceResponse.java
new file mode 100644
index 00000000..09554754
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVouchersForInvoiceResponse.java
@@ -0,0 +1,177 @@
+package com.chargebee.v4.models.paymentVoucher.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.paymentVoucher.PaymentVoucher;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.PaymentVoucherService;
+import com.chargebee.v4.models.paymentVoucher.params.PaymentVouchersForInvoiceParams;
+
+/**
+ * Immutable response object for PaymentVouchersForInvoice operation. Contains paginated list data.
+ */
+public final class PaymentVouchersForInvoiceResponse {
+
+  private final List<PaymentVoucherPaymentVouchersForInvoiceItem> list;
+
+  private final String nextOffset;
+
+  private final String invoiceId;
+
+  private final PaymentVoucherService service;
+  private final PaymentVouchersForInvoiceParams originalParams;
+  private final Response httpResponse;
+
+  private PaymentVouchersForInvoiceResponse(
+      List<PaymentVoucherPaymentVouchersForInvoiceItem> list,
+      String nextOffset,
+      String invoiceId,
+      PaymentVoucherService service,
+      PaymentVouchersForInvoiceParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.invoiceId = invoiceId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into PaymentVouchersForInvoiceResponse object (no service context). Use
+   * this when you only need to read a single page (no nextPage()).
+   */
+  public static PaymentVouchersForInvoiceResponse fromJson(String json) {
+    try {
+
+      List<PaymentVoucherPaymentVouchersForInvoiceItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(PaymentVoucherPaymentVouchersForInvoiceItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new PaymentVouchersForInvoiceResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse PaymentVouchersForInvoiceResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into PaymentVouchersForInvoiceResponse object with service context for
+   * pagination (enables nextPage()).
+   */
+  public static PaymentVouchersForInvoiceResponse fromJson(
+      String json,
+      PaymentVoucherService service,
+      PaymentVouchersForInvoiceParams originalParams,
+      String invoiceId,
+      Response httpResponse) {
+    try {
+
+      List<PaymentVoucherPaymentVouchersForInvoiceItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(PaymentVoucherPaymentVouchersForInvoiceItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new PaymentVouchersForInvoiceResponse(
+          list, nextOffset, invoiceId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse PaymentVouchersForInvoiceResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<PaymentVoucherPaymentVouchersForInvoiceItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public PaymentVouchersForInvoiceResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    PaymentVouchersForInvoiceParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : PaymentVouchersForInvoiceParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.paymentVouchersForInvoice(invoiceId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class PaymentVoucherPaymentVouchersForInvoiceItem {
+
+    private PaymentVoucher paymentVoucher;
+
+    public PaymentVoucher getPaymentVoucher() {
+      return paymentVoucher;
+    }
+
+    public static PaymentVoucherPaymentVouchersForInvoiceItem fromJson(String json) {
+      PaymentVoucherPaymentVouchersForInvoiceItem item =
+          new PaymentVoucherPaymentVouchersForInvoiceItem();
+
+      String __paymentVoucherJson = JsonUtil.getObject(json, "payment_voucher");
+      if (__paymentVoucherJson != null) {
+        item.paymentVoucher = PaymentVoucher.fromJson(__paymentVoucherJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2Migration/params/Pc2MigrationContactSupportParams.java b/src/main/java/com/chargebee/v4/models/pc2Migration/params/Pc2MigrationContactSupportParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/pc2Migration/params/Pc2MigrationContactSupportParams.java
rename to src/main/java/com/chargebee/v4/models/pc2Migration/params/Pc2MigrationContactSupportParams.java
index e052a65d..665e6e94 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2Migration/params/Pc2MigrationContactSupportParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2Migration/params/Pc2MigrationContactSupportParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.pc2Migration.params;
+package com.chargebee.v4.models.pc2Migration.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class Pc2MigrationContactSupportParams {
 
-  private final Map<String, Object> formData;
-
-  private Pc2MigrationContactSupportParams(Pc2MigrationContactSupportBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private Pc2MigrationContactSupportParams(Pc2MigrationContactSupportBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static Pc2MigrationContactSupportBuilder builder() {
   }
 
   public static final class Pc2MigrationContactSupportBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private Pc2MigrationContactSupportBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2Migration/params/Pc2MigrationCreateParams.java b/src/main/java/com/chargebee/v4/models/pc2Migration/params/Pc2MigrationCreateParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/pc2Migration/params/Pc2MigrationCreateParams.java
rename to src/main/java/com/chargebee/v4/models/pc2Migration/params/Pc2MigrationCreateParams.java
index bca01256..1f45a9b1 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2Migration/params/Pc2MigrationCreateParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2Migration/params/Pc2MigrationCreateParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.pc2Migration.params;
+package com.chargebee.v4.models.pc2Migration.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class Pc2MigrationCreateParams {
 
-  private final Map<String, Object> formData;
-
-  private Pc2MigrationCreateParams(Pc2MigrationCreateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private Pc2MigrationCreateParams(Pc2MigrationCreateBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static Pc2MigrationCreateBuilder builder() {
   }
 
   public static final class Pc2MigrationCreateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private Pc2MigrationCreateBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2Migration/params/Pc2MigrationInitiateParams.java b/src/main/java/com/chargebee/v4/models/pc2Migration/params/Pc2MigrationInitiateParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/pc2Migration/params/Pc2MigrationInitiateParams.java
rename to src/main/java/com/chargebee/v4/models/pc2Migration/params/Pc2MigrationInitiateParams.java
index b102c30d..dcd2ca04 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2Migration/params/Pc2MigrationInitiateParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2Migration/params/Pc2MigrationInitiateParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.pc2Migration.params;
+package com.chargebee.v4.models.pc2Migration.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class Pc2MigrationInitiateParams {
 
-  private final Map<String, Object> formData;
-
-  private Pc2MigrationInitiateParams(Pc2MigrationInitiateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private Pc2MigrationInitiateParams(Pc2MigrationInitiateBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static Pc2MigrationInitiateBuilder builder() {
   }
 
   public static final class Pc2MigrationInitiateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private Pc2MigrationInitiateBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2Migration/params/Pc2MigrationRetrieveParams.java b/src/main/java/com/chargebee/v4/models/pc2Migration/params/Pc2MigrationRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/pc2Migration/params/Pc2MigrationRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/pc2Migration/params/Pc2MigrationRetrieveParams.java
index fa923cd0..351722b6 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2Migration/params/Pc2MigrationRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2Migration/params/Pc2MigrationRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.pc2Migration.params;
+package com.chargebee.v4.models.pc2Migration.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2Migration/Pc2MigrationContactSupportResponse.java b/src/main/java/com/chargebee/v4/models/pc2Migration/responses/Pc2MigrationContactSupportResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/pc2Migration/Pc2MigrationContactSupportResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2Migration/responses/Pc2MigrationContactSupportResponse.java
index 3b28aff0..5ee55101 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2Migration/Pc2MigrationContactSupportResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2Migration/responses/Pc2MigrationContactSupportResponse.java
@@ -1,6 +1,6 @@
-package com.chargebee.v4.core.responses.pc2Migration;
+package com.chargebee.v4.models.pc2Migration.responses;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.transport.Response;
 
 /**
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2Migration/Pc2MigrationCreateResponse.java b/src/main/java/com/chargebee/v4/models/pc2Migration/responses/Pc2MigrationCreateResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/pc2Migration/Pc2MigrationCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2Migration/responses/Pc2MigrationCreateResponse.java
index fb1f36eb..dcaeeda3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2Migration/Pc2MigrationCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2Migration/responses/Pc2MigrationCreateResponse.java
@@ -1,6 +1,6 @@
-package com.chargebee.v4.core.responses.pc2Migration;
+package com.chargebee.v4.models.pc2Migration.responses;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.transport.Response;
 
 /**
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2Migration/Pc2MigrationInitiateResponse.java b/src/main/java/com/chargebee/v4/models/pc2Migration/responses/Pc2MigrationInitiateResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/pc2Migration/Pc2MigrationInitiateResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2Migration/responses/Pc2MigrationInitiateResponse.java
index 0a49ca3e..af777160 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2Migration/Pc2MigrationInitiateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2Migration/responses/Pc2MigrationInitiateResponse.java
@@ -1,6 +1,6 @@
-package com.chargebee.v4.core.responses.pc2Migration;
+package com.chargebee.v4.models.pc2Migration.responses;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.transport.Response;
 
 /**
diff --git a/src/main/java/com/chargebee/v4/models/pc2Migration/responses/Pc2MigrationRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/pc2Migration/responses/Pc2MigrationRetrieveResponse.java
new file mode 100644
index 00000000..214d0338
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/pc2Migration/responses/Pc2MigrationRetrieveResponse.java
@@ -0,0 +1,72 @@
+package com.chargebee.v4.models.pc2Migration.responses;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for Pc2MigrationRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class Pc2MigrationRetrieveResponse extends BaseResponse {
+  private final Object pc2Migration;
+
+  private Pc2MigrationRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.pc2Migration = builder.pc2Migration;
+  }
+
+  /** Parse JSON response into Pc2MigrationRetrieveResponse object. */
+  public static Pc2MigrationRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into Pc2MigrationRetrieveResponse object with HTTP response. */
+  public static Pc2MigrationRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.pc2Migration(JsonUtil.getObject(json, "pc2_migration"));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse Pc2MigrationRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for Pc2MigrationRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for Pc2MigrationRetrieveResponse. */
+  public static class Builder {
+
+    private Object pc2Migration;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder pc2Migration(Object pc2Migration) {
+      this.pc2Migration = pc2Migration;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public Pc2MigrationRetrieveResponse build() {
+      return new Pc2MigrationRetrieveResponse(this);
+    }
+  }
+
+  /** Get the pc2Migration from the response. */
+  public Object getPc2Migration() {
+    return pc2Migration;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemCreateParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemCreateParams.java
new file mode 100644
index 00000000..96d38464
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemCreateParams.java
@@ -0,0 +1,548 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.pc2MigrationItem.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class Pc2MigrationItemCreateParams {
+
+  private final String id;
+
+  private final String name;
+
+  private final Pc1Type pc1Type;
+
+  private final String pc2MigrationItemFamilyId;
+
+  private final String pc2MigrationId;
+
+  private final String description;
+
+  private final String metadata;
+
+  private final Boolean isGiftable;
+
+  private final Boolean isShippable;
+
+  private final Boolean enabledForCheckout;
+
+  private final Boolean enabledInPortal;
+
+  private final String redirectUrl;
+
+  private final Boolean isRecurring;
+
+  private final String giftClaimRedirectUrl;
+
+  private final Boolean includedInMrr;
+
+  private final String unit;
+
+  private final List<Pc2MigrationItemPricesParams> pc2MigrationItemPrices;
+
+  private Pc2MigrationItemCreateParams(Pc2MigrationItemCreateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.name = builder.name;
+
+    this.pc1Type = builder.pc1Type;
+
+    this.pc2MigrationItemFamilyId = builder.pc2MigrationItemFamilyId;
+
+    this.pc2MigrationId = builder.pc2MigrationId;
+
+    this.description = builder.description;
+
+    this.metadata = builder.metadata;
+
+    this.isGiftable = builder.isGiftable;
+
+    this.isShippable = builder.isShippable;
+
+    this.enabledForCheckout = builder.enabledForCheckout;
+
+    this.enabledInPortal = builder.enabledInPortal;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.isRecurring = builder.isRecurring;
+
+    this.giftClaimRedirectUrl = builder.giftClaimRedirectUrl;
+
+    this.includedInMrr = builder.includedInMrr;
+
+    this.unit = builder.unit;
+
+    this.pc2MigrationItemPrices = builder.pc2MigrationItemPrices;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public Pc1Type getPc1Type() {
+    return pc1Type;
+  }
+
+  public String getPc2MigrationItemFamilyId() {
+    return pc2MigrationItemFamilyId;
+  }
+
+  public String getPc2MigrationId() {
+    return pc2MigrationId;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public String getMetadata() {
+    return metadata;
+  }
+
+  public Boolean getIsGiftable() {
+    return isGiftable;
+  }
+
+  public Boolean getIsShippable() {
+    return isShippable;
+  }
+
+  public Boolean getEnabledForCheckout() {
+    return enabledForCheckout;
+  }
+
+  public Boolean getEnabledInPortal() {
+    return enabledInPortal;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public Boolean getIsRecurring() {
+    return isRecurring;
+  }
+
+  public String getGiftClaimRedirectUrl() {
+    return giftClaimRedirectUrl;
+  }
+
+  public Boolean getIncludedInMrr() {
+    return includedInMrr;
+  }
+
+  public String getUnit() {
+    return unit;
+  }
+
+  public List<Pc2MigrationItemPricesParams> getPc2MigrationItemPrices() {
+    return pc2MigrationItemPrices;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.pc1Type != null) {
+
+      formData.put("pc1_type", this.pc1Type);
+    }
+
+    if (this.pc2MigrationItemFamilyId != null) {
+
+      formData.put("pc2_migration_item_family_id", this.pc2MigrationItemFamilyId);
+    }
+
+    if (this.pc2MigrationId != null) {
+
+      formData.put("pc2_migration_id", this.pc2MigrationId);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.metadata != null) {
+
+      formData.put("metadata", this.metadata);
+    }
+
+    if (this.isGiftable != null) {
+
+      formData.put("is_giftable", this.isGiftable);
+    }
+
+    if (this.isShippable != null) {
+
+      formData.put("is_shippable", this.isShippable);
+    }
+
+    if (this.enabledForCheckout != null) {
+
+      formData.put("enabled_for_checkout", this.enabledForCheckout);
+    }
+
+    if (this.enabledInPortal != null) {
+
+      formData.put("enabled_in_portal", this.enabledInPortal);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.isRecurring != null) {
+
+      formData.put("is_recurring", this.isRecurring);
+    }
+
+    if (this.giftClaimRedirectUrl != null) {
+
+      formData.put("gift_claim_redirect_url", this.giftClaimRedirectUrl);
+    }
+
+    if (this.includedInMrr != null) {
+
+      formData.put("included_in_mrr", this.includedInMrr);
+    }
+
+    if (this.unit != null) {
+
+      formData.put("unit", this.unit);
+    }
+
+    if (this.pc2MigrationItemPrices != null) {
+
+      // List of objects
+      for (int i = 0; i < this.pc2MigrationItemPrices.size(); i++) {
+        Pc2MigrationItemPricesParams item = this.pc2MigrationItemPrices.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "pc2_migration_item_prices[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for Pc2MigrationItemCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static Pc2MigrationItemCreateBuilder builder() {
+    return new Pc2MigrationItemCreateBuilder();
+  }
+
+  public static final class Pc2MigrationItemCreateBuilder {
+
+    private String id;
+
+    private String name;
+
+    private Pc1Type pc1Type;
+
+    private String pc2MigrationItemFamilyId;
+
+    private String pc2MigrationId;
+
+    private String description;
+
+    private String metadata;
+
+    private Boolean isGiftable;
+
+    private Boolean isShippable;
+
+    private Boolean enabledForCheckout;
+
+    private Boolean enabledInPortal;
+
+    private String redirectUrl;
+
+    private Boolean isRecurring;
+
+    private String giftClaimRedirectUrl;
+
+    private Boolean includedInMrr;
+
+    private String unit;
+
+    private List<Pc2MigrationItemPricesParams> pc2MigrationItemPrices;
+
+    private Pc2MigrationItemCreateBuilder() {}
+
+    public Pc2MigrationItemCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder pc1Type(Pc1Type value) {
+      this.pc1Type = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder pc2MigrationItemFamilyId(String value) {
+      this.pc2MigrationItemFamilyId = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder pc2MigrationId(String value) {
+      this.pc2MigrationId = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder metadata(String value) {
+      this.metadata = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder isGiftable(Boolean value) {
+      this.isGiftable = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder isShippable(Boolean value) {
+      this.isShippable = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder enabledForCheckout(Boolean value) {
+      this.enabledForCheckout = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder enabledInPortal(Boolean value) {
+      this.enabledInPortal = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder isRecurring(Boolean value) {
+      this.isRecurring = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder giftClaimRedirectUrl(String value) {
+      this.giftClaimRedirectUrl = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder includedInMrr(Boolean value) {
+      this.includedInMrr = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder unit(String value) {
+      this.unit = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateBuilder pc2MigrationItemPrices(
+        List<Pc2MigrationItemPricesParams> value) {
+      this.pc2MigrationItemPrices = value;
+      return this;
+    }
+
+    public Pc2MigrationItemCreateParams build() {
+      return new Pc2MigrationItemCreateParams(this);
+    }
+  }
+
+  public enum Pc1Type {
+    PLAN("plan"),
+
+    ADDON("addon"),
+
+    /** An enum member indicating that Pc1Type was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Pc1Type(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Pc1Type fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Pc1Type enumValue : Pc1Type.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class Pc2MigrationItemPricesParams {
+
+    private final String id;
+
+    private final String name;
+
+    private final String description;
+
+    private final String metadata;
+
+    private final String refEntityId;
+
+    private Pc2MigrationItemPricesParams(Pc2MigrationItemPricesBuilder builder) {
+
+      this.id = builder.id;
+
+      this.name = builder.name;
+
+      this.description = builder.description;
+
+      this.metadata = builder.metadata;
+
+      this.refEntityId = builder.refEntityId;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getName() {
+      return name;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public String getMetadata() {
+      return metadata;
+    }
+
+    public String getRefEntityId() {
+      return refEntityId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.name != null) {
+
+        formData.put("name", this.name);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.metadata != null) {
+
+        formData.put("metadata", this.metadata);
+      }
+
+      if (this.refEntityId != null) {
+
+        formData.put("ref_entity_id", this.refEntityId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for Pc2MigrationItemPricesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static Pc2MigrationItemPricesBuilder builder() {
+      return new Pc2MigrationItemPricesBuilder();
+    }
+
+    public static final class Pc2MigrationItemPricesBuilder {
+
+      private String id;
+
+      private String name;
+
+      private String description;
+
+      private String metadata;
+
+      private String refEntityId;
+
+      private Pc2MigrationItemPricesBuilder() {}
+
+      public Pc2MigrationItemPricesBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public Pc2MigrationItemPricesBuilder name(String value) {
+        this.name = value;
+        return this;
+      }
+
+      public Pc2MigrationItemPricesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public Pc2MigrationItemPricesBuilder metadata(String value) {
+        this.metadata = value;
+        return this;
+      }
+
+      public Pc2MigrationItemPricesBuilder refEntityId(String value) {
+        this.refEntityId = value;
+        return this;
+      }
+
+      public Pc2MigrationItemPricesParams build() {
+        return new Pc2MigrationItemPricesParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemDeleteParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemDeleteParams.java
index 4b030ec0..bc9fc58f 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemDeleteParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.pc2MigrationItem.params;
+package com.chargebee.v4.models.pc2MigrationItem.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class Pc2MigrationItemDeleteParams {
 
-  private final Map<String, Object> formData;
-
-  private Pc2MigrationItemDeleteParams(Pc2MigrationItemDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private Pc2MigrationItemDeleteParams(Pc2MigrationItemDeleteBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static Pc2MigrationItemDeleteBuilder builder() {
   }
 
   public static final class Pc2MigrationItemDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private Pc2MigrationItemDeleteBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemListApplicableAddonsParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemListApplicableAddonsParams.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemListApplicableAddonsParams.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemListApplicableAddonsParams.java
index 2186008a..ca86e143 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemListApplicableAddonsParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemListApplicableAddonsParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.pc2MigrationItem.params;
+package com.chargebee.v4.models.pc2MigrationItem.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemListParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemListParams.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemListParams.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemListParams.java
index 23070d39..f60925c0 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemListParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.pc2MigrationItem.params;
+package com.chargebee.v4.models.pc2MigrationItem.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemRetrieveParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemRetrieveParams.java
index dfd6afaa..30103e4b 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItem/params/Pc2MigrationItemRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.pc2MigrationItem.params;
+package com.chargebee.v4.models.pc2MigrationItem.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemUpdateParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemUpdateParams.java
new file mode 100644
index 00000000..87e17f7d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/params/Pc2MigrationItemUpdateParams.java
@@ -0,0 +1,480 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.pc2MigrationItem.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class Pc2MigrationItemUpdateParams {
+
+  private final String name;
+
+  private final String id;
+
+  private final String pc2MigrationItemFamilyId;
+
+  private final String description;
+
+  private final String metadata;
+
+  private final Boolean isGiftable;
+
+  private final Boolean isShippable;
+
+  private final Boolean enabledForCheckout;
+
+  private final Boolean enabledInPortal;
+
+  private final String redirectUrl;
+
+  private final Boolean isRecurring;
+
+  private final String giftClaimRedirectUrl;
+
+  private final Boolean includedInMrr;
+
+  private final String unit;
+
+  private final List<Pc2MigrationItemPricesParams> pc2MigrationItemPrices;
+
+  private Pc2MigrationItemUpdateParams(Pc2MigrationItemUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.id = builder.id;
+
+    this.pc2MigrationItemFamilyId = builder.pc2MigrationItemFamilyId;
+
+    this.description = builder.description;
+
+    this.metadata = builder.metadata;
+
+    this.isGiftable = builder.isGiftable;
+
+    this.isShippable = builder.isShippable;
+
+    this.enabledForCheckout = builder.enabledForCheckout;
+
+    this.enabledInPortal = builder.enabledInPortal;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.isRecurring = builder.isRecurring;
+
+    this.giftClaimRedirectUrl = builder.giftClaimRedirectUrl;
+
+    this.includedInMrr = builder.includedInMrr;
+
+    this.unit = builder.unit;
+
+    this.pc2MigrationItemPrices = builder.pc2MigrationItemPrices;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getPc2MigrationItemFamilyId() {
+    return pc2MigrationItemFamilyId;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public String getMetadata() {
+    return metadata;
+  }
+
+  public Boolean getIsGiftable() {
+    return isGiftable;
+  }
+
+  public Boolean getIsShippable() {
+    return isShippable;
+  }
+
+  public Boolean getEnabledForCheckout() {
+    return enabledForCheckout;
+  }
+
+  public Boolean getEnabledInPortal() {
+    return enabledInPortal;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public Boolean getIsRecurring() {
+    return isRecurring;
+  }
+
+  public String getGiftClaimRedirectUrl() {
+    return giftClaimRedirectUrl;
+  }
+
+  public Boolean getIncludedInMrr() {
+    return includedInMrr;
+  }
+
+  public String getUnit() {
+    return unit;
+  }
+
+  public List<Pc2MigrationItemPricesParams> getPc2MigrationItemPrices() {
+    return pc2MigrationItemPrices;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.pc2MigrationItemFamilyId != null) {
+
+      formData.put("pc2_migration_item_family_id", this.pc2MigrationItemFamilyId);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.metadata != null) {
+
+      formData.put("metadata", this.metadata);
+    }
+
+    if (this.isGiftable != null) {
+
+      formData.put("is_giftable", this.isGiftable);
+    }
+
+    if (this.isShippable != null) {
+
+      formData.put("is_shippable", this.isShippable);
+    }
+
+    if (this.enabledForCheckout != null) {
+
+      formData.put("enabled_for_checkout", this.enabledForCheckout);
+    }
+
+    if (this.enabledInPortal != null) {
+
+      formData.put("enabled_in_portal", this.enabledInPortal);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.isRecurring != null) {
+
+      formData.put("is_recurring", this.isRecurring);
+    }
+
+    if (this.giftClaimRedirectUrl != null) {
+
+      formData.put("gift_claim_redirect_url", this.giftClaimRedirectUrl);
+    }
+
+    if (this.includedInMrr != null) {
+
+      formData.put("included_in_mrr", this.includedInMrr);
+    }
+
+    if (this.unit != null) {
+
+      formData.put("unit", this.unit);
+    }
+
+    if (this.pc2MigrationItemPrices != null) {
+
+      // List of objects
+      for (int i = 0; i < this.pc2MigrationItemPrices.size(); i++) {
+        Pc2MigrationItemPricesParams item = this.pc2MigrationItemPrices.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "pc2_migration_item_prices[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for Pc2MigrationItemUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static Pc2MigrationItemUpdateBuilder builder() {
+    return new Pc2MigrationItemUpdateBuilder();
+  }
+
+  public static final class Pc2MigrationItemUpdateBuilder {
+
+    private String name;
+
+    private String id;
+
+    private String pc2MigrationItemFamilyId;
+
+    private String description;
+
+    private String metadata;
+
+    private Boolean isGiftable;
+
+    private Boolean isShippable;
+
+    private Boolean enabledForCheckout;
+
+    private Boolean enabledInPortal;
+
+    private String redirectUrl;
+
+    private Boolean isRecurring;
+
+    private String giftClaimRedirectUrl;
+
+    private Boolean includedInMrr;
+
+    private String unit;
+
+    private List<Pc2MigrationItemPricesParams> pc2MigrationItemPrices;
+
+    private Pc2MigrationItemUpdateBuilder() {}
+
+    public Pc2MigrationItemUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder pc2MigrationItemFamilyId(String value) {
+      this.pc2MigrationItemFamilyId = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder metadata(String value) {
+      this.metadata = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder isGiftable(Boolean value) {
+      this.isGiftable = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder isShippable(Boolean value) {
+      this.isShippable = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder enabledForCheckout(Boolean value) {
+      this.enabledForCheckout = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder enabledInPortal(Boolean value) {
+      this.enabledInPortal = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder isRecurring(Boolean value) {
+      this.isRecurring = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder giftClaimRedirectUrl(String value) {
+      this.giftClaimRedirectUrl = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder includedInMrr(Boolean value) {
+      this.includedInMrr = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder unit(String value) {
+      this.unit = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateBuilder pc2MigrationItemPrices(
+        List<Pc2MigrationItemPricesParams> value) {
+      this.pc2MigrationItemPrices = value;
+      return this;
+    }
+
+    public Pc2MigrationItemUpdateParams build() {
+      return new Pc2MigrationItemUpdateParams(this);
+    }
+  }
+
+  public static final class Pc2MigrationItemPricesParams {
+
+    private final String id;
+
+    private final String name;
+
+    private final String description;
+
+    private final String metadata;
+
+    private final String refEntityId;
+
+    private Pc2MigrationItemPricesParams(Pc2MigrationItemPricesBuilder builder) {
+
+      this.id = builder.id;
+
+      this.name = builder.name;
+
+      this.description = builder.description;
+
+      this.metadata = builder.metadata;
+
+      this.refEntityId = builder.refEntityId;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getName() {
+      return name;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public String getMetadata() {
+      return metadata;
+    }
+
+    public String getRefEntityId() {
+      return refEntityId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.name != null) {
+
+        formData.put("name", this.name);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.metadata != null) {
+
+        formData.put("metadata", this.metadata);
+      }
+
+      if (this.refEntityId != null) {
+
+        formData.put("ref_entity_id", this.refEntityId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for Pc2MigrationItemPricesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static Pc2MigrationItemPricesBuilder builder() {
+      return new Pc2MigrationItemPricesBuilder();
+    }
+
+    public static final class Pc2MigrationItemPricesBuilder {
+
+      private String id;
+
+      private String name;
+
+      private String description;
+
+      private String metadata;
+
+      private String refEntityId;
+
+      private Pc2MigrationItemPricesBuilder() {}
+
+      public Pc2MigrationItemPricesBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public Pc2MigrationItemPricesBuilder name(String value) {
+        this.name = value;
+        return this;
+      }
+
+      public Pc2MigrationItemPricesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public Pc2MigrationItemPricesBuilder metadata(String value) {
+        this.metadata = value;
+        return this;
+      }
+
+      public Pc2MigrationItemPricesBuilder refEntityId(String value) {
+        this.refEntityId = value;
+        return this;
+      }
+
+      public Pc2MigrationItemPricesParams build() {
+        return new Pc2MigrationItemPricesParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemCreateResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemCreateResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemCreateResponse.java
index 5a2611f6..30746fdf 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemCreateResponse.java
@@ -1,6 +1,6 @@
-package com.chargebee.v4.core.responses.pc2MigrationItem;
+package com.chargebee.v4.models.pc2MigrationItem.responses;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.transport.Response;
 
 /**
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemDeleteResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemDeleteResponse.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemDeleteResponse.java
index 2c605d90..c0aa3803 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemDeleteResponse.java
@@ -1,6 +1,6 @@
-package com.chargebee.v4.core.responses.pc2MigrationItem;
+package com.chargebee.v4.models.pc2MigrationItem.responses;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemListApplicableAddonsResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemListApplicableAddonsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemListApplicableAddonsResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemListApplicableAddonsResponse.java
index afad283f..62df4ac7 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemListApplicableAddonsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemListApplicableAddonsResponse.java
@@ -1,11 +1,12 @@
-package com.chargebee.v4.core.responses.pc2MigrationItem;
+package com.chargebee.v4.models.pc2MigrationItem.responses;
 
 import java.util.List;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.Pc2MigrationItemService;
-import com.chargebee.v4.core.models.pc2MigrationItem.params.Pc2MigrationItemListApplicableAddonsParams;
+import com.chargebee.v4.services.Pc2MigrationItemService;
+import com.chargebee.v4.models.pc2MigrationItem.params.Pc2MigrationItemListApplicableAddonsParams;
 
 /**
  * Immutable response object for Pc2MigrationItemListApplicableAddons operation. Contains paginated
@@ -102,9 +103,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public Pc2MigrationItemListApplicableAddonsResponse nextPage() throws Exception {
+  public Pc2MigrationItemListApplicableAddonsResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemListResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemListResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemListResponse.java
index f512d6df..0df83f65 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemListResponse.java
@@ -1,11 +1,12 @@
-package com.chargebee.v4.core.responses.pc2MigrationItem;
+package com.chargebee.v4.models.pc2MigrationItem.responses;
 
 import java.util.List;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.Pc2MigrationItemService;
-import com.chargebee.v4.core.models.pc2MigrationItem.params.Pc2MigrationItemListParams;
+import com.chargebee.v4.services.Pc2MigrationItemService;
+import com.chargebee.v4.models.pc2MigrationItem.params.Pc2MigrationItemListParams;
 
 /** Immutable response object for Pc2MigrationItemList operation. Contains paginated list data. */
 public final class Pc2MigrationItemListResponse {
@@ -97,9 +98,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public Pc2MigrationItemListResponse nextPage() throws Exception {
+  public Pc2MigrationItemListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemRetrieveResponse.java
new file mode 100644
index 00000000..57dc9e77
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemRetrieveResponse.java
@@ -0,0 +1,72 @@
+package com.chargebee.v4.models.pc2MigrationItem.responses;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for Pc2MigrationItemRetrieve operation. Contains the response data from
+ * a single resource get operation.
+ */
+public final class Pc2MigrationItemRetrieveResponse extends BaseResponse {
+  private final Object pc2MigrationItem;
+
+  private Pc2MigrationItemRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.pc2MigrationItem = builder.pc2MigrationItem;
+  }
+
+  /** Parse JSON response into Pc2MigrationItemRetrieveResponse object. */
+  public static Pc2MigrationItemRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into Pc2MigrationItemRetrieveResponse object with HTTP response. */
+  public static Pc2MigrationItemRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.pc2MigrationItem(JsonUtil.getObject(json, "pc2_migration_item"));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse Pc2MigrationItemRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for Pc2MigrationItemRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for Pc2MigrationItemRetrieveResponse. */
+  public static class Builder {
+
+    private Object pc2MigrationItem;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder pc2MigrationItem(Object pc2MigrationItem) {
+      this.pc2MigrationItem = pc2MigrationItem;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public Pc2MigrationItemRetrieveResponse build() {
+      return new Pc2MigrationItemRetrieveResponse(this);
+    }
+  }
+
+  /** Get the pc2MigrationItem from the response. */
+  public Object getPc2MigrationItem() {
+    return pc2MigrationItem;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemUpdateResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemUpdateResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemUpdateResponse.java
index 6ad6220e..153a4bb7 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItem/Pc2MigrationItemUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemUpdateResponse.java
@@ -1,6 +1,6 @@
-package com.chargebee.v4.core.responses.pc2MigrationItem;
+package com.chargebee.v4.models.pc2MigrationItem.responses;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.transport.Response;
 
 /**
diff --git a/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyCreateParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyCreateParams.java
new file mode 100644
index 00000000..061ead60
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyCreateParams.java
@@ -0,0 +1,140 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.pc2MigrationItemFamily.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class Pc2MigrationItemFamilyCreateParams {
+
+  private final String name;
+
+  private final String id;
+
+  private final String description;
+
+  private final Boolean isDefault;
+
+  private final String pc2MigrationId;
+
+  private Pc2MigrationItemFamilyCreateParams(Pc2MigrationItemFamilyCreateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.id = builder.id;
+
+    this.description = builder.description;
+
+    this.isDefault = builder.isDefault;
+
+    this.pc2MigrationId = builder.pc2MigrationId;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public Boolean getIsDefault() {
+    return isDefault;
+  }
+
+  public String getPc2MigrationId() {
+    return pc2MigrationId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.isDefault != null) {
+
+      formData.put("is_default", this.isDefault);
+    }
+
+    if (this.pc2MigrationId != null) {
+
+      formData.put("pc2_migration_id", this.pc2MigrationId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for Pc2MigrationItemFamilyCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static Pc2MigrationItemFamilyCreateBuilder builder() {
+    return new Pc2MigrationItemFamilyCreateBuilder();
+  }
+
+  public static final class Pc2MigrationItemFamilyCreateBuilder {
+
+    private String name;
+
+    private String id;
+
+    private String description;
+
+    private Boolean isDefault;
+
+    private String pc2MigrationId;
+
+    private Pc2MigrationItemFamilyCreateBuilder() {}
+
+    public Pc2MigrationItemFamilyCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public Pc2MigrationItemFamilyCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public Pc2MigrationItemFamilyCreateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public Pc2MigrationItemFamilyCreateBuilder isDefault(Boolean value) {
+      this.isDefault = value;
+      return this;
+    }
+
+    public Pc2MigrationItemFamilyCreateBuilder pc2MigrationId(String value) {
+      this.pc2MigrationId = value;
+      return this;
+    }
+
+    public Pc2MigrationItemFamilyCreateParams build() {
+      return new Pc2MigrationItemFamilyCreateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyDeleteParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyDeleteParams.java
index abe49523..aed845d0 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyDeleteParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.pc2MigrationItemFamily.params;
+package com.chargebee.v4.models.pc2MigrationItemFamily.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class Pc2MigrationItemFamilyDeleteParams {
 
-  private final Map<String, Object> formData;
-
-  private Pc2MigrationItemFamilyDeleteParams(Pc2MigrationItemFamilyDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private Pc2MigrationItemFamilyDeleteParams(Pc2MigrationItemFamilyDeleteBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static Pc2MigrationItemFamilyDeleteBuilder builder() {
   }
 
   public static final class Pc2MigrationItemFamilyDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private Pc2MigrationItemFamilyDeleteBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyListParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyListParams.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyListParams.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyListParams.java
index 5ece45db..6a491053 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyListParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.pc2MigrationItemFamily.params;
+package com.chargebee.v4.models.pc2MigrationItemFamily.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyRetrieveParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyRetrieveParams.java
index e42558b0..779db7e3 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.pc2MigrationItemFamily.params;
+package com.chargebee.v4.models.pc2MigrationItemFamily.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyUpdateParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyUpdateParams.java
new file mode 100644
index 00000000..6df48b0e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/params/Pc2MigrationItemFamilyUpdateParams.java
@@ -0,0 +1,120 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.pc2MigrationItemFamily.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class Pc2MigrationItemFamilyUpdateParams {
+
+  private final String name;
+
+  private final String id;
+
+  private final Boolean isDefault;
+
+  private final String description;
+
+  private Pc2MigrationItemFamilyUpdateParams(Pc2MigrationItemFamilyUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.id = builder.id;
+
+    this.isDefault = builder.isDefault;
+
+    this.description = builder.description;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public Boolean getIsDefault() {
+    return isDefault;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.isDefault != null) {
+
+      formData.put("is_default", this.isDefault);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for Pc2MigrationItemFamilyUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static Pc2MigrationItemFamilyUpdateBuilder builder() {
+    return new Pc2MigrationItemFamilyUpdateBuilder();
+  }
+
+  public static final class Pc2MigrationItemFamilyUpdateBuilder {
+
+    private String name;
+
+    private String id;
+
+    private Boolean isDefault;
+
+    private String description;
+
+    private Pc2MigrationItemFamilyUpdateBuilder() {}
+
+    public Pc2MigrationItemFamilyUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public Pc2MigrationItemFamilyUpdateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public Pc2MigrationItemFamilyUpdateBuilder isDefault(Boolean value) {
+      this.isDefault = value;
+      return this;
+    }
+
+    public Pc2MigrationItemFamilyUpdateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public Pc2MigrationItemFamilyUpdateParams build() {
+      return new Pc2MigrationItemFamilyUpdateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyCreateResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyCreateResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyCreateResponse.java
index 4f207e27..91ebce5d 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyCreateResponse.java
@@ -1,6 +1,6 @@
-package com.chargebee.v4.core.responses.pc2MigrationItemFamily;
+package com.chargebee.v4.models.pc2MigrationItemFamily.responses;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.transport.Response;
 
 /**
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyDeleteResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyDeleteResponse.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyDeleteResponse.java
index 03507426..7153f26e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyDeleteResponse.java
@@ -1,6 +1,6 @@
-package com.chargebee.v4.core.responses.pc2MigrationItemFamily;
+package com.chargebee.v4.models.pc2MigrationItemFamily.responses;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyListResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyListResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyListResponse.java
index 77d4aa82..1f9fe18c 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyListResponse.java
@@ -1,11 +1,12 @@
-package com.chargebee.v4.core.responses.pc2MigrationItemFamily;
+package com.chargebee.v4.models.pc2MigrationItemFamily.responses;
 
 import java.util.List;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.Pc2MigrationItemFamilyService;
-import com.chargebee.v4.core.models.pc2MigrationItemFamily.params.Pc2MigrationItemFamilyListParams;
+import com.chargebee.v4.services.Pc2MigrationItemFamilyService;
+import com.chargebee.v4.models.pc2MigrationItemFamily.params.Pc2MigrationItemFamilyListParams;
 
 /**
  * Immutable response object for Pc2MigrationItemFamilyList operation. Contains paginated list data.
@@ -99,9 +100,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public Pc2MigrationItemFamilyListResponse nextPage() throws Exception {
+  public Pc2MigrationItemFamilyListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyRetrieveResponse.java
new file mode 100644
index 00000000..485bb3af
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyRetrieveResponse.java
@@ -0,0 +1,74 @@
+package com.chargebee.v4.models.pc2MigrationItemFamily.responses;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for Pc2MigrationItemFamilyRetrieve operation. Contains the response
+ * data from a single resource get operation.
+ */
+public final class Pc2MigrationItemFamilyRetrieveResponse extends BaseResponse {
+  private final Object pc2MigrationItemFamily;
+
+  private Pc2MigrationItemFamilyRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.pc2MigrationItemFamily = builder.pc2MigrationItemFamily;
+  }
+
+  /** Parse JSON response into Pc2MigrationItemFamilyRetrieveResponse object. */
+  public static Pc2MigrationItemFamilyRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into Pc2MigrationItemFamilyRetrieveResponse object with HTTP response. */
+  public static Pc2MigrationItemFamilyRetrieveResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.pc2MigrationItemFamily(JsonUtil.getObject(json, "pc2_migration_item_family"));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse Pc2MigrationItemFamilyRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for Pc2MigrationItemFamilyRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for Pc2MigrationItemFamilyRetrieveResponse. */
+  public static class Builder {
+
+    private Object pc2MigrationItemFamily;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder pc2MigrationItemFamily(Object pc2MigrationItemFamily) {
+      this.pc2MigrationItemFamily = pc2MigrationItemFamily;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public Pc2MigrationItemFamilyRetrieveResponse build() {
+      return new Pc2MigrationItemFamilyRetrieveResponse(this);
+    }
+  }
+
+  /** Get the pc2MigrationItemFamily from the response. */
+  public Object getPc2MigrationItemFamily() {
+    return pc2MigrationItemFamily;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyUpdateResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyUpdateResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyUpdateResponse.java
index 034810f0..92aedb32 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemFamily/Pc2MigrationItemFamilyUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyUpdateResponse.java
@@ -1,6 +1,6 @@
-package com.chargebee.v4.core.responses.pc2MigrationItemFamily;
+package com.chargebee.v4.models.pc2MigrationItemFamily.responses;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.transport.Response;
 
 /**
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceDeleteParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceDeleteParams.java
index d4bf2cb3..a072d92f 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceDeleteParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.pc2MigrationItemPrice.params;
+package com.chargebee.v4.models.pc2MigrationItemPrice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class Pc2MigrationItemPriceDeleteParams {
 
-  private final Map<String, Object> formData;
-
-  private Pc2MigrationItemPriceDeleteParams(Pc2MigrationItemPriceDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private Pc2MigrationItemPriceDeleteParams(Pc2MigrationItemPriceDeleteBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static Pc2MigrationItemPriceDeleteBuilder builder() {
   }
 
   public static final class Pc2MigrationItemPriceDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private Pc2MigrationItemPriceDeleteBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceListParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceListParams.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceListParams.java
index 597a0f0b..8a9f9922 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceListParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.pc2MigrationItemPrice.params;
+package com.chargebee.v4.models.pc2MigrationItemPrice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceRetrieveParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceRetrieveParams.java
index c545a4a7..b43acaef 100644
--- a/src/main/java/com/chargebee/v4/core/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.pc2MigrationItemPrice.params;
+package com.chargebee.v4.models.pc2MigrationItemPrice.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceUpdateParams.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceUpdateParams.java
new file mode 100644
index 00000000..9e3ea147
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/params/Pc2MigrationItemPriceUpdateParams.java
@@ -0,0 +1,160 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.pc2MigrationItemPrice.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class Pc2MigrationItemPriceUpdateParams {
+
+  private final String name;
+
+  private final String pc2MigrationItemId;
+
+  private final String description;
+
+  private final String metadata;
+
+  private final String sanitizedPc1Id;
+
+  private final Boolean isPrimaryAttachedItem;
+
+  private Pc2MigrationItemPriceUpdateParams(Pc2MigrationItemPriceUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.pc2MigrationItemId = builder.pc2MigrationItemId;
+
+    this.description = builder.description;
+
+    this.metadata = builder.metadata;
+
+    this.sanitizedPc1Id = builder.sanitizedPc1Id;
+
+    this.isPrimaryAttachedItem = builder.isPrimaryAttachedItem;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getPc2MigrationItemId() {
+    return pc2MigrationItemId;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public String getMetadata() {
+    return metadata;
+  }
+
+  public String getSanitizedPc1Id() {
+    return sanitizedPc1Id;
+  }
+
+  public Boolean getIsPrimaryAttachedItem() {
+    return isPrimaryAttachedItem;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.pc2MigrationItemId != null) {
+
+      formData.put("pc2_migration_item_id", this.pc2MigrationItemId);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.metadata != null) {
+
+      formData.put("metadata", this.metadata);
+    }
+
+    if (this.sanitizedPc1Id != null) {
+
+      formData.put("sanitized_pc1_id", this.sanitizedPc1Id);
+    }
+
+    if (this.isPrimaryAttachedItem != null) {
+
+      formData.put("is_primary_attached_item", this.isPrimaryAttachedItem);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for Pc2MigrationItemPriceUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static Pc2MigrationItemPriceUpdateBuilder builder() {
+    return new Pc2MigrationItemPriceUpdateBuilder();
+  }
+
+  public static final class Pc2MigrationItemPriceUpdateBuilder {
+
+    private String name;
+
+    private String pc2MigrationItemId;
+
+    private String description;
+
+    private String metadata;
+
+    private String sanitizedPc1Id;
+
+    private Boolean isPrimaryAttachedItem;
+
+    private Pc2MigrationItemPriceUpdateBuilder() {}
+
+    public Pc2MigrationItemPriceUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public Pc2MigrationItemPriceUpdateBuilder pc2MigrationItemId(String value) {
+      this.pc2MigrationItemId = value;
+      return this;
+    }
+
+    public Pc2MigrationItemPriceUpdateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public Pc2MigrationItemPriceUpdateBuilder metadata(String value) {
+      this.metadata = value;
+      return this;
+    }
+
+    public Pc2MigrationItemPriceUpdateBuilder sanitizedPc1Id(String value) {
+      this.sanitizedPc1Id = value;
+      return this;
+    }
+
+    public Pc2MigrationItemPriceUpdateBuilder isPrimaryAttachedItem(Boolean value) {
+      this.isPrimaryAttachedItem = value;
+      return this;
+    }
+
+    public Pc2MigrationItemPriceUpdateParams build() {
+      return new Pc2MigrationItemPriceUpdateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemPrice/Pc2MigrationItemPriceDeleteResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/responses/Pc2MigrationItemPriceDeleteResponse.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemPrice/Pc2MigrationItemPriceDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/responses/Pc2MigrationItemPriceDeleteResponse.java
index 90beef1f..4f9bec27 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemPrice/Pc2MigrationItemPriceDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/responses/Pc2MigrationItemPriceDeleteResponse.java
@@ -1,6 +1,6 @@
-package com.chargebee.v4.core.responses.pc2MigrationItemPrice;
+package com.chargebee.v4.models.pc2MigrationItemPrice.responses;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemPrice/Pc2MigrationItemPriceListResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/responses/Pc2MigrationItemPriceListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemPrice/Pc2MigrationItemPriceListResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/responses/Pc2MigrationItemPriceListResponse.java
index a62ac7e6..58fbc675 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemPrice/Pc2MigrationItemPriceListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/responses/Pc2MigrationItemPriceListResponse.java
@@ -1,11 +1,12 @@
-package com.chargebee.v4.core.responses.pc2MigrationItemPrice;
+package com.chargebee.v4.models.pc2MigrationItemPrice.responses;
 
 import java.util.List;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.Pc2MigrationItemPriceService;
-import com.chargebee.v4.core.models.pc2MigrationItemPrice.params.Pc2MigrationItemPriceListParams;
+import com.chargebee.v4.services.Pc2MigrationItemPriceService;
+import com.chargebee.v4.models.pc2MigrationItemPrice.params.Pc2MigrationItemPriceListParams;
 
 /**
  * Immutable response object for Pc2MigrationItemPriceList operation. Contains paginated list data.
@@ -99,9 +100,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public Pc2MigrationItemPriceListResponse nextPage() throws Exception {
+  public Pc2MigrationItemPriceListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/responses/Pc2MigrationItemPriceRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/responses/Pc2MigrationItemPriceRetrieveResponse.java
new file mode 100644
index 00000000..0fb13626
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/responses/Pc2MigrationItemPriceRetrieveResponse.java
@@ -0,0 +1,73 @@
+package com.chargebee.v4.models.pc2MigrationItemPrice.responses;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for Pc2MigrationItemPriceRetrieve operation. Contains the response data
+ * from a single resource get operation.
+ */
+public final class Pc2MigrationItemPriceRetrieveResponse extends BaseResponse {
+  private final Object pc2MigrationItemPrice;
+
+  private Pc2MigrationItemPriceRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.pc2MigrationItemPrice = builder.pc2MigrationItemPrice;
+  }
+
+  /** Parse JSON response into Pc2MigrationItemPriceRetrieveResponse object. */
+  public static Pc2MigrationItemPriceRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into Pc2MigrationItemPriceRetrieveResponse object with HTTP response. */
+  public static Pc2MigrationItemPriceRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.pc2MigrationItemPrice(JsonUtil.getObject(json, "pc2_migration_item_price"));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse Pc2MigrationItemPriceRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for Pc2MigrationItemPriceRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for Pc2MigrationItemPriceRetrieveResponse. */
+  public static class Builder {
+
+    private Object pc2MigrationItemPrice;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder pc2MigrationItemPrice(Object pc2MigrationItemPrice) {
+      this.pc2MigrationItemPrice = pc2MigrationItemPrice;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public Pc2MigrationItemPriceRetrieveResponse build() {
+      return new Pc2MigrationItemPriceRetrieveResponse(this);
+    }
+  }
+
+  /** Get the pc2MigrationItemPrice from the response. */
+  public Object getPc2MigrationItemPrice() {
+    return pc2MigrationItemPrice;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemPrice/Pc2MigrationItemPriceUpdateResponse.java b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/responses/Pc2MigrationItemPriceUpdateResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemPrice/Pc2MigrationItemPriceUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/responses/Pc2MigrationItemPriceUpdateResponse.java
index 1e1ac1de..f5bdb021 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pc2MigrationItemPrice/Pc2MigrationItemPriceUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/responses/Pc2MigrationItemPriceUpdateResponse.java
@@ -1,6 +1,6 @@
-package com.chargebee.v4.core.responses.pc2MigrationItemPrice;
+package com.chargebee.v4.models.pc2MigrationItemPrice.responses;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.transport.Response;
 
 /**
diff --git a/src/main/java/com/chargebee/v4/core/models/personalizedOffer/PersonalizedOffer.java b/src/main/java/com/chargebee/v4/models/personalizedOffer/PersonalizedOffer.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/personalizedOffer/PersonalizedOffer.java
rename to src/main/java/com/chargebee/v4/models/personalizedOffer/PersonalizedOffer.java
index 56c3b88c..4aa779b1 100644
--- a/src/main/java/com/chargebee/v4/core/models/personalizedOffer/PersonalizedOffer.java
+++ b/src/main/java/com/chargebee/v4/models/personalizedOffer/PersonalizedOffer.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.personalizedOffer;
+package com.chargebee.v4.models.personalizedOffer;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.util.List;
diff --git a/src/main/java/com/chargebee/v4/models/personalizedOffer/params/PersonalizedOffersParams.java b/src/main/java/com/chargebee/v4/models/personalizedOffer/params/PersonalizedOffersParams.java
new file mode 100644
index 00000000..cba1109a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/personalizedOffer/params/PersonalizedOffersParams.java
@@ -0,0 +1,355 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.personalizedOffer.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class PersonalizedOffersParams {
+
+  private final String firstName;
+
+  private final String lastName;
+
+  private final String email;
+
+  private final List<String> roles;
+
+  private final String externalUserId;
+
+  private final String subscriptionId;
+
+  private final String customerId;
+
+  private final java.util.Map<String, Object> custom;
+
+  private final RequestContextParams requestContext;
+
+  private PersonalizedOffersParams(PersonalizedOffersBuilder builder) {
+
+    this.firstName = builder.firstName;
+
+    this.lastName = builder.lastName;
+
+    this.email = builder.email;
+
+    this.roles = builder.roles;
+
+    this.externalUserId = builder.externalUserId;
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.customerId = builder.customerId;
+
+    this.custom = builder.custom;
+
+    this.requestContext = builder.requestContext;
+  }
+
+  public String getFirstName() {
+    return firstName;
+  }
+
+  public String getLastName() {
+    return lastName;
+  }
+
+  public String getEmail() {
+    return email;
+  }
+
+  public List<String> getRoles() {
+    return roles;
+  }
+
+  public String getExternalUserId() {
+    return externalUserId;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public java.util.Map<String, Object> getCustom() {
+    return custom;
+  }
+
+  public RequestContextParams getRequestContext() {
+    return requestContext;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.firstName != null) {
+
+      formData.put("first_name", this.firstName);
+    }
+
+    if (this.lastName != null) {
+
+      formData.put("last_name", this.lastName);
+    }
+
+    if (this.email != null) {
+
+      formData.put("email", this.email);
+    }
+
+    if (this.roles != null) {
+
+      formData.put("roles", this.roles);
+    }
+
+    if (this.externalUserId != null) {
+
+      formData.put("external_user_id", this.externalUserId);
+    }
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.custom != null) {
+
+      formData.put("custom", JsonUtil.toJson(this.custom));
+    }
+
+    if (this.requestContext != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.requestContext.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "request_context[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PersonalizedOffersParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PersonalizedOffersBuilder builder() {
+    return new PersonalizedOffersBuilder();
+  }
+
+  public static final class PersonalizedOffersBuilder {
+
+    private String firstName;
+
+    private String lastName;
+
+    private String email;
+
+    private List<String> roles;
+
+    private String externalUserId;
+
+    private String subscriptionId;
+
+    private String customerId;
+
+    private java.util.Map<String, Object> custom;
+
+    private RequestContextParams requestContext;
+
+    private PersonalizedOffersBuilder() {}
+
+    public PersonalizedOffersBuilder firstName(String value) {
+      this.firstName = value;
+      return this;
+    }
+
+    public PersonalizedOffersBuilder lastName(String value) {
+      this.lastName = value;
+      return this;
+    }
+
+    public PersonalizedOffersBuilder email(String value) {
+      this.email = value;
+      return this;
+    }
+
+    public PersonalizedOffersBuilder roles(List<String> value) {
+      this.roles = value;
+      return this;
+    }
+
+    public PersonalizedOffersBuilder externalUserId(String value) {
+      this.externalUserId = value;
+      return this;
+    }
+
+    public PersonalizedOffersBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public PersonalizedOffersBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PersonalizedOffersBuilder custom(java.util.Map<String, Object> value) {
+      this.custom = value;
+      return this;
+    }
+
+    public PersonalizedOffersBuilder requestContext(RequestContextParams value) {
+      this.requestContext = value;
+      return this;
+    }
+
+    public PersonalizedOffersParams build() {
+      return new PersonalizedOffersParams(this);
+    }
+  }
+
+  public static final class RequestContextParams {
+
+    private final String userAgent;
+
+    private final String locale;
+
+    private final String timezone;
+
+    private final String url;
+
+    private final String referrerUrl;
+
+    private RequestContextParams(RequestContextBuilder builder) {
+
+      this.userAgent = builder.userAgent;
+
+      this.locale = builder.locale;
+
+      this.timezone = builder.timezone;
+
+      this.url = builder.url;
+
+      this.referrerUrl = builder.referrerUrl;
+    }
+
+    public String getUserAgent() {
+      return userAgent;
+    }
+
+    public String getLocale() {
+      return locale;
+    }
+
+    public String getTimezone() {
+      return timezone;
+    }
+
+    public String getUrl() {
+      return url;
+    }
+
+    public String getReferrerUrl() {
+      return referrerUrl;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.userAgent != null) {
+
+        formData.put("user_agent", this.userAgent);
+      }
+
+      if (this.locale != null) {
+
+        formData.put("locale", this.locale);
+      }
+
+      if (this.timezone != null) {
+
+        formData.put("timezone", this.timezone);
+      }
+
+      if (this.url != null) {
+
+        formData.put("url", this.url);
+      }
+
+      if (this.referrerUrl != null) {
+
+        formData.put("referrer_url", this.referrerUrl);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for RequestContextParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static RequestContextBuilder builder() {
+      return new RequestContextBuilder();
+    }
+
+    public static final class RequestContextBuilder {
+
+      private String userAgent;
+
+      private String locale;
+
+      private String timezone;
+
+      private String url;
+
+      private String referrerUrl;
+
+      private RequestContextBuilder() {}
+
+      public RequestContextBuilder userAgent(String value) {
+        this.userAgent = value;
+        return this;
+      }
+
+      public RequestContextBuilder locale(String value) {
+        this.locale = value;
+        return this;
+      }
+
+      public RequestContextBuilder timezone(String value) {
+        this.timezone = value;
+        return this;
+      }
+
+      public RequestContextBuilder url(String value) {
+        this.url = value;
+        return this;
+      }
+
+      public RequestContextBuilder referrerUrl(String value) {
+        this.referrerUrl = value;
+        return this;
+      }
+
+      public RequestContextParams build() {
+        return new RequestContextParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/personalizedOffer/responses/PersonalizedOffersResponse.java b/src/main/java/com/chargebee/v4/models/personalizedOffer/responses/PersonalizedOffersResponse.java
new file mode 100644
index 00000000..1266a53f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/personalizedOffer/responses/PersonalizedOffersResponse.java
@@ -0,0 +1,121 @@
+package com.chargebee.v4.models.personalizedOffer.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.brand.Brand;
+
+import com.chargebee.v4.models.personalizedOffer.PersonalizedOffer;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import java.sql.Timestamp;
+
+/**
+ * Immutable response object for PersonalizedOffers operation. Contains the response data from the
+ * API.
+ */
+public final class PersonalizedOffersResponse extends BaseResponse {
+  private final List<PersonalizedOffer> personalizedOffers;
+
+  private final Brand brand;
+
+  private final Timestamp expiresAt;
+
+  private PersonalizedOffersResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.personalizedOffers = builder.personalizedOffers;
+
+    this.brand = builder.brand;
+
+    this.expiresAt = builder.expiresAt;
+  }
+
+  /** Parse JSON response into PersonalizedOffersResponse object. */
+  public static PersonalizedOffersResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into PersonalizedOffersResponse object with HTTP response. */
+  public static PersonalizedOffersResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.personalizedOffers(
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "personalized_offers")).stream()
+              .map(PersonalizedOffer::fromJson)
+              .collect(java.util.stream.Collectors.toList()));
+
+      String __brandJson = JsonUtil.getObject(json, "brand");
+      if (__brandJson != null) {
+        builder.brand(Brand.fromJson(__brandJson));
+      }
+
+      builder.expiresAt(JsonUtil.getTimestamp(json, "expires_at"));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse PersonalizedOffersResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for PersonalizedOffersResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for PersonalizedOffersResponse. */
+  public static class Builder {
+
+    private List<PersonalizedOffer> personalizedOffers;
+
+    private Brand brand;
+
+    private Timestamp expiresAt;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder personalizedOffers(List<PersonalizedOffer> personalizedOffers) {
+      this.personalizedOffers = personalizedOffers;
+      return this;
+    }
+
+    public Builder brand(Brand brand) {
+      this.brand = brand;
+      return this;
+    }
+
+    public Builder expiresAt(Timestamp expiresAt) {
+      this.expiresAt = expiresAt;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public PersonalizedOffersResponse build() {
+      return new PersonalizedOffersResponse(this);
+    }
+  }
+
+  /** Get the personalizedOffers from the response. */
+  public List<PersonalizedOffer> getPersonalizedOffers() {
+    return personalizedOffers;
+  }
+
+  /** Get the brand from the response. */
+  public Brand getBrand() {
+    return brand;
+  }
+
+  /** Get the expiresAt from the response. */
+  public Timestamp getExpiresAt() {
+    return expiresAt;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/plan/Plan.java b/src/main/java/com/chargebee/v4/models/plan/Plan.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/plan/Plan.java
rename to src/main/java/com/chargebee/v4/models/plan/Plan.java
index 9ac59dfe..e309f21f 100644
--- a/src/main/java/com/chargebee/v4/core/models/plan/Plan.java
+++ b/src/main/java/com/chargebee/v4/models/plan/Plan.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.plan;
+package com.chargebee.v4.models.plan;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -70,7 +70,7 @@ public class Plan {
   private List<AttachedAddons> attachedAddons;
   private List<EventBasedAddons> eventBasedAddons;
 
-  private java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+  private java.util.Map<String, String> customFields = new java.util.HashMap<>();
 
   public String getId() {
     return id;
@@ -304,7 +304,7 @@ public List<EventBasedAddons> getEventBasedAddons() {
    *
    * @return map containing all custom fields
    */
-  public java.util.Map<String, Object> getCustomFields() {
+  public java.util.Map<String, String> getCustomFields() {
     return customFields;
   }
 
@@ -314,7 +314,7 @@ public java.util.Map<String, Object> getCustomFields() {
    * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
    * @return the value of the custom field, or null if not present
    */
-  public Object getCustomField(String fieldName) {
+  public String getCustomField(String fieldName) {
     return customFields.get(fieldName);
   }
 
@@ -634,7 +634,7 @@ public static Channel fromString(String value) {
   public static Plan fromJson(String json) {
     Plan obj = new Plan();
 
-    // Parse JSON to extract all keys
+    // Parse JSON to extract all keys for custom field extraction
     java.util.Set<String> knownFields = new java.util.HashSet<>();
 
     knownFields.add("id");
@@ -897,9 +897,9 @@ public static Plan fromJson(String json) {
    * @param knownFields set of known field names
    * @return map of custom fields
    */
-  private static java.util.Map<String, Object> extractCustomFields(
+  private static java.util.Map<String, String> extractCustomFields(
       String json, java.util.Set<String> knownFields) {
-    java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+    java.util.Map<String, String> customFields = new java.util.HashMap<>();
     try {
       // Parse the entire JSON as a map
       java.util.Map<String, Object> allFields = JsonUtil.parseJsonObjectToMap(json);
@@ -908,7 +908,8 @@ private static java.util.Map<String, Object> extractCustomFields(
           String key = entry.getKey();
           // Include fields that start with "cf_" and are not in knownFields
           if (key != null && key.startsWith("cf_") && !knownFields.contains(key)) {
-            customFields.put(key, entry.getValue());
+            customFields.put(
+                key, entry.getValue() != null ? String.valueOf(entry.getValue()) : null);
           }
         }
       }
diff --git a/src/main/java/com/chargebee/v4/models/plan/params/PlanCopyParams.java b/src/main/java/com/chargebee/v4/models/plan/params/PlanCopyParams.java
new file mode 100644
index 00000000..dc9218d4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/plan/params/PlanCopyParams.java
@@ -0,0 +1,120 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.plan.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PlanCopyParams {
+
+  private final String fromSite;
+
+  private final String idAtFromSite;
+
+  private final String id;
+
+  private final Boolean forSiteMerging;
+
+  private PlanCopyParams(PlanCopyBuilder builder) {
+
+    this.fromSite = builder.fromSite;
+
+    this.idAtFromSite = builder.idAtFromSite;
+
+    this.id = builder.id;
+
+    this.forSiteMerging = builder.forSiteMerging;
+  }
+
+  public String getFromSite() {
+    return fromSite;
+  }
+
+  public String getIdAtFromSite() {
+    return idAtFromSite;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public Boolean getForSiteMerging() {
+    return forSiteMerging;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.fromSite != null) {
+
+      formData.put("from_site", this.fromSite);
+    }
+
+    if (this.idAtFromSite != null) {
+
+      formData.put("id_at_from_site", this.idAtFromSite);
+    }
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.forSiteMerging != null) {
+
+      formData.put("for_site_merging", this.forSiteMerging);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PlanCopyParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PlanCopyBuilder builder() {
+    return new PlanCopyBuilder();
+  }
+
+  public static final class PlanCopyBuilder {
+
+    private String fromSite;
+
+    private String idAtFromSite;
+
+    private String id;
+
+    private Boolean forSiteMerging;
+
+    private PlanCopyBuilder() {}
+
+    public PlanCopyBuilder fromSite(String value) {
+      this.fromSite = value;
+      return this;
+    }
+
+    public PlanCopyBuilder idAtFromSite(String value) {
+      this.idAtFromSite = value;
+      return this;
+    }
+
+    public PlanCopyBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public PlanCopyBuilder forSiteMerging(Boolean value) {
+      this.forSiteMerging = value;
+      return this;
+    }
+
+    public PlanCopyParams build() {
+      return new PlanCopyParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/plan/params/PlanCreateParams.java b/src/main/java/com/chargebee/v4/models/plan/params/PlanCreateParams.java
new file mode 100644
index 00000000..5a2486f6
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/plan/params/PlanCreateParams.java
@@ -0,0 +1,2069 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.plan.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class PlanCreateParams {
+
+  private final String id;
+
+  private final String name;
+
+  private final String invoiceName;
+
+  private final String description;
+
+  private final Integer trialPeriod;
+
+  private final TrialPeriodUnit trialPeriodUnit;
+
+  private final TrialEndAction trialEndAction;
+
+  private final Integer period;
+
+  private final PeriodUnit periodUnit;
+
+  private final Long setupCost;
+
+  private final Long price;
+
+  private final String priceInDecimal;
+
+  private final String currencyCode;
+
+  private final Integer billingCycles;
+
+  private final PricingModel pricingModel;
+
+  private final ChargeModel chargeModel;
+
+  private final Integer freeQuantity;
+
+  private final String freeQuantityInDecimal;
+
+  private final AddonApplicability addonApplicability;
+
+  private final Number downgradePenalty;
+
+  private final String redirectUrl;
+
+  private final Boolean enabledInHostedPages;
+
+  private final Boolean enabledInPortal;
+
+  private final Boolean taxable;
+
+  private final String taxProfileId;
+
+  private final String taxCode;
+
+  private final String hsnCode;
+
+  private final String taxjarProductCode;
+
+  private final AvalaraSaleType avalaraSaleType;
+
+  private final Integer avalaraTransactionType;
+
+  private final Integer avalaraServiceType;
+
+  private final String sku;
+
+  private final String accountingCode;
+
+  private final String accountingCategory1;
+
+  private final String accountingCategory2;
+
+  private final String accountingCategory3;
+
+  private final String accountingCategory4;
+
+  private final Boolean isShippable;
+
+  private final Integer shippingFrequencyPeriod;
+
+  private final ShippingFrequencyPeriodUnit shippingFrequencyPeriodUnit;
+
+  private final String invoiceNotes;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final Boolean showDescriptionInInvoices;
+
+  private final Boolean showDescriptionInQuotes;
+
+  private final Boolean giftable;
+
+  private final Status status;
+
+  private final String claimUrl;
+
+  private final List<TiersParams> tiers;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private final List<ApplicableAddonsParams> applicableAddons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private final List<AttachedAddonsParams> attachedAddons;
+
+  private final Map<String, String> customFields;
+
+  private PlanCreateParams(PlanCreateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.name = builder.name;
+
+    this.invoiceName = builder.invoiceName;
+
+    this.description = builder.description;
+
+    this.trialPeriod = builder.trialPeriod;
+
+    this.trialPeriodUnit = builder.trialPeriodUnit;
+
+    this.trialEndAction = builder.trialEndAction;
+
+    this.period = builder.period;
+
+    this.periodUnit = builder.periodUnit;
+
+    this.setupCost = builder.setupCost;
+
+    this.price = builder.price;
+
+    this.priceInDecimal = builder.priceInDecimal;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.pricingModel = builder.pricingModel;
+
+    this.chargeModel = builder.chargeModel;
+
+    this.freeQuantity = builder.freeQuantity;
+
+    this.freeQuantityInDecimal = builder.freeQuantityInDecimal;
+
+    this.addonApplicability = builder.addonApplicability;
+
+    this.downgradePenalty = builder.downgradePenalty;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.enabledInHostedPages = builder.enabledInHostedPages;
+
+    this.enabledInPortal = builder.enabledInPortal;
+
+    this.taxable = builder.taxable;
+
+    this.taxProfileId = builder.taxProfileId;
+
+    this.taxCode = builder.taxCode;
+
+    this.hsnCode = builder.hsnCode;
+
+    this.taxjarProductCode = builder.taxjarProductCode;
+
+    this.avalaraSaleType = builder.avalaraSaleType;
+
+    this.avalaraTransactionType = builder.avalaraTransactionType;
+
+    this.avalaraServiceType = builder.avalaraServiceType;
+
+    this.sku = builder.sku;
+
+    this.accountingCode = builder.accountingCode;
+
+    this.accountingCategory1 = builder.accountingCategory1;
+
+    this.accountingCategory2 = builder.accountingCategory2;
+
+    this.accountingCategory3 = builder.accountingCategory3;
+
+    this.accountingCategory4 = builder.accountingCategory4;
+
+    this.isShippable = builder.isShippable;
+
+    this.shippingFrequencyPeriod = builder.shippingFrequencyPeriod;
+
+    this.shippingFrequencyPeriodUnit = builder.shippingFrequencyPeriodUnit;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.metaData = builder.metaData;
+
+    this.showDescriptionInInvoices = builder.showDescriptionInInvoices;
+
+    this.showDescriptionInQuotes = builder.showDescriptionInQuotes;
+
+    this.giftable = builder.giftable;
+
+    this.status = builder.status;
+
+    this.claimUrl = builder.claimUrl;
+
+    this.tiers = builder.tiers;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+
+    this.applicableAddons = builder.applicableAddons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+
+    this.attachedAddons = builder.attachedAddons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getInvoiceName() {
+    return invoiceName;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public Integer getTrialPeriod() {
+    return trialPeriod;
+  }
+
+  public TrialPeriodUnit getTrialPeriodUnit() {
+    return trialPeriodUnit;
+  }
+
+  public TrialEndAction getTrialEndAction() {
+    return trialEndAction;
+  }
+
+  public Integer getPeriod() {
+    return period;
+  }
+
+  public PeriodUnit getPeriodUnit() {
+    return periodUnit;
+  }
+
+  public Long getSetupCost() {
+    return setupCost;
+  }
+
+  public Long getPrice() {
+    return price;
+  }
+
+  public String getPriceInDecimal() {
+    return priceInDecimal;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public PricingModel getPricingModel() {
+    return pricingModel;
+  }
+
+  public ChargeModel getChargeModel() {
+    return chargeModel;
+  }
+
+  public Integer getFreeQuantity() {
+    return freeQuantity;
+  }
+
+  public String getFreeQuantityInDecimal() {
+    return freeQuantityInDecimal;
+  }
+
+  public AddonApplicability getAddonApplicability() {
+    return addonApplicability;
+  }
+
+  public Number getDowngradePenalty() {
+    return downgradePenalty;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public Boolean getEnabledInHostedPages() {
+    return enabledInHostedPages;
+  }
+
+  public Boolean getEnabledInPortal() {
+    return enabledInPortal;
+  }
+
+  public Boolean getTaxable() {
+    return taxable;
+  }
+
+  public String getTaxProfileId() {
+    return taxProfileId;
+  }
+
+  public String getTaxCode() {
+    return taxCode;
+  }
+
+  public String getHsnCode() {
+    return hsnCode;
+  }
+
+  public String getTaxjarProductCode() {
+    return taxjarProductCode;
+  }
+
+  public AvalaraSaleType getAvalaraSaleType() {
+    return avalaraSaleType;
+  }
+
+  public Integer getAvalaraTransactionType() {
+    return avalaraTransactionType;
+  }
+
+  public Integer getAvalaraServiceType() {
+    return avalaraServiceType;
+  }
+
+  public String getSku() {
+    return sku;
+  }
+
+  public String getAccountingCode() {
+    return accountingCode;
+  }
+
+  public String getAccountingCategory1() {
+    return accountingCategory1;
+  }
+
+  public String getAccountingCategory2() {
+    return accountingCategory2;
+  }
+
+  public String getAccountingCategory3() {
+    return accountingCategory3;
+  }
+
+  public String getAccountingCategory4() {
+    return accountingCategory4;
+  }
+
+  public Boolean getIsShippable() {
+    return isShippable;
+  }
+
+  public Integer getShippingFrequencyPeriod() {
+    return shippingFrequencyPeriod;
+  }
+
+  public ShippingFrequencyPeriodUnit getShippingFrequencyPeriodUnit() {
+    return shippingFrequencyPeriodUnit;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public Boolean getShowDescriptionInInvoices() {
+    return showDescriptionInInvoices;
+  }
+
+  public Boolean getShowDescriptionInQuotes() {
+    return showDescriptionInQuotes;
+  }
+
+  public Boolean getGiftable() {
+    return giftable;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public String getClaimUrl() {
+    return claimUrl;
+  }
+
+  public List<TiersParams> getTiers() {
+    return tiers;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  public List<ApplicableAddonsParams> getApplicableAddons() {
+    return applicableAddons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  public List<AttachedAddonsParams> getAttachedAddons() {
+    return attachedAddons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.invoiceName != null) {
+
+      formData.put("invoice_name", this.invoiceName);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.trialPeriod != null) {
+
+      formData.put("trial_period", this.trialPeriod);
+    }
+
+    if (this.trialPeriodUnit != null) {
+
+      formData.put("trial_period_unit", this.trialPeriodUnit);
+    }
+
+    if (this.trialEndAction != null) {
+
+      formData.put("trial_end_action", this.trialEndAction);
+    }
+
+    if (this.period != null) {
+
+      formData.put("period", this.period);
+    }
+
+    if (this.periodUnit != null) {
+
+      formData.put("period_unit", this.periodUnit);
+    }
+
+    if (this.setupCost != null) {
+
+      formData.put("setup_cost", this.setupCost);
+    }
+
+    if (this.price != null) {
+
+      formData.put("price", this.price);
+    }
+
+    if (this.priceInDecimal != null) {
+
+      formData.put("price_in_decimal", this.priceInDecimal);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.pricingModel != null) {
+
+      formData.put("pricing_model", this.pricingModel);
+    }
+
+    if (this.chargeModel != null) {
+
+      formData.put("charge_model", this.chargeModel);
+    }
+
+    if (this.freeQuantity != null) {
+
+      formData.put("free_quantity", this.freeQuantity);
+    }
+
+    if (this.freeQuantityInDecimal != null) {
+
+      formData.put("free_quantity_in_decimal", this.freeQuantityInDecimal);
+    }
+
+    if (this.addonApplicability != null) {
+
+      formData.put("addon_applicability", this.addonApplicability);
+    }
+
+    if (this.downgradePenalty != null) {
+
+      formData.put("downgrade_penalty", this.downgradePenalty);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.enabledInHostedPages != null) {
+
+      formData.put("enabled_in_hosted_pages", this.enabledInHostedPages);
+    }
+
+    if (this.enabledInPortal != null) {
+
+      formData.put("enabled_in_portal", this.enabledInPortal);
+    }
+
+    if (this.taxable != null) {
+
+      formData.put("taxable", this.taxable);
+    }
+
+    if (this.taxProfileId != null) {
+
+      formData.put("tax_profile_id", this.taxProfileId);
+    }
+
+    if (this.taxCode != null) {
+
+      formData.put("tax_code", this.taxCode);
+    }
+
+    if (this.hsnCode != null) {
+
+      formData.put("hsn_code", this.hsnCode);
+    }
+
+    if (this.taxjarProductCode != null) {
+
+      formData.put("taxjar_product_code", this.taxjarProductCode);
+    }
+
+    if (this.avalaraSaleType != null) {
+
+      formData.put("avalara_sale_type", this.avalaraSaleType);
+    }
+
+    if (this.avalaraTransactionType != null) {
+
+      formData.put("avalara_transaction_type", this.avalaraTransactionType);
+    }
+
+    if (this.avalaraServiceType != null) {
+
+      formData.put("avalara_service_type", this.avalaraServiceType);
+    }
+
+    if (this.sku != null) {
+
+      formData.put("sku", this.sku);
+    }
+
+    if (this.accountingCode != null) {
+
+      formData.put("accounting_code", this.accountingCode);
+    }
+
+    if (this.accountingCategory1 != null) {
+
+      formData.put("accounting_category1", this.accountingCategory1);
+    }
+
+    if (this.accountingCategory2 != null) {
+
+      formData.put("accounting_category2", this.accountingCategory2);
+    }
+
+    if (this.accountingCategory3 != null) {
+
+      formData.put("accounting_category3", this.accountingCategory3);
+    }
+
+    if (this.accountingCategory4 != null) {
+
+      formData.put("accounting_category4", this.accountingCategory4);
+    }
+
+    if (this.isShippable != null) {
+
+      formData.put("is_shippable", this.isShippable);
+    }
+
+    if (this.shippingFrequencyPeriod != null) {
+
+      formData.put("shipping_frequency_period", this.shippingFrequencyPeriod);
+    }
+
+    if (this.shippingFrequencyPeriodUnit != null) {
+
+      formData.put("shipping_frequency_period_unit", this.shippingFrequencyPeriodUnit);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.showDescriptionInInvoices != null) {
+
+      formData.put("show_description_in_invoices", this.showDescriptionInInvoices);
+    }
+
+    if (this.showDescriptionInQuotes != null) {
+
+      formData.put("show_description_in_quotes", this.showDescriptionInQuotes);
+    }
+
+    if (this.giftable != null) {
+
+      formData.put("giftable", this.giftable);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.claimUrl != null) {
+
+      formData.put("claim_url", this.claimUrl);
+    }
+
+    if (this.tiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.tiers.size(); i++) {
+        TiersParams item = this.tiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.applicableAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.applicableAddons.size(); i++) {
+        ApplicableAddonsParams item = this.applicableAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "applicable_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.attachedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.attachedAddons.size(); i++) {
+        AttachedAddonsParams item = this.attachedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "attached_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for PlanCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PlanCreateBuilder builder() {
+    return new PlanCreateBuilder();
+  }
+
+  public static final class PlanCreateBuilder {
+
+    private String id;
+
+    private String name;
+
+    private String invoiceName;
+
+    private String description;
+
+    private Integer trialPeriod;
+
+    private TrialPeriodUnit trialPeriodUnit;
+
+    private TrialEndAction trialEndAction;
+
+    private Integer period;
+
+    private PeriodUnit periodUnit;
+
+    private Long setupCost;
+
+    private Long price;
+
+    private String priceInDecimal;
+
+    private String currencyCode;
+
+    private Integer billingCycles;
+
+    private PricingModel pricingModel;
+
+    private ChargeModel chargeModel;
+
+    private Integer freeQuantity;
+
+    private String freeQuantityInDecimal;
+
+    private AddonApplicability addonApplicability;
+
+    private Number downgradePenalty;
+
+    private String redirectUrl;
+
+    private Boolean enabledInHostedPages;
+
+    private Boolean enabledInPortal;
+
+    private Boolean taxable;
+
+    private String taxProfileId;
+
+    private String taxCode;
+
+    private String hsnCode;
+
+    private String taxjarProductCode;
+
+    private AvalaraSaleType avalaraSaleType;
+
+    private Integer avalaraTransactionType;
+
+    private Integer avalaraServiceType;
+
+    private String sku;
+
+    private String accountingCode;
+
+    private String accountingCategory1;
+
+    private String accountingCategory2;
+
+    private String accountingCategory3;
+
+    private String accountingCategory4;
+
+    private Boolean isShippable;
+
+    private Integer shippingFrequencyPeriod;
+
+    private ShippingFrequencyPeriodUnit shippingFrequencyPeriodUnit;
+
+    private String invoiceNotes;
+
+    private java.util.Map<String, Object> metaData;
+
+    private Boolean showDescriptionInInvoices;
+
+    private Boolean showDescriptionInQuotes;
+
+    private Boolean giftable;
+
+    private Status status;
+
+    private String claimUrl;
+
+    private List<TiersParams> tiers;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private List<ApplicableAddonsParams> applicableAddons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private List<AttachedAddonsParams> attachedAddons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private PlanCreateBuilder() {}
+
+    public PlanCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public PlanCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public PlanCreateBuilder invoiceName(String value) {
+      this.invoiceName = value;
+      return this;
+    }
+
+    public PlanCreateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public PlanCreateBuilder trialPeriod(Integer value) {
+      this.trialPeriod = value;
+      return this;
+    }
+
+    public PlanCreateBuilder trialPeriodUnit(TrialPeriodUnit value) {
+      this.trialPeriodUnit = value;
+      return this;
+    }
+
+    public PlanCreateBuilder trialEndAction(TrialEndAction value) {
+      this.trialEndAction = value;
+      return this;
+    }
+
+    public PlanCreateBuilder period(Integer value) {
+      this.period = value;
+      return this;
+    }
+
+    public PlanCreateBuilder periodUnit(PeriodUnit value) {
+      this.periodUnit = value;
+      return this;
+    }
+
+    public PlanCreateBuilder setupCost(Long value) {
+      this.setupCost = value;
+      return this;
+    }
+
+    public PlanCreateBuilder price(Long value) {
+      this.price = value;
+      return this;
+    }
+
+    public PlanCreateBuilder priceInDecimal(String value) {
+      this.priceInDecimal = value;
+      return this;
+    }
+
+    public PlanCreateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public PlanCreateBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public PlanCreateBuilder pricingModel(PricingModel value) {
+      this.pricingModel = value;
+      return this;
+    }
+
+    @Deprecated
+    public PlanCreateBuilder chargeModel(ChargeModel value) {
+      this.chargeModel = value;
+      return this;
+    }
+
+    public PlanCreateBuilder freeQuantity(Integer value) {
+      this.freeQuantity = value;
+      return this;
+    }
+
+    public PlanCreateBuilder freeQuantityInDecimal(String value) {
+      this.freeQuantityInDecimal = value;
+      return this;
+    }
+
+    public PlanCreateBuilder addonApplicability(AddonApplicability value) {
+      this.addonApplicability = value;
+      return this;
+    }
+
+    @Deprecated
+    public PlanCreateBuilder downgradePenalty(Number value) {
+      this.downgradePenalty = value;
+      return this;
+    }
+
+    public PlanCreateBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public PlanCreateBuilder enabledInHostedPages(Boolean value) {
+      this.enabledInHostedPages = value;
+      return this;
+    }
+
+    public PlanCreateBuilder enabledInPortal(Boolean value) {
+      this.enabledInPortal = value;
+      return this;
+    }
+
+    public PlanCreateBuilder taxable(Boolean value) {
+      this.taxable = value;
+      return this;
+    }
+
+    public PlanCreateBuilder taxProfileId(String value) {
+      this.taxProfileId = value;
+      return this;
+    }
+
+    public PlanCreateBuilder taxCode(String value) {
+      this.taxCode = value;
+      return this;
+    }
+
+    public PlanCreateBuilder hsnCode(String value) {
+      this.hsnCode = value;
+      return this;
+    }
+
+    public PlanCreateBuilder taxjarProductCode(String value) {
+      this.taxjarProductCode = value;
+      return this;
+    }
+
+    public PlanCreateBuilder avalaraSaleType(AvalaraSaleType value) {
+      this.avalaraSaleType = value;
+      return this;
+    }
+
+    public PlanCreateBuilder avalaraTransactionType(Integer value) {
+      this.avalaraTransactionType = value;
+      return this;
+    }
+
+    public PlanCreateBuilder avalaraServiceType(Integer value) {
+      this.avalaraServiceType = value;
+      return this;
+    }
+
+    public PlanCreateBuilder sku(String value) {
+      this.sku = value;
+      return this;
+    }
+
+    public PlanCreateBuilder accountingCode(String value) {
+      this.accountingCode = value;
+      return this;
+    }
+
+    public PlanCreateBuilder accountingCategory1(String value) {
+      this.accountingCategory1 = value;
+      return this;
+    }
+
+    public PlanCreateBuilder accountingCategory2(String value) {
+      this.accountingCategory2 = value;
+      return this;
+    }
+
+    public PlanCreateBuilder accountingCategory3(String value) {
+      this.accountingCategory3 = value;
+      return this;
+    }
+
+    public PlanCreateBuilder accountingCategory4(String value) {
+      this.accountingCategory4 = value;
+      return this;
+    }
+
+    public PlanCreateBuilder isShippable(Boolean value) {
+      this.isShippable = value;
+      return this;
+    }
+
+    public PlanCreateBuilder shippingFrequencyPeriod(Integer value) {
+      this.shippingFrequencyPeriod = value;
+      return this;
+    }
+
+    public PlanCreateBuilder shippingFrequencyPeriodUnit(ShippingFrequencyPeriodUnit value) {
+      this.shippingFrequencyPeriodUnit = value;
+      return this;
+    }
+
+    public PlanCreateBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public PlanCreateBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public PlanCreateBuilder showDescriptionInInvoices(Boolean value) {
+      this.showDescriptionInInvoices = value;
+      return this;
+    }
+
+    public PlanCreateBuilder showDescriptionInQuotes(Boolean value) {
+      this.showDescriptionInQuotes = value;
+      return this;
+    }
+
+    public PlanCreateBuilder giftable(Boolean value) {
+      this.giftable = value;
+      return this;
+    }
+
+    public PlanCreateBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public PlanCreateBuilder claimUrl(String value) {
+      this.claimUrl = value;
+      return this;
+    }
+
+    public PlanCreateBuilder tiers(List<TiersParams> value) {
+      this.tiers = value;
+      return this;
+    }
+
+    public PlanCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public PlanCreateBuilder applicableAddons(List<ApplicableAddonsParams> value) {
+      this.applicableAddons = value;
+      return this;
+    }
+
+    public PlanCreateBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public PlanCreateBuilder attachedAddons(List<AttachedAddonsParams> value) {
+      this.attachedAddons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public PlanCreateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public PlanCreateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public PlanCreateParams build() {
+      return new PlanCreateParams(this);
+    }
+  }
+
+  public enum TrialPeriodUnit {
+    DAY("day"),
+
+    MONTH("month"),
+
+    /** An enum member indicating that TrialPeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TrialPeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TrialPeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TrialPeriodUnit enumValue : TrialPeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TrialEndAction {
+    SITE_DEFAULT("site_default"),
+
+    ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+    CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TrialEndAction(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TrialEndAction fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TrialEndAction enumValue : TrialEndAction.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PeriodUnit enumValue : PeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PricingModel {
+    FLAT_FEE("flat_fee"),
+
+    PER_UNIT("per_unit"),
+
+    TIERED("tiered"),
+
+    VOLUME("volume"),
+
+    STAIRSTEP("stairstep"),
+
+    /** An enum member indicating that PricingModel was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PricingModel(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PricingModel fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PricingModel enumValue : PricingModel.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChargeModel {
+    FLAT_FEE("flat_fee"),
+
+    PER_UNIT("per_unit"),
+
+    TIERED("tiered"),
+
+    VOLUME("volume"),
+
+    STAIRSTEP("stairstep"),
+
+    /** An enum member indicating that ChargeModel was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChargeModel(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChargeModel fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChargeModel enumValue : ChargeModel.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AddonApplicability {
+    ALL("all"),
+
+    RESTRICTED("restricted"),
+
+    /** An enum member indicating that AddonApplicability was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AddonApplicability(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AddonApplicability fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AddonApplicability enumValue : AddonApplicability.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AvalaraSaleType {
+    WHOLESALE("wholesale"),
+
+    RETAIL("retail"),
+
+    CONSUMED("consumed"),
+
+    VENDOR_USE("vendor_use"),
+
+    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AvalaraSaleType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AvalaraSaleType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ShippingFrequencyPeriodUnit {
+    YEAR("year"),
+
+    MONTH("month"),
+
+    WEEK("week"),
+
+    DAY("day"),
+
+    /**
+     * An enum member indicating that ShippingFrequencyPeriodUnit was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    ShippingFrequencyPeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ShippingFrequencyPeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ShippingFrequencyPeriodUnit enumValue : ShippingFrequencyPeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Status {
+    ACTIVE("active"),
+
+    ARCHIVED("archived"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class TiersParams {
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private TiersParams(TiersBuilder builder) {
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TiersBuilder builder() {
+      return new TiersBuilder();
+    }
+
+    public static final class TiersBuilder {
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private TiersBuilder() {}
+
+      public TiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public TiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public TiersParams build() {
+        return new TiersParams(this);
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+
+  public static final class ApplicableAddonsParams {
+
+    private final String id;
+
+    private ApplicableAddonsParams(ApplicableAddonsBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ApplicableAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ApplicableAddonsBuilder builder() {
+      return new ApplicableAddonsBuilder();
+    }
+
+    public static final class ApplicableAddonsBuilder {
+
+      private String id;
+
+      private ApplicableAddonsBuilder() {}
+
+      public ApplicableAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public ApplicableAddonsParams build() {
+        return new ApplicableAddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AttachedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Type type;
+
+    private AttachedAddonsParams(AttachedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.type = builder.type;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AttachedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AttachedAddonsBuilder builder() {
+      return new AttachedAddonsBuilder();
+    }
+
+    public static final class AttachedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Integer billingCycles;
+
+      private Type type;
+
+      private AttachedAddonsBuilder() {}
+
+      public AttachedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AttachedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AttachedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AttachedAddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AttachedAddonsBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      public AttachedAddonsParams build() {
+        return new AttachedAddonsParams(this);
+      }
+    }
+
+    public enum Type {
+      RECOMMENDED("recommended"),
+
+      MANDATORY("mandatory"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/plan/params/PlanDeleteParams.java b/src/main/java/com/chargebee/v4/models/plan/params/PlanDeleteParams.java
new file mode 100644
index 00000000..e2ae1078
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/plan/params/PlanDeleteParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.plan.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PlanDeleteParams {
+
+  private PlanDeleteParams(PlanDeleteBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for PlanDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PlanDeleteBuilder builder() {
+    return new PlanDeleteBuilder();
+  }
+
+  public static final class PlanDeleteBuilder {
+
+    private PlanDeleteBuilder() {}
+
+    public PlanDeleteParams build() {
+      return new PlanDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanListParams.java b/src/main/java/com/chargebee/v4/models/plan/params/PlanListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/plan/params/PlanListParams.java
rename to src/main/java/com/chargebee/v4/models/plan/params/PlanListParams.java
index df8c5bb4..8b7fc77d 100644
--- a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanListParams.java
+++ b/src/main/java/com/chargebee/v4/models/plan/params/PlanListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.plan.params;
+package com.chargebee.v4.models.plan.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanRetrieveParams.java b/src/main/java/com/chargebee/v4/models/plan/params/PlanRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/plan/params/PlanRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/plan/params/PlanRetrieveParams.java
index 568bffe5..68d6b85a 100644
--- a/src/main/java/com/chargebee/v4/core/models/plan/params/PlanRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/plan/params/PlanRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.plan.params;
+package com.chargebee.v4.models.plan.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/plan/params/PlanUnarchiveParams.java b/src/main/java/com/chargebee/v4/models/plan/params/PlanUnarchiveParams.java
new file mode 100644
index 00000000..11f7724b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/plan/params/PlanUnarchiveParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.plan.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PlanUnarchiveParams {
+
+  private PlanUnarchiveParams(PlanUnarchiveBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for PlanUnarchiveParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PlanUnarchiveBuilder builder() {
+    return new PlanUnarchiveBuilder();
+  }
+
+  public static final class PlanUnarchiveBuilder {
+
+    private PlanUnarchiveBuilder() {}
+
+    public PlanUnarchiveParams build() {
+      return new PlanUnarchiveParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/plan/params/PlanUpdateParams.java b/src/main/java/com/chargebee/v4/models/plan/params/PlanUpdateParams.java
new file mode 100644
index 00000000..4a2e1083
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/plan/params/PlanUpdateParams.java
@@ -0,0 +1,1961 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.plan.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class PlanUpdateParams {
+
+  private final String name;
+
+  private final String invoiceName;
+
+  private final String description;
+
+  private final Integer trialPeriod;
+
+  private final TrialPeriodUnit trialPeriodUnit;
+
+  private final TrialEndAction trialEndAction;
+
+  private final Integer period;
+
+  private final PeriodUnit periodUnit;
+
+  private final Long setupCost;
+
+  private final Long price;
+
+  private final String priceInDecimal;
+
+  private final String currencyCode;
+
+  private final Integer billingCycles;
+
+  private final PricingModel pricingModel;
+
+  private final ChargeModel chargeModel;
+
+  private final Integer freeQuantity;
+
+  private final String freeQuantityInDecimal;
+
+  private final AddonApplicability addonApplicability;
+
+  private final Number downgradePenalty;
+
+  private final String redirectUrl;
+
+  private final Boolean enabledInHostedPages;
+
+  private final Boolean enabledInPortal;
+
+  private final Boolean taxable;
+
+  private final String taxProfileId;
+
+  private final String taxCode;
+
+  private final String hsnCode;
+
+  private final String taxjarProductCode;
+
+  private final AvalaraSaleType avalaraSaleType;
+
+  private final Integer avalaraTransactionType;
+
+  private final Integer avalaraServiceType;
+
+  private final String sku;
+
+  private final String accountingCode;
+
+  private final String accountingCategory1;
+
+  private final String accountingCategory2;
+
+  private final String accountingCategory3;
+
+  private final String accountingCategory4;
+
+  private final Boolean isShippable;
+
+  private final Integer shippingFrequencyPeriod;
+
+  private final ShippingFrequencyPeriodUnit shippingFrequencyPeriodUnit;
+
+  private final String invoiceNotes;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final Boolean showDescriptionInInvoices;
+
+  private final Boolean showDescriptionInQuotes;
+
+  private final List<TiersParams> tiers;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private final List<ApplicableAddonsParams> applicableAddons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private final List<AttachedAddonsParams> attachedAddons;
+
+  private final Map<String, String> customFields;
+
+  private PlanUpdateParams(PlanUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.invoiceName = builder.invoiceName;
+
+    this.description = builder.description;
+
+    this.trialPeriod = builder.trialPeriod;
+
+    this.trialPeriodUnit = builder.trialPeriodUnit;
+
+    this.trialEndAction = builder.trialEndAction;
+
+    this.period = builder.period;
+
+    this.periodUnit = builder.periodUnit;
+
+    this.setupCost = builder.setupCost;
+
+    this.price = builder.price;
+
+    this.priceInDecimal = builder.priceInDecimal;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.pricingModel = builder.pricingModel;
+
+    this.chargeModel = builder.chargeModel;
+
+    this.freeQuantity = builder.freeQuantity;
+
+    this.freeQuantityInDecimal = builder.freeQuantityInDecimal;
+
+    this.addonApplicability = builder.addonApplicability;
+
+    this.downgradePenalty = builder.downgradePenalty;
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.enabledInHostedPages = builder.enabledInHostedPages;
+
+    this.enabledInPortal = builder.enabledInPortal;
+
+    this.taxable = builder.taxable;
+
+    this.taxProfileId = builder.taxProfileId;
+
+    this.taxCode = builder.taxCode;
+
+    this.hsnCode = builder.hsnCode;
+
+    this.taxjarProductCode = builder.taxjarProductCode;
+
+    this.avalaraSaleType = builder.avalaraSaleType;
+
+    this.avalaraTransactionType = builder.avalaraTransactionType;
+
+    this.avalaraServiceType = builder.avalaraServiceType;
+
+    this.sku = builder.sku;
+
+    this.accountingCode = builder.accountingCode;
+
+    this.accountingCategory1 = builder.accountingCategory1;
+
+    this.accountingCategory2 = builder.accountingCategory2;
+
+    this.accountingCategory3 = builder.accountingCategory3;
+
+    this.accountingCategory4 = builder.accountingCategory4;
+
+    this.isShippable = builder.isShippable;
+
+    this.shippingFrequencyPeriod = builder.shippingFrequencyPeriod;
+
+    this.shippingFrequencyPeriodUnit = builder.shippingFrequencyPeriodUnit;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.metaData = builder.metaData;
+
+    this.showDescriptionInInvoices = builder.showDescriptionInInvoices;
+
+    this.showDescriptionInQuotes = builder.showDescriptionInQuotes;
+
+    this.tiers = builder.tiers;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+
+    this.applicableAddons = builder.applicableAddons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+
+    this.attachedAddons = builder.attachedAddons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getInvoiceName() {
+    return invoiceName;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public Integer getTrialPeriod() {
+    return trialPeriod;
+  }
+
+  public TrialPeriodUnit getTrialPeriodUnit() {
+    return trialPeriodUnit;
+  }
+
+  public TrialEndAction getTrialEndAction() {
+    return trialEndAction;
+  }
+
+  public Integer getPeriod() {
+    return period;
+  }
+
+  public PeriodUnit getPeriodUnit() {
+    return periodUnit;
+  }
+
+  public Long getSetupCost() {
+    return setupCost;
+  }
+
+  public Long getPrice() {
+    return price;
+  }
+
+  public String getPriceInDecimal() {
+    return priceInDecimal;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public PricingModel getPricingModel() {
+    return pricingModel;
+  }
+
+  public ChargeModel getChargeModel() {
+    return chargeModel;
+  }
+
+  public Integer getFreeQuantity() {
+    return freeQuantity;
+  }
+
+  public String getFreeQuantityInDecimal() {
+    return freeQuantityInDecimal;
+  }
+
+  public AddonApplicability getAddonApplicability() {
+    return addonApplicability;
+  }
+
+  public Number getDowngradePenalty() {
+    return downgradePenalty;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public Boolean getEnabledInHostedPages() {
+    return enabledInHostedPages;
+  }
+
+  public Boolean getEnabledInPortal() {
+    return enabledInPortal;
+  }
+
+  public Boolean getTaxable() {
+    return taxable;
+  }
+
+  public String getTaxProfileId() {
+    return taxProfileId;
+  }
+
+  public String getTaxCode() {
+    return taxCode;
+  }
+
+  public String getHsnCode() {
+    return hsnCode;
+  }
+
+  public String getTaxjarProductCode() {
+    return taxjarProductCode;
+  }
+
+  public AvalaraSaleType getAvalaraSaleType() {
+    return avalaraSaleType;
+  }
+
+  public Integer getAvalaraTransactionType() {
+    return avalaraTransactionType;
+  }
+
+  public Integer getAvalaraServiceType() {
+    return avalaraServiceType;
+  }
+
+  public String getSku() {
+    return sku;
+  }
+
+  public String getAccountingCode() {
+    return accountingCode;
+  }
+
+  public String getAccountingCategory1() {
+    return accountingCategory1;
+  }
+
+  public String getAccountingCategory2() {
+    return accountingCategory2;
+  }
+
+  public String getAccountingCategory3() {
+    return accountingCategory3;
+  }
+
+  public String getAccountingCategory4() {
+    return accountingCategory4;
+  }
+
+  public Boolean getIsShippable() {
+    return isShippable;
+  }
+
+  public Integer getShippingFrequencyPeriod() {
+    return shippingFrequencyPeriod;
+  }
+
+  public ShippingFrequencyPeriodUnit getShippingFrequencyPeriodUnit() {
+    return shippingFrequencyPeriodUnit;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public Boolean getShowDescriptionInInvoices() {
+    return showDescriptionInInvoices;
+  }
+
+  public Boolean getShowDescriptionInQuotes() {
+    return showDescriptionInQuotes;
+  }
+
+  public List<TiersParams> getTiers() {
+    return tiers;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  public List<ApplicableAddonsParams> getApplicableAddons() {
+    return applicableAddons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  public List<AttachedAddonsParams> getAttachedAddons() {
+    return attachedAddons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.invoiceName != null) {
+
+      formData.put("invoice_name", this.invoiceName);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.trialPeriod != null) {
+
+      formData.put("trial_period", this.trialPeriod);
+    }
+
+    if (this.trialPeriodUnit != null) {
+
+      formData.put("trial_period_unit", this.trialPeriodUnit);
+    }
+
+    if (this.trialEndAction != null) {
+
+      formData.put("trial_end_action", this.trialEndAction);
+    }
+
+    if (this.period != null) {
+
+      formData.put("period", this.period);
+    }
+
+    if (this.periodUnit != null) {
+
+      formData.put("period_unit", this.periodUnit);
+    }
+
+    if (this.setupCost != null) {
+
+      formData.put("setup_cost", this.setupCost);
+    }
+
+    if (this.price != null) {
+
+      formData.put("price", this.price);
+    }
+
+    if (this.priceInDecimal != null) {
+
+      formData.put("price_in_decimal", this.priceInDecimal);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.pricingModel != null) {
+
+      formData.put("pricing_model", this.pricingModel);
+    }
+
+    if (this.chargeModel != null) {
+
+      formData.put("charge_model", this.chargeModel);
+    }
+
+    if (this.freeQuantity != null) {
+
+      formData.put("free_quantity", this.freeQuantity);
+    }
+
+    if (this.freeQuantityInDecimal != null) {
+
+      formData.put("free_quantity_in_decimal", this.freeQuantityInDecimal);
+    }
+
+    if (this.addonApplicability != null) {
+
+      formData.put("addon_applicability", this.addonApplicability);
+    }
+
+    if (this.downgradePenalty != null) {
+
+      formData.put("downgrade_penalty", this.downgradePenalty);
+    }
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.enabledInHostedPages != null) {
+
+      formData.put("enabled_in_hosted_pages", this.enabledInHostedPages);
+    }
+
+    if (this.enabledInPortal != null) {
+
+      formData.put("enabled_in_portal", this.enabledInPortal);
+    }
+
+    if (this.taxable != null) {
+
+      formData.put("taxable", this.taxable);
+    }
+
+    if (this.taxProfileId != null) {
+
+      formData.put("tax_profile_id", this.taxProfileId);
+    }
+
+    if (this.taxCode != null) {
+
+      formData.put("tax_code", this.taxCode);
+    }
+
+    if (this.hsnCode != null) {
+
+      formData.put("hsn_code", this.hsnCode);
+    }
+
+    if (this.taxjarProductCode != null) {
+
+      formData.put("taxjar_product_code", this.taxjarProductCode);
+    }
+
+    if (this.avalaraSaleType != null) {
+
+      formData.put("avalara_sale_type", this.avalaraSaleType);
+    }
+
+    if (this.avalaraTransactionType != null) {
+
+      formData.put("avalara_transaction_type", this.avalaraTransactionType);
+    }
+
+    if (this.avalaraServiceType != null) {
+
+      formData.put("avalara_service_type", this.avalaraServiceType);
+    }
+
+    if (this.sku != null) {
+
+      formData.put("sku", this.sku);
+    }
+
+    if (this.accountingCode != null) {
+
+      formData.put("accounting_code", this.accountingCode);
+    }
+
+    if (this.accountingCategory1 != null) {
+
+      formData.put("accounting_category1", this.accountingCategory1);
+    }
+
+    if (this.accountingCategory2 != null) {
+
+      formData.put("accounting_category2", this.accountingCategory2);
+    }
+
+    if (this.accountingCategory3 != null) {
+
+      formData.put("accounting_category3", this.accountingCategory3);
+    }
+
+    if (this.accountingCategory4 != null) {
+
+      formData.put("accounting_category4", this.accountingCategory4);
+    }
+
+    if (this.isShippable != null) {
+
+      formData.put("is_shippable", this.isShippable);
+    }
+
+    if (this.shippingFrequencyPeriod != null) {
+
+      formData.put("shipping_frequency_period", this.shippingFrequencyPeriod);
+    }
+
+    if (this.shippingFrequencyPeriodUnit != null) {
+
+      formData.put("shipping_frequency_period_unit", this.shippingFrequencyPeriodUnit);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.showDescriptionInInvoices != null) {
+
+      formData.put("show_description_in_invoices", this.showDescriptionInInvoices);
+    }
+
+    if (this.showDescriptionInQuotes != null) {
+
+      formData.put("show_description_in_quotes", this.showDescriptionInQuotes);
+    }
+
+    if (this.tiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.tiers.size(); i++) {
+        TiersParams item = this.tiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.applicableAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.applicableAddons.size(); i++) {
+        ApplicableAddonsParams item = this.applicableAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "applicable_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.attachedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.attachedAddons.size(); i++) {
+        AttachedAddonsParams item = this.attachedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "attached_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for PlanUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PlanUpdateBuilder builder() {
+    return new PlanUpdateBuilder();
+  }
+
+  public static final class PlanUpdateBuilder {
+
+    private String name;
+
+    private String invoiceName;
+
+    private String description;
+
+    private Integer trialPeriod;
+
+    private TrialPeriodUnit trialPeriodUnit;
+
+    private TrialEndAction trialEndAction;
+
+    private Integer period;
+
+    private PeriodUnit periodUnit;
+
+    private Long setupCost;
+
+    private Long price;
+
+    private String priceInDecimal;
+
+    private String currencyCode;
+
+    private Integer billingCycles;
+
+    private PricingModel pricingModel;
+
+    private ChargeModel chargeModel;
+
+    private Integer freeQuantity;
+
+    private String freeQuantityInDecimal;
+
+    private AddonApplicability addonApplicability;
+
+    private Number downgradePenalty;
+
+    private String redirectUrl;
+
+    private Boolean enabledInHostedPages;
+
+    private Boolean enabledInPortal;
+
+    private Boolean taxable;
+
+    private String taxProfileId;
+
+    private String taxCode;
+
+    private String hsnCode;
+
+    private String taxjarProductCode;
+
+    private AvalaraSaleType avalaraSaleType;
+
+    private Integer avalaraTransactionType;
+
+    private Integer avalaraServiceType;
+
+    private String sku;
+
+    private String accountingCode;
+
+    private String accountingCategory1;
+
+    private String accountingCategory2;
+
+    private String accountingCategory3;
+
+    private String accountingCategory4;
+
+    private Boolean isShippable;
+
+    private Integer shippingFrequencyPeriod;
+
+    private ShippingFrequencyPeriodUnit shippingFrequencyPeriodUnit;
+
+    private String invoiceNotes;
+
+    private java.util.Map<String, Object> metaData;
+
+    private Boolean showDescriptionInInvoices;
+
+    private Boolean showDescriptionInQuotes;
+
+    private List<TiersParams> tiers;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private List<ApplicableAddonsParams> applicableAddons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private List<AttachedAddonsParams> attachedAddons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private PlanUpdateBuilder() {}
+
+    public PlanUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder invoiceName(String value) {
+      this.invoiceName = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder trialPeriod(Integer value) {
+      this.trialPeriod = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder trialPeriodUnit(TrialPeriodUnit value) {
+      this.trialPeriodUnit = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder trialEndAction(TrialEndAction value) {
+      this.trialEndAction = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder period(Integer value) {
+      this.period = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder periodUnit(PeriodUnit value) {
+      this.periodUnit = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder setupCost(Long value) {
+      this.setupCost = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder price(Long value) {
+      this.price = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder priceInDecimal(String value) {
+      this.priceInDecimal = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder pricingModel(PricingModel value) {
+      this.pricingModel = value;
+      return this;
+    }
+
+    @Deprecated
+    public PlanUpdateBuilder chargeModel(ChargeModel value) {
+      this.chargeModel = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder freeQuantity(Integer value) {
+      this.freeQuantity = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder freeQuantityInDecimal(String value) {
+      this.freeQuantityInDecimal = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder addonApplicability(AddonApplicability value) {
+      this.addonApplicability = value;
+      return this;
+    }
+
+    @Deprecated
+    public PlanUpdateBuilder downgradePenalty(Number value) {
+      this.downgradePenalty = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder enabledInHostedPages(Boolean value) {
+      this.enabledInHostedPages = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder enabledInPortal(Boolean value) {
+      this.enabledInPortal = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder taxable(Boolean value) {
+      this.taxable = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder taxProfileId(String value) {
+      this.taxProfileId = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder taxCode(String value) {
+      this.taxCode = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder hsnCode(String value) {
+      this.hsnCode = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder taxjarProductCode(String value) {
+      this.taxjarProductCode = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder avalaraSaleType(AvalaraSaleType value) {
+      this.avalaraSaleType = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder avalaraTransactionType(Integer value) {
+      this.avalaraTransactionType = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder avalaraServiceType(Integer value) {
+      this.avalaraServiceType = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder sku(String value) {
+      this.sku = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder accountingCode(String value) {
+      this.accountingCode = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder accountingCategory1(String value) {
+      this.accountingCategory1 = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder accountingCategory2(String value) {
+      this.accountingCategory2 = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder accountingCategory3(String value) {
+      this.accountingCategory3 = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder accountingCategory4(String value) {
+      this.accountingCategory4 = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder isShippable(Boolean value) {
+      this.isShippable = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder shippingFrequencyPeriod(Integer value) {
+      this.shippingFrequencyPeriod = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder shippingFrequencyPeriodUnit(ShippingFrequencyPeriodUnit value) {
+      this.shippingFrequencyPeriodUnit = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder showDescriptionInInvoices(Boolean value) {
+      this.showDescriptionInInvoices = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder showDescriptionInQuotes(Boolean value) {
+      this.showDescriptionInQuotes = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder tiers(List<TiersParams> value) {
+      this.tiers = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder applicableAddons(List<ApplicableAddonsParams> value) {
+      this.applicableAddons = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public PlanUpdateBuilder attachedAddons(List<AttachedAddonsParams> value) {
+      this.attachedAddons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public PlanUpdateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public PlanUpdateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public PlanUpdateParams build() {
+      return new PlanUpdateParams(this);
+    }
+  }
+
+  public enum TrialPeriodUnit {
+    DAY("day"),
+
+    MONTH("month"),
+
+    /** An enum member indicating that TrialPeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TrialPeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TrialPeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TrialPeriodUnit enumValue : TrialPeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TrialEndAction {
+    SITE_DEFAULT("site_default"),
+
+    ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+    CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TrialEndAction(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TrialEndAction fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TrialEndAction enumValue : TrialEndAction.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PeriodUnit enumValue : PeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PricingModel {
+    FLAT_FEE("flat_fee"),
+
+    PER_UNIT("per_unit"),
+
+    TIERED("tiered"),
+
+    VOLUME("volume"),
+
+    STAIRSTEP("stairstep"),
+
+    /** An enum member indicating that PricingModel was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PricingModel(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PricingModel fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PricingModel enumValue : PricingModel.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChargeModel {
+    FLAT_FEE("flat_fee"),
+
+    PER_UNIT("per_unit"),
+
+    TIERED("tiered"),
+
+    VOLUME("volume"),
+
+    STAIRSTEP("stairstep"),
+
+    /** An enum member indicating that ChargeModel was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChargeModel(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChargeModel fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChargeModel enumValue : ChargeModel.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AddonApplicability {
+    ALL("all"),
+
+    RESTRICTED("restricted"),
+
+    /** An enum member indicating that AddonApplicability was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AddonApplicability(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AddonApplicability fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AddonApplicability enumValue : AddonApplicability.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AvalaraSaleType {
+    WHOLESALE("wholesale"),
+
+    RETAIL("retail"),
+
+    CONSUMED("consumed"),
+
+    VENDOR_USE("vendor_use"),
+
+    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AvalaraSaleType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AvalaraSaleType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ShippingFrequencyPeriodUnit {
+    YEAR("year"),
+
+    MONTH("month"),
+
+    WEEK("week"),
+
+    DAY("day"),
+
+    /**
+     * An enum member indicating that ShippingFrequencyPeriodUnit was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    ShippingFrequencyPeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ShippingFrequencyPeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ShippingFrequencyPeriodUnit enumValue : ShippingFrequencyPeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class TiersParams {
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private TiersParams(TiersBuilder builder) {
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TiersBuilder builder() {
+      return new TiersBuilder();
+    }
+
+    public static final class TiersBuilder {
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private TiersBuilder() {}
+
+      public TiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public TiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public TiersParams build() {
+        return new TiersParams(this);
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+
+  public static final class ApplicableAddonsParams {
+
+    private final String id;
+
+    private ApplicableAddonsParams(ApplicableAddonsBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ApplicableAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ApplicableAddonsBuilder builder() {
+      return new ApplicableAddonsBuilder();
+    }
+
+    public static final class ApplicableAddonsBuilder {
+
+      private String id;
+
+      private ApplicableAddonsBuilder() {}
+
+      public ApplicableAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public ApplicableAddonsParams build() {
+        return new ApplicableAddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AttachedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Type type;
+
+    private AttachedAddonsParams(AttachedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.type = builder.type;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AttachedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AttachedAddonsBuilder builder() {
+      return new AttachedAddonsBuilder();
+    }
+
+    public static final class AttachedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Integer billingCycles;
+
+      private Type type;
+
+      private AttachedAddonsBuilder() {}
+
+      public AttachedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AttachedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AttachedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AttachedAddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AttachedAddonsBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      public AttachedAddonsParams build() {
+        return new AttachedAddonsParams(this);
+      }
+    }
+
+    public enum Type {
+      RECOMMENDED("recommended"),
+
+      MANDATORY("mandatory"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/plan/PlanCopyResponse.java b/src/main/java/com/chargebee/v4/models/plan/responses/PlanCopyResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/plan/PlanCopyResponse.java
rename to src/main/java/com/chargebee/v4/models/plan/responses/PlanCopyResponse.java
index cec4eaab..ef8f64c9 100644
--- a/src/main/java/com/chargebee/v4/core/responses/plan/PlanCopyResponse.java
+++ b/src/main/java/com/chargebee/v4/models/plan/responses/PlanCopyResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.plan;
+package com.chargebee.v4.models.plan.responses;
 
-import com.chargebee.v4.core.models.plan.Plan;
+import com.chargebee.v4.models.plan.Plan;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/plan/PlanCreateResponse.java b/src/main/java/com/chargebee/v4/models/plan/responses/PlanCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/plan/PlanCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/plan/responses/PlanCreateResponse.java
index d5bbae6c..86c2d363 100644
--- a/src/main/java/com/chargebee/v4/core/responses/plan/PlanCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/plan/responses/PlanCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.plan;
+package com.chargebee.v4.models.plan.responses;
 
-import com.chargebee.v4.core.models.plan.Plan;
+import com.chargebee.v4.models.plan.Plan;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/plan/PlanDeleteResponse.java b/src/main/java/com/chargebee/v4/models/plan/responses/PlanDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/plan/PlanDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/plan/responses/PlanDeleteResponse.java
index 6ba2b209..0aeec263 100644
--- a/src/main/java/com/chargebee/v4/core/responses/plan/PlanDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/plan/responses/PlanDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.plan;
+package com.chargebee.v4.models.plan.responses;
 
-import com.chargebee.v4.core.models.plan.Plan;
+import com.chargebee.v4.models.plan.Plan;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/plan/PlanListResponse.java b/src/main/java/com/chargebee/v4/models/plan/responses/PlanListResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/plan/PlanListResponse.java
rename to src/main/java/com/chargebee/v4/models/plan/responses/PlanListResponse.java
index 211a4ae9..293c8686 100644
--- a/src/main/java/com/chargebee/v4/core/responses/plan/PlanListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/plan/responses/PlanListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.plan;
+package com.chargebee.v4.models.plan.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.plan.Plan;
+import com.chargebee.v4.models.plan.Plan;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.PlanService;
-import com.chargebee.v4.core.models.plan.params.PlanListParams;
+import com.chargebee.v4.services.PlanService;
+import com.chargebee.v4.models.plan.params.PlanListParams;
 
 /** Immutable response object for PlanList operation. Contains paginated list data. */
 public final class PlanListResponse {
@@ -95,9 +96,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public PlanListResponse nextPage() throws Exception {
+  public PlanListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/plan/responses/PlanRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/plan/responses/PlanRetrieveResponse.java
new file mode 100644
index 00000000..68f8a7ea
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/plan/responses/PlanRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.plan.responses;
+
+import com.chargebee.v4.models.plan.Plan;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for PlanRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class PlanRetrieveResponse extends BaseResponse {
+  private final Plan plan;
+
+  private PlanRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.plan = builder.plan;
+  }
+
+  /** Parse JSON response into PlanRetrieveResponse object. */
+  public static PlanRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into PlanRetrieveResponse object with HTTP response. */
+  public static PlanRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __planJson = JsonUtil.getObject(json, "plan");
+      if (__planJson != null) {
+        builder.plan(Plan.fromJson(__planJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse PlanRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for PlanRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for PlanRetrieveResponse. */
+  public static class Builder {
+
+    private Plan plan;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder plan(Plan plan) {
+      this.plan = plan;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public PlanRetrieveResponse build() {
+      return new PlanRetrieveResponse(this);
+    }
+  }
+
+  /** Get the plan from the response. */
+  public Plan getPlan() {
+    return plan;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/plan/PlanUnarchiveResponse.java b/src/main/java/com/chargebee/v4/models/plan/responses/PlanUnarchiveResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/plan/PlanUnarchiveResponse.java
rename to src/main/java/com/chargebee/v4/models/plan/responses/PlanUnarchiveResponse.java
index 2f7fb3f7..53571a40 100644
--- a/src/main/java/com/chargebee/v4/core/responses/plan/PlanUnarchiveResponse.java
+++ b/src/main/java/com/chargebee/v4/models/plan/responses/PlanUnarchiveResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.plan;
+package com.chargebee.v4.models.plan.responses;
 
-import com.chargebee.v4.core.models.plan.Plan;
+import com.chargebee.v4.models.plan.Plan;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/plan/PlanUpdateResponse.java b/src/main/java/com/chargebee/v4/models/plan/responses/PlanUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/plan/PlanUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/plan/responses/PlanUpdateResponse.java
index 53d4b4e9..924af649 100644
--- a/src/main/java/com/chargebee/v4/core/responses/plan/PlanUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/plan/responses/PlanUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.plan;
+package com.chargebee.v4.models.plan.responses;
 
-import com.chargebee.v4.core.models.plan.Plan;
+import com.chargebee.v4.models.plan.Plan;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/portalSession/PortalSession.java b/src/main/java/com/chargebee/v4/models/portalSession/PortalSession.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/portalSession/PortalSession.java
rename to src/main/java/com/chargebee/v4/models/portalSession/PortalSession.java
index bb3efaa1..35958d6c 100644
--- a/src/main/java/com/chargebee/v4/core/models/portalSession/PortalSession.java
+++ b/src/main/java/com/chargebee/v4/models/portalSession/PortalSession.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.portalSession;
+package com.chargebee.v4.models.portalSession;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/portalSession/params/PortalSessionActivateParams.java b/src/main/java/com/chargebee/v4/models/portalSession/params/PortalSessionActivateParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/portalSession/params/PortalSessionActivateParams.java
rename to src/main/java/com/chargebee/v4/models/portalSession/params/PortalSessionActivateParams.java
index 45ca9439..49f466b1 100644
--- a/src/main/java/com/chargebee/v4/core/models/portalSession/params/PortalSessionActivateParams.java
+++ b/src/main/java/com/chargebee/v4/models/portalSession/params/PortalSessionActivateParams.java
@@ -4,24 +4,35 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.portalSession.params;
+package com.chargebee.v4.models.portalSession.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class PortalSessionActivateParams {
 
-  private final Map<String, Object> formData;
+  private final String token;
 
   private PortalSessionActivateParams(PortalSessionActivateBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
+
+    this.token = builder.token;
+  }
+
+  public String getToken() {
+    return token;
   }
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.token != null) {
+
+      formData.put("token", this.token);
+    }
+
     return formData;
   }
 
@@ -32,14 +43,13 @@ public static PortalSessionActivateBuilder builder() {
   }
 
   public static final class PortalSessionActivateBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
+
+    private String token;
 
     private PortalSessionActivateBuilder() {}
 
     public PortalSessionActivateBuilder token(String value) {
-
-      formData.put("token", value);
-
+      this.token = value;
       return this;
     }
 
diff --git a/src/main/java/com/chargebee/v4/models/portalSession/params/PortalSessionCreateParams.java b/src/main/java/com/chargebee/v4/models/portalSession/params/PortalSessionCreateParams.java
new file mode 100644
index 00000000..5937c06a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/portalSession/params/PortalSessionCreateParams.java
@@ -0,0 +1,153 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.portalSession.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PortalSessionCreateParams {
+
+  private final String redirectUrl;
+
+  private final String forwardUrl;
+
+  private final CustomerParams customer;
+
+  private PortalSessionCreateParams(PortalSessionCreateBuilder builder) {
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.forwardUrl = builder.forwardUrl;
+
+    this.customer = builder.customer;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public String getForwardUrl() {
+    return forwardUrl;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.forwardUrl != null) {
+
+      formData.put("forward_url", this.forwardUrl);
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PortalSessionCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PortalSessionCreateBuilder builder() {
+    return new PortalSessionCreateBuilder();
+  }
+
+  public static final class PortalSessionCreateBuilder {
+
+    private String redirectUrl;
+
+    private String forwardUrl;
+
+    private CustomerParams customer;
+
+    private PortalSessionCreateBuilder() {}
+
+    public PortalSessionCreateBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public PortalSessionCreateBuilder forwardUrl(String value) {
+      this.forwardUrl = value;
+      return this;
+    }
+
+    public PortalSessionCreateBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public PortalSessionCreateParams build() {
+      return new PortalSessionCreateParams(this);
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/portalSession/params/PortalSessionLogoutParams.java b/src/main/java/com/chargebee/v4/models/portalSession/params/PortalSessionLogoutParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/portalSession/params/PortalSessionLogoutParams.java
rename to src/main/java/com/chargebee/v4/models/portalSession/params/PortalSessionLogoutParams.java
index 8c0fa6f3..8e61b2e6 100644
--- a/src/main/java/com/chargebee/v4/core/models/portalSession/params/PortalSessionLogoutParams.java
+++ b/src/main/java/com/chargebee/v4/models/portalSession/params/PortalSessionLogoutParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.portalSession.params;
+package com.chargebee.v4.models.portalSession.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class PortalSessionLogoutParams {
 
-  private final Map<String, Object> formData;
-
-  private PortalSessionLogoutParams(PortalSessionLogoutBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private PortalSessionLogoutParams(PortalSessionLogoutBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static PortalSessionLogoutBuilder builder() {
   }
 
   public static final class PortalSessionLogoutBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private PortalSessionLogoutBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/portalSession/params/PortalSessionRetrieveParams.java b/src/main/java/com/chargebee/v4/models/portalSession/params/PortalSessionRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/portalSession/params/PortalSessionRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/portalSession/params/PortalSessionRetrieveParams.java
index ea3e22af..4c20abc0 100644
--- a/src/main/java/com/chargebee/v4/core/models/portalSession/params/PortalSessionRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/portalSession/params/PortalSessionRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.portalSession.params;
+package com.chargebee.v4.models.portalSession.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/portalSession/PortalSessionActivateResponse.java b/src/main/java/com/chargebee/v4/models/portalSession/responses/PortalSessionActivateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/portalSession/PortalSessionActivateResponse.java
rename to src/main/java/com/chargebee/v4/models/portalSession/responses/PortalSessionActivateResponse.java
index 210e3150..de9ba2a1 100644
--- a/src/main/java/com/chargebee/v4/core/responses/portalSession/PortalSessionActivateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/portalSession/responses/PortalSessionActivateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.portalSession;
+package com.chargebee.v4.models.portalSession.responses;
 
-import com.chargebee.v4.core.models.portalSession.PortalSession;
+import com.chargebee.v4.models.portalSession.PortalSession;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/portalSession/PortalSessionCreateResponse.java b/src/main/java/com/chargebee/v4/models/portalSession/responses/PortalSessionCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/portalSession/PortalSessionCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/portalSession/responses/PortalSessionCreateResponse.java
index c9ebd9a0..9621b09f 100644
--- a/src/main/java/com/chargebee/v4/core/responses/portalSession/PortalSessionCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/portalSession/responses/PortalSessionCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.portalSession;
+package com.chargebee.v4.models.portalSession.responses;
 
-import com.chargebee.v4.core.models.portalSession.PortalSession;
+import com.chargebee.v4.models.portalSession.PortalSession;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/portalSession/PortalSessionLogoutResponse.java b/src/main/java/com/chargebee/v4/models/portalSession/responses/PortalSessionLogoutResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/portalSession/PortalSessionLogoutResponse.java
rename to src/main/java/com/chargebee/v4/models/portalSession/responses/PortalSessionLogoutResponse.java
index e85ece65..9bf9c474 100644
--- a/src/main/java/com/chargebee/v4/core/responses/portalSession/PortalSessionLogoutResponse.java
+++ b/src/main/java/com/chargebee/v4/models/portalSession/responses/PortalSessionLogoutResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.portalSession;
+package com.chargebee.v4.models.portalSession.responses;
 
-import com.chargebee.v4.core.models.portalSession.PortalSession;
+import com.chargebee.v4.models.portalSession.PortalSession;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/portalSession/responses/PortalSessionRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/portalSession/responses/PortalSessionRetrieveResponse.java
new file mode 100644
index 00000000..e26e5b43
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/portalSession/responses/PortalSessionRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.portalSession.responses;
+
+import com.chargebee.v4.models.portalSession.PortalSession;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for PortalSessionRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class PortalSessionRetrieveResponse extends BaseResponse {
+  private final PortalSession portalSession;
+
+  private PortalSessionRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.portalSession = builder.portalSession;
+  }
+
+  /** Parse JSON response into PortalSessionRetrieveResponse object. */
+  public static PortalSessionRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into PortalSessionRetrieveResponse object with HTTP response. */
+  public static PortalSessionRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __portalSessionJson = JsonUtil.getObject(json, "portal_session");
+      if (__portalSessionJson != null) {
+        builder.portalSession(PortalSession.fromJson(__portalSessionJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse PortalSessionRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for PortalSessionRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for PortalSessionRetrieveResponse. */
+  public static class Builder {
+
+    private PortalSession portalSession;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder portalSession(PortalSession portalSession) {
+      this.portalSession = portalSession;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public PortalSessionRetrieveResponse build() {
+      return new PortalSessionRetrieveResponse(this);
+    }
+  }
+
+  /** Get the portalSession from the response. */
+  public PortalSession getPortalSession() {
+    return portalSession;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/priceVariant/PriceVariant.java b/src/main/java/com/chargebee/v4/models/priceVariant/PriceVariant.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/priceVariant/PriceVariant.java
rename to src/main/java/com/chargebee/v4/models/priceVariant/PriceVariant.java
index 984adba5..aa928918 100644
--- a/src/main/java/com/chargebee/v4/core/models/priceVariant/PriceVariant.java
+++ b/src/main/java/com/chargebee/v4/models/priceVariant/PriceVariant.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.priceVariant;
+package com.chargebee.v4.models.priceVariant;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantCreateParams.java b/src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantCreateParams.java
new file mode 100644
index 00000000..a2100343
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantCreateParams.java
@@ -0,0 +1,259 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.priceVariant.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class PriceVariantCreateParams {
+
+  private final String id;
+
+  private final String name;
+
+  private final String externalName;
+
+  private final String description;
+
+  private final String variantGroup;
+
+  private final String businessEntityId;
+
+  private final List<AttributesParams> attributes;
+
+  private PriceVariantCreateParams(PriceVariantCreateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.name = builder.name;
+
+    this.externalName = builder.externalName;
+
+    this.description = builder.description;
+
+    this.variantGroup = builder.variantGroup;
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.attributes = builder.attributes;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getExternalName() {
+    return externalName;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public String getVariantGroup() {
+    return variantGroup;
+  }
+
+  public String getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public List<AttributesParams> getAttributes() {
+    return attributes;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.externalName != null) {
+
+      formData.put("external_name", this.externalName);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.variantGroup != null) {
+
+      formData.put("variant_group", this.variantGroup);
+    }
+
+    if (this.businessEntityId != null) {
+
+      formData.put("business_entity_id", this.businessEntityId);
+    }
+
+    if (this.attributes != null) {
+
+      // List of objects
+      for (int i = 0; i < this.attributes.size(); i++) {
+        AttributesParams item = this.attributes.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "attributes[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PriceVariantCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PriceVariantCreateBuilder builder() {
+    return new PriceVariantCreateBuilder();
+  }
+
+  public static final class PriceVariantCreateBuilder {
+
+    private String id;
+
+    private String name;
+
+    private String externalName;
+
+    private String description;
+
+    private String variantGroup;
+
+    private String businessEntityId;
+
+    private List<AttributesParams> attributes;
+
+    private PriceVariantCreateBuilder() {}
+
+    public PriceVariantCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public PriceVariantCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public PriceVariantCreateBuilder externalName(String value) {
+      this.externalName = value;
+      return this;
+    }
+
+    public PriceVariantCreateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public PriceVariantCreateBuilder variantGroup(String value) {
+      this.variantGroup = value;
+      return this;
+    }
+
+    public PriceVariantCreateBuilder businessEntityId(String value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public PriceVariantCreateBuilder attributes(List<AttributesParams> value) {
+      this.attributes = value;
+      return this;
+    }
+
+    public PriceVariantCreateParams build() {
+      return new PriceVariantCreateParams(this);
+    }
+  }
+
+  public static final class AttributesParams {
+
+    private final String name;
+
+    private final String value;
+
+    private AttributesParams(AttributesBuilder builder) {
+
+      this.name = builder.name;
+
+      this.value = builder.value;
+    }
+
+    public String getName() {
+      return name;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.name != null) {
+
+        formData.put("name", this.name);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AttributesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AttributesBuilder builder() {
+      return new AttributesBuilder();
+    }
+
+    public static final class AttributesBuilder {
+
+      private String name;
+
+      private String value;
+
+      private AttributesBuilder() {}
+
+      public AttributesBuilder name(String value) {
+        this.name = value;
+        return this;
+      }
+
+      public AttributesBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public AttributesParams build() {
+        return new AttributesParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantDeleteParams.java b/src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantDeleteParams.java
index dea2c4e8..bc75b902 100644
--- a/src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantDeleteParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.priceVariant.params;
+package com.chargebee.v4.models.priceVariant.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class PriceVariantDeleteParams {
 
-  private final Map<String, Object> formData;
-
-  private PriceVariantDeleteParams(PriceVariantDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private PriceVariantDeleteParams(PriceVariantDeleteBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static PriceVariantDeleteBuilder builder() {
   }
 
   public static final class PriceVariantDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private PriceVariantDeleteBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantListParams.java b/src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantListParams.java
rename to src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantListParams.java
index f0e70edf..741750ee 100644
--- a/src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantListParams.java
+++ b/src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.priceVariant.params;
+package com.chargebee.v4.models.priceVariant.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantRetrieveParams.java b/src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantRetrieveParams.java
index 37885298..5871846d 100644
--- a/src/main/java/com/chargebee/v4/core/models/priceVariant/params/PriceVariantRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.priceVariant.params;
+package com.chargebee.v4.models.priceVariant.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantUpdateParams.java b/src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantUpdateParams.java
new file mode 100644
index 00000000..4f66a5d5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/priceVariant/params/PriceVariantUpdateParams.java
@@ -0,0 +1,267 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.priceVariant.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class PriceVariantUpdateParams {
+
+  private final String name;
+
+  private final String externalName;
+
+  private final String description;
+
+  private final String variantGroup;
+
+  private final Status status;
+
+  private final List<AttributesParams> attributes;
+
+  private PriceVariantUpdateParams(PriceVariantUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.externalName = builder.externalName;
+
+    this.description = builder.description;
+
+    this.variantGroup = builder.variantGroup;
+
+    this.status = builder.status;
+
+    this.attributes = builder.attributes;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getExternalName() {
+    return externalName;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public String getVariantGroup() {
+    return variantGroup;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public List<AttributesParams> getAttributes() {
+    return attributes;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.externalName != null) {
+
+      formData.put("external_name", this.externalName);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.variantGroup != null) {
+
+      formData.put("variant_group", this.variantGroup);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.attributes != null) {
+
+      // List of objects
+      for (int i = 0; i < this.attributes.size(); i++) {
+        AttributesParams item = this.attributes.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "attributes[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PriceVariantUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PriceVariantUpdateBuilder builder() {
+    return new PriceVariantUpdateBuilder();
+  }
+
+  public static final class PriceVariantUpdateBuilder {
+
+    private String name;
+
+    private String externalName;
+
+    private String description;
+
+    private String variantGroup;
+
+    private Status status;
+
+    private List<AttributesParams> attributes;
+
+    private PriceVariantUpdateBuilder() {}
+
+    public PriceVariantUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public PriceVariantUpdateBuilder externalName(String value) {
+      this.externalName = value;
+      return this;
+    }
+
+    public PriceVariantUpdateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public PriceVariantUpdateBuilder variantGroup(String value) {
+      this.variantGroup = value;
+      return this;
+    }
+
+    public PriceVariantUpdateBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public PriceVariantUpdateBuilder attributes(List<AttributesParams> value) {
+      this.attributes = value;
+      return this;
+    }
+
+    public PriceVariantUpdateParams build() {
+      return new PriceVariantUpdateParams(this);
+    }
+  }
+
+  public enum Status {
+    ACTIVE("active"),
+
+    ARCHIVED("archived"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class AttributesParams {
+
+    private final String name;
+
+    private final String value;
+
+    private AttributesParams(AttributesBuilder builder) {
+
+      this.name = builder.name;
+
+      this.value = builder.value;
+    }
+
+    public String getName() {
+      return name;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.name != null) {
+
+        formData.put("name", this.name);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AttributesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AttributesBuilder builder() {
+      return new AttributesBuilder();
+    }
+
+    public static final class AttributesBuilder {
+
+      private String name;
+
+      private String value;
+
+      private AttributesBuilder() {}
+
+      public AttributesBuilder name(String value) {
+        this.name = value;
+        return this;
+      }
+
+      public AttributesBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public AttributesParams build() {
+        return new AttributesParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantCreateResponse.java b/src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantCreateResponse.java
index e274bebd..c1f7b216 100644
--- a/src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.priceVariant;
+package com.chargebee.v4.models.priceVariant.responses;
 
-import com.chargebee.v4.core.models.priceVariant.PriceVariant;
+import com.chargebee.v4.models.priceVariant.PriceVariant;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantDeleteResponse.java b/src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantDeleteResponse.java
index 2222c7ba..82bd3b6a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.priceVariant;
+package com.chargebee.v4.models.priceVariant.responses;
 
-import com.chargebee.v4.core.models.priceVariant.PriceVariant;
+import com.chargebee.v4.models.priceVariant.PriceVariant;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantListResponse.java b/src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantListResponse.java
rename to src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantListResponse.java
index c8eaeb4c..bc9ca0a7 100644
--- a/src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.priceVariant;
+package com.chargebee.v4.models.priceVariant.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.priceVariant.PriceVariant;
+import com.chargebee.v4.models.priceVariant.PriceVariant;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.PriceVariantService;
-import com.chargebee.v4.core.models.priceVariant.params.PriceVariantListParams;
+import com.chargebee.v4.services.PriceVariantService;
+import com.chargebee.v4.models.priceVariant.params.PriceVariantListParams;
 
 /** Immutable response object for PriceVariantList operation. Contains paginated list data. */
 public final class PriceVariantListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public PriceVariantListResponse nextPage() throws Exception {
+  public PriceVariantListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantRetrieveResponse.java
new file mode 100644
index 00000000..94bff51a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.priceVariant.responses;
+
+import com.chargebee.v4.models.priceVariant.PriceVariant;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for PriceVariantRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class PriceVariantRetrieveResponse extends BaseResponse {
+  private final PriceVariant priceVariant;
+
+  private PriceVariantRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.priceVariant = builder.priceVariant;
+  }
+
+  /** Parse JSON response into PriceVariantRetrieveResponse object. */
+  public static PriceVariantRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into PriceVariantRetrieveResponse object with HTTP response. */
+  public static PriceVariantRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __priceVariantJson = JsonUtil.getObject(json, "price_variant");
+      if (__priceVariantJson != null) {
+        builder.priceVariant(PriceVariant.fromJson(__priceVariantJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse PriceVariantRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for PriceVariantRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for PriceVariantRetrieveResponse. */
+  public static class Builder {
+
+    private PriceVariant priceVariant;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder priceVariant(PriceVariant priceVariant) {
+      this.priceVariant = priceVariant;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public PriceVariantRetrieveResponse build() {
+      return new PriceVariantRetrieveResponse(this);
+    }
+  }
+
+  /** Get the priceVariant from the response. */
+  public PriceVariant getPriceVariant() {
+    return priceVariant;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantUpdateResponse.java b/src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantUpdateResponse.java
index 6433127f..4a267ee9 100644
--- a/src/main/java/com/chargebee/v4/core/responses/priceVariant/PriceVariantUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.priceVariant;
+package com.chargebee.v4.models.priceVariant.responses;
 
-import com.chargebee.v4.core.models.priceVariant.PriceVariant;
+import com.chargebee.v4.models.priceVariant.PriceVariant;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/pricingPageSession/PricingPageSession.java b/src/main/java/com/chargebee/v4/models/pricingPageSession/PricingPageSession.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/pricingPageSession/PricingPageSession.java
rename to src/main/java/com/chargebee/v4/models/pricingPageSession/PricingPageSession.java
index 19717f8d..b232e221 100644
--- a/src/main/java/com/chargebee/v4/core/models/pricingPageSession/PricingPageSession.java
+++ b/src/main/java/com/chargebee/v4/models/pricingPageSession/PricingPageSession.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.pricingPageSession;
+package com.chargebee.v4.models.pricingPageSession;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/pricingPageSession/params/PricingPageSessionCreateForExistingSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/pricingPageSession/params/PricingPageSessionCreateForExistingSubscriptionParams.java
new file mode 100644
index 00000000..486537e9
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/pricingPageSession/params/PricingPageSessionCreateForExistingSubscriptionParams.java
@@ -0,0 +1,581 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.pricingPageSession.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class PricingPageSessionCreateForExistingSubscriptionParams {
+
+  private final String redirectUrl;
+
+  private final java.util.Map<String, Object> custom;
+
+  private final PricingPageParams pricingPage;
+
+  private final SubscriptionParams subscription;
+
+  private final List<DiscountsParams> discounts;
+
+  private PricingPageSessionCreateForExistingSubscriptionParams(
+      PricingPageSessionCreateForExistingSubscriptionBuilder builder) {
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.custom = builder.custom;
+
+    this.pricingPage = builder.pricingPage;
+
+    this.subscription = builder.subscription;
+
+    this.discounts = builder.discounts;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public java.util.Map<String, Object> getCustom() {
+    return custom;
+  }
+
+  public PricingPageParams getPricingPage() {
+    return pricingPage;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.custom != null) {
+
+      formData.put("custom", JsonUtil.toJson(this.custom));
+    }
+
+    if (this.pricingPage != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.pricingPage.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "pricing_page[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PricingPageSessionCreateForExistingSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PricingPageSessionCreateForExistingSubscriptionBuilder builder() {
+    return new PricingPageSessionCreateForExistingSubscriptionBuilder();
+  }
+
+  public static final class PricingPageSessionCreateForExistingSubscriptionBuilder {
+
+    private String redirectUrl;
+
+    private java.util.Map<String, Object> custom;
+
+    private PricingPageParams pricingPage;
+
+    private SubscriptionParams subscription;
+
+    private List<DiscountsParams> discounts;
+
+    private PricingPageSessionCreateForExistingSubscriptionBuilder() {}
+
+    public PricingPageSessionCreateForExistingSubscriptionBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForExistingSubscriptionBuilder custom(
+        java.util.Map<String, Object> value) {
+      this.custom = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForExistingSubscriptionBuilder pricingPage(
+        PricingPageParams value) {
+      this.pricingPage = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForExistingSubscriptionBuilder subscription(
+        SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForExistingSubscriptionBuilder discounts(
+        List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForExistingSubscriptionParams build() {
+      return new PricingPageSessionCreateForExistingSubscriptionParams(this);
+    }
+  }
+
+  public static final class PricingPageParams {
+
+    private final String id;
+
+    private PricingPageParams(PricingPageBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PricingPageParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PricingPageBuilder builder() {
+      return new PricingPageBuilder();
+    }
+
+    public static final class PricingPageBuilder {
+
+      private String id;
+
+      private PricingPageBuilder() {}
+
+      public PricingPageBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PricingPageParams build() {
+        return new PricingPageParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String label;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.label = builder.label;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getLabel() {
+      return label;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.label != null) {
+
+        formData.put("label", this.label);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String label;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder label(String value) {
+        this.label = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/pricingPageSession/params/PricingPageSessionCreateForNewSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/pricingPageSession/params/PricingPageSessionCreateForNewSubscriptionParams.java
new file mode 100644
index 00000000..7114c853
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/pricingPageSession/params/PricingPageSessionCreateForNewSubscriptionParams.java
@@ -0,0 +1,1546 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.pricingPageSession.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class PricingPageSessionCreateForNewSubscriptionParams {
+
+  private final String redirectUrl;
+
+  private final String businessEntityId;
+
+  private final Boolean autoSelectLocalCurrency;
+
+  private final java.util.Map<String, Object> custom;
+
+  private final PricingPageParams pricingPage;
+
+  private final SubscriptionParams subscription;
+
+  private final CustomerParams customer;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<DiscountsParams> discounts;
+
+  private PricingPageSessionCreateForNewSubscriptionParams(
+      PricingPageSessionCreateForNewSubscriptionBuilder builder) {
+
+    this.redirectUrl = builder.redirectUrl;
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.autoSelectLocalCurrency = builder.autoSelectLocalCurrency;
+
+    this.custom = builder.custom;
+
+    this.pricingPage = builder.pricingPage;
+
+    this.subscription = builder.subscription;
+
+    this.customer = builder.customer;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.discounts = builder.discounts;
+  }
+
+  public String getRedirectUrl() {
+    return redirectUrl;
+  }
+
+  public String getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public Boolean getAutoSelectLocalCurrency() {
+    return autoSelectLocalCurrency;
+  }
+
+  public java.util.Map<String, Object> getCustom() {
+    return custom;
+  }
+
+  public PricingPageParams getPricingPage() {
+    return pricingPage;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.redirectUrl != null) {
+
+      formData.put("redirect_url", this.redirectUrl);
+    }
+
+    if (this.businessEntityId != null) {
+
+      formData.put("business_entity_id", this.businessEntityId);
+    }
+
+    if (this.autoSelectLocalCurrency != null) {
+
+      formData.put("auto_select_local_currency", this.autoSelectLocalCurrency);
+    }
+
+    if (this.custom != null) {
+
+      formData.put("custom", JsonUtil.toJson(this.custom));
+    }
+
+    if (this.pricingPage != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.pricingPage.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "pricing_page[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PricingPageSessionCreateForNewSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PricingPageSessionCreateForNewSubscriptionBuilder builder() {
+    return new PricingPageSessionCreateForNewSubscriptionBuilder();
+  }
+
+  public static final class PricingPageSessionCreateForNewSubscriptionBuilder {
+
+    private String redirectUrl;
+
+    private String businessEntityId;
+
+    private Boolean autoSelectLocalCurrency;
+
+    private java.util.Map<String, Object> custom;
+
+    private PricingPageParams pricingPage;
+
+    private SubscriptionParams subscription;
+
+    private CustomerParams customer;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<DiscountsParams> discounts;
+
+    private PricingPageSessionCreateForNewSubscriptionBuilder() {}
+
+    public PricingPageSessionCreateForNewSubscriptionBuilder redirectUrl(String value) {
+      this.redirectUrl = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForNewSubscriptionBuilder businessEntityId(String value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForNewSubscriptionBuilder autoSelectLocalCurrency(
+        Boolean value) {
+      this.autoSelectLocalCurrency = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForNewSubscriptionBuilder custom(
+        java.util.Map<String, Object> value) {
+      this.custom = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForNewSubscriptionBuilder pricingPage(PricingPageParams value) {
+      this.pricingPage = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForNewSubscriptionBuilder subscription(
+        SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForNewSubscriptionBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForNewSubscriptionBuilder billingAddress(
+        BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForNewSubscriptionBuilder shippingAddress(
+        ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForNewSubscriptionBuilder discounts(
+        List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public PricingPageSessionCreateForNewSubscriptionParams build() {
+      return new PricingPageSessionCreateForNewSubscriptionParams(this);
+    }
+  }
+
+  public static final class PricingPageParams {
+
+    private final String id;
+
+    private PricingPageParams(PricingPageBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PricingPageParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PricingPageBuilder builder() {
+      return new PricingPageBuilder();
+    }
+
+    public static final class PricingPageBuilder {
+
+      private String id;
+
+      private PricingPageBuilder() {}
+
+      public PricingPageBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PricingPageParams build() {
+        return new PricingPageParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private final String email;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String locale;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.email = builder.email;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.locale = builder.locale;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLocale() {
+      return locale;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.locale != null) {
+
+        formData.put("locale", this.locale);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private String email;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String company;
+
+      private String phone;
+
+      private String locale;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CustomerBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CustomerBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public CustomerBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public CustomerBuilder locale(String value) {
+        this.locale = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String label;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.label = builder.label;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getLabel() {
+      return label;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.label != null) {
+
+        formData.put("label", this.label);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String label;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder label(String value) {
+        this.label = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/pricingPageSession/PricingPageSessionCreateForExistingSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/pricingPageSession/responses/PricingPageSessionCreateForExistingSubscriptionResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/pricingPageSession/PricingPageSessionCreateForExistingSubscriptionResponse.java
rename to src/main/java/com/chargebee/v4/models/pricingPageSession/responses/PricingPageSessionCreateForExistingSubscriptionResponse.java
index ce49e46c..85dde8be 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pricingPageSession/PricingPageSessionCreateForExistingSubscriptionResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pricingPageSession/responses/PricingPageSessionCreateForExistingSubscriptionResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.pricingPageSession;
+package com.chargebee.v4.models.pricingPageSession.responses;
 
-import com.chargebee.v4.core.models.pricingPageSession.PricingPageSession;
+import com.chargebee.v4.models.pricingPageSession.PricingPageSession;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/pricingPageSession/PricingPageSessionCreateForNewSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/pricingPageSession/responses/PricingPageSessionCreateForNewSubscriptionResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/pricingPageSession/PricingPageSessionCreateForNewSubscriptionResponse.java
rename to src/main/java/com/chargebee/v4/models/pricingPageSession/responses/PricingPageSessionCreateForNewSubscriptionResponse.java
index d3a215db..d5800888 100644
--- a/src/main/java/com/chargebee/v4/core/responses/pricingPageSession/PricingPageSessionCreateForNewSubscriptionResponse.java
+++ b/src/main/java/com/chargebee/v4/models/pricingPageSession/responses/PricingPageSessionCreateForNewSubscriptionResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.pricingPageSession;
+package com.chargebee.v4.models.pricingPageSession.responses;
 
-import com.chargebee.v4.core.models.pricingPageSession.PricingPageSession;
+import com.chargebee.v4.models.pricingPageSession.PricingPageSession;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/product/Product.java b/src/main/java/com/chargebee/v4/models/product/Product.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/product/Product.java
rename to src/main/java/com/chargebee/v4/models/product/Product.java
index 3bcd9e8d..10f8b0db 100644
--- a/src/main/java/com/chargebee/v4/core/models/product/Product.java
+++ b/src/main/java/com/chargebee/v4/models/product/Product.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.product;
+package com.chargebee.v4.models.product;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/product/params/ProductCreateParams.java b/src/main/java/com/chargebee/v4/models/product/params/ProductCreateParams.java
new file mode 100644
index 00000000..89dea02b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/product/params/ProductCreateParams.java
@@ -0,0 +1,229 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.product.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ProductCreateParams {
+
+  private final String name;
+
+  private final String externalName;
+
+  private final Status status;
+
+  private final String id;
+
+  private final String description;
+
+  private final String sku;
+
+  private final java.util.Map<String, Object> metadata;
+
+  private final Boolean shippable;
+
+  private ProductCreateParams(ProductCreateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.externalName = builder.externalName;
+
+    this.status = builder.status;
+
+    this.id = builder.id;
+
+    this.description = builder.description;
+
+    this.sku = builder.sku;
+
+    this.metadata = builder.metadata;
+
+    this.shippable = builder.shippable;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getExternalName() {
+    return externalName;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public String getSku() {
+    return sku;
+  }
+
+  public java.util.Map<String, Object> getMetadata() {
+    return metadata;
+  }
+
+  public Boolean getShippable() {
+    return shippable;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.externalName != null) {
+
+      formData.put("external_name", this.externalName);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.sku != null) {
+
+      formData.put("sku", this.sku);
+    }
+
+    if (this.metadata != null) {
+
+      formData.put("metadata", JsonUtil.toJson(this.metadata));
+    }
+
+    if (this.shippable != null) {
+
+      formData.put("shippable", this.shippable);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ProductCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ProductCreateBuilder builder() {
+    return new ProductCreateBuilder();
+  }
+
+  public static final class ProductCreateBuilder {
+
+    private String name;
+
+    private String externalName;
+
+    private Status status;
+
+    private String id;
+
+    private String description;
+
+    private String sku;
+
+    private java.util.Map<String, Object> metadata;
+
+    private Boolean shippable;
+
+    private ProductCreateBuilder() {}
+
+    public ProductCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public ProductCreateBuilder externalName(String value) {
+      this.externalName = value;
+      return this;
+    }
+
+    public ProductCreateBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public ProductCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public ProductCreateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public ProductCreateBuilder sku(String value) {
+      this.sku = value;
+      return this;
+    }
+
+    public ProductCreateBuilder metadata(java.util.Map<String, Object> value) {
+      this.metadata = value;
+      return this;
+    }
+
+    public ProductCreateBuilder shippable(Boolean value) {
+      this.shippable = value;
+      return this;
+    }
+
+    public ProductCreateParams build() {
+      return new ProductCreateParams(this);
+    }
+  }
+
+  public enum Status {
+    ACTIVE("active"),
+
+    INACTIVE("inactive"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/product/params/ProductDeleteParams.java b/src/main/java/com/chargebee/v4/models/product/params/ProductDeleteParams.java
new file mode 100644
index 00000000..44f74240
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/product/params/ProductDeleteParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.product.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ProductDeleteParams {
+
+  private ProductDeleteParams(ProductDeleteBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for ProductDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ProductDeleteBuilder builder() {
+    return new ProductDeleteBuilder();
+  }
+
+  public static final class ProductDeleteBuilder {
+
+    private ProductDeleteBuilder() {}
+
+    public ProductDeleteParams build() {
+      return new ProductDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/product/params/ProductListParams.java b/src/main/java/com/chargebee/v4/models/product/params/ProductListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/product/params/ProductListParams.java
rename to src/main/java/com/chargebee/v4/models/product/params/ProductListParams.java
index e50ce3c9..f709cd9e 100644
--- a/src/main/java/com/chargebee/v4/core/models/product/params/ProductListParams.java
+++ b/src/main/java/com/chargebee/v4/models/product/params/ProductListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.product.params;
+package com.chargebee.v4.models.product.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/product/params/ProductRetrieveParams.java b/src/main/java/com/chargebee/v4/models/product/params/ProductRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/product/params/ProductRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/product/params/ProductRetrieveParams.java
index 389c9f82..a58c6bf9 100644
--- a/src/main/java/com/chargebee/v4/core/models/product/params/ProductRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/product/params/ProductRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.product.params;
+package com.chargebee.v4.models.product.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/product/params/ProductUpdateOptionsParams.java b/src/main/java/com/chargebee/v4/models/product/params/ProductUpdateOptionsParams.java
new file mode 100644
index 00000000..8d5066f7
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/product/params/ProductUpdateOptionsParams.java
@@ -0,0 +1,180 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.product.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class ProductUpdateOptionsParams {
+
+  private final List<String> removeOptions;
+
+  private final List<OptionsParams> options;
+
+  private ProductUpdateOptionsParams(ProductUpdateOptionsBuilder builder) {
+
+    this.removeOptions = builder.removeOptions;
+
+    this.options = builder.options;
+  }
+
+  public List<String> getRemoveOptions() {
+    return removeOptions;
+  }
+
+  public List<OptionsParams> getOptions() {
+    return options;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.removeOptions != null) {
+
+      formData.put("remove_options", this.removeOptions);
+    }
+
+    if (this.options != null) {
+
+      // List of objects
+      for (int i = 0; i < this.options.size(); i++) {
+        OptionsParams item = this.options.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "options[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ProductUpdateOptionsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ProductUpdateOptionsBuilder builder() {
+    return new ProductUpdateOptionsBuilder();
+  }
+
+  public static final class ProductUpdateOptionsBuilder {
+
+    private List<String> removeOptions;
+
+    private List<OptionsParams> options;
+
+    private ProductUpdateOptionsBuilder() {}
+
+    public ProductUpdateOptionsBuilder removeOptions(List<String> value) {
+      this.removeOptions = value;
+      return this;
+    }
+
+    public ProductUpdateOptionsBuilder options(List<OptionsParams> value) {
+      this.options = value;
+      return this;
+    }
+
+    public ProductUpdateOptionsParams build() {
+      return new ProductUpdateOptionsParams(this);
+    }
+  }
+
+  public static final class OptionsParams {
+
+    private final String name;
+
+    private final List<Object> values;
+
+    private final String defaultValue;
+
+    private OptionsParams(OptionsBuilder builder) {
+
+      this.name = builder.name;
+
+      this.values = builder.values;
+
+      this.defaultValue = builder.defaultValue;
+    }
+
+    public String getName() {
+      return name;
+    }
+
+    public List<Object> getValues() {
+      return values;
+    }
+
+    public String getDefaultValue() {
+      return defaultValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.name != null) {
+
+        formData.put("name", this.name);
+      }
+
+      if (this.values != null) {
+
+        formData.put("values", JsonUtil.toJson(this.values));
+      }
+
+      if (this.defaultValue != null) {
+
+        formData.put("default_value", this.defaultValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for OptionsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static OptionsBuilder builder() {
+      return new OptionsBuilder();
+    }
+
+    public static final class OptionsBuilder {
+
+      private String name;
+
+      private List<Object> values;
+
+      private String defaultValue;
+
+      private OptionsBuilder() {}
+
+      public OptionsBuilder name(String value) {
+        this.name = value;
+        return this;
+      }
+
+      public OptionsBuilder values(List<Object> value) {
+        this.values = value;
+        return this;
+      }
+
+      public OptionsBuilder defaultValue(String value) {
+        this.defaultValue = value;
+        return this;
+      }
+
+      public OptionsParams build() {
+        return new OptionsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/product/params/ProductUpdateParams.java b/src/main/java/com/chargebee/v4/models/product/params/ProductUpdateParams.java
new file mode 100644
index 00000000..98c506f9
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/product/params/ProductUpdateParams.java
@@ -0,0 +1,209 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.product.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ProductUpdateParams {
+
+  private final String name;
+
+  private final String externalName;
+
+  private final String description;
+
+  private final Status status;
+
+  private final String sku;
+
+  private final Boolean shippable;
+
+  private final java.util.Map<String, Object> metadata;
+
+  private ProductUpdateParams(ProductUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.externalName = builder.externalName;
+
+    this.description = builder.description;
+
+    this.status = builder.status;
+
+    this.sku = builder.sku;
+
+    this.shippable = builder.shippable;
+
+    this.metadata = builder.metadata;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getExternalName() {
+    return externalName;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public String getSku() {
+    return sku;
+  }
+
+  public Boolean getShippable() {
+    return shippable;
+  }
+
+  public java.util.Map<String, Object> getMetadata() {
+    return metadata;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.externalName != null) {
+
+      formData.put("external_name", this.externalName);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.sku != null) {
+
+      formData.put("sku", this.sku);
+    }
+
+    if (this.shippable != null) {
+
+      formData.put("shippable", this.shippable);
+    }
+
+    if (this.metadata != null) {
+
+      formData.put("metadata", JsonUtil.toJson(this.metadata));
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ProductUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ProductUpdateBuilder builder() {
+    return new ProductUpdateBuilder();
+  }
+
+  public static final class ProductUpdateBuilder {
+
+    private String name;
+
+    private String externalName;
+
+    private String description;
+
+    private Status status;
+
+    private String sku;
+
+    private Boolean shippable;
+
+    private java.util.Map<String, Object> metadata;
+
+    private ProductUpdateBuilder() {}
+
+    public ProductUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public ProductUpdateBuilder externalName(String value) {
+      this.externalName = value;
+      return this;
+    }
+
+    public ProductUpdateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public ProductUpdateBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public ProductUpdateBuilder sku(String value) {
+      this.sku = value;
+      return this;
+    }
+
+    public ProductUpdateBuilder shippable(Boolean value) {
+      this.shippable = value;
+      return this;
+    }
+
+    public ProductUpdateBuilder metadata(java.util.Map<String, Object> value) {
+      this.metadata = value;
+      return this;
+    }
+
+    public ProductUpdateParams build() {
+      return new ProductUpdateParams(this);
+    }
+  }
+
+  public enum Status {
+    ACTIVE("active"),
+
+    INACTIVE("inactive"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/product/ProductCreateResponse.java b/src/main/java/com/chargebee/v4/models/product/responses/ProductCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/product/ProductCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/product/responses/ProductCreateResponse.java
index 89ff75cc..f3f73539 100644
--- a/src/main/java/com/chargebee/v4/core/responses/product/ProductCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/product/responses/ProductCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.product;
+package com.chargebee.v4.models.product.responses;
 
-import com.chargebee.v4.core.models.product.Product;
+import com.chargebee.v4.models.product.Product;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/product/ProductDeleteResponse.java b/src/main/java/com/chargebee/v4/models/product/responses/ProductDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/product/ProductDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/product/responses/ProductDeleteResponse.java
index a8496e60..ea97ef40 100644
--- a/src/main/java/com/chargebee/v4/core/responses/product/ProductDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/product/responses/ProductDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.product;
+package com.chargebee.v4.models.product.responses;
 
-import com.chargebee.v4.core.models.product.Product;
+import com.chargebee.v4.models.product.Product;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/product/ProductListResponse.java b/src/main/java/com/chargebee/v4/models/product/responses/ProductListResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/product/ProductListResponse.java
rename to src/main/java/com/chargebee/v4/models/product/responses/ProductListResponse.java
index 59959489..44ae3df3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/product/ProductListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/product/responses/ProductListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.product;
+package com.chargebee.v4.models.product.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.product.Product;
+import com.chargebee.v4.models.product.Product;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.ProductService;
-import com.chargebee.v4.core.models.product.params.ProductListParams;
+import com.chargebee.v4.services.ProductService;
+import com.chargebee.v4.models.product.params.ProductListParams;
 
 /** Immutable response object for ProductList operation. Contains paginated list data. */
 public final class ProductListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public ProductListResponse nextPage() throws Exception {
+  public ProductListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/product/responses/ProductRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/product/responses/ProductRetrieveResponse.java
new file mode 100644
index 00000000..33941460
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/product/responses/ProductRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.product.responses;
+
+import com.chargebee.v4.models.product.Product;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ProductRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class ProductRetrieveResponse extends BaseResponse {
+  private final Product product;
+
+  private ProductRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.product = builder.product;
+  }
+
+  /** Parse JSON response into ProductRetrieveResponse object. */
+  public static ProductRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ProductRetrieveResponse object with HTTP response. */
+  public static ProductRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __productJson = JsonUtil.getObject(json, "product");
+      if (__productJson != null) {
+        builder.product(Product.fromJson(__productJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ProductRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ProductRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ProductRetrieveResponse. */
+  public static class Builder {
+
+    private Product product;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder product(Product product) {
+      this.product = product;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ProductRetrieveResponse build() {
+      return new ProductRetrieveResponse(this);
+    }
+  }
+
+  /** Get the product from the response. */
+  public Product getProduct() {
+    return product;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/product/ProductUpdateOptionsResponse.java b/src/main/java/com/chargebee/v4/models/product/responses/ProductUpdateOptionsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/product/ProductUpdateOptionsResponse.java
rename to src/main/java/com/chargebee/v4/models/product/responses/ProductUpdateOptionsResponse.java
index c5dac157..6ad2d74e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/product/ProductUpdateOptionsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/product/responses/ProductUpdateOptionsResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.product;
+package com.chargebee.v4.models.product.responses;
 
-import com.chargebee.v4.core.models.product.Product;
+import com.chargebee.v4.models.product.Product;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/product/ProductUpdateResponse.java b/src/main/java/com/chargebee/v4/models/product/responses/ProductUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/product/ProductUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/product/responses/ProductUpdateResponse.java
index 8accd94c..4f5b5740 100644
--- a/src/main/java/com/chargebee/v4/core/responses/product/ProductUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/product/responses/ProductUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.product;
+package com.chargebee.v4.models.product.responses;
 
-import com.chargebee.v4.core.models.product.Product;
+import com.chargebee.v4.models.product.Product;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/promotionalCredit/PromotionalCredit.java b/src/main/java/com/chargebee/v4/models/promotionalCredit/PromotionalCredit.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/promotionalCredit/PromotionalCredit.java
rename to src/main/java/com/chargebee/v4/models/promotionalCredit/PromotionalCredit.java
index da9212fc..2442fb8f 100644
--- a/src/main/java/com/chargebee/v4/core/models/promotionalCredit/PromotionalCredit.java
+++ b/src/main/java/com/chargebee/v4/models/promotionalCredit/PromotionalCredit.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.promotionalCredit;
+package com.chargebee.v4.models.promotionalCredit;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditAddParams.java b/src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditAddParams.java
new file mode 100644
index 00000000..43f2fc85
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditAddParams.java
@@ -0,0 +1,210 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.promotionalCredit.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PromotionalCreditAddParams {
+
+  private final String customerId;
+
+  private final Long amount;
+
+  private final String amountInDecimal;
+
+  private final String currencyCode;
+
+  private final String description;
+
+  private final CreditType creditType;
+
+  private final String reference;
+
+  private PromotionalCreditAddParams(PromotionalCreditAddBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.amount = builder.amount;
+
+    this.amountInDecimal = builder.amountInDecimal;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.description = builder.description;
+
+    this.creditType = builder.creditType;
+
+    this.reference = builder.reference;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getAmountInDecimal() {
+    return amountInDecimal;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public CreditType getCreditType() {
+    return creditType;
+  }
+
+  public String getReference() {
+    return reference;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.amountInDecimal != null) {
+
+      formData.put("amount_in_decimal", this.amountInDecimal);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.creditType != null) {
+
+      formData.put("credit_type", this.creditType);
+    }
+
+    if (this.reference != null) {
+
+      formData.put("reference", this.reference);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PromotionalCreditAddParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PromotionalCreditAddBuilder builder() {
+    return new PromotionalCreditAddBuilder();
+  }
+
+  public static final class PromotionalCreditAddBuilder {
+
+    private String customerId;
+
+    private Long amount;
+
+    private String amountInDecimal;
+
+    private String currencyCode;
+
+    private String description;
+
+    private CreditType creditType;
+
+    private String reference;
+
+    private PromotionalCreditAddBuilder() {}
+
+    public PromotionalCreditAddBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PromotionalCreditAddBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public PromotionalCreditAddBuilder amountInDecimal(String value) {
+      this.amountInDecimal = value;
+      return this;
+    }
+
+    public PromotionalCreditAddBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public PromotionalCreditAddBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public PromotionalCreditAddBuilder creditType(CreditType value) {
+      this.creditType = value;
+      return this;
+    }
+
+    public PromotionalCreditAddBuilder reference(String value) {
+      this.reference = value;
+      return this;
+    }
+
+    public PromotionalCreditAddParams build() {
+      return new PromotionalCreditAddParams(this);
+    }
+  }
+
+  public enum CreditType {
+    LOYALTY_CREDITS("loyalty_credits"),
+
+    REFERRAL_REWARDS("referral_rewards"),
+
+    GENERAL("general"),
+
+    /** An enum member indicating that CreditType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CreditType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CreditType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CreditType enumValue : CreditType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditDeductParams.java b/src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditDeductParams.java
new file mode 100644
index 00000000..540e8cac
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditDeductParams.java
@@ -0,0 +1,210 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.promotionalCredit.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PromotionalCreditDeductParams {
+
+  private final String customerId;
+
+  private final Long amount;
+
+  private final String amountInDecimal;
+
+  private final String currencyCode;
+
+  private final String description;
+
+  private final CreditType creditType;
+
+  private final String reference;
+
+  private PromotionalCreditDeductParams(PromotionalCreditDeductBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.amount = builder.amount;
+
+    this.amountInDecimal = builder.amountInDecimal;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.description = builder.description;
+
+    this.creditType = builder.creditType;
+
+    this.reference = builder.reference;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getAmountInDecimal() {
+    return amountInDecimal;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public CreditType getCreditType() {
+    return creditType;
+  }
+
+  public String getReference() {
+    return reference;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.amountInDecimal != null) {
+
+      formData.put("amount_in_decimal", this.amountInDecimal);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.creditType != null) {
+
+      formData.put("credit_type", this.creditType);
+    }
+
+    if (this.reference != null) {
+
+      formData.put("reference", this.reference);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PromotionalCreditDeductParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PromotionalCreditDeductBuilder builder() {
+    return new PromotionalCreditDeductBuilder();
+  }
+
+  public static final class PromotionalCreditDeductBuilder {
+
+    private String customerId;
+
+    private Long amount;
+
+    private String amountInDecimal;
+
+    private String currencyCode;
+
+    private String description;
+
+    private CreditType creditType;
+
+    private String reference;
+
+    private PromotionalCreditDeductBuilder() {}
+
+    public PromotionalCreditDeductBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PromotionalCreditDeductBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public PromotionalCreditDeductBuilder amountInDecimal(String value) {
+      this.amountInDecimal = value;
+      return this;
+    }
+
+    public PromotionalCreditDeductBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public PromotionalCreditDeductBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public PromotionalCreditDeductBuilder creditType(CreditType value) {
+      this.creditType = value;
+      return this;
+    }
+
+    public PromotionalCreditDeductBuilder reference(String value) {
+      this.reference = value;
+      return this;
+    }
+
+    public PromotionalCreditDeductParams build() {
+      return new PromotionalCreditDeductParams(this);
+    }
+  }
+
+  public enum CreditType {
+    LOYALTY_CREDITS("loyalty_credits"),
+
+    REFERRAL_REWARDS("referral_rewards"),
+
+    GENERAL("general"),
+
+    /** An enum member indicating that CreditType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CreditType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CreditType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CreditType enumValue : CreditType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditListParams.java b/src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditListParams.java
rename to src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditListParams.java
index 18828dca..c949984f 100644
--- a/src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditListParams.java
+++ b/src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.promotionalCredit.params;
+package com.chargebee.v4.models.promotionalCredit.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditRetrieveParams.java b/src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditRetrieveParams.java
index 739e901f..bacc1ad8 100644
--- a/src/main/java/com/chargebee/v4/core/models/promotionalCredit/params/PromotionalCreditRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.promotionalCredit.params;
+package com.chargebee.v4.models.promotionalCredit.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditSetParams.java b/src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditSetParams.java
new file mode 100644
index 00000000..829ab233
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/promotionalCredit/params/PromotionalCreditSetParams.java
@@ -0,0 +1,210 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.promotionalCredit.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class PromotionalCreditSetParams {
+
+  private final String customerId;
+
+  private final Long amount;
+
+  private final String amountInDecimal;
+
+  private final String currencyCode;
+
+  private final String description;
+
+  private final CreditType creditType;
+
+  private final String reference;
+
+  private PromotionalCreditSetParams(PromotionalCreditSetBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.amount = builder.amount;
+
+    this.amountInDecimal = builder.amountInDecimal;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.description = builder.description;
+
+    this.creditType = builder.creditType;
+
+    this.reference = builder.reference;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getAmountInDecimal() {
+    return amountInDecimal;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public CreditType getCreditType() {
+    return creditType;
+  }
+
+  public String getReference() {
+    return reference;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.amountInDecimal != null) {
+
+      formData.put("amount_in_decimal", this.amountInDecimal);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.creditType != null) {
+
+      formData.put("credit_type", this.creditType);
+    }
+
+    if (this.reference != null) {
+
+      formData.put("reference", this.reference);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PromotionalCreditSetParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PromotionalCreditSetBuilder builder() {
+    return new PromotionalCreditSetBuilder();
+  }
+
+  public static final class PromotionalCreditSetBuilder {
+
+    private String customerId;
+
+    private Long amount;
+
+    private String amountInDecimal;
+
+    private String currencyCode;
+
+    private String description;
+
+    private CreditType creditType;
+
+    private String reference;
+
+    private PromotionalCreditSetBuilder() {}
+
+    public PromotionalCreditSetBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PromotionalCreditSetBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public PromotionalCreditSetBuilder amountInDecimal(String value) {
+      this.amountInDecimal = value;
+      return this;
+    }
+
+    public PromotionalCreditSetBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public PromotionalCreditSetBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public PromotionalCreditSetBuilder creditType(CreditType value) {
+      this.creditType = value;
+      return this;
+    }
+
+    public PromotionalCreditSetBuilder reference(String value) {
+      this.reference = value;
+      return this;
+    }
+
+    public PromotionalCreditSetParams build() {
+      return new PromotionalCreditSetParams(this);
+    }
+  }
+
+  public enum CreditType {
+    LOYALTY_CREDITS("loyalty_credits"),
+
+    REFERRAL_REWARDS("referral_rewards"),
+
+    GENERAL("general"),
+
+    /** An enum member indicating that CreditType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CreditType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CreditType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CreditType enumValue : CreditType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditAddResponse.java b/src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditAddResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditAddResponse.java
rename to src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditAddResponse.java
index dce10236..d9f048f6 100644
--- a/src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditAddResponse.java
+++ b/src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditAddResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.promotionalCredit;
+package com.chargebee.v4.models.promotionalCredit.responses;
 
-import com.chargebee.v4.core.models.promotionalCredit.PromotionalCredit;
+import com.chargebee.v4.models.promotionalCredit.PromotionalCredit;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditDeductResponse.java b/src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditDeductResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditDeductResponse.java
rename to src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditDeductResponse.java
index 9a037d1a..b1b26542 100644
--- a/src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditDeductResponse.java
+++ b/src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditDeductResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.promotionalCredit;
+package com.chargebee.v4.models.promotionalCredit.responses;
 
-import com.chargebee.v4.core.models.promotionalCredit.PromotionalCredit;
+import com.chargebee.v4.models.promotionalCredit.PromotionalCredit;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditListResponse.java b/src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditListResponse.java
rename to src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditListResponse.java
index bf6f690b..a67c08c2 100644
--- a/src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.promotionalCredit;
+package com.chargebee.v4.models.promotionalCredit.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.promotionalCredit.PromotionalCredit;
+import com.chargebee.v4.models.promotionalCredit.PromotionalCredit;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.PromotionalCreditService;
-import com.chargebee.v4.core.models.promotionalCredit.params.PromotionalCreditListParams;
+import com.chargebee.v4.services.PromotionalCreditService;
+import com.chargebee.v4.models.promotionalCredit.params.PromotionalCreditListParams;
 
 /** Immutable response object for PromotionalCreditList operation. Contains paginated list data. */
 public final class PromotionalCreditListResponse {
@@ -99,9 +100,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public PromotionalCreditListResponse nextPage() throws Exception {
+  public PromotionalCreditListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditRetrieveResponse.java
new file mode 100644
index 00000000..5838b132
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.promotionalCredit.responses;
+
+import com.chargebee.v4.models.promotionalCredit.PromotionalCredit;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for PromotionalCreditRetrieve operation. Contains the response data
+ * from a single resource get operation.
+ */
+public final class PromotionalCreditRetrieveResponse extends BaseResponse {
+  private final PromotionalCredit promotionalCredit;
+
+  private PromotionalCreditRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.promotionalCredit = builder.promotionalCredit;
+  }
+
+  /** Parse JSON response into PromotionalCreditRetrieveResponse object. */
+  public static PromotionalCreditRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into PromotionalCreditRetrieveResponse object with HTTP response. */
+  public static PromotionalCreditRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __promotionalCreditJson = JsonUtil.getObject(json, "promotional_credit");
+      if (__promotionalCreditJson != null) {
+        builder.promotionalCredit(PromotionalCredit.fromJson(__promotionalCreditJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse PromotionalCreditRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for PromotionalCreditRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for PromotionalCreditRetrieveResponse. */
+  public static class Builder {
+
+    private PromotionalCredit promotionalCredit;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder promotionalCredit(PromotionalCredit promotionalCredit) {
+      this.promotionalCredit = promotionalCredit;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public PromotionalCreditRetrieveResponse build() {
+      return new PromotionalCreditRetrieveResponse(this);
+    }
+  }
+
+  /** Get the promotionalCredit from the response. */
+  public PromotionalCredit getPromotionalCredit() {
+    return promotionalCredit;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditSetResponse.java b/src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditSetResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditSetResponse.java
rename to src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditSetResponse.java
index 77908ee8..4ea3a6cf 100644
--- a/src/main/java/com/chargebee/v4/core/responses/promotionalCredit/PromotionalCreditSetResponse.java
+++ b/src/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditSetResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.promotionalCredit;
+package com.chargebee.v4.models.promotionalCredit.responses;
 
-import com.chargebee.v4.core.models.promotionalCredit.PromotionalCredit;
+import com.chargebee.v4.models.promotionalCredit.PromotionalCredit;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/purchase/Purchase.java b/src/main/java/com/chargebee/v4/models/purchase/Purchase.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/purchase/Purchase.java
rename to src/main/java/com/chargebee/v4/models/purchase/Purchase.java
index 7532f110..00a73bc3 100644
--- a/src/main/java/com/chargebee/v4/core/models/purchase/Purchase.java
+++ b/src/main/java/com/chargebee/v4/models/purchase/Purchase.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.purchase;
+package com.chargebee.v4.models.purchase;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/purchase/params/PurchaseCreateParams.java b/src/main/java/com/chargebee/v4/models/purchase/params/PurchaseCreateParams.java
new file mode 100644
index 00000000..2258af26
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/purchase/params/PurchaseCreateParams.java
@@ -0,0 +1,1886 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.purchase.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class PurchaseCreateParams {
+
+  private final String customerId;
+
+  private final String paymentSourceId;
+
+  private final Boolean replacePrimaryPaymentSource;
+
+  private final InvoiceInfoParams invoiceInfo;
+
+  private final PaymentScheduleParams paymentSchedule;
+
+  private final StatementDescriptorParams statementDescriptor;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final List<PurchaseItemsParams> purchaseItems;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<ShippingAddressesParams> shippingAddresses;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<SubscriptionInfoParams> subscriptionInfo;
+
+  private final List<ContractTermsParams> contractTerms;
+
+  private PurchaseCreateParams(PurchaseCreateBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.replacePrimaryPaymentSource = builder.replacePrimaryPaymentSource;
+
+    this.invoiceInfo = builder.invoiceInfo;
+
+    this.paymentSchedule = builder.paymentSchedule;
+
+    this.statementDescriptor = builder.statementDescriptor;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.purchaseItems = builder.purchaseItems;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.shippingAddresses = builder.shippingAddresses;
+
+    this.discounts = builder.discounts;
+
+    this.subscriptionInfo = builder.subscriptionInfo;
+
+    this.contractTerms = builder.contractTerms;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public Boolean getReplacePrimaryPaymentSource() {
+    return replacePrimaryPaymentSource;
+  }
+
+  public InvoiceInfoParams getInvoiceInfo() {
+    return invoiceInfo;
+  }
+
+  public PaymentScheduleParams getPaymentSchedule() {
+    return paymentSchedule;
+  }
+
+  public StatementDescriptorParams getStatementDescriptor() {
+    return statementDescriptor;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public List<PurchaseItemsParams> getPurchaseItems() {
+    return purchaseItems;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<ShippingAddressesParams> getShippingAddresses() {
+    return shippingAddresses;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<SubscriptionInfoParams> getSubscriptionInfo() {
+    return subscriptionInfo;
+  }
+
+  public List<ContractTermsParams> getContractTerms() {
+    return contractTerms;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.replacePrimaryPaymentSource != null) {
+
+      formData.put("replace_primary_payment_source", this.replacePrimaryPaymentSource);
+    }
+
+    if (this.invoiceInfo != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.invoiceInfo.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "invoice_info[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentSchedule != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentSchedule.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_schedule[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.statementDescriptor != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.statementDescriptor.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.purchaseItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.purchaseItems.size(); i++) {
+        PurchaseItemsParams item = this.purchaseItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "purchase_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.shippingAddresses != null) {
+
+      // List of objects
+      for (int i = 0; i < this.shippingAddresses.size(); i++) {
+        ShippingAddressesParams item = this.shippingAddresses.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "shipping_addresses[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.subscriptionInfo != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionInfo.size(); i++) {
+        SubscriptionInfoParams item = this.subscriptionInfo.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_info[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.contractTerms != null) {
+
+      // List of objects
+      for (int i = 0; i < this.contractTerms.size(); i++) {
+        ContractTermsParams item = this.contractTerms.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "contract_terms[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PurchaseCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PurchaseCreateBuilder builder() {
+    return new PurchaseCreateBuilder();
+  }
+
+  public static final class PurchaseCreateBuilder {
+
+    private String customerId;
+
+    private String paymentSourceId;
+
+    private Boolean replacePrimaryPaymentSource;
+
+    private InvoiceInfoParams invoiceInfo;
+
+    private PaymentScheduleParams paymentSchedule;
+
+    private StatementDescriptorParams statementDescriptor;
+
+    private PaymentIntentParams paymentIntent;
+
+    private List<PurchaseItemsParams> purchaseItems;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<ShippingAddressesParams> shippingAddresses;
+
+    private List<DiscountsParams> discounts;
+
+    private List<SubscriptionInfoParams> subscriptionInfo;
+
+    private List<ContractTermsParams> contractTerms;
+
+    private PurchaseCreateBuilder() {}
+
+    public PurchaseCreateBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PurchaseCreateBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public PurchaseCreateBuilder replacePrimaryPaymentSource(Boolean value) {
+      this.replacePrimaryPaymentSource = value;
+      return this;
+    }
+
+    public PurchaseCreateBuilder invoiceInfo(InvoiceInfoParams value) {
+      this.invoiceInfo = value;
+      return this;
+    }
+
+    public PurchaseCreateBuilder paymentSchedule(PaymentScheduleParams value) {
+      this.paymentSchedule = value;
+      return this;
+    }
+
+    public PurchaseCreateBuilder statementDescriptor(StatementDescriptorParams value) {
+      this.statementDescriptor = value;
+      return this;
+    }
+
+    public PurchaseCreateBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public PurchaseCreateBuilder purchaseItems(List<PurchaseItemsParams> value) {
+      this.purchaseItems = value;
+      return this;
+    }
+
+    public PurchaseCreateBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public PurchaseCreateBuilder shippingAddresses(List<ShippingAddressesParams> value) {
+      this.shippingAddresses = value;
+      return this;
+    }
+
+    public PurchaseCreateBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public PurchaseCreateBuilder subscriptionInfo(List<SubscriptionInfoParams> value) {
+      this.subscriptionInfo = value;
+      return this;
+    }
+
+    public PurchaseCreateBuilder contractTerms(List<ContractTermsParams> value) {
+      this.contractTerms = value;
+      return this;
+    }
+
+    public PurchaseCreateParams build() {
+      return new PurchaseCreateParams(this);
+    }
+  }
+
+  public static final class InvoiceInfoParams {
+
+    private final String poNumber;
+
+    private final String notes;
+
+    private InvoiceInfoParams(InvoiceInfoBuilder builder) {
+
+      this.poNumber = builder.poNumber;
+
+      this.notes = builder.notes;
+    }
+
+    public String getPoNumber() {
+      return poNumber;
+    }
+
+    public String getNotes() {
+      return notes;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.poNumber != null) {
+
+        formData.put("po_number", this.poNumber);
+      }
+
+      if (this.notes != null) {
+
+        formData.put("notes", this.notes);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceInfoParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceInfoBuilder builder() {
+      return new InvoiceInfoBuilder();
+    }
+
+    public static final class InvoiceInfoBuilder {
+
+      private String poNumber;
+
+      private String notes;
+
+      private InvoiceInfoBuilder() {}
+
+      public InvoiceInfoBuilder poNumber(String value) {
+        this.poNumber = value;
+        return this;
+      }
+
+      public InvoiceInfoBuilder notes(String value) {
+        this.notes = value;
+        return this;
+      }
+
+      public InvoiceInfoParams build() {
+        return new InvoiceInfoParams(this);
+      }
+    }
+  }
+
+  public static final class PaymentScheduleParams {
+
+    private final String schemeId;
+
+    private final Long amount;
+
+    private PaymentScheduleParams(PaymentScheduleBuilder builder) {
+
+      this.schemeId = builder.schemeId;
+
+      this.amount = builder.amount;
+    }
+
+    public String getSchemeId() {
+      return schemeId;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.schemeId != null) {
+
+        formData.put("scheme_id", this.schemeId);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentScheduleParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentScheduleBuilder builder() {
+      return new PaymentScheduleBuilder();
+    }
+
+    public static final class PaymentScheduleBuilder {
+
+      private String schemeId;
+
+      private Long amount;
+
+      private PaymentScheduleBuilder() {}
+
+      public PaymentScheduleBuilder schemeId(String value) {
+        this.schemeId = value;
+        return this;
+      }
+
+      public PaymentScheduleBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public PaymentScheduleParams build() {
+        return new PaymentScheduleParams(this);
+      }
+    }
+  }
+
+  public static final class StatementDescriptorParams {
+
+    private final String descriptor;
+
+    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
+
+      this.descriptor = builder.descriptor;
+    }
+
+    public String getDescriptor() {
+      return descriptor;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.descriptor != null) {
+
+        formData.put("descriptor", this.descriptor);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatementDescriptorParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatementDescriptorBuilder builder() {
+      return new StatementDescriptorBuilder();
+    }
+
+    public static final class StatementDescriptorBuilder {
+
+      private String descriptor;
+
+      private StatementDescriptorBuilder() {}
+
+      public StatementDescriptorBuilder descriptor(String value) {
+        this.descriptor = value;
+        return this;
+      }
+
+      public StatementDescriptorParams build() {
+        return new StatementDescriptorParams(this);
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PurchaseItemsParams {
+
+    private final Integer index;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final Integer unitAmount;
+
+    private final String unitAmountInDecimal;
+
+    private final String quantityInDecimal;
+
+    private PurchaseItemsParams(PurchaseItemsBuilder builder) {
+
+      this.index = builder.index;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.unitAmount = builder.unitAmount;
+
+      this.unitAmountInDecimal = builder.unitAmountInDecimal;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+    }
+
+    public Integer getIndex() {
+      return index;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Integer getUnitAmount() {
+      return unitAmount;
+    }
+
+    public String getUnitAmountInDecimal() {
+      return unitAmountInDecimal;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.index != null) {
+
+        formData.put("index", this.index);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitAmount != null) {
+
+        formData.put("unit_amount", this.unitAmount);
+      }
+
+      if (this.unitAmountInDecimal != null) {
+
+        formData.put("unit_amount_in_decimal", this.unitAmountInDecimal);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PurchaseItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PurchaseItemsBuilder builder() {
+      return new PurchaseItemsBuilder();
+    }
+
+    public static final class PurchaseItemsBuilder {
+
+      private Integer index;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private Integer unitAmount;
+
+      private String unitAmountInDecimal;
+
+      private String quantityInDecimal;
+
+      private PurchaseItemsBuilder() {}
+
+      public PurchaseItemsBuilder index(Integer value) {
+        this.index = value;
+        return this;
+      }
+
+      public PurchaseItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public PurchaseItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public PurchaseItemsBuilder unitAmount(Integer value) {
+        this.unitAmount = value;
+        return this;
+      }
+
+      public PurchaseItemsBuilder unitAmountInDecimal(String value) {
+        this.unitAmountInDecimal = value;
+        return this;
+      }
+
+      public PurchaseItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public PurchaseItemsParams build() {
+        return new PurchaseItemsParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final Integer index;
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.index = builder.index;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+    }
+
+    public Integer getIndex() {
+      return index;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.index != null) {
+
+        formData.put("index", this.index);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private Integer index;
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder index(Integer value) {
+        this.index = value;
+        return this;
+      }
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+  }
+
+  public static final class ShippingAddressesParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String state;
+
+    private final String stateCode;
+
+    private final String country;
+
+    private final String zip;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressesParams(ShippingAddressesBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.state = builder.state;
+
+      this.stateCode = builder.stateCode;
+
+      this.country = builder.country;
+
+      this.zip = builder.zip;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressesBuilder builder() {
+      return new ShippingAddressesBuilder();
+    }
+
+    public static final class ShippingAddressesBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String state;
+
+      private String stateCode;
+
+      private String country;
+
+      private String zip;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressesBuilder() {}
+
+      public ShippingAddressesBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressesParams build() {
+        return new ShippingAddressesParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final Integer index;
+
+    private final String couponId;
+
+    private final Number percentage;
+
+    private final Integer quantity;
+
+    private final Long amount;
+
+    private final Boolean includedInMrr;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.index = builder.index;
+
+      this.couponId = builder.couponId;
+
+      this.percentage = builder.percentage;
+
+      this.quantity = builder.quantity;
+
+      this.amount = builder.amount;
+
+      this.includedInMrr = builder.includedInMrr;
+    }
+
+    public Integer getIndex() {
+      return index;
+    }
+
+    public String getCouponId() {
+      return couponId;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.index != null) {
+
+        formData.put("index", this.index);
+      }
+
+      if (this.couponId != null) {
+
+        formData.put("coupon_id", this.couponId);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private Integer index;
+
+      private String couponId;
+
+      private Number percentage;
+
+      private Integer quantity;
+
+      private Long amount;
+
+      private Boolean includedInMrr;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder index(Integer value) {
+        this.index = value;
+        return this;
+      }
+
+      public DiscountsBuilder couponId(String value) {
+        this.couponId = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionInfoParams {
+
+    private final Integer index;
+
+    private final String subscriptionId;
+
+    private final Integer billingCycles;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private final java.util.Map<String, Object> metaData;
+
+    private SubscriptionInfoParams(SubscriptionInfoBuilder builder) {
+
+      this.index = builder.index;
+
+      this.subscriptionId = builder.subscriptionId;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+      this.metaData = builder.metaData;
+    }
+
+    public Integer getIndex() {
+      return index;
+    }
+
+    public String getSubscriptionId() {
+      return subscriptionId;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    public java.util.Map<String, Object> getMetaData() {
+      return metaData;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.index != null) {
+
+        formData.put("index", this.index);
+      }
+
+      if (this.subscriptionId != null) {
+
+        formData.put("subscription_id", this.subscriptionId);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      if (this.metaData != null) {
+
+        formData.put("meta_data", JsonUtil.toJson(this.metaData));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionInfoParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionInfoBuilder builder() {
+      return new SubscriptionInfoBuilder();
+    }
+
+    public static final class SubscriptionInfoBuilder {
+
+      private Integer index;
+
+      private String subscriptionId;
+
+      private Integer billingCycles;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private java.util.Map<String, Object> metaData;
+
+      private SubscriptionInfoBuilder() {}
+
+      public SubscriptionInfoBuilder index(Integer value) {
+        this.index = value;
+        return this;
+      }
+
+      public SubscriptionInfoBuilder subscriptionId(String value) {
+        this.subscriptionId = value;
+        return this;
+      }
+
+      public SubscriptionInfoBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionInfoBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionInfoBuilder metaData(java.util.Map<String, Object> value) {
+        this.metaData = value;
+        return this;
+      }
+
+      public SubscriptionInfoParams build() {
+        return new SubscriptionInfoParams(this);
+      }
+    }
+  }
+
+  public static final class ContractTermsParams {
+
+    private final Integer index;
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermsParams(ContractTermsBuilder builder) {
+
+      this.index = builder.index;
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public Integer getIndex() {
+      return index;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.index != null) {
+
+        formData.put("index", this.index);
+      }
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermsBuilder builder() {
+      return new ContractTermsBuilder();
+    }
+
+    public static final class ContractTermsBuilder {
+
+      private Integer index;
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermsBuilder() {}
+
+      public ContractTermsBuilder index(Integer value) {
+        this.index = value;
+        return this;
+      }
+
+      public ContractTermsBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermsBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermsParams build() {
+        return new ContractTermsParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/purchase/params/PurchaseEstimateParams.java b/src/main/java/com/chargebee/v4/models/purchase/params/PurchaseEstimateParams.java
new file mode 100644
index 00000000..97327d73
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/purchase/params/PurchaseEstimateParams.java
@@ -0,0 +1,1895 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.purchase.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class PurchaseEstimateParams {
+
+  private final String clientProfileId;
+
+  private final String customerId;
+
+  private final CustomerParams customer;
+
+  private final BillingAddressParams billingAddress;
+
+  private final List<PurchaseItemsParams> purchaseItems;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<ShippingAddressesParams> shippingAddresses;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<SubscriptionInfoParams> subscriptionInfo;
+
+  private final List<ContractTermsParams> contractTerms;
+
+  private PurchaseEstimateParams(PurchaseEstimateBuilder builder) {
+
+    this.clientProfileId = builder.clientProfileId;
+
+    this.customerId = builder.customerId;
+
+    this.customer = builder.customer;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.purchaseItems = builder.purchaseItems;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.shippingAddresses = builder.shippingAddresses;
+
+    this.discounts = builder.discounts;
+
+    this.subscriptionInfo = builder.subscriptionInfo;
+
+    this.contractTerms = builder.contractTerms;
+  }
+
+  public String getClientProfileId() {
+    return clientProfileId;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public List<PurchaseItemsParams> getPurchaseItems() {
+    return purchaseItems;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<ShippingAddressesParams> getShippingAddresses() {
+    return shippingAddresses;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<SubscriptionInfoParams> getSubscriptionInfo() {
+    return subscriptionInfo;
+  }
+
+  public List<ContractTermsParams> getContractTerms() {
+    return contractTerms;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.clientProfileId != null) {
+
+      formData.put("client_profile_id", this.clientProfileId);
+    }
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.purchaseItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.purchaseItems.size(); i++) {
+        PurchaseItemsParams item = this.purchaseItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "purchase_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.shippingAddresses != null) {
+
+      // List of objects
+      for (int i = 0; i < this.shippingAddresses.size(); i++) {
+        ShippingAddressesParams item = this.shippingAddresses.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "shipping_addresses[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.subscriptionInfo != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionInfo.size(); i++) {
+        SubscriptionInfoParams item = this.subscriptionInfo.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_info[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.contractTerms != null) {
+
+      // List of objects
+      for (int i = 0; i < this.contractTerms.size(); i++) {
+        ContractTermsParams item = this.contractTerms.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "contract_terms[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for PurchaseEstimateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static PurchaseEstimateBuilder builder() {
+    return new PurchaseEstimateBuilder();
+  }
+
+  public static final class PurchaseEstimateBuilder {
+
+    private String clientProfileId;
+
+    private String customerId;
+
+    private CustomerParams customer;
+
+    private BillingAddressParams billingAddress;
+
+    private List<PurchaseItemsParams> purchaseItems;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<ShippingAddressesParams> shippingAddresses;
+
+    private List<DiscountsParams> discounts;
+
+    private List<SubscriptionInfoParams> subscriptionInfo;
+
+    private List<ContractTermsParams> contractTerms;
+
+    private PurchaseEstimateBuilder() {}
+
+    public PurchaseEstimateBuilder clientProfileId(String value) {
+      this.clientProfileId = value;
+      return this;
+    }
+
+    public PurchaseEstimateBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public PurchaseEstimateBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public PurchaseEstimateBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public PurchaseEstimateBuilder purchaseItems(List<PurchaseItemsParams> value) {
+      this.purchaseItems = value;
+      return this;
+    }
+
+    public PurchaseEstimateBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public PurchaseEstimateBuilder shippingAddresses(List<ShippingAddressesParams> value) {
+      this.shippingAddresses = value;
+      return this;
+    }
+
+    public PurchaseEstimateBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public PurchaseEstimateBuilder subscriptionInfo(List<SubscriptionInfoParams> value) {
+      this.subscriptionInfo = value;
+      return this;
+    }
+
+    public PurchaseEstimateBuilder contractTerms(List<ContractTermsParams> value) {
+      this.contractTerms = value;
+      return this;
+    }
+
+    public PurchaseEstimateParams build() {
+      return new PurchaseEstimateParams(this);
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final Boolean registeredForGst;
+
+    private final Taxability taxability;
+
+    private final EntityCode entityCode;
+
+    private final String exemptNumber;
+
+    private final List<Object> exemptionDetails;
+
+    private final CustomerType customerType;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.registeredForGst = builder.registeredForGst;
+
+      this.taxability = builder.taxability;
+
+      this.entityCode = builder.entityCode;
+
+      this.exemptNumber = builder.exemptNumber;
+
+      this.exemptionDetails = builder.exemptionDetails;
+
+      this.customerType = builder.customerType;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public Boolean getRegisteredForGst() {
+      return registeredForGst;
+    }
+
+    public Taxability getTaxability() {
+      return taxability;
+    }
+
+    public EntityCode getEntityCode() {
+      return entityCode;
+    }
+
+    public String getExemptNumber() {
+      return exemptNumber;
+    }
+
+    public List<Object> getExemptionDetails() {
+      return exemptionDetails;
+    }
+
+    public CustomerType getCustomerType() {
+      return customerType;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.registeredForGst != null) {
+
+        formData.put("registered_for_gst", this.registeredForGst);
+      }
+
+      if (this.taxability != null) {
+
+        formData.put("taxability", this.taxability);
+      }
+
+      if (this.entityCode != null) {
+
+        formData.put("entity_code", this.entityCode);
+      }
+
+      if (this.exemptNumber != null) {
+
+        formData.put("exempt_number", this.exemptNumber);
+      }
+
+      if (this.exemptionDetails != null) {
+
+        formData.put("exemption_details", JsonUtil.toJson(this.exemptionDetails));
+      }
+
+      if (this.customerType != null) {
+
+        formData.put("customer_type", this.customerType);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private Boolean registeredForGst;
+
+      private Taxability taxability;
+
+      private EntityCode entityCode;
+
+      private String exemptNumber;
+
+      private List<Object> exemptionDetails;
+
+      private CustomerType customerType;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder registeredForGst(Boolean value) {
+        this.registeredForGst = value;
+        return this;
+      }
+
+      public CustomerBuilder taxability(Taxability value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerBuilder entityCode(EntityCode value) {
+        this.entityCode = value;
+        return this;
+      }
+
+      public CustomerBuilder exemptNumber(String value) {
+        this.exemptNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder exemptionDetails(List<Object> value) {
+        this.exemptionDetails = value;
+        return this;
+      }
+
+      public CustomerBuilder customerType(CustomerType value) {
+        this.customerType = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+
+    public enum Taxability {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Taxability was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Taxability(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Taxability fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Taxability enumValue : Taxability.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum EntityCode {
+      A("a"),
+
+      B("b"),
+
+      C("c"),
+
+      D("d"),
+
+      E("e"),
+
+      F("f"),
+
+      G("g"),
+
+      H("h"),
+
+      I("i"),
+
+      J("j"),
+
+      K("k"),
+
+      L("l"),
+
+      M("m"),
+
+      N("n"),
+
+      P("p"),
+
+      Q("q"),
+
+      R("r"),
+
+      MED_1("med1"),
+
+      MED_2("med2"),
+
+      /** An enum member indicating that EntityCode was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityCode(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityCode fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityCode enumValue : EntityCode.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum CustomerType {
+      RESIDENTIAL("residential"),
+
+      BUSINESS("business"),
+
+      SENIOR_CITIZEN("senior_citizen"),
+
+      INDUSTRIAL("industrial"),
+
+      /** An enum member indicating that CustomerType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      CustomerType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static CustomerType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (CustomerType enumValue : CustomerType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PurchaseItemsParams {
+
+    private final Integer index;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final Integer unitAmount;
+
+    private final String unitAmountInDecimal;
+
+    private final String quantityInDecimal;
+
+    private PurchaseItemsParams(PurchaseItemsBuilder builder) {
+
+      this.index = builder.index;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.unitAmount = builder.unitAmount;
+
+      this.unitAmountInDecimal = builder.unitAmountInDecimal;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+    }
+
+    public Integer getIndex() {
+      return index;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Integer getUnitAmount() {
+      return unitAmount;
+    }
+
+    public String getUnitAmountInDecimal() {
+      return unitAmountInDecimal;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.index != null) {
+
+        formData.put("index", this.index);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitAmount != null) {
+
+        formData.put("unit_amount", this.unitAmount);
+      }
+
+      if (this.unitAmountInDecimal != null) {
+
+        formData.put("unit_amount_in_decimal", this.unitAmountInDecimal);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PurchaseItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PurchaseItemsBuilder builder() {
+      return new PurchaseItemsBuilder();
+    }
+
+    public static final class PurchaseItemsBuilder {
+
+      private Integer index;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private Integer unitAmount;
+
+      private String unitAmountInDecimal;
+
+      private String quantityInDecimal;
+
+      private PurchaseItemsBuilder() {}
+
+      public PurchaseItemsBuilder index(Integer value) {
+        this.index = value;
+        return this;
+      }
+
+      public PurchaseItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public PurchaseItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public PurchaseItemsBuilder unitAmount(Integer value) {
+        this.unitAmount = value;
+        return this;
+      }
+
+      public PurchaseItemsBuilder unitAmountInDecimal(String value) {
+        this.unitAmountInDecimal = value;
+        return this;
+      }
+
+      public PurchaseItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public PurchaseItemsParams build() {
+        return new PurchaseItemsParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final Integer index;
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.index = builder.index;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+    }
+
+    public Integer getIndex() {
+      return index;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.index != null) {
+
+        formData.put("index", this.index);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private Integer index;
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder index(Integer value) {
+        this.index = value;
+        return this;
+      }
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+  }
+
+  public static final class ShippingAddressesParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String state;
+
+    private final String stateCode;
+
+    private final String country;
+
+    private final String zip;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressesParams(ShippingAddressesBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.state = builder.state;
+
+      this.stateCode = builder.stateCode;
+
+      this.country = builder.country;
+
+      this.zip = builder.zip;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressesBuilder builder() {
+      return new ShippingAddressesBuilder();
+    }
+
+    public static final class ShippingAddressesBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String state;
+
+      private String stateCode;
+
+      private String country;
+
+      private String zip;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressesBuilder() {}
+
+      public ShippingAddressesBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressesBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressesParams build() {
+        return new ShippingAddressesParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final Integer index;
+
+    private final String couponId;
+
+    private final Number percentage;
+
+    private final Integer quantity;
+
+    private final Long amount;
+
+    private final Boolean includedInMrr;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.index = builder.index;
+
+      this.couponId = builder.couponId;
+
+      this.percentage = builder.percentage;
+
+      this.quantity = builder.quantity;
+
+      this.amount = builder.amount;
+
+      this.includedInMrr = builder.includedInMrr;
+    }
+
+    public Integer getIndex() {
+      return index;
+    }
+
+    public String getCouponId() {
+      return couponId;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.index != null) {
+
+        formData.put("index", this.index);
+      }
+
+      if (this.couponId != null) {
+
+        formData.put("coupon_id", this.couponId);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private Integer index;
+
+      private String couponId;
+
+      private Number percentage;
+
+      private Integer quantity;
+
+      private Long amount;
+
+      private Boolean includedInMrr;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder index(Integer value) {
+        this.index = value;
+        return this;
+      }
+
+      public DiscountsBuilder couponId(String value) {
+        this.couponId = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionInfoParams {
+
+    private final Integer index;
+
+    private final String subscriptionId;
+
+    private final Integer billingCycles;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private SubscriptionInfoParams(SubscriptionInfoBuilder builder) {
+
+      this.index = builder.index;
+
+      this.subscriptionId = builder.subscriptionId;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+    }
+
+    public Integer getIndex() {
+      return index;
+    }
+
+    public String getSubscriptionId() {
+      return subscriptionId;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.index != null) {
+
+        formData.put("index", this.index);
+      }
+
+      if (this.subscriptionId != null) {
+
+        formData.put("subscription_id", this.subscriptionId);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionInfoParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionInfoBuilder builder() {
+      return new SubscriptionInfoBuilder();
+    }
+
+    public static final class SubscriptionInfoBuilder {
+
+      private Integer index;
+
+      private String subscriptionId;
+
+      private Integer billingCycles;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private SubscriptionInfoBuilder() {}
+
+      public SubscriptionInfoBuilder index(Integer value) {
+        this.index = value;
+        return this;
+      }
+
+      public SubscriptionInfoBuilder subscriptionId(String value) {
+        this.subscriptionId = value;
+        return this;
+      }
+
+      public SubscriptionInfoBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionInfoBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionInfoParams build() {
+        return new SubscriptionInfoParams(this);
+      }
+    }
+  }
+
+  public static final class ContractTermsParams {
+
+    private final Integer index;
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermsParams(ContractTermsBuilder builder) {
+
+      this.index = builder.index;
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public Integer getIndex() {
+      return index;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.index != null) {
+
+        formData.put("index", this.index);
+      }
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermsBuilder builder() {
+      return new ContractTermsBuilder();
+    }
+
+    public static final class ContractTermsBuilder {
+
+      private Integer index;
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermsBuilder() {}
+
+      public ContractTermsBuilder index(Integer value) {
+        this.index = value;
+        return this;
+      }
+
+      public ContractTermsBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermsBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermsParams build() {
+        return new ContractTermsParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/purchase/PurchaseCreateResponse.java b/src/main/java/com/chargebee/v4/models/purchase/responses/PurchaseCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/purchase/PurchaseCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/purchase/responses/PurchaseCreateResponse.java
index 515cd16f..d508aa9d 100644
--- a/src/main/java/com/chargebee/v4/core/responses/purchase/PurchaseCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/purchase/responses/PurchaseCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.purchase;
+package com.chargebee.v4.models.purchase.responses;
 
-import com.chargebee.v4.core.models.purchase.Purchase;
+import com.chargebee.v4.models.purchase.Purchase;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/purchase/PurchaseEstimateResponse.java b/src/main/java/com/chargebee/v4/models/purchase/responses/PurchaseEstimateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/purchase/PurchaseEstimateResponse.java
rename to src/main/java/com/chargebee/v4/models/purchase/responses/PurchaseEstimateResponse.java
index f59fe530..c459c299 100644
--- a/src/main/java/com/chargebee/v4/core/responses/purchase/PurchaseEstimateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/purchase/responses/PurchaseEstimateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.purchase;
+package com.chargebee.v4.models.purchase.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/Quote.java b/src/main/java/com/chargebee/v4/models/quote/Quote.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/quote/Quote.java
rename to src/main/java/com/chargebee/v4/models/quote/Quote.java
index ca4f3567..45a575c5 100644
--- a/src/main/java/com/chargebee/v4/core/models/quote/Quote.java
+++ b/src/main/java/com/chargebee/v4/models/quote/Quote.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.quote;
+package com.chargebee.v4.models.quote;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.math.BigDecimal;
@@ -56,7 +56,7 @@ public class Quote {
   private ShippingAddress shippingAddress;
   private BillingAddress billingAddress;
 
-  private java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+  private java.util.Map<String, String> customFields = new java.util.HashMap<>();
 
   public String getId() {
     return id;
@@ -228,7 +228,7 @@ public BillingAddress getBillingAddress() {
    *
    * @return map containing all custom fields
    */
-  public java.util.Map<String, Object> getCustomFields() {
+  public java.util.Map<String, String> getCustomFields() {
     return customFields;
   }
 
@@ -238,7 +238,7 @@ public java.util.Map<String, Object> getCustomFields() {
    * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
    * @return the value of the custom field, or null if not present
    */
-  public Object getCustomField(String fieldName) {
+  public String getCustomField(String fieldName) {
     return customFields.get(fieldName);
   }
 
@@ -349,7 +349,7 @@ public static PriceType fromString(String value) {
   public static Quote fromJson(String json) {
     Quote obj = new Quote();
 
-    // Parse JSON to extract all keys
+    // Parse JSON to extract all keys for custom field extraction
     java.util.Set<String> knownFields = new java.util.HashSet<>();
 
     knownFields.add("id");
@@ -560,9 +560,9 @@ public static Quote fromJson(String json) {
    * @param knownFields set of known field names
    * @return map of custom fields
    */
-  private static java.util.Map<String, Object> extractCustomFields(
+  private static java.util.Map<String, String> extractCustomFields(
       String json, java.util.Set<String> knownFields) {
-    java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+    java.util.Map<String, String> customFields = new java.util.HashMap<>();
     try {
       // Parse the entire JSON as a map
       java.util.Map<String, Object> allFields = JsonUtil.parseJsonObjectToMap(json);
@@ -571,7 +571,8 @@ private static java.util.Map<String, Object> extractCustomFields(
           String key = entry.getKey();
           // Include fields that start with "cf_" and are not in knownFields
           if (key != null && key.startsWith("cf_") && !knownFields.contains(key)) {
-            customFields.put(key, entry.getValue());
+            customFields.put(
+                key, entry.getValue() != null ? String.valueOf(entry.getValue()) : null);
           }
         }
       }
@@ -1240,6 +1241,7 @@ public static class Discounts {
 
     private Long amount;
     private String description;
+    private String lineItemId;
     private EntityType entityType;
     private DiscountType discountType;
     private String entityId;
@@ -1253,6 +1255,10 @@ public String getDescription() {
       return description;
     }
 
+    public String getLineItemId() {
+      return lineItemId;
+    }
+
     public EntityType getEntityType() {
       return entityType;
     }
@@ -1340,6 +1346,8 @@ public static Discounts fromJson(String json) {
 
       obj.description = JsonUtil.getString(json, "description");
 
+      obj.lineItemId = JsonUtil.getString(json, "line_item_id");
+
       obj.entityType = EntityType.fromString(JsonUtil.getString(json, "entity_type"));
 
       obj.discountType = DiscountType.fromString(JsonUtil.getString(json, "discount_type"));
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/CreateSubscriptionForCustomerQuoteParams.java b/src/main/java/com/chargebee/v4/models/quote/params/CreateSubscriptionForCustomerQuoteParams.java
new file mode 100644
index 00000000..810f7c00
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/CreateSubscriptionForCustomerQuoteParams.java
@@ -0,0 +1,1567 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class CreateSubscriptionForCustomerQuoteParams {
+
+  private final String name;
+
+  private final String notes;
+
+  private final Timestamp expiresAt;
+
+  private final Integer billingCycles;
+
+  private final List<String> mandatoryAddonsToRemove;
+
+  private final Integer termsToCharge;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final SubscriptionParams subscription;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<AddonsParams> addons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private CreateSubscriptionForCustomerQuoteParams(
+      CreateSubscriptionForCustomerQuoteBuilder builder) {
+
+    this.name = builder.name;
+
+    this.notes = builder.notes;
+
+    this.expiresAt = builder.expiresAt;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.mandatoryAddonsToRemove = builder.mandatoryAddonsToRemove;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.subscription = builder.subscription;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.addons = builder.addons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getNotes() {
+    return notes;
+  }
+
+  public Timestamp getExpiresAt() {
+    return expiresAt;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public List<String> getMandatoryAddonsToRemove() {
+    return mandatoryAddonsToRemove;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.notes != null) {
+
+      formData.put("notes", this.notes);
+    }
+
+    if (this.expiresAt != null) {
+
+      formData.put("expires_at", this.expiresAt);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.mandatoryAddonsToRemove != null) {
+
+      formData.put("mandatory_addons_to_remove", this.mandatoryAddonsToRemove);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CreateSubscriptionForCustomerQuoteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreateSubscriptionForCustomerQuoteBuilder builder() {
+    return new CreateSubscriptionForCustomerQuoteBuilder();
+  }
+
+  public static final class CreateSubscriptionForCustomerQuoteBuilder {
+
+    private String name;
+
+    private String notes;
+
+    private Timestamp expiresAt;
+
+    private Integer billingCycles;
+
+    private List<String> mandatoryAddonsToRemove;
+
+    private Integer termsToCharge;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private SubscriptionParams subscription;
+
+    private ShippingAddressParams shippingAddress;
+
+    private ContractTermParams contractTerm;
+
+    private List<AddonsParams> addons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private CreateSubscriptionForCustomerQuoteBuilder() {}
+
+    public CreateSubscriptionForCustomerQuoteBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteBuilder notes(String value) {
+      this.notes = value;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteBuilder expiresAt(Timestamp value) {
+      this.expiresAt = value;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteBuilder mandatoryAddonsToRemove(List<String> value) {
+      this.mandatoryAddonsToRemove = value;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteBuilder billingAlignmentMode(
+        BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteBuilder eventBasedAddons(
+        List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteParams build() {
+      return new CreateSubscriptionForCustomerQuoteParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final String poNumber;
+
+    private final String planId;
+
+    private final Integer planQuantity;
+
+    private final String planQuantityInDecimal;
+
+    private final Long planUnitPrice;
+
+    private final String planUnitPriceInDecimal;
+
+    private final Long setupFee;
+
+    private final Timestamp trialEnd;
+
+    private final Timestamp startDate;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.poNumber = builder.poNumber;
+
+      this.planId = builder.planId;
+
+      this.planQuantity = builder.planQuantity;
+
+      this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+      this.planUnitPrice = builder.planUnitPrice;
+
+      this.planUnitPriceInDecimal = builder.planUnitPriceInDecimal;
+
+      this.setupFee = builder.setupFee;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.startDate = builder.startDate;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getPoNumber() {
+      return poNumber;
+    }
+
+    public String getPlanId() {
+      return planId;
+    }
+
+    public Integer getPlanQuantity() {
+      return planQuantity;
+    }
+
+    public String getPlanQuantityInDecimal() {
+      return planQuantityInDecimal;
+    }
+
+    public Long getPlanUnitPrice() {
+      return planUnitPrice;
+    }
+
+    public String getPlanUnitPriceInDecimal() {
+      return planUnitPriceInDecimal;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.poNumber != null) {
+
+        formData.put("po_number", this.poNumber);
+      }
+
+      if (this.planId != null) {
+
+        formData.put("plan_id", this.planId);
+      }
+
+      if (this.planQuantity != null) {
+
+        formData.put("plan_quantity", this.planQuantity);
+      }
+
+      if (this.planQuantityInDecimal != null) {
+
+        formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+      }
+
+      if (this.planUnitPrice != null) {
+
+        formData.put("plan_unit_price", this.planUnitPrice);
+      }
+
+      if (this.planUnitPriceInDecimal != null) {
+
+        formData.put("plan_unit_price_in_decimal", this.planUnitPriceInDecimal);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private String poNumber;
+
+      private String planId;
+
+      private Integer planQuantity;
+
+      private String planQuantityInDecimal;
+
+      private Long planUnitPrice;
+
+      private String planUnitPriceInDecimal;
+
+      private Long setupFee;
+
+      private Timestamp trialEnd;
+
+      private Timestamp startDate;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder poNumber(String value) {
+        this.poNumber = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planId(String value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantity(Integer value) {
+        this.planQuantity = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantityInDecimal(String value) {
+        this.planQuantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPrice(Long value) {
+        this.planUnitPrice = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
+        this.planUnitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AddonsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriodInDays;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOn chargeOn;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOn = builder.chargeOn;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOn getChargeOn() {
+      return chargeOn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOn != null) {
+
+        formData.put("charge_on", this.chargeOn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriodInDays;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOn chargeOn;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
+        this.chargeOn = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOn {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOn enumValue : ChargeOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/CreateSubscriptionItemsForCustomerQuoteParams.java b/src/main/java/com/chargebee/v4/models/quote/params/CreateSubscriptionItemsForCustomerQuoteParams.java
new file mode 100644
index 00000000..df6d21e5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/CreateSubscriptionItemsForCustomerQuoteParams.java
@@ -0,0 +1,2685 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class CreateSubscriptionItemsForCustomerQuoteParams {
+
+  private final String name;
+
+  private final String notes;
+
+  private final Timestamp expiresAt;
+
+  private final Integer billingCycles;
+
+  private final List<String> mandatoryItemsToRemove;
+
+  private final Integer termsToCharge;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final BillingStartOption billingStartOption;
+
+  private final Integer netTermDays;
+
+  private final SubscriptionParams subscription;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final ContractTermParams contractTerm;
+
+  private final BillingAddressParams billingAddress;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<CouponsParams> coupons;
+
+  private final Map<String, String> customFields;
+
+  private CreateSubscriptionItemsForCustomerQuoteParams(
+      CreateSubscriptionItemsForCustomerQuoteBuilder builder) {
+
+    this.name = builder.name;
+
+    this.notes = builder.notes;
+
+    this.expiresAt = builder.expiresAt;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.mandatoryItemsToRemove = builder.mandatoryItemsToRemove;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.billingStartOption = builder.billingStartOption;
+
+    this.netTermDays = builder.netTermDays;
+
+    this.subscription = builder.subscription;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.discounts = builder.discounts;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.coupons = builder.coupons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getNotes() {
+    return notes;
+  }
+
+  public Timestamp getExpiresAt() {
+    return expiresAt;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public List<String> getMandatoryItemsToRemove() {
+    return mandatoryItemsToRemove;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public BillingStartOption getBillingStartOption() {
+    return billingStartOption;
+  }
+
+  public Integer getNetTermDays() {
+    return netTermDays;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<CouponsParams> getCoupons() {
+    return coupons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.notes != null) {
+
+      formData.put("notes", this.notes);
+    }
+
+    if (this.expiresAt != null) {
+
+      formData.put("expires_at", this.expiresAt);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.mandatoryItemsToRemove != null) {
+
+      formData.put("mandatory_items_to_remove", this.mandatoryItemsToRemove);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.billingStartOption != null) {
+
+      formData.put("billing_start_option", this.billingStartOption);
+    }
+
+    if (this.netTermDays != null) {
+
+      formData.put("net_term_days", this.netTermDays);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.coupons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.coupons.size(); i++) {
+        CouponsParams item = this.coupons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for CreateSubscriptionItemsForCustomerQuoteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreateSubscriptionItemsForCustomerQuoteBuilder builder() {
+    return new CreateSubscriptionItemsForCustomerQuoteBuilder();
+  }
+
+  public static final class CreateSubscriptionItemsForCustomerQuoteBuilder {
+
+    private String name;
+
+    private String notes;
+
+    private Timestamp expiresAt;
+
+    private Integer billingCycles;
+
+    private List<String> mandatoryItemsToRemove;
+
+    private Integer termsToCharge;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private BillingStartOption billingStartOption;
+
+    private Integer netTermDays;
+
+    private SubscriptionParams subscription;
+
+    private ShippingAddressParams shippingAddress;
+
+    private ContractTermParams contractTerm;
+
+    private BillingAddressParams billingAddress;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<DiscountsParams> discounts;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<CouponsParams> coupons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private CreateSubscriptionItemsForCustomerQuoteBuilder() {}
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder notes(String value) {
+      this.notes = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder expiresAt(Timestamp value) {
+      this.expiresAt = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder mandatoryItemsToRemove(
+        List<String> value) {
+      this.mandatoryItemsToRemove = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder billingAlignmentMode(
+        BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder billingStartOption(
+        BillingStartOption value) {
+      this.billingStartOption = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder netTermDays(Integer value) {
+      this.netTermDays = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder shippingAddress(
+        ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder billingAddress(
+        BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteBuilder coupons(List<CouponsParams> value) {
+      this.coupons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public CreateSubscriptionItemsForCustomerQuoteBuilder customField(
+        String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public CreateSubscriptionItemsForCustomerQuoteBuilder customFields(
+        Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteParams build() {
+      return new CreateSubscriptionItemsForCustomerQuoteParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum BillingStartOption {
+    IMMEDIATELY("immediately"),
+
+    ON_SPECIFIC_DATE("on_specific_date"),
+
+    /** An enum member indicating that BillingStartOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingStartOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingStartOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingStartOption enumValue : BillingStartOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final String poNumber;
+
+    private final Timestamp trialEnd;
+
+    private final Long setupFee;
+
+    private final Timestamp startDate;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.poNumber = builder.poNumber;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.setupFee = builder.setupFee;
+
+      this.startDate = builder.startDate;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getPoNumber() {
+      return poNumber;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.poNumber != null) {
+
+        formData.put("po_number", this.poNumber);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private String poNumber;
+
+      private Timestamp trialEnd;
+
+      private Long setupFee;
+
+      private Timestamp startDate;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder poNumber(String value) {
+        this.poNumber = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ItemType itemType;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private final Timestamp startDate;
+
+    private final Timestamp endDate;
+
+    private final String rampTierId;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.itemType = builder.itemType;
+
+      this.chargeOnOption = builder.chargeOnOption;
+
+      this.startDate = builder.startDate;
+
+      this.endDate = builder.endDate;
+
+      this.rampTierId = builder.rampTierId;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    public String getRampTierId() {
+      return rampTierId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      if (this.rampTierId != null) {
+
+        formData.put("ramp_tier_id", this.rampTierId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ItemType itemType;
+
+      private ChargeOnOption chargeOnOption;
+
+      private Timestamp startDate;
+
+      private Timestamp endDate;
+
+      private String rampTierId;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder rampTierId(String value) {
+        this.rampTierId = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final Timestamp startDate;
+
+    private final Timestamp endDate;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.startDate = builder.startDate;
+
+      this.endDate = builder.endDate;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private Timestamp startDate;
+
+      private Timestamp endDate;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public DiscountsBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private final String rampTierId;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+
+      this.rampTierId = builder.rampTierId;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    public String getRampTierId() {
+      return rampTierId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      if (this.rampTierId != null) {
+
+        formData.put("ramp_tier_id", this.rampTierId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private String rampTierId;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersBuilder rampTierId(String value) {
+        this.rampTierId = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponsParams {
+
+    private final String id;
+
+    private final Timestamp startDate;
+
+    private final Timestamp endDate;
+
+    private CouponsParams(CouponsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.startDate = builder.startDate;
+
+      this.endDate = builder.endDate;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsBuilder builder() {
+      return new CouponsBuilder();
+    }
+
+    public static final class CouponsBuilder {
+
+      private String id;
+
+      private Timestamp startDate;
+
+      private Timestamp endDate;
+
+      private CouponsBuilder() {}
+
+      public CouponsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CouponsBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public CouponsBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public CouponsParams build() {
+        return new CouponsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/EditCreateSubscriptionCustomerQuoteForItemsParams.java b/src/main/java/com/chargebee/v4/models/quote/params/EditCreateSubscriptionCustomerQuoteForItemsParams.java
new file mode 100644
index 00000000..26e467b5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/EditCreateSubscriptionCustomerQuoteForItemsParams.java
@@ -0,0 +1,2669 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EditCreateSubscriptionCustomerQuoteForItemsParams {
+
+  private final String notes;
+
+  private final Timestamp expiresAt;
+
+  private final Integer billingCycles;
+
+  private final List<String> mandatoryItemsToRemove;
+
+  private final Integer termsToCharge;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final BillingStartOption billingStartOption;
+
+  private final Integer netTermDays;
+
+  private final SubscriptionParams subscription;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final ContractTermParams contractTerm;
+
+  private final BillingAddressParams billingAddress;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<CouponsParams> coupons;
+
+  private final Map<String, String> customFields;
+
+  private EditCreateSubscriptionCustomerQuoteForItemsParams(
+      EditCreateSubscriptionCustomerQuoteForItemsBuilder builder) {
+
+    this.notes = builder.notes;
+
+    this.expiresAt = builder.expiresAt;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.mandatoryItemsToRemove = builder.mandatoryItemsToRemove;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.billingStartOption = builder.billingStartOption;
+
+    this.netTermDays = builder.netTermDays;
+
+    this.subscription = builder.subscription;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.discounts = builder.discounts;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.coupons = builder.coupons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getNotes() {
+    return notes;
+  }
+
+  public Timestamp getExpiresAt() {
+    return expiresAt;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public List<String> getMandatoryItemsToRemove() {
+    return mandatoryItemsToRemove;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public BillingStartOption getBillingStartOption() {
+    return billingStartOption;
+  }
+
+  public Integer getNetTermDays() {
+    return netTermDays;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<CouponsParams> getCoupons() {
+    return coupons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.notes != null) {
+
+      formData.put("notes", this.notes);
+    }
+
+    if (this.expiresAt != null) {
+
+      formData.put("expires_at", this.expiresAt);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.mandatoryItemsToRemove != null) {
+
+      formData.put("mandatory_items_to_remove", this.mandatoryItemsToRemove);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.billingStartOption != null) {
+
+      formData.put("billing_start_option", this.billingStartOption);
+    }
+
+    if (this.netTermDays != null) {
+
+      formData.put("net_term_days", this.netTermDays);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.coupons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.coupons.size(); i++) {
+        CouponsParams item = this.coupons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for EditCreateSubscriptionCustomerQuoteForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EditCreateSubscriptionCustomerQuoteForItemsBuilder builder() {
+    return new EditCreateSubscriptionCustomerQuoteForItemsBuilder();
+  }
+
+  public static final class EditCreateSubscriptionCustomerQuoteForItemsBuilder {
+
+    private String notes;
+
+    private Timestamp expiresAt;
+
+    private Integer billingCycles;
+
+    private List<String> mandatoryItemsToRemove;
+
+    private Integer termsToCharge;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private BillingStartOption billingStartOption;
+
+    private Integer netTermDays;
+
+    private SubscriptionParams subscription;
+
+    private ShippingAddressParams shippingAddress;
+
+    private ContractTermParams contractTerm;
+
+    private BillingAddressParams billingAddress;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<DiscountsParams> discounts;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<CouponsParams> coupons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private EditCreateSubscriptionCustomerQuoteForItemsBuilder() {}
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder notes(String value) {
+      this.notes = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder expiresAt(Timestamp value) {
+      this.expiresAt = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder mandatoryItemsToRemove(
+        List<String> value) {
+      this.mandatoryItemsToRemove = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder billingAlignmentMode(
+        BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder billingStartOption(
+        BillingStartOption value) {
+      this.billingStartOption = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder netTermDays(Integer value) {
+      this.netTermDays = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder subscription(
+        SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder shippingAddress(
+        ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder contractTerm(
+        ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder billingAddress(
+        BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder discounts(
+        List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder itemTiers(
+        List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder coupons(List<CouponsParams> value) {
+      this.coupons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder customField(
+        String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public EditCreateSubscriptionCustomerQuoteForItemsBuilder customFields(
+        Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsParams build() {
+      return new EditCreateSubscriptionCustomerQuoteForItemsParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum BillingStartOption {
+    IMMEDIATELY("immediately"),
+
+    ON_SPECIFIC_DATE("on_specific_date"),
+
+    /** An enum member indicating that BillingStartOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingStartOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingStartOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingStartOption enumValue : BillingStartOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final String poNumber;
+
+    private final Timestamp trialEnd;
+
+    private final Long setupFee;
+
+    private final Timestamp startDate;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.poNumber = builder.poNumber;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.setupFee = builder.setupFee;
+
+      this.startDate = builder.startDate;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getPoNumber() {
+      return poNumber;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.poNumber != null) {
+
+        formData.put("po_number", this.poNumber);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private String poNumber;
+
+      private Timestamp trialEnd;
+
+      private Long setupFee;
+
+      private Timestamp startDate;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder poNumber(String value) {
+        this.poNumber = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ItemType itemType;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private final Timestamp startDate;
+
+    private final Timestamp endDate;
+
+    private final String rampTierId;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.itemType = builder.itemType;
+
+      this.chargeOnOption = builder.chargeOnOption;
+
+      this.startDate = builder.startDate;
+
+      this.endDate = builder.endDate;
+
+      this.rampTierId = builder.rampTierId;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    public String getRampTierId() {
+      return rampTierId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      if (this.rampTierId != null) {
+
+        formData.put("ramp_tier_id", this.rampTierId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ItemType itemType;
+
+      private ChargeOnOption chargeOnOption;
+
+      private Timestamp startDate;
+
+      private Timestamp endDate;
+
+      private String rampTierId;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder rampTierId(String value) {
+        this.rampTierId = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final Timestamp startDate;
+
+    private final Timestamp endDate;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.startDate = builder.startDate;
+
+      this.endDate = builder.endDate;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private Timestamp startDate;
+
+      private Timestamp endDate;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public DiscountsBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private final String rampTierId;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+
+      this.rampTierId = builder.rampTierId;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    public String getRampTierId() {
+      return rampTierId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      if (this.rampTierId != null) {
+
+        formData.put("ramp_tier_id", this.rampTierId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private String rampTierId;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersBuilder rampTierId(String value) {
+        this.rampTierId = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponsParams {
+
+    private final String id;
+
+    private final Timestamp startDate;
+
+    private final Timestamp endDate;
+
+    private CouponsParams(CouponsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.startDate = builder.startDate;
+
+      this.endDate = builder.endDate;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsBuilder builder() {
+      return new CouponsBuilder();
+    }
+
+    public static final class CouponsBuilder {
+
+      private String id;
+
+      private Timestamp startDate;
+
+      private Timestamp endDate;
+
+      private CouponsBuilder() {}
+
+      public CouponsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CouponsBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public CouponsBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public CouponsParams build() {
+        return new CouponsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/EditCreateSubscriptionForCustomerQuoteParams.java b/src/main/java/com/chargebee/v4/models/quote/params/EditCreateSubscriptionForCustomerQuoteParams.java
new file mode 100644
index 00000000..d961d2bf
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/EditCreateSubscriptionForCustomerQuoteParams.java
@@ -0,0 +1,1549 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EditCreateSubscriptionForCustomerQuoteParams {
+
+  private final String notes;
+
+  private final Timestamp expiresAt;
+
+  private final Integer billingCycles;
+
+  private final List<String> mandatoryAddonsToRemove;
+
+  private final Integer termsToCharge;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final SubscriptionParams subscription;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<AddonsParams> addons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private EditCreateSubscriptionForCustomerQuoteParams(
+      EditCreateSubscriptionForCustomerQuoteBuilder builder) {
+
+    this.notes = builder.notes;
+
+    this.expiresAt = builder.expiresAt;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.mandatoryAddonsToRemove = builder.mandatoryAddonsToRemove;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.subscription = builder.subscription;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.addons = builder.addons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+  }
+
+  public String getNotes() {
+    return notes;
+  }
+
+  public Timestamp getExpiresAt() {
+    return expiresAt;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public List<String> getMandatoryAddonsToRemove() {
+    return mandatoryAddonsToRemove;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.notes != null) {
+
+      formData.put("notes", this.notes);
+    }
+
+    if (this.expiresAt != null) {
+
+      formData.put("expires_at", this.expiresAt);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.mandatoryAddonsToRemove != null) {
+
+      formData.put("mandatory_addons_to_remove", this.mandatoryAddonsToRemove);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EditCreateSubscriptionForCustomerQuoteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EditCreateSubscriptionForCustomerQuoteBuilder builder() {
+    return new EditCreateSubscriptionForCustomerQuoteBuilder();
+  }
+
+  public static final class EditCreateSubscriptionForCustomerQuoteBuilder {
+
+    private String notes;
+
+    private Timestamp expiresAt;
+
+    private Integer billingCycles;
+
+    private List<String> mandatoryAddonsToRemove;
+
+    private Integer termsToCharge;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private SubscriptionParams subscription;
+
+    private ShippingAddressParams shippingAddress;
+
+    private ContractTermParams contractTerm;
+
+    private List<AddonsParams> addons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private EditCreateSubscriptionForCustomerQuoteBuilder() {}
+
+    public EditCreateSubscriptionForCustomerQuoteBuilder notes(String value) {
+      this.notes = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionForCustomerQuoteBuilder expiresAt(Timestamp value) {
+      this.expiresAt = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionForCustomerQuoteBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionForCustomerQuoteBuilder mandatoryAddonsToRemove(
+        List<String> value) {
+      this.mandatoryAddonsToRemove = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionForCustomerQuoteBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionForCustomerQuoteBuilder billingAlignmentMode(
+        BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionForCustomerQuoteBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionForCustomerQuoteBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionForCustomerQuoteBuilder shippingAddress(
+        ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionForCustomerQuoteBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionForCustomerQuoteBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionForCustomerQuoteBuilder eventBasedAddons(
+        List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public EditCreateSubscriptionForCustomerQuoteParams build() {
+      return new EditCreateSubscriptionForCustomerQuoteParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final String poNumber;
+
+    private final String planId;
+
+    private final Integer planQuantity;
+
+    private final String planQuantityInDecimal;
+
+    private final Long planUnitPrice;
+
+    private final String planUnitPriceInDecimal;
+
+    private final Long setupFee;
+
+    private final Timestamp trialEnd;
+
+    private final Timestamp startDate;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.poNumber = builder.poNumber;
+
+      this.planId = builder.planId;
+
+      this.planQuantity = builder.planQuantity;
+
+      this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+      this.planUnitPrice = builder.planUnitPrice;
+
+      this.planUnitPriceInDecimal = builder.planUnitPriceInDecimal;
+
+      this.setupFee = builder.setupFee;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.startDate = builder.startDate;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getPoNumber() {
+      return poNumber;
+    }
+
+    public String getPlanId() {
+      return planId;
+    }
+
+    public Integer getPlanQuantity() {
+      return planQuantity;
+    }
+
+    public String getPlanQuantityInDecimal() {
+      return planQuantityInDecimal;
+    }
+
+    public Long getPlanUnitPrice() {
+      return planUnitPrice;
+    }
+
+    public String getPlanUnitPriceInDecimal() {
+      return planUnitPriceInDecimal;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.poNumber != null) {
+
+        formData.put("po_number", this.poNumber);
+      }
+
+      if (this.planId != null) {
+
+        formData.put("plan_id", this.planId);
+      }
+
+      if (this.planQuantity != null) {
+
+        formData.put("plan_quantity", this.planQuantity);
+      }
+
+      if (this.planQuantityInDecimal != null) {
+
+        formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+      }
+
+      if (this.planUnitPrice != null) {
+
+        formData.put("plan_unit_price", this.planUnitPrice);
+      }
+
+      if (this.planUnitPriceInDecimal != null) {
+
+        formData.put("plan_unit_price_in_decimal", this.planUnitPriceInDecimal);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private String poNumber;
+
+      private String planId;
+
+      private Integer planQuantity;
+
+      private String planQuantityInDecimal;
+
+      private Long planUnitPrice;
+
+      private String planUnitPriceInDecimal;
+
+      private Long setupFee;
+
+      private Timestamp trialEnd;
+
+      private Timestamp startDate;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder poNumber(String value) {
+        this.poNumber = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planId(String value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantity(Integer value) {
+        this.planQuantity = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantityInDecimal(String value) {
+        this.planQuantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPrice(Long value) {
+        this.planUnitPrice = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
+        this.planUnitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AddonsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriodInDays;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOn chargeOn;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOn = builder.chargeOn;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOn getChargeOn() {
+      return chargeOn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOn != null) {
+
+        formData.put("charge_on", this.chargeOn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriodInDays;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOn chargeOn;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
+        this.chargeOn = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOn {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOn enumValue : ChargeOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/EditOneTimeQuoteParams.java b/src/main/java/com/chargebee/v4/models/quote/params/EditOneTimeQuoteParams.java
new file mode 100644
index 00000000..6052be7a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/EditOneTimeQuoteParams.java
@@ -0,0 +1,1053 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EditOneTimeQuoteParams {
+
+  private final String poNumber;
+
+  private final String notes;
+
+  private final Timestamp expiresAt;
+
+  private final String currencyCode;
+
+  private final String coupon;
+
+  private final List<String> couponIds;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<AddonsParams> addons;
+
+  private final List<ChargesParams> charges;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private EditOneTimeQuoteParams(EditOneTimeQuoteBuilder builder) {
+
+    this.poNumber = builder.poNumber;
+
+    this.notes = builder.notes;
+
+    this.expiresAt = builder.expiresAt;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.coupon = builder.coupon;
+
+    this.couponIds = builder.couponIds;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.addons = builder.addons;
+
+    this.charges = builder.charges;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public String getNotes() {
+    return notes;
+  }
+
+  public Timestamp getExpiresAt() {
+    return expiresAt;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<ChargesParams> getCharges() {
+    return charges;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.notes != null) {
+
+      formData.put("notes", this.notes);
+    }
+
+    if (this.expiresAt != null) {
+
+      formData.put("expires_at", this.expiresAt);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.charges != null) {
+
+      // List of objects
+      for (int i = 0; i < this.charges.size(); i++) {
+        ChargesParams item = this.charges.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EditOneTimeQuoteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EditOneTimeQuoteBuilder builder() {
+    return new EditOneTimeQuoteBuilder();
+  }
+
+  public static final class EditOneTimeQuoteBuilder {
+
+    private String poNumber;
+
+    private String notes;
+
+    private Timestamp expiresAt;
+
+    private String currencyCode;
+
+    private String coupon;
+
+    private List<String> couponIds;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<AddonsParams> addons;
+
+    private List<ChargesParams> charges;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private EditOneTimeQuoteBuilder() {}
+
+    public EditOneTimeQuoteBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public EditOneTimeQuoteBuilder notes(String value) {
+      this.notes = value;
+      return this;
+    }
+
+    public EditOneTimeQuoteBuilder expiresAt(Timestamp value) {
+      this.expiresAt = value;
+      return this;
+    }
+
+    public EditOneTimeQuoteBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public EditOneTimeQuoteBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public EditOneTimeQuoteBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public EditOneTimeQuoteBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public EditOneTimeQuoteBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public EditOneTimeQuoteBuilder charges(List<ChargesParams> value) {
+      this.charges = value;
+      return this;
+    }
+
+    public EditOneTimeQuoteBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public EditOneTimeQuoteParams build() {
+      return new EditOneTimeQuoteParams(this);
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriod;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriod = builder.servicePeriod;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriod() {
+      return servicePeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriod != null) {
+
+        formData.put("service_period", this.servicePeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriod;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder servicePeriod(Integer value) {
+        this.servicePeriod = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class ChargesParams {
+
+    private final Long amount;
+
+    private final String amountInDecimal;
+
+    private final String description;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final Integer servicePeriod;
+
+    private ChargesParams(ChargesBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.description = builder.description;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.servicePeriod = builder.servicePeriod;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public Integer getServicePeriod() {
+      return servicePeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.servicePeriod != null) {
+
+        formData.put("service_period", this.servicePeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargesBuilder builder() {
+      return new ChargesBuilder();
+    }
+
+    public static final class ChargesBuilder {
+
+      private Long amount;
+
+      private String amountInDecimal;
+
+      private String description;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private Integer servicePeriod;
+
+      private ChargesBuilder() {}
+
+      public ChargesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public ChargesBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public ChargesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public ChargesBuilder servicePeriod(Integer value) {
+        this.servicePeriod = value;
+        return this;
+      }
+
+      public ChargesParams build() {
+        return new ChargesParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/EditUpdateSubscriptionQuoteForItemsParams.java b/src/main/java/com/chargebee/v4/models/quote/params/EditUpdateSubscriptionQuoteForItemsParams.java
new file mode 100644
index 00000000..f9937815
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/EditUpdateSubscriptionQuoteForItemsParams.java
@@ -0,0 +1,2992 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EditUpdateSubscriptionQuoteForItemsParams {
+
+  private final String notes;
+
+  private final Timestamp expiresAt;
+
+  private final List<String> mandatoryItemsToRemove;
+
+  private final Boolean replaceItemsList;
+
+  private final Integer billingCycles;
+
+  private final Integer termsToCharge;
+
+  private final Timestamp reactivateFrom;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final Boolean replaceCouponList;
+
+  private final ChangeOption changeOption;
+
+  private final Timestamp changesScheduledAt;
+
+  private final Boolean forceTermReset;
+
+  private final Boolean reactivate;
+
+  private final Integer netTermDays;
+
+  private final SubscriptionParams subscription;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final CustomerParams customer;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<CouponsParams> coupons;
+
+  private final Map<String, String> customFields;
+
+  private EditUpdateSubscriptionQuoteForItemsParams(
+      EditUpdateSubscriptionQuoteForItemsBuilder builder) {
+
+    this.notes = builder.notes;
+
+    this.expiresAt = builder.expiresAt;
+
+    this.mandatoryItemsToRemove = builder.mandatoryItemsToRemove;
+
+    this.replaceItemsList = builder.replaceItemsList;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.reactivateFrom = builder.reactivateFrom;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.replaceCouponList = builder.replaceCouponList;
+
+    this.changeOption = builder.changeOption;
+
+    this.changesScheduledAt = builder.changesScheduledAt;
+
+    this.forceTermReset = builder.forceTermReset;
+
+    this.reactivate = builder.reactivate;
+
+    this.netTermDays = builder.netTermDays;
+
+    this.subscription = builder.subscription;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.customer = builder.customer;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.discounts = builder.discounts;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.coupons = builder.coupons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getNotes() {
+    return notes;
+  }
+
+  public Timestamp getExpiresAt() {
+    return expiresAt;
+  }
+
+  public List<String> getMandatoryItemsToRemove() {
+    return mandatoryItemsToRemove;
+  }
+
+  public Boolean getReplaceItemsList() {
+    return replaceItemsList;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public Timestamp getReactivateFrom() {
+    return reactivateFrom;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public Boolean getReplaceCouponList() {
+    return replaceCouponList;
+  }
+
+  public ChangeOption getChangeOption() {
+    return changeOption;
+  }
+
+  public Timestamp getChangesScheduledAt() {
+    return changesScheduledAt;
+  }
+
+  public Boolean getForceTermReset() {
+    return forceTermReset;
+  }
+
+  public Boolean getReactivate() {
+    return reactivate;
+  }
+
+  public Integer getNetTermDays() {
+    return netTermDays;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<CouponsParams> getCoupons() {
+    return coupons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.notes != null) {
+
+      formData.put("notes", this.notes);
+    }
+
+    if (this.expiresAt != null) {
+
+      formData.put("expires_at", this.expiresAt);
+    }
+
+    if (this.mandatoryItemsToRemove != null) {
+
+      formData.put("mandatory_items_to_remove", this.mandatoryItemsToRemove);
+    }
+
+    if (this.replaceItemsList != null) {
+
+      formData.put("replace_items_list", this.replaceItemsList);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.reactivateFrom != null) {
+
+      formData.put("reactivate_from", this.reactivateFrom);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.replaceCouponList != null) {
+
+      formData.put("replace_coupon_list", this.replaceCouponList);
+    }
+
+    if (this.changeOption != null) {
+
+      formData.put("change_option", this.changeOption);
+    }
+
+    if (this.changesScheduledAt != null) {
+
+      formData.put("changes_scheduled_at", this.changesScheduledAt);
+    }
+
+    if (this.forceTermReset != null) {
+
+      formData.put("force_term_reset", this.forceTermReset);
+    }
+
+    if (this.reactivate != null) {
+
+      formData.put("reactivate", this.reactivate);
+    }
+
+    if (this.netTermDays != null) {
+
+      formData.put("net_term_days", this.netTermDays);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.coupons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.coupons.size(); i++) {
+        CouponsParams item = this.coupons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for EditUpdateSubscriptionQuoteForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EditUpdateSubscriptionQuoteForItemsBuilder builder() {
+    return new EditUpdateSubscriptionQuoteForItemsBuilder();
+  }
+
+  public static final class EditUpdateSubscriptionQuoteForItemsBuilder {
+
+    private String notes;
+
+    private Timestamp expiresAt;
+
+    private List<String> mandatoryItemsToRemove;
+
+    private Boolean replaceItemsList;
+
+    private Integer billingCycles;
+
+    private Integer termsToCharge;
+
+    private Timestamp reactivateFrom;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private Boolean replaceCouponList;
+
+    private ChangeOption changeOption;
+
+    private Timestamp changesScheduledAt;
+
+    private Boolean forceTermReset;
+
+    private Boolean reactivate;
+
+    private Integer netTermDays;
+
+    private SubscriptionParams subscription;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private CustomerParams customer;
+
+    private ContractTermParams contractTerm;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<DiscountsParams> discounts;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<CouponsParams> coupons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private EditUpdateSubscriptionQuoteForItemsBuilder() {}
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder notes(String value) {
+      this.notes = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder expiresAt(Timestamp value) {
+      this.expiresAt = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder mandatoryItemsToRemove(List<String> value) {
+      this.mandatoryItemsToRemove = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder replaceItemsList(Boolean value) {
+      this.replaceItemsList = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder reactivateFrom(Timestamp value) {
+      this.reactivateFrom = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder billingAlignmentMode(
+        BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder replaceCouponList(Boolean value) {
+      this.replaceCouponList = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder changeOption(ChangeOption value) {
+      this.changeOption = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder changesScheduledAt(Timestamp value) {
+      this.changesScheduledAt = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder forceTermReset(Boolean value) {
+      this.forceTermReset = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder reactivate(Boolean value) {
+      this.reactivate = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder netTermDays(Integer value) {
+      this.netTermDays = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsBuilder coupons(List<CouponsParams> value) {
+      this.coupons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public EditUpdateSubscriptionQuoteForItemsBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public EditUpdateSubscriptionQuoteForItemsBuilder customFields(
+        Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsParams build() {
+      return new EditUpdateSubscriptionQuoteForItemsParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChangeOption {
+    IMMEDIATELY("immediately"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChangeOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChangeOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChangeOption enumValue : ChangeOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final Long setupFee;
+
+    private final Timestamp startDate;
+
+    private final Timestamp trialEnd;
+
+    private final String coupon;
+
+    private final AutoCollection autoCollection;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.setupFee = builder.setupFee;
+
+      this.startDate = builder.startDate;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.coupon = builder.coupon;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public String getCoupon() {
+      return coupon;
+    }
+
+    public AutoCollection getAutoCollection() {
+      return autoCollection;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.coupon != null) {
+
+        formData.put("coupon", this.coupon);
+      }
+
+      if (this.autoCollection != null) {
+
+        formData.put("auto_collection", this.autoCollection);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private Long setupFee;
+
+      private Timestamp startDate;
+
+      private Timestamp trialEnd;
+
+      private String coupon;
+
+      private AutoCollection autoCollection;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private SubscriptionBuilder() {}
+
+      @Deprecated
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder coupon(String value) {
+        this.coupon = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCollection(AutoCollection value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum AutoCollection {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AutoCollection(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AutoCollection fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AutoCollection enumValue : AutoCollection.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final Boolean registeredForGst;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.registeredForGst = builder.registeredForGst;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public Boolean getRegisteredForGst() {
+      return registeredForGst;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.registeredForGst != null) {
+
+        formData.put("registered_for_gst", this.registeredForGst);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private Boolean registeredForGst;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder registeredForGst(Boolean value) {
+        this.registeredForGst = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private final ItemType itemType;
+
+    private final Timestamp startDate;
+
+    private final Timestamp endDate;
+
+    private final String rampTierId;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOnOption = builder.chargeOnOption;
+
+      this.itemType = builder.itemType;
+
+      this.startDate = builder.startDate;
+
+      this.endDate = builder.endDate;
+
+      this.rampTierId = builder.rampTierId;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    public String getRampTierId() {
+      return rampTierId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      if (this.rampTierId != null) {
+
+        formData.put("ramp_tier_id", this.rampTierId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOnOption chargeOnOption;
+
+      private ItemType itemType;
+
+      private Timestamp startDate;
+
+      private Timestamp endDate;
+
+      private String rampTierId;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder rampTierId(String value) {
+        this.rampTierId = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final OperationType operationType;
+
+    private final String id;
+
+    private final Timestamp startDate;
+
+    private final Timestamp endDate;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.operationType = builder.operationType;
+
+      this.id = builder.id;
+
+      this.startDate = builder.startDate;
+
+      this.endDate = builder.endDate;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public OperationType getOperationType() {
+      return operationType;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.operationType != null) {
+
+        formData.put("operation_type", this.operationType);
+      }
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private OperationType operationType;
+
+      private String id;
+
+      private Timestamp startDate;
+
+      private Timestamp endDate;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder operationType(OperationType value) {
+        this.operationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public DiscountsBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public DiscountsBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OperationType {
+      ADD("add"),
+
+      REMOVE("remove"),
+
+      /** An enum member indicating that OperationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OperationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OperationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OperationType enumValue : OperationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private final String rampTierId;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+
+      this.rampTierId = builder.rampTierId;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    public String getRampTierId() {
+      return rampTierId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      if (this.rampTierId != null) {
+
+        formData.put("ramp_tier_id", this.rampTierId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private String rampTierId;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersBuilder rampTierId(String value) {
+        this.rampTierId = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponsParams {
+
+    private final String id;
+
+    private final Timestamp startDate;
+
+    private final Timestamp endDate;
+
+    private CouponsParams(CouponsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.startDate = builder.startDate;
+
+      this.endDate = builder.endDate;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsBuilder builder() {
+      return new CouponsBuilder();
+    }
+
+    public static final class CouponsBuilder {
+
+      private String id;
+
+      private Timestamp startDate;
+
+      private Timestamp endDate;
+
+      private CouponsBuilder() {}
+
+      public CouponsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CouponsBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public CouponsBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public CouponsParams build() {
+        return new CouponsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/EditUpdateSubscriptionQuoteParams.java b/src/main/java/com/chargebee/v4/models/quote/params/EditUpdateSubscriptionQuoteParams.java
new file mode 100644
index 00000000..6a2298d5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/EditUpdateSubscriptionQuoteParams.java
@@ -0,0 +1,2221 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class EditUpdateSubscriptionQuoteParams {
+
+  private final String notes;
+
+  private final Timestamp expiresAt;
+
+  private final Boolean replaceAddonList;
+
+  private final List<String> mandatoryAddonsToRemove;
+
+  private final Integer billingCycles;
+
+  private final Integer termsToCharge;
+
+  private final Timestamp reactivateFrom;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final Boolean replaceCouponList;
+
+  private final ChangeOption changeOption;
+
+  private final Timestamp changesScheduledAt;
+
+  private final Boolean forceTermReset;
+
+  private final Boolean reactivate;
+
+  private final SubscriptionParams subscription;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final CustomerParams customer;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<AddonsParams> addons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private EditUpdateSubscriptionQuoteParams(EditUpdateSubscriptionQuoteBuilder builder) {
+
+    this.notes = builder.notes;
+
+    this.expiresAt = builder.expiresAt;
+
+    this.replaceAddonList = builder.replaceAddonList;
+
+    this.mandatoryAddonsToRemove = builder.mandatoryAddonsToRemove;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.reactivateFrom = builder.reactivateFrom;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.replaceCouponList = builder.replaceCouponList;
+
+    this.changeOption = builder.changeOption;
+
+    this.changesScheduledAt = builder.changesScheduledAt;
+
+    this.forceTermReset = builder.forceTermReset;
+
+    this.reactivate = builder.reactivate;
+
+    this.subscription = builder.subscription;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.customer = builder.customer;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.addons = builder.addons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+  }
+
+  public String getNotes() {
+    return notes;
+  }
+
+  public Timestamp getExpiresAt() {
+    return expiresAt;
+  }
+
+  public Boolean getReplaceAddonList() {
+    return replaceAddonList;
+  }
+
+  public List<String> getMandatoryAddonsToRemove() {
+    return mandatoryAddonsToRemove;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public Timestamp getReactivateFrom() {
+    return reactivateFrom;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public Boolean getReplaceCouponList() {
+    return replaceCouponList;
+  }
+
+  public ChangeOption getChangeOption() {
+    return changeOption;
+  }
+
+  public Timestamp getChangesScheduledAt() {
+    return changesScheduledAt;
+  }
+
+  public Boolean getForceTermReset() {
+    return forceTermReset;
+  }
+
+  public Boolean getReactivate() {
+    return reactivate;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.notes != null) {
+
+      formData.put("notes", this.notes);
+    }
+
+    if (this.expiresAt != null) {
+
+      formData.put("expires_at", this.expiresAt);
+    }
+
+    if (this.replaceAddonList != null) {
+
+      formData.put("replace_addon_list", this.replaceAddonList);
+    }
+
+    if (this.mandatoryAddonsToRemove != null) {
+
+      formData.put("mandatory_addons_to_remove", this.mandatoryAddonsToRemove);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.reactivateFrom != null) {
+
+      formData.put("reactivate_from", this.reactivateFrom);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.replaceCouponList != null) {
+
+      formData.put("replace_coupon_list", this.replaceCouponList);
+    }
+
+    if (this.changeOption != null) {
+
+      formData.put("change_option", this.changeOption);
+    }
+
+    if (this.changesScheduledAt != null) {
+
+      formData.put("changes_scheduled_at", this.changesScheduledAt);
+    }
+
+    if (this.forceTermReset != null) {
+
+      formData.put("force_term_reset", this.forceTermReset);
+    }
+
+    if (this.reactivate != null) {
+
+      formData.put("reactivate", this.reactivate);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for EditUpdateSubscriptionQuoteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static EditUpdateSubscriptionQuoteBuilder builder() {
+    return new EditUpdateSubscriptionQuoteBuilder();
+  }
+
+  public static final class EditUpdateSubscriptionQuoteBuilder {
+
+    private String notes;
+
+    private Timestamp expiresAt;
+
+    private Boolean replaceAddonList;
+
+    private List<String> mandatoryAddonsToRemove;
+
+    private Integer billingCycles;
+
+    private Integer termsToCharge;
+
+    private Timestamp reactivateFrom;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private Boolean replaceCouponList;
+
+    private ChangeOption changeOption;
+
+    private Timestamp changesScheduledAt;
+
+    private Boolean forceTermReset;
+
+    private Boolean reactivate;
+
+    private SubscriptionParams subscription;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private CustomerParams customer;
+
+    private ContractTermParams contractTerm;
+
+    private List<AddonsParams> addons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private EditUpdateSubscriptionQuoteBuilder() {}
+
+    public EditUpdateSubscriptionQuoteBuilder notes(String value) {
+      this.notes = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder expiresAt(Timestamp value) {
+      this.expiresAt = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder replaceAddonList(Boolean value) {
+      this.replaceAddonList = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder mandatoryAddonsToRemove(List<String> value) {
+      this.mandatoryAddonsToRemove = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder reactivateFrom(Timestamp value) {
+      this.reactivateFrom = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder replaceCouponList(Boolean value) {
+      this.replaceCouponList = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder changeOption(ChangeOption value) {
+      this.changeOption = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder changesScheduledAt(Timestamp value) {
+      this.changesScheduledAt = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder forceTermReset(Boolean value) {
+      this.forceTermReset = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder reactivate(Boolean value) {
+      this.reactivate = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteParams build() {
+      return new EditUpdateSubscriptionQuoteParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChangeOption {
+    IMMEDIATELY("immediately"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChangeOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChangeOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChangeOption enumValue : ChangeOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String planId;
+
+    private final Integer planQuantity;
+
+    private final Long planUnitPrice;
+
+    private final Long setupFee;
+
+    private final String planQuantityInDecimal;
+
+    private final String planUnitPriceInDecimal;
+
+    private final Timestamp startDate;
+
+    private final Timestamp trialEnd;
+
+    private final String coupon;
+
+    private final AutoCollection autoCollection;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.planId = builder.planId;
+
+      this.planQuantity = builder.planQuantity;
+
+      this.planUnitPrice = builder.planUnitPrice;
+
+      this.setupFee = builder.setupFee;
+
+      this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+      this.planUnitPriceInDecimal = builder.planUnitPriceInDecimal;
+
+      this.startDate = builder.startDate;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.coupon = builder.coupon;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+    }
+
+    public String getPlanId() {
+      return planId;
+    }
+
+    public Integer getPlanQuantity() {
+      return planQuantity;
+    }
+
+    public Long getPlanUnitPrice() {
+      return planUnitPrice;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public String getPlanQuantityInDecimal() {
+      return planQuantityInDecimal;
+    }
+
+    public String getPlanUnitPriceInDecimal() {
+      return planUnitPriceInDecimal;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public String getCoupon() {
+      return coupon;
+    }
+
+    public AutoCollection getAutoCollection() {
+      return autoCollection;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.planId != null) {
+
+        formData.put("plan_id", this.planId);
+      }
+
+      if (this.planQuantity != null) {
+
+        formData.put("plan_quantity", this.planQuantity);
+      }
+
+      if (this.planUnitPrice != null) {
+
+        formData.put("plan_unit_price", this.planUnitPrice);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.planQuantityInDecimal != null) {
+
+        formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+      }
+
+      if (this.planUnitPriceInDecimal != null) {
+
+        formData.put("plan_unit_price_in_decimal", this.planUnitPriceInDecimal);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.coupon != null) {
+
+        formData.put("coupon", this.coupon);
+      }
+
+      if (this.autoCollection != null) {
+
+        formData.put("auto_collection", this.autoCollection);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String planId;
+
+      private Integer planQuantity;
+
+      private Long planUnitPrice;
+
+      private Long setupFee;
+
+      private String planQuantityInDecimal;
+
+      private String planUnitPriceInDecimal;
+
+      private Timestamp startDate;
+
+      private Timestamp trialEnd;
+
+      private String coupon;
+
+      private AutoCollection autoCollection;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder planId(String value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantity(Integer value) {
+        this.planQuantity = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPrice(Long value) {
+        this.planUnitPrice = value;
+        return this;
+      }
+
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantityInDecimal(String value) {
+        this.planQuantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
+        this.planUnitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder coupon(String value) {
+        this.coupon = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCollection(AutoCollection value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum AutoCollection {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AutoCollection(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AutoCollection fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AutoCollection enumValue : AutoCollection.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final Boolean registeredForGst;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.registeredForGst = builder.registeredForGst;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public Boolean getRegisteredForGst() {
+      return registeredForGst;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.registeredForGst != null) {
+
+        formData.put("registered_for_gst", this.registeredForGst);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private Boolean registeredForGst;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder registeredForGst(Boolean value) {
+        this.registeredForGst = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final Integer billingCycles;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp trialEnd;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.trialEnd = builder.trialEnd;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private Integer billingCycles;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp trialEnd;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final Integer servicePeriodInDays;
+
+    private final ChargeOn chargeOn;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+
+      this.chargeOn = builder.chargeOn;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    public ChargeOn getChargeOn() {
+      return chargeOn;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      if (this.chargeOn != null) {
+
+        formData.put("charge_on", this.chargeOn);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private Integer servicePeriodInDays;
+
+      private ChargeOn chargeOn;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
+        this.chargeOn = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum ChargeOn {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOn enumValue : ChargeOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/QuoteConvertParams.java b/src/main/java/com/chargebee/v4/models/quote/params/QuoteConvertParams.java
new file mode 100644
index 00000000..2855df84
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/QuoteConvertParams.java
@@ -0,0 +1,282 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class QuoteConvertParams {
+
+  private final Timestamp invoiceDate;
+
+  private final Boolean invoiceImmediately;
+
+  private final Boolean createPendingInvoices;
+
+  private final Boolean firstInvoicePending;
+
+  private final SubscriptionParams subscription;
+
+  private QuoteConvertParams(QuoteConvertBuilder builder) {
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.createPendingInvoices = builder.createPendingInvoices;
+
+    this.firstInvoicePending = builder.firstInvoicePending;
+
+    this.subscription = builder.subscription;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public Boolean getCreatePendingInvoices() {
+    return createPendingInvoices;
+  }
+
+  public Boolean getFirstInvoicePending() {
+    return firstInvoicePending;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.createPendingInvoices != null) {
+
+      formData.put("create_pending_invoices", this.createPendingInvoices);
+    }
+
+    if (this.firstInvoicePending != null) {
+
+      formData.put("first_invoice_pending", this.firstInvoicePending);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for QuoteConvertParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static QuoteConvertBuilder builder() {
+    return new QuoteConvertBuilder();
+  }
+
+  public static final class QuoteConvertBuilder {
+
+    private Timestamp invoiceDate;
+
+    private Boolean invoiceImmediately;
+
+    private Boolean createPendingInvoices;
+
+    private Boolean firstInvoicePending;
+
+    private SubscriptionParams subscription;
+
+    private QuoteConvertBuilder() {}
+
+    public QuoteConvertBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public QuoteConvertBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public QuoteConvertBuilder createPendingInvoices(Boolean value) {
+      this.createPendingInvoices = value;
+      return this;
+    }
+
+    public QuoteConvertBuilder firstInvoicePending(Boolean value) {
+      this.firstInvoicePending = value;
+      return this;
+    }
+
+    public QuoteConvertBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public QuoteConvertParams build() {
+      return new QuoteConvertParams(this);
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final AutoCollection autoCollection;
+
+    private final String poNumber;
+
+    private final Boolean autoCloseInvoices;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.poNumber = builder.poNumber;
+
+      this.autoCloseInvoices = builder.autoCloseInvoices;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public AutoCollection getAutoCollection() {
+      return autoCollection;
+    }
+
+    public String getPoNumber() {
+      return poNumber;
+    }
+
+    public Boolean getAutoCloseInvoices() {
+      return autoCloseInvoices;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.autoCollection != null) {
+
+        formData.put("auto_collection", this.autoCollection);
+      }
+
+      if (this.poNumber != null) {
+
+        formData.put("po_number", this.poNumber);
+      }
+
+      if (this.autoCloseInvoices != null) {
+
+        formData.put("auto_close_invoices", this.autoCloseInvoices);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private AutoCollection autoCollection;
+
+      private String poNumber;
+
+      private Boolean autoCloseInvoices;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCollection(AutoCollection value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public SubscriptionBuilder poNumber(String value) {
+        this.poNumber = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCloseInvoices(Boolean value) {
+        this.autoCloseInvoices = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum AutoCollection {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AutoCollection(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AutoCollection fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AutoCollection enumValue : AutoCollection.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/QuoteCreateForChargeItemsAndChargesParams.java b/src/main/java/com/chargebee/v4/models/quote/params/QuoteCreateForChargeItemsAndChargesParams.java
new file mode 100644
index 00000000..f4f2e3a5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/QuoteCreateForChargeItemsAndChargesParams.java
@@ -0,0 +1,1914 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class QuoteCreateForChargeItemsAndChargesParams {
+
+  private final String name;
+
+  private final String customerId;
+
+  private final String poNumber;
+
+  private final String notes;
+
+  private final Timestamp expiresAt;
+
+  private final String currencyCode;
+
+  private final String coupon;
+
+  private final List<String> couponIds;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<ItemPricesParams> itemPrices;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<ChargesParams> charges;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private QuoteCreateForChargeItemsAndChargesParams(
+      QuoteCreateForChargeItemsAndChargesBuilder builder) {
+
+    this.name = builder.name;
+
+    this.customerId = builder.customerId;
+
+    this.poNumber = builder.poNumber;
+
+    this.notes = builder.notes;
+
+    this.expiresAt = builder.expiresAt;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.coupon = builder.coupon;
+
+    this.couponIds = builder.couponIds;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.itemPrices = builder.itemPrices;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.charges = builder.charges;
+
+    this.discounts = builder.discounts;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public String getNotes() {
+    return notes;
+  }
+
+  public Timestamp getExpiresAt() {
+    return expiresAt;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<ItemPricesParams> getItemPrices() {
+    return itemPrices;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<ChargesParams> getCharges() {
+    return charges;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.notes != null) {
+
+      formData.put("notes", this.notes);
+    }
+
+    if (this.expiresAt != null) {
+
+      formData.put("expires_at", this.expiresAt);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemPrices != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemPrices.size(); i++) {
+        ItemPricesParams item = this.itemPrices.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_prices[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.charges != null) {
+
+      // List of objects
+      for (int i = 0; i < this.charges.size(); i++) {
+        ChargesParams item = this.charges.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for QuoteCreateForChargeItemsAndChargesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static QuoteCreateForChargeItemsAndChargesBuilder builder() {
+    return new QuoteCreateForChargeItemsAndChargesBuilder();
+  }
+
+  public static final class QuoteCreateForChargeItemsAndChargesBuilder {
+
+    private String name;
+
+    private String customerId;
+
+    private String poNumber;
+
+    private String notes;
+
+    private Timestamp expiresAt;
+
+    private String currencyCode;
+
+    private String coupon;
+
+    private List<String> couponIds;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<ItemPricesParams> itemPrices;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<ChargesParams> charges;
+
+    private List<DiscountsParams> discounts;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private QuoteCreateForChargeItemsAndChargesBuilder() {}
+
+    public QuoteCreateForChargeItemsAndChargesBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder notes(String value) {
+      this.notes = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder expiresAt(Timestamp value) {
+      this.expiresAt = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder itemPrices(List<ItemPricesParams> value) {
+      this.itemPrices = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder charges(List<ChargesParams> value) {
+      this.charges = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesBuilder taxProvidersFields(
+        List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public QuoteCreateForChargeItemsAndChargesParams build() {
+      return new QuoteCreateForChargeItemsAndChargesParams(this);
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemPricesParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriodDays;
+
+    private ItemPricesParams(ItemPricesBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemPricesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemPricesBuilder builder() {
+      return new ItemPricesBuilder();
+    }
+
+    public static final class ItemPricesBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriodDays;
+
+      private ItemPricesBuilder() {}
+
+      public ItemPricesBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemPricesBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public ItemPricesBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public ItemPricesBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public ItemPricesBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public ItemPricesBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public ItemPricesParams build() {
+        return new ItemPricesParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChargesParams {
+
+    private final Long amount;
+
+    private final String amountInDecimal;
+
+    private final String description;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final Integer servicePeriod;
+
+    private ChargesParams(ChargesBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.description = builder.description;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.servicePeriod = builder.servicePeriod;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public Integer getServicePeriod() {
+      return servicePeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.servicePeriod != null) {
+
+        formData.put("service_period", this.servicePeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargesBuilder builder() {
+      return new ChargesBuilder();
+    }
+
+    public static final class ChargesBuilder {
+
+      private Long amount;
+
+      private String amountInDecimal;
+
+      private String description;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private Integer servicePeriod;
+
+      private ChargesBuilder() {}
+
+      public ChargesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public ChargesBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public ChargesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public ChargesBuilder servicePeriod(Integer value) {
+        this.servicePeriod = value;
+        return this;
+      }
+
+      public ChargesParams build() {
+        return new ChargesParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final Number percentage;
+
+    private final Integer quantity;
+
+    private final Long amount;
+
+    private final ApplyOn applyOn;
+
+    private final String itemPriceId;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.percentage = builder.percentage;
+
+      this.quantity = builder.quantity;
+
+      this.amount = builder.amount;
+
+      this.applyOn = builder.applyOn;
+
+      this.itemPriceId = builder.itemPriceId;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private Number percentage;
+
+      private Integer quantity;
+
+      private Long amount;
+
+      private ApplyOn applyOn;
+
+      private String itemPriceId;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/QuoteCreateForOnetimeChargesParams.java b/src/main/java/com/chargebee/v4/models/quote/params/QuoteCreateForOnetimeChargesParams.java
new file mode 100644
index 00000000..1ba3b8f2
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/QuoteCreateForOnetimeChargesParams.java
@@ -0,0 +1,1094 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class QuoteCreateForOnetimeChargesParams {
+
+  private final String name;
+
+  private final String customerId;
+
+  private final String poNumber;
+
+  private final String notes;
+
+  private final Timestamp expiresAt;
+
+  private final String currencyCode;
+
+  private final String coupon;
+
+  private final List<String> couponIds;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<AddonsParams> addons;
+
+  private final List<ChargesParams> charges;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private QuoteCreateForOnetimeChargesParams(QuoteCreateForOnetimeChargesBuilder builder) {
+
+    this.name = builder.name;
+
+    this.customerId = builder.customerId;
+
+    this.poNumber = builder.poNumber;
+
+    this.notes = builder.notes;
+
+    this.expiresAt = builder.expiresAt;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.coupon = builder.coupon;
+
+    this.couponIds = builder.couponIds;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.addons = builder.addons;
+
+    this.charges = builder.charges;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public String getNotes() {
+    return notes;
+  }
+
+  public Timestamp getExpiresAt() {
+    return expiresAt;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<ChargesParams> getCharges() {
+    return charges;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.notes != null) {
+
+      formData.put("notes", this.notes);
+    }
+
+    if (this.expiresAt != null) {
+
+      formData.put("expires_at", this.expiresAt);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.charges != null) {
+
+      // List of objects
+      for (int i = 0; i < this.charges.size(); i++) {
+        ChargesParams item = this.charges.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for QuoteCreateForOnetimeChargesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static QuoteCreateForOnetimeChargesBuilder builder() {
+    return new QuoteCreateForOnetimeChargesBuilder();
+  }
+
+  public static final class QuoteCreateForOnetimeChargesBuilder {
+
+    private String name;
+
+    private String customerId;
+
+    private String poNumber;
+
+    private String notes;
+
+    private Timestamp expiresAt;
+
+    private String currencyCode;
+
+    private String coupon;
+
+    private List<String> couponIds;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<AddonsParams> addons;
+
+    private List<ChargesParams> charges;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private QuoteCreateForOnetimeChargesBuilder() {}
+
+    public QuoteCreateForOnetimeChargesBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public QuoteCreateForOnetimeChargesBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public QuoteCreateForOnetimeChargesBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public QuoteCreateForOnetimeChargesBuilder notes(String value) {
+      this.notes = value;
+      return this;
+    }
+
+    public QuoteCreateForOnetimeChargesBuilder expiresAt(Timestamp value) {
+      this.expiresAt = value;
+      return this;
+    }
+
+    public QuoteCreateForOnetimeChargesBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public QuoteCreateForOnetimeChargesBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public QuoteCreateForOnetimeChargesBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public QuoteCreateForOnetimeChargesBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public QuoteCreateForOnetimeChargesBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public QuoteCreateForOnetimeChargesBuilder charges(List<ChargesParams> value) {
+      this.charges = value;
+      return this;
+    }
+
+    public QuoteCreateForOnetimeChargesBuilder taxProvidersFields(
+        List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public QuoteCreateForOnetimeChargesParams build() {
+      return new QuoteCreateForOnetimeChargesParams(this);
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriod;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriod = builder.servicePeriod;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriod() {
+      return servicePeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriod != null) {
+
+        formData.put("service_period", this.servicePeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriod;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder servicePeriod(Integer value) {
+        this.servicePeriod = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class ChargesParams {
+
+    private final Long amount;
+
+    private final String amountInDecimal;
+
+    private final String description;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final Integer servicePeriod;
+
+    private ChargesParams(ChargesBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.description = builder.description;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.servicePeriod = builder.servicePeriod;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public Integer getServicePeriod() {
+      return servicePeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.servicePeriod != null) {
+
+        formData.put("service_period", this.servicePeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargesBuilder builder() {
+      return new ChargesBuilder();
+    }
+
+    public static final class ChargesBuilder {
+
+      private Long amount;
+
+      private String amountInDecimal;
+
+      private String description;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private Integer servicePeriod;
+
+      private ChargesBuilder() {}
+
+      public ChargesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public ChargesBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public ChargesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public ChargesBuilder servicePeriod(Integer value) {
+        this.servicePeriod = value;
+        return this;
+      }
+
+      public ChargesParams build() {
+        return new ChargesParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/QuoteDeleteParams.java b/src/main/java/com/chargebee/v4/models/quote/params/QuoteDeleteParams.java
new file mode 100644
index 00000000..ab86bfc3
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/QuoteDeleteParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class QuoteDeleteParams {
+
+  private final String comment;
+
+  private QuoteDeleteParams(QuoteDeleteBuilder builder) {
+
+    this.comment = builder.comment;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for QuoteDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static QuoteDeleteBuilder builder() {
+    return new QuoteDeleteBuilder();
+  }
+
+  public static final class QuoteDeleteBuilder {
+
+    private String comment;
+
+    private QuoteDeleteBuilder() {}
+
+    public QuoteDeleteBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public QuoteDeleteParams build() {
+      return new QuoteDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/QuoteEditForChargeItemsAndChargesParams.java b/src/main/java/com/chargebee/v4/models/quote/params/QuoteEditForChargeItemsAndChargesParams.java
new file mode 100644
index 00000000..3f2475c2
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/QuoteEditForChargeItemsAndChargesParams.java
@@ -0,0 +1,1874 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class QuoteEditForChargeItemsAndChargesParams {
+
+  private final String poNumber;
+
+  private final String notes;
+
+  private final Timestamp expiresAt;
+
+  private final String currencyCode;
+
+  private final String coupon;
+
+  private final List<String> couponIds;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<ItemPricesParams> itemPrices;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<ChargesParams> charges;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private QuoteEditForChargeItemsAndChargesParams(
+      QuoteEditForChargeItemsAndChargesBuilder builder) {
+
+    this.poNumber = builder.poNumber;
+
+    this.notes = builder.notes;
+
+    this.expiresAt = builder.expiresAt;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.coupon = builder.coupon;
+
+    this.couponIds = builder.couponIds;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.itemPrices = builder.itemPrices;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.charges = builder.charges;
+
+    this.discounts = builder.discounts;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public String getNotes() {
+    return notes;
+  }
+
+  public Timestamp getExpiresAt() {
+    return expiresAt;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<ItemPricesParams> getItemPrices() {
+    return itemPrices;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<ChargesParams> getCharges() {
+    return charges;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.notes != null) {
+
+      formData.put("notes", this.notes);
+    }
+
+    if (this.expiresAt != null) {
+
+      formData.put("expires_at", this.expiresAt);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemPrices != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemPrices.size(); i++) {
+        ItemPricesParams item = this.itemPrices.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_prices[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.charges != null) {
+
+      // List of objects
+      for (int i = 0; i < this.charges.size(); i++) {
+        ChargesParams item = this.charges.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for QuoteEditForChargeItemsAndChargesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static QuoteEditForChargeItemsAndChargesBuilder builder() {
+    return new QuoteEditForChargeItemsAndChargesBuilder();
+  }
+
+  public static final class QuoteEditForChargeItemsAndChargesBuilder {
+
+    private String poNumber;
+
+    private String notes;
+
+    private Timestamp expiresAt;
+
+    private String currencyCode;
+
+    private String coupon;
+
+    private List<String> couponIds;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<ItemPricesParams> itemPrices;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<ChargesParams> charges;
+
+    private List<DiscountsParams> discounts;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private QuoteEditForChargeItemsAndChargesBuilder() {}
+
+    public QuoteEditForChargeItemsAndChargesBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public QuoteEditForChargeItemsAndChargesBuilder notes(String value) {
+      this.notes = value;
+      return this;
+    }
+
+    public QuoteEditForChargeItemsAndChargesBuilder expiresAt(Timestamp value) {
+      this.expiresAt = value;
+      return this;
+    }
+
+    public QuoteEditForChargeItemsAndChargesBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public QuoteEditForChargeItemsAndChargesBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public QuoteEditForChargeItemsAndChargesBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public QuoteEditForChargeItemsAndChargesBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public QuoteEditForChargeItemsAndChargesBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public QuoteEditForChargeItemsAndChargesBuilder itemPrices(List<ItemPricesParams> value) {
+      this.itemPrices = value;
+      return this;
+    }
+
+    public QuoteEditForChargeItemsAndChargesBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public QuoteEditForChargeItemsAndChargesBuilder charges(List<ChargesParams> value) {
+      this.charges = value;
+      return this;
+    }
+
+    public QuoteEditForChargeItemsAndChargesBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public QuoteEditForChargeItemsAndChargesBuilder taxProvidersFields(
+        List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public QuoteEditForChargeItemsAndChargesParams build() {
+      return new QuoteEditForChargeItemsAndChargesParams(this);
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemPricesParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriodDays;
+
+    private ItemPricesParams(ItemPricesBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemPricesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemPricesBuilder builder() {
+      return new ItemPricesBuilder();
+    }
+
+    public static final class ItemPricesBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriodDays;
+
+      private ItemPricesBuilder() {}
+
+      public ItemPricesBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemPricesBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public ItemPricesBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public ItemPricesBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public ItemPricesBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public ItemPricesBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public ItemPricesParams build() {
+        return new ItemPricesParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChargesParams {
+
+    private final Long amount;
+
+    private final String amountInDecimal;
+
+    private final String description;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final Integer servicePeriod;
+
+    private ChargesParams(ChargesBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.description = builder.description;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.servicePeriod = builder.servicePeriod;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public Integer getServicePeriod() {
+      return servicePeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.servicePeriod != null) {
+
+        formData.put("service_period", this.servicePeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargesBuilder builder() {
+      return new ChargesBuilder();
+    }
+
+    public static final class ChargesBuilder {
+
+      private Long amount;
+
+      private String amountInDecimal;
+
+      private String description;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private Integer servicePeriod;
+
+      private ChargesBuilder() {}
+
+      public ChargesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public ChargesBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public ChargesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public ChargesBuilder servicePeriod(Integer value) {
+        this.servicePeriod = value;
+        return this;
+      }
+
+      public ChargesParams build() {
+        return new ChargesParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final Number percentage;
+
+    private final Integer quantity;
+
+    private final Long amount;
+
+    private final ApplyOn applyOn;
+
+    private final String itemPriceId;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.percentage = builder.percentage;
+
+      this.quantity = builder.quantity;
+
+      this.amount = builder.amount;
+
+      this.applyOn = builder.applyOn;
+
+      this.itemPriceId = builder.itemPriceId;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private Number percentage;
+
+      private Integer quantity;
+
+      private Long amount;
+
+      private ApplyOn applyOn;
+
+      private String itemPriceId;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/QuoteExtendExpiryDateParams.java b/src/main/java/com/chargebee/v4/models/quote/params/QuoteExtendExpiryDateParams.java
new file mode 100644
index 00000000..2b3d4b54
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/QuoteExtendExpiryDateParams.java
@@ -0,0 +1,61 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class QuoteExtendExpiryDateParams {
+
+  private final Timestamp validTill;
+
+  private QuoteExtendExpiryDateParams(QuoteExtendExpiryDateBuilder builder) {
+
+    this.validTill = builder.validTill;
+  }
+
+  public Timestamp getValidTill() {
+    return validTill;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.validTill != null) {
+
+      formData.put("valid_till", this.validTill);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for QuoteExtendExpiryDateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static QuoteExtendExpiryDateBuilder builder() {
+    return new QuoteExtendExpiryDateBuilder();
+  }
+
+  public static final class QuoteExtendExpiryDateBuilder {
+
+    private Timestamp validTill;
+
+    private QuoteExtendExpiryDateBuilder() {}
+
+    public QuoteExtendExpiryDateBuilder validTill(Timestamp value) {
+      this.validTill = value;
+      return this;
+    }
+
+    public QuoteExtendExpiryDateParams build() {
+      return new QuoteExtendExpiryDateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/QuoteLineGroupsForQuoteParams.java b/src/main/java/com/chargebee/v4/models/quote/params/QuoteLineGroupsForQuoteParams.java
new file mode 100644
index 00000000..b254a6a5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/QuoteLineGroupsForQuoteParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class QuoteLineGroupsForQuoteParams {
+
+  private final Map<String, Object> queryParams;
+
+  private QuoteLineGroupsForQuoteParams(QuoteLineGroupsForQuoteBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public QuoteLineGroupsForQuoteBuilder toBuilder() {
+    QuoteLineGroupsForQuoteBuilder builder = new QuoteLineGroupsForQuoteBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for QuoteLineGroupsForQuoteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static QuoteLineGroupsForQuoteBuilder builder() {
+    return new QuoteLineGroupsForQuoteBuilder();
+  }
+
+  public static final class QuoteLineGroupsForQuoteBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private QuoteLineGroupsForQuoteBuilder() {}
+
+    public QuoteLineGroupsForQuoteBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public QuoteLineGroupsForQuoteBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public QuoteLineGroupsForQuoteParams build() {
+      return new QuoteLineGroupsForQuoteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteListParams.java b/src/main/java/com/chargebee/v4/models/quote/params/QuoteListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/quote/params/QuoteListParams.java
rename to src/main/java/com/chargebee/v4/models/quote/params/QuoteListParams.java
index 95eaf22a..3945c6fb 100644
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteListParams.java
+++ b/src/main/java/com/chargebee/v4/models/quote/params/QuoteListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.quote.params;
+package com.chargebee.v4.models.quote.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/QuotePdfParams.java b/src/main/java/com/chargebee/v4/models/quote/params/QuotePdfParams.java
new file mode 100644
index 00000000..e3cc6816
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/QuotePdfParams.java
@@ -0,0 +1,108 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class QuotePdfParams {
+
+  private final Boolean consolidatedView;
+
+  private final DispositionType dispositionType;
+
+  private QuotePdfParams(QuotePdfBuilder builder) {
+
+    this.consolidatedView = builder.consolidatedView;
+
+    this.dispositionType = builder.dispositionType;
+  }
+
+  public Boolean getConsolidatedView() {
+    return consolidatedView;
+  }
+
+  public DispositionType getDispositionType() {
+    return dispositionType;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.consolidatedView != null) {
+
+      formData.put("consolidated_view", this.consolidatedView);
+    }
+
+    if (this.dispositionType != null) {
+
+      formData.put("disposition_type", this.dispositionType);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for QuotePdfParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static QuotePdfBuilder builder() {
+    return new QuotePdfBuilder();
+  }
+
+  public static final class QuotePdfBuilder {
+
+    private Boolean consolidatedView;
+
+    private DispositionType dispositionType;
+
+    private QuotePdfBuilder() {}
+
+    public QuotePdfBuilder consolidatedView(Boolean value) {
+      this.consolidatedView = value;
+      return this;
+    }
+
+    public QuotePdfBuilder dispositionType(DispositionType value) {
+      this.dispositionType = value;
+      return this;
+    }
+
+    public QuotePdfParams build() {
+      return new QuotePdfParams(this);
+    }
+  }
+
+  public enum DispositionType {
+    ATTACHMENT("attachment"),
+
+    INLINE("inline"),
+
+    /** An enum member indicating that DispositionType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    DispositionType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static DispositionType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (DispositionType enumValue : DispositionType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteRetrieveParams.java b/src/main/java/com/chargebee/v4/models/quote/params/QuoteRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/quote/params/QuoteRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/quote/params/QuoteRetrieveParams.java
index 89837c07..601da363 100644
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/quote/params/QuoteRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.quote.params;
+package com.chargebee.v4.models.quote.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteUpdateStatusParams.java b/src/main/java/com/chargebee/v4/models/quote/params/QuoteUpdateStatusParams.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/models/quote/params/QuoteUpdateStatusParams.java
rename to src/main/java/com/chargebee/v4/models/quote/params/QuoteUpdateStatusParams.java
index 46328e70..e4b48999 100644
--- a/src/main/java/com/chargebee/v4/core/models/quote/params/QuoteUpdateStatusParams.java
+++ b/src/main/java/com/chargebee/v4/models/quote/params/QuoteUpdateStatusParams.java
@@ -4,24 +4,48 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.quote.params;
+package com.chargebee.v4.models.quote.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class QuoteUpdateStatusParams {
 
-  private final Map<String, Object> formData;
+  private final Status status;
+
+  private final String comment;
 
   private QuoteUpdateStatusParams(QuoteUpdateStatusBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
+
+    this.status = builder.status;
+
+    this.comment = builder.comment;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public String getComment() {
+    return comment;
   }
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
     return formData;
   }
 
@@ -32,21 +56,20 @@ public static QuoteUpdateStatusBuilder builder() {
   }
 
   public static final class QuoteUpdateStatusBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
-    private QuoteUpdateStatusBuilder() {}
+    private Status status;
 
-    public QuoteUpdateStatusBuilder status(Status value) {
+    private String comment;
 
-      formData.put("status", value);
+    private QuoteUpdateStatusBuilder() {}
 
+    public QuoteUpdateStatusBuilder status(Status value) {
+      this.status = value;
       return this;
     }
 
     public QuoteUpdateStatusBuilder comment(String value) {
-
-      formData.put("comment", value);
-
+      this.comment = value;
       return this;
     }
 
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/UpdateSubscriptionQuoteForItemsParams.java b/src/main/java/com/chargebee/v4/models/quote/params/UpdateSubscriptionQuoteForItemsParams.java
new file mode 100644
index 00000000..08cbbec3
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/UpdateSubscriptionQuoteForItemsParams.java
@@ -0,0 +1,3029 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class UpdateSubscriptionQuoteForItemsParams {
+
+  private final String name;
+
+  private final String notes;
+
+  private final Timestamp expiresAt;
+
+  private final List<String> mandatoryItemsToRemove;
+
+  private final Boolean replaceItemsList;
+
+  private final Integer billingCycles;
+
+  private final Integer termsToCharge;
+
+  private final Timestamp reactivateFrom;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final Boolean replaceCouponList;
+
+  private final ChangeOption changeOption;
+
+  private final Timestamp changesScheduledAt;
+
+  private final Boolean forceTermReset;
+
+  private final Boolean reactivate;
+
+  private final Integer netTermDays;
+
+  private final SubscriptionParams subscription;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final CustomerParams customer;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<CouponsParams> coupons;
+
+  private final Map<String, String> customFields;
+
+  private UpdateSubscriptionQuoteForItemsParams(UpdateSubscriptionQuoteForItemsBuilder builder) {
+
+    this.name = builder.name;
+
+    this.notes = builder.notes;
+
+    this.expiresAt = builder.expiresAt;
+
+    this.mandatoryItemsToRemove = builder.mandatoryItemsToRemove;
+
+    this.replaceItemsList = builder.replaceItemsList;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.reactivateFrom = builder.reactivateFrom;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.replaceCouponList = builder.replaceCouponList;
+
+    this.changeOption = builder.changeOption;
+
+    this.changesScheduledAt = builder.changesScheduledAt;
+
+    this.forceTermReset = builder.forceTermReset;
+
+    this.reactivate = builder.reactivate;
+
+    this.netTermDays = builder.netTermDays;
+
+    this.subscription = builder.subscription;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.customer = builder.customer;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.discounts = builder.discounts;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.coupons = builder.coupons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getNotes() {
+    return notes;
+  }
+
+  public Timestamp getExpiresAt() {
+    return expiresAt;
+  }
+
+  public List<String> getMandatoryItemsToRemove() {
+    return mandatoryItemsToRemove;
+  }
+
+  public Boolean getReplaceItemsList() {
+    return replaceItemsList;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public Timestamp getReactivateFrom() {
+    return reactivateFrom;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public Boolean getReplaceCouponList() {
+    return replaceCouponList;
+  }
+
+  public ChangeOption getChangeOption() {
+    return changeOption;
+  }
+
+  public Timestamp getChangesScheduledAt() {
+    return changesScheduledAt;
+  }
+
+  public Boolean getForceTermReset() {
+    return forceTermReset;
+  }
+
+  public Boolean getReactivate() {
+    return reactivate;
+  }
+
+  public Integer getNetTermDays() {
+    return netTermDays;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<CouponsParams> getCoupons() {
+    return coupons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.notes != null) {
+
+      formData.put("notes", this.notes);
+    }
+
+    if (this.expiresAt != null) {
+
+      formData.put("expires_at", this.expiresAt);
+    }
+
+    if (this.mandatoryItemsToRemove != null) {
+
+      formData.put("mandatory_items_to_remove", this.mandatoryItemsToRemove);
+    }
+
+    if (this.replaceItemsList != null) {
+
+      formData.put("replace_items_list", this.replaceItemsList);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.reactivateFrom != null) {
+
+      formData.put("reactivate_from", this.reactivateFrom);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.replaceCouponList != null) {
+
+      formData.put("replace_coupon_list", this.replaceCouponList);
+    }
+
+    if (this.changeOption != null) {
+
+      formData.put("change_option", this.changeOption);
+    }
+
+    if (this.changesScheduledAt != null) {
+
+      formData.put("changes_scheduled_at", this.changesScheduledAt);
+    }
+
+    if (this.forceTermReset != null) {
+
+      formData.put("force_term_reset", this.forceTermReset);
+    }
+
+    if (this.reactivate != null) {
+
+      formData.put("reactivate", this.reactivate);
+    }
+
+    if (this.netTermDays != null) {
+
+      formData.put("net_term_days", this.netTermDays);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.coupons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.coupons.size(); i++) {
+        CouponsParams item = this.coupons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for UpdateSubscriptionQuoteForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UpdateSubscriptionQuoteForItemsBuilder builder() {
+    return new UpdateSubscriptionQuoteForItemsBuilder();
+  }
+
+  public static final class UpdateSubscriptionQuoteForItemsBuilder {
+
+    private String name;
+
+    private String notes;
+
+    private Timestamp expiresAt;
+
+    private List<String> mandatoryItemsToRemove;
+
+    private Boolean replaceItemsList;
+
+    private Integer billingCycles;
+
+    private Integer termsToCharge;
+
+    private Timestamp reactivateFrom;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private Boolean replaceCouponList;
+
+    private ChangeOption changeOption;
+
+    private Timestamp changesScheduledAt;
+
+    private Boolean forceTermReset;
+
+    private Boolean reactivate;
+
+    private Integer netTermDays;
+
+    private SubscriptionParams subscription;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private CustomerParams customer;
+
+    private ContractTermParams contractTerm;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<DiscountsParams> discounts;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<CouponsParams> coupons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private UpdateSubscriptionQuoteForItemsBuilder() {}
+
+    public UpdateSubscriptionQuoteForItemsBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder notes(String value) {
+      this.notes = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder expiresAt(Timestamp value) {
+      this.expiresAt = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder mandatoryItemsToRemove(List<String> value) {
+      this.mandatoryItemsToRemove = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder replaceItemsList(Boolean value) {
+      this.replaceItemsList = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder reactivateFrom(Timestamp value) {
+      this.reactivateFrom = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder replaceCouponList(Boolean value) {
+      this.replaceCouponList = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder changeOption(ChangeOption value) {
+      this.changeOption = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder changesScheduledAt(Timestamp value) {
+      this.changesScheduledAt = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder forceTermReset(Boolean value) {
+      this.forceTermReset = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder reactivate(Boolean value) {
+      this.reactivate = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder netTermDays(Integer value) {
+      this.netTermDays = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsBuilder coupons(List<CouponsParams> value) {
+      this.coupons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public UpdateSubscriptionQuoteForItemsBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public UpdateSubscriptionQuoteForItemsBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsParams build() {
+      return new UpdateSubscriptionQuoteForItemsParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChangeOption {
+    IMMEDIATELY("immediately"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChangeOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChangeOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChangeOption enumValue : ChangeOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final Long setupFee;
+
+    private final Timestamp startDate;
+
+    private final Timestamp trialEnd;
+
+    private final String coupon;
+
+    private final AutoCollection autoCollection;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.setupFee = builder.setupFee;
+
+      this.startDate = builder.startDate;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.coupon = builder.coupon;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public String getCoupon() {
+      return coupon;
+    }
+
+    public AutoCollection getAutoCollection() {
+      return autoCollection;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.coupon != null) {
+
+        formData.put("coupon", this.coupon);
+      }
+
+      if (this.autoCollection != null) {
+
+        formData.put("auto_collection", this.autoCollection);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private Long setupFee;
+
+      private Timestamp startDate;
+
+      private Timestamp trialEnd;
+
+      private String coupon;
+
+      private AutoCollection autoCollection;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder coupon(String value) {
+        this.coupon = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCollection(AutoCollection value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum AutoCollection {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AutoCollection(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AutoCollection fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AutoCollection enumValue : AutoCollection.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final Boolean registeredForGst;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.registeredForGst = builder.registeredForGst;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public Boolean getRegisteredForGst() {
+      return registeredForGst;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.registeredForGst != null) {
+
+        formData.put("registered_for_gst", this.registeredForGst);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private Boolean registeredForGst;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder registeredForGst(Boolean value) {
+        this.registeredForGst = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private final ItemType itemType;
+
+    private final Timestamp startDate;
+
+    private final Timestamp endDate;
+
+    private final String rampTierId;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOnOption = builder.chargeOnOption;
+
+      this.itemType = builder.itemType;
+
+      this.startDate = builder.startDate;
+
+      this.endDate = builder.endDate;
+
+      this.rampTierId = builder.rampTierId;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    public String getRampTierId() {
+      return rampTierId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      if (this.rampTierId != null) {
+
+        formData.put("ramp_tier_id", this.rampTierId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOnOption chargeOnOption;
+
+      private ItemType itemType;
+
+      private Timestamp startDate;
+
+      private Timestamp endDate;
+
+      private String rampTierId;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder rampTierId(String value) {
+        this.rampTierId = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final OperationType operationType;
+
+    private final String id;
+
+    private final Timestamp startDate;
+
+    private final Timestamp endDate;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.operationType = builder.operationType;
+
+      this.id = builder.id;
+
+      this.startDate = builder.startDate;
+
+      this.endDate = builder.endDate;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public OperationType getOperationType() {
+      return operationType;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.operationType != null) {
+
+        formData.put("operation_type", this.operationType);
+      }
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private OperationType operationType;
+
+      private String id;
+
+      private Timestamp startDate;
+
+      private Timestamp endDate;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder operationType(OperationType value) {
+        this.operationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public DiscountsBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public DiscountsBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OperationType {
+      ADD("add"),
+
+      REMOVE("remove"),
+
+      /** An enum member indicating that OperationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OperationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OperationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OperationType enumValue : OperationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private final String rampTierId;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+
+      this.rampTierId = builder.rampTierId;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    public String getRampTierId() {
+      return rampTierId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      if (this.rampTierId != null) {
+
+        formData.put("ramp_tier_id", this.rampTierId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private String rampTierId;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersBuilder rampTierId(String value) {
+        this.rampTierId = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponsParams {
+
+    private final String id;
+
+    private final Timestamp startDate;
+
+    private final Timestamp endDate;
+
+    private CouponsParams(CouponsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.startDate = builder.startDate;
+
+      this.endDate = builder.endDate;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsBuilder builder() {
+      return new CouponsBuilder();
+    }
+
+    public static final class CouponsBuilder {
+
+      private String id;
+
+      private Timestamp startDate;
+
+      private Timestamp endDate;
+
+      private CouponsBuilder() {}
+
+      public CouponsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CouponsBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public CouponsBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public CouponsParams build() {
+        return new CouponsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/params/UpdateSubscriptionQuoteParams.java b/src/main/java/com/chargebee/v4/models/quote/params/UpdateSubscriptionQuoteParams.java
new file mode 100644
index 00000000..6d160db1
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/params/UpdateSubscriptionQuoteParams.java
@@ -0,0 +1,2261 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.quote.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class UpdateSubscriptionQuoteParams {
+
+  private final String name;
+
+  private final String notes;
+
+  private final Timestamp expiresAt;
+
+  private final Boolean replaceAddonList;
+
+  private final List<String> mandatoryAddonsToRemove;
+
+  private final Integer billingCycles;
+
+  private final Integer termsToCharge;
+
+  private final Timestamp reactivateFrom;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final List<String> couponIds;
+
+  private final Boolean replaceCouponList;
+
+  private final ChangeOption changeOption;
+
+  private final Timestamp changesScheduledAt;
+
+  private final Boolean forceTermReset;
+
+  private final Boolean reactivate;
+
+  private final SubscriptionParams subscription;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final CustomerParams customer;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<AddonsParams> addons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private UpdateSubscriptionQuoteParams(UpdateSubscriptionQuoteBuilder builder) {
+
+    this.name = builder.name;
+
+    this.notes = builder.notes;
+
+    this.expiresAt = builder.expiresAt;
+
+    this.replaceAddonList = builder.replaceAddonList;
+
+    this.mandatoryAddonsToRemove = builder.mandatoryAddonsToRemove;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.reactivateFrom = builder.reactivateFrom;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.couponIds = builder.couponIds;
+
+    this.replaceCouponList = builder.replaceCouponList;
+
+    this.changeOption = builder.changeOption;
+
+    this.changesScheduledAt = builder.changesScheduledAt;
+
+    this.forceTermReset = builder.forceTermReset;
+
+    this.reactivate = builder.reactivate;
+
+    this.subscription = builder.subscription;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.customer = builder.customer;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.addons = builder.addons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getNotes() {
+    return notes;
+  }
+
+  public Timestamp getExpiresAt() {
+    return expiresAt;
+  }
+
+  public Boolean getReplaceAddonList() {
+    return replaceAddonList;
+  }
+
+  public List<String> getMandatoryAddonsToRemove() {
+    return mandatoryAddonsToRemove;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public Timestamp getReactivateFrom() {
+    return reactivateFrom;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public Boolean getReplaceCouponList() {
+    return replaceCouponList;
+  }
+
+  public ChangeOption getChangeOption() {
+    return changeOption;
+  }
+
+  public Timestamp getChangesScheduledAt() {
+    return changesScheduledAt;
+  }
+
+  public Boolean getForceTermReset() {
+    return forceTermReset;
+  }
+
+  public Boolean getReactivate() {
+    return reactivate;
+  }
+
+  public SubscriptionParams getSubscription() {
+    return subscription;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.notes != null) {
+
+      formData.put("notes", this.notes);
+    }
+
+    if (this.expiresAt != null) {
+
+      formData.put("expires_at", this.expiresAt);
+    }
+
+    if (this.replaceAddonList != null) {
+
+      formData.put("replace_addon_list", this.replaceAddonList);
+    }
+
+    if (this.mandatoryAddonsToRemove != null) {
+
+      formData.put("mandatory_addons_to_remove", this.mandatoryAddonsToRemove);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.reactivateFrom != null) {
+
+      formData.put("reactivate_from", this.reactivateFrom);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.replaceCouponList != null) {
+
+      formData.put("replace_coupon_list", this.replaceCouponList);
+    }
+
+    if (this.changeOption != null) {
+
+      formData.put("change_option", this.changeOption);
+    }
+
+    if (this.changesScheduledAt != null) {
+
+      formData.put("changes_scheduled_at", this.changesScheduledAt);
+    }
+
+    if (this.forceTermReset != null) {
+
+      formData.put("force_term_reset", this.forceTermReset);
+    }
+
+    if (this.reactivate != null) {
+
+      formData.put("reactivate", this.reactivate);
+    }
+
+    if (this.subscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.subscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for UpdateSubscriptionQuoteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UpdateSubscriptionQuoteBuilder builder() {
+    return new UpdateSubscriptionQuoteBuilder();
+  }
+
+  public static final class UpdateSubscriptionQuoteBuilder {
+
+    private String name;
+
+    private String notes;
+
+    private Timestamp expiresAt;
+
+    private Boolean replaceAddonList;
+
+    private List<String> mandatoryAddonsToRemove;
+
+    private Integer billingCycles;
+
+    private Integer termsToCharge;
+
+    private Timestamp reactivateFrom;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private List<String> couponIds;
+
+    private Boolean replaceCouponList;
+
+    private ChangeOption changeOption;
+
+    private Timestamp changesScheduledAt;
+
+    private Boolean forceTermReset;
+
+    private Boolean reactivate;
+
+    private SubscriptionParams subscription;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private CustomerParams customer;
+
+    private ContractTermParams contractTerm;
+
+    private List<AddonsParams> addons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private UpdateSubscriptionQuoteBuilder() {}
+
+    public UpdateSubscriptionQuoteBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder notes(String value) {
+      this.notes = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder expiresAt(Timestamp value) {
+      this.expiresAt = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder replaceAddonList(Boolean value) {
+      this.replaceAddonList = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder mandatoryAddonsToRemove(List<String> value) {
+      this.mandatoryAddonsToRemove = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder reactivateFrom(Timestamp value) {
+      this.reactivateFrom = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder replaceCouponList(Boolean value) {
+      this.replaceCouponList = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder changeOption(ChangeOption value) {
+      this.changeOption = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder changesScheduledAt(Timestamp value) {
+      this.changesScheduledAt = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder forceTermReset(Boolean value) {
+      this.forceTermReset = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder reactivate(Boolean value) {
+      this.reactivate = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder subscription(SubscriptionParams value) {
+      this.subscription = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteParams build() {
+      return new UpdateSubscriptionQuoteParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChangeOption {
+    IMMEDIATELY("immediately"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChangeOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChangeOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChangeOption enumValue : ChangeOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionParams {
+
+    private final String id;
+
+    private final String planId;
+
+    private final Integer planQuantity;
+
+    private final Long planUnitPrice;
+
+    private final Long setupFee;
+
+    private final String planQuantityInDecimal;
+
+    private final String planUnitPriceInDecimal;
+
+    private final Timestamp startDate;
+
+    private final Timestamp trialEnd;
+
+    private final String coupon;
+
+    private final AutoCollection autoCollection;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Integer contractTermBillingCycleOnRenewal;
+
+    private SubscriptionParams(SubscriptionBuilder builder) {
+
+      this.id = builder.id;
+
+      this.planId = builder.planId;
+
+      this.planQuantity = builder.planQuantity;
+
+      this.planUnitPrice = builder.planUnitPrice;
+
+      this.setupFee = builder.setupFee;
+
+      this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+      this.planUnitPriceInDecimal = builder.planUnitPriceInDecimal;
+
+      this.startDate = builder.startDate;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.coupon = builder.coupon;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getPlanId() {
+      return planId;
+    }
+
+    public Integer getPlanQuantity() {
+      return planQuantity;
+    }
+
+    public Long getPlanUnitPrice() {
+      return planUnitPrice;
+    }
+
+    public Long getSetupFee() {
+      return setupFee;
+    }
+
+    public String getPlanQuantityInDecimal() {
+      return planQuantityInDecimal;
+    }
+
+    public String getPlanUnitPriceInDecimal() {
+      return planUnitPriceInDecimal;
+    }
+
+    public Timestamp getStartDate() {
+      return startDate;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public String getCoupon() {
+      return coupon;
+    }
+
+    public AutoCollection getAutoCollection() {
+      return autoCollection;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Integer getContractTermBillingCycleOnRenewal() {
+      return contractTermBillingCycleOnRenewal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.planId != null) {
+
+        formData.put("plan_id", this.planId);
+      }
+
+      if (this.planQuantity != null) {
+
+        formData.put("plan_quantity", this.planQuantity);
+      }
+
+      if (this.planUnitPrice != null) {
+
+        formData.put("plan_unit_price", this.planUnitPrice);
+      }
+
+      if (this.setupFee != null) {
+
+        formData.put("setup_fee", this.setupFee);
+      }
+
+      if (this.planQuantityInDecimal != null) {
+
+        formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+      }
+
+      if (this.planUnitPriceInDecimal != null) {
+
+        formData.put("plan_unit_price_in_decimal", this.planUnitPriceInDecimal);
+      }
+
+      if (this.startDate != null) {
+
+        formData.put("start_date", this.startDate);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.coupon != null) {
+
+        formData.put("coupon", this.coupon);
+      }
+
+      if (this.autoCollection != null) {
+
+        formData.put("auto_collection", this.autoCollection);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.contractTermBillingCycleOnRenewal != null) {
+
+        formData.put(
+            "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionBuilder builder() {
+      return new SubscriptionBuilder();
+    }
+
+    public static final class SubscriptionBuilder {
+
+      private String id;
+
+      private String planId;
+
+      private Integer planQuantity;
+
+      private Long planUnitPrice;
+
+      private Long setupFee;
+
+      private String planQuantityInDecimal;
+
+      private String planUnitPriceInDecimal;
+
+      private Timestamp startDate;
+
+      private Timestamp trialEnd;
+
+      private String coupon;
+
+      private AutoCollection autoCollection;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Integer contractTermBillingCycleOnRenewal;
+
+      private SubscriptionBuilder() {}
+
+      public SubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planId(String value) {
+        this.planId = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantity(Integer value) {
+        this.planQuantity = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPrice(Long value) {
+        this.planUnitPrice = value;
+        return this;
+      }
+
+      public SubscriptionBuilder setupFee(Long value) {
+        this.setupFee = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planQuantityInDecimal(String value) {
+        this.planQuantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder planUnitPriceInDecimal(String value) {
+        this.planUnitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionBuilder startDate(Timestamp value) {
+        this.startDate = value;
+        return this;
+      }
+
+      public SubscriptionBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public SubscriptionBuilder coupon(String value) {
+        this.coupon = value;
+        return this;
+      }
+
+      public SubscriptionBuilder autoCollection(AutoCollection value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public SubscriptionBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public SubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+        this.contractTermBillingCycleOnRenewal = value;
+        return this;
+      }
+
+      public SubscriptionParams build() {
+        return new SubscriptionParams(this);
+      }
+    }
+
+    public enum AutoCollection {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AutoCollection(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AutoCollection fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AutoCollection enumValue : AutoCollection.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final Boolean registeredForGst;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.registeredForGst = builder.registeredForGst;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public Boolean getRegisteredForGst() {
+      return registeredForGst;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.registeredForGst != null) {
+
+        formData.put("registered_for_gst", this.registeredForGst);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private Boolean registeredForGst;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder registeredForGst(Boolean value) {
+        this.registeredForGst = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final Integer billingCycles;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp trialEnd;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.trialEnd = builder.trialEnd;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private Integer billingCycles;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp trialEnd;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final Integer servicePeriodInDays;
+
+    private final ChargeOn chargeOn;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+
+      this.chargeOn = builder.chargeOn;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    public ChargeOn getChargeOn() {
+      return chargeOn;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      if (this.chargeOn != null) {
+
+        formData.put("charge_on", this.chargeOn);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private Integer servicePeriodInDays;
+
+      private ChargeOn chargeOn;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
+        this.chargeOn = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum ChargeOn {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOn enumValue : ChargeOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/responses/CreateSubscriptionForCustomerQuoteResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/CreateSubscriptionForCustomerQuoteResponse.java
new file mode 100644
index 00000000..16663ef1
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/CreateSubscriptionForCustomerQuoteResponse.java
@@ -0,0 +1,104 @@
+package com.chargebee.v4.models.quote.responses;
+
+import com.chargebee.v4.models.quote.Quote;
+
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CreateSubscriptionForCustomerQuote operation. Contains the response
+ * data from the API.
+ */
+public final class CreateSubscriptionForCustomerQuoteResponse extends BaseResponse {
+  private final Quote quote;
+
+  private final QuotedSubscription quotedSubscription;
+
+  private CreateSubscriptionForCustomerQuoteResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.quote = builder.quote;
+
+    this.quotedSubscription = builder.quotedSubscription;
+  }
+
+  /** Parse JSON response into CreateSubscriptionForCustomerQuoteResponse object. */
+  public static CreateSubscriptionForCustomerQuoteResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into CreateSubscriptionForCustomerQuoteResponse object with HTTP response.
+   */
+  public static CreateSubscriptionForCustomerQuoteResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __quoteJson = JsonUtil.getObject(json, "quote");
+      if (__quoteJson != null) {
+        builder.quote(Quote.fromJson(__quoteJson));
+      }
+
+      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
+      if (__quotedSubscriptionJson != null) {
+        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse CreateSubscriptionForCustomerQuoteResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CreateSubscriptionForCustomerQuoteResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CreateSubscriptionForCustomerQuoteResponse. */
+  public static class Builder {
+
+    private Quote quote;
+
+    private QuotedSubscription quotedSubscription;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder quote(Quote quote) {
+      this.quote = quote;
+      return this;
+    }
+
+    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
+      this.quotedSubscription = quotedSubscription;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CreateSubscriptionForCustomerQuoteResponse build() {
+      return new CreateSubscriptionForCustomerQuoteResponse(this);
+    }
+  }
+
+  /** Get the quote from the response. */
+  public Quote getQuote() {
+    return quote;
+  }
+
+  /** Get the quotedSubscription from the response. */
+  public QuotedSubscription getQuotedSubscription() {
+    return quotedSubscription;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/responses/CreateSubscriptionItemsForCustomerQuoteResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/CreateSubscriptionItemsForCustomerQuoteResponse.java
new file mode 100644
index 00000000..190bcb6e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/CreateSubscriptionItemsForCustomerQuoteResponse.java
@@ -0,0 +1,128 @@
+package com.chargebee.v4.models.quote.responses;
+
+import com.chargebee.v4.models.quote.Quote;
+
+import com.chargebee.v4.models.quotedRamp.QuotedRamp;
+
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CreateSubscriptionItemsForCustomerQuote operation. Contains the
+ * response data from the API.
+ */
+public final class CreateSubscriptionItemsForCustomerQuoteResponse extends BaseResponse {
+  private final Quote quote;
+
+  private final QuotedSubscription quotedSubscription;
+
+  private final QuotedRamp quotedRamp;
+
+  private CreateSubscriptionItemsForCustomerQuoteResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.quote = builder.quote;
+
+    this.quotedSubscription = builder.quotedSubscription;
+
+    this.quotedRamp = builder.quotedRamp;
+  }
+
+  /** Parse JSON response into CreateSubscriptionItemsForCustomerQuoteResponse object. */
+  public static CreateSubscriptionItemsForCustomerQuoteResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into CreateSubscriptionItemsForCustomerQuoteResponse object with HTTP
+   * response.
+   */
+  public static CreateSubscriptionItemsForCustomerQuoteResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __quoteJson = JsonUtil.getObject(json, "quote");
+      if (__quoteJson != null) {
+        builder.quote(Quote.fromJson(__quoteJson));
+      }
+
+      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
+      if (__quotedSubscriptionJson != null) {
+        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
+      }
+
+      String __quotedRampJson = JsonUtil.getObject(json, "quoted_ramp");
+      if (__quotedRampJson != null) {
+        builder.quotedRamp(QuotedRamp.fromJson(__quotedRampJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse CreateSubscriptionItemsForCustomerQuoteResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CreateSubscriptionItemsForCustomerQuoteResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CreateSubscriptionItemsForCustomerQuoteResponse. */
+  public static class Builder {
+
+    private Quote quote;
+
+    private QuotedSubscription quotedSubscription;
+
+    private QuotedRamp quotedRamp;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder quote(Quote quote) {
+      this.quote = quote;
+      return this;
+    }
+
+    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
+      this.quotedSubscription = quotedSubscription;
+      return this;
+    }
+
+    public Builder quotedRamp(QuotedRamp quotedRamp) {
+      this.quotedRamp = quotedRamp;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CreateSubscriptionItemsForCustomerQuoteResponse build() {
+      return new CreateSubscriptionItemsForCustomerQuoteResponse(this);
+    }
+  }
+
+  /** Get the quote from the response. */
+  public Quote getQuote() {
+    return quote;
+  }
+
+  /** Get the quotedSubscription from the response. */
+  public QuotedSubscription getQuotedSubscription() {
+    return quotedSubscription;
+  }
+
+  /** Get the quotedRamp from the response. */
+  public QuotedRamp getQuotedRamp() {
+    return quotedRamp;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/responses/EditCreateSubscriptionCustomerQuoteForItemsResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/EditCreateSubscriptionCustomerQuoteForItemsResponse.java
new file mode 100644
index 00000000..d081dc1e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/EditCreateSubscriptionCustomerQuoteForItemsResponse.java
@@ -0,0 +1,128 @@
+package com.chargebee.v4.models.quote.responses;
+
+import com.chargebee.v4.models.quote.Quote;
+
+import com.chargebee.v4.models.quotedRamp.QuotedRamp;
+
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for EditCreateSubscriptionCustomerQuoteForItems operation. Contains the
+ * response data from the API.
+ */
+public final class EditCreateSubscriptionCustomerQuoteForItemsResponse extends BaseResponse {
+  private final Quote quote;
+
+  private final QuotedSubscription quotedSubscription;
+
+  private final QuotedRamp quotedRamp;
+
+  private EditCreateSubscriptionCustomerQuoteForItemsResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.quote = builder.quote;
+
+    this.quotedSubscription = builder.quotedSubscription;
+
+    this.quotedRamp = builder.quotedRamp;
+  }
+
+  /** Parse JSON response into EditCreateSubscriptionCustomerQuoteForItemsResponse object. */
+  public static EditCreateSubscriptionCustomerQuoteForItemsResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into EditCreateSubscriptionCustomerQuoteForItemsResponse object with HTTP
+   * response.
+   */
+  public static EditCreateSubscriptionCustomerQuoteForItemsResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __quoteJson = JsonUtil.getObject(json, "quote");
+      if (__quoteJson != null) {
+        builder.quote(Quote.fromJson(__quoteJson));
+      }
+
+      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
+      if (__quotedSubscriptionJson != null) {
+        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
+      }
+
+      String __quotedRampJson = JsonUtil.getObject(json, "quoted_ramp");
+      if (__quotedRampJson != null) {
+        builder.quotedRamp(QuotedRamp.fromJson(__quotedRampJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse EditCreateSubscriptionCustomerQuoteForItemsResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for EditCreateSubscriptionCustomerQuoteForItemsResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for EditCreateSubscriptionCustomerQuoteForItemsResponse. */
+  public static class Builder {
+
+    private Quote quote;
+
+    private QuotedSubscription quotedSubscription;
+
+    private QuotedRamp quotedRamp;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder quote(Quote quote) {
+      this.quote = quote;
+      return this;
+    }
+
+    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
+      this.quotedSubscription = quotedSubscription;
+      return this;
+    }
+
+    public Builder quotedRamp(QuotedRamp quotedRamp) {
+      this.quotedRamp = quotedRamp;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public EditCreateSubscriptionCustomerQuoteForItemsResponse build() {
+      return new EditCreateSubscriptionCustomerQuoteForItemsResponse(this);
+    }
+  }
+
+  /** Get the quote from the response. */
+  public Quote getQuote() {
+    return quote;
+  }
+
+  /** Get the quotedSubscription from the response. */
+  public QuotedSubscription getQuotedSubscription() {
+    return quotedSubscription;
+  }
+
+  /** Get the quotedRamp from the response. */
+  public QuotedRamp getQuotedRamp() {
+    return quotedRamp;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/responses/EditCreateSubscriptionForCustomerQuoteResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/EditCreateSubscriptionForCustomerQuoteResponse.java
new file mode 100644
index 00000000..159d51d1
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/EditCreateSubscriptionForCustomerQuoteResponse.java
@@ -0,0 +1,105 @@
+package com.chargebee.v4.models.quote.responses;
+
+import com.chargebee.v4.models.quote.Quote;
+
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for EditCreateSubscriptionForCustomerQuote operation. Contains the
+ * response data from the API.
+ */
+public final class EditCreateSubscriptionForCustomerQuoteResponse extends BaseResponse {
+  private final Quote quote;
+
+  private final QuotedSubscription quotedSubscription;
+
+  private EditCreateSubscriptionForCustomerQuoteResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.quote = builder.quote;
+
+    this.quotedSubscription = builder.quotedSubscription;
+  }
+
+  /** Parse JSON response into EditCreateSubscriptionForCustomerQuoteResponse object. */
+  public static EditCreateSubscriptionForCustomerQuoteResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into EditCreateSubscriptionForCustomerQuoteResponse object with HTTP
+   * response.
+   */
+  public static EditCreateSubscriptionForCustomerQuoteResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __quoteJson = JsonUtil.getObject(json, "quote");
+      if (__quoteJson != null) {
+        builder.quote(Quote.fromJson(__quoteJson));
+      }
+
+      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
+      if (__quotedSubscriptionJson != null) {
+        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse EditCreateSubscriptionForCustomerQuoteResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for EditCreateSubscriptionForCustomerQuoteResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for EditCreateSubscriptionForCustomerQuoteResponse. */
+  public static class Builder {
+
+    private Quote quote;
+
+    private QuotedSubscription quotedSubscription;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder quote(Quote quote) {
+      this.quote = quote;
+      return this;
+    }
+
+    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
+      this.quotedSubscription = quotedSubscription;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public EditCreateSubscriptionForCustomerQuoteResponse build() {
+      return new EditCreateSubscriptionForCustomerQuoteResponse(this);
+    }
+  }
+
+  /** Get the quote from the response. */
+  public Quote getQuote() {
+    return quote;
+  }
+
+  /** Get the quotedSubscription from the response. */
+  public QuotedSubscription getQuotedSubscription() {
+    return quotedSubscription;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/responses/EditOneTimeQuoteResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/EditOneTimeQuoteResponse.java
new file mode 100644
index 00000000..b0290dee
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/EditOneTimeQuoteResponse.java
@@ -0,0 +1,100 @@
+package com.chargebee.v4.models.quote.responses;
+
+import com.chargebee.v4.models.quote.Quote;
+
+import com.chargebee.v4.models.quotedCharge.QuotedCharge;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for EditOneTimeQuote operation. Contains the response data from the
+ * API.
+ */
+public final class EditOneTimeQuoteResponse extends BaseResponse {
+  private final Quote quote;
+
+  private final QuotedCharge quotedCharge;
+
+  private EditOneTimeQuoteResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.quote = builder.quote;
+
+    this.quotedCharge = builder.quotedCharge;
+  }
+
+  /** Parse JSON response into EditOneTimeQuoteResponse object. */
+  public static EditOneTimeQuoteResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into EditOneTimeQuoteResponse object with HTTP response. */
+  public static EditOneTimeQuoteResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __quoteJson = JsonUtil.getObject(json, "quote");
+      if (__quoteJson != null) {
+        builder.quote(Quote.fromJson(__quoteJson));
+      }
+
+      String __quotedChargeJson = JsonUtil.getObject(json, "quoted_charge");
+      if (__quotedChargeJson != null) {
+        builder.quotedCharge(QuotedCharge.fromJson(__quotedChargeJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse EditOneTimeQuoteResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for EditOneTimeQuoteResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for EditOneTimeQuoteResponse. */
+  public static class Builder {
+
+    private Quote quote;
+
+    private QuotedCharge quotedCharge;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder quote(Quote quote) {
+      this.quote = quote;
+      return this;
+    }
+
+    public Builder quotedCharge(QuotedCharge quotedCharge) {
+      this.quotedCharge = quotedCharge;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public EditOneTimeQuoteResponse build() {
+      return new EditOneTimeQuoteResponse(this);
+    }
+  }
+
+  /** Get the quote from the response. */
+  public Quote getQuote() {
+    return quote;
+  }
+
+  /** Get the quotedCharge from the response. */
+  public QuotedCharge getQuotedCharge() {
+    return quotedCharge;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/responses/EditUpdateSubscriptionQuoteForItemsResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/EditUpdateSubscriptionQuoteForItemsResponse.java
new file mode 100644
index 00000000..8c2efa35
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/EditUpdateSubscriptionQuoteForItemsResponse.java
@@ -0,0 +1,127 @@
+package com.chargebee.v4.models.quote.responses;
+
+import com.chargebee.v4.models.quote.Quote;
+
+import com.chargebee.v4.models.quotedRamp.QuotedRamp;
+
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for EditUpdateSubscriptionQuoteForItems operation. Contains the
+ * response data from the API.
+ */
+public final class EditUpdateSubscriptionQuoteForItemsResponse extends BaseResponse {
+  private final Quote quote;
+
+  private final QuotedSubscription quotedSubscription;
+
+  private final QuotedRamp quotedRamp;
+
+  private EditUpdateSubscriptionQuoteForItemsResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.quote = builder.quote;
+
+    this.quotedSubscription = builder.quotedSubscription;
+
+    this.quotedRamp = builder.quotedRamp;
+  }
+
+  /** Parse JSON response into EditUpdateSubscriptionQuoteForItemsResponse object. */
+  public static EditUpdateSubscriptionQuoteForItemsResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into EditUpdateSubscriptionQuoteForItemsResponse object with HTTP response.
+   */
+  public static EditUpdateSubscriptionQuoteForItemsResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __quoteJson = JsonUtil.getObject(json, "quote");
+      if (__quoteJson != null) {
+        builder.quote(Quote.fromJson(__quoteJson));
+      }
+
+      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
+      if (__quotedSubscriptionJson != null) {
+        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
+      }
+
+      String __quotedRampJson = JsonUtil.getObject(json, "quoted_ramp");
+      if (__quotedRampJson != null) {
+        builder.quotedRamp(QuotedRamp.fromJson(__quotedRampJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse EditUpdateSubscriptionQuoteForItemsResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for EditUpdateSubscriptionQuoteForItemsResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for EditUpdateSubscriptionQuoteForItemsResponse. */
+  public static class Builder {
+
+    private Quote quote;
+
+    private QuotedSubscription quotedSubscription;
+
+    private QuotedRamp quotedRamp;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder quote(Quote quote) {
+      this.quote = quote;
+      return this;
+    }
+
+    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
+      this.quotedSubscription = quotedSubscription;
+      return this;
+    }
+
+    public Builder quotedRamp(QuotedRamp quotedRamp) {
+      this.quotedRamp = quotedRamp;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteForItemsResponse build() {
+      return new EditUpdateSubscriptionQuoteForItemsResponse(this);
+    }
+  }
+
+  /** Get the quote from the response. */
+  public Quote getQuote() {
+    return quote;
+  }
+
+  /** Get the quotedSubscription from the response. */
+  public QuotedSubscription getQuotedSubscription() {
+    return quotedSubscription;
+  }
+
+  /** Get the quotedRamp from the response. */
+  public QuotedRamp getQuotedRamp() {
+    return quotedRamp;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/responses/EditUpdateSubscriptionQuoteResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/EditUpdateSubscriptionQuoteResponse.java
new file mode 100644
index 00000000..210a425a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/EditUpdateSubscriptionQuoteResponse.java
@@ -0,0 +1,101 @@
+package com.chargebee.v4.models.quote.responses;
+
+import com.chargebee.v4.models.quote.Quote;
+
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for EditUpdateSubscriptionQuote operation. Contains the response data
+ * from the API.
+ */
+public final class EditUpdateSubscriptionQuoteResponse extends BaseResponse {
+  private final Quote quote;
+
+  private final QuotedSubscription quotedSubscription;
+
+  private EditUpdateSubscriptionQuoteResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.quote = builder.quote;
+
+    this.quotedSubscription = builder.quotedSubscription;
+  }
+
+  /** Parse JSON response into EditUpdateSubscriptionQuoteResponse object. */
+  public static EditUpdateSubscriptionQuoteResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into EditUpdateSubscriptionQuoteResponse object with HTTP response. */
+  public static EditUpdateSubscriptionQuoteResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __quoteJson = JsonUtil.getObject(json, "quote");
+      if (__quoteJson != null) {
+        builder.quote(Quote.fromJson(__quoteJson));
+      }
+
+      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
+      if (__quotedSubscriptionJson != null) {
+        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse EditUpdateSubscriptionQuoteResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for EditUpdateSubscriptionQuoteResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for EditUpdateSubscriptionQuoteResponse. */
+  public static class Builder {
+
+    private Quote quote;
+
+    private QuotedSubscription quotedSubscription;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder quote(Quote quote) {
+      this.quote = quote;
+      return this;
+    }
+
+    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
+      this.quotedSubscription = quotedSubscription;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public EditUpdateSubscriptionQuoteResponse build() {
+      return new EditUpdateSubscriptionQuoteResponse(this);
+    }
+  }
+
+  /** Get the quote from the response. */
+  public Quote getQuote() {
+    return quote;
+  }
+
+  /** Get the quotedSubscription from the response. */
+  public QuotedSubscription getQuotedSubscription() {
+    return quotedSubscription;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteConvertResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteConvertResponse.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/responses/quote/QuoteConvertResponse.java
rename to src/main/java/com/chargebee/v4/models/quote/responses/QuoteConvertResponse.java
index 59976147..da4b9d86 100644
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteConvertResponse.java
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteConvertResponse.java
@@ -1,26 +1,26 @@
-package com.chargebee.v4.core.responses.quote;
+package com.chargebee.v4.models.quote.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.quote.Quote;
+import com.chargebee.v4.models.quote.Quote;
 
-import com.chargebee.v4.core.models.quotedRamp.QuotedRamp;
+import com.chargebee.v4.models.quotedRamp.QuotedRamp;
 
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.quotedCharge.QuotedCharge;
+import com.chargebee.v4.models.quotedCharge.QuotedCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteCreateForChargeItemsAndChargesResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteCreateForChargeItemsAndChargesResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/quote/QuoteCreateForChargeItemsAndChargesResponse.java
rename to src/main/java/com/chargebee/v4/models/quote/responses/QuoteCreateForChargeItemsAndChargesResponse.java
index 8eb13627..fad0c50b 100644
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteCreateForChargeItemsAndChargesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteCreateForChargeItemsAndChargesResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.quote;
+package com.chargebee.v4.models.quote.responses;
 
-import com.chargebee.v4.core.models.quote.Quote;
+import com.chargebee.v4.models.quote.Quote;
 
-import com.chargebee.v4.core.models.quotedCharge.QuotedCharge;
+import com.chargebee.v4.models.quotedCharge.QuotedCharge;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteCreateForOnetimeChargesResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteCreateForOnetimeChargesResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/quote/QuoteCreateForOnetimeChargesResponse.java
rename to src/main/java/com/chargebee/v4/models/quote/responses/QuoteCreateForOnetimeChargesResponse.java
index 79603870..5e29ddc8 100644
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteCreateForOnetimeChargesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteCreateForOnetimeChargesResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.quote;
+package com.chargebee.v4.models.quote.responses;
 
-import com.chargebee.v4.core.models.quote.Quote;
+import com.chargebee.v4.models.quote.Quote;
 
-import com.chargebee.v4.core.models.quotedCharge.QuotedCharge;
+import com.chargebee.v4.models.quotedCharge.QuotedCharge;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteDeleteResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteDeleteResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/quote/QuoteDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/quote/responses/QuoteDeleteResponse.java
index 51dc2ad2..863df81b 100644
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteDeleteResponse.java
@@ -1,14 +1,14 @@
-package com.chargebee.v4.core.responses.quote;
+package com.chargebee.v4.models.quote.responses;
 
-import com.chargebee.v4.core.models.quote.Quote;
+import com.chargebee.v4.models.quote.Quote;
 
-import com.chargebee.v4.core.models.quotedRamp.QuotedRamp;
+import com.chargebee.v4.models.quotedRamp.QuotedRamp;
 
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
 
-import com.chargebee.v4.core.models.quotedCharge.QuotedCharge;
+import com.chargebee.v4.models.quotedCharge.QuotedCharge;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditForChargeItemsAndChargesResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteEditForChargeItemsAndChargesResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditForChargeItemsAndChargesResponse.java
rename to src/main/java/com/chargebee/v4/models/quote/responses/QuoteEditForChargeItemsAndChargesResponse.java
index fd16721c..76f9c521 100644
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteEditForChargeItemsAndChargesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteEditForChargeItemsAndChargesResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.quote;
+package com.chargebee.v4.models.quote.responses;
 
-import com.chargebee.v4.core.models.quote.Quote;
+import com.chargebee.v4.models.quote.Quote;
 
-import com.chargebee.v4.core.models.quotedCharge.QuotedCharge;
+import com.chargebee.v4.models.quotedCharge.QuotedCharge;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteExtendExpiryDateResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteExtendExpiryDateResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/quote/QuoteExtendExpiryDateResponse.java
rename to src/main/java/com/chargebee/v4/models/quote/responses/QuoteExtendExpiryDateResponse.java
index 060406e2..88a36f7b 100644
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteExtendExpiryDateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteExtendExpiryDateResponse.java
@@ -1,14 +1,14 @@
-package com.chargebee.v4.core.responses.quote;
+package com.chargebee.v4.models.quote.responses;
 
-import com.chargebee.v4.core.models.quote.Quote;
+import com.chargebee.v4.models.quote.Quote;
 
-import com.chargebee.v4.core.models.quotedRamp.QuotedRamp;
+import com.chargebee.v4.models.quotedRamp.QuotedRamp;
 
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
 
-import com.chargebee.v4.core.models.quotedCharge.QuotedCharge;
+import com.chargebee.v4.models.quotedCharge.QuotedCharge;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/quote/responses/QuoteLineGroupsForQuoteResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteLineGroupsForQuoteResponse.java
new file mode 100644
index 00000000..3c3706fb
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteLineGroupsForQuoteResponse.java
@@ -0,0 +1,176 @@
+package com.chargebee.v4.models.quote.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.quoteLineGroup.QuoteLineGroup;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.QuoteService;
+import com.chargebee.v4.models.quote.params.QuoteLineGroupsForQuoteParams;
+
+/**
+ * Immutable response object for QuoteLineGroupsForQuote operation. Contains paginated list data.
+ */
+public final class QuoteLineGroupsForQuoteResponse {
+
+  private final List<QuoteQuoteLineGroupsForQuoteItem> list;
+
+  private final String nextOffset;
+
+  private final String quoteId;
+
+  private final QuoteService service;
+  private final QuoteLineGroupsForQuoteParams originalParams;
+  private final Response httpResponse;
+
+  private QuoteLineGroupsForQuoteResponse(
+      List<QuoteQuoteLineGroupsForQuoteItem> list,
+      String nextOffset,
+      String quoteId,
+      QuoteService service,
+      QuoteLineGroupsForQuoteParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.quoteId = quoteId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into QuoteLineGroupsForQuoteResponse object (no service context). Use this
+   * when you only need to read a single page (no nextPage()).
+   */
+  public static QuoteLineGroupsForQuoteResponse fromJson(String json) {
+    try {
+
+      List<QuoteQuoteLineGroupsForQuoteItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(QuoteQuoteLineGroupsForQuoteItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new QuoteLineGroupsForQuoteResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse QuoteLineGroupsForQuoteResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into QuoteLineGroupsForQuoteResponse object with service context for
+   * pagination (enables nextPage()).
+   */
+  public static QuoteLineGroupsForQuoteResponse fromJson(
+      String json,
+      QuoteService service,
+      QuoteLineGroupsForQuoteParams originalParams,
+      String quoteId,
+      Response httpResponse) {
+    try {
+
+      List<QuoteQuoteLineGroupsForQuoteItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(QuoteQuoteLineGroupsForQuoteItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new QuoteLineGroupsForQuoteResponse(
+          list, nextOffset, quoteId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse QuoteLineGroupsForQuoteResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<QuoteQuoteLineGroupsForQuoteItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public QuoteLineGroupsForQuoteResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    QuoteLineGroupsForQuoteParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : QuoteLineGroupsForQuoteParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.quoteLineGroupsForQuote(quoteId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class QuoteQuoteLineGroupsForQuoteItem {
+
+    private QuoteLineGroup quoteLineGroup;
+
+    public QuoteLineGroup getQuoteLineGroup() {
+      return quoteLineGroup;
+    }
+
+    public static QuoteQuoteLineGroupsForQuoteItem fromJson(String json) {
+      QuoteQuoteLineGroupsForQuoteItem item = new QuoteQuoteLineGroupsForQuoteItem();
+
+      String __quoteLineGroupJson = JsonUtil.getObject(json, "quote_line_group");
+      if (__quoteLineGroupJson != null) {
+        item.quoteLineGroup = QuoteLineGroup.fromJson(__quoteLineGroupJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteListResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/quote/QuoteListResponse.java
rename to src/main/java/com/chargebee/v4/models/quote/responses/QuoteListResponse.java
index a9f32560..4a6b645e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteListResponse.java
@@ -1,17 +1,18 @@
-package com.chargebee.v4.core.responses.quote;
+package com.chargebee.v4.models.quote.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.quote.Quote;
+import com.chargebee.v4.models.quote.Quote;
 
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
 
-import com.chargebee.v4.core.models.quotedRamp.QuotedRamp;
+import com.chargebee.v4.models.quotedRamp.QuotedRamp;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.QuoteService;
-import com.chargebee.v4.core.models.quote.params.QuoteListParams;
+import com.chargebee.v4.services.QuoteService;
+import com.chargebee.v4.models.quote.params.QuoteListParams;
 
 /** Immutable response object for QuoteList operation. Contains paginated list data. */
 public final class QuoteListResponse {
@@ -99,9 +100,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public QuoteListResponse nextPage() throws Exception {
+  public QuoteListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuotePdfResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/QuotePdfResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/quote/QuotePdfResponse.java
rename to src/main/java/com/chargebee/v4/models/quote/responses/QuotePdfResponse.java
index de6f7da3..14b81125 100644
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuotePdfResponse.java
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/QuotePdfResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.quote;
+package com.chargebee.v4.models.quote.responses;
 
-import com.chargebee.v4.core.models.download.Download;
+import com.chargebee.v4.models.download.Download;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/quote/responses/QuoteRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteRetrieveResponse.java
new file mode 100644
index 00000000..dc64583b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteRetrieveResponse.java
@@ -0,0 +1,146 @@
+package com.chargebee.v4.models.quote.responses;
+
+import com.chargebee.v4.models.quote.Quote;
+
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
+
+import com.chargebee.v4.models.quotedCharge.QuotedCharge;
+
+import com.chargebee.v4.models.quotedRamp.QuotedRamp;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for QuoteRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class QuoteRetrieveResponse extends BaseResponse {
+  private final Quote quote;
+
+  private final QuotedSubscription quotedSubscription;
+
+  private final QuotedCharge quotedCharge;
+
+  private final QuotedRamp quotedRamp;
+
+  private QuoteRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.quote = builder.quote;
+
+    this.quotedSubscription = builder.quotedSubscription;
+
+    this.quotedCharge = builder.quotedCharge;
+
+    this.quotedRamp = builder.quotedRamp;
+  }
+
+  /** Parse JSON response into QuoteRetrieveResponse object. */
+  public static QuoteRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into QuoteRetrieveResponse object with HTTP response. */
+  public static QuoteRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __quoteJson = JsonUtil.getObject(json, "quote");
+      if (__quoteJson != null) {
+        builder.quote(Quote.fromJson(__quoteJson));
+      }
+
+      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
+      if (__quotedSubscriptionJson != null) {
+        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
+      }
+
+      String __quotedChargeJson = JsonUtil.getObject(json, "quoted_charge");
+      if (__quotedChargeJson != null) {
+        builder.quotedCharge(QuotedCharge.fromJson(__quotedChargeJson));
+      }
+
+      String __quotedRampJson = JsonUtil.getObject(json, "quoted_ramp");
+      if (__quotedRampJson != null) {
+        builder.quotedRamp(QuotedRamp.fromJson(__quotedRampJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse QuoteRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for QuoteRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for QuoteRetrieveResponse. */
+  public static class Builder {
+
+    private Quote quote;
+
+    private QuotedSubscription quotedSubscription;
+
+    private QuotedCharge quotedCharge;
+
+    private QuotedRamp quotedRamp;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder quote(Quote quote) {
+      this.quote = quote;
+      return this;
+    }
+
+    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
+      this.quotedSubscription = quotedSubscription;
+      return this;
+    }
+
+    public Builder quotedCharge(QuotedCharge quotedCharge) {
+      this.quotedCharge = quotedCharge;
+      return this;
+    }
+
+    public Builder quotedRamp(QuotedRamp quotedRamp) {
+      this.quotedRamp = quotedRamp;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public QuoteRetrieveResponse build() {
+      return new QuoteRetrieveResponse(this);
+    }
+  }
+
+  /** Get the quote from the response. */
+  public Quote getQuote() {
+    return quote;
+  }
+
+  /** Get the quotedSubscription from the response. */
+  public QuotedSubscription getQuotedSubscription() {
+    return quotedSubscription;
+  }
+
+  /** Get the quotedCharge from the response. */
+  public QuotedCharge getQuotedCharge() {
+    return quotedCharge;
+  }
+
+  /** Get the quotedRamp from the response. */
+  public QuotedRamp getQuotedRamp() {
+    return quotedRamp;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteUpdateStatusResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteUpdateStatusResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/quote/QuoteUpdateStatusResponse.java
rename to src/main/java/com/chargebee/v4/models/quote/responses/QuoteUpdateStatusResponse.java
index bb6b7ea5..ad79eece 100644
--- a/src/main/java/com/chargebee/v4/core/responses/quote/QuoteUpdateStatusResponse.java
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/QuoteUpdateStatusResponse.java
@@ -1,14 +1,14 @@
-package com.chargebee.v4.core.responses.quote;
+package com.chargebee.v4.models.quote.responses;
 
-import com.chargebee.v4.core.models.quote.Quote;
+import com.chargebee.v4.models.quote.Quote;
 
-import com.chargebee.v4.core.models.quotedRamp.QuotedRamp;
+import com.chargebee.v4.models.quotedRamp.QuotedRamp;
 
-import com.chargebee.v4.core.models.quotedSubscription.QuotedSubscription;
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
 
-import com.chargebee.v4.core.models.quotedCharge.QuotedCharge;
+import com.chargebee.v4.models.quotedCharge.QuotedCharge;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/quote/responses/UpdateSubscriptionQuoteForItemsResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/UpdateSubscriptionQuoteForItemsResponse.java
new file mode 100644
index 00000000..e73d3a72
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/UpdateSubscriptionQuoteForItemsResponse.java
@@ -0,0 +1,125 @@
+package com.chargebee.v4.models.quote.responses;
+
+import com.chargebee.v4.models.quote.Quote;
+
+import com.chargebee.v4.models.quotedRamp.QuotedRamp;
+
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for UpdateSubscriptionQuoteForItems operation. Contains the response
+ * data from the API.
+ */
+public final class UpdateSubscriptionQuoteForItemsResponse extends BaseResponse {
+  private final Quote quote;
+
+  private final QuotedSubscription quotedSubscription;
+
+  private final QuotedRamp quotedRamp;
+
+  private UpdateSubscriptionQuoteForItemsResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.quote = builder.quote;
+
+    this.quotedSubscription = builder.quotedSubscription;
+
+    this.quotedRamp = builder.quotedRamp;
+  }
+
+  /** Parse JSON response into UpdateSubscriptionQuoteForItemsResponse object. */
+  public static UpdateSubscriptionQuoteForItemsResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into UpdateSubscriptionQuoteForItemsResponse object with HTTP response. */
+  public static UpdateSubscriptionQuoteForItemsResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __quoteJson = JsonUtil.getObject(json, "quote");
+      if (__quoteJson != null) {
+        builder.quote(Quote.fromJson(__quoteJson));
+      }
+
+      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
+      if (__quotedSubscriptionJson != null) {
+        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
+      }
+
+      String __quotedRampJson = JsonUtil.getObject(json, "quoted_ramp");
+      if (__quotedRampJson != null) {
+        builder.quotedRamp(QuotedRamp.fromJson(__quotedRampJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse UpdateSubscriptionQuoteForItemsResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for UpdateSubscriptionQuoteForItemsResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for UpdateSubscriptionQuoteForItemsResponse. */
+  public static class Builder {
+
+    private Quote quote;
+
+    private QuotedSubscription quotedSubscription;
+
+    private QuotedRamp quotedRamp;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder quote(Quote quote) {
+      this.quote = quote;
+      return this;
+    }
+
+    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
+      this.quotedSubscription = quotedSubscription;
+      return this;
+    }
+
+    public Builder quotedRamp(QuotedRamp quotedRamp) {
+      this.quotedRamp = quotedRamp;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteForItemsResponse build() {
+      return new UpdateSubscriptionQuoteForItemsResponse(this);
+    }
+  }
+
+  /** Get the quote from the response. */
+  public Quote getQuote() {
+    return quote;
+  }
+
+  /** Get the quotedSubscription from the response. */
+  public QuotedSubscription getQuotedSubscription() {
+    return quotedSubscription;
+  }
+
+  /** Get the quotedRamp from the response. */
+  public QuotedRamp getQuotedRamp() {
+    return quotedRamp;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/quote/responses/UpdateSubscriptionQuoteResponse.java b/src/main/java/com/chargebee/v4/models/quote/responses/UpdateSubscriptionQuoteResponse.java
new file mode 100644
index 00000000..f162f573
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quote/responses/UpdateSubscriptionQuoteResponse.java
@@ -0,0 +1,100 @@
+package com.chargebee.v4.models.quote.responses;
+
+import com.chargebee.v4.models.quote.Quote;
+
+import com.chargebee.v4.models.quotedSubscription.QuotedSubscription;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for UpdateSubscriptionQuote operation. Contains the response data from
+ * the API.
+ */
+public final class UpdateSubscriptionQuoteResponse extends BaseResponse {
+  private final Quote quote;
+
+  private final QuotedSubscription quotedSubscription;
+
+  private UpdateSubscriptionQuoteResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.quote = builder.quote;
+
+    this.quotedSubscription = builder.quotedSubscription;
+  }
+
+  /** Parse JSON response into UpdateSubscriptionQuoteResponse object. */
+  public static UpdateSubscriptionQuoteResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into UpdateSubscriptionQuoteResponse object with HTTP response. */
+  public static UpdateSubscriptionQuoteResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __quoteJson = JsonUtil.getObject(json, "quote");
+      if (__quoteJson != null) {
+        builder.quote(Quote.fromJson(__quoteJson));
+      }
+
+      String __quotedSubscriptionJson = JsonUtil.getObject(json, "quoted_subscription");
+      if (__quotedSubscriptionJson != null) {
+        builder.quotedSubscription(QuotedSubscription.fromJson(__quotedSubscriptionJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse UpdateSubscriptionQuoteResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for UpdateSubscriptionQuoteResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for UpdateSubscriptionQuoteResponse. */
+  public static class Builder {
+
+    private Quote quote;
+
+    private QuotedSubscription quotedSubscription;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder quote(Quote quote) {
+      this.quote = quote;
+      return this;
+    }
+
+    public Builder quotedSubscription(QuotedSubscription quotedSubscription) {
+      this.quotedSubscription = quotedSubscription;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public UpdateSubscriptionQuoteResponse build() {
+      return new UpdateSubscriptionQuoteResponse(this);
+    }
+  }
+
+  /** Get the quote from the response. */
+  public Quote getQuote() {
+    return quote;
+  }
+
+  /** Get the quotedSubscription from the response. */
+  public QuotedSubscription getQuotedSubscription() {
+    return quotedSubscription;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/quoteLineGroup/QuoteLineGroup.java b/src/main/java/com/chargebee/v4/models/quoteLineGroup/QuoteLineGroup.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/quoteLineGroup/QuoteLineGroup.java
rename to src/main/java/com/chargebee/v4/models/quoteLineGroup/QuoteLineGroup.java
index a21ef95c..3848fde2 100644
--- a/src/main/java/com/chargebee/v4/core/models/quoteLineGroup/QuoteLineGroup.java
+++ b/src/main/java/com/chargebee/v4/models/quoteLineGroup/QuoteLineGroup.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.quoteLineGroup;
+package com.chargebee.v4.models.quoteLineGroup;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.math.BigDecimal;
@@ -712,6 +712,7 @@ public static class Discounts {
 
     private Long amount;
     private String description;
+    private String lineItemId;
     private EntityType entityType;
     private DiscountType discountType;
     private String entityId;
@@ -725,6 +726,10 @@ public String getDescription() {
       return description;
     }
 
+    public String getLineItemId() {
+      return lineItemId;
+    }
+
     public EntityType getEntityType() {
       return entityType;
     }
@@ -812,6 +817,8 @@ public static Discounts fromJson(String json) {
 
       obj.description = JsonUtil.getString(json, "description");
 
+      obj.lineItemId = JsonUtil.getString(json, "line_item_id");
+
       obj.entityType = EntityType.fromString(JsonUtil.getString(json, "entity_type"));
 
       obj.discountType = DiscountType.fromString(JsonUtil.getString(json, "discount_type"));
diff --git a/src/main/java/com/chargebee/v4/core/models/quotedCharge/QuotedCharge.java b/src/main/java/com/chargebee/v4/models/quotedCharge/QuotedCharge.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/quotedCharge/QuotedCharge.java
rename to src/main/java/com/chargebee/v4/models/quotedCharge/QuotedCharge.java
index bb53059b..c54254f8 100644
--- a/src/main/java/com/chargebee/v4/core/models/quotedCharge/QuotedCharge.java
+++ b/src/main/java/com/chargebee/v4/models/quotedCharge/QuotedCharge.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.quotedCharge;
+package com.chargebee.v4.models.quotedCharge;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.util.List;
diff --git a/src/main/java/com/chargebee/v4/models/quotedDeltaRamp/QuotedDeltaRamp.java b/src/main/java/com/chargebee/v4/models/quotedDeltaRamp/QuotedDeltaRamp.java
new file mode 100644
index 00000000..532d7c92
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/quotedDeltaRamp/QuotedDeltaRamp.java
@@ -0,0 +1,49 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.quotedDeltaRamp;
+
+import com.chargebee.v4.internal.JsonUtil;
+import java.util.List;
+
+public class QuotedDeltaRamp {
+
+  private List<LineItems> lineItems;
+
+  public List<LineItems> getLineItems() {
+    return lineItems;
+  }
+
+  public static QuotedDeltaRamp fromJson(String json) {
+    QuotedDeltaRamp obj = new QuotedDeltaRamp();
+
+    obj.lineItems =
+        JsonUtil.parseObjectArray(JsonUtil.getArray(json, "line_items")).stream()
+            .map(LineItems::fromJson)
+            .collect(java.util.stream.Collectors.toList());
+
+    return obj;
+  }
+
+  public static class LineItems {
+
+    private String itemLevelDiscountPerBillingCycleInDecimal;
+
+    public String getItemLevelDiscountPerBillingCycleInDecimal() {
+      return itemLevelDiscountPerBillingCycleInDecimal;
+    }
+
+    public static LineItems fromJson(String json) {
+      LineItems obj = new LineItems();
+
+      obj.itemLevelDiscountPerBillingCycleInDecimal =
+          JsonUtil.getString(json, "item_level_discount_per_billing_cycle_in_decimal");
+
+      return obj;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/quotedRamp/QuotedRamp.java b/src/main/java/com/chargebee/v4/models/quotedRamp/QuotedRamp.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/quotedRamp/QuotedRamp.java
rename to src/main/java/com/chargebee/v4/models/quotedRamp/QuotedRamp.java
index d630897c..5ea244f0 100644
--- a/src/main/java/com/chargebee/v4/core/models/quotedRamp/QuotedRamp.java
+++ b/src/main/java/com/chargebee/v4/models/quotedRamp/QuotedRamp.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.quotedRamp;
+package com.chargebee.v4.models.quotedRamp;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/quotedSubscription/QuotedSubscription.java b/src/main/java/com/chargebee/v4/models/quotedSubscription/QuotedSubscription.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/quotedSubscription/QuotedSubscription.java
rename to src/main/java/com/chargebee/v4/models/quotedSubscription/QuotedSubscription.java
index c267f347..0e2bdbb9 100644
--- a/src/main/java/com/chargebee/v4/core/models/quotedSubscription/QuotedSubscription.java
+++ b/src/main/java/com/chargebee/v4/models/quotedSubscription/QuotedSubscription.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.quotedSubscription;
+package com.chargebee.v4.models.quotedSubscription;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/ramp/Ramp.java b/src/main/java/com/chargebee/v4/models/ramp/Ramp.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/ramp/Ramp.java
rename to src/main/java/com/chargebee/v4/models/ramp/Ramp.java
index 5c66ab7f..9b292827 100644
--- a/src/main/java/com/chargebee/v4/core/models/ramp/Ramp.java
+++ b/src/main/java/com/chargebee/v4/models/ramp/Ramp.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.ramp;
+package com.chargebee.v4.models.ramp;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/ramp/params/RampCreateForSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/ramp/params/RampCreateForSubscriptionParams.java
new file mode 100644
index 00000000..ef40290a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/ramp/params/RampCreateForSubscriptionParams.java
@@ -0,0 +1,1597 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.ramp.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class RampCreateForSubscriptionParams {
+
+  private final Timestamp effectiveFrom;
+
+  private final String description;
+
+  private final List<String> couponsToRemove;
+
+  private final List<String> discountsToRemove;
+
+  private final List<String> itemsToRemove;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<ItemsToAddParams> itemsToAdd;
+
+  private final List<ItemsToUpdateParams> itemsToUpdate;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<CouponsToAddParams> couponsToAdd;
+
+  private final List<DiscountsToAddParams> discountsToAdd;
+
+  private RampCreateForSubscriptionParams(RampCreateForSubscriptionBuilder builder) {
+
+    this.effectiveFrom = builder.effectiveFrom;
+
+    this.description = builder.description;
+
+    this.couponsToRemove = builder.couponsToRemove;
+
+    this.discountsToRemove = builder.discountsToRemove;
+
+    this.itemsToRemove = builder.itemsToRemove;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.itemsToAdd = builder.itemsToAdd;
+
+    this.itemsToUpdate = builder.itemsToUpdate;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.couponsToAdd = builder.couponsToAdd;
+
+    this.discountsToAdd = builder.discountsToAdd;
+  }
+
+  public Timestamp getEffectiveFrom() {
+    return effectiveFrom;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public List<String> getCouponsToRemove() {
+    return couponsToRemove;
+  }
+
+  public List<String> getDiscountsToRemove() {
+    return discountsToRemove;
+  }
+
+  public List<String> getItemsToRemove() {
+    return itemsToRemove;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<ItemsToAddParams> getItemsToAdd() {
+    return itemsToAdd;
+  }
+
+  public List<ItemsToUpdateParams> getItemsToUpdate() {
+    return itemsToUpdate;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<CouponsToAddParams> getCouponsToAdd() {
+    return couponsToAdd;
+  }
+
+  public List<DiscountsToAddParams> getDiscountsToAdd() {
+    return discountsToAdd;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.effectiveFrom != null) {
+
+      formData.put("effective_from", this.effectiveFrom);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.couponsToRemove != null) {
+
+      formData.put("coupons_to_remove", this.couponsToRemove);
+    }
+
+    if (this.discountsToRemove != null) {
+
+      formData.put("discounts_to_remove", this.discountsToRemove);
+    }
+
+    if (this.itemsToRemove != null) {
+
+      formData.put("items_to_remove", this.itemsToRemove);
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemsToAdd != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemsToAdd.size(); i++) {
+        ItemsToAddParams item = this.itemsToAdd.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "items_to_add[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemsToUpdate != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemsToUpdate.size(); i++) {
+        ItemsToUpdateParams item = this.itemsToUpdate.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "items_to_update[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.couponsToAdd != null) {
+
+      // List of objects
+      for (int i = 0; i < this.couponsToAdd.size(); i++) {
+        CouponsToAddParams item = this.couponsToAdd.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons_to_add[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discountsToAdd != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discountsToAdd.size(); i++) {
+        DiscountsToAddParams item = this.discountsToAdd.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts_to_add[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for RampCreateForSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static RampCreateForSubscriptionBuilder builder() {
+    return new RampCreateForSubscriptionBuilder();
+  }
+
+  public static final class RampCreateForSubscriptionBuilder {
+
+    private Timestamp effectiveFrom;
+
+    private String description;
+
+    private List<String> couponsToRemove;
+
+    private List<String> discountsToRemove;
+
+    private List<String> itemsToRemove;
+
+    private ContractTermParams contractTerm;
+
+    private List<ItemsToAddParams> itemsToAdd;
+
+    private List<ItemsToUpdateParams> itemsToUpdate;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<CouponsToAddParams> couponsToAdd;
+
+    private List<DiscountsToAddParams> discountsToAdd;
+
+    private RampCreateForSubscriptionBuilder() {}
+
+    public RampCreateForSubscriptionBuilder effectiveFrom(Timestamp value) {
+      this.effectiveFrom = value;
+      return this;
+    }
+
+    public RampCreateForSubscriptionBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public RampCreateForSubscriptionBuilder couponsToRemove(List<String> value) {
+      this.couponsToRemove = value;
+      return this;
+    }
+
+    public RampCreateForSubscriptionBuilder discountsToRemove(List<String> value) {
+      this.discountsToRemove = value;
+      return this;
+    }
+
+    public RampCreateForSubscriptionBuilder itemsToRemove(List<String> value) {
+      this.itemsToRemove = value;
+      return this;
+    }
+
+    public RampCreateForSubscriptionBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public RampCreateForSubscriptionBuilder itemsToAdd(List<ItemsToAddParams> value) {
+      this.itemsToAdd = value;
+      return this;
+    }
+
+    public RampCreateForSubscriptionBuilder itemsToUpdate(List<ItemsToUpdateParams> value) {
+      this.itemsToUpdate = value;
+      return this;
+    }
+
+    public RampCreateForSubscriptionBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public RampCreateForSubscriptionBuilder couponsToAdd(List<CouponsToAddParams> value) {
+      this.couponsToAdd = value;
+      return this;
+    }
+
+    public RampCreateForSubscriptionBuilder discountsToAdd(List<DiscountsToAddParams> value) {
+      this.discountsToAdd = value;
+      return this;
+    }
+
+    public RampCreateForSubscriptionParams build() {
+      return new RampCreateForSubscriptionParams(this);
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private final Integer renewalBillingCycles;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+
+      this.renewalBillingCycles = builder.renewalBillingCycles;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    public Integer getRenewalBillingCycles() {
+      return renewalBillingCycles;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      if (this.renewalBillingCycles != null) {
+
+        formData.put("renewal_billing_cycles", this.renewalBillingCycles);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private Integer renewalBillingCycles;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermBuilder renewalBillingCycles(Integer value) {
+        this.renewalBillingCycles = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemsToAddParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private ItemsToAddParams(ItemsToAddBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOnOption = builder.chargeOnOption;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemsToAddParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemsToAddBuilder builder() {
+      return new ItemsToAddBuilder();
+    }
+
+    public static final class ItemsToAddBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOnOption chargeOnOption;
+
+      private ItemsToAddBuilder() {}
+
+      public ItemsToAddBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public ItemsToAddParams build() {
+        return new ItemsToAddParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemsToUpdateParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private ItemsToUpdateParams(ItemsToUpdateBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOnOption = builder.chargeOnOption;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemsToUpdateParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemsToUpdateBuilder builder() {
+      return new ItemsToUpdateBuilder();
+    }
+
+    public static final class ItemsToUpdateBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOnOption chargeOnOption;
+
+      private ItemsToUpdateBuilder() {}
+
+      public ItemsToUpdateBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public ItemsToUpdateParams build() {
+        return new ItemsToUpdateParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponsToAddParams {
+
+    private final String couponId;
+
+    private final Timestamp applyTill;
+
+    private CouponsToAddParams(CouponsToAddBuilder builder) {
+
+      this.couponId = builder.couponId;
+
+      this.applyTill = builder.applyTill;
+    }
+
+    public String getCouponId() {
+      return couponId;
+    }
+
+    public Timestamp getApplyTill() {
+      return applyTill;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.couponId != null) {
+
+        formData.put("coupon_id", this.couponId);
+      }
+
+      if (this.applyTill != null) {
+
+        formData.put("apply_till", this.applyTill);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsToAddParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsToAddBuilder builder() {
+      return new CouponsToAddBuilder();
+    }
+
+    public static final class CouponsToAddBuilder {
+
+      private String couponId;
+
+      private Timestamp applyTill;
+
+      private CouponsToAddBuilder() {}
+
+      public CouponsToAddBuilder couponId(String value) {
+        this.couponId = value;
+        return this;
+      }
+
+      public CouponsToAddBuilder applyTill(Timestamp value) {
+        this.applyTill = value;
+        return this;
+      }
+
+      public CouponsToAddParams build() {
+        return new CouponsToAddParams(this);
+      }
+    }
+  }
+
+  public static final class DiscountsToAddParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private DiscountsToAddParams(DiscountsToAddBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsToAddParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsToAddBuilder builder() {
+      return new DiscountsToAddBuilder();
+    }
+
+    public static final class DiscountsToAddBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private DiscountsToAddBuilder() {}
+
+      public DiscountsToAddBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsToAddParams build() {
+        return new DiscountsToAddParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/ramp/params/RampDeleteParams.java b/src/main/java/com/chargebee/v4/models/ramp/params/RampDeleteParams.java
new file mode 100644
index 00000000..eafdeab5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/ramp/params/RampDeleteParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.ramp.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class RampDeleteParams {
+
+  private RampDeleteParams(RampDeleteBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for RampDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static RampDeleteBuilder builder() {
+    return new RampDeleteBuilder();
+  }
+
+  public static final class RampDeleteBuilder {
+
+    private RampDeleteBuilder() {}
+
+    public RampDeleteParams build() {
+      return new RampDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/ramp/params/RampListParams.java b/src/main/java/com/chargebee/v4/models/ramp/params/RampListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/ramp/params/RampListParams.java
rename to src/main/java/com/chargebee/v4/models/ramp/params/RampListParams.java
index fe0df56d..f7b13c9d 100644
--- a/src/main/java/com/chargebee/v4/core/models/ramp/params/RampListParams.java
+++ b/src/main/java/com/chargebee/v4/models/ramp/params/RampListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.ramp.params;
+package com.chargebee.v4.models.ramp.params;
 
 import com.chargebee.v4.internal.Recommended;
 
@@ -92,13 +92,13 @@ public static final class StatusFilter {
         this.builder = builder;
       }
 
-      public RampListBuilder in(String... values) {
-        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
+      public RampListBuilder is(String value) {
+        builder.queryParams.put(fieldName + "[is]", value);
         return builder;
       }
 
-      public RampListBuilder is(String value) {
-        builder.queryParams.put(fieldName + "[is]", value);
+      public RampListBuilder in(String... values) {
+        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
         return builder;
       }
     }
@@ -112,13 +112,13 @@ public static final class SubscriptionIdFilter {
         this.builder = builder;
       }
 
-      public RampListBuilder in(String... values) {
-        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
+      public RampListBuilder is(String value) {
+        builder.queryParams.put(fieldName + "[is]", value);
         return builder;
       }
 
-      public RampListBuilder is(String value) {
-        builder.queryParams.put(fieldName + "[is]", value);
+      public RampListBuilder in(String... values) {
+        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
         return builder;
       }
     }
diff --git a/src/main/java/com/chargebee/v4/core/models/ramp/params/RampRetrieveParams.java b/src/main/java/com/chargebee/v4/models/ramp/params/RampRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/ramp/params/RampRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/ramp/params/RampRetrieveParams.java
index 0d47efc6..8db0235d 100644
--- a/src/main/java/com/chargebee/v4/core/models/ramp/params/RampRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/ramp/params/RampRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.ramp.params;
+package com.chargebee.v4.models.ramp.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/ramp/params/RampUpdateParams.java b/src/main/java/com/chargebee/v4/models/ramp/params/RampUpdateParams.java
new file mode 100644
index 00000000..66a70bbd
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/ramp/params/RampUpdateParams.java
@@ -0,0 +1,1597 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.ramp.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class RampUpdateParams {
+
+  private final Timestamp effectiveFrom;
+
+  private final String description;
+
+  private final List<String> couponsToRemove;
+
+  private final List<String> discountsToRemove;
+
+  private final List<String> itemsToRemove;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<ItemsToAddParams> itemsToAdd;
+
+  private final List<ItemsToUpdateParams> itemsToUpdate;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<CouponsToAddParams> couponsToAdd;
+
+  private final List<DiscountsToAddParams> discountsToAdd;
+
+  private RampUpdateParams(RampUpdateBuilder builder) {
+
+    this.effectiveFrom = builder.effectiveFrom;
+
+    this.description = builder.description;
+
+    this.couponsToRemove = builder.couponsToRemove;
+
+    this.discountsToRemove = builder.discountsToRemove;
+
+    this.itemsToRemove = builder.itemsToRemove;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.itemsToAdd = builder.itemsToAdd;
+
+    this.itemsToUpdate = builder.itemsToUpdate;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.couponsToAdd = builder.couponsToAdd;
+
+    this.discountsToAdd = builder.discountsToAdd;
+  }
+
+  public Timestamp getEffectiveFrom() {
+    return effectiveFrom;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public List<String> getCouponsToRemove() {
+    return couponsToRemove;
+  }
+
+  public List<String> getDiscountsToRemove() {
+    return discountsToRemove;
+  }
+
+  public List<String> getItemsToRemove() {
+    return itemsToRemove;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<ItemsToAddParams> getItemsToAdd() {
+    return itemsToAdd;
+  }
+
+  public List<ItemsToUpdateParams> getItemsToUpdate() {
+    return itemsToUpdate;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<CouponsToAddParams> getCouponsToAdd() {
+    return couponsToAdd;
+  }
+
+  public List<DiscountsToAddParams> getDiscountsToAdd() {
+    return discountsToAdd;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.effectiveFrom != null) {
+
+      formData.put("effective_from", this.effectiveFrom);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.couponsToRemove != null) {
+
+      formData.put("coupons_to_remove", this.couponsToRemove);
+    }
+
+    if (this.discountsToRemove != null) {
+
+      formData.put("discounts_to_remove", this.discountsToRemove);
+    }
+
+    if (this.itemsToRemove != null) {
+
+      formData.put("items_to_remove", this.itemsToRemove);
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.itemsToAdd != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemsToAdd.size(); i++) {
+        ItemsToAddParams item = this.itemsToAdd.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "items_to_add[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemsToUpdate != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemsToUpdate.size(); i++) {
+        ItemsToUpdateParams item = this.itemsToUpdate.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "items_to_update[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.couponsToAdd != null) {
+
+      // List of objects
+      for (int i = 0; i < this.couponsToAdd.size(); i++) {
+        CouponsToAddParams item = this.couponsToAdd.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons_to_add[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discountsToAdd != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discountsToAdd.size(); i++) {
+        DiscountsToAddParams item = this.discountsToAdd.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts_to_add[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for RampUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static RampUpdateBuilder builder() {
+    return new RampUpdateBuilder();
+  }
+
+  public static final class RampUpdateBuilder {
+
+    private Timestamp effectiveFrom;
+
+    private String description;
+
+    private List<String> couponsToRemove;
+
+    private List<String> discountsToRemove;
+
+    private List<String> itemsToRemove;
+
+    private ContractTermParams contractTerm;
+
+    private List<ItemsToAddParams> itemsToAdd;
+
+    private List<ItemsToUpdateParams> itemsToUpdate;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<CouponsToAddParams> couponsToAdd;
+
+    private List<DiscountsToAddParams> discountsToAdd;
+
+    private RampUpdateBuilder() {}
+
+    public RampUpdateBuilder effectiveFrom(Timestamp value) {
+      this.effectiveFrom = value;
+      return this;
+    }
+
+    public RampUpdateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public RampUpdateBuilder couponsToRemove(List<String> value) {
+      this.couponsToRemove = value;
+      return this;
+    }
+
+    public RampUpdateBuilder discountsToRemove(List<String> value) {
+      this.discountsToRemove = value;
+      return this;
+    }
+
+    public RampUpdateBuilder itemsToRemove(List<String> value) {
+      this.itemsToRemove = value;
+      return this;
+    }
+
+    public RampUpdateBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public RampUpdateBuilder itemsToAdd(List<ItemsToAddParams> value) {
+      this.itemsToAdd = value;
+      return this;
+    }
+
+    public RampUpdateBuilder itemsToUpdate(List<ItemsToUpdateParams> value) {
+      this.itemsToUpdate = value;
+      return this;
+    }
+
+    public RampUpdateBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public RampUpdateBuilder couponsToAdd(List<CouponsToAddParams> value) {
+      this.couponsToAdd = value;
+      return this;
+    }
+
+    public RampUpdateBuilder discountsToAdd(List<DiscountsToAddParams> value) {
+      this.discountsToAdd = value;
+      return this;
+    }
+
+    public RampUpdateParams build() {
+      return new RampUpdateParams(this);
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private final Integer renewalBillingCycles;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+
+      this.renewalBillingCycles = builder.renewalBillingCycles;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    public Integer getRenewalBillingCycles() {
+      return renewalBillingCycles;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      if (this.renewalBillingCycles != null) {
+
+        formData.put("renewal_billing_cycles", this.renewalBillingCycles);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private Integer renewalBillingCycles;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermBuilder renewalBillingCycles(Integer value) {
+        this.renewalBillingCycles = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemsToAddParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private ItemsToAddParams(ItemsToAddBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOnOption = builder.chargeOnOption;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemsToAddParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemsToAddBuilder builder() {
+      return new ItemsToAddBuilder();
+    }
+
+    public static final class ItemsToAddBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOnOption chargeOnOption;
+
+      private ItemsToAddBuilder() {}
+
+      public ItemsToAddBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public ItemsToAddBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public ItemsToAddParams build() {
+        return new ItemsToAddParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemsToUpdateParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private ItemsToUpdateParams(ItemsToUpdateBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOnOption = builder.chargeOnOption;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemsToUpdateParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemsToUpdateBuilder builder() {
+      return new ItemsToUpdateBuilder();
+    }
+
+    public static final class ItemsToUpdateBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOnOption chargeOnOption;
+
+      private ItemsToUpdateBuilder() {}
+
+      public ItemsToUpdateBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public ItemsToUpdateBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public ItemsToUpdateParams build() {
+        return new ItemsToUpdateParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponsToAddParams {
+
+    private final String couponId;
+
+    private final Timestamp applyTill;
+
+    private CouponsToAddParams(CouponsToAddBuilder builder) {
+
+      this.couponId = builder.couponId;
+
+      this.applyTill = builder.applyTill;
+    }
+
+    public String getCouponId() {
+      return couponId;
+    }
+
+    public Timestamp getApplyTill() {
+      return applyTill;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.couponId != null) {
+
+        formData.put("coupon_id", this.couponId);
+      }
+
+      if (this.applyTill != null) {
+
+        formData.put("apply_till", this.applyTill);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsToAddParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsToAddBuilder builder() {
+      return new CouponsToAddBuilder();
+    }
+
+    public static final class CouponsToAddBuilder {
+
+      private String couponId;
+
+      private Timestamp applyTill;
+
+      private CouponsToAddBuilder() {}
+
+      public CouponsToAddBuilder couponId(String value) {
+        this.couponId = value;
+        return this;
+      }
+
+      public CouponsToAddBuilder applyTill(Timestamp value) {
+        this.applyTill = value;
+        return this;
+      }
+
+      public CouponsToAddParams build() {
+        return new CouponsToAddParams(this);
+      }
+    }
+  }
+
+  public static final class DiscountsToAddParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private DiscountsToAddParams(DiscountsToAddBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsToAddParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsToAddBuilder builder() {
+      return new DiscountsToAddBuilder();
+    }
+
+    public static final class DiscountsToAddBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private DiscountsToAddBuilder() {}
+
+      public DiscountsToAddBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsToAddBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsToAddParams build() {
+        return new DiscountsToAddParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/ramp/RampCreateForSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/ramp/responses/RampCreateForSubscriptionResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/ramp/RampCreateForSubscriptionResponse.java
rename to src/main/java/com/chargebee/v4/models/ramp/responses/RampCreateForSubscriptionResponse.java
index f1f6d785..19449e7a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/ramp/RampCreateForSubscriptionResponse.java
+++ b/src/main/java/com/chargebee/v4/models/ramp/responses/RampCreateForSubscriptionResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.ramp;
+package com.chargebee.v4.models.ramp.responses;
 
-import com.chargebee.v4.core.models.ramp.Ramp;
+import com.chargebee.v4.models.ramp.Ramp;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/ramp/RampDeleteResponse.java b/src/main/java/com/chargebee/v4/models/ramp/responses/RampDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/ramp/RampDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/ramp/responses/RampDeleteResponse.java
index a02ed0b6..c12d8a61 100644
--- a/src/main/java/com/chargebee/v4/core/responses/ramp/RampDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/ramp/responses/RampDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.ramp;
+package com.chargebee.v4.models.ramp.responses;
 
-import com.chargebee.v4.core.models.ramp.Ramp;
+import com.chargebee.v4.models.ramp.Ramp;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/ramp/RampListResponse.java b/src/main/java/com/chargebee/v4/models/ramp/responses/RampListResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/ramp/RampListResponse.java
rename to src/main/java/com/chargebee/v4/models/ramp/responses/RampListResponse.java
index a88e3cf3..aab359cb 100644
--- a/src/main/java/com/chargebee/v4/core/responses/ramp/RampListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/ramp/responses/RampListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.ramp;
+package com.chargebee.v4.models.ramp.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.ramp.Ramp;
+import com.chargebee.v4.models.ramp.Ramp;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.RampService;
-import com.chargebee.v4.core.models.ramp.params.RampListParams;
+import com.chargebee.v4.services.RampService;
+import com.chargebee.v4.models.ramp.params.RampListParams;
 
 /** Immutable response object for RampList operation. Contains paginated list data. */
 public final class RampListResponse {
@@ -95,9 +96,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public RampListResponse nextPage() throws Exception {
+  public RampListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/ramp/responses/RampRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/ramp/responses/RampRetrieveResponse.java
new file mode 100644
index 00000000..8c5294ae
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/ramp/responses/RampRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.ramp.responses;
+
+import com.chargebee.v4.models.ramp.Ramp;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for RampRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class RampRetrieveResponse extends BaseResponse {
+  private final Ramp ramp;
+
+  private RampRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.ramp = builder.ramp;
+  }
+
+  /** Parse JSON response into RampRetrieveResponse object. */
+  public static RampRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into RampRetrieveResponse object with HTTP response. */
+  public static RampRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __rampJson = JsonUtil.getObject(json, "ramp");
+      if (__rampJson != null) {
+        builder.ramp(Ramp.fromJson(__rampJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse RampRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for RampRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for RampRetrieveResponse. */
+  public static class Builder {
+
+    private Ramp ramp;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder ramp(Ramp ramp) {
+      this.ramp = ramp;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public RampRetrieveResponse build() {
+      return new RampRetrieveResponse(this);
+    }
+  }
+
+  /** Get the ramp from the response. */
+  public Ramp getRamp() {
+    return ramp;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/ramp/RampUpdateResponse.java b/src/main/java/com/chargebee/v4/models/ramp/responses/RampUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/ramp/RampUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/ramp/responses/RampUpdateResponse.java
index e8766c76..f7cbef23 100644
--- a/src/main/java/com/chargebee/v4/core/responses/ramp/RampUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/ramp/responses/RampUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.ramp;
+package com.chargebee.v4.models.ramp.responses;
 
-import com.chargebee.v4.core.models.ramp.Ramp;
+import com.chargebee.v4.models.ramp.Ramp;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/recordedPurchase/RecordedPurchase.java b/src/main/java/com/chargebee/v4/models/recordedPurchase/RecordedPurchase.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/recordedPurchase/RecordedPurchase.java
rename to src/main/java/com/chargebee/v4/models/recordedPurchase/RecordedPurchase.java
index 044f95d9..2ee63421 100644
--- a/src/main/java/com/chargebee/v4/core/models/recordedPurchase/RecordedPurchase.java
+++ b/src/main/java/com/chargebee/v4/models/recordedPurchase/RecordedPurchase.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.recordedPurchase;
+package com.chargebee.v4.models.recordedPurchase;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/recordedPurchase/params/RecordedPurchaseCreateParams.java b/src/main/java/com/chargebee/v4/models/recordedPurchase/params/RecordedPurchaseCreateParams.java
new file mode 100644
index 00000000..ead1eb3c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/recordedPurchase/params/RecordedPurchaseCreateParams.java
@@ -0,0 +1,433 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.recordedPurchase.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class RecordedPurchaseCreateParams {
+
+  private final String appId;
+
+  private final CustomerParams customer;
+
+  private final AppleAppStoreParams appleAppStore;
+
+  private final GooglePlayStoreParams googlePlayStore;
+
+  private final OmnichannelSubscriptionParams omnichannelSubscription;
+
+  private RecordedPurchaseCreateParams(RecordedPurchaseCreateBuilder builder) {
+
+    this.appId = builder.appId;
+
+    this.customer = builder.customer;
+
+    this.appleAppStore = builder.appleAppStore;
+
+    this.googlePlayStore = builder.googlePlayStore;
+
+    this.omnichannelSubscription = builder.omnichannelSubscription;
+  }
+
+  public String getAppId() {
+    return appId;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public AppleAppStoreParams getAppleAppStore() {
+    return appleAppStore;
+  }
+
+  public GooglePlayStoreParams getGooglePlayStore() {
+    return googlePlayStore;
+  }
+
+  public OmnichannelSubscriptionParams getOmnichannelSubscription() {
+    return omnichannelSubscription;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.appId != null) {
+
+      formData.put("app_id", this.appId);
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.appleAppStore != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.appleAppStore.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "apple_app_store[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.googlePlayStore != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.googlePlayStore.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "google_play_store[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.omnichannelSubscription != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.omnichannelSubscription.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "omnichannel_subscription[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for RecordedPurchaseCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static RecordedPurchaseCreateBuilder builder() {
+    return new RecordedPurchaseCreateBuilder();
+  }
+
+  public static final class RecordedPurchaseCreateBuilder {
+
+    private String appId;
+
+    private CustomerParams customer;
+
+    private AppleAppStoreParams appleAppStore;
+
+    private GooglePlayStoreParams googlePlayStore;
+
+    private OmnichannelSubscriptionParams omnichannelSubscription;
+
+    private RecordedPurchaseCreateBuilder() {}
+
+    public RecordedPurchaseCreateBuilder appId(String value) {
+      this.appId = value;
+      return this;
+    }
+
+    public RecordedPurchaseCreateBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public RecordedPurchaseCreateBuilder appleAppStore(AppleAppStoreParams value) {
+      this.appleAppStore = value;
+      return this;
+    }
+
+    public RecordedPurchaseCreateBuilder googlePlayStore(GooglePlayStoreParams value) {
+      this.googlePlayStore = value;
+      return this;
+    }
+
+    public RecordedPurchaseCreateBuilder omnichannelSubscription(
+        OmnichannelSubscriptionParams value) {
+      this.omnichannelSubscription = value;
+      return this;
+    }
+
+    public RecordedPurchaseCreateParams build() {
+      return new RecordedPurchaseCreateParams(this);
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+  }
+
+  public static final class AppleAppStoreParams {
+
+    private final String transactionId;
+
+    private final String receipt;
+
+    private final String productId;
+
+    private AppleAppStoreParams(AppleAppStoreBuilder builder) {
+
+      this.transactionId = builder.transactionId;
+
+      this.receipt = builder.receipt;
+
+      this.productId = builder.productId;
+    }
+
+    public String getTransactionId() {
+      return transactionId;
+    }
+
+    public String getReceipt() {
+      return receipt;
+    }
+
+    public String getProductId() {
+      return productId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.transactionId != null) {
+
+        formData.put("transaction_id", this.transactionId);
+      }
+
+      if (this.receipt != null) {
+
+        formData.put("receipt", this.receipt);
+      }
+
+      if (this.productId != null) {
+
+        formData.put("product_id", this.productId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AppleAppStoreParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AppleAppStoreBuilder builder() {
+      return new AppleAppStoreBuilder();
+    }
+
+    public static final class AppleAppStoreBuilder {
+
+      private String transactionId;
+
+      private String receipt;
+
+      private String productId;
+
+      private AppleAppStoreBuilder() {}
+
+      public AppleAppStoreBuilder transactionId(String value) {
+        this.transactionId = value;
+        return this;
+      }
+
+      public AppleAppStoreBuilder receipt(String value) {
+        this.receipt = value;
+        return this;
+      }
+
+      public AppleAppStoreBuilder productId(String value) {
+        this.productId = value;
+        return this;
+      }
+
+      public AppleAppStoreParams build() {
+        return new AppleAppStoreParams(this);
+      }
+    }
+  }
+
+  public static final class GooglePlayStoreParams {
+
+    private final String purchaseToken;
+
+    private final String productId;
+
+    private final String orderId;
+
+    private GooglePlayStoreParams(GooglePlayStoreBuilder builder) {
+
+      this.purchaseToken = builder.purchaseToken;
+
+      this.productId = builder.productId;
+
+      this.orderId = builder.orderId;
+    }
+
+    public String getPurchaseToken() {
+      return purchaseToken;
+    }
+
+    public String getProductId() {
+      return productId;
+    }
+
+    public String getOrderId() {
+      return orderId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.purchaseToken != null) {
+
+        formData.put("purchase_token", this.purchaseToken);
+      }
+
+      if (this.productId != null) {
+
+        formData.put("product_id", this.productId);
+      }
+
+      if (this.orderId != null) {
+
+        formData.put("order_id", this.orderId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for GooglePlayStoreParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static GooglePlayStoreBuilder builder() {
+      return new GooglePlayStoreBuilder();
+    }
+
+    public static final class GooglePlayStoreBuilder {
+
+      private String purchaseToken;
+
+      private String productId;
+
+      private String orderId;
+
+      private GooglePlayStoreBuilder() {}
+
+      public GooglePlayStoreBuilder purchaseToken(String value) {
+        this.purchaseToken = value;
+        return this;
+      }
+
+      public GooglePlayStoreBuilder productId(String value) {
+        this.productId = value;
+        return this;
+      }
+
+      public GooglePlayStoreBuilder orderId(String value) {
+        this.orderId = value;
+        return this;
+      }
+
+      public GooglePlayStoreParams build() {
+        return new GooglePlayStoreParams(this);
+      }
+    }
+  }
+
+  public static final class OmnichannelSubscriptionParams {
+
+    private final String id;
+
+    private OmnichannelSubscriptionParams(OmnichannelSubscriptionBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for OmnichannelSubscriptionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static OmnichannelSubscriptionBuilder builder() {
+      return new OmnichannelSubscriptionBuilder();
+    }
+
+    public static final class OmnichannelSubscriptionBuilder {
+
+      private String id;
+
+      private OmnichannelSubscriptionBuilder() {}
+
+      public OmnichannelSubscriptionBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public OmnichannelSubscriptionParams build() {
+        return new OmnichannelSubscriptionParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/recordedPurchase/params/RecordedPurchaseRetrieveParams.java b/src/main/java/com/chargebee/v4/models/recordedPurchase/params/RecordedPurchaseRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/recordedPurchase/params/RecordedPurchaseRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/recordedPurchase/params/RecordedPurchaseRetrieveParams.java
index 718b7ba6..a73e00aa 100644
--- a/src/main/java/com/chargebee/v4/core/models/recordedPurchase/params/RecordedPurchaseRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/recordedPurchase/params/RecordedPurchaseRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.recordedPurchase.params;
+package com.chargebee.v4.models.recordedPurchase.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/recordedPurchase/RecordedPurchaseCreateResponse.java b/src/main/java/com/chargebee/v4/models/recordedPurchase/responses/RecordedPurchaseCreateResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/recordedPurchase/RecordedPurchaseCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/recordedPurchase/responses/RecordedPurchaseCreateResponse.java
index bd2ed972..26712894 100644
--- a/src/main/java/com/chargebee/v4/core/responses/recordedPurchase/RecordedPurchaseCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/recordedPurchase/responses/RecordedPurchaseCreateResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.recordedPurchase;
+package com.chargebee.v4.models.recordedPurchase.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.recordedPurchase.RecordedPurchase;
+import com.chargebee.v4.models.recordedPurchase.RecordedPurchase;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/recordedPurchase/responses/RecordedPurchaseRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/recordedPurchase/responses/RecordedPurchaseRetrieveResponse.java
new file mode 100644
index 00000000..121fc2a8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/recordedPurchase/responses/RecordedPurchaseRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.recordedPurchase.responses;
+
+import com.chargebee.v4.models.recordedPurchase.RecordedPurchase;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for RecordedPurchaseRetrieve operation. Contains the response data from
+ * a single resource get operation.
+ */
+public final class RecordedPurchaseRetrieveResponse extends BaseResponse {
+  private final RecordedPurchase recordedPurchase;
+
+  private RecordedPurchaseRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.recordedPurchase = builder.recordedPurchase;
+  }
+
+  /** Parse JSON response into RecordedPurchaseRetrieveResponse object. */
+  public static RecordedPurchaseRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into RecordedPurchaseRetrieveResponse object with HTTP response. */
+  public static RecordedPurchaseRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __recordedPurchaseJson = JsonUtil.getObject(json, "recorded_purchase");
+      if (__recordedPurchaseJson != null) {
+        builder.recordedPurchase(RecordedPurchase.fromJson(__recordedPurchaseJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse RecordedPurchaseRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for RecordedPurchaseRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for RecordedPurchaseRetrieveResponse. */
+  public static class Builder {
+
+    private RecordedPurchase recordedPurchase;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder recordedPurchase(RecordedPurchase recordedPurchase) {
+      this.recordedPurchase = recordedPurchase;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public RecordedPurchaseRetrieveResponse build() {
+      return new RecordedPurchaseRetrieveResponse(this);
+    }
+  }
+
+  /** Get the recordedPurchase from the response. */
+  public RecordedPurchase getRecordedPurchase() {
+    return recordedPurchase;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/resourceMigration/ResourceMigration.java b/src/main/java/com/chargebee/v4/models/resourceMigration/ResourceMigration.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/resourceMigration/ResourceMigration.java
rename to src/main/java/com/chargebee/v4/models/resourceMigration/ResourceMigration.java
index 128b7321..86fc71c1 100644
--- a/src/main/java/com/chargebee/v4/core/models/resourceMigration/ResourceMigration.java
+++ b/src/main/java/com/chargebee/v4/models/resourceMigration/ResourceMigration.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.resourceMigration;
+package com.chargebee.v4.models.resourceMigration;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/resourceMigration/params/ResourceMigrationRetrieveLatestParams.java b/src/main/java/com/chargebee/v4/models/resourceMigration/params/ResourceMigrationRetrieveLatestParams.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/resourceMigration/params/ResourceMigrationRetrieveLatestParams.java
rename to src/main/java/com/chargebee/v4/models/resourceMigration/params/ResourceMigrationRetrieveLatestParams.java
index e1e9fefe..4b3d0b50 100644
--- a/src/main/java/com/chargebee/v4/core/models/resourceMigration/params/ResourceMigrationRetrieveLatestParams.java
+++ b/src/main/java/com/chargebee/v4/models/resourceMigration/params/ResourceMigrationRetrieveLatestParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.resourceMigration.params;
+package com.chargebee.v4.models.resourceMigration.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/resourceMigration/responses/ResourceMigrationRetrieveLatestResponse.java b/src/main/java/com/chargebee/v4/models/resourceMigration/responses/ResourceMigrationRetrieveLatestResponse.java
new file mode 100644
index 00000000..72af2bc9
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/resourceMigration/responses/ResourceMigrationRetrieveLatestResponse.java
@@ -0,0 +1,79 @@
+package com.chargebee.v4.models.resourceMigration.responses;
+
+import com.chargebee.v4.models.resourceMigration.ResourceMigration;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ResourceMigrationRetrieveLatest operation. Contains the response
+ * data from a single resource get operation.
+ */
+public final class ResourceMigrationRetrieveLatestResponse extends BaseResponse {
+  private final ResourceMigration resourceMigration;
+
+  private ResourceMigrationRetrieveLatestResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.resourceMigration = builder.resourceMigration;
+  }
+
+  /** Parse JSON response into ResourceMigrationRetrieveLatestResponse object. */
+  public static ResourceMigrationRetrieveLatestResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ResourceMigrationRetrieveLatestResponse object with HTTP response. */
+  public static ResourceMigrationRetrieveLatestResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __resourceMigrationJson = JsonUtil.getObject(json, "resource_migration");
+      if (__resourceMigrationJson != null) {
+        builder.resourceMigration(ResourceMigration.fromJson(__resourceMigrationJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse ResourceMigrationRetrieveLatestResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ResourceMigrationRetrieveLatestResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ResourceMigrationRetrieveLatestResponse. */
+  public static class Builder {
+
+    private ResourceMigration resourceMigration;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder resourceMigration(ResourceMigration resourceMigration) {
+      this.resourceMigration = resourceMigration;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ResourceMigrationRetrieveLatestResponse build() {
+      return new ResourceMigrationRetrieveLatestResponse(this);
+    }
+  }
+
+  /** Get the resourceMigration from the response. */
+  public ResourceMigration getResourceMigration() {
+    return resourceMigration;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/rule/Rule.java b/src/main/java/com/chargebee/v4/models/rule/Rule.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/rule/Rule.java
rename to src/main/java/com/chargebee/v4/models/rule/Rule.java
index a2965fae..a9478e78 100644
--- a/src/main/java/com/chargebee/v4/core/models/rule/Rule.java
+++ b/src/main/java/com/chargebee/v4/models/rule/Rule.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.rule;
+package com.chargebee.v4.models.rule;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/rule/params/RuleRetrieveParams.java b/src/main/java/com/chargebee/v4/models/rule/params/RuleRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/rule/params/RuleRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/rule/params/RuleRetrieveParams.java
index 34f2f10c..00ac79ce 100644
--- a/src/main/java/com/chargebee/v4/core/models/rule/params/RuleRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/rule/params/RuleRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.rule.params;
+package com.chargebee.v4.models.rule.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/rule/responses/RuleRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/rule/responses/RuleRetrieveResponse.java
new file mode 100644
index 00000000..bb05dd79
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/rule/responses/RuleRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.rule.responses;
+
+import com.chargebee.v4.models.rule.Rule;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for RuleRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class RuleRetrieveResponse extends BaseResponse {
+  private final Rule rule;
+
+  private RuleRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.rule = builder.rule;
+  }
+
+  /** Parse JSON response into RuleRetrieveResponse object. */
+  public static RuleRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into RuleRetrieveResponse object with HTTP response. */
+  public static RuleRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __ruleJson = JsonUtil.getObject(json, "rule");
+      if (__ruleJson != null) {
+        builder.rule(Rule.fromJson(__ruleJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse RuleRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for RuleRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for RuleRetrieveResponse. */
+  public static class Builder {
+
+    private Rule rule;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder rule(Rule rule) {
+      this.rule = rule;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public RuleRetrieveResponse build() {
+      return new RuleRetrieveResponse(this);
+    }
+  }
+
+  /** Get the rule from the response. */
+  public Rule getRule() {
+    return rule;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/salesOrder/SalesOrder.java b/src/main/java/com/chargebee/v4/models/salesOrder/SalesOrder.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/models/salesOrder/SalesOrder.java
rename to src/main/java/com/chargebee/v4/models/salesOrder/SalesOrder.java
index 7d60bc3f..3fe79973 100644
--- a/src/main/java/com/chargebee/v4/core/models/salesOrder/SalesOrder.java
+++ b/src/main/java/com/chargebee/v4/models/salesOrder/SalesOrder.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.salesOrder;
+package com.chargebee.v4.models.salesOrder;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -29,6 +29,10 @@ public class SalesOrder {
   private String currencyCode;
   private List<String> subscriptionIds;
   private Status status;
+  @Deprecated private List<String> invoiceIds;
+  @Deprecated private List<String> creditNoteIds;
+  @Deprecated private List<String> unbilledChargeIds;
+  private Boolean deleted;
   private List<LineItems> lineItems;
   private List<BillingAddresses> billingAddresses;
   private List<Discounts> discounts;
@@ -37,6 +41,7 @@ public class SalesOrder {
   private PaymentConfiguration paymentConfiguration;
   private BillingConfiguration billingConfiguration;
   private RenewalTerm renewalTerm;
+  private List<CreditLines> creditLines;
 
   public String getId() {
     return id;
@@ -102,6 +107,25 @@ public Status getStatus() {
     return status;
   }
 
+  @Deprecated
+  public List<String> getInvoiceIds() {
+    return invoiceIds;
+  }
+
+  @Deprecated
+  public List<String> getCreditNoteIds() {
+    return creditNoteIds;
+  }
+
+  @Deprecated
+  public List<String> getUnbilledChargeIds() {
+    return unbilledChargeIds;
+  }
+
+  public Boolean getDeleted() {
+    return deleted;
+  }
+
   public List<LineItems> getLineItems() {
     return lineItems;
   }
@@ -134,6 +158,10 @@ public RenewalTerm getRenewalTerm() {
     return renewalTerm;
   }
 
+  public List<CreditLines> getCreditLines() {
+    return creditLines;
+  }
+
   public enum Status {
     ACTIVE("active"),
 
@@ -197,6 +225,15 @@ public static SalesOrder fromJson(String json) {
 
     obj.status = Status.fromString(JsonUtil.getString(json, "status"));
 
+    obj.invoiceIds = JsonUtil.parseArrayOfString(JsonUtil.getArray(json, "invoice_ids"));
+
+    obj.creditNoteIds = JsonUtil.parseArrayOfString(JsonUtil.getArray(json, "credit_note_ids"));
+
+    obj.unbilledChargeIds =
+        JsonUtil.parseArrayOfString(JsonUtil.getArray(json, "unbilled_charge_ids"));
+
+    obj.deleted = JsonUtil.getBoolean(json, "deleted");
+
     obj.lineItems =
         JsonUtil.parseObjectArray(JsonUtil.getArray(json, "line_items")).stream()
             .map(LineItems::fromJson)
@@ -237,6 +274,11 @@ public static SalesOrder fromJson(String json) {
       obj.renewalTerm = RenewalTerm.fromJson(__renewalTermJson);
     }
 
+    obj.creditLines =
+        JsonUtil.parseObjectArray(JsonUtil.getArray(json, "credit_lines")).stream()
+            .map(CreditLines::fromJson)
+            .collect(java.util.stream.Collectors.toList());
+
     return obj;
   }
 
@@ -248,6 +290,9 @@ public static class LineItems {
     private String name;
     private String quantity;
     private String unitPrice;
+    private String billableUnitPrice;
+    private String billableQuantity;
+    private String billableAmount;
     private Integer billingPeriod;
     private BillingPeriodUnit billingPeriodUnit;
     private Integer servicePeriodDays;
@@ -283,6 +328,18 @@ public String getUnitPrice() {
       return unitPrice;
     }
 
+    public String getBillableUnitPrice() {
+      return billableUnitPrice;
+    }
+
+    public String getBillableQuantity() {
+      return billableQuantity;
+    }
+
+    public String getBillableAmount() {
+      return billableAmount;
+    }
+
     public Integer getBillingPeriod() {
       return billingPeriod;
     }
@@ -436,6 +493,12 @@ public static LineItems fromJson(String json) {
 
       obj.unitPrice = JsonUtil.getString(json, "unit_price");
 
+      obj.billableUnitPrice = JsonUtil.getString(json, "billable_unit_price");
+
+      obj.billableQuantity = JsonUtil.getString(json, "billable_quantity");
+
+      obj.billableAmount = JsonUtil.getString(json, "billable_amount");
+
       obj.billingPeriod = JsonUtil.getInteger(json, "billing_period");
 
       obj.billingPeriodUnit =
@@ -1323,4 +1386,35 @@ public static RenewalTerm fromJson(String json) {
       return obj;
     }
   }
+
+  public static class CreditLines {
+
+    private String amount;
+    private String unitPrice;
+    private String lineItemAssociationId;
+
+    public String getAmount() {
+      return amount;
+    }
+
+    public String getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getLineItemAssociationId() {
+      return lineItemAssociationId;
+    }
+
+    public static CreditLines fromJson(String json) {
+      CreditLines obj = new CreditLines();
+
+      obj.amount = JsonUtil.getString(json, "amount");
+
+      obj.unitPrice = JsonUtil.getString(json, "unit_price");
+
+      obj.lineItemAssociationId = JsonUtil.getString(json, "line_item_association_id");
+
+      return obj;
+    }
+  }
 }
diff --git a/src/main/java/com/chargebee/v4/core/models/siteMigrationDetail/SiteMigrationDetail.java b/src/main/java/com/chargebee/v4/models/siteMigrationDetail/SiteMigrationDetail.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/siteMigrationDetail/SiteMigrationDetail.java
rename to src/main/java/com/chargebee/v4/models/siteMigrationDetail/SiteMigrationDetail.java
index 077c7229..7477191f 100644
--- a/src/main/java/com/chargebee/v4/core/models/siteMigrationDetail/SiteMigrationDetail.java
+++ b/src/main/java/com/chargebee/v4/models/siteMigrationDetail/SiteMigrationDetail.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.siteMigrationDetail;
+package com.chargebee.v4.models.siteMigrationDetail;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/siteMigrationDetail/params/SiteMigrationDetailListParams.java b/src/main/java/com/chargebee/v4/models/siteMigrationDetail/params/SiteMigrationDetailListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/siteMigrationDetail/params/SiteMigrationDetailListParams.java
rename to src/main/java/com/chargebee/v4/models/siteMigrationDetail/params/SiteMigrationDetailListParams.java
index c89b827f..47fdfc9a 100644
--- a/src/main/java/com/chargebee/v4/core/models/siteMigrationDetail/params/SiteMigrationDetailListParams.java
+++ b/src/main/java/com/chargebee/v4/models/siteMigrationDetail/params/SiteMigrationDetailListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.siteMigrationDetail.params;
+package com.chargebee.v4.models.siteMigrationDetail.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/siteMigrationDetail/SiteMigrationDetailListResponse.java b/src/main/java/com/chargebee/v4/models/siteMigrationDetail/responses/SiteMigrationDetailListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/siteMigrationDetail/SiteMigrationDetailListResponse.java
rename to src/main/java/com/chargebee/v4/models/siteMigrationDetail/responses/SiteMigrationDetailListResponse.java
index dfd5f825..6c91e188 100644
--- a/src/main/java/com/chargebee/v4/core/responses/siteMigrationDetail/SiteMigrationDetailListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/siteMigrationDetail/responses/SiteMigrationDetailListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.siteMigrationDetail;
+package com.chargebee.v4.models.siteMigrationDetail.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.siteMigrationDetail.SiteMigrationDetail;
+import com.chargebee.v4.models.siteMigrationDetail.SiteMigrationDetail;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.SiteMigrationDetailService;
-import com.chargebee.v4.core.models.siteMigrationDetail.params.SiteMigrationDetailListParams;
+import com.chargebee.v4.services.SiteMigrationDetailService;
+import com.chargebee.v4.models.siteMigrationDetail.params.SiteMigrationDetailListParams;
 
 /**
  * Immutable response object for SiteMigrationDetailList operation. Contains paginated list data.
@@ -101,9 +102,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public SiteMigrationDetailListResponse nextPage() throws Exception {
+  public SiteMigrationDetailListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/Subscription.java b/src/main/java/com/chargebee/v4/models/subscription/Subscription.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/subscription/Subscription.java
rename to src/main/java/com/chargebee/v4/models/subscription/Subscription.java
index 2e7e3722..cf34ce75 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscription/Subscription.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/Subscription.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscription;
+package com.chargebee.v4.models.subscription;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.math.BigDecimal;
@@ -93,7 +93,7 @@ public class Subscription {
   private List<EventBasedAddons> eventBasedAddons;
   private String planId;
 
-  private java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+  private java.util.Map<String, String> customFields = new java.util.HashMap<>();
 
   public String getId() {
     return id;
@@ -415,7 +415,7 @@ public String getPlanId() {
    *
    * @return map containing all custom fields
    */
-  public java.util.Map<String, Object> getCustomFields() {
+  public java.util.Map<String, String> getCustomFields() {
     return customFields;
   }
 
@@ -425,7 +425,7 @@ public java.util.Map<String, Object> getCustomFields() {
    * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
    * @return the value of the custom field, or null if not present
    */
-  public Object getCustomField(String fieldName) {
+  public String getCustomField(String fieldName) {
     return customFields.get(fieldName);
   }
 
@@ -714,7 +714,7 @@ public static AutoCollection fromString(String value) {
   public static Subscription fromJson(String json) {
     Subscription obj = new Subscription();
 
-    // Parse JSON to extract all keys
+    // Parse JSON to extract all keys for custom field extraction
     java.util.Set<String> knownFields = new java.util.HashSet<>();
 
     knownFields.add("id");
@@ -1086,9 +1086,9 @@ public static Subscription fromJson(String json) {
    * @param knownFields set of known field names
    * @return map of custom fields
    */
-  private static java.util.Map<String, Object> extractCustomFields(
+  private static java.util.Map<String, String> extractCustomFields(
       String json, java.util.Set<String> knownFields) {
-    java.util.Map<String, Object> customFields = new java.util.HashMap<>();
+    java.util.Map<String, String> customFields = new java.util.HashMap<>();
     try {
       // Parse the entire JSON as a map
       java.util.Map<String, Object> allFields = JsonUtil.parseJsonObjectToMap(json);
@@ -1097,7 +1097,8 @@ private static java.util.Map<String, Object> extractCustomFields(
           String key = entry.getKey();
           // Include fields that start with "cf_" and are not in knownFields
           if (key != null && key.startsWith("cf_") && !knownFields.contains(key)) {
-            customFields.put(key, entry.getValue());
+            customFields.put(
+                key, entry.getValue() != null ? String.valueOf(entry.getValue()) : null);
           }
         }
       }
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/ContractTermsForSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/ContractTermsForSubscriptionParams.java
new file mode 100644
index 00000000..c6f6b854
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/ContractTermsForSubscriptionParams.java
@@ -0,0 +1,153 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ContractTermsForSubscriptionParams {
+
+  private final Map<String, Object> queryParams;
+
+  private ContractTermsForSubscriptionParams(ContractTermsForSubscriptionBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public ContractTermsForSubscriptionBuilder toBuilder() {
+    ContractTermsForSubscriptionBuilder builder = new ContractTermsForSubscriptionBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for ContractTermsForSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ContractTermsForSubscriptionBuilder builder() {
+    return new ContractTermsForSubscriptionBuilder();
+  }
+
+  public static final class ContractTermsForSubscriptionBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private ContractTermsForSubscriptionBuilder() {}
+
+    public ContractTermsForSubscriptionBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public ContractTermsForSubscriptionBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public SortBySortBuilder sortBy() {
+      return new SortBySortBuilder("sort_by", this);
+    }
+
+    public ContractTermsForSubscriptionParams build() {
+      return new ContractTermsForSubscriptionParams(this);
+    }
+
+    public static final class SortBySortBuilder {
+      private final String fieldName;
+      private final ContractTermsForSubscriptionBuilder builder;
+
+      SortBySortBuilder(String fieldName, ContractTermsForSubscriptionBuilder builder) {
+        this.fieldName = fieldName;
+        this.builder = builder;
+      }
+
+      public SortDirection created_at() {
+        return new SortDirection(fieldName, "created_at", builder);
+      }
+    }
+
+    public static final class SortDirection {
+      private final String fieldName;
+      private final String selectedField;
+      private final ContractTermsForSubscriptionBuilder builder;
+
+      SortDirection(
+          String fieldName, String selectedField, ContractTermsForSubscriptionBuilder builder) {
+        this.fieldName = fieldName;
+        this.selectedField = selectedField;
+        this.builder = builder;
+      }
+
+      public ContractTermsForSubscriptionBuilder asc() {
+        builder.queryParams.put(fieldName + "[asc]", selectedField);
+        return builder;
+      }
+
+      public ContractTermsForSubscriptionBuilder desc() {
+        builder.queryParams.put(fieldName + "[desc]", selectedField);
+        return builder;
+      }
+    }
+  }
+
+  public enum SortByAsc {
+    CREATED_AT("created_at"),
+
+    /** An enum member indicating that SortByAsc was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    SortByAsc(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static SortByAsc fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (SortByAsc enumValue : SortByAsc.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum SortByDesc {
+    CREATED_AT("created_at"),
+
+    /** An enum member indicating that SortByDesc was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    SortByDesc(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static SortByDesc fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (SortByDesc enumValue : SortByDesc.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/ImportSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/ImportSubscriptionParams.java
new file mode 100644
index 00000000..d55fc074
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/ImportSubscriptionParams.java
@@ -0,0 +1,4043 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class ImportSubscriptionParams {
+
+  private final String id;
+
+  private final String clientProfileId;
+
+  private final String planId;
+
+  private final Integer planQuantity;
+
+  private final String planQuantityInDecimal;
+
+  private final Long planUnitPrice;
+
+  private final String planUnitPriceInDecimal;
+
+  private final Long setupFee;
+
+  private final Timestamp trialEnd;
+
+  private final Integer billingCycles;
+
+  private final Timestamp startDate;
+
+  private final AutoCollection autoCollection;
+
+  private final String poNumber;
+
+  private final List<String> couponIds;
+
+  private final Integer contractTermBillingCycleOnRenewal;
+
+  private final Status status;
+
+  private final Timestamp currentTermEnd;
+
+  private final Timestamp currentTermStart;
+
+  private final Timestamp trialStart;
+
+  private final Timestamp cancelledAt;
+
+  private final Timestamp startedAt;
+
+  private final Timestamp activatedAt;
+
+  private final Timestamp pauseDate;
+
+  private final Timestamp resumeDate;
+
+  private final Boolean createCurrentTermInvoice;
+
+  private final String affiliateToken;
+
+  private final String invoiceNotes;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final CustomerParams customer;
+
+  private final ContractTermParams contractTerm;
+
+  private final CardParams card;
+
+  private final PaymentMethodParams paymentMethod;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final TransactionParams transaction;
+
+  private final List<AddonsParams> addons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private final List<ChargedEventBasedAddonsParams> chargedEventBasedAddons;
+
+  private final List<CouponsParams> coupons;
+
+  private final Map<String, String> customFields;
+
+  private ImportSubscriptionParams(ImportSubscriptionBuilder builder) {
+
+    this.id = builder.id;
+
+    this.clientProfileId = builder.clientProfileId;
+
+    this.planId = builder.planId;
+
+    this.planQuantity = builder.planQuantity;
+
+    this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+    this.planUnitPrice = builder.planUnitPrice;
+
+    this.planUnitPriceInDecimal = builder.planUnitPriceInDecimal;
+
+    this.setupFee = builder.setupFee;
+
+    this.trialEnd = builder.trialEnd;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.startDate = builder.startDate;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.poNumber = builder.poNumber;
+
+    this.couponIds = builder.couponIds;
+
+    this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+    this.status = builder.status;
+
+    this.currentTermEnd = builder.currentTermEnd;
+
+    this.currentTermStart = builder.currentTermStart;
+
+    this.trialStart = builder.trialStart;
+
+    this.cancelledAt = builder.cancelledAt;
+
+    this.startedAt = builder.startedAt;
+
+    this.activatedAt = builder.activatedAt;
+
+    this.pauseDate = builder.pauseDate;
+
+    this.resumeDate = builder.resumeDate;
+
+    this.createCurrentTermInvoice = builder.createCurrentTermInvoice;
+
+    this.affiliateToken = builder.affiliateToken;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.metaData = builder.metaData;
+
+    this.customer = builder.customer;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.card = builder.card;
+
+    this.paymentMethod = builder.paymentMethod;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.transaction = builder.transaction;
+
+    this.addons = builder.addons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+
+    this.chargedEventBasedAddons = builder.chargedEventBasedAddons;
+
+    this.coupons = builder.coupons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getClientProfileId() {
+    return clientProfileId;
+  }
+
+  public String getPlanId() {
+    return planId;
+  }
+
+  public Integer getPlanQuantity() {
+    return planQuantity;
+  }
+
+  public String getPlanQuantityInDecimal() {
+    return planQuantityInDecimal;
+  }
+
+  public Long getPlanUnitPrice() {
+    return planUnitPrice;
+  }
+
+  public String getPlanUnitPriceInDecimal() {
+    return planUnitPriceInDecimal;
+  }
+
+  public Long getSetupFee() {
+    return setupFee;
+  }
+
+  public Timestamp getTrialEnd() {
+    return trialEnd;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Timestamp getStartDate() {
+    return startDate;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public Integer getContractTermBillingCycleOnRenewal() {
+    return contractTermBillingCycleOnRenewal;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public Timestamp getCurrentTermEnd() {
+    return currentTermEnd;
+  }
+
+  public Timestamp getCurrentTermStart() {
+    return currentTermStart;
+  }
+
+  public Timestamp getTrialStart() {
+    return trialStart;
+  }
+
+  public Timestamp getCancelledAt() {
+    return cancelledAt;
+  }
+
+  public Timestamp getStartedAt() {
+    return startedAt;
+  }
+
+  public Timestamp getActivatedAt() {
+    return activatedAt;
+  }
+
+  public Timestamp getPauseDate() {
+    return pauseDate;
+  }
+
+  public Timestamp getResumeDate() {
+    return resumeDate;
+  }
+
+  public Boolean getCreateCurrentTermInvoice() {
+    return createCurrentTermInvoice;
+  }
+
+  public String getAffiliateToken() {
+    return affiliateToken;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public PaymentMethodParams getPaymentMethod() {
+    return paymentMethod;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public TransactionParams getTransaction() {
+    return transaction;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  public List<ChargedEventBasedAddonsParams> getChargedEventBasedAddons() {
+    return chargedEventBasedAddons;
+  }
+
+  public List<CouponsParams> getCoupons() {
+    return coupons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.clientProfileId != null) {
+
+      formData.put("client_profile_id", this.clientProfileId);
+    }
+
+    if (this.planId != null) {
+
+      formData.put("plan_id", this.planId);
+    }
+
+    if (this.planQuantity != null) {
+
+      formData.put("plan_quantity", this.planQuantity);
+    }
+
+    if (this.planQuantityInDecimal != null) {
+
+      formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+    }
+
+    if (this.planUnitPrice != null) {
+
+      formData.put("plan_unit_price", this.planUnitPrice);
+    }
+
+    if (this.planUnitPriceInDecimal != null) {
+
+      formData.put("plan_unit_price_in_decimal", this.planUnitPriceInDecimal);
+    }
+
+    if (this.setupFee != null) {
+
+      formData.put("setup_fee", this.setupFee);
+    }
+
+    if (this.trialEnd != null) {
+
+      formData.put("trial_end", this.trialEnd);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.startDate != null) {
+
+      formData.put("start_date", this.startDate);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.contractTermBillingCycleOnRenewal != null) {
+
+      formData.put(
+          "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.currentTermEnd != null) {
+
+      formData.put("current_term_end", this.currentTermEnd);
+    }
+
+    if (this.currentTermStart != null) {
+
+      formData.put("current_term_start", this.currentTermStart);
+    }
+
+    if (this.trialStart != null) {
+
+      formData.put("trial_start", this.trialStart);
+    }
+
+    if (this.cancelledAt != null) {
+
+      formData.put("cancelled_at", this.cancelledAt);
+    }
+
+    if (this.startedAt != null) {
+
+      formData.put("started_at", this.startedAt);
+    }
+
+    if (this.activatedAt != null) {
+
+      formData.put("activated_at", this.activatedAt);
+    }
+
+    if (this.pauseDate != null) {
+
+      formData.put("pause_date", this.pauseDate);
+    }
+
+    if (this.resumeDate != null) {
+
+      formData.put("resume_date", this.resumeDate);
+    }
+
+    if (this.createCurrentTermInvoice != null) {
+
+      formData.put("create_current_term_invoice", this.createCurrentTermInvoice);
+    }
+
+    if (this.affiliateToken != null) {
+
+      formData.put("affiliate_token", this.affiliateToken);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentMethod != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentMethod.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_method[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.transaction != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.transaction.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "transaction[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.chargedEventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.chargedEventBasedAddons.size(); i++) {
+        ChargedEventBasedAddonsParams item = this.chargedEventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charged_event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.coupons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.coupons.size(); i++) {
+        CouponsParams item = this.coupons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for ImportSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ImportSubscriptionBuilder builder() {
+    return new ImportSubscriptionBuilder();
+  }
+
+  public static final class ImportSubscriptionBuilder {
+
+    private String id;
+
+    private String clientProfileId;
+
+    private String planId;
+
+    private Integer planQuantity;
+
+    private String planQuantityInDecimal;
+
+    private Long planUnitPrice;
+
+    private String planUnitPriceInDecimal;
+
+    private Long setupFee;
+
+    private Timestamp trialEnd;
+
+    private Integer billingCycles;
+
+    private Timestamp startDate;
+
+    private AutoCollection autoCollection;
+
+    private String poNumber;
+
+    private List<String> couponIds;
+
+    private Integer contractTermBillingCycleOnRenewal;
+
+    private Status status;
+
+    private Timestamp currentTermEnd;
+
+    private Timestamp currentTermStart;
+
+    private Timestamp trialStart;
+
+    private Timestamp cancelledAt;
+
+    private Timestamp startedAt;
+
+    private Timestamp activatedAt;
+
+    private Timestamp pauseDate;
+
+    private Timestamp resumeDate;
+
+    private Boolean createCurrentTermInvoice;
+
+    private String affiliateToken;
+
+    private String invoiceNotes;
+
+    private java.util.Map<String, Object> metaData;
+
+    private CustomerParams customer;
+
+    private ContractTermParams contractTerm;
+
+    private CardParams card;
+
+    private PaymentMethodParams paymentMethod;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private TransactionParams transaction;
+
+    private List<AddonsParams> addons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private List<ChargedEventBasedAddonsParams> chargedEventBasedAddons;
+
+    private List<CouponsParams> coupons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private ImportSubscriptionBuilder() {}
+
+    public ImportSubscriptionBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder clientProfileId(String value) {
+      this.clientProfileId = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder planId(String value) {
+      this.planId = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder planQuantity(Integer value) {
+      this.planQuantity = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder planQuantityInDecimal(String value) {
+      this.planQuantityInDecimal = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder planUnitPrice(Long value) {
+      this.planUnitPrice = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder planUnitPriceInDecimal(String value) {
+      this.planUnitPriceInDecimal = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder setupFee(Long value) {
+      this.setupFee = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder trialEnd(Timestamp value) {
+      this.trialEnd = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder startDate(Timestamp value) {
+      this.startDate = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder contractTermBillingCycleOnRenewal(Integer value) {
+      this.contractTermBillingCycleOnRenewal = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder currentTermEnd(Timestamp value) {
+      this.currentTermEnd = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder currentTermStart(Timestamp value) {
+      this.currentTermStart = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder trialStart(Timestamp value) {
+      this.trialStart = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder cancelledAt(Timestamp value) {
+      this.cancelledAt = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder startedAt(Timestamp value) {
+      this.startedAt = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder activatedAt(Timestamp value) {
+      this.activatedAt = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder pauseDate(Timestamp value) {
+      this.pauseDate = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder resumeDate(Timestamp value) {
+      this.resumeDate = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder createCurrentTermInvoice(Boolean value) {
+      this.createCurrentTermInvoice = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder affiliateToken(String value) {
+      this.affiliateToken = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder paymentMethod(PaymentMethodParams value) {
+      this.paymentMethod = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder transaction(TransactionParams value) {
+      this.transaction = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public ImportSubscriptionBuilder chargedEventBasedAddons(
+        List<ChargedEventBasedAddonsParams> value) {
+      this.chargedEventBasedAddons = value;
+      return this;
+    }
+
+    @Deprecated
+    public ImportSubscriptionBuilder coupons(List<CouponsParams> value) {
+      this.coupons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public ImportSubscriptionBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public ImportSubscriptionBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public ImportSubscriptionParams build() {
+      return new ImportSubscriptionParams(this);
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Status {
+    FUTURE("future"),
+
+    IN_TRIAL("in_trial"),
+
+    ACTIVE("active"),
+
+    NON_RENEWING("non_renewing"),
+
+    PAUSED("paused"),
+
+    CANCELLED("cancelled"),
+
+    TRANSFERRED("transferred"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private final String email;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String locale;
+
+    private final Taxability taxability;
+
+    private final EntityCode entityCode;
+
+    private final String exemptNumber;
+
+    private final Integer netTermDays;
+
+    private final TaxjarExemptionCategory taxjarExemptionCategory;
+
+    private final CustomerType customerType;
+
+    private final AutoCollection autoCollection;
+
+    private final Boolean allowDirectDebit;
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.email = builder.email;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.locale = builder.locale;
+
+      this.taxability = builder.taxability;
+
+      this.entityCode = builder.entityCode;
+
+      this.exemptNumber = builder.exemptNumber;
+
+      this.netTermDays = builder.netTermDays;
+
+      this.taxjarExemptionCategory = builder.taxjarExemptionCategory;
+
+      this.customerType = builder.customerType;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.allowDirectDebit = builder.allowDirectDebit;
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLocale() {
+      return locale;
+    }
+
+    public Taxability getTaxability() {
+      return taxability;
+    }
+
+    public EntityCode getEntityCode() {
+      return entityCode;
+    }
+
+    public String getExemptNumber() {
+      return exemptNumber;
+    }
+
+    public Integer getNetTermDays() {
+      return netTermDays;
+    }
+
+    public TaxjarExemptionCategory getTaxjarExemptionCategory() {
+      return taxjarExemptionCategory;
+    }
+
+    public CustomerType getCustomerType() {
+      return customerType;
+    }
+
+    public AutoCollection getAutoCollection() {
+      return autoCollection;
+    }
+
+    public Boolean getAllowDirectDebit() {
+      return allowDirectDebit;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.locale != null) {
+
+        formData.put("locale", this.locale);
+      }
+
+      if (this.taxability != null) {
+
+        formData.put("taxability", this.taxability);
+      }
+
+      if (this.entityCode != null) {
+
+        formData.put("entity_code", this.entityCode);
+      }
+
+      if (this.exemptNumber != null) {
+
+        formData.put("exempt_number", this.exemptNumber);
+      }
+
+      if (this.netTermDays != null) {
+
+        formData.put("net_term_days", this.netTermDays);
+      }
+
+      if (this.taxjarExemptionCategory != null) {
+
+        formData.put("taxjar_exemption_category", this.taxjarExemptionCategory);
+      }
+
+      if (this.customerType != null) {
+
+        formData.put("customer_type", this.customerType);
+      }
+
+      if (this.autoCollection != null) {
+
+        formData.put("auto_collection", this.autoCollection);
+      }
+
+      if (this.allowDirectDebit != null) {
+
+        formData.put("allow_direct_debit", this.allowDirectDebit);
+      }
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private String email;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String company;
+
+      private String phone;
+
+      private String locale;
+
+      private Taxability taxability;
+
+      private EntityCode entityCode;
+
+      private String exemptNumber;
+
+      private Integer netTermDays;
+
+      private TaxjarExemptionCategory taxjarExemptionCategory;
+
+      private CustomerType customerType;
+
+      private AutoCollection autoCollection;
+
+      private Boolean allowDirectDebit;
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CustomerBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CustomerBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public CustomerBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public CustomerBuilder locale(String value) {
+        this.locale = value;
+        return this;
+      }
+
+      public CustomerBuilder taxability(Taxability value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerBuilder entityCode(EntityCode value) {
+        this.entityCode = value;
+        return this;
+      }
+
+      public CustomerBuilder exemptNumber(String value) {
+        this.exemptNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder netTermDays(Integer value) {
+        this.netTermDays = value;
+        return this;
+      }
+
+      public CustomerBuilder taxjarExemptionCategory(TaxjarExemptionCategory value) {
+        this.taxjarExemptionCategory = value;
+        return this;
+      }
+
+      public CustomerBuilder customerType(CustomerType value) {
+        this.customerType = value;
+        return this;
+      }
+
+      public CustomerBuilder autoCollection(AutoCollection value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public CustomerBuilder allowDirectDebit(Boolean value) {
+        this.allowDirectDebit = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+
+    public enum Taxability {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Taxability was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Taxability(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Taxability fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Taxability enumValue : Taxability.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum EntityCode {
+      A("a"),
+
+      B("b"),
+
+      C("c"),
+
+      D("d"),
+
+      E("e"),
+
+      F("f"),
+
+      G("g"),
+
+      H("h"),
+
+      I("i"),
+
+      J("j"),
+
+      K("k"),
+
+      L("l"),
+
+      M("m"),
+
+      N("n"),
+
+      P("p"),
+
+      Q("q"),
+
+      R("r"),
+
+      MED_1("med1"),
+
+      MED_2("med2"),
+
+      /** An enum member indicating that EntityCode was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityCode(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityCode fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityCode enumValue : EntityCode.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum TaxjarExemptionCategory {
+      WHOLESALE("wholesale"),
+
+      GOVERNMENT("government"),
+
+      OTHER("other"),
+
+      /**
+       * An enum member indicating that TaxjarExemptionCategory was instantiated with an unknown
+       * value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      TaxjarExemptionCategory(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static TaxjarExemptionCategory fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (TaxjarExemptionCategory enumValue : TaxjarExemptionCategory.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum CustomerType {
+      RESIDENTIAL("residential"),
+
+      BUSINESS("business"),
+
+      SENIOR_CITIZEN("senior_citizen"),
+
+      INDUSTRIAL("industrial"),
+
+      /** An enum member indicating that CustomerType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      CustomerType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static CustomerType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (CustomerType enumValue : CustomerType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum AutoCollection {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AutoCollection(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AutoCollection fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AutoCollection enumValue : AutoCollection.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final String id;
+
+    private final Timestamp createdAt;
+
+    private final Timestamp contractStart;
+
+    private final Integer billingCycle;
+
+    private final Long totalAmountRaised;
+
+    private final Long totalAmountRaisedBeforeTax;
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.id = builder.id;
+
+      this.createdAt = builder.createdAt;
+
+      this.contractStart = builder.contractStart;
+
+      this.billingCycle = builder.billingCycle;
+
+      this.totalAmountRaised = builder.totalAmountRaised;
+
+      this.totalAmountRaisedBeforeTax = builder.totalAmountRaisedBeforeTax;
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getCreatedAt() {
+      return createdAt;
+    }
+
+    public Timestamp getContractStart() {
+      return contractStart;
+    }
+
+    public Integer getBillingCycle() {
+      return billingCycle;
+    }
+
+    public Long getTotalAmountRaised() {
+      return totalAmountRaised;
+    }
+
+    public Long getTotalAmountRaisedBeforeTax() {
+      return totalAmountRaisedBeforeTax;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.createdAt != null) {
+
+        formData.put("created_at", this.createdAt);
+      }
+
+      if (this.contractStart != null) {
+
+        formData.put("contract_start", this.contractStart);
+      }
+
+      if (this.billingCycle != null) {
+
+        formData.put("billing_cycle", this.billingCycle);
+      }
+
+      if (this.totalAmountRaised != null) {
+
+        formData.put("total_amount_raised", this.totalAmountRaised);
+      }
+
+      if (this.totalAmountRaisedBeforeTax != null) {
+
+        formData.put("total_amount_raised_before_tax", this.totalAmountRaisedBeforeTax);
+      }
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private String id;
+
+      private Timestamp createdAt;
+
+      private Timestamp contractStart;
+
+      private Integer billingCycle;
+
+      private Long totalAmountRaised;
+
+      private Long totalAmountRaisedBeforeTax;
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public ContractTermBuilder createdAt(Timestamp value) {
+        this.createdAt = value;
+        return this;
+      }
+
+      public ContractTermBuilder contractStart(Timestamp value) {
+        this.contractStart = value;
+        return this;
+      }
+
+      public ContractTermBuilder billingCycle(Integer value) {
+        this.billingCycle = value;
+        return this;
+      }
+
+      public ContractTermBuilder totalAmountRaised(Long value) {
+        this.totalAmountRaised = value;
+        return this;
+      }
+
+      public ContractTermBuilder totalAmountRaisedBeforeTax(Long value) {
+        this.totalAmountRaisedBeforeTax = value;
+        return this;
+      }
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String tmpToken;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String number;
+
+    private final Integer expiryMonth;
+
+    private final Integer expiryYear;
+
+    private final String cvv;
+
+    private final PreferredScheme preferredScheme;
+
+    private final String billingAddr1;
+
+    private final String billingAddr2;
+
+    private final String billingCity;
+
+    private final String billingStateCode;
+
+    private final String billingState;
+
+    private final String billingZip;
+
+    private final String billingCountry;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.number = builder.number;
+
+      this.expiryMonth = builder.expiryMonth;
+
+      this.expiryYear = builder.expiryYear;
+
+      this.cvv = builder.cvv;
+
+      this.preferredScheme = builder.preferredScheme;
+
+      this.billingAddr1 = builder.billingAddr1;
+
+      this.billingAddr2 = builder.billingAddr2;
+
+      this.billingCity = builder.billingCity;
+
+      this.billingStateCode = builder.billingStateCode;
+
+      this.billingState = builder.billingState;
+
+      this.billingZip = builder.billingZip;
+
+      this.billingCountry = builder.billingCountry;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getNumber() {
+      return number;
+    }
+
+    public Integer getExpiryMonth() {
+      return expiryMonth;
+    }
+
+    public Integer getExpiryYear() {
+      return expiryYear;
+    }
+
+    public String getCvv() {
+      return cvv;
+    }
+
+    public PreferredScheme getPreferredScheme() {
+      return preferredScheme;
+    }
+
+    public String getBillingAddr1() {
+      return billingAddr1;
+    }
+
+    public String getBillingAddr2() {
+      return billingAddr2;
+    }
+
+    public String getBillingCity() {
+      return billingCity;
+    }
+
+    public String getBillingStateCode() {
+      return billingStateCode;
+    }
+
+    public String getBillingState() {
+      return billingState;
+    }
+
+    public String getBillingZip() {
+      return billingZip;
+    }
+
+    public String getBillingCountry() {
+      return billingCountry;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.number != null) {
+
+        formData.put("number", this.number);
+      }
+
+      if (this.expiryMonth != null) {
+
+        formData.put("expiry_month", this.expiryMonth);
+      }
+
+      if (this.expiryYear != null) {
+
+        formData.put("expiry_year", this.expiryYear);
+      }
+
+      if (this.cvv != null) {
+
+        formData.put("cvv", this.cvv);
+      }
+
+      if (this.preferredScheme != null) {
+
+        formData.put("preferred_scheme", this.preferredScheme);
+      }
+
+      if (this.billingAddr1 != null) {
+
+        formData.put("billing_addr1", this.billingAddr1);
+      }
+
+      if (this.billingAddr2 != null) {
+
+        formData.put("billing_addr2", this.billingAddr2);
+      }
+
+      if (this.billingCity != null) {
+
+        formData.put("billing_city", this.billingCity);
+      }
+
+      if (this.billingStateCode != null) {
+
+        formData.put("billing_state_code", this.billingStateCode);
+      }
+
+      if (this.billingState != null) {
+
+        formData.put("billing_state", this.billingState);
+      }
+
+      if (this.billingZip != null) {
+
+        formData.put("billing_zip", this.billingZip);
+      }
+
+      if (this.billingCountry != null) {
+
+        formData.put("billing_country", this.billingCountry);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String tmpToken;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String number;
+
+      private Integer expiryMonth;
+
+      private Integer expiryYear;
+
+      private String cvv;
+
+      private PreferredScheme preferredScheme;
+
+      private String billingAddr1;
+
+      private String billingAddr2;
+
+      private String billingCity;
+
+      private String billingStateCode;
+
+      private String billingState;
+
+      private String billingZip;
+
+      private String billingCountry;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      @Deprecated
+      public CardBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public CardBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CardBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CardBuilder number(String value) {
+        this.number = value;
+        return this;
+      }
+
+      public CardBuilder expiryMonth(Integer value) {
+        this.expiryMonth = value;
+        return this;
+      }
+
+      public CardBuilder expiryYear(Integer value) {
+        this.expiryYear = value;
+        return this;
+      }
+
+      public CardBuilder cvv(String value) {
+        this.cvv = value;
+        return this;
+      }
+
+      public CardBuilder preferredScheme(PreferredScheme value) {
+        this.preferredScheme = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr1(String value) {
+        this.billingAddr1 = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr2(String value) {
+        this.billingAddr2 = value;
+        return this;
+      }
+
+      public CardBuilder billingCity(String value) {
+        this.billingCity = value;
+        return this;
+      }
+
+      public CardBuilder billingStateCode(String value) {
+        this.billingStateCode = value;
+        return this;
+      }
+
+      public CardBuilder billingState(String value) {
+        this.billingState = value;
+        return this;
+      }
+
+      public CardBuilder billingZip(String value) {
+        this.billingZip = value;
+        return this;
+      }
+
+      public CardBuilder billingCountry(String value) {
+        this.billingCountry = value;
+        return this;
+      }
+
+      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PreferredScheme {
+      CARTES_BANCAIRES("cartes_bancaires"),
+
+      MASTERCARD("mastercard"),
+
+      VISA("visa"),
+
+      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PreferredScheme(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PreferredScheme fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PreferredScheme enumValue : PreferredScheme.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentMethodParams {
+
+    private final Type type;
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String referenceId;
+
+    private final String issuingCountry;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentMethodParams(PaymentMethodBuilder builder) {
+
+      this.type = builder.type;
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.referenceId = builder.referenceId;
+
+      this.issuingCountry = builder.issuingCountry;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getIssuingCountry() {
+      return issuingCountry;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.issuingCountry != null) {
+
+        formData.put("issuing_country", this.issuingCountry);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentMethodBuilder builder() {
+      return new PaymentMethodBuilder();
+    }
+
+    public static final class PaymentMethodBuilder {
+
+      private Type type;
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String referenceId;
+
+      private String issuingCountry;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentMethodBuilder() {}
+
+      public PaymentMethodBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentMethodBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder issuingCountry(String value) {
+        this.issuingCountry = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentMethodParams build() {
+        return new PaymentMethodParams(this);
+      }
+    }
+
+    public enum Type {
+      CARD("card"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      GENERIC("generic"),
+
+      ALIPAY("alipay"),
+
+      UNIONPAY("unionpay"),
+
+      APPLE_PAY("apple_pay"),
+
+      WECHAT_PAY("wechat_pay"),
+
+      IDEAL("ideal"),
+
+      GOOGLE_PAY("google_pay"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GIROPAY("giropay"),
+
+      DOTPAY("dotpay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      VENMO("venmo"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      GOCARDLESS("gocardless"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TransactionParams {
+
+    private final Long amount;
+
+    private final PaymentMethod paymentMethod;
+
+    private final String referenceNumber;
+
+    private final Timestamp date;
+
+    private TransactionParams(TransactionBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.paymentMethod = builder.paymentMethod;
+
+      this.referenceNumber = builder.referenceNumber;
+
+      this.date = builder.date;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public PaymentMethod getPaymentMethod() {
+      return paymentMethod;
+    }
+
+    public String getReferenceNumber() {
+      return referenceNumber;
+    }
+
+    public Timestamp getDate() {
+      return date;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.paymentMethod != null) {
+
+        formData.put("payment_method", this.paymentMethod);
+      }
+
+      if (this.referenceNumber != null) {
+
+        formData.put("reference_number", this.referenceNumber);
+      }
+
+      if (this.date != null) {
+
+        formData.put("date", this.date);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TransactionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TransactionBuilder builder() {
+      return new TransactionBuilder();
+    }
+
+    public static final class TransactionBuilder {
+
+      private Long amount;
+
+      private PaymentMethod paymentMethod;
+
+      private String referenceNumber;
+
+      private Timestamp date;
+
+      private TransactionBuilder() {}
+
+      public TransactionBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public TransactionBuilder paymentMethod(PaymentMethod value) {
+        this.paymentMethod = value;
+        return this;
+      }
+
+      public TransactionBuilder referenceNumber(String value) {
+        this.referenceNumber = value;
+        return this;
+      }
+
+      public TransactionBuilder date(Timestamp value) {
+        this.date = value;
+        return this;
+      }
+
+      public TransactionParams build() {
+        return new TransactionParams(this);
+      }
+    }
+
+    public enum PaymentMethod {
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      OTHER("other"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethod enumValue : PaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriodInDays;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriodInDays;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChargedEventBasedAddonsParams {
+
+    private final String id;
+
+    private final Timestamp lastChargedAt;
+
+    private ChargedEventBasedAddonsParams(ChargedEventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.lastChargedAt = builder.lastChargedAt;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getLastChargedAt() {
+      return lastChargedAt;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.lastChargedAt != null) {
+
+        formData.put("last_charged_at", this.lastChargedAt);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargedEventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargedEventBasedAddonsBuilder builder() {
+      return new ChargedEventBasedAddonsBuilder();
+    }
+
+    public static final class ChargedEventBasedAddonsBuilder {
+
+      private String id;
+
+      private Timestamp lastChargedAt;
+
+      private ChargedEventBasedAddonsBuilder() {}
+
+      public ChargedEventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public ChargedEventBasedAddonsBuilder lastChargedAt(Timestamp value) {
+        this.lastChargedAt = value;
+        return this;
+      }
+
+      public ChargedEventBasedAddonsParams build() {
+        return new ChargedEventBasedAddonsParams(this);
+      }
+    }
+  }
+
+  public static final class CouponsParams {
+
+    private final String couponId;
+
+    private final Timestamp applyTill;
+
+    private CouponsParams(CouponsBuilder builder) {
+
+      this.couponId = builder.couponId;
+
+      this.applyTill = builder.applyTill;
+    }
+
+    public String getCouponId() {
+      return couponId;
+    }
+
+    public Timestamp getApplyTill() {
+      return applyTill;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.couponId != null) {
+
+        formData.put("coupon_id", this.couponId);
+      }
+
+      if (this.applyTill != null) {
+
+        formData.put("apply_till", this.applyTill);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsBuilder builder() {
+      return new CouponsBuilder();
+    }
+
+    public static final class CouponsBuilder {
+
+      private String couponId;
+
+      private Timestamp applyTill;
+
+      private CouponsBuilder() {}
+
+      public CouponsBuilder couponId(String value) {
+        this.couponId = value;
+        return this;
+      }
+
+      public CouponsBuilder applyTill(Timestamp value) {
+        this.applyTill = value;
+        return this;
+      }
+
+      public CouponsParams build() {
+        return new CouponsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionAddChargeAtTermEndParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionAddChargeAtTermEndParams.java
new file mode 100644
index 00000000..c4a8e0e4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionAddChargeAtTermEndParams.java
@@ -0,0 +1,233 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class SubscriptionAddChargeAtTermEndParams {
+
+  private final Long amount;
+
+  private final String description;
+
+  private final String amountInDecimal;
+
+  private final AvalaraSaleType avalaraSaleType;
+
+  private final Integer avalaraTransactionType;
+
+  private final Integer avalaraServiceType;
+
+  private final Timestamp dateFrom;
+
+  private final Timestamp dateTo;
+
+  private SubscriptionAddChargeAtTermEndParams(SubscriptionAddChargeAtTermEndBuilder builder) {
+
+    this.amount = builder.amount;
+
+    this.description = builder.description;
+
+    this.amountInDecimal = builder.amountInDecimal;
+
+    this.avalaraSaleType = builder.avalaraSaleType;
+
+    this.avalaraTransactionType = builder.avalaraTransactionType;
+
+    this.avalaraServiceType = builder.avalaraServiceType;
+
+    this.dateFrom = builder.dateFrom;
+
+    this.dateTo = builder.dateTo;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public String getAmountInDecimal() {
+    return amountInDecimal;
+  }
+
+  public AvalaraSaleType getAvalaraSaleType() {
+    return avalaraSaleType;
+  }
+
+  public Integer getAvalaraTransactionType() {
+    return avalaraTransactionType;
+  }
+
+  public Integer getAvalaraServiceType() {
+    return avalaraServiceType;
+  }
+
+  public Timestamp getDateFrom() {
+    return dateFrom;
+  }
+
+  public Timestamp getDateTo() {
+    return dateTo;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.amountInDecimal != null) {
+
+      formData.put("amount_in_decimal", this.amountInDecimal);
+    }
+
+    if (this.avalaraSaleType != null) {
+
+      formData.put("avalara_sale_type", this.avalaraSaleType);
+    }
+
+    if (this.avalaraTransactionType != null) {
+
+      formData.put("avalara_transaction_type", this.avalaraTransactionType);
+    }
+
+    if (this.avalaraServiceType != null) {
+
+      formData.put("avalara_service_type", this.avalaraServiceType);
+    }
+
+    if (this.dateFrom != null) {
+
+      formData.put("date_from", this.dateFrom);
+    }
+
+    if (this.dateTo != null) {
+
+      formData.put("date_to", this.dateTo);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionAddChargeAtTermEndParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionAddChargeAtTermEndBuilder builder() {
+    return new SubscriptionAddChargeAtTermEndBuilder();
+  }
+
+  public static final class SubscriptionAddChargeAtTermEndBuilder {
+
+    private Long amount;
+
+    private String description;
+
+    private String amountInDecimal;
+
+    private AvalaraSaleType avalaraSaleType;
+
+    private Integer avalaraTransactionType;
+
+    private Integer avalaraServiceType;
+
+    private Timestamp dateFrom;
+
+    private Timestamp dateTo;
+
+    private SubscriptionAddChargeAtTermEndBuilder() {}
+
+    public SubscriptionAddChargeAtTermEndBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public SubscriptionAddChargeAtTermEndBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public SubscriptionAddChargeAtTermEndBuilder amountInDecimal(String value) {
+      this.amountInDecimal = value;
+      return this;
+    }
+
+    public SubscriptionAddChargeAtTermEndBuilder avalaraSaleType(AvalaraSaleType value) {
+      this.avalaraSaleType = value;
+      return this;
+    }
+
+    public SubscriptionAddChargeAtTermEndBuilder avalaraTransactionType(Integer value) {
+      this.avalaraTransactionType = value;
+      return this;
+    }
+
+    public SubscriptionAddChargeAtTermEndBuilder avalaraServiceType(Integer value) {
+      this.avalaraServiceType = value;
+      return this;
+    }
+
+    public SubscriptionAddChargeAtTermEndBuilder dateFrom(Timestamp value) {
+      this.dateFrom = value;
+      return this;
+    }
+
+    public SubscriptionAddChargeAtTermEndBuilder dateTo(Timestamp value) {
+      this.dateTo = value;
+      return this;
+    }
+
+    public SubscriptionAddChargeAtTermEndParams build() {
+      return new SubscriptionAddChargeAtTermEndParams(this);
+    }
+  }
+
+  public enum AvalaraSaleType {
+    WHOLESALE("wholesale"),
+
+    RETAIL("retail"),
+
+    CONSUMED("consumed"),
+
+    VENDOR_USE("vendor_use"),
+
+    /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AvalaraSaleType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AvalaraSaleType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCancelForItemsParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCancelForItemsParams.java
new file mode 100644
index 00000000..ab0c442a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCancelForItemsParams.java
@@ -0,0 +1,621 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class SubscriptionCancelForItemsParams {
+
+  private final CancelOption cancelOption;
+
+  private final Boolean endOfTerm;
+
+  private final Timestamp cancelAt;
+
+  private final CreditOptionForCurrentTermCharges creditOptionForCurrentTermCharges;
+
+  private final UnbilledChargesOption unbilledChargesOption;
+
+  private final AccountReceivablesHandling accountReceivablesHandling;
+
+  private final RefundableCreditsHandling refundableCreditsHandling;
+
+  private final ContractTermCancelOption contractTermCancelOption;
+
+  private final Timestamp invoiceDate;
+
+  private final String cancelReasonCode;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private SubscriptionCancelForItemsParams(SubscriptionCancelForItemsBuilder builder) {
+
+    this.cancelOption = builder.cancelOption;
+
+    this.endOfTerm = builder.endOfTerm;
+
+    this.cancelAt = builder.cancelAt;
+
+    this.creditOptionForCurrentTermCharges = builder.creditOptionForCurrentTermCharges;
+
+    this.unbilledChargesOption = builder.unbilledChargesOption;
+
+    this.accountReceivablesHandling = builder.accountReceivablesHandling;
+
+    this.refundableCreditsHandling = builder.refundableCreditsHandling;
+
+    this.contractTermCancelOption = builder.contractTermCancelOption;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.cancelReasonCode = builder.cancelReasonCode;
+
+    this.subscriptionItems = builder.subscriptionItems;
+  }
+
+  public CancelOption getCancelOption() {
+    return cancelOption;
+  }
+
+  public Boolean getEndOfTerm() {
+    return endOfTerm;
+  }
+
+  public Timestamp getCancelAt() {
+    return cancelAt;
+  }
+
+  public CreditOptionForCurrentTermCharges getCreditOptionForCurrentTermCharges() {
+    return creditOptionForCurrentTermCharges;
+  }
+
+  public UnbilledChargesOption getUnbilledChargesOption() {
+    return unbilledChargesOption;
+  }
+
+  public AccountReceivablesHandling getAccountReceivablesHandling() {
+    return accountReceivablesHandling;
+  }
+
+  public RefundableCreditsHandling getRefundableCreditsHandling() {
+    return refundableCreditsHandling;
+  }
+
+  public ContractTermCancelOption getContractTermCancelOption() {
+    return contractTermCancelOption;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public String getCancelReasonCode() {
+    return cancelReasonCode;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.cancelOption != null) {
+
+      formData.put("cancel_option", this.cancelOption);
+    }
+
+    if (this.endOfTerm != null) {
+
+      formData.put("end_of_term", this.endOfTerm);
+    }
+
+    if (this.cancelAt != null) {
+
+      formData.put("cancel_at", this.cancelAt);
+    }
+
+    if (this.creditOptionForCurrentTermCharges != null) {
+
+      formData.put(
+          "credit_option_for_current_term_charges", this.creditOptionForCurrentTermCharges);
+    }
+
+    if (this.unbilledChargesOption != null) {
+
+      formData.put("unbilled_charges_option", this.unbilledChargesOption);
+    }
+
+    if (this.accountReceivablesHandling != null) {
+
+      formData.put("account_receivables_handling", this.accountReceivablesHandling);
+    }
+
+    if (this.refundableCreditsHandling != null) {
+
+      formData.put("refundable_credits_handling", this.refundableCreditsHandling);
+    }
+
+    if (this.contractTermCancelOption != null) {
+
+      formData.put("contract_term_cancel_option", this.contractTermCancelOption);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.cancelReasonCode != null) {
+
+      formData.put("cancel_reason_code", this.cancelReasonCode);
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionCancelForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionCancelForItemsBuilder builder() {
+    return new SubscriptionCancelForItemsBuilder();
+  }
+
+  public static final class SubscriptionCancelForItemsBuilder {
+
+    private CancelOption cancelOption;
+
+    private Boolean endOfTerm;
+
+    private Timestamp cancelAt;
+
+    private CreditOptionForCurrentTermCharges creditOptionForCurrentTermCharges;
+
+    private UnbilledChargesOption unbilledChargesOption;
+
+    private AccountReceivablesHandling accountReceivablesHandling;
+
+    private RefundableCreditsHandling refundableCreditsHandling;
+
+    private ContractTermCancelOption contractTermCancelOption;
+
+    private Timestamp invoiceDate;
+
+    private String cancelReasonCode;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private SubscriptionCancelForItemsBuilder() {}
+
+    public SubscriptionCancelForItemsBuilder cancelOption(CancelOption value) {
+      this.cancelOption = value;
+      return this;
+    }
+
+    public SubscriptionCancelForItemsBuilder endOfTerm(Boolean value) {
+      this.endOfTerm = value;
+      return this;
+    }
+
+    public SubscriptionCancelForItemsBuilder cancelAt(Timestamp value) {
+      this.cancelAt = value;
+      return this;
+    }
+
+    public SubscriptionCancelForItemsBuilder creditOptionForCurrentTermCharges(
+        CreditOptionForCurrentTermCharges value) {
+      this.creditOptionForCurrentTermCharges = value;
+      return this;
+    }
+
+    public SubscriptionCancelForItemsBuilder unbilledChargesOption(UnbilledChargesOption value) {
+      this.unbilledChargesOption = value;
+      return this;
+    }
+
+    public SubscriptionCancelForItemsBuilder accountReceivablesHandling(
+        AccountReceivablesHandling value) {
+      this.accountReceivablesHandling = value;
+      return this;
+    }
+
+    public SubscriptionCancelForItemsBuilder refundableCreditsHandling(
+        RefundableCreditsHandling value) {
+      this.refundableCreditsHandling = value;
+      return this;
+    }
+
+    public SubscriptionCancelForItemsBuilder contractTermCancelOption(
+        ContractTermCancelOption value) {
+      this.contractTermCancelOption = value;
+      return this;
+    }
+
+    public SubscriptionCancelForItemsBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public SubscriptionCancelForItemsBuilder cancelReasonCode(String value) {
+      this.cancelReasonCode = value;
+      return this;
+    }
+
+    public SubscriptionCancelForItemsBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public SubscriptionCancelForItemsParams build() {
+      return new SubscriptionCancelForItemsParams(this);
+    }
+  }
+
+  public enum CancelOption {
+    IMMEDIATELY("immediately"),
+
+    END_OF_TERM("end_of_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    END_OF_BILLING_TERM("end_of_billing_term"),
+
+    /** An enum member indicating that CancelOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CancelOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CancelOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CancelOption enumValue : CancelOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum CreditOptionForCurrentTermCharges {
+    NONE("none"),
+
+    PRORATE("prorate"),
+
+    FULL("full"),
+
+    /**
+     * An enum member indicating that CreditOptionForCurrentTermCharges was instantiated with an
+     * unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    CreditOptionForCurrentTermCharges(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CreditOptionForCurrentTermCharges fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CreditOptionForCurrentTermCharges enumValue :
+          CreditOptionForCurrentTermCharges.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum UnbilledChargesOption {
+    INVOICE("invoice"),
+
+    DELETE("delete"),
+
+    /**
+     * An enum member indicating that UnbilledChargesOption was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    UnbilledChargesOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static UnbilledChargesOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (UnbilledChargesOption enumValue : UnbilledChargesOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AccountReceivablesHandling {
+    NO_ACTION("no_action"),
+
+    SCHEDULE_PAYMENT_COLLECTION("schedule_payment_collection"),
+
+    WRITE_OFF("write_off"),
+
+    /**
+     * An enum member indicating that AccountReceivablesHandling was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    AccountReceivablesHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AccountReceivablesHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AccountReceivablesHandling enumValue : AccountReceivablesHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum RefundableCreditsHandling {
+    NO_ACTION("no_action"),
+
+    SCHEDULE_REFUND("schedule_refund"),
+
+    /**
+     * An enum member indicating that RefundableCreditsHandling was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    RefundableCreditsHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static RefundableCreditsHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (RefundableCreditsHandling enumValue : RefundableCreditsHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ContractTermCancelOption {
+    TERMINATE_IMMEDIATELY("terminate_immediately"),
+
+    END_OF_CONTRACT_TERM("end_of_contract_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    END_OF_SUBSCRIPTION_BILLING_TERM("end_of_subscription_billing_term"),
+
+    /**
+     * An enum member indicating that ContractTermCancelOption was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    ContractTermCancelOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ContractTermCancelOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ContractTermCancelOption enumValue : ContractTermCancelOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriodDays;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriodDays;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCancelParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCancelParams.java
new file mode 100644
index 00000000..90e69519
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCancelParams.java
@@ -0,0 +1,577 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class SubscriptionCancelParams {
+
+  private final CancelOption cancelOption;
+
+  private final Boolean endOfTerm;
+
+  private final Timestamp cancelAt;
+
+  private final CreditOptionForCurrentTermCharges creditOptionForCurrentTermCharges;
+
+  private final UnbilledChargesOption unbilledChargesOption;
+
+  private final AccountReceivablesHandling accountReceivablesHandling;
+
+  private final RefundableCreditsHandling refundableCreditsHandling;
+
+  private final ContractTermCancelOption contractTermCancelOption;
+
+  private final Timestamp invoiceDate;
+
+  private final String cancelReasonCode;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private SubscriptionCancelParams(SubscriptionCancelBuilder builder) {
+
+    this.cancelOption = builder.cancelOption;
+
+    this.endOfTerm = builder.endOfTerm;
+
+    this.cancelAt = builder.cancelAt;
+
+    this.creditOptionForCurrentTermCharges = builder.creditOptionForCurrentTermCharges;
+
+    this.unbilledChargesOption = builder.unbilledChargesOption;
+
+    this.accountReceivablesHandling = builder.accountReceivablesHandling;
+
+    this.refundableCreditsHandling = builder.refundableCreditsHandling;
+
+    this.contractTermCancelOption = builder.contractTermCancelOption;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.cancelReasonCode = builder.cancelReasonCode;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+  }
+
+  public CancelOption getCancelOption() {
+    return cancelOption;
+  }
+
+  public Boolean getEndOfTerm() {
+    return endOfTerm;
+  }
+
+  public Timestamp getCancelAt() {
+    return cancelAt;
+  }
+
+  public CreditOptionForCurrentTermCharges getCreditOptionForCurrentTermCharges() {
+    return creditOptionForCurrentTermCharges;
+  }
+
+  public UnbilledChargesOption getUnbilledChargesOption() {
+    return unbilledChargesOption;
+  }
+
+  public AccountReceivablesHandling getAccountReceivablesHandling() {
+    return accountReceivablesHandling;
+  }
+
+  public RefundableCreditsHandling getRefundableCreditsHandling() {
+    return refundableCreditsHandling;
+  }
+
+  public ContractTermCancelOption getContractTermCancelOption() {
+    return contractTermCancelOption;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public String getCancelReasonCode() {
+    return cancelReasonCode;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.cancelOption != null) {
+
+      formData.put("cancel_option", this.cancelOption);
+    }
+
+    if (this.endOfTerm != null) {
+
+      formData.put("end_of_term", this.endOfTerm);
+    }
+
+    if (this.cancelAt != null) {
+
+      formData.put("cancel_at", this.cancelAt);
+    }
+
+    if (this.creditOptionForCurrentTermCharges != null) {
+
+      formData.put(
+          "credit_option_for_current_term_charges", this.creditOptionForCurrentTermCharges);
+    }
+
+    if (this.unbilledChargesOption != null) {
+
+      formData.put("unbilled_charges_option", this.unbilledChargesOption);
+    }
+
+    if (this.accountReceivablesHandling != null) {
+
+      formData.put("account_receivables_handling", this.accountReceivablesHandling);
+    }
+
+    if (this.refundableCreditsHandling != null) {
+
+      formData.put("refundable_credits_handling", this.refundableCreditsHandling);
+    }
+
+    if (this.contractTermCancelOption != null) {
+
+      formData.put("contract_term_cancel_option", this.contractTermCancelOption);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.cancelReasonCode != null) {
+
+      formData.put("cancel_reason_code", this.cancelReasonCode);
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionCancelParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionCancelBuilder builder() {
+    return new SubscriptionCancelBuilder();
+  }
+
+  public static final class SubscriptionCancelBuilder {
+
+    private CancelOption cancelOption;
+
+    private Boolean endOfTerm;
+
+    private Timestamp cancelAt;
+
+    private CreditOptionForCurrentTermCharges creditOptionForCurrentTermCharges;
+
+    private UnbilledChargesOption unbilledChargesOption;
+
+    private AccountReceivablesHandling accountReceivablesHandling;
+
+    private RefundableCreditsHandling refundableCreditsHandling;
+
+    private ContractTermCancelOption contractTermCancelOption;
+
+    private Timestamp invoiceDate;
+
+    private String cancelReasonCode;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private SubscriptionCancelBuilder() {}
+
+    public SubscriptionCancelBuilder cancelOption(CancelOption value) {
+      this.cancelOption = value;
+      return this;
+    }
+
+    public SubscriptionCancelBuilder endOfTerm(Boolean value) {
+      this.endOfTerm = value;
+      return this;
+    }
+
+    public SubscriptionCancelBuilder cancelAt(Timestamp value) {
+      this.cancelAt = value;
+      return this;
+    }
+
+    public SubscriptionCancelBuilder creditOptionForCurrentTermCharges(
+        CreditOptionForCurrentTermCharges value) {
+      this.creditOptionForCurrentTermCharges = value;
+      return this;
+    }
+
+    public SubscriptionCancelBuilder unbilledChargesOption(UnbilledChargesOption value) {
+      this.unbilledChargesOption = value;
+      return this;
+    }
+
+    public SubscriptionCancelBuilder accountReceivablesHandling(AccountReceivablesHandling value) {
+      this.accountReceivablesHandling = value;
+      return this;
+    }
+
+    public SubscriptionCancelBuilder refundableCreditsHandling(RefundableCreditsHandling value) {
+      this.refundableCreditsHandling = value;
+      return this;
+    }
+
+    public SubscriptionCancelBuilder contractTermCancelOption(ContractTermCancelOption value) {
+      this.contractTermCancelOption = value;
+      return this;
+    }
+
+    public SubscriptionCancelBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public SubscriptionCancelBuilder cancelReasonCode(String value) {
+      this.cancelReasonCode = value;
+      return this;
+    }
+
+    public SubscriptionCancelBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public SubscriptionCancelParams build() {
+      return new SubscriptionCancelParams(this);
+    }
+  }
+
+  public enum CancelOption {
+    IMMEDIATELY("immediately"),
+
+    END_OF_TERM("end_of_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    END_OF_BILLING_TERM("end_of_billing_term"),
+
+    /** An enum member indicating that CancelOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    CancelOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CancelOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CancelOption enumValue : CancelOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum CreditOptionForCurrentTermCharges {
+    NONE("none"),
+
+    PRORATE("prorate"),
+
+    FULL("full"),
+
+    /**
+     * An enum member indicating that CreditOptionForCurrentTermCharges was instantiated with an
+     * unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    CreditOptionForCurrentTermCharges(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static CreditOptionForCurrentTermCharges fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (CreditOptionForCurrentTermCharges enumValue :
+          CreditOptionForCurrentTermCharges.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum UnbilledChargesOption {
+    INVOICE("invoice"),
+
+    DELETE("delete"),
+
+    /**
+     * An enum member indicating that UnbilledChargesOption was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    UnbilledChargesOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static UnbilledChargesOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (UnbilledChargesOption enumValue : UnbilledChargesOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AccountReceivablesHandling {
+    NO_ACTION("no_action"),
+
+    SCHEDULE_PAYMENT_COLLECTION("schedule_payment_collection"),
+
+    WRITE_OFF("write_off"),
+
+    /**
+     * An enum member indicating that AccountReceivablesHandling was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    AccountReceivablesHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AccountReceivablesHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AccountReceivablesHandling enumValue : AccountReceivablesHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum RefundableCreditsHandling {
+    NO_ACTION("no_action"),
+
+    SCHEDULE_REFUND("schedule_refund"),
+
+    /**
+     * An enum member indicating that RefundableCreditsHandling was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    RefundableCreditsHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static RefundableCreditsHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (RefundableCreditsHandling enumValue : RefundableCreditsHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ContractTermCancelOption {
+    TERMINATE_IMMEDIATELY("terminate_immediately"),
+
+    END_OF_CONTRACT_TERM("end_of_contract_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    END_OF_SUBSCRIPTION_BILLING_TERM("end_of_subscription_billing_term"),
+
+    /**
+     * An enum member indicating that ContractTermCancelOption was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    ContractTermCancelOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ContractTermCancelOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ContractTermCancelOption enumValue : ContractTermCancelOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final Integer servicePeriodInDays;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private Integer servicePeriodInDays;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionChangeTermEndParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionChangeTermEndParams.java
new file mode 100644
index 00000000..f3ef252a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionChangeTermEndParams.java
@@ -0,0 +1,101 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class SubscriptionChangeTermEndParams {
+
+  private final Timestamp termEndsAt;
+
+  private final Boolean prorate;
+
+  private final Boolean invoiceImmediately;
+
+  private SubscriptionChangeTermEndParams(SubscriptionChangeTermEndBuilder builder) {
+
+    this.termEndsAt = builder.termEndsAt;
+
+    this.prorate = builder.prorate;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+  }
+
+  public Timestamp getTermEndsAt() {
+    return termEndsAt;
+  }
+
+  public Boolean getProrate() {
+    return prorate;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.termEndsAt != null) {
+
+      formData.put("term_ends_at", this.termEndsAt);
+    }
+
+    if (this.prorate != null) {
+
+      formData.put("prorate", this.prorate);
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionChangeTermEndParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionChangeTermEndBuilder builder() {
+    return new SubscriptionChangeTermEndBuilder();
+  }
+
+  public static final class SubscriptionChangeTermEndBuilder {
+
+    private Timestamp termEndsAt;
+
+    private Boolean prorate;
+
+    private Boolean invoiceImmediately;
+
+    private SubscriptionChangeTermEndBuilder() {}
+
+    public SubscriptionChangeTermEndBuilder termEndsAt(Timestamp value) {
+      this.termEndsAt = value;
+      return this;
+    }
+
+    public SubscriptionChangeTermEndBuilder prorate(Boolean value) {
+      this.prorate = value;
+      return this;
+    }
+
+    public SubscriptionChangeTermEndBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public SubscriptionChangeTermEndParams build() {
+      return new SubscriptionChangeTermEndParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionChargeAddonAtTermEndParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionChargeAddonAtTermEndParams.java
new file mode 100644
index 00000000..de9dd9d4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionChargeAddonAtTermEndParams.java
@@ -0,0 +1,181 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class SubscriptionChargeAddonAtTermEndParams {
+
+  private final String addonId;
+
+  private final Integer addonQuantity;
+
+  private final Long addonUnitPrice;
+
+  private final String addonQuantityInDecimal;
+
+  private final String addonUnitPriceInDecimal;
+
+  private final Timestamp dateFrom;
+
+  private final Timestamp dateTo;
+
+  private SubscriptionChargeAddonAtTermEndParams(SubscriptionChargeAddonAtTermEndBuilder builder) {
+
+    this.addonId = builder.addonId;
+
+    this.addonQuantity = builder.addonQuantity;
+
+    this.addonUnitPrice = builder.addonUnitPrice;
+
+    this.addonQuantityInDecimal = builder.addonQuantityInDecimal;
+
+    this.addonUnitPriceInDecimal = builder.addonUnitPriceInDecimal;
+
+    this.dateFrom = builder.dateFrom;
+
+    this.dateTo = builder.dateTo;
+  }
+
+  public String getAddonId() {
+    return addonId;
+  }
+
+  public Integer getAddonQuantity() {
+    return addonQuantity;
+  }
+
+  public Long getAddonUnitPrice() {
+    return addonUnitPrice;
+  }
+
+  public String getAddonQuantityInDecimal() {
+    return addonQuantityInDecimal;
+  }
+
+  public String getAddonUnitPriceInDecimal() {
+    return addonUnitPriceInDecimal;
+  }
+
+  public Timestamp getDateFrom() {
+    return dateFrom;
+  }
+
+  public Timestamp getDateTo() {
+    return dateTo;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.addonId != null) {
+
+      formData.put("addon_id", this.addonId);
+    }
+
+    if (this.addonQuantity != null) {
+
+      formData.put("addon_quantity", this.addonQuantity);
+    }
+
+    if (this.addonUnitPrice != null) {
+
+      formData.put("addon_unit_price", this.addonUnitPrice);
+    }
+
+    if (this.addonQuantityInDecimal != null) {
+
+      formData.put("addon_quantity_in_decimal", this.addonQuantityInDecimal);
+    }
+
+    if (this.addonUnitPriceInDecimal != null) {
+
+      formData.put("addon_unit_price_in_decimal", this.addonUnitPriceInDecimal);
+    }
+
+    if (this.dateFrom != null) {
+
+      formData.put("date_from", this.dateFrom);
+    }
+
+    if (this.dateTo != null) {
+
+      formData.put("date_to", this.dateTo);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionChargeAddonAtTermEndParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionChargeAddonAtTermEndBuilder builder() {
+    return new SubscriptionChargeAddonAtTermEndBuilder();
+  }
+
+  public static final class SubscriptionChargeAddonAtTermEndBuilder {
+
+    private String addonId;
+
+    private Integer addonQuantity;
+
+    private Long addonUnitPrice;
+
+    private String addonQuantityInDecimal;
+
+    private String addonUnitPriceInDecimal;
+
+    private Timestamp dateFrom;
+
+    private Timestamp dateTo;
+
+    private SubscriptionChargeAddonAtTermEndBuilder() {}
+
+    public SubscriptionChargeAddonAtTermEndBuilder addonId(String value) {
+      this.addonId = value;
+      return this;
+    }
+
+    public SubscriptionChargeAddonAtTermEndBuilder addonQuantity(Integer value) {
+      this.addonQuantity = value;
+      return this;
+    }
+
+    public SubscriptionChargeAddonAtTermEndBuilder addonUnitPrice(Long value) {
+      this.addonUnitPrice = value;
+      return this;
+    }
+
+    public SubscriptionChargeAddonAtTermEndBuilder addonQuantityInDecimal(String value) {
+      this.addonQuantityInDecimal = value;
+      return this;
+    }
+
+    public SubscriptionChargeAddonAtTermEndBuilder addonUnitPriceInDecimal(String value) {
+      this.addonUnitPriceInDecimal = value;
+      return this;
+    }
+
+    public SubscriptionChargeAddonAtTermEndBuilder dateFrom(Timestamp value) {
+      this.dateFrom = value;
+      return this;
+    }
+
+    public SubscriptionChargeAddonAtTermEndBuilder dateTo(Timestamp value) {
+      this.dateTo = value;
+      return this;
+    }
+
+    public SubscriptionChargeAddonAtTermEndParams build() {
+      return new SubscriptionChargeAddonAtTermEndParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionChargeFutureRenewalsParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionChargeFutureRenewalsParams.java
new file mode 100644
index 00000000..19b281c1
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionChargeFutureRenewalsParams.java
@@ -0,0 +1,395 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class SubscriptionChargeFutureRenewalsParams {
+
+  private final Integer termsToCharge;
+
+  private final Boolean invoiceImmediately;
+
+  private final ScheduleType scheduleType;
+
+  private final FixedIntervalScheduleParams fixedIntervalSchedule;
+
+  private final List<SpecificDatesScheduleParams> specificDatesSchedule;
+
+  private SubscriptionChargeFutureRenewalsParams(SubscriptionChargeFutureRenewalsBuilder builder) {
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.scheduleType = builder.scheduleType;
+
+    this.fixedIntervalSchedule = builder.fixedIntervalSchedule;
+
+    this.specificDatesSchedule = builder.specificDatesSchedule;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public ScheduleType getScheduleType() {
+    return scheduleType;
+  }
+
+  public FixedIntervalScheduleParams getFixedIntervalSchedule() {
+    return fixedIntervalSchedule;
+  }
+
+  public List<SpecificDatesScheduleParams> getSpecificDatesSchedule() {
+    return specificDatesSchedule;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.scheduleType != null) {
+
+      formData.put("schedule_type", this.scheduleType);
+    }
+
+    if (this.fixedIntervalSchedule != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.fixedIntervalSchedule.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "fixed_interval_schedule[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.specificDatesSchedule != null) {
+
+      // List of objects
+      for (int i = 0; i < this.specificDatesSchedule.size(); i++) {
+        SpecificDatesScheduleParams item = this.specificDatesSchedule.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "specific_dates_schedule[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionChargeFutureRenewalsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionChargeFutureRenewalsBuilder builder() {
+    return new SubscriptionChargeFutureRenewalsBuilder();
+  }
+
+  public static final class SubscriptionChargeFutureRenewalsBuilder {
+
+    private Integer termsToCharge;
+
+    private Boolean invoiceImmediately;
+
+    private ScheduleType scheduleType;
+
+    private FixedIntervalScheduleParams fixedIntervalSchedule;
+
+    private List<SpecificDatesScheduleParams> specificDatesSchedule;
+
+    private SubscriptionChargeFutureRenewalsBuilder() {}
+
+    public SubscriptionChargeFutureRenewalsBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public SubscriptionChargeFutureRenewalsBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public SubscriptionChargeFutureRenewalsBuilder scheduleType(ScheduleType value) {
+      this.scheduleType = value;
+      return this;
+    }
+
+    public SubscriptionChargeFutureRenewalsBuilder fixedIntervalSchedule(
+        FixedIntervalScheduleParams value) {
+      this.fixedIntervalSchedule = value;
+      return this;
+    }
+
+    public SubscriptionChargeFutureRenewalsBuilder specificDatesSchedule(
+        List<SpecificDatesScheduleParams> value) {
+      this.specificDatesSchedule = value;
+      return this;
+    }
+
+    public SubscriptionChargeFutureRenewalsParams build() {
+      return new SubscriptionChargeFutureRenewalsParams(this);
+    }
+  }
+
+  public enum ScheduleType {
+    IMMEDIATE("immediate"),
+
+    SPECIFIC_DATES("specific_dates"),
+
+    FIXED_INTERVALS("fixed_intervals"),
+
+    /** An enum member indicating that ScheduleType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ScheduleType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ScheduleType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ScheduleType enumValue : ScheduleType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class FixedIntervalScheduleParams {
+
+    private final Integer numberOfOccurrences;
+
+    private final Integer daysBeforeRenewal;
+
+    private final EndScheduleOn endScheduleOn;
+
+    private final Timestamp endDate;
+
+    private FixedIntervalScheduleParams(FixedIntervalScheduleBuilder builder) {
+
+      this.numberOfOccurrences = builder.numberOfOccurrences;
+
+      this.daysBeforeRenewal = builder.daysBeforeRenewal;
+
+      this.endScheduleOn = builder.endScheduleOn;
+
+      this.endDate = builder.endDate;
+    }
+
+    public Integer getNumberOfOccurrences() {
+      return numberOfOccurrences;
+    }
+
+    public Integer getDaysBeforeRenewal() {
+      return daysBeforeRenewal;
+    }
+
+    public EndScheduleOn getEndScheduleOn() {
+      return endScheduleOn;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.numberOfOccurrences != null) {
+
+        formData.put("number_of_occurrences", this.numberOfOccurrences);
+      }
+
+      if (this.daysBeforeRenewal != null) {
+
+        formData.put("days_before_renewal", this.daysBeforeRenewal);
+      }
+
+      if (this.endScheduleOn != null) {
+
+        formData.put("end_schedule_on", this.endScheduleOn);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for FixedIntervalScheduleParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static FixedIntervalScheduleBuilder builder() {
+      return new FixedIntervalScheduleBuilder();
+    }
+
+    public static final class FixedIntervalScheduleBuilder {
+
+      private Integer numberOfOccurrences;
+
+      private Integer daysBeforeRenewal;
+
+      private EndScheduleOn endScheduleOn;
+
+      private Timestamp endDate;
+
+      private FixedIntervalScheduleBuilder() {}
+
+      public FixedIntervalScheduleBuilder numberOfOccurrences(Integer value) {
+        this.numberOfOccurrences = value;
+        return this;
+      }
+
+      public FixedIntervalScheduleBuilder daysBeforeRenewal(Integer value) {
+        this.daysBeforeRenewal = value;
+        return this;
+      }
+
+      public FixedIntervalScheduleBuilder endScheduleOn(EndScheduleOn value) {
+        this.endScheduleOn = value;
+        return this;
+      }
+
+      public FixedIntervalScheduleBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public FixedIntervalScheduleParams build() {
+        return new FixedIntervalScheduleParams(this);
+      }
+    }
+
+    public enum EndScheduleOn {
+      AFTER_NUMBER_OF_INTERVALS("after_number_of_intervals"),
+
+      SPECIFIC_DATE("specific_date"),
+
+      SUBSCRIPTION_END("subscription_end"),
+
+      /** An enum member indicating that EndScheduleOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EndScheduleOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EndScheduleOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EndScheduleOn enumValue : EndScheduleOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SpecificDatesScheduleParams {
+
+    private final Integer termsToCharge;
+
+    private final Timestamp date;
+
+    private SpecificDatesScheduleParams(SpecificDatesScheduleBuilder builder) {
+
+      this.termsToCharge = builder.termsToCharge;
+
+      this.date = builder.date;
+    }
+
+    public Integer getTermsToCharge() {
+      return termsToCharge;
+    }
+
+    public Timestamp getDate() {
+      return date;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.termsToCharge != null) {
+
+        formData.put("terms_to_charge", this.termsToCharge);
+      }
+
+      if (this.date != null) {
+
+        formData.put("date", this.date);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SpecificDatesScheduleParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SpecificDatesScheduleBuilder builder() {
+      return new SpecificDatesScheduleBuilder();
+    }
+
+    public static final class SpecificDatesScheduleBuilder {
+
+      private Integer termsToCharge;
+
+      private Timestamp date;
+
+      private SpecificDatesScheduleBuilder() {}
+
+      public SpecificDatesScheduleBuilder termsToCharge(Integer value) {
+        this.termsToCharge = value;
+        return this;
+      }
+
+      public SpecificDatesScheduleBuilder date(Timestamp value) {
+        this.date = value;
+        return this;
+      }
+
+      public SpecificDatesScheduleParams build() {
+        return new SpecificDatesScheduleParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCreateForCustomerParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCreateForCustomerParams.java
new file mode 100644
index 00000000..a6afa4ab
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCreateForCustomerParams.java
@@ -0,0 +1,2331 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class SubscriptionCreateForCustomerParams {
+
+  private final String id;
+
+  private final String planId;
+
+  private final Integer planQuantity;
+
+  private final String planQuantityInDecimal;
+
+  private final Long planUnitPrice;
+
+  private final String planUnitPriceInDecimal;
+
+  private final Long setupFee;
+
+  private final Timestamp trialEnd;
+
+  private final Integer billingCycles;
+
+  private final List<String> mandatoryAddonsToRemove;
+
+  private final Timestamp startDate;
+
+  private final String coupon;
+
+  private final AutoCollection autoCollection;
+
+  private final Integer termsToCharge;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final OfflinePaymentMethod offlinePaymentMethod;
+
+  private final String poNumber;
+
+  private final List<String> couponIds;
+
+  private final String paymentSourceId;
+
+  private final Boolean overrideRelationship;
+
+  private final String invoiceNotes;
+
+  private final Timestamp invoiceDate;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final Boolean invoiceImmediately;
+
+  private final Boolean replacePrimaryPaymentSource;
+
+  private final Integer freePeriod;
+
+  private final FreePeriodUnit freePeriodUnit;
+
+  private final Integer contractTermBillingCycleOnRenewal;
+
+  private final TrialEndAction trialEndAction;
+
+  private final PaymentInitiator paymentInitiator;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final StatementDescriptorParams statementDescriptor;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<AddonsParams> addons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private final List<CouponsParams> coupons;
+
+  private final Map<String, String> customFields;
+
+  private SubscriptionCreateForCustomerParams(SubscriptionCreateForCustomerBuilder builder) {
+
+    this.id = builder.id;
+
+    this.planId = builder.planId;
+
+    this.planQuantity = builder.planQuantity;
+
+    this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+    this.planUnitPrice = builder.planUnitPrice;
+
+    this.planUnitPriceInDecimal = builder.planUnitPriceInDecimal;
+
+    this.setupFee = builder.setupFee;
+
+    this.trialEnd = builder.trialEnd;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.mandatoryAddonsToRemove = builder.mandatoryAddonsToRemove;
+
+    this.startDate = builder.startDate;
+
+    this.coupon = builder.coupon;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+    this.poNumber = builder.poNumber;
+
+    this.couponIds = builder.couponIds;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.overrideRelationship = builder.overrideRelationship;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.metaData = builder.metaData;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.replacePrimaryPaymentSource = builder.replacePrimaryPaymentSource;
+
+    this.freePeriod = builder.freePeriod;
+
+    this.freePeriodUnit = builder.freePeriodUnit;
+
+    this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+    this.trialEndAction = builder.trialEndAction;
+
+    this.paymentInitiator = builder.paymentInitiator;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.statementDescriptor = builder.statementDescriptor;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.addons = builder.addons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+
+    this.coupons = builder.coupons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getPlanId() {
+    return planId;
+  }
+
+  public Integer getPlanQuantity() {
+    return planQuantity;
+  }
+
+  public String getPlanQuantityInDecimal() {
+    return planQuantityInDecimal;
+  }
+
+  public Long getPlanUnitPrice() {
+    return planUnitPrice;
+  }
+
+  public String getPlanUnitPriceInDecimal() {
+    return planUnitPriceInDecimal;
+  }
+
+  public Long getSetupFee() {
+    return setupFee;
+  }
+
+  public Timestamp getTrialEnd() {
+    return trialEnd;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public List<String> getMandatoryAddonsToRemove() {
+    return mandatoryAddonsToRemove;
+  }
+
+  public Timestamp getStartDate() {
+    return startDate;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public OfflinePaymentMethod getOfflinePaymentMethod() {
+    return offlinePaymentMethod;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public Boolean getOverrideRelationship() {
+    return overrideRelationship;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public Boolean getReplacePrimaryPaymentSource() {
+    return replacePrimaryPaymentSource;
+  }
+
+  public Integer getFreePeriod() {
+    return freePeriod;
+  }
+
+  public FreePeriodUnit getFreePeriodUnit() {
+    return freePeriodUnit;
+  }
+
+  public Integer getContractTermBillingCycleOnRenewal() {
+    return contractTermBillingCycleOnRenewal;
+  }
+
+  public TrialEndAction getTrialEndAction() {
+    return trialEndAction;
+  }
+
+  public PaymentInitiator getPaymentInitiator() {
+    return paymentInitiator;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public StatementDescriptorParams getStatementDescriptor() {
+    return statementDescriptor;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  public List<CouponsParams> getCoupons() {
+    return coupons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.planId != null) {
+
+      formData.put("plan_id", this.planId);
+    }
+
+    if (this.planQuantity != null) {
+
+      formData.put("plan_quantity", this.planQuantity);
+    }
+
+    if (this.planQuantityInDecimal != null) {
+
+      formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+    }
+
+    if (this.planUnitPrice != null) {
+
+      formData.put("plan_unit_price", this.planUnitPrice);
+    }
+
+    if (this.planUnitPriceInDecimal != null) {
+
+      formData.put("plan_unit_price_in_decimal", this.planUnitPriceInDecimal);
+    }
+
+    if (this.setupFee != null) {
+
+      formData.put("setup_fee", this.setupFee);
+    }
+
+    if (this.trialEnd != null) {
+
+      formData.put("trial_end", this.trialEnd);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.mandatoryAddonsToRemove != null) {
+
+      formData.put("mandatory_addons_to_remove", this.mandatoryAddonsToRemove);
+    }
+
+    if (this.startDate != null) {
+
+      formData.put("start_date", this.startDate);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.offlinePaymentMethod != null) {
+
+      formData.put("offline_payment_method", this.offlinePaymentMethod);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.overrideRelationship != null) {
+
+      formData.put("override_relationship", this.overrideRelationship);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.replacePrimaryPaymentSource != null) {
+
+      formData.put("replace_primary_payment_source", this.replacePrimaryPaymentSource);
+    }
+
+    if (this.freePeriod != null) {
+
+      formData.put("free_period", this.freePeriod);
+    }
+
+    if (this.freePeriodUnit != null) {
+
+      formData.put("free_period_unit", this.freePeriodUnit);
+    }
+
+    if (this.contractTermBillingCycleOnRenewal != null) {
+
+      formData.put(
+          "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+    }
+
+    if (this.trialEndAction != null) {
+
+      formData.put("trial_end_action", this.trialEndAction);
+    }
+
+    if (this.paymentInitiator != null) {
+
+      formData.put("payment_initiator", this.paymentInitiator);
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.statementDescriptor != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.statementDescriptor.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.coupons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.coupons.size(); i++) {
+        CouponsParams item = this.coupons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionCreateForCustomerParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionCreateForCustomerBuilder builder() {
+    return new SubscriptionCreateForCustomerBuilder();
+  }
+
+  public static final class SubscriptionCreateForCustomerBuilder {
+
+    private String id;
+
+    private String planId;
+
+    private Integer planQuantity;
+
+    private String planQuantityInDecimal;
+
+    private Long planUnitPrice;
+
+    private String planUnitPriceInDecimal;
+
+    private Long setupFee;
+
+    private Timestamp trialEnd;
+
+    private Integer billingCycles;
+
+    private List<String> mandatoryAddonsToRemove;
+
+    private Timestamp startDate;
+
+    private String coupon;
+
+    private AutoCollection autoCollection;
+
+    private Integer termsToCharge;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private OfflinePaymentMethod offlinePaymentMethod;
+
+    private String poNumber;
+
+    private List<String> couponIds;
+
+    private String paymentSourceId;
+
+    private Boolean overrideRelationship;
+
+    private String invoiceNotes;
+
+    private Timestamp invoiceDate;
+
+    private java.util.Map<String, Object> metaData;
+
+    private Boolean invoiceImmediately;
+
+    private Boolean replacePrimaryPaymentSource;
+
+    private Integer freePeriod;
+
+    private FreePeriodUnit freePeriodUnit;
+
+    private Integer contractTermBillingCycleOnRenewal;
+
+    private TrialEndAction trialEndAction;
+
+    private PaymentInitiator paymentInitiator;
+
+    private ShippingAddressParams shippingAddress;
+
+    private StatementDescriptorParams statementDescriptor;
+
+    private PaymentIntentParams paymentIntent;
+
+    private ContractTermParams contractTerm;
+
+    private List<AddonsParams> addons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private List<CouponsParams> coupons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private SubscriptionCreateForCustomerBuilder() {}
+
+    public SubscriptionCreateForCustomerBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder planId(String value) {
+      this.planId = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder planQuantity(Integer value) {
+      this.planQuantity = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder planQuantityInDecimal(String value) {
+      this.planQuantityInDecimal = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder planUnitPrice(Long value) {
+      this.planUnitPrice = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder planUnitPriceInDecimal(String value) {
+      this.planUnitPriceInDecimal = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder setupFee(Long value) {
+      this.setupFee = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder trialEnd(Timestamp value) {
+      this.trialEnd = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder mandatoryAddonsToRemove(List<String> value) {
+      this.mandatoryAddonsToRemove = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder startDate(Timestamp value) {
+      this.startDate = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionCreateForCustomerBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+      this.offlinePaymentMethod = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder overrideRelationship(Boolean value) {
+      this.overrideRelationship = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder replacePrimaryPaymentSource(Boolean value) {
+      this.replacePrimaryPaymentSource = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder freePeriod(Integer value) {
+      this.freePeriod = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder freePeriodUnit(FreePeriodUnit value) {
+      this.freePeriodUnit = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder contractTermBillingCycleOnRenewal(Integer value) {
+      this.contractTermBillingCycleOnRenewal = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder trialEndAction(TrialEndAction value) {
+      this.trialEndAction = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder paymentInitiator(PaymentInitiator value) {
+      this.paymentInitiator = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder statementDescriptor(
+        StatementDescriptorParams value) {
+      this.statementDescriptor = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerBuilder eventBasedAddons(
+        List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionCreateForCustomerBuilder coupons(List<CouponsParams> value) {
+      this.coupons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public SubscriptionCreateForCustomerBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public SubscriptionCreateForCustomerBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public SubscriptionCreateForCustomerParams build() {
+      return new SubscriptionCreateForCustomerParams(this);
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum OfflinePaymentMethod {
+    NO_PREFERENCE("no_preference"),
+
+    CASH("cash"),
+
+    CHECK("check"),
+
+    BANK_TRANSFER("bank_transfer"),
+
+    ACH_CREDIT("ach_credit"),
+
+    SEPA_CREDIT("sepa_credit"),
+
+    BOLETO("boleto"),
+
+    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+    CUSTOM("custom"),
+
+    /**
+     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    OfflinePaymentMethod(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static OfflinePaymentMethod fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum FreePeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    FreePeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static FreePeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TrialEndAction {
+    SITE_DEFAULT("site_default"),
+
+    PLAN_DEFAULT("plan_default"),
+
+    ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+    CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TrialEndAction(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TrialEndAction fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TrialEndAction enumValue : TrialEndAction.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PaymentInitiator {
+    CUSTOMER("customer"),
+
+    MERCHANT("merchant"),
+
+    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentInitiator(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentInitiator fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatementDescriptorParams {
+
+    private final String descriptor;
+
+    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
+
+      this.descriptor = builder.descriptor;
+    }
+
+    public String getDescriptor() {
+      return descriptor;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.descriptor != null) {
+
+        formData.put("descriptor", this.descriptor);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatementDescriptorParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatementDescriptorBuilder builder() {
+      return new StatementDescriptorBuilder();
+    }
+
+    public static final class StatementDescriptorBuilder {
+
+      private String descriptor;
+
+      private StatementDescriptorBuilder() {}
+
+      public StatementDescriptorBuilder descriptor(String value) {
+        this.descriptor = value;
+        return this;
+      }
+
+      public StatementDescriptorParams build() {
+        return new StatementDescriptorParams(this);
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AddonsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriodInDays;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOn chargeOn;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOn = builder.chargeOn;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOn getChargeOn() {
+      return chargeOn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOn != null) {
+
+        formData.put("charge_on", this.chargeOn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriodInDays;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOn chargeOn;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
+        this.chargeOn = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOn {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOn enumValue : ChargeOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponsParams {
+
+    private final String couponId;
+
+    private final Timestamp applyTill;
+
+    private CouponsParams(CouponsBuilder builder) {
+
+      this.couponId = builder.couponId;
+
+      this.applyTill = builder.applyTill;
+    }
+
+    public String getCouponId() {
+      return couponId;
+    }
+
+    public Timestamp getApplyTill() {
+      return applyTill;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.couponId != null) {
+
+        formData.put("coupon_id", this.couponId);
+      }
+
+      if (this.applyTill != null) {
+
+        formData.put("apply_till", this.applyTill);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsBuilder builder() {
+      return new CouponsBuilder();
+    }
+
+    public static final class CouponsBuilder {
+
+      private String couponId;
+
+      private Timestamp applyTill;
+
+      private CouponsBuilder() {}
+
+      public CouponsBuilder couponId(String value) {
+        this.couponId = value;
+        return this;
+      }
+
+      public CouponsBuilder applyTill(Timestamp value) {
+        this.applyTill = value;
+        return this;
+      }
+
+      public CouponsParams build() {
+        return new CouponsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCreateParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCreateParams.java
new file mode 100644
index 00000000..1caaf068
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCreateParams.java
@@ -0,0 +1,5306 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class SubscriptionCreateParams {
+
+  private final String id;
+
+  private final String planId;
+
+  private final Integer planQuantity;
+
+  private final String planQuantityInDecimal;
+
+  private final Long planUnitPrice;
+
+  private final String planUnitPriceInDecimal;
+
+  private final Long setupFee;
+
+  private final Timestamp trialEnd;
+
+  private final Integer billingCycles;
+
+  private final List<String> mandatoryAddonsToRemove;
+
+  private final Timestamp startDate;
+
+  private final String coupon;
+
+  private final AutoCollection autoCollection;
+
+  private final Integer termsToCharge;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final OfflinePaymentMethod offlinePaymentMethod;
+
+  private final String poNumber;
+
+  private final List<String> couponIds;
+
+  private final String tokenId;
+
+  private final String affiliateToken;
+
+  private final String createdFromIp;
+
+  private final String invoiceNotes;
+
+  private final Timestamp invoiceDate;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final Boolean invoiceImmediately;
+
+  private final Integer freePeriod;
+
+  private final FreePeriodUnit freePeriodUnit;
+
+  private final Integer contractTermBillingCycleOnRenewal;
+
+  private final TrialEndAction trialEndAction;
+
+  private final String clientProfileId;
+
+  private final PaymentInitiator paymentInitiator;
+
+  private final CustomerParams customer;
+
+  private final CardParams card;
+
+  private final BankAccountParams bankAccount;
+
+  private final PaymentMethodParams paymentMethod;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final StatementDescriptorParams statementDescriptor;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<EntityIdentifiersParams> entityIdentifiers;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private final List<AddonsParams> addons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private final List<CouponsParams> coupons;
+
+  private final Map<String, String> customFields;
+
+  private SubscriptionCreateParams(SubscriptionCreateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.planId = builder.planId;
+
+    this.planQuantity = builder.planQuantity;
+
+    this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+    this.planUnitPrice = builder.planUnitPrice;
+
+    this.planUnitPriceInDecimal = builder.planUnitPriceInDecimal;
+
+    this.setupFee = builder.setupFee;
+
+    this.trialEnd = builder.trialEnd;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.mandatoryAddonsToRemove = builder.mandatoryAddonsToRemove;
+
+    this.startDate = builder.startDate;
+
+    this.coupon = builder.coupon;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+    this.poNumber = builder.poNumber;
+
+    this.couponIds = builder.couponIds;
+
+    this.tokenId = builder.tokenId;
+
+    this.affiliateToken = builder.affiliateToken;
+
+    this.createdFromIp = builder.createdFromIp;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.metaData = builder.metaData;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.freePeriod = builder.freePeriod;
+
+    this.freePeriodUnit = builder.freePeriodUnit;
+
+    this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+    this.trialEndAction = builder.trialEndAction;
+
+    this.clientProfileId = builder.clientProfileId;
+
+    this.paymentInitiator = builder.paymentInitiator;
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+
+    this.bankAccount = builder.bankAccount;
+
+    this.paymentMethod = builder.paymentMethod;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.statementDescriptor = builder.statementDescriptor;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.entityIdentifiers = builder.entityIdentifiers;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+
+    this.addons = builder.addons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+
+    this.coupons = builder.coupons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getPlanId() {
+    return planId;
+  }
+
+  public Integer getPlanQuantity() {
+    return planQuantity;
+  }
+
+  public String getPlanQuantityInDecimal() {
+    return planQuantityInDecimal;
+  }
+
+  public Long getPlanUnitPrice() {
+    return planUnitPrice;
+  }
+
+  public String getPlanUnitPriceInDecimal() {
+    return planUnitPriceInDecimal;
+  }
+
+  public Long getSetupFee() {
+    return setupFee;
+  }
+
+  public Timestamp getTrialEnd() {
+    return trialEnd;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public List<String> getMandatoryAddonsToRemove() {
+    return mandatoryAddonsToRemove;
+  }
+
+  public Timestamp getStartDate() {
+    return startDate;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public OfflinePaymentMethod getOfflinePaymentMethod() {
+    return offlinePaymentMethod;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getTokenId() {
+    return tokenId;
+  }
+
+  public String getAffiliateToken() {
+    return affiliateToken;
+  }
+
+  public String getCreatedFromIp() {
+    return createdFromIp;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public Integer getFreePeriod() {
+    return freePeriod;
+  }
+
+  public FreePeriodUnit getFreePeriodUnit() {
+    return freePeriodUnit;
+  }
+
+  public Integer getContractTermBillingCycleOnRenewal() {
+    return contractTermBillingCycleOnRenewal;
+  }
+
+  public TrialEndAction getTrialEndAction() {
+    return trialEndAction;
+  }
+
+  public String getClientProfileId() {
+    return clientProfileId;
+  }
+
+  public PaymentInitiator getPaymentInitiator() {
+    return paymentInitiator;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public BankAccountParams getBankAccount() {
+    return bankAccount;
+  }
+
+  public PaymentMethodParams getPaymentMethod() {
+    return paymentMethod;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public StatementDescriptorParams getStatementDescriptor() {
+    return statementDescriptor;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<EntityIdentifiersParams> getEntityIdentifiers() {
+    return entityIdentifiers;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  public List<CouponsParams> getCoupons() {
+    return coupons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.planId != null) {
+
+      formData.put("plan_id", this.planId);
+    }
+
+    if (this.planQuantity != null) {
+
+      formData.put("plan_quantity", this.planQuantity);
+    }
+
+    if (this.planQuantityInDecimal != null) {
+
+      formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+    }
+
+    if (this.planUnitPrice != null) {
+
+      formData.put("plan_unit_price", this.planUnitPrice);
+    }
+
+    if (this.planUnitPriceInDecimal != null) {
+
+      formData.put("plan_unit_price_in_decimal", this.planUnitPriceInDecimal);
+    }
+
+    if (this.setupFee != null) {
+
+      formData.put("setup_fee", this.setupFee);
+    }
+
+    if (this.trialEnd != null) {
+
+      formData.put("trial_end", this.trialEnd);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.mandatoryAddonsToRemove != null) {
+
+      formData.put("mandatory_addons_to_remove", this.mandatoryAddonsToRemove);
+    }
+
+    if (this.startDate != null) {
+
+      formData.put("start_date", this.startDate);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.offlinePaymentMethod != null) {
+
+      formData.put("offline_payment_method", this.offlinePaymentMethod);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.tokenId != null) {
+
+      formData.put("token_id", this.tokenId);
+    }
+
+    if (this.affiliateToken != null) {
+
+      formData.put("affiliate_token", this.affiliateToken);
+    }
+
+    if (this.createdFromIp != null) {
+
+      formData.put("created_from_ip", this.createdFromIp);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.freePeriod != null) {
+
+      formData.put("free_period", this.freePeriod);
+    }
+
+    if (this.freePeriodUnit != null) {
+
+      formData.put("free_period_unit", this.freePeriodUnit);
+    }
+
+    if (this.contractTermBillingCycleOnRenewal != null) {
+
+      formData.put(
+          "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+    }
+
+    if (this.trialEndAction != null) {
+
+      formData.put("trial_end_action", this.trialEndAction);
+    }
+
+    if (this.clientProfileId != null) {
+
+      formData.put("client_profile_id", this.clientProfileId);
+    }
+
+    if (this.paymentInitiator != null) {
+
+      formData.put("payment_initiator", this.paymentInitiator);
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.bankAccount != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.bankAccount.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "bank_account[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentMethod != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentMethod.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_method[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.statementDescriptor != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.statementDescriptor.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.entityIdentifiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.entityIdentifiers.size(); i++) {
+        EntityIdentifiersParams item = this.entityIdentifiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "entity_identifiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.coupons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.coupons.size(); i++) {
+        CouponsParams item = this.coupons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionCreateBuilder builder() {
+    return new SubscriptionCreateBuilder();
+  }
+
+  public static final class SubscriptionCreateBuilder {
+
+    private String id;
+
+    private String planId;
+
+    private Integer planQuantity;
+
+    private String planQuantityInDecimal;
+
+    private Long planUnitPrice;
+
+    private String planUnitPriceInDecimal;
+
+    private Long setupFee;
+
+    private Timestamp trialEnd;
+
+    private Integer billingCycles;
+
+    private List<String> mandatoryAddonsToRemove;
+
+    private Timestamp startDate;
+
+    private String coupon;
+
+    private AutoCollection autoCollection;
+
+    private Integer termsToCharge;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private OfflinePaymentMethod offlinePaymentMethod;
+
+    private String poNumber;
+
+    private List<String> couponIds;
+
+    private String tokenId;
+
+    private String affiliateToken;
+
+    private String createdFromIp;
+
+    private String invoiceNotes;
+
+    private Timestamp invoiceDate;
+
+    private java.util.Map<String, Object> metaData;
+
+    private Boolean invoiceImmediately;
+
+    private Integer freePeriod;
+
+    private FreePeriodUnit freePeriodUnit;
+
+    private Integer contractTermBillingCycleOnRenewal;
+
+    private TrialEndAction trialEndAction;
+
+    private String clientProfileId;
+
+    private PaymentInitiator paymentInitiator;
+
+    private CustomerParams customer;
+
+    private CardParams card;
+
+    private BankAccountParams bankAccount;
+
+    private PaymentMethodParams paymentMethod;
+
+    private PaymentIntentParams paymentIntent;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private StatementDescriptorParams statementDescriptor;
+
+    private ContractTermParams contractTerm;
+
+    private List<EntityIdentifiersParams> entityIdentifiers;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private List<AddonsParams> addons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private List<CouponsParams> coupons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private SubscriptionCreateBuilder() {}
+
+    public SubscriptionCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder planId(String value) {
+      this.planId = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder planQuantity(Integer value) {
+      this.planQuantity = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder planQuantityInDecimal(String value) {
+      this.planQuantityInDecimal = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder planUnitPrice(Long value) {
+      this.planUnitPrice = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder planUnitPriceInDecimal(String value) {
+      this.planUnitPriceInDecimal = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder setupFee(Long value) {
+      this.setupFee = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder trialEnd(Timestamp value) {
+      this.trialEnd = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder mandatoryAddonsToRemove(List<String> value) {
+      this.mandatoryAddonsToRemove = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder startDate(Timestamp value) {
+      this.startDate = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionCreateBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+      this.offlinePaymentMethod = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder tokenId(String value) {
+      this.tokenId = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder affiliateToken(String value) {
+      this.affiliateToken = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionCreateBuilder createdFromIp(String value) {
+      this.createdFromIp = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder freePeriod(Integer value) {
+      this.freePeriod = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder freePeriodUnit(FreePeriodUnit value) {
+      this.freePeriodUnit = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder contractTermBillingCycleOnRenewal(Integer value) {
+      this.contractTermBillingCycleOnRenewal = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder trialEndAction(TrialEndAction value) {
+      this.trialEndAction = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder clientProfileId(String value) {
+      this.clientProfileId = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder paymentInitiator(PaymentInitiator value) {
+      this.paymentInitiator = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder bankAccount(BankAccountParams value) {
+      this.bankAccount = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder paymentMethod(PaymentMethodParams value) {
+      this.paymentMethod = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder statementDescriptor(StatementDescriptorParams value) {
+      this.statementDescriptor = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder entityIdentifiers(List<EntityIdentifiersParams> value) {
+      this.entityIdentifiers = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public SubscriptionCreateBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionCreateBuilder coupons(List<CouponsParams> value) {
+      this.coupons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public SubscriptionCreateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public SubscriptionCreateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public SubscriptionCreateParams build() {
+      return new SubscriptionCreateParams(this);
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum OfflinePaymentMethod {
+    NO_PREFERENCE("no_preference"),
+
+    CASH("cash"),
+
+    CHECK("check"),
+
+    BANK_TRANSFER("bank_transfer"),
+
+    ACH_CREDIT("ach_credit"),
+
+    SEPA_CREDIT("sepa_credit"),
+
+    BOLETO("boleto"),
+
+    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+    CUSTOM("custom"),
+
+    /**
+     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    OfflinePaymentMethod(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static OfflinePaymentMethod fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum FreePeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    FreePeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static FreePeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TrialEndAction {
+    SITE_DEFAULT("site_default"),
+
+    PLAN_DEFAULT("plan_default"),
+
+    ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+    CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TrialEndAction(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TrialEndAction fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TrialEndAction enumValue : TrialEndAction.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PaymentInitiator {
+    CUSTOMER("customer"),
+
+    MERCHANT("merchant"),
+
+    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentInitiator(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentInitiator fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String id;
+
+    private final String email;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String locale;
+
+    private final Taxability taxability;
+
+    private final EntityCode entityCode;
+
+    private final String exemptNumber;
+
+    private final Integer netTermDays;
+
+    private final TaxjarExemptionCategory taxjarExemptionCategory;
+
+    private final AutoCollection autoCollection;
+
+    private final OfflinePaymentMethod offlinePaymentMethod;
+
+    private final Boolean allowDirectDebit;
+
+    private final Boolean consolidatedInvoicing;
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final String entityIdentifierScheme;
+
+    private final String entityIdentifierStandard;
+
+    private final Boolean isEinvoiceEnabled;
+
+    private final EinvoicingMethod einvoicingMethod;
+
+    private final Boolean registeredForGst;
+
+    private final Boolean businessCustomerWithoutVatNumber;
+
+    private final List<Object> exemptionDetails;
+
+    private final CustomerType customerType;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.id = builder.id;
+
+      this.email = builder.email;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.locale = builder.locale;
+
+      this.taxability = builder.taxability;
+
+      this.entityCode = builder.entityCode;
+
+      this.exemptNumber = builder.exemptNumber;
+
+      this.netTermDays = builder.netTermDays;
+
+      this.taxjarExemptionCategory = builder.taxjarExemptionCategory;
+
+      this.autoCollection = builder.autoCollection;
+
+      this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+      this.allowDirectDebit = builder.allowDirectDebit;
+
+      this.consolidatedInvoicing = builder.consolidatedInvoicing;
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.entityIdentifierScheme = builder.entityIdentifierScheme;
+
+      this.entityIdentifierStandard = builder.entityIdentifierStandard;
+
+      this.isEinvoiceEnabled = builder.isEinvoiceEnabled;
+
+      this.einvoicingMethod = builder.einvoicingMethod;
+
+      this.registeredForGst = builder.registeredForGst;
+
+      this.businessCustomerWithoutVatNumber = builder.businessCustomerWithoutVatNumber;
+
+      this.exemptionDetails = builder.exemptionDetails;
+
+      this.customerType = builder.customerType;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLocale() {
+      return locale;
+    }
+
+    public Taxability getTaxability() {
+      return taxability;
+    }
+
+    public EntityCode getEntityCode() {
+      return entityCode;
+    }
+
+    public String getExemptNumber() {
+      return exemptNumber;
+    }
+
+    public Integer getNetTermDays() {
+      return netTermDays;
+    }
+
+    public TaxjarExemptionCategory getTaxjarExemptionCategory() {
+      return taxjarExemptionCategory;
+    }
+
+    public AutoCollection getAutoCollection() {
+      return autoCollection;
+    }
+
+    public OfflinePaymentMethod getOfflinePaymentMethod() {
+      return offlinePaymentMethod;
+    }
+
+    public Boolean getAllowDirectDebit() {
+      return allowDirectDebit;
+    }
+
+    public Boolean getConsolidatedInvoicing() {
+      return consolidatedInvoicing;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public String getEntityIdentifierScheme() {
+      return entityIdentifierScheme;
+    }
+
+    public String getEntityIdentifierStandard() {
+      return entityIdentifierStandard;
+    }
+
+    public Boolean getIsEinvoiceEnabled() {
+      return isEinvoiceEnabled;
+    }
+
+    public EinvoicingMethod getEinvoicingMethod() {
+      return einvoicingMethod;
+    }
+
+    public Boolean getRegisteredForGst() {
+      return registeredForGst;
+    }
+
+    public Boolean getBusinessCustomerWithoutVatNumber() {
+      return businessCustomerWithoutVatNumber;
+    }
+
+    public List<Object> getExemptionDetails() {
+      return exemptionDetails;
+    }
+
+    public CustomerType getCustomerType() {
+      return customerType;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.locale != null) {
+
+        formData.put("locale", this.locale);
+      }
+
+      if (this.taxability != null) {
+
+        formData.put("taxability", this.taxability);
+      }
+
+      if (this.entityCode != null) {
+
+        formData.put("entity_code", this.entityCode);
+      }
+
+      if (this.exemptNumber != null) {
+
+        formData.put("exempt_number", this.exemptNumber);
+      }
+
+      if (this.netTermDays != null) {
+
+        formData.put("net_term_days", this.netTermDays);
+      }
+
+      if (this.taxjarExemptionCategory != null) {
+
+        formData.put("taxjar_exemption_category", this.taxjarExemptionCategory);
+      }
+
+      if (this.autoCollection != null) {
+
+        formData.put("auto_collection", this.autoCollection);
+      }
+
+      if (this.offlinePaymentMethod != null) {
+
+        formData.put("offline_payment_method", this.offlinePaymentMethod);
+      }
+
+      if (this.allowDirectDebit != null) {
+
+        formData.put("allow_direct_debit", this.allowDirectDebit);
+      }
+
+      if (this.consolidatedInvoicing != null) {
+
+        formData.put("consolidated_invoicing", this.consolidatedInvoicing);
+      }
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.entityIdentifierScheme != null) {
+
+        formData.put("entity_identifier_scheme", this.entityIdentifierScheme);
+      }
+
+      if (this.entityIdentifierStandard != null) {
+
+        formData.put("entity_identifier_standard", this.entityIdentifierStandard);
+      }
+
+      if (this.isEinvoiceEnabled != null) {
+
+        formData.put("is_einvoice_enabled", this.isEinvoiceEnabled);
+      }
+
+      if (this.einvoicingMethod != null) {
+
+        formData.put("einvoicing_method", this.einvoicingMethod);
+      }
+
+      if (this.registeredForGst != null) {
+
+        formData.put("registered_for_gst", this.registeredForGst);
+      }
+
+      if (this.businessCustomerWithoutVatNumber != null) {
+
+        formData.put("business_customer_without_vat_number", this.businessCustomerWithoutVatNumber);
+      }
+
+      if (this.exemptionDetails != null) {
+
+        formData.put("exemption_details", JsonUtil.toJson(this.exemptionDetails));
+      }
+
+      if (this.customerType != null) {
+
+        formData.put("customer_type", this.customerType);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String id;
+
+      private String email;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String company;
+
+      private String phone;
+
+      private String locale;
+
+      private Taxability taxability;
+
+      private EntityCode entityCode;
+
+      private String exemptNumber;
+
+      private Integer netTermDays;
+
+      private TaxjarExemptionCategory taxjarExemptionCategory;
+
+      private AutoCollection autoCollection;
+
+      private OfflinePaymentMethod offlinePaymentMethod;
+
+      private Boolean allowDirectDebit;
+
+      private Boolean consolidatedInvoicing;
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private String entityIdentifierScheme;
+
+      private String entityIdentifierStandard;
+
+      private Boolean isEinvoiceEnabled;
+
+      private EinvoicingMethod einvoicingMethod;
+
+      private Boolean registeredForGst;
+
+      private Boolean businessCustomerWithoutVatNumber;
+
+      private List<Object> exemptionDetails;
+
+      private CustomerType customerType;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public CustomerBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public CustomerBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CustomerBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CustomerBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public CustomerBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public CustomerBuilder locale(String value) {
+        this.locale = value;
+        return this;
+      }
+
+      public CustomerBuilder taxability(Taxability value) {
+        this.taxability = value;
+        return this;
+      }
+
+      public CustomerBuilder entityCode(EntityCode value) {
+        this.entityCode = value;
+        return this;
+      }
+
+      public CustomerBuilder exemptNumber(String value) {
+        this.exemptNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder netTermDays(Integer value) {
+        this.netTermDays = value;
+        return this;
+      }
+
+      public CustomerBuilder taxjarExemptionCategory(TaxjarExemptionCategory value) {
+        this.taxjarExemptionCategory = value;
+        return this;
+      }
+
+      public CustomerBuilder autoCollection(AutoCollection value) {
+        this.autoCollection = value;
+        return this;
+      }
+
+      public CustomerBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+        this.offlinePaymentMethod = value;
+        return this;
+      }
+
+      public CustomerBuilder allowDirectDebit(Boolean value) {
+        this.allowDirectDebit = value;
+        return this;
+      }
+
+      public CustomerBuilder consolidatedInvoicing(Boolean value) {
+        this.consolidatedInvoicing = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder entityIdentifierScheme(String value) {
+        this.entityIdentifierScheme = value;
+        return this;
+      }
+
+      public CustomerBuilder entityIdentifierStandard(String value) {
+        this.entityIdentifierStandard = value;
+        return this;
+      }
+
+      public CustomerBuilder isEinvoiceEnabled(Boolean value) {
+        this.isEinvoiceEnabled = value;
+        return this;
+      }
+
+      public CustomerBuilder einvoicingMethod(EinvoicingMethod value) {
+        this.einvoicingMethod = value;
+        return this;
+      }
+
+      public CustomerBuilder registeredForGst(Boolean value) {
+        this.registeredForGst = value;
+        return this;
+      }
+
+      public CustomerBuilder businessCustomerWithoutVatNumber(Boolean value) {
+        this.businessCustomerWithoutVatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder exemptionDetails(List<Object> value) {
+        this.exemptionDetails = value;
+        return this;
+      }
+
+      public CustomerBuilder customerType(CustomerType value) {
+        this.customerType = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+
+    public enum Taxability {
+      TAXABLE("taxable"),
+
+      EXEMPT("exempt"),
+
+      /** An enum member indicating that Taxability was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Taxability(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Taxability fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Taxability enumValue : Taxability.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum EntityCode {
+      A("a"),
+
+      B("b"),
+
+      C("c"),
+
+      D("d"),
+
+      E("e"),
+
+      F("f"),
+
+      G("g"),
+
+      H("h"),
+
+      I("i"),
+
+      J("j"),
+
+      K("k"),
+
+      L("l"),
+
+      M("m"),
+
+      N("n"),
+
+      P("p"),
+
+      Q("q"),
+
+      R("r"),
+
+      MED_1("med1"),
+
+      MED_2("med2"),
+
+      /** An enum member indicating that EntityCode was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityCode(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityCode fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityCode enumValue : EntityCode.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum TaxjarExemptionCategory {
+      WHOLESALE("wholesale"),
+
+      GOVERNMENT("government"),
+
+      OTHER("other"),
+
+      /**
+       * An enum member indicating that TaxjarExemptionCategory was instantiated with an unknown
+       * value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      TaxjarExemptionCategory(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static TaxjarExemptionCategory fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (TaxjarExemptionCategory enumValue : TaxjarExemptionCategory.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum AutoCollection {
+      ON("on"),
+
+      OFF("off"),
+
+      /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AutoCollection(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AutoCollection fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AutoCollection enumValue : AutoCollection.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OfflinePaymentMethod {
+      NO_PREFERENCE("no_preference"),
+
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      ACH_CREDIT("ach_credit"),
+
+      SEPA_CREDIT("sepa_credit"),
+
+      BOLETO("boleto"),
+
+      US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+      EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+      UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+      JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+      MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+      CUSTOM("custom"),
+
+      /**
+       * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      OfflinePaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OfflinePaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum EinvoicingMethod {
+      AUTOMATIC("automatic"),
+
+      MANUAL("manual"),
+
+      SITE_DEFAULT("site_default"),
+
+      /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EinvoicingMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EinvoicingMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum CustomerType {
+      RESIDENTIAL("residential"),
+
+      BUSINESS("business"),
+
+      SENIOR_CITIZEN("senior_citizen"),
+
+      INDUSTRIAL("industrial"),
+
+      /** An enum member indicating that CustomerType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      CustomerType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static CustomerType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (CustomerType enumValue : CustomerType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String tmpToken;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String number;
+
+    private final Integer expiryMonth;
+
+    private final Integer expiryYear;
+
+    private final String cvv;
+
+    private final PreferredScheme preferredScheme;
+
+    private final String billingAddr1;
+
+    private final String billingAddr2;
+
+    private final String billingCity;
+
+    private final String billingStateCode;
+
+    private final String billingState;
+
+    private final String billingZip;
+
+    private final String billingCountry;
+
+    private final String ipAddress;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.number = builder.number;
+
+      this.expiryMonth = builder.expiryMonth;
+
+      this.expiryYear = builder.expiryYear;
+
+      this.cvv = builder.cvv;
+
+      this.preferredScheme = builder.preferredScheme;
+
+      this.billingAddr1 = builder.billingAddr1;
+
+      this.billingAddr2 = builder.billingAddr2;
+
+      this.billingCity = builder.billingCity;
+
+      this.billingStateCode = builder.billingStateCode;
+
+      this.billingState = builder.billingState;
+
+      this.billingZip = builder.billingZip;
+
+      this.billingCountry = builder.billingCountry;
+
+      this.ipAddress = builder.ipAddress;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getNumber() {
+      return number;
+    }
+
+    public Integer getExpiryMonth() {
+      return expiryMonth;
+    }
+
+    public Integer getExpiryYear() {
+      return expiryYear;
+    }
+
+    public String getCvv() {
+      return cvv;
+    }
+
+    public PreferredScheme getPreferredScheme() {
+      return preferredScheme;
+    }
+
+    public String getBillingAddr1() {
+      return billingAddr1;
+    }
+
+    public String getBillingAddr2() {
+      return billingAddr2;
+    }
+
+    public String getBillingCity() {
+      return billingCity;
+    }
+
+    public String getBillingStateCode() {
+      return billingStateCode;
+    }
+
+    public String getBillingState() {
+      return billingState;
+    }
+
+    public String getBillingZip() {
+      return billingZip;
+    }
+
+    public String getBillingCountry() {
+      return billingCountry;
+    }
+
+    public String getIpAddress() {
+      return ipAddress;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.number != null) {
+
+        formData.put("number", this.number);
+      }
+
+      if (this.expiryMonth != null) {
+
+        formData.put("expiry_month", this.expiryMonth);
+      }
+
+      if (this.expiryYear != null) {
+
+        formData.put("expiry_year", this.expiryYear);
+      }
+
+      if (this.cvv != null) {
+
+        formData.put("cvv", this.cvv);
+      }
+
+      if (this.preferredScheme != null) {
+
+        formData.put("preferred_scheme", this.preferredScheme);
+      }
+
+      if (this.billingAddr1 != null) {
+
+        formData.put("billing_addr1", this.billingAddr1);
+      }
+
+      if (this.billingAddr2 != null) {
+
+        formData.put("billing_addr2", this.billingAddr2);
+      }
+
+      if (this.billingCity != null) {
+
+        formData.put("billing_city", this.billingCity);
+      }
+
+      if (this.billingStateCode != null) {
+
+        formData.put("billing_state_code", this.billingStateCode);
+      }
+
+      if (this.billingState != null) {
+
+        formData.put("billing_state", this.billingState);
+      }
+
+      if (this.billingZip != null) {
+
+        formData.put("billing_zip", this.billingZip);
+      }
+
+      if (this.billingCountry != null) {
+
+        formData.put("billing_country", this.billingCountry);
+      }
+
+      if (this.ipAddress != null) {
+
+        formData.put("ip_address", this.ipAddress);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String tmpToken;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String number;
+
+      private Integer expiryMonth;
+
+      private Integer expiryYear;
+
+      private String cvv;
+
+      private PreferredScheme preferredScheme;
+
+      private String billingAddr1;
+
+      private String billingAddr2;
+
+      private String billingCity;
+
+      private String billingStateCode;
+
+      private String billingState;
+
+      private String billingZip;
+
+      private String billingCountry;
+
+      private String ipAddress;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      @Deprecated
+      public CardBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public CardBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CardBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CardBuilder number(String value) {
+        this.number = value;
+        return this;
+      }
+
+      public CardBuilder expiryMonth(Integer value) {
+        this.expiryMonth = value;
+        return this;
+      }
+
+      public CardBuilder expiryYear(Integer value) {
+        this.expiryYear = value;
+        return this;
+      }
+
+      public CardBuilder cvv(String value) {
+        this.cvv = value;
+        return this;
+      }
+
+      public CardBuilder preferredScheme(PreferredScheme value) {
+        this.preferredScheme = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr1(String value) {
+        this.billingAddr1 = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr2(String value) {
+        this.billingAddr2 = value;
+        return this;
+      }
+
+      public CardBuilder billingCity(String value) {
+        this.billingCity = value;
+        return this;
+      }
+
+      public CardBuilder billingStateCode(String value) {
+        this.billingStateCode = value;
+        return this;
+      }
+
+      public CardBuilder billingState(String value) {
+        this.billingState = value;
+        return this;
+      }
+
+      public CardBuilder billingZip(String value) {
+        this.billingZip = value;
+        return this;
+      }
+
+      public CardBuilder billingCountry(String value) {
+        this.billingCountry = value;
+        return this;
+      }
+
+      @Deprecated
+      public CardBuilder ipAddress(String value) {
+        this.ipAddress = value;
+        return this;
+      }
+
+      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PreferredScheme {
+      CARTES_BANCAIRES("cartes_bancaires"),
+
+      MASTERCARD("mastercard"),
+
+      VISA("visa"),
+
+      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PreferredScheme(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PreferredScheme fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PreferredScheme enumValue : PreferredScheme.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BankAccountParams {
+
+    private final String gatewayAccountId;
+
+    private final String iban;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String company;
+
+    private final String email;
+
+    private final String phone;
+
+    private final String bankName;
+
+    private final String accountNumber;
+
+    private final String routingNumber;
+
+    private final String bankCode;
+
+    private final AccountType accountType;
+
+    private final AccountHolderType accountHolderType;
+
+    private final EcheckType echeckType;
+
+    private final String issuingCountry;
+
+    private final String swedishIdentityNumber;
+
+    private final java.util.Map<String, Object> billingAddress;
+
+    private BankAccountParams(BankAccountBuilder builder) {
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.iban = builder.iban;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.company = builder.company;
+
+      this.email = builder.email;
+
+      this.phone = builder.phone;
+
+      this.bankName = builder.bankName;
+
+      this.accountNumber = builder.accountNumber;
+
+      this.routingNumber = builder.routingNumber;
+
+      this.bankCode = builder.bankCode;
+
+      this.accountType = builder.accountType;
+
+      this.accountHolderType = builder.accountHolderType;
+
+      this.echeckType = builder.echeckType;
+
+      this.issuingCountry = builder.issuingCountry;
+
+      this.swedishIdentityNumber = builder.swedishIdentityNumber;
+
+      this.billingAddress = builder.billingAddress;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getIban() {
+      return iban;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getBankName() {
+      return bankName;
+    }
+
+    public String getAccountNumber() {
+      return accountNumber;
+    }
+
+    public String getRoutingNumber() {
+      return routingNumber;
+    }
+
+    public String getBankCode() {
+      return bankCode;
+    }
+
+    public AccountType getAccountType() {
+      return accountType;
+    }
+
+    public AccountHolderType getAccountHolderType() {
+      return accountHolderType;
+    }
+
+    public EcheckType getEcheckType() {
+      return echeckType;
+    }
+
+    public String getIssuingCountry() {
+      return issuingCountry;
+    }
+
+    public String getSwedishIdentityNumber() {
+      return swedishIdentityNumber;
+    }
+
+    public java.util.Map<String, Object> getBillingAddress() {
+      return billingAddress;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.iban != null) {
+
+        formData.put("iban", this.iban);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.bankName != null) {
+
+        formData.put("bank_name", this.bankName);
+      }
+
+      if (this.accountNumber != null) {
+
+        formData.put("account_number", this.accountNumber);
+      }
+
+      if (this.routingNumber != null) {
+
+        formData.put("routing_number", this.routingNumber);
+      }
+
+      if (this.bankCode != null) {
+
+        formData.put("bank_code", this.bankCode);
+      }
+
+      if (this.accountType != null) {
+
+        formData.put("account_type", this.accountType);
+      }
+
+      if (this.accountHolderType != null) {
+
+        formData.put("account_holder_type", this.accountHolderType);
+      }
+
+      if (this.echeckType != null) {
+
+        formData.put("echeck_type", this.echeckType);
+      }
+
+      if (this.issuingCountry != null) {
+
+        formData.put("issuing_country", this.issuingCountry);
+      }
+
+      if (this.swedishIdentityNumber != null) {
+
+        formData.put("swedish_identity_number", this.swedishIdentityNumber);
+      }
+
+      if (this.billingAddress != null) {
+
+        formData.put("billing_address", JsonUtil.toJson(this.billingAddress));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BankAccountParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BankAccountBuilder builder() {
+      return new BankAccountBuilder();
+    }
+
+    public static final class BankAccountBuilder {
+
+      private String gatewayAccountId;
+
+      private String iban;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String company;
+
+      private String email;
+
+      private String phone;
+
+      private String bankName;
+
+      private String accountNumber;
+
+      private String routingNumber;
+
+      private String bankCode;
+
+      private AccountType accountType;
+
+      private AccountHolderType accountHolderType;
+
+      private EcheckType echeckType;
+
+      private String issuingCountry;
+
+      private String swedishIdentityNumber;
+
+      private java.util.Map<String, Object> billingAddress;
+
+      private BankAccountBuilder() {}
+
+      public BankAccountBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public BankAccountBuilder iban(String value) {
+        this.iban = value;
+        return this;
+      }
+
+      public BankAccountBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BankAccountBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BankAccountBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BankAccountBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BankAccountBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BankAccountBuilder bankName(String value) {
+        this.bankName = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountNumber(String value) {
+        this.accountNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder routingNumber(String value) {
+        this.routingNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder bankCode(String value) {
+        this.bankCode = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountType(AccountType value) {
+        this.accountType = value;
+        return this;
+      }
+
+      public BankAccountBuilder accountHolderType(AccountHolderType value) {
+        this.accountHolderType = value;
+        return this;
+      }
+
+      public BankAccountBuilder echeckType(EcheckType value) {
+        this.echeckType = value;
+        return this;
+      }
+
+      public BankAccountBuilder issuingCountry(String value) {
+        this.issuingCountry = value;
+        return this;
+      }
+
+      public BankAccountBuilder swedishIdentityNumber(String value) {
+        this.swedishIdentityNumber = value;
+        return this;
+      }
+
+      public BankAccountBuilder billingAddress(java.util.Map<String, Object> value) {
+        this.billingAddress = value;
+        return this;
+      }
+
+      public BankAccountParams build() {
+        return new BankAccountParams(this);
+      }
+    }
+
+    public enum AccountType {
+      CHECKING("checking"),
+
+      SAVINGS("savings"),
+
+      BUSINESS_CHECKING("business_checking"),
+
+      CURRENT("current"),
+
+      /** An enum member indicating that AccountType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AccountType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AccountType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AccountType enumValue : AccountType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum AccountHolderType {
+      INDIVIDUAL("individual"),
+
+      COMPANY("company"),
+
+      /**
+       * An enum member indicating that AccountHolderType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      AccountHolderType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AccountHolderType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AccountHolderType enumValue : AccountHolderType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum EcheckType {
+      WEB("web"),
+
+      PPD("ppd"),
+
+      CCD("ccd"),
+
+      /** An enum member indicating that EcheckType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EcheckType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EcheckType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EcheckType enumValue : EcheckType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentMethodParams {
+
+    private final Type type;
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String referenceId;
+
+    private final String tmpToken;
+
+    private final String issuingCountry;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentMethodParams(PaymentMethodBuilder builder) {
+
+      this.type = builder.type;
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.referenceId = builder.referenceId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.issuingCountry = builder.issuingCountry;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getIssuingCountry() {
+      return issuingCountry;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.issuingCountry != null) {
+
+        formData.put("issuing_country", this.issuingCountry);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentMethodBuilder builder() {
+      return new PaymentMethodBuilder();
+    }
+
+    public static final class PaymentMethodBuilder {
+
+      private Type type;
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String referenceId;
+
+      private String tmpToken;
+
+      private String issuingCountry;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentMethodBuilder() {}
+
+      public PaymentMethodBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentMethodBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder issuingCountry(String value) {
+        this.issuingCountry = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentMethodParams build() {
+        return new PaymentMethodParams(this);
+      }
+    }
+
+    public enum Type {
+      CARD("card"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      GENERIC("generic"),
+
+      ALIPAY("alipay"),
+
+      UNIONPAY("unionpay"),
+
+      APPLE_PAY("apple_pay"),
+
+      WECHAT_PAY("wechat_pay"),
+
+      IDEAL("ideal"),
+
+      GOOGLE_PAY("google_pay"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GIROPAY("giropay"),
+
+      DOTPAY("dotpay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      VENMO("venmo"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      GOCARDLESS("gocardless"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatementDescriptorParams {
+
+    private final String descriptor;
+
+    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
+
+      this.descriptor = builder.descriptor;
+    }
+
+    public String getDescriptor() {
+      return descriptor;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.descriptor != null) {
+
+        formData.put("descriptor", this.descriptor);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatementDescriptorParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatementDescriptorBuilder builder() {
+      return new StatementDescriptorBuilder();
+    }
+
+    public static final class StatementDescriptorBuilder {
+
+      private String descriptor;
+
+      private StatementDescriptorBuilder() {}
+
+      public StatementDescriptorBuilder descriptor(String value) {
+        this.descriptor = value;
+        return this;
+      }
+
+      public StatementDescriptorParams build() {
+        return new StatementDescriptorParams(this);
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class EntityIdentifiersParams {
+
+    private final String id;
+
+    private final String scheme;
+
+    private final String value;
+
+    private final String standard;
+
+    private EntityIdentifiersParams(EntityIdentifiersBuilder builder) {
+
+      this.id = builder.id;
+
+      this.scheme = builder.scheme;
+
+      this.value = builder.value;
+
+      this.standard = builder.standard;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getScheme() {
+      return scheme;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public String getStandard() {
+      return standard;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.scheme != null) {
+
+        formData.put("scheme", this.scheme);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      if (this.standard != null) {
+
+        formData.put("standard", this.standard);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EntityIdentifiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EntityIdentifiersBuilder builder() {
+      return new EntityIdentifiersBuilder();
+    }
+
+    public static final class EntityIdentifiersBuilder {
+
+      private String id;
+
+      private String scheme;
+
+      private String value;
+
+      private String standard;
+
+      private EntityIdentifiersBuilder() {}
+
+      public EntityIdentifiersBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder scheme(String value) {
+        this.scheme = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public EntityIdentifiersBuilder standard(String value) {
+        this.standard = value;
+        return this;
+      }
+
+      public EntityIdentifiersParams build() {
+        return new EntityIdentifiersParams(this);
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AddonsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriodInDays;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOn chargeOn;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOn = builder.chargeOn;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOn getChargeOn() {
+      return chargeOn;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOn != null) {
+
+        formData.put("charge_on", this.chargeOn);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriodInDays;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOn chargeOn;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
+        this.chargeOn = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOn {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOn enumValue : ChargeOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponsParams {
+
+    private final String couponId;
+
+    private final Timestamp applyTill;
+
+    private CouponsParams(CouponsBuilder builder) {
+
+      this.couponId = builder.couponId;
+
+      this.applyTill = builder.applyTill;
+    }
+
+    public String getCouponId() {
+      return couponId;
+    }
+
+    public Timestamp getApplyTill() {
+      return applyTill;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.couponId != null) {
+
+        formData.put("coupon_id", this.couponId);
+      }
+
+      if (this.applyTill != null) {
+
+        formData.put("apply_till", this.applyTill);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsBuilder builder() {
+      return new CouponsBuilder();
+    }
+
+    public static final class CouponsBuilder {
+
+      private String couponId;
+
+      private Timestamp applyTill;
+
+      private CouponsBuilder() {}
+
+      public CouponsBuilder couponId(String value) {
+        this.couponId = value;
+        return this;
+      }
+
+      public CouponsBuilder applyTill(Timestamp value) {
+        this.applyTill = value;
+        return this;
+      }
+
+      public CouponsParams build() {
+        return new CouponsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCreateWithItemsParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCreateWithItemsParams.java
new file mode 100644
index 00000000..3ade7a23
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionCreateWithItemsParams.java
@@ -0,0 +1,2985 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class SubscriptionCreateWithItemsParams {
+
+  private final String id;
+
+  private final String businessEntityId;
+
+  private final Timestamp trialEnd;
+
+  private final Integer billingCycles;
+
+  private final Long setupFee;
+
+  private final List<String> mandatoryItemsToRemove;
+
+  private final Integer netTermDays;
+
+  private final Timestamp startDate;
+
+  private final String coupon;
+
+  private final AutoCollection autoCollection;
+
+  private final Integer termsToCharge;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final OfflinePaymentMethod offlinePaymentMethod;
+
+  private final String poNumber;
+
+  private final List<String> couponIds;
+
+  private final String paymentSourceId;
+
+  private final Boolean overrideRelationship;
+
+  private final String invoiceNotes;
+
+  private final Timestamp invoiceDate;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final Boolean invoiceImmediately;
+
+  private final Boolean replacePrimaryPaymentSource;
+
+  private final Integer freePeriod;
+
+  private final FreePeriodUnit freePeriodUnit;
+
+  private final Integer contractTermBillingCycleOnRenewal;
+
+  private final Boolean createPendingInvoices;
+
+  private final Boolean autoCloseInvoices;
+
+  private final Boolean firstInvoicePending;
+
+  private final TrialEndAction trialEndAction;
+
+  private final PaymentInitiator paymentInitiator;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final StatementDescriptorParams statementDescriptor;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final ContractTermParams contractTerm;
+
+  private final BillingOverrideParams billingOverride;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<CouponsParams> coupons;
+
+  private final Map<String, String> customFields;
+
+  private SubscriptionCreateWithItemsParams(SubscriptionCreateWithItemsBuilder builder) {
+
+    this.id = builder.id;
+
+    this.businessEntityId = builder.businessEntityId;
+
+    this.trialEnd = builder.trialEnd;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.setupFee = builder.setupFee;
+
+    this.mandatoryItemsToRemove = builder.mandatoryItemsToRemove;
+
+    this.netTermDays = builder.netTermDays;
+
+    this.startDate = builder.startDate;
+
+    this.coupon = builder.coupon;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+    this.poNumber = builder.poNumber;
+
+    this.couponIds = builder.couponIds;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.overrideRelationship = builder.overrideRelationship;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.metaData = builder.metaData;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.replacePrimaryPaymentSource = builder.replacePrimaryPaymentSource;
+
+    this.freePeriod = builder.freePeriod;
+
+    this.freePeriodUnit = builder.freePeriodUnit;
+
+    this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+    this.createPendingInvoices = builder.createPendingInvoices;
+
+    this.autoCloseInvoices = builder.autoCloseInvoices;
+
+    this.firstInvoicePending = builder.firstInvoicePending;
+
+    this.trialEndAction = builder.trialEndAction;
+
+    this.paymentInitiator = builder.paymentInitiator;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.statementDescriptor = builder.statementDescriptor;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.billingOverride = builder.billingOverride;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.discounts = builder.discounts;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.coupons = builder.coupons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getBusinessEntityId() {
+    return businessEntityId;
+  }
+
+  public Timestamp getTrialEnd() {
+    return trialEnd;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Long getSetupFee() {
+    return setupFee;
+  }
+
+  public List<String> getMandatoryItemsToRemove() {
+    return mandatoryItemsToRemove;
+  }
+
+  public Integer getNetTermDays() {
+    return netTermDays;
+  }
+
+  public Timestamp getStartDate() {
+    return startDate;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public OfflinePaymentMethod getOfflinePaymentMethod() {
+    return offlinePaymentMethod;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public Boolean getOverrideRelationship() {
+    return overrideRelationship;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public Boolean getReplacePrimaryPaymentSource() {
+    return replacePrimaryPaymentSource;
+  }
+
+  public Integer getFreePeriod() {
+    return freePeriod;
+  }
+
+  public FreePeriodUnit getFreePeriodUnit() {
+    return freePeriodUnit;
+  }
+
+  public Integer getContractTermBillingCycleOnRenewal() {
+    return contractTermBillingCycleOnRenewal;
+  }
+
+  public Boolean getCreatePendingInvoices() {
+    return createPendingInvoices;
+  }
+
+  public Boolean getAutoCloseInvoices() {
+    return autoCloseInvoices;
+  }
+
+  public Boolean getFirstInvoicePending() {
+    return firstInvoicePending;
+  }
+
+  public TrialEndAction getTrialEndAction() {
+    return trialEndAction;
+  }
+
+  public PaymentInitiator getPaymentInitiator() {
+    return paymentInitiator;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public StatementDescriptorParams getStatementDescriptor() {
+    return statementDescriptor;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public BillingOverrideParams getBillingOverride() {
+    return billingOverride;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<CouponsParams> getCoupons() {
+    return coupons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.businessEntityId != null) {
+
+      formData.put("business_entity_id", this.businessEntityId);
+    }
+
+    if (this.trialEnd != null) {
+
+      formData.put("trial_end", this.trialEnd);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.setupFee != null) {
+
+      formData.put("setup_fee", this.setupFee);
+    }
+
+    if (this.mandatoryItemsToRemove != null) {
+
+      formData.put("mandatory_items_to_remove", this.mandatoryItemsToRemove);
+    }
+
+    if (this.netTermDays != null) {
+
+      formData.put("net_term_days", this.netTermDays);
+    }
+
+    if (this.startDate != null) {
+
+      formData.put("start_date", this.startDate);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.offlinePaymentMethod != null) {
+
+      formData.put("offline_payment_method", this.offlinePaymentMethod);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.overrideRelationship != null) {
+
+      formData.put("override_relationship", this.overrideRelationship);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.replacePrimaryPaymentSource != null) {
+
+      formData.put("replace_primary_payment_source", this.replacePrimaryPaymentSource);
+    }
+
+    if (this.freePeriod != null) {
+
+      formData.put("free_period", this.freePeriod);
+    }
+
+    if (this.freePeriodUnit != null) {
+
+      formData.put("free_period_unit", this.freePeriodUnit);
+    }
+
+    if (this.contractTermBillingCycleOnRenewal != null) {
+
+      formData.put(
+          "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+    }
+
+    if (this.createPendingInvoices != null) {
+
+      formData.put("create_pending_invoices", this.createPendingInvoices);
+    }
+
+    if (this.autoCloseInvoices != null) {
+
+      formData.put("auto_close_invoices", this.autoCloseInvoices);
+    }
+
+    if (this.firstInvoicePending != null) {
+
+      formData.put("first_invoice_pending", this.firstInvoicePending);
+    }
+
+    if (this.trialEndAction != null) {
+
+      formData.put("trial_end_action", this.trialEndAction);
+    }
+
+    if (this.paymentInitiator != null) {
+
+      formData.put("payment_initiator", this.paymentInitiator);
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.statementDescriptor != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.statementDescriptor.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingOverride != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingOverride.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_override[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.coupons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.coupons.size(); i++) {
+        CouponsParams item = this.coupons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionCreateWithItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionCreateWithItemsBuilder builder() {
+    return new SubscriptionCreateWithItemsBuilder();
+  }
+
+  public static final class SubscriptionCreateWithItemsBuilder {
+
+    private String id;
+
+    private String businessEntityId;
+
+    private Timestamp trialEnd;
+
+    private Integer billingCycles;
+
+    private Long setupFee;
+
+    private List<String> mandatoryItemsToRemove;
+
+    private Integer netTermDays;
+
+    private Timestamp startDate;
+
+    private String coupon;
+
+    private AutoCollection autoCollection;
+
+    private Integer termsToCharge;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private OfflinePaymentMethod offlinePaymentMethod;
+
+    private String poNumber;
+
+    private List<String> couponIds;
+
+    private String paymentSourceId;
+
+    private Boolean overrideRelationship;
+
+    private String invoiceNotes;
+
+    private Timestamp invoiceDate;
+
+    private java.util.Map<String, Object> metaData;
+
+    private Boolean invoiceImmediately;
+
+    private Boolean replacePrimaryPaymentSource;
+
+    private Integer freePeriod;
+
+    private FreePeriodUnit freePeriodUnit;
+
+    private Integer contractTermBillingCycleOnRenewal;
+
+    private Boolean createPendingInvoices;
+
+    private Boolean autoCloseInvoices;
+
+    private Boolean firstInvoicePending;
+
+    private TrialEndAction trialEndAction;
+
+    private PaymentInitiator paymentInitiator;
+
+    private ShippingAddressParams shippingAddress;
+
+    private StatementDescriptorParams statementDescriptor;
+
+    private PaymentIntentParams paymentIntent;
+
+    private ContractTermParams contractTerm;
+
+    private BillingOverrideParams billingOverride;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<DiscountsParams> discounts;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<CouponsParams> coupons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private SubscriptionCreateWithItemsBuilder() {}
+
+    public SubscriptionCreateWithItemsBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder businessEntityId(String value) {
+      this.businessEntityId = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder trialEnd(Timestamp value) {
+      this.trialEnd = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionCreateWithItemsBuilder setupFee(Long value) {
+      this.setupFee = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder mandatoryItemsToRemove(List<String> value) {
+      this.mandatoryItemsToRemove = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder netTermDays(Integer value) {
+      this.netTermDays = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder startDate(Timestamp value) {
+      this.startDate = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionCreateWithItemsBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+      this.offlinePaymentMethod = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder overrideRelationship(Boolean value) {
+      this.overrideRelationship = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder replacePrimaryPaymentSource(Boolean value) {
+      this.replacePrimaryPaymentSource = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder freePeriod(Integer value) {
+      this.freePeriod = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder freePeriodUnit(FreePeriodUnit value) {
+      this.freePeriodUnit = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder contractTermBillingCycleOnRenewal(Integer value) {
+      this.contractTermBillingCycleOnRenewal = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder createPendingInvoices(Boolean value) {
+      this.createPendingInvoices = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder autoCloseInvoices(Boolean value) {
+      this.autoCloseInvoices = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder firstInvoicePending(Boolean value) {
+      this.firstInvoicePending = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder trialEndAction(TrialEndAction value) {
+      this.trialEndAction = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder paymentInitiator(PaymentInitiator value) {
+      this.paymentInitiator = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder statementDescriptor(StatementDescriptorParams value) {
+      this.statementDescriptor = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder billingOverride(BillingOverrideParams value) {
+      this.billingOverride = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionCreateWithItemsBuilder coupons(List<CouponsParams> value) {
+      this.coupons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public SubscriptionCreateWithItemsBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public SubscriptionCreateWithItemsBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public SubscriptionCreateWithItemsParams build() {
+      return new SubscriptionCreateWithItemsParams(this);
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum OfflinePaymentMethod {
+    NO_PREFERENCE("no_preference"),
+
+    CASH("cash"),
+
+    CHECK("check"),
+
+    BANK_TRANSFER("bank_transfer"),
+
+    ACH_CREDIT("ach_credit"),
+
+    SEPA_CREDIT("sepa_credit"),
+
+    BOLETO("boleto"),
+
+    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+    CUSTOM("custom"),
+
+    /**
+     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    OfflinePaymentMethod(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static OfflinePaymentMethod fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum FreePeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    FreePeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static FreePeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TrialEndAction {
+    SITE_DEFAULT("site_default"),
+
+    PLAN_DEFAULT("plan_default"),
+
+    ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+    CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TrialEndAction(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TrialEndAction fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TrialEndAction enumValue : TrialEndAction.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PaymentInitiator {
+    CUSTOMER("customer"),
+
+    MERCHANT("merchant"),
+
+    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentInitiator(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentInitiator fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatementDescriptorParams {
+
+    private final String descriptor;
+
+    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
+
+      this.descriptor = builder.descriptor;
+    }
+
+    public String getDescriptor() {
+      return descriptor;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.descriptor != null) {
+
+        formData.put("descriptor", this.descriptor);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatementDescriptorParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatementDescriptorBuilder builder() {
+      return new StatementDescriptorBuilder();
+    }
+
+    public static final class StatementDescriptorBuilder {
+
+      private String descriptor;
+
+      private StatementDescriptorBuilder() {}
+
+      public StatementDescriptorBuilder descriptor(String value) {
+        this.descriptor = value;
+        return this;
+      }
+
+      public StatementDescriptorParams build() {
+        return new StatementDescriptorParams(this);
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Timestamp contractStart;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.contractStart = builder.contractStart;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Timestamp getContractStart() {
+      return contractStart;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.contractStart != null) {
+
+        formData.put("contract_start", this.contractStart);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Timestamp contractStart;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      @Deprecated
+      public ContractTermBuilder contractStart(Timestamp value) {
+        this.contractStart = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingOverrideParams {
+
+    private final Long maxExcessPaymentUsage;
+
+    private final Long maxRefundableCreditsUsage;
+
+    private BillingOverrideParams(BillingOverrideBuilder builder) {
+
+      this.maxExcessPaymentUsage = builder.maxExcessPaymentUsage;
+
+      this.maxRefundableCreditsUsage = builder.maxRefundableCreditsUsage;
+    }
+
+    public Long getMaxExcessPaymentUsage() {
+      return maxExcessPaymentUsage;
+    }
+
+    public Long getMaxRefundableCreditsUsage() {
+      return maxRefundableCreditsUsage;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.maxExcessPaymentUsage != null) {
+
+        formData.put("max_excess_payment_usage", this.maxExcessPaymentUsage);
+      }
+
+      if (this.maxRefundableCreditsUsage != null) {
+
+        formData.put("max_refundable_credits_usage", this.maxRefundableCreditsUsage);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingOverrideParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingOverrideBuilder builder() {
+      return new BillingOverrideBuilder();
+    }
+
+    public static final class BillingOverrideBuilder {
+
+      private Long maxExcessPaymentUsage;
+
+      private Long maxRefundableCreditsUsage;
+
+      private BillingOverrideBuilder() {}
+
+      public BillingOverrideBuilder maxExcessPaymentUsage(Long value) {
+        this.maxExcessPaymentUsage = value;
+        return this;
+      }
+
+      public BillingOverrideBuilder maxRefundableCreditsUsage(Long value) {
+        this.maxRefundableCreditsUsage = value;
+        return this;
+      }
+
+      public BillingOverrideParams build() {
+        return new BillingOverrideParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ItemType itemType;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private final UsageAccumulationResetFrequency usageAccumulationResetFrequency;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.itemType = builder.itemType;
+
+      this.chargeOnOption = builder.chargeOnOption;
+
+      this.usageAccumulationResetFrequency = builder.usageAccumulationResetFrequency;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    public UsageAccumulationResetFrequency getUsageAccumulationResetFrequency() {
+      return usageAccumulationResetFrequency;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      if (this.usageAccumulationResetFrequency != null) {
+
+        formData.put("usage_accumulation_reset_frequency", this.usageAccumulationResetFrequency);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ItemType itemType;
+
+      private ChargeOnOption chargeOnOption;
+
+      private UsageAccumulationResetFrequency usageAccumulationResetFrequency;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder usageAccumulationResetFrequency(
+          UsageAccumulationResetFrequency value) {
+        this.usageAccumulationResetFrequency = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum UsageAccumulationResetFrequency {
+      NEVER("never"),
+
+      SUBSCRIPTION_BILLING_FREQUENCY("subscription_billing_frequency"),
+
+      /**
+       * An enum member indicating that UsageAccumulationResetFrequency was instantiated with an
+       * unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      UsageAccumulationResetFrequency(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static UsageAccumulationResetFrequency fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (UsageAccumulationResetFrequency enumValue : UsageAccumulationResetFrequency.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponsParams {
+
+    private final String couponId;
+
+    private final Timestamp applyTill;
+
+    private CouponsParams(CouponsBuilder builder) {
+
+      this.couponId = builder.couponId;
+
+      this.applyTill = builder.applyTill;
+    }
+
+    public String getCouponId() {
+      return couponId;
+    }
+
+    public Timestamp getApplyTill() {
+      return applyTill;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.couponId != null) {
+
+        formData.put("coupon_id", this.couponId);
+      }
+
+      if (this.applyTill != null) {
+
+        formData.put("apply_till", this.applyTill);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsBuilder builder() {
+      return new CouponsBuilder();
+    }
+
+    public static final class CouponsBuilder {
+
+      private String couponId;
+
+      private Timestamp applyTill;
+
+      private CouponsBuilder() {}
+
+      public CouponsBuilder couponId(String value) {
+        this.couponId = value;
+        return this;
+      }
+
+      public CouponsBuilder applyTill(Timestamp value) {
+        this.applyTill = value;
+        return this;
+      }
+
+      public CouponsParams build() {
+        return new CouponsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionDeleteParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionDeleteParams.java
index 3c6a56e5..3ce0c342 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionDeleteParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.subscription.params;
+package com.chargebee.v4.models.subscription.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class SubscriptionDeleteParams {
 
-  private final Map<String, Object> formData;
-
-  private SubscriptionDeleteParams(SubscriptionDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private SubscriptionDeleteParams(SubscriptionDeleteBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static SubscriptionDeleteBuilder builder() {
   }
 
   public static final class SubscriptionDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private SubscriptionDeleteBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionEditAdvanceInvoiceScheduleParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionEditAdvanceInvoiceScheduleParams.java
new file mode 100644
index 00000000..e75530cf
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionEditAdvanceInvoiceScheduleParams.java
@@ -0,0 +1,394 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class SubscriptionEditAdvanceInvoiceScheduleParams {
+
+  private final Integer termsToCharge;
+
+  private final ScheduleType scheduleType;
+
+  private final FixedIntervalScheduleParams fixedIntervalSchedule;
+
+  private final List<SpecificDatesScheduleParams> specificDatesSchedule;
+
+  private SubscriptionEditAdvanceInvoiceScheduleParams(
+      SubscriptionEditAdvanceInvoiceScheduleBuilder builder) {
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.scheduleType = builder.scheduleType;
+
+    this.fixedIntervalSchedule = builder.fixedIntervalSchedule;
+
+    this.specificDatesSchedule = builder.specificDatesSchedule;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public ScheduleType getScheduleType() {
+    return scheduleType;
+  }
+
+  public FixedIntervalScheduleParams getFixedIntervalSchedule() {
+    return fixedIntervalSchedule;
+  }
+
+  public List<SpecificDatesScheduleParams> getSpecificDatesSchedule() {
+    return specificDatesSchedule;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.scheduleType != null) {
+
+      formData.put("schedule_type", this.scheduleType);
+    }
+
+    if (this.fixedIntervalSchedule != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.fixedIntervalSchedule.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "fixed_interval_schedule[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.specificDatesSchedule != null) {
+
+      // List of objects
+      for (int i = 0; i < this.specificDatesSchedule.size(); i++) {
+        SpecificDatesScheduleParams item = this.specificDatesSchedule.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "specific_dates_schedule[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionEditAdvanceInvoiceScheduleParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionEditAdvanceInvoiceScheduleBuilder builder() {
+    return new SubscriptionEditAdvanceInvoiceScheduleBuilder();
+  }
+
+  public static final class SubscriptionEditAdvanceInvoiceScheduleBuilder {
+
+    private Integer termsToCharge;
+
+    private ScheduleType scheduleType;
+
+    private FixedIntervalScheduleParams fixedIntervalSchedule;
+
+    private List<SpecificDatesScheduleParams> specificDatesSchedule;
+
+    private SubscriptionEditAdvanceInvoiceScheduleBuilder() {}
+
+    public SubscriptionEditAdvanceInvoiceScheduleBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public SubscriptionEditAdvanceInvoiceScheduleBuilder scheduleType(ScheduleType value) {
+      this.scheduleType = value;
+      return this;
+    }
+
+    public SubscriptionEditAdvanceInvoiceScheduleBuilder fixedIntervalSchedule(
+        FixedIntervalScheduleParams value) {
+      this.fixedIntervalSchedule = value;
+      return this;
+    }
+
+    public SubscriptionEditAdvanceInvoiceScheduleBuilder specificDatesSchedule(
+        List<SpecificDatesScheduleParams> value) {
+      this.specificDatesSchedule = value;
+      return this;
+    }
+
+    public SubscriptionEditAdvanceInvoiceScheduleParams build() {
+      return new SubscriptionEditAdvanceInvoiceScheduleParams(this);
+    }
+  }
+
+  public enum ScheduleType {
+    SPECIFIC_DATES("specific_dates"),
+
+    FIXED_INTERVALS("fixed_intervals"),
+
+    /** An enum member indicating that ScheduleType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ScheduleType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ScheduleType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ScheduleType enumValue : ScheduleType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class FixedIntervalScheduleParams {
+
+    private final Integer numberOfOccurrences;
+
+    private final Integer daysBeforeRenewal;
+
+    private final EndScheduleOn endScheduleOn;
+
+    private final Timestamp endDate;
+
+    private FixedIntervalScheduleParams(FixedIntervalScheduleBuilder builder) {
+
+      this.numberOfOccurrences = builder.numberOfOccurrences;
+
+      this.daysBeforeRenewal = builder.daysBeforeRenewal;
+
+      this.endScheduleOn = builder.endScheduleOn;
+
+      this.endDate = builder.endDate;
+    }
+
+    public Integer getNumberOfOccurrences() {
+      return numberOfOccurrences;
+    }
+
+    public Integer getDaysBeforeRenewal() {
+      return daysBeforeRenewal;
+    }
+
+    public EndScheduleOn getEndScheduleOn() {
+      return endScheduleOn;
+    }
+
+    public Timestamp getEndDate() {
+      return endDate;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.numberOfOccurrences != null) {
+
+        formData.put("number_of_occurrences", this.numberOfOccurrences);
+      }
+
+      if (this.daysBeforeRenewal != null) {
+
+        formData.put("days_before_renewal", this.daysBeforeRenewal);
+      }
+
+      if (this.endScheduleOn != null) {
+
+        formData.put("end_schedule_on", this.endScheduleOn);
+      }
+
+      if (this.endDate != null) {
+
+        formData.put("end_date", this.endDate);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for FixedIntervalScheduleParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static FixedIntervalScheduleBuilder builder() {
+      return new FixedIntervalScheduleBuilder();
+    }
+
+    public static final class FixedIntervalScheduleBuilder {
+
+      private Integer numberOfOccurrences;
+
+      private Integer daysBeforeRenewal;
+
+      private EndScheduleOn endScheduleOn;
+
+      private Timestamp endDate;
+
+      private FixedIntervalScheduleBuilder() {}
+
+      public FixedIntervalScheduleBuilder numberOfOccurrences(Integer value) {
+        this.numberOfOccurrences = value;
+        return this;
+      }
+
+      public FixedIntervalScheduleBuilder daysBeforeRenewal(Integer value) {
+        this.daysBeforeRenewal = value;
+        return this;
+      }
+
+      public FixedIntervalScheduleBuilder endScheduleOn(EndScheduleOn value) {
+        this.endScheduleOn = value;
+        return this;
+      }
+
+      public FixedIntervalScheduleBuilder endDate(Timestamp value) {
+        this.endDate = value;
+        return this;
+      }
+
+      public FixedIntervalScheduleParams build() {
+        return new FixedIntervalScheduleParams(this);
+      }
+    }
+
+    public enum EndScheduleOn {
+      AFTER_NUMBER_OF_INTERVALS("after_number_of_intervals"),
+
+      SPECIFIC_DATE("specific_date"),
+
+      SUBSCRIPTION_END("subscription_end"),
+
+      /** An enum member indicating that EndScheduleOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EndScheduleOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EndScheduleOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EndScheduleOn enumValue : EndScheduleOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SpecificDatesScheduleParams {
+
+    private final String id;
+
+    private final Integer termsToCharge;
+
+    private final Timestamp date;
+
+    private SpecificDatesScheduleParams(SpecificDatesScheduleBuilder builder) {
+
+      this.id = builder.id;
+
+      this.termsToCharge = builder.termsToCharge;
+
+      this.date = builder.date;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getTermsToCharge() {
+      return termsToCharge;
+    }
+
+    public Timestamp getDate() {
+      return date;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.termsToCharge != null) {
+
+        formData.put("terms_to_charge", this.termsToCharge);
+      }
+
+      if (this.date != null) {
+
+        formData.put("date", this.date);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SpecificDatesScheduleParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SpecificDatesScheduleBuilder builder() {
+      return new SpecificDatesScheduleBuilder();
+    }
+
+    public static final class SpecificDatesScheduleBuilder {
+
+      private String id;
+
+      private Integer termsToCharge;
+
+      private Timestamp date;
+
+      private SpecificDatesScheduleBuilder() {}
+
+      public SpecificDatesScheduleBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SpecificDatesScheduleBuilder termsToCharge(Integer value) {
+        this.termsToCharge = value;
+        return this;
+      }
+
+      public SpecificDatesScheduleBuilder date(Timestamp value) {
+        this.date = value;
+        return this;
+      }
+
+      public SpecificDatesScheduleParams build() {
+        return new SpecificDatesScheduleParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionImportContractTermParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionImportContractTermParams.java
new file mode 100644
index 00000000..49008c13
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionImportContractTermParams.java
@@ -0,0 +1,419 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class SubscriptionImportContractTermParams {
+
+  private final Integer contractTermBillingCycleOnRenewal;
+
+  private final ContractTermParams contractTerm;
+
+  private SubscriptionImportContractTermParams(SubscriptionImportContractTermBuilder builder) {
+
+    this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+    this.contractTerm = builder.contractTerm;
+  }
+
+  public Integer getContractTermBillingCycleOnRenewal() {
+    return contractTermBillingCycleOnRenewal;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.contractTermBillingCycleOnRenewal != null) {
+
+      formData.put(
+          "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionImportContractTermParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionImportContractTermBuilder builder() {
+    return new SubscriptionImportContractTermBuilder();
+  }
+
+  public static final class SubscriptionImportContractTermBuilder {
+
+    private Integer contractTermBillingCycleOnRenewal;
+
+    private ContractTermParams contractTerm;
+
+    private SubscriptionImportContractTermBuilder() {}
+
+    public SubscriptionImportContractTermBuilder contractTermBillingCycleOnRenewal(Integer value) {
+      this.contractTermBillingCycleOnRenewal = value;
+      return this;
+    }
+
+    public SubscriptionImportContractTermBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public SubscriptionImportContractTermParams build() {
+      return new SubscriptionImportContractTermParams(this);
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final String id;
+
+    private final Timestamp createdAt;
+
+    private final Timestamp contractStart;
+
+    private final Timestamp contractEnd;
+
+    private final Status status;
+
+    private final Long totalAmountRaised;
+
+    private final Long totalAmountRaisedBeforeTax;
+
+    private final Long totalContractValue;
+
+    private final Long totalContractValueBeforeTax;
+
+    private final Integer billingCycle;
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.id = builder.id;
+
+      this.createdAt = builder.createdAt;
+
+      this.contractStart = builder.contractStart;
+
+      this.contractEnd = builder.contractEnd;
+
+      this.status = builder.status;
+
+      this.totalAmountRaised = builder.totalAmountRaised;
+
+      this.totalAmountRaisedBeforeTax = builder.totalAmountRaisedBeforeTax;
+
+      this.totalContractValue = builder.totalContractValue;
+
+      this.totalContractValueBeforeTax = builder.totalContractValueBeforeTax;
+
+      this.billingCycle = builder.billingCycle;
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getCreatedAt() {
+      return createdAt;
+    }
+
+    public Timestamp getContractStart() {
+      return contractStart;
+    }
+
+    public Timestamp getContractEnd() {
+      return contractEnd;
+    }
+
+    public Status getStatus() {
+      return status;
+    }
+
+    public Long getTotalAmountRaised() {
+      return totalAmountRaised;
+    }
+
+    public Long getTotalAmountRaisedBeforeTax() {
+      return totalAmountRaisedBeforeTax;
+    }
+
+    public Long getTotalContractValue() {
+      return totalContractValue;
+    }
+
+    public Long getTotalContractValueBeforeTax() {
+      return totalContractValueBeforeTax;
+    }
+
+    public Integer getBillingCycle() {
+      return billingCycle;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.createdAt != null) {
+
+        formData.put("created_at", this.createdAt);
+      }
+
+      if (this.contractStart != null) {
+
+        formData.put("contract_start", this.contractStart);
+      }
+
+      if (this.contractEnd != null) {
+
+        formData.put("contract_end", this.contractEnd);
+      }
+
+      if (this.status != null) {
+
+        formData.put("status", this.status);
+      }
+
+      if (this.totalAmountRaised != null) {
+
+        formData.put("total_amount_raised", this.totalAmountRaised);
+      }
+
+      if (this.totalAmountRaisedBeforeTax != null) {
+
+        formData.put("total_amount_raised_before_tax", this.totalAmountRaisedBeforeTax);
+      }
+
+      if (this.totalContractValue != null) {
+
+        formData.put("total_contract_value", this.totalContractValue);
+      }
+
+      if (this.totalContractValueBeforeTax != null) {
+
+        formData.put("total_contract_value_before_tax", this.totalContractValueBeforeTax);
+      }
+
+      if (this.billingCycle != null) {
+
+        formData.put("billing_cycle", this.billingCycle);
+      }
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private String id;
+
+      private Timestamp createdAt;
+
+      private Timestamp contractStart;
+
+      private Timestamp contractEnd;
+
+      private Status status;
+
+      private Long totalAmountRaised;
+
+      private Long totalAmountRaisedBeforeTax;
+
+      private Long totalContractValue;
+
+      private Long totalContractValueBeforeTax;
+
+      private Integer billingCycle;
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public ContractTermBuilder createdAt(Timestamp value) {
+        this.createdAt = value;
+        return this;
+      }
+
+      public ContractTermBuilder contractStart(Timestamp value) {
+        this.contractStart = value;
+        return this;
+      }
+
+      public ContractTermBuilder contractEnd(Timestamp value) {
+        this.contractEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder status(Status value) {
+        this.status = value;
+        return this;
+      }
+
+      public ContractTermBuilder totalAmountRaised(Long value) {
+        this.totalAmountRaised = value;
+        return this;
+      }
+
+      public ContractTermBuilder totalAmountRaisedBeforeTax(Long value) {
+        this.totalAmountRaisedBeforeTax = value;
+        return this;
+      }
+
+      public ContractTermBuilder totalContractValue(Long value) {
+        this.totalContractValue = value;
+        return this;
+      }
+
+      public ContractTermBuilder totalContractValueBeforeTax(Long value) {
+        this.totalContractValueBeforeTax = value;
+        return this;
+      }
+
+      public ContractTermBuilder billingCycle(Integer value) {
+        this.billingCycle = value;
+        return this;
+      }
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum Status {
+      ACTIVE("active"),
+
+      COMPLETED("completed"),
+
+      CANCELLED("cancelled"),
+
+      TERMINATED("terminated"),
+
+      /** An enum member indicating that Status was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Status(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Status fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Status enumValue : Status.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionImportForCustomerParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionImportForCustomerParams.java
new file mode 100644
index 00000000..7030eff9
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionImportForCustomerParams.java
@@ -0,0 +1,2112 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class SubscriptionImportForCustomerParams {
+
+  private final String id;
+
+  private final String planId;
+
+  private final Integer planQuantity;
+
+  private final String planQuantityInDecimal;
+
+  private final Long planUnitPrice;
+
+  private final String planUnitPriceInDecimal;
+
+  private final Long setupFee;
+
+  private final Timestamp trialEnd;
+
+  private final Integer billingCycles;
+
+  private final Timestamp startDate;
+
+  private final AutoCollection autoCollection;
+
+  private final String poNumber;
+
+  private final List<String> couponIds;
+
+  private final String paymentSourceId;
+
+  private final Status status;
+
+  private final Timestamp currentTermEnd;
+
+  private final Timestamp currentTermStart;
+
+  private final Timestamp trialStart;
+
+  private final Timestamp cancelledAt;
+
+  private final Timestamp startedAt;
+
+  private final Timestamp activatedAt;
+
+  private final Timestamp pauseDate;
+
+  private final Timestamp resumeDate;
+
+  private final Integer contractTermBillingCycleOnRenewal;
+
+  private final Boolean createCurrentTermInvoice;
+
+  private final String invoiceNotes;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final ContractTermParams contractTerm;
+
+  private final TransactionParams transaction;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<AddonsParams> addons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private final List<ChargedEventBasedAddonsParams> chargedEventBasedAddons;
+
+  private final List<CouponsParams> coupons;
+
+  private final Map<String, String> customFields;
+
+  private SubscriptionImportForCustomerParams(SubscriptionImportForCustomerBuilder builder) {
+
+    this.id = builder.id;
+
+    this.planId = builder.planId;
+
+    this.planQuantity = builder.planQuantity;
+
+    this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+    this.planUnitPrice = builder.planUnitPrice;
+
+    this.planUnitPriceInDecimal = builder.planUnitPriceInDecimal;
+
+    this.setupFee = builder.setupFee;
+
+    this.trialEnd = builder.trialEnd;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.startDate = builder.startDate;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.poNumber = builder.poNumber;
+
+    this.couponIds = builder.couponIds;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.status = builder.status;
+
+    this.currentTermEnd = builder.currentTermEnd;
+
+    this.currentTermStart = builder.currentTermStart;
+
+    this.trialStart = builder.trialStart;
+
+    this.cancelledAt = builder.cancelledAt;
+
+    this.startedAt = builder.startedAt;
+
+    this.activatedAt = builder.activatedAt;
+
+    this.pauseDate = builder.pauseDate;
+
+    this.resumeDate = builder.resumeDate;
+
+    this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+    this.createCurrentTermInvoice = builder.createCurrentTermInvoice;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.metaData = builder.metaData;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.transaction = builder.transaction;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.addons = builder.addons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+
+    this.chargedEventBasedAddons = builder.chargedEventBasedAddons;
+
+    this.coupons = builder.coupons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getPlanId() {
+    return planId;
+  }
+
+  public Integer getPlanQuantity() {
+    return planQuantity;
+  }
+
+  public String getPlanQuantityInDecimal() {
+    return planQuantityInDecimal;
+  }
+
+  public Long getPlanUnitPrice() {
+    return planUnitPrice;
+  }
+
+  public String getPlanUnitPriceInDecimal() {
+    return planUnitPriceInDecimal;
+  }
+
+  public Long getSetupFee() {
+    return setupFee;
+  }
+
+  public Timestamp getTrialEnd() {
+    return trialEnd;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Timestamp getStartDate() {
+    return startDate;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public Timestamp getCurrentTermEnd() {
+    return currentTermEnd;
+  }
+
+  public Timestamp getCurrentTermStart() {
+    return currentTermStart;
+  }
+
+  public Timestamp getTrialStart() {
+    return trialStart;
+  }
+
+  public Timestamp getCancelledAt() {
+    return cancelledAt;
+  }
+
+  public Timestamp getStartedAt() {
+    return startedAt;
+  }
+
+  public Timestamp getActivatedAt() {
+    return activatedAt;
+  }
+
+  public Timestamp getPauseDate() {
+    return pauseDate;
+  }
+
+  public Timestamp getResumeDate() {
+    return resumeDate;
+  }
+
+  public Integer getContractTermBillingCycleOnRenewal() {
+    return contractTermBillingCycleOnRenewal;
+  }
+
+  public Boolean getCreateCurrentTermInvoice() {
+    return createCurrentTermInvoice;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public TransactionParams getTransaction() {
+    return transaction;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  public List<ChargedEventBasedAddonsParams> getChargedEventBasedAddons() {
+    return chargedEventBasedAddons;
+  }
+
+  public List<CouponsParams> getCoupons() {
+    return coupons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.planId != null) {
+
+      formData.put("plan_id", this.planId);
+    }
+
+    if (this.planQuantity != null) {
+
+      formData.put("plan_quantity", this.planQuantity);
+    }
+
+    if (this.planQuantityInDecimal != null) {
+
+      formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+    }
+
+    if (this.planUnitPrice != null) {
+
+      formData.put("plan_unit_price", this.planUnitPrice);
+    }
+
+    if (this.planUnitPriceInDecimal != null) {
+
+      formData.put("plan_unit_price_in_decimal", this.planUnitPriceInDecimal);
+    }
+
+    if (this.setupFee != null) {
+
+      formData.put("setup_fee", this.setupFee);
+    }
+
+    if (this.trialEnd != null) {
+
+      formData.put("trial_end", this.trialEnd);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.startDate != null) {
+
+      formData.put("start_date", this.startDate);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.currentTermEnd != null) {
+
+      formData.put("current_term_end", this.currentTermEnd);
+    }
+
+    if (this.currentTermStart != null) {
+
+      formData.put("current_term_start", this.currentTermStart);
+    }
+
+    if (this.trialStart != null) {
+
+      formData.put("trial_start", this.trialStart);
+    }
+
+    if (this.cancelledAt != null) {
+
+      formData.put("cancelled_at", this.cancelledAt);
+    }
+
+    if (this.startedAt != null) {
+
+      formData.put("started_at", this.startedAt);
+    }
+
+    if (this.activatedAt != null) {
+
+      formData.put("activated_at", this.activatedAt);
+    }
+
+    if (this.pauseDate != null) {
+
+      formData.put("pause_date", this.pauseDate);
+    }
+
+    if (this.resumeDate != null) {
+
+      formData.put("resume_date", this.resumeDate);
+    }
+
+    if (this.contractTermBillingCycleOnRenewal != null) {
+
+      formData.put(
+          "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+    }
+
+    if (this.createCurrentTermInvoice != null) {
+
+      formData.put("create_current_term_invoice", this.createCurrentTermInvoice);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.transaction != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.transaction.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "transaction[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.chargedEventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.chargedEventBasedAddons.size(); i++) {
+        ChargedEventBasedAddonsParams item = this.chargedEventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charged_event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.coupons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.coupons.size(); i++) {
+        CouponsParams item = this.coupons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionImportForCustomerParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionImportForCustomerBuilder builder() {
+    return new SubscriptionImportForCustomerBuilder();
+  }
+
+  public static final class SubscriptionImportForCustomerBuilder {
+
+    private String id;
+
+    private String planId;
+
+    private Integer planQuantity;
+
+    private String planQuantityInDecimal;
+
+    private Long planUnitPrice;
+
+    private String planUnitPriceInDecimal;
+
+    private Long setupFee;
+
+    private Timestamp trialEnd;
+
+    private Integer billingCycles;
+
+    private Timestamp startDate;
+
+    private AutoCollection autoCollection;
+
+    private String poNumber;
+
+    private List<String> couponIds;
+
+    private String paymentSourceId;
+
+    private Status status;
+
+    private Timestamp currentTermEnd;
+
+    private Timestamp currentTermStart;
+
+    private Timestamp trialStart;
+
+    private Timestamp cancelledAt;
+
+    private Timestamp startedAt;
+
+    private Timestamp activatedAt;
+
+    private Timestamp pauseDate;
+
+    private Timestamp resumeDate;
+
+    private Integer contractTermBillingCycleOnRenewal;
+
+    private Boolean createCurrentTermInvoice;
+
+    private String invoiceNotes;
+
+    private java.util.Map<String, Object> metaData;
+
+    private ContractTermParams contractTerm;
+
+    private TransactionParams transaction;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<AddonsParams> addons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private List<ChargedEventBasedAddonsParams> chargedEventBasedAddons;
+
+    private List<CouponsParams> coupons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private SubscriptionImportForCustomerBuilder() {}
+
+    public SubscriptionImportForCustomerBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder planId(String value) {
+      this.planId = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder planQuantity(Integer value) {
+      this.planQuantity = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder planQuantityInDecimal(String value) {
+      this.planQuantityInDecimal = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder planUnitPrice(Long value) {
+      this.planUnitPrice = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder planUnitPriceInDecimal(String value) {
+      this.planUnitPriceInDecimal = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder setupFee(Long value) {
+      this.setupFee = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder trialEnd(Timestamp value) {
+      this.trialEnd = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder startDate(Timestamp value) {
+      this.startDate = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder currentTermEnd(Timestamp value) {
+      this.currentTermEnd = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder currentTermStart(Timestamp value) {
+      this.currentTermStart = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder trialStart(Timestamp value) {
+      this.trialStart = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder cancelledAt(Timestamp value) {
+      this.cancelledAt = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder startedAt(Timestamp value) {
+      this.startedAt = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder activatedAt(Timestamp value) {
+      this.activatedAt = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder pauseDate(Timestamp value) {
+      this.pauseDate = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder resumeDate(Timestamp value) {
+      this.resumeDate = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder contractTermBillingCycleOnRenewal(Integer value) {
+      this.contractTermBillingCycleOnRenewal = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder createCurrentTermInvoice(Boolean value) {
+      this.createCurrentTermInvoice = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder transaction(TransactionParams value) {
+      this.transaction = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder eventBasedAddons(
+        List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    public SubscriptionImportForCustomerBuilder chargedEventBasedAddons(
+        List<ChargedEventBasedAddonsParams> value) {
+      this.chargedEventBasedAddons = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionImportForCustomerBuilder coupons(List<CouponsParams> value) {
+      this.coupons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public SubscriptionImportForCustomerBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public SubscriptionImportForCustomerBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public SubscriptionImportForCustomerParams build() {
+      return new SubscriptionImportForCustomerParams(this);
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Status {
+    FUTURE("future"),
+
+    IN_TRIAL("in_trial"),
+
+    ACTIVE("active"),
+
+    NON_RENEWING("non_renewing"),
+
+    PAUSED("paused"),
+
+    CANCELLED("cancelled"),
+
+    TRANSFERRED("transferred"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final String id;
+
+    private final Timestamp createdAt;
+
+    private final Timestamp contractStart;
+
+    private final Integer billingCycle;
+
+    private final Long totalAmountRaised;
+
+    private final Long totalAmountRaisedBeforeTax;
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.id = builder.id;
+
+      this.createdAt = builder.createdAt;
+
+      this.contractStart = builder.contractStart;
+
+      this.billingCycle = builder.billingCycle;
+
+      this.totalAmountRaised = builder.totalAmountRaised;
+
+      this.totalAmountRaisedBeforeTax = builder.totalAmountRaisedBeforeTax;
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getCreatedAt() {
+      return createdAt;
+    }
+
+    public Timestamp getContractStart() {
+      return contractStart;
+    }
+
+    public Integer getBillingCycle() {
+      return billingCycle;
+    }
+
+    public Long getTotalAmountRaised() {
+      return totalAmountRaised;
+    }
+
+    public Long getTotalAmountRaisedBeforeTax() {
+      return totalAmountRaisedBeforeTax;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.createdAt != null) {
+
+        formData.put("created_at", this.createdAt);
+      }
+
+      if (this.contractStart != null) {
+
+        formData.put("contract_start", this.contractStart);
+      }
+
+      if (this.billingCycle != null) {
+
+        formData.put("billing_cycle", this.billingCycle);
+      }
+
+      if (this.totalAmountRaised != null) {
+
+        formData.put("total_amount_raised", this.totalAmountRaised);
+      }
+
+      if (this.totalAmountRaisedBeforeTax != null) {
+
+        formData.put("total_amount_raised_before_tax", this.totalAmountRaisedBeforeTax);
+      }
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private String id;
+
+      private Timestamp createdAt;
+
+      private Timestamp contractStart;
+
+      private Integer billingCycle;
+
+      private Long totalAmountRaised;
+
+      private Long totalAmountRaisedBeforeTax;
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public ContractTermBuilder createdAt(Timestamp value) {
+        this.createdAt = value;
+        return this;
+      }
+
+      public ContractTermBuilder contractStart(Timestamp value) {
+        this.contractStart = value;
+        return this;
+      }
+
+      public ContractTermBuilder billingCycle(Integer value) {
+        this.billingCycle = value;
+        return this;
+      }
+
+      public ContractTermBuilder totalAmountRaised(Long value) {
+        this.totalAmountRaised = value;
+        return this;
+      }
+
+      public ContractTermBuilder totalAmountRaisedBeforeTax(Long value) {
+        this.totalAmountRaisedBeforeTax = value;
+        return this;
+      }
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TransactionParams {
+
+    private final Long amount;
+
+    private final PaymentMethod paymentMethod;
+
+    private final String referenceNumber;
+
+    private final Timestamp date;
+
+    private TransactionParams(TransactionBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.paymentMethod = builder.paymentMethod;
+
+      this.referenceNumber = builder.referenceNumber;
+
+      this.date = builder.date;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public PaymentMethod getPaymentMethod() {
+      return paymentMethod;
+    }
+
+    public String getReferenceNumber() {
+      return referenceNumber;
+    }
+
+    public Timestamp getDate() {
+      return date;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.paymentMethod != null) {
+
+        formData.put("payment_method", this.paymentMethod);
+      }
+
+      if (this.referenceNumber != null) {
+
+        formData.put("reference_number", this.referenceNumber);
+      }
+
+      if (this.date != null) {
+
+        formData.put("date", this.date);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TransactionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TransactionBuilder builder() {
+      return new TransactionBuilder();
+    }
+
+    public static final class TransactionBuilder {
+
+      private Long amount;
+
+      private PaymentMethod paymentMethod;
+
+      private String referenceNumber;
+
+      private Timestamp date;
+
+      private TransactionBuilder() {}
+
+      public TransactionBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public TransactionBuilder paymentMethod(PaymentMethod value) {
+        this.paymentMethod = value;
+        return this;
+      }
+
+      public TransactionBuilder referenceNumber(String value) {
+        this.referenceNumber = value;
+        return this;
+      }
+
+      public TransactionBuilder date(Timestamp value) {
+        this.date = value;
+        return this;
+      }
+
+      public TransactionParams build() {
+        return new TransactionParams(this);
+      }
+    }
+
+    public enum PaymentMethod {
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      OTHER("other"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethod enumValue : PaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer servicePeriodInDays;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Integer servicePeriodInDays;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChargedEventBasedAddonsParams {
+
+    private final String id;
+
+    private final Timestamp lastChargedAt;
+
+    private ChargedEventBasedAddonsParams(ChargedEventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.lastChargedAt = builder.lastChargedAt;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getLastChargedAt() {
+      return lastChargedAt;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.lastChargedAt != null) {
+
+        formData.put("last_charged_at", this.lastChargedAt);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargedEventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargedEventBasedAddonsBuilder builder() {
+      return new ChargedEventBasedAddonsBuilder();
+    }
+
+    public static final class ChargedEventBasedAddonsBuilder {
+
+      private String id;
+
+      private Timestamp lastChargedAt;
+
+      private ChargedEventBasedAddonsBuilder() {}
+
+      public ChargedEventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public ChargedEventBasedAddonsBuilder lastChargedAt(Timestamp value) {
+        this.lastChargedAt = value;
+        return this;
+      }
+
+      public ChargedEventBasedAddonsParams build() {
+        return new ChargedEventBasedAddonsParams(this);
+      }
+    }
+  }
+
+  public static final class CouponsParams {
+
+    private final String couponId;
+
+    private final Timestamp applyTill;
+
+    private CouponsParams(CouponsBuilder builder) {
+
+      this.couponId = builder.couponId;
+
+      this.applyTill = builder.applyTill;
+    }
+
+    public String getCouponId() {
+      return couponId;
+    }
+
+    public Timestamp getApplyTill() {
+      return applyTill;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.couponId != null) {
+
+        formData.put("coupon_id", this.couponId);
+      }
+
+      if (this.applyTill != null) {
+
+        formData.put("apply_till", this.applyTill);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsBuilder builder() {
+      return new CouponsBuilder();
+    }
+
+    public static final class CouponsBuilder {
+
+      private String couponId;
+
+      private Timestamp applyTill;
+
+      private CouponsBuilder() {}
+
+      public CouponsBuilder couponId(String value) {
+        this.couponId = value;
+        return this;
+      }
+
+      public CouponsBuilder applyTill(Timestamp value) {
+        this.applyTill = value;
+        return this;
+      }
+
+      public CouponsParams build() {
+        return new CouponsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionImportForItemsParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionImportForItemsParams.java
new file mode 100644
index 00000000..71c5ac6f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionImportForItemsParams.java
@@ -0,0 +1,2620 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class SubscriptionImportForItemsParams {
+
+  private final List<String> exhaustedCouponIds;
+
+  private final String id;
+
+  private final Timestamp trialEnd;
+
+  private final Integer billingCycles;
+
+  private final Long setupFee;
+
+  private final Integer netTermDays;
+
+  private final Timestamp startDate;
+
+  private final AutoCollection autoCollection;
+
+  private final String poNumber;
+
+  private final List<String> couponIds;
+
+  private final String paymentSourceId;
+
+  private final Status status;
+
+  private final Timestamp currentTermEnd;
+
+  private final Timestamp currentTermStart;
+
+  private final Timestamp trialStart;
+
+  private final Timestamp cancelledAt;
+
+  private final Timestamp startedAt;
+
+  private final Timestamp activatedAt;
+
+  private final Timestamp pauseDate;
+
+  private final Timestamp resumeDate;
+
+  private final Integer contractTermBillingCycleOnRenewal;
+
+  private final Boolean createCurrentTermInvoice;
+
+  private final String invoiceNotes;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final String cancelReasonCode;
+
+  private final Boolean createPendingInvoices;
+
+  private final Boolean autoCloseInvoices;
+
+  private final ContractTermParams contractTerm;
+
+  private final TransactionParams transaction;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<ChargedItemsParams> chargedItems;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<CouponsParams> coupons;
+
+  private final Map<String, String> customFields;
+
+  private SubscriptionImportForItemsParams(SubscriptionImportForItemsBuilder builder) {
+
+    this.exhaustedCouponIds = builder.exhaustedCouponIds;
+
+    this.id = builder.id;
+
+    this.trialEnd = builder.trialEnd;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.setupFee = builder.setupFee;
+
+    this.netTermDays = builder.netTermDays;
+
+    this.startDate = builder.startDate;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.poNumber = builder.poNumber;
+
+    this.couponIds = builder.couponIds;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.status = builder.status;
+
+    this.currentTermEnd = builder.currentTermEnd;
+
+    this.currentTermStart = builder.currentTermStart;
+
+    this.trialStart = builder.trialStart;
+
+    this.cancelledAt = builder.cancelledAt;
+
+    this.startedAt = builder.startedAt;
+
+    this.activatedAt = builder.activatedAt;
+
+    this.pauseDate = builder.pauseDate;
+
+    this.resumeDate = builder.resumeDate;
+
+    this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+    this.createCurrentTermInvoice = builder.createCurrentTermInvoice;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.metaData = builder.metaData;
+
+    this.cancelReasonCode = builder.cancelReasonCode;
+
+    this.createPendingInvoices = builder.createPendingInvoices;
+
+    this.autoCloseInvoices = builder.autoCloseInvoices;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.transaction = builder.transaction;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.discounts = builder.discounts;
+
+    this.chargedItems = builder.chargedItems;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.coupons = builder.coupons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public List<String> getExhaustedCouponIds() {
+    return exhaustedCouponIds;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public Timestamp getTrialEnd() {
+    return trialEnd;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Long getSetupFee() {
+    return setupFee;
+  }
+
+  public Integer getNetTermDays() {
+    return netTermDays;
+  }
+
+  public Timestamp getStartDate() {
+    return startDate;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public Timestamp getCurrentTermEnd() {
+    return currentTermEnd;
+  }
+
+  public Timestamp getCurrentTermStart() {
+    return currentTermStart;
+  }
+
+  public Timestamp getTrialStart() {
+    return trialStart;
+  }
+
+  public Timestamp getCancelledAt() {
+    return cancelledAt;
+  }
+
+  public Timestamp getStartedAt() {
+    return startedAt;
+  }
+
+  public Timestamp getActivatedAt() {
+    return activatedAt;
+  }
+
+  public Timestamp getPauseDate() {
+    return pauseDate;
+  }
+
+  public Timestamp getResumeDate() {
+    return resumeDate;
+  }
+
+  public Integer getContractTermBillingCycleOnRenewal() {
+    return contractTermBillingCycleOnRenewal;
+  }
+
+  public Boolean getCreateCurrentTermInvoice() {
+    return createCurrentTermInvoice;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public String getCancelReasonCode() {
+    return cancelReasonCode;
+  }
+
+  public Boolean getCreatePendingInvoices() {
+    return createPendingInvoices;
+  }
+
+  public Boolean getAutoCloseInvoices() {
+    return autoCloseInvoices;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public TransactionParams getTransaction() {
+    return transaction;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<ChargedItemsParams> getChargedItems() {
+    return chargedItems;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<CouponsParams> getCoupons() {
+    return coupons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.exhaustedCouponIds != null) {
+
+      formData.put("exhausted_coupon_ids", this.exhaustedCouponIds);
+    }
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.trialEnd != null) {
+
+      formData.put("trial_end", this.trialEnd);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.setupFee != null) {
+
+      formData.put("setup_fee", this.setupFee);
+    }
+
+    if (this.netTermDays != null) {
+
+      formData.put("net_term_days", this.netTermDays);
+    }
+
+    if (this.startDate != null) {
+
+      formData.put("start_date", this.startDate);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.currentTermEnd != null) {
+
+      formData.put("current_term_end", this.currentTermEnd);
+    }
+
+    if (this.currentTermStart != null) {
+
+      formData.put("current_term_start", this.currentTermStart);
+    }
+
+    if (this.trialStart != null) {
+
+      formData.put("trial_start", this.trialStart);
+    }
+
+    if (this.cancelledAt != null) {
+
+      formData.put("cancelled_at", this.cancelledAt);
+    }
+
+    if (this.startedAt != null) {
+
+      formData.put("started_at", this.startedAt);
+    }
+
+    if (this.activatedAt != null) {
+
+      formData.put("activated_at", this.activatedAt);
+    }
+
+    if (this.pauseDate != null) {
+
+      formData.put("pause_date", this.pauseDate);
+    }
+
+    if (this.resumeDate != null) {
+
+      formData.put("resume_date", this.resumeDate);
+    }
+
+    if (this.contractTermBillingCycleOnRenewal != null) {
+
+      formData.put(
+          "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+    }
+
+    if (this.createCurrentTermInvoice != null) {
+
+      formData.put("create_current_term_invoice", this.createCurrentTermInvoice);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.cancelReasonCode != null) {
+
+      formData.put("cancel_reason_code", this.cancelReasonCode);
+    }
+
+    if (this.createPendingInvoices != null) {
+
+      formData.put("create_pending_invoices", this.createPendingInvoices);
+    }
+
+    if (this.autoCloseInvoices != null) {
+
+      formData.put("auto_close_invoices", this.autoCloseInvoices);
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.transaction != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.transaction.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "transaction[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.chargedItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.chargedItems.size(); i++) {
+        ChargedItemsParams item = this.chargedItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charged_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.coupons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.coupons.size(); i++) {
+        CouponsParams item = this.coupons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionImportForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionImportForItemsBuilder builder() {
+    return new SubscriptionImportForItemsBuilder();
+  }
+
+  public static final class SubscriptionImportForItemsBuilder {
+
+    private List<String> exhaustedCouponIds;
+
+    private String id;
+
+    private Timestamp trialEnd;
+
+    private Integer billingCycles;
+
+    private Long setupFee;
+
+    private Integer netTermDays;
+
+    private Timestamp startDate;
+
+    private AutoCollection autoCollection;
+
+    private String poNumber;
+
+    private List<String> couponIds;
+
+    private String paymentSourceId;
+
+    private Status status;
+
+    private Timestamp currentTermEnd;
+
+    private Timestamp currentTermStart;
+
+    private Timestamp trialStart;
+
+    private Timestamp cancelledAt;
+
+    private Timestamp startedAt;
+
+    private Timestamp activatedAt;
+
+    private Timestamp pauseDate;
+
+    private Timestamp resumeDate;
+
+    private Integer contractTermBillingCycleOnRenewal;
+
+    private Boolean createCurrentTermInvoice;
+
+    private String invoiceNotes;
+
+    private java.util.Map<String, Object> metaData;
+
+    private String cancelReasonCode;
+
+    private Boolean createPendingInvoices;
+
+    private Boolean autoCloseInvoices;
+
+    private ContractTermParams contractTerm;
+
+    private TransactionParams transaction;
+
+    private ShippingAddressParams shippingAddress;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<DiscountsParams> discounts;
+
+    private List<ChargedItemsParams> chargedItems;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<CouponsParams> coupons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private SubscriptionImportForItemsBuilder() {}
+
+    public SubscriptionImportForItemsBuilder exhaustedCouponIds(List<String> value) {
+      this.exhaustedCouponIds = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder trialEnd(Timestamp value) {
+      this.trialEnd = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionImportForItemsBuilder setupFee(Long value) {
+      this.setupFee = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder netTermDays(Integer value) {
+      this.netTermDays = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder startDate(Timestamp value) {
+      this.startDate = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder currentTermEnd(Timestamp value) {
+      this.currentTermEnd = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder currentTermStart(Timestamp value) {
+      this.currentTermStart = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder trialStart(Timestamp value) {
+      this.trialStart = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder cancelledAt(Timestamp value) {
+      this.cancelledAt = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder startedAt(Timestamp value) {
+      this.startedAt = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder activatedAt(Timestamp value) {
+      this.activatedAt = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder pauseDate(Timestamp value) {
+      this.pauseDate = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder resumeDate(Timestamp value) {
+      this.resumeDate = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder contractTermBillingCycleOnRenewal(Integer value) {
+      this.contractTermBillingCycleOnRenewal = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder createCurrentTermInvoice(Boolean value) {
+      this.createCurrentTermInvoice = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder cancelReasonCode(String value) {
+      this.cancelReasonCode = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder createPendingInvoices(Boolean value) {
+      this.createPendingInvoices = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder autoCloseInvoices(Boolean value) {
+      this.autoCloseInvoices = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder transaction(TransactionParams value) {
+      this.transaction = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder chargedItems(List<ChargedItemsParams> value) {
+      this.chargedItems = value;
+      return this;
+    }
+
+    public SubscriptionImportForItemsBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionImportForItemsBuilder coupons(List<CouponsParams> value) {
+      this.coupons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public SubscriptionImportForItemsBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public SubscriptionImportForItemsBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public SubscriptionImportForItemsParams build() {
+      return new SubscriptionImportForItemsParams(this);
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Status {
+    FUTURE("future"),
+
+    IN_TRIAL("in_trial"),
+
+    ACTIVE("active"),
+
+    NON_RENEWING("non_renewing"),
+
+    PAUSED("paused"),
+
+    CANCELLED("cancelled"),
+
+    TRANSFERRED("transferred"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final String id;
+
+    private final Timestamp createdAt;
+
+    private final Timestamp contractStart;
+
+    private final Integer billingCycle;
+
+    private final Long totalAmountRaised;
+
+    private final Long totalAmountRaisedBeforeTax;
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.id = builder.id;
+
+      this.createdAt = builder.createdAt;
+
+      this.contractStart = builder.contractStart;
+
+      this.billingCycle = builder.billingCycle;
+
+      this.totalAmountRaised = builder.totalAmountRaised;
+
+      this.totalAmountRaisedBeforeTax = builder.totalAmountRaisedBeforeTax;
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getCreatedAt() {
+      return createdAt;
+    }
+
+    public Timestamp getContractStart() {
+      return contractStart;
+    }
+
+    public Integer getBillingCycle() {
+      return billingCycle;
+    }
+
+    public Long getTotalAmountRaised() {
+      return totalAmountRaised;
+    }
+
+    public Long getTotalAmountRaisedBeforeTax() {
+      return totalAmountRaisedBeforeTax;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.createdAt != null) {
+
+        formData.put("created_at", this.createdAt);
+      }
+
+      if (this.contractStart != null) {
+
+        formData.put("contract_start", this.contractStart);
+      }
+
+      if (this.billingCycle != null) {
+
+        formData.put("billing_cycle", this.billingCycle);
+      }
+
+      if (this.totalAmountRaised != null) {
+
+        formData.put("total_amount_raised", this.totalAmountRaised);
+      }
+
+      if (this.totalAmountRaisedBeforeTax != null) {
+
+        formData.put("total_amount_raised_before_tax", this.totalAmountRaisedBeforeTax);
+      }
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private String id;
+
+      private Timestamp createdAt;
+
+      private Timestamp contractStart;
+
+      private Integer billingCycle;
+
+      private Long totalAmountRaised;
+
+      private Long totalAmountRaisedBeforeTax;
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public ContractTermBuilder createdAt(Timestamp value) {
+        this.createdAt = value;
+        return this;
+      }
+
+      public ContractTermBuilder contractStart(Timestamp value) {
+        this.contractStart = value;
+        return this;
+      }
+
+      public ContractTermBuilder billingCycle(Integer value) {
+        this.billingCycle = value;
+        return this;
+      }
+
+      public ContractTermBuilder totalAmountRaised(Long value) {
+        this.totalAmountRaised = value;
+        return this;
+      }
+
+      public ContractTermBuilder totalAmountRaisedBeforeTax(Long value) {
+        this.totalAmountRaisedBeforeTax = value;
+        return this;
+      }
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TransactionParams {
+
+    private final Long amount;
+
+    private final PaymentMethod paymentMethod;
+
+    private final String referenceNumber;
+
+    private final Timestamp date;
+
+    private TransactionParams(TransactionBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.paymentMethod = builder.paymentMethod;
+
+      this.referenceNumber = builder.referenceNumber;
+
+      this.date = builder.date;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public PaymentMethod getPaymentMethod() {
+      return paymentMethod;
+    }
+
+    public String getReferenceNumber() {
+      return referenceNumber;
+    }
+
+    public Timestamp getDate() {
+      return date;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.paymentMethod != null) {
+
+        formData.put("payment_method", this.paymentMethod);
+      }
+
+      if (this.referenceNumber != null) {
+
+        formData.put("reference_number", this.referenceNumber);
+      }
+
+      if (this.date != null) {
+
+        formData.put("date", this.date);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TransactionParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TransactionBuilder builder() {
+      return new TransactionBuilder();
+    }
+
+    public static final class TransactionBuilder {
+
+      private Long amount;
+
+      private PaymentMethod paymentMethod;
+
+      private String referenceNumber;
+
+      private Timestamp date;
+
+      private TransactionBuilder() {}
+
+      public TransactionBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public TransactionBuilder paymentMethod(PaymentMethod value) {
+        this.paymentMethod = value;
+        return this;
+      }
+
+      public TransactionBuilder referenceNumber(String value) {
+        this.referenceNumber = value;
+        return this;
+      }
+
+      public TransactionBuilder date(Timestamp value) {
+        this.date = value;
+        return this;
+      }
+
+      public TransactionParams build() {
+        return new TransactionParams(this);
+      }
+    }
+
+    public enum PaymentMethod {
+      CASH("cash"),
+
+      CHECK("check"),
+
+      BANK_TRANSFER("bank_transfer"),
+
+      OTHER("other"),
+
+      APP_STORE("app_store"),
+
+      PLAY_STORE("play_store"),
+
+      CUSTOM("custom"),
+
+      /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethod enumValue : PaymentMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ItemType itemType;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.itemType = builder.itemType;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ItemType itemType;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChargedItemsParams {
+
+    private final String itemPriceId;
+
+    private final Timestamp lastChargedAt;
+
+    private ChargedItemsParams(ChargedItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.lastChargedAt = builder.lastChargedAt;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Timestamp getLastChargedAt() {
+      return lastChargedAt;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.lastChargedAt != null) {
+
+        formData.put("last_charged_at", this.lastChargedAt);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargedItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargedItemsBuilder builder() {
+      return new ChargedItemsBuilder();
+    }
+
+    public static final class ChargedItemsBuilder {
+
+      private String itemPriceId;
+
+      private Timestamp lastChargedAt;
+
+      private ChargedItemsBuilder() {}
+
+      public ChargedItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ChargedItemsBuilder lastChargedAt(Timestamp value) {
+        this.lastChargedAt = value;
+        return this;
+      }
+
+      public ChargedItemsParams build() {
+        return new ChargedItemsParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponsParams {
+
+    private final String couponId;
+
+    private final Timestamp applyTill;
+
+    private CouponsParams(CouponsBuilder builder) {
+
+      this.couponId = builder.couponId;
+
+      this.applyTill = builder.applyTill;
+    }
+
+    public String getCouponId() {
+      return couponId;
+    }
+
+    public Timestamp getApplyTill() {
+      return applyTill;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.couponId != null) {
+
+        formData.put("coupon_id", this.couponId);
+      }
+
+      if (this.applyTill != null) {
+
+        formData.put("apply_till", this.applyTill);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsBuilder builder() {
+      return new CouponsBuilder();
+    }
+
+    public static final class CouponsBuilder {
+
+      private String couponId;
+
+      private Timestamp applyTill;
+
+      private CouponsBuilder() {}
+
+      public CouponsBuilder couponId(String value) {
+        this.couponId = value;
+        return this;
+      }
+
+      public CouponsBuilder applyTill(Timestamp value) {
+        this.applyTill = value;
+        return this;
+      }
+
+      public CouponsParams build() {
+        return new CouponsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionImportUnbilledChargesParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionImportUnbilledChargesParams.java
new file mode 100644
index 00000000..79572b13
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionImportUnbilledChargesParams.java
@@ -0,0 +1,868 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class SubscriptionImportUnbilledChargesParams {
+
+  private final List<UnbilledChargesParams> unbilledCharges;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<TiersParams> tiers;
+
+  private SubscriptionImportUnbilledChargesParams(
+      SubscriptionImportUnbilledChargesBuilder builder) {
+
+    this.unbilledCharges = builder.unbilledCharges;
+
+    this.discounts = builder.discounts;
+
+    this.tiers = builder.tiers;
+  }
+
+  public List<UnbilledChargesParams> getUnbilledCharges() {
+    return unbilledCharges;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<TiersParams> getTiers() {
+    return tiers;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.unbilledCharges != null) {
+
+      // List of objects
+      for (int i = 0; i < this.unbilledCharges.size(); i++) {
+        UnbilledChargesParams item = this.unbilledCharges.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "unbilled_charges[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.tiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.tiers.size(); i++) {
+        TiersParams item = this.tiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionImportUnbilledChargesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionImportUnbilledChargesBuilder builder() {
+    return new SubscriptionImportUnbilledChargesBuilder();
+  }
+
+  public static final class SubscriptionImportUnbilledChargesBuilder {
+
+    private List<UnbilledChargesParams> unbilledCharges;
+
+    private List<DiscountsParams> discounts;
+
+    private List<TiersParams> tiers;
+
+    private SubscriptionImportUnbilledChargesBuilder() {}
+
+    public SubscriptionImportUnbilledChargesBuilder unbilledCharges(
+        List<UnbilledChargesParams> value) {
+      this.unbilledCharges = value;
+      return this;
+    }
+
+    public SubscriptionImportUnbilledChargesBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public SubscriptionImportUnbilledChargesBuilder tiers(List<TiersParams> value) {
+      this.tiers = value;
+      return this;
+    }
+
+    public SubscriptionImportUnbilledChargesParams build() {
+      return new SubscriptionImportUnbilledChargesParams(this);
+    }
+  }
+
+  public static final class UnbilledChargesParams {
+
+    private final String id;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private final EntityType entityType;
+
+    private final String entityId;
+
+    private final String description;
+
+    private final Long unitAmount;
+
+    private final Integer quantity;
+
+    private final Long amount;
+
+    private final String unitAmountInDecimal;
+
+    private final String quantityInDecimal;
+
+    private final String amountInDecimal;
+
+    private final Long discountAmount;
+
+    private final Boolean useForProration;
+
+    private final Boolean isAdvanceCharge;
+
+    private UnbilledChargesParams(UnbilledChargesBuilder builder) {
+
+      this.id = builder.id;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+
+      this.entityType = builder.entityType;
+
+      this.entityId = builder.entityId;
+
+      this.description = builder.description;
+
+      this.unitAmount = builder.unitAmount;
+
+      this.quantity = builder.quantity;
+
+      this.amount = builder.amount;
+
+      this.unitAmountInDecimal = builder.unitAmountInDecimal;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.discountAmount = builder.discountAmount;
+
+      this.useForProration = builder.useForProration;
+
+      this.isAdvanceCharge = builder.isAdvanceCharge;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Long getUnitAmount() {
+      return unitAmount;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getUnitAmountInDecimal() {
+      return unitAmountInDecimal;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public Long getDiscountAmount() {
+      return discountAmount;
+    }
+
+    public Boolean getUseForProration() {
+      return useForProration;
+    }
+
+    public Boolean getIsAdvanceCharge() {
+      return isAdvanceCharge;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.unitAmount != null) {
+
+        formData.put("unit_amount", this.unitAmount);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.unitAmountInDecimal != null) {
+
+        formData.put("unit_amount_in_decimal", this.unitAmountInDecimal);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.discountAmount != null) {
+
+        formData.put("discount_amount", this.discountAmount);
+      }
+
+      if (this.useForProration != null) {
+
+        formData.put("use_for_proration", this.useForProration);
+      }
+
+      if (this.isAdvanceCharge != null) {
+
+        formData.put("is_advance_charge", this.isAdvanceCharge);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for UnbilledChargesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static UnbilledChargesBuilder builder() {
+      return new UnbilledChargesBuilder();
+    }
+
+    public static final class UnbilledChargesBuilder {
+
+      private String id;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private EntityType entityType;
+
+      private String entityId;
+
+      private String description;
+
+      private Long unitAmount;
+
+      private Integer quantity;
+
+      private Long amount;
+
+      private String unitAmountInDecimal;
+
+      private String quantityInDecimal;
+
+      private String amountInDecimal;
+
+      private Long discountAmount;
+
+      private Boolean useForProration;
+
+      private Boolean isAdvanceCharge;
+
+      private UnbilledChargesBuilder() {}
+
+      public UnbilledChargesBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder unitAmount(Long value) {
+        this.unitAmount = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder unitAmountInDecimal(String value) {
+        this.unitAmountInDecimal = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder discountAmount(Long value) {
+        this.discountAmount = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder useForProration(Boolean value) {
+        this.useForProration = value;
+        return this;
+      }
+
+      public UnbilledChargesBuilder isAdvanceCharge(Boolean value) {
+        this.isAdvanceCharge = value;
+        return this;
+      }
+
+      public UnbilledChargesParams build() {
+        return new UnbilledChargesParams(this);
+      }
+    }
+
+    public enum EntityType {
+      ADHOC("adhoc"),
+
+      PLAN_ITEM_PRICE("plan_item_price"),
+
+      ADDON_ITEM_PRICE("addon_item_price"),
+
+      CHARGE_ITEM_PRICE("charge_item_price"),
+
+      PLAN_SETUP("plan_setup"),
+
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final String unbilledChargeId;
+
+    private final EntityType entityType;
+
+    private final String entityId;
+
+    private final String description;
+
+    private final Long amount;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.unbilledChargeId = builder.unbilledChargeId;
+
+      this.entityType = builder.entityType;
+
+      this.entityId = builder.entityId;
+
+      this.description = builder.description;
+
+      this.amount = builder.amount;
+    }
+
+    public String getUnbilledChargeId() {
+      return unbilledChargeId;
+    }
+
+    public EntityType getEntityType() {
+      return entityType;
+    }
+
+    public String getEntityId() {
+      return entityId;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.unbilledChargeId != null) {
+
+        formData.put("unbilled_charge_id", this.unbilledChargeId);
+      }
+
+      if (this.entityType != null) {
+
+        formData.put("entity_type", this.entityType);
+      }
+
+      if (this.entityId != null) {
+
+        formData.put("entity_id", this.entityId);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private String unbilledChargeId;
+
+      private EntityType entityType;
+
+      private String entityId;
+
+      private String description;
+
+      private Long amount;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder unbilledChargeId(String value) {
+        this.unbilledChargeId = value;
+        return this;
+      }
+
+      public DiscountsBuilder entityType(EntityType value) {
+        this.entityType = value;
+        return this;
+      }
+
+      public DiscountsBuilder entityId(String value) {
+        this.entityId = value;
+        return this;
+      }
+
+      public DiscountsBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum EntityType {
+      ITEM_LEVEL_COUPON("item_level_coupon"),
+
+      DOCUMENT_LEVEL_COUPON("document_level_coupon"),
+
+      ITEM_LEVEL_DISCOUNT("item_level_discount"),
+
+      DOCUMENT_LEVEL_DISCOUNT("document_level_discount"),
+
+      /** An enum member indicating that EntityType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EntityType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EntityType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EntityType enumValue : EntityType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TiersParams {
+
+    private final String unbilledChargeId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Integer quantityUsed;
+
+    private final Long unitAmount;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String quantityUsedInDecimal;
+
+    private final String unitAmountInDecimal;
+
+    private TiersParams(TiersBuilder builder) {
+
+      this.unbilledChargeId = builder.unbilledChargeId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.quantityUsed = builder.quantityUsed;
+
+      this.unitAmount = builder.unitAmount;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.quantityUsedInDecimal = builder.quantityUsedInDecimal;
+
+      this.unitAmountInDecimal = builder.unitAmountInDecimal;
+    }
+
+    public String getUnbilledChargeId() {
+      return unbilledChargeId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Integer getQuantityUsed() {
+      return quantityUsed;
+    }
+
+    public Long getUnitAmount() {
+      return unitAmount;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getQuantityUsedInDecimal() {
+      return quantityUsedInDecimal;
+    }
+
+    public String getUnitAmountInDecimal() {
+      return unitAmountInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.unbilledChargeId != null) {
+
+        formData.put("unbilled_charge_id", this.unbilledChargeId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.quantityUsed != null) {
+
+        formData.put("quantity_used", this.quantityUsed);
+      }
+
+      if (this.unitAmount != null) {
+
+        formData.put("unit_amount", this.unitAmount);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.quantityUsedInDecimal != null) {
+
+        formData.put("quantity_used_in_decimal", this.quantityUsedInDecimal);
+      }
+
+      if (this.unitAmountInDecimal != null) {
+
+        formData.put("unit_amount_in_decimal", this.unitAmountInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TiersBuilder builder() {
+      return new TiersBuilder();
+    }
+
+    public static final class TiersBuilder {
+
+      private String unbilledChargeId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Integer quantityUsed;
+
+      private Long unitAmount;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String quantityUsedInDecimal;
+
+      private String unitAmountInDecimal;
+
+      private TiersBuilder() {}
+
+      public TiersBuilder unbilledChargeId(String value) {
+        this.unbilledChargeId = value;
+        return this;
+      }
+
+      public TiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public TiersBuilder quantityUsed(Integer value) {
+        this.quantityUsed = value;
+        return this;
+      }
+
+      public TiersBuilder unitAmount(Long value) {
+        this.unitAmount = value;
+        return this;
+      }
+
+      public TiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder quantityUsedInDecimal(String value) {
+        this.quantityUsedInDecimal = value;
+        return this;
+      }
+
+      public TiersBuilder unitAmountInDecimal(String value) {
+        this.unitAmountInDecimal = value;
+        return this;
+      }
+
+      public TiersParams build() {
+        return new TiersParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionListDiscountsParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionListDiscountsParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionListDiscountsParams.java
rename to src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionListDiscountsParams.java
index dbdbbcef..977e5c1c 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionListDiscountsParams.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionListDiscountsParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscription.params;
+package com.chargebee.v4.models.subscription.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionListParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionListParams.java
rename to src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionListParams.java
index afd89cdb..7e5565c8 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionListParams.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscription.params;
+package com.chargebee.v4.models.subscription.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionMoveParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionMoveParams.java
new file mode 100644
index 00000000..1a882b6f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionMoveParams.java
@@ -0,0 +1,80 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class SubscriptionMoveParams {
+
+  private final String toCustomerId;
+
+  private final Boolean copyPaymentSource;
+
+  private SubscriptionMoveParams(SubscriptionMoveBuilder builder) {
+
+    this.toCustomerId = builder.toCustomerId;
+
+    this.copyPaymentSource = builder.copyPaymentSource;
+  }
+
+  public String getToCustomerId() {
+    return toCustomerId;
+  }
+
+  public Boolean getCopyPaymentSource() {
+    return copyPaymentSource;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.toCustomerId != null) {
+
+      formData.put("to_customer_id", this.toCustomerId);
+    }
+
+    if (this.copyPaymentSource != null) {
+
+      formData.put("copy_payment_source", this.copyPaymentSource);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionMoveParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionMoveBuilder builder() {
+    return new SubscriptionMoveBuilder();
+  }
+
+  public static final class SubscriptionMoveBuilder {
+
+    private String toCustomerId;
+
+    private Boolean copyPaymentSource;
+
+    private SubscriptionMoveBuilder() {}
+
+    public SubscriptionMoveBuilder toCustomerId(String value) {
+      this.toCustomerId = value;
+      return this;
+    }
+
+    public SubscriptionMoveBuilder copyPaymentSource(Boolean value) {
+      this.copyPaymentSource = value;
+      return this;
+    }
+
+    public SubscriptionMoveParams build() {
+      return new SubscriptionMoveParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionOverrideBillingProfileParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionOverrideBillingProfileParams.java
new file mode 100644
index 00000000..d6b75935
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionOverrideBillingProfileParams.java
@@ -0,0 +1,109 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class SubscriptionOverrideBillingProfileParams {
+
+  private final String paymentSourceId;
+
+  private final AutoCollection autoCollection;
+
+  private SubscriptionOverrideBillingProfileParams(
+      SubscriptionOverrideBillingProfileBuilder builder) {
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.autoCollection = builder.autoCollection;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionOverrideBillingProfileParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionOverrideBillingProfileBuilder builder() {
+    return new SubscriptionOverrideBillingProfileBuilder();
+  }
+
+  public static final class SubscriptionOverrideBillingProfileBuilder {
+
+    private String paymentSourceId;
+
+    private AutoCollection autoCollection;
+
+    private SubscriptionOverrideBillingProfileBuilder() {}
+
+    public SubscriptionOverrideBillingProfileBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public SubscriptionOverrideBillingProfileBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public SubscriptionOverrideBillingProfileParams build() {
+      return new SubscriptionOverrideBillingProfileParams(this);
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionPauseParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionPauseParams.java
new file mode 100644
index 00000000..9233c07d
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionPauseParams.java
@@ -0,0 +1,254 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class SubscriptionPauseParams {
+
+  private final PauseOption pauseOption;
+
+  private final Timestamp pauseDate;
+
+  private final UnbilledChargesHandling unbilledChargesHandling;
+
+  private final InvoiceDunningHandling invoiceDunningHandling;
+
+  private final Integer skipBillingCycles;
+
+  private final Timestamp resumeDate;
+
+  private SubscriptionPauseParams(SubscriptionPauseBuilder builder) {
+
+    this.pauseOption = builder.pauseOption;
+
+    this.pauseDate = builder.pauseDate;
+
+    this.unbilledChargesHandling = builder.unbilledChargesHandling;
+
+    this.invoiceDunningHandling = builder.invoiceDunningHandling;
+
+    this.skipBillingCycles = builder.skipBillingCycles;
+
+    this.resumeDate = builder.resumeDate;
+  }
+
+  public PauseOption getPauseOption() {
+    return pauseOption;
+  }
+
+  public Timestamp getPauseDate() {
+    return pauseDate;
+  }
+
+  public UnbilledChargesHandling getUnbilledChargesHandling() {
+    return unbilledChargesHandling;
+  }
+
+  public InvoiceDunningHandling getInvoiceDunningHandling() {
+    return invoiceDunningHandling;
+  }
+
+  public Integer getSkipBillingCycles() {
+    return skipBillingCycles;
+  }
+
+  public Timestamp getResumeDate() {
+    return resumeDate;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.pauseOption != null) {
+
+      formData.put("pause_option", this.pauseOption);
+    }
+
+    if (this.pauseDate != null) {
+
+      formData.put("pause_date", this.pauseDate);
+    }
+
+    if (this.unbilledChargesHandling != null) {
+
+      formData.put("unbilled_charges_handling", this.unbilledChargesHandling);
+    }
+
+    if (this.invoiceDunningHandling != null) {
+
+      formData.put("invoice_dunning_handling", this.invoiceDunningHandling);
+    }
+
+    if (this.skipBillingCycles != null) {
+
+      formData.put("skip_billing_cycles", this.skipBillingCycles);
+    }
+
+    if (this.resumeDate != null) {
+
+      formData.put("resume_date", this.resumeDate);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionPauseParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionPauseBuilder builder() {
+    return new SubscriptionPauseBuilder();
+  }
+
+  public static final class SubscriptionPauseBuilder {
+
+    private PauseOption pauseOption;
+
+    private Timestamp pauseDate;
+
+    private UnbilledChargesHandling unbilledChargesHandling;
+
+    private InvoiceDunningHandling invoiceDunningHandling;
+
+    private Integer skipBillingCycles;
+
+    private Timestamp resumeDate;
+
+    private SubscriptionPauseBuilder() {}
+
+    public SubscriptionPauseBuilder pauseOption(PauseOption value) {
+      this.pauseOption = value;
+      return this;
+    }
+
+    public SubscriptionPauseBuilder pauseDate(Timestamp value) {
+      this.pauseDate = value;
+      return this;
+    }
+
+    public SubscriptionPauseBuilder unbilledChargesHandling(UnbilledChargesHandling value) {
+      this.unbilledChargesHandling = value;
+      return this;
+    }
+
+    public SubscriptionPauseBuilder invoiceDunningHandling(InvoiceDunningHandling value) {
+      this.invoiceDunningHandling = value;
+      return this;
+    }
+
+    public SubscriptionPauseBuilder skipBillingCycles(Integer value) {
+      this.skipBillingCycles = value;
+      return this;
+    }
+
+    public SubscriptionPauseBuilder resumeDate(Timestamp value) {
+      this.resumeDate = value;
+      return this;
+    }
+
+    public SubscriptionPauseParams build() {
+      return new SubscriptionPauseParams(this);
+    }
+  }
+
+  public enum PauseOption {
+    IMMEDIATELY("immediately"),
+
+    END_OF_TERM("end_of_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    BILLING_CYCLES("billing_cycles"),
+
+    /** An enum member indicating that PauseOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PauseOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PauseOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PauseOption enumValue : PauseOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum UnbilledChargesHandling {
+    NO_ACTION("no_action"),
+
+    INVOICE("invoice"),
+
+    /**
+     * An enum member indicating that UnbilledChargesHandling was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    UnbilledChargesHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static UnbilledChargesHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (UnbilledChargesHandling enumValue : UnbilledChargesHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum InvoiceDunningHandling {
+    CONTINUE("continue"),
+
+    STOP("stop"),
+
+    /**
+     * An enum member indicating that InvoiceDunningHandling was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    InvoiceDunningHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static InvoiceDunningHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (InvoiceDunningHandling enumValue : InvoiceDunningHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionReactivateParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionReactivateParams.java
new file mode 100644
index 00000000..a2021f68
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionReactivateParams.java
@@ -0,0 +1,770 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class SubscriptionReactivateParams {
+
+  private final Timestamp trialEnd;
+
+  private final Integer billingCycles;
+
+  private final Integer trialPeriodDays;
+
+  private final Timestamp reactivateFrom;
+
+  private final Boolean invoiceImmediately;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final Integer termsToCharge;
+
+  private final Timestamp invoiceDate;
+
+  private final Integer contractTermBillingCycleOnRenewal;
+
+  private final PaymentInitiator paymentInitiator;
+
+  private final ContractTermParams contractTerm;
+
+  private final StatementDescriptorParams statementDescriptor;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private SubscriptionReactivateParams(SubscriptionReactivateBuilder builder) {
+
+    this.trialEnd = builder.trialEnd;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.trialPeriodDays = builder.trialPeriodDays;
+
+    this.reactivateFrom = builder.reactivateFrom;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+    this.paymentInitiator = builder.paymentInitiator;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.statementDescriptor = builder.statementDescriptor;
+
+    this.paymentIntent = builder.paymentIntent;
+  }
+
+  public Timestamp getTrialEnd() {
+    return trialEnd;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Integer getTrialPeriodDays() {
+    return trialPeriodDays;
+  }
+
+  public Timestamp getReactivateFrom() {
+    return reactivateFrom;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public Integer getContractTermBillingCycleOnRenewal() {
+    return contractTermBillingCycleOnRenewal;
+  }
+
+  public PaymentInitiator getPaymentInitiator() {
+    return paymentInitiator;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public StatementDescriptorParams getStatementDescriptor() {
+    return statementDescriptor;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.trialEnd != null) {
+
+      formData.put("trial_end", this.trialEnd);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.trialPeriodDays != null) {
+
+      formData.put("trial_period_days", this.trialPeriodDays);
+    }
+
+    if (this.reactivateFrom != null) {
+
+      formData.put("reactivate_from", this.reactivateFrom);
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.contractTermBillingCycleOnRenewal != null) {
+
+      formData.put(
+          "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+    }
+
+    if (this.paymentInitiator != null) {
+
+      formData.put("payment_initiator", this.paymentInitiator);
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.statementDescriptor != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.statementDescriptor.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionReactivateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionReactivateBuilder builder() {
+    return new SubscriptionReactivateBuilder();
+  }
+
+  public static final class SubscriptionReactivateBuilder {
+
+    private Timestamp trialEnd;
+
+    private Integer billingCycles;
+
+    private Integer trialPeriodDays;
+
+    private Timestamp reactivateFrom;
+
+    private Boolean invoiceImmediately;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private Integer termsToCharge;
+
+    private Timestamp invoiceDate;
+
+    private Integer contractTermBillingCycleOnRenewal;
+
+    private PaymentInitiator paymentInitiator;
+
+    private ContractTermParams contractTerm;
+
+    private StatementDescriptorParams statementDescriptor;
+
+    private PaymentIntentParams paymentIntent;
+
+    private SubscriptionReactivateBuilder() {}
+
+    public SubscriptionReactivateBuilder trialEnd(Timestamp value) {
+      this.trialEnd = value;
+      return this;
+    }
+
+    public SubscriptionReactivateBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionReactivateBuilder trialPeriodDays(Integer value) {
+      this.trialPeriodDays = value;
+      return this;
+    }
+
+    public SubscriptionReactivateBuilder reactivateFrom(Timestamp value) {
+      this.reactivateFrom = value;
+      return this;
+    }
+
+    public SubscriptionReactivateBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public SubscriptionReactivateBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public SubscriptionReactivateBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public SubscriptionReactivateBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public SubscriptionReactivateBuilder contractTermBillingCycleOnRenewal(Integer value) {
+      this.contractTermBillingCycleOnRenewal = value;
+      return this;
+    }
+
+    public SubscriptionReactivateBuilder paymentInitiator(PaymentInitiator value) {
+      this.paymentInitiator = value;
+      return this;
+    }
+
+    public SubscriptionReactivateBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public SubscriptionReactivateBuilder statementDescriptor(StatementDescriptorParams value) {
+      this.statementDescriptor = value;
+      return this;
+    }
+
+    public SubscriptionReactivateBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public SubscriptionReactivateParams build() {
+      return new SubscriptionReactivateParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PaymentInitiator {
+    CUSTOMER("customer"),
+
+    MERCHANT("merchant"),
+
+    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentInitiator(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentInitiator fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatementDescriptorParams {
+
+    private final String descriptor;
+
+    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
+
+      this.descriptor = builder.descriptor;
+    }
+
+    public String getDescriptor() {
+      return descriptor;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.descriptor != null) {
+
+        formData.put("descriptor", this.descriptor);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatementDescriptorParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatementDescriptorBuilder builder() {
+      return new StatementDescriptorBuilder();
+    }
+
+    public static final class StatementDescriptorBuilder {
+
+      private String descriptor;
+
+      private StatementDescriptorBuilder() {}
+
+      public StatementDescriptorBuilder descriptor(String value) {
+        this.descriptor = value;
+        return this;
+      }
+
+      public StatementDescriptorParams build() {
+        return new StatementDescriptorParams(this);
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRegenerateInvoiceParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRegenerateInvoiceParams.java
new file mode 100644
index 00000000..0653e327
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRegenerateInvoiceParams.java
@@ -0,0 +1,121 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class SubscriptionRegenerateInvoiceParams {
+
+  private final Timestamp dateFrom;
+
+  private final Timestamp dateTo;
+
+  private final Boolean prorate;
+
+  private final Boolean invoiceImmediately;
+
+  private SubscriptionRegenerateInvoiceParams(SubscriptionRegenerateInvoiceBuilder builder) {
+
+    this.dateFrom = builder.dateFrom;
+
+    this.dateTo = builder.dateTo;
+
+    this.prorate = builder.prorate;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+  }
+
+  public Timestamp getDateFrom() {
+    return dateFrom;
+  }
+
+  public Timestamp getDateTo() {
+    return dateTo;
+  }
+
+  public Boolean getProrate() {
+    return prorate;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.dateFrom != null) {
+
+      formData.put("date_from", this.dateFrom);
+    }
+
+    if (this.dateTo != null) {
+
+      formData.put("date_to", this.dateTo);
+    }
+
+    if (this.prorate != null) {
+
+      formData.put("prorate", this.prorate);
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionRegenerateInvoiceParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionRegenerateInvoiceBuilder builder() {
+    return new SubscriptionRegenerateInvoiceBuilder();
+  }
+
+  public static final class SubscriptionRegenerateInvoiceBuilder {
+
+    private Timestamp dateFrom;
+
+    private Timestamp dateTo;
+
+    private Boolean prorate;
+
+    private Boolean invoiceImmediately;
+
+    private SubscriptionRegenerateInvoiceBuilder() {}
+
+    public SubscriptionRegenerateInvoiceBuilder dateFrom(Timestamp value) {
+      this.dateFrom = value;
+      return this;
+    }
+
+    public SubscriptionRegenerateInvoiceBuilder dateTo(Timestamp value) {
+      this.dateTo = value;
+      return this;
+    }
+
+    public SubscriptionRegenerateInvoiceBuilder prorate(Boolean value) {
+      this.prorate = value;
+      return this;
+    }
+
+    public SubscriptionRegenerateInvoiceBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public SubscriptionRegenerateInvoiceParams build() {
+      return new SubscriptionRegenerateInvoiceParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveAdvanceInvoiceScheduleParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveAdvanceInvoiceScheduleParams.java
new file mode 100644
index 00000000..58f2b221
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveAdvanceInvoiceScheduleParams.java
@@ -0,0 +1,121 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class SubscriptionRemoveAdvanceInvoiceScheduleParams {
+
+  private final List<SpecificDatesScheduleParams> specificDatesSchedule;
+
+  private SubscriptionRemoveAdvanceInvoiceScheduleParams(
+      SubscriptionRemoveAdvanceInvoiceScheduleBuilder builder) {
+
+    this.specificDatesSchedule = builder.specificDatesSchedule;
+  }
+
+  public List<SpecificDatesScheduleParams> getSpecificDatesSchedule() {
+    return specificDatesSchedule;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.specificDatesSchedule != null) {
+
+      // List of objects
+      for (int i = 0; i < this.specificDatesSchedule.size(); i++) {
+        SpecificDatesScheduleParams item = this.specificDatesSchedule.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "specific_dates_schedule[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionRemoveAdvanceInvoiceScheduleParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionRemoveAdvanceInvoiceScheduleBuilder builder() {
+    return new SubscriptionRemoveAdvanceInvoiceScheduleBuilder();
+  }
+
+  public static final class SubscriptionRemoveAdvanceInvoiceScheduleBuilder {
+
+    private List<SpecificDatesScheduleParams> specificDatesSchedule;
+
+    private SubscriptionRemoveAdvanceInvoiceScheduleBuilder() {}
+
+    public SubscriptionRemoveAdvanceInvoiceScheduleBuilder specificDatesSchedule(
+        List<SpecificDatesScheduleParams> value) {
+      this.specificDatesSchedule = value;
+      return this;
+    }
+
+    public SubscriptionRemoveAdvanceInvoiceScheduleParams build() {
+      return new SubscriptionRemoveAdvanceInvoiceScheduleParams(this);
+    }
+  }
+
+  public static final class SpecificDatesScheduleParams {
+
+    private final String id;
+
+    private SpecificDatesScheduleParams(SpecificDatesScheduleBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SpecificDatesScheduleParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SpecificDatesScheduleBuilder builder() {
+      return new SpecificDatesScheduleBuilder();
+    }
+
+    public static final class SpecificDatesScheduleBuilder {
+
+      private String id;
+
+      private SpecificDatesScheduleBuilder() {}
+
+      public SpecificDatesScheduleBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public SpecificDatesScheduleParams build() {
+        return new SpecificDatesScheduleParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveCouponsParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveCouponsParams.java
new file mode 100644
index 00000000..065933a8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveCouponsParams.java
@@ -0,0 +1,61 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class SubscriptionRemoveCouponsParams {
+
+  private final List<String> couponIds;
+
+  private SubscriptionRemoveCouponsParams(SubscriptionRemoveCouponsBuilder builder) {
+
+    this.couponIds = builder.couponIds;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionRemoveCouponsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionRemoveCouponsBuilder builder() {
+    return new SubscriptionRemoveCouponsBuilder();
+  }
+
+  public static final class SubscriptionRemoveCouponsBuilder {
+
+    private List<String> couponIds;
+
+    private SubscriptionRemoveCouponsBuilder() {}
+
+    public SubscriptionRemoveCouponsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public SubscriptionRemoveCouponsParams build() {
+      return new SubscriptionRemoveCouponsParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveScheduledCancellationParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveScheduledCancellationParams.java
new file mode 100644
index 00000000..c3a3fe86
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveScheduledCancellationParams.java
@@ -0,0 +1,206 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class SubscriptionRemoveScheduledCancellationParams {
+
+  private final Integer billingCycles;
+
+  private final Integer contractTermBillingCycleOnRenewal;
+
+  private final ContractTermParams contractTerm;
+
+  private SubscriptionRemoveScheduledCancellationParams(
+      SubscriptionRemoveScheduledCancellationBuilder builder) {
+
+    this.billingCycles = builder.billingCycles;
+
+    this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+    this.contractTerm = builder.contractTerm;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public Integer getContractTermBillingCycleOnRenewal() {
+    return contractTermBillingCycleOnRenewal;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.contractTermBillingCycleOnRenewal != null) {
+
+      formData.put(
+          "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionRemoveScheduledCancellationParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionRemoveScheduledCancellationBuilder builder() {
+    return new SubscriptionRemoveScheduledCancellationBuilder();
+  }
+
+  public static final class SubscriptionRemoveScheduledCancellationBuilder {
+
+    private Integer billingCycles;
+
+    private Integer contractTermBillingCycleOnRenewal;
+
+    private ContractTermParams contractTerm;
+
+    private SubscriptionRemoveScheduledCancellationBuilder() {}
+
+    public SubscriptionRemoveScheduledCancellationBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    public SubscriptionRemoveScheduledCancellationBuilder contractTermBillingCycleOnRenewal(
+        Integer value) {
+      this.contractTermBillingCycleOnRenewal = value;
+      return this;
+    }
+
+    public SubscriptionRemoveScheduledCancellationBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public SubscriptionRemoveScheduledCancellationParams build() {
+      return new SubscriptionRemoveScheduledCancellationParams(this);
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveScheduledChangesParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveScheduledChangesParams.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveScheduledChangesParams.java
rename to src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveScheduledChangesParams.java
index 504eee42..e84c0441 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveScheduledChangesParams.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveScheduledChangesParams.java
@@ -4,25 +4,22 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.subscription.params;
+package com.chargebee.v4.models.subscription.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class SubscriptionRemoveScheduledChangesParams {
 
-  private final Map<String, Object> formData;
-
   private SubscriptionRemoveScheduledChangesParams(
-      SubscriptionRemoveScheduledChangesBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+      SubscriptionRemoveScheduledChangesBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -33,7 +30,6 @@ public static SubscriptionRemoveScheduledChangesBuilder builder() {
   }
 
   public static final class SubscriptionRemoveScheduledChangesBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private SubscriptionRemoveScheduledChangesBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveScheduledPauseParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveScheduledPauseParams.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveScheduledPauseParams.java
rename to src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveScheduledPauseParams.java
index c424cb8f..32335017 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveScheduledPauseParams.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveScheduledPauseParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.subscription.params;
+package com.chargebee.v4.models.subscription.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class SubscriptionRemoveScheduledPauseParams {
 
-  private final Map<String, Object> formData;
-
-  private SubscriptionRemoveScheduledPauseParams(SubscriptionRemoveScheduledPauseBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private SubscriptionRemoveScheduledPauseParams(SubscriptionRemoveScheduledPauseBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static SubscriptionRemoveScheduledPauseBuilder builder() {
   }
 
   public static final class SubscriptionRemoveScheduledPauseBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private SubscriptionRemoveScheduledPauseBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveScheduledResumptionParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveScheduledResumptionParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveScheduledResumptionParams.java
rename to src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveScheduledResumptionParams.java
index 77e4ba51..730b3022 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRemoveScheduledResumptionParams.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRemoveScheduledResumptionParams.java
@@ -4,25 +4,22 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.subscription.params;
+package com.chargebee.v4.models.subscription.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class SubscriptionRemoveScheduledResumptionParams {
 
-  private final Map<String, Object> formData;
-
   private SubscriptionRemoveScheduledResumptionParams(
-      SubscriptionRemoveScheduledResumptionBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+      SubscriptionRemoveScheduledResumptionBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -33,7 +30,6 @@ public static SubscriptionRemoveScheduledResumptionBuilder builder() {
   }
 
   public static final class SubscriptionRemoveScheduledResumptionBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private SubscriptionRemoveScheduledResumptionBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionResumeParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionResumeParams.java
new file mode 100644
index 00000000..9a62b3af
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionResumeParams.java
@@ -0,0 +1,528 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class SubscriptionResumeParams {
+
+  private final ResumeOption resumeOption;
+
+  private final Timestamp resumeDate;
+
+  private final ChargesHandling chargesHandling;
+
+  private final UnpaidInvoicesHandling unpaidInvoicesHandling;
+
+  private final PaymentInitiator paymentInitiator;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private SubscriptionResumeParams(SubscriptionResumeBuilder builder) {
+
+    this.resumeOption = builder.resumeOption;
+
+    this.resumeDate = builder.resumeDate;
+
+    this.chargesHandling = builder.chargesHandling;
+
+    this.unpaidInvoicesHandling = builder.unpaidInvoicesHandling;
+
+    this.paymentInitiator = builder.paymentInitiator;
+
+    this.paymentIntent = builder.paymentIntent;
+  }
+
+  public ResumeOption getResumeOption() {
+    return resumeOption;
+  }
+
+  public Timestamp getResumeDate() {
+    return resumeDate;
+  }
+
+  public ChargesHandling getChargesHandling() {
+    return chargesHandling;
+  }
+
+  public UnpaidInvoicesHandling getUnpaidInvoicesHandling() {
+    return unpaidInvoicesHandling;
+  }
+
+  public PaymentInitiator getPaymentInitiator() {
+    return paymentInitiator;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.resumeOption != null) {
+
+      formData.put("resume_option", this.resumeOption);
+    }
+
+    if (this.resumeDate != null) {
+
+      formData.put("resume_date", this.resumeDate);
+    }
+
+    if (this.chargesHandling != null) {
+
+      formData.put("charges_handling", this.chargesHandling);
+    }
+
+    if (this.unpaidInvoicesHandling != null) {
+
+      formData.put("unpaid_invoices_handling", this.unpaidInvoicesHandling);
+    }
+
+    if (this.paymentInitiator != null) {
+
+      formData.put("payment_initiator", this.paymentInitiator);
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionResumeParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionResumeBuilder builder() {
+    return new SubscriptionResumeBuilder();
+  }
+
+  public static final class SubscriptionResumeBuilder {
+
+    private ResumeOption resumeOption;
+
+    private Timestamp resumeDate;
+
+    private ChargesHandling chargesHandling;
+
+    private UnpaidInvoicesHandling unpaidInvoicesHandling;
+
+    private PaymentInitiator paymentInitiator;
+
+    private PaymentIntentParams paymentIntent;
+
+    private SubscriptionResumeBuilder() {}
+
+    public SubscriptionResumeBuilder resumeOption(ResumeOption value) {
+      this.resumeOption = value;
+      return this;
+    }
+
+    public SubscriptionResumeBuilder resumeDate(Timestamp value) {
+      this.resumeDate = value;
+      return this;
+    }
+
+    public SubscriptionResumeBuilder chargesHandling(ChargesHandling value) {
+      this.chargesHandling = value;
+      return this;
+    }
+
+    public SubscriptionResumeBuilder unpaidInvoicesHandling(UnpaidInvoicesHandling value) {
+      this.unpaidInvoicesHandling = value;
+      return this;
+    }
+
+    public SubscriptionResumeBuilder paymentInitiator(PaymentInitiator value) {
+      this.paymentInitiator = value;
+      return this;
+    }
+
+    public SubscriptionResumeBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public SubscriptionResumeParams build() {
+      return new SubscriptionResumeParams(this);
+    }
+  }
+
+  public enum ResumeOption {
+    IMMEDIATELY("immediately"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    /** An enum member indicating that ResumeOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ResumeOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ResumeOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ResumeOption enumValue : ResumeOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChargesHandling {
+    INVOICE_IMMEDIATELY("invoice_immediately"),
+
+    ADD_TO_UNBILLED_CHARGES("add_to_unbilled_charges"),
+
+    /** An enum member indicating that ChargesHandling was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChargesHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChargesHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChargesHandling enumValue : ChargesHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum UnpaidInvoicesHandling {
+    NO_ACTION("no_action"),
+
+    SCHEDULE_PAYMENT_COLLECTION("schedule_payment_collection"),
+
+    /**
+     * An enum member indicating that UnpaidInvoicesHandling was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    UnpaidInvoicesHandling(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static UnpaidInvoicesHandling fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (UnpaidInvoicesHandling enumValue : UnpaidInvoicesHandling.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PaymentInitiator {
+    CUSTOMER("customer"),
+
+    MERCHANT("merchant"),
+
+    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentInitiator(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentInitiator fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRetrieveAdvanceInvoiceScheduleParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRetrieveAdvanceInvoiceScheduleParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRetrieveAdvanceInvoiceScheduleParams.java
rename to src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRetrieveAdvanceInvoiceScheduleParams.java
index 4a882d96..2a01a9b9 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRetrieveAdvanceInvoiceScheduleParams.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRetrieveAdvanceInvoiceScheduleParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscription.params;
+package com.chargebee.v4.models.subscription.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRetrieveParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRetrieveParams.java
index 1843bf12..f10728f7 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscription.params;
+package com.chargebee.v4.models.subscription.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRetrieveWithScheduledChangesParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRetrieveWithScheduledChangesParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRetrieveWithScheduledChangesParams.java
rename to src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRetrieveWithScheduledChangesParams.java
index 5fe83ffd..b1cf0c8d 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscription/params/SubscriptionRetrieveWithScheduledChangesParams.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionRetrieveWithScheduledChangesParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscription.params;
+package com.chargebee.v4.models.subscription.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionUpdateForItemsParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionUpdateForItemsParams.java
new file mode 100644
index 00000000..b8d4f5b5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionUpdateForItemsParams.java
@@ -0,0 +1,4875 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class SubscriptionUpdateForItemsParams {
+
+  private final List<String> mandatoryItemsToRemove;
+
+  private final Boolean replaceItemsList;
+
+  private final Long setupFee;
+
+  private final Integer netTermDays;
+
+  private final Timestamp invoiceDate;
+
+  private final Timestamp startDate;
+
+  private final Timestamp trialEnd;
+
+  private final Integer billingCycles;
+
+  private final String coupon;
+
+  private final Integer termsToCharge;
+
+  private final Timestamp reactivateFrom;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final AutoCollection autoCollection;
+
+  private final OfflinePaymentMethod offlinePaymentMethod;
+
+  private final String poNumber;
+
+  private final List<String> couponIds;
+
+  private final Boolean replaceCouponList;
+
+  private final Boolean prorate;
+
+  private final Boolean endOfTerm;
+
+  private final Boolean forceTermReset;
+
+  private final Boolean reactivate;
+
+  private final String tokenId;
+
+  private final String invoiceNotes;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final Boolean invoiceImmediately;
+
+  private final Boolean overrideRelationship;
+
+  private final Timestamp changesScheduledAt;
+
+  private final ChangeOption changeOption;
+
+  private final Integer contractTermBillingCycleOnRenewal;
+
+  private final Integer freePeriod;
+
+  private final FreePeriodUnit freePeriodUnit;
+
+  private final Boolean createPendingInvoices;
+
+  private final Boolean autoCloseInvoices;
+
+  private final TrialEndAction trialEndAction;
+
+  private final PaymentInitiator paymentInitiator;
+
+  private final Boolean invoiceUsages;
+
+  private final CardParams card;
+
+  private final PaymentMethodParams paymentMethod;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final StatementDescriptorParams statementDescriptor;
+
+  private final CustomerParams customer;
+
+  private final ContractTermParams contractTerm;
+
+  private final BillingOverrideParams billingOverride;
+
+  private final List<SubscriptionItemsParams> subscriptionItems;
+
+  private final List<DiscountsParams> discounts;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<CouponsParams> coupons;
+
+  private final Map<String, String> customFields;
+
+  private SubscriptionUpdateForItemsParams(SubscriptionUpdateForItemsBuilder builder) {
+
+    this.mandatoryItemsToRemove = builder.mandatoryItemsToRemove;
+
+    this.replaceItemsList = builder.replaceItemsList;
+
+    this.setupFee = builder.setupFee;
+
+    this.netTermDays = builder.netTermDays;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.startDate = builder.startDate;
+
+    this.trialEnd = builder.trialEnd;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.coupon = builder.coupon;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.reactivateFrom = builder.reactivateFrom;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+    this.poNumber = builder.poNumber;
+
+    this.couponIds = builder.couponIds;
+
+    this.replaceCouponList = builder.replaceCouponList;
+
+    this.prorate = builder.prorate;
+
+    this.endOfTerm = builder.endOfTerm;
+
+    this.forceTermReset = builder.forceTermReset;
+
+    this.reactivate = builder.reactivate;
+
+    this.tokenId = builder.tokenId;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.metaData = builder.metaData;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.overrideRelationship = builder.overrideRelationship;
+
+    this.changesScheduledAt = builder.changesScheduledAt;
+
+    this.changeOption = builder.changeOption;
+
+    this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+    this.freePeriod = builder.freePeriod;
+
+    this.freePeriodUnit = builder.freePeriodUnit;
+
+    this.createPendingInvoices = builder.createPendingInvoices;
+
+    this.autoCloseInvoices = builder.autoCloseInvoices;
+
+    this.trialEndAction = builder.trialEndAction;
+
+    this.paymentInitiator = builder.paymentInitiator;
+
+    this.invoiceUsages = builder.invoiceUsages;
+
+    this.card = builder.card;
+
+    this.paymentMethod = builder.paymentMethod;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.statementDescriptor = builder.statementDescriptor;
+
+    this.customer = builder.customer;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.billingOverride = builder.billingOverride;
+
+    this.subscriptionItems = builder.subscriptionItems;
+
+    this.discounts = builder.discounts;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.coupons = builder.coupons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public List<String> getMandatoryItemsToRemove() {
+    return mandatoryItemsToRemove;
+  }
+
+  public Boolean getReplaceItemsList() {
+    return replaceItemsList;
+  }
+
+  public Long getSetupFee() {
+    return setupFee;
+  }
+
+  public Integer getNetTermDays() {
+    return netTermDays;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public Timestamp getStartDate() {
+    return startDate;
+  }
+
+  public Timestamp getTrialEnd() {
+    return trialEnd;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public Timestamp getReactivateFrom() {
+    return reactivateFrom;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public OfflinePaymentMethod getOfflinePaymentMethod() {
+    return offlinePaymentMethod;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public Boolean getReplaceCouponList() {
+    return replaceCouponList;
+  }
+
+  public Boolean getProrate() {
+    return prorate;
+  }
+
+  public Boolean getEndOfTerm() {
+    return endOfTerm;
+  }
+
+  public Boolean getForceTermReset() {
+    return forceTermReset;
+  }
+
+  public Boolean getReactivate() {
+    return reactivate;
+  }
+
+  public String getTokenId() {
+    return tokenId;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public Boolean getOverrideRelationship() {
+    return overrideRelationship;
+  }
+
+  public Timestamp getChangesScheduledAt() {
+    return changesScheduledAt;
+  }
+
+  public ChangeOption getChangeOption() {
+    return changeOption;
+  }
+
+  public Integer getContractTermBillingCycleOnRenewal() {
+    return contractTermBillingCycleOnRenewal;
+  }
+
+  public Integer getFreePeriod() {
+    return freePeriod;
+  }
+
+  public FreePeriodUnit getFreePeriodUnit() {
+    return freePeriodUnit;
+  }
+
+  public Boolean getCreatePendingInvoices() {
+    return createPendingInvoices;
+  }
+
+  public Boolean getAutoCloseInvoices() {
+    return autoCloseInvoices;
+  }
+
+  public TrialEndAction getTrialEndAction() {
+    return trialEndAction;
+  }
+
+  public PaymentInitiator getPaymentInitiator() {
+    return paymentInitiator;
+  }
+
+  public Boolean getInvoiceUsages() {
+    return invoiceUsages;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public PaymentMethodParams getPaymentMethod() {
+    return paymentMethod;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public StatementDescriptorParams getStatementDescriptor() {
+    return statementDescriptor;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public BillingOverrideParams getBillingOverride() {
+    return billingOverride;
+  }
+
+  public List<SubscriptionItemsParams> getSubscriptionItems() {
+    return subscriptionItems;
+  }
+
+  public List<DiscountsParams> getDiscounts() {
+    return discounts;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<CouponsParams> getCoupons() {
+    return coupons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.mandatoryItemsToRemove != null) {
+
+      formData.put("mandatory_items_to_remove", this.mandatoryItemsToRemove);
+    }
+
+    if (this.replaceItemsList != null) {
+
+      formData.put("replace_items_list", this.replaceItemsList);
+    }
+
+    if (this.setupFee != null) {
+
+      formData.put("setup_fee", this.setupFee);
+    }
+
+    if (this.netTermDays != null) {
+
+      formData.put("net_term_days", this.netTermDays);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.startDate != null) {
+
+      formData.put("start_date", this.startDate);
+    }
+
+    if (this.trialEnd != null) {
+
+      formData.put("trial_end", this.trialEnd);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.reactivateFrom != null) {
+
+      formData.put("reactivate_from", this.reactivateFrom);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.offlinePaymentMethod != null) {
+
+      formData.put("offline_payment_method", this.offlinePaymentMethod);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.replaceCouponList != null) {
+
+      formData.put("replace_coupon_list", this.replaceCouponList);
+    }
+
+    if (this.prorate != null) {
+
+      formData.put("prorate", this.prorate);
+    }
+
+    if (this.endOfTerm != null) {
+
+      formData.put("end_of_term", this.endOfTerm);
+    }
+
+    if (this.forceTermReset != null) {
+
+      formData.put("force_term_reset", this.forceTermReset);
+    }
+
+    if (this.reactivate != null) {
+
+      formData.put("reactivate", this.reactivate);
+    }
+
+    if (this.tokenId != null) {
+
+      formData.put("token_id", this.tokenId);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.overrideRelationship != null) {
+
+      formData.put("override_relationship", this.overrideRelationship);
+    }
+
+    if (this.changesScheduledAt != null) {
+
+      formData.put("changes_scheduled_at", this.changesScheduledAt);
+    }
+
+    if (this.changeOption != null) {
+
+      formData.put("change_option", this.changeOption);
+    }
+
+    if (this.contractTermBillingCycleOnRenewal != null) {
+
+      formData.put(
+          "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+    }
+
+    if (this.freePeriod != null) {
+
+      formData.put("free_period", this.freePeriod);
+    }
+
+    if (this.freePeriodUnit != null) {
+
+      formData.put("free_period_unit", this.freePeriodUnit);
+    }
+
+    if (this.createPendingInvoices != null) {
+
+      formData.put("create_pending_invoices", this.createPendingInvoices);
+    }
+
+    if (this.autoCloseInvoices != null) {
+
+      formData.put("auto_close_invoices", this.autoCloseInvoices);
+    }
+
+    if (this.trialEndAction != null) {
+
+      formData.put("trial_end_action", this.trialEndAction);
+    }
+
+    if (this.paymentInitiator != null) {
+
+      formData.put("payment_initiator", this.paymentInitiator);
+    }
+
+    if (this.invoiceUsages != null) {
+
+      formData.put("invoice_usages", this.invoiceUsages);
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentMethod != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentMethod.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_method[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.statementDescriptor != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.statementDescriptor.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingOverride != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingOverride.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_override[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.subscriptionItems != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionItems.size(); i++) {
+        SubscriptionItemsParams item = this.subscriptionItems.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_items[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.discounts != null) {
+
+      // List of objects
+      for (int i = 0; i < this.discounts.size(); i++) {
+        DiscountsParams item = this.discounts.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "discounts[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.coupons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.coupons.size(); i++) {
+        CouponsParams item = this.coupons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionUpdateForItemsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionUpdateForItemsBuilder builder() {
+    return new SubscriptionUpdateForItemsBuilder();
+  }
+
+  public static final class SubscriptionUpdateForItemsBuilder {
+
+    private List<String> mandatoryItemsToRemove;
+
+    private Boolean replaceItemsList;
+
+    private Long setupFee;
+
+    private Integer netTermDays;
+
+    private Timestamp invoiceDate;
+
+    private Timestamp startDate;
+
+    private Timestamp trialEnd;
+
+    private Integer billingCycles;
+
+    private String coupon;
+
+    private Integer termsToCharge;
+
+    private Timestamp reactivateFrom;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private AutoCollection autoCollection;
+
+    private OfflinePaymentMethod offlinePaymentMethod;
+
+    private String poNumber;
+
+    private List<String> couponIds;
+
+    private Boolean replaceCouponList;
+
+    private Boolean prorate;
+
+    private Boolean endOfTerm;
+
+    private Boolean forceTermReset;
+
+    private Boolean reactivate;
+
+    private String tokenId;
+
+    private String invoiceNotes;
+
+    private java.util.Map<String, Object> metaData;
+
+    private Boolean invoiceImmediately;
+
+    private Boolean overrideRelationship;
+
+    private Timestamp changesScheduledAt;
+
+    private ChangeOption changeOption;
+
+    private Integer contractTermBillingCycleOnRenewal;
+
+    private Integer freePeriod;
+
+    private FreePeriodUnit freePeriodUnit;
+
+    private Boolean createPendingInvoices;
+
+    private Boolean autoCloseInvoices;
+
+    private TrialEndAction trialEndAction;
+
+    private PaymentInitiator paymentInitiator;
+
+    private Boolean invoiceUsages;
+
+    private CardParams card;
+
+    private PaymentMethodParams paymentMethod;
+
+    private PaymentIntentParams paymentIntent;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private StatementDescriptorParams statementDescriptor;
+
+    private CustomerParams customer;
+
+    private ContractTermParams contractTerm;
+
+    private BillingOverrideParams billingOverride;
+
+    private List<SubscriptionItemsParams> subscriptionItems;
+
+    private List<DiscountsParams> discounts;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<CouponsParams> coupons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private SubscriptionUpdateForItemsBuilder() {}
+
+    public SubscriptionUpdateForItemsBuilder mandatoryItemsToRemove(List<String> value) {
+      this.mandatoryItemsToRemove = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder replaceItemsList(Boolean value) {
+      this.replaceItemsList = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionUpdateForItemsBuilder setupFee(Long value) {
+      this.setupFee = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder netTermDays(Integer value) {
+      this.netTermDays = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder startDate(Timestamp value) {
+      this.startDate = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder trialEnd(Timestamp value) {
+      this.trialEnd = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionUpdateForItemsBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder reactivateFrom(Timestamp value) {
+      this.reactivateFrom = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+      this.offlinePaymentMethod = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder replaceCouponList(Boolean value) {
+      this.replaceCouponList = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder prorate(Boolean value) {
+      this.prorate = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder endOfTerm(Boolean value) {
+      this.endOfTerm = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder forceTermReset(Boolean value) {
+      this.forceTermReset = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder reactivate(Boolean value) {
+      this.reactivate = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder tokenId(String value) {
+      this.tokenId = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder overrideRelationship(Boolean value) {
+      this.overrideRelationship = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder changesScheduledAt(Timestamp value) {
+      this.changesScheduledAt = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder changeOption(ChangeOption value) {
+      this.changeOption = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder contractTermBillingCycleOnRenewal(Integer value) {
+      this.contractTermBillingCycleOnRenewal = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder freePeriod(Integer value) {
+      this.freePeriod = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder freePeriodUnit(FreePeriodUnit value) {
+      this.freePeriodUnit = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder createPendingInvoices(Boolean value) {
+      this.createPendingInvoices = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder autoCloseInvoices(Boolean value) {
+      this.autoCloseInvoices = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder trialEndAction(TrialEndAction value) {
+      this.trialEndAction = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder paymentInitiator(PaymentInitiator value) {
+      this.paymentInitiator = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder invoiceUsages(Boolean value) {
+      this.invoiceUsages = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder paymentMethod(PaymentMethodParams value) {
+      this.paymentMethod = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder statementDescriptor(StatementDescriptorParams value) {
+      this.statementDescriptor = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder billingOverride(BillingOverrideParams value) {
+      this.billingOverride = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder subscriptionItems(
+        List<SubscriptionItemsParams> value) {
+      this.subscriptionItems = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder discounts(List<DiscountsParams> value) {
+      this.discounts = value;
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionUpdateForItemsBuilder coupons(List<CouponsParams> value) {
+      this.coupons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public SubscriptionUpdateForItemsBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public SubscriptionUpdateForItemsBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public SubscriptionUpdateForItemsParams build() {
+      return new SubscriptionUpdateForItemsParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum OfflinePaymentMethod {
+    NO_PREFERENCE("no_preference"),
+
+    CASH("cash"),
+
+    CHECK("check"),
+
+    BANK_TRANSFER("bank_transfer"),
+
+    ACH_CREDIT("ach_credit"),
+
+    SEPA_CREDIT("sepa_credit"),
+
+    BOLETO("boleto"),
+
+    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+    CUSTOM("custom"),
+
+    /**
+     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    OfflinePaymentMethod(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static OfflinePaymentMethod fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChangeOption {
+    IMMEDIATELY("immediately"),
+
+    END_OF_TERM("end_of_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChangeOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChangeOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChangeOption enumValue : ChangeOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum FreePeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    FreePeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static FreePeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TrialEndAction {
+    SITE_DEFAULT("site_default"),
+
+    PLAN_DEFAULT("plan_default"),
+
+    ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+    CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TrialEndAction(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TrialEndAction fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TrialEndAction enumValue : TrialEndAction.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum PaymentInitiator {
+    CUSTOMER("customer"),
+
+    MERCHANT("merchant"),
+
+    /** An enum member indicating that PaymentInitiator was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentInitiator(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentInitiator fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentInitiator enumValue : PaymentInitiator.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String tmpToken;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String number;
+
+    private final Integer expiryMonth;
+
+    private final Integer expiryYear;
+
+    private final String cvv;
+
+    private final PreferredScheme preferredScheme;
+
+    private final String billingAddr1;
+
+    private final String billingAddr2;
+
+    private final String billingCity;
+
+    private final String billingStateCode;
+
+    private final String billingState;
+
+    private final String billingZip;
+
+    private final String billingCountry;
+
+    private final String ipAddress;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.number = builder.number;
+
+      this.expiryMonth = builder.expiryMonth;
+
+      this.expiryYear = builder.expiryYear;
+
+      this.cvv = builder.cvv;
+
+      this.preferredScheme = builder.preferredScheme;
+
+      this.billingAddr1 = builder.billingAddr1;
+
+      this.billingAddr2 = builder.billingAddr2;
+
+      this.billingCity = builder.billingCity;
+
+      this.billingStateCode = builder.billingStateCode;
+
+      this.billingState = builder.billingState;
+
+      this.billingZip = builder.billingZip;
+
+      this.billingCountry = builder.billingCountry;
+
+      this.ipAddress = builder.ipAddress;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getNumber() {
+      return number;
+    }
+
+    public Integer getExpiryMonth() {
+      return expiryMonth;
+    }
+
+    public Integer getExpiryYear() {
+      return expiryYear;
+    }
+
+    public String getCvv() {
+      return cvv;
+    }
+
+    public PreferredScheme getPreferredScheme() {
+      return preferredScheme;
+    }
+
+    public String getBillingAddr1() {
+      return billingAddr1;
+    }
+
+    public String getBillingAddr2() {
+      return billingAddr2;
+    }
+
+    public String getBillingCity() {
+      return billingCity;
+    }
+
+    public String getBillingStateCode() {
+      return billingStateCode;
+    }
+
+    public String getBillingState() {
+      return billingState;
+    }
+
+    public String getBillingZip() {
+      return billingZip;
+    }
+
+    public String getBillingCountry() {
+      return billingCountry;
+    }
+
+    public String getIpAddress() {
+      return ipAddress;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.number != null) {
+
+        formData.put("number", this.number);
+      }
+
+      if (this.expiryMonth != null) {
+
+        formData.put("expiry_month", this.expiryMonth);
+      }
+
+      if (this.expiryYear != null) {
+
+        formData.put("expiry_year", this.expiryYear);
+      }
+
+      if (this.cvv != null) {
+
+        formData.put("cvv", this.cvv);
+      }
+
+      if (this.preferredScheme != null) {
+
+        formData.put("preferred_scheme", this.preferredScheme);
+      }
+
+      if (this.billingAddr1 != null) {
+
+        formData.put("billing_addr1", this.billingAddr1);
+      }
+
+      if (this.billingAddr2 != null) {
+
+        formData.put("billing_addr2", this.billingAddr2);
+      }
+
+      if (this.billingCity != null) {
+
+        formData.put("billing_city", this.billingCity);
+      }
+
+      if (this.billingStateCode != null) {
+
+        formData.put("billing_state_code", this.billingStateCode);
+      }
+
+      if (this.billingState != null) {
+
+        formData.put("billing_state", this.billingState);
+      }
+
+      if (this.billingZip != null) {
+
+        formData.put("billing_zip", this.billingZip);
+      }
+
+      if (this.billingCountry != null) {
+
+        formData.put("billing_country", this.billingCountry);
+      }
+
+      if (this.ipAddress != null) {
+
+        formData.put("ip_address", this.ipAddress);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String tmpToken;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String number;
+
+      private Integer expiryMonth;
+
+      private Integer expiryYear;
+
+      private String cvv;
+
+      private PreferredScheme preferredScheme;
+
+      private String billingAddr1;
+
+      private String billingAddr2;
+
+      private String billingCity;
+
+      private String billingStateCode;
+
+      private String billingState;
+
+      private String billingZip;
+
+      private String billingCountry;
+
+      private String ipAddress;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      @Deprecated
+      public CardBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public CardBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CardBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CardBuilder number(String value) {
+        this.number = value;
+        return this;
+      }
+
+      public CardBuilder expiryMonth(Integer value) {
+        this.expiryMonth = value;
+        return this;
+      }
+
+      public CardBuilder expiryYear(Integer value) {
+        this.expiryYear = value;
+        return this;
+      }
+
+      public CardBuilder cvv(String value) {
+        this.cvv = value;
+        return this;
+      }
+
+      public CardBuilder preferredScheme(PreferredScheme value) {
+        this.preferredScheme = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr1(String value) {
+        this.billingAddr1 = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr2(String value) {
+        this.billingAddr2 = value;
+        return this;
+      }
+
+      public CardBuilder billingCity(String value) {
+        this.billingCity = value;
+        return this;
+      }
+
+      public CardBuilder billingStateCode(String value) {
+        this.billingStateCode = value;
+        return this;
+      }
+
+      public CardBuilder billingState(String value) {
+        this.billingState = value;
+        return this;
+      }
+
+      public CardBuilder billingZip(String value) {
+        this.billingZip = value;
+        return this;
+      }
+
+      public CardBuilder billingCountry(String value) {
+        this.billingCountry = value;
+        return this;
+      }
+
+      @Deprecated
+      public CardBuilder ipAddress(String value) {
+        this.ipAddress = value;
+        return this;
+      }
+
+      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PreferredScheme {
+      CARTES_BANCAIRES("cartes_bancaires"),
+
+      MASTERCARD("mastercard"),
+
+      VISA("visa"),
+
+      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PreferredScheme(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PreferredScheme fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PreferredScheme enumValue : PreferredScheme.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentMethodParams {
+
+    private final Type type;
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String referenceId;
+
+    private final String tmpToken;
+
+    private final String issuingCountry;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentMethodParams(PaymentMethodBuilder builder) {
+
+      this.type = builder.type;
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.referenceId = builder.referenceId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.issuingCountry = builder.issuingCountry;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getIssuingCountry() {
+      return issuingCountry;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.issuingCountry != null) {
+
+        formData.put("issuing_country", this.issuingCountry);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentMethodBuilder builder() {
+      return new PaymentMethodBuilder();
+    }
+
+    public static final class PaymentMethodBuilder {
+
+      private Type type;
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String referenceId;
+
+      private String tmpToken;
+
+      private String issuingCountry;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentMethodBuilder() {}
+
+      public PaymentMethodBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentMethodBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder issuingCountry(String value) {
+        this.issuingCountry = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentMethodParams build() {
+        return new PaymentMethodParams(this);
+      }
+    }
+
+    public enum Type {
+      CARD("card"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      GENERIC("generic"),
+
+      ALIPAY("alipay"),
+
+      UNIONPAY("unionpay"),
+
+      APPLE_PAY("apple_pay"),
+
+      WECHAT_PAY("wechat_pay"),
+
+      IDEAL("ideal"),
+
+      GOOGLE_PAY("google_pay"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GIROPAY("giropay"),
+
+      DOTPAY("dotpay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      VENMO("venmo"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      GOCARDLESS("gocardless"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatementDescriptorParams {
+
+    private final String descriptor;
+
+    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
+
+      this.descriptor = builder.descriptor;
+    }
+
+    public String getDescriptor() {
+      return descriptor;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.descriptor != null) {
+
+        formData.put("descriptor", this.descriptor);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatementDescriptorParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatementDescriptorBuilder builder() {
+      return new StatementDescriptorBuilder();
+    }
+
+    public static final class StatementDescriptorBuilder {
+
+      private String descriptor;
+
+      private StatementDescriptorBuilder() {}
+
+      public StatementDescriptorBuilder descriptor(String value) {
+        this.descriptor = value;
+        return this;
+      }
+
+      public StatementDescriptorParams build() {
+        return new StatementDescriptorParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final String entityIdentifierScheme;
+
+    private final Boolean isEinvoiceEnabled;
+
+    private final EinvoicingMethod einvoicingMethod;
+
+    private final String entityIdentifierStandard;
+
+    private final Boolean businessCustomerWithoutVatNumber;
+
+    private final Boolean registeredForGst;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.entityIdentifierScheme = builder.entityIdentifierScheme;
+
+      this.isEinvoiceEnabled = builder.isEinvoiceEnabled;
+
+      this.einvoicingMethod = builder.einvoicingMethod;
+
+      this.entityIdentifierStandard = builder.entityIdentifierStandard;
+
+      this.businessCustomerWithoutVatNumber = builder.businessCustomerWithoutVatNumber;
+
+      this.registeredForGst = builder.registeredForGst;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public String getEntityIdentifierScheme() {
+      return entityIdentifierScheme;
+    }
+
+    public Boolean getIsEinvoiceEnabled() {
+      return isEinvoiceEnabled;
+    }
+
+    public EinvoicingMethod getEinvoicingMethod() {
+      return einvoicingMethod;
+    }
+
+    public String getEntityIdentifierStandard() {
+      return entityIdentifierStandard;
+    }
+
+    public Boolean getBusinessCustomerWithoutVatNumber() {
+      return businessCustomerWithoutVatNumber;
+    }
+
+    public Boolean getRegisteredForGst() {
+      return registeredForGst;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.entityIdentifierScheme != null) {
+
+        formData.put("entity_identifier_scheme", this.entityIdentifierScheme);
+      }
+
+      if (this.isEinvoiceEnabled != null) {
+
+        formData.put("is_einvoice_enabled", this.isEinvoiceEnabled);
+      }
+
+      if (this.einvoicingMethod != null) {
+
+        formData.put("einvoicing_method", this.einvoicingMethod);
+      }
+
+      if (this.entityIdentifierStandard != null) {
+
+        formData.put("entity_identifier_standard", this.entityIdentifierStandard);
+      }
+
+      if (this.businessCustomerWithoutVatNumber != null) {
+
+        formData.put("business_customer_without_vat_number", this.businessCustomerWithoutVatNumber);
+      }
+
+      if (this.registeredForGst != null) {
+
+        formData.put("registered_for_gst", this.registeredForGst);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private String entityIdentifierScheme;
+
+      private Boolean isEinvoiceEnabled;
+
+      private EinvoicingMethod einvoicingMethod;
+
+      private String entityIdentifierStandard;
+
+      private Boolean businessCustomerWithoutVatNumber;
+
+      private Boolean registeredForGst;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder entityIdentifierScheme(String value) {
+        this.entityIdentifierScheme = value;
+        return this;
+      }
+
+      public CustomerBuilder isEinvoiceEnabled(Boolean value) {
+        this.isEinvoiceEnabled = value;
+        return this;
+      }
+
+      public CustomerBuilder einvoicingMethod(EinvoicingMethod value) {
+        this.einvoicingMethod = value;
+        return this;
+      }
+
+      public CustomerBuilder entityIdentifierStandard(String value) {
+        this.entityIdentifierStandard = value;
+        return this;
+      }
+
+      public CustomerBuilder businessCustomerWithoutVatNumber(Boolean value) {
+        this.businessCustomerWithoutVatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder registeredForGst(Boolean value) {
+        this.registeredForGst = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+
+    public enum EinvoicingMethod {
+      AUTOMATIC("automatic"),
+
+      MANUAL("manual"),
+
+      SITE_DEFAULT("site_default"),
+
+      /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EinvoicingMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EinvoicingMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private final Timestamp contractStart;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+
+      this.contractStart = builder.contractStart;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    public Timestamp getContractStart() {
+      return contractStart;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      if (this.contractStart != null) {
+
+        formData.put("contract_start", this.contractStart);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private Timestamp contractStart;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      @Deprecated
+      public ContractTermBuilder contractStart(Timestamp value) {
+        this.contractStart = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingOverrideParams {
+
+    private final Long maxExcessPaymentUsage;
+
+    private final Long maxRefundableCreditsUsage;
+
+    private BillingOverrideParams(BillingOverrideBuilder builder) {
+
+      this.maxExcessPaymentUsage = builder.maxExcessPaymentUsage;
+
+      this.maxRefundableCreditsUsage = builder.maxRefundableCreditsUsage;
+    }
+
+    public Long getMaxExcessPaymentUsage() {
+      return maxExcessPaymentUsage;
+    }
+
+    public Long getMaxRefundableCreditsUsage() {
+      return maxRefundableCreditsUsage;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.maxExcessPaymentUsage != null) {
+
+        formData.put("max_excess_payment_usage", this.maxExcessPaymentUsage);
+      }
+
+      if (this.maxRefundableCreditsUsage != null) {
+
+        formData.put("max_refundable_credits_usage", this.maxRefundableCreditsUsage);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingOverrideParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingOverrideBuilder builder() {
+      return new BillingOverrideBuilder();
+    }
+
+    public static final class BillingOverrideBuilder {
+
+      private Long maxExcessPaymentUsage;
+
+      private Long maxRefundableCreditsUsage;
+
+      private BillingOverrideBuilder() {}
+
+      public BillingOverrideBuilder maxExcessPaymentUsage(Long value) {
+        this.maxExcessPaymentUsage = value;
+        return this;
+      }
+
+      public BillingOverrideBuilder maxRefundableCreditsUsage(Long value) {
+        this.maxRefundableCreditsUsage = value;
+        return this;
+      }
+
+      public BillingOverrideParams build() {
+        return new BillingOverrideParams(this);
+      }
+    }
+  }
+
+  public static final class SubscriptionItemsParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Integer billingCycles;
+
+    private final Timestamp trialEnd;
+
+    private final Integer servicePeriodDays;
+
+    private final ChargeOnEvent chargeOnEvent;
+
+    private final Boolean chargeOnce;
+
+    private final ChargeOnOption chargeOnOption;
+
+    private final ItemType itemType;
+
+    private final ProrationType prorationType;
+
+    private final UsageAccumulationResetFrequency usageAccumulationResetFrequency;
+
+    private SubscriptionItemsParams(SubscriptionItemsBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.servicePeriodDays = builder.servicePeriodDays;
+
+      this.chargeOnEvent = builder.chargeOnEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.chargeOnOption = builder.chargeOnOption;
+
+      this.itemType = builder.itemType;
+
+      this.prorationType = builder.prorationType;
+
+      this.usageAccumulationResetFrequency = builder.usageAccumulationResetFrequency;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public Integer getServicePeriodDays() {
+      return servicePeriodDays;
+    }
+
+    public ChargeOnEvent getChargeOnEvent() {
+      return chargeOnEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public ChargeOnOption getChargeOnOption() {
+      return chargeOnOption;
+    }
+
+    public ItemType getItemType() {
+      return itemType;
+    }
+
+    public ProrationType getProrationType() {
+      return prorationType;
+    }
+
+    public UsageAccumulationResetFrequency getUsageAccumulationResetFrequency() {
+      return usageAccumulationResetFrequency;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.servicePeriodDays != null) {
+
+        formData.put("service_period_days", this.servicePeriodDays);
+      }
+
+      if (this.chargeOnEvent != null) {
+
+        formData.put("charge_on_event", this.chargeOnEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.chargeOnOption != null) {
+
+        formData.put("charge_on_option", this.chargeOnOption);
+      }
+
+      if (this.itemType != null) {
+
+        formData.put("item_type", this.itemType);
+      }
+
+      if (this.prorationType != null) {
+
+        formData.put("proration_type", this.prorationType);
+      }
+
+      if (this.usageAccumulationResetFrequency != null) {
+
+        formData.put("usage_accumulation_reset_frequency", this.usageAccumulationResetFrequency);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionItemsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionItemsBuilder builder() {
+      return new SubscriptionItemsBuilder();
+    }
+
+    public static final class SubscriptionItemsBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Integer billingCycles;
+
+      private Timestamp trialEnd;
+
+      private Integer servicePeriodDays;
+
+      private ChargeOnEvent chargeOnEvent;
+
+      private Boolean chargeOnce;
+
+      private ChargeOnOption chargeOnOption;
+
+      private ItemType itemType;
+
+      private ProrationType prorationType;
+
+      private UsageAccumulationResetFrequency usageAccumulationResetFrequency;
+
+      private SubscriptionItemsBuilder() {}
+
+      public SubscriptionItemsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder servicePeriodDays(Integer value) {
+        this.servicePeriodDays = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnEvent(ChargeOnEvent value) {
+        this.chargeOnEvent = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder chargeOnOption(ChargeOnOption value) {
+        this.chargeOnOption = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder itemType(ItemType value) {
+        this.itemType = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder prorationType(ProrationType value) {
+        this.prorationType = value;
+        return this;
+      }
+
+      public SubscriptionItemsBuilder usageAccumulationResetFrequency(
+          UsageAccumulationResetFrequency value) {
+        this.usageAccumulationResetFrequency = value;
+        return this;
+      }
+
+      public SubscriptionItemsParams build() {
+        return new SubscriptionItemsParams(this);
+      }
+    }
+
+    public enum ChargeOnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that ChargeOnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnEvent enumValue : ChargeOnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ChargeOnOption {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOnOption was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOnOption(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOnOption fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOnOption enumValue : ChargeOnOption.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ItemType {
+      PLAN("plan"),
+
+      ADDON("addon"),
+
+      CHARGE("charge"),
+
+      /** An enum member indicating that ItemType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ItemType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ItemType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ItemType enumValue : ItemType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum ProrationType {
+      FULL_TERM("full_term"),
+
+      PARTIAL_TERM("partial_term"),
+
+      NONE("none"),
+
+      /** An enum member indicating that ProrationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ProrationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ProrationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ProrationType enumValue : ProrationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum UsageAccumulationResetFrequency {
+      NEVER("never"),
+
+      SUBSCRIPTION_BILLING_FREQUENCY("subscription_billing_frequency"),
+
+      /**
+       * An enum member indicating that UsageAccumulationResetFrequency was instantiated with an
+       * unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      UsageAccumulationResetFrequency(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static UsageAccumulationResetFrequency fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (UsageAccumulationResetFrequency enumValue : UsageAccumulationResetFrequency.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class DiscountsParams {
+
+    private final ApplyOn applyOn;
+
+    private final DurationType durationType;
+
+    private final Number percentage;
+
+    private final Long amount;
+
+    private final Integer period;
+
+    private final PeriodUnit periodUnit;
+
+    private final Boolean includedInMrr;
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final OperationType operationType;
+
+    private final String id;
+
+    private DiscountsParams(DiscountsBuilder builder) {
+
+      this.applyOn = builder.applyOn;
+
+      this.durationType = builder.durationType;
+
+      this.percentage = builder.percentage;
+
+      this.amount = builder.amount;
+
+      this.period = builder.period;
+
+      this.periodUnit = builder.periodUnit;
+
+      this.includedInMrr = builder.includedInMrr;
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.operationType = builder.operationType;
+
+      this.id = builder.id;
+    }
+
+    public ApplyOn getApplyOn() {
+      return applyOn;
+    }
+
+    public DurationType getDurationType() {
+      return durationType;
+    }
+
+    public Number getPercentage() {
+      return percentage;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public Integer getPeriod() {
+      return period;
+    }
+
+    public PeriodUnit getPeriodUnit() {
+      return periodUnit;
+    }
+
+    public Boolean getIncludedInMrr() {
+      return includedInMrr;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public OperationType getOperationType() {
+      return operationType;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.applyOn != null) {
+
+        formData.put("apply_on", this.applyOn);
+      }
+
+      if (this.durationType != null) {
+
+        formData.put("duration_type", this.durationType);
+      }
+
+      if (this.percentage != null) {
+
+        formData.put("percentage", this.percentage);
+      }
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.period != null) {
+
+        formData.put("period", this.period);
+      }
+
+      if (this.periodUnit != null) {
+
+        formData.put("period_unit", this.periodUnit);
+      }
+
+      if (this.includedInMrr != null) {
+
+        formData.put("included_in_mrr", this.includedInMrr);
+      }
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.operationType != null) {
+
+        formData.put("operation_type", this.operationType);
+      }
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for DiscountsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static DiscountsBuilder builder() {
+      return new DiscountsBuilder();
+    }
+
+    public static final class DiscountsBuilder {
+
+      private ApplyOn applyOn;
+
+      private DurationType durationType;
+
+      private Number percentage;
+
+      private Long amount;
+
+      private Integer period;
+
+      private PeriodUnit periodUnit;
+
+      private Boolean includedInMrr;
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private OperationType operationType;
+
+      private String id;
+
+      private DiscountsBuilder() {}
+
+      public DiscountsBuilder applyOn(ApplyOn value) {
+        this.applyOn = value;
+        return this;
+      }
+
+      public DiscountsBuilder durationType(DurationType value) {
+        this.durationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder percentage(Number value) {
+        this.percentage = value;
+        return this;
+      }
+
+      public DiscountsBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public DiscountsBuilder period(Integer value) {
+        this.period = value;
+        return this;
+      }
+
+      public DiscountsBuilder periodUnit(PeriodUnit value) {
+        this.periodUnit = value;
+        return this;
+      }
+
+      public DiscountsBuilder includedInMrr(Boolean value) {
+        this.includedInMrr = value;
+        return this;
+      }
+
+      public DiscountsBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public DiscountsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public DiscountsBuilder operationType(OperationType value) {
+        this.operationType = value;
+        return this;
+      }
+
+      public DiscountsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public DiscountsParams build() {
+        return new DiscountsParams(this);
+      }
+    }
+
+    public enum ApplyOn {
+      INVOICE_AMOUNT("invoice_amount"),
+
+      SPECIFIC_ITEM_PRICE("specific_item_price"),
+
+      /** An enum member indicating that ApplyOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ApplyOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ApplyOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ApplyOn enumValue : ApplyOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum DurationType {
+      ONE_TIME("one_time"),
+
+      FOREVER("forever"),
+
+      LIMITED_PERIOD("limited_period"),
+
+      /** An enum member indicating that DurationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      DurationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static DurationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (DurationType enumValue : DurationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PeriodUnit {
+      DAY("day"),
+
+      WEEK("week"),
+
+      MONTH("month"),
+
+      YEAR("year"),
+
+      /** An enum member indicating that PeriodUnit was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PeriodUnit(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PeriodUnit fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PeriodUnit enumValue : PeriodUnit.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OperationType {
+      ADD("add"),
+
+      REMOVE("remove"),
+
+      /** An enum member indicating that OperationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OperationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OperationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OperationType enumValue : OperationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponsParams {
+
+    private final String couponId;
+
+    private final Timestamp applyTill;
+
+    private CouponsParams(CouponsBuilder builder) {
+
+      this.couponId = builder.couponId;
+
+      this.applyTill = builder.applyTill;
+    }
+
+    public String getCouponId() {
+      return couponId;
+    }
+
+    public Timestamp getApplyTill() {
+      return applyTill;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.couponId != null) {
+
+        formData.put("coupon_id", this.couponId);
+      }
+
+      if (this.applyTill != null) {
+
+        formData.put("apply_till", this.applyTill);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsBuilder builder() {
+      return new CouponsBuilder();
+    }
+
+    public static final class CouponsBuilder {
+
+      private String couponId;
+
+      private Timestamp applyTill;
+
+      private CouponsBuilder() {}
+
+      public CouponsBuilder couponId(String value) {
+        this.couponId = value;
+        return this;
+      }
+
+      public CouponsBuilder applyTill(Timestamp value) {
+        this.applyTill = value;
+        return this;
+      }
+
+      public CouponsParams build() {
+        return new CouponsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionUpdateParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionUpdateParams.java
new file mode 100644
index 00000000..a90548e4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionUpdateParams.java
@@ -0,0 +1,4123 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class SubscriptionUpdateParams {
+
+  private final String planId;
+
+  private final Integer planQuantity;
+
+  private final Long planUnitPrice;
+
+  private final Long setupFee;
+
+  private final Boolean replaceAddonList;
+
+  private final List<String> mandatoryAddonsToRemove;
+
+  private final String planQuantityInDecimal;
+
+  private final String planUnitPriceInDecimal;
+
+  private final Timestamp invoiceDate;
+
+  private final Timestamp startDate;
+
+  private final Timestamp trialEnd;
+
+  private final Integer billingCycles;
+
+  private final String coupon;
+
+  private final Integer termsToCharge;
+
+  private final Timestamp reactivateFrom;
+
+  private final BillingAlignmentMode billingAlignmentMode;
+
+  private final AutoCollection autoCollection;
+
+  private final OfflinePaymentMethod offlinePaymentMethod;
+
+  private final String poNumber;
+
+  private final List<String> couponIds;
+
+  private final Boolean replaceCouponList;
+
+  private final Boolean prorate;
+
+  private final Boolean endOfTerm;
+
+  private final Boolean forceTermReset;
+
+  private final Boolean reactivate;
+
+  private final String tokenId;
+
+  private final String invoiceNotes;
+
+  private final java.util.Map<String, Object> metaData;
+
+  private final Boolean invoiceImmediately;
+
+  private final Boolean overrideRelationship;
+
+  private final Timestamp changesScheduledAt;
+
+  private final ChangeOption changeOption;
+
+  private final Integer contractTermBillingCycleOnRenewal;
+
+  private final Integer freePeriod;
+
+  private final FreePeriodUnit freePeriodUnit;
+
+  private final TrialEndAction trialEndAction;
+
+  private final CardParams card;
+
+  private final PaymentMethodParams paymentMethod;
+
+  private final PaymentIntentParams paymentIntent;
+
+  private final BillingAddressParams billingAddress;
+
+  private final ShippingAddressParams shippingAddress;
+
+  private final StatementDescriptorParams statementDescriptor;
+
+  private final CustomerParams customer;
+
+  private final ContractTermParams contractTerm;
+
+  private final List<AddonsParams> addons;
+
+  private final List<EventBasedAddonsParams> eventBasedAddons;
+
+  private final List<CouponsParams> coupons;
+
+  private final Map<String, String> customFields;
+
+  private SubscriptionUpdateParams(SubscriptionUpdateBuilder builder) {
+
+    this.planId = builder.planId;
+
+    this.planQuantity = builder.planQuantity;
+
+    this.planUnitPrice = builder.planUnitPrice;
+
+    this.setupFee = builder.setupFee;
+
+    this.replaceAddonList = builder.replaceAddonList;
+
+    this.mandatoryAddonsToRemove = builder.mandatoryAddonsToRemove;
+
+    this.planQuantityInDecimal = builder.planQuantityInDecimal;
+
+    this.planUnitPriceInDecimal = builder.planUnitPriceInDecimal;
+
+    this.invoiceDate = builder.invoiceDate;
+
+    this.startDate = builder.startDate;
+
+    this.trialEnd = builder.trialEnd;
+
+    this.billingCycles = builder.billingCycles;
+
+    this.coupon = builder.coupon;
+
+    this.termsToCharge = builder.termsToCharge;
+
+    this.reactivateFrom = builder.reactivateFrom;
+
+    this.billingAlignmentMode = builder.billingAlignmentMode;
+
+    this.autoCollection = builder.autoCollection;
+
+    this.offlinePaymentMethod = builder.offlinePaymentMethod;
+
+    this.poNumber = builder.poNumber;
+
+    this.couponIds = builder.couponIds;
+
+    this.replaceCouponList = builder.replaceCouponList;
+
+    this.prorate = builder.prorate;
+
+    this.endOfTerm = builder.endOfTerm;
+
+    this.forceTermReset = builder.forceTermReset;
+
+    this.reactivate = builder.reactivate;
+
+    this.tokenId = builder.tokenId;
+
+    this.invoiceNotes = builder.invoiceNotes;
+
+    this.metaData = builder.metaData;
+
+    this.invoiceImmediately = builder.invoiceImmediately;
+
+    this.overrideRelationship = builder.overrideRelationship;
+
+    this.changesScheduledAt = builder.changesScheduledAt;
+
+    this.changeOption = builder.changeOption;
+
+    this.contractTermBillingCycleOnRenewal = builder.contractTermBillingCycleOnRenewal;
+
+    this.freePeriod = builder.freePeriod;
+
+    this.freePeriodUnit = builder.freePeriodUnit;
+
+    this.trialEndAction = builder.trialEndAction;
+
+    this.card = builder.card;
+
+    this.paymentMethod = builder.paymentMethod;
+
+    this.paymentIntent = builder.paymentIntent;
+
+    this.billingAddress = builder.billingAddress;
+
+    this.shippingAddress = builder.shippingAddress;
+
+    this.statementDescriptor = builder.statementDescriptor;
+
+    this.customer = builder.customer;
+
+    this.contractTerm = builder.contractTerm;
+
+    this.addons = builder.addons;
+
+    this.eventBasedAddons = builder.eventBasedAddons;
+
+    this.coupons = builder.coupons;
+
+    this.customFields =
+        builder.customFields.isEmpty()
+            ? Collections.emptyMap()
+            : Collections.unmodifiableMap(new LinkedHashMap<>(builder.customFields));
+  }
+
+  public String getPlanId() {
+    return planId;
+  }
+
+  public Integer getPlanQuantity() {
+    return planQuantity;
+  }
+
+  public Long getPlanUnitPrice() {
+    return planUnitPrice;
+  }
+
+  public Long getSetupFee() {
+    return setupFee;
+  }
+
+  public Boolean getReplaceAddonList() {
+    return replaceAddonList;
+  }
+
+  public List<String> getMandatoryAddonsToRemove() {
+    return mandatoryAddonsToRemove;
+  }
+
+  public String getPlanQuantityInDecimal() {
+    return planQuantityInDecimal;
+  }
+
+  public String getPlanUnitPriceInDecimal() {
+    return planUnitPriceInDecimal;
+  }
+
+  public Timestamp getInvoiceDate() {
+    return invoiceDate;
+  }
+
+  public Timestamp getStartDate() {
+    return startDate;
+  }
+
+  public Timestamp getTrialEnd() {
+    return trialEnd;
+  }
+
+  public Integer getBillingCycles() {
+    return billingCycles;
+  }
+
+  public String getCoupon() {
+    return coupon;
+  }
+
+  public Integer getTermsToCharge() {
+    return termsToCharge;
+  }
+
+  public Timestamp getReactivateFrom() {
+    return reactivateFrom;
+  }
+
+  public BillingAlignmentMode getBillingAlignmentMode() {
+    return billingAlignmentMode;
+  }
+
+  public AutoCollection getAutoCollection() {
+    return autoCollection;
+  }
+
+  public OfflinePaymentMethod getOfflinePaymentMethod() {
+    return offlinePaymentMethod;
+  }
+
+  public String getPoNumber() {
+    return poNumber;
+  }
+
+  public List<String> getCouponIds() {
+    return couponIds;
+  }
+
+  public Boolean getReplaceCouponList() {
+    return replaceCouponList;
+  }
+
+  public Boolean getProrate() {
+    return prorate;
+  }
+
+  public Boolean getEndOfTerm() {
+    return endOfTerm;
+  }
+
+  public Boolean getForceTermReset() {
+    return forceTermReset;
+  }
+
+  public Boolean getReactivate() {
+    return reactivate;
+  }
+
+  public String getTokenId() {
+    return tokenId;
+  }
+
+  public String getInvoiceNotes() {
+    return invoiceNotes;
+  }
+
+  public java.util.Map<String, Object> getMetaData() {
+    return metaData;
+  }
+
+  public Boolean getInvoiceImmediately() {
+    return invoiceImmediately;
+  }
+
+  public Boolean getOverrideRelationship() {
+    return overrideRelationship;
+  }
+
+  public Timestamp getChangesScheduledAt() {
+    return changesScheduledAt;
+  }
+
+  public ChangeOption getChangeOption() {
+    return changeOption;
+  }
+
+  public Integer getContractTermBillingCycleOnRenewal() {
+    return contractTermBillingCycleOnRenewal;
+  }
+
+  public Integer getFreePeriod() {
+    return freePeriod;
+  }
+
+  public FreePeriodUnit getFreePeriodUnit() {
+    return freePeriodUnit;
+  }
+
+  public TrialEndAction getTrialEndAction() {
+    return trialEndAction;
+  }
+
+  public CardParams getCard() {
+    return card;
+  }
+
+  public PaymentMethodParams getPaymentMethod() {
+    return paymentMethod;
+  }
+
+  public PaymentIntentParams getPaymentIntent() {
+    return paymentIntent;
+  }
+
+  public BillingAddressParams getBillingAddress() {
+    return billingAddress;
+  }
+
+  public ShippingAddressParams getShippingAddress() {
+    return shippingAddress;
+  }
+
+  public StatementDescriptorParams getStatementDescriptor() {
+    return statementDescriptor;
+  }
+
+  public CustomerParams getCustomer() {
+    return customer;
+  }
+
+  public ContractTermParams getContractTerm() {
+    return contractTerm;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<EventBasedAddonsParams> getEventBasedAddons() {
+    return eventBasedAddons;
+  }
+
+  public List<CouponsParams> getCoupons() {
+    return coupons;
+  }
+
+  public Map<String, String> customFields() {
+    return customFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.planId != null) {
+
+      formData.put("plan_id", this.planId);
+    }
+
+    if (this.planQuantity != null) {
+
+      formData.put("plan_quantity", this.planQuantity);
+    }
+
+    if (this.planUnitPrice != null) {
+
+      formData.put("plan_unit_price", this.planUnitPrice);
+    }
+
+    if (this.setupFee != null) {
+
+      formData.put("setup_fee", this.setupFee);
+    }
+
+    if (this.replaceAddonList != null) {
+
+      formData.put("replace_addon_list", this.replaceAddonList);
+    }
+
+    if (this.mandatoryAddonsToRemove != null) {
+
+      formData.put("mandatory_addons_to_remove", this.mandatoryAddonsToRemove);
+    }
+
+    if (this.planQuantityInDecimal != null) {
+
+      formData.put("plan_quantity_in_decimal", this.planQuantityInDecimal);
+    }
+
+    if (this.planUnitPriceInDecimal != null) {
+
+      formData.put("plan_unit_price_in_decimal", this.planUnitPriceInDecimal);
+    }
+
+    if (this.invoiceDate != null) {
+
+      formData.put("invoice_date", this.invoiceDate);
+    }
+
+    if (this.startDate != null) {
+
+      formData.put("start_date", this.startDate);
+    }
+
+    if (this.trialEnd != null) {
+
+      formData.put("trial_end", this.trialEnd);
+    }
+
+    if (this.billingCycles != null) {
+
+      formData.put("billing_cycles", this.billingCycles);
+    }
+
+    if (this.coupon != null) {
+
+      formData.put("coupon", this.coupon);
+    }
+
+    if (this.termsToCharge != null) {
+
+      formData.put("terms_to_charge", this.termsToCharge);
+    }
+
+    if (this.reactivateFrom != null) {
+
+      formData.put("reactivate_from", this.reactivateFrom);
+    }
+
+    if (this.billingAlignmentMode != null) {
+
+      formData.put("billing_alignment_mode", this.billingAlignmentMode);
+    }
+
+    if (this.autoCollection != null) {
+
+      formData.put("auto_collection", this.autoCollection);
+    }
+
+    if (this.offlinePaymentMethod != null) {
+
+      formData.put("offline_payment_method", this.offlinePaymentMethod);
+    }
+
+    if (this.poNumber != null) {
+
+      formData.put("po_number", this.poNumber);
+    }
+
+    if (this.couponIds != null) {
+
+      formData.put("coupon_ids", this.couponIds);
+    }
+
+    if (this.replaceCouponList != null) {
+
+      formData.put("replace_coupon_list", this.replaceCouponList);
+    }
+
+    if (this.prorate != null) {
+
+      formData.put("prorate", this.prorate);
+    }
+
+    if (this.endOfTerm != null) {
+
+      formData.put("end_of_term", this.endOfTerm);
+    }
+
+    if (this.forceTermReset != null) {
+
+      formData.put("force_term_reset", this.forceTermReset);
+    }
+
+    if (this.reactivate != null) {
+
+      formData.put("reactivate", this.reactivate);
+    }
+
+    if (this.tokenId != null) {
+
+      formData.put("token_id", this.tokenId);
+    }
+
+    if (this.invoiceNotes != null) {
+
+      formData.put("invoice_notes", this.invoiceNotes);
+    }
+
+    if (this.metaData != null) {
+
+      formData.put("meta_data", JsonUtil.toJson(this.metaData));
+    }
+
+    if (this.invoiceImmediately != null) {
+
+      formData.put("invoice_immediately", this.invoiceImmediately);
+    }
+
+    if (this.overrideRelationship != null) {
+
+      formData.put("override_relationship", this.overrideRelationship);
+    }
+
+    if (this.changesScheduledAt != null) {
+
+      formData.put("changes_scheduled_at", this.changesScheduledAt);
+    }
+
+    if (this.changeOption != null) {
+
+      formData.put("change_option", this.changeOption);
+    }
+
+    if (this.contractTermBillingCycleOnRenewal != null) {
+
+      formData.put(
+          "contract_term_billing_cycle_on_renewal", this.contractTermBillingCycleOnRenewal);
+    }
+
+    if (this.freePeriod != null) {
+
+      formData.put("free_period", this.freePeriod);
+    }
+
+    if (this.freePeriodUnit != null) {
+
+      formData.put("free_period_unit", this.freePeriodUnit);
+    }
+
+    if (this.trialEndAction != null) {
+
+      formData.put("trial_end_action", this.trialEndAction);
+    }
+
+    if (this.card != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.card.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "card[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentMethod != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentMethod.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_method[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.paymentIntent != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.paymentIntent.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "payment_intent[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.billingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.billingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "billing_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.shippingAddress != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.shippingAddress.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "shipping_address[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.statementDescriptor != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.statementDescriptor.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "statement_descriptor[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.customer != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.customer.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "customer[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.contractTerm != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.contractTerm.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "contract_term[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.eventBasedAddons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.eventBasedAddons.size(); i++) {
+        EventBasedAddonsParams item = this.eventBasedAddons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "event_based_addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.coupons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.coupons.size(); i++) {
+        CouponsParams item = this.coupons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "coupons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    formData.putAll(customFields);
+
+    return formData;
+  }
+
+  /** Create a new builder for SubscriptionUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionUpdateBuilder builder() {
+    return new SubscriptionUpdateBuilder();
+  }
+
+  public static final class SubscriptionUpdateBuilder {
+
+    private String planId;
+
+    private Integer planQuantity;
+
+    private Long planUnitPrice;
+
+    private Long setupFee;
+
+    private Boolean replaceAddonList;
+
+    private List<String> mandatoryAddonsToRemove;
+
+    private String planQuantityInDecimal;
+
+    private String planUnitPriceInDecimal;
+
+    private Timestamp invoiceDate;
+
+    private Timestamp startDate;
+
+    private Timestamp trialEnd;
+
+    private Integer billingCycles;
+
+    private String coupon;
+
+    private Integer termsToCharge;
+
+    private Timestamp reactivateFrom;
+
+    private BillingAlignmentMode billingAlignmentMode;
+
+    private AutoCollection autoCollection;
+
+    private OfflinePaymentMethod offlinePaymentMethod;
+
+    private String poNumber;
+
+    private List<String> couponIds;
+
+    private Boolean replaceCouponList;
+
+    private Boolean prorate;
+
+    private Boolean endOfTerm;
+
+    private Boolean forceTermReset;
+
+    private Boolean reactivate;
+
+    private String tokenId;
+
+    private String invoiceNotes;
+
+    private java.util.Map<String, Object> metaData;
+
+    private Boolean invoiceImmediately;
+
+    private Boolean overrideRelationship;
+
+    private Timestamp changesScheduledAt;
+
+    private ChangeOption changeOption;
+
+    private Integer contractTermBillingCycleOnRenewal;
+
+    private Integer freePeriod;
+
+    private FreePeriodUnit freePeriodUnit;
+
+    private TrialEndAction trialEndAction;
+
+    private CardParams card;
+
+    private PaymentMethodParams paymentMethod;
+
+    private PaymentIntentParams paymentIntent;
+
+    private BillingAddressParams billingAddress;
+
+    private ShippingAddressParams shippingAddress;
+
+    private StatementDescriptorParams statementDescriptor;
+
+    private CustomerParams customer;
+
+    private ContractTermParams contractTerm;
+
+    private List<AddonsParams> addons;
+
+    private List<EventBasedAddonsParams> eventBasedAddons;
+
+    private List<CouponsParams> coupons;
+
+    private Map<String, String> customFields = new LinkedHashMap<>();
+
+    private SubscriptionUpdateBuilder() {}
+
+    public SubscriptionUpdateBuilder planId(String value) {
+      this.planId = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder planQuantity(Integer value) {
+      this.planQuantity = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder planUnitPrice(Long value) {
+      this.planUnitPrice = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder setupFee(Long value) {
+      this.setupFee = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder replaceAddonList(Boolean value) {
+      this.replaceAddonList = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder mandatoryAddonsToRemove(List<String> value) {
+      this.mandatoryAddonsToRemove = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder planQuantityInDecimal(String value) {
+      this.planQuantityInDecimal = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder planUnitPriceInDecimal(String value) {
+      this.planUnitPriceInDecimal = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder invoiceDate(Timestamp value) {
+      this.invoiceDate = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder startDate(Timestamp value) {
+      this.startDate = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder trialEnd(Timestamp value) {
+      this.trialEnd = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder billingCycles(Integer value) {
+      this.billingCycles = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionUpdateBuilder coupon(String value) {
+      this.coupon = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder termsToCharge(Integer value) {
+      this.termsToCharge = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder reactivateFrom(Timestamp value) {
+      this.reactivateFrom = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder billingAlignmentMode(BillingAlignmentMode value) {
+      this.billingAlignmentMode = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder autoCollection(AutoCollection value) {
+      this.autoCollection = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder offlinePaymentMethod(OfflinePaymentMethod value) {
+      this.offlinePaymentMethod = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder poNumber(String value) {
+      this.poNumber = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder couponIds(List<String> value) {
+      this.couponIds = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder replaceCouponList(Boolean value) {
+      this.replaceCouponList = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder prorate(Boolean value) {
+      this.prorate = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder endOfTerm(Boolean value) {
+      this.endOfTerm = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder forceTermReset(Boolean value) {
+      this.forceTermReset = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder reactivate(Boolean value) {
+      this.reactivate = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder tokenId(String value) {
+      this.tokenId = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder invoiceNotes(String value) {
+      this.invoiceNotes = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder metaData(java.util.Map<String, Object> value) {
+      this.metaData = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder invoiceImmediately(Boolean value) {
+      this.invoiceImmediately = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder overrideRelationship(Boolean value) {
+      this.overrideRelationship = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder changesScheduledAt(Timestamp value) {
+      this.changesScheduledAt = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder changeOption(ChangeOption value) {
+      this.changeOption = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder contractTermBillingCycleOnRenewal(Integer value) {
+      this.contractTermBillingCycleOnRenewal = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder freePeriod(Integer value) {
+      this.freePeriod = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder freePeriodUnit(FreePeriodUnit value) {
+      this.freePeriodUnit = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder trialEndAction(TrialEndAction value) {
+      this.trialEndAction = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder card(CardParams value) {
+      this.card = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder paymentMethod(PaymentMethodParams value) {
+      this.paymentMethod = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder paymentIntent(PaymentIntentParams value) {
+      this.paymentIntent = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder billingAddress(BillingAddressParams value) {
+      this.billingAddress = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder shippingAddress(ShippingAddressParams value) {
+      this.shippingAddress = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder statementDescriptor(StatementDescriptorParams value) {
+      this.statementDescriptor = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder customer(CustomerParams value) {
+      this.customer = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder contractTerm(ContractTermParams value) {
+      this.contractTerm = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public SubscriptionUpdateBuilder eventBasedAddons(List<EventBasedAddonsParams> value) {
+      this.eventBasedAddons = value;
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionUpdateBuilder coupons(List<CouponsParams> value) {
+      this.coupons = value;
+      return this;
+    }
+
+    /**
+     * Add a custom field to the request. Custom fields must start with "cf_".
+     *
+     * @param fieldName the name of the custom field (e.g., "cf_custom_field_name")
+     * @param value the value of the custom field
+     * @return this builder
+     * @throws IllegalArgumentException if fieldName doesn't start with "cf_"
+     */
+    public SubscriptionUpdateBuilder customField(String fieldName, String value) {
+      if (fieldName == null || !fieldName.startsWith("cf_")) {
+        throw new IllegalArgumentException("Custom field name must start with 'cf_'");
+      }
+      this.customFields.put(fieldName, value);
+      return this;
+    }
+
+    /**
+     * Add multiple custom fields to the request. All field names must start with "cf_".
+     *
+     * @param customFields map of custom field names to values
+     * @return this builder
+     * @throws IllegalArgumentException if any field name doesn't start with "cf_"
+     */
+    public SubscriptionUpdateBuilder customFields(Map<String, String> customFields) {
+      if (customFields != null) {
+        for (Map.Entry<String, String> entry : customFields.entrySet()) {
+          if (entry.getKey() == null || !entry.getKey().startsWith("cf_")) {
+            throw new IllegalArgumentException(
+                "Custom field name must start with 'cf_': " + entry.getKey());
+          }
+          this.customFields.put(entry.getKey(), entry.getValue());
+        }
+      }
+      return this;
+    }
+
+    public SubscriptionUpdateParams build() {
+      return new SubscriptionUpdateParams(this);
+    }
+  }
+
+  public enum BillingAlignmentMode {
+    IMMEDIATE("immediate"),
+
+    DELAYED("delayed"),
+
+    /**
+     * An enum member indicating that BillingAlignmentMode was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    BillingAlignmentMode(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static BillingAlignmentMode fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (BillingAlignmentMode enumValue : BillingAlignmentMode.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum AutoCollection {
+    ON("on"),
+
+    OFF("off"),
+
+    /** An enum member indicating that AutoCollection was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    AutoCollection(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static AutoCollection fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (AutoCollection enumValue : AutoCollection.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum OfflinePaymentMethod {
+    NO_PREFERENCE("no_preference"),
+
+    CASH("cash"),
+
+    CHECK("check"),
+
+    BANK_TRANSFER("bank_transfer"),
+
+    ACH_CREDIT("ach_credit"),
+
+    SEPA_CREDIT("sepa_credit"),
+
+    BOLETO("boleto"),
+
+    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+    UK_AUTOMATED_BANK_TRANSFER("uk_automated_bank_transfer"),
+
+    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+    CUSTOM("custom"),
+
+    /**
+     * An enum member indicating that OfflinePaymentMethod was instantiated with an unknown value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    OfflinePaymentMethod(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static OfflinePaymentMethod fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (OfflinePaymentMethod enumValue : OfflinePaymentMethod.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChangeOption {
+    IMMEDIATELY("immediately"),
+
+    END_OF_TERM("end_of_term"),
+
+    SPECIFIC_DATE("specific_date"),
+
+    /** An enum member indicating that ChangeOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChangeOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChangeOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChangeOption enumValue : ChangeOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum FreePeriodUnit {
+    DAY("day"),
+
+    WEEK("week"),
+
+    MONTH("month"),
+
+    YEAR("year"),
+
+    /** An enum member indicating that FreePeriodUnit was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    FreePeriodUnit(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static FreePeriodUnit fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (FreePeriodUnit enumValue : FreePeriodUnit.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum TrialEndAction {
+    SITE_DEFAULT("site_default"),
+
+    PLAN_DEFAULT("plan_default"),
+
+    ACTIVATE_SUBSCRIPTION("activate_subscription"),
+
+    CANCEL_SUBSCRIPTION("cancel_subscription"),
+
+    /** An enum member indicating that TrialEndAction was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    TrialEndAction(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static TrialEndAction fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (TrialEndAction enumValue : TrialEndAction.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class CardParams {
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String tmpToken;
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String number;
+
+    private final Integer expiryMonth;
+
+    private final Integer expiryYear;
+
+    private final String cvv;
+
+    private final PreferredScheme preferredScheme;
+
+    private final String billingAddr1;
+
+    private final String billingAddr2;
+
+    private final String billingCity;
+
+    private final String billingStateCode;
+
+    private final String billingState;
+
+    private final String billingZip;
+
+    private final String billingCountry;
+
+    private final String ipAddress;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private CardParams(CardBuilder builder) {
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.number = builder.number;
+
+      this.expiryMonth = builder.expiryMonth;
+
+      this.expiryYear = builder.expiryYear;
+
+      this.cvv = builder.cvv;
+
+      this.preferredScheme = builder.preferredScheme;
+
+      this.billingAddr1 = builder.billingAddr1;
+
+      this.billingAddr2 = builder.billingAddr2;
+
+      this.billingCity = builder.billingCity;
+
+      this.billingStateCode = builder.billingStateCode;
+
+      this.billingState = builder.billingState;
+
+      this.billingZip = builder.billingZip;
+
+      this.billingCountry = builder.billingCountry;
+
+      this.ipAddress = builder.ipAddress;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getNumber() {
+      return number;
+    }
+
+    public Integer getExpiryMonth() {
+      return expiryMonth;
+    }
+
+    public Integer getExpiryYear() {
+      return expiryYear;
+    }
+
+    public String getCvv() {
+      return cvv;
+    }
+
+    public PreferredScheme getPreferredScheme() {
+      return preferredScheme;
+    }
+
+    public String getBillingAddr1() {
+      return billingAddr1;
+    }
+
+    public String getBillingAddr2() {
+      return billingAddr2;
+    }
+
+    public String getBillingCity() {
+      return billingCity;
+    }
+
+    public String getBillingStateCode() {
+      return billingStateCode;
+    }
+
+    public String getBillingState() {
+      return billingState;
+    }
+
+    public String getBillingZip() {
+      return billingZip;
+    }
+
+    public String getBillingCountry() {
+      return billingCountry;
+    }
+
+    public String getIpAddress() {
+      return ipAddress;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.number != null) {
+
+        formData.put("number", this.number);
+      }
+
+      if (this.expiryMonth != null) {
+
+        formData.put("expiry_month", this.expiryMonth);
+      }
+
+      if (this.expiryYear != null) {
+
+        formData.put("expiry_year", this.expiryYear);
+      }
+
+      if (this.cvv != null) {
+
+        formData.put("cvv", this.cvv);
+      }
+
+      if (this.preferredScheme != null) {
+
+        formData.put("preferred_scheme", this.preferredScheme);
+      }
+
+      if (this.billingAddr1 != null) {
+
+        formData.put("billing_addr1", this.billingAddr1);
+      }
+
+      if (this.billingAddr2 != null) {
+
+        formData.put("billing_addr2", this.billingAddr2);
+      }
+
+      if (this.billingCity != null) {
+
+        formData.put("billing_city", this.billingCity);
+      }
+
+      if (this.billingStateCode != null) {
+
+        formData.put("billing_state_code", this.billingStateCode);
+      }
+
+      if (this.billingState != null) {
+
+        formData.put("billing_state", this.billingState);
+      }
+
+      if (this.billingZip != null) {
+
+        formData.put("billing_zip", this.billingZip);
+      }
+
+      if (this.billingCountry != null) {
+
+        formData.put("billing_country", this.billingCountry);
+      }
+
+      if (this.ipAddress != null) {
+
+        formData.put("ip_address", this.ipAddress);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CardParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CardBuilder builder() {
+      return new CardBuilder();
+    }
+
+    public static final class CardBuilder {
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String tmpToken;
+
+      private String firstName;
+
+      private String lastName;
+
+      private String number;
+
+      private Integer expiryMonth;
+
+      private Integer expiryYear;
+
+      private String cvv;
+
+      private PreferredScheme preferredScheme;
+
+      private String billingAddr1;
+
+      private String billingAddr2;
+
+      private String billingCity;
+
+      private String billingStateCode;
+
+      private String billingState;
+
+      private String billingZip;
+
+      private String billingCountry;
+
+      private String ipAddress;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private CardBuilder() {}
+
+      @Deprecated
+      public CardBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public CardBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      @Deprecated
+      public CardBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public CardBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public CardBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public CardBuilder number(String value) {
+        this.number = value;
+        return this;
+      }
+
+      public CardBuilder expiryMonth(Integer value) {
+        this.expiryMonth = value;
+        return this;
+      }
+
+      public CardBuilder expiryYear(Integer value) {
+        this.expiryYear = value;
+        return this;
+      }
+
+      public CardBuilder cvv(String value) {
+        this.cvv = value;
+        return this;
+      }
+
+      public CardBuilder preferredScheme(PreferredScheme value) {
+        this.preferredScheme = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr1(String value) {
+        this.billingAddr1 = value;
+        return this;
+      }
+
+      public CardBuilder billingAddr2(String value) {
+        this.billingAddr2 = value;
+        return this;
+      }
+
+      public CardBuilder billingCity(String value) {
+        this.billingCity = value;
+        return this;
+      }
+
+      public CardBuilder billingStateCode(String value) {
+        this.billingStateCode = value;
+        return this;
+      }
+
+      public CardBuilder billingState(String value) {
+        this.billingState = value;
+        return this;
+      }
+
+      public CardBuilder billingZip(String value) {
+        this.billingZip = value;
+        return this;
+      }
+
+      public CardBuilder billingCountry(String value) {
+        this.billingCountry = value;
+        return this;
+      }
+
+      @Deprecated
+      public CardBuilder ipAddress(String value) {
+        this.ipAddress = value;
+        return this;
+      }
+
+      public CardBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public CardParams build() {
+        return new CardParams(this);
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE("chargebee"),
+
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum PreferredScheme {
+      CARTES_BANCAIRES("cartes_bancaires"),
+
+      MASTERCARD("mastercard"),
+
+      VISA("visa"),
+
+      /** An enum member indicating that PreferredScheme was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PreferredScheme(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PreferredScheme fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PreferredScheme enumValue : PreferredScheme.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentMethodParams {
+
+    private final Type type;
+
+    private final Gateway gateway;
+
+    private final String gatewayAccountId;
+
+    private final String referenceId;
+
+    private final String tmpToken;
+
+    private final String issuingCountry;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentMethodParams(PaymentMethodBuilder builder) {
+
+      this.type = builder.type;
+
+      this.gateway = builder.gateway;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.referenceId = builder.referenceId;
+
+      this.tmpToken = builder.tmpToken;
+
+      this.issuingCountry = builder.issuingCountry;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public Type getType() {
+      return type;
+    }
+
+    public Gateway getGateway() {
+      return gateway;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getTmpToken() {
+      return tmpToken;
+    }
+
+    public String getIssuingCountry() {
+      return issuingCountry;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.type != null) {
+
+        formData.put("type", this.type);
+      }
+
+      if (this.gateway != null) {
+
+        formData.put("gateway", this.gateway);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.tmpToken != null) {
+
+        formData.put("tmp_token", this.tmpToken);
+      }
+
+      if (this.issuingCountry != null) {
+
+        formData.put("issuing_country", this.issuingCountry);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentMethodParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentMethodBuilder builder() {
+      return new PaymentMethodBuilder();
+    }
+
+    public static final class PaymentMethodBuilder {
+
+      private Type type;
+
+      private Gateway gateway;
+
+      private String gatewayAccountId;
+
+      private String referenceId;
+
+      private String tmpToken;
+
+      private String issuingCountry;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentMethodBuilder() {}
+
+      public PaymentMethodBuilder type(Type value) {
+        this.type = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentMethodBuilder gateway(Gateway value) {
+        this.gateway = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder tmpToken(String value) {
+        this.tmpToken = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder issuingCountry(String value) {
+        this.issuingCountry = value;
+        return this;
+      }
+
+      public PaymentMethodBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentMethodParams build() {
+        return new PaymentMethodParams(this);
+      }
+    }
+
+    public enum Type {
+      CARD("card"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      GENERIC("generic"),
+
+      ALIPAY("alipay"),
+
+      UNIONPAY("unionpay"),
+
+      APPLE_PAY("apple_pay"),
+
+      WECHAT_PAY("wechat_pay"),
+
+      IDEAL("ideal"),
+
+      GOOGLE_PAY("google_pay"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GIROPAY("giropay"),
+
+      DOTPAY("dotpay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      VENMO("venmo"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      AUTOMATED_BANK_TRANSFER("automated_bank_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /** An enum member indicating that Type was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Type(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Type fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Type enumValue : Type.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum Gateway {
+      CHARGEBEE_PAYMENTS("chargebee_payments"),
+
+      ADYEN("adyen"),
+
+      STRIPE("stripe"),
+
+      WEPAY("wepay"),
+
+      BRAINTREE("braintree"),
+
+      AUTHORIZE_NET("authorize_net"),
+
+      PAYPAL_PRO("paypal_pro"),
+
+      PIN("pin"),
+
+      EWAY("eway"),
+
+      EWAY_RAPID("eway_rapid"),
+
+      WORLDPAY("worldpay"),
+
+      BALANCED_PAYMENTS("balanced_payments"),
+
+      BEANSTREAM("beanstream"),
+
+      BLUEPAY("bluepay"),
+
+      ELAVON("elavon"),
+
+      FIRST_DATA_GLOBAL("first_data_global"),
+
+      HDFC("hdfc"),
+
+      MIGS("migs"),
+
+      NMI("nmi"),
+
+      OGONE("ogone"),
+
+      PAYMILL("paymill"),
+
+      PAYPAL_PAYFLOW_PRO("paypal_payflow_pro"),
+
+      SAGE_PAY("sage_pay"),
+
+      TCO("tco"),
+
+      WIRECARD("wirecard"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      GOCARDLESS("gocardless"),
+
+      ORBITAL("orbital"),
+
+      MONERIS_US("moneris_us"),
+
+      MONERIS("moneris"),
+
+      BLUESNAP("bluesnap"),
+
+      CYBERSOURCE("cybersource"),
+
+      VANTIV("vantiv"),
+
+      CHECKOUT_COM("checkout_com"),
+
+      PAYPAL("paypal"),
+
+      INGENICO_DIRECT("ingenico_direct"),
+
+      EXACT("exact"),
+
+      MOLLIE("mollie"),
+
+      QUICKBOOKS("quickbooks"),
+
+      RAZORPAY("razorpay"),
+
+      GLOBAL_PAYMENTS("global_payments"),
+
+      BANK_OF_AMERICA("bank_of_america"),
+
+      ECENTRIC("ecentric"),
+
+      METRICS_GLOBAL("metrics_global"),
+
+      WINDCAVE("windcave"),
+
+      PAY_COM("pay_com"),
+
+      EBANX("ebanx"),
+
+      DLOCAL("dlocal"),
+
+      NUVEI("nuvei"),
+
+      SOLIDGATE("solidgate"),
+
+      PAYSTACK("paystack"),
+
+      JP_MORGAN("jp_morgan"),
+
+      DEUTSCHE_BANK("deutsche_bank"),
+
+      EZIDEBIT("ezidebit"),
+
+      /** An enum member indicating that Gateway was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      Gateway(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static Gateway fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (Gateway enumValue : Gateway.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class PaymentIntentParams {
+
+    private final String id;
+
+    private final String gatewayAccountId;
+
+    private final String gwToken;
+
+    private final PaymentMethodType paymentMethodType;
+
+    private final String referenceId;
+
+    private final String gwPaymentMethodId;
+
+    private final java.util.Map<String, Object> additionalInformation;
+
+    private PaymentIntentParams(PaymentIntentBuilder builder) {
+
+      this.id = builder.id;
+
+      this.gatewayAccountId = builder.gatewayAccountId;
+
+      this.gwToken = builder.gwToken;
+
+      this.paymentMethodType = builder.paymentMethodType;
+
+      this.referenceId = builder.referenceId;
+
+      this.gwPaymentMethodId = builder.gwPaymentMethodId;
+
+      this.additionalInformation = builder.additionalInformation;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public String getGatewayAccountId() {
+      return gatewayAccountId;
+    }
+
+    public String getGwToken() {
+      return gwToken;
+    }
+
+    public PaymentMethodType getPaymentMethodType() {
+      return paymentMethodType;
+    }
+
+    public String getReferenceId() {
+      return referenceId;
+    }
+
+    public String getGwPaymentMethodId() {
+      return gwPaymentMethodId;
+    }
+
+    public java.util.Map<String, Object> getAdditionalInformation() {
+      return additionalInformation;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.gatewayAccountId != null) {
+
+        formData.put("gateway_account_id", this.gatewayAccountId);
+      }
+
+      if (this.gwToken != null) {
+
+        formData.put("gw_token", this.gwToken);
+      }
+
+      if (this.paymentMethodType != null) {
+
+        formData.put("payment_method_type", this.paymentMethodType);
+      }
+
+      if (this.referenceId != null) {
+
+        formData.put("reference_id", this.referenceId);
+      }
+
+      if (this.gwPaymentMethodId != null) {
+
+        formData.put("gw_payment_method_id", this.gwPaymentMethodId);
+      }
+
+      if (this.additionalInformation != null) {
+
+        formData.put("additional_information", JsonUtil.toJson(this.additionalInformation));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for PaymentIntentParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static PaymentIntentBuilder builder() {
+      return new PaymentIntentBuilder();
+    }
+
+    public static final class PaymentIntentBuilder {
+
+      private String id;
+
+      private String gatewayAccountId;
+
+      private String gwToken;
+
+      private PaymentMethodType paymentMethodType;
+
+      private String referenceId;
+
+      private String gwPaymentMethodId;
+
+      private java.util.Map<String, Object> additionalInformation;
+
+      private PaymentIntentBuilder() {}
+
+      public PaymentIntentBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gatewayAccountId(String value) {
+        this.gatewayAccountId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder gwToken(String value) {
+        this.gwToken = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder paymentMethodType(PaymentMethodType value) {
+        this.paymentMethodType = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder referenceId(String value) {
+        this.referenceId = value;
+        return this;
+      }
+
+      @Deprecated
+      public PaymentIntentBuilder gwPaymentMethodId(String value) {
+        this.gwPaymentMethodId = value;
+        return this;
+      }
+
+      public PaymentIntentBuilder additionalInformation(java.util.Map<String, Object> value) {
+        this.additionalInformation = value;
+        return this;
+      }
+
+      public PaymentIntentParams build() {
+        return new PaymentIntentParams(this);
+      }
+    }
+
+    public enum PaymentMethodType {
+      CARD("card"),
+
+      IDEAL("ideal"),
+
+      SOFORT("sofort"),
+
+      BANCONTACT("bancontact"),
+
+      GOOGLE_PAY("google_pay"),
+
+      DOTPAY("dotpay"),
+
+      GIROPAY("giropay"),
+
+      APPLE_PAY("apple_pay"),
+
+      UPI("upi"),
+
+      NETBANKING_EMANDATES("netbanking_emandates"),
+
+      PAYPAL_EXPRESS_CHECKOUT("paypal_express_checkout"),
+
+      DIRECT_DEBIT("direct_debit"),
+
+      BOLETO("boleto"),
+
+      VENMO("venmo"),
+
+      AMAZON_PAYMENTS("amazon_payments"),
+
+      PAY_TO("pay_to"),
+
+      FASTER_PAYMENTS("faster_payments"),
+
+      SEPA_INSTANT_TRANSFER("sepa_instant_transfer"),
+
+      KLARNA_PAY_NOW("klarna_pay_now"),
+
+      ONLINE_BANKING_POLAND("online_banking_poland"),
+
+      PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
+
+      ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+      KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+      PAY_BY_BANK("pay_by_bank"),
+
+      TRUSTLY("trustly"),
+
+      STABLECOIN("stablecoin"),
+
+      /**
+       * An enum member indicating that PaymentMethodType was instantiated with an unknown value.
+       */
+      _UNKNOWN(null);
+      private final String value;
+
+      PaymentMethodType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PaymentMethodType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PaymentMethodType enumValue : PaymentMethodType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class BillingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private BillingAddressParams(BillingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for BillingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static BillingAddressBuilder builder() {
+      return new BillingAddressBuilder();
+    }
+
+    public static final class BillingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private BillingAddressBuilder() {}
+
+      public BillingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public BillingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public BillingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public BillingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public BillingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public BillingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public BillingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public BillingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public BillingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public BillingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public BillingAddressParams build() {
+        return new BillingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ShippingAddressParams {
+
+    private final String firstName;
+
+    private final String lastName;
+
+    private final String email;
+
+    private final String company;
+
+    private final String phone;
+
+    private final String line1;
+
+    private final String line2;
+
+    private final String line3;
+
+    private final String city;
+
+    private final String stateCode;
+
+    private final String state;
+
+    private final String zip;
+
+    private final String country;
+
+    private final ValidationStatus validationStatus;
+
+    private ShippingAddressParams(ShippingAddressBuilder builder) {
+
+      this.firstName = builder.firstName;
+
+      this.lastName = builder.lastName;
+
+      this.email = builder.email;
+
+      this.company = builder.company;
+
+      this.phone = builder.phone;
+
+      this.line1 = builder.line1;
+
+      this.line2 = builder.line2;
+
+      this.line3 = builder.line3;
+
+      this.city = builder.city;
+
+      this.stateCode = builder.stateCode;
+
+      this.state = builder.state;
+
+      this.zip = builder.zip;
+
+      this.country = builder.country;
+
+      this.validationStatus = builder.validationStatus;
+    }
+
+    public String getFirstName() {
+      return firstName;
+    }
+
+    public String getLastName() {
+      return lastName;
+    }
+
+    public String getEmail() {
+      return email;
+    }
+
+    public String getCompany() {
+      return company;
+    }
+
+    public String getPhone() {
+      return phone;
+    }
+
+    public String getLine1() {
+      return line1;
+    }
+
+    public String getLine2() {
+      return line2;
+    }
+
+    public String getLine3() {
+      return line3;
+    }
+
+    public String getCity() {
+      return city;
+    }
+
+    public String getStateCode() {
+      return stateCode;
+    }
+
+    public String getState() {
+      return state;
+    }
+
+    public String getZip() {
+      return zip;
+    }
+
+    public String getCountry() {
+      return country;
+    }
+
+    public ValidationStatus getValidationStatus() {
+      return validationStatus;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.firstName != null) {
+
+        formData.put("first_name", this.firstName);
+      }
+
+      if (this.lastName != null) {
+
+        formData.put("last_name", this.lastName);
+      }
+
+      if (this.email != null) {
+
+        formData.put("email", this.email);
+      }
+
+      if (this.company != null) {
+
+        formData.put("company", this.company);
+      }
+
+      if (this.phone != null) {
+
+        formData.put("phone", this.phone);
+      }
+
+      if (this.line1 != null) {
+
+        formData.put("line1", this.line1);
+      }
+
+      if (this.line2 != null) {
+
+        formData.put("line2", this.line2);
+      }
+
+      if (this.line3 != null) {
+
+        formData.put("line3", this.line3);
+      }
+
+      if (this.city != null) {
+
+        formData.put("city", this.city);
+      }
+
+      if (this.stateCode != null) {
+
+        formData.put("state_code", this.stateCode);
+      }
+
+      if (this.state != null) {
+
+        formData.put("state", this.state);
+      }
+
+      if (this.zip != null) {
+
+        formData.put("zip", this.zip);
+      }
+
+      if (this.country != null) {
+
+        formData.put("country", this.country);
+      }
+
+      if (this.validationStatus != null) {
+
+        formData.put("validation_status", this.validationStatus);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ShippingAddressParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ShippingAddressBuilder builder() {
+      return new ShippingAddressBuilder();
+    }
+
+    public static final class ShippingAddressBuilder {
+
+      private String firstName;
+
+      private String lastName;
+
+      private String email;
+
+      private String company;
+
+      private String phone;
+
+      private String line1;
+
+      private String line2;
+
+      private String line3;
+
+      private String city;
+
+      private String stateCode;
+
+      private String state;
+
+      private String zip;
+
+      private String country;
+
+      private ValidationStatus validationStatus;
+
+      private ShippingAddressBuilder() {}
+
+      public ShippingAddressBuilder firstName(String value) {
+        this.firstName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder lastName(String value) {
+        this.lastName = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder email(String value) {
+        this.email = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder company(String value) {
+        this.company = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder phone(String value) {
+        this.phone = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line1(String value) {
+        this.line1 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line2(String value) {
+        this.line2 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder line3(String value) {
+        this.line3 = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder city(String value) {
+        this.city = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder stateCode(String value) {
+        this.stateCode = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder state(String value) {
+        this.state = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder zip(String value) {
+        this.zip = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder country(String value) {
+        this.country = value;
+        return this;
+      }
+
+      public ShippingAddressBuilder validationStatus(ValidationStatus value) {
+        this.validationStatus = value;
+        return this;
+      }
+
+      public ShippingAddressParams build() {
+        return new ShippingAddressParams(this);
+      }
+    }
+
+    public enum ValidationStatus {
+      NOT_VALIDATED("not_validated"),
+
+      VALID("valid"),
+
+      PARTIALLY_VALID("partially_valid"),
+
+      INVALID("invalid"),
+
+      /** An enum member indicating that ValidationStatus was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ValidationStatus(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ValidationStatus fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ValidationStatus enumValue : ValidationStatus.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class StatementDescriptorParams {
+
+    private final String descriptor;
+
+    private StatementDescriptorParams(StatementDescriptorBuilder builder) {
+
+      this.descriptor = builder.descriptor;
+    }
+
+    public String getDescriptor() {
+      return descriptor;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.descriptor != null) {
+
+        formData.put("descriptor", this.descriptor);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for StatementDescriptorParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static StatementDescriptorBuilder builder() {
+      return new StatementDescriptorBuilder();
+    }
+
+    public static final class StatementDescriptorBuilder {
+
+      private String descriptor;
+
+      private StatementDescriptorBuilder() {}
+
+      public StatementDescriptorBuilder descriptor(String value) {
+        this.descriptor = value;
+        return this;
+      }
+
+      public StatementDescriptorParams build() {
+        return new StatementDescriptorParams(this);
+      }
+    }
+  }
+
+  public static final class CustomerParams {
+
+    private final String vatNumber;
+
+    private final String vatNumberPrefix;
+
+    private final String entityIdentifierScheme;
+
+    private final Boolean isEinvoiceEnabled;
+
+    private final EinvoicingMethod einvoicingMethod;
+
+    private final String entityIdentifierStandard;
+
+    private final Boolean businessCustomerWithoutVatNumber;
+
+    private final Boolean registeredForGst;
+
+    private CustomerParams(CustomerBuilder builder) {
+
+      this.vatNumber = builder.vatNumber;
+
+      this.vatNumberPrefix = builder.vatNumberPrefix;
+
+      this.entityIdentifierScheme = builder.entityIdentifierScheme;
+
+      this.isEinvoiceEnabled = builder.isEinvoiceEnabled;
+
+      this.einvoicingMethod = builder.einvoicingMethod;
+
+      this.entityIdentifierStandard = builder.entityIdentifierStandard;
+
+      this.businessCustomerWithoutVatNumber = builder.businessCustomerWithoutVatNumber;
+
+      this.registeredForGst = builder.registeredForGst;
+    }
+
+    public String getVatNumber() {
+      return vatNumber;
+    }
+
+    public String getVatNumberPrefix() {
+      return vatNumberPrefix;
+    }
+
+    public String getEntityIdentifierScheme() {
+      return entityIdentifierScheme;
+    }
+
+    public Boolean getIsEinvoiceEnabled() {
+      return isEinvoiceEnabled;
+    }
+
+    public EinvoicingMethod getEinvoicingMethod() {
+      return einvoicingMethod;
+    }
+
+    public String getEntityIdentifierStandard() {
+      return entityIdentifierStandard;
+    }
+
+    public Boolean getBusinessCustomerWithoutVatNumber() {
+      return businessCustomerWithoutVatNumber;
+    }
+
+    public Boolean getRegisteredForGst() {
+      return registeredForGst;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.vatNumber != null) {
+
+        formData.put("vat_number", this.vatNumber);
+      }
+
+      if (this.vatNumberPrefix != null) {
+
+        formData.put("vat_number_prefix", this.vatNumberPrefix);
+      }
+
+      if (this.entityIdentifierScheme != null) {
+
+        formData.put("entity_identifier_scheme", this.entityIdentifierScheme);
+      }
+
+      if (this.isEinvoiceEnabled != null) {
+
+        formData.put("is_einvoice_enabled", this.isEinvoiceEnabled);
+      }
+
+      if (this.einvoicingMethod != null) {
+
+        formData.put("einvoicing_method", this.einvoicingMethod);
+      }
+
+      if (this.entityIdentifierStandard != null) {
+
+        formData.put("entity_identifier_standard", this.entityIdentifierStandard);
+      }
+
+      if (this.businessCustomerWithoutVatNumber != null) {
+
+        formData.put("business_customer_without_vat_number", this.businessCustomerWithoutVatNumber);
+      }
+
+      if (this.registeredForGst != null) {
+
+        formData.put("registered_for_gst", this.registeredForGst);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CustomerParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CustomerBuilder builder() {
+      return new CustomerBuilder();
+    }
+
+    public static final class CustomerBuilder {
+
+      private String vatNumber;
+
+      private String vatNumberPrefix;
+
+      private String entityIdentifierScheme;
+
+      private Boolean isEinvoiceEnabled;
+
+      private EinvoicingMethod einvoicingMethod;
+
+      private String entityIdentifierStandard;
+
+      private Boolean businessCustomerWithoutVatNumber;
+
+      private Boolean registeredForGst;
+
+      private CustomerBuilder() {}
+
+      public CustomerBuilder vatNumber(String value) {
+        this.vatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder vatNumberPrefix(String value) {
+        this.vatNumberPrefix = value;
+        return this;
+      }
+
+      public CustomerBuilder entityIdentifierScheme(String value) {
+        this.entityIdentifierScheme = value;
+        return this;
+      }
+
+      public CustomerBuilder isEinvoiceEnabled(Boolean value) {
+        this.isEinvoiceEnabled = value;
+        return this;
+      }
+
+      public CustomerBuilder einvoicingMethod(EinvoicingMethod value) {
+        this.einvoicingMethod = value;
+        return this;
+      }
+
+      public CustomerBuilder entityIdentifierStandard(String value) {
+        this.entityIdentifierStandard = value;
+        return this;
+      }
+
+      public CustomerBuilder businessCustomerWithoutVatNumber(Boolean value) {
+        this.businessCustomerWithoutVatNumber = value;
+        return this;
+      }
+
+      public CustomerBuilder registeredForGst(Boolean value) {
+        this.registeredForGst = value;
+        return this;
+      }
+
+      public CustomerParams build() {
+        return new CustomerParams(this);
+      }
+    }
+
+    public enum EinvoicingMethod {
+      AUTOMATIC("automatic"),
+
+      MANUAL("manual"),
+
+      SITE_DEFAULT("site_default"),
+
+      /** An enum member indicating that EinvoicingMethod was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      EinvoicingMethod(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static EinvoicingMethod fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (EinvoicingMethod enumValue : EinvoicingMethod.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ContractTermParams {
+
+    private final ActionAtTermEnd actionAtTermEnd;
+
+    private final Integer cancellationCutoffPeriod;
+
+    private ContractTermParams(ContractTermBuilder builder) {
+
+      this.actionAtTermEnd = builder.actionAtTermEnd;
+
+      this.cancellationCutoffPeriod = builder.cancellationCutoffPeriod;
+    }
+
+    public ActionAtTermEnd getActionAtTermEnd() {
+      return actionAtTermEnd;
+    }
+
+    public Integer getCancellationCutoffPeriod() {
+      return cancellationCutoffPeriod;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.actionAtTermEnd != null) {
+
+        formData.put("action_at_term_end", this.actionAtTermEnd);
+      }
+
+      if (this.cancellationCutoffPeriod != null) {
+
+        formData.put("cancellation_cutoff_period", this.cancellationCutoffPeriod);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ContractTermParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ContractTermBuilder builder() {
+      return new ContractTermBuilder();
+    }
+
+    public static final class ContractTermBuilder {
+
+      private ActionAtTermEnd actionAtTermEnd;
+
+      private Integer cancellationCutoffPeriod;
+
+      private ContractTermBuilder() {}
+
+      public ContractTermBuilder actionAtTermEnd(ActionAtTermEnd value) {
+        this.actionAtTermEnd = value;
+        return this;
+      }
+
+      public ContractTermBuilder cancellationCutoffPeriod(Integer value) {
+        this.cancellationCutoffPeriod = value;
+        return this;
+      }
+
+      public ContractTermParams build() {
+        return new ContractTermParams(this);
+      }
+    }
+
+    public enum ActionAtTermEnd {
+      RENEW("renew"),
+
+      EVERGREEN("evergreen"),
+
+      CANCEL("cancel"),
+
+      RENEW_ONCE("renew_once"),
+
+      /** An enum member indicating that ActionAtTermEnd was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ActionAtTermEnd(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ActionAtTermEnd fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ActionAtTermEnd enumValue : ActionAtTermEnd.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final Integer billingCycles;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp trialEnd;
+
+    private final ProrationType prorationType;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.billingCycles = builder.billingCycles;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.trialEnd = builder.trialEnd;
+
+      this.prorationType = builder.prorationType;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public Integer getBillingCycles() {
+      return billingCycles;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getTrialEnd() {
+      return trialEnd;
+    }
+
+    public ProrationType getProrationType() {
+      return prorationType;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.billingCycles != null) {
+
+        formData.put("billing_cycles", this.billingCycles);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.trialEnd != null) {
+
+        formData.put("trial_end", this.trialEnd);
+      }
+
+      if (this.prorationType != null) {
+
+        formData.put("proration_type", this.prorationType);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private Integer billingCycles;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp trialEnd;
+
+      private ProrationType prorationType;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder billingCycles(Integer value) {
+        this.billingCycles = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder trialEnd(Timestamp value) {
+        this.trialEnd = value;
+        return this;
+      }
+
+      public AddonsBuilder prorationType(ProrationType value) {
+        this.prorationType = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+
+    public enum ProrationType {
+      FULL_TERM("full_term"),
+
+      PARTIAL_TERM("partial_term"),
+
+      NONE("none"),
+
+      /** An enum member indicating that ProrationType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ProrationType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ProrationType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ProrationType enumValue : ProrationType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class EventBasedAddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final Integer servicePeriodInDays;
+
+    private final ChargeOn chargeOn;
+
+    private final OnEvent onEvent;
+
+    private final Boolean chargeOnce;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private EventBasedAddonsParams(EventBasedAddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.servicePeriodInDays = builder.servicePeriodInDays;
+
+      this.chargeOn = builder.chargeOn;
+
+      this.onEvent = builder.onEvent;
+
+      this.chargeOnce = builder.chargeOnce;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public Integer getServicePeriodInDays() {
+      return servicePeriodInDays;
+    }
+
+    public ChargeOn getChargeOn() {
+      return chargeOn;
+    }
+
+    public OnEvent getOnEvent() {
+      return onEvent;
+    }
+
+    public Boolean getChargeOnce() {
+      return chargeOnce;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.servicePeriodInDays != null) {
+
+        formData.put("service_period_in_days", this.servicePeriodInDays);
+      }
+
+      if (this.chargeOn != null) {
+
+        formData.put("charge_on", this.chargeOn);
+      }
+
+      if (this.onEvent != null) {
+
+        formData.put("on_event", this.onEvent);
+      }
+
+      if (this.chargeOnce != null) {
+
+        formData.put("charge_once", this.chargeOnce);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventBasedAddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventBasedAddonsBuilder builder() {
+      return new EventBasedAddonsBuilder();
+    }
+
+    public static final class EventBasedAddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private Integer servicePeriodInDays;
+
+      private ChargeOn chargeOn;
+
+      private OnEvent onEvent;
+
+      private Boolean chargeOnce;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private EventBasedAddonsBuilder() {}
+
+      public EventBasedAddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder servicePeriodInDays(Integer value) {
+        this.servicePeriodInDays = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOn(ChargeOn value) {
+        this.chargeOn = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder onEvent(OnEvent value) {
+        this.onEvent = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder chargeOnce(Boolean value) {
+        this.chargeOnce = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public EventBasedAddonsParams build() {
+        return new EventBasedAddonsParams(this);
+      }
+    }
+
+    public enum ChargeOn {
+      IMMEDIATELY("immediately"),
+
+      ON_EVENT("on_event"),
+
+      /** An enum member indicating that ChargeOn was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      ChargeOn(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static ChargeOn fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (ChargeOn enumValue : ChargeOn.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+
+    public enum OnEvent {
+      SUBSCRIPTION_CREATION("subscription_creation"),
+
+      SUBSCRIPTION_TRIAL_START("subscription_trial_start"),
+
+      PLAN_ACTIVATION("plan_activation"),
+
+      SUBSCRIPTION_ACTIVATION("subscription_activation"),
+
+      CONTRACT_TERMINATION("contract_termination"),
+
+      /** An enum member indicating that OnEvent was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      OnEvent(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static OnEvent fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (OnEvent enumValue : OnEvent.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class CouponsParams {
+
+    private final String couponId;
+
+    private final Timestamp applyTill;
+
+    private CouponsParams(CouponsBuilder builder) {
+
+      this.couponId = builder.couponId;
+
+      this.applyTill = builder.applyTill;
+    }
+
+    public String getCouponId() {
+      return couponId;
+    }
+
+    public Timestamp getApplyTill() {
+      return applyTill;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.couponId != null) {
+
+        formData.put("coupon_id", this.couponId);
+      }
+
+      if (this.applyTill != null) {
+
+        formData.put("apply_till", this.applyTill);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for CouponsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static CouponsBuilder builder() {
+      return new CouponsBuilder();
+    }
+
+    public static final class CouponsBuilder {
+
+      private String couponId;
+
+      private Timestamp applyTill;
+
+      private CouponsBuilder() {}
+
+      public CouponsBuilder couponId(String value) {
+        this.couponId = value;
+        return this;
+      }
+
+      public CouponsBuilder applyTill(Timestamp value) {
+        this.applyTill = value;
+        return this;
+      }
+
+      public CouponsParams build() {
+        return new CouponsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionsForCustomerParams.java b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionsForCustomerParams.java
new file mode 100644
index 00000000..dddb59aa
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/params/SubscriptionsForCustomerParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.subscription.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class SubscriptionsForCustomerParams {
+
+  private final Map<String, Object> queryParams;
+
+  private SubscriptionsForCustomerParams(SubscriptionsForCustomerBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public SubscriptionsForCustomerBuilder toBuilder() {
+    SubscriptionsForCustomerBuilder builder = new SubscriptionsForCustomerBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for SubscriptionsForCustomerParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionsForCustomerBuilder builder() {
+    return new SubscriptionsForCustomerBuilder();
+  }
+
+  public static final class SubscriptionsForCustomerBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private SubscriptionsForCustomerBuilder() {}
+
+    public SubscriptionsForCustomerBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public SubscriptionsForCustomerBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public SubscriptionsForCustomerParams build() {
+      return new SubscriptionsForCustomerParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/responses/ContractTermsForSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/ContractTermsForSubscriptionResponse.java
new file mode 100644
index 00000000..9c9a5c87
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/ContractTermsForSubscriptionResponse.java
@@ -0,0 +1,180 @@
+package com.chargebee.v4.models.subscription.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.contractTerm.ContractTerm;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.SubscriptionService;
+import com.chargebee.v4.models.subscription.params.ContractTermsForSubscriptionParams;
+
+/**
+ * Immutable response object for ContractTermsForSubscription operation. Contains paginated list
+ * data.
+ */
+public final class ContractTermsForSubscriptionResponse {
+
+  private final List<SubscriptionContractTermsForSubscriptionItem> list;
+
+  private final String nextOffset;
+
+  private final String subscriptionId;
+
+  private final SubscriptionService service;
+  private final ContractTermsForSubscriptionParams originalParams;
+  private final Response httpResponse;
+
+  private ContractTermsForSubscriptionResponse(
+      List<SubscriptionContractTermsForSubscriptionItem> list,
+      String nextOffset,
+      String subscriptionId,
+      SubscriptionService service,
+      ContractTermsForSubscriptionParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.subscriptionId = subscriptionId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into ContractTermsForSubscriptionResponse object (no service context). Use
+   * this when you only need to read a single page (no nextPage()).
+   */
+  public static ContractTermsForSubscriptionResponse fromJson(String json) {
+    try {
+
+      List<SubscriptionContractTermsForSubscriptionItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(SubscriptionContractTermsForSubscriptionItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new ContractTermsForSubscriptionResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse ContractTermsForSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into ContractTermsForSubscriptionResponse object with service context for
+   * pagination (enables nextPage()).
+   */
+  public static ContractTermsForSubscriptionResponse fromJson(
+      String json,
+      SubscriptionService service,
+      ContractTermsForSubscriptionParams originalParams,
+      String subscriptionId,
+      Response httpResponse) {
+    try {
+
+      List<SubscriptionContractTermsForSubscriptionItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(SubscriptionContractTermsForSubscriptionItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new ContractTermsForSubscriptionResponse(
+          list, nextOffset, subscriptionId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse ContractTermsForSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<SubscriptionContractTermsForSubscriptionItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public ContractTermsForSubscriptionResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    ContractTermsForSubscriptionParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : ContractTermsForSubscriptionParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.contractTermsForSubscription(subscriptionId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class SubscriptionContractTermsForSubscriptionItem {
+
+    private ContractTerm contractTerm;
+
+    public ContractTerm getContractTerm() {
+      return contractTerm;
+    }
+
+    public static SubscriptionContractTermsForSubscriptionItem fromJson(String json) {
+      SubscriptionContractTermsForSubscriptionItem item =
+          new SubscriptionContractTermsForSubscriptionItem();
+
+      String __contractTermJson = JsonUtil.getObject(json, "contract_term");
+      if (__contractTermJson != null) {
+        item.contractTerm = ContractTerm.fromJson(__contractTermJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/responses/ImportSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/ImportSubscriptionResponse.java
new file mode 100644
index 00000000..d26a89dd
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/ImportSubscriptionResponse.java
@@ -0,0 +1,146 @@
+package com.chargebee.v4.models.subscription.responses;
+
+import com.chargebee.v4.models.invoice.Invoice;
+
+import com.chargebee.v4.models.customer.Customer;
+
+import com.chargebee.v4.models.subscription.Subscription;
+
+import com.chargebee.v4.models.card.Card;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ImportSubscription operation. Contains the response data from the
+ * API.
+ */
+public final class ImportSubscriptionResponse extends BaseResponse {
+  private final Subscription subscription;
+
+  private final Customer customer;
+
+  private final Card card;
+
+  private final Invoice invoice;
+
+  private ImportSubscriptionResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.subscription = builder.subscription;
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+
+    this.invoice = builder.invoice;
+  }
+
+  /** Parse JSON response into ImportSubscriptionResponse object. */
+  public static ImportSubscriptionResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ImportSubscriptionResponse object with HTTP response. */
+  public static ImportSubscriptionResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __subscriptionJson = JsonUtil.getObject(json, "subscription");
+      if (__subscriptionJson != null) {
+        builder.subscription(Subscription.fromJson(__subscriptionJson));
+      }
+
+      String __customerJson = JsonUtil.getObject(json, "customer");
+      if (__customerJson != null) {
+        builder.customer(Customer.fromJson(__customerJson));
+      }
+
+      String __cardJson = JsonUtil.getObject(json, "card");
+      if (__cardJson != null) {
+        builder.card(Card.fromJson(__cardJson));
+      }
+
+      String __invoiceJson = JsonUtil.getObject(json, "invoice");
+      if (__invoiceJson != null) {
+        builder.invoice(Invoice.fromJson(__invoiceJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ImportSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ImportSubscriptionResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ImportSubscriptionResponse. */
+  public static class Builder {
+
+    private Subscription subscription;
+
+    private Customer customer;
+
+    private Card card;
+
+    private Invoice invoice;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder subscription(Subscription subscription) {
+      this.subscription = subscription;
+      return this;
+    }
+
+    public Builder customer(Customer customer) {
+      this.customer = customer;
+      return this;
+    }
+
+    public Builder card(Card card) {
+      this.card = card;
+      return this;
+    }
+
+    public Builder invoice(Invoice invoice) {
+      this.invoice = invoice;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ImportSubscriptionResponse build() {
+      return new ImportSubscriptionResponse(this);
+    }
+  }
+
+  /** Get the subscription from the response. */
+  public Subscription getSubscription() {
+    return subscription;
+  }
+
+  /** Get the customer from the response. */
+  public Customer getCustomer() {
+    return customer;
+  }
+
+  /** Get the card from the response. */
+  public Card getCard() {
+    return card;
+  }
+
+  /** Get the invoice from the response. */
+  public Invoice getInvoice() {
+    return invoice;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionAddChargeAtTermEndResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionAddChargeAtTermEndResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionAddChargeAtTermEndResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionAddChargeAtTermEndResponse.java
index 91bd06df..4fc17658 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionAddChargeAtTermEndResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionAddChargeAtTermEndResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCancelForItemsResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCancelForItemsResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCancelForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCancelForItemsResponse.java
index cf167ae9..3ea020da 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCancelForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCancelForItemsResponse.java
@@ -1,20 +1,20 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCancelResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCancelResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCancelResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCancelResponse.java
index 4ac9cf2b..b63fa89a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCancelResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCancelResponse.java
@@ -1,20 +1,20 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionChangeTermEndResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionChangeTermEndResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionChangeTermEndResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionChangeTermEndResponse.java
index acc31c18..8d7efbf6 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionChangeTermEndResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionChangeTermEndResponse.java
@@ -1,20 +1,20 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionChargeAddonAtTermEndResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionChargeAddonAtTermEndResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionChargeAddonAtTermEndResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionChargeAddonAtTermEndResponse.java
index efe1a257..d690bf35 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionChargeAddonAtTermEndResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionChargeAddonAtTermEndResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionChargeFutureRenewalsResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionChargeFutureRenewalsResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionChargeFutureRenewalsResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionChargeFutureRenewalsResponse.java
index 81fe8eca..8859c8e7 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionChargeFutureRenewalsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionChargeFutureRenewalsResponse.java
@@ -1,18 +1,18 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCreateForCustomerResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCreateForCustomerResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCreateForCustomerResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCreateForCustomerResponse.java
index 119d2361..d71ad773 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCreateForCustomerResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCreateForCustomerResponse.java
@@ -1,18 +1,18 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCreateResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCreateResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCreateResponse.java
index 12335280..337b8b9a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCreateResponse.java
@@ -1,18 +1,18 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCreateWithItemsResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCreateWithItemsResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCreateWithItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCreateWithItemsResponse.java
index efff576e..68514e08 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionCreateWithItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionCreateWithItemsResponse.java
@@ -1,18 +1,18 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionDeleteResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionDeleteResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionDeleteResponse.java
index 7aac9d32..180a2fc3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionDeleteResponse.java
@@ -1,12 +1,12 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionEditAdvanceInvoiceScheduleResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionEditAdvanceInvoiceScheduleResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionEditAdvanceInvoiceScheduleResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionEditAdvanceInvoiceScheduleResponse.java
index 6288d6bb..6790cc41 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionEditAdvanceInvoiceScheduleResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionEditAdvanceInvoiceScheduleResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportContractTermResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionImportContractTermResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportContractTermResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionImportContractTermResponse.java
index 7cea2027..aa0a33ff 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportContractTermResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionImportContractTermResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
-import com.chargebee.v4.core.models.contractTerm.ContractTerm;
+import com.chargebee.v4.models.contractTerm.ContractTerm;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportForCustomerResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionImportForCustomerResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportForCustomerResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionImportForCustomerResponse.java
index ba9165b6..525b2eb8 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportForCustomerResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionImportForCustomerResponse.java
@@ -1,14 +1,14 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportForItemsResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionImportForItemsResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionImportForItemsResponse.java
index 91a013c2..88874408 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionImportForItemsResponse.java
@@ -1,14 +1,14 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportUnbilledChargesResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionImportUnbilledChargesResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportUnbilledChargesResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionImportUnbilledChargesResponse.java
index a52bf72f..4fb02239 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionImportUnbilledChargesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionImportUnbilledChargesResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionListDiscountsResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionListDiscountsResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionListDiscountsResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionListDiscountsResponse.java
index a9e48f2c..964d691b 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionListDiscountsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionListDiscountsResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.discount.Discount;
+import com.chargebee.v4.models.discount.Discount;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.SubscriptionService;
-import com.chargebee.v4.core.models.subscription.params.SubscriptionListDiscountsParams;
+import com.chargebee.v4.services.SubscriptionService;
+import com.chargebee.v4.models.subscription.params.SubscriptionListDiscountsParams;
 
 /**
  * Immutable response object for SubscriptionListDiscounts operation. Contains paginated list data.
@@ -107,9 +108,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public SubscriptionListDiscountsResponse nextPage() throws Exception {
+  public SubscriptionListDiscountsResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionListResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionListResponse.java
similarity index 90%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionListResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionListResponse.java
index 8e94111f..acd5e968 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionListResponse.java
@@ -1,17 +1,18 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.SubscriptionService;
-import com.chargebee.v4.core.models.subscription.params.SubscriptionListParams;
+import com.chargebee.v4.services.SubscriptionService;
+import com.chargebee.v4.models.subscription.params.SubscriptionListParams;
 
 /** Immutable response object for SubscriptionList operation. Contains paginated list data. */
 public final class SubscriptionListResponse {
@@ -102,9 +103,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public SubscriptionListResponse nextPage() throws Exception {
+  public SubscriptionListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionMoveResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionMoveResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionMoveResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionMoveResponse.java
index 3550f39e..c9eccee0 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionMoveResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionMoveResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionOverrideBillingProfileResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionOverrideBillingProfileResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionOverrideBillingProfileResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionOverrideBillingProfileResponse.java
index 87532191..09b7ed93 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionOverrideBillingProfileResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionOverrideBillingProfileResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
-import com.chargebee.v4.core.models.paymentSource.PaymentSource;
+import com.chargebee.v4.models.paymentSource.PaymentSource;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionPauseResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionPauseResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionPauseResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionPauseResponse.java
index 3bb5de2e..f60bc792 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionPauseResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionPauseResponse.java
@@ -1,20 +1,20 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionReactivateResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionReactivateResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionReactivateResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionReactivateResponse.java
index ccc43298..c036573b 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionReactivateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionReactivateResponse.java
@@ -1,18 +1,18 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRegenerateInvoiceResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRegenerateInvoiceResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRegenerateInvoiceResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRegenerateInvoiceResponse.java
index 9cce3e0b..0394c59e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRegenerateInvoiceResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRegenerateInvoiceResponse.java
@@ -1,12 +1,12 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveAdvanceInvoiceScheduleResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveAdvanceInvoiceScheduleResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveAdvanceInvoiceScheduleResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveAdvanceInvoiceScheduleResponse.java
index c5f9ccff..f13dbdae 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveAdvanceInvoiceScheduleResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveAdvanceInvoiceScheduleResponse.java
@@ -1,12 +1,12 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveCouponsResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveCouponsResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveCouponsResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveCouponsResponse.java
index d4501c78..bb694d5c 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveCouponsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveCouponsResponse.java
@@ -1,12 +1,12 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveScheduledCancellationResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveScheduledCancellationResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveScheduledCancellationResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveScheduledCancellationResponse.java
index 7f390cbd..1d806b52 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveScheduledCancellationResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveScheduledCancellationResponse.java
@@ -1,12 +1,12 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveScheduledChangesResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveScheduledChangesResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveScheduledChangesResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveScheduledChangesResponse.java
index 4f45e70b..ad5a4b91 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveScheduledChangesResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveScheduledChangesResponse.java
@@ -1,16 +1,16 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveScheduledPauseResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveScheduledPauseResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveScheduledPauseResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveScheduledPauseResponse.java
index bdd37ae6..5f262bd3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveScheduledPauseResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveScheduledPauseResponse.java
@@ -1,12 +1,12 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveScheduledResumptionResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveScheduledResumptionResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveScheduledResumptionResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveScheduledResumptionResponse.java
index 22cea01a..2140194c 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionRemoveScheduledResumptionResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRemoveScheduledResumptionResponse.java
@@ -1,12 +1,12 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionResumeResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionResumeResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionResumeResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionResumeResponse.java
index aae24d56..510efb76 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionResumeResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionResumeResponse.java
@@ -1,18 +1,18 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRetrieveAdvanceInvoiceScheduleResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRetrieveAdvanceInvoiceScheduleResponse.java
new file mode 100644
index 00000000..ba3dae96
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRetrieveAdvanceInvoiceScheduleResponse.java
@@ -0,0 +1,86 @@
+package com.chargebee.v4.models.subscription.responses;
+
+import com.chargebee.v4.models.advanceInvoiceSchedule.AdvanceInvoiceSchedule;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import java.util.List;
+
+/**
+ * Immutable response object for SubscriptionRetrieveAdvanceInvoiceSchedule operation. Contains the
+ * response data from a single resource get operation.
+ */
+public final class SubscriptionRetrieveAdvanceInvoiceScheduleResponse extends BaseResponse {
+  private final List<AdvanceInvoiceSchedule> advanceInvoiceSchedules;
+
+  private SubscriptionRetrieveAdvanceInvoiceScheduleResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.advanceInvoiceSchedules = builder.advanceInvoiceSchedules;
+  }
+
+  /** Parse JSON response into SubscriptionRetrieveAdvanceInvoiceScheduleResponse object. */
+  public static SubscriptionRetrieveAdvanceInvoiceScheduleResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into SubscriptionRetrieveAdvanceInvoiceScheduleResponse object with HTTP
+   * response.
+   */
+  public static SubscriptionRetrieveAdvanceInvoiceScheduleResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __advanceInvoiceSchedulesJson = JsonUtil.getArray(json, "advance_invoice_schedules");
+      if (__advanceInvoiceSchedulesJson != null) {
+        builder.advanceInvoiceSchedules(
+            JsonUtil.parseObjectArray(__advanceInvoiceSchedulesJson).stream()
+                .map(AdvanceInvoiceSchedule::fromJson)
+                .collect(java.util.stream.Collectors.toList()));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse SubscriptionRetrieveAdvanceInvoiceScheduleResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for SubscriptionRetrieveAdvanceInvoiceScheduleResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for SubscriptionRetrieveAdvanceInvoiceScheduleResponse. */
+  public static class Builder {
+
+    private List<AdvanceInvoiceSchedule> advanceInvoiceSchedules;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder advanceInvoiceSchedules(List<AdvanceInvoiceSchedule> advanceInvoiceSchedules) {
+      this.advanceInvoiceSchedules = advanceInvoiceSchedules;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public SubscriptionRetrieveAdvanceInvoiceScheduleResponse build() {
+      return new SubscriptionRetrieveAdvanceInvoiceScheduleResponse(this);
+    }
+  }
+
+  /** Get the advanceInvoiceSchedules from the response. */
+  public List<AdvanceInvoiceSchedule> getAdvanceInvoiceSchedules() {
+    return advanceInvoiceSchedules;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRetrieveResponse.java
new file mode 100644
index 00000000..44438e9c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRetrieveResponse.java
@@ -0,0 +1,123 @@
+package com.chargebee.v4.models.subscription.responses;
+
+import com.chargebee.v4.models.subscription.Subscription;
+
+import com.chargebee.v4.models.customer.Customer;
+
+import com.chargebee.v4.models.card.Card;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for SubscriptionRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class SubscriptionRetrieveResponse extends BaseResponse {
+  private final Subscription subscription;
+
+  private final Customer customer;
+
+  private final Card card;
+
+  private SubscriptionRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.subscription = builder.subscription;
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+  }
+
+  /** Parse JSON response into SubscriptionRetrieveResponse object. */
+  public static SubscriptionRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into SubscriptionRetrieveResponse object with HTTP response. */
+  public static SubscriptionRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __subscriptionJson = JsonUtil.getObject(json, "subscription");
+      if (__subscriptionJson != null) {
+        builder.subscription(Subscription.fromJson(__subscriptionJson));
+      }
+
+      String __customerJson = JsonUtil.getObject(json, "customer");
+      if (__customerJson != null) {
+        builder.customer(Customer.fromJson(__customerJson));
+      }
+
+      String __cardJson = JsonUtil.getObject(json, "card");
+      if (__cardJson != null) {
+        builder.card(Card.fromJson(__cardJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse SubscriptionRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for SubscriptionRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for SubscriptionRetrieveResponse. */
+  public static class Builder {
+
+    private Subscription subscription;
+
+    private Customer customer;
+
+    private Card card;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder subscription(Subscription subscription) {
+      this.subscription = subscription;
+      return this;
+    }
+
+    public Builder customer(Customer customer) {
+      this.customer = customer;
+      return this;
+    }
+
+    public Builder card(Card card) {
+      this.card = card;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public SubscriptionRetrieveResponse build() {
+      return new SubscriptionRetrieveResponse(this);
+    }
+  }
+
+  /** Get the subscription from the response. */
+  public Subscription getSubscription() {
+    return subscription;
+  }
+
+  /** Get the customer from the response. */
+  public Customer getCustomer() {
+    return customer;
+  }
+
+  /** Get the card from the response. */
+  public Card getCard() {
+    return card;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRetrieveWithScheduledChangesResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRetrieveWithScheduledChangesResponse.java
new file mode 100644
index 00000000..cd14db3e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionRetrieveWithScheduledChangesResponse.java
@@ -0,0 +1,128 @@
+package com.chargebee.v4.models.subscription.responses;
+
+import com.chargebee.v4.models.subscription.Subscription;
+
+import com.chargebee.v4.models.customer.Customer;
+
+import com.chargebee.v4.models.card.Card;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for SubscriptionRetrieveWithScheduledChanges operation. Contains the
+ * response data from a single resource get operation.
+ */
+public final class SubscriptionRetrieveWithScheduledChangesResponse extends BaseResponse {
+  private final Subscription subscription;
+
+  private final Customer customer;
+
+  private final Card card;
+
+  private SubscriptionRetrieveWithScheduledChangesResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.subscription = builder.subscription;
+
+    this.customer = builder.customer;
+
+    this.card = builder.card;
+  }
+
+  /** Parse JSON response into SubscriptionRetrieveWithScheduledChangesResponse object. */
+  public static SubscriptionRetrieveWithScheduledChangesResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into SubscriptionRetrieveWithScheduledChangesResponse object with HTTP
+   * response.
+   */
+  public static SubscriptionRetrieveWithScheduledChangesResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __subscriptionJson = JsonUtil.getObject(json, "subscription");
+      if (__subscriptionJson != null) {
+        builder.subscription(Subscription.fromJson(__subscriptionJson));
+      }
+
+      String __customerJson = JsonUtil.getObject(json, "customer");
+      if (__customerJson != null) {
+        builder.customer(Customer.fromJson(__customerJson));
+      }
+
+      String __cardJson = JsonUtil.getObject(json, "card");
+      if (__cardJson != null) {
+        builder.card(Card.fromJson(__cardJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse SubscriptionRetrieveWithScheduledChangesResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for SubscriptionRetrieveWithScheduledChangesResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for SubscriptionRetrieveWithScheduledChangesResponse. */
+  public static class Builder {
+
+    private Subscription subscription;
+
+    private Customer customer;
+
+    private Card card;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder subscription(Subscription subscription) {
+      this.subscription = subscription;
+      return this;
+    }
+
+    public Builder customer(Customer customer) {
+      this.customer = customer;
+      return this;
+    }
+
+    public Builder card(Card card) {
+      this.card = card;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public SubscriptionRetrieveWithScheduledChangesResponse build() {
+      return new SubscriptionRetrieveWithScheduledChangesResponse(this);
+    }
+  }
+
+  /** Get the subscription from the response. */
+  public Subscription getSubscription() {
+    return subscription;
+  }
+
+  /** Get the customer from the response. */
+  public Customer getCustomer() {
+    return customer;
+  }
+
+  /** Get the card from the response. */
+  public Card getCard() {
+    return card;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionUpdateForItemsResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionUpdateForItemsResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionUpdateForItemsResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionUpdateForItemsResponse.java
index e2a2c6c4..97a8b849 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionUpdateForItemsResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionUpdateForItemsResponse.java
@@ -1,20 +1,20 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionUpdateResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionUpdateResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionUpdateResponse.java
index 5ac2191a..94f9a775 100644
--- a/src/main/java/com/chargebee/v4/core/responses/subscription/SubscriptionUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionUpdateResponse.java
@@ -1,20 +1,20 @@
-package com.chargebee.v4.core.responses.subscription;
+package com.chargebee.v4.models.subscription.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.invoice.Invoice;
+import com.chargebee.v4.models.invoice.Invoice;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.creditNote.CreditNote;
+import com.chargebee.v4.models.creditNote.CreditNote;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.models.subscription.Subscription;
+import com.chargebee.v4.models.subscription.Subscription;
 
-import com.chargebee.v4.core.models.card.Card;
+import com.chargebee.v4.models.card.Card;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionsForCustomerResponse.java b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionsForCustomerResponse.java
new file mode 100644
index 00000000..6c0d27c1
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionsForCustomerResponse.java
@@ -0,0 +1,177 @@
+package com.chargebee.v4.models.subscription.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.subscription.Subscription;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.SubscriptionService;
+import com.chargebee.v4.models.subscription.params.SubscriptionsForCustomerParams;
+
+/**
+ * Immutable response object for SubscriptionsForCustomer operation. Contains paginated list data.
+ */
+public final class SubscriptionsForCustomerResponse {
+
+  private final List<SubscriptionSubscriptionsForCustomerItem> list;
+
+  private final String nextOffset;
+
+  private final String customerId;
+
+  private final SubscriptionService service;
+  private final SubscriptionsForCustomerParams originalParams;
+  private final Response httpResponse;
+
+  private SubscriptionsForCustomerResponse(
+      List<SubscriptionSubscriptionsForCustomerItem> list,
+      String nextOffset,
+      String customerId,
+      SubscriptionService service,
+      SubscriptionsForCustomerParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.customerId = customerId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into SubscriptionsForCustomerResponse object (no service context). Use this
+   * when you only need to read a single page (no nextPage()).
+   */
+  public static SubscriptionsForCustomerResponse fromJson(String json) {
+    try {
+
+      List<SubscriptionSubscriptionsForCustomerItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(SubscriptionSubscriptionsForCustomerItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new SubscriptionsForCustomerResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse SubscriptionsForCustomerResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into SubscriptionsForCustomerResponse object with service context for
+   * pagination (enables nextPage()).
+   */
+  public static SubscriptionsForCustomerResponse fromJson(
+      String json,
+      SubscriptionService service,
+      SubscriptionsForCustomerParams originalParams,
+      String customerId,
+      Response httpResponse) {
+    try {
+
+      List<SubscriptionSubscriptionsForCustomerItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(SubscriptionSubscriptionsForCustomerItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new SubscriptionsForCustomerResponse(
+          list, nextOffset, customerId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse SubscriptionsForCustomerResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<SubscriptionSubscriptionsForCustomerItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public SubscriptionsForCustomerResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    SubscriptionsForCustomerParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : SubscriptionsForCustomerParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.subscriptionsForCustomer(customerId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class SubscriptionSubscriptionsForCustomerItem {
+
+    private Subscription subscription;
+
+    public Subscription getSubscription() {
+      return subscription;
+    }
+
+    public static SubscriptionSubscriptionsForCustomerItem fromJson(String json) {
+      SubscriptionSubscriptionsForCustomerItem item =
+          new SubscriptionSubscriptionsForCustomerItem();
+
+      String __subscriptionJson = JsonUtil.getObject(json, "subscription");
+      if (__subscriptionJson != null) {
+        item.subscription = Subscription.fromJson(__subscriptionJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlement/SubscriptionEntitlement.java b/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/SubscriptionEntitlement.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionEntitlement/SubscriptionEntitlement.java
rename to src/main/java/com/chargebee/v4/models/subscriptionEntitlement/SubscriptionEntitlement.java
index 68e2e88f..1b166d5a 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlement/SubscriptionEntitlement.java
+++ b/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/SubscriptionEntitlement.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionEntitlement;
+package com.chargebee.v4.models.subscriptionEntitlement;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/params/SetSubscriptionEntitlementAvailabilityParams.java b/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/params/SetSubscriptionEntitlementAvailabilityParams.java
new file mode 100644
index 00000000..fbc2bb82
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/params/SetSubscriptionEntitlementAvailabilityParams.java
@@ -0,0 +1,141 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.subscriptionEntitlement.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class SetSubscriptionEntitlementAvailabilityParams {
+
+  private final Boolean isEnabled;
+
+  private final List<SubscriptionEntitlementsParams> subscriptionEntitlements;
+
+  private SetSubscriptionEntitlementAvailabilityParams(
+      SetSubscriptionEntitlementAvailabilityBuilder builder) {
+
+    this.isEnabled = builder.isEnabled;
+
+    this.subscriptionEntitlements = builder.subscriptionEntitlements;
+  }
+
+  public Boolean getIsEnabled() {
+    return isEnabled;
+  }
+
+  public List<SubscriptionEntitlementsParams> getSubscriptionEntitlements() {
+    return subscriptionEntitlements;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.isEnabled != null) {
+
+      formData.put("is_enabled", this.isEnabled);
+    }
+
+    if (this.subscriptionEntitlements != null) {
+
+      // List of objects
+      for (int i = 0; i < this.subscriptionEntitlements.size(); i++) {
+        SubscriptionEntitlementsParams item = this.subscriptionEntitlements.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "subscription_entitlements[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for SetSubscriptionEntitlementAvailabilityParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SetSubscriptionEntitlementAvailabilityBuilder builder() {
+    return new SetSubscriptionEntitlementAvailabilityBuilder();
+  }
+
+  public static final class SetSubscriptionEntitlementAvailabilityBuilder {
+
+    private Boolean isEnabled;
+
+    private List<SubscriptionEntitlementsParams> subscriptionEntitlements;
+
+    private SetSubscriptionEntitlementAvailabilityBuilder() {}
+
+    public SetSubscriptionEntitlementAvailabilityBuilder isEnabled(Boolean value) {
+      this.isEnabled = value;
+      return this;
+    }
+
+    public SetSubscriptionEntitlementAvailabilityBuilder subscriptionEntitlements(
+        List<SubscriptionEntitlementsParams> value) {
+      this.subscriptionEntitlements = value;
+      return this;
+    }
+
+    public SetSubscriptionEntitlementAvailabilityParams build() {
+      return new SetSubscriptionEntitlementAvailabilityParams(this);
+    }
+  }
+
+  public static final class SubscriptionEntitlementsParams {
+
+    private final String featureId;
+
+    private SubscriptionEntitlementsParams(SubscriptionEntitlementsBuilder builder) {
+
+      this.featureId = builder.featureId;
+    }
+
+    public String getFeatureId() {
+      return featureId;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.featureId != null) {
+
+        formData.put("feature_id", this.featureId);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for SubscriptionEntitlementsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static SubscriptionEntitlementsBuilder builder() {
+      return new SubscriptionEntitlementsBuilder();
+    }
+
+    public static final class SubscriptionEntitlementsBuilder {
+
+      private String featureId;
+
+      private SubscriptionEntitlementsBuilder() {}
+
+      public SubscriptionEntitlementsBuilder featureId(String value) {
+        this.featureId = value;
+        return this;
+      }
+
+      public SubscriptionEntitlementsParams build() {
+        return new SubscriptionEntitlementsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/params/SubscriptionEntitlementsForSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/params/SubscriptionEntitlementsForSubscriptionParams.java
new file mode 100644
index 00000000..12940405
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/params/SubscriptionEntitlementsForSubscriptionParams.java
@@ -0,0 +1,80 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.subscriptionEntitlement.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class SubscriptionEntitlementsForSubscriptionParams {
+
+  private final Map<String, Object> queryParams;
+
+  private SubscriptionEntitlementsForSubscriptionParams(
+      SubscriptionEntitlementsForSubscriptionBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public SubscriptionEntitlementsForSubscriptionBuilder toBuilder() {
+    SubscriptionEntitlementsForSubscriptionBuilder builder =
+        new SubscriptionEntitlementsForSubscriptionBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for SubscriptionEntitlementsForSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SubscriptionEntitlementsForSubscriptionBuilder builder() {
+    return new SubscriptionEntitlementsForSubscriptionBuilder();
+  }
+
+  public static final class SubscriptionEntitlementsForSubscriptionBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private SubscriptionEntitlementsForSubscriptionBuilder() {}
+
+    public SubscriptionEntitlementsForSubscriptionBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public SubscriptionEntitlementsForSubscriptionBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionEntitlementsForSubscriptionBuilder includeDrafts(Boolean value) {
+      queryParams.put("include_drafts", value);
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionEntitlementsForSubscriptionBuilder embed(String value) {
+      queryParams.put("embed", value);
+      return this;
+    }
+
+    @Deprecated
+    public SubscriptionEntitlementsForSubscriptionBuilder includeScheduledOverrides(Boolean value) {
+      queryParams.put("include_scheduled_overrides", value);
+      return this;
+    }
+
+    public SubscriptionEntitlementsForSubscriptionParams build() {
+      return new SubscriptionEntitlementsForSubscriptionParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/responses/SetSubscriptionEntitlementAvailabilityResponse.java b/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/responses/SetSubscriptionEntitlementAvailabilityResponse.java
new file mode 100644
index 00000000..31065b34
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/responses/SetSubscriptionEntitlementAvailabilityResponse.java
@@ -0,0 +1,84 @@
+package com.chargebee.v4.models.subscriptionEntitlement.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.subscriptionEntitlement.SubscriptionEntitlement;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for SetSubscriptionEntitlementAvailability operation. Contains the
+ * response data from the API.
+ */
+public final class SetSubscriptionEntitlementAvailabilityResponse extends BaseResponse {
+  private final List<SubscriptionEntitlement> list;
+
+  private SetSubscriptionEntitlementAvailabilityResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.list = builder.list;
+  }
+
+  /** Parse JSON response into SetSubscriptionEntitlementAvailabilityResponse object. */
+  public static SetSubscriptionEntitlementAvailabilityResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into SetSubscriptionEntitlementAvailabilityResponse object with HTTP
+   * response.
+   */
+  public static SetSubscriptionEntitlementAvailabilityResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.list(
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(SubscriptionEntitlement::fromJson)
+              .collect(java.util.stream.Collectors.toList()));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse SetSubscriptionEntitlementAvailabilityResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for SetSubscriptionEntitlementAvailabilityResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for SetSubscriptionEntitlementAvailabilityResponse. */
+  public static class Builder {
+
+    private List<SubscriptionEntitlement> list;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder list(List<SubscriptionEntitlement> list) {
+      this.list = list;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public SetSubscriptionEntitlementAvailabilityResponse build() {
+      return new SetSubscriptionEntitlementAvailabilityResponse(this);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<SubscriptionEntitlement> getList() {
+    return list;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/responses/SubscriptionEntitlementsForSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/responses/SubscriptionEntitlementsForSubscriptionResponse.java
new file mode 100644
index 00000000..5d783637
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscriptionEntitlement/responses/SubscriptionEntitlementsForSubscriptionResponse.java
@@ -0,0 +1,183 @@
+package com.chargebee.v4.models.subscriptionEntitlement.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.subscriptionEntitlement.SubscriptionEntitlement;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.SubscriptionEntitlementService;
+import com.chargebee.v4.models.subscriptionEntitlement.params.SubscriptionEntitlementsForSubscriptionParams;
+
+/**
+ * Immutable response object for SubscriptionEntitlementsForSubscription operation. Contains
+ * paginated list data.
+ */
+public final class SubscriptionEntitlementsForSubscriptionResponse {
+
+  private final List<SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem> list;
+
+  private final String nextOffset;
+
+  private final String subscriptionId;
+
+  private final SubscriptionEntitlementService service;
+  private final SubscriptionEntitlementsForSubscriptionParams originalParams;
+  private final Response httpResponse;
+
+  private SubscriptionEntitlementsForSubscriptionResponse(
+      List<SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem> list,
+      String nextOffset,
+      String subscriptionId,
+      SubscriptionEntitlementService service,
+      SubscriptionEntitlementsForSubscriptionParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.subscriptionId = subscriptionId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into SubscriptionEntitlementsForSubscriptionResponse object (no service
+   * context). Use this when you only need to read a single page (no nextPage()).
+   */
+  public static SubscriptionEntitlementsForSubscriptionResponse fromJson(String json) {
+    try {
+
+      List<SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new SubscriptionEntitlementsForSubscriptionResponse(
+          list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse SubscriptionEntitlementsForSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into SubscriptionEntitlementsForSubscriptionResponse object with service
+   * context for pagination (enables nextPage()).
+   */
+  public static SubscriptionEntitlementsForSubscriptionResponse fromJson(
+      String json,
+      SubscriptionEntitlementService service,
+      SubscriptionEntitlementsForSubscriptionParams originalParams,
+      String subscriptionId,
+      Response httpResponse) {
+    try {
+
+      List<SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new SubscriptionEntitlementsForSubscriptionResponse(
+          list, nextOffset, subscriptionId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse SubscriptionEntitlementsForSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public SubscriptionEntitlementsForSubscriptionResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    SubscriptionEntitlementsForSubscriptionParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : SubscriptionEntitlementsForSubscriptionParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.subscriptionEntitlementsForSubscription(subscriptionId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem {
+
+    private SubscriptionEntitlement subscriptionEntitlement;
+
+    public SubscriptionEntitlement getSubscriptionEntitlement() {
+      return subscriptionEntitlement;
+    }
+
+    public static SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem fromJson(
+        String json) {
+      SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem item =
+          new SubscriptionEntitlementSubscriptionEntitlementsForSubscriptionItem();
+
+      String __subscriptionEntitlementJson = JsonUtil.getObject(json, "subscription_entitlement");
+      if (__subscriptionEntitlementJson != null) {
+        item.subscriptionEntitlement =
+            SubscriptionEntitlement.fromJson(__subscriptionEntitlementJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlementsCreatedDetail/SubscriptionEntitlementsCreatedDetail.java b/src/main/java/com/chargebee/v4/models/subscriptionEntitlementsCreatedDetail/SubscriptionEntitlementsCreatedDetail.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionEntitlementsCreatedDetail/SubscriptionEntitlementsCreatedDetail.java
rename to src/main/java/com/chargebee/v4/models/subscriptionEntitlementsCreatedDetail/SubscriptionEntitlementsCreatedDetail.java
index 9f83595f..de85eeea 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlementsCreatedDetail/SubscriptionEntitlementsCreatedDetail.java
+++ b/src/main/java/com/chargebee/v4/models/subscriptionEntitlementsCreatedDetail/SubscriptionEntitlementsCreatedDetail.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionEntitlementsCreatedDetail;
+package com.chargebee.v4.models.subscriptionEntitlementsCreatedDetail;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlementsUpdatedDetail/SubscriptionEntitlementsUpdatedDetail.java b/src/main/java/com/chargebee/v4/models/subscriptionEntitlementsUpdatedDetail/SubscriptionEntitlementsUpdatedDetail.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionEntitlementsUpdatedDetail/SubscriptionEntitlementsUpdatedDetail.java
rename to src/main/java/com/chargebee/v4/models/subscriptionEntitlementsUpdatedDetail/SubscriptionEntitlementsUpdatedDetail.java
index c2e941b3..8eecaf11 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionEntitlementsUpdatedDetail/SubscriptionEntitlementsUpdatedDetail.java
+++ b/src/main/java/com/chargebee/v4/models/subscriptionEntitlementsUpdatedDetail/SubscriptionEntitlementsUpdatedDetail.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionEntitlementsUpdatedDetail;
+package com.chargebee.v4.models.subscriptionEntitlementsUpdatedDetail;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionEstimate/SubscriptionEstimate.java b/src/main/java/com/chargebee/v4/models/subscriptionEstimate/SubscriptionEstimate.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionEstimate/SubscriptionEstimate.java
rename to src/main/java/com/chargebee/v4/models/subscriptionEstimate/SubscriptionEstimate.java
index d4d096ac..b971d339 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionEstimate/SubscriptionEstimate.java
+++ b/src/main/java/com/chargebee/v4/models/subscriptionEstimate/SubscriptionEstimate.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionEstimate;
+package com.chargebee.v4.models.subscriptionEstimate;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/subscriptionSetting/params/SubscriptionSettingRetrieveParams.java b/src/main/java/com/chargebee/v4/models/subscriptionSetting/params/SubscriptionSettingRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/subscriptionSetting/params/SubscriptionSettingRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/subscriptionSetting/params/SubscriptionSettingRetrieveParams.java
index 0aabcb25..9ec1c10a 100644
--- a/src/main/java/com/chargebee/v4/core/models/subscriptionSetting/params/SubscriptionSettingRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/subscriptionSetting/params/SubscriptionSettingRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.subscriptionSetting.params;
+package com.chargebee.v4.models.subscriptionSetting.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/subscriptionSetting/responses/SubscriptionSettingRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/subscriptionSetting/responses/SubscriptionSettingRetrieveResponse.java
new file mode 100644
index 00000000..28a26ff8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/subscriptionSetting/responses/SubscriptionSettingRetrieveResponse.java
@@ -0,0 +1,73 @@
+package com.chargebee.v4.models.subscriptionSetting.responses;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for SubscriptionSettingRetrieve operation. Contains the response data
+ * from a single resource get operation.
+ */
+public final class SubscriptionSettingRetrieveResponse extends BaseResponse {
+  private final Object subscriptionSetting;
+
+  private SubscriptionSettingRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.subscriptionSetting = builder.subscriptionSetting;
+  }
+
+  /** Parse JSON response into SubscriptionSettingRetrieveResponse object. */
+  public static SubscriptionSettingRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into SubscriptionSettingRetrieveResponse object with HTTP response. */
+  public static SubscriptionSettingRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.subscriptionSetting(JsonUtil.getObject(json, "subscription_setting"));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse SubscriptionSettingRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for SubscriptionSettingRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for SubscriptionSettingRetrieveResponse. */
+  public static class Builder {
+
+    private Object subscriptionSetting;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder subscriptionSetting(Object subscriptionSetting) {
+      this.subscriptionSetting = subscriptionSetting;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public SubscriptionSettingRetrieveResponse build() {
+      return new SubscriptionSettingRetrieveResponse(this);
+    }
+  }
+
+  /** Get the subscriptionSetting from the response. */
+  public Object getSubscriptionSetting() {
+    return subscriptionSetting;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/taxWithheld/TaxWithheld.java b/src/main/java/com/chargebee/v4/models/taxWithheld/TaxWithheld.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/taxWithheld/TaxWithheld.java
rename to src/main/java/com/chargebee/v4/models/taxWithheld/TaxWithheld.java
index 78cf55af..408cb660 100644
--- a/src/main/java/com/chargebee/v4/core/models/taxWithheld/TaxWithheld.java
+++ b/src/main/java/com/chargebee/v4/models/taxWithheld/TaxWithheld.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.taxWithheld;
+package com.chargebee.v4.models.taxWithheld;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.math.BigDecimal;
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartyConfiguration/ThirdPartyConfiguration.java b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/ThirdPartyConfiguration.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/thirdPartyConfiguration/ThirdPartyConfiguration.java
rename to src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/ThirdPartyConfiguration.java
index 4f4c7ad2..55a5e443 100644
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartyConfiguration/ThirdPartyConfiguration.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/ThirdPartyConfiguration.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.thirdPartyConfiguration;
+package com.chargebee.v4.models.thirdPartyConfiguration;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartyConfiguration/params/ThirdPartyConfigurationConfigurationsParams.java b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/params/ThirdPartyConfigurationConfigurationsParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/thirdPartyConfiguration/params/ThirdPartyConfigurationConfigurationsParams.java
rename to src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/params/ThirdPartyConfigurationConfigurationsParams.java
index a88c8aba..d3f84344 100644
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartyConfiguration/params/ThirdPartyConfigurationConfigurationsParams.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/params/ThirdPartyConfigurationConfigurationsParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.thirdPartyConfiguration.params;
+package com.chargebee.v4.models.thirdPartyConfiguration.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartyConfiguration/params/ThirdPartyConfigurationRetrieveParams.java b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/params/ThirdPartyConfigurationRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/thirdPartyConfiguration/params/ThirdPartyConfigurationRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/params/ThirdPartyConfigurationRetrieveParams.java
index a46006b6..57f35768 100644
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartyConfiguration/params/ThirdPartyConfigurationRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/params/ThirdPartyConfigurationRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.thirdPartyConfiguration.params;
+package com.chargebee.v4.models.thirdPartyConfiguration.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/params/ThirdPartyConfigurationUpdateParams.java b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/params/ThirdPartyConfigurationUpdateParams.java
new file mode 100644
index 00000000..7ae998d8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/params/ThirdPartyConfigurationUpdateParams.java
@@ -0,0 +1,122 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.thirdPartyConfiguration.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class ThirdPartyConfigurationUpdateParams {
+
+  private final String integrationName;
+
+  private final java.util.Map<String, Object> configJson;
+
+  private final java.util.Map<String, Object> authJson;
+
+  private final Timestamp lastSyncAt;
+
+  private ThirdPartyConfigurationUpdateParams(ThirdPartyConfigurationUpdateBuilder builder) {
+
+    this.integrationName = builder.integrationName;
+
+    this.configJson = builder.configJson;
+
+    this.authJson = builder.authJson;
+
+    this.lastSyncAt = builder.lastSyncAt;
+  }
+
+  public String getIntegrationName() {
+    return integrationName;
+  }
+
+  public java.util.Map<String, Object> getConfigJson() {
+    return configJson;
+  }
+
+  public java.util.Map<String, Object> getAuthJson() {
+    return authJson;
+  }
+
+  public Timestamp getLastSyncAt() {
+    return lastSyncAt;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.integrationName != null) {
+
+      formData.put("integration_name", this.integrationName);
+    }
+
+    if (this.configJson != null) {
+
+      formData.put("config_json", JsonUtil.toJson(this.configJson));
+    }
+
+    if (this.authJson != null) {
+
+      formData.put("auth_json", JsonUtil.toJson(this.authJson));
+    }
+
+    if (this.lastSyncAt != null) {
+
+      formData.put("last_sync_at", this.lastSyncAt);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ThirdPartyConfigurationUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ThirdPartyConfigurationUpdateBuilder builder() {
+    return new ThirdPartyConfigurationUpdateBuilder();
+  }
+
+  public static final class ThirdPartyConfigurationUpdateBuilder {
+
+    private String integrationName;
+
+    private java.util.Map<String, Object> configJson;
+
+    private java.util.Map<String, Object> authJson;
+
+    private Timestamp lastSyncAt;
+
+    private ThirdPartyConfigurationUpdateBuilder() {}
+
+    public ThirdPartyConfigurationUpdateBuilder integrationName(String value) {
+      this.integrationName = value;
+      return this;
+    }
+
+    public ThirdPartyConfigurationUpdateBuilder configJson(java.util.Map<String, Object> value) {
+      this.configJson = value;
+      return this;
+    }
+
+    public ThirdPartyConfigurationUpdateBuilder authJson(java.util.Map<String, Object> value) {
+      this.authJson = value;
+      return this;
+    }
+
+    public ThirdPartyConfigurationUpdateBuilder lastSyncAt(Timestamp value) {
+      this.lastSyncAt = value;
+      return this;
+    }
+
+    public ThirdPartyConfigurationUpdateParams build() {
+      return new ThirdPartyConfigurationUpdateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/responses/ThirdPartyConfigurationConfigurationsResponse.java b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/responses/ThirdPartyConfigurationConfigurationsResponse.java
new file mode 100644
index 00000000..dbb53d71
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/responses/ThirdPartyConfigurationConfigurationsResponse.java
@@ -0,0 +1,83 @@
+package com.chargebee.v4.models.thirdPartyConfiguration.responses;
+
+import com.chargebee.v4.models.thirdPartyConfiguration.ThirdPartyConfiguration;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ThirdPartyConfigurationConfigurations operation. Contains the
+ * response data from a single resource get operation.
+ */
+public final class ThirdPartyConfigurationConfigurationsResponse extends BaseResponse {
+  private final ThirdPartyConfiguration thirdPartyConfiguration;
+
+  private ThirdPartyConfigurationConfigurationsResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.thirdPartyConfiguration = builder.thirdPartyConfiguration;
+  }
+
+  /** Parse JSON response into ThirdPartyConfigurationConfigurationsResponse object. */
+  public static ThirdPartyConfigurationConfigurationsResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into ThirdPartyConfigurationConfigurationsResponse object with HTTP
+   * response.
+   */
+  public static ThirdPartyConfigurationConfigurationsResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __thirdPartyConfigurationJson = JsonUtil.getObject(json, "third_party_configuration");
+      if (__thirdPartyConfigurationJson != null) {
+        builder.thirdPartyConfiguration(
+            ThirdPartyConfiguration.fromJson(__thirdPartyConfigurationJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse ThirdPartyConfigurationConfigurationsResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ThirdPartyConfigurationConfigurationsResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ThirdPartyConfigurationConfigurationsResponse. */
+  public static class Builder {
+
+    private ThirdPartyConfiguration thirdPartyConfiguration;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder thirdPartyConfiguration(ThirdPartyConfiguration thirdPartyConfiguration) {
+      this.thirdPartyConfiguration = thirdPartyConfiguration;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ThirdPartyConfigurationConfigurationsResponse build() {
+      return new ThirdPartyConfigurationConfigurationsResponse(this);
+    }
+  }
+
+  /** Get the thirdPartyConfiguration from the response. */
+  public ThirdPartyConfiguration getThirdPartyConfiguration() {
+    return thirdPartyConfiguration;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/responses/ThirdPartyConfigurationRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/responses/ThirdPartyConfigurationRetrieveResponse.java
new file mode 100644
index 00000000..77390791
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/responses/ThirdPartyConfigurationRetrieveResponse.java
@@ -0,0 +1,80 @@
+package com.chargebee.v4.models.thirdPartyConfiguration.responses;
+
+import com.chargebee.v4.models.thirdPartyConfiguration.ThirdPartyConfiguration;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ThirdPartyConfigurationRetrieve operation. Contains the response
+ * data from a single resource get operation.
+ */
+public final class ThirdPartyConfigurationRetrieveResponse extends BaseResponse {
+  private final ThirdPartyConfiguration thirdPartyConfiguration;
+
+  private ThirdPartyConfigurationRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.thirdPartyConfiguration = builder.thirdPartyConfiguration;
+  }
+
+  /** Parse JSON response into ThirdPartyConfigurationRetrieveResponse object. */
+  public static ThirdPartyConfigurationRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ThirdPartyConfigurationRetrieveResponse object with HTTP response. */
+  public static ThirdPartyConfigurationRetrieveResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __thirdPartyConfigurationJson = JsonUtil.getObject(json, "third_party_configuration");
+      if (__thirdPartyConfigurationJson != null) {
+        builder.thirdPartyConfiguration(
+            ThirdPartyConfiguration.fromJson(__thirdPartyConfigurationJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse ThirdPartyConfigurationRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ThirdPartyConfigurationRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ThirdPartyConfigurationRetrieveResponse. */
+  public static class Builder {
+
+    private ThirdPartyConfiguration thirdPartyConfiguration;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder thirdPartyConfiguration(ThirdPartyConfiguration thirdPartyConfiguration) {
+      this.thirdPartyConfiguration = thirdPartyConfiguration;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ThirdPartyConfigurationRetrieveResponse build() {
+      return new ThirdPartyConfigurationRetrieveResponse(this);
+    }
+  }
+
+  /** Get the thirdPartyConfiguration from the response. */
+  public ThirdPartyConfiguration getThirdPartyConfiguration() {
+    return thirdPartyConfiguration;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/thirdPartyConfiguration/ThirdPartyConfigurationUpdateResponse.java b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/responses/ThirdPartyConfigurationUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/thirdPartyConfiguration/ThirdPartyConfigurationUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/responses/ThirdPartyConfigurationUpdateResponse.java
index 9c9f9a54..a40a3c40 100644
--- a/src/main/java/com/chargebee/v4/core/responses/thirdPartyConfiguration/ThirdPartyConfigurationUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyConfiguration/responses/ThirdPartyConfigurationUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.thirdPartyConfiguration;
+package com.chargebee.v4.models.thirdPartyConfiguration.responses;
 
-import com.chargebee.v4.core.models.thirdPartyConfiguration.ThirdPartyConfiguration;
+import com.chargebee.v4.models.thirdPartyConfiguration.ThirdPartyConfiguration;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/ThirdPartyEntityMapping.java b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/ThirdPartyEntityMapping.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/ThirdPartyEntityMapping.java
rename to src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/ThirdPartyEntityMapping.java
index 29ecc827..114d6081 100644
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/ThirdPartyEntityMapping.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/ThirdPartyEntityMapping.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.thirdPartyEntityMapping;
+package com.chargebee.v4.models.thirdPartyEntityMapping;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingListAllParams.java b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingListAllParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingListAllParams.java
rename to src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingListAllParams.java
index ffc6b1b1..8b96cde8 100644
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingListAllParams.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingListAllParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.thirdPartyEntityMapping.params;
+package com.chargebee.v4.models.thirdPartyEntityMapping.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingListParams.java b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingListParams.java
rename to src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingListParams.java
index 963197b0..61f252ef 100644
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingListParams.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.thirdPartyEntityMapping.params;
+package com.chargebee.v4.models.thirdPartyEntityMapping.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingRetrieveEntityParams.java b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingRetrieveEntityParams.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingRetrieveEntityParams.java
rename to src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingRetrieveEntityParams.java
index e0fba193..520a528b 100644
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingRetrieveEntityParams.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingRetrieveEntityParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.thirdPartyEntityMapping.params;
+package com.chargebee.v4.models.thirdPartyEntityMapping.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingUpdateEntityParams.java b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingUpdateEntityParams.java
new file mode 100644
index 00000000..1a7b51e4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/params/ThirdPartyEntityMappingUpdateEntityParams.java
@@ -0,0 +1,426 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.thirdPartyEntityMapping.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ThirdPartyEntityMappingUpdateEntityParams {
+
+  private final EntityType entityType;
+
+  private final String entityId;
+
+  private final String thirdPartyEntityId;
+
+  private final String integrationName;
+
+  private final Status status;
+
+  private final java.util.Map<String, Object> oldResource;
+
+  private final java.util.Map<String, Object> mappingMeta;
+
+  private final String failedDependentEntityId;
+
+  private final FailedDependentEntityType failedDependentEntityType;
+
+  private final String errorMessage;
+
+  private final String url;
+
+  private ThirdPartyEntityMappingUpdateEntityParams(
+      ThirdPartyEntityMappingUpdateEntityBuilder builder) {
+
+    this.entityType = builder.entityType;
+
+    this.entityId = builder.entityId;
+
+    this.thirdPartyEntityId = builder.thirdPartyEntityId;
+
+    this.integrationName = builder.integrationName;
+
+    this.status = builder.status;
+
+    this.oldResource = builder.oldResource;
+
+    this.mappingMeta = builder.mappingMeta;
+
+    this.failedDependentEntityId = builder.failedDependentEntityId;
+
+    this.failedDependentEntityType = builder.failedDependentEntityType;
+
+    this.errorMessage = builder.errorMessage;
+
+    this.url = builder.url;
+  }
+
+  public EntityType getEntityType() {
+    return entityType;
+  }
+
+  public String getEntityId() {
+    return entityId;
+  }
+
+  public String getThirdPartyEntityId() {
+    return thirdPartyEntityId;
+  }
+
+  public String getIntegrationName() {
+    return integrationName;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public java.util.Map<String, Object> getOldResource() {
+    return oldResource;
+  }
+
+  public java.util.Map<String, Object> getMappingMeta() {
+    return mappingMeta;
+  }
+
+  public String getFailedDependentEntityId() {
+    return failedDependentEntityId;
+  }
+
+  public FailedDependentEntityType getFailedDependentEntityType() {
+    return failedDependentEntityType;
+  }
+
+  public String getErrorMessage() {
+    return errorMessage;
+  }
+
+  public String getUrl() {
+    return url;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.entityType != null) {
+
+      formData.put("entity_type", this.entityType);
+    }
+
+    if (this.entityId != null) {
+
+      formData.put("entity_id", this.entityId);
+    }
+
+    if (this.thirdPartyEntityId != null) {
+
+      formData.put("third_party_entity_id", this.thirdPartyEntityId);
+    }
+
+    if (this.integrationName != null) {
+
+      formData.put("integration_name", this.integrationName);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.oldResource != null) {
+
+      formData.put("old_resource", JsonUtil.toJson(this.oldResource));
+    }
+
+    if (this.mappingMeta != null) {
+
+      formData.put("mapping_meta", JsonUtil.toJson(this.mappingMeta));
+    }
+
+    if (this.failedDependentEntityId != null) {
+
+      formData.put("failed_dependent_entity_id", this.failedDependentEntityId);
+    }
+
+    if (this.failedDependentEntityType != null) {
+
+      formData.put("failed_dependent_entity_type", this.failedDependentEntityType);
+    }
+
+    if (this.errorMessage != null) {
+
+      formData.put("error_message", this.errorMessage);
+    }
+
+    if (this.url != null) {
+
+      formData.put("url", this.url);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ThirdPartyEntityMappingUpdateEntityParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ThirdPartyEntityMappingUpdateEntityBuilder builder() {
+    return new ThirdPartyEntityMappingUpdateEntityBuilder();
+  }
+
+  public static final class ThirdPartyEntityMappingUpdateEntityBuilder {
+
+    private EntityType entityType;
+
+    private String entityId;
+
+    private String thirdPartyEntityId;
+
+    private String integrationName;
+
+    private Status status;
+
+    private java.util.Map<String, Object> oldResource;
+
+    private java.util.Map<String, Object> mappingMeta;
+
+    private String failedDependentEntityId;
+
+    private FailedDependentEntityType failedDependentEntityType;
+
+    private String errorMessage;
+
+    private String url;
+
+    private ThirdPartyEntityMappingUpdateEntityBuilder() {}
+
+    public ThirdPartyEntityMappingUpdateEntityBuilder entityType(EntityType value) {
+      this.entityType = value;
+      return this;
+    }
+
+    public ThirdPartyEntityMappingUpdateEntityBuilder entityId(String value) {
+      this.entityId = value;
+      return this;
+    }
+
+    public ThirdPartyEntityMappingUpdateEntityBuilder thirdPartyEntityId(String value) {
+      this.thirdPartyEntityId = value;
+      return this;
+    }
+
+    public ThirdPartyEntityMappingUpdateEntityBuilder integrationName(String value) {
+      this.integrationName = value;
+      return this;
+    }
+
+    public ThirdPartyEntityMappingUpdateEntityBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public ThirdPartyEntityMappingUpdateEntityBuilder oldResource(
+        java.util.Map<String, Object> value) {
+      this.oldResource = value;
+      return this;
+    }
+
+    public ThirdPartyEntityMappingUpdateEntityBuilder mappingMeta(
+        java.util.Map<String, Object> value) {
+      this.mappingMeta = value;
+      return this;
+    }
+
+    public ThirdPartyEntityMappingUpdateEntityBuilder failedDependentEntityId(String value) {
+      this.failedDependentEntityId = value;
+      return this;
+    }
+
+    public ThirdPartyEntityMappingUpdateEntityBuilder failedDependentEntityType(
+        FailedDependentEntityType value) {
+      this.failedDependentEntityType = value;
+      return this;
+    }
+
+    public ThirdPartyEntityMappingUpdateEntityBuilder errorMessage(String value) {
+      this.errorMessage = value;
+      return this;
+    }
+
+    public ThirdPartyEntityMappingUpdateEntityBuilder url(String value) {
+      this.url = value;
+      return this;
+    }
+
+    public ThirdPartyEntityMappingUpdateEntityParams build() {
+      return new ThirdPartyEntityMappingUpdateEntityParams(this);
+    }
+  }
+
+  public enum EntityType {
+    CUSTOMER("customer"),
+
+    INVOICE("invoice"),
+
+    CREDIT_NOTE("credit_note"),
+
+    TRANSACTION("transaction"),
+
+    PLAN("plan"),
+
+    ADDON("addon"),
+
+    COUPON("coupon"),
+
+    SUBSCRIPTION("subscription"),
+
+    ORDER("order"),
+
+    QUOTE("quote"),
+
+    ITEM_FAMILY("item_family"),
+
+    ITEM("item"),
+
+    ITEM_PRICE("item_price"),
+
+    TAX_RATE("tax_rate"),
+
+    TAX_GROUP("tax_group"),
+
+    /** An enum member indicating that EntityType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    EntityType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static EntityType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (EntityType enumValue : EntityType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum Status {
+    SYNCED("synced"),
+
+    PARTIALLY_SYNCED("partially_synced"),
+
+    CREATE_FAILED("create_failed"),
+
+    UPDATE_FAILED("update_failed"),
+
+    STOPPED("stopped"),
+
+    IGNORED("ignored"),
+
+    TO_BE_PICKED("to_be_picked"),
+
+    FORCE_SYNC("force_sync"),
+
+    MISMATCH("mismatch"),
+
+    DELETED("deleted"),
+
+    QUEUED("queued"),
+
+    DELETE_FAILED("delete_failed"),
+
+    DELETE_SUCCESS("delete_success"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum FailedDependentEntityType {
+    CUSTOMER("customer"),
+
+    INVOICE("invoice"),
+
+    CREDIT_NOTE("credit_note"),
+
+    TRANSACTION("transaction"),
+
+    PLAN("plan"),
+
+    ADDON("addon"),
+
+    COUPON("coupon"),
+
+    SUBSCRIPTION("subscription"),
+
+    ORDER("order"),
+
+    QUOTE("quote"),
+
+    ITEM_FAMILY("item_family"),
+
+    ITEM("item"),
+
+    ITEM_PRICE("item_price"),
+
+    TAX_RATE("tax_rate"),
+
+    TAX_GROUP("tax_group"),
+
+    /**
+     * An enum member indicating that FailedDependentEntityType was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    FailedDependentEntityType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static FailedDependentEntityType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (FailedDependentEntityType enumValue : FailedDependentEntityType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/responses/ThirdPartyEntityMappingListAllResponse.java b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/responses/ThirdPartyEntityMappingListAllResponse.java
new file mode 100644
index 00000000..15fa8315
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/responses/ThirdPartyEntityMappingListAllResponse.java
@@ -0,0 +1,80 @@
+package com.chargebee.v4.models.thirdPartyEntityMapping.responses;
+
+import com.chargebee.v4.models.thirdPartyEntityMapping.ThirdPartyEntityMapping;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ThirdPartyEntityMappingListAll operation. Contains the response
+ * data from a single resource get operation.
+ */
+public final class ThirdPartyEntityMappingListAllResponse extends BaseResponse {
+  private final ThirdPartyEntityMapping thirdPartyEntityMapping;
+
+  private ThirdPartyEntityMappingListAllResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.thirdPartyEntityMapping = builder.thirdPartyEntityMapping;
+  }
+
+  /** Parse JSON response into ThirdPartyEntityMappingListAllResponse object. */
+  public static ThirdPartyEntityMappingListAllResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ThirdPartyEntityMappingListAllResponse object with HTTP response. */
+  public static ThirdPartyEntityMappingListAllResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __thirdPartyEntityMappingJson = JsonUtil.getObject(json, "third_party_entity_mapping");
+      if (__thirdPartyEntityMappingJson != null) {
+        builder.thirdPartyEntityMapping(
+            ThirdPartyEntityMapping.fromJson(__thirdPartyEntityMappingJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse ThirdPartyEntityMappingListAllResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ThirdPartyEntityMappingListAllResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ThirdPartyEntityMappingListAllResponse. */
+  public static class Builder {
+
+    private ThirdPartyEntityMapping thirdPartyEntityMapping;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder thirdPartyEntityMapping(ThirdPartyEntityMapping thirdPartyEntityMapping) {
+      this.thirdPartyEntityMapping = thirdPartyEntityMapping;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ThirdPartyEntityMappingListAllResponse build() {
+      return new ThirdPartyEntityMappingListAllResponse(this);
+    }
+  }
+
+  /** Get the thirdPartyEntityMapping from the response. */
+  public ThirdPartyEntityMapping getThirdPartyEntityMapping() {
+    return thirdPartyEntityMapping;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/thirdPartyEntityMapping/ThirdPartyEntityMappingListResponse.java b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/responses/ThirdPartyEntityMappingListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/thirdPartyEntityMapping/ThirdPartyEntityMappingListResponse.java
rename to src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/responses/ThirdPartyEntityMappingListResponse.java
index 54ca9045..6432857c 100644
--- a/src/main/java/com/chargebee/v4/core/responses/thirdPartyEntityMapping/ThirdPartyEntityMappingListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/responses/ThirdPartyEntityMappingListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.thirdPartyEntityMapping;
+package com.chargebee.v4.models.thirdPartyEntityMapping.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.thirdPartyEntityMapping.ThirdPartyEntityMapping;
+import com.chargebee.v4.models.thirdPartyEntityMapping.ThirdPartyEntityMapping;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.ThirdPartyEntityMappingService;
-import com.chargebee.v4.core.models.thirdPartyEntityMapping.params.ThirdPartyEntityMappingListParams;
+import com.chargebee.v4.services.ThirdPartyEntityMappingService;
+import com.chargebee.v4.models.thirdPartyEntityMapping.params.ThirdPartyEntityMappingListParams;
 
 /**
  * Immutable response object for ThirdPartyEntityMappingList operation. Contains paginated list
@@ -104,9 +105,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public ThirdPartyEntityMappingListResponse nextPage() throws Exception {
+  public ThirdPartyEntityMappingListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/responses/ThirdPartyEntityMappingRetrieveEntityResponse.java b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/responses/ThirdPartyEntityMappingRetrieveEntityResponse.java
new file mode 100644
index 00000000..ebc254f6
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/responses/ThirdPartyEntityMappingRetrieveEntityResponse.java
@@ -0,0 +1,83 @@
+package com.chargebee.v4.models.thirdPartyEntityMapping.responses;
+
+import com.chargebee.v4.models.thirdPartyEntityMapping.ThirdPartyEntityMapping;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ThirdPartyEntityMappingRetrieveEntity operation. Contains the
+ * response data from a single resource get operation.
+ */
+public final class ThirdPartyEntityMappingRetrieveEntityResponse extends BaseResponse {
+  private final ThirdPartyEntityMapping thirdPartyEntityMapping;
+
+  private ThirdPartyEntityMappingRetrieveEntityResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.thirdPartyEntityMapping = builder.thirdPartyEntityMapping;
+  }
+
+  /** Parse JSON response into ThirdPartyEntityMappingRetrieveEntityResponse object. */
+  public static ThirdPartyEntityMappingRetrieveEntityResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into ThirdPartyEntityMappingRetrieveEntityResponse object with HTTP
+   * response.
+   */
+  public static ThirdPartyEntityMappingRetrieveEntityResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __thirdPartyEntityMappingJson = JsonUtil.getObject(json, "third_party_entity_mapping");
+      if (__thirdPartyEntityMappingJson != null) {
+        builder.thirdPartyEntityMapping(
+            ThirdPartyEntityMapping.fromJson(__thirdPartyEntityMappingJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse ThirdPartyEntityMappingRetrieveEntityResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ThirdPartyEntityMappingRetrieveEntityResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ThirdPartyEntityMappingRetrieveEntityResponse. */
+  public static class Builder {
+
+    private ThirdPartyEntityMapping thirdPartyEntityMapping;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder thirdPartyEntityMapping(ThirdPartyEntityMapping thirdPartyEntityMapping) {
+      this.thirdPartyEntityMapping = thirdPartyEntityMapping;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ThirdPartyEntityMappingRetrieveEntityResponse build() {
+      return new ThirdPartyEntityMappingRetrieveEntityResponse(this);
+    }
+  }
+
+  /** Get the thirdPartyEntityMapping from the response. */
+  public ThirdPartyEntityMapping getThirdPartyEntityMapping() {
+    return thirdPartyEntityMapping;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/thirdPartyEntityMapping/ThirdPartyEntityMappingUpdateEntityResponse.java b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/responses/ThirdPartyEntityMappingUpdateEntityResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/thirdPartyEntityMapping/ThirdPartyEntityMappingUpdateEntityResponse.java
rename to src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/responses/ThirdPartyEntityMappingUpdateEntityResponse.java
index a91c5727..dab348e1 100644
--- a/src/main/java/com/chargebee/v4/core/responses/thirdPartyEntityMapping/ThirdPartyEntityMappingUpdateEntityResponse.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/responses/ThirdPartyEntityMappingUpdateEntityResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.thirdPartyEntityMapping;
+package com.chargebee.v4.models.thirdPartyEntityMapping.responses;
 
-import com.chargebee.v4.core.models.thirdPartyEntityMapping.ThirdPartyEntityMapping;
+import com.chargebee.v4.models.thirdPartyEntityMapping.ThirdPartyEntityMapping;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartyPaymentMethod/ThirdPartyPaymentMethod.java b/src/main/java/com/chargebee/v4/models/thirdPartyPaymentMethod/ThirdPartyPaymentMethod.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/thirdPartyPaymentMethod/ThirdPartyPaymentMethod.java
rename to src/main/java/com/chargebee/v4/models/thirdPartyPaymentMethod/ThirdPartyPaymentMethod.java
index 9f1926c8..14a622c4 100644
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartyPaymentMethod/ThirdPartyPaymentMethod.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartyPaymentMethod/ThirdPartyPaymentMethod.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.thirdPartyPaymentMethod;
+package com.chargebee.v4.models.thirdPartyPaymentMethod;
 
 import com.chargebee.v4.internal.JsonUtil;
 
@@ -83,6 +83,16 @@ public enum Type {
 
     PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
 
+    ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+    KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+    PAY_BY_BANK("pay_by_bank"),
+
+    TRUSTLY("trustly"),
+
+    STABLECOIN("stablecoin"),
+
     /** An enum member indicating that Type was instantiated with an unknown value. */
     _UNKNOWN(null);
     private final String value;
@@ -217,6 +227,8 @@ public enum Gateway {
 
     DEUTSCHE_BANK("deutsche_bank"),
 
+    EZIDEBIT("ezidebit"),
+
     NOT_APPLICABLE("not_applicable"),
 
     /** An enum member indicating that Gateway was instantiated with an unknown value. */
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/ThirdPartySyncDetail.java b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/ThirdPartySyncDetail.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/ThirdPartySyncDetail.java
rename to src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/ThirdPartySyncDetail.java
index 558132aa..bb526ed3 100644
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/ThirdPartySyncDetail.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/ThirdPartySyncDetail.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.thirdPartySyncDetail;
+package com.chargebee.v4.models.thirdPartySyncDetail;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/params/ThirdPartySyncDetailCreateParams.java b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/params/ThirdPartySyncDetailCreateParams.java
new file mode 100644
index 00000000..0e3b3bd4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/params/ThirdPartySyncDetailCreateParams.java
@@ -0,0 +1,135 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.thirdPartySyncDetail.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ThirdPartySyncDetailCreateParams {
+
+  private final java.util.Map<String, Object> context;
+
+  private final ThirdPartyConfigurationParams thirdPartyConfiguration;
+
+  private ThirdPartySyncDetailCreateParams(ThirdPartySyncDetailCreateBuilder builder) {
+
+    this.context = builder.context;
+
+    this.thirdPartyConfiguration = builder.thirdPartyConfiguration;
+  }
+
+  public java.util.Map<String, Object> getContext() {
+    return context;
+  }
+
+  public ThirdPartyConfigurationParams getThirdPartyConfiguration() {
+    return thirdPartyConfiguration;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.context != null) {
+
+      formData.put("context", JsonUtil.toJson(this.context));
+    }
+
+    if (this.thirdPartyConfiguration != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.thirdPartyConfiguration.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "third_party_configuration[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ThirdPartySyncDetailCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ThirdPartySyncDetailCreateBuilder builder() {
+    return new ThirdPartySyncDetailCreateBuilder();
+  }
+
+  public static final class ThirdPartySyncDetailCreateBuilder {
+
+    private java.util.Map<String, Object> context;
+
+    private ThirdPartyConfigurationParams thirdPartyConfiguration;
+
+    private ThirdPartySyncDetailCreateBuilder() {}
+
+    public ThirdPartySyncDetailCreateBuilder context(java.util.Map<String, Object> value) {
+      this.context = value;
+      return this;
+    }
+
+    public ThirdPartySyncDetailCreateBuilder thirdPartyConfiguration(
+        ThirdPartyConfigurationParams value) {
+      this.thirdPartyConfiguration = value;
+      return this;
+    }
+
+    public ThirdPartySyncDetailCreateParams build() {
+      return new ThirdPartySyncDetailCreateParams(this);
+    }
+  }
+
+  public static final class ThirdPartyConfigurationParams {
+
+    private final String integrationName;
+
+    private ThirdPartyConfigurationParams(ThirdPartyConfigurationBuilder builder) {
+
+      this.integrationName = builder.integrationName;
+    }
+
+    public String getIntegrationName() {
+      return integrationName;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.integrationName != null) {
+
+        formData.put("integration_name", this.integrationName);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ThirdPartyConfigurationParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ThirdPartyConfigurationBuilder builder() {
+      return new ThirdPartyConfigurationBuilder();
+    }
+
+    public static final class ThirdPartyConfigurationBuilder {
+
+      private String integrationName;
+
+      private ThirdPartyConfigurationBuilder() {}
+
+      public ThirdPartyConfigurationBuilder integrationName(String value) {
+        this.integrationName = value;
+        return this;
+      }
+
+      public ThirdPartyConfigurationParams build() {
+        return new ThirdPartyConfigurationParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/params/ThirdPartySyncDetailRetrieveLatestSyncParams.java b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/params/ThirdPartySyncDetailRetrieveLatestSyncParams.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/params/ThirdPartySyncDetailRetrieveLatestSyncParams.java
rename to src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/params/ThirdPartySyncDetailRetrieveLatestSyncParams.java
index 51dde98d..e662beef 100644
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/params/ThirdPartySyncDetailRetrieveLatestSyncParams.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/params/ThirdPartySyncDetailRetrieveLatestSyncParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.thirdPartySyncDetail.params;
+package com.chargebee.v4.models.thirdPartySyncDetail.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/params/ThirdPartySyncDetailRetrieveParams.java b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/params/ThirdPartySyncDetailRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/params/ThirdPartySyncDetailRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/params/ThirdPartySyncDetailRetrieveParams.java
index eaade793..f2b23cdb 100644
--- a/src/main/java/com/chargebee/v4/core/models/thirdPartySyncDetail/params/ThirdPartySyncDetailRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/params/ThirdPartySyncDetailRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.thirdPartySyncDetail.params;
+package com.chargebee.v4.models.thirdPartySyncDetail.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/params/ThirdPartySyncDetailUpdateParams.java b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/params/ThirdPartySyncDetailUpdateParams.java
new file mode 100644
index 00000000..cfaa9010
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/params/ThirdPartySyncDetailUpdateParams.java
@@ -0,0 +1,115 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.thirdPartySyncDetail.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ThirdPartySyncDetailUpdateParams {
+
+  private final Status status;
+
+  private final java.util.Map<String, Object> context;
+
+  private ThirdPartySyncDetailUpdateParams(ThirdPartySyncDetailUpdateBuilder builder) {
+
+    this.status = builder.status;
+
+    this.context = builder.context;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public java.util.Map<String, Object> getContext() {
+    return context;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.context != null) {
+
+      formData.put("context", JsonUtil.toJson(this.context));
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for ThirdPartySyncDetailUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ThirdPartySyncDetailUpdateBuilder builder() {
+    return new ThirdPartySyncDetailUpdateBuilder();
+  }
+
+  public static final class ThirdPartySyncDetailUpdateBuilder {
+
+    private Status status;
+
+    private java.util.Map<String, Object> context;
+
+    private ThirdPartySyncDetailUpdateBuilder() {}
+
+    public ThirdPartySyncDetailUpdateBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public ThirdPartySyncDetailUpdateBuilder context(java.util.Map<String, Object> value) {
+      this.context = value;
+      return this;
+    }
+
+    public ThirdPartySyncDetailUpdateParams build() {
+      return new ThirdPartySyncDetailUpdateParams(this);
+    }
+  }
+
+  public enum Status {
+    SUCCEEDED("succeeded"),
+
+    FAILED("failed"),
+
+    STARTED("started"),
+
+    RUNNING("running"),
+
+    ABORTED("aborted"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/thirdPartySyncDetail/ThirdPartySyncDetailCreateResponse.java b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/responses/ThirdPartySyncDetailCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/thirdPartySyncDetail/ThirdPartySyncDetailCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/responses/ThirdPartySyncDetailCreateResponse.java
index 2bd8aa3f..a42c2a72 100644
--- a/src/main/java/com/chargebee/v4/core/responses/thirdPartySyncDetail/ThirdPartySyncDetailCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/responses/ThirdPartySyncDetailCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.thirdPartySyncDetail;
+package com.chargebee.v4.models.thirdPartySyncDetail.responses;
 
-import com.chargebee.v4.core.models.thirdPartySyncDetail.ThirdPartySyncDetail;
+import com.chargebee.v4.models.thirdPartySyncDetail.ThirdPartySyncDetail;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/responses/ThirdPartySyncDetailRetrieveLatestSyncResponse.java b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/responses/ThirdPartySyncDetailRetrieveLatestSyncResponse.java
new file mode 100644
index 00000000..789aae18
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/responses/ThirdPartySyncDetailRetrieveLatestSyncResponse.java
@@ -0,0 +1,82 @@
+package com.chargebee.v4.models.thirdPartySyncDetail.responses;
+
+import com.chargebee.v4.models.thirdPartySyncDetail.ThirdPartySyncDetail;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ThirdPartySyncDetailRetrieveLatestSync operation. Contains the
+ * response data from a single resource get operation.
+ */
+public final class ThirdPartySyncDetailRetrieveLatestSyncResponse extends BaseResponse {
+  private final ThirdPartySyncDetail thirdPartySyncDetail;
+
+  private ThirdPartySyncDetailRetrieveLatestSyncResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.thirdPartySyncDetail = builder.thirdPartySyncDetail;
+  }
+
+  /** Parse JSON response into ThirdPartySyncDetailRetrieveLatestSyncResponse object. */
+  public static ThirdPartySyncDetailRetrieveLatestSyncResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /**
+   * Parse JSON response into ThirdPartySyncDetailRetrieveLatestSyncResponse object with HTTP
+   * response.
+   */
+  public static ThirdPartySyncDetailRetrieveLatestSyncResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __thirdPartySyncDetailJson = JsonUtil.getObject(json, "third_party_sync_detail");
+      if (__thirdPartySyncDetailJson != null) {
+        builder.thirdPartySyncDetail(ThirdPartySyncDetail.fromJson(__thirdPartySyncDetailJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse ThirdPartySyncDetailRetrieveLatestSyncResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ThirdPartySyncDetailRetrieveLatestSyncResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ThirdPartySyncDetailRetrieveLatestSyncResponse. */
+  public static class Builder {
+
+    private ThirdPartySyncDetail thirdPartySyncDetail;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder thirdPartySyncDetail(ThirdPartySyncDetail thirdPartySyncDetail) {
+      this.thirdPartySyncDetail = thirdPartySyncDetail;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ThirdPartySyncDetailRetrieveLatestSyncResponse build() {
+      return new ThirdPartySyncDetailRetrieveLatestSyncResponse(this);
+    }
+  }
+
+  /** Get the thirdPartySyncDetail from the response. */
+  public ThirdPartySyncDetail getThirdPartySyncDetail() {
+    return thirdPartySyncDetail;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/responses/ThirdPartySyncDetailRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/responses/ThirdPartySyncDetailRetrieveResponse.java
new file mode 100644
index 00000000..8359f0ad
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/responses/ThirdPartySyncDetailRetrieveResponse.java
@@ -0,0 +1,78 @@
+package com.chargebee.v4.models.thirdPartySyncDetail.responses;
+
+import com.chargebee.v4.models.thirdPartySyncDetail.ThirdPartySyncDetail;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for ThirdPartySyncDetailRetrieve operation. Contains the response data
+ * from a single resource get operation.
+ */
+public final class ThirdPartySyncDetailRetrieveResponse extends BaseResponse {
+  private final ThirdPartySyncDetail thirdPartySyncDetail;
+
+  private ThirdPartySyncDetailRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.thirdPartySyncDetail = builder.thirdPartySyncDetail;
+  }
+
+  /** Parse JSON response into ThirdPartySyncDetailRetrieveResponse object. */
+  public static ThirdPartySyncDetailRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into ThirdPartySyncDetailRetrieveResponse object with HTTP response. */
+  public static ThirdPartySyncDetailRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __thirdPartySyncDetailJson = JsonUtil.getObject(json, "third_party_sync_detail");
+      if (__thirdPartySyncDetailJson != null) {
+        builder.thirdPartySyncDetail(ThirdPartySyncDetail.fromJson(__thirdPartySyncDetailJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse ThirdPartySyncDetailRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for ThirdPartySyncDetailRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for ThirdPartySyncDetailRetrieveResponse. */
+  public static class Builder {
+
+    private ThirdPartySyncDetail thirdPartySyncDetail;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder thirdPartySyncDetail(ThirdPartySyncDetail thirdPartySyncDetail) {
+      this.thirdPartySyncDetail = thirdPartySyncDetail;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public ThirdPartySyncDetailRetrieveResponse build() {
+      return new ThirdPartySyncDetailRetrieveResponse(this);
+    }
+  }
+
+  /** Get the thirdPartySyncDetail from the response. */
+  public ThirdPartySyncDetail getThirdPartySyncDetail() {
+    return thirdPartySyncDetail;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/thirdPartySyncDetail/ThirdPartySyncDetailUpdateResponse.java b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/responses/ThirdPartySyncDetailUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/thirdPartySyncDetail/ThirdPartySyncDetailUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/responses/ThirdPartySyncDetailUpdateResponse.java
index fe15089c..6f57e8f2 100644
--- a/src/main/java/com/chargebee/v4/core/responses/thirdPartySyncDetail/ThirdPartySyncDetailUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/thirdPartySyncDetail/responses/ThirdPartySyncDetailUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.thirdPartySyncDetail;
+package com.chargebee.v4.models.thirdPartySyncDetail.responses;
 
-import com.chargebee.v4.core.models.thirdPartySyncDetail.ThirdPartySyncDetail;
+import com.chargebee.v4.models.thirdPartySyncDetail.ThirdPartySyncDetail;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/timeMachine/TimeMachine.java b/src/main/java/com/chargebee/v4/models/timeMachine/TimeMachine.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/timeMachine/TimeMachine.java
rename to src/main/java/com/chargebee/v4/models/timeMachine/TimeMachine.java
index e634e4e9..a9dec38b 100644
--- a/src/main/java/com/chargebee/v4/core/models/timeMachine/TimeMachine.java
+++ b/src/main/java/com/chargebee/v4/models/timeMachine/TimeMachine.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.timeMachine;
+package com.chargebee.v4.models.timeMachine;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/timeMachine/params/TimeMachineRetrieveParams.java b/src/main/java/com/chargebee/v4/models/timeMachine/params/TimeMachineRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/timeMachine/params/TimeMachineRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/timeMachine/params/TimeMachineRetrieveParams.java
index 6be10504..a956f280 100644
--- a/src/main/java/com/chargebee/v4/core/models/timeMachine/params/TimeMachineRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/timeMachine/params/TimeMachineRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.timeMachine.params;
+package com.chargebee.v4.models.timeMachine.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/timeMachine/params/TimeMachineStartAfreshParams.java b/src/main/java/com/chargebee/v4/models/timeMachine/params/TimeMachineStartAfreshParams.java
new file mode 100644
index 00000000..68dd9c7c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/timeMachine/params/TimeMachineStartAfreshParams.java
@@ -0,0 +1,61 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.timeMachine.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class TimeMachineStartAfreshParams {
+
+  private final Timestamp genesisTime;
+
+  private TimeMachineStartAfreshParams(TimeMachineStartAfreshBuilder builder) {
+
+    this.genesisTime = builder.genesisTime;
+  }
+
+  public Timestamp getGenesisTime() {
+    return genesisTime;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.genesisTime != null) {
+
+      formData.put("genesis_time", this.genesisTime);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for TimeMachineStartAfreshParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static TimeMachineStartAfreshBuilder builder() {
+    return new TimeMachineStartAfreshBuilder();
+  }
+
+  public static final class TimeMachineStartAfreshBuilder {
+
+    private Timestamp genesisTime;
+
+    private TimeMachineStartAfreshBuilder() {}
+
+    public TimeMachineStartAfreshBuilder genesisTime(Timestamp value) {
+      this.genesisTime = value;
+      return this;
+    }
+
+    public TimeMachineStartAfreshParams build() {
+      return new TimeMachineStartAfreshParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/timeMachine/params/TimeMachineTravelForwardParams.java b/src/main/java/com/chargebee/v4/models/timeMachine/params/TimeMachineTravelForwardParams.java
new file mode 100644
index 00000000..56db0411
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/timeMachine/params/TimeMachineTravelForwardParams.java
@@ -0,0 +1,61 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.timeMachine.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class TimeMachineTravelForwardParams {
+
+  private final Timestamp destinationTime;
+
+  private TimeMachineTravelForwardParams(TimeMachineTravelForwardBuilder builder) {
+
+    this.destinationTime = builder.destinationTime;
+  }
+
+  public Timestamp getDestinationTime() {
+    return destinationTime;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.destinationTime != null) {
+
+      formData.put("destination_time", this.destinationTime);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for TimeMachineTravelForwardParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static TimeMachineTravelForwardBuilder builder() {
+    return new TimeMachineTravelForwardBuilder();
+  }
+
+  public static final class TimeMachineTravelForwardBuilder {
+
+    private Timestamp destinationTime;
+
+    private TimeMachineTravelForwardBuilder() {}
+
+    public TimeMachineTravelForwardBuilder destinationTime(Timestamp value) {
+      this.destinationTime = value;
+      return this;
+    }
+
+    public TimeMachineTravelForwardParams build() {
+      return new TimeMachineTravelForwardParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/timeMachine/responses/TimeMachineRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/timeMachine/responses/TimeMachineRetrieveResponse.java
new file mode 100644
index 00000000..4820eec7
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/timeMachine/responses/TimeMachineRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.timeMachine.responses;
+
+import com.chargebee.v4.models.timeMachine.TimeMachine;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for TimeMachineRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class TimeMachineRetrieveResponse extends BaseResponse {
+  private final TimeMachine timeMachine;
+
+  private TimeMachineRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.timeMachine = builder.timeMachine;
+  }
+
+  /** Parse JSON response into TimeMachineRetrieveResponse object. */
+  public static TimeMachineRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into TimeMachineRetrieveResponse object with HTTP response. */
+  public static TimeMachineRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __timeMachineJson = JsonUtil.getObject(json, "time_machine");
+      if (__timeMachineJson != null) {
+        builder.timeMachine(TimeMachine.fromJson(__timeMachineJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse TimeMachineRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for TimeMachineRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for TimeMachineRetrieveResponse. */
+  public static class Builder {
+
+    private TimeMachine timeMachine;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder timeMachine(TimeMachine timeMachine) {
+      this.timeMachine = timeMachine;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public TimeMachineRetrieveResponse build() {
+      return new TimeMachineRetrieveResponse(this);
+    }
+  }
+
+  /** Get the timeMachine from the response. */
+  public TimeMachine getTimeMachine() {
+    return timeMachine;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/timeMachine/TimeMachineStartAfreshResponse.java b/src/main/java/com/chargebee/v4/models/timeMachine/responses/TimeMachineStartAfreshResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/timeMachine/TimeMachineStartAfreshResponse.java
rename to src/main/java/com/chargebee/v4/models/timeMachine/responses/TimeMachineStartAfreshResponse.java
index 13cdf409..14354d6d 100644
--- a/src/main/java/com/chargebee/v4/core/responses/timeMachine/TimeMachineStartAfreshResponse.java
+++ b/src/main/java/com/chargebee/v4/models/timeMachine/responses/TimeMachineStartAfreshResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.timeMachine;
+package com.chargebee.v4.models.timeMachine.responses;
 
-import com.chargebee.v4.core.models.timeMachine.TimeMachine;
+import com.chargebee.v4.models.timeMachine.TimeMachine;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/timeMachine/TimeMachineTravelForwardResponse.java b/src/main/java/com/chargebee/v4/models/timeMachine/responses/TimeMachineTravelForwardResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/timeMachine/TimeMachineTravelForwardResponse.java
rename to src/main/java/com/chargebee/v4/models/timeMachine/responses/TimeMachineTravelForwardResponse.java
index 84194416..64ff03a6 100644
--- a/src/main/java/com/chargebee/v4/core/responses/timeMachine/TimeMachineTravelForwardResponse.java
+++ b/src/main/java/com/chargebee/v4/models/timeMachine/responses/TimeMachineTravelForwardResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.timeMachine;
+package com.chargebee.v4.models.timeMachine.responses;
 
-import com.chargebee.v4.core.models.timeMachine.TimeMachine;
+import com.chargebee.v4.models.timeMachine.TimeMachine;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/token/Token.java b/src/main/java/com/chargebee/v4/models/token/Token.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/token/Token.java
rename to src/main/java/com/chargebee/v4/models/token/Token.java
index 30f48632..0a7b020e 100644
--- a/src/main/java/com/chargebee/v4/core/models/token/Token.java
+++ b/src/main/java/com/chargebee/v4/models/token/Token.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.token;
+package com.chargebee.v4.models.token;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -184,6 +184,8 @@ public enum Gateway {
 
     DEUTSCHE_BANK("deutsche_bank"),
 
+    EZIDEBIT("ezidebit"),
+
     NOT_APPLICABLE("not_applicable"),
 
     /** An enum member indicating that Gateway was instantiated with an unknown value. */
@@ -260,6 +262,16 @@ public enum PaymentMethodType {
 
     PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
 
+    ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+    KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+    PAY_BY_BANK("pay_by_bank"),
+
+    TRUSTLY("trustly"),
+
+    STABLECOIN("stablecoin"),
+
     /** An enum member indicating that PaymentMethodType was instantiated with an unknown value. */
     _UNKNOWN(null);
     private final String value;
diff --git a/src/main/java/com/chargebee/v4/core/models/tpSiteUser/TpSiteUser.java b/src/main/java/com/chargebee/v4/models/tpSiteUser/TpSiteUser.java
similarity index 94%
rename from src/main/java/com/chargebee/v4/core/models/tpSiteUser/TpSiteUser.java
rename to src/main/java/com/chargebee/v4/models/tpSiteUser/TpSiteUser.java
index a067bf03..02f24dff 100644
--- a/src/main/java/com/chargebee/v4/core/models/tpSiteUser/TpSiteUser.java
+++ b/src/main/java/com/chargebee/v4/models/tpSiteUser/TpSiteUser.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.tpSiteUser;
+package com.chargebee.v4.models.tpSiteUser;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/models/tpSiteUser/params/GuestsForTpSiteUserParams.java b/src/main/java/com/chargebee/v4/models/tpSiteUser/params/GuestsForTpSiteUserParams.java
new file mode 100644
index 00000000..a143889f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/tpSiteUser/params/GuestsForTpSiteUserParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.tpSiteUser.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class GuestsForTpSiteUserParams {
+
+  private final Map<String, Object> queryParams;
+
+  private GuestsForTpSiteUserParams(GuestsForTpSiteUserBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public GuestsForTpSiteUserBuilder toBuilder() {
+    GuestsForTpSiteUserBuilder builder = new GuestsForTpSiteUserBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for GuestsForTpSiteUserParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static GuestsForTpSiteUserBuilder builder() {
+    return new GuestsForTpSiteUserBuilder();
+  }
+
+  public static final class GuestsForTpSiteUserBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private GuestsForTpSiteUserBuilder() {}
+
+    public GuestsForTpSiteUserBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public GuestsForTpSiteUserBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public GuestsForTpSiteUserParams build() {
+      return new GuestsForTpSiteUserParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/tpSiteUser/params/TpSiteUserPayNowEnableLiveParams.java b/src/main/java/com/chargebee/v4/models/tpSiteUser/params/TpSiteUserPayNowEnableLiveParams.java
new file mode 100644
index 00000000..d107b4a5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/tpSiteUser/params/TpSiteUserPayNowEnableLiveParams.java
@@ -0,0 +1,80 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.tpSiteUser.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class TpSiteUserPayNowEnableLiveParams {
+
+  private final String domain;
+
+  private final String hostedPageToken;
+
+  private TpSiteUserPayNowEnableLiveParams(TpSiteUserPayNowEnableLiveBuilder builder) {
+
+    this.domain = builder.domain;
+
+    this.hostedPageToken = builder.hostedPageToken;
+  }
+
+  public String getDomain() {
+    return domain;
+  }
+
+  public String getHostedPageToken() {
+    return hostedPageToken;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.domain != null) {
+
+      formData.put("domain", this.domain);
+    }
+
+    if (this.hostedPageToken != null) {
+
+      formData.put("hosted_page_token", this.hostedPageToken);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for TpSiteUserPayNowEnableLiveParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static TpSiteUserPayNowEnableLiveBuilder builder() {
+    return new TpSiteUserPayNowEnableLiveBuilder();
+  }
+
+  public static final class TpSiteUserPayNowEnableLiveBuilder {
+
+    private String domain;
+
+    private String hostedPageToken;
+
+    private TpSiteUserPayNowEnableLiveBuilder() {}
+
+    public TpSiteUserPayNowEnableLiveBuilder domain(String value) {
+      this.domain = value;
+      return this;
+    }
+
+    public TpSiteUserPayNowEnableLiveBuilder hostedPageToken(String value) {
+      this.hostedPageToken = value;
+      return this;
+    }
+
+    public TpSiteUserPayNowEnableLiveParams build() {
+      return new TpSiteUserPayNowEnableLiveParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/tpSiteUser/params/UsersForTpSiteUserParams.java b/src/main/java/com/chargebee/v4/models/tpSiteUser/params/UsersForTpSiteUserParams.java
new file mode 100644
index 00000000..257d528c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/tpSiteUser/params/UsersForTpSiteUserParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.tpSiteUser.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class UsersForTpSiteUserParams {
+
+  private final Map<String, Object> queryParams;
+
+  private UsersForTpSiteUserParams(UsersForTpSiteUserBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public UsersForTpSiteUserBuilder toBuilder() {
+    UsersForTpSiteUserBuilder builder = new UsersForTpSiteUserBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for UsersForTpSiteUserParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UsersForTpSiteUserBuilder builder() {
+    return new UsersForTpSiteUserBuilder();
+  }
+
+  public static final class UsersForTpSiteUserBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private UsersForTpSiteUserBuilder() {}
+
+    public UsersForTpSiteUserBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public UsersForTpSiteUserBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public UsersForTpSiteUserParams build() {
+      return new UsersForTpSiteUserParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/tpSiteUser/responses/GuestsForTpSiteUserResponse.java b/src/main/java/com/chargebee/v4/models/tpSiteUser/responses/GuestsForTpSiteUserResponse.java
new file mode 100644
index 00000000..cc63602f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/tpSiteUser/responses/GuestsForTpSiteUserResponse.java
@@ -0,0 +1,172 @@
+package com.chargebee.v4.models.tpSiteUser.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.tpSiteUser.TpSiteUser;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.TpSiteUserService;
+import com.chargebee.v4.models.tpSiteUser.params.GuestsForTpSiteUserParams;
+
+/** Immutable response object for GuestsForTpSiteUser operation. Contains paginated list data. */
+public final class GuestsForTpSiteUserResponse {
+
+  private final List<TpSiteUserGuestsForTpSiteUserItem> list;
+
+  private final String nextOffset;
+
+  private final String tpSiteUserDomain;
+
+  private final TpSiteUserService service;
+  private final GuestsForTpSiteUserParams originalParams;
+  private final Response httpResponse;
+
+  private GuestsForTpSiteUserResponse(
+      List<TpSiteUserGuestsForTpSiteUserItem> list,
+      String nextOffset,
+      String tpSiteUserDomain,
+      TpSiteUserService service,
+      GuestsForTpSiteUserParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.tpSiteUserDomain = tpSiteUserDomain;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into GuestsForTpSiteUserResponse object (no service context). Use this when
+   * you only need to read a single page (no nextPage()).
+   */
+  public static GuestsForTpSiteUserResponse fromJson(String json) {
+    try {
+
+      List<TpSiteUserGuestsForTpSiteUserItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(TpSiteUserGuestsForTpSiteUserItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new GuestsForTpSiteUserResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse GuestsForTpSiteUserResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into GuestsForTpSiteUserResponse object with service context for pagination
+   * (enables nextPage()).
+   */
+  public static GuestsForTpSiteUserResponse fromJson(
+      String json,
+      TpSiteUserService service,
+      GuestsForTpSiteUserParams originalParams,
+      String tpSiteUserDomain,
+      Response httpResponse) {
+    try {
+
+      List<TpSiteUserGuestsForTpSiteUserItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(TpSiteUserGuestsForTpSiteUserItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new GuestsForTpSiteUserResponse(
+          list, nextOffset, tpSiteUserDomain, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse GuestsForTpSiteUserResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<TpSiteUserGuestsForTpSiteUserItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public GuestsForTpSiteUserResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    GuestsForTpSiteUserParams nextParams =
+        (originalParams != null ? originalParams.toBuilder() : GuestsForTpSiteUserParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.guestsForTpSiteUser(tpSiteUserDomain, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class TpSiteUserGuestsForTpSiteUserItem {
+
+    private TpSiteUser tpSiteUser;
+
+    public TpSiteUser getTpSiteUser() {
+      return tpSiteUser;
+    }
+
+    public static TpSiteUserGuestsForTpSiteUserItem fromJson(String json) {
+      TpSiteUserGuestsForTpSiteUserItem item = new TpSiteUserGuestsForTpSiteUserItem();
+
+      String __tpSiteUserJson = JsonUtil.getObject(json, "tp_site_user");
+      if (__tpSiteUserJson != null) {
+        item.tpSiteUser = TpSiteUser.fromJson(__tpSiteUserJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/tpSiteUser/TpSiteUserPayNowEnableLiveResponse.java b/src/main/java/com/chargebee/v4/models/tpSiteUser/responses/TpSiteUserPayNowEnableLiveResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/tpSiteUser/TpSiteUserPayNowEnableLiveResponse.java
rename to src/main/java/com/chargebee/v4/models/tpSiteUser/responses/TpSiteUserPayNowEnableLiveResponse.java
index c62a93d5..764683fa 100644
--- a/src/main/java/com/chargebee/v4/core/responses/tpSiteUser/TpSiteUserPayNowEnableLiveResponse.java
+++ b/src/main/java/com/chargebee/v4/models/tpSiteUser/responses/TpSiteUserPayNowEnableLiveResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.tpSiteUser;
+package com.chargebee.v4.models.tpSiteUser.responses;
 
-import com.chargebee.v4.core.models.tpSiteUser.TpSiteUser;
+import com.chargebee.v4.models.tpSiteUser.TpSiteUser;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/tpSiteUser/responses/UsersForTpSiteUserResponse.java b/src/main/java/com/chargebee/v4/models/tpSiteUser/responses/UsersForTpSiteUserResponse.java
new file mode 100644
index 00000000..74e09df6
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/tpSiteUser/responses/UsersForTpSiteUserResponse.java
@@ -0,0 +1,172 @@
+package com.chargebee.v4.models.tpSiteUser.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.tpSiteUser.TpSiteUser;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.TpSiteUserService;
+import com.chargebee.v4.models.tpSiteUser.params.UsersForTpSiteUserParams;
+
+/** Immutable response object for UsersForTpSiteUser operation. Contains paginated list data. */
+public final class UsersForTpSiteUserResponse {
+
+  private final List<TpSiteUserUsersForTpSiteUserItem> list;
+
+  private final String nextOffset;
+
+  private final String tpSiteUserDomain;
+
+  private final TpSiteUserService service;
+  private final UsersForTpSiteUserParams originalParams;
+  private final Response httpResponse;
+
+  private UsersForTpSiteUserResponse(
+      List<TpSiteUserUsersForTpSiteUserItem> list,
+      String nextOffset,
+      String tpSiteUserDomain,
+      TpSiteUserService service,
+      UsersForTpSiteUserParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.tpSiteUserDomain = tpSiteUserDomain;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into UsersForTpSiteUserResponse object (no service context). Use this when
+   * you only need to read a single page (no nextPage()).
+   */
+  public static UsersForTpSiteUserResponse fromJson(String json) {
+    try {
+
+      List<TpSiteUserUsersForTpSiteUserItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(TpSiteUserUsersForTpSiteUserItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new UsersForTpSiteUserResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse UsersForTpSiteUserResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into UsersForTpSiteUserResponse object with service context for pagination
+   * (enables nextPage()).
+   */
+  public static UsersForTpSiteUserResponse fromJson(
+      String json,
+      TpSiteUserService service,
+      UsersForTpSiteUserParams originalParams,
+      String tpSiteUserDomain,
+      Response httpResponse) {
+    try {
+
+      List<TpSiteUserUsersForTpSiteUserItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(TpSiteUserUsersForTpSiteUserItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new UsersForTpSiteUserResponse(
+          list, nextOffset, tpSiteUserDomain, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse UsersForTpSiteUserResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<TpSiteUserUsersForTpSiteUserItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public UsersForTpSiteUserResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    UsersForTpSiteUserParams nextParams =
+        (originalParams != null ? originalParams.toBuilder() : UsersForTpSiteUserParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.usersForTpSiteUser(tpSiteUserDomain, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class TpSiteUserUsersForTpSiteUserItem {
+
+    private TpSiteUser tpSiteUser;
+
+    public TpSiteUser getTpSiteUser() {
+      return tpSiteUser;
+    }
+
+    public static TpSiteUserUsersForTpSiteUserItem fromJson(String json) {
+      TpSiteUserUsersForTpSiteUserItem item = new TpSiteUserUsersForTpSiteUserItem();
+
+      String __tpSiteUserJson = JsonUtil.getObject(json, "tp_site_user");
+      if (__tpSiteUserJson != null) {
+        item.tpSiteUser = TpSiteUser.fromJson(__tpSiteUserJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/transaction/Transaction.java b/src/main/java/com/chargebee/v4/models/transaction/Transaction.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/transaction/Transaction.java
rename to src/main/java/com/chargebee/v4/models/transaction/Transaction.java
index 4ce96396..f68e2db6 100644
--- a/src/main/java/com/chargebee/v4/core/models/transaction/Transaction.java
+++ b/src/main/java/com/chargebee/v4/models/transaction/Transaction.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.transaction;
+package com.chargebee.v4.models.transaction;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.math.BigDecimal;
@@ -316,6 +316,16 @@ public enum PaymentMethod {
 
     PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
 
+    ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+    KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+    PAY_BY_BANK("pay_by_bank"),
+
+    TRUSTLY("trustly"),
+
+    STABLECOIN("stablecoin"),
+
     /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
     _UNKNOWN(null);
     private final String value;
@@ -450,6 +460,8 @@ public enum Gateway {
 
     DEUTSCHE_BANK("deutsche_bank"),
 
+    EZIDEBIT("ezidebit"),
+
     NOT_APPLICABLE("not_applicable"),
 
     /** An enum member indicating that Gateway was instantiated with an unknown value. */
diff --git a/src/main/java/com/chargebee/v4/models/transaction/params/DeleteOfflineTransactionParams.java b/src/main/java/com/chargebee/v4/models/transaction/params/DeleteOfflineTransactionParams.java
new file mode 100644
index 00000000..a8418299
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/params/DeleteOfflineTransactionParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.transaction.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class DeleteOfflineTransactionParams {
+
+  private final String comment;
+
+  private DeleteOfflineTransactionParams(DeleteOfflineTransactionBuilder builder) {
+
+    this.comment = builder.comment;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for DeleteOfflineTransactionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static DeleteOfflineTransactionBuilder builder() {
+    return new DeleteOfflineTransactionBuilder();
+  }
+
+  public static final class DeleteOfflineTransactionBuilder {
+
+    private String comment;
+
+    private DeleteOfflineTransactionBuilder() {}
+
+    public DeleteOfflineTransactionBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public DeleteOfflineTransactionParams build() {
+      return new DeleteOfflineTransactionParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/transaction/params/SyncTransactionParams.java b/src/main/java/com/chargebee/v4/models/transaction/params/SyncTransactionParams.java
new file mode 100644
index 00000000..0a254ebb
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/params/SyncTransactionParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.transaction.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class SyncTransactionParams {
+
+  private SyncTransactionParams(SyncTransactionBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for SyncTransactionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static SyncTransactionBuilder builder() {
+    return new SyncTransactionBuilder();
+  }
+
+  public static final class SyncTransactionBuilder {
+
+    private SyncTransactionBuilder() {}
+
+    public SyncTransactionParams build() {
+      return new SyncTransactionParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/transaction/params/TransactionCreateAuthorizationParams.java b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionCreateAuthorizationParams.java
new file mode 100644
index 00000000..7a9acac7
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionCreateAuthorizationParams.java
@@ -0,0 +1,120 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.transaction.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class TransactionCreateAuthorizationParams {
+
+  private final String customerId;
+
+  private final String paymentSourceId;
+
+  private final String currencyCode;
+
+  private final Long amount;
+
+  private TransactionCreateAuthorizationParams(TransactionCreateAuthorizationBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.paymentSourceId = builder.paymentSourceId;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.amount = builder.amount;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getPaymentSourceId() {
+    return paymentSourceId;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.paymentSourceId != null) {
+
+      formData.put("payment_source_id", this.paymentSourceId);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for TransactionCreateAuthorizationParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static TransactionCreateAuthorizationBuilder builder() {
+    return new TransactionCreateAuthorizationBuilder();
+  }
+
+  public static final class TransactionCreateAuthorizationBuilder {
+
+    private String customerId;
+
+    private String paymentSourceId;
+
+    private String currencyCode;
+
+    private Long amount;
+
+    private TransactionCreateAuthorizationBuilder() {}
+
+    public TransactionCreateAuthorizationBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public TransactionCreateAuthorizationBuilder paymentSourceId(String value) {
+      this.paymentSourceId = value;
+      return this;
+    }
+
+    public TransactionCreateAuthorizationBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public TransactionCreateAuthorizationBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public TransactionCreateAuthorizationParams build() {
+      return new TransactionCreateAuthorizationParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionListParams.java b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionListParams.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionListParams.java
rename to src/main/java/com/chargebee/v4/models/transaction/params/TransactionListParams.java
index 82b9ad3e..80eecd61 100644
--- a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionListParams.java
+++ b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.transaction.params;
+package com.chargebee.v4.models.transaction.params;
 
 import com.chargebee.v4.internal.Recommended;
 
@@ -814,6 +814,16 @@ public enum PaymentMethodIs {
 
     PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
 
+    ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+    KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+    PAY_BY_BANK("pay_by_bank"),
+
+    TRUSTLY("trustly"),
+
+    STABLECOIN("stablecoin"),
+
     /** An enum member indicating that PaymentMethodIs was instantiated with an unknown value. */
     _UNKNOWN(null);
     private final String value;
@@ -908,6 +918,16 @@ public enum PaymentMethodIsNot {
 
     PAYCONIQ_BY_BANCONTACT("payconiq_by_bancontact"),
 
+    ELECTRONIC_PAYMENT_STANDARD("electronic_payment_standard"),
+
+    KBC_PAYMENT_BUTTON("kbc_payment_button"),
+
+    PAY_BY_BANK("pay_by_bank"),
+
+    TRUSTLY("trustly"),
+
+    STABLECOIN("stablecoin"),
+
     /** An enum member indicating that PaymentMethodIsNot was instantiated with an unknown value. */
     _UNKNOWN(null);
     private final String value;
@@ -1042,6 +1062,8 @@ public enum GatewayIs {
 
     DEUTSCHE_BANK("deutsche_bank"),
 
+    EZIDEBIT("ezidebit"),
+
     NOT_APPLICABLE("not_applicable"),
 
     /** An enum member indicating that GatewayIs was instantiated with an unknown value. */
@@ -1178,6 +1200,8 @@ public enum GatewayIsNot {
 
     DEUTSCHE_BANK("deutsche_bank"),
 
+    EZIDEBIT("ezidebit"),
+
     NOT_APPLICABLE("not_applicable"),
 
     /** An enum member indicating that GatewayIsNot was instantiated with an unknown value. */
diff --git a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionPaymentsForInvoiceParams.java b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionPaymentsForInvoiceParams.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionPaymentsForInvoiceParams.java
rename to src/main/java/com/chargebee/v4/models/transaction/params/TransactionPaymentsForInvoiceParams.java
index 1becc6f3..dd8b407e 100644
--- a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionPaymentsForInvoiceParams.java
+++ b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionPaymentsForInvoiceParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.transaction.params;
+package com.chargebee.v4.models.transaction.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/transaction/params/TransactionReconcileParams.java b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionReconcileParams.java
new file mode 100644
index 00000000..4fcfe608
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionReconcileParams.java
@@ -0,0 +1,128 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.transaction.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class TransactionReconcileParams {
+
+  private final String idAtGateway;
+
+  private final String customerId;
+
+  private final Status status;
+
+  private TransactionReconcileParams(TransactionReconcileBuilder builder) {
+
+    this.idAtGateway = builder.idAtGateway;
+
+    this.customerId = builder.customerId;
+
+    this.status = builder.status;
+  }
+
+  public String getIdAtGateway() {
+    return idAtGateway;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.idAtGateway != null) {
+
+      formData.put("id_at_gateway", this.idAtGateway);
+    }
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for TransactionReconcileParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static TransactionReconcileBuilder builder() {
+    return new TransactionReconcileBuilder();
+  }
+
+  public static final class TransactionReconcileBuilder {
+
+    private String idAtGateway;
+
+    private String customerId;
+
+    private Status status;
+
+    private TransactionReconcileBuilder() {}
+
+    public TransactionReconcileBuilder idAtGateway(String value) {
+      this.idAtGateway = value;
+      return this;
+    }
+
+    public TransactionReconcileBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public TransactionReconcileBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public TransactionReconcileParams build() {
+      return new TransactionReconcileParams(this);
+    }
+  }
+
+  public enum Status {
+    SUCCESS("success"),
+
+    FAILURE("failure"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/transaction/params/TransactionRecordRefundParams.java b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionRecordRefundParams.java
new file mode 100644
index 00000000..73d6690f
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionRecordRefundParams.java
@@ -0,0 +1,201 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.transaction.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class TransactionRecordRefundParams {
+
+  private final Long amount;
+
+  private final PaymentMethod paymentMethod;
+
+  private final Timestamp date;
+
+  private final String referenceNumber;
+
+  private final String customPaymentMethodId;
+
+  private final String comment;
+
+  private TransactionRecordRefundParams(TransactionRecordRefundBuilder builder) {
+
+    this.amount = builder.amount;
+
+    this.paymentMethod = builder.paymentMethod;
+
+    this.date = builder.date;
+
+    this.referenceNumber = builder.referenceNumber;
+
+    this.customPaymentMethodId = builder.customPaymentMethodId;
+
+    this.comment = builder.comment;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public PaymentMethod getPaymentMethod() {
+    return paymentMethod;
+  }
+
+  public Timestamp getDate() {
+    return date;
+  }
+
+  public String getReferenceNumber() {
+    return referenceNumber;
+  }
+
+  public String getCustomPaymentMethodId() {
+    return customPaymentMethodId;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.paymentMethod != null) {
+
+      formData.put("payment_method", this.paymentMethod);
+    }
+
+    if (this.date != null) {
+
+      formData.put("date", this.date);
+    }
+
+    if (this.referenceNumber != null) {
+
+      formData.put("reference_number", this.referenceNumber);
+    }
+
+    if (this.customPaymentMethodId != null) {
+
+      formData.put("custom_payment_method_id", this.customPaymentMethodId);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for TransactionRecordRefundParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static TransactionRecordRefundBuilder builder() {
+    return new TransactionRecordRefundBuilder();
+  }
+
+  public static final class TransactionRecordRefundBuilder {
+
+    private Long amount;
+
+    private PaymentMethod paymentMethod;
+
+    private Timestamp date;
+
+    private String referenceNumber;
+
+    private String customPaymentMethodId;
+
+    private String comment;
+
+    private TransactionRecordRefundBuilder() {}
+
+    public TransactionRecordRefundBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public TransactionRecordRefundBuilder paymentMethod(PaymentMethod value) {
+      this.paymentMethod = value;
+      return this;
+    }
+
+    public TransactionRecordRefundBuilder date(Timestamp value) {
+      this.date = value;
+      return this;
+    }
+
+    public TransactionRecordRefundBuilder referenceNumber(String value) {
+      this.referenceNumber = value;
+      return this;
+    }
+
+    public TransactionRecordRefundBuilder customPaymentMethodId(String value) {
+      this.customPaymentMethodId = value;
+      return this;
+    }
+
+    public TransactionRecordRefundBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public TransactionRecordRefundParams build() {
+      return new TransactionRecordRefundParams(this);
+    }
+  }
+
+  public enum PaymentMethod {
+    CASH("cash"),
+
+    CHECK("check"),
+
+    CHARGEBACK("chargeback"),
+
+    BANK_TRANSFER("bank_transfer"),
+
+    OTHER("other"),
+
+    APP_STORE("app_store"),
+
+    PLAY_STORE("play_store"),
+
+    CUSTOM("custom"),
+
+    /** An enum member indicating that PaymentMethod was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    PaymentMethod(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static PaymentMethod fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (PaymentMethod enumValue : PaymentMethod.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/transaction/params/TransactionRefundParams.java b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionRefundParams.java
new file mode 100644
index 00000000..d35f13a7
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionRefundParams.java
@@ -0,0 +1,80 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.transaction.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class TransactionRefundParams {
+
+  private final Long amount;
+
+  private final String comment;
+
+  private TransactionRefundParams(TransactionRefundBuilder builder) {
+
+    this.amount = builder.amount;
+
+    this.comment = builder.comment;
+  }
+
+  public Long getAmount() {
+    return amount;
+  }
+
+  public String getComment() {
+    return comment;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.amount != null) {
+
+      formData.put("amount", this.amount);
+    }
+
+    if (this.comment != null) {
+
+      formData.put("comment", this.comment);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for TransactionRefundParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static TransactionRefundBuilder builder() {
+    return new TransactionRefundBuilder();
+  }
+
+  public static final class TransactionRefundBuilder {
+
+    private Long amount;
+
+    private String comment;
+
+    private TransactionRefundBuilder() {}
+
+    public TransactionRefundBuilder amount(Long value) {
+      this.amount = value;
+      return this;
+    }
+
+    public TransactionRefundBuilder comment(String value) {
+      this.comment = value;
+      return this;
+    }
+
+    public TransactionRefundParams build() {
+      return new TransactionRefundParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionRetrieveParams.java b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/transaction/params/TransactionRetrieveParams.java
index 8e14af54..b4260a89 100644
--- a/src/main/java/com/chargebee/v4/core/models/transaction/params/TransactionRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.transaction.params;
+package com.chargebee.v4.models.transaction.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/transaction/params/TransactionsForCustomerParams.java b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionsForCustomerParams.java
new file mode 100644
index 00000000..348c99b9
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionsForCustomerParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.transaction.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class TransactionsForCustomerParams {
+
+  private final Map<String, Object> queryParams;
+
+  private TransactionsForCustomerParams(TransactionsForCustomerBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public TransactionsForCustomerBuilder toBuilder() {
+    TransactionsForCustomerBuilder builder = new TransactionsForCustomerBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for TransactionsForCustomerParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static TransactionsForCustomerBuilder builder() {
+    return new TransactionsForCustomerBuilder();
+  }
+
+  public static final class TransactionsForCustomerBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private TransactionsForCustomerBuilder() {}
+
+    public TransactionsForCustomerBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public TransactionsForCustomerBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public TransactionsForCustomerParams build() {
+      return new TransactionsForCustomerParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/transaction/params/TransactionsForSubscriptionParams.java b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionsForSubscriptionParams.java
new file mode 100644
index 00000000..77b18131
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/params/TransactionsForSubscriptionParams.java
@@ -0,0 +1,60 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.transaction.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class TransactionsForSubscriptionParams {
+
+  private final Map<String, Object> queryParams;
+
+  private TransactionsForSubscriptionParams(TransactionsForSubscriptionBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public TransactionsForSubscriptionBuilder toBuilder() {
+    TransactionsForSubscriptionBuilder builder = new TransactionsForSubscriptionBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for TransactionsForSubscriptionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static TransactionsForSubscriptionBuilder builder() {
+    return new TransactionsForSubscriptionBuilder();
+  }
+
+  public static final class TransactionsForSubscriptionBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private TransactionsForSubscriptionBuilder() {}
+
+    public TransactionsForSubscriptionBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public TransactionsForSubscriptionBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public TransactionsForSubscriptionParams build() {
+      return new TransactionsForSubscriptionParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/transaction/params/VoidTransactionParams.java b/src/main/java/com/chargebee/v4/models/transaction/params/VoidTransactionParams.java
new file mode 100644
index 00000000..d1809839
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/params/VoidTransactionParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.transaction.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class VoidTransactionParams {
+
+  private VoidTransactionParams(VoidTransactionBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for VoidTransactionParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static VoidTransactionBuilder builder() {
+    return new VoidTransactionBuilder();
+  }
+
+  public static final class VoidTransactionBuilder {
+
+    private VoidTransactionBuilder() {}
+
+    public VoidTransactionParams build() {
+      return new VoidTransactionParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/transaction/responses/DeleteOfflineTransactionResponse.java b/src/main/java/com/chargebee/v4/models/transaction/responses/DeleteOfflineTransactionResponse.java
new file mode 100644
index 00000000..4681b5bd
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/responses/DeleteOfflineTransactionResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.transaction.responses;
+
+import com.chargebee.v4.models.transaction.Transaction;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for DeleteOfflineTransaction operation. Contains the response data from
+ * the API.
+ */
+public final class DeleteOfflineTransactionResponse extends BaseResponse {
+  private final Transaction transaction;
+
+  private DeleteOfflineTransactionResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.transaction = builder.transaction;
+  }
+
+  /** Parse JSON response into DeleteOfflineTransactionResponse object. */
+  public static DeleteOfflineTransactionResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into DeleteOfflineTransactionResponse object with HTTP response. */
+  public static DeleteOfflineTransactionResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __transactionJson = JsonUtil.getObject(json, "transaction");
+      if (__transactionJson != null) {
+        builder.transaction(Transaction.fromJson(__transactionJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse DeleteOfflineTransactionResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for DeleteOfflineTransactionResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for DeleteOfflineTransactionResponse. */
+  public static class Builder {
+
+    private Transaction transaction;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder transaction(Transaction transaction) {
+      this.transaction = transaction;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public DeleteOfflineTransactionResponse build() {
+      return new DeleteOfflineTransactionResponse(this);
+    }
+  }
+
+  /** Get the transaction from the response. */
+  public Transaction getTransaction() {
+    return transaction;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/transaction/responses/SyncTransactionResponse.java b/src/main/java/com/chargebee/v4/models/transaction/responses/SyncTransactionResponse.java
new file mode 100644
index 00000000..c251bf61
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/responses/SyncTransactionResponse.java
@@ -0,0 +1,76 @@
+package com.chargebee.v4.models.transaction.responses;
+
+import com.chargebee.v4.models.transaction.Transaction;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for SyncTransaction operation. Contains the response data from the API.
+ */
+public final class SyncTransactionResponse extends BaseResponse {
+  private final Transaction transaction;
+
+  private SyncTransactionResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.transaction = builder.transaction;
+  }
+
+  /** Parse JSON response into SyncTransactionResponse object. */
+  public static SyncTransactionResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into SyncTransactionResponse object with HTTP response. */
+  public static SyncTransactionResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __transactionJson = JsonUtil.getObject(json, "transaction");
+      if (__transactionJson != null) {
+        builder.transaction(Transaction.fromJson(__transactionJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse SyncTransactionResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for SyncTransactionResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for SyncTransactionResponse. */
+  public static class Builder {
+
+    private Transaction transaction;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder transaction(Transaction transaction) {
+      this.transaction = transaction;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public SyncTransactionResponse build() {
+      return new SyncTransactionResponse(this);
+    }
+  }
+
+  /** Get the transaction from the response. */
+  public Transaction getTransaction() {
+    return transaction;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionCreateAuthorizationResponse.java b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionCreateAuthorizationResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/transaction/TransactionCreateAuthorizationResponse.java
rename to src/main/java/com/chargebee/v4/models/transaction/responses/TransactionCreateAuthorizationResponse.java
index 0f48d79b..f9dc9311 100644
--- a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionCreateAuthorizationResponse.java
+++ b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionCreateAuthorizationResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.transaction;
+package com.chargebee.v4.models.transaction.responses;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionListResponse.java b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/transaction/TransactionListResponse.java
rename to src/main/java/com/chargebee/v4/models/transaction/responses/TransactionListResponse.java
index e14e77e1..2918150c 100644
--- a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.transaction;
+package com.chargebee.v4.models.transaction.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.TransactionService;
-import com.chargebee.v4.core.models.transaction.params.TransactionListParams;
+import com.chargebee.v4.services.TransactionService;
+import com.chargebee.v4.models.transaction.params.TransactionListParams;
 
 /** Immutable response object for TransactionList operation. Contains paginated list data. */
 public final class TransactionListResponse {
@@ -98,9 +99,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public TransactionListResponse nextPage() throws Exception {
+  public TransactionListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionPaymentsForInvoiceResponse.java b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionPaymentsForInvoiceResponse.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/responses/transaction/TransactionPaymentsForInvoiceResponse.java
rename to src/main/java/com/chargebee/v4/models/transaction/responses/TransactionPaymentsForInvoiceResponse.java
index 4f3ccf99..655917f5 100644
--- a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionPaymentsForInvoiceResponse.java
+++ b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionPaymentsForInvoiceResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.transaction;
+package com.chargebee.v4.models.transaction.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.TransactionService;
-import com.chargebee.v4.core.models.transaction.params.TransactionPaymentsForInvoiceParams;
+import com.chargebee.v4.services.TransactionService;
+import com.chargebee.v4.models.transaction.params.TransactionPaymentsForInvoiceParams;
 
 /**
  * Immutable response object for TransactionPaymentsForInvoice operation. Contains paginated list
@@ -110,9 +111,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public TransactionPaymentsForInvoiceResponse nextPage() throws Exception {
+  public TransactionPaymentsForInvoiceResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionReconcileResponse.java b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionReconcileResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/transaction/TransactionReconcileResponse.java
rename to src/main/java/com/chargebee/v4/models/transaction/responses/TransactionReconcileResponse.java
index 4dc3d0de..2a5dabf3 100644
--- a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionReconcileResponse.java
+++ b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionReconcileResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.transaction;
+package com.chargebee.v4.models.transaction.responses;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionRecordRefundResponse.java b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionRecordRefundResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/transaction/TransactionRecordRefundResponse.java
rename to src/main/java/com/chargebee/v4/models/transaction/responses/TransactionRecordRefundResponse.java
index 72f3bdac..8e4faa07 100644
--- a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionRecordRefundResponse.java
+++ b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionRecordRefundResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.transaction;
+package com.chargebee.v4.models.transaction.responses;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionRefundResponse.java b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionRefundResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/transaction/TransactionRefundResponse.java
rename to src/main/java/com/chargebee/v4/models/transaction/responses/TransactionRefundResponse.java
index 3aa39f7d..8e8b9792 100644
--- a/src/main/java/com/chargebee/v4/core/responses/transaction/TransactionRefundResponse.java
+++ b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionRefundResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.transaction;
+package com.chargebee.v4.models.transaction.responses;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionRetrieveResponse.java
new file mode 100644
index 00000000..2961c7c1
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.transaction.responses;
+
+import com.chargebee.v4.models.transaction.Transaction;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for TransactionRetrieve operation. Contains the response data from a
+ * single resource get operation.
+ */
+public final class TransactionRetrieveResponse extends BaseResponse {
+  private final Transaction transaction;
+
+  private TransactionRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.transaction = builder.transaction;
+  }
+
+  /** Parse JSON response into TransactionRetrieveResponse object. */
+  public static TransactionRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into TransactionRetrieveResponse object with HTTP response. */
+  public static TransactionRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __transactionJson = JsonUtil.getObject(json, "transaction");
+      if (__transactionJson != null) {
+        builder.transaction(Transaction.fromJson(__transactionJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse TransactionRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for TransactionRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for TransactionRetrieveResponse. */
+  public static class Builder {
+
+    private Transaction transaction;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder transaction(Transaction transaction) {
+      this.transaction = transaction;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public TransactionRetrieveResponse build() {
+      return new TransactionRetrieveResponse(this);
+    }
+  }
+
+  /** Get the transaction from the response. */
+  public Transaction getTransaction() {
+    return transaction;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionsForCustomerResponse.java b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionsForCustomerResponse.java
new file mode 100644
index 00000000..5f2c8651
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionsForCustomerResponse.java
@@ -0,0 +1,176 @@
+package com.chargebee.v4.models.transaction.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.transaction.Transaction;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.TransactionService;
+import com.chargebee.v4.models.transaction.params.TransactionsForCustomerParams;
+
+/**
+ * Immutable response object for TransactionsForCustomer operation. Contains paginated list data.
+ */
+public final class TransactionsForCustomerResponse {
+
+  private final List<TransactionTransactionsForCustomerItem> list;
+
+  private final String nextOffset;
+
+  private final String customerId;
+
+  private final TransactionService service;
+  private final TransactionsForCustomerParams originalParams;
+  private final Response httpResponse;
+
+  private TransactionsForCustomerResponse(
+      List<TransactionTransactionsForCustomerItem> list,
+      String nextOffset,
+      String customerId,
+      TransactionService service,
+      TransactionsForCustomerParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.customerId = customerId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into TransactionsForCustomerResponse object (no service context). Use this
+   * when you only need to read a single page (no nextPage()).
+   */
+  public static TransactionsForCustomerResponse fromJson(String json) {
+    try {
+
+      List<TransactionTransactionsForCustomerItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(TransactionTransactionsForCustomerItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new TransactionsForCustomerResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse TransactionsForCustomerResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into TransactionsForCustomerResponse object with service context for
+   * pagination (enables nextPage()).
+   */
+  public static TransactionsForCustomerResponse fromJson(
+      String json,
+      TransactionService service,
+      TransactionsForCustomerParams originalParams,
+      String customerId,
+      Response httpResponse) {
+    try {
+
+      List<TransactionTransactionsForCustomerItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(TransactionTransactionsForCustomerItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new TransactionsForCustomerResponse(
+          list, nextOffset, customerId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse TransactionsForCustomerResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<TransactionTransactionsForCustomerItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public TransactionsForCustomerResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    TransactionsForCustomerParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : TransactionsForCustomerParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.transactionsForCustomer(customerId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class TransactionTransactionsForCustomerItem {
+
+    private Transaction transaction;
+
+    public Transaction getTransaction() {
+      return transaction;
+    }
+
+    public static TransactionTransactionsForCustomerItem fromJson(String json) {
+      TransactionTransactionsForCustomerItem item = new TransactionTransactionsForCustomerItem();
+
+      String __transactionJson = JsonUtil.getObject(json, "transaction");
+      if (__transactionJson != null) {
+        item.transaction = Transaction.fromJson(__transactionJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionsForSubscriptionResponse.java b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionsForSubscriptionResponse.java
new file mode 100644
index 00000000..6607d906
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/responses/TransactionsForSubscriptionResponse.java
@@ -0,0 +1,180 @@
+package com.chargebee.v4.models.transaction.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.transaction.Transaction;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.TransactionService;
+import com.chargebee.v4.models.transaction.params.TransactionsForSubscriptionParams;
+
+/**
+ * Immutable response object for TransactionsForSubscription operation. Contains paginated list
+ * data.
+ */
+public final class TransactionsForSubscriptionResponse {
+
+  private final List<TransactionTransactionsForSubscriptionItem> list;
+
+  private final String nextOffset;
+
+  private final String subscriptionId;
+
+  private final TransactionService service;
+  private final TransactionsForSubscriptionParams originalParams;
+  private final Response httpResponse;
+
+  private TransactionsForSubscriptionResponse(
+      List<TransactionTransactionsForSubscriptionItem> list,
+      String nextOffset,
+      String subscriptionId,
+      TransactionService service,
+      TransactionsForSubscriptionParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.subscriptionId = subscriptionId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into TransactionsForSubscriptionResponse object (no service context). Use
+   * this when you only need to read a single page (no nextPage()).
+   */
+  public static TransactionsForSubscriptionResponse fromJson(String json) {
+    try {
+
+      List<TransactionTransactionsForSubscriptionItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(TransactionTransactionsForSubscriptionItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new TransactionsForSubscriptionResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse TransactionsForSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into TransactionsForSubscriptionResponse object with service context for
+   * pagination (enables nextPage()).
+   */
+  public static TransactionsForSubscriptionResponse fromJson(
+      String json,
+      TransactionService service,
+      TransactionsForSubscriptionParams originalParams,
+      String subscriptionId,
+      Response httpResponse) {
+    try {
+
+      List<TransactionTransactionsForSubscriptionItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(TransactionTransactionsForSubscriptionItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new TransactionsForSubscriptionResponse(
+          list, nextOffset, subscriptionId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse TransactionsForSubscriptionResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<TransactionTransactionsForSubscriptionItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public TransactionsForSubscriptionResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    TransactionsForSubscriptionParams nextParams =
+        (originalParams != null
+                ? originalParams.toBuilder()
+                : TransactionsForSubscriptionParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.transactionsForSubscription(subscriptionId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class TransactionTransactionsForSubscriptionItem {
+
+    private Transaction transaction;
+
+    public Transaction getTransaction() {
+      return transaction;
+    }
+
+    public static TransactionTransactionsForSubscriptionItem fromJson(String json) {
+      TransactionTransactionsForSubscriptionItem item =
+          new TransactionTransactionsForSubscriptionItem();
+
+      String __transactionJson = JsonUtil.getObject(json, "transaction");
+      if (__transactionJson != null) {
+        item.transaction = Transaction.fromJson(__transactionJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/transaction/responses/VoidTransactionResponse.java b/src/main/java/com/chargebee/v4/models/transaction/responses/VoidTransactionResponse.java
new file mode 100644
index 00000000..f7f86136
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/transaction/responses/VoidTransactionResponse.java
@@ -0,0 +1,76 @@
+package com.chargebee.v4.models.transaction.responses;
+
+import com.chargebee.v4.models.transaction.Transaction;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for VoidTransaction operation. Contains the response data from the API.
+ */
+public final class VoidTransactionResponse extends BaseResponse {
+  private final Transaction transaction;
+
+  private VoidTransactionResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.transaction = builder.transaction;
+  }
+
+  /** Parse JSON response into VoidTransactionResponse object. */
+  public static VoidTransactionResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into VoidTransactionResponse object with HTTP response. */
+  public static VoidTransactionResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __transactionJson = JsonUtil.getObject(json, "transaction");
+      if (__transactionJson != null) {
+        builder.transaction(Transaction.fromJson(__transactionJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse VoidTransactionResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for VoidTransactionResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for VoidTransactionResponse. */
+  public static class Builder {
+
+    private Transaction transaction;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder transaction(Transaction transaction) {
+      this.transaction = transaction;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public VoidTransactionResponse build() {
+      return new VoidTransactionResponse(this);
+    }
+  }
+
+  /** Get the transaction from the response. */
+  public Transaction getTransaction() {
+    return transaction;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/UnbilledCharge.java b/src/main/java/com/chargebee/v4/models/unbilledCharge/UnbilledCharge.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/unbilledCharge/UnbilledCharge.java
rename to src/main/java/com/chargebee/v4/models/unbilledCharge/UnbilledCharge.java
index ee507db2..ad2381d9 100644
--- a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/UnbilledCharge.java
+++ b/src/main/java/com/chargebee/v4/models/unbilledCharge/UnbilledCharge.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.unbilledCharge;
+package com.chargebee.v4.models.unbilledCharge;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/unbilledCharge/params/CreateUnbilledChargeParams.java b/src/main/java/com/chargebee/v4/models/unbilledCharge/params/CreateUnbilledChargeParams.java
new file mode 100644
index 00000000..64656b82
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/unbilledCharge/params/CreateUnbilledChargeParams.java
@@ -0,0 +1,748 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.unbilledCharge.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class CreateUnbilledChargeParams {
+
+  private final String subscriptionId;
+
+  private final String currencyCode;
+
+  private final List<AddonsParams> addons;
+
+  private final List<ChargesParams> charges;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private CreateUnbilledChargeParams(CreateUnbilledChargeBuilder builder) {
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.addons = builder.addons;
+
+    this.charges = builder.charges;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public List<AddonsParams> getAddons() {
+    return addons;
+  }
+
+  public List<ChargesParams> getCharges() {
+    return charges;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.addons != null) {
+
+      // List of objects
+      for (int i = 0; i < this.addons.size(); i++) {
+        AddonsParams item = this.addons.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "addons[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.charges != null) {
+
+      // List of objects
+      for (int i = 0; i < this.charges.size(); i++) {
+        ChargesParams item = this.charges.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CreateUnbilledChargeParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreateUnbilledChargeBuilder builder() {
+    return new CreateUnbilledChargeBuilder();
+  }
+
+  public static final class CreateUnbilledChargeBuilder {
+
+    private String subscriptionId;
+
+    private String currencyCode;
+
+    private List<AddonsParams> addons;
+
+    private List<ChargesParams> charges;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private CreateUnbilledChargeBuilder() {}
+
+    public CreateUnbilledChargeBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public CreateUnbilledChargeBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public CreateUnbilledChargeBuilder addons(List<AddonsParams> value) {
+      this.addons = value;
+      return this;
+    }
+
+    public CreateUnbilledChargeBuilder charges(List<ChargesParams> value) {
+      this.charges = value;
+      return this;
+    }
+
+    public CreateUnbilledChargeBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public CreateUnbilledChargeParams build() {
+      return new CreateUnbilledChargeParams(this);
+    }
+  }
+
+  public static final class AddonsParams {
+
+    private final String id;
+
+    private final Integer quantity;
+
+    private final Long unitPrice;
+
+    private final String quantityInDecimal;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private AddonsParams(AddonsBuilder builder) {
+
+      this.id = builder.id;
+
+      this.quantity = builder.quantity;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for AddonsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static AddonsBuilder builder() {
+      return new AddonsBuilder();
+    }
+
+    public static final class AddonsBuilder {
+
+      private String id;
+
+      private Integer quantity;
+
+      private Long unitPrice;
+
+      private String quantityInDecimal;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private AddonsBuilder() {}
+
+      public AddonsBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public AddonsBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public AddonsBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public AddonsBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public AddonsBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public AddonsParams build() {
+        return new AddonsParams(this);
+      }
+    }
+  }
+
+  public static final class ChargesParams {
+
+    private final Long amount;
+
+    private final String amountInDecimal;
+
+    private final String description;
+
+    private final Boolean taxable;
+
+    private final String taxProfileId;
+
+    private final String avalaraTaxCode;
+
+    private final String hsnCode;
+
+    private final String taxjarProductCode;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ChargesParams(ChargesBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.description = builder.description;
+
+      this.taxable = builder.taxable;
+
+      this.taxProfileId = builder.taxProfileId;
+
+      this.avalaraTaxCode = builder.avalaraTaxCode;
+
+      this.hsnCode = builder.hsnCode;
+
+      this.taxjarProductCode = builder.taxjarProductCode;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Boolean getTaxable() {
+      return taxable;
+    }
+
+    public String getTaxProfileId() {
+      return taxProfileId;
+    }
+
+    public String getAvalaraTaxCode() {
+      return avalaraTaxCode;
+    }
+
+    public String getHsnCode() {
+      return hsnCode;
+    }
+
+    public String getTaxjarProductCode() {
+      return taxjarProductCode;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.taxable != null) {
+
+        formData.put("taxable", this.taxable);
+      }
+
+      if (this.taxProfileId != null) {
+
+        formData.put("tax_profile_id", this.taxProfileId);
+      }
+
+      if (this.avalaraTaxCode != null) {
+
+        formData.put("avalara_tax_code", this.avalaraTaxCode);
+      }
+
+      if (this.hsnCode != null) {
+
+        formData.put("hsn_code", this.hsnCode);
+      }
+
+      if (this.taxjarProductCode != null) {
+
+        formData.put("taxjar_product_code", this.taxjarProductCode);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargesBuilder builder() {
+      return new ChargesBuilder();
+    }
+
+    public static final class ChargesBuilder {
+
+      private Long amount;
+
+      private String amountInDecimal;
+
+      private String description;
+
+      private Boolean taxable;
+
+      private String taxProfileId;
+
+      private String avalaraTaxCode;
+
+      private String hsnCode;
+
+      private String taxjarProductCode;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ChargesBuilder() {}
+
+      public ChargesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public ChargesBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public ChargesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public ChargesBuilder taxable(Boolean value) {
+        this.taxable = value;
+        return this;
+      }
+
+      public ChargesBuilder taxProfileId(String value) {
+        this.taxProfileId = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTaxCode(String value) {
+        this.avalaraTaxCode = value;
+        return this;
+      }
+
+      public ChargesBuilder hsnCode(String value) {
+        this.hsnCode = value;
+        return this;
+      }
+
+      public ChargesBuilder taxjarProductCode(String value) {
+        this.taxjarProductCode = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public ChargesBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ChargesBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ChargesParams build() {
+        return new ChargesParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/unbilledCharge/params/InvoiceUnbilledChargesParams.java b/src/main/java/com/chargebee/v4/models/unbilledCharge/params/InvoiceUnbilledChargesParams.java
new file mode 100644
index 00000000..f90efa5c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/unbilledCharge/params/InvoiceUnbilledChargesParams.java
@@ -0,0 +1,80 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.unbilledCharge.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class InvoiceUnbilledChargesParams {
+
+  private final String subscriptionId;
+
+  private final String customerId;
+
+  private InvoiceUnbilledChargesParams(InvoiceUnbilledChargesBuilder builder) {
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.customerId = builder.customerId;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for InvoiceUnbilledChargesParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static InvoiceUnbilledChargesBuilder builder() {
+    return new InvoiceUnbilledChargesBuilder();
+  }
+
+  public static final class InvoiceUnbilledChargesBuilder {
+
+    private String subscriptionId;
+
+    private String customerId;
+
+    private InvoiceUnbilledChargesBuilder() {}
+
+    public InvoiceUnbilledChargesBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public InvoiceUnbilledChargesBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public InvoiceUnbilledChargesParams build() {
+      return new InvoiceUnbilledChargesParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/unbilledCharge/params/UnbilledChargeCreateParams.java b/src/main/java/com/chargebee/v4/models/unbilledCharge/params/UnbilledChargeCreateParams.java
new file mode 100644
index 00000000..497d1151
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/unbilledCharge/params/UnbilledChargeCreateParams.java
@@ -0,0 +1,1016 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.unbilledCharge.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class UnbilledChargeCreateParams {
+
+  private final String subscriptionId;
+
+  private final String currencyCode;
+
+  private final List<ItemPricesParams> itemPrices;
+
+  private final List<ItemTiersParams> itemTiers;
+
+  private final List<ChargesParams> charges;
+
+  private final List<TaxProvidersFieldsParams> taxProvidersFields;
+
+  private UnbilledChargeCreateParams(UnbilledChargeCreateBuilder builder) {
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.currencyCode = builder.currencyCode;
+
+    this.itemPrices = builder.itemPrices;
+
+    this.itemTiers = builder.itemTiers;
+
+    this.charges = builder.charges;
+
+    this.taxProvidersFields = builder.taxProvidersFields;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getCurrencyCode() {
+    return currencyCode;
+  }
+
+  public List<ItemPricesParams> getItemPrices() {
+    return itemPrices;
+  }
+
+  public List<ItemTiersParams> getItemTiers() {
+    return itemTiers;
+  }
+
+  public List<ChargesParams> getCharges() {
+    return charges;
+  }
+
+  public List<TaxProvidersFieldsParams> getTaxProvidersFields() {
+    return taxProvidersFields;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.currencyCode != null) {
+
+      formData.put("currency_code", this.currencyCode);
+    }
+
+    if (this.itemPrices != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemPrices.size(); i++) {
+        ItemPricesParams item = this.itemPrices.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_prices[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.itemTiers != null) {
+
+      // List of objects
+      for (int i = 0; i < this.itemTiers.size(); i++) {
+        ItemTiersParams item = this.itemTiers.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "item_tiers[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.charges != null) {
+
+      // List of objects
+      for (int i = 0; i < this.charges.size(); i++) {
+        ChargesParams item = this.charges.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "charges[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    if (this.taxProvidersFields != null) {
+
+      // List of objects
+      for (int i = 0; i < this.taxProvidersFields.size(); i++) {
+        TaxProvidersFieldsParams item = this.taxProvidersFields.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "tax_providers_fields[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for UnbilledChargeCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UnbilledChargeCreateBuilder builder() {
+    return new UnbilledChargeCreateBuilder();
+  }
+
+  public static final class UnbilledChargeCreateBuilder {
+
+    private String subscriptionId;
+
+    private String currencyCode;
+
+    private List<ItemPricesParams> itemPrices;
+
+    private List<ItemTiersParams> itemTiers;
+
+    private List<ChargesParams> charges;
+
+    private List<TaxProvidersFieldsParams> taxProvidersFields;
+
+    private UnbilledChargeCreateBuilder() {}
+
+    public UnbilledChargeCreateBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public UnbilledChargeCreateBuilder currencyCode(String value) {
+      this.currencyCode = value;
+      return this;
+    }
+
+    public UnbilledChargeCreateBuilder itemPrices(List<ItemPricesParams> value) {
+      this.itemPrices = value;
+      return this;
+    }
+
+    public UnbilledChargeCreateBuilder itemTiers(List<ItemTiersParams> value) {
+      this.itemTiers = value;
+      return this;
+    }
+
+    public UnbilledChargeCreateBuilder charges(List<ChargesParams> value) {
+      this.charges = value;
+      return this;
+    }
+
+    public UnbilledChargeCreateBuilder taxProvidersFields(List<TaxProvidersFieldsParams> value) {
+      this.taxProvidersFields = value;
+      return this;
+    }
+
+    public UnbilledChargeCreateParams build() {
+      return new UnbilledChargeCreateParams(this);
+    }
+  }
+
+  public static final class ItemPricesParams {
+
+    private final String itemPriceId;
+
+    private final Integer quantity;
+
+    private final String quantityInDecimal;
+
+    private final Long unitPrice;
+
+    private final String unitPriceInDecimal;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ItemPricesParams(ItemPricesBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.quantity = builder.quantity;
+
+      this.quantityInDecimal = builder.quantityInDecimal;
+
+      this.unitPrice = builder.unitPrice;
+
+      this.unitPriceInDecimal = builder.unitPriceInDecimal;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getQuantity() {
+      return quantity;
+    }
+
+    public String getQuantityInDecimal() {
+      return quantityInDecimal;
+    }
+
+    public Long getUnitPrice() {
+      return unitPrice;
+    }
+
+    public String getUnitPriceInDecimal() {
+      return unitPriceInDecimal;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.quantity != null) {
+
+        formData.put("quantity", this.quantity);
+      }
+
+      if (this.quantityInDecimal != null) {
+
+        formData.put("quantity_in_decimal", this.quantityInDecimal);
+      }
+
+      if (this.unitPrice != null) {
+
+        formData.put("unit_price", this.unitPrice);
+      }
+
+      if (this.unitPriceInDecimal != null) {
+
+        formData.put("unit_price_in_decimal", this.unitPriceInDecimal);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemPricesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemPricesBuilder builder() {
+      return new ItemPricesBuilder();
+    }
+
+    public static final class ItemPricesBuilder {
+
+      private String itemPriceId;
+
+      private Integer quantity;
+
+      private String quantityInDecimal;
+
+      private Long unitPrice;
+
+      private String unitPriceInDecimal;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ItemPricesBuilder() {}
+
+      public ItemPricesBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemPricesBuilder quantity(Integer value) {
+        this.quantity = value;
+        return this;
+      }
+
+      public ItemPricesBuilder quantityInDecimal(String value) {
+        this.quantityInDecimal = value;
+        return this;
+      }
+
+      public ItemPricesBuilder unitPrice(Long value) {
+        this.unitPrice = value;
+        return this;
+      }
+
+      public ItemPricesBuilder unitPriceInDecimal(String value) {
+        this.unitPriceInDecimal = value;
+        return this;
+      }
+
+      public ItemPricesBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ItemPricesBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ItemPricesParams build() {
+        return new ItemPricesParams(this);
+      }
+    }
+  }
+
+  public static final class ItemTiersParams {
+
+    private final String itemPriceId;
+
+    private final Integer startingUnit;
+
+    private final Integer endingUnit;
+
+    private final Long price;
+
+    private final String startingUnitInDecimal;
+
+    private final String endingUnitInDecimal;
+
+    private final String priceInDecimal;
+
+    private final PricingType pricingType;
+
+    private final Integer packageSize;
+
+    private ItemTiersParams(ItemTiersBuilder builder) {
+
+      this.itemPriceId = builder.itemPriceId;
+
+      this.startingUnit = builder.startingUnit;
+
+      this.endingUnit = builder.endingUnit;
+
+      this.price = builder.price;
+
+      this.startingUnitInDecimal = builder.startingUnitInDecimal;
+
+      this.endingUnitInDecimal = builder.endingUnitInDecimal;
+
+      this.priceInDecimal = builder.priceInDecimal;
+
+      this.pricingType = builder.pricingType;
+
+      this.packageSize = builder.packageSize;
+    }
+
+    public String getItemPriceId() {
+      return itemPriceId;
+    }
+
+    public Integer getStartingUnit() {
+      return startingUnit;
+    }
+
+    public Integer getEndingUnit() {
+      return endingUnit;
+    }
+
+    public Long getPrice() {
+      return price;
+    }
+
+    public String getStartingUnitInDecimal() {
+      return startingUnitInDecimal;
+    }
+
+    public String getEndingUnitInDecimal() {
+      return endingUnitInDecimal;
+    }
+
+    public String getPriceInDecimal() {
+      return priceInDecimal;
+    }
+
+    public PricingType getPricingType() {
+      return pricingType;
+    }
+
+    public Integer getPackageSize() {
+      return packageSize;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.itemPriceId != null) {
+
+        formData.put("item_price_id", this.itemPriceId);
+      }
+
+      if (this.startingUnit != null) {
+
+        formData.put("starting_unit", this.startingUnit);
+      }
+
+      if (this.endingUnit != null) {
+
+        formData.put("ending_unit", this.endingUnit);
+      }
+
+      if (this.price != null) {
+
+        formData.put("price", this.price);
+      }
+
+      if (this.startingUnitInDecimal != null) {
+
+        formData.put("starting_unit_in_decimal", this.startingUnitInDecimal);
+      }
+
+      if (this.endingUnitInDecimal != null) {
+
+        formData.put("ending_unit_in_decimal", this.endingUnitInDecimal);
+      }
+
+      if (this.priceInDecimal != null) {
+
+        formData.put("price_in_decimal", this.priceInDecimal);
+      }
+
+      if (this.pricingType != null) {
+
+        formData.put("pricing_type", this.pricingType);
+      }
+
+      if (this.packageSize != null) {
+
+        formData.put("package_size", this.packageSize);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ItemTiersParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ItemTiersBuilder builder() {
+      return new ItemTiersBuilder();
+    }
+
+    public static final class ItemTiersBuilder {
+
+      private String itemPriceId;
+
+      private Integer startingUnit;
+
+      private Integer endingUnit;
+
+      private Long price;
+
+      private String startingUnitInDecimal;
+
+      private String endingUnitInDecimal;
+
+      private String priceInDecimal;
+
+      private PricingType pricingType;
+
+      private Integer packageSize;
+
+      private ItemTiersBuilder() {}
+
+      public ItemTiersBuilder itemPriceId(String value) {
+        this.itemPriceId = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnit(Integer value) {
+        this.startingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnit(Integer value) {
+        this.endingUnit = value;
+        return this;
+      }
+
+      public ItemTiersBuilder price(Long value) {
+        this.price = value;
+        return this;
+      }
+
+      public ItemTiersBuilder startingUnitInDecimal(String value) {
+        this.startingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder endingUnitInDecimal(String value) {
+        this.endingUnitInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder priceInDecimal(String value) {
+        this.priceInDecimal = value;
+        return this;
+      }
+
+      public ItemTiersBuilder pricingType(PricingType value) {
+        this.pricingType = value;
+        return this;
+      }
+
+      public ItemTiersBuilder packageSize(Integer value) {
+        this.packageSize = value;
+        return this;
+      }
+
+      public ItemTiersParams build() {
+        return new ItemTiersParams(this);
+      }
+    }
+
+    public enum PricingType {
+      PER_UNIT("per_unit"),
+
+      FLAT_FEE("flat_fee"),
+
+      PACKAGE("package"),
+
+      /** An enum member indicating that PricingType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      PricingType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static PricingType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (PricingType enumValue : PricingType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class ChargesParams {
+
+    private final Long amount;
+
+    private final String amountInDecimal;
+
+    private final String description;
+
+    private final Boolean taxable;
+
+    private final String taxProfileId;
+
+    private final String avalaraTaxCode;
+
+    private final String hsnCode;
+
+    private final String taxjarProductCode;
+
+    private final AvalaraSaleType avalaraSaleType;
+
+    private final Integer avalaraTransactionType;
+
+    private final Integer avalaraServiceType;
+
+    private final Timestamp dateFrom;
+
+    private final Timestamp dateTo;
+
+    private ChargesParams(ChargesBuilder builder) {
+
+      this.amount = builder.amount;
+
+      this.amountInDecimal = builder.amountInDecimal;
+
+      this.description = builder.description;
+
+      this.taxable = builder.taxable;
+
+      this.taxProfileId = builder.taxProfileId;
+
+      this.avalaraTaxCode = builder.avalaraTaxCode;
+
+      this.hsnCode = builder.hsnCode;
+
+      this.taxjarProductCode = builder.taxjarProductCode;
+
+      this.avalaraSaleType = builder.avalaraSaleType;
+
+      this.avalaraTransactionType = builder.avalaraTransactionType;
+
+      this.avalaraServiceType = builder.avalaraServiceType;
+
+      this.dateFrom = builder.dateFrom;
+
+      this.dateTo = builder.dateTo;
+    }
+
+    public Long getAmount() {
+      return amount;
+    }
+
+    public String getAmountInDecimal() {
+      return amountInDecimal;
+    }
+
+    public String getDescription() {
+      return description;
+    }
+
+    public Boolean getTaxable() {
+      return taxable;
+    }
+
+    public String getTaxProfileId() {
+      return taxProfileId;
+    }
+
+    public String getAvalaraTaxCode() {
+      return avalaraTaxCode;
+    }
+
+    public String getHsnCode() {
+      return hsnCode;
+    }
+
+    public String getTaxjarProductCode() {
+      return taxjarProductCode;
+    }
+
+    public AvalaraSaleType getAvalaraSaleType() {
+      return avalaraSaleType;
+    }
+
+    public Integer getAvalaraTransactionType() {
+      return avalaraTransactionType;
+    }
+
+    public Integer getAvalaraServiceType() {
+      return avalaraServiceType;
+    }
+
+    public Timestamp getDateFrom() {
+      return dateFrom;
+    }
+
+    public Timestamp getDateTo() {
+      return dateTo;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.amount != null) {
+
+        formData.put("amount", this.amount);
+      }
+
+      if (this.amountInDecimal != null) {
+
+        formData.put("amount_in_decimal", this.amountInDecimal);
+      }
+
+      if (this.description != null) {
+
+        formData.put("description", this.description);
+      }
+
+      if (this.taxable != null) {
+
+        formData.put("taxable", this.taxable);
+      }
+
+      if (this.taxProfileId != null) {
+
+        formData.put("tax_profile_id", this.taxProfileId);
+      }
+
+      if (this.avalaraTaxCode != null) {
+
+        formData.put("avalara_tax_code", this.avalaraTaxCode);
+      }
+
+      if (this.hsnCode != null) {
+
+        formData.put("hsn_code", this.hsnCode);
+      }
+
+      if (this.taxjarProductCode != null) {
+
+        formData.put("taxjar_product_code", this.taxjarProductCode);
+      }
+
+      if (this.avalaraSaleType != null) {
+
+        formData.put("avalara_sale_type", this.avalaraSaleType);
+      }
+
+      if (this.avalaraTransactionType != null) {
+
+        formData.put("avalara_transaction_type", this.avalaraTransactionType);
+      }
+
+      if (this.avalaraServiceType != null) {
+
+        formData.put("avalara_service_type", this.avalaraServiceType);
+      }
+
+      if (this.dateFrom != null) {
+
+        formData.put("date_from", this.dateFrom);
+      }
+
+      if (this.dateTo != null) {
+
+        formData.put("date_to", this.dateTo);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for ChargesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static ChargesBuilder builder() {
+      return new ChargesBuilder();
+    }
+
+    public static final class ChargesBuilder {
+
+      private Long amount;
+
+      private String amountInDecimal;
+
+      private String description;
+
+      private Boolean taxable;
+
+      private String taxProfileId;
+
+      private String avalaraTaxCode;
+
+      private String hsnCode;
+
+      private String taxjarProductCode;
+
+      private AvalaraSaleType avalaraSaleType;
+
+      private Integer avalaraTransactionType;
+
+      private Integer avalaraServiceType;
+
+      private Timestamp dateFrom;
+
+      private Timestamp dateTo;
+
+      private ChargesBuilder() {}
+
+      public ChargesBuilder amount(Long value) {
+        this.amount = value;
+        return this;
+      }
+
+      public ChargesBuilder amountInDecimal(String value) {
+        this.amountInDecimal = value;
+        return this;
+      }
+
+      public ChargesBuilder description(String value) {
+        this.description = value;
+        return this;
+      }
+
+      public ChargesBuilder taxable(Boolean value) {
+        this.taxable = value;
+        return this;
+      }
+
+      public ChargesBuilder taxProfileId(String value) {
+        this.taxProfileId = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTaxCode(String value) {
+        this.avalaraTaxCode = value;
+        return this;
+      }
+
+      public ChargesBuilder hsnCode(String value) {
+        this.hsnCode = value;
+        return this;
+      }
+
+      public ChargesBuilder taxjarProductCode(String value) {
+        this.taxjarProductCode = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraSaleType(AvalaraSaleType value) {
+        this.avalaraSaleType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraTransactionType(Integer value) {
+        this.avalaraTransactionType = value;
+        return this;
+      }
+
+      public ChargesBuilder avalaraServiceType(Integer value) {
+        this.avalaraServiceType = value;
+        return this;
+      }
+
+      public ChargesBuilder dateFrom(Timestamp value) {
+        this.dateFrom = value;
+        return this;
+      }
+
+      public ChargesBuilder dateTo(Timestamp value) {
+        this.dateTo = value;
+        return this;
+      }
+
+      public ChargesParams build() {
+        return new ChargesParams(this);
+      }
+    }
+
+    public enum AvalaraSaleType {
+      WHOLESALE("wholesale"),
+
+      RETAIL("retail"),
+
+      CONSUMED("consumed"),
+
+      VENDOR_USE("vendor_use"),
+
+      /** An enum member indicating that AvalaraSaleType was instantiated with an unknown value. */
+      _UNKNOWN(null);
+      private final String value;
+
+      AvalaraSaleType(String value) {
+        this.value = value;
+      }
+
+      public String getValue() {
+        return value;
+      }
+
+      public static AvalaraSaleType fromString(String value) {
+        if (value == null) return _UNKNOWN;
+        for (AvalaraSaleType enumValue : AvalaraSaleType.values()) {
+          if (enumValue.value != null && enumValue.value.equals(value)) {
+            return enumValue;
+          }
+        }
+        return _UNKNOWN;
+      }
+    }
+  }
+
+  public static final class TaxProvidersFieldsParams {
+
+    private final String providerName;
+
+    private final String fieldId;
+
+    private final String fieldValue;
+
+    private TaxProvidersFieldsParams(TaxProvidersFieldsBuilder builder) {
+
+      this.providerName = builder.providerName;
+
+      this.fieldId = builder.fieldId;
+
+      this.fieldValue = builder.fieldValue;
+    }
+
+    public String getProviderName() {
+      return providerName;
+    }
+
+    public String getFieldId() {
+      return fieldId;
+    }
+
+    public String getFieldValue() {
+      return fieldValue;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.providerName != null) {
+
+        formData.put("provider_name", this.providerName);
+      }
+
+      if (this.fieldId != null) {
+
+        formData.put("field_id", this.fieldId);
+      }
+
+      if (this.fieldValue != null) {
+
+        formData.put("field_value", this.fieldValue);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for TaxProvidersFieldsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static TaxProvidersFieldsBuilder builder() {
+      return new TaxProvidersFieldsBuilder();
+    }
+
+    public static final class TaxProvidersFieldsBuilder {
+
+      private String providerName;
+
+      private String fieldId;
+
+      private String fieldValue;
+
+      private TaxProvidersFieldsBuilder() {}
+
+      public TaxProvidersFieldsBuilder providerName(String value) {
+        this.providerName = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldId(String value) {
+        this.fieldId = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsBuilder fieldValue(String value) {
+        this.fieldValue = value;
+        return this;
+      }
+
+      public TaxProvidersFieldsParams build() {
+        return new TaxProvidersFieldsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeDeleteParams.java b/src/main/java/com/chargebee/v4/models/unbilledCharge/params/UnbilledChargeDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/unbilledCharge/params/UnbilledChargeDeleteParams.java
index 68789ccb..b2d4baf5 100644
--- a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/unbilledCharge/params/UnbilledChargeDeleteParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.unbilledCharge.params;
+package com.chargebee.v4.models.unbilledCharge.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class UnbilledChargeDeleteParams {
 
-  private final Map<String, Object> formData;
-
-  private UnbilledChargeDeleteParams(UnbilledChargeDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private UnbilledChargeDeleteParams(UnbilledChargeDeleteBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static UnbilledChargeDeleteBuilder builder() {
   }
 
   public static final class UnbilledChargeDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private UnbilledChargeDeleteBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/models/unbilledCharge/params/UnbilledChargeInvoiceNowEstimateParams.java b/src/main/java/com/chargebee/v4/models/unbilledCharge/params/UnbilledChargeInvoiceNowEstimateParams.java
new file mode 100644
index 00000000..123fe3ce
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/unbilledCharge/params/UnbilledChargeInvoiceNowEstimateParams.java
@@ -0,0 +1,80 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.unbilledCharge.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class UnbilledChargeInvoiceNowEstimateParams {
+
+  private final String subscriptionId;
+
+  private final String customerId;
+
+  private UnbilledChargeInvoiceNowEstimateParams(UnbilledChargeInvoiceNowEstimateBuilder builder) {
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.customerId = builder.customerId;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for UnbilledChargeInvoiceNowEstimateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UnbilledChargeInvoiceNowEstimateBuilder builder() {
+    return new UnbilledChargeInvoiceNowEstimateBuilder();
+  }
+
+  public static final class UnbilledChargeInvoiceNowEstimateBuilder {
+
+    private String subscriptionId;
+
+    private String customerId;
+
+    private UnbilledChargeInvoiceNowEstimateBuilder() {}
+
+    public UnbilledChargeInvoiceNowEstimateBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public UnbilledChargeInvoiceNowEstimateBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public UnbilledChargeInvoiceNowEstimateParams build() {
+      return new UnbilledChargeInvoiceNowEstimateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeListParams.java b/src/main/java/com/chargebee/v4/models/unbilledCharge/params/UnbilledChargeListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeListParams.java
rename to src/main/java/com/chargebee/v4/models/unbilledCharge/params/UnbilledChargeListParams.java
index c5dafca6..f9b2a5c7 100644
--- a/src/main/java/com/chargebee/v4/core/models/unbilledCharge/params/UnbilledChargeListParams.java
+++ b/src/main/java/com/chargebee/v4/models/unbilledCharge/params/UnbilledChargeListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.unbilledCharge.params;
+package com.chargebee.v4.models.unbilledCharge.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/CreateUnbilledChargeResponse.java b/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/CreateUnbilledChargeResponse.java
new file mode 100644
index 00000000..6e68308b
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/CreateUnbilledChargeResponse.java
@@ -0,0 +1,79 @@
+package com.chargebee.v4.models.unbilledCharge.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CreateUnbilledCharge operation. Contains the response data from the
+ * API.
+ */
+public final class CreateUnbilledChargeResponse extends BaseResponse {
+  private final List<UnbilledCharge> unbilledCharges;
+
+  private CreateUnbilledChargeResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.unbilledCharges = builder.unbilledCharges;
+  }
+
+  /** Parse JSON response into CreateUnbilledChargeResponse object. */
+  public static CreateUnbilledChargeResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CreateUnbilledChargeResponse object with HTTP response. */
+  public static CreateUnbilledChargeResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.unbilledCharges(
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "unbilled_charges")).stream()
+              .map(UnbilledCharge::fromJson)
+              .collect(java.util.stream.Collectors.toList()));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CreateUnbilledChargeResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CreateUnbilledChargeResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CreateUnbilledChargeResponse. */
+  public static class Builder {
+
+    private List<UnbilledCharge> unbilledCharges;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder unbilledCharges(List<UnbilledCharge> unbilledCharges) {
+      this.unbilledCharges = unbilledCharges;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CreateUnbilledChargeResponse build() {
+      return new CreateUnbilledChargeResponse(this);
+    }
+  }
+
+  /** Get the unbilledCharges from the response. */
+  public List<UnbilledCharge> getUnbilledCharges() {
+    return unbilledCharges;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/InvoiceUnbilledChargesResponse.java b/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/InvoiceUnbilledChargesResponse.java
new file mode 100644
index 00000000..30d41104
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/InvoiceUnbilledChargesResponse.java
@@ -0,0 +1,79 @@
+package com.chargebee.v4.models.unbilledCharge.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.invoice.Invoice;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for InvoiceUnbilledCharges operation. Contains the response data from
+ * the API.
+ */
+public final class InvoiceUnbilledChargesResponse extends BaseResponse {
+  private final List<Invoice> invoices;
+
+  private InvoiceUnbilledChargesResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.invoices = builder.invoices;
+  }
+
+  /** Parse JSON response into InvoiceUnbilledChargesResponse object. */
+  public static InvoiceUnbilledChargesResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into InvoiceUnbilledChargesResponse object with HTTP response. */
+  public static InvoiceUnbilledChargesResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.invoices(
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "invoices")).stream()
+              .map(Invoice::fromJson)
+              .collect(java.util.stream.Collectors.toList()));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse InvoiceUnbilledChargesResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for InvoiceUnbilledChargesResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for InvoiceUnbilledChargesResponse. */
+  public static class Builder {
+
+    private List<Invoice> invoices;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder invoices(List<Invoice> invoices) {
+      this.invoices = invoices;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public InvoiceUnbilledChargesResponse build() {
+      return new InvoiceUnbilledChargesResponse(this);
+    }
+  }
+
+  /** Get the invoices from the response. */
+  public List<Invoice> getInvoices() {
+    return invoices;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeCreateResponse.java b/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/UnbilledChargeCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/unbilledCharge/responses/UnbilledChargeCreateResponse.java
index a9174e05..50a31f7f 100644
--- a/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/UnbilledChargeCreateResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.unbilledCharge;
+package com.chargebee.v4.models.unbilledCharge.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeDeleteResponse.java b/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/UnbilledChargeDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/unbilledCharge/responses/UnbilledChargeDeleteResponse.java
index 3161665e..225b3e9f 100644
--- a/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/UnbilledChargeDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.unbilledCharge;
+package com.chargebee.v4.models.unbilledCharge.responses;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeInvoiceNowEstimateResponse.java b/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/UnbilledChargeInvoiceNowEstimateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeInvoiceNowEstimateResponse.java
rename to src/main/java/com/chargebee/v4/models/unbilledCharge/responses/UnbilledChargeInvoiceNowEstimateResponse.java
index 7c8f1ff6..0e97bf7a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeInvoiceNowEstimateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/UnbilledChargeInvoiceNowEstimateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.unbilledCharge;
+package com.chargebee.v4.models.unbilledCharge.responses;
 
-import com.chargebee.v4.core.models.estimate.Estimate;
+import com.chargebee.v4.models.estimate.Estimate;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeListResponse.java b/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/UnbilledChargeListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeListResponse.java
rename to src/main/java/com/chargebee/v4/models/unbilledCharge/responses/UnbilledChargeListResponse.java
index 27c86ce6..216dea96 100644
--- a/src/main/java/com/chargebee/v4/core/responses/unbilledCharge/UnbilledChargeListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/unbilledCharge/responses/UnbilledChargeListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.unbilledCharge;
+package com.chargebee.v4.models.unbilledCharge.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.unbilledCharge.UnbilledCharge;
+import com.chargebee.v4.models.unbilledCharge.UnbilledCharge;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.UnbilledChargeService;
-import com.chargebee.v4.core.models.unbilledCharge.params.UnbilledChargeListParams;
+import com.chargebee.v4.services.UnbilledChargeService;
+import com.chargebee.v4.models.unbilledCharge.params.UnbilledChargeListParams;
 
 /** Immutable response object for UnbilledChargeList operation. Contains paginated list data. */
 public final class UnbilledChargeListResponse {
@@ -99,9 +100,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public UnbilledChargeListResponse nextPage() throws Exception {
+  public UnbilledChargeListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/models/unbilledChargesSetting/params/UnbilledChargesSettingRetrieveParams.java b/src/main/java/com/chargebee/v4/models/unbilledChargesSetting/params/UnbilledChargesSettingRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/unbilledChargesSetting/params/UnbilledChargesSettingRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/unbilledChargesSetting/params/UnbilledChargesSettingRetrieveParams.java
index d561f6b4..6a584118 100644
--- a/src/main/java/com/chargebee/v4/core/models/unbilledChargesSetting/params/UnbilledChargesSettingRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/unbilledChargesSetting/params/UnbilledChargesSettingRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.unbilledChargesSetting.params;
+package com.chargebee.v4.models.unbilledChargesSetting.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/unbilledChargesSetting/responses/UnbilledChargesSettingRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/unbilledChargesSetting/responses/UnbilledChargesSettingRetrieveResponse.java
new file mode 100644
index 00000000..27652056
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/unbilledChargesSetting/responses/UnbilledChargesSettingRetrieveResponse.java
@@ -0,0 +1,74 @@
+package com.chargebee.v4.models.unbilledChargesSetting.responses;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for UnbilledChargesSettingRetrieve operation. Contains the response
+ * data from a single resource get operation.
+ */
+public final class UnbilledChargesSettingRetrieveResponse extends BaseResponse {
+  private final Object unbilledChargesSetting;
+
+  private UnbilledChargesSettingRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.unbilledChargesSetting = builder.unbilledChargesSetting;
+  }
+
+  /** Parse JSON response into UnbilledChargesSettingRetrieveResponse object. */
+  public static UnbilledChargesSettingRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into UnbilledChargesSettingRetrieveResponse object with HTTP response. */
+  public static UnbilledChargesSettingRetrieveResponse fromJson(
+      String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      builder.unbilledChargesSetting(JsonUtil.getObject(json, "unbilled_charges_setting"));
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException(
+          "Failed to parse UnbilledChargesSettingRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for UnbilledChargesSettingRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for UnbilledChargesSettingRetrieveResponse. */
+  public static class Builder {
+
+    private Object unbilledChargesSetting;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder unbilledChargesSetting(Object unbilledChargesSetting) {
+      this.unbilledChargesSetting = unbilledChargesSetting;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public UnbilledChargesSettingRetrieveResponse build() {
+      return new UnbilledChargesSettingRetrieveResponse(this);
+    }
+  }
+
+  /** Get the unbilledChargesSetting from the response. */
+  public Object getUnbilledChargesSetting() {
+    return unbilledChargesSetting;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/usage/Usage.java b/src/main/java/com/chargebee/v4/models/usage/Usage.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/usage/Usage.java
rename to src/main/java/com/chargebee/v4/models/usage/Usage.java
index bcc6c044..52c32d93 100644
--- a/src/main/java/com/chargebee/v4/core/models/usage/Usage.java
+++ b/src/main/java/com/chargebee/v4/models/usage/Usage.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.usage;
+package com.chargebee.v4.models.usage;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/usage/params/UsageCreateParams.java b/src/main/java/com/chargebee/v4/models/usage/params/UsageCreateParams.java
new file mode 100644
index 00000000..99ca7dc5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/usage/params/UsageCreateParams.java
@@ -0,0 +1,190 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.usage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.sql.Timestamp;
+
+public final class UsageCreateParams {
+
+  private final String id;
+
+  private final String itemPriceId;
+
+  private final String quantity;
+
+  private final Timestamp usageDate;
+
+  private final DedupeOption dedupeOption;
+
+  private final String note;
+
+  private UsageCreateParams(UsageCreateBuilder builder) {
+
+    this.id = builder.id;
+
+    this.itemPriceId = builder.itemPriceId;
+
+    this.quantity = builder.quantity;
+
+    this.usageDate = builder.usageDate;
+
+    this.dedupeOption = builder.dedupeOption;
+
+    this.note = builder.note;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getItemPriceId() {
+    return itemPriceId;
+  }
+
+  public String getQuantity() {
+    return quantity;
+  }
+
+  public Timestamp getUsageDate() {
+    return usageDate;
+  }
+
+  public DedupeOption getDedupeOption() {
+    return dedupeOption;
+  }
+
+  public String getNote() {
+    return note;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.itemPriceId != null) {
+
+      formData.put("item_price_id", this.itemPriceId);
+    }
+
+    if (this.quantity != null) {
+
+      formData.put("quantity", this.quantity);
+    }
+
+    if (this.usageDate != null) {
+
+      formData.put("usage_date", this.usageDate);
+    }
+
+    if (this.dedupeOption != null) {
+
+      formData.put("dedupe_option", this.dedupeOption);
+    }
+
+    if (this.note != null) {
+
+      formData.put("note", this.note);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for UsageCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UsageCreateBuilder builder() {
+    return new UsageCreateBuilder();
+  }
+
+  public static final class UsageCreateBuilder {
+
+    private String id;
+
+    private String itemPriceId;
+
+    private String quantity;
+
+    private Timestamp usageDate;
+
+    private DedupeOption dedupeOption;
+
+    private String note;
+
+    private UsageCreateBuilder() {}
+
+    public UsageCreateBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public UsageCreateBuilder itemPriceId(String value) {
+      this.itemPriceId = value;
+      return this;
+    }
+
+    public UsageCreateBuilder quantity(String value) {
+      this.quantity = value;
+      return this;
+    }
+
+    public UsageCreateBuilder usageDate(Timestamp value) {
+      this.usageDate = value;
+      return this;
+    }
+
+    @Deprecated
+    public UsageCreateBuilder dedupeOption(DedupeOption value) {
+      this.dedupeOption = value;
+      return this;
+    }
+
+    public UsageCreateBuilder note(String value) {
+      this.note = value;
+      return this;
+    }
+
+    public UsageCreateParams build() {
+      return new UsageCreateParams(this);
+    }
+  }
+
+  public enum DedupeOption {
+    SKIP("skip"),
+
+    UPDATE_EXISTING("update_existing"),
+
+    /** An enum member indicating that DedupeOption was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    DedupeOption(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static DedupeOption fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (DedupeOption enumValue : DedupeOption.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/usage/params/UsageDeleteParams.java b/src/main/java/com/chargebee/v4/models/usage/params/UsageDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/usage/params/UsageDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/usage/params/UsageDeleteParams.java
index 7c254c62..97f847a5 100644
--- a/src/main/java/com/chargebee/v4/core/models/usage/params/UsageDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/usage/params/UsageDeleteParams.java
@@ -4,24 +4,35 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.usage.params;
+package com.chargebee.v4.models.usage.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class UsageDeleteParams {
 
-  private final Map<String, Object> formData;
+  private final String id;
 
   private UsageDeleteParams(UsageDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
+
+    this.id = builder.id;
+  }
+
+  public String getId() {
+    return id;
   }
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
     return formData;
   }
 
@@ -32,14 +43,13 @@ public static UsageDeleteBuilder builder() {
   }
 
   public static final class UsageDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
+
+    private String id;
 
     private UsageDeleteBuilder() {}
 
     public UsageDeleteBuilder id(String value) {
-
-      formData.put("id", value);
-
+      this.id = value;
       return this;
     }
 
diff --git a/src/main/java/com/chargebee/v4/core/models/usage/params/UsageListParams.java b/src/main/java/com/chargebee/v4/models/usage/params/UsageListParams.java
similarity index 99%
rename from src/main/java/com/chargebee/v4/core/models/usage/params/UsageListParams.java
rename to src/main/java/com/chargebee/v4/models/usage/params/UsageListParams.java
index 1bcbd550..8f051190 100644
--- a/src/main/java/com/chargebee/v4/core/models/usage/params/UsageListParams.java
+++ b/src/main/java/com/chargebee/v4/models/usage/params/UsageListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.usage.params;
+package com.chargebee.v4.models.usage.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/usage/params/UsagePdfParams.java b/src/main/java/com/chargebee/v4/models/usage/params/UsagePdfParams.java
new file mode 100644
index 00000000..5df037c6
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/usage/params/UsagePdfParams.java
@@ -0,0 +1,161 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.usage.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class UsagePdfParams {
+
+  private final DispositionType dispositionType;
+
+  private final InvoiceParams invoice;
+
+  private UsagePdfParams(UsagePdfBuilder builder) {
+
+    this.dispositionType = builder.dispositionType;
+
+    this.invoice = builder.invoice;
+  }
+
+  public DispositionType getDispositionType() {
+    return dispositionType;
+  }
+
+  public InvoiceParams getInvoice() {
+    return invoice;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.dispositionType != null) {
+
+      formData.put("disposition_type", this.dispositionType);
+    }
+
+    if (this.invoice != null) {
+
+      // Single object
+      Map<String, Object> nestedData = this.invoice.toFormData();
+      for (Map.Entry<String, Object> entry : nestedData.entrySet()) {
+        String nestedKey = "invoice[" + entry.getKey() + "]";
+        formData.put(nestedKey, entry.getValue());
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for UsagePdfParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UsagePdfBuilder builder() {
+    return new UsagePdfBuilder();
+  }
+
+  public static final class UsagePdfBuilder {
+
+    private DispositionType dispositionType;
+
+    private InvoiceParams invoice;
+
+    private UsagePdfBuilder() {}
+
+    public UsagePdfBuilder dispositionType(DispositionType value) {
+      this.dispositionType = value;
+      return this;
+    }
+
+    public UsagePdfBuilder invoice(InvoiceParams value) {
+      this.invoice = value;
+      return this;
+    }
+
+    public UsagePdfParams build() {
+      return new UsagePdfParams(this);
+    }
+  }
+
+  public enum DispositionType {
+    ATTACHMENT("attachment"),
+
+    INLINE("inline"),
+
+    /** An enum member indicating that DispositionType was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    DispositionType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static DispositionType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (DispositionType enumValue : DispositionType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class InvoiceParams {
+
+    private final String id;
+
+    private InvoiceParams(InvoiceBuilder builder) {
+
+      this.id = builder.id;
+    }
+
+    public String getId() {
+      return id;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.id != null) {
+
+        formData.put("id", this.id);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for InvoiceParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static InvoiceBuilder builder() {
+      return new InvoiceBuilder();
+    }
+
+    public static final class InvoiceBuilder {
+
+      private String id;
+
+      private InvoiceBuilder() {}
+
+      public InvoiceBuilder id(String value) {
+        this.id = value;
+        return this;
+      }
+
+      public InvoiceParams build() {
+        return new InvoiceParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/usage/params/UsageRetrieveParams.java b/src/main/java/com/chargebee/v4/models/usage/params/UsageRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/usage/params/UsageRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/usage/params/UsageRetrieveParams.java
index d7feab47..44f04222 100644
--- a/src/main/java/com/chargebee/v4/core/models/usage/params/UsageRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/usage/params/UsageRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.usage.params;
+package com.chargebee.v4.models.usage.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/usage/UsageCreateResponse.java b/src/main/java/com/chargebee/v4/models/usage/responses/UsageCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/usage/UsageCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/usage/responses/UsageCreateResponse.java
index e9468385..fe481c8b 100644
--- a/src/main/java/com/chargebee/v4/core/responses/usage/UsageCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/usage/responses/UsageCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.usage;
+package com.chargebee.v4.models.usage.responses;
 
-import com.chargebee.v4.core.models.usage.Usage;
+import com.chargebee.v4.models.usage.Usage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/usage/UsageDeleteResponse.java b/src/main/java/com/chargebee/v4/models/usage/responses/UsageDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/usage/UsageDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/usage/responses/UsageDeleteResponse.java
index e8d5294b..28818eb5 100644
--- a/src/main/java/com/chargebee/v4/core/responses/usage/UsageDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/usage/responses/UsageDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.usage;
+package com.chargebee.v4.models.usage.responses;
 
-import com.chargebee.v4.core.models.usage.Usage;
+import com.chargebee.v4.models.usage.Usage;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/usage/UsageListResponse.java b/src/main/java/com/chargebee/v4/models/usage/responses/UsageListResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/usage/UsageListResponse.java
rename to src/main/java/com/chargebee/v4/models/usage/responses/UsageListResponse.java
index 1f8c644d..b872fd12 100644
--- a/src/main/java/com/chargebee/v4/core/responses/usage/UsageListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/usage/responses/UsageListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.usage;
+package com.chargebee.v4.models.usage.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.usage.Usage;
+import com.chargebee.v4.models.usage.Usage;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.UsageService;
-import com.chargebee.v4.core.models.usage.params.UsageListParams;
+import com.chargebee.v4.services.UsageService;
+import com.chargebee.v4.models.usage.params.UsageListParams;
 
 /** Immutable response object for UsageList operation. Contains paginated list data. */
 public final class UsageListResponse {
@@ -95,9 +96,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public UsageListResponse nextPage() throws Exception {
+  public UsageListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/core/responses/usage/UsagePdfResponse.java b/src/main/java/com/chargebee/v4/models/usage/responses/UsagePdfResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/usage/UsagePdfResponse.java
rename to src/main/java/com/chargebee/v4/models/usage/responses/UsagePdfResponse.java
index 987534e9..148b39f7 100644
--- a/src/main/java/com/chargebee/v4/core/responses/usage/UsagePdfResponse.java
+++ b/src/main/java/com/chargebee/v4/models/usage/responses/UsagePdfResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.usage;
+package com.chargebee.v4.models.usage.responses;
 
-import com.chargebee.v4.core.models.download.Download;
+import com.chargebee.v4.models.download.Download;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/usage/responses/UsageRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/usage/responses/UsageRetrieveResponse.java
new file mode 100644
index 00000000..65103296
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/usage/responses/UsageRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.usage.responses;
+
+import com.chargebee.v4.models.usage.Usage;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for UsageRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class UsageRetrieveResponse extends BaseResponse {
+  private final Usage usage;
+
+  private UsageRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.usage = builder.usage;
+  }
+
+  /** Parse JSON response into UsageRetrieveResponse object. */
+  public static UsageRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into UsageRetrieveResponse object with HTTP response. */
+  public static UsageRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __usageJson = JsonUtil.getObject(json, "usage");
+      if (__usageJson != null) {
+        builder.usage(Usage.fromJson(__usageJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse UsageRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for UsageRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for UsageRetrieveResponse. */
+  public static class Builder {
+
+    private Usage usage;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder usage(Usage usage) {
+      this.usage = usage;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public UsageRetrieveResponse build() {
+      return new UsageRetrieveResponse(this);
+    }
+  }
+
+  /** Get the usage from the response. */
+  public Usage getUsage() {
+    return usage;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/usageEvent/UsageEvent.java b/src/main/java/com/chargebee/v4/models/usageEvent/UsageEvent.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/usageEvent/UsageEvent.java
rename to src/main/java/com/chargebee/v4/models/usageEvent/UsageEvent.java
index 23cc3999..10647be4 100644
--- a/src/main/java/com/chargebee/v4/core/models/usageEvent/UsageEvent.java
+++ b/src/main/java/com/chargebee/v4/models/usageEvent/UsageEvent.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.usageEvent;
+package com.chargebee.v4.models.usageEvent;
 
 import com.chargebee.v4.internal.JsonUtil;
 
diff --git a/src/main/java/com/chargebee/v4/models/usageEvent/params/UsageEventBatchIngestParams.java b/src/main/java/com/chargebee/v4/models/usageEvent/params/UsageEventBatchIngestParams.java
new file mode 100644
index 00000000..033255d1
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/usageEvent/params/UsageEventBatchIngestParams.java
@@ -0,0 +1,181 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.usageEvent.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+import java.sql.Timestamp;
+
+public final class UsageEventBatchIngestParams {
+
+  private final List<EventsParams> events;
+
+  private UsageEventBatchIngestParams(UsageEventBatchIngestBuilder builder) {
+
+    this.events = builder.events;
+  }
+
+  public List<EventsParams> getEvents() {
+    return events;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.events != null) {
+
+      // List of objects
+      for (int i = 0; i < this.events.size(); i++) {
+        EventsParams item = this.events.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "events[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for UsageEventBatchIngestParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UsageEventBatchIngestBuilder builder() {
+    return new UsageEventBatchIngestBuilder();
+  }
+
+  public static final class UsageEventBatchIngestBuilder {
+
+    private List<EventsParams> events;
+
+    private UsageEventBatchIngestBuilder() {}
+
+    public UsageEventBatchIngestBuilder events(List<EventsParams> value) {
+      this.events = value;
+      return this;
+    }
+
+    public UsageEventBatchIngestParams build() {
+      return new UsageEventBatchIngestParams(this);
+    }
+  }
+
+  public static final class EventsParams {
+
+    private final String deduplicationId;
+
+    private final String subscriptionId;
+
+    private final Timestamp usageTimestamp;
+
+    private final java.util.Map<String, Object> properties;
+
+    private EventsParams(EventsBuilder builder) {
+
+      this.deduplicationId = builder.deduplicationId;
+
+      this.subscriptionId = builder.subscriptionId;
+
+      this.usageTimestamp = builder.usageTimestamp;
+
+      this.properties = builder.properties;
+    }
+
+    public String getDeduplicationId() {
+      return deduplicationId;
+    }
+
+    public String getSubscriptionId() {
+      return subscriptionId;
+    }
+
+    public Timestamp getUsageTimestamp() {
+      return usageTimestamp;
+    }
+
+    public java.util.Map<String, Object> getProperties() {
+      return properties;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.deduplicationId != null) {
+
+        formData.put("deduplication_id", this.deduplicationId);
+      }
+
+      if (this.subscriptionId != null) {
+
+        formData.put("subscription_id", this.subscriptionId);
+      }
+
+      if (this.usageTimestamp != null) {
+
+        formData.put("usage_timestamp", this.usageTimestamp);
+      }
+
+      if (this.properties != null) {
+
+        formData.put("properties", JsonUtil.toJson(this.properties));
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for EventsParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static EventsBuilder builder() {
+      return new EventsBuilder();
+    }
+
+    public static final class EventsBuilder {
+
+      private String deduplicationId;
+
+      private String subscriptionId;
+
+      private Timestamp usageTimestamp;
+
+      private java.util.Map<String, Object> properties;
+
+      private EventsBuilder() {}
+
+      public EventsBuilder deduplicationId(String value) {
+        this.deduplicationId = value;
+        return this;
+      }
+
+      public EventsBuilder subscriptionId(String value) {
+        this.subscriptionId = value;
+        return this;
+      }
+
+      public EventsBuilder usageTimestamp(Timestamp value) {
+        this.usageTimestamp = value;
+        return this;
+      }
+
+      public EventsBuilder properties(java.util.Map<String, Object> value) {
+        this.properties = value;
+        return this;
+      }
+
+      public EventsParams build() {
+        return new EventsParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/usageEvent/params/UsageEventCreateParams.java b/src/main/java/com/chargebee/v4/models/usageEvent/params/UsageEventCreateParams.java
new file mode 100644
index 00000000..ad7c895a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/usageEvent/params/UsageEventCreateParams.java
@@ -0,0 +1,121 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.usageEvent.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class UsageEventCreateParams {
+
+  private final String deduplicationId;
+
+  private final String subscriptionId;
+
+  private final Long usageTimestamp;
+
+  private final java.util.Map<String, Object> properties;
+
+  private UsageEventCreateParams(UsageEventCreateBuilder builder) {
+
+    this.deduplicationId = builder.deduplicationId;
+
+    this.subscriptionId = builder.subscriptionId;
+
+    this.usageTimestamp = builder.usageTimestamp;
+
+    this.properties = builder.properties;
+  }
+
+  public String getDeduplicationId() {
+    return deduplicationId;
+  }
+
+  public String getSubscriptionId() {
+    return subscriptionId;
+  }
+
+  public Long getUsageTimestamp() {
+    return usageTimestamp;
+  }
+
+  public java.util.Map<String, Object> getProperties() {
+    return properties;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.deduplicationId != null) {
+
+      formData.put("deduplication_id", this.deduplicationId);
+    }
+
+    if (this.subscriptionId != null) {
+
+      formData.put("subscription_id", this.subscriptionId);
+    }
+
+    if (this.usageTimestamp != null) {
+
+      formData.put("usage_timestamp", this.usageTimestamp);
+    }
+
+    if (this.properties != null) {
+
+      formData.put("properties", JsonUtil.toJson(this.properties));
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for UsageEventCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UsageEventCreateBuilder builder() {
+    return new UsageEventCreateBuilder();
+  }
+
+  public static final class UsageEventCreateBuilder {
+
+    private String deduplicationId;
+
+    private String subscriptionId;
+
+    private Long usageTimestamp;
+
+    private java.util.Map<String, Object> properties;
+
+    private UsageEventCreateBuilder() {}
+
+    public UsageEventCreateBuilder deduplicationId(String value) {
+      this.deduplicationId = value;
+      return this;
+    }
+
+    public UsageEventCreateBuilder subscriptionId(String value) {
+      this.subscriptionId = value;
+      return this;
+    }
+
+    public UsageEventCreateBuilder usageTimestamp(Long value) {
+      this.usageTimestamp = value;
+      return this;
+    }
+
+    public UsageEventCreateBuilder properties(java.util.Map<String, Object> value) {
+      this.properties = value;
+      return this;
+    }
+
+    public UsageEventCreateParams build() {
+      return new UsageEventCreateParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/usageEvent/UsageEventBatchIngestResponse.java b/src/main/java/com/chargebee/v4/models/usageEvent/responses/UsageEventBatchIngestResponse.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/responses/usageEvent/UsageEventBatchIngestResponse.java
rename to src/main/java/com/chargebee/v4/models/usageEvent/responses/UsageEventBatchIngestResponse.java
index db497834..fd073344 100644
--- a/src/main/java/com/chargebee/v4/core/responses/usageEvent/UsageEventBatchIngestResponse.java
+++ b/src/main/java/com/chargebee/v4/models/usageEvent/responses/UsageEventBatchIngestResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.usageEvent;
+package com.chargebee.v4.models.usageEvent.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/usageEvent/UsageEventCreateResponse.java b/src/main/java/com/chargebee/v4/models/usageEvent/responses/UsageEventCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/usageEvent/UsageEventCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/usageEvent/responses/UsageEventCreateResponse.java
index 00f2af57..59d3a19a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/usageEvent/UsageEventCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/usageEvent/responses/UsageEventCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.usageEvent;
+package com.chargebee.v4.models.usageEvent.responses;
 
-import com.chargebee.v4.core.models.usageEvent.UsageEvent;
+import com.chargebee.v4.models.usageEvent.UsageEvent;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/usageFile/UsageFile.java b/src/main/java/com/chargebee/v4/models/usageFile/UsageFile.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/usageFile/UsageFile.java
rename to src/main/java/com/chargebee/v4/models/usageFile/UsageFile.java
index bdcc2fcb..7f78b55e 100644
--- a/src/main/java/com/chargebee/v4/core/models/usageFile/UsageFile.java
+++ b/src/main/java/com/chargebee/v4/models/usageFile/UsageFile.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.usageFile;
+package com.chargebee.v4.models.usageFile;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/usageFile/params/UsageFileProcessingStatusParams.java b/src/main/java/com/chargebee/v4/models/usageFile/params/UsageFileProcessingStatusParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/usageFile/params/UsageFileProcessingStatusParams.java
rename to src/main/java/com/chargebee/v4/models/usageFile/params/UsageFileProcessingStatusParams.java
index b23a5628..5bde6620 100644
--- a/src/main/java/com/chargebee/v4/core/models/usageFile/params/UsageFileProcessingStatusParams.java
+++ b/src/main/java/com/chargebee/v4/models/usageFile/params/UsageFileProcessingStatusParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.usageFile.params;
+package com.chargebee.v4.models.usageFile.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/usageFile/params/UsageFileUploadUrlParams.java b/src/main/java/com/chargebee/v4/models/usageFile/params/UsageFileUploadUrlParams.java
new file mode 100644
index 00000000..a00da439
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/usageFile/params/UsageFileUploadUrlParams.java
@@ -0,0 +1,80 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.usageFile.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class UsageFileUploadUrlParams {
+
+  private final String fileName;
+
+  private final String mimeType;
+
+  private UsageFileUploadUrlParams(UsageFileUploadUrlBuilder builder) {
+
+    this.fileName = builder.fileName;
+
+    this.mimeType = builder.mimeType;
+  }
+
+  public String getFileName() {
+    return fileName;
+  }
+
+  public String getMimeType() {
+    return mimeType;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.fileName != null) {
+
+      formData.put("file_name", this.fileName);
+    }
+
+    if (this.mimeType != null) {
+
+      formData.put("mime_type", this.mimeType);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for UsageFileUploadUrlParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static UsageFileUploadUrlBuilder builder() {
+    return new UsageFileUploadUrlBuilder();
+  }
+
+  public static final class UsageFileUploadUrlBuilder {
+
+    private String fileName;
+
+    private String mimeType;
+
+    private UsageFileUploadUrlBuilder() {}
+
+    public UsageFileUploadUrlBuilder fileName(String value) {
+      this.fileName = value;
+      return this;
+    }
+
+    public UsageFileUploadUrlBuilder mimeType(String value) {
+      this.mimeType = value;
+      return this;
+    }
+
+    public UsageFileUploadUrlParams build() {
+      return new UsageFileUploadUrlParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/usageFile/responses/UsageFileProcessingStatusResponse.java b/src/main/java/com/chargebee/v4/models/usageFile/responses/UsageFileProcessingStatusResponse.java
new file mode 100644
index 00000000..4e488e61
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/usageFile/responses/UsageFileProcessingStatusResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.usageFile.responses;
+
+import com.chargebee.v4.models.usageFile.UsageFile;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for UsageFileProcessingStatus operation. Contains the response data
+ * from a single resource get operation.
+ */
+public final class UsageFileProcessingStatusResponse extends BaseResponse {
+  private final UsageFile usageFile;
+
+  private UsageFileProcessingStatusResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.usageFile = builder.usageFile;
+  }
+
+  /** Parse JSON response into UsageFileProcessingStatusResponse object. */
+  public static UsageFileProcessingStatusResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into UsageFileProcessingStatusResponse object with HTTP response. */
+  public static UsageFileProcessingStatusResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __usageFileJson = JsonUtil.getObject(json, "usage_file");
+      if (__usageFileJson != null) {
+        builder.usageFile(UsageFile.fromJson(__usageFileJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse UsageFileProcessingStatusResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for UsageFileProcessingStatusResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for UsageFileProcessingStatusResponse. */
+  public static class Builder {
+
+    private UsageFile usageFile;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder usageFile(UsageFile usageFile) {
+      this.usageFile = usageFile;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public UsageFileProcessingStatusResponse build() {
+      return new UsageFileProcessingStatusResponse(this);
+    }
+  }
+
+  /** Get the usageFile from the response. */
+  public UsageFile getUsageFile() {
+    return usageFile;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/usageFile/UsageFileUploadUrlResponse.java b/src/main/java/com/chargebee/v4/models/usageFile/responses/UsageFileUploadUrlResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/usageFile/UsageFileUploadUrlResponse.java
rename to src/main/java/com/chargebee/v4/models/usageFile/responses/UsageFileUploadUrlResponse.java
index 92da79e9..a198e45e 100644
--- a/src/main/java/com/chargebee/v4/core/responses/usageFile/UsageFileUploadUrlResponse.java
+++ b/src/main/java/com/chargebee/v4/models/usageFile/responses/UsageFileUploadUrlResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.usageFile;
+package com.chargebee.v4.models.usageFile.responses;
 
-import com.chargebee.v4.core.models.usageFile.UsageFile;
+import com.chargebee.v4.models.usageFile.UsageFile;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/usageReminderInfo/UsageReminderInfo.java b/src/main/java/com/chargebee/v4/models/usageReminderInfo/UsageReminderInfo.java
similarity index 93%
rename from src/main/java/com/chargebee/v4/core/models/usageReminderInfo/UsageReminderInfo.java
rename to src/main/java/com/chargebee/v4/models/usageReminderInfo/UsageReminderInfo.java
index d3c22466..231fa99d 100644
--- a/src/main/java/com/chargebee/v4/core/models/usageReminderInfo/UsageReminderInfo.java
+++ b/src/main/java/com/chargebee/v4/models/usageReminderInfo/UsageReminderInfo.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.usageReminderInfo;
+package com.chargebee.v4.models.usageReminderInfo;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/core/models/variant/Variant.java b/src/main/java/com/chargebee/v4/models/variant/Variant.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/variant/Variant.java
rename to src/main/java/com/chargebee/v4/models/variant/Variant.java
index d350d442..794452b0 100644
--- a/src/main/java/com/chargebee/v4/core/models/variant/Variant.java
+++ b/src/main/java/com/chargebee/v4/models/variant/Variant.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.variant;
+package com.chargebee.v4.models.variant;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
diff --git a/src/main/java/com/chargebee/v4/models/variant/params/CreateProductVariantParams.java b/src/main/java/com/chargebee/v4/models/variant/params/CreateProductVariantParams.java
new file mode 100644
index 00000000..cb5e76b5
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/variant/params/CreateProductVariantParams.java
@@ -0,0 +1,308 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.variant.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class CreateProductVariantParams {
+
+  private final String id;
+
+  private final String name;
+
+  private final String externalName;
+
+  private final String description;
+
+  private final String sku;
+
+  private final java.util.Map<String, Object> metadata;
+
+  private final Status status;
+
+  private final List<OptionValuesParams> optionValues;
+
+  private CreateProductVariantParams(CreateProductVariantBuilder builder) {
+
+    this.id = builder.id;
+
+    this.name = builder.name;
+
+    this.externalName = builder.externalName;
+
+    this.description = builder.description;
+
+    this.sku = builder.sku;
+
+    this.metadata = builder.metadata;
+
+    this.status = builder.status;
+
+    this.optionValues = builder.optionValues;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getExternalName() {
+    return externalName;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public String getSku() {
+    return sku;
+  }
+
+  public java.util.Map<String, Object> getMetadata() {
+    return metadata;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public List<OptionValuesParams> getOptionValues() {
+    return optionValues;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.id != null) {
+
+      formData.put("id", this.id);
+    }
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.externalName != null) {
+
+      formData.put("external_name", this.externalName);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.sku != null) {
+
+      formData.put("sku", this.sku);
+    }
+
+    if (this.metadata != null) {
+
+      formData.put("metadata", JsonUtil.toJson(this.metadata));
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.optionValues != null) {
+
+      // List of objects
+      for (int i = 0; i < this.optionValues.size(); i++) {
+        OptionValuesParams item = this.optionValues.get(i);
+        if (item != null) {
+          Map<String, Object> itemData = item.toFormData();
+          for (Map.Entry<String, Object> entry : itemData.entrySet()) {
+            String indexedKey = "option_values[" + entry.getKey() + "][" + i + "]";
+            formData.put(indexedKey, entry.getValue());
+          }
+        }
+      }
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for CreateProductVariantParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static CreateProductVariantBuilder builder() {
+    return new CreateProductVariantBuilder();
+  }
+
+  public static final class CreateProductVariantBuilder {
+
+    private String id;
+
+    private String name;
+
+    private String externalName;
+
+    private String description;
+
+    private String sku;
+
+    private java.util.Map<String, Object> metadata;
+
+    private Status status;
+
+    private List<OptionValuesParams> optionValues;
+
+    private CreateProductVariantBuilder() {}
+
+    public CreateProductVariantBuilder id(String value) {
+      this.id = value;
+      return this;
+    }
+
+    public CreateProductVariantBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public CreateProductVariantBuilder externalName(String value) {
+      this.externalName = value;
+      return this;
+    }
+
+    public CreateProductVariantBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public CreateProductVariantBuilder sku(String value) {
+      this.sku = value;
+      return this;
+    }
+
+    public CreateProductVariantBuilder metadata(java.util.Map<String, Object> value) {
+      this.metadata = value;
+      return this;
+    }
+
+    public CreateProductVariantBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public CreateProductVariantBuilder optionValues(List<OptionValuesParams> value) {
+      this.optionValues = value;
+      return this;
+    }
+
+    public CreateProductVariantParams build() {
+      return new CreateProductVariantParams(this);
+    }
+  }
+
+  public enum Status {
+    ACTIVE("active"),
+
+    INACTIVE("inactive"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public static final class OptionValuesParams {
+
+    private final String name;
+
+    private final String value;
+
+    private OptionValuesParams(OptionValuesBuilder builder) {
+
+      this.name = builder.name;
+
+      this.value = builder.value;
+    }
+
+    public String getName() {
+      return name;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    /** Get the form data for this request. */
+    public Map<String, Object> toFormData() {
+      Map<String, Object> formData = new LinkedHashMap<>();
+
+      if (this.name != null) {
+
+        formData.put("name", this.name);
+      }
+
+      if (this.value != null) {
+
+        formData.put("value", this.value);
+      }
+
+      return formData;
+    }
+
+    /** Create a new builder for OptionValuesParams. */
+    @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+    public static OptionValuesBuilder builder() {
+      return new OptionValuesBuilder();
+    }
+
+    public static final class OptionValuesBuilder {
+
+      private String name;
+
+      private String value;
+
+      private OptionValuesBuilder() {}
+
+      public OptionValuesBuilder name(String value) {
+        this.name = value;
+        return this;
+      }
+
+      public OptionValuesBuilder value(String value) {
+        this.value = value;
+        return this;
+      }
+
+      public OptionValuesParams build() {
+        return new OptionValuesParams(this);
+      }
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/variant/params/ListProductVariantsParams.java b/src/main/java/com/chargebee/v4/models/variant/params/ListProductVariantsParams.java
new file mode 100644
index 00000000..da0a5f21
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/variant/params/ListProductVariantsParams.java
@@ -0,0 +1,469 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.models.variant.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.sql.Timestamp;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class ListProductVariantsParams {
+
+  private final Map<String, Object> queryParams;
+
+  private ListProductVariantsParams(ListProductVariantsBuilder builder) {
+    this.queryParams = Collections.unmodifiableMap(new LinkedHashMap<>(builder.queryParams));
+  }
+
+  /** Get the query parameters for this request. */
+  public Map<String, Object> toQueryParams() {
+    return queryParams;
+  }
+
+  public ListProductVariantsBuilder toBuilder() {
+    ListProductVariantsBuilder builder = new ListProductVariantsBuilder();
+    builder.queryParams.putAll(queryParams);
+    return builder;
+  }
+
+  /** Create a new builder for ListProductVariantsParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static ListProductVariantsBuilder builder() {
+    return new ListProductVariantsBuilder();
+  }
+
+  public static final class ListProductVariantsBuilder {
+    private final Map<String, Object> queryParams = new LinkedHashMap<>();
+
+    private ListProductVariantsBuilder() {}
+
+    public ListProductVariantsBuilder limit(Integer value) {
+      queryParams.put("limit", value);
+      return this;
+    }
+
+    public ListProductVariantsBuilder offset(String value) {
+      queryParams.put("offset", value);
+      return this;
+    }
+
+    public ListProductVariantsBuilder includeDeleted(Boolean value) {
+      queryParams.put("include_deleted", value);
+      return this;
+    }
+
+    public IdFilter id() {
+      return new IdFilter("id", this);
+    }
+
+    public NameFilter name() {
+      return new NameFilter("name", this);
+    }
+
+    public SkuFilter sku() {
+      return new SkuFilter("sku", this);
+    }
+
+    public StatusFilter status() {
+      return new StatusFilter("status", this);
+    }
+
+    public UpdatedAtFilter updatedAt() {
+      return new UpdatedAtFilter("updated_at", this);
+    }
+
+    public CreatedAtFilter createdAt() {
+      return new CreatedAtFilter("created_at", this);
+    }
+
+    public SortBySortBuilder sortBy() {
+      return new SortBySortBuilder("sort_by", this);
+    }
+
+    public ListProductVariantsParams build() {
+      return new ListProductVariantsParams(this);
+    }
+
+    public static final class IdFilter {
+      private final String fieldName;
+      private final ListProductVariantsBuilder builder;
+
+      IdFilter(String fieldName, ListProductVariantsBuilder builder) {
+        this.fieldName = fieldName;
+        this.builder = builder;
+      }
+
+      public ListProductVariantsBuilder is(String value) {
+        builder.queryParams.put(fieldName + "[is]", value);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder isNot(String value) {
+        builder.queryParams.put(fieldName + "[is_not]", value);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder startsWith(String value) {
+        builder.queryParams.put(fieldName + "[starts_with]", value);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder in(String... values) {
+        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
+        return builder;
+      }
+
+      public ListProductVariantsBuilder notIn(String... values) {
+        builder.queryParams.put(fieldName + "[not_in]", "[" + String.join(",", values) + "]");
+        return builder;
+      }
+    }
+
+    public static final class NameFilter {
+      private final String fieldName;
+      private final ListProductVariantsBuilder builder;
+
+      NameFilter(String fieldName, ListProductVariantsBuilder builder) {
+        this.fieldName = fieldName;
+        this.builder = builder;
+      }
+
+      public ListProductVariantsBuilder is(String value) {
+        builder.queryParams.put(fieldName + "[is]", value);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder isNot(String value) {
+        builder.queryParams.put(fieldName + "[is_not]", value);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder startsWith(String value) {
+        builder.queryParams.put(fieldName + "[starts_with]", value);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder in(String... values) {
+        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
+        return builder;
+      }
+
+      public ListProductVariantsBuilder notIn(String... values) {
+        builder.queryParams.put(fieldName + "[not_in]", "[" + String.join(",", values) + "]");
+        return builder;
+      }
+    }
+
+    public static final class SkuFilter {
+      private final String fieldName;
+      private final ListProductVariantsBuilder builder;
+
+      SkuFilter(String fieldName, ListProductVariantsBuilder builder) {
+        this.fieldName = fieldName;
+        this.builder = builder;
+      }
+
+      public ListProductVariantsBuilder is(String value) {
+        builder.queryParams.put(fieldName + "[is]", value);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder isNot(String value) {
+        builder.queryParams.put(fieldName + "[is_not]", value);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder startsWith(String value) {
+        builder.queryParams.put(fieldName + "[starts_with]", value);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder in(String... values) {
+        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
+        return builder;
+      }
+
+      public ListProductVariantsBuilder notIn(String... values) {
+        builder.queryParams.put(fieldName + "[not_in]", "[" + String.join(",", values) + "]");
+        return builder;
+      }
+    }
+
+    public static final class StatusFilter {
+      private final String fieldName;
+      private final ListProductVariantsBuilder builder;
+
+      StatusFilter(String fieldName, ListProductVariantsBuilder builder) {
+        this.fieldName = fieldName;
+        this.builder = builder;
+      }
+
+      public ListProductVariantsBuilder is(String value) {
+        builder.queryParams.put(fieldName + "[is]", value);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder isNot(String value) {
+        builder.queryParams.put(fieldName + "[is_not]", value);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder in(String... values) {
+        builder.queryParams.put(fieldName + "[in]", "[" + String.join(",", values) + "]");
+        return builder;
+      }
+
+      public ListProductVariantsBuilder notIn(String... values) {
+        builder.queryParams.put(fieldName + "[not_in]", "[" + String.join(",", values) + "]");
+        return builder;
+      }
+    }
+
+    public static final class UpdatedAtFilter {
+      private final String fieldName;
+      private final ListProductVariantsBuilder builder;
+
+      UpdatedAtFilter(String fieldName, ListProductVariantsBuilder builder) {
+        this.fieldName = fieldName;
+        this.builder = builder;
+      }
+
+      public ListProductVariantsBuilder after(Timestamp timestamp) {
+        builder.queryParams.put(fieldName + "[after]", timestamp.getTime() / 1000);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder before(Timestamp timestamp) {
+        builder.queryParams.put(fieldName + "[before]", timestamp.getTime() / 1000);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder on(Timestamp timestamp) {
+        builder.queryParams.put(fieldName + "[on]", timestamp.getTime() / 1000);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder between(Timestamp start, Timestamp end) {
+        builder.queryParams.put(
+            fieldName + "[between]",
+            "[" + (start.getTime() / 1000) + "," + (end.getTime() / 1000) + "]");
+        return builder;
+      }
+    }
+
+    public static final class CreatedAtFilter {
+      private final String fieldName;
+      private final ListProductVariantsBuilder builder;
+
+      CreatedAtFilter(String fieldName, ListProductVariantsBuilder builder) {
+        this.fieldName = fieldName;
+        this.builder = builder;
+      }
+
+      public ListProductVariantsBuilder after(Timestamp timestamp) {
+        builder.queryParams.put(fieldName + "[after]", timestamp.getTime() / 1000);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder before(Timestamp timestamp) {
+        builder.queryParams.put(fieldName + "[before]", timestamp.getTime() / 1000);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder on(Timestamp timestamp) {
+        builder.queryParams.put(fieldName + "[on]", timestamp.getTime() / 1000);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder between(Timestamp start, Timestamp end) {
+        builder.queryParams.put(
+            fieldName + "[between]",
+            "[" + (start.getTime() / 1000) + "," + (end.getTime() / 1000) + "]");
+        return builder;
+      }
+    }
+
+    public static final class SortBySortBuilder {
+      private final String fieldName;
+      private final ListProductVariantsBuilder builder;
+
+      SortBySortBuilder(String fieldName, ListProductVariantsBuilder builder) {
+        this.fieldName = fieldName;
+        this.builder = builder;
+      }
+
+      public SortDirection name() {
+        return new SortDirection(fieldName, "name", builder);
+      }
+
+      public SortDirection id() {
+        return new SortDirection(fieldName, "id", builder);
+      }
+
+      public SortDirection status() {
+        return new SortDirection(fieldName, "status", builder);
+      }
+
+      public SortDirection created_at() {
+        return new SortDirection(fieldName, "created_at", builder);
+      }
+
+      public SortDirection updated_at() {
+        return new SortDirection(fieldName, "updated_at", builder);
+      }
+    }
+
+    public static final class SortDirection {
+      private final String fieldName;
+      private final String selectedField;
+      private final ListProductVariantsBuilder builder;
+
+      SortDirection(String fieldName, String selectedField, ListProductVariantsBuilder builder) {
+        this.fieldName = fieldName;
+        this.selectedField = selectedField;
+        this.builder = builder;
+      }
+
+      public ListProductVariantsBuilder asc() {
+        builder.queryParams.put(fieldName + "[asc]", selectedField);
+        return builder;
+      }
+
+      public ListProductVariantsBuilder desc() {
+        builder.queryParams.put(fieldName + "[desc]", selectedField);
+        return builder;
+      }
+    }
+  }
+
+  public enum StatusIs {
+    ACTIVE("active"),
+
+    INACTIVE("inactive"),
+
+    /** An enum member indicating that StatusIs was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    StatusIs(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static StatusIs fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (StatusIs enumValue : StatusIs.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum StatusIsNot {
+    ACTIVE("active"),
+
+    INACTIVE("inactive"),
+
+    /** An enum member indicating that StatusIsNot was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    StatusIsNot(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static StatusIsNot fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (StatusIsNot enumValue : StatusIsNot.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum SortByAsc {
+    NAME("name"),
+
+    ID("id"),
+
+    STATUS("status"),
+
+    CREATED_AT("created_at"),
+
+    UPDATED_AT("updated_at"),
+
+    /** An enum member indicating that SortByAsc was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    SortByAsc(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static SortByAsc fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (SortByAsc enumValue : SortByAsc.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum SortByDesc {
+    NAME("name"),
+
+    ID("id"),
+
+    STATUS("status"),
+
+    CREATED_AT("created_at"),
+
+    UPDATED_AT("updated_at"),
+
+    /** An enum member indicating that SortByDesc was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    SortByDesc(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static SortByDesc fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (SortByDesc enumValue : SortByDesc.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/variant/params/VariantDeleteParams.java b/src/main/java/com/chargebee/v4/models/variant/params/VariantDeleteParams.java
new file mode 100644
index 00000000..eb351fb4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/variant/params/VariantDeleteParams.java
@@ -0,0 +1,39 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.variant.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class VariantDeleteParams {
+
+  private VariantDeleteParams(VariantDeleteBuilder builder) {}
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    return formData;
+  }
+
+  /** Create a new builder for VariantDeleteParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static VariantDeleteBuilder builder() {
+    return new VariantDeleteBuilder();
+  }
+
+  public static final class VariantDeleteBuilder {
+
+    private VariantDeleteBuilder() {}
+
+    public VariantDeleteParams build() {
+      return new VariantDeleteParams(this);
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/variant/params/VariantRetrieveParams.java b/src/main/java/com/chargebee/v4/models/variant/params/VariantRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/variant/params/VariantRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/variant/params/VariantRetrieveParams.java
index 3855e330..c908577e 100644
--- a/src/main/java/com/chargebee/v4/core/models/variant/params/VariantRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/variant/params/VariantRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.variant.params;
+package com.chargebee.v4.models.variant.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/variant/params/VariantUpdateParams.java b/src/main/java/com/chargebee/v4/models/variant/params/VariantUpdateParams.java
new file mode 100644
index 00000000..0269fe29
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/variant/params/VariantUpdateParams.java
@@ -0,0 +1,189 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.variant.params;
+
+import com.chargebee.v4.internal.Recommended;
+import com.chargebee.v4.internal.JsonUtil;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class VariantUpdateParams {
+
+  private final String name;
+
+  private final String description;
+
+  private final Status status;
+
+  private final String externalName;
+
+  private final String sku;
+
+  private final java.util.Map<String, Object> metadata;
+
+  private VariantUpdateParams(VariantUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.description = builder.description;
+
+    this.status = builder.status;
+
+    this.externalName = builder.externalName;
+
+    this.sku = builder.sku;
+
+    this.metadata = builder.metadata;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public String getExternalName() {
+    return externalName;
+  }
+
+  public String getSku() {
+    return sku;
+  }
+
+  public java.util.Map<String, Object> getMetadata() {
+    return metadata;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.description != null) {
+
+      formData.put("description", this.description);
+    }
+
+    if (this.status != null) {
+
+      formData.put("status", this.status);
+    }
+
+    if (this.externalName != null) {
+
+      formData.put("external_name", this.externalName);
+    }
+
+    if (this.sku != null) {
+
+      formData.put("sku", this.sku);
+    }
+
+    if (this.metadata != null) {
+
+      formData.put("metadata", JsonUtil.toJson(this.metadata));
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for VariantUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static VariantUpdateBuilder builder() {
+    return new VariantUpdateBuilder();
+  }
+
+  public static final class VariantUpdateBuilder {
+
+    private String name;
+
+    private String description;
+
+    private Status status;
+
+    private String externalName;
+
+    private String sku;
+
+    private java.util.Map<String, Object> metadata;
+
+    private VariantUpdateBuilder() {}
+
+    public VariantUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public VariantUpdateBuilder description(String value) {
+      this.description = value;
+      return this;
+    }
+
+    public VariantUpdateBuilder status(Status value) {
+      this.status = value;
+      return this;
+    }
+
+    public VariantUpdateBuilder externalName(String value) {
+      this.externalName = value;
+      return this;
+    }
+
+    public VariantUpdateBuilder sku(String value) {
+      this.sku = value;
+      return this;
+    }
+
+    public VariantUpdateBuilder metadata(java.util.Map<String, Object> value) {
+      this.metadata = value;
+      return this;
+    }
+
+    public VariantUpdateParams build() {
+      return new VariantUpdateParams(this);
+    }
+  }
+
+  public enum Status {
+    ACTIVE("active"),
+
+    INACTIVE("inactive"),
+
+    /** An enum member indicating that Status was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Status(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Status fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Status enumValue : Status.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/variant/responses/CreateProductVariantResponse.java b/src/main/java/com/chargebee/v4/models/variant/responses/CreateProductVariantResponse.java
new file mode 100644
index 00000000..fc97a581
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/variant/responses/CreateProductVariantResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.variant.responses;
+
+import com.chargebee.v4.models.variant.Variant;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for CreateProductVariant operation. Contains the response data from the
+ * API.
+ */
+public final class CreateProductVariantResponse extends BaseResponse {
+  private final Variant variant;
+
+  private CreateProductVariantResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.variant = builder.variant;
+  }
+
+  /** Parse JSON response into CreateProductVariantResponse object. */
+  public static CreateProductVariantResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into CreateProductVariantResponse object with HTTP response. */
+  public static CreateProductVariantResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __variantJson = JsonUtil.getObject(json, "variant");
+      if (__variantJson != null) {
+        builder.variant(Variant.fromJson(__variantJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse CreateProductVariantResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for CreateProductVariantResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for CreateProductVariantResponse. */
+  public static class Builder {
+
+    private Variant variant;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder variant(Variant variant) {
+      this.variant = variant;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public CreateProductVariantResponse build() {
+      return new CreateProductVariantResponse(this);
+    }
+  }
+
+  /** Get the variant from the response. */
+  public Variant getVariant() {
+    return variant;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/variant/responses/ListProductVariantsResponse.java b/src/main/java/com/chargebee/v4/models/variant/responses/ListProductVariantsResponse.java
new file mode 100644
index 00000000..10db0f20
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/variant/responses/ListProductVariantsResponse.java
@@ -0,0 +1,172 @@
+package com.chargebee.v4.models.variant.responses;
+
+import java.util.List;
+
+import com.chargebee.v4.models.variant.Variant;
+
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+import com.chargebee.v4.services.VariantService;
+import com.chargebee.v4.models.variant.params.ListProductVariantsParams;
+
+/** Immutable response object for ListProductVariants operation. Contains paginated list data. */
+public final class ListProductVariantsResponse {
+
+  private final List<VariantListProductVariantsItem> list;
+
+  private final String nextOffset;
+
+  private final String productId;
+
+  private final VariantService service;
+  private final ListProductVariantsParams originalParams;
+  private final Response httpResponse;
+
+  private ListProductVariantsResponse(
+      List<VariantListProductVariantsItem> list,
+      String nextOffset,
+      String productId,
+      VariantService service,
+      ListProductVariantsParams originalParams,
+      Response httpResponse) {
+
+    this.list = list;
+
+    this.nextOffset = nextOffset;
+
+    this.productId = productId;
+
+    this.service = service;
+    this.originalParams = originalParams;
+    this.httpResponse = httpResponse;
+  }
+
+  /**
+   * Parse JSON response into ListProductVariantsResponse object (no service context). Use this when
+   * you only need to read a single page (no nextPage()).
+   */
+  public static ListProductVariantsResponse fromJson(String json) {
+    try {
+
+      List<VariantListProductVariantsItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(VariantListProductVariantsItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new ListProductVariantsResponse(list, nextOffset, null, null, null, null);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ListProductVariantsResponse from JSON", e);
+    }
+  }
+
+  /**
+   * Parse JSON response into ListProductVariantsResponse object with service context for pagination
+   * (enables nextPage()).
+   */
+  public static ListProductVariantsResponse fromJson(
+      String json,
+      VariantService service,
+      ListProductVariantsParams originalParams,
+      String productId,
+      Response httpResponse) {
+    try {
+
+      List<VariantListProductVariantsItem> list =
+          JsonUtil.parseObjectArray(JsonUtil.getArray(json, "list")).stream()
+              .map(VariantListProductVariantsItem::fromJson)
+              .collect(java.util.stream.Collectors.toList());
+
+      String nextOffset = JsonUtil.getString(json, "next_offset");
+
+      return new ListProductVariantsResponse(
+          list, nextOffset, productId, service, originalParams, httpResponse);
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse ListProductVariantsResponse from JSON", e);
+    }
+  }
+
+  /** Get the list from the response. */
+  public List<VariantListProductVariantsItem> getList() {
+    return list;
+  }
+
+  /** Get the nextOffset from the response. */
+  public String getNextOffset() {
+    return nextOffset;
+  }
+
+  /** Check if there are more pages available. */
+  public boolean hasNextPage() {
+    return nextOffset != null && !nextOffset.isEmpty();
+  }
+
+  /**
+   * Get the next page of results.
+   *
+   * @throws ChargebeeException if unable to fetch next page
+   */
+  public ListProductVariantsResponse nextPage() throws ChargebeeException {
+    if (!hasNextPage()) {
+      throw new IllegalStateException("No more pages available");
+    }
+    if (service == null) {
+      throw new UnsupportedOperationException(
+          "nextPage() requires service context. Use fromJson(json, service, originalParams, httpResponse).");
+    }
+
+    ListProductVariantsParams nextParams =
+        (originalParams != null ? originalParams.toBuilder() : ListProductVariantsParams.builder())
+            .offset(nextOffset)
+            .build();
+
+    return service.listProductVariants(productId, nextParams);
+  }
+
+  /** Get the raw response payload as JSON string. */
+  public String responsePayload() {
+    return httpResponse != null ? httpResponse.getBodyAsString() : null;
+  }
+
+  /** Get the HTTP status code. */
+  public int httpStatus() {
+    return httpResponse != null ? httpResponse.getStatusCode() : 0;
+  }
+
+  /** Get response headers. */
+  public java.util.Map<String, java.util.List<String>> headers() {
+    return httpResponse != null ? httpResponse.getHeaders() : java.util.Collections.emptyMap();
+  }
+
+  /** Get a specific header value. */
+  public java.util.List<String> header(String name) {
+    if (httpResponse == null) return null;
+    return httpResponse.getHeaders().entrySet().stream()
+        .filter(e -> e.getKey().equalsIgnoreCase(name))
+        .map(java.util.Map.Entry::getValue)
+        .findFirst()
+        .orElse(null);
+  }
+
+  public static class VariantListProductVariantsItem {
+
+    private Variant variant;
+
+    public Variant getVariant() {
+      return variant;
+    }
+
+    public static VariantListProductVariantsItem fromJson(String json) {
+      VariantListProductVariantsItem item = new VariantListProductVariantsItem();
+
+      String __variantJson = JsonUtil.getObject(json, "variant");
+      if (__variantJson != null) {
+        item.variant = Variant.fromJson(__variantJson);
+      }
+
+      return item;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/variant/VariantDeleteResponse.java b/src/main/java/com/chargebee/v4/models/variant/responses/VariantDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/variant/VariantDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/variant/responses/VariantDeleteResponse.java
index 6b157fb9..d18daabc 100644
--- a/src/main/java/com/chargebee/v4/core/responses/variant/VariantDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/variant/responses/VariantDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.variant;
+package com.chargebee.v4.models.variant.responses;
 
-import com.chargebee.v4.core.models.variant.Variant;
+import com.chargebee.v4.models.variant.Variant;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/models/variant/responses/VariantRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/variant/responses/VariantRetrieveResponse.java
new file mode 100644
index 00000000..105c696e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/variant/responses/VariantRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.variant.responses;
+
+import com.chargebee.v4.models.variant.Variant;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for VariantRetrieve operation. Contains the response data from a single
+ * resource get operation.
+ */
+public final class VariantRetrieveResponse extends BaseResponse {
+  private final Variant variant;
+
+  private VariantRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.variant = builder.variant;
+  }
+
+  /** Parse JSON response into VariantRetrieveResponse object. */
+  public static VariantRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into VariantRetrieveResponse object with HTTP response. */
+  public static VariantRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __variantJson = JsonUtil.getObject(json, "variant");
+      if (__variantJson != null) {
+        builder.variant(Variant.fromJson(__variantJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse VariantRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for VariantRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for VariantRetrieveResponse. */
+  public static class Builder {
+
+    private Variant variant;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder variant(Variant variant) {
+      this.variant = variant;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public VariantRetrieveResponse build() {
+      return new VariantRetrieveResponse(this);
+    }
+  }
+
+  /** Get the variant from the response. */
+  public Variant getVariant() {
+    return variant;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/variant/VariantUpdateResponse.java b/src/main/java/com/chargebee/v4/models/variant/responses/VariantUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/variant/VariantUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/variant/responses/VariantUpdateResponse.java
index 15634a93..2cedba26 100644
--- a/src/main/java/com/chargebee/v4/core/responses/variant/VariantUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/variant/responses/VariantUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.variant;
+package com.chargebee.v4.models.variant.responses;
 
-import com.chargebee.v4.core.models.variant.Variant;
+import com.chargebee.v4.models.variant.Variant;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/VirtualBankAccount.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/VirtualBankAccount.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/virtualBankAccount/VirtualBankAccount.java
rename to src/main/java/com/chargebee/v4/models/virtualBankAccount/VirtualBankAccount.java
index 17c17d35..00f5ed73 100644
--- a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/VirtualBankAccount.java
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/VirtualBankAccount.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.virtualBankAccount;
+package com.chargebee.v4.models.virtualBankAccount;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.sql.Timestamp;
@@ -237,6 +237,8 @@ public enum Gateway {
 
     DEUTSCHE_BANK("deutsche_bank"),
 
+    EZIDEBIT("ezidebit"),
+
     NOT_APPLICABLE("not_applicable"),
 
     /** An enum member indicating that Gateway was instantiated with an unknown value. */
diff --git a/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountCreateParams.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountCreateParams.java
new file mode 100644
index 00000000..4adb9a13
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountCreateParams.java
@@ -0,0 +1,138 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.virtualBankAccount.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class VirtualBankAccountCreateParams {
+
+  private final String customerId;
+
+  private final String email;
+
+  private final Scheme scheme;
+
+  private VirtualBankAccountCreateParams(VirtualBankAccountCreateBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.email = builder.email;
+
+    this.scheme = builder.scheme;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getEmail() {
+    return email;
+  }
+
+  public Scheme getScheme() {
+    return scheme;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.email != null) {
+
+      formData.put("email", this.email);
+    }
+
+    if (this.scheme != null) {
+
+      formData.put("scheme", this.scheme);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for VirtualBankAccountCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static VirtualBankAccountCreateBuilder builder() {
+    return new VirtualBankAccountCreateBuilder();
+  }
+
+  public static final class VirtualBankAccountCreateBuilder {
+
+    private String customerId;
+
+    private String email;
+
+    private Scheme scheme;
+
+    private VirtualBankAccountCreateBuilder() {}
+
+    public VirtualBankAccountCreateBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public VirtualBankAccountCreateBuilder email(String value) {
+      this.email = value;
+      return this;
+    }
+
+    public VirtualBankAccountCreateBuilder scheme(Scheme value) {
+      this.scheme = value;
+      return this;
+    }
+
+    public VirtualBankAccountCreateParams build() {
+      return new VirtualBankAccountCreateParams(this);
+    }
+  }
+
+  public enum Scheme {
+    ACH_CREDIT("ach_credit"),
+
+    SEPA_CREDIT("sepa_credit"),
+
+    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+    GB_AUTOMATED_BANK_TRANSFER("gb_automated_bank_transfer"),
+
+    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+    /** An enum member indicating that Scheme was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Scheme(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Scheme fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Scheme enumValue : Scheme.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountCreateUsingPermanentTokenParams.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountCreateUsingPermanentTokenParams.java
new file mode 100644
index 00000000..ff7dbdd2
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountCreateUsingPermanentTokenParams.java
@@ -0,0 +1,139 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.virtualBankAccount.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public final class VirtualBankAccountCreateUsingPermanentTokenParams {
+
+  private final String customerId;
+
+  private final String referenceId;
+
+  private final Scheme scheme;
+
+  private VirtualBankAccountCreateUsingPermanentTokenParams(
+      VirtualBankAccountCreateUsingPermanentTokenBuilder builder) {
+
+    this.customerId = builder.customerId;
+
+    this.referenceId = builder.referenceId;
+
+    this.scheme = builder.scheme;
+  }
+
+  public String getCustomerId() {
+    return customerId;
+  }
+
+  public String getReferenceId() {
+    return referenceId;
+  }
+
+  public Scheme getScheme() {
+    return scheme;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.customerId != null) {
+
+      formData.put("customer_id", this.customerId);
+    }
+
+    if (this.referenceId != null) {
+
+      formData.put("reference_id", this.referenceId);
+    }
+
+    if (this.scheme != null) {
+
+      formData.put("scheme", this.scheme);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for VirtualBankAccountCreateUsingPermanentTokenParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static VirtualBankAccountCreateUsingPermanentTokenBuilder builder() {
+    return new VirtualBankAccountCreateUsingPermanentTokenBuilder();
+  }
+
+  public static final class VirtualBankAccountCreateUsingPermanentTokenBuilder {
+
+    private String customerId;
+
+    private String referenceId;
+
+    private Scheme scheme;
+
+    private VirtualBankAccountCreateUsingPermanentTokenBuilder() {}
+
+    public VirtualBankAccountCreateUsingPermanentTokenBuilder customerId(String value) {
+      this.customerId = value;
+      return this;
+    }
+
+    public VirtualBankAccountCreateUsingPermanentTokenBuilder referenceId(String value) {
+      this.referenceId = value;
+      return this;
+    }
+
+    public VirtualBankAccountCreateUsingPermanentTokenBuilder scheme(Scheme value) {
+      this.scheme = value;
+      return this;
+    }
+
+    public VirtualBankAccountCreateUsingPermanentTokenParams build() {
+      return new VirtualBankAccountCreateUsingPermanentTokenParams(this);
+    }
+  }
+
+  public enum Scheme {
+    ACH_CREDIT("ach_credit"),
+
+    SEPA_CREDIT("sepa_credit"),
+
+    US_AUTOMATED_BANK_TRANSFER("us_automated_bank_transfer"),
+
+    GB_AUTOMATED_BANK_TRANSFER("gb_automated_bank_transfer"),
+
+    EU_AUTOMATED_BANK_TRANSFER("eu_automated_bank_transfer"),
+
+    JP_AUTOMATED_BANK_TRANSFER("jp_automated_bank_transfer"),
+
+    MX_AUTOMATED_BANK_TRANSFER("mx_automated_bank_transfer"),
+
+    /** An enum member indicating that Scheme was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    Scheme(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static Scheme fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (Scheme enumValue : Scheme.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountDeleteLocalParams.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountDeleteLocalParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountDeleteLocalParams.java
rename to src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountDeleteLocalParams.java
index be6588e5..b91169a1 100644
--- a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountDeleteLocalParams.java
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountDeleteLocalParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.virtualBankAccount.params;
+package com.chargebee.v4.models.virtualBankAccount.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class VirtualBankAccountDeleteLocalParams {
 
-  private final Map<String, Object> formData;
-
-  private VirtualBankAccountDeleteLocalParams(VirtualBankAccountDeleteLocalBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private VirtualBankAccountDeleteLocalParams(VirtualBankAccountDeleteLocalBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static VirtualBankAccountDeleteLocalBuilder builder() {
   }
 
   public static final class VirtualBankAccountDeleteLocalBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private VirtualBankAccountDeleteLocalBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountDeleteParams.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountDeleteParams.java
index aeae47cd..ba6a42da 100644
--- a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountDeleteParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.virtualBankAccount.params;
+package com.chargebee.v4.models.virtualBankAccount.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class VirtualBankAccountDeleteParams {
 
-  private final Map<String, Object> formData;
-
-  private VirtualBankAccountDeleteParams(VirtualBankAccountDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private VirtualBankAccountDeleteParams(VirtualBankAccountDeleteBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static VirtualBankAccountDeleteBuilder builder() {
   }
 
   public static final class VirtualBankAccountDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private VirtualBankAccountDeleteBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountListParams.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountListParams.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountListParams.java
rename to src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountListParams.java
index 29c00de5..9c8b0366 100644
--- a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountListParams.java
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.virtualBankAccount.params;
+package com.chargebee.v4.models.virtualBankAccount.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountRetrieveParams.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountRetrieveParams.java
index ce08bc52..532f0ecd 100644
--- a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.virtualBankAccount.params;
+package com.chargebee.v4.models.virtualBankAccount.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountSyncFundParams.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountSyncFundParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountSyncFundParams.java
rename to src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountSyncFundParams.java
index 1d02c9e3..a36c17c4 100644
--- a/src/main/java/com/chargebee/v4/core/models/virtualBankAccount/params/VirtualBankAccountSyncFundParams.java
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/params/VirtualBankAccountSyncFundParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.virtualBankAccount.params;
+package com.chargebee.v4.models.virtualBankAccount.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class VirtualBankAccountSyncFundParams {
 
-  private final Map<String, Object> formData;
-
-  private VirtualBankAccountSyncFundParams(VirtualBankAccountSyncFundBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private VirtualBankAccountSyncFundParams(VirtualBankAccountSyncFundBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static VirtualBankAccountSyncFundBuilder builder() {
   }
 
   public static final class VirtualBankAccountSyncFundBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private VirtualBankAccountSyncFundBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountCreateResponse.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountCreateResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountCreateResponse.java
index 90503f16..2cd4f897 100644
--- a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountCreateResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.virtualBankAccount;
+package com.chargebee.v4.models.virtualBankAccount.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.virtualBankAccount.VirtualBankAccount;
+import com.chargebee.v4.models.virtualBankAccount.VirtualBankAccount;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountCreateUsingPermanentTokenResponse.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountCreateUsingPermanentTokenResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountCreateUsingPermanentTokenResponse.java
rename to src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountCreateUsingPermanentTokenResponse.java
index b2171b00..78aaf9aa 100644
--- a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountCreateUsingPermanentTokenResponse.java
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountCreateUsingPermanentTokenResponse.java
@@ -1,10 +1,10 @@
-package com.chargebee.v4.core.responses.virtualBankAccount;
+package com.chargebee.v4.models.virtualBankAccount.responses;
 
-import com.chargebee.v4.core.models.customer.Customer;
+import com.chargebee.v4.models.customer.Customer;
 
-import com.chargebee.v4.core.models.virtualBankAccount.VirtualBankAccount;
+import com.chargebee.v4.models.virtualBankAccount.VirtualBankAccount;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountDeleteLocalResponse.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountDeleteLocalResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountDeleteLocalResponse.java
rename to src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountDeleteLocalResponse.java
index fac3e9e7..e5287124 100644
--- a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountDeleteLocalResponse.java
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountDeleteLocalResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.virtualBankAccount;
+package com.chargebee.v4.models.virtualBankAccount.responses;
 
-import com.chargebee.v4.core.models.virtualBankAccount.VirtualBankAccount;
+import com.chargebee.v4.models.virtualBankAccount.VirtualBankAccount;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountDeleteResponse.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountDeleteResponse.java
index 5c31397e..3b6a9c1d 100644
--- a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.virtualBankAccount;
+package com.chargebee.v4.models.virtualBankAccount.responses;
 
-import com.chargebee.v4.core.models.virtualBankAccount.VirtualBankAccount;
+import com.chargebee.v4.models.virtualBankAccount.VirtualBankAccount;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountListResponse.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountListResponse.java
rename to src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountListResponse.java
index 0fc35021..4d4df63a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.virtualBankAccount;
+package com.chargebee.v4.models.virtualBankAccount.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.virtualBankAccount.VirtualBankAccount;
+import com.chargebee.v4.models.virtualBankAccount.VirtualBankAccount;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.VirtualBankAccountService;
-import com.chargebee.v4.core.models.virtualBankAccount.params.VirtualBankAccountListParams;
+import com.chargebee.v4.services.VirtualBankAccountService;
+import com.chargebee.v4.models.virtualBankAccount.params.VirtualBankAccountListParams;
 
 /** Immutable response object for VirtualBankAccountList operation. Contains paginated list data. */
 public final class VirtualBankAccountListResponse {
@@ -99,9 +100,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public VirtualBankAccountListResponse nextPage() throws Exception {
+  public VirtualBankAccountListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountRetrieveResponse.java
new file mode 100644
index 00000000..9e0161ee
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.virtualBankAccount.responses;
+
+import com.chargebee.v4.models.virtualBankAccount.VirtualBankAccount;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for VirtualBankAccountRetrieve operation. Contains the response data
+ * from a single resource get operation.
+ */
+public final class VirtualBankAccountRetrieveResponse extends BaseResponse {
+  private final VirtualBankAccount virtualBankAccount;
+
+  private VirtualBankAccountRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.virtualBankAccount = builder.virtualBankAccount;
+  }
+
+  /** Parse JSON response into VirtualBankAccountRetrieveResponse object. */
+  public static VirtualBankAccountRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into VirtualBankAccountRetrieveResponse object with HTTP response. */
+  public static VirtualBankAccountRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __virtualBankAccountJson = JsonUtil.getObject(json, "virtual_bank_account");
+      if (__virtualBankAccountJson != null) {
+        builder.virtualBankAccount(VirtualBankAccount.fromJson(__virtualBankAccountJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse VirtualBankAccountRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for VirtualBankAccountRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for VirtualBankAccountRetrieveResponse. */
+  public static class Builder {
+
+    private VirtualBankAccount virtualBankAccount;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder virtualBankAccount(VirtualBankAccount virtualBankAccount) {
+      this.virtualBankAccount = virtualBankAccount;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public VirtualBankAccountRetrieveResponse build() {
+      return new VirtualBankAccountRetrieveResponse(this);
+    }
+  }
+
+  /** Get the virtualBankAccount from the response. */
+  public VirtualBankAccount getVirtualBankAccount() {
+    return virtualBankAccount;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountSyncFundResponse.java b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountSyncFundResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountSyncFundResponse.java
rename to src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountSyncFundResponse.java
index 16414833..5f78b7b9 100644
--- a/src/main/java/com/chargebee/v4/core/responses/virtualBankAccount/VirtualBankAccountSyncFundResponse.java
+++ b/src/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountSyncFundResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.virtualBankAccount;
+package com.chargebee.v4.models.virtualBankAccount.responses;
 
-import com.chargebee.v4.core.models.transaction.Transaction;
+import com.chargebee.v4.models.transaction.Transaction;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/WebhookEndpoint.java b/src/main/java/com/chargebee/v4/models/webhookEndpoint/WebhookEndpoint.java
similarity index 98%
rename from src/main/java/com/chargebee/v4/core/models/webhookEndpoint/WebhookEndpoint.java
rename to src/main/java/com/chargebee/v4/models/webhookEndpoint/WebhookEndpoint.java
index 1ba2a568..11087da7 100644
--- a/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/WebhookEndpoint.java
+++ b/src/main/java/com/chargebee/v4/models/webhookEndpoint/WebhookEndpoint.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.webhookEndpoint;
+package com.chargebee.v4.models.webhookEndpoint;
 
 import com.chargebee.v4.internal.JsonUtil;
 import java.util.List;
diff --git a/src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointCreateParams.java b/src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointCreateParams.java
new file mode 100644
index 00000000..34228303
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointCreateParams.java
@@ -0,0 +1,303 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.webhookEndpoint.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class WebhookEndpointCreateParams {
+
+  private final String name;
+
+  private final ApiVersion apiVersion;
+
+  private final String url;
+
+  private final Boolean primaryUrl;
+
+  private final Boolean disabled;
+
+  private final String basicAuthPassword;
+
+  private final String basicAuthUsername;
+
+  private final Boolean sendCardResource;
+
+  private final ChargebeeResponseSchemaType chargebeeResponseSchemaType;
+
+  private final List<String> enabledEvents;
+
+  private WebhookEndpointCreateParams(WebhookEndpointCreateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.apiVersion = builder.apiVersion;
+
+    this.url = builder.url;
+
+    this.primaryUrl = builder.primaryUrl;
+
+    this.disabled = builder.disabled;
+
+    this.basicAuthPassword = builder.basicAuthPassword;
+
+    this.basicAuthUsername = builder.basicAuthUsername;
+
+    this.sendCardResource = builder.sendCardResource;
+
+    this.chargebeeResponseSchemaType = builder.chargebeeResponseSchemaType;
+
+    this.enabledEvents = builder.enabledEvents;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public ApiVersion getApiVersion() {
+    return apiVersion;
+  }
+
+  public String getUrl() {
+    return url;
+  }
+
+  public Boolean getPrimaryUrl() {
+    return primaryUrl;
+  }
+
+  public Boolean getDisabled() {
+    return disabled;
+  }
+
+  public String getBasicAuthPassword() {
+    return basicAuthPassword;
+  }
+
+  public String getBasicAuthUsername() {
+    return basicAuthUsername;
+  }
+
+  public Boolean getSendCardResource() {
+    return sendCardResource;
+  }
+
+  public ChargebeeResponseSchemaType getChargebeeResponseSchemaType() {
+    return chargebeeResponseSchemaType;
+  }
+
+  public List<String> getEnabledEvents() {
+    return enabledEvents;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.apiVersion != null) {
+
+      formData.put("api_version", this.apiVersion);
+    }
+
+    if (this.url != null) {
+
+      formData.put("url", this.url);
+    }
+
+    if (this.primaryUrl != null) {
+
+      formData.put("primary_url", this.primaryUrl);
+    }
+
+    if (this.disabled != null) {
+
+      formData.put("disabled", this.disabled);
+    }
+
+    if (this.basicAuthPassword != null) {
+
+      formData.put("basic_auth_password", this.basicAuthPassword);
+    }
+
+    if (this.basicAuthUsername != null) {
+
+      formData.put("basic_auth_username", this.basicAuthUsername);
+    }
+
+    if (this.sendCardResource != null) {
+
+      formData.put("send_card_resource", this.sendCardResource);
+    }
+
+    if (this.chargebeeResponseSchemaType != null) {
+
+      formData.put("chargebee_response_schema_type", this.chargebeeResponseSchemaType);
+    }
+
+    if (this.enabledEvents != null) {
+
+      formData.put("enabled_events", this.enabledEvents);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for WebhookEndpointCreateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static WebhookEndpointCreateBuilder builder() {
+    return new WebhookEndpointCreateBuilder();
+  }
+
+  public static final class WebhookEndpointCreateBuilder {
+
+    private String name;
+
+    private ApiVersion apiVersion;
+
+    private String url;
+
+    private Boolean primaryUrl;
+
+    private Boolean disabled;
+
+    private String basicAuthPassword;
+
+    private String basicAuthUsername;
+
+    private Boolean sendCardResource;
+
+    private ChargebeeResponseSchemaType chargebeeResponseSchemaType;
+
+    private List<String> enabledEvents;
+
+    private WebhookEndpointCreateBuilder() {}
+
+    public WebhookEndpointCreateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public WebhookEndpointCreateBuilder apiVersion(ApiVersion value) {
+      this.apiVersion = value;
+      return this;
+    }
+
+    public WebhookEndpointCreateBuilder url(String value) {
+      this.url = value;
+      return this;
+    }
+
+    public WebhookEndpointCreateBuilder primaryUrl(Boolean value) {
+      this.primaryUrl = value;
+      return this;
+    }
+
+    public WebhookEndpointCreateBuilder disabled(Boolean value) {
+      this.disabled = value;
+      return this;
+    }
+
+    public WebhookEndpointCreateBuilder basicAuthPassword(String value) {
+      this.basicAuthPassword = value;
+      return this;
+    }
+
+    public WebhookEndpointCreateBuilder basicAuthUsername(String value) {
+      this.basicAuthUsername = value;
+      return this;
+    }
+
+    public WebhookEndpointCreateBuilder sendCardResource(Boolean value) {
+      this.sendCardResource = value;
+      return this;
+    }
+
+    public WebhookEndpointCreateBuilder chargebeeResponseSchemaType(
+        ChargebeeResponseSchemaType value) {
+      this.chargebeeResponseSchemaType = value;
+      return this;
+    }
+
+    public WebhookEndpointCreateBuilder enabledEvents(List<String> value) {
+      this.enabledEvents = value;
+      return this;
+    }
+
+    public WebhookEndpointCreateParams build() {
+      return new WebhookEndpointCreateParams(this);
+    }
+  }
+
+  public enum ApiVersion {
+    V1("v1"),
+
+    V2("v2"),
+
+    /** An enum member indicating that ApiVersion was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ApiVersion(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ApiVersion fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ApiVersion enumValue : ApiVersion.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+
+  public enum ChargebeeResponseSchemaType {
+    PLANS_ADDONS("plans_addons"),
+
+    ITEMS("items"),
+
+    COMPAT("compat"),
+
+    /**
+     * An enum member indicating that ChargebeeResponseSchemaType was instantiated with an unknown
+     * value.
+     */
+    _UNKNOWN(null);
+    private final String value;
+
+    ChargebeeResponseSchemaType(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ChargebeeResponseSchemaType fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ChargebeeResponseSchemaType enumValue : ChargebeeResponseSchemaType.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointDeleteParams.java b/src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointDeleteParams.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointDeleteParams.java
rename to src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointDeleteParams.java
index 9dc04ca8..659f556c 100644
--- a/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointDeleteParams.java
+++ b/src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointDeleteParams.java
@@ -4,24 +4,21 @@
  * Reach out to dx@chargebee.com for any questions.
  * Copyright 2025 Chargebee Inc.
  */
-package com.chargebee.v4.core.models.webhookEndpoint.params;
+package com.chargebee.v4.models.webhookEndpoint.params;
 
 import com.chargebee.v4.internal.Recommended;
 
-import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
 public final class WebhookEndpointDeleteParams {
 
-  private final Map<String, Object> formData;
-
-  private WebhookEndpointDeleteParams(WebhookEndpointDeleteBuilder builder) {
-    this.formData = Collections.unmodifiableMap(new LinkedHashMap<>(builder.formData));
-  }
+  private WebhookEndpointDeleteParams(WebhookEndpointDeleteBuilder builder) {}
 
   /** Get the form data for this request. */
   public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
     return formData;
   }
 
@@ -32,7 +29,6 @@ public static WebhookEndpointDeleteBuilder builder() {
   }
 
   public static final class WebhookEndpointDeleteBuilder {
-    private final Map<String, Object> formData = new LinkedHashMap<>();
 
     private WebhookEndpointDeleteBuilder() {}
 
diff --git a/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointListParams.java b/src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointListParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointListParams.java
rename to src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointListParams.java
index f3bb1e42..bece6751 100644
--- a/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointListParams.java
+++ b/src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointListParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.webhookEndpoint.params;
+package com.chargebee.v4.models.webhookEndpoint.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointRetrieveParams.java b/src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointRetrieveParams.java
similarity index 96%
rename from src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointRetrieveParams.java
rename to src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointRetrieveParams.java
index 5a792121..53ae81f0 100644
--- a/src/main/java/com/chargebee/v4/core/models/webhookEndpoint/params/WebhookEndpointRetrieveParams.java
+++ b/src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointRetrieveParams.java
@@ -5,7 +5,7 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.models.webhookEndpoint.params;
+package com.chargebee.v4.models.webhookEndpoint.params;
 
 import com.chargebee.v4.internal.Recommended;
 
diff --git a/src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointUpdateParams.java b/src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointUpdateParams.java
new file mode 100644
index 00000000..93800f60
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/webhookEndpoint/params/WebhookEndpointUpdateParams.java
@@ -0,0 +1,249 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+package com.chargebee.v4.models.webhookEndpoint.params;
+
+import com.chargebee.v4.internal.Recommended;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.List;
+
+public final class WebhookEndpointUpdateParams {
+
+  private final String name;
+
+  private final ApiVersion apiVersion;
+
+  private final String url;
+
+  private final Boolean primaryUrl;
+
+  private final Boolean sendCardResource;
+
+  private final String basicAuthPassword;
+
+  private final String basicAuthUsername;
+
+  private final Boolean disabled;
+
+  private final List<String> enabledEvents;
+
+  private WebhookEndpointUpdateParams(WebhookEndpointUpdateBuilder builder) {
+
+    this.name = builder.name;
+
+    this.apiVersion = builder.apiVersion;
+
+    this.url = builder.url;
+
+    this.primaryUrl = builder.primaryUrl;
+
+    this.sendCardResource = builder.sendCardResource;
+
+    this.basicAuthPassword = builder.basicAuthPassword;
+
+    this.basicAuthUsername = builder.basicAuthUsername;
+
+    this.disabled = builder.disabled;
+
+    this.enabledEvents = builder.enabledEvents;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public ApiVersion getApiVersion() {
+    return apiVersion;
+  }
+
+  public String getUrl() {
+    return url;
+  }
+
+  public Boolean getPrimaryUrl() {
+    return primaryUrl;
+  }
+
+  public Boolean getSendCardResource() {
+    return sendCardResource;
+  }
+
+  public String getBasicAuthPassword() {
+    return basicAuthPassword;
+  }
+
+  public String getBasicAuthUsername() {
+    return basicAuthUsername;
+  }
+
+  public Boolean getDisabled() {
+    return disabled;
+  }
+
+  public List<String> getEnabledEvents() {
+    return enabledEvents;
+  }
+
+  /** Get the form data for this request. */
+  public Map<String, Object> toFormData() {
+    Map<String, Object> formData = new LinkedHashMap<>();
+
+    if (this.name != null) {
+
+      formData.put("name", this.name);
+    }
+
+    if (this.apiVersion != null) {
+
+      formData.put("api_version", this.apiVersion);
+    }
+
+    if (this.url != null) {
+
+      formData.put("url", this.url);
+    }
+
+    if (this.primaryUrl != null) {
+
+      formData.put("primary_url", this.primaryUrl);
+    }
+
+    if (this.sendCardResource != null) {
+
+      formData.put("send_card_resource", this.sendCardResource);
+    }
+
+    if (this.basicAuthPassword != null) {
+
+      formData.put("basic_auth_password", this.basicAuthPassword);
+    }
+
+    if (this.basicAuthUsername != null) {
+
+      formData.put("basic_auth_username", this.basicAuthUsername);
+    }
+
+    if (this.disabled != null) {
+
+      formData.put("disabled", this.disabled);
+    }
+
+    if (this.enabledEvents != null) {
+
+      formData.put("enabled_events", this.enabledEvents);
+    }
+
+    return formData;
+  }
+
+  /** Create a new builder for WebhookEndpointUpdateParams. */
+  @Recommended(reason = "Preferred for reusability, validation, and LLM-friendliness")
+  public static WebhookEndpointUpdateBuilder builder() {
+    return new WebhookEndpointUpdateBuilder();
+  }
+
+  public static final class WebhookEndpointUpdateBuilder {
+
+    private String name;
+
+    private ApiVersion apiVersion;
+
+    private String url;
+
+    private Boolean primaryUrl;
+
+    private Boolean sendCardResource;
+
+    private String basicAuthPassword;
+
+    private String basicAuthUsername;
+
+    private Boolean disabled;
+
+    private List<String> enabledEvents;
+
+    private WebhookEndpointUpdateBuilder() {}
+
+    public WebhookEndpointUpdateBuilder name(String value) {
+      this.name = value;
+      return this;
+    }
+
+    public WebhookEndpointUpdateBuilder apiVersion(ApiVersion value) {
+      this.apiVersion = value;
+      return this;
+    }
+
+    public WebhookEndpointUpdateBuilder url(String value) {
+      this.url = value;
+      return this;
+    }
+
+    public WebhookEndpointUpdateBuilder primaryUrl(Boolean value) {
+      this.primaryUrl = value;
+      return this;
+    }
+
+    public WebhookEndpointUpdateBuilder sendCardResource(Boolean value) {
+      this.sendCardResource = value;
+      return this;
+    }
+
+    public WebhookEndpointUpdateBuilder basicAuthPassword(String value) {
+      this.basicAuthPassword = value;
+      return this;
+    }
+
+    public WebhookEndpointUpdateBuilder basicAuthUsername(String value) {
+      this.basicAuthUsername = value;
+      return this;
+    }
+
+    public WebhookEndpointUpdateBuilder disabled(Boolean value) {
+      this.disabled = value;
+      return this;
+    }
+
+    public WebhookEndpointUpdateBuilder enabledEvents(List<String> value) {
+      this.enabledEvents = value;
+      return this;
+    }
+
+    public WebhookEndpointUpdateParams build() {
+      return new WebhookEndpointUpdateParams(this);
+    }
+  }
+
+  public enum ApiVersion {
+    V1("v1"),
+
+    V2("v2"),
+
+    /** An enum member indicating that ApiVersion was instantiated with an unknown value. */
+    _UNKNOWN(null);
+    private final String value;
+
+    ApiVersion(String value) {
+      this.value = value;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public static ApiVersion fromString(String value) {
+      if (value == null) return _UNKNOWN;
+      for (ApiVersion enumValue : ApiVersion.values()) {
+        if (enumValue.value != null && enumValue.value.equals(value)) {
+          return enumValue;
+        }
+      }
+      return _UNKNOWN;
+    }
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointCreateResponse.java b/src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointCreateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointCreateResponse.java
rename to src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointCreateResponse.java
index e60895b1..54af1da8 100644
--- a/src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointCreateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointCreateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.webhookEndpoint;
+package com.chargebee.v4.models.webhookEndpoint.responses;
 
-import com.chargebee.v4.core.models.webhookEndpoint.WebhookEndpoint;
+import com.chargebee.v4.models.webhookEndpoint.WebhookEndpoint;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointDeleteResponse.java b/src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointDeleteResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointDeleteResponse.java
rename to src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointDeleteResponse.java
index 3248716e..6d2e4511 100644
--- a/src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointDeleteResponse.java
+++ b/src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointDeleteResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.webhookEndpoint;
+package com.chargebee.v4.models.webhookEndpoint.responses;
 
-import com.chargebee.v4.core.models.webhookEndpoint.WebhookEndpoint;
+import com.chargebee.v4.models.webhookEndpoint.WebhookEndpoint;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointListResponse.java b/src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointListResponse.java
similarity index 91%
rename from src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointListResponse.java
rename to src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointListResponse.java
index 59102e28..cb3157a5 100644
--- a/src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointListResponse.java
+++ b/src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointListResponse.java
@@ -1,13 +1,14 @@
-package com.chargebee.v4.core.responses.webhookEndpoint;
+package com.chargebee.v4.models.webhookEndpoint.responses;
 
 import java.util.List;
 
-import com.chargebee.v4.core.models.webhookEndpoint.WebhookEndpoint;
+import com.chargebee.v4.models.webhookEndpoint.WebhookEndpoint;
 
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
-import com.chargebee.v4.core.services.WebhookEndpointService;
-import com.chargebee.v4.core.models.webhookEndpoint.params.WebhookEndpointListParams;
+import com.chargebee.v4.services.WebhookEndpointService;
+import com.chargebee.v4.models.webhookEndpoint.params.WebhookEndpointListParams;
 
 /** Immutable response object for WebhookEndpointList operation. Contains paginated list data. */
 public final class WebhookEndpointListResponse {
@@ -99,9 +100,9 @@ public boolean hasNextPage() {
   /**
    * Get the next page of results.
    *
-   * @throws Exception if unable to fetch next page
+   * @throws ChargebeeException if unable to fetch next page
    */
-  public WebhookEndpointListResponse nextPage() throws Exception {
+  public WebhookEndpointListResponse nextPage() throws ChargebeeException {
     if (!hasNextPage()) {
       throw new IllegalStateException("No more pages available");
     }
diff --git a/src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointRetrieveResponse.java b/src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointRetrieveResponse.java
new file mode 100644
index 00000000..934be825
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointRetrieveResponse.java
@@ -0,0 +1,77 @@
+package com.chargebee.v4.models.webhookEndpoint.responses;
+
+import com.chargebee.v4.models.webhookEndpoint.WebhookEndpoint;
+
+import com.chargebee.v4.models.BaseResponse;
+import com.chargebee.v4.internal.JsonUtil;
+import com.chargebee.v4.transport.Response;
+
+/**
+ * Immutable response object for WebhookEndpointRetrieve operation. Contains the response data from
+ * a single resource get operation.
+ */
+public final class WebhookEndpointRetrieveResponse extends BaseResponse {
+  private final WebhookEndpoint webhookEndpoint;
+
+  private WebhookEndpointRetrieveResponse(Builder builder) {
+    super(builder.httpResponse);
+
+    this.webhookEndpoint = builder.webhookEndpoint;
+  }
+
+  /** Parse JSON response into WebhookEndpointRetrieveResponse object. */
+  public static WebhookEndpointRetrieveResponse fromJson(String json) {
+    return fromJson(json, null);
+  }
+
+  /** Parse JSON response into WebhookEndpointRetrieveResponse object with HTTP response. */
+  public static WebhookEndpointRetrieveResponse fromJson(String json, Response httpResponse) {
+    try {
+      Builder builder = builder();
+
+      String __webhookEndpointJson = JsonUtil.getObject(json, "webhook_endpoint");
+      if (__webhookEndpointJson != null) {
+        builder.webhookEndpoint(WebhookEndpoint.fromJson(__webhookEndpointJson));
+      }
+
+      builder.httpResponse(httpResponse);
+      return builder.build();
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to parse WebhookEndpointRetrieveResponse from JSON", e);
+    }
+  }
+
+  /** Create a new builder for WebhookEndpointRetrieveResponse. */
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  /** Builder for WebhookEndpointRetrieveResponse. */
+  public static class Builder {
+
+    private WebhookEndpoint webhookEndpoint;
+
+    private Response httpResponse;
+
+    private Builder() {}
+
+    public Builder webhookEndpoint(WebhookEndpoint webhookEndpoint) {
+      this.webhookEndpoint = webhookEndpoint;
+      return this;
+    }
+
+    public Builder httpResponse(Response httpResponse) {
+      this.httpResponse = httpResponse;
+      return this;
+    }
+
+    public WebhookEndpointRetrieveResponse build() {
+      return new WebhookEndpointRetrieveResponse(this);
+    }
+  }
+
+  /** Get the webhookEndpoint from the response. */
+  public WebhookEndpoint getWebhookEndpoint() {
+    return webhookEndpoint;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointUpdateResponse.java b/src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointUpdateResponse.java
similarity index 92%
rename from src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointUpdateResponse.java
rename to src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointUpdateResponse.java
index 91ae6310..0392b53a 100644
--- a/src/main/java/com/chargebee/v4/core/responses/webhookEndpoint/WebhookEndpointUpdateResponse.java
+++ b/src/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointUpdateResponse.java
@@ -1,8 +1,8 @@
-package com.chargebee.v4.core.responses.webhookEndpoint;
+package com.chargebee.v4.models.webhookEndpoint.responses;
 
-import com.chargebee.v4.core.models.webhookEndpoint.WebhookEndpoint;
+import com.chargebee.v4.models.webhookEndpoint.WebhookEndpoint;
 
-import com.chargebee.v4.core.responses.BaseResponse;
+import com.chargebee.v4.models.BaseResponse;
 import com.chargebee.v4.internal.JsonUtil;
 import com.chargebee.v4.transport.Response;
 
diff --git a/src/main/java/com/chargebee/v4/core/services/AdditionalBillingLogiqService.java b/src/main/java/com/chargebee/v4/services/AdditionalBillingLogiqService.java
similarity index 82%
rename from src/main/java/com/chargebee/v4/core/services/AdditionalBillingLogiqService.java
rename to src/main/java/com/chargebee/v4/services/AdditionalBillingLogiqService.java
index 2cec45e8..e493a30d 100644
--- a/src/main/java/com/chargebee/v4/core/services/AdditionalBillingLogiqService.java
+++ b/src/main/java/com/chargebee/v4/services/AdditionalBillingLogiqService.java
@@ -5,15 +5,16 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.additionalBillingLogiq.params.AdditionalBillingLogiqRetrieveParams;
+import com.chargebee.v4.models.additionalBillingLogiq.params.AdditionalBillingLogiqRetrieveParams;
 
-import com.chargebee.v4.core.responses.additionalBillingLogiq.AdditionalBillingLogiqRetrieveResponse;
+import com.chargebee.v4.models.additionalBillingLogiq.responses.AdditionalBillingLogiqRetrieveResponse;
 
 public final class AdditionalBillingLogiqService
     extends BaseService<AdditionalBillingLogiqService> {
@@ -55,7 +56,7 @@ public AdditionalBillingLogiqService withOptions(RequestOptions options) {
    * retrieve a additionalBillingLogiq using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveRaw(AdditionalBillingLogiqRetrieveParams params) throws Exception {
+  Response retrieveRaw(AdditionalBillingLogiqRetrieveParams params) throws ChargebeeException {
 
     return get("/additional_billing_logiqs", params != null ? params.toQueryParams() : null);
   }
@@ -64,13 +65,13 @@ Response retrieveRaw(AdditionalBillingLogiqRetrieveParams params) throws Excepti
    * retrieve a additionalBillingLogiq using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveRaw(String jsonPayload) throws Exception {
+  Response retrieveRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public AdditionalBillingLogiqRetrieveResponse retrieve(
-      AdditionalBillingLogiqRetrieveParams params) throws Exception {
+      AdditionalBillingLogiqRetrieveParams params) throws ChargebeeException {
     Response response = retrieveRaw(params);
 
     return AdditionalBillingLogiqRetrieveResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/services/AddonService.java b/src/main/java/com/chargebee/v4/services/AddonService.java
new file mode 100644
index 00000000..483f1da2
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/AddonService.java
@@ -0,0 +1,196 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.addon.params.AddonCopyParams;
+
+import com.chargebee.v4.models.addon.params.AddonUpdateParams;
+
+import com.chargebee.v4.models.addon.params.AddonListParams;
+
+import com.chargebee.v4.models.addon.params.AddonCreateParams;
+
+import com.chargebee.v4.models.addon.responses.AddonCopyResponse;
+
+import com.chargebee.v4.models.addon.responses.AddonUnarchiveResponse;
+
+import com.chargebee.v4.models.addon.responses.AddonRetrieveResponse;
+
+import com.chargebee.v4.models.addon.responses.AddonUpdateResponse;
+
+import com.chargebee.v4.models.addon.responses.AddonListResponse;
+
+import com.chargebee.v4.models.addon.responses.AddonCreateResponse;
+
+import com.chargebee.v4.models.addon.responses.AddonDeleteResponse;
+
+public final class AddonService extends BaseService<AddonService> {
+
+  private final ServiceConfig config;
+
+  public AddonService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private AddonService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private AddonService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  AddonService with(RequestOptions newOptions) {
+    return new AddonService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public AddonService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** copy a addon using immutable params (executes immediately) - returns raw Response. */
+  Response copyRaw(AddonCopyParams params) throws ChargebeeException {
+
+    return post("/addons/copy", params != null ? params.toFormData() : null);
+  }
+
+  /** copy a addon using raw JSON payload (executes immediately) - returns raw Response. */
+  Response copyRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/addons/copy", jsonPayload);
+  }
+
+  public AddonCopyResponse copy(AddonCopyParams params) throws ChargebeeException {
+    Response response = copyRaw(params);
+
+    return AddonCopyResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** unarchive a addon (executes immediately) - returns raw Response. */
+  Response unarchiveRaw(String addonId) throws ChargebeeException {
+    String path = buildPathWithParams("/addons/{addon-id}/unarchive", "addon-id", addonId);
+
+    return post(path, null);
+  }
+
+  public AddonUnarchiveResponse unarchive(String addonId) throws ChargebeeException {
+    Response response = unarchiveRaw(addonId);
+    return AddonUnarchiveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a addon (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String addonId) throws ChargebeeException {
+    String path = buildPathWithParams("/addons/{addon-id}", "addon-id", addonId);
+
+    return get(path, null);
+  }
+
+  public AddonRetrieveResponse retrieve(String addonId) throws ChargebeeException {
+    Response response = retrieveRaw(addonId);
+    return AddonRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** update a addon (executes immediately) - returns raw Response. */
+  Response updateRaw(String addonId) throws ChargebeeException {
+    String path = buildPathWithParams("/addons/{addon-id}", "addon-id", addonId);
+
+    return post(path, null);
+  }
+
+  /** update a addon using immutable params (executes immediately) - returns raw Response. */
+  Response updateRaw(String addonId, AddonUpdateParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/addons/{addon-id}", "addon-id", addonId);
+    return post(path, params.toFormData());
+  }
+
+  /** update a addon using raw JSON payload (executes immediately) - returns raw Response. */
+  Response updateRaw(String addonId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/addons/{addon-id}", "addon-id", addonId);
+    return postJson(path, jsonPayload);
+  }
+
+  public AddonUpdateResponse update(String addonId, AddonUpdateParams params)
+      throws ChargebeeException {
+    Response response = updateRaw(addonId, params);
+    return AddonUpdateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** list a addon using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(AddonListParams params) throws ChargebeeException {
+
+    return get("/addons", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a addon without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/addons", null);
+  }
+
+  /** list a addon using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public AddonListResponse list(AddonListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return AddonListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public AddonListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return AddonListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** create a addon using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(AddonCreateParams params) throws ChargebeeException {
+
+    return post("/addons", params != null ? params.toFormData() : null);
+  }
+
+  /** create a addon using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/addons", jsonPayload);
+  }
+
+  public AddonCreateResponse create(AddonCreateParams params) throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return AddonCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** delete a addon (executes immediately) - returns raw Response. */
+  Response deleteRaw(String addonId) throws ChargebeeException {
+    String path = buildPathWithParams("/addons/{addon-id}/delete", "addon-id", addonId);
+
+    return post(path, null);
+  }
+
+  public AddonDeleteResponse delete(String addonId) throws ChargebeeException {
+    Response response = deleteRaw(addonId);
+    return AddonDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/AddressService.java b/src/main/java/com/chargebee/v4/services/AddressService.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/services/AddressService.java
rename to src/main/java/com/chargebee/v4/services/AddressService.java
index 9d6e8e60..dd8de8df 100644
--- a/src/main/java/com/chargebee/v4/core/services/AddressService.java
+++ b/src/main/java/com/chargebee/v4/services/AddressService.java
@@ -5,19 +5,20 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.address.params.AddressRetrieveParams;
+import com.chargebee.v4.models.address.params.AddressRetrieveParams;
 
-import com.chargebee.v4.core.models.address.params.AddressUpdateParams;
+import com.chargebee.v4.models.address.params.AddressUpdateParams;
 
-import com.chargebee.v4.core.responses.address.AddressRetrieveResponse;
+import com.chargebee.v4.models.address.responses.AddressRetrieveResponse;
 
-import com.chargebee.v4.core.responses.address.AddressUpdateResponse;
+import com.chargebee.v4.models.address.responses.AddressUpdateResponse;
 
 public final class AddressService extends BaseService<AddressService> {
 
@@ -54,36 +55,36 @@ public AddressService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** retrieve a address using immutable params (executes immediately) - returns raw Response. */
-  Response retrieveRaw(AddressRetrieveParams params) throws Exception {
+  Response retrieveRaw(AddressRetrieveParams params) throws ChargebeeException {
 
     return get("/addresses", params != null ? params.toQueryParams() : null);
   }
 
   /** retrieve a address using raw JSON payload (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String jsonPayload) throws Exception {
+  Response retrieveRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public AddressRetrieveResponse retrieve(AddressRetrieveParams params) throws Exception {
+  public AddressRetrieveResponse retrieve(AddressRetrieveParams params) throws ChargebeeException {
     Response response = retrieveRaw(params);
 
     return AddressRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a address using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(AddressUpdateParams params) throws Exception {
+  Response updateRaw(AddressUpdateParams params) throws ChargebeeException {
 
     return post("/addresses", params != null ? params.toFormData() : null);
   }
 
   /** update a address using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String jsonPayload) throws Exception {
+  Response updateRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/addresses", jsonPayload);
   }
 
-  public AddressUpdateResponse update(AddressUpdateParams params) throws Exception {
+  public AddressUpdateResponse update(AddressUpdateParams params) throws ChargebeeException {
     Response response = updateRaw(params);
 
     return AddressUpdateResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/services/AttachedItemService.java b/src/main/java/com/chargebee/v4/services/AttachedItemService.java
new file mode 100644
index 00000000..81c197e3
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/AttachedItemService.java
@@ -0,0 +1,220 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.attachedItem.params.AttachedItemRetrieveParams;
+
+import com.chargebee.v4.models.attachedItem.params.AttachedItemUpdateParams;
+
+import com.chargebee.v4.models.attachedItem.params.AttachedItemListParams;
+
+import com.chargebee.v4.models.attachedItem.params.AttachedItemCreateParams;
+
+import com.chargebee.v4.models.attachedItem.params.AttachedItemDeleteParams;
+
+import com.chargebee.v4.models.attachedItem.responses.AttachedItemRetrieveResponse;
+
+import com.chargebee.v4.models.attachedItem.responses.AttachedItemUpdateResponse;
+
+import com.chargebee.v4.models.attachedItem.responses.AttachedItemListResponse;
+
+import com.chargebee.v4.models.attachedItem.responses.AttachedItemCreateResponse;
+
+import com.chargebee.v4.models.attachedItem.responses.AttachedItemDeleteResponse;
+
+public final class AttachedItemService extends BaseService<AttachedItemService> {
+
+  private final ServiceConfig config;
+
+  public AttachedItemService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private AttachedItemService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private AttachedItemService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  AttachedItemService with(RequestOptions newOptions) {
+    return new AttachedItemService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public AttachedItemService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** retrieve a attachedItem (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String attachedItemId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/attached_items/{attached-item-id}", "attached-item-id", attachedItemId);
+
+    return get(path, null);
+  }
+
+  /**
+   * retrieve a attachedItem using immutable params (executes immediately) - returns raw Response.
+   */
+  Response retrieveRaw(String attachedItemId, AttachedItemRetrieveParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/attached_items/{attached-item-id}", "attached-item-id", attachedItemId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  public AttachedItemRetrieveResponse retrieve(
+      String attachedItemId, AttachedItemRetrieveParams params) throws ChargebeeException {
+    Response response = retrieveRaw(attachedItemId, params);
+    return AttachedItemRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  public AttachedItemRetrieveResponse retrieve(String attachedItemId) throws ChargebeeException {
+    Response response = retrieveRaw(attachedItemId);
+    return AttachedItemRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** update a attachedItem (executes immediately) - returns raw Response. */
+  Response updateRaw(String attachedItemId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/attached_items/{attached-item-id}", "attached-item-id", attachedItemId);
+
+    return post(path, null);
+  }
+
+  /** update a attachedItem using immutable params (executes immediately) - returns raw Response. */
+  Response updateRaw(String attachedItemId, AttachedItemUpdateParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/attached_items/{attached-item-id}", "attached-item-id", attachedItemId);
+    return post(path, params.toFormData());
+  }
+
+  /** update a attachedItem using raw JSON payload (executes immediately) - returns raw Response. */
+  Response updateRaw(String attachedItemId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/attached_items/{attached-item-id}", "attached-item-id", attachedItemId);
+    return postJson(path, jsonPayload);
+  }
+
+  public AttachedItemUpdateResponse update(String attachedItemId, AttachedItemUpdateParams params)
+      throws ChargebeeException {
+    Response response = updateRaw(attachedItemId, params);
+    return AttachedItemUpdateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** list a attachedItem using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(String itemId, AttachedItemListParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/attached_items", "item-id", itemId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a attachedItem without params (executes immediately) - returns raw Response. */
+  Response listRaw(String itemId) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/attached_items", "item-id", itemId);
+    return get(path, null);
+  }
+
+  /** list a attachedItem using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String itemId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/attached_items", "item-id", itemId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public AttachedItemListResponse list(String itemId, AttachedItemListParams params)
+      throws ChargebeeException {
+    Response response = listRaw(itemId, params);
+    return AttachedItemListResponse.fromJson(
+        response.getBodyAsString(), this, params, itemId, response);
+  }
+
+  public AttachedItemListResponse list(String itemId) throws ChargebeeException {
+    Response response = listRaw(itemId);
+    return AttachedItemListResponse.fromJson(
+        response.getBodyAsString(), this, null, itemId, response);
+  }
+
+  /** create a attachedItem (executes immediately) - returns raw Response. */
+  Response createRaw(String itemId) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/attached_items", "item-id", itemId);
+
+    return post(path, null);
+  }
+
+  /** create a attachedItem using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(String itemId, AttachedItemCreateParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/attached_items", "item-id", itemId);
+    return post(path, params.toFormData());
+  }
+
+  /** create a attachedItem using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String itemId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/attached_items", "item-id", itemId);
+    return postJson(path, jsonPayload);
+  }
+
+  public AttachedItemCreateResponse create(String itemId, AttachedItemCreateParams params)
+      throws ChargebeeException {
+    Response response = createRaw(itemId, params);
+    return AttachedItemCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** delete a attachedItem (executes immediately) - returns raw Response. */
+  Response deleteRaw(String attachedItemId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/attached_items/{attached-item-id}/delete", "attached-item-id", attachedItemId);
+
+    return post(path, null);
+  }
+
+  /** delete a attachedItem using immutable params (executes immediately) - returns raw Response. */
+  Response deleteRaw(String attachedItemId, AttachedItemDeleteParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/attached_items/{attached-item-id}/delete", "attached-item-id", attachedItemId);
+    return post(path, params.toFormData());
+  }
+
+  /** delete a attachedItem using raw JSON payload (executes immediately) - returns raw Response. */
+  Response deleteRaw(String attachedItemId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/attached_items/{attached-item-id}/delete", "attached-item-id", attachedItemId);
+    return postJson(path, jsonPayload);
+  }
+
+  public AttachedItemDeleteResponse delete(String attachedItemId, AttachedItemDeleteParams params)
+      throws ChargebeeException {
+    Response response = deleteRaw(attachedItemId, params);
+    return AttachedItemDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/BaseService.java b/src/main/java/com/chargebee/v4/services/BaseService.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/services/BaseService.java
rename to src/main/java/com/chargebee/v4/services/BaseService.java
index e5ddcf48..d8f2a1cd 100644
--- a/src/main/java/com/chargebee/v4/core/services/BaseService.java
+++ b/src/main/java/com/chargebee/v4/services/BaseService.java
@@ -1,8 +1,9 @@
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.request.RequestContext;
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Request;
 import com.chargebee.v4.transport.Response;
 import com.chargebee.v4.transport.UrlBuilder;
@@ -97,7 +98,7 @@ protected Object clientForBuilders() {
     /**
      * Helper: POST with optional headers.
      */
-    protected Response post(String path, Map<String, Object> formData) throws Exception {
+    protected Response post(String path, Map<String, Object> formData) throws ChargebeeException {
         String fullUrl = UrlBuilder.buildUrl(client.getBaseUrl(), path, null);
         Request.Builder builder = Request.builder()
                 .method("POST")
@@ -110,7 +111,7 @@ protected Response post(String path, Map<String, Object> formData) throws Except
     /**
      * Helper: POST JSON with optional headers.
      */
-    protected Response postJson(String path, String jsonData) throws Exception {
+    protected Response postJson(String path, String jsonData) throws ChargebeeException {
         String fullUrl = UrlBuilder.buildUrl(client.getBaseUrl(), path, null);
         Request.Builder builder = Request.builder()
                 .method("POST")
@@ -173,7 +174,7 @@ protected <R> R parseResponse(Response response, Class<R> responseClass) {
     /**
      * GET with Object query parameters.
      */
-    protected Response get(String path, Map<String, Object> queryParams) throws Exception {
+    protected Response get(String path, Map<String, Object> queryParams) throws ChargebeeException {
         String fullUrl = UrlBuilder.buildUrl(client.getBaseUrl(), path, queryParams);
         Request.Builder builder = Request.builder()
                 .method("GET")
diff --git a/src/main/java/com/chargebee/v4/core/services/BrandConfigurationService.java b/src/main/java/com/chargebee/v4/services/BrandConfigurationService.java
similarity index 84%
rename from src/main/java/com/chargebee/v4/core/services/BrandConfigurationService.java
rename to src/main/java/com/chargebee/v4/services/BrandConfigurationService.java
index 2237295c..d9794724 100644
--- a/src/main/java/com/chargebee/v4/core/services/BrandConfigurationService.java
+++ b/src/main/java/com/chargebee/v4/services/BrandConfigurationService.java
@@ -5,15 +5,16 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.brandConfiguration.params.BrandConfigurationRetrieveParams;
+import com.chargebee.v4.models.brandConfiguration.params.BrandConfigurationRetrieveParams;
 
-import com.chargebee.v4.core.responses.brandConfiguration.BrandConfigurationRetrieveResponse;
+import com.chargebee.v4.models.brandConfiguration.responses.BrandConfigurationRetrieveResponse;
 
 public final class BrandConfigurationService extends BaseService<BrandConfigurationService> {
 
@@ -54,7 +55,7 @@ public BrandConfigurationService withOptions(RequestOptions options) {
    * retrieve a brandConfiguration using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveRaw(BrandConfigurationRetrieveParams params) throws Exception {
+  Response retrieveRaw(BrandConfigurationRetrieveParams params) throws ChargebeeException {
 
     return get("/brand_configurations", params != null ? params.toQueryParams() : null);
   }
@@ -63,13 +64,13 @@ Response retrieveRaw(BrandConfigurationRetrieveParams params) throws Exception {
    * retrieve a brandConfiguration using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveRaw(String jsonPayload) throws Exception {
+  Response retrieveRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public BrandConfigurationRetrieveResponse retrieve(BrandConfigurationRetrieveParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = retrieveRaw(params);
 
     return BrandConfigurationRetrieveResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/core/services/BusinessEntityService.java b/src/main/java/com/chargebee/v4/services/BusinessEntityService.java
similarity index 78%
rename from src/main/java/com/chargebee/v4/core/services/BusinessEntityService.java
rename to src/main/java/com/chargebee/v4/services/BusinessEntityService.java
index 71643a46..fef0494a 100644
--- a/src/main/java/com/chargebee/v4/core/services/BusinessEntityService.java
+++ b/src/main/java/com/chargebee/v4/services/BusinessEntityService.java
@@ -5,19 +5,20 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.businessEntity.params.BusinessEntityGetTransfersParams;
+import com.chargebee.v4.models.businessEntity.params.BusinessEntityGetTransfersParams;
 
-import com.chargebee.v4.core.models.businessEntity.params.BusinessEntityCreateTransfersParams;
+import com.chargebee.v4.models.businessEntity.params.BusinessEntityCreateTransfersParams;
 
-import com.chargebee.v4.core.responses.businessEntity.BusinessEntityGetTransfersResponse;
+import com.chargebee.v4.models.businessEntity.responses.BusinessEntityGetTransfersResponse;
 
-import com.chargebee.v4.core.responses.businessEntity.BusinessEntityCreateTransfersResponse;
+import com.chargebee.v4.models.businessEntity.responses.BusinessEntityCreateTransfersResponse;
 
 public final class BusinessEntityService extends BaseService<BusinessEntityService> {
 
@@ -58,13 +59,13 @@ public BusinessEntityService withOptions(RequestOptions options) {
    * getTransfers a businessEntity using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response getTransfersRaw(BusinessEntityGetTransfersParams params) throws Exception {
+  Response getTransfersRaw(BusinessEntityGetTransfersParams params) throws ChargebeeException {
 
     return get("/business_entities/transfers", params != null ? params.toQueryParams() : null);
   }
 
   /** getTransfers a businessEntity without params (executes immediately) - returns raw Response. */
-  Response getTransfersRaw() throws Exception {
+  Response getTransfersRaw() throws ChargebeeException {
 
     return get("/business_entities/transfers", null);
   }
@@ -73,20 +74,20 @@ Response getTransfersRaw() throws Exception {
    * getTransfers a businessEntity using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response getTransfersRaw(String jsonPayload) throws Exception {
+  Response getTransfersRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public BusinessEntityGetTransfersResponse getTransfers(BusinessEntityGetTransfersParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = getTransfersRaw(params);
 
     return BusinessEntityGetTransfersResponse.fromJson(
         response.getBodyAsString(), this, params, response);
   }
 
-  public BusinessEntityGetTransfersResponse getTransfers() throws Exception {
+  public BusinessEntityGetTransfersResponse getTransfers() throws ChargebeeException {
     Response response = getTransfersRaw();
     return BusinessEntityGetTransfersResponse.fromJson(
         response.getBodyAsString(), this, null, response);
@@ -96,7 +97,8 @@ public BusinessEntityGetTransfersResponse getTransfers() throws Exception {
    * createTransfers a businessEntity using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response createTransfersRaw(BusinessEntityCreateTransfersParams params) throws Exception {
+  Response createTransfersRaw(BusinessEntityCreateTransfersParams params)
+      throws ChargebeeException {
 
     return post("/business_entities/transfers", params != null ? params.toFormData() : null);
   }
@@ -105,13 +107,13 @@ Response createTransfersRaw(BusinessEntityCreateTransfersParams params) throws E
    * createTransfers a businessEntity using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response createTransfersRaw(String jsonPayload) throws Exception {
+  Response createTransfersRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/business_entities/transfers", jsonPayload);
   }
 
   public BusinessEntityCreateTransfersResponse createTransfers(
-      BusinessEntityCreateTransfersParams params) throws Exception {
+      BusinessEntityCreateTransfersParams params) throws ChargebeeException {
     Response response = createTransfersRaw(params);
 
     return BusinessEntityCreateTransfersResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/core/services/BusinessProfileService.java b/src/main/java/com/chargebee/v4/services/BusinessProfileService.java
similarity index 84%
rename from src/main/java/com/chargebee/v4/core/services/BusinessProfileService.java
rename to src/main/java/com/chargebee/v4/services/BusinessProfileService.java
index a96fd893..65cea03d 100644
--- a/src/main/java/com/chargebee/v4/core/services/BusinessProfileService.java
+++ b/src/main/java/com/chargebee/v4/services/BusinessProfileService.java
@@ -5,15 +5,16 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.businessProfile.params.BusinessProfileRetrieveParams;
+import com.chargebee.v4.models.businessProfile.params.BusinessProfileRetrieveParams;
 
-import com.chargebee.v4.core.responses.businessProfile.BusinessProfileRetrieveResponse;
+import com.chargebee.v4.models.businessProfile.responses.BusinessProfileRetrieveResponse;
 
 public final class BusinessProfileService extends BaseService<BusinessProfileService> {
 
@@ -54,7 +55,7 @@ public BusinessProfileService withOptions(RequestOptions options) {
    * retrieve a businessProfile using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveRaw(BusinessProfileRetrieveParams params) throws Exception {
+  Response retrieveRaw(BusinessProfileRetrieveParams params) throws ChargebeeException {
 
     return get("/business_profiles", params != null ? params.toQueryParams() : null);
   }
@@ -63,13 +64,13 @@ Response retrieveRaw(BusinessProfileRetrieveParams params) throws Exception {
    * retrieve a businessProfile using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveRaw(String jsonPayload) throws Exception {
+  Response retrieveRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public BusinessProfileRetrieveResponse retrieve(BusinessProfileRetrieveParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = retrieveRaw(params);
 
     return BusinessProfileRetrieveResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/services/CardService.java b/src/main/java/com/chargebee/v4/services/CardService.java
new file mode 100644
index 00000000..7df2fa95
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/CardService.java
@@ -0,0 +1,197 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.card.params.CopyCardForCustomerParams;
+
+import com.chargebee.v4.models.card.params.CardSwitchGatewayForCustomerParams;
+
+import com.chargebee.v4.models.card.params.UpdateCardForCustomerParams;
+
+import com.chargebee.v4.models.card.responses.CopyCardForCustomerResponse;
+
+import com.chargebee.v4.models.card.responses.CardRetrieveResponse;
+
+import com.chargebee.v4.models.card.responses.CardSwitchGatewayForCustomerResponse;
+
+import com.chargebee.v4.models.card.responses.DeleteCardForCustomerResponse;
+
+import com.chargebee.v4.models.card.responses.UpdateCardForCustomerResponse;
+
+public final class CardService extends BaseService<CardService> {
+
+  private final ServiceConfig config;
+
+  public CardService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private CardService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private CardService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  CardService with(RequestOptions newOptions) {
+    return new CardService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public CardService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** copyCardForCustomer a card (executes immediately) - returns raw Response. */
+  Response copyCardForCustomerRaw(String customerId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/copy_card", "customer-id", customerId);
+
+    return post(path, null);
+  }
+
+  /**
+   * copyCardForCustomer a card using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response copyCardForCustomerRaw(String customerId, CopyCardForCustomerParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/copy_card", "customer-id", customerId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * copyCardForCustomer a card using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response copyCardForCustomerRaw(String customerId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/copy_card", "customer-id", customerId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CopyCardForCustomerResponse copyCardForCustomer(
+      String customerId, CopyCardForCustomerParams params) throws ChargebeeException {
+    Response response = copyCardForCustomerRaw(customerId, params);
+    return CopyCardForCustomerResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a card (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String customerId) throws ChargebeeException {
+    String path = buildPathWithParams("/cards/{customer-id}", "customer-id", customerId);
+
+    return get(path, null);
+  }
+
+  public CardRetrieveResponse retrieve(String customerId) throws ChargebeeException {
+    Response response = retrieveRaw(customerId);
+    return CardRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** switchGatewayForCustomer a card (executes immediately) - returns raw Response. */
+  Response switchGatewayForCustomerRaw(String customerId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/switch_gateway", "customer-id", customerId);
+
+    return post(path, null);
+  }
+
+  /**
+   * switchGatewayForCustomer a card using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response switchGatewayForCustomerRaw(String customerId, CardSwitchGatewayForCustomerParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/switch_gateway", "customer-id", customerId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * switchGatewayForCustomer a card using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response switchGatewayForCustomerRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/switch_gateway", "customer-id", customerId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CardSwitchGatewayForCustomerResponse switchGatewayForCustomer(
+      String customerId, CardSwitchGatewayForCustomerParams params) throws ChargebeeException {
+    Response response = switchGatewayForCustomerRaw(customerId, params);
+    return CardSwitchGatewayForCustomerResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** deleteCardForCustomer a card (executes immediately) - returns raw Response. */
+  Response deleteCardForCustomerRaw(String customerId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/delete_card", "customer-id", customerId);
+
+    return post(path, null);
+  }
+
+  public DeleteCardForCustomerResponse deleteCardForCustomer(String customerId)
+      throws ChargebeeException {
+    Response response = deleteCardForCustomerRaw(customerId);
+    return DeleteCardForCustomerResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** updateCardForCustomer a card (executes immediately) - returns raw Response. */
+  Response updateCardForCustomerRaw(String customerId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/credit_card", "customer-id", customerId);
+
+    return post(path, null);
+  }
+
+  /**
+   * updateCardForCustomer a card using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response updateCardForCustomerRaw(String customerId, UpdateCardForCustomerParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/credit_card", "customer-id", customerId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * updateCardForCustomer a card using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response updateCardForCustomerRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/credit_card", "customer-id", customerId);
+    return postJson(path, jsonPayload);
+  }
+
+  public UpdateCardForCustomerResponse updateCardForCustomer(
+      String customerId, UpdateCardForCustomerParams params) throws ChargebeeException {
+    Response response = updateCardForCustomerRaw(customerId, params);
+    return UpdateCardForCustomerResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/CommentService.java b/src/main/java/com/chargebee/v4/services/CommentService.java
new file mode 100644
index 00000000..19c69d32
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/CommentService.java
@@ -0,0 +1,131 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.comment.params.CommentListParams;
+
+import com.chargebee.v4.models.comment.params.CommentCreateParams;
+
+import com.chargebee.v4.models.comment.responses.CommentDeleteResponse;
+
+import com.chargebee.v4.models.comment.responses.CommentRetrieveResponse;
+
+import com.chargebee.v4.models.comment.responses.CommentListResponse;
+
+import com.chargebee.v4.models.comment.responses.CommentCreateResponse;
+
+public final class CommentService extends BaseService<CommentService> {
+
+  private final ServiceConfig config;
+
+  public CommentService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private CommentService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private CommentService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  CommentService with(RequestOptions newOptions) {
+    return new CommentService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public CommentService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** delete a comment (executes immediately) - returns raw Response. */
+  Response deleteRaw(String commentId) throws ChargebeeException {
+    String path = buildPathWithParams("/comments/{comment-id}/delete", "comment-id", commentId);
+
+    return post(path, null);
+  }
+
+  public CommentDeleteResponse delete(String commentId) throws ChargebeeException {
+    Response response = deleteRaw(commentId);
+    return CommentDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a comment (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String commentId) throws ChargebeeException {
+    String path = buildPathWithParams("/comments/{comment-id}", "comment-id", commentId);
+
+    return get(path, null);
+  }
+
+  public CommentRetrieveResponse retrieve(String commentId) throws ChargebeeException {
+    Response response = retrieveRaw(commentId);
+    return CommentRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** list a comment using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(CommentListParams params) throws ChargebeeException {
+
+    return get("/comments", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a comment without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/comments", null);
+  }
+
+  /** list a comment using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public CommentListResponse list(CommentListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return CommentListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public CommentListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return CommentListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** create a comment using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(CommentCreateParams params) throws ChargebeeException {
+
+    return post("/comments", params != null ? params.toFormData() : null);
+  }
+
+  /** create a comment using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/comments", jsonPayload);
+  }
+
+  public CommentCreateResponse create(CommentCreateParams params) throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return CommentCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/ConfigurationService.java b/src/main/java/com/chargebee/v4/services/ConfigurationService.java
similarity index 81%
rename from src/main/java/com/chargebee/v4/core/services/ConfigurationService.java
rename to src/main/java/com/chargebee/v4/services/ConfigurationService.java
index ac084cad..79d38235 100644
--- a/src/main/java/com/chargebee/v4/core/services/ConfigurationService.java
+++ b/src/main/java/com/chargebee/v4/services/ConfigurationService.java
@@ -5,15 +5,16 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.configuration.params.ConfigurationListParams;
+import com.chargebee.v4.models.configuration.params.ConfigurationListParams;
 
-import com.chargebee.v4.core.responses.configuration.ConfigurationListResponse;
+import com.chargebee.v4.models.configuration.responses.ConfigurationListResponse;
 
 public final class ConfigurationService extends BaseService<ConfigurationService> {
 
@@ -51,18 +52,18 @@ public ConfigurationService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** list a configuration using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(ConfigurationListParams params) throws Exception {
+  Response listRaw(ConfigurationListParams params) throws ChargebeeException {
 
     return get("/configurations", params != null ? params.toQueryParams() : null);
   }
 
   /** list a configuration using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public ConfigurationListResponse list(ConfigurationListParams params) throws Exception {
+  public ConfigurationListResponse list(ConfigurationListParams params) throws ChargebeeException {
     Response response = listRaw(params);
 
     return ConfigurationListResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/services/CouponCodeService.java b/src/main/java/com/chargebee/v4/services/CouponCodeService.java
new file mode 100644
index 00000000..5da0cb04
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/CouponCodeService.java
@@ -0,0 +1,134 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.couponCode.params.CouponCodeListParams;
+
+import com.chargebee.v4.models.couponCode.params.CouponCodeCreateParams;
+
+import com.chargebee.v4.models.couponCode.responses.CouponCodeListResponse;
+
+import com.chargebee.v4.models.couponCode.responses.CouponCodeCreateResponse;
+
+import com.chargebee.v4.models.couponCode.responses.CouponCodeRetrieveResponse;
+
+import com.chargebee.v4.models.couponCode.responses.CouponCodeArchiveResponse;
+
+public final class CouponCodeService extends BaseService<CouponCodeService> {
+
+  private final ServiceConfig config;
+
+  public CouponCodeService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private CouponCodeService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private CouponCodeService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  CouponCodeService with(RequestOptions newOptions) {
+    return new CouponCodeService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public CouponCodeService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** list a couponCode using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(CouponCodeListParams params) throws ChargebeeException {
+
+    return get("/coupon_codes", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a couponCode without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/coupon_codes", null);
+  }
+
+  /** list a couponCode using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public CouponCodeListResponse list(CouponCodeListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return CouponCodeListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public CouponCodeListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return CouponCodeListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** create a couponCode using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(CouponCodeCreateParams params) throws ChargebeeException {
+
+    return post("/coupon_codes", params != null ? params.toFormData() : null);
+  }
+
+  /** create a couponCode using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/coupon_codes", jsonPayload);
+  }
+
+  public CouponCodeCreateResponse create(CouponCodeCreateParams params) throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return CouponCodeCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a couponCode (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String couponCodeCode) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/coupon_codes/{coupon-code-code}", "coupon-code-code", couponCodeCode);
+
+    return get(path, null);
+  }
+
+  public CouponCodeRetrieveResponse retrieve(String couponCodeCode) throws ChargebeeException {
+    Response response = retrieveRaw(couponCodeCode);
+    return CouponCodeRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** archive a couponCode (executes immediately) - returns raw Response. */
+  Response archiveRaw(String couponCodeCode) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/coupon_codes/{coupon-code-code}/archive", "coupon-code-code", couponCodeCode);
+
+    return post(path, null);
+  }
+
+  public CouponCodeArchiveResponse archive(String couponCodeCode) throws ChargebeeException {
+    Response response = archiveRaw(couponCodeCode);
+    return CouponCodeArchiveResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/CouponService.java b/src/main/java/com/chargebee/v4/services/CouponService.java
new file mode 100644
index 00000000..f3765e19
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/CouponService.java
@@ -0,0 +1,260 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.coupon.params.CouponListParams;
+
+import com.chargebee.v4.models.coupon.params.CouponCreateParams;
+
+import com.chargebee.v4.models.coupon.params.CouponUpdateForItemsParams;
+
+import com.chargebee.v4.models.coupon.params.CouponCopyParams;
+
+import com.chargebee.v4.models.coupon.params.CouponUpdateParams;
+
+import com.chargebee.v4.models.coupon.params.CouponCreateForItemsParams;
+
+import com.chargebee.v4.models.coupon.responses.CouponListResponse;
+
+import com.chargebee.v4.models.coupon.responses.CouponCreateResponse;
+
+import com.chargebee.v4.models.coupon.responses.CouponUpdateForItemsResponse;
+
+import com.chargebee.v4.models.coupon.responses.CouponUnarchiveResponse;
+
+import com.chargebee.v4.models.coupon.responses.CouponDeleteResponse;
+
+import com.chargebee.v4.models.coupon.responses.CouponCopyResponse;
+
+import com.chargebee.v4.models.coupon.responses.CouponRetrieveResponse;
+
+import com.chargebee.v4.models.coupon.responses.CouponUpdateResponse;
+
+import com.chargebee.v4.models.coupon.responses.CouponCreateForItemsResponse;
+
+public final class CouponService extends BaseService<CouponService> {
+
+  private final ServiceConfig config;
+
+  public CouponService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private CouponService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private CouponService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  CouponService with(RequestOptions newOptions) {
+    return new CouponService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public CouponService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** list a coupon using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(CouponListParams params) throws ChargebeeException {
+
+    return get("/coupons", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a coupon without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/coupons", null);
+  }
+
+  /** list a coupon using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public CouponListResponse list(CouponListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return CouponListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public CouponListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return CouponListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** create a coupon using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(CouponCreateParams params) throws ChargebeeException {
+
+    return post("/coupons", params != null ? params.toFormData() : null);
+  }
+
+  /** create a coupon using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/coupons", jsonPayload);
+  }
+
+  public CouponCreateResponse create(CouponCreateParams params) throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return CouponCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** updateForItems a coupon (executes immediately) - returns raw Response. */
+  Response updateForItemsRaw(String couponId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/coupons/{coupon-id}/update_for_items", "coupon-id", couponId);
+
+    return post(path, null);
+  }
+
+  /**
+   * updateForItems a coupon using immutable params (executes immediately) - returns raw Response.
+   */
+  Response updateForItemsRaw(String couponId, CouponUpdateForItemsParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/coupons/{coupon-id}/update_for_items", "coupon-id", couponId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * updateForItems a coupon using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response updateForItemsRaw(String couponId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/coupons/{coupon-id}/update_for_items", "coupon-id", couponId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CouponUpdateForItemsResponse updateForItems(
+      String couponId, CouponUpdateForItemsParams params) throws ChargebeeException {
+    Response response = updateForItemsRaw(couponId, params);
+    return CouponUpdateForItemsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** unarchive a coupon (executes immediately) - returns raw Response. */
+  Response unarchiveRaw(String couponId) throws ChargebeeException {
+    String path = buildPathWithParams("/coupons/{coupon-id}/unarchive", "coupon-id", couponId);
+
+    return post(path, null);
+  }
+
+  public CouponUnarchiveResponse unarchive(String couponId) throws ChargebeeException {
+    Response response = unarchiveRaw(couponId);
+    return CouponUnarchiveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** delete a coupon (executes immediately) - returns raw Response. */
+  Response deleteRaw(String couponId) throws ChargebeeException {
+    String path = buildPathWithParams("/coupons/{coupon-id}/delete", "coupon-id", couponId);
+
+    return post(path, null);
+  }
+
+  public CouponDeleteResponse delete(String couponId) throws ChargebeeException {
+    Response response = deleteRaw(couponId);
+    return CouponDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** copy a coupon using immutable params (executes immediately) - returns raw Response. */
+  Response copyRaw(CouponCopyParams params) throws ChargebeeException {
+
+    return post("/coupons/copy", params != null ? params.toFormData() : null);
+  }
+
+  /** copy a coupon using raw JSON payload (executes immediately) - returns raw Response. */
+  Response copyRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/coupons/copy", jsonPayload);
+  }
+
+  public CouponCopyResponse copy(CouponCopyParams params) throws ChargebeeException {
+    Response response = copyRaw(params);
+
+    return CouponCopyResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a coupon (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String couponId) throws ChargebeeException {
+    String path = buildPathWithParams("/coupons/{coupon-id}", "coupon-id", couponId);
+
+    return get(path, null);
+  }
+
+  public CouponRetrieveResponse retrieve(String couponId) throws ChargebeeException {
+    Response response = retrieveRaw(couponId);
+    return CouponRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** update a coupon (executes immediately) - returns raw Response. */
+  Response updateRaw(String couponId) throws ChargebeeException {
+    String path = buildPathWithParams("/coupons/{coupon-id}", "coupon-id", couponId);
+
+    return post(path, null);
+  }
+
+  /** update a coupon using immutable params (executes immediately) - returns raw Response. */
+  Response updateRaw(String couponId, CouponUpdateParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/coupons/{coupon-id}", "coupon-id", couponId);
+    return post(path, params.toFormData());
+  }
+
+  /** update a coupon using raw JSON payload (executes immediately) - returns raw Response. */
+  Response updateRaw(String couponId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/coupons/{coupon-id}", "coupon-id", couponId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CouponUpdateResponse update(String couponId, CouponUpdateParams params)
+      throws ChargebeeException {
+    Response response = updateRaw(couponId, params);
+    return CouponUpdateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createForItems a coupon using immutable params (executes immediately) - returns raw Response.
+   */
+  Response createForItemsRaw(CouponCreateForItemsParams params) throws ChargebeeException {
+
+    return post("/coupons/create_for_items", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createForItems a coupon using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response createForItemsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/coupons/create_for_items", jsonPayload);
+  }
+
+  public CouponCreateForItemsResponse createForItems(CouponCreateForItemsParams params)
+      throws ChargebeeException {
+    Response response = createForItemsRaw(params);
+
+    return CouponCreateForItemsResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/CouponSetService.java b/src/main/java/com/chargebee/v4/services/CouponSetService.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/services/CouponSetService.java
rename to src/main/java/com/chargebee/v4/services/CouponSetService.java
index 3e9b69d4..1fc65517 100644
--- a/src/main/java/com/chargebee/v4/core/services/CouponSetService.java
+++ b/src/main/java/com/chargebee/v4/services/CouponSetService.java
@@ -5,33 +5,34 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.couponSet.params.CouponSetListParams;
+import com.chargebee.v4.models.couponSet.params.CouponSetListParams;
 
-import com.chargebee.v4.core.models.couponSet.params.CouponSetCreateParams;
+import com.chargebee.v4.models.couponSet.params.CouponSetCreateParams;
 
-import com.chargebee.v4.core.models.couponSet.params.CouponSetUpdateParams;
+import com.chargebee.v4.models.couponSet.params.CouponSetUpdateParams;
 
-import com.chargebee.v4.core.models.couponSet.params.CouponSetAddCouponCodesParams;
+import com.chargebee.v4.models.couponSet.params.CouponSetAddCouponCodesParams;
 
-import com.chargebee.v4.core.responses.couponSet.CouponSetListResponse;
+import com.chargebee.v4.models.couponSet.responses.CouponSetListResponse;
 
-import com.chargebee.v4.core.responses.couponSet.CouponSetCreateResponse;
+import com.chargebee.v4.models.couponSet.responses.CouponSetCreateResponse;
 
-import com.chargebee.v4.core.responses.couponSet.CouponSetUpdateResponse;
+import com.chargebee.v4.models.couponSet.responses.CouponSetUpdateResponse;
 
-import com.chargebee.v4.core.responses.couponSet.CouponSetRetrieveResponse;
+import com.chargebee.v4.models.couponSet.responses.CouponSetRetrieveResponse;
 
-import com.chargebee.v4.core.responses.couponSet.CouponSetAddCouponCodesResponse;
+import com.chargebee.v4.models.couponSet.responses.CouponSetAddCouponCodesResponse;
 
-import com.chargebee.v4.core.responses.couponSet.CouponSetDeleteUnusedCouponCodesResponse;
+import com.chargebee.v4.models.couponSet.responses.CouponSetDeleteUnusedCouponCodesResponse;
 
-import com.chargebee.v4.core.responses.couponSet.CouponSetDeleteResponse;
+import com.chargebee.v4.models.couponSet.responses.CouponSetDeleteResponse;
 
 public final class CouponSetService extends BaseService<CouponSetService> {
 
@@ -68,54 +69,54 @@ public CouponSetService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** list a couponSet using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(CouponSetListParams params) throws Exception {
+  Response listRaw(CouponSetListParams params) throws ChargebeeException {
 
     return get("/coupon_sets", params != null ? params.toQueryParams() : null);
   }
 
   /** list a couponSet without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/coupon_sets", null);
   }
 
   /** list a couponSet using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public CouponSetListResponse list(CouponSetListParams params) throws Exception {
+  public CouponSetListResponse list(CouponSetListParams params) throws ChargebeeException {
     Response response = listRaw(params);
 
     return CouponSetListResponse.fromJson(response.getBodyAsString(), this, params, response);
   }
 
-  public CouponSetListResponse list() throws Exception {
+  public CouponSetListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return CouponSetListResponse.fromJson(response.getBodyAsString(), this, null, response);
   }
 
   /** create a couponSet using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(CouponSetCreateParams params) throws Exception {
+  Response createRaw(CouponSetCreateParams params) throws ChargebeeException {
 
     return post("/coupon_sets", params != null ? params.toFormData() : null);
   }
 
   /** create a couponSet using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/coupon_sets", jsonPayload);
   }
 
-  public CouponSetCreateResponse create(CouponSetCreateParams params) throws Exception {
+  public CouponSetCreateResponse create(CouponSetCreateParams params) throws ChargebeeException {
     Response response = createRaw(params);
 
     return CouponSetCreateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a couponSet (executes immediately) - returns raw Response. */
-  Response updateRaw(String couponSetId) throws Exception {
+  Response updateRaw(String couponSetId) throws ChargebeeException {
     String path =
         buildPathWithParams("/coupon_sets/{coupon-set-id}/update", "coupon-set-id", couponSetId);
 
@@ -123,39 +124,39 @@ Response updateRaw(String couponSetId) throws Exception {
   }
 
   /** update a couponSet using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String couponSetId, CouponSetUpdateParams params) throws Exception {
+  Response updateRaw(String couponSetId, CouponSetUpdateParams params) throws ChargebeeException {
     String path =
         buildPathWithParams("/coupon_sets/{coupon-set-id}/update", "coupon-set-id", couponSetId);
     return post(path, params.toFormData());
   }
 
   /** update a couponSet using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String couponSetId, String jsonPayload) throws Exception {
+  Response updateRaw(String couponSetId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/coupon_sets/{coupon-set-id}/update", "coupon-set-id", couponSetId);
     return postJson(path, jsonPayload);
   }
 
   public CouponSetUpdateResponse update(String couponSetId, CouponSetUpdateParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = updateRaw(couponSetId, params);
     return CouponSetUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** retrieve a couponSet (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String couponSetId) throws Exception {
+  Response retrieveRaw(String couponSetId) throws ChargebeeException {
     String path = buildPathWithParams("/coupon_sets/{coupon-set-id}", "coupon-set-id", couponSetId);
 
     return get(path, null);
   }
 
-  public CouponSetRetrieveResponse retrieve(String couponSetId) throws Exception {
+  public CouponSetRetrieveResponse retrieve(String couponSetId) throws ChargebeeException {
     Response response = retrieveRaw(couponSetId);
     return CouponSetRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** addCouponCodes a couponSet (executes immediately) - returns raw Response. */
-  Response addCouponCodesRaw(String couponSetId) throws Exception {
+  Response addCouponCodesRaw(String couponSetId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/coupon_sets/{coupon-set-id}/add_coupon_codes", "coupon-set-id", couponSetId);
@@ -168,7 +169,7 @@ Response addCouponCodesRaw(String couponSetId) throws Exception {
    * Response.
    */
   Response addCouponCodesRaw(String couponSetId, CouponSetAddCouponCodesParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/coupon_sets/{coupon-set-id}/add_coupon_codes", "coupon-set-id", couponSetId);
@@ -179,7 +180,7 @@ Response addCouponCodesRaw(String couponSetId, CouponSetAddCouponCodesParams par
    * addCouponCodes a couponSet using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response addCouponCodesRaw(String couponSetId, String jsonPayload) throws Exception {
+  Response addCouponCodesRaw(String couponSetId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/coupon_sets/{coupon-set-id}/add_coupon_codes", "coupon-set-id", couponSetId);
@@ -187,13 +188,13 @@ Response addCouponCodesRaw(String couponSetId, String jsonPayload) throws Except
   }
 
   public CouponSetAddCouponCodesResponse addCouponCodes(
-      String couponSetId, CouponSetAddCouponCodesParams params) throws Exception {
+      String couponSetId, CouponSetAddCouponCodesParams params) throws ChargebeeException {
     Response response = addCouponCodesRaw(couponSetId, params);
     return CouponSetAddCouponCodesResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** deleteUnusedCouponCodes a couponSet (executes immediately) - returns raw Response. */
-  Response deleteUnusedCouponCodesRaw(String couponSetId) throws Exception {
+  Response deleteUnusedCouponCodesRaw(String couponSetId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/coupon_sets/{coupon-set-id}/delete_unused_coupon_codes",
@@ -204,20 +205,20 @@ Response deleteUnusedCouponCodesRaw(String couponSetId) throws Exception {
   }
 
   public CouponSetDeleteUnusedCouponCodesResponse deleteUnusedCouponCodes(String couponSetId)
-      throws Exception {
+      throws ChargebeeException {
     Response response = deleteUnusedCouponCodesRaw(couponSetId);
     return CouponSetDeleteUnusedCouponCodesResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** delete a couponSet (executes immediately) - returns raw Response. */
-  Response deleteRaw(String couponSetId) throws Exception {
+  Response deleteRaw(String couponSetId) throws ChargebeeException {
     String path =
         buildPathWithParams("/coupon_sets/{coupon-set-id}/delete", "coupon-set-id", couponSetId);
 
     return post(path, null);
   }
 
-  public CouponSetDeleteResponse delete(String couponSetId) throws Exception {
+  public CouponSetDeleteResponse delete(String couponSetId) throws ChargebeeException {
     Response response = deleteRaw(couponSetId);
     return CouponSetDeleteResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/services/CreditNoteService.java b/src/main/java/com/chargebee/v4/services/CreditNoteService.java
new file mode 100644
index 00000000..d05572c0
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/CreditNoteService.java
@@ -0,0 +1,496 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.creditNote.params.CreditNoteRecordRefundParams;
+
+import com.chargebee.v4.models.creditNote.params.ImportCreditNoteParams;
+
+import com.chargebee.v4.models.creditNote.params.CreditNoteDeleteParams;
+
+import com.chargebee.v4.models.creditNote.params.CreditNotesForCustomerParams;
+
+import com.chargebee.v4.models.creditNote.params.CreditNotePdfParams;
+
+import com.chargebee.v4.models.creditNote.params.VoidCreditNoteParams;
+
+import com.chargebee.v4.models.creditNote.params.CreditNoteRefundParams;
+
+import com.chargebee.v4.models.creditNote.params.CreditNoteListParams;
+
+import com.chargebee.v4.models.creditNote.params.CreditNoteCreateParams;
+
+import com.chargebee.v4.models.creditNote.params.CreditNoteRemoveTaxWithheldRefundParams;
+
+import com.chargebee.v4.models.creditNote.params.CreditNoteRetrieveParams;
+
+import com.chargebee.v4.models.creditNote.responses.CreditNoteRecordRefundResponse;
+
+import com.chargebee.v4.models.creditNote.responses.ImportCreditNoteResponse;
+
+import com.chargebee.v4.models.creditNote.responses.CreditNoteDeleteResponse;
+
+import com.chargebee.v4.models.creditNote.responses.CreditNotesForCustomerResponse;
+
+import com.chargebee.v4.models.creditNote.responses.CreditNotePdfResponse;
+
+import com.chargebee.v4.models.creditNote.responses.CreditNoteSendEinvoiceResponse;
+
+import com.chargebee.v4.models.creditNote.responses.VoidCreditNoteResponse;
+
+import com.chargebee.v4.models.creditNote.responses.CreditNoteRefundResponse;
+
+import com.chargebee.v4.models.creditNote.responses.CreditNoteListResponse;
+
+import com.chargebee.v4.models.creditNote.responses.CreditNoteCreateResponse;
+
+import com.chargebee.v4.models.creditNote.responses.CreditNoteDownloadEinvoiceResponse;
+
+import com.chargebee.v4.models.creditNote.responses.CreditNoteResendEinvoiceResponse;
+
+import com.chargebee.v4.models.creditNote.responses.CreditNoteRemoveTaxWithheldRefundResponse;
+
+import com.chargebee.v4.models.creditNote.responses.CreditNoteRetrieveResponse;
+
+public final class CreditNoteService extends BaseService<CreditNoteService> {
+
+  private final ServiceConfig config;
+
+  public CreditNoteService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private CreditNoteService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private CreditNoteService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  CreditNoteService with(RequestOptions newOptions) {
+    return new CreditNoteService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public CreditNoteService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** recordRefund a creditNote (executes immediately) - returns raw Response. */
+  Response recordRefundRaw(String creditNoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/record_refund", "credit-note-id", creditNoteId);
+
+    return post(path, null);
+  }
+
+  /**
+   * recordRefund a creditNote using immutable params (executes immediately) - returns raw Response.
+   */
+  Response recordRefundRaw(String creditNoteId, CreditNoteRecordRefundParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/record_refund", "credit-note-id", creditNoteId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * recordRefund a creditNote using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response recordRefundRaw(String creditNoteId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/record_refund", "credit-note-id", creditNoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CreditNoteRecordRefundResponse recordRefund(
+      String creditNoteId, CreditNoteRecordRefundParams params) throws ChargebeeException {
+    Response response = recordRefundRaw(creditNoteId, params);
+    return CreditNoteRecordRefundResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * importCreditNote a creditNote using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response importCreditNoteRaw(ImportCreditNoteParams params) throws ChargebeeException {
+
+    return post("/credit_notes/import_credit_note", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * importCreditNote a creditNote using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response importCreditNoteRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/credit_notes/import_credit_note", jsonPayload);
+  }
+
+  public ImportCreditNoteResponse importCreditNote(ImportCreditNoteParams params)
+      throws ChargebeeException {
+    Response response = importCreditNoteRaw(params);
+
+    return ImportCreditNoteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** delete a creditNote (executes immediately) - returns raw Response. */
+  Response deleteRaw(String creditNoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/delete", "credit-note-id", creditNoteId);
+
+    return post(path, null);
+  }
+
+  /** delete a creditNote using immutable params (executes immediately) - returns raw Response. */
+  Response deleteRaw(String creditNoteId, CreditNoteDeleteParams params) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/delete", "credit-note-id", creditNoteId);
+    return post(path, params.toFormData());
+  }
+
+  /** delete a creditNote using raw JSON payload (executes immediately) - returns raw Response. */
+  Response deleteRaw(String creditNoteId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/delete", "credit-note-id", creditNoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CreditNoteDeleteResponse delete(String creditNoteId, CreditNoteDeleteParams params)
+      throws ChargebeeException {
+    Response response = deleteRaw(creditNoteId, params);
+    return CreditNoteDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * creditNotesForCustomer a creditNote using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response creditNotesForCustomerRaw(String customerId, CreditNotesForCustomerParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/credit_notes", "customer-id", customerId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * creditNotesForCustomer a creditNote without params (executes immediately) - returns raw
+   * Response.
+   */
+  Response creditNotesForCustomerRaw(String customerId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/credit_notes", "customer-id", customerId);
+    return get(path, null);
+  }
+
+  /**
+   * creditNotesForCustomer a creditNote using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response creditNotesForCustomerRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/credit_notes", "customer-id", customerId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public CreditNotesForCustomerResponse creditNotesForCustomer(
+      String customerId, CreditNotesForCustomerParams params) throws ChargebeeException {
+    Response response = creditNotesForCustomerRaw(customerId, params);
+    return CreditNotesForCustomerResponse.fromJson(
+        response.getBodyAsString(), this, params, customerId, response);
+  }
+
+  public CreditNotesForCustomerResponse creditNotesForCustomer(String customerId)
+      throws ChargebeeException {
+    Response response = creditNotesForCustomerRaw(customerId);
+    return CreditNotesForCustomerResponse.fromJson(
+        response.getBodyAsString(), this, null, customerId, response);
+  }
+
+  /** pdf a creditNote (executes immediately) - returns raw Response. */
+  Response pdfRaw(String creditNoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/credit_notes/{credit-note-id}/pdf", "credit-note-id", creditNoteId);
+
+    return post(path, null);
+  }
+
+  /** pdf a creditNote using immutable params (executes immediately) - returns raw Response. */
+  Response pdfRaw(String creditNoteId, CreditNotePdfParams params) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/credit_notes/{credit-note-id}/pdf", "credit-note-id", creditNoteId);
+    return post(path, params.toFormData());
+  }
+
+  /** pdf a creditNote using raw JSON payload (executes immediately) - returns raw Response. */
+  Response pdfRaw(String creditNoteId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/credit_notes/{credit-note-id}/pdf", "credit-note-id", creditNoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CreditNotePdfResponse pdf(String creditNoteId, CreditNotePdfParams params)
+      throws ChargebeeException {
+    Response response = pdfRaw(creditNoteId, params);
+    return CreditNotePdfResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** sendEinvoice a creditNote (executes immediately) - returns raw Response. */
+  Response sendEinvoiceRaw(String creditNoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/send_einvoice", "credit-note-id", creditNoteId);
+
+    return post(path, null);
+  }
+
+  public CreditNoteSendEinvoiceResponse sendEinvoice(String creditNoteId)
+      throws ChargebeeException {
+    Response response = sendEinvoiceRaw(creditNoteId);
+    return CreditNoteSendEinvoiceResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** voidCreditNote a creditNote (executes immediately) - returns raw Response. */
+  Response voidCreditNoteRaw(String creditNoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/credit_notes/{credit-note-id}/void", "credit-note-id", creditNoteId);
+
+    return post(path, null);
+  }
+
+  /**
+   * voidCreditNote a creditNote using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response voidCreditNoteRaw(String creditNoteId, VoidCreditNoteParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/credit_notes/{credit-note-id}/void", "credit-note-id", creditNoteId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * voidCreditNote a creditNote using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response voidCreditNoteRaw(String creditNoteId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/credit_notes/{credit-note-id}/void", "credit-note-id", creditNoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public VoidCreditNoteResponse voidCreditNote(String creditNoteId, VoidCreditNoteParams params)
+      throws ChargebeeException {
+    Response response = voidCreditNoteRaw(creditNoteId, params);
+    return VoidCreditNoteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** refund a creditNote (executes immediately) - returns raw Response. */
+  Response refundRaw(String creditNoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/refund", "credit-note-id", creditNoteId);
+
+    return post(path, null);
+  }
+
+  /** refund a creditNote using immutable params (executes immediately) - returns raw Response. */
+  Response refundRaw(String creditNoteId, CreditNoteRefundParams params) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/refund", "credit-note-id", creditNoteId);
+    return post(path, params.toFormData());
+  }
+
+  /** refund a creditNote using raw JSON payload (executes immediately) - returns raw Response. */
+  Response refundRaw(String creditNoteId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/refund", "credit-note-id", creditNoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CreditNoteRefundResponse refund(String creditNoteId, CreditNoteRefundParams params)
+      throws ChargebeeException {
+    Response response = refundRaw(creditNoteId, params);
+    return CreditNoteRefundResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** list a creditNote using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(CreditNoteListParams params) throws ChargebeeException {
+
+    return get("/credit_notes", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a creditNote without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/credit_notes", null);
+  }
+
+  /** list a creditNote using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public CreditNoteListResponse list(CreditNoteListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return CreditNoteListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public CreditNoteListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return CreditNoteListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** create a creditNote using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(CreditNoteCreateParams params) throws ChargebeeException {
+
+    return post("/credit_notes", params != null ? params.toFormData() : null);
+  }
+
+  /** create a creditNote using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/credit_notes", jsonPayload);
+  }
+
+  public CreditNoteCreateResponse create(CreditNoteCreateParams params) throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return CreditNoteCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** downloadEinvoice a creditNote (executes immediately) - returns raw Response. */
+  Response downloadEinvoiceRaw(String creditNoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/download_einvoice", "credit-note-id", creditNoteId);
+
+    return get(path, null);
+  }
+
+  public CreditNoteDownloadEinvoiceResponse downloadEinvoice(String creditNoteId)
+      throws ChargebeeException {
+    Response response = downloadEinvoiceRaw(creditNoteId);
+    return CreditNoteDownloadEinvoiceResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** resendEinvoice a creditNote (executes immediately) - returns raw Response. */
+  Response resendEinvoiceRaw(String creditNoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/resend_einvoice", "credit-note-id", creditNoteId);
+
+    return post(path, null);
+  }
+
+  public CreditNoteResendEinvoiceResponse resendEinvoice(String creditNoteId)
+      throws ChargebeeException {
+    Response response = resendEinvoiceRaw(creditNoteId);
+    return CreditNoteResendEinvoiceResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** removeTaxWithheldRefund a creditNote (executes immediately) - returns raw Response. */
+  Response removeTaxWithheldRefundRaw(String creditNoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/remove_tax_withheld_refund",
+            "credit-note-id",
+            creditNoteId);
+
+    return post(path, null);
+  }
+
+  /**
+   * removeTaxWithheldRefund a creditNote using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response removeTaxWithheldRefundRaw(
+      String creditNoteId, CreditNoteRemoveTaxWithheldRefundParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/remove_tax_withheld_refund",
+            "credit-note-id",
+            creditNoteId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * removeTaxWithheldRefund a creditNote using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response removeTaxWithheldRefundRaw(String creditNoteId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/credit_notes/{credit-note-id}/remove_tax_withheld_refund",
+            "credit-note-id",
+            creditNoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CreditNoteRemoveTaxWithheldRefundResponse removeTaxWithheldRefund(
+      String creditNoteId, CreditNoteRemoveTaxWithheldRefundParams params)
+      throws ChargebeeException {
+    Response response = removeTaxWithheldRefundRaw(creditNoteId, params);
+    return CreditNoteRemoveTaxWithheldRefundResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a creditNote (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String creditNoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/credit_notes/{credit-note-id}", "credit-note-id", creditNoteId);
+
+    return get(path, null);
+  }
+
+  /** retrieve a creditNote using immutable params (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String creditNoteId, CreditNoteRetrieveParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/credit_notes/{credit-note-id}", "credit-note-id", creditNoteId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  public CreditNoteRetrieveResponse retrieve(String creditNoteId, CreditNoteRetrieveParams params)
+      throws ChargebeeException {
+    Response response = retrieveRaw(creditNoteId, params);
+    return CreditNoteRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  public CreditNoteRetrieveResponse retrieve(String creditNoteId) throws ChargebeeException {
+    Response response = retrieveRaw(creditNoteId);
+    return CreditNoteRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/CsvTaxRuleService.java b/src/main/java/com/chargebee/v4/services/CsvTaxRuleService.java
similarity index 81%
rename from src/main/java/com/chargebee/v4/core/services/CsvTaxRuleService.java
rename to src/main/java/com/chargebee/v4/services/CsvTaxRuleService.java
index befb762e..0dd52a44 100644
--- a/src/main/java/com/chargebee/v4/core/services/CsvTaxRuleService.java
+++ b/src/main/java/com/chargebee/v4/services/CsvTaxRuleService.java
@@ -5,15 +5,16 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.csvTaxRule.params.CsvTaxRuleCreateParams;
+import com.chargebee.v4.models.csvTaxRule.params.CsvTaxRuleCreateParams;
 
-import com.chargebee.v4.core.responses.csvTaxRule.CsvTaxRuleCreateResponse;
+import com.chargebee.v4.models.csvTaxRule.responses.CsvTaxRuleCreateResponse;
 
 public final class CsvTaxRuleService extends BaseService<CsvTaxRuleService> {
 
@@ -50,18 +51,18 @@ public CsvTaxRuleService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** create a csvTaxRule using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(CsvTaxRuleCreateParams params) throws Exception {
+  Response createRaw(CsvTaxRuleCreateParams params) throws ChargebeeException {
 
     return post("/csv_tax_rules", params != null ? params.toFormData() : null);
   }
 
   /** create a csvTaxRule using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/csv_tax_rules", jsonPayload);
   }
 
-  public CsvTaxRuleCreateResponse create(CsvTaxRuleCreateParams params) throws Exception {
+  public CsvTaxRuleCreateResponse create(CsvTaxRuleCreateParams params) throws ChargebeeException {
     Response response = createRaw(params);
 
     return CsvTaxRuleCreateResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/core/services/CurrencyService.java b/src/main/java/com/chargebee/v4/services/CurrencyService.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/services/CurrencyService.java
rename to src/main/java/com/chargebee/v4/services/CurrencyService.java
index 350b2e7d..f6f010d3 100644
--- a/src/main/java/com/chargebee/v4/core/services/CurrencyService.java
+++ b/src/main/java/com/chargebee/v4/services/CurrencyService.java
@@ -5,31 +5,32 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.currency.params.CurrencyAddScheduleParams;
+import com.chargebee.v4.models.currency.params.CurrencyAddScheduleParams;
 
-import com.chargebee.v4.core.models.currency.params.CurrencyCreateParams;
+import com.chargebee.v4.models.currency.params.CurrencyCreateParams;
 
-import com.chargebee.v4.core.models.currency.params.CurrencyUpdateParams;
+import com.chargebee.v4.models.currency.params.CurrencyUpdateParams;
 
-import com.chargebee.v4.core.models.currency.params.CurrencyListParams;
+import com.chargebee.v4.models.currency.params.CurrencyListParams;
 
-import com.chargebee.v4.core.responses.currency.CurrencyAddScheduleResponse;
+import com.chargebee.v4.models.currency.responses.CurrencyAddScheduleResponse;
 
-import com.chargebee.v4.core.responses.currency.CurrencyCreateResponse;
+import com.chargebee.v4.models.currency.responses.CurrencyCreateResponse;
 
-import com.chargebee.v4.core.responses.currency.CurrencyRetrieveResponse;
+import com.chargebee.v4.models.currency.responses.CurrencyRetrieveResponse;
 
-import com.chargebee.v4.core.responses.currency.CurrencyUpdateResponse;
+import com.chargebee.v4.models.currency.responses.CurrencyUpdateResponse;
 
-import com.chargebee.v4.core.responses.currency.CurrencyRemoveScheduleResponse;
+import com.chargebee.v4.models.currency.responses.CurrencyRemoveScheduleResponse;
 
-import com.chargebee.v4.core.responses.currency.CurrencyListResponse;
+import com.chargebee.v4.models.currency.responses.CurrencyListResponse;
 
 public final class CurrencyService extends BaseService<CurrencyService> {
 
@@ -66,7 +67,7 @@ public CurrencyService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** addSchedule a currency (executes immediately) - returns raw Response. */
-  Response addScheduleRaw(String siteCurrencyId) throws Exception {
+  Response addScheduleRaw(String siteCurrencyId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/currencies/{site-currency-id}/add_schedule", "site-currency-id", siteCurrencyId);
@@ -78,7 +79,7 @@ Response addScheduleRaw(String siteCurrencyId) throws Exception {
    * addSchedule a currency using immutable params (executes immediately) - returns raw Response.
    */
   Response addScheduleRaw(String siteCurrencyId, CurrencyAddScheduleParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/currencies/{site-currency-id}/add_schedule", "site-currency-id", siteCurrencyId);
@@ -88,7 +89,7 @@ Response addScheduleRaw(String siteCurrencyId, CurrencyAddScheduleParams params)
   /**
    * addSchedule a currency using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response addScheduleRaw(String siteCurrencyId, String jsonPayload) throws Exception {
+  Response addScheduleRaw(String siteCurrencyId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/currencies/{site-currency-id}/add_schedule", "site-currency-id", siteCurrencyId);
@@ -96,44 +97,44 @@ Response addScheduleRaw(String siteCurrencyId, String jsonPayload) throws Except
   }
 
   public CurrencyAddScheduleResponse addSchedule(
-      String siteCurrencyId, CurrencyAddScheduleParams params) throws Exception {
+      String siteCurrencyId, CurrencyAddScheduleParams params) throws ChargebeeException {
     Response response = addScheduleRaw(siteCurrencyId, params);
     return CurrencyAddScheduleResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** create a currency using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(CurrencyCreateParams params) throws Exception {
+  Response createRaw(CurrencyCreateParams params) throws ChargebeeException {
 
     return post("/currencies", params != null ? params.toFormData() : null);
   }
 
   /** create a currency using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/currencies", jsonPayload);
   }
 
-  public CurrencyCreateResponse create(CurrencyCreateParams params) throws Exception {
+  public CurrencyCreateResponse create(CurrencyCreateParams params) throws ChargebeeException {
     Response response = createRaw(params);
 
     return CurrencyCreateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** retrieve a currency (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String siteCurrencyId) throws Exception {
+  Response retrieveRaw(String siteCurrencyId) throws ChargebeeException {
     String path =
         buildPathWithParams("/currencies/{site-currency-id}", "site-currency-id", siteCurrencyId);
 
     return get(path, null);
   }
 
-  public CurrencyRetrieveResponse retrieve(String siteCurrencyId) throws Exception {
+  public CurrencyRetrieveResponse retrieve(String siteCurrencyId) throws ChargebeeException {
     Response response = retrieveRaw(siteCurrencyId);
     return CurrencyRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a currency (executes immediately) - returns raw Response. */
-  Response updateRaw(String siteCurrencyId) throws Exception {
+  Response updateRaw(String siteCurrencyId) throws ChargebeeException {
     String path =
         buildPathWithParams("/currencies/{site-currency-id}", "site-currency-id", siteCurrencyId);
 
@@ -141,27 +142,27 @@ Response updateRaw(String siteCurrencyId) throws Exception {
   }
 
   /** update a currency using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String siteCurrencyId, CurrencyUpdateParams params) throws Exception {
+  Response updateRaw(String siteCurrencyId, CurrencyUpdateParams params) throws ChargebeeException {
     String path =
         buildPathWithParams("/currencies/{site-currency-id}", "site-currency-id", siteCurrencyId);
     return post(path, params.toFormData());
   }
 
   /** update a currency using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String siteCurrencyId, String jsonPayload) throws Exception {
+  Response updateRaw(String siteCurrencyId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/currencies/{site-currency-id}", "site-currency-id", siteCurrencyId);
     return postJson(path, jsonPayload);
   }
 
   public CurrencyUpdateResponse update(String siteCurrencyId, CurrencyUpdateParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = updateRaw(siteCurrencyId, params);
     return CurrencyUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** removeSchedule a currency (executes immediately) - returns raw Response. */
-  Response removeScheduleRaw(String siteCurrencyId) throws Exception {
+  Response removeScheduleRaw(String siteCurrencyId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/currencies/{site-currency-id}/remove_schedule", "site-currency-id", siteCurrencyId);
@@ -169,36 +170,37 @@ Response removeScheduleRaw(String siteCurrencyId) throws Exception {
     return post(path, null);
   }
 
-  public CurrencyRemoveScheduleResponse removeSchedule(String siteCurrencyId) throws Exception {
+  public CurrencyRemoveScheduleResponse removeSchedule(String siteCurrencyId)
+      throws ChargebeeException {
     Response response = removeScheduleRaw(siteCurrencyId);
     return CurrencyRemoveScheduleResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** list a currency using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(CurrencyListParams params) throws Exception {
+  Response listRaw(CurrencyListParams params) throws ChargebeeException {
 
     return get("/currencies/list", params != null ? params.toQueryParams() : null);
   }
 
   /** list a currency without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/currencies/list", null);
   }
 
   /** list a currency using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public CurrencyListResponse list(CurrencyListParams params) throws Exception {
+  public CurrencyListResponse list(CurrencyListParams params) throws ChargebeeException {
     Response response = listRaw(params);
 
     return CurrencyListResponse.fromJson(response.getBodyAsString(), this, params, response);
   }
 
-  public CurrencyListResponse list() throws Exception {
+  public CurrencyListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return CurrencyListResponse.fromJson(response.getBodyAsString(), this, null, response);
   }
diff --git a/src/main/java/com/chargebee/v4/core/services/CustomerEntitlementService.java b/src/main/java/com/chargebee/v4/services/CustomerEntitlementService.java
similarity index 86%
rename from src/main/java/com/chargebee/v4/core/services/CustomerEntitlementService.java
rename to src/main/java/com/chargebee/v4/services/CustomerEntitlementService.java
index 04d4c7f2..22fcbe72 100644
--- a/src/main/java/com/chargebee/v4/core/services/CustomerEntitlementService.java
+++ b/src/main/java/com/chargebee/v4/services/CustomerEntitlementService.java
@@ -5,15 +5,16 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.customerEntitlement.params.CustomerEntitlementEntitlementsForCustomerParams;
+import com.chargebee.v4.models.customerEntitlement.params.CustomerEntitlementEntitlementsForCustomerParams;
 
-import com.chargebee.v4.core.responses.customerEntitlement.CustomerEntitlementEntitlementsForCustomerResponse;
+import com.chargebee.v4.models.customerEntitlement.responses.CustomerEntitlementEntitlementsForCustomerResponse;
 
 public final class CustomerEntitlementService extends BaseService<CustomerEntitlementService> {
 
@@ -55,7 +56,8 @@ public CustomerEntitlementService withOptions(RequestOptions options) {
    * returns raw Response.
    */
   Response entitlementsForCustomerRaw(
-      String customerId, CustomerEntitlementEntitlementsForCustomerParams params) throws Exception {
+      String customerId, CustomerEntitlementEntitlementsForCustomerParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/customer_entitlements", "customer-id", customerId);
@@ -66,7 +68,7 @@ Response entitlementsForCustomerRaw(
    * entitlementsForCustomer a customerEntitlement without params (executes immediately) - returns
    * raw Response.
    */
-  Response entitlementsForCustomerRaw(String customerId) throws Exception {
+  Response entitlementsForCustomerRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/customer_entitlements", "customer-id", customerId);
@@ -77,7 +79,8 @@ Response entitlementsForCustomerRaw(String customerId) throws Exception {
    * entitlementsForCustomer a customerEntitlement using raw JSON payload (executes immediately) -
    * returns raw Response.
    */
-  Response entitlementsForCustomerRaw(String customerId, String jsonPayload) throws Exception {
+  Response entitlementsForCustomerRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/customer_entitlements", "customer-id", customerId);
@@ -85,14 +88,15 @@ Response entitlementsForCustomerRaw(String customerId, String jsonPayload) throw
   }
 
   public CustomerEntitlementEntitlementsForCustomerResponse entitlementsForCustomer(
-      String customerId, CustomerEntitlementEntitlementsForCustomerParams params) throws Exception {
+      String customerId, CustomerEntitlementEntitlementsForCustomerParams params)
+      throws ChargebeeException {
     Response response = entitlementsForCustomerRaw(customerId, params);
     return CustomerEntitlementEntitlementsForCustomerResponse.fromJson(
         response.getBodyAsString(), this, params, customerId, response);
   }
 
   public CustomerEntitlementEntitlementsForCustomerResponse entitlementsForCustomer(
-      String customerId) throws Exception {
+      String customerId) throws ChargebeeException {
     Response response = entitlementsForCustomerRaw(customerId);
     return CustomerEntitlementEntitlementsForCustomerResponse.fromJson(
         response.getBodyAsString(), this, null, customerId, response);
diff --git a/src/main/java/com/chargebee/v4/core/services/CustomerService.java b/src/main/java/com/chargebee/v4/services/CustomerService.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/services/CustomerService.java
rename to src/main/java/com/chargebee/v4/services/CustomerService.java
index ade373b6..11787ba2 100644
--- a/src/main/java/com/chargebee/v4/core/services/CustomerService.java
+++ b/src/main/java/com/chargebee/v4/services/CustomerService.java
@@ -5,107 +5,110 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.customer.params.CustomerDeleteParams;
+import com.chargebee.v4.models.customer.params.CustomerDeleteParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerAddPromotionalCreditsParams;
+import com.chargebee.v4.models.customer.params.CustomerAddPromotionalCreditsParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerRelationshipsParams;
+import com.chargebee.v4.models.customer.params.CustomerRelationshipsParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerDeleteContactParams;
+import com.chargebee.v4.models.customer.params.CustomerDeleteContactParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerAssignPaymentRoleParams;
+import com.chargebee.v4.models.customer.params.CustomerAssignPaymentRoleParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerMoveParams;
+import com.chargebee.v4.models.customer.params.CustomerMoveParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerUpdatePaymentMethodParams;
+import com.chargebee.v4.models.customer.params.CustomerHierarchyParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerUpdateParams;
+import com.chargebee.v4.models.customer.params.CustomerUpdatePaymentMethodParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerListHierarchyDetailParams;
+import com.chargebee.v4.models.customer.params.CustomerUpdateParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerChangeBillingDateParams;
+import com.chargebee.v4.models.customer.params.CustomerListHierarchyDetailParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerListParams;
+import com.chargebee.v4.models.customer.params.CustomerChangeBillingDateParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerCreateParams;
+import com.chargebee.v4.models.customer.params.CustomerListParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerAddContactParams;
+import com.chargebee.v4.models.customer.params.CustomerCreateParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerContactsForCustomerParams;
+import com.chargebee.v4.models.customer.params.CustomerAddContactParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerDeductPromotionalCreditsParams;
+import com.chargebee.v4.models.customer.params.ContactsForCustomerParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerMergeParams;
+import com.chargebee.v4.models.customer.params.CustomerDeductPromotionalCreditsParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerCollectPaymentParams;
+import com.chargebee.v4.models.customer.params.CustomerMergeParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerRecordExcessPaymentParams;
+import com.chargebee.v4.models.customer.params.CustomerCollectPaymentParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerSetPromotionalCreditsParams;
+import com.chargebee.v4.models.customer.params.CustomerRecordExcessPaymentParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerUpdateContactParams;
+import com.chargebee.v4.models.customer.params.CustomerSetPromotionalCreditsParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerUpdateHierarchySettingsParams;
+import com.chargebee.v4.models.customer.params.CustomerUpdateContactParams;
 
-import com.chargebee.v4.core.models.customer.params.CustomerUpdateBillingInfoParams;
+import com.chargebee.v4.models.customer.params.CustomerUpdateHierarchySettingsParams;
 
-import com.chargebee.v4.core.responses.customer.CustomerDeleteResponse;
+import com.chargebee.v4.models.customer.params.CustomerUpdateBillingInfoParams;
 
-import com.chargebee.v4.core.responses.customer.CustomerAddPromotionalCreditsResponse;
+import com.chargebee.v4.models.customer.responses.CustomerDeleteResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerRelationshipsResponse;
+import com.chargebee.v4.models.customer.responses.CustomerAddPromotionalCreditsResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerDeleteRelationshipResponse;
+import com.chargebee.v4.models.customer.responses.CustomerRelationshipsResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerDeleteContactResponse;
+import com.chargebee.v4.models.customer.responses.CustomerDeleteRelationshipResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerAssignPaymentRoleResponse;
+import com.chargebee.v4.models.customer.responses.CustomerDeleteContactResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerMoveResponse;
+import com.chargebee.v4.models.customer.responses.CustomerAssignPaymentRoleResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerHierarchyResponse;
+import com.chargebee.v4.models.customer.responses.CustomerMoveResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerUpdatePaymentMethodResponse;
+import com.chargebee.v4.models.customer.responses.CustomerHierarchyResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerRetrieveResponse;
+import com.chargebee.v4.models.customer.responses.CustomerUpdatePaymentMethodResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerUpdateResponse;
+import com.chargebee.v4.models.customer.responses.CustomerRetrieveResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerListHierarchyDetailResponse;
+import com.chargebee.v4.models.customer.responses.CustomerUpdateResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerChangeBillingDateResponse;
+import com.chargebee.v4.models.customer.responses.CustomerListHierarchyDetailResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerListResponse;
+import com.chargebee.v4.models.customer.responses.CustomerChangeBillingDateResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerCreateResponse;
+import com.chargebee.v4.models.customer.responses.CustomerListResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerAddContactResponse;
+import com.chargebee.v4.models.customer.responses.CustomerCreateResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerContactsForCustomerResponse;
+import com.chargebee.v4.models.customer.responses.CustomerAddContactResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerDeductPromotionalCreditsResponse;
+import com.chargebee.v4.models.customer.responses.ContactsForCustomerResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerClearPersonalDataResponse;
+import com.chargebee.v4.models.customer.responses.CustomerDeductPromotionalCreditsResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerMergeResponse;
+import com.chargebee.v4.models.customer.responses.CustomerClearPersonalDataResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerCollectPaymentResponse;
+import com.chargebee.v4.models.customer.responses.CustomerMergeResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerRecordExcessPaymentResponse;
+import com.chargebee.v4.models.customer.responses.CustomerCollectPaymentResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerSetPromotionalCreditsResponse;
+import com.chargebee.v4.models.customer.responses.CustomerRecordExcessPaymentResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerUpdateContactResponse;
+import com.chargebee.v4.models.customer.responses.CustomerSetPromotionalCreditsResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerUpdateHierarchySettingsResponse;
+import com.chargebee.v4.models.customer.responses.CustomerUpdateContactResponse;
 
-import com.chargebee.v4.core.responses.customer.CustomerUpdateBillingInfoResponse;
+import com.chargebee.v4.models.customer.responses.CustomerUpdateHierarchySettingsResponse;
+
+import com.chargebee.v4.models.customer.responses.CustomerUpdateBillingInfoResponse;
 
 public final class CustomerService extends BaseService<CustomerService> {
 
@@ -142,32 +145,32 @@ public CustomerService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** delete a customer (executes immediately) - returns raw Response. */
-  Response deleteRaw(String customerId) throws Exception {
+  Response deleteRaw(String customerId) throws ChargebeeException {
     String path = buildPathWithParams("/customers/{customer-id}/delete", "customer-id", customerId);
 
     return post(path, null);
   }
 
   /** delete a customer using immutable params (executes immediately) - returns raw Response. */
-  Response deleteRaw(String customerId, CustomerDeleteParams params) throws Exception {
+  Response deleteRaw(String customerId, CustomerDeleteParams params) throws ChargebeeException {
     String path = buildPathWithParams("/customers/{customer-id}/delete", "customer-id", customerId);
     return post(path, params.toFormData());
   }
 
   /** delete a customer using raw JSON payload (executes immediately) - returns raw Response. */
-  Response deleteRaw(String customerId, String jsonPayload) throws Exception {
+  Response deleteRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path = buildPathWithParams("/customers/{customer-id}/delete", "customer-id", customerId);
     return postJson(path, jsonPayload);
   }
 
   public CustomerDeleteResponse delete(String customerId, CustomerDeleteParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = deleteRaw(customerId, params);
     return CustomerDeleteResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** addPromotionalCredits a customer (executes immediately) - returns raw Response. */
-  Response addPromotionalCreditsRaw(String customerId) throws Exception {
+  Response addPromotionalCreditsRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/add_promotional_credits", "customer-id", customerId);
@@ -180,7 +183,7 @@ Response addPromotionalCreditsRaw(String customerId) throws Exception {
    * Response.
    */
   Response addPromotionalCreditsRaw(String customerId, CustomerAddPromotionalCreditsParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/add_promotional_credits", "customer-id", customerId);
@@ -191,7 +194,8 @@ Response addPromotionalCreditsRaw(String customerId, CustomerAddPromotionalCredi
    * addPromotionalCredits a customer using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response addPromotionalCreditsRaw(String customerId, String jsonPayload) throws Exception {
+  Response addPromotionalCreditsRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/add_promotional_credits", "customer-id", customerId);
@@ -199,13 +203,13 @@ Response addPromotionalCreditsRaw(String customerId, String jsonPayload) throws
   }
 
   public CustomerAddPromotionalCreditsResponse addPromotionalCredits(
-      String customerId, CustomerAddPromotionalCreditsParams params) throws Exception {
+      String customerId, CustomerAddPromotionalCreditsParams params) throws ChargebeeException {
     Response response = addPromotionalCreditsRaw(customerId, params);
     return CustomerAddPromotionalCreditsResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** relationships a customer (executes immediately) - returns raw Response. */
-  Response relationshipsRaw(String customerId) throws Exception {
+  Response relationshipsRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/relationships", "customer-id", customerId);
 
@@ -216,7 +220,7 @@ Response relationshipsRaw(String customerId) throws Exception {
    * relationships a customer using immutable params (executes immediately) - returns raw Response.
    */
   Response relationshipsRaw(String customerId, CustomerRelationshipsParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/relationships", "customer-id", customerId);
     return post(path, params.toFormData());
@@ -225,20 +229,20 @@ Response relationshipsRaw(String customerId, CustomerRelationshipsParams params)
   /**
    * relationships a customer using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response relationshipsRaw(String customerId, String jsonPayload) throws Exception {
+  Response relationshipsRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/relationships", "customer-id", customerId);
     return postJson(path, jsonPayload);
   }
 
   public CustomerRelationshipsResponse relationships(
-      String customerId, CustomerRelationshipsParams params) throws Exception {
+      String customerId, CustomerRelationshipsParams params) throws ChargebeeException {
     Response response = relationshipsRaw(customerId, params);
     return CustomerRelationshipsResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** deleteRelationship a customer (executes immediately) - returns raw Response. */
-  Response deleteRelationshipRaw(String customerId) throws Exception {
+  Response deleteRelationshipRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/delete_relationship", "customer-id", customerId);
@@ -246,13 +250,14 @@ Response deleteRelationshipRaw(String customerId) throws Exception {
     return post(path, null);
   }
 
-  public CustomerDeleteRelationshipResponse deleteRelationship(String customerId) throws Exception {
+  public CustomerDeleteRelationshipResponse deleteRelationship(String customerId)
+      throws ChargebeeException {
     Response response = deleteRelationshipRaw(customerId);
     return CustomerDeleteRelationshipResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** deleteContact a customer (executes immediately) - returns raw Response. */
-  Response deleteContactRaw(String customerId) throws Exception {
+  Response deleteContactRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/delete_contact", "customer-id", customerId);
 
@@ -263,7 +268,7 @@ Response deleteContactRaw(String customerId) throws Exception {
    * deleteContact a customer using immutable params (executes immediately) - returns raw Response.
    */
   Response deleteContactRaw(String customerId, CustomerDeleteContactParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/delete_contact", "customer-id", customerId);
     return post(path, params.toFormData());
@@ -272,20 +277,20 @@ Response deleteContactRaw(String customerId, CustomerDeleteContactParams params)
   /**
    * deleteContact a customer using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response deleteContactRaw(String customerId, String jsonPayload) throws Exception {
+  Response deleteContactRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/delete_contact", "customer-id", customerId);
     return postJson(path, jsonPayload);
   }
 
   public CustomerDeleteContactResponse deleteContact(
-      String customerId, CustomerDeleteContactParams params) throws Exception {
+      String customerId, CustomerDeleteContactParams params) throws ChargebeeException {
     Response response = deleteContactRaw(customerId, params);
     return CustomerDeleteContactResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** assignPaymentRole a customer (executes immediately) - returns raw Response. */
-  Response assignPaymentRoleRaw(String customerId) throws Exception {
+  Response assignPaymentRoleRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/assign_payment_role", "customer-id", customerId);
@@ -298,7 +303,7 @@ Response assignPaymentRoleRaw(String customerId) throws Exception {
    * Response.
    */
   Response assignPaymentRoleRaw(String customerId, CustomerAssignPaymentRoleParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/assign_payment_role", "customer-id", customerId);
@@ -309,7 +314,7 @@ Response assignPaymentRoleRaw(String customerId, CustomerAssignPaymentRoleParams
    * assignPaymentRole a customer using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response assignPaymentRoleRaw(String customerId, String jsonPayload) throws Exception {
+  Response assignPaymentRoleRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/assign_payment_role", "customer-id", customerId);
@@ -317,44 +322,58 @@ Response assignPaymentRoleRaw(String customerId, String jsonPayload) throws Exce
   }
 
   public CustomerAssignPaymentRoleResponse assignPaymentRole(
-      String customerId, CustomerAssignPaymentRoleParams params) throws Exception {
+      String customerId, CustomerAssignPaymentRoleParams params) throws ChargebeeException {
     Response response = assignPaymentRoleRaw(customerId, params);
     return CustomerAssignPaymentRoleResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** move a customer using immutable params (executes immediately) - returns raw Response. */
-  Response moveRaw(CustomerMoveParams params) throws Exception {
+  Response moveRaw(CustomerMoveParams params) throws ChargebeeException {
 
     return post("/customers/move", params != null ? params.toFormData() : null);
   }
 
   /** move a customer using raw JSON payload (executes immediately) - returns raw Response. */
-  Response moveRaw(String jsonPayload) throws Exception {
+  Response moveRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/customers/move", jsonPayload);
   }
 
-  public CustomerMoveResponse move(CustomerMoveParams params) throws Exception {
+  public CustomerMoveResponse move(CustomerMoveParams params) throws ChargebeeException {
     Response response = moveRaw(params);
 
     return CustomerMoveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** hierarchy a customer (executes immediately) - returns raw Response. */
-  Response hierarchyRaw(String customerId) throws Exception {
+  Response hierarchyRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/hierarchy", "customer-id", customerId);
 
     return get(path, null);
   }
 
-  public CustomerHierarchyResponse hierarchy(String customerId) throws Exception {
+  /** hierarchy a customer using immutable params (executes immediately) - returns raw Response. */
+  Response hierarchyRaw(String customerId, CustomerHierarchyParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/hierarchy", "customer-id", customerId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  public CustomerHierarchyResponse hierarchy(String customerId, CustomerHierarchyParams params)
+      throws ChargebeeException {
+    Response response = hierarchyRaw(customerId, params);
+    return CustomerHierarchyResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  public CustomerHierarchyResponse hierarchy(String customerId) throws ChargebeeException {
     Response response = hierarchyRaw(customerId);
     return CustomerHierarchyResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** updatePaymentMethod a customer (executes immediately) - returns raw Response. */
-  Response updatePaymentMethodRaw(String customerId) throws Exception {
+  Response updatePaymentMethodRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/update_payment_method", "customer-id", customerId);
@@ -367,7 +386,7 @@ Response updatePaymentMethodRaw(String customerId) throws Exception {
    * Response.
    */
   Response updatePaymentMethodRaw(String customerId, CustomerUpdatePaymentMethodParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/update_payment_method", "customer-id", customerId);
@@ -378,7 +397,7 @@ Response updatePaymentMethodRaw(String customerId, CustomerUpdatePaymentMethodPa
    * updatePaymentMethod a customer using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response updatePaymentMethodRaw(String customerId, String jsonPayload) throws Exception {
+  Response updatePaymentMethodRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/update_payment_method", "customer-id", customerId);
@@ -386,44 +405,44 @@ Response updatePaymentMethodRaw(String customerId, String jsonPayload) throws Ex
   }
 
   public CustomerUpdatePaymentMethodResponse updatePaymentMethod(
-      String customerId, CustomerUpdatePaymentMethodParams params) throws Exception {
+      String customerId, CustomerUpdatePaymentMethodParams params) throws ChargebeeException {
     Response response = updatePaymentMethodRaw(customerId, params);
     return CustomerUpdatePaymentMethodResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** retrieve a customer (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String customerId) throws Exception {
+  Response retrieveRaw(String customerId) throws ChargebeeException {
     String path = buildPathWithParams("/customers/{customer-id}", "customer-id", customerId);
 
     return get(path, null);
   }
 
-  public CustomerRetrieveResponse retrieve(String customerId) throws Exception {
+  public CustomerRetrieveResponse retrieve(String customerId) throws ChargebeeException {
     Response response = retrieveRaw(customerId);
     return CustomerRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a customer (executes immediately) - returns raw Response. */
-  Response updateRaw(String customerId) throws Exception {
+  Response updateRaw(String customerId) throws ChargebeeException {
     String path = buildPathWithParams("/customers/{customer-id}", "customer-id", customerId);
 
     return post(path, null);
   }
 
   /** update a customer using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String customerId, CustomerUpdateParams params) throws Exception {
+  Response updateRaw(String customerId, CustomerUpdateParams params) throws ChargebeeException {
     String path = buildPathWithParams("/customers/{customer-id}", "customer-id", customerId);
     return post(path, params.toFormData());
   }
 
   /** update a customer using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String customerId, String jsonPayload) throws Exception {
+  Response updateRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path = buildPathWithParams("/customers/{customer-id}", "customer-id", customerId);
     return postJson(path, jsonPayload);
   }
 
   public CustomerUpdateResponse update(String customerId, CustomerUpdateParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = updateRaw(customerId, params);
     return CustomerUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
@@ -433,7 +452,7 @@ public CustomerUpdateResponse update(String customerId, CustomerUpdateParams par
    * Response.
    */
   Response listHierarchyDetailRaw(String customerId, CustomerListHierarchyDetailParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/hierarchy_detail", "customer-id", customerId);
     return get(path, params != null ? params.toQueryParams() : null);
@@ -442,7 +461,7 @@ Response listHierarchyDetailRaw(String customerId, CustomerListHierarchyDetailPa
   /**
    * listHierarchyDetail a customer without params (executes immediately) - returns raw Response.
    */
-  Response listHierarchyDetailRaw(String customerId) throws Exception {
+  Response listHierarchyDetailRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/hierarchy_detail", "customer-id", customerId);
     return get(path, null);
@@ -452,28 +471,28 @@ Response listHierarchyDetailRaw(String customerId) throws Exception {
    * listHierarchyDetail a customer using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response listHierarchyDetailRaw(String customerId, String jsonPayload) throws Exception {
+  Response listHierarchyDetailRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/hierarchy_detail", "customer-id", customerId);
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public CustomerListHierarchyDetailResponse listHierarchyDetail(
-      String customerId, CustomerListHierarchyDetailParams params) throws Exception {
+      String customerId, CustomerListHierarchyDetailParams params) throws ChargebeeException {
     Response response = listHierarchyDetailRaw(customerId, params);
     return CustomerListHierarchyDetailResponse.fromJson(
         response.getBodyAsString(), this, params, customerId, response);
   }
 
   public CustomerListHierarchyDetailResponse listHierarchyDetail(String customerId)
-      throws Exception {
+      throws ChargebeeException {
     Response response = listHierarchyDetailRaw(customerId);
     return CustomerListHierarchyDetailResponse.fromJson(
         response.getBodyAsString(), this, null, customerId, response);
   }
 
   /** changeBillingDate a customer (executes immediately) - returns raw Response. */
-  Response changeBillingDateRaw(String customerId) throws Exception {
+  Response changeBillingDateRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/change_billing_date", "customer-id", customerId);
@@ -486,7 +505,7 @@ Response changeBillingDateRaw(String customerId) throws Exception {
    * Response.
    */
   Response changeBillingDateRaw(String customerId, CustomerChangeBillingDateParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/change_billing_date", "customer-id", customerId);
@@ -497,7 +516,7 @@ Response changeBillingDateRaw(String customerId, CustomerChangeBillingDateParams
    * changeBillingDate a customer using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response changeBillingDateRaw(String customerId, String jsonPayload) throws Exception {
+  Response changeBillingDateRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/change_billing_date", "customer-id", customerId);
@@ -505,60 +524,60 @@ Response changeBillingDateRaw(String customerId, String jsonPayload) throws Exce
   }
 
   public CustomerChangeBillingDateResponse changeBillingDate(
-      String customerId, CustomerChangeBillingDateParams params) throws Exception {
+      String customerId, CustomerChangeBillingDateParams params) throws ChargebeeException {
     Response response = changeBillingDateRaw(customerId, params);
     return CustomerChangeBillingDateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** list a customer using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(CustomerListParams params) throws Exception {
+  Response listRaw(CustomerListParams params) throws ChargebeeException {
 
     return get("/customers", params != null ? params.toQueryParams() : null);
   }
 
   /** list a customer without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/customers", null);
   }
 
   /** list a customer using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public CustomerListResponse list(CustomerListParams params) throws Exception {
+  public CustomerListResponse list(CustomerListParams params) throws ChargebeeException {
     Response response = listRaw(params);
 
     return CustomerListResponse.fromJson(response.getBodyAsString(), this, params, response);
   }
 
-  public CustomerListResponse list() throws Exception {
+  public CustomerListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return CustomerListResponse.fromJson(response.getBodyAsString(), this, null, response);
   }
 
   /** create a customer using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(CustomerCreateParams params) throws Exception {
+  Response createRaw(CustomerCreateParams params) throws ChargebeeException {
 
     return post("/customers", params != null ? params.toFormData() : null);
   }
 
   /** create a customer using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/customers", jsonPayload);
   }
 
-  public CustomerCreateResponse create(CustomerCreateParams params) throws Exception {
+  public CustomerCreateResponse create(CustomerCreateParams params) throws ChargebeeException {
     Response response = createRaw(params);
 
     return CustomerCreateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** addContact a customer (executes immediately) - returns raw Response. */
-  Response addContactRaw(String customerId) throws Exception {
+  Response addContactRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/add_contact", "customer-id", customerId);
 
@@ -566,21 +585,22 @@ Response addContactRaw(String customerId) throws Exception {
   }
 
   /** addContact a customer using immutable params (executes immediately) - returns raw Response. */
-  Response addContactRaw(String customerId, CustomerAddContactParams params) throws Exception {
+  Response addContactRaw(String customerId, CustomerAddContactParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/add_contact", "customer-id", customerId);
     return post(path, params.toFormData());
   }
 
   /** addContact a customer using raw JSON payload (executes immediately) - returns raw Response. */
-  Response addContactRaw(String customerId, String jsonPayload) throws Exception {
+  Response addContactRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/add_contact", "customer-id", customerId);
     return postJson(path, jsonPayload);
   }
 
   public CustomerAddContactResponse addContact(String customerId, CustomerAddContactParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = addContactRaw(customerId, params);
     return CustomerAddContactResponse.fromJson(response.getBodyAsString(), response);
   }
@@ -589,8 +609,8 @@ public CustomerAddContactResponse addContact(String customerId, CustomerAddConta
    * contactsForCustomer a customer using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response contactsForCustomerRaw(String customerId, CustomerContactsForCustomerParams params)
-      throws Exception {
+  Response contactsForCustomerRaw(String customerId, ContactsForCustomerParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/contacts", "customer-id", customerId);
     return get(path, params != null ? params.toQueryParams() : null);
@@ -599,7 +619,7 @@ Response contactsForCustomerRaw(String customerId, CustomerContactsForCustomerPa
   /**
    * contactsForCustomer a customer without params (executes immediately) - returns raw Response.
    */
-  Response contactsForCustomerRaw(String customerId) throws Exception {
+  Response contactsForCustomerRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/contacts", "customer-id", customerId);
     return get(path, null);
@@ -609,28 +629,28 @@ Response contactsForCustomerRaw(String customerId) throws Exception {
    * contactsForCustomer a customer using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response contactsForCustomerRaw(String customerId, String jsonPayload) throws Exception {
+  Response contactsForCustomerRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/contacts", "customer-id", customerId);
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public CustomerContactsForCustomerResponse contactsForCustomer(
-      String customerId, CustomerContactsForCustomerParams params) throws Exception {
+  public ContactsForCustomerResponse contactsForCustomer(
+      String customerId, ContactsForCustomerParams params) throws ChargebeeException {
     Response response = contactsForCustomerRaw(customerId, params);
-    return CustomerContactsForCustomerResponse.fromJson(
+    return ContactsForCustomerResponse.fromJson(
         response.getBodyAsString(), this, params, customerId, response);
   }
 
-  public CustomerContactsForCustomerResponse contactsForCustomer(String customerId)
-      throws Exception {
+  public ContactsForCustomerResponse contactsForCustomer(String customerId)
+      throws ChargebeeException {
     Response response = contactsForCustomerRaw(customerId);
-    return CustomerContactsForCustomerResponse.fromJson(
+    return ContactsForCustomerResponse.fromJson(
         response.getBodyAsString(), this, null, customerId, response);
   }
 
   /** deductPromotionalCredits a customer (executes immediately) - returns raw Response. */
-  Response deductPromotionalCreditsRaw(String customerId) throws Exception {
+  Response deductPromotionalCreditsRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/deduct_promotional_credits", "customer-id", customerId);
@@ -643,7 +663,7 @@ Response deductPromotionalCreditsRaw(String customerId) throws Exception {
    * Response.
    */
   Response deductPromotionalCreditsRaw(
-      String customerId, CustomerDeductPromotionalCreditsParams params) throws Exception {
+      String customerId, CustomerDeductPromotionalCreditsParams params) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/deduct_promotional_credits", "customer-id", customerId);
@@ -654,7 +674,8 @@ Response deductPromotionalCreditsRaw(
    * deductPromotionalCredits a customer using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response deductPromotionalCreditsRaw(String customerId, String jsonPayload) throws Exception {
+  Response deductPromotionalCreditsRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/deduct_promotional_credits", "customer-id", customerId);
@@ -662,13 +683,13 @@ Response deductPromotionalCreditsRaw(String customerId, String jsonPayload) thro
   }
 
   public CustomerDeductPromotionalCreditsResponse deductPromotionalCredits(
-      String customerId, CustomerDeductPromotionalCreditsParams params) throws Exception {
+      String customerId, CustomerDeductPromotionalCreditsParams params) throws ChargebeeException {
     Response response = deductPromotionalCreditsRaw(customerId, params);
     return CustomerDeductPromotionalCreditsResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** clearPersonalData a customer (executes immediately) - returns raw Response. */
-  Response clearPersonalDataRaw(String customerId) throws Exception {
+  Response clearPersonalDataRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/clear_personal_data", "customer-id", customerId);
@@ -676,31 +697,32 @@ Response clearPersonalDataRaw(String customerId) throws Exception {
     return post(path, null);
   }
 
-  public CustomerClearPersonalDataResponse clearPersonalData(String customerId) throws Exception {
+  public CustomerClearPersonalDataResponse clearPersonalData(String customerId)
+      throws ChargebeeException {
     Response response = clearPersonalDataRaw(customerId);
     return CustomerClearPersonalDataResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** merge a customer using immutable params (executes immediately) - returns raw Response. */
-  Response mergeRaw(CustomerMergeParams params) throws Exception {
+  Response mergeRaw(CustomerMergeParams params) throws ChargebeeException {
 
     return post("/customers/merge", params != null ? params.toFormData() : null);
   }
 
   /** merge a customer using raw JSON payload (executes immediately) - returns raw Response. */
-  Response mergeRaw(String jsonPayload) throws Exception {
+  Response mergeRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/customers/merge", jsonPayload);
   }
 
-  public CustomerMergeResponse merge(CustomerMergeParams params) throws Exception {
+  public CustomerMergeResponse merge(CustomerMergeParams params) throws ChargebeeException {
     Response response = mergeRaw(params);
 
     return CustomerMergeResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** collectPayment a customer (executes immediately) - returns raw Response. */
-  Response collectPaymentRaw(String customerId) throws Exception {
+  Response collectPaymentRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/collect_payment", "customer-id", customerId);
 
@@ -711,7 +733,7 @@ Response collectPaymentRaw(String customerId) throws Exception {
    * collectPayment a customer using immutable params (executes immediately) - returns raw Response.
    */
   Response collectPaymentRaw(String customerId, CustomerCollectPaymentParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/collect_payment", "customer-id", customerId);
     return post(path, params.toFormData());
@@ -720,20 +742,20 @@ Response collectPaymentRaw(String customerId, CustomerCollectPaymentParams param
   /**
    * collectPayment a customer using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response collectPaymentRaw(String customerId, String jsonPayload) throws Exception {
+  Response collectPaymentRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/collect_payment", "customer-id", customerId);
     return postJson(path, jsonPayload);
   }
 
   public CustomerCollectPaymentResponse collectPayment(
-      String customerId, CustomerCollectPaymentParams params) throws Exception {
+      String customerId, CustomerCollectPaymentParams params) throws ChargebeeException {
     Response response = collectPaymentRaw(customerId, params);
     return CustomerCollectPaymentResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** recordExcessPayment a customer (executes immediately) - returns raw Response. */
-  Response recordExcessPaymentRaw(String customerId) throws Exception {
+  Response recordExcessPaymentRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/record_excess_payment", "customer-id", customerId);
@@ -746,7 +768,7 @@ Response recordExcessPaymentRaw(String customerId) throws Exception {
    * Response.
    */
   Response recordExcessPaymentRaw(String customerId, CustomerRecordExcessPaymentParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/record_excess_payment", "customer-id", customerId);
@@ -757,7 +779,7 @@ Response recordExcessPaymentRaw(String customerId, CustomerRecordExcessPaymentPa
    * recordExcessPayment a customer using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response recordExcessPaymentRaw(String customerId, String jsonPayload) throws Exception {
+  Response recordExcessPaymentRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/record_excess_payment", "customer-id", customerId);
@@ -765,13 +787,13 @@ Response recordExcessPaymentRaw(String customerId, String jsonPayload) throws Ex
   }
 
   public CustomerRecordExcessPaymentResponse recordExcessPayment(
-      String customerId, CustomerRecordExcessPaymentParams params) throws Exception {
+      String customerId, CustomerRecordExcessPaymentParams params) throws ChargebeeException {
     Response response = recordExcessPaymentRaw(customerId, params);
     return CustomerRecordExcessPaymentResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** setPromotionalCredits a customer (executes immediately) - returns raw Response. */
-  Response setPromotionalCreditsRaw(String customerId) throws Exception {
+  Response setPromotionalCreditsRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/set_promotional_credits", "customer-id", customerId);
@@ -784,7 +806,7 @@ Response setPromotionalCreditsRaw(String customerId) throws Exception {
    * Response.
    */
   Response setPromotionalCreditsRaw(String customerId, CustomerSetPromotionalCreditsParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/set_promotional_credits", "customer-id", customerId);
@@ -795,7 +817,8 @@ Response setPromotionalCreditsRaw(String customerId, CustomerSetPromotionalCredi
    * setPromotionalCredits a customer using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response setPromotionalCreditsRaw(String customerId, String jsonPayload) throws Exception {
+  Response setPromotionalCreditsRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/set_promotional_credits", "customer-id", customerId);
@@ -803,13 +826,13 @@ Response setPromotionalCreditsRaw(String customerId, String jsonPayload) throws
   }
 
   public CustomerSetPromotionalCreditsResponse setPromotionalCredits(
-      String customerId, CustomerSetPromotionalCreditsParams params) throws Exception {
+      String customerId, CustomerSetPromotionalCreditsParams params) throws ChargebeeException {
     Response response = setPromotionalCreditsRaw(customerId, params);
     return CustomerSetPromotionalCreditsResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** updateContact a customer (executes immediately) - returns raw Response. */
-  Response updateContactRaw(String customerId) throws Exception {
+  Response updateContactRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/update_contact", "customer-id", customerId);
 
@@ -820,7 +843,7 @@ Response updateContactRaw(String customerId) throws Exception {
    * updateContact a customer using immutable params (executes immediately) - returns raw Response.
    */
   Response updateContactRaw(String customerId, CustomerUpdateContactParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/update_contact", "customer-id", customerId);
     return post(path, params.toFormData());
@@ -829,20 +852,20 @@ Response updateContactRaw(String customerId, CustomerUpdateContactParams params)
   /**
    * updateContact a customer using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response updateContactRaw(String customerId, String jsonPayload) throws Exception {
+  Response updateContactRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/update_contact", "customer-id", customerId);
     return postJson(path, jsonPayload);
   }
 
   public CustomerUpdateContactResponse updateContact(
-      String customerId, CustomerUpdateContactParams params) throws Exception {
+      String customerId, CustomerUpdateContactParams params) throws ChargebeeException {
     Response response = updateContactRaw(customerId, params);
     return CustomerUpdateContactResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** updateHierarchySettings a customer (executes immediately) - returns raw Response. */
-  Response updateHierarchySettingsRaw(String customerId) throws Exception {
+  Response updateHierarchySettingsRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/update_hierarchy_settings", "customer-id", customerId);
@@ -855,7 +878,7 @@ Response updateHierarchySettingsRaw(String customerId) throws Exception {
    * Response.
    */
   Response updateHierarchySettingsRaw(
-      String customerId, CustomerUpdateHierarchySettingsParams params) throws Exception {
+      String customerId, CustomerUpdateHierarchySettingsParams params) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/update_hierarchy_settings", "customer-id", customerId);
@@ -866,7 +889,8 @@ Response updateHierarchySettingsRaw(
    * updateHierarchySettings a customer using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response updateHierarchySettingsRaw(String customerId, String jsonPayload) throws Exception {
+  Response updateHierarchySettingsRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/update_hierarchy_settings", "customer-id", customerId);
@@ -874,13 +898,13 @@ Response updateHierarchySettingsRaw(String customerId, String jsonPayload) throw
   }
 
   public CustomerUpdateHierarchySettingsResponse updateHierarchySettings(
-      String customerId, CustomerUpdateHierarchySettingsParams params) throws Exception {
+      String customerId, CustomerUpdateHierarchySettingsParams params) throws ChargebeeException {
     Response response = updateHierarchySettingsRaw(customerId, params);
     return CustomerUpdateHierarchySettingsResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** updateBillingInfo a customer (executes immediately) - returns raw Response. */
-  Response updateBillingInfoRaw(String customerId) throws Exception {
+  Response updateBillingInfoRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/update_billing_info", "customer-id", customerId);
@@ -893,7 +917,7 @@ Response updateBillingInfoRaw(String customerId) throws Exception {
    * Response.
    */
   Response updateBillingInfoRaw(String customerId, CustomerUpdateBillingInfoParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/update_billing_info", "customer-id", customerId);
@@ -904,7 +928,7 @@ Response updateBillingInfoRaw(String customerId, CustomerUpdateBillingInfoParams
    * updateBillingInfo a customer using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response updateBillingInfoRaw(String customerId, String jsonPayload) throws Exception {
+  Response updateBillingInfoRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/update_billing_info", "customer-id", customerId);
@@ -912,7 +936,7 @@ Response updateBillingInfoRaw(String customerId, String jsonPayload) throws Exce
   }
 
   public CustomerUpdateBillingInfoResponse updateBillingInfo(
-      String customerId, CustomerUpdateBillingInfoParams params) throws Exception {
+      String customerId, CustomerUpdateBillingInfoParams params) throws ChargebeeException {
     Response response = updateBillingInfoRaw(customerId, params);
     return CustomerUpdateBillingInfoResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/services/DifferentialPriceService.java b/src/main/java/com/chargebee/v4/services/DifferentialPriceService.java
new file mode 100644
index 00000000..5d9884a8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/DifferentialPriceService.java
@@ -0,0 +1,268 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.differentialPrice.params.DifferentialPriceDeleteParams;
+
+import com.chargebee.v4.models.differentialPrice.params.DifferentialPriceCreateParams;
+
+import com.chargebee.v4.models.differentialPrice.params.DifferentialPriceListParams;
+
+import com.chargebee.v4.models.differentialPrice.params.DifferentialPriceRetrieveParams;
+
+import com.chargebee.v4.models.differentialPrice.params.DifferentialPriceUpdateParams;
+
+import com.chargebee.v4.models.differentialPrice.responses.DifferentialPriceDeleteResponse;
+
+import com.chargebee.v4.models.differentialPrice.responses.DifferentialPriceCreateResponse;
+
+import com.chargebee.v4.models.differentialPrice.responses.DifferentialPriceListResponse;
+
+import com.chargebee.v4.models.differentialPrice.responses.DifferentialPriceRetrieveResponse;
+
+import com.chargebee.v4.models.differentialPrice.responses.DifferentialPriceUpdateResponse;
+
+public final class DifferentialPriceService extends BaseService<DifferentialPriceService> {
+
+  private final ServiceConfig config;
+
+  public DifferentialPriceService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private DifferentialPriceService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private DifferentialPriceService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  DifferentialPriceService with(RequestOptions newOptions) {
+    return new DifferentialPriceService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public DifferentialPriceService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** delete a differentialPrice (executes immediately) - returns raw Response. */
+  Response deleteRaw(String differentialPriceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/differential_prices/{differential-price-id}/delete",
+            "differential-price-id",
+            differentialPriceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * delete a differentialPrice using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response deleteRaw(String differentialPriceId, DifferentialPriceDeleteParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/differential_prices/{differential-price-id}/delete",
+            "differential-price-id",
+            differentialPriceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * delete a differentialPrice using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response deleteRaw(String differentialPriceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/differential_prices/{differential-price-id}/delete",
+            "differential-price-id",
+            differentialPriceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public DifferentialPriceDeleteResponse delete(
+      String differentialPriceId, DifferentialPriceDeleteParams params) throws ChargebeeException {
+    Response response = deleteRaw(differentialPriceId, params);
+    return DifferentialPriceDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** create a differentialPrice (executes immediately) - returns raw Response. */
+  Response createRaw(String itemPriceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/item_prices/{item-price-id}/differential_prices", "item-price-id", itemPriceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * create a differentialPrice using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response createRaw(String itemPriceId, DifferentialPriceCreateParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/item_prices/{item-price-id}/differential_prices", "item-price-id", itemPriceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * create a differentialPrice using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response createRaw(String itemPriceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/item_prices/{item-price-id}/differential_prices", "item-price-id", itemPriceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public DifferentialPriceCreateResponse create(
+      String itemPriceId, DifferentialPriceCreateParams params) throws ChargebeeException {
+    Response response = createRaw(itemPriceId, params);
+    return DifferentialPriceCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * list a differentialPrice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response listRaw(DifferentialPriceListParams params) throws ChargebeeException {
+
+    return get("/differential_prices", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a differentialPrice without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/differential_prices", null);
+  }
+
+  /**
+   * list a differentialPrice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public DifferentialPriceListResponse list(DifferentialPriceListParams params)
+      throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return DifferentialPriceListResponse.fromJson(
+        response.getBodyAsString(), this, params, response);
+  }
+
+  public DifferentialPriceListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return DifferentialPriceListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** retrieve a differentialPrice (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String differentialPriceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/differential_prices/{differential-price-id}",
+            "differential-price-id",
+            differentialPriceId);
+
+    return get(path, null);
+  }
+
+  /**
+   * retrieve a differentialPrice using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response retrieveRaw(String differentialPriceId, DifferentialPriceRetrieveParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/differential_prices/{differential-price-id}",
+            "differential-price-id",
+            differentialPriceId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  public DifferentialPriceRetrieveResponse retrieve(
+      String differentialPriceId, DifferentialPriceRetrieveParams params)
+      throws ChargebeeException {
+    Response response = retrieveRaw(differentialPriceId, params);
+    return DifferentialPriceRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  public DifferentialPriceRetrieveResponse retrieve(String differentialPriceId)
+      throws ChargebeeException {
+    Response response = retrieveRaw(differentialPriceId);
+    return DifferentialPriceRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** update a differentialPrice (executes immediately) - returns raw Response. */
+  Response updateRaw(String differentialPriceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/differential_prices/{differential-price-id}",
+            "differential-price-id",
+            differentialPriceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * update a differentialPrice using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response updateRaw(String differentialPriceId, DifferentialPriceUpdateParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/differential_prices/{differential-price-id}",
+            "differential-price-id",
+            differentialPriceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * update a differentialPrice using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response updateRaw(String differentialPriceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/differential_prices/{differential-price-id}",
+            "differential-price-id",
+            differentialPriceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public DifferentialPriceUpdateResponse update(
+      String differentialPriceId, DifferentialPriceUpdateParams params) throws ChargebeeException {
+    Response response = updateRaw(differentialPriceId, params);
+    return DifferentialPriceUpdateResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/EntitlementOverrideService.java b/src/main/java/com/chargebee/v4/services/EntitlementOverrideService.java
new file mode 100644
index 00000000..96428647
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/EntitlementOverrideService.java
@@ -0,0 +1,167 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.entitlementOverride.params.ListEntitlementOverrideForSubscriptionParams;
+
+import com.chargebee.v4.models.entitlementOverride.params.AddEntitlementOverrideForSubscriptionParams;
+
+import com.chargebee.v4.models.entitlementOverride.responses.ListEntitlementOverrideForSubscriptionResponse;
+
+import com.chargebee.v4.models.entitlementOverride.responses.AddEntitlementOverrideForSubscriptionResponse;
+
+public final class EntitlementOverrideService extends BaseService<EntitlementOverrideService> {
+
+  private final ServiceConfig config;
+
+  public EntitlementOverrideService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private EntitlementOverrideService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private EntitlementOverrideService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  EntitlementOverrideService with(RequestOptions newOptions) {
+    return new EntitlementOverrideService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public EntitlementOverrideService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * listEntitlementOverrideForSubscription a entitlementOverride using immutable params (executes
+   * immediately) - returns raw Response.
+   */
+  Response listEntitlementOverrideForSubscriptionRaw(
+      String subscriptionId, ListEntitlementOverrideForSubscriptionParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/entitlement_overrides",
+            "subscription-id",
+            subscriptionId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * listEntitlementOverrideForSubscription a entitlementOverride without params (executes
+   * immediately) - returns raw Response.
+   */
+  Response listEntitlementOverrideForSubscriptionRaw(String subscriptionId)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/entitlement_overrides",
+            "subscription-id",
+            subscriptionId);
+    return get(path, null);
+  }
+
+  /**
+   * listEntitlementOverrideForSubscription a entitlementOverride using raw JSON payload (executes
+   * immediately) - returns raw Response.
+   */
+  Response listEntitlementOverrideForSubscriptionRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/entitlement_overrides",
+            "subscription-id",
+            subscriptionId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public ListEntitlementOverrideForSubscriptionResponse listEntitlementOverrideForSubscription(
+      String subscriptionId, ListEntitlementOverrideForSubscriptionParams params)
+      throws ChargebeeException {
+    Response response = listEntitlementOverrideForSubscriptionRaw(subscriptionId, params);
+    return ListEntitlementOverrideForSubscriptionResponse.fromJson(
+        response.getBodyAsString(), this, params, subscriptionId, response);
+  }
+
+  public ListEntitlementOverrideForSubscriptionResponse listEntitlementOverrideForSubscription(
+      String subscriptionId) throws ChargebeeException {
+    Response response = listEntitlementOverrideForSubscriptionRaw(subscriptionId);
+    return ListEntitlementOverrideForSubscriptionResponse.fromJson(
+        response.getBodyAsString(), this, null, subscriptionId, response);
+  }
+
+  /**
+   * addEntitlementOverrideForSubscription a entitlementOverride (executes immediately) - returns
+   * raw Response.
+   */
+  Response addEntitlementOverrideForSubscriptionRaw(String subscriptionId)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/entitlement_overrides",
+            "subscription-id",
+            subscriptionId);
+
+    return post(path, null);
+  }
+
+  /**
+   * addEntitlementOverrideForSubscription a entitlementOverride using immutable params (executes
+   * immediately) - returns raw Response.
+   */
+  Response addEntitlementOverrideForSubscriptionRaw(
+      String subscriptionId, AddEntitlementOverrideForSubscriptionParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/entitlement_overrides",
+            "subscription-id",
+            subscriptionId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * addEntitlementOverrideForSubscription a entitlementOverride using raw JSON payload (executes
+   * immediately) - returns raw Response.
+   */
+  Response addEntitlementOverrideForSubscriptionRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/entitlement_overrides",
+            "subscription-id",
+            subscriptionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public AddEntitlementOverrideForSubscriptionResponse addEntitlementOverrideForSubscription(
+      String subscriptionId, AddEntitlementOverrideForSubscriptionParams params)
+      throws ChargebeeException {
+    Response response = addEntitlementOverrideForSubscriptionRaw(subscriptionId, params);
+    return AddEntitlementOverrideForSubscriptionResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/EntitlementService.java b/src/main/java/com/chargebee/v4/services/EntitlementService.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/services/EntitlementService.java
rename to src/main/java/com/chargebee/v4/services/EntitlementService.java
index da1dc62c..d1dac0b8 100644
--- a/src/main/java/com/chargebee/v4/core/services/EntitlementService.java
+++ b/src/main/java/com/chargebee/v4/services/EntitlementService.java
@@ -5,19 +5,20 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.entitlement.params.EntitlementListParams;
+import com.chargebee.v4.models.entitlement.params.EntitlementListParams;
 
-import com.chargebee.v4.core.models.entitlement.params.EntitlementCreateParams;
+import com.chargebee.v4.models.entitlement.params.EntitlementCreateParams;
 
-import com.chargebee.v4.core.responses.entitlement.EntitlementListResponse;
+import com.chargebee.v4.models.entitlement.responses.EntitlementListResponse;
 
-import com.chargebee.v4.core.responses.entitlement.EntitlementCreateResponse;
+import com.chargebee.v4.models.entitlement.responses.EntitlementCreateResponse;
 
 public final class EntitlementService extends BaseService<EntitlementService> {
 
@@ -54,47 +55,48 @@ public EntitlementService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** list a entitlement using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(EntitlementListParams params) throws Exception {
+  Response listRaw(EntitlementListParams params) throws ChargebeeException {
 
     return get("/entitlements", params != null ? params.toQueryParams() : null);
   }
 
   /** list a entitlement without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/entitlements", null);
   }
 
   /** list a entitlement using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public EntitlementListResponse list(EntitlementListParams params) throws Exception {
+  public EntitlementListResponse list(EntitlementListParams params) throws ChargebeeException {
     Response response = listRaw(params);
 
     return EntitlementListResponse.fromJson(response.getBodyAsString(), this, params, response);
   }
 
-  public EntitlementListResponse list() throws Exception {
+  public EntitlementListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return EntitlementListResponse.fromJson(response.getBodyAsString(), this, null, response);
   }
 
   /** create a entitlement using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(EntitlementCreateParams params) throws Exception {
+  Response createRaw(EntitlementCreateParams params) throws ChargebeeException {
 
     return post("/entitlements", params != null ? params.toFormData() : null);
   }
 
   /** create a entitlement using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/entitlements", jsonPayload);
   }
 
-  public EntitlementCreateResponse create(EntitlementCreateParams params) throws Exception {
+  public EntitlementCreateResponse create(EntitlementCreateParams params)
+      throws ChargebeeException {
     Response response = createRaw(params);
 
     return EntitlementCreateResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/services/EstimateService.java b/src/main/java/com/chargebee/v4/services/EstimateService.java
new file mode 100644
index 00000000..3ec4de4a
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/EstimateService.java
@@ -0,0 +1,813 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.estimate.params.RenewalEstimateParams;
+
+import com.chargebee.v4.models.estimate.params.CreateSubscriptionItemEstimateParams;
+
+import com.chargebee.v4.models.estimate.params.EstimatePaymentSchedulesParams;
+
+import com.chargebee.v4.models.estimate.params.EstimateCancelSubscriptionForItemsParams;
+
+import com.chargebee.v4.models.estimate.params.EstimateResumeSubscriptionParams;
+
+import com.chargebee.v4.models.estimate.params.EstimateCreateInvoiceForItemsParams;
+
+import com.chargebee.v4.models.estimate.params.EstimateGiftSubscriptionForItemsParams;
+
+import com.chargebee.v4.models.estimate.params.EstimateUpdateSubscriptionForItemsParams;
+
+import com.chargebee.v4.models.estimate.params.RegenerateInvoiceEstimateParams;
+
+import com.chargebee.v4.models.estimate.params.CreateSubscriptionItemForCustomerEstimateParams;
+
+import com.chargebee.v4.models.estimate.params.EstimateChangeTermEndParams;
+
+import com.chargebee.v4.models.estimate.params.EstimatePauseSubscriptionParams;
+
+import com.chargebee.v4.models.estimate.params.AdvanceInvoiceEstimateParams;
+
+import com.chargebee.v4.models.estimate.params.EstimateUpdateSubscriptionParams;
+
+import com.chargebee.v4.models.estimate.params.EstimateGiftSubscriptionParams;
+
+import com.chargebee.v4.models.estimate.params.CreateSubscriptionForCustomerEstimateParams;
+
+import com.chargebee.v4.models.estimate.params.EstimateCreateSubscriptionParams;
+
+import com.chargebee.v4.models.estimate.params.EstimateCreateInvoiceParams;
+
+import com.chargebee.v4.models.estimate.params.EstimateCancelSubscriptionParams;
+
+import com.chargebee.v4.models.estimate.responses.RenewalEstimateResponse;
+
+import com.chargebee.v4.models.estimate.responses.CreateSubscriptionItemEstimateResponse;
+
+import com.chargebee.v4.models.estimate.responses.EstimatePaymentSchedulesResponse;
+
+import com.chargebee.v4.models.estimate.responses.EstimateCancelSubscriptionForItemsResponse;
+
+import com.chargebee.v4.models.estimate.responses.EstimateResumeSubscriptionResponse;
+
+import com.chargebee.v4.models.estimate.responses.EstimateCreateInvoiceForItemsResponse;
+
+import com.chargebee.v4.models.estimate.responses.EstimateGiftSubscriptionForItemsResponse;
+
+import com.chargebee.v4.models.estimate.responses.EstimateUpdateSubscriptionForItemsResponse;
+
+import com.chargebee.v4.models.estimate.responses.UpcomingInvoicesEstimateResponse;
+
+import com.chargebee.v4.models.estimate.responses.RegenerateInvoiceEstimateResponse;
+
+import com.chargebee.v4.models.estimate.responses.CreateSubscriptionItemForCustomerEstimateResponse;
+
+import com.chargebee.v4.models.estimate.responses.EstimateChangeTermEndResponse;
+
+import com.chargebee.v4.models.estimate.responses.EstimatePauseSubscriptionResponse;
+
+import com.chargebee.v4.models.estimate.responses.AdvanceInvoiceEstimateResponse;
+
+import com.chargebee.v4.models.estimate.responses.EstimateUpdateSubscriptionResponse;
+
+import com.chargebee.v4.models.estimate.responses.EstimateGiftSubscriptionResponse;
+
+import com.chargebee.v4.models.estimate.responses.CreateSubscriptionForCustomerEstimateResponse;
+
+import com.chargebee.v4.models.estimate.responses.EstimateCreateSubscriptionResponse;
+
+import com.chargebee.v4.models.estimate.responses.EstimateCreateInvoiceResponse;
+
+import com.chargebee.v4.models.estimate.responses.EstimateCancelSubscriptionResponse;
+
+public final class EstimateService extends BaseService<EstimateService> {
+
+  private final ServiceConfig config;
+
+  public EstimateService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private EstimateService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private EstimateService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  EstimateService with(RequestOptions newOptions) {
+    return new EstimateService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public EstimateService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** renewalEstimate a estimate (executes immediately) - returns raw Response. */
+  Response renewalEstimateRaw(String subscriptionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/renewal_estimate", "subscription-id", subscriptionId);
+
+    return get(path, null);
+  }
+
+  /**
+   * renewalEstimate a estimate using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response renewalEstimateRaw(String subscriptionId, RenewalEstimateParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/renewal_estimate", "subscription-id", subscriptionId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  public RenewalEstimateResponse renewalEstimate(
+      String subscriptionId, RenewalEstimateParams params) throws ChargebeeException {
+    Response response = renewalEstimateRaw(subscriptionId, params);
+    return RenewalEstimateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  public RenewalEstimateResponse renewalEstimate(String subscriptionId) throws ChargebeeException {
+    Response response = renewalEstimateRaw(subscriptionId);
+    return RenewalEstimateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createSubscriptionItemEstimate a estimate using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response createSubscriptionItemEstimateRaw(CreateSubscriptionItemEstimateParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/estimates/create_subscription_for_items", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createSubscriptionItemEstimate a estimate using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response createSubscriptionItemEstimateRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/estimates/create_subscription_for_items", jsonPayload);
+  }
+
+  public CreateSubscriptionItemEstimateResponse createSubscriptionItemEstimate(
+      CreateSubscriptionItemEstimateParams params) throws ChargebeeException {
+    Response response = createSubscriptionItemEstimateRaw(params);
+
+    return CreateSubscriptionItemEstimateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * paymentSchedules a estimate using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response paymentSchedulesRaw(EstimatePaymentSchedulesParams params) throws ChargebeeException {
+
+    return post("/estimates/payment_schedules", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * paymentSchedules a estimate using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response paymentSchedulesRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/estimates/payment_schedules", jsonPayload);
+  }
+
+  public EstimatePaymentSchedulesResponse paymentSchedules(EstimatePaymentSchedulesParams params)
+      throws ChargebeeException {
+    Response response = paymentSchedulesRaw(params);
+
+    return EstimatePaymentSchedulesResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** cancelSubscriptionForItems a estimate (executes immediately) - returns raw Response. */
+  Response cancelSubscriptionForItemsRaw(String subscriptionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/cancel_subscription_for_items_estimate",
+            "subscription-id",
+            subscriptionId);
+
+    return post(path, null);
+  }
+
+  /**
+   * cancelSubscriptionForItems a estimate using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response cancelSubscriptionForItemsRaw(
+      String subscriptionId, EstimateCancelSubscriptionForItemsParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/cancel_subscription_for_items_estimate",
+            "subscription-id",
+            subscriptionId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * cancelSubscriptionForItems a estimate using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response cancelSubscriptionForItemsRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/cancel_subscription_for_items_estimate",
+            "subscription-id",
+            subscriptionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public EstimateCancelSubscriptionForItemsResponse cancelSubscriptionForItems(
+      String subscriptionId, EstimateCancelSubscriptionForItemsParams params)
+      throws ChargebeeException {
+    Response response = cancelSubscriptionForItemsRaw(subscriptionId, params);
+    return EstimateCancelSubscriptionForItemsResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /** resumeSubscription a estimate (executes immediately) - returns raw Response. */
+  Response resumeSubscriptionRaw(String subscriptionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/resume_subscription_estimate",
+            "subscription-id",
+            subscriptionId);
+
+    return post(path, null);
+  }
+
+  /**
+   * resumeSubscription a estimate using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response resumeSubscriptionRaw(String subscriptionId, EstimateResumeSubscriptionParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/resume_subscription_estimate",
+            "subscription-id",
+            subscriptionId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * resumeSubscription a estimate using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response resumeSubscriptionRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/resume_subscription_estimate",
+            "subscription-id",
+            subscriptionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public EstimateResumeSubscriptionResponse resumeSubscription(
+      String subscriptionId, EstimateResumeSubscriptionParams params) throws ChargebeeException {
+    Response response = resumeSubscriptionRaw(subscriptionId, params);
+    return EstimateResumeSubscriptionResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createInvoiceForItems a estimate using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response createInvoiceForItemsRaw(EstimateCreateInvoiceForItemsParams params)
+      throws ChargebeeException {
+
+    return post("/estimates/create_invoice_for_items", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createInvoiceForItems a estimate using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response createInvoiceForItemsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/estimates/create_invoice_for_items", jsonPayload);
+  }
+
+  public EstimateCreateInvoiceForItemsResponse createInvoiceForItems(
+      EstimateCreateInvoiceForItemsParams params) throws ChargebeeException {
+    Response response = createInvoiceForItemsRaw(params);
+
+    return EstimateCreateInvoiceForItemsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * giftSubscriptionForItems a estimate using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response giftSubscriptionForItemsRaw(EstimateGiftSubscriptionForItemsParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/estimates/gift_subscription_for_items", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * giftSubscriptionForItems a estimate using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response giftSubscriptionForItemsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/estimates/gift_subscription_for_items", jsonPayload);
+  }
+
+  public EstimateGiftSubscriptionForItemsResponse giftSubscriptionForItems(
+      EstimateGiftSubscriptionForItemsParams params) throws ChargebeeException {
+    Response response = giftSubscriptionForItemsRaw(params);
+
+    return EstimateGiftSubscriptionForItemsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * updateSubscriptionForItems a estimate using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response updateSubscriptionForItemsRaw(EstimateUpdateSubscriptionForItemsParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/estimates/update_subscription_for_items", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * updateSubscriptionForItems a estimate using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response updateSubscriptionForItemsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/estimates/update_subscription_for_items", jsonPayload);
+  }
+
+  public EstimateUpdateSubscriptionForItemsResponse updateSubscriptionForItems(
+      EstimateUpdateSubscriptionForItemsParams params) throws ChargebeeException {
+    Response response = updateSubscriptionForItemsRaw(params);
+
+    return EstimateUpdateSubscriptionForItemsResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /** upcomingInvoicesEstimate a estimate (executes immediately) - returns raw Response. */
+  Response upcomingInvoicesEstimateRaw(String customerId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/customers/{customer-id}/upcoming_invoices_estimate", "customer-id", customerId);
+
+    return get(path, null);
+  }
+
+  public UpcomingInvoicesEstimateResponse upcomingInvoicesEstimate(String customerId)
+      throws ChargebeeException {
+    Response response = upcomingInvoicesEstimateRaw(customerId);
+    return UpcomingInvoicesEstimateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** regenerateInvoiceEstimate a estimate (executes immediately) - returns raw Response. */
+  Response regenerateInvoiceEstimateRaw(String subscriptionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/regenerate_invoice_estimate",
+            "subscription-id",
+            subscriptionId);
+
+    return post(path, null);
+  }
+
+  /**
+   * regenerateInvoiceEstimate a estimate using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response regenerateInvoiceEstimateRaw(
+      String subscriptionId, RegenerateInvoiceEstimateParams params) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/regenerate_invoice_estimate",
+            "subscription-id",
+            subscriptionId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * regenerateInvoiceEstimate a estimate using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response regenerateInvoiceEstimateRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/regenerate_invoice_estimate",
+            "subscription-id",
+            subscriptionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public RegenerateInvoiceEstimateResponse regenerateInvoiceEstimate(
+      String subscriptionId, RegenerateInvoiceEstimateParams params) throws ChargebeeException {
+    Response response = regenerateInvoiceEstimateRaw(subscriptionId, params);
+    return RegenerateInvoiceEstimateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createSubscriptionItemForCustomerEstimate a estimate (executes immediately) - returns raw
+   * Response.
+   */
+  Response createSubscriptionItemForCustomerEstimateRaw(String customerId)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/customers/{customer-id}/create_subscription_for_items_estimate",
+            "customer-id",
+            customerId);
+
+    return post(path, null);
+  }
+
+  /**
+   * createSubscriptionItemForCustomerEstimate a estimate using immutable params (executes
+   * immediately) - returns raw Response.
+   */
+  Response createSubscriptionItemForCustomerEstimateRaw(
+      String customerId, CreateSubscriptionItemForCustomerEstimateParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/customers/{customer-id}/create_subscription_for_items_estimate",
+            "customer-id",
+            customerId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * createSubscriptionItemForCustomerEstimate a estimate using raw JSON payload (executes
+   * immediately) - returns raw Response.
+   */
+  Response createSubscriptionItemForCustomerEstimateRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/customers/{customer-id}/create_subscription_for_items_estimate",
+            "customer-id",
+            customerId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CreateSubscriptionItemForCustomerEstimateResponse
+      createSubscriptionItemForCustomerEstimate(
+          String customerId, CreateSubscriptionItemForCustomerEstimateParams params)
+          throws ChargebeeException {
+    Response response = createSubscriptionItemForCustomerEstimateRaw(customerId, params);
+    return CreateSubscriptionItemForCustomerEstimateResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /** changeTermEnd a estimate (executes immediately) - returns raw Response. */
+  Response changeTermEndRaw(String subscriptionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/change_term_end_estimate",
+            "subscription-id",
+            subscriptionId);
+
+    return post(path, null);
+  }
+
+  /**
+   * changeTermEnd a estimate using immutable params (executes immediately) - returns raw Response.
+   */
+  Response changeTermEndRaw(String subscriptionId, EstimateChangeTermEndParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/change_term_end_estimate",
+            "subscription-id",
+            subscriptionId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * changeTermEnd a estimate using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response changeTermEndRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/change_term_end_estimate",
+            "subscription-id",
+            subscriptionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public EstimateChangeTermEndResponse changeTermEnd(
+      String subscriptionId, EstimateChangeTermEndParams params) throws ChargebeeException {
+    Response response = changeTermEndRaw(subscriptionId, params);
+    return EstimateChangeTermEndResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** pauseSubscription a estimate (executes immediately) - returns raw Response. */
+  Response pauseSubscriptionRaw(String subscriptionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/pause_subscription_estimate",
+            "subscription-id",
+            subscriptionId);
+
+    return post(path, null);
+  }
+
+  /**
+   * pauseSubscription a estimate using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response pauseSubscriptionRaw(String subscriptionId, EstimatePauseSubscriptionParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/pause_subscription_estimate",
+            "subscription-id",
+            subscriptionId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * pauseSubscription a estimate using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response pauseSubscriptionRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/pause_subscription_estimate",
+            "subscription-id",
+            subscriptionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public EstimatePauseSubscriptionResponse pauseSubscription(
+      String subscriptionId, EstimatePauseSubscriptionParams params) throws ChargebeeException {
+    Response response = pauseSubscriptionRaw(subscriptionId, params);
+    return EstimatePauseSubscriptionResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** advanceInvoiceEstimate a estimate (executes immediately) - returns raw Response. */
+  Response advanceInvoiceEstimateRaw(String subscriptionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/advance_invoice_estimate",
+            "subscription-id",
+            subscriptionId);
+
+    return post(path, null);
+  }
+
+  /**
+   * advanceInvoiceEstimate a estimate using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response advanceInvoiceEstimateRaw(String subscriptionId, AdvanceInvoiceEstimateParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/advance_invoice_estimate",
+            "subscription-id",
+            subscriptionId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * advanceInvoiceEstimate a estimate using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response advanceInvoiceEstimateRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/advance_invoice_estimate",
+            "subscription-id",
+            subscriptionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public AdvanceInvoiceEstimateResponse advanceInvoiceEstimate(
+      String subscriptionId, AdvanceInvoiceEstimateParams params) throws ChargebeeException {
+    Response response = advanceInvoiceEstimateRaw(subscriptionId, params);
+    return AdvanceInvoiceEstimateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * updateSubscription a estimate using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response updateSubscriptionRaw(EstimateUpdateSubscriptionParams params)
+      throws ChargebeeException {
+
+    return post("/estimates/update_subscription", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * updateSubscription a estimate using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response updateSubscriptionRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/estimates/update_subscription", jsonPayload);
+  }
+
+  public EstimateUpdateSubscriptionResponse updateSubscription(
+      EstimateUpdateSubscriptionParams params) throws ChargebeeException {
+    Response response = updateSubscriptionRaw(params);
+
+    return EstimateUpdateSubscriptionResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * giftSubscription a estimate using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response giftSubscriptionRaw(EstimateGiftSubscriptionParams params) throws ChargebeeException {
+
+    return post("/estimates/gift_subscription", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * giftSubscription a estimate using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response giftSubscriptionRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/estimates/gift_subscription", jsonPayload);
+  }
+
+  public EstimateGiftSubscriptionResponse giftSubscription(EstimateGiftSubscriptionParams params)
+      throws ChargebeeException {
+    Response response = giftSubscriptionRaw(params);
+
+    return EstimateGiftSubscriptionResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createSubscriptionForCustomerEstimate a estimate (executes immediately) - returns raw Response.
+   */
+  Response createSubscriptionForCustomerEstimateRaw(String customerId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/customers/{customer-id}/create_subscription_estimate", "customer-id", customerId);
+
+    return get(path, null);
+  }
+
+  /**
+   * createSubscriptionForCustomerEstimate a estimate using immutable params (executes immediately)
+   * - returns raw Response.
+   */
+  Response createSubscriptionForCustomerEstimateRaw(
+      String customerId, CreateSubscriptionForCustomerEstimateParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/customers/{customer-id}/create_subscription_estimate", "customer-id", customerId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  public CreateSubscriptionForCustomerEstimateResponse createSubscriptionForCustomerEstimate(
+      String customerId, CreateSubscriptionForCustomerEstimateParams params)
+      throws ChargebeeException {
+    Response response = createSubscriptionForCustomerEstimateRaw(customerId, params);
+    return CreateSubscriptionForCustomerEstimateResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  public CreateSubscriptionForCustomerEstimateResponse createSubscriptionForCustomerEstimate(
+      String customerId) throws ChargebeeException {
+    Response response = createSubscriptionForCustomerEstimateRaw(customerId);
+    return CreateSubscriptionForCustomerEstimateResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /**
+   * createSubscription a estimate using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response createSubscriptionRaw(EstimateCreateSubscriptionParams params)
+      throws ChargebeeException {
+
+    return post("/estimates/create_subscription", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createSubscription a estimate using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response createSubscriptionRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/estimates/create_subscription", jsonPayload);
+  }
+
+  public EstimateCreateSubscriptionResponse createSubscription(
+      EstimateCreateSubscriptionParams params) throws ChargebeeException {
+    Response response = createSubscriptionRaw(params);
+
+    return EstimateCreateSubscriptionResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createInvoice a estimate using immutable params (executes immediately) - returns raw Response.
+   */
+  Response createInvoiceRaw(EstimateCreateInvoiceParams params) throws ChargebeeException {
+
+    return post("/estimates/create_invoice", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createInvoice a estimate using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response createInvoiceRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/estimates/create_invoice", jsonPayload);
+  }
+
+  public EstimateCreateInvoiceResponse createInvoice(EstimateCreateInvoiceParams params)
+      throws ChargebeeException {
+    Response response = createInvoiceRaw(params);
+
+    return EstimateCreateInvoiceResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** cancelSubscription a estimate (executes immediately) - returns raw Response. */
+  Response cancelSubscriptionRaw(String subscriptionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/cancel_subscription_estimate",
+            "subscription-id",
+            subscriptionId);
+
+    return post(path, null);
+  }
+
+  /**
+   * cancelSubscription a estimate using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response cancelSubscriptionRaw(String subscriptionId, EstimateCancelSubscriptionParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/cancel_subscription_estimate",
+            "subscription-id",
+            subscriptionId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * cancelSubscription a estimate using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response cancelSubscriptionRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/cancel_subscription_estimate",
+            "subscription-id",
+            subscriptionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public EstimateCancelSubscriptionResponse cancelSubscription(
+      String subscriptionId, EstimateCancelSubscriptionParams params) throws ChargebeeException {
+    Response response = cancelSubscriptionRaw(subscriptionId, params);
+    return EstimateCancelSubscriptionResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/EventService.java b/src/main/java/com/chargebee/v4/services/EventService.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/services/EventService.java
rename to src/main/java/com/chargebee/v4/services/EventService.java
index c3739100..e8617dcc 100644
--- a/src/main/java/com/chargebee/v4/core/services/EventService.java
+++ b/src/main/java/com/chargebee/v4/services/EventService.java
@@ -5,17 +5,18 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.event.params.EventListParams;
+import com.chargebee.v4.models.event.params.EventListParams;
 
-import com.chargebee.v4.core.responses.event.EventListResponse;
+import com.chargebee.v4.models.event.responses.EventListResponse;
 
-import com.chargebee.v4.core.responses.event.EventRetrieveResponse;
+import com.chargebee.v4.models.event.responses.EventRetrieveResponse;
 
 public final class EventService extends BaseService<EventService> {
 
@@ -52,42 +53,42 @@ public EventService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** list a event using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(EventListParams params) throws Exception {
+  Response listRaw(EventListParams params) throws ChargebeeException {
 
     return get("/events", params != null ? params.toQueryParams() : null);
   }
 
   /** list a event without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/events", null);
   }
 
   /** list a event using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public EventListResponse list(EventListParams params) throws Exception {
+  public EventListResponse list(EventListParams params) throws ChargebeeException {
     Response response = listRaw(params);
 
     return EventListResponse.fromJson(response.getBodyAsString(), this, params, response);
   }
 
-  public EventListResponse list() throws Exception {
+  public EventListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return EventListResponse.fromJson(response.getBodyAsString(), this, null, response);
   }
 
   /** retrieve a event (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String eventId) throws Exception {
+  Response retrieveRaw(String eventId) throws ChargebeeException {
     String path = buildPathWithParams("/events/{event-id}", "event-id", eventId);
 
     return get(path, null);
   }
 
-  public EventRetrieveResponse retrieve(String eventId) throws Exception {
+  public EventRetrieveResponse retrieve(String eventId) throws ChargebeeException {
     Response response = retrieveRaw(eventId);
     return EventRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/services/ExportService.java b/src/main/java/com/chargebee/v4/services/ExportService.java
new file mode 100644
index 00000000..0d981839
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/ExportService.java
@@ -0,0 +1,474 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.export.params.ExportCustomersParams;
+
+import com.chargebee.v4.models.export.params.ExportAttachedItemsParams;
+
+import com.chargebee.v4.models.export.params.ExportTransactionsParams;
+
+import com.chargebee.v4.models.export.params.ExportDifferentialPricesParams;
+
+import com.chargebee.v4.models.export.params.ExportItemFamiliesParams;
+
+import com.chargebee.v4.models.export.params.ExportInvoicesParams;
+
+import com.chargebee.v4.models.export.params.ExportPriceVariantsParams;
+
+import com.chargebee.v4.models.export.params.ExportItemsParams;
+
+import com.chargebee.v4.models.export.params.ExportDeferredRevenueParams;
+
+import com.chargebee.v4.models.export.params.ExportRevenueRecognitionParams;
+
+import com.chargebee.v4.models.export.params.ExportCreditNotesParams;
+
+import com.chargebee.v4.models.export.params.ExportCouponsParams;
+
+import com.chargebee.v4.models.export.params.ExportOrdersParams;
+
+import com.chargebee.v4.models.export.params.ExportItemPricesParams;
+
+import com.chargebee.v4.models.export.params.ExportSubscriptionsParams;
+
+import com.chargebee.v4.models.export.params.ExportAddonsParams;
+
+import com.chargebee.v4.models.export.params.ExportPlansParams;
+
+import com.chargebee.v4.models.export.responses.ExportCustomersResponse;
+
+import com.chargebee.v4.models.export.responses.ExportAttachedItemsResponse;
+
+import com.chargebee.v4.models.export.responses.ExportTransactionsResponse;
+
+import com.chargebee.v4.models.export.responses.ExportDifferentialPricesResponse;
+
+import com.chargebee.v4.models.export.responses.ExportItemFamiliesResponse;
+
+import com.chargebee.v4.models.export.responses.ExportInvoicesResponse;
+
+import com.chargebee.v4.models.export.responses.ExportRetrieveResponse;
+
+import com.chargebee.v4.models.export.responses.ExportPriceVariantsResponse;
+
+import com.chargebee.v4.models.export.responses.ExportItemsResponse;
+
+import com.chargebee.v4.models.export.responses.ExportDeferredRevenueResponse;
+
+import com.chargebee.v4.models.export.responses.ExportRevenueRecognitionResponse;
+
+import com.chargebee.v4.models.export.responses.ExportCreditNotesResponse;
+
+import com.chargebee.v4.models.export.responses.ExportCouponsResponse;
+
+import com.chargebee.v4.models.export.responses.ExportOrdersResponse;
+
+import com.chargebee.v4.models.export.responses.ExportItemPricesResponse;
+
+import com.chargebee.v4.models.export.responses.ExportSubscriptionsResponse;
+
+import com.chargebee.v4.models.export.responses.ExportAddonsResponse;
+
+import com.chargebee.v4.models.export.responses.ExportPlansResponse;
+
+public final class ExportService extends BaseService<ExportService> {
+
+  private final ServiceConfig config;
+
+  public ExportService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private ExportService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private ExportService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  ExportService with(RequestOptions newOptions) {
+    return new ExportService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public ExportService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** customers a export using immutable params (executes immediately) - returns raw Response. */
+  Response customersRaw(ExportCustomersParams params) throws ChargebeeException {
+
+    return post("/exports/customers", params != null ? params.toFormData() : null);
+  }
+
+  /** customers a export using raw JSON payload (executes immediately) - returns raw Response. */
+  Response customersRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/customers", jsonPayload);
+  }
+
+  public ExportCustomersResponse customers(ExportCustomersParams params) throws ChargebeeException {
+    Response response = customersRaw(params);
+
+    return ExportCustomersResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * attachedItems a export using immutable params (executes immediately) - returns raw Response.
+   */
+  Response attachedItemsRaw(ExportAttachedItemsParams params) throws ChargebeeException {
+
+    return post("/exports/attached_items", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * attachedItems a export using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response attachedItemsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/attached_items", jsonPayload);
+  }
+
+  public ExportAttachedItemsResponse attachedItems(ExportAttachedItemsParams params)
+      throws ChargebeeException {
+    Response response = attachedItemsRaw(params);
+
+    return ExportAttachedItemsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** transactions a export using immutable params (executes immediately) - returns raw Response. */
+  Response transactionsRaw(ExportTransactionsParams params) throws ChargebeeException {
+
+    return post("/exports/transactions", params != null ? params.toFormData() : null);
+  }
+
+  /** transactions a export using raw JSON payload (executes immediately) - returns raw Response. */
+  Response transactionsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/transactions", jsonPayload);
+  }
+
+  public ExportTransactionsResponse transactions(ExportTransactionsParams params)
+      throws ChargebeeException {
+    Response response = transactionsRaw(params);
+
+    return ExportTransactionsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * differentialPrices a export using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response differentialPricesRaw(ExportDifferentialPricesParams params) throws ChargebeeException {
+
+    return post("/exports/differential_prices", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * differentialPrices a export using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response differentialPricesRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/differential_prices", jsonPayload);
+  }
+
+  public ExportDifferentialPricesResponse differentialPrices(ExportDifferentialPricesParams params)
+      throws ChargebeeException {
+    Response response = differentialPricesRaw(params);
+
+    return ExportDifferentialPricesResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** itemFamilies a export using immutable params (executes immediately) - returns raw Response. */
+  Response itemFamiliesRaw(ExportItemFamiliesParams params) throws ChargebeeException {
+
+    return post("/exports/item_families", params != null ? params.toFormData() : null);
+  }
+
+  /** itemFamilies a export using raw JSON payload (executes immediately) - returns raw Response. */
+  Response itemFamiliesRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/item_families", jsonPayload);
+  }
+
+  public ExportItemFamiliesResponse itemFamilies(ExportItemFamiliesParams params)
+      throws ChargebeeException {
+    Response response = itemFamiliesRaw(params);
+
+    return ExportItemFamiliesResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** invoices a export using immutable params (executes immediately) - returns raw Response. */
+  Response invoicesRaw(ExportInvoicesParams params) throws ChargebeeException {
+
+    return post("/exports/invoices", params != null ? params.toFormData() : null);
+  }
+
+  /** invoices a export using raw JSON payload (executes immediately) - returns raw Response. */
+  Response invoicesRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/invoices", jsonPayload);
+  }
+
+  public ExportInvoicesResponse invoices(ExportInvoicesParams params) throws ChargebeeException {
+    Response response = invoicesRaw(params);
+
+    return ExportInvoicesResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a export (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String exportId) throws ChargebeeException {
+    String path = buildPathWithParams("/exports/{export-id}", "export-id", exportId);
+
+    return get(path, null);
+  }
+
+  public ExportRetrieveResponse retrieve(String exportId) throws ChargebeeException {
+    Response response = retrieveRaw(exportId);
+    return ExportRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * priceVariants a export using immutable params (executes immediately) - returns raw Response.
+   */
+  Response priceVariantsRaw(ExportPriceVariantsParams params) throws ChargebeeException {
+
+    return post("/exports/price_variants", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * priceVariants a export using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response priceVariantsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/price_variants", jsonPayload);
+  }
+
+  public ExportPriceVariantsResponse priceVariants(ExportPriceVariantsParams params)
+      throws ChargebeeException {
+    Response response = priceVariantsRaw(params);
+
+    return ExportPriceVariantsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** items a export using immutable params (executes immediately) - returns raw Response. */
+  Response itemsRaw(ExportItemsParams params) throws ChargebeeException {
+
+    return post("/exports/items", params != null ? params.toFormData() : null);
+  }
+
+  /** items a export using raw JSON payload (executes immediately) - returns raw Response. */
+  Response itemsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/items", jsonPayload);
+  }
+
+  public ExportItemsResponse items(ExportItemsParams params) throws ChargebeeException {
+    Response response = itemsRaw(params);
+
+    return ExportItemsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * deferredRevenue a export using immutable params (executes immediately) - returns raw Response.
+   */
+  Response deferredRevenueRaw(ExportDeferredRevenueParams params) throws ChargebeeException {
+
+    return post("/exports/deferred_revenue", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * deferredRevenue a export using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response deferredRevenueRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/deferred_revenue", jsonPayload);
+  }
+
+  public ExportDeferredRevenueResponse deferredRevenue(ExportDeferredRevenueParams params)
+      throws ChargebeeException {
+    Response response = deferredRevenueRaw(params);
+
+    return ExportDeferredRevenueResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * revenueRecognition a export using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response revenueRecognitionRaw(ExportRevenueRecognitionParams params) throws ChargebeeException {
+
+    return post("/exports/revenue_recognition", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * revenueRecognition a export using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response revenueRecognitionRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/revenue_recognition", jsonPayload);
+  }
+
+  public ExportRevenueRecognitionResponse revenueRecognition(ExportRevenueRecognitionParams params)
+      throws ChargebeeException {
+    Response response = revenueRecognitionRaw(params);
+
+    return ExportRevenueRecognitionResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** creditNotes a export using immutable params (executes immediately) - returns raw Response. */
+  Response creditNotesRaw(ExportCreditNotesParams params) throws ChargebeeException {
+
+    return post("/exports/credit_notes", params != null ? params.toFormData() : null);
+  }
+
+  /** creditNotes a export using raw JSON payload (executes immediately) - returns raw Response. */
+  Response creditNotesRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/credit_notes", jsonPayload);
+  }
+
+  public ExportCreditNotesResponse creditNotes(ExportCreditNotesParams params)
+      throws ChargebeeException {
+    Response response = creditNotesRaw(params);
+
+    return ExportCreditNotesResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** coupons a export using immutable params (executes immediately) - returns raw Response. */
+  Response couponsRaw(ExportCouponsParams params) throws ChargebeeException {
+
+    return post("/exports/coupons", params != null ? params.toFormData() : null);
+  }
+
+  /** coupons a export using raw JSON payload (executes immediately) - returns raw Response. */
+  Response couponsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/coupons", jsonPayload);
+  }
+
+  public ExportCouponsResponse coupons(ExportCouponsParams params) throws ChargebeeException {
+    Response response = couponsRaw(params);
+
+    return ExportCouponsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** orders a export using immutable params (executes immediately) - returns raw Response. */
+  Response ordersRaw(ExportOrdersParams params) throws ChargebeeException {
+
+    return post("/exports/orders", params != null ? params.toFormData() : null);
+  }
+
+  /** orders a export using raw JSON payload (executes immediately) - returns raw Response. */
+  Response ordersRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/orders", jsonPayload);
+  }
+
+  public ExportOrdersResponse orders(ExportOrdersParams params) throws ChargebeeException {
+    Response response = ordersRaw(params);
+
+    return ExportOrdersResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** itemPrices a export using immutable params (executes immediately) - returns raw Response. */
+  Response itemPricesRaw(ExportItemPricesParams params) throws ChargebeeException {
+
+    return post("/exports/item_prices", params != null ? params.toFormData() : null);
+  }
+
+  /** itemPrices a export using raw JSON payload (executes immediately) - returns raw Response. */
+  Response itemPricesRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/item_prices", jsonPayload);
+  }
+
+  public ExportItemPricesResponse itemPrices(ExportItemPricesParams params)
+      throws ChargebeeException {
+    Response response = itemPricesRaw(params);
+
+    return ExportItemPricesResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * subscriptions a export using immutable params (executes immediately) - returns raw Response.
+   */
+  Response subscriptionsRaw(ExportSubscriptionsParams params) throws ChargebeeException {
+
+    return post("/exports/subscriptions", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * subscriptions a export using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response subscriptionsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/subscriptions", jsonPayload);
+  }
+
+  public ExportSubscriptionsResponse subscriptions(ExportSubscriptionsParams params)
+      throws ChargebeeException {
+    Response response = subscriptionsRaw(params);
+
+    return ExportSubscriptionsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** addons a export using immutable params (executes immediately) - returns raw Response. */
+  Response addonsRaw(ExportAddonsParams params) throws ChargebeeException {
+
+    return post("/exports/addons", params != null ? params.toFormData() : null);
+  }
+
+  /** addons a export using raw JSON payload (executes immediately) - returns raw Response. */
+  Response addonsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/addons", jsonPayload);
+  }
+
+  public ExportAddonsResponse addons(ExportAddonsParams params) throws ChargebeeException {
+    Response response = addonsRaw(params);
+
+    return ExportAddonsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** plans a export using immutable params (executes immediately) - returns raw Response. */
+  Response plansRaw(ExportPlansParams params) throws ChargebeeException {
+
+    return post("/exports/plans", params != null ? params.toFormData() : null);
+  }
+
+  /** plans a export using raw JSON payload (executes immediately) - returns raw Response. */
+  Response plansRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/exports/plans", jsonPayload);
+  }
+
+  public ExportPlansResponse plans(ExportPlansParams params) throws ChargebeeException {
+    Response response = plansRaw(params);
+
+    return ExportPlansResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/FeatureService.java b/src/main/java/com/chargebee/v4/services/FeatureService.java
new file mode 100644
index 00000000..3f3856f4
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/FeatureService.java
@@ -0,0 +1,205 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.feature.params.FeatureListParams;
+
+import com.chargebee.v4.models.feature.params.FeatureCreateParams;
+
+import com.chargebee.v4.models.feature.params.FeatureUpdateParams;
+
+import com.chargebee.v4.models.feature.responses.FeatureListResponse;
+
+import com.chargebee.v4.models.feature.responses.FeatureCreateResponse;
+
+import com.chargebee.v4.models.feature.responses.FeatureDeleteResponse;
+
+import com.chargebee.v4.models.feature.responses.FeatureRetrieveResponse;
+
+import com.chargebee.v4.models.feature.responses.FeatureUpdateResponse;
+
+import com.chargebee.v4.models.feature.responses.FeatureArchiveResponse;
+
+import com.chargebee.v4.models.feature.responses.FeatureActivateResponse;
+
+import com.chargebee.v4.models.feature.responses.FeatureReactivateResponse;
+
+public final class FeatureService extends BaseService<FeatureService> {
+
+  private final ServiceConfig config;
+
+  public FeatureService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private FeatureService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private FeatureService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  FeatureService with(RequestOptions newOptions) {
+    return new FeatureService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public FeatureService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** list a feature using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(FeatureListParams params) throws ChargebeeException {
+
+    return get("/features", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a feature without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/features", null);
+  }
+
+  /** list a feature using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public FeatureListResponse list(FeatureListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return FeatureListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public FeatureListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return FeatureListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** create a feature using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(FeatureCreateParams params) throws ChargebeeException {
+
+    return post("/features", params != null ? params.toFormData() : null);
+  }
+
+  /** create a feature using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/features", jsonPayload);
+  }
+
+  public FeatureCreateResponse create(FeatureCreateParams params) throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return FeatureCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** delete a feature (executes immediately) - returns raw Response. */
+  Response deleteRaw(String featureId) throws ChargebeeException {
+    String path = buildPathWithParams("/features/{feature-id}/delete", "feature-id", featureId);
+
+    return post(path, null);
+  }
+
+  public FeatureDeleteResponse delete(String featureId) throws ChargebeeException {
+    Response response = deleteRaw(featureId);
+    return FeatureDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a feature (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String featureId) throws ChargebeeException {
+    String path = buildPathWithParams("/features/{feature-id}", "feature-id", featureId);
+
+    return get(path, null);
+  }
+
+  public FeatureRetrieveResponse retrieve(String featureId) throws ChargebeeException {
+    Response response = retrieveRaw(featureId);
+    return FeatureRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** update a feature (executes immediately) - returns raw Response. */
+  Response updateRaw(String featureId) throws ChargebeeException {
+    String path = buildPathWithParams("/features/{feature-id}", "feature-id", featureId);
+
+    return post(path, null);
+  }
+
+  /** update a feature using immutable params (executes immediately) - returns raw Response. */
+  Response updateRaw(String featureId, FeatureUpdateParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/features/{feature-id}", "feature-id", featureId);
+    return post(path, params.toFormData());
+  }
+
+  /** update a feature using raw JSON payload (executes immediately) - returns raw Response. */
+  Response updateRaw(String featureId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/features/{feature-id}", "feature-id", featureId);
+    return postJson(path, jsonPayload);
+  }
+
+  public FeatureUpdateResponse update(String featureId, FeatureUpdateParams params)
+      throws ChargebeeException {
+    Response response = updateRaw(featureId, params);
+    return FeatureUpdateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** archive a feature (executes immediately) - returns raw Response. */
+  Response archiveRaw(String featureId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/features/{feature-id}/archive_command", "feature-id", featureId);
+
+    return post(path, null);
+  }
+
+  public FeatureArchiveResponse archive(String featureId) throws ChargebeeException {
+    Response response = archiveRaw(featureId);
+    return FeatureArchiveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** activate a feature (executes immediately) - returns raw Response. */
+  Response activateRaw(String featureId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/features/{feature-id}/activate_command", "feature-id", featureId);
+
+    return post(path, null);
+  }
+
+  public FeatureActivateResponse activate(String featureId) throws ChargebeeException {
+    Response response = activateRaw(featureId);
+    return FeatureActivateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** reactivate a feature (executes immediately) - returns raw Response. */
+  Response reactivateRaw(String featureId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/features/{feature-id}/reactivate_command", "feature-id", featureId);
+
+    return post(path, null);
+  }
+
+  public FeatureReactivateResponse reactivate(String featureId) throws ChargebeeException {
+    Response response = reactivateRaw(featureId);
+    return FeatureReactivateResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/FullExportService.java b/src/main/java/com/chargebee/v4/services/FullExportService.java
similarity index 81%
rename from src/main/java/com/chargebee/v4/core/services/FullExportService.java
rename to src/main/java/com/chargebee/v4/services/FullExportService.java
index 7ae91ba0..9ec7159f 100644
--- a/src/main/java/com/chargebee/v4/core/services/FullExportService.java
+++ b/src/main/java/com/chargebee/v4/services/FullExportService.java
@@ -5,15 +5,16 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.fullExport.params.FullExportStatusParams;
+import com.chargebee.v4.models.fullExport.params.FullExportStatusParams;
 
-import com.chargebee.v4.core.responses.fullExport.FullExportStatusResponse;
+import com.chargebee.v4.models.fullExport.responses.FullExportStatusResponse;
 
 public final class FullExportService extends BaseService<FullExportService> {
 
@@ -50,18 +51,18 @@ public FullExportService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** status a fullExport using immutable params (executes immediately) - returns raw Response. */
-  Response statusRaw(FullExportStatusParams params) throws Exception {
+  Response statusRaw(FullExportStatusParams params) throws ChargebeeException {
 
     return get("/full_exports/status", params != null ? params.toQueryParams() : null);
   }
 
   /** status a fullExport using raw JSON payload (executes immediately) - returns raw Response. */
-  Response statusRaw(String jsonPayload) throws Exception {
+  Response statusRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public FullExportStatusResponse status(FullExportStatusParams params) throws Exception {
+  public FullExportStatusResponse status(FullExportStatusParams params) throws ChargebeeException {
     Response response = statusRaw(params);
 
     return FullExportStatusResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/services/GiftService.java b/src/main/java/com/chargebee/v4/services/GiftService.java
new file mode 100644
index 00000000..17fec704
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/GiftService.java
@@ -0,0 +1,197 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.gift.params.GiftCreateForItemsParams;
+
+import com.chargebee.v4.models.gift.params.UpdateGiftParams;
+
+import com.chargebee.v4.models.gift.params.GiftListParams;
+
+import com.chargebee.v4.models.gift.params.GiftCreateParams;
+
+import com.chargebee.v4.models.gift.responses.GiftCreateForItemsResponse;
+
+import com.chargebee.v4.models.gift.responses.GiftCancelResponse;
+
+import com.chargebee.v4.models.gift.responses.UpdateGiftResponse;
+
+import com.chargebee.v4.models.gift.responses.GiftListResponse;
+
+import com.chargebee.v4.models.gift.responses.GiftCreateResponse;
+
+import com.chargebee.v4.models.gift.responses.GiftRetrieveResponse;
+
+import com.chargebee.v4.models.gift.responses.GiftClaimResponse;
+
+public final class GiftService extends BaseService<GiftService> {
+
+  private final ServiceConfig config;
+
+  public GiftService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private GiftService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private GiftService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  GiftService with(RequestOptions newOptions) {
+    return new GiftService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public GiftService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** createForItems a gift using immutable params (executes immediately) - returns raw Response. */
+  Response createForItemsRaw(GiftCreateForItemsParams params) throws ChargebeeException {
+
+    return post("/gifts/create_for_items", params != null ? params.toFormData() : null);
+  }
+
+  /** createForItems a gift using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createForItemsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/gifts/create_for_items", jsonPayload);
+  }
+
+  public GiftCreateForItemsResponse createForItems(GiftCreateForItemsParams params)
+      throws ChargebeeException {
+    Response response = createForItemsRaw(params);
+
+    return GiftCreateForItemsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** cancel a gift (executes immediately) - returns raw Response. */
+  Response cancelRaw(String giftId) throws ChargebeeException {
+    String path = buildPathWithParams("/gifts/{gift-id}/cancel", "gift-id", giftId);
+
+    return post(path, null);
+  }
+
+  public GiftCancelResponse cancel(String giftId) throws ChargebeeException {
+    Response response = cancelRaw(giftId);
+    return GiftCancelResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** updateGift a gift (executes immediately) - returns raw Response. */
+  Response updateGiftRaw(String giftId) throws ChargebeeException {
+    String path = buildPathWithParams("/gifts/{gift-id}/update_gift", "gift-id", giftId);
+
+    return post(path, null);
+  }
+
+  /** updateGift a gift using immutable params (executes immediately) - returns raw Response. */
+  Response updateGiftRaw(String giftId, UpdateGiftParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/gifts/{gift-id}/update_gift", "gift-id", giftId);
+    return post(path, params.toFormData());
+  }
+
+  /** updateGift a gift using raw JSON payload (executes immediately) - returns raw Response. */
+  Response updateGiftRaw(String giftId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/gifts/{gift-id}/update_gift", "gift-id", giftId);
+    return postJson(path, jsonPayload);
+  }
+
+  public UpdateGiftResponse updateGift(String giftId, UpdateGiftParams params)
+      throws ChargebeeException {
+    Response response = updateGiftRaw(giftId, params);
+    return UpdateGiftResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** list a gift using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(GiftListParams params) throws ChargebeeException {
+
+    return get("/gifts", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a gift without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/gifts", null);
+  }
+
+  /** list a gift using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public GiftListResponse list(GiftListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return GiftListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public GiftListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return GiftListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** create a gift using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(GiftCreateParams params) throws ChargebeeException {
+
+    return post("/gifts", params != null ? params.toFormData() : null);
+  }
+
+  /** create a gift using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/gifts", jsonPayload);
+  }
+
+  public GiftCreateResponse create(GiftCreateParams params) throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return GiftCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a gift (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String giftId) throws ChargebeeException {
+    String path = buildPathWithParams("/gifts/{gift-id}", "gift-id", giftId);
+
+    return get(path, null);
+  }
+
+  public GiftRetrieveResponse retrieve(String giftId) throws ChargebeeException {
+    Response response = retrieveRaw(giftId);
+    return GiftRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** claim a gift (executes immediately) - returns raw Response. */
+  Response claimRaw(String giftId) throws ChargebeeException {
+    String path = buildPathWithParams("/gifts/{gift-id}/claim", "gift-id", giftId);
+
+    return post(path, null);
+  }
+
+  public GiftClaimResponse claim(String giftId) throws ChargebeeException {
+    Response response = claimRaw(giftId);
+    return GiftClaimResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/HostedPageService.java b/src/main/java/com/chargebee/v4/services/HostedPageService.java
new file mode 100644
index 00000000..dec4970c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/HostedPageService.java
@@ -0,0 +1,655 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageCheckoutOneTimeForItemsParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageUpdatePaymentMethodParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageUpdateCardParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageExtendSubscriptionParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageEventsParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageCheckoutGiftForItemsParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageListParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageViewVoucherParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageCollectNowParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageAcceptQuoteParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageCheckoutNewForItemsParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageClaimGiftParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageCheckoutExistingForItemsParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPagePreCancelParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageRetrieveAgreementPdfParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageManagePaymentSourcesParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageCheckoutOneTimeParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageCheckoutNewParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageCheckoutGiftParams;
+
+import com.chargebee.v4.models.hostedPage.params.HostedPageCheckoutExistingParams;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageCheckoutOneTimeForItemsResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageUpdatePaymentMethodResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageUpdateCardResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageExtendSubscriptionResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageEventsResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageCheckoutGiftForItemsResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageListResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageViewVoucherResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageCollectNowResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageAcceptQuoteResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageCheckoutNewForItemsResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageClaimGiftResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageCheckoutExistingForItemsResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPagePreCancelResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageAcknowledgeResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageRetrieveAgreementPdfResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageRetrieveResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageManagePaymentSourcesResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageCheckoutOneTimeResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageCheckoutNewResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageCheckoutGiftResponse;
+
+import com.chargebee.v4.models.hostedPage.responses.HostedPageCheckoutExistingResponse;
+
+public final class HostedPageService extends BaseService<HostedPageService> {
+
+  private final ServiceConfig config;
+
+  public HostedPageService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private HostedPageService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private HostedPageService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  HostedPageService with(RequestOptions newOptions) {
+    return new HostedPageService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public HostedPageService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * checkoutOneTimeForItems a hostedPage using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response checkoutOneTimeForItemsRaw(HostedPageCheckoutOneTimeForItemsParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/hosted_pages/checkout_one_time_for_items", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * checkoutOneTimeForItems a hostedPage using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response checkoutOneTimeForItemsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/checkout_one_time_for_items", jsonPayload);
+  }
+
+  public HostedPageCheckoutOneTimeForItemsResponse checkoutOneTimeForItems(
+      HostedPageCheckoutOneTimeForItemsParams params) throws ChargebeeException {
+    Response response = checkoutOneTimeForItemsRaw(params);
+
+    return HostedPageCheckoutOneTimeForItemsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * updatePaymentMethod a hostedPage using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response updatePaymentMethodRaw(HostedPageUpdatePaymentMethodParams params)
+      throws ChargebeeException {
+
+    return post("/hosted_pages/update_payment_method", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * updatePaymentMethod a hostedPage using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response updatePaymentMethodRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/update_payment_method", jsonPayload);
+  }
+
+  public HostedPageUpdatePaymentMethodResponse updatePaymentMethod(
+      HostedPageUpdatePaymentMethodParams params) throws ChargebeeException {
+    Response response = updatePaymentMethodRaw(params);
+
+    return HostedPageUpdatePaymentMethodResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * updateCard a hostedPage using immutable params (executes immediately) - returns raw Response.
+   */
+  Response updateCardRaw(HostedPageUpdateCardParams params) throws ChargebeeException {
+
+    return post("/hosted_pages/update_card", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * updateCard a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response updateCardRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/update_card", jsonPayload);
+  }
+
+  public HostedPageUpdateCardResponse updateCard(HostedPageUpdateCardParams params)
+      throws ChargebeeException {
+    Response response = updateCardRaw(params);
+
+    return HostedPageUpdateCardResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * extendSubscription a hostedPage using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response extendSubscriptionRaw(HostedPageExtendSubscriptionParams params)
+      throws ChargebeeException {
+
+    return post("/hosted_pages/extend_subscription", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * extendSubscription a hostedPage using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response extendSubscriptionRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/extend_subscription", jsonPayload);
+  }
+
+  public HostedPageExtendSubscriptionResponse extendSubscription(
+      HostedPageExtendSubscriptionParams params) throws ChargebeeException {
+    Response response = extendSubscriptionRaw(params);
+
+    return HostedPageExtendSubscriptionResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** events a hostedPage using immutable params (executes immediately) - returns raw Response. */
+  Response eventsRaw(HostedPageEventsParams params) throws ChargebeeException {
+
+    return post("/hosted_pages/events", params != null ? params.toFormData() : null);
+  }
+
+  /** events a hostedPage using raw JSON payload (executes immediately) - returns raw Response. */
+  Response eventsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/events", jsonPayload);
+  }
+
+  public HostedPageEventsResponse events(HostedPageEventsParams params) throws ChargebeeException {
+    Response response = eventsRaw(params);
+
+    return HostedPageEventsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * checkoutGiftForItems a hostedPage using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response checkoutGiftForItemsRaw(HostedPageCheckoutGiftForItemsParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/hosted_pages/checkout_gift_for_items", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * checkoutGiftForItems a hostedPage using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response checkoutGiftForItemsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/checkout_gift_for_items", jsonPayload);
+  }
+
+  public HostedPageCheckoutGiftForItemsResponse checkoutGiftForItems(
+      HostedPageCheckoutGiftForItemsParams params) throws ChargebeeException {
+    Response response = checkoutGiftForItemsRaw(params);
+
+    return HostedPageCheckoutGiftForItemsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** list a hostedPage using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(HostedPageListParams params) throws ChargebeeException {
+
+    return get("/hosted_pages", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a hostedPage without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/hosted_pages", null);
+  }
+
+  /** list a hostedPage using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public HostedPageListResponse list(HostedPageListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return HostedPageListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public HostedPageListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return HostedPageListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /**
+   * viewVoucher a hostedPage using immutable params (executes immediately) - returns raw Response.
+   */
+  Response viewVoucherRaw(HostedPageViewVoucherParams params) throws ChargebeeException {
+
+    return post("/hosted_pages/view_voucher", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * viewVoucher a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response viewVoucherRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/view_voucher", jsonPayload);
+  }
+
+  public HostedPageViewVoucherResponse viewVoucher(HostedPageViewVoucherParams params)
+      throws ChargebeeException {
+    Response response = viewVoucherRaw(params);
+
+    return HostedPageViewVoucherResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * collectNow a hostedPage using immutable params (executes immediately) - returns raw Response.
+   */
+  Response collectNowRaw(HostedPageCollectNowParams params) throws ChargebeeException {
+
+    return post("/hosted_pages/collect_now", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * collectNow a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response collectNowRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/collect_now", jsonPayload);
+  }
+
+  public HostedPageCollectNowResponse collectNow(HostedPageCollectNowParams params)
+      throws ChargebeeException {
+    Response response = collectNowRaw(params);
+
+    return HostedPageCollectNowResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * acceptQuote a hostedPage using immutable params (executes immediately) - returns raw Response.
+   */
+  Response acceptQuoteRaw(HostedPageAcceptQuoteParams params) throws ChargebeeException {
+
+    return post("/hosted_pages/accept_quote", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * acceptQuote a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response acceptQuoteRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/accept_quote", jsonPayload);
+  }
+
+  public HostedPageAcceptQuoteResponse acceptQuote(HostedPageAcceptQuoteParams params)
+      throws ChargebeeException {
+    Response response = acceptQuoteRaw(params);
+
+    return HostedPageAcceptQuoteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * checkoutNewForItems a hostedPage using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response checkoutNewForItemsRaw(HostedPageCheckoutNewForItemsParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/hosted_pages/checkout_new_for_items", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * checkoutNewForItems a hostedPage using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response checkoutNewForItemsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/checkout_new_for_items", jsonPayload);
+  }
+
+  public HostedPageCheckoutNewForItemsResponse checkoutNewForItems(
+      HostedPageCheckoutNewForItemsParams params) throws ChargebeeException {
+    Response response = checkoutNewForItemsRaw(params);
+
+    return HostedPageCheckoutNewForItemsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * claimGift a hostedPage using immutable params (executes immediately) - returns raw Response.
+   */
+  Response claimGiftRaw(HostedPageClaimGiftParams params) throws ChargebeeException {
+
+    return post("/hosted_pages/claim_gift", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * claimGift a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response claimGiftRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/claim_gift", jsonPayload);
+  }
+
+  public HostedPageClaimGiftResponse claimGift(HostedPageClaimGiftParams params)
+      throws ChargebeeException {
+    Response response = claimGiftRaw(params);
+
+    return HostedPageClaimGiftResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * checkoutExistingForItems a hostedPage using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response checkoutExistingForItemsRaw(HostedPageCheckoutExistingForItemsParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/hosted_pages/checkout_existing_for_items", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * checkoutExistingForItems a hostedPage using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response checkoutExistingForItemsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/checkout_existing_for_items", jsonPayload);
+  }
+
+  public HostedPageCheckoutExistingForItemsResponse checkoutExistingForItems(
+      HostedPageCheckoutExistingForItemsParams params) throws ChargebeeException {
+    Response response = checkoutExistingForItemsRaw(params);
+
+    return HostedPageCheckoutExistingForItemsResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /**
+   * preCancel a hostedPage using immutable params (executes immediately) - returns raw Response.
+   */
+  Response preCancelRaw(HostedPagePreCancelParams params) throws ChargebeeException {
+
+    return post("/hosted_pages/pre_cancel", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * preCancel a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response preCancelRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/pre_cancel", jsonPayload);
+  }
+
+  public HostedPagePreCancelResponse preCancel(HostedPagePreCancelParams params)
+      throws ChargebeeException {
+    Response response = preCancelRaw(params);
+
+    return HostedPagePreCancelResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** acknowledge a hostedPage (executes immediately) - returns raw Response. */
+  Response acknowledgeRaw(String hostedPageId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/hosted_pages/{hosted-page-id}/acknowledge", "hosted-page-id", hostedPageId);
+
+    return post(path, null);
+  }
+
+  public HostedPageAcknowledgeResponse acknowledge(String hostedPageId) throws ChargebeeException {
+    Response response = acknowledgeRaw(hostedPageId);
+    return HostedPageAcknowledgeResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * retrieveAgreementPdf a hostedPage using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response retrieveAgreementPdfRaw(HostedPageRetrieveAgreementPdfParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/hosted_pages/retrieve_agreement_pdf", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * retrieveAgreementPdf a hostedPage using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response retrieveAgreementPdfRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/retrieve_agreement_pdf", jsonPayload);
+  }
+
+  public HostedPageRetrieveAgreementPdfResponse retrieveAgreementPdf(
+      HostedPageRetrieveAgreementPdfParams params) throws ChargebeeException {
+    Response response = retrieveAgreementPdfRaw(params);
+
+    return HostedPageRetrieveAgreementPdfResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a hostedPage (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String hostedPageId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/hosted_pages/{hosted-page-id}", "hosted-page-id", hostedPageId);
+
+    return get(path, null);
+  }
+
+  public HostedPageRetrieveResponse retrieve(String hostedPageId) throws ChargebeeException {
+    Response response = retrieveRaw(hostedPageId);
+    return HostedPageRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * managePaymentSources a hostedPage using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response managePaymentSourcesRaw(HostedPageManagePaymentSourcesParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/hosted_pages/manage_payment_sources", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * managePaymentSources a hostedPage using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response managePaymentSourcesRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/manage_payment_sources", jsonPayload);
+  }
+
+  public HostedPageManagePaymentSourcesResponse managePaymentSources(
+      HostedPageManagePaymentSourcesParams params) throws ChargebeeException {
+    Response response = managePaymentSourcesRaw(params);
+
+    return HostedPageManagePaymentSourcesResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * checkoutOneTime a hostedPage using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response checkoutOneTimeRaw(HostedPageCheckoutOneTimeParams params) throws ChargebeeException {
+
+    return post("/hosted_pages/checkout_one_time", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * checkoutOneTime a hostedPage using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response checkoutOneTimeRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/checkout_one_time", jsonPayload);
+  }
+
+  public HostedPageCheckoutOneTimeResponse checkoutOneTime(HostedPageCheckoutOneTimeParams params)
+      throws ChargebeeException {
+    Response response = checkoutOneTimeRaw(params);
+
+    return HostedPageCheckoutOneTimeResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * checkoutNew a hostedPage using immutable params (executes immediately) - returns raw Response.
+   */
+  Response checkoutNewRaw(HostedPageCheckoutNewParams params) throws ChargebeeException {
+
+    return post("/hosted_pages/checkout_new", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * checkoutNew a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response checkoutNewRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/checkout_new", jsonPayload);
+  }
+
+  public HostedPageCheckoutNewResponse checkoutNew(HostedPageCheckoutNewParams params)
+      throws ChargebeeException {
+    Response response = checkoutNewRaw(params);
+
+    return HostedPageCheckoutNewResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * checkoutGift a hostedPage using immutable params (executes immediately) - returns raw Response.
+   */
+  Response checkoutGiftRaw(HostedPageCheckoutGiftParams params) throws ChargebeeException {
+
+    return post("/hosted_pages/checkout_gift", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * checkoutGift a hostedPage using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response checkoutGiftRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/checkout_gift", jsonPayload);
+  }
+
+  public HostedPageCheckoutGiftResponse checkoutGift(HostedPageCheckoutGiftParams params)
+      throws ChargebeeException {
+    Response response = checkoutGiftRaw(params);
+
+    return HostedPageCheckoutGiftResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * checkoutExisting a hostedPage using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response checkoutExistingRaw(HostedPageCheckoutExistingParams params) throws ChargebeeException {
+
+    return post("/hosted_pages/checkout_existing", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * checkoutExisting a hostedPage using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response checkoutExistingRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/hosted_pages/checkout_existing", jsonPayload);
+  }
+
+  public HostedPageCheckoutExistingResponse checkoutExisting(
+      HostedPageCheckoutExistingParams params) throws ChargebeeException {
+    Response response = checkoutExistingRaw(params);
+
+    return HostedPageCheckoutExistingResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/InAppSubscriptionService.java b/src/main/java/com/chargebee/v4/services/InAppSubscriptionService.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/services/InAppSubscriptionService.java
rename to src/main/java/com/chargebee/v4/services/InAppSubscriptionService.java
index 7bf40968..874e0c33 100644
--- a/src/main/java/com/chargebee/v4/core/services/InAppSubscriptionService.java
+++ b/src/main/java/com/chargebee/v4/services/InAppSubscriptionService.java
@@ -5,27 +5,28 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.inAppSubscription.params.InAppSubscriptionRetrieveStoreSubsParams;
+import com.chargebee.v4.models.inAppSubscription.params.InAppSubscriptionRetrieveStoreSubscriptionsParams;
 
-import com.chargebee.v4.core.models.inAppSubscription.params.InAppSubscriptionImportReceiptParams;
+import com.chargebee.v4.models.inAppSubscription.params.InAppSubscriptionImportReceiptParams;
 
-import com.chargebee.v4.core.models.inAppSubscription.params.InAppSubscriptionImportSubscriptionParams;
+import com.chargebee.v4.models.inAppSubscription.params.InAppSubscriptionImportSubscriptionParams;
 
-import com.chargebee.v4.core.models.inAppSubscription.params.InAppSubscriptionProcessReceiptParams;
+import com.chargebee.v4.models.inAppSubscription.params.InAppSubscriptionProcessReceiptParams;
 
-import com.chargebee.v4.core.responses.inAppSubscription.InAppSubscriptionRetrieveStoreSubsResponse;
+import com.chargebee.v4.models.inAppSubscription.responses.InAppSubscriptionRetrieveStoreSubscriptionsResponse;
 
-import com.chargebee.v4.core.responses.inAppSubscription.InAppSubscriptionImportReceiptResponse;
+import com.chargebee.v4.models.inAppSubscription.responses.InAppSubscriptionImportReceiptResponse;
 
-import com.chargebee.v4.core.responses.inAppSubscription.InAppSubscriptionImportSubscriptionResponse;
+import com.chargebee.v4.models.inAppSubscription.responses.InAppSubscriptionImportSubscriptionResponse;
 
-import com.chargebee.v4.core.responses.inAppSubscription.InAppSubscriptionProcessReceiptResponse;
+import com.chargebee.v4.models.inAppSubscription.responses.InAppSubscriptionProcessReceiptResponse;
 
 public final class InAppSubscriptionService extends BaseService<InAppSubscriptionService> {
 
@@ -62,8 +63,10 @@ public InAppSubscriptionService withOptions(RequestOptions options) {
 
   // === Operations ===
 
-  /** retrieveStoreSubs a inAppSubscription (executes immediately) - returns raw Response. */
-  Response retrieveStoreSubsRaw(String inAppSubscriptionAppId) throws Exception {
+  /**
+   * retrieveStoreSubscriptions a inAppSubscription (executes immediately) - returns raw Response.
+   */
+  Response retrieveStoreSubscriptionsRaw(String inAppSubscriptionAppId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/in_app_subscriptions/{in-app-subscription-app-id}/retrieve",
@@ -74,12 +77,12 @@ Response retrieveStoreSubsRaw(String inAppSubscriptionAppId) throws Exception {
   }
 
   /**
-   * retrieveStoreSubs a inAppSubscription using immutable params (executes immediately) - returns
-   * raw Response.
+   * retrieveStoreSubscriptions a inAppSubscription using immutable params (executes immediately) -
+   * returns raw Response.
    */
-  Response retrieveStoreSubsRaw(
-      String inAppSubscriptionAppId, InAppSubscriptionRetrieveStoreSubsParams params)
-      throws Exception {
+  Response retrieveStoreSubscriptionsRaw(
+      String inAppSubscriptionAppId, InAppSubscriptionRetrieveStoreSubscriptionsParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/in_app_subscriptions/{in-app-subscription-app-id}/retrieve",
@@ -89,11 +92,11 @@ Response retrieveStoreSubsRaw(
   }
 
   /**
-   * retrieveStoreSubs a inAppSubscription using raw JSON payload (executes immediately) - returns
-   * raw Response.
+   * retrieveStoreSubscriptions a inAppSubscription using raw JSON payload (executes immediately) -
+   * returns raw Response.
    */
-  Response retrieveStoreSubsRaw(String inAppSubscriptionAppId, String jsonPayload)
-      throws Exception {
+  Response retrieveStoreSubscriptionsRaw(String inAppSubscriptionAppId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/in_app_subscriptions/{in-app-subscription-app-id}/retrieve",
@@ -102,16 +105,16 @@ Response retrieveStoreSubsRaw(String inAppSubscriptionAppId, String jsonPayload)
     return postJson(path, jsonPayload);
   }
 
-  public InAppSubscriptionRetrieveStoreSubsResponse retrieveStoreSubs(
-      String inAppSubscriptionAppId, InAppSubscriptionRetrieveStoreSubsParams params)
-      throws Exception {
-    Response response = retrieveStoreSubsRaw(inAppSubscriptionAppId, params);
-    return InAppSubscriptionRetrieveStoreSubsResponse.fromJson(
+  public InAppSubscriptionRetrieveStoreSubscriptionsResponse retrieveStoreSubscriptions(
+      String inAppSubscriptionAppId, InAppSubscriptionRetrieveStoreSubscriptionsParams params)
+      throws ChargebeeException {
+    Response response = retrieveStoreSubscriptionsRaw(inAppSubscriptionAppId, params);
+    return InAppSubscriptionRetrieveStoreSubscriptionsResponse.fromJson(
         response.getBodyAsString(), response);
   }
 
   /** importReceipt a inAppSubscription (executes immediately) - returns raw Response. */
-  Response importReceiptRaw(String inAppSubscriptionAppId) throws Exception {
+  Response importReceiptRaw(String inAppSubscriptionAppId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/in_app_subscriptions/{in-app-subscription-app-id}/import_receipt",
@@ -126,7 +129,8 @@ Response importReceiptRaw(String inAppSubscriptionAppId) throws Exception {
    * Response.
    */
   Response importReceiptRaw(
-      String inAppSubscriptionAppId, InAppSubscriptionImportReceiptParams params) throws Exception {
+      String inAppSubscriptionAppId, InAppSubscriptionImportReceiptParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/in_app_subscriptions/{in-app-subscription-app-id}/import_receipt",
@@ -139,7 +143,8 @@ Response importReceiptRaw(
    * importReceipt a inAppSubscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response importReceiptRaw(String inAppSubscriptionAppId, String jsonPayload) throws Exception {
+  Response importReceiptRaw(String inAppSubscriptionAppId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/in_app_subscriptions/{in-app-subscription-app-id}/import_receipt",
@@ -149,13 +154,14 @@ Response importReceiptRaw(String inAppSubscriptionAppId, String jsonPayload) thr
   }
 
   public InAppSubscriptionImportReceiptResponse importReceipt(
-      String inAppSubscriptionAppId, InAppSubscriptionImportReceiptParams params) throws Exception {
+      String inAppSubscriptionAppId, InAppSubscriptionImportReceiptParams params)
+      throws ChargebeeException {
     Response response = importReceiptRaw(inAppSubscriptionAppId, params);
     return InAppSubscriptionImportReceiptResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** importSubscription a inAppSubscription (executes immediately) - returns raw Response. */
-  Response importSubscriptionRaw(String inAppSubscriptionAppId) throws Exception {
+  Response importSubscriptionRaw(String inAppSubscriptionAppId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/in_app_subscriptions/{in-app-subscription-app-id}/import_subscription",
@@ -171,7 +177,7 @@ Response importSubscriptionRaw(String inAppSubscriptionAppId) throws Exception {
    */
   Response importSubscriptionRaw(
       String inAppSubscriptionAppId, InAppSubscriptionImportSubscriptionParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/in_app_subscriptions/{in-app-subscription-app-id}/import_subscription",
@@ -185,7 +191,7 @@ Response importSubscriptionRaw(
    * raw Response.
    */
   Response importSubscriptionRaw(String inAppSubscriptionAppId, String jsonPayload)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/in_app_subscriptions/{in-app-subscription-app-id}/import_subscription",
@@ -196,14 +202,14 @@ Response importSubscriptionRaw(String inAppSubscriptionAppId, String jsonPayload
 
   public InAppSubscriptionImportSubscriptionResponse importSubscription(
       String inAppSubscriptionAppId, InAppSubscriptionImportSubscriptionParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = importSubscriptionRaw(inAppSubscriptionAppId, params);
     return InAppSubscriptionImportSubscriptionResponse.fromJson(
         response.getBodyAsString(), response);
   }
 
   /** processReceipt a inAppSubscription (executes immediately) - returns raw Response. */
-  Response processReceiptRaw(String inAppSubscriptionAppId) throws Exception {
+  Response processReceiptRaw(String inAppSubscriptionAppId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/in_app_subscriptions/{in-app-subscription-app-id}/process_purchase_command",
@@ -219,7 +225,7 @@ Response processReceiptRaw(String inAppSubscriptionAppId) throws Exception {
    */
   Response processReceiptRaw(
       String inAppSubscriptionAppId, InAppSubscriptionProcessReceiptParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/in_app_subscriptions/{in-app-subscription-app-id}/process_purchase_command",
@@ -232,7 +238,8 @@ Response processReceiptRaw(
    * processReceipt a inAppSubscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response processReceiptRaw(String inAppSubscriptionAppId, String jsonPayload) throws Exception {
+  Response processReceiptRaw(String inAppSubscriptionAppId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/in_app_subscriptions/{in-app-subscription-app-id}/process_purchase_command",
@@ -243,7 +250,7 @@ Response processReceiptRaw(String inAppSubscriptionAppId, String jsonPayload) th
 
   public InAppSubscriptionProcessReceiptResponse processReceipt(
       String inAppSubscriptionAppId, InAppSubscriptionProcessReceiptParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = processReceiptRaw(inAppSubscriptionAppId, params);
     return InAppSubscriptionProcessReceiptResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/services/InvoiceService.java b/src/main/java/com/chargebee/v4/services/InvoiceService.java
new file mode 100644
index 00000000..ad4d2284
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/InvoiceService.java
@@ -0,0 +1,1364 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.invoice.params.InvoiceDeleteLineItemsParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceRemoveCreditNoteParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceRemovePaymentParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceStopDunningParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceApplyPaymentsParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceApplyPaymentScheduleSchemeParams;
+
+import com.chargebee.v4.models.invoice.params.VoidInvoiceParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceAddChargeParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceWriteOffParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceAddChargeItemParams;
+
+import com.chargebee.v4.models.invoice.params.InvoicePauseDunningParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceListParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceCreateParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceCloseParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceApplyCreditsParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceRetrieveParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceCreateForChargeItemParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceCreateForChargeItemsAndChargesParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceDeleteImportedParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceUpdateDetailsParams;
+
+import com.chargebee.v4.models.invoice.params.InvoicesForCustomerParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceRecordPaymentParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceDeleteParams;
+
+import com.chargebee.v4.models.invoice.params.ImportInvoiceParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceResumeDunningParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceRecordTaxWithheldParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceRemoveTaxWithheldParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceListPaymentReferenceNumbersParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceCollectPaymentParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceRefundParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceRecordRefundParams;
+
+import com.chargebee.v4.models.invoice.params.InvoicePdfParams;
+
+import com.chargebee.v4.models.invoice.params.InvoicesForSubscriptionParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceChargeAddonParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceAddAddonChargeParams;
+
+import com.chargebee.v4.models.invoice.params.InvoiceChargeParams;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceDeleteLineItemsResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceRemoveCreditNoteResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceRemovePaymentResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceStopDunningResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceApplyPaymentsResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceApplyPaymentScheduleSchemeResponse;
+
+import com.chargebee.v4.models.invoice.responses.VoidInvoiceResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceAddChargeResponse;
+
+import com.chargebee.v4.models.invoice.responses.SendEinvoiceResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoicePaymentSchedulesResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceWriteOffResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceAddChargeItemResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoicePauseDunningResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceListResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceCreateResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceCloseResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceApplyCreditsResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceRetrieveResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceCreateForChargeItemResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceCreateForChargeItemsAndChargesResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceDeleteImportedResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceUpdateDetailsResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoicesForCustomerResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceRecordPaymentResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceDeleteResponse;
+
+import com.chargebee.v4.models.invoice.responses.ImportInvoiceResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceResumeDunningResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceRecordTaxWithheldResponse;
+
+import com.chargebee.v4.models.invoice.responses.ResendEinvoiceResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceRemoveTaxWithheldResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceListPaymentReferenceNumbersResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceCollectPaymentResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceSyncUsagesResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceRefundResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceRecordRefundResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoicePdfResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoicesForSubscriptionResponse;
+
+import com.chargebee.v4.models.invoice.responses.DownloadEinvoiceResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceChargeAddonResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceAddAddonChargeResponse;
+
+import com.chargebee.v4.models.invoice.responses.InvoiceChargeResponse;
+
+public final class InvoiceService extends BaseService<InvoiceService> {
+
+  private final ServiceConfig config;
+
+  public InvoiceService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private InvoiceService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private InvoiceService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  InvoiceService with(RequestOptions newOptions) {
+    return new InvoiceService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public InvoiceService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** deleteLineItems a invoice (executes immediately) - returns raw Response. */
+  Response deleteLineItemsRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/delete_line_items", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * deleteLineItems a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response deleteLineItemsRaw(String invoiceId, InvoiceDeleteLineItemsParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/delete_line_items", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * deleteLineItems a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response deleteLineItemsRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/delete_line_items", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceDeleteLineItemsResponse deleteLineItems(
+      String invoiceId, InvoiceDeleteLineItemsParams params) throws ChargebeeException {
+    Response response = deleteLineItemsRaw(invoiceId, params);
+    return InvoiceDeleteLineItemsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** removeCreditNote a invoice (executes immediately) - returns raw Response. */
+  Response removeCreditNoteRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/remove_credit_note", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * removeCreditNote a invoice using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response removeCreditNoteRaw(String invoiceId, InvoiceRemoveCreditNoteParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/remove_credit_note", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * removeCreditNote a invoice using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response removeCreditNoteRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/remove_credit_note", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceRemoveCreditNoteResponse removeCreditNote(
+      String invoiceId, InvoiceRemoveCreditNoteParams params) throws ChargebeeException {
+    Response response = removeCreditNoteRaw(invoiceId, params);
+    return InvoiceRemoveCreditNoteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** removePayment a invoice (executes immediately) - returns raw Response. */
+  Response removePaymentRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/remove_payment", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * removePayment a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response removePaymentRaw(String invoiceId, InvoiceRemovePaymentParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/remove_payment", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * removePayment a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response removePaymentRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/remove_payment", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceRemovePaymentResponse removePayment(
+      String invoiceId, InvoiceRemovePaymentParams params) throws ChargebeeException {
+    Response response = removePaymentRaw(invoiceId, params);
+    return InvoiceRemovePaymentResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** stopDunning a invoice (executes immediately) - returns raw Response. */
+  Response stopDunningRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/stop_dunning", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /** stopDunning a invoice using immutable params (executes immediately) - returns raw Response. */
+  Response stopDunningRaw(String invoiceId, InvoiceStopDunningParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/stop_dunning", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /** stopDunning a invoice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response stopDunningRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/stop_dunning", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceStopDunningResponse stopDunning(String invoiceId, InvoiceStopDunningParams params)
+      throws ChargebeeException {
+    Response response = stopDunningRaw(invoiceId, params);
+    return InvoiceStopDunningResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** applyPayments a invoice (executes immediately) - returns raw Response. */
+  Response applyPaymentsRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/apply_payments", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * applyPayments a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response applyPaymentsRaw(String invoiceId, InvoiceApplyPaymentsParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/apply_payments", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * applyPayments a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response applyPaymentsRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/apply_payments", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceApplyPaymentsResponse applyPayments(
+      String invoiceId, InvoiceApplyPaymentsParams params) throws ChargebeeException {
+    Response response = applyPaymentsRaw(invoiceId, params);
+    return InvoiceApplyPaymentsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** applyPaymentScheduleScheme a invoice (executes immediately) - returns raw Response. */
+  Response applyPaymentScheduleSchemeRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/invoices/{invoice-id}/apply_payment_schedule_scheme", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * applyPaymentScheduleScheme a invoice using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response applyPaymentScheduleSchemeRaw(
+      String invoiceId, InvoiceApplyPaymentScheduleSchemeParams params) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/invoices/{invoice-id}/apply_payment_schedule_scheme", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * applyPaymentScheduleScheme a invoice using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response applyPaymentScheduleSchemeRaw(String invoiceId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/invoices/{invoice-id}/apply_payment_schedule_scheme", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceApplyPaymentScheduleSchemeResponse applyPaymentScheduleScheme(
+      String invoiceId, InvoiceApplyPaymentScheduleSchemeParams params) throws ChargebeeException {
+    Response response = applyPaymentScheduleSchemeRaw(invoiceId, params);
+    return InvoiceApplyPaymentScheduleSchemeResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** voidInvoice a invoice (executes immediately) - returns raw Response. */
+  Response voidInvoiceRaw(String invoiceId) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/void", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /** voidInvoice a invoice using immutable params (executes immediately) - returns raw Response. */
+  Response voidInvoiceRaw(String invoiceId, VoidInvoiceParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/void", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /** voidInvoice a invoice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response voidInvoiceRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/void", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public VoidInvoiceResponse voidInvoice(String invoiceId, VoidInvoiceParams params)
+      throws ChargebeeException {
+    Response response = voidInvoiceRaw(invoiceId, params);
+    return VoidInvoiceResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** addCharge a invoice (executes immediately) - returns raw Response. */
+  Response addChargeRaw(String invoiceId) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/add_charge", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /** addCharge a invoice using immutable params (executes immediately) - returns raw Response. */
+  Response addChargeRaw(String invoiceId, InvoiceAddChargeParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/add_charge", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /** addCharge a invoice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response addChargeRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/add_charge", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceAddChargeResponse addCharge(String invoiceId, InvoiceAddChargeParams params)
+      throws ChargebeeException {
+    Response response = addChargeRaw(invoiceId, params);
+    return InvoiceAddChargeResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** sendEinvoice a invoice (executes immediately) - returns raw Response. */
+  Response sendEinvoiceRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/send_einvoice", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  public SendEinvoiceResponse sendEinvoice(String invoiceId) throws ChargebeeException {
+    Response response = sendEinvoiceRaw(invoiceId);
+    return SendEinvoiceResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** paymentSchedules a invoice (executes immediately) - returns raw Response. */
+  Response paymentSchedulesRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/payment_schedules", "invoice-id", invoiceId);
+
+    return get(path, null);
+  }
+
+  public InvoicePaymentSchedulesResponse paymentSchedules(String invoiceId)
+      throws ChargebeeException {
+    Response response = paymentSchedulesRaw(invoiceId);
+    return InvoicePaymentSchedulesResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** writeOff a invoice (executes immediately) - returns raw Response. */
+  Response writeOffRaw(String invoiceId) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/write_off", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /** writeOff a invoice using immutable params (executes immediately) - returns raw Response. */
+  Response writeOffRaw(String invoiceId, InvoiceWriteOffParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/write_off", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /** writeOff a invoice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response writeOffRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/write_off", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceWriteOffResponse writeOff(String invoiceId, InvoiceWriteOffParams params)
+      throws ChargebeeException {
+    Response response = writeOffRaw(invoiceId, params);
+    return InvoiceWriteOffResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** addChargeItem a invoice (executes immediately) - returns raw Response. */
+  Response addChargeItemRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/add_charge_item", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * addChargeItem a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response addChargeItemRaw(String invoiceId, InvoiceAddChargeItemParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/add_charge_item", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * addChargeItem a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response addChargeItemRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/add_charge_item", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceAddChargeItemResponse addChargeItem(
+      String invoiceId, InvoiceAddChargeItemParams params) throws ChargebeeException {
+    Response response = addChargeItemRaw(invoiceId, params);
+    return InvoiceAddChargeItemResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** pauseDunning a invoice (executes immediately) - returns raw Response. */
+  Response pauseDunningRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/pause_dunning", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * pauseDunning a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response pauseDunningRaw(String invoiceId, InvoicePauseDunningParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/pause_dunning", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * pauseDunning a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response pauseDunningRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/pause_dunning", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoicePauseDunningResponse pauseDunning(
+      String invoiceId, InvoicePauseDunningParams params) throws ChargebeeException {
+    Response response = pauseDunningRaw(invoiceId, params);
+    return InvoicePauseDunningResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** list a invoice using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(InvoiceListParams params) throws ChargebeeException {
+
+    return get("/invoices", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a invoice without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/invoices", null);
+  }
+
+  /** list a invoice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public InvoiceListResponse list(InvoiceListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return InvoiceListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public InvoiceListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return InvoiceListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** create a invoice using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(InvoiceCreateParams params) throws ChargebeeException {
+
+    return post("/invoices", params != null ? params.toFormData() : null);
+  }
+
+  /** create a invoice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/invoices", jsonPayload);
+  }
+
+  public InvoiceCreateResponse create(InvoiceCreateParams params) throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return InvoiceCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** close a invoice (executes immediately) - returns raw Response. */
+  Response closeRaw(String invoiceId) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/close", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /** close a invoice using immutable params (executes immediately) - returns raw Response. */
+  Response closeRaw(String invoiceId, InvoiceCloseParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/close", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /** close a invoice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response closeRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/close", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceCloseResponse close(String invoiceId, InvoiceCloseParams params)
+      throws ChargebeeException {
+    Response response = closeRaw(invoiceId, params);
+    return InvoiceCloseResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** applyCredits a invoice (executes immediately) - returns raw Response. */
+  Response applyCreditsRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/apply_credits", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * applyCredits a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response applyCreditsRaw(String invoiceId, InvoiceApplyCreditsParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/apply_credits", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * applyCredits a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response applyCreditsRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/apply_credits", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceApplyCreditsResponse applyCredits(
+      String invoiceId, InvoiceApplyCreditsParams params) throws ChargebeeException {
+    Response response = applyCreditsRaw(invoiceId, params);
+    return InvoiceApplyCreditsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a invoice (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String invoiceId) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}", "invoice-id", invoiceId);
+
+    return get(path, null);
+  }
+
+  /** retrieve a invoice using immutable params (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String invoiceId, InvoiceRetrieveParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}", "invoice-id", invoiceId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  public InvoiceRetrieveResponse retrieve(String invoiceId, InvoiceRetrieveParams params)
+      throws ChargebeeException {
+    Response response = retrieveRaw(invoiceId, params);
+    return InvoiceRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  public InvoiceRetrieveResponse retrieve(String invoiceId) throws ChargebeeException {
+    Response response = retrieveRaw(invoiceId);
+    return InvoiceRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createForChargeItem a invoice using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response createForChargeItemRaw(InvoiceCreateForChargeItemParams params)
+      throws ChargebeeException {
+
+    return post("/invoices/create_for_charge_item", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createForChargeItem a invoice using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response createForChargeItemRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/invoices/create_for_charge_item", jsonPayload);
+  }
+
+  public InvoiceCreateForChargeItemResponse createForChargeItem(
+      InvoiceCreateForChargeItemParams params) throws ChargebeeException {
+    Response response = createForChargeItemRaw(params);
+
+    return InvoiceCreateForChargeItemResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createForChargeItemsAndCharges a invoice using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response createForChargeItemsAndChargesRaw(InvoiceCreateForChargeItemsAndChargesParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/invoices/create_for_charge_items_and_charges",
+        params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createForChargeItemsAndCharges a invoice using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response createForChargeItemsAndChargesRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/invoices/create_for_charge_items_and_charges", jsonPayload);
+  }
+
+  public InvoiceCreateForChargeItemsAndChargesResponse createForChargeItemsAndCharges(
+      InvoiceCreateForChargeItemsAndChargesParams params) throws ChargebeeException {
+    Response response = createForChargeItemsAndChargesRaw(params);
+
+    return InvoiceCreateForChargeItemsAndChargesResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /** deleteImported a invoice (executes immediately) - returns raw Response. */
+  Response deleteImportedRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/delete_imported", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * deleteImported a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response deleteImportedRaw(String invoiceId, InvoiceDeleteImportedParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/delete_imported", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * deleteImported a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response deleteImportedRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/delete_imported", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceDeleteImportedResponse deleteImported(
+      String invoiceId, InvoiceDeleteImportedParams params) throws ChargebeeException {
+    Response response = deleteImportedRaw(invoiceId, params);
+    return InvoiceDeleteImportedResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** updateDetails a invoice (executes immediately) - returns raw Response. */
+  Response updateDetailsRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/update_details", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * updateDetails a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response updateDetailsRaw(String invoiceId, InvoiceUpdateDetailsParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/update_details", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * updateDetails a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response updateDetailsRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/update_details", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceUpdateDetailsResponse updateDetails(
+      String invoiceId, InvoiceUpdateDetailsParams params) throws ChargebeeException {
+    Response response = updateDetailsRaw(invoiceId, params);
+    return InvoiceUpdateDetailsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * invoicesForCustomer a invoice using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response invoicesForCustomerRaw(String customerId, InvoicesForCustomerParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/invoices", "customer-id", customerId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /** invoicesForCustomer a invoice without params (executes immediately) - returns raw Response. */
+  Response invoicesForCustomerRaw(String customerId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/invoices", "customer-id", customerId);
+    return get(path, null);
+  }
+
+  /**
+   * invoicesForCustomer a invoice using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response invoicesForCustomerRaw(String customerId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/invoices", "customer-id", customerId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public InvoicesForCustomerResponse invoicesForCustomer(
+      String customerId, InvoicesForCustomerParams params) throws ChargebeeException {
+    Response response = invoicesForCustomerRaw(customerId, params);
+    return InvoicesForCustomerResponse.fromJson(
+        response.getBodyAsString(), this, params, customerId, response);
+  }
+
+  public InvoicesForCustomerResponse invoicesForCustomer(String customerId)
+      throws ChargebeeException {
+    Response response = invoicesForCustomerRaw(customerId);
+    return InvoicesForCustomerResponse.fromJson(
+        response.getBodyAsString(), this, null, customerId, response);
+  }
+
+  /** recordPayment a invoice (executes immediately) - returns raw Response. */
+  Response recordPaymentRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/record_payment", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * recordPayment a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response recordPaymentRaw(String invoiceId, InvoiceRecordPaymentParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/record_payment", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * recordPayment a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response recordPaymentRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/record_payment", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceRecordPaymentResponse recordPayment(
+      String invoiceId, InvoiceRecordPaymentParams params) throws ChargebeeException {
+    Response response = recordPaymentRaw(invoiceId, params);
+    return InvoiceRecordPaymentResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** delete a invoice (executes immediately) - returns raw Response. */
+  Response deleteRaw(String invoiceId) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/delete", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /** delete a invoice using immutable params (executes immediately) - returns raw Response. */
+  Response deleteRaw(String invoiceId, InvoiceDeleteParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/delete", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /** delete a invoice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response deleteRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/delete", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceDeleteResponse delete(String invoiceId, InvoiceDeleteParams params)
+      throws ChargebeeException {
+    Response response = deleteRaw(invoiceId, params);
+    return InvoiceDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * importInvoice a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response importInvoiceRaw(ImportInvoiceParams params) throws ChargebeeException {
+
+    return post("/invoices/import_invoice", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * importInvoice a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response importInvoiceRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/invoices/import_invoice", jsonPayload);
+  }
+
+  public ImportInvoiceResponse importInvoice(ImportInvoiceParams params) throws ChargebeeException {
+    Response response = importInvoiceRaw(params);
+
+    return ImportInvoiceResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** resumeDunning a invoice (executes immediately) - returns raw Response. */
+  Response resumeDunningRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/resume_dunning", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * resumeDunning a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response resumeDunningRaw(String invoiceId, InvoiceResumeDunningParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/resume_dunning", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * resumeDunning a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response resumeDunningRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/resume_dunning", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceResumeDunningResponse resumeDunning(
+      String invoiceId, InvoiceResumeDunningParams params) throws ChargebeeException {
+    Response response = resumeDunningRaw(invoiceId, params);
+    return InvoiceResumeDunningResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** recordTaxWithheld a invoice (executes immediately) - returns raw Response. */
+  Response recordTaxWithheldRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/record_tax_withheld", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * recordTaxWithheld a invoice using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response recordTaxWithheldRaw(String invoiceId, InvoiceRecordTaxWithheldParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/record_tax_withheld", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * recordTaxWithheld a invoice using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response recordTaxWithheldRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/record_tax_withheld", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceRecordTaxWithheldResponse recordTaxWithheld(
+      String invoiceId, InvoiceRecordTaxWithheldParams params) throws ChargebeeException {
+    Response response = recordTaxWithheldRaw(invoiceId, params);
+    return InvoiceRecordTaxWithheldResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** resendEinvoice a invoice (executes immediately) - returns raw Response. */
+  Response resendEinvoiceRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/resend_einvoice", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  public ResendEinvoiceResponse resendEinvoice(String invoiceId) throws ChargebeeException {
+    Response response = resendEinvoiceRaw(invoiceId);
+    return ResendEinvoiceResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** removeTaxWithheld a invoice (executes immediately) - returns raw Response. */
+  Response removeTaxWithheldRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/remove_tax_withheld", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * removeTaxWithheld a invoice using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response removeTaxWithheldRaw(String invoiceId, InvoiceRemoveTaxWithheldParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/remove_tax_withheld", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * removeTaxWithheld a invoice using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response removeTaxWithheldRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/remove_tax_withheld", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceRemoveTaxWithheldResponse removeTaxWithheld(
+      String invoiceId, InvoiceRemoveTaxWithheldParams params) throws ChargebeeException {
+    Response response = removeTaxWithheldRaw(invoiceId, params);
+    return InvoiceRemoveTaxWithheldResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * listPaymentReferenceNumbers a invoice using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response listPaymentReferenceNumbersRaw(InvoiceListPaymentReferenceNumbersParams params)
+      throws ChargebeeException {
+
+    return get(
+        "/invoices/payment_reference_numbers", params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * listPaymentReferenceNumbers a invoice without params (executes immediately) - returns raw
+   * Response.
+   */
+  Response listPaymentReferenceNumbersRaw() throws ChargebeeException {
+
+    return get("/invoices/payment_reference_numbers", null);
+  }
+
+  /**
+   * listPaymentReferenceNumbers a invoice using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response listPaymentReferenceNumbersRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public InvoiceListPaymentReferenceNumbersResponse listPaymentReferenceNumbers(
+      InvoiceListPaymentReferenceNumbersParams params) throws ChargebeeException {
+    Response response = listPaymentReferenceNumbersRaw(params);
+
+    return InvoiceListPaymentReferenceNumbersResponse.fromJson(
+        response.getBodyAsString(), this, params, response);
+  }
+
+  public InvoiceListPaymentReferenceNumbersResponse listPaymentReferenceNumbers()
+      throws ChargebeeException {
+    Response response = listPaymentReferenceNumbersRaw();
+    return InvoiceListPaymentReferenceNumbersResponse.fromJson(
+        response.getBodyAsString(), this, null, response);
+  }
+
+  /** collectPayment a invoice (executes immediately) - returns raw Response. */
+  Response collectPaymentRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/collect_payment", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * collectPayment a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response collectPaymentRaw(String invoiceId, InvoiceCollectPaymentParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/collect_payment", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * collectPayment a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response collectPaymentRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/collect_payment", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceCollectPaymentResponse collectPayment(
+      String invoiceId, InvoiceCollectPaymentParams params) throws ChargebeeException {
+    Response response = collectPaymentRaw(invoiceId, params);
+    return InvoiceCollectPaymentResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** syncUsages a invoice (executes immediately) - returns raw Response. */
+  Response syncUsagesRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/sync_usages", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  public InvoiceSyncUsagesResponse syncUsages(String invoiceId) throws ChargebeeException {
+    Response response = syncUsagesRaw(invoiceId);
+    return InvoiceSyncUsagesResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** refund a invoice (executes immediately) - returns raw Response. */
+  Response refundRaw(String invoiceId) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/refund", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /** refund a invoice using immutable params (executes immediately) - returns raw Response. */
+  Response refundRaw(String invoiceId, InvoiceRefundParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/refund", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /** refund a invoice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response refundRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/refund", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceRefundResponse refund(String invoiceId, InvoiceRefundParams params)
+      throws ChargebeeException {
+    Response response = refundRaw(invoiceId, params);
+    return InvoiceRefundResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** recordRefund a invoice (executes immediately) - returns raw Response. */
+  Response recordRefundRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/record_refund", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * recordRefund a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response recordRefundRaw(String invoiceId, InvoiceRecordRefundParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/record_refund", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * recordRefund a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response recordRefundRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/record_refund", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceRecordRefundResponse recordRefund(
+      String invoiceId, InvoiceRecordRefundParams params) throws ChargebeeException {
+    Response response = recordRefundRaw(invoiceId, params);
+    return InvoiceRecordRefundResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** pdf a invoice (executes immediately) - returns raw Response. */
+  Response pdfRaw(String invoiceId) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/pdf", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /** pdf a invoice using immutable params (executes immediately) - returns raw Response. */
+  Response pdfRaw(String invoiceId, InvoicePdfParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/pdf", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /** pdf a invoice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response pdfRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/pdf", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoicePdfResponse pdf(String invoiceId, InvoicePdfParams params)
+      throws ChargebeeException {
+    Response response = pdfRaw(invoiceId, params);
+    return InvoicePdfResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * invoicesForSubscription a invoice using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response invoicesForSubscriptionRaw(String subscriptionId, InvoicesForSubscriptionParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/invoices", "subscription-id", subscriptionId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * invoicesForSubscription a invoice without params (executes immediately) - returns raw Response.
+   */
+  Response invoicesForSubscriptionRaw(String subscriptionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/invoices", "subscription-id", subscriptionId);
+    return get(path, null);
+  }
+
+  /**
+   * invoicesForSubscription a invoice using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response invoicesForSubscriptionRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/invoices", "subscription-id", subscriptionId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public InvoicesForSubscriptionResponse invoicesForSubscription(
+      String subscriptionId, InvoicesForSubscriptionParams params) throws ChargebeeException {
+    Response response = invoicesForSubscriptionRaw(subscriptionId, params);
+    return InvoicesForSubscriptionResponse.fromJson(
+        response.getBodyAsString(), this, params, subscriptionId, response);
+  }
+
+  public InvoicesForSubscriptionResponse invoicesForSubscription(String subscriptionId)
+      throws ChargebeeException {
+    Response response = invoicesForSubscriptionRaw(subscriptionId);
+    return InvoicesForSubscriptionResponse.fromJson(
+        response.getBodyAsString(), this, null, subscriptionId, response);
+  }
+
+  /** downloadEinvoice a invoice (executes immediately) - returns raw Response. */
+  Response downloadEinvoiceRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/download_einvoice", "invoice-id", invoiceId);
+
+    return get(path, null);
+  }
+
+  public DownloadEinvoiceResponse downloadEinvoice(String invoiceId) throws ChargebeeException {
+    Response response = downloadEinvoiceRaw(invoiceId);
+    return DownloadEinvoiceResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** chargeAddon a invoice using immutable params (executes immediately) - returns raw Response. */
+  Response chargeAddonRaw(InvoiceChargeAddonParams params) throws ChargebeeException {
+
+    return post("/invoices/charge_addon", params != null ? params.toFormData() : null);
+  }
+
+  /** chargeAddon a invoice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response chargeAddonRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/invoices/charge_addon", jsonPayload);
+  }
+
+  public InvoiceChargeAddonResponse chargeAddon(InvoiceChargeAddonParams params)
+      throws ChargebeeException {
+    Response response = chargeAddonRaw(params);
+
+    return InvoiceChargeAddonResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** addAddonCharge a invoice (executes immediately) - returns raw Response. */
+  Response addAddonChargeRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/add_addon_charge", "invoice-id", invoiceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * addAddonCharge a invoice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response addAddonChargeRaw(String invoiceId, InvoiceAddAddonChargeParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/add_addon_charge", "invoice-id", invoiceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * addAddonCharge a invoice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response addAddonChargeRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/add_addon_charge", "invoice-id", invoiceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public InvoiceAddAddonChargeResponse addAddonCharge(
+      String invoiceId, InvoiceAddAddonChargeParams params) throws ChargebeeException {
+    Response response = addAddonChargeRaw(invoiceId, params);
+    return InvoiceAddAddonChargeResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** charge a invoice using immutable params (executes immediately) - returns raw Response. */
+  Response chargeRaw(InvoiceChargeParams params) throws ChargebeeException {
+
+    return post("/invoices/charge", params != null ? params.toFormData() : null);
+  }
+
+  /** charge a invoice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response chargeRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/invoices/charge", jsonPayload);
+  }
+
+  public InvoiceChargeResponse charge(InvoiceChargeParams params) throws ChargebeeException {
+    Response response = chargeRaw(params);
+
+    return InvoiceChargeResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/ItemEntitlementService.java b/src/main/java/com/chargebee/v4/services/ItemEntitlementService.java
new file mode 100644
index 00000000..c832d093
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/ItemEntitlementService.java
@@ -0,0 +1,225 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.itemEntitlement.params.ItemEntitlementsForFeatureParams;
+
+import com.chargebee.v4.models.itemEntitlement.params.AddItemEntitlementsParams;
+
+import com.chargebee.v4.models.itemEntitlement.params.ItemEntitlementsForItemParams;
+
+import com.chargebee.v4.models.itemEntitlement.params.UpsertOrRemoveItemEntitlementsForItemParams;
+
+import com.chargebee.v4.models.itemEntitlement.responses.ItemEntitlementsForFeatureResponse;
+
+import com.chargebee.v4.models.itemEntitlement.responses.AddItemEntitlementsResponse;
+
+import com.chargebee.v4.models.itemEntitlement.responses.ItemEntitlementsForItemResponse;
+
+import com.chargebee.v4.models.itemEntitlement.responses.UpsertOrRemoveItemEntitlementsForItemResponse;
+
+public final class ItemEntitlementService extends BaseService<ItemEntitlementService> {
+
+  private final ServiceConfig config;
+
+  public ItemEntitlementService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private ItemEntitlementService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private ItemEntitlementService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  ItemEntitlementService with(RequestOptions newOptions) {
+    return new ItemEntitlementService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public ItemEntitlementService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * itemEntitlementsForFeature a itemEntitlement using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response itemEntitlementsForFeatureRaw(String featureId, ItemEntitlementsForFeatureParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/features/{feature-id}/item_entitlements", "feature-id", featureId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * itemEntitlementsForFeature a itemEntitlement without params (executes immediately) - returns
+   * raw Response.
+   */
+  Response itemEntitlementsForFeatureRaw(String featureId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/features/{feature-id}/item_entitlements", "feature-id", featureId);
+    return get(path, null);
+  }
+
+  /**
+   * itemEntitlementsForFeature a itemEntitlement using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response itemEntitlementsForFeatureRaw(String featureId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/features/{feature-id}/item_entitlements", "feature-id", featureId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public ItemEntitlementsForFeatureResponse itemEntitlementsForFeature(
+      String featureId, ItemEntitlementsForFeatureParams params) throws ChargebeeException {
+    Response response = itemEntitlementsForFeatureRaw(featureId, params);
+    return ItemEntitlementsForFeatureResponse.fromJson(
+        response.getBodyAsString(), this, params, featureId, response);
+  }
+
+  public ItemEntitlementsForFeatureResponse itemEntitlementsForFeature(String featureId)
+      throws ChargebeeException {
+    Response response = itemEntitlementsForFeatureRaw(featureId);
+    return ItemEntitlementsForFeatureResponse.fromJson(
+        response.getBodyAsString(), this, null, featureId, response);
+  }
+
+  /** addItemEntitlements a itemEntitlement (executes immediately) - returns raw Response. */
+  Response addItemEntitlementsRaw(String featureId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/features/{feature-id}/item_entitlements", "feature-id", featureId);
+
+    return post(path, null);
+  }
+
+  /**
+   * addItemEntitlements a itemEntitlement using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response addItemEntitlementsRaw(String featureId, AddItemEntitlementsParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/features/{feature-id}/item_entitlements", "feature-id", featureId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * addItemEntitlements a itemEntitlement using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response addItemEntitlementsRaw(String featureId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/features/{feature-id}/item_entitlements", "feature-id", featureId);
+    return postJson(path, jsonPayload);
+  }
+
+  public AddItemEntitlementsResponse addItemEntitlements(
+      String featureId, AddItemEntitlementsParams params) throws ChargebeeException {
+    Response response = addItemEntitlementsRaw(featureId, params);
+    return AddItemEntitlementsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * itemEntitlementsForItem a itemEntitlement using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response itemEntitlementsForItemRaw(String itemId, ItemEntitlementsForItemParams params)
+      throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/item_entitlements", "item-id", itemId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * itemEntitlementsForItem a itemEntitlement without params (executes immediately) - returns raw
+   * Response.
+   */
+  Response itemEntitlementsForItemRaw(String itemId) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/item_entitlements", "item-id", itemId);
+    return get(path, null);
+  }
+
+  /**
+   * itemEntitlementsForItem a itemEntitlement using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response itemEntitlementsForItemRaw(String itemId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/item_entitlements", "item-id", itemId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public ItemEntitlementsForItemResponse itemEntitlementsForItem(
+      String itemId, ItemEntitlementsForItemParams params) throws ChargebeeException {
+    Response response = itemEntitlementsForItemRaw(itemId, params);
+    return ItemEntitlementsForItemResponse.fromJson(
+        response.getBodyAsString(), this, params, itemId, response);
+  }
+
+  public ItemEntitlementsForItemResponse itemEntitlementsForItem(String itemId)
+      throws ChargebeeException {
+    Response response = itemEntitlementsForItemRaw(itemId);
+    return ItemEntitlementsForItemResponse.fromJson(
+        response.getBodyAsString(), this, null, itemId, response);
+  }
+
+  /**
+   * upsertOrRemoveItemEntitlementsForItem a itemEntitlement (executes immediately) - returns raw
+   * Response.
+   */
+  Response upsertOrRemoveItemEntitlementsForItemRaw(String itemId) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/item_entitlements", "item-id", itemId);
+
+    return post(path, null);
+  }
+
+  /**
+   * upsertOrRemoveItemEntitlementsForItem a itemEntitlement using immutable params (executes
+   * immediately) - returns raw Response.
+   */
+  Response upsertOrRemoveItemEntitlementsForItemRaw(
+      String itemId, UpsertOrRemoveItemEntitlementsForItemParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/item_entitlements", "item-id", itemId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * upsertOrRemoveItemEntitlementsForItem a itemEntitlement using raw JSON payload (executes
+   * immediately) - returns raw Response.
+   */
+  Response upsertOrRemoveItemEntitlementsForItemRaw(String itemId, String jsonPayload)
+      throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/item_entitlements", "item-id", itemId);
+    return postJson(path, jsonPayload);
+  }
+
+  public UpsertOrRemoveItemEntitlementsForItemResponse upsertOrRemoveItemEntitlementsForItem(
+      String itemId, UpsertOrRemoveItemEntitlementsForItemParams params) throws ChargebeeException {
+    Response response = upsertOrRemoveItemEntitlementsForItemRaw(itemId, params);
+    return UpsertOrRemoveItemEntitlementsForItemResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/ItemFamilyService.java b/src/main/java/com/chargebee/v4/services/ItemFamilyService.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/services/ItemFamilyService.java
rename to src/main/java/com/chargebee/v4/services/ItemFamilyService.java
index 4b07467d..2cce05e9 100644
--- a/src/main/java/com/chargebee/v4/core/services/ItemFamilyService.java
+++ b/src/main/java/com/chargebee/v4/services/ItemFamilyService.java
@@ -5,27 +5,28 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.itemFamily.params.ItemFamilyListParams;
+import com.chargebee.v4.models.itemFamily.params.ItemFamilyListParams;
 
-import com.chargebee.v4.core.models.itemFamily.params.ItemFamilyCreateParams;
+import com.chargebee.v4.models.itemFamily.params.ItemFamilyCreateParams;
 
-import com.chargebee.v4.core.models.itemFamily.params.ItemFamilyUpdateParams;
+import com.chargebee.v4.models.itemFamily.params.ItemFamilyUpdateParams;
 
-import com.chargebee.v4.core.responses.itemFamily.ItemFamilyDeleteResponse;
+import com.chargebee.v4.models.itemFamily.responses.ItemFamilyDeleteResponse;
 
-import com.chargebee.v4.core.responses.itemFamily.ItemFamilyListResponse;
+import com.chargebee.v4.models.itemFamily.responses.ItemFamilyListResponse;
 
-import com.chargebee.v4.core.responses.itemFamily.ItemFamilyCreateResponse;
+import com.chargebee.v4.models.itemFamily.responses.ItemFamilyCreateResponse;
 
-import com.chargebee.v4.core.responses.itemFamily.ItemFamilyRetrieveResponse;
+import com.chargebee.v4.models.itemFamily.responses.ItemFamilyRetrieveResponse;
 
-import com.chargebee.v4.core.responses.itemFamily.ItemFamilyUpdateResponse;
+import com.chargebee.v4.models.itemFamily.responses.ItemFamilyUpdateResponse;
 
 public final class ItemFamilyService extends BaseService<ItemFamilyService> {
 
@@ -62,7 +63,7 @@ public ItemFamilyService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** delete a itemFamily (executes immediately) - returns raw Response. */
-  Response deleteRaw(String itemFamilyId) throws Exception {
+  Response deleteRaw(String itemFamilyId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/item_families/{item-family-id}/delete", "item-family-id", itemFamilyId);
@@ -70,73 +71,73 @@ Response deleteRaw(String itemFamilyId) throws Exception {
     return post(path, null);
   }
 
-  public ItemFamilyDeleteResponse delete(String itemFamilyId) throws Exception {
+  public ItemFamilyDeleteResponse delete(String itemFamilyId) throws ChargebeeException {
     Response response = deleteRaw(itemFamilyId);
     return ItemFamilyDeleteResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** list a itemFamily using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(ItemFamilyListParams params) throws Exception {
+  Response listRaw(ItemFamilyListParams params) throws ChargebeeException {
 
     return get("/item_families", params != null ? params.toQueryParams() : null);
   }
 
   /** list a itemFamily without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/item_families", null);
   }
 
   /** list a itemFamily using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public ItemFamilyListResponse list(ItemFamilyListParams params) throws Exception {
+  public ItemFamilyListResponse list(ItemFamilyListParams params) throws ChargebeeException {
     Response response = listRaw(params);
 
     return ItemFamilyListResponse.fromJson(response.getBodyAsString(), this, params, response);
   }
 
-  public ItemFamilyListResponse list() throws Exception {
+  public ItemFamilyListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return ItemFamilyListResponse.fromJson(response.getBodyAsString(), this, null, response);
   }
 
   /** create a itemFamily using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(ItemFamilyCreateParams params) throws Exception {
+  Response createRaw(ItemFamilyCreateParams params) throws ChargebeeException {
 
     return post("/item_families", params != null ? params.toFormData() : null);
   }
 
   /** create a itemFamily using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/item_families", jsonPayload);
   }
 
-  public ItemFamilyCreateResponse create(ItemFamilyCreateParams params) throws Exception {
+  public ItemFamilyCreateResponse create(ItemFamilyCreateParams params) throws ChargebeeException {
     Response response = createRaw(params);
 
     return ItemFamilyCreateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** retrieve a itemFamily (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String itemFamilyId) throws Exception {
+  Response retrieveRaw(String itemFamilyId) throws ChargebeeException {
     String path =
         buildPathWithParams("/item_families/{item-family-id}", "item-family-id", itemFamilyId);
 
     return get(path, null);
   }
 
-  public ItemFamilyRetrieveResponse retrieve(String itemFamilyId) throws Exception {
+  public ItemFamilyRetrieveResponse retrieve(String itemFamilyId) throws ChargebeeException {
     Response response = retrieveRaw(itemFamilyId);
     return ItemFamilyRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a itemFamily (executes immediately) - returns raw Response. */
-  Response updateRaw(String itemFamilyId) throws Exception {
+  Response updateRaw(String itemFamilyId) throws ChargebeeException {
     String path =
         buildPathWithParams("/item_families/{item-family-id}", "item-family-id", itemFamilyId);
 
@@ -144,21 +145,21 @@ Response updateRaw(String itemFamilyId) throws Exception {
   }
 
   /** update a itemFamily using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String itemFamilyId, ItemFamilyUpdateParams params) throws Exception {
+  Response updateRaw(String itemFamilyId, ItemFamilyUpdateParams params) throws ChargebeeException {
     String path =
         buildPathWithParams("/item_families/{item-family-id}", "item-family-id", itemFamilyId);
     return post(path, params.toFormData());
   }
 
   /** update a itemFamily using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String itemFamilyId, String jsonPayload) throws Exception {
+  Response updateRaw(String itemFamilyId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/item_families/{item-family-id}", "item-family-id", itemFamilyId);
     return postJson(path, jsonPayload);
   }
 
   public ItemFamilyUpdateResponse update(String itemFamilyId, ItemFamilyUpdateParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = updateRaw(itemFamilyId, params);
     return ItemFamilyUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/services/ItemPriceService.java b/src/main/java/com/chargebee/v4/services/ItemPriceService.java
new file mode 100644
index 00000000..079b59a0
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/ItemPriceService.java
@@ -0,0 +1,303 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.itemPrice.params.ItemPriceFindApplicableItemsParams;
+
+import com.chargebee.v4.models.itemPrice.params.MoveItemPriceParams;
+
+import com.chargebee.v4.models.itemPrice.params.ItemPriceUpdateParams;
+
+import com.chargebee.v4.models.itemPrice.params.FindApplicableItemPricesParams;
+
+import com.chargebee.v4.models.itemPrice.params.ItemPriceListParams;
+
+import com.chargebee.v4.models.itemPrice.params.ItemPriceCreateParams;
+
+import com.chargebee.v4.models.itemPrice.responses.ItemPriceFindApplicableItemsResponse;
+
+import com.chargebee.v4.models.itemPrice.responses.MoveItemPriceResponse;
+
+import com.chargebee.v4.models.itemPrice.responses.ItemPriceRetrieveResponse;
+
+import com.chargebee.v4.models.itemPrice.responses.ItemPriceUpdateResponse;
+
+import com.chargebee.v4.models.itemPrice.responses.ItemPriceDeleteResponse;
+
+import com.chargebee.v4.models.itemPrice.responses.FindApplicableItemPricesResponse;
+
+import com.chargebee.v4.models.itemPrice.responses.ItemPriceListResponse;
+
+import com.chargebee.v4.models.itemPrice.responses.ItemPriceCreateResponse;
+
+public final class ItemPriceService extends BaseService<ItemPriceService> {
+
+  private final ServiceConfig config;
+
+  public ItemPriceService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private ItemPriceService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private ItemPriceService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  ItemPriceService with(RequestOptions newOptions) {
+    return new ItemPriceService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public ItemPriceService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * findApplicableItems a itemPrice using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response findApplicableItemsRaw(String itemPriceId, ItemPriceFindApplicableItemsParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/item_prices/{item-price-id}/applicable_items", "item-price-id", itemPriceId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * findApplicableItems a itemPrice without params (executes immediately) - returns raw Response.
+   */
+  Response findApplicableItemsRaw(String itemPriceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/item_prices/{item-price-id}/applicable_items", "item-price-id", itemPriceId);
+    return get(path, null);
+  }
+
+  /**
+   * findApplicableItems a itemPrice using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response findApplicableItemsRaw(String itemPriceId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/item_prices/{item-price-id}/applicable_items", "item-price-id", itemPriceId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public ItemPriceFindApplicableItemsResponse findApplicableItems(
+      String itemPriceId, ItemPriceFindApplicableItemsParams params) throws ChargebeeException {
+    Response response = findApplicableItemsRaw(itemPriceId, params);
+    return ItemPriceFindApplicableItemsResponse.fromJson(
+        response.getBodyAsString(), this, params, itemPriceId, response);
+  }
+
+  public ItemPriceFindApplicableItemsResponse findApplicableItems(String itemPriceId)
+      throws ChargebeeException {
+    Response response = findApplicableItemsRaw(itemPriceId);
+    return ItemPriceFindApplicableItemsResponse.fromJson(
+        response.getBodyAsString(), this, null, itemPriceId, response);
+  }
+
+  /** moveItemPrice a itemPrice (executes immediately) - returns raw Response. */
+  Response moveItemPriceRaw(String itemPriceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/item_prices/{item-price-id}/move", "item-price-id", itemPriceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * moveItemPrice a itemPrice using immutable params (executes immediately) - returns raw Response.
+   */
+  Response moveItemPriceRaw(String itemPriceId, MoveItemPriceParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/item_prices/{item-price-id}/move", "item-price-id", itemPriceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * moveItemPrice a itemPrice using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response moveItemPriceRaw(String itemPriceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/item_prices/{item-price-id}/move", "item-price-id", itemPriceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public MoveItemPriceResponse moveItemPrice(String itemPriceId, MoveItemPriceParams params)
+      throws ChargebeeException {
+    Response response = moveItemPriceRaw(itemPriceId, params);
+    return MoveItemPriceResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a itemPrice (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String itemPriceId) throws ChargebeeException {
+    String path = buildPathWithParams("/item_prices/{item-price-id}", "item-price-id", itemPriceId);
+
+    return get(path, null);
+  }
+
+  public ItemPriceRetrieveResponse retrieve(String itemPriceId) throws ChargebeeException {
+    Response response = retrieveRaw(itemPriceId);
+    return ItemPriceRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** update a itemPrice (executes immediately) - returns raw Response. */
+  Response updateRaw(String itemPriceId) throws ChargebeeException {
+    String path = buildPathWithParams("/item_prices/{item-price-id}", "item-price-id", itemPriceId);
+
+    return post(path, null);
+  }
+
+  /** update a itemPrice using immutable params (executes immediately) - returns raw Response. */
+  Response updateRaw(String itemPriceId, ItemPriceUpdateParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/item_prices/{item-price-id}", "item-price-id", itemPriceId);
+    return post(path, params.toFormData());
+  }
+
+  /** update a itemPrice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response updateRaw(String itemPriceId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/item_prices/{item-price-id}", "item-price-id", itemPriceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public ItemPriceUpdateResponse update(String itemPriceId, ItemPriceUpdateParams params)
+      throws ChargebeeException {
+    Response response = updateRaw(itemPriceId, params);
+    return ItemPriceUpdateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** delete a itemPrice (executes immediately) - returns raw Response. */
+  Response deleteRaw(String itemPriceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/item_prices/{item-price-id}/delete", "item-price-id", itemPriceId);
+
+    return post(path, null);
+  }
+
+  public ItemPriceDeleteResponse delete(String itemPriceId) throws ChargebeeException {
+    Response response = deleteRaw(itemPriceId);
+    return ItemPriceDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * findApplicableItemPrices a itemPrice using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response findApplicableItemPricesRaw(String itemPriceId, FindApplicableItemPricesParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/item_prices/{item-price-id}/applicable_item_prices", "item-price-id", itemPriceId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * findApplicableItemPrices a itemPrice without params (executes immediately) - returns raw
+   * Response.
+   */
+  Response findApplicableItemPricesRaw(String itemPriceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/item_prices/{item-price-id}/applicable_item_prices", "item-price-id", itemPriceId);
+    return get(path, null);
+  }
+
+  /**
+   * findApplicableItemPrices a itemPrice using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response findApplicableItemPricesRaw(String itemPriceId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/item_prices/{item-price-id}/applicable_item_prices", "item-price-id", itemPriceId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public FindApplicableItemPricesResponse findApplicableItemPrices(
+      String itemPriceId, FindApplicableItemPricesParams params) throws ChargebeeException {
+    Response response = findApplicableItemPricesRaw(itemPriceId, params);
+    return FindApplicableItemPricesResponse.fromJson(
+        response.getBodyAsString(), this, params, itemPriceId, response);
+  }
+
+  public FindApplicableItemPricesResponse findApplicableItemPrices(String itemPriceId)
+      throws ChargebeeException {
+    Response response = findApplicableItemPricesRaw(itemPriceId);
+    return FindApplicableItemPricesResponse.fromJson(
+        response.getBodyAsString(), this, null, itemPriceId, response);
+  }
+
+  /** list a itemPrice using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(ItemPriceListParams params) throws ChargebeeException {
+
+    return get("/item_prices", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a itemPrice without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/item_prices", null);
+  }
+
+  /** list a itemPrice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public ItemPriceListResponse list(ItemPriceListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return ItemPriceListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public ItemPriceListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return ItemPriceListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** create a itemPrice using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(ItemPriceCreateParams params) throws ChargebeeException {
+
+    return post("/item_prices", params != null ? params.toFormData() : null);
+  }
+
+  /** create a itemPrice using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/item_prices", jsonPayload);
+  }
+
+  public ItemPriceCreateResponse create(ItemPriceCreateParams params) throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return ItemPriceCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/ItemService.java b/src/main/java/com/chargebee/v4/services/ItemService.java
new file mode 100644
index 00000000..3ee5fee7
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/ItemService.java
@@ -0,0 +1,160 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.item.params.ItemListParams;
+
+import com.chargebee.v4.models.item.params.ItemCreateParams;
+
+import com.chargebee.v4.models.item.params.ItemUpdateParams;
+
+import com.chargebee.v4.models.item.responses.ItemListResponse;
+
+import com.chargebee.v4.models.item.responses.ItemCreateResponse;
+
+import com.chargebee.v4.models.item.responses.ItemDeleteResponse;
+
+import com.chargebee.v4.models.item.responses.ItemRetrieveResponse;
+
+import com.chargebee.v4.models.item.responses.ItemUpdateResponse;
+
+public final class ItemService extends BaseService<ItemService> {
+
+  private final ServiceConfig config;
+
+  public ItemService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private ItemService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private ItemService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  ItemService with(RequestOptions newOptions) {
+    return new ItemService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public ItemService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** list a item using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(ItemListParams params) throws ChargebeeException {
+
+    return get("/items", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a item without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/items", null);
+  }
+
+  /** list a item using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public ItemListResponse list(ItemListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return ItemListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public ItemListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return ItemListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** create a item using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(ItemCreateParams params) throws ChargebeeException {
+
+    return post("/items", params != null ? params.toFormData() : null);
+  }
+
+  /** create a item using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/items", jsonPayload);
+  }
+
+  public ItemCreateResponse create(ItemCreateParams params) throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return ItemCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** delete a item (executes immediately) - returns raw Response. */
+  Response deleteRaw(String itemId) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/delete", "item-id", itemId);
+
+    return post(path, null);
+  }
+
+  public ItemDeleteResponse delete(String itemId) throws ChargebeeException {
+    Response response = deleteRaw(itemId);
+    return ItemDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a item (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String itemId) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}", "item-id", itemId);
+
+    return get(path, null);
+  }
+
+  public ItemRetrieveResponse retrieve(String itemId) throws ChargebeeException {
+    Response response = retrieveRaw(itemId);
+    return ItemRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** update a item (executes immediately) - returns raw Response. */
+  Response updateRaw(String itemId) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}", "item-id", itemId);
+
+    return post(path, null);
+  }
+
+  /** update a item using immutable params (executes immediately) - returns raw Response. */
+  Response updateRaw(String itemId, ItemUpdateParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}", "item-id", itemId);
+    return post(path, params.toFormData());
+  }
+
+  /** update a item using raw JSON payload (executes immediately) - returns raw Response. */
+  Response updateRaw(String itemId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}", "item-id", itemId);
+    return postJson(path, jsonPayload);
+  }
+
+  public ItemUpdateResponse update(String itemId, ItemUpdateParams params)
+      throws ChargebeeException {
+    Response response = updateRaw(itemId, params);
+    return ItemUpdateResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/MediaService.java b/src/main/java/com/chargebee/v4/services/MediaService.java
new file mode 100644
index 00000000..f990ff60
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/MediaService.java
@@ -0,0 +1,85 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.media.params.CreateMediaAndAttachToItemParams;
+
+import com.chargebee.v4.models.media.responses.CreateMediaAndAttachToItemResponse;
+
+public final class MediaService extends BaseService<MediaService> {
+
+  private final ServiceConfig config;
+
+  public MediaService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private MediaService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private MediaService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  MediaService with(RequestOptions newOptions) {
+    return new MediaService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public MediaService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** createMediaAndAttachToItem a media (executes immediately) - returns raw Response. */
+  Response createMediaAndAttachToItemRaw(String itemId) throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/media", "item-id", itemId);
+
+    return post(path, null);
+  }
+
+  /**
+   * createMediaAndAttachToItem a media using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response createMediaAndAttachToItemRaw(String itemId, CreateMediaAndAttachToItemParams params)
+      throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/media", "item-id", itemId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * createMediaAndAttachToItem a media using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response createMediaAndAttachToItemRaw(String itemId, String jsonPayload)
+      throws ChargebeeException {
+    String path = buildPathWithParams("/items/{item-id}/media", "item-id", itemId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CreateMediaAndAttachToItemResponse createMediaAndAttachToItem(
+      String itemId, CreateMediaAndAttachToItemParams params) throws ChargebeeException {
+    Response response = createMediaAndAttachToItemRaw(itemId, params);
+    return CreateMediaAndAttachToItemResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/NonSubscriptionService.java b/src/main/java/com/chargebee/v4/services/NonSubscriptionService.java
similarity index 86%
rename from src/main/java/com/chargebee/v4/core/services/NonSubscriptionService.java
rename to src/main/java/com/chargebee/v4/services/NonSubscriptionService.java
index 1ee102da..693e9454 100644
--- a/src/main/java/com/chargebee/v4/core/services/NonSubscriptionService.java
+++ b/src/main/java/com/chargebee/v4/services/NonSubscriptionService.java
@@ -5,15 +5,16 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.nonSubscription.params.NonSubscriptionProcessReceiptParams;
+import com.chargebee.v4.models.nonSubscription.params.NonSubscriptionProcessReceiptParams;
 
-import com.chargebee.v4.core.responses.nonSubscription.NonSubscriptionProcessReceiptResponse;
+import com.chargebee.v4.models.nonSubscription.responses.NonSubscriptionProcessReceiptResponse;
 
 public final class NonSubscriptionService extends BaseService<NonSubscriptionService> {
 
@@ -51,7 +52,7 @@ public NonSubscriptionService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** processReceipt a nonSubscription (executes immediately) - returns raw Response. */
-  Response processReceiptRaw(String nonSubscriptionAppId) throws Exception {
+  Response processReceiptRaw(String nonSubscriptionAppId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/non_subscriptions/{non-subscription-app-id}/one_time_purchase",
@@ -66,7 +67,8 @@ Response processReceiptRaw(String nonSubscriptionAppId) throws Exception {
    * Response.
    */
   Response processReceiptRaw(
-      String nonSubscriptionAppId, NonSubscriptionProcessReceiptParams params) throws Exception {
+      String nonSubscriptionAppId, NonSubscriptionProcessReceiptParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/non_subscriptions/{non-subscription-app-id}/one_time_purchase",
@@ -79,7 +81,8 @@ Response processReceiptRaw(
    * processReceipt a nonSubscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response processReceiptRaw(String nonSubscriptionAppId, String jsonPayload) throws Exception {
+  Response processReceiptRaw(String nonSubscriptionAppId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/non_subscriptions/{non-subscription-app-id}/one_time_purchase",
@@ -89,7 +92,8 @@ Response processReceiptRaw(String nonSubscriptionAppId, String jsonPayload) thro
   }
 
   public NonSubscriptionProcessReceiptResponse processReceipt(
-      String nonSubscriptionAppId, NonSubscriptionProcessReceiptParams params) throws Exception {
+      String nonSubscriptionAppId, NonSubscriptionProcessReceiptParams params)
+      throws ChargebeeException {
     Response response = processReceiptRaw(nonSubscriptionAppId, params);
     return NonSubscriptionProcessReceiptResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/core/services/OfferEventService.java b/src/main/java/com/chargebee/v4/services/OfferEventService.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/services/OfferEventService.java
rename to src/main/java/com/chargebee/v4/services/OfferEventService.java
index cb4cb9ee..7bcd66e3 100644
--- a/src/main/java/com/chargebee/v4/core/services/OfferEventService.java
+++ b/src/main/java/com/chargebee/v4/services/OfferEventService.java
@@ -5,15 +5,16 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.offerEvent.params.OfferEventOfferEventsParams;
+import com.chargebee.v4.models.offerEvent.params.OfferEventsParams;
 
-import com.chargebee.v4.core.responses.offerEvent.OfferEventOfferEventsResponse;
+import com.chargebee.v4.models.offerEvent.responses.OfferEventsResponse;
 
 public final class OfferEventService extends BaseService<OfferEventService> {
 
@@ -52,7 +53,7 @@ public OfferEventService withOptions(RequestOptions options) {
   /**
    * offerEvents a offerEvent using immutable params (executes immediately) - returns raw Response.
    */
-  Response offerEventsRaw(OfferEventOfferEventsParams params) throws Exception {
+  Response offerEventsRaw(OfferEventsParams params) throws ChargebeeException {
 
     return post("/offer_events", params != null ? params.toFormData() : null);
   }
@@ -60,15 +61,14 @@ Response offerEventsRaw(OfferEventOfferEventsParams params) throws Exception {
   /**
    * offerEvents a offerEvent using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response offerEventsRaw(String jsonPayload) throws Exception {
+  Response offerEventsRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/offer_events", jsonPayload);
   }
 
-  public OfferEventOfferEventsResponse offerEvents(OfferEventOfferEventsParams params)
-      throws Exception {
+  public OfferEventsResponse offerEvents(OfferEventsParams params) throws ChargebeeException {
     Response response = offerEventsRaw(params);
 
-    return OfferEventOfferEventsResponse.fromJson(response.getBodyAsString(), response);
+    return OfferEventsResponse.fromJson(response.getBodyAsString(), response);
   }
 }
diff --git a/src/main/java/com/chargebee/v4/services/OfferFulfillmentService.java b/src/main/java/com/chargebee/v4/services/OfferFulfillmentService.java
new file mode 100644
index 00000000..1b294ee3
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/OfferFulfillmentService.java
@@ -0,0 +1,146 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.offerFulfillment.params.OfferFulfillmentsParams;
+
+import com.chargebee.v4.models.offerFulfillment.params.OfferFulfillmentsUpdateParams;
+
+import com.chargebee.v4.models.offerFulfillment.responses.OfferFulfillmentsResponse;
+
+import com.chargebee.v4.models.offerFulfillment.responses.OfferFulfillmentsGetResponse;
+
+import com.chargebee.v4.models.offerFulfillment.responses.OfferFulfillmentsUpdateResponse;
+
+public final class OfferFulfillmentService extends BaseService<OfferFulfillmentService> {
+
+  private final ServiceConfig config;
+
+  public OfferFulfillmentService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private OfferFulfillmentService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private OfferFulfillmentService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  OfferFulfillmentService with(RequestOptions newOptions) {
+    return new OfferFulfillmentService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public OfferFulfillmentService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * offerFulfillments a offerFulfillment using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response offerFulfillmentsRaw(OfferFulfillmentsParams params) throws ChargebeeException {
+
+    return post("/offer_fulfillments", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * offerFulfillments a offerFulfillment using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response offerFulfillmentsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/offer_fulfillments", jsonPayload);
+  }
+
+  public OfferFulfillmentsResponse offerFulfillments(OfferFulfillmentsParams params)
+      throws ChargebeeException {
+    Response response = offerFulfillmentsRaw(params);
+
+    return OfferFulfillmentsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** offerFulfillmentsGet a offerFulfillment (executes immediately) - returns raw Response. */
+  Response offerFulfillmentsGetRaw(String offerFulfillmentId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/offer_fulfillments/{offer-fulfillment-id}",
+            "offer-fulfillment-id",
+            offerFulfillmentId);
+
+    return get(path, null);
+  }
+
+  public OfferFulfillmentsGetResponse offerFulfillmentsGet(String offerFulfillmentId)
+      throws ChargebeeException {
+    Response response = offerFulfillmentsGetRaw(offerFulfillmentId);
+    return OfferFulfillmentsGetResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** offerFulfillmentsUpdate a offerFulfillment (executes immediately) - returns raw Response. */
+  Response offerFulfillmentsUpdateRaw(String offerFulfillmentId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/offer_fulfillments/{offer-fulfillment-id}",
+            "offer-fulfillment-id",
+            offerFulfillmentId);
+
+    return post(path, null);
+  }
+
+  /**
+   * offerFulfillmentsUpdate a offerFulfillment using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response offerFulfillmentsUpdateRaw(
+      String offerFulfillmentId, OfferFulfillmentsUpdateParams params) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/offer_fulfillments/{offer-fulfillment-id}",
+            "offer-fulfillment-id",
+            offerFulfillmentId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * offerFulfillmentsUpdate a offerFulfillment using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response offerFulfillmentsUpdateRaw(String offerFulfillmentId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/offer_fulfillments/{offer-fulfillment-id}",
+            "offer-fulfillment-id",
+            offerFulfillmentId);
+    return postJson(path, jsonPayload);
+  }
+
+  public OfferFulfillmentsUpdateResponse offerFulfillmentsUpdate(
+      String offerFulfillmentId, OfferFulfillmentsUpdateParams params) throws ChargebeeException {
+    Response response = offerFulfillmentsUpdateRaw(offerFulfillmentId, params);
+    return OfferFulfillmentsUpdateResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/OmnichannelOneTimeOrderService.java b/src/main/java/com/chargebee/v4/services/OmnichannelOneTimeOrderService.java
similarity index 81%
rename from src/main/java/com/chargebee/v4/core/services/OmnichannelOneTimeOrderService.java
rename to src/main/java/com/chargebee/v4/services/OmnichannelOneTimeOrderService.java
index 0288bf8a..8709ffba 100644
--- a/src/main/java/com/chargebee/v4/core/services/OmnichannelOneTimeOrderService.java
+++ b/src/main/java/com/chargebee/v4/services/OmnichannelOneTimeOrderService.java
@@ -5,17 +5,18 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.omnichannelOneTimeOrder.params.OmnichannelOneTimeOrderListParams;
+import com.chargebee.v4.models.omnichannelOneTimeOrder.params.OmnichannelOneTimeOrderListParams;
 
-import com.chargebee.v4.core.responses.omnichannelOneTimeOrder.OmnichannelOneTimeOrderListResponse;
+import com.chargebee.v4.models.omnichannelOneTimeOrder.responses.OmnichannelOneTimeOrderListResponse;
 
-import com.chargebee.v4.core.responses.omnichannelOneTimeOrder.OmnichannelOneTimeOrderRetrieveResponse;
+import com.chargebee.v4.models.omnichannelOneTimeOrder.responses.OmnichannelOneTimeOrderRetrieveResponse;
 
 public final class OmnichannelOneTimeOrderService
     extends BaseService<OmnichannelOneTimeOrderService> {
@@ -57,7 +58,7 @@ public OmnichannelOneTimeOrderService withOptions(RequestOptions options) {
    * list a omnichannelOneTimeOrder using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response listRaw(OmnichannelOneTimeOrderListParams params) throws Exception {
+  Response listRaw(OmnichannelOneTimeOrderListParams params) throws ChargebeeException {
 
     return get("/omnichannel_one_time_orders", params != null ? params.toQueryParams() : null);
   }
@@ -65,7 +66,7 @@ Response listRaw(OmnichannelOneTimeOrderListParams params) throws Exception {
   /**
    * list a omnichannelOneTimeOrder without params (executes immediately) - returns raw Response.
    */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/omnichannel_one_time_orders", null);
   }
@@ -74,27 +75,27 @@ Response listRaw() throws Exception {
    * list a omnichannelOneTimeOrder using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public OmnichannelOneTimeOrderListResponse list(OmnichannelOneTimeOrderListParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = listRaw(params);
 
     return OmnichannelOneTimeOrderListResponse.fromJson(
         response.getBodyAsString(), this, params, response);
   }
 
-  public OmnichannelOneTimeOrderListResponse list() throws Exception {
+  public OmnichannelOneTimeOrderListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return OmnichannelOneTimeOrderListResponse.fromJson(
         response.getBodyAsString(), this, null, response);
   }
 
   /** retrieve a omnichannelOneTimeOrder (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String omnichannelOneTimeOrderId) throws Exception {
+  Response retrieveRaw(String omnichannelOneTimeOrderId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/omnichannel_one_time_orders/{omnichannel-one-time-order-id}",
@@ -105,7 +106,7 @@ Response retrieveRaw(String omnichannelOneTimeOrderId) throws Exception {
   }
 
   public OmnichannelOneTimeOrderRetrieveResponse retrieve(String omnichannelOneTimeOrderId)
-      throws Exception {
+      throws ChargebeeException {
     Response response = retrieveRaw(omnichannelOneTimeOrderId);
     return OmnichannelOneTimeOrderRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/services/OmnichannelSubscriptionItemService.java b/src/main/java/com/chargebee/v4/services/OmnichannelSubscriptionItemService.java
new file mode 100644
index 00000000..3b5d9929
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/OmnichannelSubscriptionItemService.java
@@ -0,0 +1,117 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.omnichannelSubscriptionItem.params.OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams;
+
+import com.chargebee.v4.models.omnichannelSubscriptionItem.responses.OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse;
+
+public final class OmnichannelSubscriptionItemService
+    extends BaseService<OmnichannelSubscriptionItemService> {
+
+  private final ServiceConfig config;
+
+  public OmnichannelSubscriptionItemService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private OmnichannelSubscriptionItemService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private OmnichannelSubscriptionItemService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  OmnichannelSubscriptionItemService with(RequestOptions newOptions) {
+    return new OmnichannelSubscriptionItemService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public OmnichannelSubscriptionItemService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * listOmniSubscriptionItemScheduleChanges a omnichannelSubscriptionItem using immutable params
+   * (executes immediately) - returns raw Response.
+   */
+  Response listOmniSubscriptionItemScheduleChangesRaw(
+      String omnichannelSubscriptionItemId,
+      OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/omnichannel_subscription_items/{omnichannel-subscription-item-id}/scheduled_changes",
+            "omnichannel-subscription-item-id",
+            omnichannelSubscriptionItemId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * listOmniSubscriptionItemScheduleChanges a omnichannelSubscriptionItem without params (executes
+   * immediately) - returns raw Response.
+   */
+  Response listOmniSubscriptionItemScheduleChangesRaw(String omnichannelSubscriptionItemId)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/omnichannel_subscription_items/{omnichannel-subscription-item-id}/scheduled_changes",
+            "omnichannel-subscription-item-id",
+            omnichannelSubscriptionItemId);
+    return get(path, null);
+  }
+
+  /**
+   * listOmniSubscriptionItemScheduleChanges a omnichannelSubscriptionItem using raw JSON payload
+   * (executes immediately) - returns raw Response.
+   */
+  Response listOmniSubscriptionItemScheduleChangesRaw(
+      String omnichannelSubscriptionItemId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/omnichannel_subscription_items/{omnichannel-subscription-item-id}/scheduled_changes",
+            "omnichannel-subscription-item-id",
+            omnichannelSubscriptionItemId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse
+      listOmniSubscriptionItemScheduleChanges(
+          String omnichannelSubscriptionItemId,
+          OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesParams params)
+          throws ChargebeeException {
+    Response response =
+        listOmniSubscriptionItemScheduleChangesRaw(omnichannelSubscriptionItemId, params);
+    return OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse.fromJson(
+        response.getBodyAsString(), this, params, omnichannelSubscriptionItemId, response);
+  }
+
+  public OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse
+      listOmniSubscriptionItemScheduleChanges(String omnichannelSubscriptionItemId)
+          throws ChargebeeException {
+    Response response = listOmniSubscriptionItemScheduleChangesRaw(omnichannelSubscriptionItemId);
+    return OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse.fromJson(
+        response.getBodyAsString(), this, null, omnichannelSubscriptionItemId, response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/OmnichannelSubscriptionService.java b/src/main/java/com/chargebee/v4/services/OmnichannelSubscriptionService.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/services/OmnichannelSubscriptionService.java
rename to src/main/java/com/chargebee/v4/services/OmnichannelSubscriptionService.java
index 8626576c..533f68bd 100644
--- a/src/main/java/com/chargebee/v4/core/services/OmnichannelSubscriptionService.java
+++ b/src/main/java/com/chargebee/v4/services/OmnichannelSubscriptionService.java
@@ -5,25 +5,26 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.params.OmnichannelSubscriptionMoveParams;
+import com.chargebee.v4.models.omnichannelSubscription.params.OmnichannelSubscriptionMoveParams;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.params.OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams;
+import com.chargebee.v4.models.omnichannelSubscription.params.OmnichannelTransactionsForOmnichannelSubscriptionParams;
 
-import com.chargebee.v4.core.models.omnichannelSubscription.params.OmnichannelSubscriptionListParams;
+import com.chargebee.v4.models.omnichannelSubscription.params.OmnichannelSubscriptionListParams;
 
-import com.chargebee.v4.core.responses.omnichannelSubscription.OmnichannelSubscriptionMoveResponse;
+import com.chargebee.v4.models.omnichannelSubscription.responses.OmnichannelSubscriptionMoveResponse;
 
-import com.chargebee.v4.core.responses.omnichannelSubscription.OmnichannelSubscriptionRetrieveResponse;
+import com.chargebee.v4.models.omnichannelSubscription.responses.OmnichannelSubscriptionRetrieveResponse;
 
-import com.chargebee.v4.core.responses.omnichannelSubscription.OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse;
+import com.chargebee.v4.models.omnichannelSubscription.responses.OmnichannelTransactionsForOmnichannelSubscriptionResponse;
 
-import com.chargebee.v4.core.responses.omnichannelSubscription.OmnichannelSubscriptionListResponse;
+import com.chargebee.v4.models.omnichannelSubscription.responses.OmnichannelSubscriptionListResponse;
 
 public final class OmnichannelSubscriptionService
     extends BaseService<OmnichannelSubscriptionService> {
@@ -62,7 +63,7 @@ public OmnichannelSubscriptionService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** move a omnichannelSubscription (executes immediately) - returns raw Response. */
-  Response moveRaw(String omnichannelSubscriptionId) throws Exception {
+  Response moveRaw(String omnichannelSubscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/omnichannel_subscriptions/{omnichannel-subscription-id}/move",
@@ -77,7 +78,7 @@ Response moveRaw(String omnichannelSubscriptionId) throws Exception {
    * Response.
    */
   Response moveRaw(String omnichannelSubscriptionId, OmnichannelSubscriptionMoveParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/omnichannel_subscriptions/{omnichannel-subscription-id}/move",
@@ -90,7 +91,7 @@ Response moveRaw(String omnichannelSubscriptionId, OmnichannelSubscriptionMovePa
    * move a omnichannelSubscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response moveRaw(String omnichannelSubscriptionId, String jsonPayload) throws Exception {
+  Response moveRaw(String omnichannelSubscriptionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/omnichannel_subscriptions/{omnichannel-subscription-id}/move",
@@ -100,13 +101,14 @@ Response moveRaw(String omnichannelSubscriptionId, String jsonPayload) throws Ex
   }
 
   public OmnichannelSubscriptionMoveResponse move(
-      String omnichannelSubscriptionId, OmnichannelSubscriptionMoveParams params) throws Exception {
+      String omnichannelSubscriptionId, OmnichannelSubscriptionMoveParams params)
+      throws ChargebeeException {
     Response response = moveRaw(omnichannelSubscriptionId, params);
     return OmnichannelSubscriptionMoveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** retrieve a omnichannelSubscription (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String omnichannelSubscriptionId) throws Exception {
+  Response retrieveRaw(String omnichannelSubscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/omnichannel_subscriptions/{omnichannel-subscription-id}",
@@ -117,7 +119,7 @@ Response retrieveRaw(String omnichannelSubscriptionId) throws Exception {
   }
 
   public OmnichannelSubscriptionRetrieveResponse retrieve(String omnichannelSubscriptionId)
-      throws Exception {
+      throws ChargebeeException {
     Response response = retrieveRaw(omnichannelSubscriptionId);
     return OmnichannelSubscriptionRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
@@ -128,8 +130,8 @@ public OmnichannelSubscriptionRetrieveResponse retrieve(String omnichannelSubscr
    */
   Response omnichannelTransactionsForOmnichannelSubscriptionRaw(
       String omnichannelSubscriptionId,
-      OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams params)
-      throws Exception {
+      OmnichannelTransactionsForOmnichannelSubscriptionParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/omnichannel_subscriptions/{omnichannel-subscription-id}/omnichannel_transactions",
@@ -143,7 +145,7 @@ Response omnichannelTransactionsForOmnichannelSubscriptionRaw(
    * (executes immediately) - returns raw Response.
    */
   Response omnichannelTransactionsForOmnichannelSubscriptionRaw(String omnichannelSubscriptionId)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/omnichannel_subscriptions/{omnichannel-subscription-id}/omnichannel_transactions",
@@ -157,7 +159,7 @@ Response omnichannelTransactionsForOmnichannelSubscriptionRaw(String omnichannel
    * payload (executes immediately) - returns raw Response.
    */
   Response omnichannelTransactionsForOmnichannelSubscriptionRaw(
-      String omnichannelSubscriptionId, String jsonPayload) throws Exception {
+      String omnichannelSubscriptionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/omnichannel_subscriptions/{omnichannel-subscription-id}/omnichannel_transactions",
@@ -166,31 +168,31 @@ Response omnichannelTransactionsForOmnichannelSubscriptionRaw(
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse
+  public OmnichannelTransactionsForOmnichannelSubscriptionResponse
       omnichannelTransactionsForOmnichannelSubscription(
           String omnichannelSubscriptionId,
-          OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionParams params)
-          throws Exception {
+          OmnichannelTransactionsForOmnichannelSubscriptionParams params)
+          throws ChargebeeException {
     Response response =
         omnichannelTransactionsForOmnichannelSubscriptionRaw(omnichannelSubscriptionId, params);
-    return OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse
-        .fromJson(response.getBodyAsString(), this, params, omnichannelSubscriptionId, response);
+    return OmnichannelTransactionsForOmnichannelSubscriptionResponse.fromJson(
+        response.getBodyAsString(), this, params, omnichannelSubscriptionId, response);
   }
 
-  public OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse
+  public OmnichannelTransactionsForOmnichannelSubscriptionResponse
       omnichannelTransactionsForOmnichannelSubscription(String omnichannelSubscriptionId)
-          throws Exception {
+          throws ChargebeeException {
     Response response =
         omnichannelTransactionsForOmnichannelSubscriptionRaw(omnichannelSubscriptionId);
-    return OmnichannelSubscriptionOmnichannelTransactionsForOmnichannelSubscriptionResponse
-        .fromJson(response.getBodyAsString(), this, null, omnichannelSubscriptionId, response);
+    return OmnichannelTransactionsForOmnichannelSubscriptionResponse.fromJson(
+        response.getBodyAsString(), this, null, omnichannelSubscriptionId, response);
   }
 
   /**
    * list a omnichannelSubscription using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response listRaw(OmnichannelSubscriptionListParams params) throws Exception {
+  Response listRaw(OmnichannelSubscriptionListParams params) throws ChargebeeException {
 
     return get("/omnichannel_subscriptions", params != null ? params.toQueryParams() : null);
   }
@@ -198,7 +200,7 @@ Response listRaw(OmnichannelSubscriptionListParams params) throws Exception {
   /**
    * list a omnichannelSubscription without params (executes immediately) - returns raw Response.
    */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/omnichannel_subscriptions", null);
   }
@@ -207,20 +209,20 @@ Response listRaw() throws Exception {
    * list a omnichannelSubscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public OmnichannelSubscriptionListResponse list(OmnichannelSubscriptionListParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = listRaw(params);
 
     return OmnichannelSubscriptionListResponse.fromJson(
         response.getBodyAsString(), this, params, response);
   }
 
-  public OmnichannelSubscriptionListResponse list() throws Exception {
+  public OmnichannelSubscriptionListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return OmnichannelSubscriptionListResponse.fromJson(
         response.getBodyAsString(), this, null, response);
diff --git a/src/main/java/com/chargebee/v4/services/OrderService.java b/src/main/java/com/chargebee/v4/services/OrderService.java
new file mode 100644
index 00000000..03ea47e2
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/OrderService.java
@@ -0,0 +1,367 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.order.params.OrderListParams;
+
+import com.chargebee.v4.models.order.params.OrderCreateParams;
+
+import com.chargebee.v4.models.order.params.ImportOrderParams;
+
+import com.chargebee.v4.models.order.params.OrderResendParams;
+
+import com.chargebee.v4.models.order.params.OrderReopenParams;
+
+import com.chargebee.v4.models.order.params.OrdersForInvoiceParams;
+
+import com.chargebee.v4.models.order.params.OrderCancelParams;
+
+import com.chargebee.v4.models.order.params.OrderUpdateParams;
+
+import com.chargebee.v4.models.order.params.OrderCreateRefundableCreditNoteParams;
+
+import com.chargebee.v4.models.order.responses.OrderListResponse;
+
+import com.chargebee.v4.models.order.responses.OrderCreateResponse;
+
+import com.chargebee.v4.models.order.responses.ImportOrderResponse;
+
+import com.chargebee.v4.models.order.responses.AssignOrderNumberResponse;
+
+import com.chargebee.v4.models.order.responses.OrderResendResponse;
+
+import com.chargebee.v4.models.order.responses.OrderReopenResponse;
+
+import com.chargebee.v4.models.order.responses.OrdersForInvoiceResponse;
+
+import com.chargebee.v4.models.order.responses.OrderCancelResponse;
+
+import com.chargebee.v4.models.order.responses.OrderRetrieveResponse;
+
+import com.chargebee.v4.models.order.responses.OrderUpdateResponse;
+
+import com.chargebee.v4.models.order.responses.OrderDeleteResponse;
+
+import com.chargebee.v4.models.order.responses.OrderCreateRefundableCreditNoteResponse;
+
+public final class OrderService extends BaseService<OrderService> {
+
+  private final ServiceConfig config;
+
+  public OrderService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private OrderService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private OrderService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  OrderService with(RequestOptions newOptions) {
+    return new OrderService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public OrderService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** list a order using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(OrderListParams params) throws ChargebeeException {
+
+    return get("/orders", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a order without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/orders", null);
+  }
+
+  /** list a order using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public OrderListResponse list(OrderListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return OrderListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public OrderListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return OrderListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** create a order using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(OrderCreateParams params) throws ChargebeeException {
+
+    return post("/orders", params != null ? params.toFormData() : null);
+  }
+
+  /** create a order using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/orders", jsonPayload);
+  }
+
+  public OrderCreateResponse create(OrderCreateParams params) throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return OrderCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** importOrder a order using immutable params (executes immediately) - returns raw Response. */
+  Response importOrderRaw(ImportOrderParams params) throws ChargebeeException {
+
+    return post("/orders/import_order", params != null ? params.toFormData() : null);
+  }
+
+  /** importOrder a order using raw JSON payload (executes immediately) - returns raw Response. */
+  Response importOrderRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/orders/import_order", jsonPayload);
+  }
+
+  public ImportOrderResponse importOrder(ImportOrderParams params) throws ChargebeeException {
+    Response response = importOrderRaw(params);
+
+    return ImportOrderResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** assignOrderNumber a order (executes immediately) - returns raw Response. */
+  Response assignOrderNumberRaw(String orderId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/orders/{order-id}/assign_order_number", "order-id", orderId);
+
+    return post(path, null);
+  }
+
+  public AssignOrderNumberResponse assignOrderNumber(String orderId) throws ChargebeeException {
+    Response response = assignOrderNumberRaw(orderId);
+    return AssignOrderNumberResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** resend a order (executes immediately) - returns raw Response. */
+  Response resendRaw(String orderId) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}/resend", "order-id", orderId);
+
+    return post(path, null);
+  }
+
+  /** resend a order using immutable params (executes immediately) - returns raw Response. */
+  Response resendRaw(String orderId, OrderResendParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}/resend", "order-id", orderId);
+    return post(path, params.toFormData());
+  }
+
+  /** resend a order using raw JSON payload (executes immediately) - returns raw Response. */
+  Response resendRaw(String orderId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}/resend", "order-id", orderId);
+    return postJson(path, jsonPayload);
+  }
+
+  public OrderResendResponse resend(String orderId, OrderResendParams params)
+      throws ChargebeeException {
+    Response response = resendRaw(orderId, params);
+    return OrderResendResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** reopen a order (executes immediately) - returns raw Response. */
+  Response reopenRaw(String orderId) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}/reopen", "order-id", orderId);
+
+    return post(path, null);
+  }
+
+  /** reopen a order using immutable params (executes immediately) - returns raw Response. */
+  Response reopenRaw(String orderId, OrderReopenParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}/reopen", "order-id", orderId);
+    return post(path, params.toFormData());
+  }
+
+  /** reopen a order using raw JSON payload (executes immediately) - returns raw Response. */
+  Response reopenRaw(String orderId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}/reopen", "order-id", orderId);
+    return postJson(path, jsonPayload);
+  }
+
+  public OrderReopenResponse reopen(String orderId, OrderReopenParams params)
+      throws ChargebeeException {
+    Response response = reopenRaw(orderId, params);
+    return OrderReopenResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * ordersForInvoice a order using immutable params (executes immediately) - returns raw Response.
+   */
+  Response ordersForInvoiceRaw(String invoiceId, OrdersForInvoiceParams params)
+      throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/orders", "invoice-id", invoiceId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /** ordersForInvoice a order without params (executes immediately) - returns raw Response. */
+  Response ordersForInvoiceRaw(String invoiceId) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/orders", "invoice-id", invoiceId);
+    return get(path, null);
+  }
+
+  /**
+   * ordersForInvoice a order using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response ordersForInvoiceRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/orders", "invoice-id", invoiceId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public OrdersForInvoiceResponse ordersForInvoice(String invoiceId, OrdersForInvoiceParams params)
+      throws ChargebeeException {
+    Response response = ordersForInvoiceRaw(invoiceId, params);
+    return OrdersForInvoiceResponse.fromJson(
+        response.getBodyAsString(), this, params, invoiceId, response);
+  }
+
+  public OrdersForInvoiceResponse ordersForInvoice(String invoiceId) throws ChargebeeException {
+    Response response = ordersForInvoiceRaw(invoiceId);
+    return OrdersForInvoiceResponse.fromJson(
+        response.getBodyAsString(), this, null, invoiceId, response);
+  }
+
+  /** cancel a order (executes immediately) - returns raw Response. */
+  Response cancelRaw(String orderId) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}/cancel", "order-id", orderId);
+
+    return post(path, null);
+  }
+
+  /** cancel a order using immutable params (executes immediately) - returns raw Response. */
+  Response cancelRaw(String orderId, OrderCancelParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}/cancel", "order-id", orderId);
+    return post(path, params.toFormData());
+  }
+
+  /** cancel a order using raw JSON payload (executes immediately) - returns raw Response. */
+  Response cancelRaw(String orderId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}/cancel", "order-id", orderId);
+    return postJson(path, jsonPayload);
+  }
+
+  public OrderCancelResponse cancel(String orderId, OrderCancelParams params)
+      throws ChargebeeException {
+    Response response = cancelRaw(orderId, params);
+    return OrderCancelResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a order (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String orderId) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}", "order-id", orderId);
+
+    return get(path, null);
+  }
+
+  public OrderRetrieveResponse retrieve(String orderId) throws ChargebeeException {
+    Response response = retrieveRaw(orderId);
+    return OrderRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** update a order (executes immediately) - returns raw Response. */
+  Response updateRaw(String orderId) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}", "order-id", orderId);
+
+    return post(path, null);
+  }
+
+  /** update a order using immutable params (executes immediately) - returns raw Response. */
+  Response updateRaw(String orderId, OrderUpdateParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}", "order-id", orderId);
+    return post(path, params.toFormData());
+  }
+
+  /** update a order using raw JSON payload (executes immediately) - returns raw Response. */
+  Response updateRaw(String orderId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}", "order-id", orderId);
+    return postJson(path, jsonPayload);
+  }
+
+  public OrderUpdateResponse update(String orderId, OrderUpdateParams params)
+      throws ChargebeeException {
+    Response response = updateRaw(orderId, params);
+    return OrderUpdateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** delete a order (executes immediately) - returns raw Response. */
+  Response deleteRaw(String orderId) throws ChargebeeException {
+    String path = buildPathWithParams("/orders/{order-id}/delete", "order-id", orderId);
+
+    return post(path, null);
+  }
+
+  public OrderDeleteResponse delete(String orderId) throws ChargebeeException {
+    Response response = deleteRaw(orderId);
+    return OrderDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** createRefundableCreditNote a order (executes immediately) - returns raw Response. */
+  Response createRefundableCreditNoteRaw(String orderId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/orders/{order-id}/create_refundable_credit_note", "order-id", orderId);
+
+    return post(path, null);
+  }
+
+  /**
+   * createRefundableCreditNote a order using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response createRefundableCreditNoteRaw(
+      String orderId, OrderCreateRefundableCreditNoteParams params) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/orders/{order-id}/create_refundable_credit_note", "order-id", orderId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * createRefundableCreditNote a order using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response createRefundableCreditNoteRaw(String orderId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/orders/{order-id}/create_refundable_credit_note", "order-id", orderId);
+    return postJson(path, jsonPayload);
+  }
+
+  public OrderCreateRefundableCreditNoteResponse createRefundableCreditNote(
+      String orderId, OrderCreateRefundableCreditNoteParams params) throws ChargebeeException {
+    Response response = createRefundableCreditNoteRaw(orderId, params);
+    return OrderCreateRefundableCreditNoteResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/PaymentIntentService.java b/src/main/java/com/chargebee/v4/services/PaymentIntentService.java
similarity index 78%
rename from src/main/java/com/chargebee/v4/core/services/PaymentIntentService.java
rename to src/main/java/com/chargebee/v4/services/PaymentIntentService.java
index fce57217..ebbe8a0b 100644
--- a/src/main/java/com/chargebee/v4/core/services/PaymentIntentService.java
+++ b/src/main/java/com/chargebee/v4/services/PaymentIntentService.java
@@ -5,21 +5,22 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.paymentIntent.params.PaymentIntentUpdateParams;
+import com.chargebee.v4.models.paymentIntent.params.PaymentIntentUpdateParams;
 
-import com.chargebee.v4.core.models.paymentIntent.params.PaymentIntentCreateParams;
+import com.chargebee.v4.models.paymentIntent.params.PaymentIntentCreateParams;
 
-import com.chargebee.v4.core.responses.paymentIntent.PaymentIntentRetrieveResponse;
+import com.chargebee.v4.models.paymentIntent.responses.PaymentIntentRetrieveResponse;
 
-import com.chargebee.v4.core.responses.paymentIntent.PaymentIntentUpdateResponse;
+import com.chargebee.v4.models.paymentIntent.responses.PaymentIntentUpdateResponse;
 
-import com.chargebee.v4.core.responses.paymentIntent.PaymentIntentCreateResponse;
+import com.chargebee.v4.models.paymentIntent.responses.PaymentIntentCreateResponse;
 
 public final class PaymentIntentService extends BaseService<PaymentIntentService> {
 
@@ -57,7 +58,7 @@ public PaymentIntentService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** retrieve a paymentIntent (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String paymentIntentId) throws Exception {
+  Response retrieveRaw(String paymentIntentId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/payment_intents/{payment-intent-id}", "payment-intent-id", paymentIntentId);
@@ -65,13 +66,13 @@ Response retrieveRaw(String paymentIntentId) throws Exception {
     return get(path, null);
   }
 
-  public PaymentIntentRetrieveResponse retrieve(String paymentIntentId) throws Exception {
+  public PaymentIntentRetrieveResponse retrieve(String paymentIntentId) throws ChargebeeException {
     Response response = retrieveRaw(paymentIntentId);
     return PaymentIntentRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a paymentIntent (executes immediately) - returns raw Response. */
-  Response updateRaw(String paymentIntentId) throws Exception {
+  Response updateRaw(String paymentIntentId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/payment_intents/{payment-intent-id}", "payment-intent-id", paymentIntentId);
@@ -82,7 +83,8 @@ Response updateRaw(String paymentIntentId) throws Exception {
   /**
    * update a paymentIntent using immutable params (executes immediately) - returns raw Response.
    */
-  Response updateRaw(String paymentIntentId, PaymentIntentUpdateParams params) throws Exception {
+  Response updateRaw(String paymentIntentId, PaymentIntentUpdateParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/payment_intents/{payment-intent-id}", "payment-intent-id", paymentIntentId);
@@ -92,7 +94,7 @@ Response updateRaw(String paymentIntentId, PaymentIntentUpdateParams params) thr
   /**
    * update a paymentIntent using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response updateRaw(String paymentIntentId, String jsonPayload) throws Exception {
+  Response updateRaw(String paymentIntentId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/payment_intents/{payment-intent-id}", "payment-intent-id", paymentIntentId);
@@ -100,7 +102,7 @@ Response updateRaw(String paymentIntentId, String jsonPayload) throws Exception
   }
 
   public PaymentIntentUpdateResponse update(
-      String paymentIntentId, PaymentIntentUpdateParams params) throws Exception {
+      String paymentIntentId, PaymentIntentUpdateParams params) throws ChargebeeException {
     Response response = updateRaw(paymentIntentId, params);
     return PaymentIntentUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
@@ -108,7 +110,7 @@ public PaymentIntentUpdateResponse update(
   /**
    * create a paymentIntent using immutable params (executes immediately) - returns raw Response.
    */
-  Response createRaw(PaymentIntentCreateParams params) throws Exception {
+  Response createRaw(PaymentIntentCreateParams params) throws ChargebeeException {
 
     return post("/payment_intents", params != null ? params.toFormData() : null);
   }
@@ -116,12 +118,13 @@ Response createRaw(PaymentIntentCreateParams params) throws Exception {
   /**
    * create a paymentIntent using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/payment_intents", jsonPayload);
   }
 
-  public PaymentIntentCreateResponse create(PaymentIntentCreateParams params) throws Exception {
+  public PaymentIntentCreateResponse create(PaymentIntentCreateParams params)
+      throws ChargebeeException {
     Response response = createRaw(params);
 
     return PaymentIntentCreateResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/core/services/PaymentScheduleSchemeService.java b/src/main/java/com/chargebee/v4/services/PaymentScheduleSchemeService.java
similarity index 79%
rename from src/main/java/com/chargebee/v4/core/services/PaymentScheduleSchemeService.java
rename to src/main/java/com/chargebee/v4/services/PaymentScheduleSchemeService.java
index b935db38..a69eea11 100644
--- a/src/main/java/com/chargebee/v4/core/services/PaymentScheduleSchemeService.java
+++ b/src/main/java/com/chargebee/v4/services/PaymentScheduleSchemeService.java
@@ -5,19 +5,20 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.paymentScheduleScheme.params.PaymentScheduleSchemeCreateParams;
+import com.chargebee.v4.models.paymentScheduleScheme.params.PaymentScheduleSchemeCreateParams;
 
-import com.chargebee.v4.core.responses.paymentScheduleScheme.PaymentScheduleSchemeRetrieveResponse;
+import com.chargebee.v4.models.paymentScheduleScheme.responses.PaymentScheduleSchemeRetrieveResponse;
 
-import com.chargebee.v4.core.responses.paymentScheduleScheme.PaymentScheduleSchemeCreateResponse;
+import com.chargebee.v4.models.paymentScheduleScheme.responses.PaymentScheduleSchemeCreateResponse;
 
-import com.chargebee.v4.core.responses.paymentScheduleScheme.PaymentScheduleSchemeDeleteResponse;
+import com.chargebee.v4.models.paymentScheduleScheme.responses.PaymentScheduleSchemeDeleteResponse;
 
 public final class PaymentScheduleSchemeService extends BaseService<PaymentScheduleSchemeService> {
 
@@ -55,7 +56,7 @@ public PaymentScheduleSchemeService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** retrieve a paymentScheduleScheme (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String paymentScheduleSchemeId) throws Exception {
+  Response retrieveRaw(String paymentScheduleSchemeId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/payment_schedule_schemes/{payment-schedule-scheme-id}",
@@ -66,7 +67,7 @@ Response retrieveRaw(String paymentScheduleSchemeId) throws Exception {
   }
 
   public PaymentScheduleSchemeRetrieveResponse retrieve(String paymentScheduleSchemeId)
-      throws Exception {
+      throws ChargebeeException {
     Response response = retrieveRaw(paymentScheduleSchemeId);
     return PaymentScheduleSchemeRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
@@ -75,7 +76,7 @@ public PaymentScheduleSchemeRetrieveResponse retrieve(String paymentScheduleSche
    * create a paymentScheduleScheme using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response createRaw(PaymentScheduleSchemeCreateParams params) throws Exception {
+  Response createRaw(PaymentScheduleSchemeCreateParams params) throws ChargebeeException {
 
     return post("/payment_schedule_schemes", params != null ? params.toFormData() : null);
   }
@@ -84,20 +85,20 @@ Response createRaw(PaymentScheduleSchemeCreateParams params) throws Exception {
    * create a paymentScheduleScheme using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/payment_schedule_schemes", jsonPayload);
   }
 
   public PaymentScheduleSchemeCreateResponse create(PaymentScheduleSchemeCreateParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = createRaw(params);
 
     return PaymentScheduleSchemeCreateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** delete a paymentScheduleScheme (executes immediately) - returns raw Response. */
-  Response deleteRaw(String paymentScheduleSchemeId) throws Exception {
+  Response deleteRaw(String paymentScheduleSchemeId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/payment_schedule_schemes/{payment-schedule-scheme-id}/delete",
@@ -108,7 +109,7 @@ Response deleteRaw(String paymentScheduleSchemeId) throws Exception {
   }
 
   public PaymentScheduleSchemeDeleteResponse delete(String paymentScheduleSchemeId)
-      throws Exception {
+      throws ChargebeeException {
     Response response = deleteRaw(paymentScheduleSchemeId);
     return PaymentScheduleSchemeDeleteResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/services/PaymentSourceService.java b/src/main/java/com/chargebee/v4/services/PaymentSourceService.java
new file mode 100644
index 00000000..463e1eeb
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/PaymentSourceService.java
@@ -0,0 +1,626 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.paymentSource.params.PaymentSourceCreateUsingPermanentTokenParams;
+
+import com.chargebee.v4.models.paymentSource.params.PaymentSourceCreateCardParams;
+
+import com.chargebee.v4.models.paymentSource.params.PaymentSourceVerifyBankAccountParams;
+
+import com.chargebee.v4.models.paymentSource.params.PaymentSourceListParams;
+
+import com.chargebee.v4.models.paymentSource.params.ExportPaymentSourceParams;
+
+import com.chargebee.v4.models.paymentSource.params.PaymentSourceCreateUsingPaymentIntentParams;
+
+import com.chargebee.v4.models.paymentSource.params.CreateVoucherPaymentSourceParams;
+
+import com.chargebee.v4.models.paymentSource.params.PaymentSourceCreateUsingTempTokenParams;
+
+import com.chargebee.v4.models.paymentSource.params.PaymentSourceUpdateCardParams;
+
+import com.chargebee.v4.models.paymentSource.params.PaymentSourceSwitchGatewayAccountParams;
+
+import com.chargebee.v4.models.paymentSource.params.PaymentSourceCreateUsingTokenParams;
+
+import com.chargebee.v4.models.paymentSource.params.PaymentSourceCreateBankAccountParams;
+
+import com.chargebee.v4.models.paymentSource.params.PaymentSourceUpdateBankAccountParams;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceCreateUsingPermanentTokenResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceDeleteResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceCreateCardResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceVerifyBankAccountResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceListResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.ExportPaymentSourceResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceCreateUsingPaymentIntentResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceAgreementPdfResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceRetrieveResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.CreateVoucherPaymentSourceResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceCreateUsingTempTokenResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceUpdateCardResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceSwitchGatewayAccountResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceCreateUsingTokenResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceDeleteLocalResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceCreateBankAccountResponse;
+
+import com.chargebee.v4.models.paymentSource.responses.PaymentSourceUpdateBankAccountResponse;
+
+public final class PaymentSourceService extends BaseService<PaymentSourceService> {
+
+  private final ServiceConfig config;
+
+  public PaymentSourceService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private PaymentSourceService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private PaymentSourceService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  PaymentSourceService with(RequestOptions newOptions) {
+    return new PaymentSourceService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public PaymentSourceService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * createUsingPermanentToken a paymentSource using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response createUsingPermanentTokenRaw(PaymentSourceCreateUsingPermanentTokenParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/payment_sources/create_using_permanent_token",
+        params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createUsingPermanentToken a paymentSource using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response createUsingPermanentTokenRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/payment_sources/create_using_permanent_token", jsonPayload);
+  }
+
+  public PaymentSourceCreateUsingPermanentTokenResponse createUsingPermanentToken(
+      PaymentSourceCreateUsingPermanentTokenParams params) throws ChargebeeException {
+    Response response = createUsingPermanentTokenRaw(params);
+
+    return PaymentSourceCreateUsingPermanentTokenResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /** delete a paymentSource (executes immediately) - returns raw Response. */
+  Response deleteRaw(String custPaymentSourceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/delete",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+
+    return post(path, null);
+  }
+
+  public PaymentSourceDeleteResponse delete(String custPaymentSourceId) throws ChargebeeException {
+    Response response = deleteRaw(custPaymentSourceId);
+    return PaymentSourceDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createCard a paymentSource using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response createCardRaw(PaymentSourceCreateCardParams params) throws ChargebeeException {
+
+    return post("/payment_sources/create_card", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createCard a paymentSource using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response createCardRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/payment_sources/create_card", jsonPayload);
+  }
+
+  public PaymentSourceCreateCardResponse createCard(PaymentSourceCreateCardParams params)
+      throws ChargebeeException {
+    Response response = createCardRaw(params);
+
+    return PaymentSourceCreateCardResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** verifyBankAccount a paymentSource (executes immediately) - returns raw Response. */
+  Response verifyBankAccountRaw(String custPaymentSourceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/verify_bank_account",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * verifyBankAccount a paymentSource using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response verifyBankAccountRaw(
+      String custPaymentSourceId, PaymentSourceVerifyBankAccountParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/verify_bank_account",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * verifyBankAccount a paymentSource using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response verifyBankAccountRaw(String custPaymentSourceId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/verify_bank_account",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public PaymentSourceVerifyBankAccountResponse verifyBankAccount(
+      String custPaymentSourceId, PaymentSourceVerifyBankAccountParams params)
+      throws ChargebeeException {
+    Response response = verifyBankAccountRaw(custPaymentSourceId, params);
+    return PaymentSourceVerifyBankAccountResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** list a paymentSource using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(PaymentSourceListParams params) throws ChargebeeException {
+
+    return get("/payment_sources", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a paymentSource without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/payment_sources", null);
+  }
+
+  /** list a paymentSource using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public PaymentSourceListResponse list(PaymentSourceListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return PaymentSourceListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public PaymentSourceListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return PaymentSourceListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** exportPaymentSource a paymentSource (executes immediately) - returns raw Response. */
+  Response exportPaymentSourceRaw(String custPaymentSourceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/export_payment_source",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * exportPaymentSource a paymentSource using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response exportPaymentSourceRaw(String custPaymentSourceId, ExportPaymentSourceParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/export_payment_source",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * exportPaymentSource a paymentSource using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response exportPaymentSourceRaw(String custPaymentSourceId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/export_payment_source",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public ExportPaymentSourceResponse exportPaymentSource(
+      String custPaymentSourceId, ExportPaymentSourceParams params) throws ChargebeeException {
+    Response response = exportPaymentSourceRaw(custPaymentSourceId, params);
+    return ExportPaymentSourceResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createUsingPaymentIntent a paymentSource using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response createUsingPaymentIntentRaw(PaymentSourceCreateUsingPaymentIntentParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/payment_sources/create_using_payment_intent",
+        params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createUsingPaymentIntent a paymentSource using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response createUsingPaymentIntentRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/payment_sources/create_using_payment_intent", jsonPayload);
+  }
+
+  public PaymentSourceCreateUsingPaymentIntentResponse createUsingPaymentIntent(
+      PaymentSourceCreateUsingPaymentIntentParams params) throws ChargebeeException {
+    Response response = createUsingPaymentIntentRaw(params);
+
+    return PaymentSourceCreateUsingPaymentIntentResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /** agreementPdf a paymentSource (executes immediately) - returns raw Response. */
+  Response agreementPdfRaw(String custPaymentSourceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/agreement_pdf",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+
+    return post(path, null);
+  }
+
+  public PaymentSourceAgreementPdfResponse agreementPdf(String custPaymentSourceId)
+      throws ChargebeeException {
+    Response response = agreementPdfRaw(custPaymentSourceId);
+    return PaymentSourceAgreementPdfResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a paymentSource (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String custPaymentSourceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+
+    return get(path, null);
+  }
+
+  public PaymentSourceRetrieveResponse retrieve(String custPaymentSourceId)
+      throws ChargebeeException {
+    Response response = retrieveRaw(custPaymentSourceId);
+    return PaymentSourceRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createVoucherPaymentSource a paymentSource using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response createVoucherPaymentSourceRaw(CreateVoucherPaymentSourceParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/payment_sources/create_voucher_payment_source",
+        params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createVoucherPaymentSource a paymentSource using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response createVoucherPaymentSourceRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/payment_sources/create_voucher_payment_source", jsonPayload);
+  }
+
+  public CreateVoucherPaymentSourceResponse createVoucherPaymentSource(
+      CreateVoucherPaymentSourceParams params) throws ChargebeeException {
+    Response response = createVoucherPaymentSourceRaw(params);
+
+    return CreateVoucherPaymentSourceResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createUsingTempToken a paymentSource using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response createUsingTempTokenRaw(PaymentSourceCreateUsingTempTokenParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/payment_sources/create_using_temp_token", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createUsingTempToken a paymentSource using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response createUsingTempTokenRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/payment_sources/create_using_temp_token", jsonPayload);
+  }
+
+  public PaymentSourceCreateUsingTempTokenResponse createUsingTempToken(
+      PaymentSourceCreateUsingTempTokenParams params) throws ChargebeeException {
+    Response response = createUsingTempTokenRaw(params);
+
+    return PaymentSourceCreateUsingTempTokenResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** updateCard a paymentSource (executes immediately) - returns raw Response. */
+  Response updateCardRaw(String custPaymentSourceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/update_card",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * updateCard a paymentSource using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response updateCardRaw(String custPaymentSourceId, PaymentSourceUpdateCardParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/update_card",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * updateCard a paymentSource using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response updateCardRaw(String custPaymentSourceId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/update_card",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public PaymentSourceUpdateCardResponse updateCard(
+      String custPaymentSourceId, PaymentSourceUpdateCardParams params) throws ChargebeeException {
+    Response response = updateCardRaw(custPaymentSourceId, params);
+    return PaymentSourceUpdateCardResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** switchGatewayAccount a paymentSource (executes immediately) - returns raw Response. */
+  Response switchGatewayAccountRaw(String custPaymentSourceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/switch_gateway_account",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * switchGatewayAccount a paymentSource using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response switchGatewayAccountRaw(
+      String custPaymentSourceId, PaymentSourceSwitchGatewayAccountParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/switch_gateway_account",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * switchGatewayAccount a paymentSource using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response switchGatewayAccountRaw(String custPaymentSourceId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/switch_gateway_account",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public PaymentSourceSwitchGatewayAccountResponse switchGatewayAccount(
+      String custPaymentSourceId, PaymentSourceSwitchGatewayAccountParams params)
+      throws ChargebeeException {
+    Response response = switchGatewayAccountRaw(custPaymentSourceId, params);
+    return PaymentSourceSwitchGatewayAccountResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createUsingToken a paymentSource using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response createUsingTokenRaw(PaymentSourceCreateUsingTokenParams params)
+      throws ChargebeeException {
+
+    return post("/payment_sources/create_using_token", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createUsingToken a paymentSource using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response createUsingTokenRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/payment_sources/create_using_token", jsonPayload);
+  }
+
+  public PaymentSourceCreateUsingTokenResponse createUsingToken(
+      PaymentSourceCreateUsingTokenParams params) throws ChargebeeException {
+    Response response = createUsingTokenRaw(params);
+
+    return PaymentSourceCreateUsingTokenResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** deleteLocal a paymentSource (executes immediately) - returns raw Response. */
+  Response deleteLocalRaw(String custPaymentSourceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/delete_local",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+
+    return post(path, null);
+  }
+
+  public PaymentSourceDeleteLocalResponse deleteLocal(String custPaymentSourceId)
+      throws ChargebeeException {
+    Response response = deleteLocalRaw(custPaymentSourceId);
+    return PaymentSourceDeleteLocalResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createBankAccount a paymentSource using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response createBankAccountRaw(PaymentSourceCreateBankAccountParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/payment_sources/create_bank_account", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createBankAccount a paymentSource using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response createBankAccountRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/payment_sources/create_bank_account", jsonPayload);
+  }
+
+  public PaymentSourceCreateBankAccountResponse createBankAccount(
+      PaymentSourceCreateBankAccountParams params) throws ChargebeeException {
+    Response response = createBankAccountRaw(params);
+
+    return PaymentSourceCreateBankAccountResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** updateBankAccount a paymentSource (executes immediately) - returns raw Response. */
+  Response updateBankAccountRaw(String custPaymentSourceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/update_bank_account",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+
+    return post(path, null);
+  }
+
+  /**
+   * updateBankAccount a paymentSource using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response updateBankAccountRaw(
+      String custPaymentSourceId, PaymentSourceUpdateBankAccountParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/update_bank_account",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * updateBankAccount a paymentSource using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response updateBankAccountRaw(String custPaymentSourceId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_sources/{cust-payment-source-id}/update_bank_account",
+            "cust-payment-source-id",
+            custPaymentSourceId);
+    return postJson(path, jsonPayload);
+  }
+
+  public PaymentSourceUpdateBankAccountResponse updateBankAccount(
+      String custPaymentSourceId, PaymentSourceUpdateBankAccountParams params)
+      throws ChargebeeException {
+    Response response = updateBankAccountRaw(custPaymentSourceId, params);
+    return PaymentSourceUpdateBankAccountResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/PaymentVoucherService.java b/src/main/java/com/chargebee/v4/services/PaymentVoucherService.java
new file mode 100644
index 00000000..066c3287
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/PaymentVoucherService.java
@@ -0,0 +1,193 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.paymentVoucher.params.PaymentVouchersForCustomerParams;
+
+import com.chargebee.v4.models.paymentVoucher.params.PaymentVouchersForInvoiceParams;
+
+import com.chargebee.v4.models.paymentVoucher.params.PaymentVoucherCreateParams;
+
+import com.chargebee.v4.models.paymentVoucher.responses.PaymentVouchersForCustomerResponse;
+
+import com.chargebee.v4.models.paymentVoucher.responses.PaymentVouchersForInvoiceResponse;
+
+import com.chargebee.v4.models.paymentVoucher.responses.PaymentVoucherRetrieveResponse;
+
+import com.chargebee.v4.models.paymentVoucher.responses.PaymentVoucherCreateResponse;
+
+public final class PaymentVoucherService extends BaseService<PaymentVoucherService> {
+
+  private final ServiceConfig config;
+
+  public PaymentVoucherService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private PaymentVoucherService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private PaymentVoucherService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  PaymentVoucherService with(RequestOptions newOptions) {
+    return new PaymentVoucherService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public PaymentVoucherService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * paymentVouchersForCustomer a paymentVoucher using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response paymentVouchersForCustomerRaw(String customerId, PaymentVouchersForCustomerParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/payment_vouchers", "customer-id", customerId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * paymentVouchersForCustomer a paymentVoucher without params (executes immediately) - returns raw
+   * Response.
+   */
+  Response paymentVouchersForCustomerRaw(String customerId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/payment_vouchers", "customer-id", customerId);
+    return get(path, null);
+  }
+
+  /**
+   * paymentVouchersForCustomer a paymentVoucher using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response paymentVouchersForCustomerRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/payment_vouchers", "customer-id", customerId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public PaymentVouchersForCustomerResponse paymentVouchersForCustomer(
+      String customerId, PaymentVouchersForCustomerParams params) throws ChargebeeException {
+    Response response = paymentVouchersForCustomerRaw(customerId, params);
+    return PaymentVouchersForCustomerResponse.fromJson(
+        response.getBodyAsString(), this, params, customerId, response);
+  }
+
+  public PaymentVouchersForCustomerResponse paymentVouchersForCustomer(String customerId)
+      throws ChargebeeException {
+    Response response = paymentVouchersForCustomerRaw(customerId);
+    return PaymentVouchersForCustomerResponse.fromJson(
+        response.getBodyAsString(), this, null, customerId, response);
+  }
+
+  /**
+   * paymentVouchersForInvoice a paymentVoucher using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response paymentVouchersForInvoiceRaw(String invoiceId, PaymentVouchersForInvoiceParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/payment_vouchers", "invoice-id", invoiceId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * paymentVouchersForInvoice a paymentVoucher without params (executes immediately) - returns raw
+   * Response.
+   */
+  Response paymentVouchersForInvoiceRaw(String invoiceId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/payment_vouchers", "invoice-id", invoiceId);
+    return get(path, null);
+  }
+
+  /**
+   * paymentVouchersForInvoice a paymentVoucher using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response paymentVouchersForInvoiceRaw(String invoiceId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/invoices/{invoice-id}/payment_vouchers", "invoice-id", invoiceId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public PaymentVouchersForInvoiceResponse paymentVouchersForInvoice(
+      String invoiceId, PaymentVouchersForInvoiceParams params) throws ChargebeeException {
+    Response response = paymentVouchersForInvoiceRaw(invoiceId, params);
+    return PaymentVouchersForInvoiceResponse.fromJson(
+        response.getBodyAsString(), this, params, invoiceId, response);
+  }
+
+  public PaymentVouchersForInvoiceResponse paymentVouchersForInvoice(String invoiceId)
+      throws ChargebeeException {
+    Response response = paymentVouchersForInvoiceRaw(invoiceId);
+    return PaymentVouchersForInvoiceResponse.fromJson(
+        response.getBodyAsString(), this, null, invoiceId, response);
+  }
+
+  /** retrieve a paymentVoucher (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String paymentVoucherId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/payment_vouchers/{payment-voucher-id}", "payment-voucher-id", paymentVoucherId);
+
+    return get(path, null);
+  }
+
+  public PaymentVoucherRetrieveResponse retrieve(String paymentVoucherId)
+      throws ChargebeeException {
+    Response response = retrieveRaw(paymentVoucherId);
+    return PaymentVoucherRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * create a paymentVoucher using immutable params (executes immediately) - returns raw Response.
+   */
+  Response createRaw(PaymentVoucherCreateParams params) throws ChargebeeException {
+
+    return post("/payment_vouchers", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * create a paymentVoucher using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/payment_vouchers", jsonPayload);
+  }
+
+  public PaymentVoucherCreateResponse create(PaymentVoucherCreateParams params)
+      throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return PaymentVoucherCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/Pc2MigrationItemFamilyService.java b/src/main/java/com/chargebee/v4/services/Pc2MigrationItemFamilyService.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/services/Pc2MigrationItemFamilyService.java
rename to src/main/java/com/chargebee/v4/services/Pc2MigrationItemFamilyService.java
index a752c2bb..91b4f87f 100644
--- a/src/main/java/com/chargebee/v4/core/services/Pc2MigrationItemFamilyService.java
+++ b/src/main/java/com/chargebee/v4/services/Pc2MigrationItemFamilyService.java
@@ -5,27 +5,28 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.pc2MigrationItemFamily.params.Pc2MigrationItemFamilyUpdateParams;
+import com.chargebee.v4.models.pc2MigrationItemFamily.params.Pc2MigrationItemFamilyUpdateParams;
 
-import com.chargebee.v4.core.models.pc2MigrationItemFamily.params.Pc2MigrationItemFamilyListParams;
+import com.chargebee.v4.models.pc2MigrationItemFamily.params.Pc2MigrationItemFamilyListParams;
 
-import com.chargebee.v4.core.models.pc2MigrationItemFamily.params.Pc2MigrationItemFamilyCreateParams;
+import com.chargebee.v4.models.pc2MigrationItemFamily.params.Pc2MigrationItemFamilyCreateParams;
 
-import com.chargebee.v4.core.responses.pc2MigrationItemFamily.Pc2MigrationItemFamilyDeleteResponse;
+import com.chargebee.v4.models.pc2MigrationItemFamily.responses.Pc2MigrationItemFamilyDeleteResponse;
 
-import com.chargebee.v4.core.responses.pc2MigrationItemFamily.Pc2MigrationItemFamilyRetrieveResponse;
+import com.chargebee.v4.models.pc2MigrationItemFamily.responses.Pc2MigrationItemFamilyRetrieveResponse;
 
-import com.chargebee.v4.core.responses.pc2MigrationItemFamily.Pc2MigrationItemFamilyUpdateResponse;
+import com.chargebee.v4.models.pc2MigrationItemFamily.responses.Pc2MigrationItemFamilyUpdateResponse;
 
-import com.chargebee.v4.core.responses.pc2MigrationItemFamily.Pc2MigrationItemFamilyListResponse;
+import com.chargebee.v4.models.pc2MigrationItemFamily.responses.Pc2MigrationItemFamilyListResponse;
 
-import com.chargebee.v4.core.responses.pc2MigrationItemFamily.Pc2MigrationItemFamilyCreateResponse;
+import com.chargebee.v4.models.pc2MigrationItemFamily.responses.Pc2MigrationItemFamilyCreateResponse;
 
 public final class Pc2MigrationItemFamilyService
     extends BaseService<Pc2MigrationItemFamilyService> {
@@ -64,7 +65,7 @@ public Pc2MigrationItemFamilyService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** delete a pc2MigrationItemFamily (executes immediately) - returns raw Response. */
-  Response deleteRaw(String pc2MigrationItemFamilyId) throws Exception {
+  Response deleteRaw(String pc2MigrationItemFamilyId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_item_families/{pc2-migration-item-family-id}/delete",
@@ -75,13 +76,13 @@ Response deleteRaw(String pc2MigrationItemFamilyId) throws Exception {
   }
 
   public Pc2MigrationItemFamilyDeleteResponse delete(String pc2MigrationItemFamilyId)
-      throws Exception {
+      throws ChargebeeException {
     Response response = deleteRaw(pc2MigrationItemFamilyId);
     return Pc2MigrationItemFamilyDeleteResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** retrieve a pc2MigrationItemFamily (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String pc2MigrationItemFamilyId) throws Exception {
+  Response retrieveRaw(String pc2MigrationItemFamilyId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_item_families/{pc2-migration-item-family-id}",
@@ -92,13 +93,13 @@ Response retrieveRaw(String pc2MigrationItemFamilyId) throws Exception {
   }
 
   public Pc2MigrationItemFamilyRetrieveResponse retrieve(String pc2MigrationItemFamilyId)
-      throws Exception {
+      throws ChargebeeException {
     Response response = retrieveRaw(pc2MigrationItemFamilyId);
     return Pc2MigrationItemFamilyRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a pc2MigrationItemFamily (executes immediately) - returns raw Response. */
-  Response updateRaw(String pc2MigrationItemFamilyId) throws Exception {
+  Response updateRaw(String pc2MigrationItemFamilyId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_item_families/{pc2-migration-item-family-id}",
@@ -113,7 +114,7 @@ Response updateRaw(String pc2MigrationItemFamilyId) throws Exception {
    * Response.
    */
   Response updateRaw(String pc2MigrationItemFamilyId, Pc2MigrationItemFamilyUpdateParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_item_families/{pc2-migration-item-family-id}",
@@ -126,7 +127,8 @@ Response updateRaw(String pc2MigrationItemFamilyId, Pc2MigrationItemFamilyUpdate
    * update a pc2MigrationItemFamily using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response updateRaw(String pc2MigrationItemFamilyId, String jsonPayload) throws Exception {
+  Response updateRaw(String pc2MigrationItemFamilyId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_item_families/{pc2-migration-item-family-id}",
@@ -136,7 +138,8 @@ Response updateRaw(String pc2MigrationItemFamilyId, String jsonPayload) throws E
   }
 
   public Pc2MigrationItemFamilyUpdateResponse update(
-      String pc2MigrationItemFamilyId, Pc2MigrationItemFamilyUpdateParams params) throws Exception {
+      String pc2MigrationItemFamilyId, Pc2MigrationItemFamilyUpdateParams params)
+      throws ChargebeeException {
     Response response = updateRaw(pc2MigrationItemFamilyId, params);
     return Pc2MigrationItemFamilyUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
@@ -145,13 +148,13 @@ public Pc2MigrationItemFamilyUpdateResponse update(
    * list a pc2MigrationItemFamily using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response listRaw(Pc2MigrationItemFamilyListParams params) throws Exception {
+  Response listRaw(Pc2MigrationItemFamilyListParams params) throws ChargebeeException {
 
     return get("/pc2_migration_item_families", params != null ? params.toQueryParams() : null);
   }
 
   /** list a pc2MigrationItemFamily without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/pc2_migration_item_families", null);
   }
@@ -160,20 +163,20 @@ Response listRaw() throws Exception {
    * list a pc2MigrationItemFamily using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public Pc2MigrationItemFamilyListResponse list(Pc2MigrationItemFamilyListParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = listRaw(params);
 
     return Pc2MigrationItemFamilyListResponse.fromJson(
         response.getBodyAsString(), this, params, response);
   }
 
-  public Pc2MigrationItemFamilyListResponse list() throws Exception {
+  public Pc2MigrationItemFamilyListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return Pc2MigrationItemFamilyListResponse.fromJson(
         response.getBodyAsString(), this, null, response);
@@ -183,7 +186,7 @@ public Pc2MigrationItemFamilyListResponse list() throws Exception {
    * create a pc2MigrationItemFamily using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response createRaw(Pc2MigrationItemFamilyCreateParams params) throws Exception {
+  Response createRaw(Pc2MigrationItemFamilyCreateParams params) throws ChargebeeException {
 
     return post("/pc2_migration_item_families", params != null ? params.toFormData() : null);
   }
@@ -192,13 +195,13 @@ Response createRaw(Pc2MigrationItemFamilyCreateParams params) throws Exception {
    * create a pc2MigrationItemFamily using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/pc2_migration_item_families", jsonPayload);
   }
 
   public Pc2MigrationItemFamilyCreateResponse create(Pc2MigrationItemFamilyCreateParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = createRaw(params);
 
     return Pc2MigrationItemFamilyCreateResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/core/services/Pc2MigrationItemPriceService.java b/src/main/java/com/chargebee/v4/services/Pc2MigrationItemPriceService.java
similarity index 79%
rename from src/main/java/com/chargebee/v4/core/services/Pc2MigrationItemPriceService.java
rename to src/main/java/com/chargebee/v4/services/Pc2MigrationItemPriceService.java
index bf765515..1b3ede9f 100644
--- a/src/main/java/com/chargebee/v4/core/services/Pc2MigrationItemPriceService.java
+++ b/src/main/java/com/chargebee/v4/services/Pc2MigrationItemPriceService.java
@@ -5,23 +5,24 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.pc2MigrationItemPrice.params.Pc2MigrationItemPriceListParams;
+import com.chargebee.v4.models.pc2MigrationItemPrice.params.Pc2MigrationItemPriceListParams;
 
-import com.chargebee.v4.core.models.pc2MigrationItemPrice.params.Pc2MigrationItemPriceUpdateParams;
+import com.chargebee.v4.models.pc2MigrationItemPrice.params.Pc2MigrationItemPriceUpdateParams;
 
-import com.chargebee.v4.core.responses.pc2MigrationItemPrice.Pc2MigrationItemPriceListResponse;
+import com.chargebee.v4.models.pc2MigrationItemPrice.responses.Pc2MigrationItemPriceListResponse;
 
-import com.chargebee.v4.core.responses.pc2MigrationItemPrice.Pc2MigrationItemPriceDeleteResponse;
+import com.chargebee.v4.models.pc2MigrationItemPrice.responses.Pc2MigrationItemPriceDeleteResponse;
 
-import com.chargebee.v4.core.responses.pc2MigrationItemPrice.Pc2MigrationItemPriceRetrieveResponse;
+import com.chargebee.v4.models.pc2MigrationItemPrice.responses.Pc2MigrationItemPriceRetrieveResponse;
 
-import com.chargebee.v4.core.responses.pc2MigrationItemPrice.Pc2MigrationItemPriceUpdateResponse;
+import com.chargebee.v4.models.pc2MigrationItemPrice.responses.Pc2MigrationItemPriceUpdateResponse;
 
 public final class Pc2MigrationItemPriceService extends BaseService<Pc2MigrationItemPriceService> {
 
@@ -62,13 +63,13 @@ public Pc2MigrationItemPriceService withOptions(RequestOptions options) {
    * list a pc2MigrationItemPrice using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response listRaw(Pc2MigrationItemPriceListParams params) throws Exception {
+  Response listRaw(Pc2MigrationItemPriceListParams params) throws ChargebeeException {
 
     return get("/pc2_migration_item_prices", params != null ? params.toQueryParams() : null);
   }
 
   /** list a pc2MigrationItemPrice without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/pc2_migration_item_prices", null);
   }
@@ -77,27 +78,27 @@ Response listRaw() throws Exception {
    * list a pc2MigrationItemPrice using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public Pc2MigrationItemPriceListResponse list(Pc2MigrationItemPriceListParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = listRaw(params);
 
     return Pc2MigrationItemPriceListResponse.fromJson(
         response.getBodyAsString(), this, params, response);
   }
 
-  public Pc2MigrationItemPriceListResponse list() throws Exception {
+  public Pc2MigrationItemPriceListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return Pc2MigrationItemPriceListResponse.fromJson(
         response.getBodyAsString(), this, null, response);
   }
 
   /** delete a pc2MigrationItemPrice (executes immediately) - returns raw Response. */
-  Response deleteRaw(String pc2MigrationItemPriceId) throws Exception {
+  Response deleteRaw(String pc2MigrationItemPriceId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_item_prices/{pc2-migration-item-price-id}/delete",
@@ -108,13 +109,13 @@ Response deleteRaw(String pc2MigrationItemPriceId) throws Exception {
   }
 
   public Pc2MigrationItemPriceDeleteResponse delete(String pc2MigrationItemPriceId)
-      throws Exception {
+      throws ChargebeeException {
     Response response = deleteRaw(pc2MigrationItemPriceId);
     return Pc2MigrationItemPriceDeleteResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** retrieve a pc2MigrationItemPrice (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String pc2MigrationItemPriceId) throws Exception {
+  Response retrieveRaw(String pc2MigrationItemPriceId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_item_prices/{pc2-migration-item-price-id}",
@@ -125,13 +126,13 @@ Response retrieveRaw(String pc2MigrationItemPriceId) throws Exception {
   }
 
   public Pc2MigrationItemPriceRetrieveResponse retrieve(String pc2MigrationItemPriceId)
-      throws Exception {
+      throws ChargebeeException {
     Response response = retrieveRaw(pc2MigrationItemPriceId);
     return Pc2MigrationItemPriceRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a pc2MigrationItemPrice (executes immediately) - returns raw Response. */
-  Response updateRaw(String pc2MigrationItemPriceId) throws Exception {
+  Response updateRaw(String pc2MigrationItemPriceId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_item_prices/{pc2-migration-item-price-id}",
@@ -146,7 +147,7 @@ Response updateRaw(String pc2MigrationItemPriceId) throws Exception {
    * Response.
    */
   Response updateRaw(String pc2MigrationItemPriceId, Pc2MigrationItemPriceUpdateParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_item_prices/{pc2-migration-item-price-id}",
@@ -159,7 +160,7 @@ Response updateRaw(String pc2MigrationItemPriceId, Pc2MigrationItemPriceUpdatePa
    * update a pc2MigrationItemPrice using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response updateRaw(String pc2MigrationItemPriceId, String jsonPayload) throws Exception {
+  Response updateRaw(String pc2MigrationItemPriceId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_item_prices/{pc2-migration-item-price-id}",
@@ -169,7 +170,8 @@ Response updateRaw(String pc2MigrationItemPriceId, String jsonPayload) throws Ex
   }
 
   public Pc2MigrationItemPriceUpdateResponse update(
-      String pc2MigrationItemPriceId, Pc2MigrationItemPriceUpdateParams params) throws Exception {
+      String pc2MigrationItemPriceId, Pc2MigrationItemPriceUpdateParams params)
+      throws ChargebeeException {
     Response response = updateRaw(pc2MigrationItemPriceId, params);
     return Pc2MigrationItemPriceUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/core/services/Pc2MigrationItemService.java b/src/main/java/com/chargebee/v4/services/Pc2MigrationItemService.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/services/Pc2MigrationItemService.java
rename to src/main/java/com/chargebee/v4/services/Pc2MigrationItemService.java
index 5d3be31c..2da39717 100644
--- a/src/main/java/com/chargebee/v4/core/services/Pc2MigrationItemService.java
+++ b/src/main/java/com/chargebee/v4/services/Pc2MigrationItemService.java
@@ -5,31 +5,32 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.pc2MigrationItem.params.Pc2MigrationItemUpdateParams;
+import com.chargebee.v4.models.pc2MigrationItem.params.Pc2MigrationItemUpdateParams;
 
-import com.chargebee.v4.core.models.pc2MigrationItem.params.Pc2MigrationItemListParams;
+import com.chargebee.v4.models.pc2MigrationItem.params.Pc2MigrationItemListParams;
 
-import com.chargebee.v4.core.models.pc2MigrationItem.params.Pc2MigrationItemCreateParams;
+import com.chargebee.v4.models.pc2MigrationItem.params.Pc2MigrationItemCreateParams;
 
-import com.chargebee.v4.core.models.pc2MigrationItem.params.Pc2MigrationItemListApplicableAddonsParams;
+import com.chargebee.v4.models.pc2MigrationItem.params.Pc2MigrationItemListApplicableAddonsParams;
 
-import com.chargebee.v4.core.responses.pc2MigrationItem.Pc2MigrationItemRetrieveResponse;
+import com.chargebee.v4.models.pc2MigrationItem.responses.Pc2MigrationItemRetrieveResponse;
 
-import com.chargebee.v4.core.responses.pc2MigrationItem.Pc2MigrationItemUpdateResponse;
+import com.chargebee.v4.models.pc2MigrationItem.responses.Pc2MigrationItemUpdateResponse;
 
-import com.chargebee.v4.core.responses.pc2MigrationItem.Pc2MigrationItemDeleteResponse;
+import com.chargebee.v4.models.pc2MigrationItem.responses.Pc2MigrationItemDeleteResponse;
 
-import com.chargebee.v4.core.responses.pc2MigrationItem.Pc2MigrationItemListResponse;
+import com.chargebee.v4.models.pc2MigrationItem.responses.Pc2MigrationItemListResponse;
 
-import com.chargebee.v4.core.responses.pc2MigrationItem.Pc2MigrationItemCreateResponse;
+import com.chargebee.v4.models.pc2MigrationItem.responses.Pc2MigrationItemCreateResponse;
 
-import com.chargebee.v4.core.responses.pc2MigrationItem.Pc2MigrationItemListApplicableAddonsResponse;
+import com.chargebee.v4.models.pc2MigrationItem.responses.Pc2MigrationItemListApplicableAddonsResponse;
 
 public final class Pc2MigrationItemService extends BaseService<Pc2MigrationItemService> {
 
@@ -67,7 +68,7 @@ public Pc2MigrationItemService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** retrieve a pc2MigrationItem (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String pc2MigrationItemId) throws Exception {
+  Response retrieveRaw(String pc2MigrationItemId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_items/{pc2-migration-item-id}",
@@ -77,13 +78,14 @@ Response retrieveRaw(String pc2MigrationItemId) throws Exception {
     return get(path, null);
   }
 
-  public Pc2MigrationItemRetrieveResponse retrieve(String pc2MigrationItemId) throws Exception {
+  public Pc2MigrationItemRetrieveResponse retrieve(String pc2MigrationItemId)
+      throws ChargebeeException {
     Response response = retrieveRaw(pc2MigrationItemId);
     return Pc2MigrationItemRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a pc2MigrationItem (executes immediately) - returns raw Response. */
-  Response updateRaw(String pc2MigrationItemId) throws Exception {
+  Response updateRaw(String pc2MigrationItemId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_items/{pc2-migration-item-id}",
@@ -97,7 +99,7 @@ Response updateRaw(String pc2MigrationItemId) throws Exception {
    * update a pc2MigrationItem using immutable params (executes immediately) - returns raw Response.
    */
   Response updateRaw(String pc2MigrationItemId, Pc2MigrationItemUpdateParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_items/{pc2-migration-item-id}",
@@ -109,7 +111,7 @@ Response updateRaw(String pc2MigrationItemId, Pc2MigrationItemUpdateParams param
   /**
    * update a pc2MigrationItem using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response updateRaw(String pc2MigrationItemId, String jsonPayload) throws Exception {
+  Response updateRaw(String pc2MigrationItemId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_items/{pc2-migration-item-id}",
@@ -119,13 +121,13 @@ Response updateRaw(String pc2MigrationItemId, String jsonPayload) throws Excepti
   }
 
   public Pc2MigrationItemUpdateResponse update(
-      String pc2MigrationItemId, Pc2MigrationItemUpdateParams params) throws Exception {
+      String pc2MigrationItemId, Pc2MigrationItemUpdateParams params) throws ChargebeeException {
     Response response = updateRaw(pc2MigrationItemId, params);
     return Pc2MigrationItemUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** delete a pc2MigrationItem (executes immediately) - returns raw Response. */
-  Response deleteRaw(String pc2MigrationItemId) throws Exception {
+  Response deleteRaw(String pc2MigrationItemId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migration_items/{pc2-migration-item-id}/delete",
@@ -135,7 +137,8 @@ Response deleteRaw(String pc2MigrationItemId) throws Exception {
     return post(path, null);
   }
 
-  public Pc2MigrationItemDeleteResponse delete(String pc2MigrationItemId) throws Exception {
+  public Pc2MigrationItemDeleteResponse delete(String pc2MigrationItemId)
+      throws ChargebeeException {
     Response response = deleteRaw(pc2MigrationItemId);
     return Pc2MigrationItemDeleteResponse.fromJson(response.getBodyAsString(), response);
   }
@@ -143,13 +146,13 @@ public Pc2MigrationItemDeleteResponse delete(String pc2MigrationItemId) throws E
   /**
    * list a pc2MigrationItem using immutable params (executes immediately) - returns raw Response.
    */
-  Response listRaw(Pc2MigrationItemListParams params) throws Exception {
+  Response listRaw(Pc2MigrationItemListParams params) throws ChargebeeException {
 
     return get("/pc2_migration_items", params != null ? params.toQueryParams() : null);
   }
 
   /** list a pc2MigrationItem without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/pc2_migration_items", null);
   }
@@ -157,19 +160,20 @@ Response listRaw() throws Exception {
   /**
    * list a pc2MigrationItem using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public Pc2MigrationItemListResponse list(Pc2MigrationItemListParams params) throws Exception {
+  public Pc2MigrationItemListResponse list(Pc2MigrationItemListParams params)
+      throws ChargebeeException {
     Response response = listRaw(params);
 
     return Pc2MigrationItemListResponse.fromJson(
         response.getBodyAsString(), this, params, response);
   }
 
-  public Pc2MigrationItemListResponse list() throws Exception {
+  public Pc2MigrationItemListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return Pc2MigrationItemListResponse.fromJson(response.getBodyAsString(), this, null, response);
   }
@@ -177,7 +181,7 @@ public Pc2MigrationItemListResponse list() throws Exception {
   /**
    * create a pc2MigrationItem using immutable params (executes immediately) - returns raw Response.
    */
-  Response createRaw(Pc2MigrationItemCreateParams params) throws Exception {
+  Response createRaw(Pc2MigrationItemCreateParams params) throws ChargebeeException {
 
     return post("/pc2_migration_items", params != null ? params.toFormData() : null);
   }
@@ -185,13 +189,13 @@ Response createRaw(Pc2MigrationItemCreateParams params) throws Exception {
   /**
    * create a pc2MigrationItem using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/pc2_migration_items", jsonPayload);
   }
 
   public Pc2MigrationItemCreateResponse create(Pc2MigrationItemCreateParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = createRaw(params);
 
     return Pc2MigrationItemCreateResponse.fromJson(response.getBodyAsString(), response);
@@ -202,7 +206,7 @@ public Pc2MigrationItemCreateResponse create(Pc2MigrationItemCreateParams params
    * raw Response.
    */
   Response listApplicableAddonsRaw(Pc2MigrationItemListApplicableAddonsParams params)
-      throws Exception {
+      throws ChargebeeException {
 
     return get(
         "/pc2_migration_items/applicable_items", params != null ? params.toQueryParams() : null);
@@ -212,7 +216,7 @@ Response listApplicableAddonsRaw(Pc2MigrationItemListApplicableAddonsParams para
    * listApplicableAddons a pc2MigrationItem without params (executes immediately) - returns raw
    * Response.
    */
-  Response listApplicableAddonsRaw() throws Exception {
+  Response listApplicableAddonsRaw() throws ChargebeeException {
 
     return get("/pc2_migration_items/applicable_items", null);
   }
@@ -221,20 +225,21 @@ Response listApplicableAddonsRaw() throws Exception {
    * listApplicableAddons a pc2MigrationItem using raw JSON payload (executes immediately) - returns
    * raw Response.
    */
-  Response listApplicableAddonsRaw(String jsonPayload) throws Exception {
+  Response listApplicableAddonsRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public Pc2MigrationItemListApplicableAddonsResponse listApplicableAddons(
-      Pc2MigrationItemListApplicableAddonsParams params) throws Exception {
+      Pc2MigrationItemListApplicableAddonsParams params) throws ChargebeeException {
     Response response = listApplicableAddonsRaw(params);
 
     return Pc2MigrationItemListApplicableAddonsResponse.fromJson(
         response.getBodyAsString(), this, params, response);
   }
 
-  public Pc2MigrationItemListApplicableAddonsResponse listApplicableAddons() throws Exception {
+  public Pc2MigrationItemListApplicableAddonsResponse listApplicableAddons()
+      throws ChargebeeException {
     Response response = listApplicableAddonsRaw();
     return Pc2MigrationItemListApplicableAddonsResponse.fromJson(
         response.getBodyAsString(), this, null, response);
diff --git a/src/main/java/com/chargebee/v4/core/services/Pc2MigrationService.java b/src/main/java/com/chargebee/v4/services/Pc2MigrationService.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/services/Pc2MigrationService.java
rename to src/main/java/com/chargebee/v4/services/Pc2MigrationService.java
index 2f2eb328..55c58f7e 100644
--- a/src/main/java/com/chargebee/v4/core/services/Pc2MigrationService.java
+++ b/src/main/java/com/chargebee/v4/services/Pc2MigrationService.java
@@ -5,21 +5,22 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.pc2Migration.params.Pc2MigrationCreateParams;
+import com.chargebee.v4.models.pc2Migration.params.Pc2MigrationCreateParams;
 
-import com.chargebee.v4.core.responses.pc2Migration.Pc2MigrationContactSupportResponse;
+import com.chargebee.v4.models.pc2Migration.responses.Pc2MigrationContactSupportResponse;
 
-import com.chargebee.v4.core.responses.pc2Migration.Pc2MigrationRetrieveResponse;
+import com.chargebee.v4.models.pc2Migration.responses.Pc2MigrationRetrieveResponse;
 
-import com.chargebee.v4.core.responses.pc2Migration.Pc2MigrationCreateResponse;
+import com.chargebee.v4.models.pc2Migration.responses.Pc2MigrationCreateResponse;
 
-import com.chargebee.v4.core.responses.pc2Migration.Pc2MigrationInitiateResponse;
+import com.chargebee.v4.models.pc2Migration.responses.Pc2MigrationInitiateResponse;
 
 public final class Pc2MigrationService extends BaseService<Pc2MigrationService> {
 
@@ -57,7 +58,7 @@ public Pc2MigrationService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** contactSupport a pc2Migration (executes immediately) - returns raw Response. */
-  Response contactSupportRaw(String pc2MigrationId) throws Exception {
+  Response contactSupportRaw(String pc2MigrationId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migrations/{pc2-migration-id}/contact_support",
@@ -67,13 +68,14 @@ Response contactSupportRaw(String pc2MigrationId) throws Exception {
     return post(path, null);
   }
 
-  public Pc2MigrationContactSupportResponse contactSupport(String pc2MigrationId) throws Exception {
+  public Pc2MigrationContactSupportResponse contactSupport(String pc2MigrationId)
+      throws ChargebeeException {
     Response response = contactSupportRaw(pc2MigrationId);
     return Pc2MigrationContactSupportResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** retrieve a pc2Migration (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String pc2MigrationId) throws Exception {
+  Response retrieveRaw(String pc2MigrationId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migrations/{pc2-migration-id}", "pc2-migration-id", pc2MigrationId);
@@ -81,31 +83,32 @@ Response retrieveRaw(String pc2MigrationId) throws Exception {
     return get(path, null);
   }
 
-  public Pc2MigrationRetrieveResponse retrieve(String pc2MigrationId) throws Exception {
+  public Pc2MigrationRetrieveResponse retrieve(String pc2MigrationId) throws ChargebeeException {
     Response response = retrieveRaw(pc2MigrationId);
     return Pc2MigrationRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** create a pc2Migration using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(Pc2MigrationCreateParams params) throws Exception {
+  Response createRaw(Pc2MigrationCreateParams params) throws ChargebeeException {
 
     return post("/pc2_migrations", params != null ? params.toFormData() : null);
   }
 
   /** create a pc2Migration using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/pc2_migrations", jsonPayload);
   }
 
-  public Pc2MigrationCreateResponse create(Pc2MigrationCreateParams params) throws Exception {
+  public Pc2MigrationCreateResponse create(Pc2MigrationCreateParams params)
+      throws ChargebeeException {
     Response response = createRaw(params);
 
     return Pc2MigrationCreateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** initiate a pc2Migration (executes immediately) - returns raw Response. */
-  Response initiateRaw(String pc2MigrationId) throws Exception {
+  Response initiateRaw(String pc2MigrationId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/pc2_migrations/{pc2-migration-id}/initiate", "pc2-migration-id", pc2MigrationId);
@@ -113,7 +116,7 @@ Response initiateRaw(String pc2MigrationId) throws Exception {
     return post(path, null);
   }
 
-  public Pc2MigrationInitiateResponse initiate(String pc2MigrationId) throws Exception {
+  public Pc2MigrationInitiateResponse initiate(String pc2MigrationId) throws ChargebeeException {
     Response response = initiateRaw(pc2MigrationId);
     return Pc2MigrationInitiateResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/services/PersonalizedOfferService.java b/src/main/java/com/chargebee/v4/services/PersonalizedOfferService.java
new file mode 100644
index 00000000..489f72fa
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/PersonalizedOfferService.java
@@ -0,0 +1,78 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.personalizedOffer.params.PersonalizedOffersParams;
+
+import com.chargebee.v4.models.personalizedOffer.responses.PersonalizedOffersResponse;
+
+public final class PersonalizedOfferService extends BaseService<PersonalizedOfferService> {
+
+  private final ServiceConfig config;
+
+  public PersonalizedOfferService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private PersonalizedOfferService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private PersonalizedOfferService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  PersonalizedOfferService with(RequestOptions newOptions) {
+    return new PersonalizedOfferService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public PersonalizedOfferService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * personalizedOffers a personalizedOffer using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response personalizedOffersRaw(PersonalizedOffersParams params) throws ChargebeeException {
+
+    return post("/personalized_offers", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * personalizedOffers a personalizedOffer using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response personalizedOffersRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/personalized_offers", jsonPayload);
+  }
+
+  public PersonalizedOffersResponse personalizedOffers(PersonalizedOffersParams params)
+      throws ChargebeeException {
+    Response response = personalizedOffersRaw(params);
+
+    return PersonalizedOffersResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/PlanService.java b/src/main/java/com/chargebee/v4/services/PlanService.java
new file mode 100644
index 00000000..3566cd75
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/PlanService.java
@@ -0,0 +1,196 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.plan.params.PlanCopyParams;
+
+import com.chargebee.v4.models.plan.params.PlanListParams;
+
+import com.chargebee.v4.models.plan.params.PlanCreateParams;
+
+import com.chargebee.v4.models.plan.params.PlanUpdateParams;
+
+import com.chargebee.v4.models.plan.responses.PlanUnarchiveResponse;
+
+import com.chargebee.v4.models.plan.responses.PlanDeleteResponse;
+
+import com.chargebee.v4.models.plan.responses.PlanCopyResponse;
+
+import com.chargebee.v4.models.plan.responses.PlanListResponse;
+
+import com.chargebee.v4.models.plan.responses.PlanCreateResponse;
+
+import com.chargebee.v4.models.plan.responses.PlanRetrieveResponse;
+
+import com.chargebee.v4.models.plan.responses.PlanUpdateResponse;
+
+public final class PlanService extends BaseService<PlanService> {
+
+  private final ServiceConfig config;
+
+  public PlanService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private PlanService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private PlanService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  PlanService with(RequestOptions newOptions) {
+    return new PlanService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public PlanService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** unarchive a plan (executes immediately) - returns raw Response. */
+  Response unarchiveRaw(String planId) throws ChargebeeException {
+    String path = buildPathWithParams("/plans/{plan-id}/unarchive", "plan-id", planId);
+
+    return post(path, null);
+  }
+
+  public PlanUnarchiveResponse unarchive(String planId) throws ChargebeeException {
+    Response response = unarchiveRaw(planId);
+    return PlanUnarchiveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** delete a plan (executes immediately) - returns raw Response. */
+  Response deleteRaw(String planId) throws ChargebeeException {
+    String path = buildPathWithParams("/plans/{plan-id}/delete", "plan-id", planId);
+
+    return post(path, null);
+  }
+
+  public PlanDeleteResponse delete(String planId) throws ChargebeeException {
+    Response response = deleteRaw(planId);
+    return PlanDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** copy a plan using immutable params (executes immediately) - returns raw Response. */
+  Response copyRaw(PlanCopyParams params) throws ChargebeeException {
+
+    return post("/plans/copy", params != null ? params.toFormData() : null);
+  }
+
+  /** copy a plan using raw JSON payload (executes immediately) - returns raw Response. */
+  Response copyRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/plans/copy", jsonPayload);
+  }
+
+  public PlanCopyResponse copy(PlanCopyParams params) throws ChargebeeException {
+    Response response = copyRaw(params);
+
+    return PlanCopyResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** list a plan using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(PlanListParams params) throws ChargebeeException {
+
+    return get("/plans", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a plan without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/plans", null);
+  }
+
+  /** list a plan using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public PlanListResponse list(PlanListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return PlanListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public PlanListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return PlanListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** create a plan using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(PlanCreateParams params) throws ChargebeeException {
+
+    return post("/plans", params != null ? params.toFormData() : null);
+  }
+
+  /** create a plan using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/plans", jsonPayload);
+  }
+
+  public PlanCreateResponse create(PlanCreateParams params) throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return PlanCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a plan (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String planId) throws ChargebeeException {
+    String path = buildPathWithParams("/plans/{plan-id}", "plan-id", planId);
+
+    return get(path, null);
+  }
+
+  public PlanRetrieveResponse retrieve(String planId) throws ChargebeeException {
+    Response response = retrieveRaw(planId);
+    return PlanRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** update a plan (executes immediately) - returns raw Response. */
+  Response updateRaw(String planId) throws ChargebeeException {
+    String path = buildPathWithParams("/plans/{plan-id}", "plan-id", planId);
+
+    return post(path, null);
+  }
+
+  /** update a plan using immutable params (executes immediately) - returns raw Response. */
+  Response updateRaw(String planId, PlanUpdateParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/plans/{plan-id}", "plan-id", planId);
+    return post(path, params.toFormData());
+  }
+
+  /** update a plan using raw JSON payload (executes immediately) - returns raw Response. */
+  Response updateRaw(String planId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/plans/{plan-id}", "plan-id", planId);
+    return postJson(path, jsonPayload);
+  }
+
+  public PlanUpdateResponse update(String planId, PlanUpdateParams params)
+      throws ChargebeeException {
+    Response response = updateRaw(planId, params);
+    return PlanUpdateResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/PortalSessionService.java b/src/main/java/com/chargebee/v4/services/PortalSessionService.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/services/PortalSessionService.java
rename to src/main/java/com/chargebee/v4/services/PortalSessionService.java
index 828a6341..9e928f65 100644
--- a/src/main/java/com/chargebee/v4/core/services/PortalSessionService.java
+++ b/src/main/java/com/chargebee/v4/services/PortalSessionService.java
@@ -5,23 +5,24 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.portalSession.params.PortalSessionCreateParams;
+import com.chargebee.v4.models.portalSession.params.PortalSessionCreateParams;
 
-import com.chargebee.v4.core.models.portalSession.params.PortalSessionActivateParams;
+import com.chargebee.v4.models.portalSession.params.PortalSessionActivateParams;
 
-import com.chargebee.v4.core.responses.portalSession.PortalSessionCreateResponse;
+import com.chargebee.v4.models.portalSession.responses.PortalSessionCreateResponse;
 
-import com.chargebee.v4.core.responses.portalSession.PortalSessionActivateResponse;
+import com.chargebee.v4.models.portalSession.responses.PortalSessionActivateResponse;
 
-import com.chargebee.v4.core.responses.portalSession.PortalSessionLogoutResponse;
+import com.chargebee.v4.models.portalSession.responses.PortalSessionLogoutResponse;
 
-import com.chargebee.v4.core.responses.portalSession.PortalSessionRetrieveResponse;
+import com.chargebee.v4.models.portalSession.responses.PortalSessionRetrieveResponse;
 
 public final class PortalSessionService extends BaseService<PortalSessionService> {
 
@@ -61,7 +62,7 @@ public PortalSessionService withOptions(RequestOptions options) {
   /**
    * create a portalSession using immutable params (executes immediately) - returns raw Response.
    */
-  Response createRaw(PortalSessionCreateParams params) throws Exception {
+  Response createRaw(PortalSessionCreateParams params) throws ChargebeeException {
 
     return post("/portal_sessions", params != null ? params.toFormData() : null);
   }
@@ -69,19 +70,20 @@ Response createRaw(PortalSessionCreateParams params) throws Exception {
   /**
    * create a portalSession using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/portal_sessions", jsonPayload);
   }
 
-  public PortalSessionCreateResponse create(PortalSessionCreateParams params) throws Exception {
+  public PortalSessionCreateResponse create(PortalSessionCreateParams params)
+      throws ChargebeeException {
     Response response = createRaw(params);
 
     return PortalSessionCreateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** activate a portalSession (executes immediately) - returns raw Response. */
-  Response activateRaw(String portalSessionId) throws Exception {
+  Response activateRaw(String portalSessionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/portal_sessions/{portal-session-id}/activate", "portal-session-id", portalSessionId);
@@ -93,7 +95,7 @@ Response activateRaw(String portalSessionId) throws Exception {
    * activate a portalSession using immutable params (executes immediately) - returns raw Response.
    */
   Response activateRaw(String portalSessionId, PortalSessionActivateParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/portal_sessions/{portal-session-id}/activate", "portal-session-id", portalSessionId);
@@ -103,7 +105,7 @@ Response activateRaw(String portalSessionId, PortalSessionActivateParams params)
   /**
    * activate a portalSession using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response activateRaw(String portalSessionId, String jsonPayload) throws Exception {
+  Response activateRaw(String portalSessionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/portal_sessions/{portal-session-id}/activate", "portal-session-id", portalSessionId);
@@ -111,13 +113,13 @@ Response activateRaw(String portalSessionId, String jsonPayload) throws Exceptio
   }
 
   public PortalSessionActivateResponse activate(
-      String portalSessionId, PortalSessionActivateParams params) throws Exception {
+      String portalSessionId, PortalSessionActivateParams params) throws ChargebeeException {
     Response response = activateRaw(portalSessionId, params);
     return PortalSessionActivateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** logout a portalSession (executes immediately) - returns raw Response. */
-  Response logoutRaw(String portalSessionId) throws Exception {
+  Response logoutRaw(String portalSessionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/portal_sessions/{portal-session-id}/logout", "portal-session-id", portalSessionId);
@@ -125,13 +127,13 @@ Response logoutRaw(String portalSessionId) throws Exception {
     return post(path, null);
   }
 
-  public PortalSessionLogoutResponse logout(String portalSessionId) throws Exception {
+  public PortalSessionLogoutResponse logout(String portalSessionId) throws ChargebeeException {
     Response response = logoutRaw(portalSessionId);
     return PortalSessionLogoutResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** retrieve a portalSession (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String portalSessionId) throws Exception {
+  Response retrieveRaw(String portalSessionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/portal_sessions/{portal-session-id}", "portal-session-id", portalSessionId);
@@ -139,7 +141,7 @@ Response retrieveRaw(String portalSessionId) throws Exception {
     return get(path, null);
   }
 
-  public PortalSessionRetrieveResponse retrieve(String portalSessionId) throws Exception {
+  public PortalSessionRetrieveResponse retrieve(String portalSessionId) throws ChargebeeException {
     Response response = retrieveRaw(portalSessionId);
     return PortalSessionRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/core/services/PriceVariantService.java b/src/main/java/com/chargebee/v4/services/PriceVariantService.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/services/PriceVariantService.java
rename to src/main/java/com/chargebee/v4/services/PriceVariantService.java
index a2f0649e..d1884b26 100644
--- a/src/main/java/com/chargebee/v4/core/services/PriceVariantService.java
+++ b/src/main/java/com/chargebee/v4/services/PriceVariantService.java
@@ -5,27 +5,28 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.priceVariant.params.PriceVariantListParams;
+import com.chargebee.v4.models.priceVariant.params.PriceVariantListParams;
 
-import com.chargebee.v4.core.models.priceVariant.params.PriceVariantCreateParams;
+import com.chargebee.v4.models.priceVariant.params.PriceVariantCreateParams;
 
-import com.chargebee.v4.core.models.priceVariant.params.PriceVariantUpdateParams;
+import com.chargebee.v4.models.priceVariant.params.PriceVariantUpdateParams;
 
-import com.chargebee.v4.core.responses.priceVariant.PriceVariantDeleteResponse;
+import com.chargebee.v4.models.priceVariant.responses.PriceVariantDeleteResponse;
 
-import com.chargebee.v4.core.responses.priceVariant.PriceVariantListResponse;
+import com.chargebee.v4.models.priceVariant.responses.PriceVariantListResponse;
 
-import com.chargebee.v4.core.responses.priceVariant.PriceVariantCreateResponse;
+import com.chargebee.v4.models.priceVariant.responses.PriceVariantCreateResponse;
 
-import com.chargebee.v4.core.responses.priceVariant.PriceVariantRetrieveResponse;
+import com.chargebee.v4.models.priceVariant.responses.PriceVariantRetrieveResponse;
 
-import com.chargebee.v4.core.responses.priceVariant.PriceVariantUpdateResponse;
+import com.chargebee.v4.models.priceVariant.responses.PriceVariantUpdateResponse;
 
 public final class PriceVariantService extends BaseService<PriceVariantService> {
 
@@ -63,7 +64,7 @@ public PriceVariantService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** delete a priceVariant (executes immediately) - returns raw Response. */
-  Response deleteRaw(String priceVariantId) throws Exception {
+  Response deleteRaw(String priceVariantId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/price_variants/{price-variant-id}/delete", "price-variant-id", priceVariantId);
@@ -71,60 +72,61 @@ Response deleteRaw(String priceVariantId) throws Exception {
     return post(path, null);
   }
 
-  public PriceVariantDeleteResponse delete(String priceVariantId) throws Exception {
+  public PriceVariantDeleteResponse delete(String priceVariantId) throws ChargebeeException {
     Response response = deleteRaw(priceVariantId);
     return PriceVariantDeleteResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** list a priceVariant using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(PriceVariantListParams params) throws Exception {
+  Response listRaw(PriceVariantListParams params) throws ChargebeeException {
 
     return get("/price_variants", params != null ? params.toQueryParams() : null);
   }
 
   /** list a priceVariant without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/price_variants", null);
   }
 
   /** list a priceVariant using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public PriceVariantListResponse list(PriceVariantListParams params) throws Exception {
+  public PriceVariantListResponse list(PriceVariantListParams params) throws ChargebeeException {
     Response response = listRaw(params);
 
     return PriceVariantListResponse.fromJson(response.getBodyAsString(), this, params, response);
   }
 
-  public PriceVariantListResponse list() throws Exception {
+  public PriceVariantListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return PriceVariantListResponse.fromJson(response.getBodyAsString(), this, null, response);
   }
 
   /** create a priceVariant using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(PriceVariantCreateParams params) throws Exception {
+  Response createRaw(PriceVariantCreateParams params) throws ChargebeeException {
 
     return post("/price_variants", params != null ? params.toFormData() : null);
   }
 
   /** create a priceVariant using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/price_variants", jsonPayload);
   }
 
-  public PriceVariantCreateResponse create(PriceVariantCreateParams params) throws Exception {
+  public PriceVariantCreateResponse create(PriceVariantCreateParams params)
+      throws ChargebeeException {
     Response response = createRaw(params);
 
     return PriceVariantCreateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** retrieve a priceVariant (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String priceVariantId) throws Exception {
+  Response retrieveRaw(String priceVariantId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/price_variants/{price-variant-id}", "price-variant-id", priceVariantId);
@@ -132,13 +134,13 @@ Response retrieveRaw(String priceVariantId) throws Exception {
     return get(path, null);
   }
 
-  public PriceVariantRetrieveResponse retrieve(String priceVariantId) throws Exception {
+  public PriceVariantRetrieveResponse retrieve(String priceVariantId) throws ChargebeeException {
     Response response = retrieveRaw(priceVariantId);
     return PriceVariantRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a priceVariant (executes immediately) - returns raw Response. */
-  Response updateRaw(String priceVariantId) throws Exception {
+  Response updateRaw(String priceVariantId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/price_variants/{price-variant-id}", "price-variant-id", priceVariantId);
@@ -147,7 +149,8 @@ Response updateRaw(String priceVariantId) throws Exception {
   }
 
   /** update a priceVariant using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String priceVariantId, PriceVariantUpdateParams params) throws Exception {
+  Response updateRaw(String priceVariantId, PriceVariantUpdateParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/price_variants/{price-variant-id}", "price-variant-id", priceVariantId);
@@ -155,7 +158,7 @@ Response updateRaw(String priceVariantId, PriceVariantUpdateParams params) throw
   }
 
   /** update a priceVariant using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String priceVariantId, String jsonPayload) throws Exception {
+  Response updateRaw(String priceVariantId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/price_variants/{price-variant-id}", "price-variant-id", priceVariantId);
@@ -163,7 +166,7 @@ Response updateRaw(String priceVariantId, String jsonPayload) throws Exception {
   }
 
   public PriceVariantUpdateResponse update(String priceVariantId, PriceVariantUpdateParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = updateRaw(priceVariantId, params);
     return PriceVariantUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/core/services/PricingPageSessionService.java b/src/main/java/com/chargebee/v4/services/PricingPageSessionService.java
similarity index 82%
rename from src/main/java/com/chargebee/v4/core/services/PricingPageSessionService.java
rename to src/main/java/com/chargebee/v4/services/PricingPageSessionService.java
index dcebb6ee..763de0cf 100644
--- a/src/main/java/com/chargebee/v4/core/services/PricingPageSessionService.java
+++ b/src/main/java/com/chargebee/v4/services/PricingPageSessionService.java
@@ -5,19 +5,20 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.pricingPageSession.params.PricingPageSessionCreateForExistingSubscriptionParams;
+import com.chargebee.v4.models.pricingPageSession.params.PricingPageSessionCreateForExistingSubscriptionParams;
 
-import com.chargebee.v4.core.models.pricingPageSession.params.PricingPageSessionCreateForNewSubscriptionParams;
+import com.chargebee.v4.models.pricingPageSession.params.PricingPageSessionCreateForNewSubscriptionParams;
 
-import com.chargebee.v4.core.responses.pricingPageSession.PricingPageSessionCreateForExistingSubscriptionResponse;
+import com.chargebee.v4.models.pricingPageSession.responses.PricingPageSessionCreateForExistingSubscriptionResponse;
 
-import com.chargebee.v4.core.responses.pricingPageSession.PricingPageSessionCreateForNewSubscriptionResponse;
+import com.chargebee.v4.models.pricingPageSession.responses.PricingPageSessionCreateForNewSubscriptionResponse;
 
 public final class PricingPageSessionService extends BaseService<PricingPageSessionService> {
 
@@ -59,7 +60,7 @@ public PricingPageSessionService withOptions(RequestOptions options) {
    * immediately) - returns raw Response.
    */
   Response createForExistingSubscriptionRaw(
-      PricingPageSessionCreateForExistingSubscriptionParams params) throws Exception {
+      PricingPageSessionCreateForExistingSubscriptionParams params) throws ChargebeeException {
 
     return post(
         "/pricing_page_sessions/create_for_existing_subscription",
@@ -70,13 +71,13 @@ Response createForExistingSubscriptionRaw(
    * createForExistingSubscription a pricingPageSession using raw JSON payload (executes
    * immediately) - returns raw Response.
    */
-  Response createForExistingSubscriptionRaw(String jsonPayload) throws Exception {
+  Response createForExistingSubscriptionRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/pricing_page_sessions/create_for_existing_subscription", jsonPayload);
   }
 
   public PricingPageSessionCreateForExistingSubscriptionResponse createForExistingSubscription(
-      PricingPageSessionCreateForExistingSubscriptionParams params) throws Exception {
+      PricingPageSessionCreateForExistingSubscriptionParams params) throws ChargebeeException {
     Response response = createForExistingSubscriptionRaw(params);
 
     return PricingPageSessionCreateForExistingSubscriptionResponse.fromJson(
@@ -88,7 +89,7 @@ public PricingPageSessionCreateForExistingSubscriptionResponse createForExisting
    * returns raw Response.
    */
   Response createForNewSubscriptionRaw(PricingPageSessionCreateForNewSubscriptionParams params)
-      throws Exception {
+      throws ChargebeeException {
 
     return post(
         "/pricing_page_sessions/create_for_new_subscription",
@@ -99,13 +100,13 @@ Response createForNewSubscriptionRaw(PricingPageSessionCreateForNewSubscriptionP
    * createForNewSubscription a pricingPageSession using raw JSON payload (executes immediately) -
    * returns raw Response.
    */
-  Response createForNewSubscriptionRaw(String jsonPayload) throws Exception {
+  Response createForNewSubscriptionRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/pricing_page_sessions/create_for_new_subscription", jsonPayload);
   }
 
   public PricingPageSessionCreateForNewSubscriptionResponse createForNewSubscription(
-      PricingPageSessionCreateForNewSubscriptionParams params) throws Exception {
+      PricingPageSessionCreateForNewSubscriptionParams params) throws ChargebeeException {
     Response response = createForNewSubscriptionRaw(params);
 
     return PricingPageSessionCreateForNewSubscriptionResponse.fromJson(
diff --git a/src/main/java/com/chargebee/v4/core/services/ProductService.java b/src/main/java/com/chargebee/v4/services/ProductService.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/services/ProductService.java
rename to src/main/java/com/chargebee/v4/services/ProductService.java
index a06852a6..1e6e0270 100644
--- a/src/main/java/com/chargebee/v4/core/services/ProductService.java
+++ b/src/main/java/com/chargebee/v4/services/ProductService.java
@@ -5,31 +5,32 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.product.params.ProductUpdateParams;
+import com.chargebee.v4.models.product.params.ProductUpdateParams;
 
-import com.chargebee.v4.core.models.product.params.ProductUpdateOptionsParams;
+import com.chargebee.v4.models.product.params.ProductUpdateOptionsParams;
 
-import com.chargebee.v4.core.models.product.params.ProductListParams;
+import com.chargebee.v4.models.product.params.ProductListParams;
 
-import com.chargebee.v4.core.models.product.params.ProductCreateParams;
+import com.chargebee.v4.models.product.params.ProductCreateParams;
 
-import com.chargebee.v4.core.responses.product.ProductRetrieveResponse;
+import com.chargebee.v4.models.product.responses.ProductRetrieveResponse;
 
-import com.chargebee.v4.core.responses.product.ProductUpdateResponse;
+import com.chargebee.v4.models.product.responses.ProductUpdateResponse;
 
-import com.chargebee.v4.core.responses.product.ProductDeleteResponse;
+import com.chargebee.v4.models.product.responses.ProductDeleteResponse;
 
-import com.chargebee.v4.core.responses.product.ProductUpdateOptionsResponse;
+import com.chargebee.v4.models.product.responses.ProductUpdateOptionsResponse;
 
-import com.chargebee.v4.core.responses.product.ProductListResponse;
+import com.chargebee.v4.models.product.responses.ProductListResponse;
 
-import com.chargebee.v4.core.responses.product.ProductCreateResponse;
+import com.chargebee.v4.models.product.responses.ProductCreateResponse;
 
 public final class ProductService extends BaseService<ProductService> {
 
@@ -66,56 +67,56 @@ public ProductService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** retrieve a product (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String productId) throws Exception {
+  Response retrieveRaw(String productId) throws ChargebeeException {
     String path = buildPathWithParams("/products/{product-id}", "product-id", productId);
 
     return get(path, null);
   }
 
-  public ProductRetrieveResponse retrieve(String productId) throws Exception {
+  public ProductRetrieveResponse retrieve(String productId) throws ChargebeeException {
     Response response = retrieveRaw(productId);
     return ProductRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a product (executes immediately) - returns raw Response. */
-  Response updateRaw(String productId) throws Exception {
+  Response updateRaw(String productId) throws ChargebeeException {
     String path = buildPathWithParams("/products/{product-id}", "product-id", productId);
 
     return post(path, null);
   }
 
   /** update a product using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String productId, ProductUpdateParams params) throws Exception {
+  Response updateRaw(String productId, ProductUpdateParams params) throws ChargebeeException {
     String path = buildPathWithParams("/products/{product-id}", "product-id", productId);
     return post(path, params.toFormData());
   }
 
   /** update a product using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String productId, String jsonPayload) throws Exception {
+  Response updateRaw(String productId, String jsonPayload) throws ChargebeeException {
     String path = buildPathWithParams("/products/{product-id}", "product-id", productId);
     return postJson(path, jsonPayload);
   }
 
   public ProductUpdateResponse update(String productId, ProductUpdateParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = updateRaw(productId, params);
     return ProductUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** delete a product (executes immediately) - returns raw Response. */
-  Response deleteRaw(String productId) throws Exception {
+  Response deleteRaw(String productId) throws ChargebeeException {
     String path = buildPathWithParams("/products/{product-id}/delete", "product-id", productId);
 
     return post(path, null);
   }
 
-  public ProductDeleteResponse delete(String productId) throws Exception {
+  public ProductDeleteResponse delete(String productId) throws ChargebeeException {
     Response response = deleteRaw(productId);
     return ProductDeleteResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** updateOptions a product (executes immediately) - returns raw Response. */
-  Response updateOptionsRaw(String productId) throws Exception {
+  Response updateOptionsRaw(String productId) throws ChargebeeException {
     String path =
         buildPathWithParams("/products/{product-id}/update_options", "product-id", productId);
 
@@ -125,7 +126,8 @@ Response updateOptionsRaw(String productId) throws Exception {
   /**
    * updateOptions a product using immutable params (executes immediately) - returns raw Response.
    */
-  Response updateOptionsRaw(String productId, ProductUpdateOptionsParams params) throws Exception {
+  Response updateOptionsRaw(String productId, ProductUpdateOptionsParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams("/products/{product-id}/update_options", "product-id", productId);
     return post(path, params.toFormData());
@@ -134,60 +136,60 @@ Response updateOptionsRaw(String productId, ProductUpdateOptionsParams params) t
   /**
    * updateOptions a product using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response updateOptionsRaw(String productId, String jsonPayload) throws Exception {
+  Response updateOptionsRaw(String productId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/products/{product-id}/update_options", "product-id", productId);
     return postJson(path, jsonPayload);
   }
 
   public ProductUpdateOptionsResponse updateOptions(
-      String productId, ProductUpdateOptionsParams params) throws Exception {
+      String productId, ProductUpdateOptionsParams params) throws ChargebeeException {
     Response response = updateOptionsRaw(productId, params);
     return ProductUpdateOptionsResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** list a product using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(ProductListParams params) throws Exception {
+  Response listRaw(ProductListParams params) throws ChargebeeException {
 
     return get("/products", params != null ? params.toQueryParams() : null);
   }
 
   /** list a product without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/products", null);
   }
 
   /** list a product using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public ProductListResponse list(ProductListParams params) throws Exception {
+  public ProductListResponse list(ProductListParams params) throws ChargebeeException {
     Response response = listRaw(params);
 
     return ProductListResponse.fromJson(response.getBodyAsString(), this, params, response);
   }
 
-  public ProductListResponse list() throws Exception {
+  public ProductListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return ProductListResponse.fromJson(response.getBodyAsString(), this, null, response);
   }
 
   /** create a product using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(ProductCreateParams params) throws Exception {
+  Response createRaw(ProductCreateParams params) throws ChargebeeException {
 
     return post("/products", params != null ? params.toFormData() : null);
   }
 
   /** create a product using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/products", jsonPayload);
   }
 
-  public ProductCreateResponse create(ProductCreateParams params) throws Exception {
+  public ProductCreateResponse create(ProductCreateParams params) throws ChargebeeException {
     Response response = createRaw(params);
 
     return ProductCreateResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/services/PromotionalCreditService.java b/src/main/java/com/chargebee/v4/services/PromotionalCreditService.java
new file mode 100644
index 00000000..85626f87
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/PromotionalCreditService.java
@@ -0,0 +1,188 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.promotionalCredit.params.PromotionalCreditListParams;
+
+import com.chargebee.v4.models.promotionalCredit.params.PromotionalCreditDeductParams;
+
+import com.chargebee.v4.models.promotionalCredit.params.PromotionalCreditSetParams;
+
+import com.chargebee.v4.models.promotionalCredit.params.PromotionalCreditAddParams;
+
+import com.chargebee.v4.models.promotionalCredit.responses.PromotionalCreditRetrieveResponse;
+
+import com.chargebee.v4.models.promotionalCredit.responses.PromotionalCreditListResponse;
+
+import com.chargebee.v4.models.promotionalCredit.responses.PromotionalCreditDeductResponse;
+
+import com.chargebee.v4.models.promotionalCredit.responses.PromotionalCreditSetResponse;
+
+import com.chargebee.v4.models.promotionalCredit.responses.PromotionalCreditAddResponse;
+
+public final class PromotionalCreditService extends BaseService<PromotionalCreditService> {
+
+  private final ServiceConfig config;
+
+  public PromotionalCreditService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private PromotionalCreditService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private PromotionalCreditService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  PromotionalCreditService with(RequestOptions newOptions) {
+    return new PromotionalCreditService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public PromotionalCreditService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** retrieve a promotionalCredit (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String accountCreditId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/promotional_credits/{account-credit-id}", "account-credit-id", accountCreditId);
+
+    return get(path, null);
+  }
+
+  public PromotionalCreditRetrieveResponse retrieve(String accountCreditId)
+      throws ChargebeeException {
+    Response response = retrieveRaw(accountCreditId);
+    return PromotionalCreditRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * list a promotionalCredit using immutable params (executes immediately) - returns raw Response.
+   */
+  Response listRaw(PromotionalCreditListParams params) throws ChargebeeException {
+
+    return get("/promotional_credits", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a promotionalCredit without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/promotional_credits", null);
+  }
+
+  /**
+   * list a promotionalCredit using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public PromotionalCreditListResponse list(PromotionalCreditListParams params)
+      throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return PromotionalCreditListResponse.fromJson(
+        response.getBodyAsString(), this, params, response);
+  }
+
+  public PromotionalCreditListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return PromotionalCreditListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /**
+   * deduct a promotionalCredit using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response deductRaw(PromotionalCreditDeductParams params) throws ChargebeeException {
+
+    return post("/promotional_credits/deduct", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * deduct a promotionalCredit using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response deductRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/promotional_credits/deduct", jsonPayload);
+  }
+
+  public PromotionalCreditDeductResponse deduct(PromotionalCreditDeductParams params)
+      throws ChargebeeException {
+    Response response = deductRaw(params);
+
+    return PromotionalCreditDeductResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * set a promotionalCredit using immutable params (executes immediately) - returns raw Response.
+   */
+  Response setRaw(PromotionalCreditSetParams params) throws ChargebeeException {
+
+    return post("/promotional_credits/set", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * set a promotionalCredit using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response setRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/promotional_credits/set", jsonPayload);
+  }
+
+  public PromotionalCreditSetResponse set(PromotionalCreditSetParams params)
+      throws ChargebeeException {
+    Response response = setRaw(params);
+
+    return PromotionalCreditSetResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * add a promotionalCredit using immutable params (executes immediately) - returns raw Response.
+   */
+  Response addRaw(PromotionalCreditAddParams params) throws ChargebeeException {
+
+    return post("/promotional_credits/add", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * add a promotionalCredit using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response addRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/promotional_credits/add", jsonPayload);
+  }
+
+  public PromotionalCreditAddResponse add(PromotionalCreditAddParams params)
+      throws ChargebeeException {
+    Response response = addRaw(params);
+
+    return PromotionalCreditAddResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/PurchaseService.java b/src/main/java/com/chargebee/v4/services/PurchaseService.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/services/PurchaseService.java
rename to src/main/java/com/chargebee/v4/services/PurchaseService.java
index 6d2409a8..c40269f4 100644
--- a/src/main/java/com/chargebee/v4/core/services/PurchaseService.java
+++ b/src/main/java/com/chargebee/v4/services/PurchaseService.java
@@ -5,19 +5,20 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.purchase.params.PurchaseCreateParams;
+import com.chargebee.v4.models.purchase.params.PurchaseCreateParams;
 
-import com.chargebee.v4.core.models.purchase.params.PurchaseEstimateParams;
+import com.chargebee.v4.models.purchase.params.PurchaseEstimateParams;
 
-import com.chargebee.v4.core.responses.purchase.PurchaseCreateResponse;
+import com.chargebee.v4.models.purchase.responses.PurchaseCreateResponse;
 
-import com.chargebee.v4.core.responses.purchase.PurchaseEstimateResponse;
+import com.chargebee.v4.models.purchase.responses.PurchaseEstimateResponse;
 
 public final class PurchaseService extends BaseService<PurchaseService> {
 
@@ -54,36 +55,37 @@ public PurchaseService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** create a purchase using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(PurchaseCreateParams params) throws Exception {
+  Response createRaw(PurchaseCreateParams params) throws ChargebeeException {
 
     return post("/purchases", params != null ? params.toFormData() : null);
   }
 
   /** create a purchase using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/purchases", jsonPayload);
   }
 
-  public PurchaseCreateResponse create(PurchaseCreateParams params) throws Exception {
+  public PurchaseCreateResponse create(PurchaseCreateParams params) throws ChargebeeException {
     Response response = createRaw(params);
 
     return PurchaseCreateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** estimate a purchase using immutable params (executes immediately) - returns raw Response. */
-  Response estimateRaw(PurchaseEstimateParams params) throws Exception {
+  Response estimateRaw(PurchaseEstimateParams params) throws ChargebeeException {
 
     return post("/purchases/estimate", params != null ? params.toFormData() : null);
   }
 
   /** estimate a purchase using raw JSON payload (executes immediately) - returns raw Response. */
-  Response estimateRaw(String jsonPayload) throws Exception {
+  Response estimateRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/purchases/estimate", jsonPayload);
   }
 
-  public PurchaseEstimateResponse estimate(PurchaseEstimateParams params) throws Exception {
+  public PurchaseEstimateResponse estimate(PurchaseEstimateParams params)
+      throws ChargebeeException {
     Response response = estimateRaw(params);
 
     return PurchaseEstimateResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/services/QuoteService.java b/src/main/java/com/chargebee/v4/services/QuoteService.java
new file mode 100644
index 00000000..55676ec8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/QuoteService.java
@@ -0,0 +1,780 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.quote.params.CreateSubscriptionItemsForCustomerQuoteParams;
+
+import com.chargebee.v4.models.quote.params.EditCreateSubscriptionCustomerQuoteForItemsParams;
+
+import com.chargebee.v4.models.quote.params.QuoteUpdateStatusParams;
+
+import com.chargebee.v4.models.quote.params.UpdateSubscriptionQuoteForItemsParams;
+
+import com.chargebee.v4.models.quote.params.QuoteLineGroupsForQuoteParams;
+
+import com.chargebee.v4.models.quote.params.QuoteExtendExpiryDateParams;
+
+import com.chargebee.v4.models.quote.params.QuoteEditForChargeItemsAndChargesParams;
+
+import com.chargebee.v4.models.quote.params.EditUpdateSubscriptionQuoteForItemsParams;
+
+import com.chargebee.v4.models.quote.params.QuoteListParams;
+
+import com.chargebee.v4.models.quote.params.QuotePdfParams;
+
+import com.chargebee.v4.models.quote.params.QuoteConvertParams;
+
+import com.chargebee.v4.models.quote.params.QuoteCreateForChargeItemsAndChargesParams;
+
+import com.chargebee.v4.models.quote.params.QuoteDeleteParams;
+
+import com.chargebee.v4.models.quote.params.EditOneTimeQuoteParams;
+
+import com.chargebee.v4.models.quote.params.UpdateSubscriptionQuoteParams;
+
+import com.chargebee.v4.models.quote.params.QuoteCreateForOnetimeChargesParams;
+
+import com.chargebee.v4.models.quote.params.CreateSubscriptionForCustomerQuoteParams;
+
+import com.chargebee.v4.models.quote.params.EditUpdateSubscriptionQuoteParams;
+
+import com.chargebee.v4.models.quote.params.EditCreateSubscriptionForCustomerQuoteParams;
+
+import com.chargebee.v4.models.quote.responses.CreateSubscriptionItemsForCustomerQuoteResponse;
+
+import com.chargebee.v4.models.quote.responses.QuoteRetrieveResponse;
+
+import com.chargebee.v4.models.quote.responses.EditCreateSubscriptionCustomerQuoteForItemsResponse;
+
+import com.chargebee.v4.models.quote.responses.QuoteUpdateStatusResponse;
+
+import com.chargebee.v4.models.quote.responses.UpdateSubscriptionQuoteForItemsResponse;
+
+import com.chargebee.v4.models.quote.responses.QuoteLineGroupsForQuoteResponse;
+
+import com.chargebee.v4.models.quote.responses.QuoteExtendExpiryDateResponse;
+
+import com.chargebee.v4.models.quote.responses.QuoteEditForChargeItemsAndChargesResponse;
+
+import com.chargebee.v4.models.quote.responses.EditUpdateSubscriptionQuoteForItemsResponse;
+
+import com.chargebee.v4.models.quote.responses.QuoteListResponse;
+
+import com.chargebee.v4.models.quote.responses.QuotePdfResponse;
+
+import com.chargebee.v4.models.quote.responses.QuoteConvertResponse;
+
+import com.chargebee.v4.models.quote.responses.QuoteCreateForChargeItemsAndChargesResponse;
+
+import com.chargebee.v4.models.quote.responses.QuoteDeleteResponse;
+
+import com.chargebee.v4.models.quote.responses.EditOneTimeQuoteResponse;
+
+import com.chargebee.v4.models.quote.responses.UpdateSubscriptionQuoteResponse;
+
+import com.chargebee.v4.models.quote.responses.QuoteCreateForOnetimeChargesResponse;
+
+import com.chargebee.v4.models.quote.responses.CreateSubscriptionForCustomerQuoteResponse;
+
+import com.chargebee.v4.models.quote.responses.EditUpdateSubscriptionQuoteResponse;
+
+import com.chargebee.v4.models.quote.responses.EditCreateSubscriptionForCustomerQuoteResponse;
+
+public final class QuoteService extends BaseService<QuoteService> {
+
+  private final ServiceConfig config;
+
+  public QuoteService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private QuoteService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private QuoteService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  QuoteService with(RequestOptions newOptions) {
+    return new QuoteService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public QuoteService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * createSubscriptionItemsForCustomerQuote a quote (executes immediately) - returns raw Response.
+   */
+  Response createSubscriptionItemsForCustomerQuoteRaw(String customerId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/customers/{customer-id}/create_subscription_quote_for_items",
+            "customer-id",
+            customerId);
+
+    return post(path, null);
+  }
+
+  /**
+   * createSubscriptionItemsForCustomerQuote a quote using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response createSubscriptionItemsForCustomerQuoteRaw(
+      String customerId, CreateSubscriptionItemsForCustomerQuoteParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/customers/{customer-id}/create_subscription_quote_for_items",
+            "customer-id",
+            customerId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * createSubscriptionItemsForCustomerQuote a quote using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response createSubscriptionItemsForCustomerQuoteRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/customers/{customer-id}/create_subscription_quote_for_items",
+            "customer-id",
+            customerId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CreateSubscriptionItemsForCustomerQuoteResponse createSubscriptionItemsForCustomerQuote(
+      String customerId, CreateSubscriptionItemsForCustomerQuoteParams params)
+      throws ChargebeeException {
+    Response response = createSubscriptionItemsForCustomerQuoteRaw(customerId, params);
+    return CreateSubscriptionItemsForCustomerQuoteResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /** retrieve a quote (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String quoteId) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}", "quote-id", quoteId);
+
+    return get(path, null);
+  }
+
+  public QuoteRetrieveResponse retrieve(String quoteId) throws ChargebeeException {
+    Response response = retrieveRaw(quoteId);
+    return QuoteRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * editCreateSubscriptionCustomerQuoteForItems a quote (executes immediately) - returns raw
+   * Response.
+   */
+  Response editCreateSubscriptionCustomerQuoteForItemsRaw(String quoteId)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_create_subscription_quote_for_items", "quote-id", quoteId);
+
+    return post(path, null);
+  }
+
+  /**
+   * editCreateSubscriptionCustomerQuoteForItems a quote using immutable params (executes
+   * immediately) - returns raw Response.
+   */
+  Response editCreateSubscriptionCustomerQuoteForItemsRaw(
+      String quoteId, EditCreateSubscriptionCustomerQuoteForItemsParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_create_subscription_quote_for_items", "quote-id", quoteId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * editCreateSubscriptionCustomerQuoteForItems a quote using raw JSON payload (executes
+   * immediately) - returns raw Response.
+   */
+  Response editCreateSubscriptionCustomerQuoteForItemsRaw(String quoteId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_create_subscription_quote_for_items", "quote-id", quoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public EditCreateSubscriptionCustomerQuoteForItemsResponse
+      editCreateSubscriptionCustomerQuoteForItems(
+          String quoteId, EditCreateSubscriptionCustomerQuoteForItemsParams params)
+          throws ChargebeeException {
+    Response response = editCreateSubscriptionCustomerQuoteForItemsRaw(quoteId, params);
+    return EditCreateSubscriptionCustomerQuoteForItemsResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /** updateStatus a quote (executes immediately) - returns raw Response. */
+  Response updateStatusRaw(String quoteId) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/update_status", "quote-id", quoteId);
+
+    return post(path, null);
+  }
+
+  /** updateStatus a quote using immutable params (executes immediately) - returns raw Response. */
+  Response updateStatusRaw(String quoteId, QuoteUpdateStatusParams params)
+      throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/update_status", "quote-id", quoteId);
+    return post(path, params.toFormData());
+  }
+
+  /** updateStatus a quote using raw JSON payload (executes immediately) - returns raw Response. */
+  Response updateStatusRaw(String quoteId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/update_status", "quote-id", quoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public QuoteUpdateStatusResponse updateStatus(String quoteId, QuoteUpdateStatusParams params)
+      throws ChargebeeException {
+    Response response = updateStatusRaw(quoteId, params);
+    return QuoteUpdateStatusResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * updateSubscriptionQuoteForItems a quote using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response updateSubscriptionQuoteForItemsRaw(UpdateSubscriptionQuoteForItemsParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/quotes/update_subscription_quote_for_items", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * updateSubscriptionQuoteForItems a quote using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response updateSubscriptionQuoteForItemsRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/quotes/update_subscription_quote_for_items", jsonPayload);
+  }
+
+  public UpdateSubscriptionQuoteForItemsResponse updateSubscriptionQuoteForItems(
+      UpdateSubscriptionQuoteForItemsParams params) throws ChargebeeException {
+    Response response = updateSubscriptionQuoteForItemsRaw(params);
+
+    return UpdateSubscriptionQuoteForItemsResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * quoteLineGroupsForQuote a quote using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response quoteLineGroupsForQuoteRaw(String quoteId, QuoteLineGroupsForQuoteParams params)
+      throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/quote_line_groups", "quote-id", quoteId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * quoteLineGroupsForQuote a quote without params (executes immediately) - returns raw Response.
+   */
+  Response quoteLineGroupsForQuoteRaw(String quoteId) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/quote_line_groups", "quote-id", quoteId);
+    return get(path, null);
+  }
+
+  /**
+   * quoteLineGroupsForQuote a quote using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response quoteLineGroupsForQuoteRaw(String quoteId, String jsonPayload)
+      throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/quote_line_groups", "quote-id", quoteId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public QuoteLineGroupsForQuoteResponse quoteLineGroupsForQuote(
+      String quoteId, QuoteLineGroupsForQuoteParams params) throws ChargebeeException {
+    Response response = quoteLineGroupsForQuoteRaw(quoteId, params);
+    return QuoteLineGroupsForQuoteResponse.fromJson(
+        response.getBodyAsString(), this, params, quoteId, response);
+  }
+
+  public QuoteLineGroupsForQuoteResponse quoteLineGroupsForQuote(String quoteId)
+      throws ChargebeeException {
+    Response response = quoteLineGroupsForQuoteRaw(quoteId);
+    return QuoteLineGroupsForQuoteResponse.fromJson(
+        response.getBodyAsString(), this, null, quoteId, response);
+  }
+
+  /** extendExpiryDate a quote (executes immediately) - returns raw Response. */
+  Response extendExpiryDateRaw(String quoteId) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/extend_expiry_date", "quote-id", quoteId);
+
+    return post(path, null);
+  }
+
+  /**
+   * extendExpiryDate a quote using immutable params (executes immediately) - returns raw Response.
+   */
+  Response extendExpiryDateRaw(String quoteId, QuoteExtendExpiryDateParams params)
+      throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/extend_expiry_date", "quote-id", quoteId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * extendExpiryDate a quote using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response extendExpiryDateRaw(String quoteId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/extend_expiry_date", "quote-id", quoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public QuoteExtendExpiryDateResponse extendExpiryDate(
+      String quoteId, QuoteExtendExpiryDateParams params) throws ChargebeeException {
+    Response response = extendExpiryDateRaw(quoteId, params);
+    return QuoteExtendExpiryDateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** editForChargeItemsAndCharges a quote (executes immediately) - returns raw Response. */
+  Response editForChargeItemsAndChargesRaw(String quoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_for_charge_items_and_charges", "quote-id", quoteId);
+
+    return post(path, null);
+  }
+
+  /**
+   * editForChargeItemsAndCharges a quote using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response editForChargeItemsAndChargesRaw(
+      String quoteId, QuoteEditForChargeItemsAndChargesParams params) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_for_charge_items_and_charges", "quote-id", quoteId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * editForChargeItemsAndCharges a quote using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response editForChargeItemsAndChargesRaw(String quoteId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_for_charge_items_and_charges", "quote-id", quoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public QuoteEditForChargeItemsAndChargesResponse editForChargeItemsAndCharges(
+      String quoteId, QuoteEditForChargeItemsAndChargesParams params) throws ChargebeeException {
+    Response response = editForChargeItemsAndChargesRaw(quoteId, params);
+    return QuoteEditForChargeItemsAndChargesResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** editUpdateSubscriptionQuoteForItems a quote (executes immediately) - returns raw Response. */
+  Response editUpdateSubscriptionQuoteForItemsRaw(String quoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_update_subscription_quote_for_items", "quote-id", quoteId);
+
+    return post(path, null);
+  }
+
+  /**
+   * editUpdateSubscriptionQuoteForItems a quote using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response editUpdateSubscriptionQuoteForItemsRaw(
+      String quoteId, EditUpdateSubscriptionQuoteForItemsParams params) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_update_subscription_quote_for_items", "quote-id", quoteId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * editUpdateSubscriptionQuoteForItems a quote using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response editUpdateSubscriptionQuoteForItemsRaw(String quoteId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_update_subscription_quote_for_items", "quote-id", quoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public EditUpdateSubscriptionQuoteForItemsResponse editUpdateSubscriptionQuoteForItems(
+      String quoteId, EditUpdateSubscriptionQuoteForItemsParams params) throws ChargebeeException {
+    Response response = editUpdateSubscriptionQuoteForItemsRaw(quoteId, params);
+    return EditUpdateSubscriptionQuoteForItemsResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /** list a quote using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(QuoteListParams params) throws ChargebeeException {
+
+    return get("/quotes", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a quote without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/quotes", null);
+  }
+
+  /** list a quote using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public QuoteListResponse list(QuoteListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return QuoteListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public QuoteListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return QuoteListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** pdf a quote (executes immediately) - returns raw Response. */
+  Response pdfRaw(String quoteId) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/pdf", "quote-id", quoteId);
+
+    return post(path, null);
+  }
+
+  /** pdf a quote using immutable params (executes immediately) - returns raw Response. */
+  Response pdfRaw(String quoteId, QuotePdfParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/pdf", "quote-id", quoteId);
+    return post(path, params.toFormData());
+  }
+
+  /** pdf a quote using raw JSON payload (executes immediately) - returns raw Response. */
+  Response pdfRaw(String quoteId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/pdf", "quote-id", quoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public QuotePdfResponse pdf(String quoteId, QuotePdfParams params) throws ChargebeeException {
+    Response response = pdfRaw(quoteId, params);
+    return QuotePdfResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** convert a quote (executes immediately) - returns raw Response. */
+  Response convertRaw(String quoteId) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/convert", "quote-id", quoteId);
+
+    return post(path, null);
+  }
+
+  /** convert a quote using immutable params (executes immediately) - returns raw Response. */
+  Response convertRaw(String quoteId, QuoteConvertParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/convert", "quote-id", quoteId);
+    return post(path, params.toFormData());
+  }
+
+  /** convert a quote using raw JSON payload (executes immediately) - returns raw Response. */
+  Response convertRaw(String quoteId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/convert", "quote-id", quoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public QuoteConvertResponse convert(String quoteId, QuoteConvertParams params)
+      throws ChargebeeException {
+    Response response = convertRaw(quoteId, params);
+    return QuoteConvertResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createForChargeItemsAndCharges a quote using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response createForChargeItemsAndChargesRaw(QuoteCreateForChargeItemsAndChargesParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/quotes/create_for_charge_items_and_charges", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createForChargeItemsAndCharges a quote using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response createForChargeItemsAndChargesRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/quotes/create_for_charge_items_and_charges", jsonPayload);
+  }
+
+  public QuoteCreateForChargeItemsAndChargesResponse createForChargeItemsAndCharges(
+      QuoteCreateForChargeItemsAndChargesParams params) throws ChargebeeException {
+    Response response = createForChargeItemsAndChargesRaw(params);
+
+    return QuoteCreateForChargeItemsAndChargesResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /** delete a quote (executes immediately) - returns raw Response. */
+  Response deleteRaw(String quoteId) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/delete", "quote-id", quoteId);
+
+    return post(path, null);
+  }
+
+  /** delete a quote using immutable params (executes immediately) - returns raw Response. */
+  Response deleteRaw(String quoteId, QuoteDeleteParams params) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/delete", "quote-id", quoteId);
+    return post(path, params.toFormData());
+  }
+
+  /** delete a quote using raw JSON payload (executes immediately) - returns raw Response. */
+  Response deleteRaw(String quoteId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/quotes/{quote-id}/delete", "quote-id", quoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public QuoteDeleteResponse delete(String quoteId, QuoteDeleteParams params)
+      throws ChargebeeException {
+    Response response = deleteRaw(quoteId, params);
+    return QuoteDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** editOneTimeQuote a quote (executes immediately) - returns raw Response. */
+  Response editOneTimeQuoteRaw(String quoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/quotes/{quote-id}/edit_one_time_quote", "quote-id", quoteId);
+
+    return post(path, null);
+  }
+
+  /**
+   * editOneTimeQuote a quote using immutable params (executes immediately) - returns raw Response.
+   */
+  Response editOneTimeQuoteRaw(String quoteId, EditOneTimeQuoteParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/quotes/{quote-id}/edit_one_time_quote", "quote-id", quoteId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * editOneTimeQuote a quote using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response editOneTimeQuoteRaw(String quoteId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/quotes/{quote-id}/edit_one_time_quote", "quote-id", quoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public EditOneTimeQuoteResponse editOneTimeQuote(String quoteId, EditOneTimeQuoteParams params)
+      throws ChargebeeException {
+    Response response = editOneTimeQuoteRaw(quoteId, params);
+    return EditOneTimeQuoteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * updateSubscriptionQuote a quote using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response updateSubscriptionQuoteRaw(UpdateSubscriptionQuoteParams params)
+      throws ChargebeeException {
+
+    return post("/quotes/update_subscription_quote", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * updateSubscriptionQuote a quote using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response updateSubscriptionQuoteRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/quotes/update_subscription_quote", jsonPayload);
+  }
+
+  public UpdateSubscriptionQuoteResponse updateSubscriptionQuote(
+      UpdateSubscriptionQuoteParams params) throws ChargebeeException {
+    Response response = updateSubscriptionQuoteRaw(params);
+
+    return UpdateSubscriptionQuoteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createForOnetimeCharges a quote using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response createForOnetimeChargesRaw(QuoteCreateForOnetimeChargesParams params)
+      throws ChargebeeException {
+
+    return post("/quotes/create_for_onetime_charges", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createForOnetimeCharges a quote using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response createForOnetimeChargesRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/quotes/create_for_onetime_charges", jsonPayload);
+  }
+
+  public QuoteCreateForOnetimeChargesResponse createForOnetimeCharges(
+      QuoteCreateForOnetimeChargesParams params) throws ChargebeeException {
+    Response response = createForOnetimeChargesRaw(params);
+
+    return QuoteCreateForOnetimeChargesResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** createSubscriptionForCustomerQuote a quote (executes immediately) - returns raw Response. */
+  Response createSubscriptionForCustomerQuoteRaw(String customerId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/customers/{customer-id}/create_subscription_quote", "customer-id", customerId);
+
+    return post(path, null);
+  }
+
+  /**
+   * createSubscriptionForCustomerQuote a quote using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response createSubscriptionForCustomerQuoteRaw(
+      String customerId, CreateSubscriptionForCustomerQuoteParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/customers/{customer-id}/create_subscription_quote", "customer-id", customerId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * createSubscriptionForCustomerQuote a quote using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response createSubscriptionForCustomerQuoteRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/customers/{customer-id}/create_subscription_quote", "customer-id", customerId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CreateSubscriptionForCustomerQuoteResponse createSubscriptionForCustomerQuote(
+      String customerId, CreateSubscriptionForCustomerQuoteParams params)
+      throws ChargebeeException {
+    Response response = createSubscriptionForCustomerQuoteRaw(customerId, params);
+    return CreateSubscriptionForCustomerQuoteResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /** editUpdateSubscriptionQuote a quote (executes immediately) - returns raw Response. */
+  Response editUpdateSubscriptionQuoteRaw(String quoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_update_subscription_quote", "quote-id", quoteId);
+
+    return post(path, null);
+  }
+
+  /**
+   * editUpdateSubscriptionQuote a quote using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response editUpdateSubscriptionQuoteRaw(String quoteId, EditUpdateSubscriptionQuoteParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_update_subscription_quote", "quote-id", quoteId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * editUpdateSubscriptionQuote a quote using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response editUpdateSubscriptionQuoteRaw(String quoteId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_update_subscription_quote", "quote-id", quoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public EditUpdateSubscriptionQuoteResponse editUpdateSubscriptionQuote(
+      String quoteId, EditUpdateSubscriptionQuoteParams params) throws ChargebeeException {
+    Response response = editUpdateSubscriptionQuoteRaw(quoteId, params);
+    return EditUpdateSubscriptionQuoteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * editCreateSubscriptionForCustomerQuote a quote (executes immediately) - returns raw Response.
+   */
+  Response editCreateSubscriptionForCustomerQuoteRaw(String quoteId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_create_subscription_quote", "quote-id", quoteId);
+
+    return post(path, null);
+  }
+
+  /**
+   * editCreateSubscriptionForCustomerQuote a quote using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response editCreateSubscriptionForCustomerQuoteRaw(
+      String quoteId, EditCreateSubscriptionForCustomerQuoteParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_create_subscription_quote", "quote-id", quoteId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * editCreateSubscriptionForCustomerQuote a quote using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response editCreateSubscriptionForCustomerQuoteRaw(String quoteId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/quotes/{quote-id}/edit_create_subscription_quote", "quote-id", quoteId);
+    return postJson(path, jsonPayload);
+  }
+
+  public EditCreateSubscriptionForCustomerQuoteResponse editCreateSubscriptionForCustomerQuote(
+      String quoteId, EditCreateSubscriptionForCustomerQuoteParams params)
+      throws ChargebeeException {
+    Response response = editCreateSubscriptionForCustomerQuoteRaw(quoteId, params);
+    return EditCreateSubscriptionForCustomerQuoteResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/RampService.java b/src/main/java/com/chargebee/v4/services/RampService.java
similarity index 75%
rename from src/main/java/com/chargebee/v4/core/services/RampService.java
rename to src/main/java/com/chargebee/v4/services/RampService.java
index 0f4b85d2..cf98a6f6 100644
--- a/src/main/java/com/chargebee/v4/core/services/RampService.java
+++ b/src/main/java/com/chargebee/v4/services/RampService.java
@@ -5,27 +5,28 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.ramp.params.RampCreateForSubscriptionParams;
+import com.chargebee.v4.models.ramp.params.RampCreateForSubscriptionParams;
 
-import com.chargebee.v4.core.models.ramp.params.RampListParams;
+import com.chargebee.v4.models.ramp.params.RampListParams;
 
-import com.chargebee.v4.core.models.ramp.params.RampUpdateParams;
+import com.chargebee.v4.models.ramp.params.RampUpdateParams;
 
-import com.chargebee.v4.core.responses.ramp.RampRetrieveResponse;
+import com.chargebee.v4.models.ramp.responses.RampRetrieveResponse;
 
-import com.chargebee.v4.core.responses.ramp.RampCreateForSubscriptionResponse;
+import com.chargebee.v4.models.ramp.responses.RampCreateForSubscriptionResponse;
 
-import com.chargebee.v4.core.responses.ramp.RampListResponse;
+import com.chargebee.v4.models.ramp.responses.RampListResponse;
 
-import com.chargebee.v4.core.responses.ramp.RampUpdateResponse;
+import com.chargebee.v4.models.ramp.responses.RampUpdateResponse;
 
-import com.chargebee.v4.core.responses.ramp.RampDeleteResponse;
+import com.chargebee.v4.models.ramp.responses.RampDeleteResponse;
 
 public final class RampService extends BaseService<RampService> {
 
@@ -62,19 +63,19 @@ public RampService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** retrieve a ramp (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String rampId) throws Exception {
+  Response retrieveRaw(String rampId) throws ChargebeeException {
     String path = buildPathWithParams("/ramps/{ramp-id}", "ramp-id", rampId);
 
     return get(path, null);
   }
 
-  public RampRetrieveResponse retrieve(String rampId) throws Exception {
+  public RampRetrieveResponse retrieve(String rampId) throws ChargebeeException {
     Response response = retrieveRaw(rampId);
     return RampRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** createForSubscription a ramp (executes immediately) - returns raw Response. */
-  Response createForSubscriptionRaw(String subscriptionId) throws Exception {
+  Response createForSubscriptionRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/create_ramp", "subscription-id", subscriptionId);
@@ -87,7 +88,7 @@ Response createForSubscriptionRaw(String subscriptionId) throws Exception {
    * Response.
    */
   Response createForSubscriptionRaw(String subscriptionId, RampCreateForSubscriptionParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/create_ramp", "subscription-id", subscriptionId);
@@ -98,7 +99,8 @@ Response createForSubscriptionRaw(String subscriptionId, RampCreateForSubscripti
    * createForSubscription a ramp using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response createForSubscriptionRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response createForSubscriptionRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/create_ramp", "subscription-id", subscriptionId);
@@ -106,72 +108,73 @@ Response createForSubscriptionRaw(String subscriptionId, String jsonPayload) thr
   }
 
   public RampCreateForSubscriptionResponse createForSubscription(
-      String subscriptionId, RampCreateForSubscriptionParams params) throws Exception {
+      String subscriptionId, RampCreateForSubscriptionParams params) throws ChargebeeException {
     Response response = createForSubscriptionRaw(subscriptionId, params);
     return RampCreateForSubscriptionResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** list a ramp using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(RampListParams params) throws Exception {
+  Response listRaw(RampListParams params) throws ChargebeeException {
 
     return get("/ramps", params != null ? params.toQueryParams() : null);
   }
 
   /** list a ramp without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/ramps", null);
   }
 
   /** list a ramp using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public RampListResponse list(RampListParams params) throws Exception {
+  public RampListResponse list(RampListParams params) throws ChargebeeException {
     Response response = listRaw(params);
 
     return RampListResponse.fromJson(response.getBodyAsString(), this, params, response);
   }
 
-  public RampListResponse list() throws Exception {
+  public RampListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return RampListResponse.fromJson(response.getBodyAsString(), this, null, response);
   }
 
   /** update a ramp (executes immediately) - returns raw Response. */
-  Response updateRaw(String rampId) throws Exception {
+  Response updateRaw(String rampId) throws ChargebeeException {
     String path = buildPathWithParams("/ramps/{ramp-id}/update", "ramp-id", rampId);
 
     return post(path, null);
   }
 
   /** update a ramp using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String rampId, RampUpdateParams params) throws Exception {
+  Response updateRaw(String rampId, RampUpdateParams params) throws ChargebeeException {
     String path = buildPathWithParams("/ramps/{ramp-id}/update", "ramp-id", rampId);
     return post(path, params.toFormData());
   }
 
   /** update a ramp using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String rampId, String jsonPayload) throws Exception {
+  Response updateRaw(String rampId, String jsonPayload) throws ChargebeeException {
     String path = buildPathWithParams("/ramps/{ramp-id}/update", "ramp-id", rampId);
     return postJson(path, jsonPayload);
   }
 
-  public RampUpdateResponse update(String rampId, RampUpdateParams params) throws Exception {
+  public RampUpdateResponse update(String rampId, RampUpdateParams params)
+      throws ChargebeeException {
     Response response = updateRaw(rampId, params);
     return RampUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** delete a ramp (executes immediately) - returns raw Response. */
-  Response deleteRaw(String rampId) throws Exception {
+  Response deleteRaw(String rampId) throws ChargebeeException {
     String path = buildPathWithParams("/ramps/{ramp-id}/delete", "ramp-id", rampId);
 
     return post(path, null);
   }
 
-  public RampDeleteResponse delete(String rampId) throws Exception {
+  public RampDeleteResponse delete(String rampId) throws ChargebeeException {
     Response response = deleteRaw(rampId);
     return RampDeleteResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/core/services/RecordedPurchaseService.java b/src/main/java/com/chargebee/v4/services/RecordedPurchaseService.java
similarity index 81%
rename from src/main/java/com/chargebee/v4/core/services/RecordedPurchaseService.java
rename to src/main/java/com/chargebee/v4/services/RecordedPurchaseService.java
index 32492369..67b65fe9 100644
--- a/src/main/java/com/chargebee/v4/core/services/RecordedPurchaseService.java
+++ b/src/main/java/com/chargebee/v4/services/RecordedPurchaseService.java
@@ -5,17 +5,18 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.recordedPurchase.params.RecordedPurchaseCreateParams;
+import com.chargebee.v4.models.recordedPurchase.params.RecordedPurchaseCreateParams;
 
-import com.chargebee.v4.core.responses.recordedPurchase.RecordedPurchaseRetrieveResponse;
+import com.chargebee.v4.models.recordedPurchase.responses.RecordedPurchaseRetrieveResponse;
 
-import com.chargebee.v4.core.responses.recordedPurchase.RecordedPurchaseCreateResponse;
+import com.chargebee.v4.models.recordedPurchase.responses.RecordedPurchaseCreateResponse;
 
 public final class RecordedPurchaseService extends BaseService<RecordedPurchaseService> {
 
@@ -53,7 +54,7 @@ public RecordedPurchaseService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** retrieve a recordedPurchase (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String recordedPurchaseId) throws Exception {
+  Response retrieveRaw(String recordedPurchaseId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/recorded_purchases/{recorded-purchase-id}",
@@ -63,7 +64,8 @@ Response retrieveRaw(String recordedPurchaseId) throws Exception {
     return get(path, null);
   }
 
-  public RecordedPurchaseRetrieveResponse retrieve(String recordedPurchaseId) throws Exception {
+  public RecordedPurchaseRetrieveResponse retrieve(String recordedPurchaseId)
+      throws ChargebeeException {
     Response response = retrieveRaw(recordedPurchaseId);
     return RecordedPurchaseRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
@@ -71,7 +73,7 @@ public RecordedPurchaseRetrieveResponse retrieve(String recordedPurchaseId) thro
   /**
    * create a recordedPurchase using immutable params (executes immediately) - returns raw Response.
    */
-  Response createRaw(RecordedPurchaseCreateParams params) throws Exception {
+  Response createRaw(RecordedPurchaseCreateParams params) throws ChargebeeException {
 
     return post("/recorded_purchases", params != null ? params.toFormData() : null);
   }
@@ -79,13 +81,13 @@ Response createRaw(RecordedPurchaseCreateParams params) throws Exception {
   /**
    * create a recordedPurchase using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/recorded_purchases", jsonPayload);
   }
 
   public RecordedPurchaseCreateResponse create(RecordedPurchaseCreateParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = createRaw(params);
 
     return RecordedPurchaseCreateResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/core/services/ResourceMigrationService.java b/src/main/java/com/chargebee/v4/services/ResourceMigrationService.java
similarity index 81%
rename from src/main/java/com/chargebee/v4/core/services/ResourceMigrationService.java
rename to src/main/java/com/chargebee/v4/services/ResourceMigrationService.java
index e7072926..19a552d5 100644
--- a/src/main/java/com/chargebee/v4/core/services/ResourceMigrationService.java
+++ b/src/main/java/com/chargebee/v4/services/ResourceMigrationService.java
@@ -5,15 +5,16 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.resourceMigration.params.ResourceMigrationRetrieveLatestParams;
+import com.chargebee.v4.models.resourceMigration.params.ResourceMigrationRetrieveLatestParams;
 
-import com.chargebee.v4.core.responses.resourceMigration.ResourceMigrationRetrieveLatestResponse;
+import com.chargebee.v4.models.resourceMigration.responses.ResourceMigrationRetrieveLatestResponse;
 
 public final class ResourceMigrationService extends BaseService<ResourceMigrationService> {
 
@@ -54,7 +55,8 @@ public ResourceMigrationService withOptions(RequestOptions options) {
    * retrieveLatest a resourceMigration using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveLatestRaw(ResourceMigrationRetrieveLatestParams params) throws Exception {
+  Response retrieveLatestRaw(ResourceMigrationRetrieveLatestParams params)
+      throws ChargebeeException {
 
     return get(
         "/resource_migrations/retrieve_latest", params != null ? params.toQueryParams() : null);
@@ -64,13 +66,13 @@ Response retrieveLatestRaw(ResourceMigrationRetrieveLatestParams params) throws
    * retrieveLatest a resourceMigration using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveLatestRaw(String jsonPayload) throws Exception {
+  Response retrieveLatestRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public ResourceMigrationRetrieveLatestResponse retrieveLatest(
-      ResourceMigrationRetrieveLatestParams params) throws Exception {
+      ResourceMigrationRetrieveLatestParams params) throws ChargebeeException {
     Response response = retrieveLatestRaw(params);
 
     return ResourceMigrationRetrieveLatestResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/core/services/RuleService.java b/src/main/java/com/chargebee/v4/services/RuleService.java
similarity index 83%
rename from src/main/java/com/chargebee/v4/core/services/RuleService.java
rename to src/main/java/com/chargebee/v4/services/RuleService.java
index b155ed87..3b774961 100644
--- a/src/main/java/com/chargebee/v4/core/services/RuleService.java
+++ b/src/main/java/com/chargebee/v4/services/RuleService.java
@@ -5,13 +5,14 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.responses.rule.RuleRetrieveResponse;
+import com.chargebee.v4.models.rule.responses.RuleRetrieveResponse;
 
 public final class RuleService extends BaseService<RuleService> {
 
@@ -48,13 +49,13 @@ public RuleService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** retrieve a rule (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String ruleId) throws Exception {
+  Response retrieveRaw(String ruleId) throws ChargebeeException {
     String path = buildPathWithParams("/rules/{rule-id}", "rule-id", ruleId);
 
     return get(path, null);
   }
 
-  public RuleRetrieveResponse retrieve(String ruleId) throws Exception {
+  public RuleRetrieveResponse retrieve(String ruleId) throws ChargebeeException {
     Response response = retrieveRaw(ruleId);
     return RuleRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/core/services/ServiceConfig.java b/src/main/java/com/chargebee/v4/services/ServiceConfig.java
similarity index 97%
rename from src/main/java/com/chargebee/v4/core/services/ServiceConfig.java
rename to src/main/java/com/chargebee/v4/services/ServiceConfig.java
index 8701800c..cb643790 100644
--- a/src/main/java/com/chargebee/v4/core/services/ServiceConfig.java
+++ b/src/main/java/com/chargebee/v4/services/ServiceConfig.java
@@ -1,4 +1,4 @@
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 /**
  * Configuration object for service behavior options.
diff --git a/src/main/java/com/chargebee/v4/core/services/SiteMigrationDetailService.java b/src/main/java/com/chargebee/v4/services/SiteMigrationDetailService.java
similarity index 83%
rename from src/main/java/com/chargebee/v4/core/services/SiteMigrationDetailService.java
rename to src/main/java/com/chargebee/v4/services/SiteMigrationDetailService.java
index 4e1659c5..01f25bf1 100644
--- a/src/main/java/com/chargebee/v4/core/services/SiteMigrationDetailService.java
+++ b/src/main/java/com/chargebee/v4/services/SiteMigrationDetailService.java
@@ -5,15 +5,16 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.siteMigrationDetail.params.SiteMigrationDetailListParams;
+import com.chargebee.v4.models.siteMigrationDetail.params.SiteMigrationDetailListParams;
 
-import com.chargebee.v4.core.responses.siteMigrationDetail.SiteMigrationDetailListResponse;
+import com.chargebee.v4.models.siteMigrationDetail.responses.SiteMigrationDetailListResponse;
 
 public final class SiteMigrationDetailService extends BaseService<SiteMigrationDetailService> {
 
@@ -54,13 +55,13 @@ public SiteMigrationDetailService withOptions(RequestOptions options) {
    * list a siteMigrationDetail using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response listRaw(SiteMigrationDetailListParams params) throws Exception {
+  Response listRaw(SiteMigrationDetailListParams params) throws ChargebeeException {
 
     return get("/site_migration_details", params != null ? params.toQueryParams() : null);
   }
 
   /** list a siteMigrationDetail without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/site_migration_details", null);
   }
@@ -69,20 +70,20 @@ Response listRaw() throws Exception {
    * list a siteMigrationDetail using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public SiteMigrationDetailListResponse list(SiteMigrationDetailListParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = listRaw(params);
 
     return SiteMigrationDetailListResponse.fromJson(
         response.getBodyAsString(), this, params, response);
   }
 
-  public SiteMigrationDetailListResponse list() throws Exception {
+  public SiteMigrationDetailListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return SiteMigrationDetailListResponse.fromJson(
         response.getBodyAsString(), this, null, response);
diff --git a/src/main/java/com/chargebee/v4/services/SubscriptionEntitlementService.java b/src/main/java/com/chargebee/v4/services/SubscriptionEntitlementService.java
new file mode 100644
index 00000000..ef765657
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/SubscriptionEntitlementService.java
@@ -0,0 +1,168 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.subscriptionEntitlement.params.SetSubscriptionEntitlementAvailabilityParams;
+
+import com.chargebee.v4.models.subscriptionEntitlement.params.SubscriptionEntitlementsForSubscriptionParams;
+
+import com.chargebee.v4.models.subscriptionEntitlement.responses.SetSubscriptionEntitlementAvailabilityResponse;
+
+import com.chargebee.v4.models.subscriptionEntitlement.responses.SubscriptionEntitlementsForSubscriptionResponse;
+
+public final class SubscriptionEntitlementService
+    extends BaseService<SubscriptionEntitlementService> {
+
+  private final ServiceConfig config;
+
+  public SubscriptionEntitlementService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private SubscriptionEntitlementService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private SubscriptionEntitlementService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  SubscriptionEntitlementService with(RequestOptions newOptions) {
+    return new SubscriptionEntitlementService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public SubscriptionEntitlementService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * setSubscriptionEntitlementAvailability a subscriptionEntitlement (executes immediately) -
+   * returns raw Response.
+   */
+  Response setSubscriptionEntitlementAvailabilityRaw(String subscriptionId)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/subscription_entitlements/set_availability",
+            "subscription-id",
+            subscriptionId);
+
+    return post(path, null);
+  }
+
+  /**
+   * setSubscriptionEntitlementAvailability a subscriptionEntitlement using immutable params
+   * (executes immediately) - returns raw Response.
+   */
+  Response setSubscriptionEntitlementAvailabilityRaw(
+      String subscriptionId, SetSubscriptionEntitlementAvailabilityParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/subscription_entitlements/set_availability",
+            "subscription-id",
+            subscriptionId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * setSubscriptionEntitlementAvailability a subscriptionEntitlement using raw JSON payload
+   * (executes immediately) - returns raw Response.
+   */
+  Response setSubscriptionEntitlementAvailabilityRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/subscription_entitlements/set_availability",
+            "subscription-id",
+            subscriptionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public SetSubscriptionEntitlementAvailabilityResponse setSubscriptionEntitlementAvailability(
+      String subscriptionId, SetSubscriptionEntitlementAvailabilityParams params)
+      throws ChargebeeException {
+    Response response = setSubscriptionEntitlementAvailabilityRaw(subscriptionId, params);
+    return SetSubscriptionEntitlementAvailabilityResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /**
+   * subscriptionEntitlementsForSubscription a subscriptionEntitlement using immutable params
+   * (executes immediately) - returns raw Response.
+   */
+  Response subscriptionEntitlementsForSubscriptionRaw(
+      String subscriptionId, SubscriptionEntitlementsForSubscriptionParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/subscription_entitlements",
+            "subscription-id",
+            subscriptionId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * subscriptionEntitlementsForSubscription a subscriptionEntitlement without params (executes
+   * immediately) - returns raw Response.
+   */
+  Response subscriptionEntitlementsForSubscriptionRaw(String subscriptionId)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/subscription_entitlements",
+            "subscription-id",
+            subscriptionId);
+    return get(path, null);
+  }
+
+  /**
+   * subscriptionEntitlementsForSubscription a subscriptionEntitlement using raw JSON payload
+   * (executes immediately) - returns raw Response.
+   */
+  Response subscriptionEntitlementsForSubscriptionRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/subscription_entitlements",
+            "subscription-id",
+            subscriptionId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public SubscriptionEntitlementsForSubscriptionResponse subscriptionEntitlementsForSubscription(
+      String subscriptionId, SubscriptionEntitlementsForSubscriptionParams params)
+      throws ChargebeeException {
+    Response response = subscriptionEntitlementsForSubscriptionRaw(subscriptionId, params);
+    return SubscriptionEntitlementsForSubscriptionResponse.fromJson(
+        response.getBodyAsString(), this, params, subscriptionId, response);
+  }
+
+  public SubscriptionEntitlementsForSubscriptionResponse subscriptionEntitlementsForSubscription(
+      String subscriptionId) throws ChargebeeException {
+    Response response = subscriptionEntitlementsForSubscriptionRaw(subscriptionId);
+    return SubscriptionEntitlementsForSubscriptionResponse.fromJson(
+        response.getBodyAsString(), this, null, subscriptionId, response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/SubscriptionService.java b/src/main/java/com/chargebee/v4/services/SubscriptionService.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/services/SubscriptionService.java
rename to src/main/java/com/chargebee/v4/services/SubscriptionService.java
index e6153b6c..3d0b726b 100644
--- a/src/main/java/com/chargebee/v4/core/services/SubscriptionService.java
+++ b/src/main/java/com/chargebee/v4/services/SubscriptionService.java
@@ -5,145 +5,146 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionRemoveAdvanceInvoiceScheduleParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionRemoveAdvanceInvoiceScheduleParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionUpdateForItemsParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionUpdateForItemsParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionRemoveCouponsParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionRemoveCouponsParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionResumeParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionResumeParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionCancelForItemsParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionCancelForItemsParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionRegenerateInvoiceParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionRegenerateInvoiceParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionListParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionListParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionCreateParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionCreateParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionMoveParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionMoveParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionSubscriptionsForCustomerParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionsForCustomerParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionCreateForCustomerParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionCreateForCustomerParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionImportForItemsParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionImportForItemsParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionRemoveScheduledCancellationParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionRemoveScheduledCancellationParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionReactivateParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionReactivateParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionChargeFutureRenewalsParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionChargeFutureRenewalsParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionAddChargeAtTermEndParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionAddChargeAtTermEndParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionChangeTermEndParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionChangeTermEndParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionCreateWithItemsParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionCreateWithItemsParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionImportUnbilledChargesParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionImportUnbilledChargesParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionUpdateParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionUpdateParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionImportContractTermParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionImportContractTermParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionOverrideBillingProfileParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionOverrideBillingProfileParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionEditAdvanceInvoiceScheduleParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionEditAdvanceInvoiceScheduleParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionListDiscountsParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionListDiscountsParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionContractTermsForSubscriptionParams;
+import com.chargebee.v4.models.subscription.params.ContractTermsForSubscriptionParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionPauseParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionPauseParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionImportForCustomerParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionImportForCustomerParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionImportSubscriptionParams;
+import com.chargebee.v4.models.subscription.params.ImportSubscriptionParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionCancelParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionCancelParams;
 
-import com.chargebee.v4.core.models.subscription.params.SubscriptionChargeAddonAtTermEndParams;
+import com.chargebee.v4.models.subscription.params.SubscriptionChargeAddonAtTermEndParams;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionRemoveAdvanceInvoiceScheduleResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionRemoveAdvanceInvoiceScheduleResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionUpdateForItemsResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionUpdateForItemsResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionRemoveCouponsResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionRemoveCouponsResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionResumeResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionResumeResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionCancelForItemsResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionCancelForItemsResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionRegenerateInvoiceResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionRegenerateInvoiceResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionListResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionListResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionCreateResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionCreateResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionMoveResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionMoveResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionSubscriptionsForCustomerResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionsForCustomerResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionCreateForCustomerResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionCreateForCustomerResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionImportForItemsResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionImportForItemsResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionRetrieveAdvanceInvoiceScheduleResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionRetrieveAdvanceInvoiceScheduleResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionRemoveScheduledCancellationResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionRemoveScheduledCancellationResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionRetrieveWithScheduledChangesResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionRetrieveWithScheduledChangesResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionReactivateResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionReactivateResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionChargeFutureRenewalsResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionChargeFutureRenewalsResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionAddChargeAtTermEndResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionAddChargeAtTermEndResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionRemoveScheduledChangesResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionRemoveScheduledChangesResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionChangeTermEndResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionChangeTermEndResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionDeleteResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionDeleteResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionCreateWithItemsResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionCreateWithItemsResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionImportUnbilledChargesResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionImportUnbilledChargesResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionRemoveScheduledResumptionResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionRemoveScheduledResumptionResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionRetrieveResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionRetrieveResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionUpdateResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionUpdateResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionImportContractTermResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionImportContractTermResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionOverrideBillingProfileResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionOverrideBillingProfileResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionRemoveScheduledPauseResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionRemoveScheduledPauseResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionEditAdvanceInvoiceScheduleResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionEditAdvanceInvoiceScheduleResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionListDiscountsResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionListDiscountsResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionContractTermsForSubscriptionResponse;
+import com.chargebee.v4.models.subscription.responses.ContractTermsForSubscriptionResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionPauseResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionPauseResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionImportForCustomerResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionImportForCustomerResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionImportSubscriptionResponse;
+import com.chargebee.v4.models.subscription.responses.ImportSubscriptionResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionCancelResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionCancelResponse;
 
-import com.chargebee.v4.core.responses.subscription.SubscriptionChargeAddonAtTermEndResponse;
+import com.chargebee.v4.models.subscription.responses.SubscriptionChargeAddonAtTermEndResponse;
 
 public final class SubscriptionService extends BaseService<SubscriptionService> {
 
@@ -181,7 +182,7 @@ public SubscriptionService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** removeAdvanceInvoiceSchedule a subscription (executes immediately) - returns raw Response. */
-  Response removeAdvanceInvoiceScheduleRaw(String subscriptionId) throws Exception {
+  Response removeAdvanceInvoiceScheduleRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/remove_advance_invoice_schedule",
@@ -197,7 +198,7 @@ Response removeAdvanceInvoiceScheduleRaw(String subscriptionId) throws Exception
    */
   Response removeAdvanceInvoiceScheduleRaw(
       String subscriptionId, SubscriptionRemoveAdvanceInvoiceScheduleParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/remove_advance_invoice_schedule",
@@ -211,7 +212,7 @@ Response removeAdvanceInvoiceScheduleRaw(
    * returns raw Response.
    */
   Response removeAdvanceInvoiceScheduleRaw(String subscriptionId, String jsonPayload)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/remove_advance_invoice_schedule",
@@ -222,14 +223,14 @@ Response removeAdvanceInvoiceScheduleRaw(String subscriptionId, String jsonPaylo
 
   public SubscriptionRemoveAdvanceInvoiceScheduleResponse removeAdvanceInvoiceSchedule(
       String subscriptionId, SubscriptionRemoveAdvanceInvoiceScheduleParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = removeAdvanceInvoiceScheduleRaw(subscriptionId, params);
     return SubscriptionRemoveAdvanceInvoiceScheduleResponse.fromJson(
         response.getBodyAsString(), response);
   }
 
   /** updateForItems a subscription (executes immediately) - returns raw Response. */
-  Response updateForItemsRaw(String subscriptionId) throws Exception {
+  Response updateForItemsRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/update_for_items", "subscription-id", subscriptionId);
@@ -242,7 +243,7 @@ Response updateForItemsRaw(String subscriptionId) throws Exception {
    * Response.
    */
   Response updateForItemsRaw(String subscriptionId, SubscriptionUpdateForItemsParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/update_for_items", "subscription-id", subscriptionId);
@@ -253,7 +254,7 @@ Response updateForItemsRaw(String subscriptionId, SubscriptionUpdateForItemsPara
    * updateForItems a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response updateForItemsRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response updateForItemsRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/update_for_items", "subscription-id", subscriptionId);
@@ -261,13 +262,13 @@ Response updateForItemsRaw(String subscriptionId, String jsonPayload) throws Exc
   }
 
   public SubscriptionUpdateForItemsResponse updateForItems(
-      String subscriptionId, SubscriptionUpdateForItemsParams params) throws Exception {
+      String subscriptionId, SubscriptionUpdateForItemsParams params) throws ChargebeeException {
     Response response = updateForItemsRaw(subscriptionId, params);
     return SubscriptionUpdateForItemsResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** removeCoupons a subscription (executes immediately) - returns raw Response. */
-  Response removeCouponsRaw(String subscriptionId) throws Exception {
+  Response removeCouponsRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/remove_coupons", "subscription-id", subscriptionId);
@@ -280,7 +281,7 @@ Response removeCouponsRaw(String subscriptionId) throws Exception {
    * Response.
    */
   Response removeCouponsRaw(String subscriptionId, SubscriptionRemoveCouponsParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/remove_coupons", "subscription-id", subscriptionId);
@@ -291,7 +292,7 @@ Response removeCouponsRaw(String subscriptionId, SubscriptionRemoveCouponsParams
    * removeCoupons a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response removeCouponsRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response removeCouponsRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/remove_coupons", "subscription-id", subscriptionId);
@@ -299,13 +300,13 @@ Response removeCouponsRaw(String subscriptionId, String jsonPayload) throws Exce
   }
 
   public SubscriptionRemoveCouponsResponse removeCoupons(
-      String subscriptionId, SubscriptionRemoveCouponsParams params) throws Exception {
+      String subscriptionId, SubscriptionRemoveCouponsParams params) throws ChargebeeException {
     Response response = removeCouponsRaw(subscriptionId, params);
     return SubscriptionRemoveCouponsResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** resume a subscription (executes immediately) - returns raw Response. */
-  Response resumeRaw(String subscriptionId) throws Exception {
+  Response resumeRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/resume", "subscription-id", subscriptionId);
@@ -314,7 +315,8 @@ Response resumeRaw(String subscriptionId) throws Exception {
   }
 
   /** resume a subscription using immutable params (executes immediately) - returns raw Response. */
-  Response resumeRaw(String subscriptionId, SubscriptionResumeParams params) throws Exception {
+  Response resumeRaw(String subscriptionId, SubscriptionResumeParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/resume", "subscription-id", subscriptionId);
@@ -322,7 +324,7 @@ Response resumeRaw(String subscriptionId, SubscriptionResumeParams params) throw
   }
 
   /** resume a subscription using raw JSON payload (executes immediately) - returns raw Response. */
-  Response resumeRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response resumeRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/resume", "subscription-id", subscriptionId);
@@ -330,13 +332,13 @@ Response resumeRaw(String subscriptionId, String jsonPayload) throws Exception {
   }
 
   public SubscriptionResumeResponse resume(String subscriptionId, SubscriptionResumeParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = resumeRaw(subscriptionId, params);
     return SubscriptionResumeResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** cancelForItems a subscription (executes immediately) - returns raw Response. */
-  Response cancelForItemsRaw(String subscriptionId) throws Exception {
+  Response cancelForItemsRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/cancel_for_items", "subscription-id", subscriptionId);
@@ -349,7 +351,7 @@ Response cancelForItemsRaw(String subscriptionId) throws Exception {
    * Response.
    */
   Response cancelForItemsRaw(String subscriptionId, SubscriptionCancelForItemsParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/cancel_for_items", "subscription-id", subscriptionId);
@@ -360,7 +362,7 @@ Response cancelForItemsRaw(String subscriptionId, SubscriptionCancelForItemsPara
    * cancelForItems a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response cancelForItemsRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response cancelForItemsRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/cancel_for_items", "subscription-id", subscriptionId);
@@ -368,13 +370,13 @@ Response cancelForItemsRaw(String subscriptionId, String jsonPayload) throws Exc
   }
 
   public SubscriptionCancelForItemsResponse cancelForItems(
-      String subscriptionId, SubscriptionCancelForItemsParams params) throws Exception {
+      String subscriptionId, SubscriptionCancelForItemsParams params) throws ChargebeeException {
     Response response = cancelForItemsRaw(subscriptionId, params);
     return SubscriptionCancelForItemsResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** regenerateInvoice a subscription (executes immediately) - returns raw Response. */
-  Response regenerateInvoiceRaw(String subscriptionId) throws Exception {
+  Response regenerateInvoiceRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/regenerate_invoice",
@@ -389,7 +391,7 @@ Response regenerateInvoiceRaw(String subscriptionId) throws Exception {
    * Response.
    */
   Response regenerateInvoiceRaw(String subscriptionId, SubscriptionRegenerateInvoiceParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/regenerate_invoice",
@@ -402,7 +404,8 @@ Response regenerateInvoiceRaw(String subscriptionId, SubscriptionRegenerateInvoi
    * regenerateInvoice a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response regenerateInvoiceRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response regenerateInvoiceRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/regenerate_invoice",
@@ -412,60 +415,61 @@ Response regenerateInvoiceRaw(String subscriptionId, String jsonPayload) throws
   }
 
   public SubscriptionRegenerateInvoiceResponse regenerateInvoice(
-      String subscriptionId, SubscriptionRegenerateInvoiceParams params) throws Exception {
+      String subscriptionId, SubscriptionRegenerateInvoiceParams params) throws ChargebeeException {
     Response response = regenerateInvoiceRaw(subscriptionId, params);
     return SubscriptionRegenerateInvoiceResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** list a subscription using immutable params (executes immediately) - returns raw Response. */
-  Response listRaw(SubscriptionListParams params) throws Exception {
+  Response listRaw(SubscriptionListParams params) throws ChargebeeException {
 
     return get("/subscriptions", params != null ? params.toQueryParams() : null);
   }
 
   /** list a subscription without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/subscriptions", null);
   }
 
   /** list a subscription using raw JSON payload (executes immediately) - returns raw Response. */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public SubscriptionListResponse list(SubscriptionListParams params) throws Exception {
+  public SubscriptionListResponse list(SubscriptionListParams params) throws ChargebeeException {
     Response response = listRaw(params);
 
     return SubscriptionListResponse.fromJson(response.getBodyAsString(), this, params, response);
   }
 
-  public SubscriptionListResponse list() throws Exception {
+  public SubscriptionListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return SubscriptionListResponse.fromJson(response.getBodyAsString(), this, null, response);
   }
 
   /** create a subscription using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(SubscriptionCreateParams params) throws Exception {
+  Response createRaw(SubscriptionCreateParams params) throws ChargebeeException {
 
     return post("/subscriptions", params != null ? params.toFormData() : null);
   }
 
   /** create a subscription using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/subscriptions", jsonPayload);
   }
 
-  public SubscriptionCreateResponse create(SubscriptionCreateParams params) throws Exception {
+  public SubscriptionCreateResponse create(SubscriptionCreateParams params)
+      throws ChargebeeException {
     Response response = createRaw(params);
 
     return SubscriptionCreateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** move a subscription (executes immediately) - returns raw Response. */
-  Response moveRaw(String subscriptionId) throws Exception {
+  Response moveRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/move", "subscription-id", subscriptionId);
@@ -474,7 +478,7 @@ Response moveRaw(String subscriptionId) throws Exception {
   }
 
   /** move a subscription using immutable params (executes immediately) - returns raw Response. */
-  Response moveRaw(String subscriptionId, SubscriptionMoveParams params) throws Exception {
+  Response moveRaw(String subscriptionId, SubscriptionMoveParams params) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/move", "subscription-id", subscriptionId);
@@ -482,7 +486,7 @@ Response moveRaw(String subscriptionId, SubscriptionMoveParams params) throws Ex
   }
 
   /** move a subscription using raw JSON payload (executes immediately) - returns raw Response. */
-  Response moveRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response moveRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/move", "subscription-id", subscriptionId);
@@ -490,7 +494,7 @@ Response moveRaw(String subscriptionId, String jsonPayload) throws Exception {
   }
 
   public SubscriptionMoveResponse move(String subscriptionId, SubscriptionMoveParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = moveRaw(subscriptionId, params);
     return SubscriptionMoveResponse.fromJson(response.getBodyAsString(), response);
   }
@@ -499,8 +503,8 @@ public SubscriptionMoveResponse move(String subscriptionId, SubscriptionMovePara
    * subscriptionsForCustomer a subscription using immutable params (executes immediately) - returns
    * raw Response.
    */
-  Response subscriptionsForCustomerRaw(
-      String customerId, SubscriptionSubscriptionsForCustomerParams params) throws Exception {
+  Response subscriptionsForCustomerRaw(String customerId, SubscriptionsForCustomerParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/subscriptions", "customer-id", customerId);
     return get(path, params != null ? params.toQueryParams() : null);
@@ -510,7 +514,7 @@ Response subscriptionsForCustomerRaw(
    * subscriptionsForCustomer a subscription without params (executes immediately) - returns raw
    * Response.
    */
-  Response subscriptionsForCustomerRaw(String customerId) throws Exception {
+  Response subscriptionsForCustomerRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/subscriptions", "customer-id", customerId);
     return get(path, null);
@@ -520,28 +524,29 @@ Response subscriptionsForCustomerRaw(String customerId) throws Exception {
    * subscriptionsForCustomer a subscription using raw JSON payload (executes immediately) - returns
    * raw Response.
    */
-  Response subscriptionsForCustomerRaw(String customerId, String jsonPayload) throws Exception {
+  Response subscriptionsForCustomerRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/subscriptions", "customer-id", customerId);
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public SubscriptionSubscriptionsForCustomerResponse subscriptionsForCustomer(
-      String customerId, SubscriptionSubscriptionsForCustomerParams params) throws Exception {
+  public SubscriptionsForCustomerResponse subscriptionsForCustomer(
+      String customerId, SubscriptionsForCustomerParams params) throws ChargebeeException {
     Response response = subscriptionsForCustomerRaw(customerId, params);
-    return SubscriptionSubscriptionsForCustomerResponse.fromJson(
+    return SubscriptionsForCustomerResponse.fromJson(
         response.getBodyAsString(), this, params, customerId, response);
   }
 
-  public SubscriptionSubscriptionsForCustomerResponse subscriptionsForCustomer(String customerId)
-      throws Exception {
+  public SubscriptionsForCustomerResponse subscriptionsForCustomer(String customerId)
+      throws ChargebeeException {
     Response response = subscriptionsForCustomerRaw(customerId);
-    return SubscriptionSubscriptionsForCustomerResponse.fromJson(
+    return SubscriptionsForCustomerResponse.fromJson(
         response.getBodyAsString(), this, null, customerId, response);
   }
 
   /** createForCustomer a subscription (executes immediately) - returns raw Response. */
-  Response createForCustomerRaw(String customerId) throws Exception {
+  Response createForCustomerRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/subscriptions", "customer-id", customerId);
 
@@ -553,7 +558,7 @@ Response createForCustomerRaw(String customerId) throws Exception {
    * Response.
    */
   Response createForCustomerRaw(String customerId, SubscriptionCreateForCustomerParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/subscriptions", "customer-id", customerId);
     return post(path, params.toFormData());
@@ -563,20 +568,20 @@ Response createForCustomerRaw(String customerId, SubscriptionCreateForCustomerPa
    * createForCustomer a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response createForCustomerRaw(String customerId, String jsonPayload) throws Exception {
+  Response createForCustomerRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/subscriptions", "customer-id", customerId);
     return postJson(path, jsonPayload);
   }
 
   public SubscriptionCreateForCustomerResponse createForCustomer(
-      String customerId, SubscriptionCreateForCustomerParams params) throws Exception {
+      String customerId, SubscriptionCreateForCustomerParams params) throws ChargebeeException {
     Response response = createForCustomerRaw(customerId, params);
     return SubscriptionCreateForCustomerResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** importForItems a subscription (executes immediately) - returns raw Response. */
-  Response importForItemsRaw(String customerId) throws Exception {
+  Response importForItemsRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/import_for_items", "customer-id", customerId);
 
@@ -588,7 +593,7 @@ Response importForItemsRaw(String customerId) throws Exception {
    * Response.
    */
   Response importForItemsRaw(String customerId, SubscriptionImportForItemsParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/import_for_items", "customer-id", customerId);
     return post(path, params.toFormData());
@@ -598,14 +603,14 @@ Response importForItemsRaw(String customerId, SubscriptionImportForItemsParams p
    * importForItems a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response importForItemsRaw(String customerId, String jsonPayload) throws Exception {
+  Response importForItemsRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/customers/{customer-id}/import_for_items", "customer-id", customerId);
     return postJson(path, jsonPayload);
   }
 
   public SubscriptionImportForItemsResponse importForItems(
-      String customerId, SubscriptionImportForItemsParams params) throws Exception {
+      String customerId, SubscriptionImportForItemsParams params) throws ChargebeeException {
     Response response = importForItemsRaw(customerId, params);
     return SubscriptionImportForItemsResponse.fromJson(response.getBodyAsString(), response);
   }
@@ -613,7 +618,7 @@ public SubscriptionImportForItemsResponse importForItems(
   /**
    * retrieveAdvanceInvoiceSchedule a subscription (executes immediately) - returns raw Response.
    */
-  Response retrieveAdvanceInvoiceScheduleRaw(String subscriptionId) throws Exception {
+  Response retrieveAdvanceInvoiceScheduleRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/retrieve_advance_invoice_schedule",
@@ -624,14 +629,14 @@ Response retrieveAdvanceInvoiceScheduleRaw(String subscriptionId) throws Excepti
   }
 
   public SubscriptionRetrieveAdvanceInvoiceScheduleResponse retrieveAdvanceInvoiceSchedule(
-      String subscriptionId) throws Exception {
+      String subscriptionId) throws ChargebeeException {
     Response response = retrieveAdvanceInvoiceScheduleRaw(subscriptionId);
     return SubscriptionRetrieveAdvanceInvoiceScheduleResponse.fromJson(
         response.getBodyAsString(), response);
   }
 
   /** removeScheduledCancellation a subscription (executes immediately) - returns raw Response. */
-  Response removeScheduledCancellationRaw(String subscriptionId) throws Exception {
+  Response removeScheduledCancellationRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/remove_scheduled_cancellation",
@@ -647,7 +652,7 @@ Response removeScheduledCancellationRaw(String subscriptionId) throws Exception
    */
   Response removeScheduledCancellationRaw(
       String subscriptionId, SubscriptionRemoveScheduledCancellationParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/remove_scheduled_cancellation",
@@ -661,7 +666,7 @@ Response removeScheduledCancellationRaw(
    * returns raw Response.
    */
   Response removeScheduledCancellationRaw(String subscriptionId, String jsonPayload)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/remove_scheduled_cancellation",
@@ -672,14 +677,14 @@ Response removeScheduledCancellationRaw(String subscriptionId, String jsonPayloa
 
   public SubscriptionRemoveScheduledCancellationResponse removeScheduledCancellation(
       String subscriptionId, SubscriptionRemoveScheduledCancellationParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = removeScheduledCancellationRaw(subscriptionId, params);
     return SubscriptionRemoveScheduledCancellationResponse.fromJson(
         response.getBodyAsString(), response);
   }
 
   /** retrieveWithScheduledChanges a subscription (executes immediately) - returns raw Response. */
-  Response retrieveWithScheduledChangesRaw(String subscriptionId) throws Exception {
+  Response retrieveWithScheduledChangesRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/retrieve_with_scheduled_changes",
@@ -690,14 +695,14 @@ Response retrieveWithScheduledChangesRaw(String subscriptionId) throws Exception
   }
 
   public SubscriptionRetrieveWithScheduledChangesResponse retrieveWithScheduledChanges(
-      String subscriptionId) throws Exception {
+      String subscriptionId) throws ChargebeeException {
     Response response = retrieveWithScheduledChangesRaw(subscriptionId);
     return SubscriptionRetrieveWithScheduledChangesResponse.fromJson(
         response.getBodyAsString(), response);
   }
 
   /** reactivate a subscription (executes immediately) - returns raw Response. */
-  Response reactivateRaw(String subscriptionId) throws Exception {
+  Response reactivateRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/reactivate", "subscription-id", subscriptionId);
@@ -709,7 +714,7 @@ Response reactivateRaw(String subscriptionId) throws Exception {
    * reactivate a subscription using immutable params (executes immediately) - returns raw Response.
    */
   Response reactivateRaw(String subscriptionId, SubscriptionReactivateParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/reactivate", "subscription-id", subscriptionId);
@@ -719,7 +724,7 @@ Response reactivateRaw(String subscriptionId, SubscriptionReactivateParams param
   /**
    * reactivate a subscription using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response reactivateRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response reactivateRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/reactivate", "subscription-id", subscriptionId);
@@ -727,13 +732,13 @@ Response reactivateRaw(String subscriptionId, String jsonPayload) throws Excepti
   }
 
   public SubscriptionReactivateResponse reactivate(
-      String subscriptionId, SubscriptionReactivateParams params) throws Exception {
+      String subscriptionId, SubscriptionReactivateParams params) throws ChargebeeException {
     Response response = reactivateRaw(subscriptionId, params);
     return SubscriptionReactivateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** chargeFutureRenewals a subscription (executes immediately) - returns raw Response. */
-  Response chargeFutureRenewalsRaw(String subscriptionId) throws Exception {
+  Response chargeFutureRenewalsRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/charge_future_renewals",
@@ -748,7 +753,8 @@ Response chargeFutureRenewalsRaw(String subscriptionId) throws Exception {
    * Response.
    */
   Response chargeFutureRenewalsRaw(
-      String subscriptionId, SubscriptionChargeFutureRenewalsParams params) throws Exception {
+      String subscriptionId, SubscriptionChargeFutureRenewalsParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/charge_future_renewals",
@@ -761,7 +767,8 @@ Response chargeFutureRenewalsRaw(
    * chargeFutureRenewals a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response chargeFutureRenewalsRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response chargeFutureRenewalsRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/charge_future_renewals",
@@ -771,13 +778,14 @@ Response chargeFutureRenewalsRaw(String subscriptionId, String jsonPayload) thro
   }
 
   public SubscriptionChargeFutureRenewalsResponse chargeFutureRenewals(
-      String subscriptionId, SubscriptionChargeFutureRenewalsParams params) throws Exception {
+      String subscriptionId, SubscriptionChargeFutureRenewalsParams params)
+      throws ChargebeeException {
     Response response = chargeFutureRenewalsRaw(subscriptionId, params);
     return SubscriptionChargeFutureRenewalsResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** addChargeAtTermEnd a subscription (executes immediately) - returns raw Response. */
-  Response addChargeAtTermEndRaw(String subscriptionId) throws Exception {
+  Response addChargeAtTermEndRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/add_charge_at_term_end",
@@ -792,7 +800,7 @@ Response addChargeAtTermEndRaw(String subscriptionId) throws Exception {
    * Response.
    */
   Response addChargeAtTermEndRaw(String subscriptionId, SubscriptionAddChargeAtTermEndParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/add_charge_at_term_end",
@@ -805,7 +813,8 @@ Response addChargeAtTermEndRaw(String subscriptionId, SubscriptionAddChargeAtTer
    * addChargeAtTermEnd a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response addChargeAtTermEndRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response addChargeAtTermEndRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/add_charge_at_term_end",
@@ -815,13 +824,14 @@ Response addChargeAtTermEndRaw(String subscriptionId, String jsonPayload) throws
   }
 
   public SubscriptionAddChargeAtTermEndResponse addChargeAtTermEnd(
-      String subscriptionId, SubscriptionAddChargeAtTermEndParams params) throws Exception {
+      String subscriptionId, SubscriptionAddChargeAtTermEndParams params)
+      throws ChargebeeException {
     Response response = addChargeAtTermEndRaw(subscriptionId, params);
     return SubscriptionAddChargeAtTermEndResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** removeScheduledChanges a subscription (executes immediately) - returns raw Response. */
-  Response removeScheduledChangesRaw(String subscriptionId) throws Exception {
+  Response removeScheduledChangesRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/remove_scheduled_changes",
@@ -832,14 +842,14 @@ Response removeScheduledChangesRaw(String subscriptionId) throws Exception {
   }
 
   public SubscriptionRemoveScheduledChangesResponse removeScheduledChanges(String subscriptionId)
-      throws Exception {
+      throws ChargebeeException {
     Response response = removeScheduledChangesRaw(subscriptionId);
     return SubscriptionRemoveScheduledChangesResponse.fromJson(
         response.getBodyAsString(), response);
   }
 
   /** changeTermEnd a subscription (executes immediately) - returns raw Response. */
-  Response changeTermEndRaw(String subscriptionId) throws Exception {
+  Response changeTermEndRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/change_term_end", "subscription-id", subscriptionId);
@@ -852,7 +862,7 @@ Response changeTermEndRaw(String subscriptionId) throws Exception {
    * Response.
    */
   Response changeTermEndRaw(String subscriptionId, SubscriptionChangeTermEndParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/change_term_end", "subscription-id", subscriptionId);
@@ -863,7 +873,7 @@ Response changeTermEndRaw(String subscriptionId, SubscriptionChangeTermEndParams
    * changeTermEnd a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response changeTermEndRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response changeTermEndRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/change_term_end", "subscription-id", subscriptionId);
@@ -871,13 +881,13 @@ Response changeTermEndRaw(String subscriptionId, String jsonPayload) throws Exce
   }
 
   public SubscriptionChangeTermEndResponse changeTermEnd(
-      String subscriptionId, SubscriptionChangeTermEndParams params) throws Exception {
+      String subscriptionId, SubscriptionChangeTermEndParams params) throws ChargebeeException {
     Response response = changeTermEndRaw(subscriptionId, params);
     return SubscriptionChangeTermEndResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** delete a subscription (executes immediately) - returns raw Response. */
-  Response deleteRaw(String subscriptionId) throws Exception {
+  Response deleteRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/delete", "subscription-id", subscriptionId);
@@ -885,13 +895,13 @@ Response deleteRaw(String subscriptionId) throws Exception {
     return post(path, null);
   }
 
-  public SubscriptionDeleteResponse delete(String subscriptionId) throws Exception {
+  public SubscriptionDeleteResponse delete(String subscriptionId) throws ChargebeeException {
     Response response = deleteRaw(subscriptionId);
     return SubscriptionDeleteResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** createWithItems a subscription (executes immediately) - returns raw Response. */
-  Response createWithItemsRaw(String customerId) throws Exception {
+  Response createWithItemsRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/subscription_for_items", "customer-id", customerId);
@@ -904,7 +914,7 @@ Response createWithItemsRaw(String customerId) throws Exception {
    * Response.
    */
   Response createWithItemsRaw(String customerId, SubscriptionCreateWithItemsParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/subscription_for_items", "customer-id", customerId);
@@ -915,7 +925,7 @@ Response createWithItemsRaw(String customerId, SubscriptionCreateWithItemsParams
    * createWithItems a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response createWithItemsRaw(String customerId, String jsonPayload) throws Exception {
+  Response createWithItemsRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/subscription_for_items", "customer-id", customerId);
@@ -923,13 +933,13 @@ Response createWithItemsRaw(String customerId, String jsonPayload) throws Except
   }
 
   public SubscriptionCreateWithItemsResponse createWithItems(
-      String customerId, SubscriptionCreateWithItemsParams params) throws Exception {
+      String customerId, SubscriptionCreateWithItemsParams params) throws ChargebeeException {
     Response response = createWithItemsRaw(customerId, params);
     return SubscriptionCreateWithItemsResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** importUnbilledCharges a subscription (executes immediately) - returns raw Response. */
-  Response importUnbilledChargesRaw(String subscriptionId) throws Exception {
+  Response importUnbilledChargesRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/import_unbilled_charges",
@@ -944,7 +954,8 @@ Response importUnbilledChargesRaw(String subscriptionId) throws Exception {
    * raw Response.
    */
   Response importUnbilledChargesRaw(
-      String subscriptionId, SubscriptionImportUnbilledChargesParams params) throws Exception {
+      String subscriptionId, SubscriptionImportUnbilledChargesParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/import_unbilled_charges",
@@ -957,7 +968,8 @@ Response importUnbilledChargesRaw(
    * importUnbilledCharges a subscription using raw JSON payload (executes immediately) - returns
    * raw Response.
    */
-  Response importUnbilledChargesRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response importUnbilledChargesRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/import_unbilled_charges",
@@ -967,13 +979,14 @@ Response importUnbilledChargesRaw(String subscriptionId, String jsonPayload) thr
   }
 
   public SubscriptionImportUnbilledChargesResponse importUnbilledCharges(
-      String subscriptionId, SubscriptionImportUnbilledChargesParams params) throws Exception {
+      String subscriptionId, SubscriptionImportUnbilledChargesParams params)
+      throws ChargebeeException {
     Response response = importUnbilledChargesRaw(subscriptionId, params);
     return SubscriptionImportUnbilledChargesResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** removeScheduledResumption a subscription (executes immediately) - returns raw Response. */
-  Response removeScheduledResumptionRaw(String subscriptionId) throws Exception {
+  Response removeScheduledResumptionRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/remove_scheduled_resumption",
@@ -984,27 +997,27 @@ Response removeScheduledResumptionRaw(String subscriptionId) throws Exception {
   }
 
   public SubscriptionRemoveScheduledResumptionResponse removeScheduledResumption(
-      String subscriptionId) throws Exception {
+      String subscriptionId) throws ChargebeeException {
     Response response = removeScheduledResumptionRaw(subscriptionId);
     return SubscriptionRemoveScheduledResumptionResponse.fromJson(
         response.getBodyAsString(), response);
   }
 
   /** retrieve a subscription (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String subscriptionId) throws Exception {
+  Response retrieveRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams("/subscriptions/{subscription-id}", "subscription-id", subscriptionId);
 
     return get(path, null);
   }
 
-  public SubscriptionRetrieveResponse retrieve(String subscriptionId) throws Exception {
+  public SubscriptionRetrieveResponse retrieve(String subscriptionId) throws ChargebeeException {
     Response response = retrieveRaw(subscriptionId);
     return SubscriptionRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a subscription (executes immediately) - returns raw Response. */
-  Response updateRaw(String subscriptionId) throws Exception {
+  Response updateRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams("/subscriptions/{subscription-id}", "subscription-id", subscriptionId);
 
@@ -1012,27 +1025,28 @@ Response updateRaw(String subscriptionId) throws Exception {
   }
 
   /** update a subscription using immutable params (executes immediately) - returns raw Response. */
-  Response updateRaw(String subscriptionId, SubscriptionUpdateParams params) throws Exception {
+  Response updateRaw(String subscriptionId, SubscriptionUpdateParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams("/subscriptions/{subscription-id}", "subscription-id", subscriptionId);
     return post(path, params.toFormData());
   }
 
   /** update a subscription using raw JSON payload (executes immediately) - returns raw Response. */
-  Response updateRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response updateRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams("/subscriptions/{subscription-id}", "subscription-id", subscriptionId);
     return postJson(path, jsonPayload);
   }
 
   public SubscriptionUpdateResponse update(String subscriptionId, SubscriptionUpdateParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = updateRaw(subscriptionId, params);
     return SubscriptionUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** importContractTerm a subscription (executes immediately) - returns raw Response. */
-  Response importContractTermRaw(String subscriptionId) throws Exception {
+  Response importContractTermRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/import_contract_term",
@@ -1047,7 +1061,7 @@ Response importContractTermRaw(String subscriptionId) throws Exception {
    * Response.
    */
   Response importContractTermRaw(String subscriptionId, SubscriptionImportContractTermParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/import_contract_term",
@@ -1060,7 +1074,8 @@ Response importContractTermRaw(String subscriptionId, SubscriptionImportContract
    * importContractTerm a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response importContractTermRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response importContractTermRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/import_contract_term",
@@ -1070,13 +1085,14 @@ Response importContractTermRaw(String subscriptionId, String jsonPayload) throws
   }
 
   public SubscriptionImportContractTermResponse importContractTerm(
-      String subscriptionId, SubscriptionImportContractTermParams params) throws Exception {
+      String subscriptionId, SubscriptionImportContractTermParams params)
+      throws ChargebeeException {
     Response response = importContractTermRaw(subscriptionId, params);
     return SubscriptionImportContractTermResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** overrideBillingProfile a subscription (executes immediately) - returns raw Response. */
-  Response overrideBillingProfileRaw(String subscriptionId) throws Exception {
+  Response overrideBillingProfileRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/override_billing_profile",
@@ -1091,7 +1107,8 @@ Response overrideBillingProfileRaw(String subscriptionId) throws Exception {
    * raw Response.
    */
   Response overrideBillingProfileRaw(
-      String subscriptionId, SubscriptionOverrideBillingProfileParams params) throws Exception {
+      String subscriptionId, SubscriptionOverrideBillingProfileParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/override_billing_profile",
@@ -1104,7 +1121,8 @@ Response overrideBillingProfileRaw(
    * overrideBillingProfile a subscription using raw JSON payload (executes immediately) - returns
    * raw Response.
    */
-  Response overrideBillingProfileRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response overrideBillingProfileRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/override_billing_profile",
@@ -1114,14 +1132,15 @@ Response overrideBillingProfileRaw(String subscriptionId, String jsonPayload) th
   }
 
   public SubscriptionOverrideBillingProfileResponse overrideBillingProfile(
-      String subscriptionId, SubscriptionOverrideBillingProfileParams params) throws Exception {
+      String subscriptionId, SubscriptionOverrideBillingProfileParams params)
+      throws ChargebeeException {
     Response response = overrideBillingProfileRaw(subscriptionId, params);
     return SubscriptionOverrideBillingProfileResponse.fromJson(
         response.getBodyAsString(), response);
   }
 
   /** removeScheduledPause a subscription (executes immediately) - returns raw Response. */
-  Response removeScheduledPauseRaw(String subscriptionId) throws Exception {
+  Response removeScheduledPauseRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/remove_scheduled_pause",
@@ -1132,13 +1151,13 @@ Response removeScheduledPauseRaw(String subscriptionId) throws Exception {
   }
 
   public SubscriptionRemoveScheduledPauseResponse removeScheduledPause(String subscriptionId)
-      throws Exception {
+      throws ChargebeeException {
     Response response = removeScheduledPauseRaw(subscriptionId);
     return SubscriptionRemoveScheduledPauseResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** editAdvanceInvoiceSchedule a subscription (executes immediately) - returns raw Response. */
-  Response editAdvanceInvoiceScheduleRaw(String subscriptionId) throws Exception {
+  Response editAdvanceInvoiceScheduleRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/edit_advance_invoice_schedule",
@@ -1153,7 +1172,8 @@ Response editAdvanceInvoiceScheduleRaw(String subscriptionId) throws Exception {
    * returns raw Response.
    */
   Response editAdvanceInvoiceScheduleRaw(
-      String subscriptionId, SubscriptionEditAdvanceInvoiceScheduleParams params) throws Exception {
+      String subscriptionId, SubscriptionEditAdvanceInvoiceScheduleParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/edit_advance_invoice_schedule",
@@ -1167,7 +1187,7 @@ Response editAdvanceInvoiceScheduleRaw(
    * returns raw Response.
    */
   Response editAdvanceInvoiceScheduleRaw(String subscriptionId, String jsonPayload)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/edit_advance_invoice_schedule",
@@ -1177,7 +1197,8 @@ Response editAdvanceInvoiceScheduleRaw(String subscriptionId, String jsonPayload
   }
 
   public SubscriptionEditAdvanceInvoiceScheduleResponse editAdvanceInvoiceSchedule(
-      String subscriptionId, SubscriptionEditAdvanceInvoiceScheduleParams params) throws Exception {
+      String subscriptionId, SubscriptionEditAdvanceInvoiceScheduleParams params)
+      throws ChargebeeException {
     Response response = editAdvanceInvoiceScheduleRaw(subscriptionId, params);
     return SubscriptionEditAdvanceInvoiceScheduleResponse.fromJson(
         response.getBodyAsString(), response);
@@ -1188,7 +1209,7 @@ public SubscriptionEditAdvanceInvoiceScheduleResponse editAdvanceInvoiceSchedule
    * Response.
    */
   Response listDiscountsRaw(String subscriptionId, SubscriptionListDiscountsParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/discounts", "subscription-id", subscriptionId);
@@ -1196,7 +1217,7 @@ Response listDiscountsRaw(String subscriptionId, SubscriptionListDiscountsParams
   }
 
   /** listDiscounts a subscription without params (executes immediately) - returns raw Response. */
-  Response listDiscountsRaw(String subscriptionId) throws Exception {
+  Response listDiscountsRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/discounts", "subscription-id", subscriptionId);
@@ -1207,7 +1228,7 @@ Response listDiscountsRaw(String subscriptionId) throws Exception {
    * listDiscounts a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response listDiscountsRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response listDiscountsRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/discounts", "subscription-id", subscriptionId);
@@ -1215,13 +1236,14 @@ Response listDiscountsRaw(String subscriptionId, String jsonPayload) throws Exce
   }
 
   public SubscriptionListDiscountsResponse listDiscounts(
-      String subscriptionId, SubscriptionListDiscountsParams params) throws Exception {
+      String subscriptionId, SubscriptionListDiscountsParams params) throws ChargebeeException {
     Response response = listDiscountsRaw(subscriptionId, params);
     return SubscriptionListDiscountsResponse.fromJson(
         response.getBodyAsString(), this, params, subscriptionId, response);
   }
 
-  public SubscriptionListDiscountsResponse listDiscounts(String subscriptionId) throws Exception {
+  public SubscriptionListDiscountsResponse listDiscounts(String subscriptionId)
+      throws ChargebeeException {
     Response response = listDiscountsRaw(subscriptionId);
     return SubscriptionListDiscountsResponse.fromJson(
         response.getBodyAsString(), this, null, subscriptionId, response);
@@ -1232,8 +1254,7 @@ public SubscriptionListDiscountsResponse listDiscounts(String subscriptionId) th
    * returns raw Response.
    */
   Response contractTermsForSubscriptionRaw(
-      String subscriptionId, SubscriptionContractTermsForSubscriptionParams params)
-      throws Exception {
+      String subscriptionId, ContractTermsForSubscriptionParams params) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/contract_terms", "subscription-id", subscriptionId);
@@ -1244,7 +1265,7 @@ Response contractTermsForSubscriptionRaw(
    * contractTermsForSubscription a subscription without params (executes immediately) - returns raw
    * Response.
    */
-  Response contractTermsForSubscriptionRaw(String subscriptionId) throws Exception {
+  Response contractTermsForSubscriptionRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/contract_terms", "subscription-id", subscriptionId);
@@ -1256,30 +1277,29 @@ Response contractTermsForSubscriptionRaw(String subscriptionId) throws Exception
    * returns raw Response.
    */
   Response contractTermsForSubscriptionRaw(String subscriptionId, String jsonPayload)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/contract_terms", "subscription-id", subscriptionId);
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public SubscriptionContractTermsForSubscriptionResponse contractTermsForSubscription(
-      String subscriptionId, SubscriptionContractTermsForSubscriptionParams params)
-      throws Exception {
+  public ContractTermsForSubscriptionResponse contractTermsForSubscription(
+      String subscriptionId, ContractTermsForSubscriptionParams params) throws ChargebeeException {
     Response response = contractTermsForSubscriptionRaw(subscriptionId, params);
-    return SubscriptionContractTermsForSubscriptionResponse.fromJson(
+    return ContractTermsForSubscriptionResponse.fromJson(
         response.getBodyAsString(), this, params, subscriptionId, response);
   }
 
-  public SubscriptionContractTermsForSubscriptionResponse contractTermsForSubscription(
-      String subscriptionId) throws Exception {
+  public ContractTermsForSubscriptionResponse contractTermsForSubscription(String subscriptionId)
+      throws ChargebeeException {
     Response response = contractTermsForSubscriptionRaw(subscriptionId);
-    return SubscriptionContractTermsForSubscriptionResponse.fromJson(
+    return ContractTermsForSubscriptionResponse.fromJson(
         response.getBodyAsString(), this, null, subscriptionId, response);
   }
 
   /** pause a subscription (executes immediately) - returns raw Response. */
-  Response pauseRaw(String subscriptionId) throws Exception {
+  Response pauseRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/pause", "subscription-id", subscriptionId);
@@ -1288,7 +1308,8 @@ Response pauseRaw(String subscriptionId) throws Exception {
   }
 
   /** pause a subscription using immutable params (executes immediately) - returns raw Response. */
-  Response pauseRaw(String subscriptionId, SubscriptionPauseParams params) throws Exception {
+  Response pauseRaw(String subscriptionId, SubscriptionPauseParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/pause", "subscription-id", subscriptionId);
@@ -1296,7 +1317,7 @@ Response pauseRaw(String subscriptionId, SubscriptionPauseParams params) throws
   }
 
   /** pause a subscription using raw JSON payload (executes immediately) - returns raw Response. */
-  Response pauseRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response pauseRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/pause", "subscription-id", subscriptionId);
@@ -1304,13 +1325,13 @@ Response pauseRaw(String subscriptionId, String jsonPayload) throws Exception {
   }
 
   public SubscriptionPauseResponse pause(String subscriptionId, SubscriptionPauseParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = pauseRaw(subscriptionId, params);
     return SubscriptionPauseResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** importForCustomer a subscription (executes immediately) - returns raw Response. */
-  Response importForCustomerRaw(String customerId) throws Exception {
+  Response importForCustomerRaw(String customerId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/import_subscription", "customer-id", customerId);
@@ -1323,7 +1344,7 @@ Response importForCustomerRaw(String customerId) throws Exception {
    * Response.
    */
   Response importForCustomerRaw(String customerId, SubscriptionImportForCustomerParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/import_subscription", "customer-id", customerId);
@@ -1334,7 +1355,7 @@ Response importForCustomerRaw(String customerId, SubscriptionImportForCustomerPa
    * importForCustomer a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response importForCustomerRaw(String customerId, String jsonPayload) throws Exception {
+  Response importForCustomerRaw(String customerId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/customers/{customer-id}/import_subscription", "customer-id", customerId);
@@ -1342,7 +1363,7 @@ Response importForCustomerRaw(String customerId, String jsonPayload) throws Exce
   }
 
   public SubscriptionImportForCustomerResponse importForCustomer(
-      String customerId, SubscriptionImportForCustomerParams params) throws Exception {
+      String customerId, SubscriptionImportForCustomerParams params) throws ChargebeeException {
     Response response = importForCustomerRaw(customerId, params);
     return SubscriptionImportForCustomerResponse.fromJson(response.getBodyAsString(), response);
   }
@@ -1351,7 +1372,7 @@ public SubscriptionImportForCustomerResponse importForCustomer(
    * importSubscription a subscription using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response importSubscriptionRaw(SubscriptionImportSubscriptionParams params) throws Exception {
+  Response importSubscriptionRaw(ImportSubscriptionParams params) throws ChargebeeException {
 
     return post("/subscriptions/import_subscription", params != null ? params.toFormData() : null);
   }
@@ -1360,20 +1381,20 @@ Response importSubscriptionRaw(SubscriptionImportSubscriptionParams params) thro
    * importSubscription a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response importSubscriptionRaw(String jsonPayload) throws Exception {
+  Response importSubscriptionRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/subscriptions/import_subscription", jsonPayload);
   }
 
-  public SubscriptionImportSubscriptionResponse importSubscription(
-      SubscriptionImportSubscriptionParams params) throws Exception {
+  public ImportSubscriptionResponse importSubscription(ImportSubscriptionParams params)
+      throws ChargebeeException {
     Response response = importSubscriptionRaw(params);
 
-    return SubscriptionImportSubscriptionResponse.fromJson(response.getBodyAsString(), response);
+    return ImportSubscriptionResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** cancel a subscription (executes immediately) - returns raw Response. */
-  Response cancelRaw(String subscriptionId) throws Exception {
+  Response cancelRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/cancel", "subscription-id", subscriptionId);
@@ -1382,7 +1403,8 @@ Response cancelRaw(String subscriptionId) throws Exception {
   }
 
   /** cancel a subscription using immutable params (executes immediately) - returns raw Response. */
-  Response cancelRaw(String subscriptionId, SubscriptionCancelParams params) throws Exception {
+  Response cancelRaw(String subscriptionId, SubscriptionCancelParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/cancel", "subscription-id", subscriptionId);
@@ -1390,7 +1412,7 @@ Response cancelRaw(String subscriptionId, SubscriptionCancelParams params) throw
   }
 
   /** cancel a subscription using raw JSON payload (executes immediately) - returns raw Response. */
-  Response cancelRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response cancelRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/cancel", "subscription-id", subscriptionId);
@@ -1398,13 +1420,13 @@ Response cancelRaw(String subscriptionId, String jsonPayload) throws Exception {
   }
 
   public SubscriptionCancelResponse cancel(String subscriptionId, SubscriptionCancelParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = cancelRaw(subscriptionId, params);
     return SubscriptionCancelResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** chargeAddonAtTermEnd a subscription (executes immediately) - returns raw Response. */
-  Response chargeAddonAtTermEndRaw(String subscriptionId) throws Exception {
+  Response chargeAddonAtTermEndRaw(String subscriptionId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/charge_addon_at_term_end",
@@ -1419,7 +1441,8 @@ Response chargeAddonAtTermEndRaw(String subscriptionId) throws Exception {
    * Response.
    */
   Response chargeAddonAtTermEndRaw(
-      String subscriptionId, SubscriptionChargeAddonAtTermEndParams params) throws Exception {
+      String subscriptionId, SubscriptionChargeAddonAtTermEndParams params)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/charge_addon_at_term_end",
@@ -1432,7 +1455,8 @@ Response chargeAddonAtTermEndRaw(
    * chargeAddonAtTermEnd a subscription using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response chargeAddonAtTermEndRaw(String subscriptionId, String jsonPayload) throws Exception {
+  Response chargeAddonAtTermEndRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/subscriptions/{subscription-id}/charge_addon_at_term_end",
@@ -1442,7 +1466,8 @@ Response chargeAddonAtTermEndRaw(String subscriptionId, String jsonPayload) thro
   }
 
   public SubscriptionChargeAddonAtTermEndResponse chargeAddonAtTermEnd(
-      String subscriptionId, SubscriptionChargeAddonAtTermEndParams params) throws Exception {
+      String subscriptionId, SubscriptionChargeAddonAtTermEndParams params)
+      throws ChargebeeException {
     Response response = chargeAddonAtTermEndRaw(subscriptionId, params);
     return SubscriptionChargeAddonAtTermEndResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/core/services/SubscriptionSettingService.java b/src/main/java/com/chargebee/v4/services/SubscriptionSettingService.java
similarity index 83%
rename from src/main/java/com/chargebee/v4/core/services/SubscriptionSettingService.java
rename to src/main/java/com/chargebee/v4/services/SubscriptionSettingService.java
index 8d4dd6ad..1a002285 100644
--- a/src/main/java/com/chargebee/v4/core/services/SubscriptionSettingService.java
+++ b/src/main/java/com/chargebee/v4/services/SubscriptionSettingService.java
@@ -5,15 +5,16 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.subscriptionSetting.params.SubscriptionSettingRetrieveParams;
+import com.chargebee.v4.models.subscriptionSetting.params.SubscriptionSettingRetrieveParams;
 
-import com.chargebee.v4.core.responses.subscriptionSetting.SubscriptionSettingRetrieveResponse;
+import com.chargebee.v4.models.subscriptionSetting.responses.SubscriptionSettingRetrieveResponse;
 
 public final class SubscriptionSettingService extends BaseService<SubscriptionSettingService> {
 
@@ -54,7 +55,7 @@ public SubscriptionSettingService withOptions(RequestOptions options) {
    * retrieve a subscriptionSetting using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveRaw(SubscriptionSettingRetrieveParams params) throws Exception {
+  Response retrieveRaw(SubscriptionSettingRetrieveParams params) throws ChargebeeException {
 
     return get("/subscription_settings/retrieve", params != null ? params.toQueryParams() : null);
   }
@@ -63,13 +64,13 @@ Response retrieveRaw(SubscriptionSettingRetrieveParams params) throws Exception
    * retrieve a subscriptionSetting using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveRaw(String jsonPayload) throws Exception {
+  Response retrieveRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public SubscriptionSettingRetrieveResponse retrieve(SubscriptionSettingRetrieveParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = retrieveRaw(params);
 
     return SubscriptionSettingRetrieveResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/core/services/ThirdPartyConfigurationService.java b/src/main/java/com/chargebee/v4/services/ThirdPartyConfigurationService.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/services/ThirdPartyConfigurationService.java
rename to src/main/java/com/chargebee/v4/services/ThirdPartyConfigurationService.java
index 79a4e487..46882176 100644
--- a/src/main/java/com/chargebee/v4/core/services/ThirdPartyConfigurationService.java
+++ b/src/main/java/com/chargebee/v4/services/ThirdPartyConfigurationService.java
@@ -5,23 +5,24 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.thirdPartyConfiguration.params.ThirdPartyConfigurationConfigurationsParams;
+import com.chargebee.v4.models.thirdPartyConfiguration.params.ThirdPartyConfigurationConfigurationsParams;
 
-import com.chargebee.v4.core.models.thirdPartyConfiguration.params.ThirdPartyConfigurationRetrieveParams;
+import com.chargebee.v4.models.thirdPartyConfiguration.params.ThirdPartyConfigurationRetrieveParams;
 
-import com.chargebee.v4.core.models.thirdPartyConfiguration.params.ThirdPartyConfigurationUpdateParams;
+import com.chargebee.v4.models.thirdPartyConfiguration.params.ThirdPartyConfigurationUpdateParams;
 
-import com.chargebee.v4.core.responses.thirdPartyConfiguration.ThirdPartyConfigurationConfigurationsResponse;
+import com.chargebee.v4.models.thirdPartyConfiguration.responses.ThirdPartyConfigurationConfigurationsResponse;
 
-import com.chargebee.v4.core.responses.thirdPartyConfiguration.ThirdPartyConfigurationRetrieveResponse;
+import com.chargebee.v4.models.thirdPartyConfiguration.responses.ThirdPartyConfigurationRetrieveResponse;
 
-import com.chargebee.v4.core.responses.thirdPartyConfiguration.ThirdPartyConfigurationUpdateResponse;
+import com.chargebee.v4.models.thirdPartyConfiguration.responses.ThirdPartyConfigurationUpdateResponse;
 
 public final class ThirdPartyConfigurationService
     extends BaseService<ThirdPartyConfigurationService> {
@@ -63,7 +64,8 @@ public ThirdPartyConfigurationService withOptions(RequestOptions options) {
    * configurations a thirdPartyConfiguration using immutable params (executes immediately) -
    * returns raw Response.
    */
-  Response configurationsRaw(ThirdPartyConfigurationConfigurationsParams params) throws Exception {
+  Response configurationsRaw(ThirdPartyConfigurationConfigurationsParams params)
+      throws ChargebeeException {
 
     return get(
         "/third_party_configurations/configurations",
@@ -74,13 +76,13 @@ Response configurationsRaw(ThirdPartyConfigurationConfigurationsParams params) t
    * configurations a thirdPartyConfiguration using raw JSON payload (executes immediately) -
    * returns raw Response.
    */
-  Response configurationsRaw(String jsonPayload) throws Exception {
+  Response configurationsRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public ThirdPartyConfigurationConfigurationsResponse configurations(
-      ThirdPartyConfigurationConfigurationsParams params) throws Exception {
+      ThirdPartyConfigurationConfigurationsParams params) throws ChargebeeException {
     Response response = configurationsRaw(params);
 
     return ThirdPartyConfigurationConfigurationsResponse.fromJson(
@@ -91,7 +93,7 @@ public ThirdPartyConfigurationConfigurationsResponse configurations(
    * retrieve a thirdPartyConfiguration using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveRaw(ThirdPartyConfigurationRetrieveParams params) throws Exception {
+  Response retrieveRaw(ThirdPartyConfigurationRetrieveParams params) throws ChargebeeException {
 
     return get("/third_party_configurations", params != null ? params.toQueryParams() : null);
   }
@@ -100,13 +102,13 @@ Response retrieveRaw(ThirdPartyConfigurationRetrieveParams params) throws Except
    * retrieve a thirdPartyConfiguration using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveRaw(String jsonPayload) throws Exception {
+  Response retrieveRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public ThirdPartyConfigurationRetrieveResponse retrieve(
-      ThirdPartyConfigurationRetrieveParams params) throws Exception {
+      ThirdPartyConfigurationRetrieveParams params) throws ChargebeeException {
     Response response = retrieveRaw(params);
 
     return ThirdPartyConfigurationRetrieveResponse.fromJson(response.getBodyAsString(), response);
@@ -116,7 +118,7 @@ public ThirdPartyConfigurationRetrieveResponse retrieve(
    * update a thirdPartyConfiguration using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response updateRaw(ThirdPartyConfigurationUpdateParams params) throws Exception {
+  Response updateRaw(ThirdPartyConfigurationUpdateParams params) throws ChargebeeException {
 
     return post("/third_party_configurations", params != null ? params.toFormData() : null);
   }
@@ -125,13 +127,13 @@ Response updateRaw(ThirdPartyConfigurationUpdateParams params) throws Exception
    * update a thirdPartyConfiguration using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response updateRaw(String jsonPayload) throws Exception {
+  Response updateRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/third_party_configurations", jsonPayload);
   }
 
   public ThirdPartyConfigurationUpdateResponse update(ThirdPartyConfigurationUpdateParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = updateRaw(params);
 
     return ThirdPartyConfigurationUpdateResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/services/ThirdPartyEntityMappingService.java b/src/main/java/com/chargebee/v4/services/ThirdPartyEntityMappingService.java
new file mode 100644
index 00000000..00824544
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/ThirdPartyEntityMappingService.java
@@ -0,0 +1,188 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.thirdPartyEntityMapping.params.ThirdPartyEntityMappingRetrieveEntityParams;
+
+import com.chargebee.v4.models.thirdPartyEntityMapping.params.ThirdPartyEntityMappingListAllParams;
+
+import com.chargebee.v4.models.thirdPartyEntityMapping.params.ThirdPartyEntityMappingUpdateEntityParams;
+
+import com.chargebee.v4.models.thirdPartyEntityMapping.params.ThirdPartyEntityMappingListParams;
+
+import com.chargebee.v4.models.thirdPartyEntityMapping.responses.ThirdPartyEntityMappingRetrieveEntityResponse;
+
+import com.chargebee.v4.models.thirdPartyEntityMapping.responses.ThirdPartyEntityMappingListAllResponse;
+
+import com.chargebee.v4.models.thirdPartyEntityMapping.responses.ThirdPartyEntityMappingUpdateEntityResponse;
+
+import com.chargebee.v4.models.thirdPartyEntityMapping.responses.ThirdPartyEntityMappingListResponse;
+
+public final class ThirdPartyEntityMappingService
+    extends BaseService<ThirdPartyEntityMappingService> {
+
+  private final ServiceConfig config;
+
+  public ThirdPartyEntityMappingService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private ThirdPartyEntityMappingService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private ThirdPartyEntityMappingService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  ThirdPartyEntityMappingService with(RequestOptions newOptions) {
+    return new ThirdPartyEntityMappingService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public ThirdPartyEntityMappingService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * retrieveEntity a thirdPartyEntityMapping using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response retrieveEntityRaw(ThirdPartyEntityMappingRetrieveEntityParams params)
+      throws ChargebeeException {
+
+    return get(
+        "/third_party_entity_mappings/retrieve", params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * retrieveEntity a thirdPartyEntityMapping using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response retrieveEntityRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public ThirdPartyEntityMappingRetrieveEntityResponse retrieveEntity(
+      ThirdPartyEntityMappingRetrieveEntityParams params) throws ChargebeeException {
+    Response response = retrieveEntityRaw(params);
+
+    return ThirdPartyEntityMappingRetrieveEntityResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /**
+   * listAll a thirdPartyEntityMapping using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response listAllRaw(ThirdPartyEntityMappingListAllParams params) throws ChargebeeException {
+
+    return get(
+        "/third_party_entity_mappings/list_all", params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * listAll a thirdPartyEntityMapping using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response listAllRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public ThirdPartyEntityMappingListAllResponse listAll(ThirdPartyEntityMappingListAllParams params)
+      throws ChargebeeException {
+    Response response = listAllRaw(params);
+
+    return ThirdPartyEntityMappingListAllResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * updateEntity a thirdPartyEntityMapping using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response updateEntityRaw(ThirdPartyEntityMappingUpdateEntityParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/third_party_entity_mappings/update_entity", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * updateEntity a thirdPartyEntityMapping using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response updateEntityRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/third_party_entity_mappings/update_entity", jsonPayload);
+  }
+
+  public ThirdPartyEntityMappingUpdateEntityResponse updateEntity(
+      ThirdPartyEntityMappingUpdateEntityParams params) throws ChargebeeException {
+    Response response = updateEntityRaw(params);
+
+    return ThirdPartyEntityMappingUpdateEntityResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+
+  /**
+   * list a thirdPartyEntityMapping using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response listRaw(ThirdPartyEntityMappingListParams params) throws ChargebeeException {
+
+    return get("/third_party_entity_mappings", params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * list a thirdPartyEntityMapping without params (executes immediately) - returns raw Response.
+   */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/third_party_entity_mappings", null);
+  }
+
+  /**
+   * list a thirdPartyEntityMapping using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public ThirdPartyEntityMappingListResponse list(ThirdPartyEntityMappingListParams params)
+      throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return ThirdPartyEntityMappingListResponse.fromJson(
+        response.getBodyAsString(), this, params, response);
+  }
+
+  public ThirdPartyEntityMappingListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return ThirdPartyEntityMappingListResponse.fromJson(
+        response.getBodyAsString(), this, null, response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/ThirdPartySyncDetailService.java b/src/main/java/com/chargebee/v4/services/ThirdPartySyncDetailService.java
similarity index 78%
rename from src/main/java/com/chargebee/v4/core/services/ThirdPartySyncDetailService.java
rename to src/main/java/com/chargebee/v4/services/ThirdPartySyncDetailService.java
index 557e8a7a..ace525cb 100644
--- a/src/main/java/com/chargebee/v4/core/services/ThirdPartySyncDetailService.java
+++ b/src/main/java/com/chargebee/v4/services/ThirdPartySyncDetailService.java
@@ -5,25 +5,26 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.thirdPartySyncDetail.params.ThirdPartySyncDetailUpdateParams;
+import com.chargebee.v4.models.thirdPartySyncDetail.params.ThirdPartySyncDetailUpdateParams;
 
-import com.chargebee.v4.core.models.thirdPartySyncDetail.params.ThirdPartySyncDetailCreateParams;
+import com.chargebee.v4.models.thirdPartySyncDetail.params.ThirdPartySyncDetailCreateParams;
 
-import com.chargebee.v4.core.models.thirdPartySyncDetail.params.ThirdPartySyncDetailRetrieveLatestSyncParams;
+import com.chargebee.v4.models.thirdPartySyncDetail.params.ThirdPartySyncDetailRetrieveLatestSyncParams;
 
-import com.chargebee.v4.core.responses.thirdPartySyncDetail.ThirdPartySyncDetailRetrieveResponse;
+import com.chargebee.v4.models.thirdPartySyncDetail.responses.ThirdPartySyncDetailRetrieveResponse;
 
-import com.chargebee.v4.core.responses.thirdPartySyncDetail.ThirdPartySyncDetailUpdateResponse;
+import com.chargebee.v4.models.thirdPartySyncDetail.responses.ThirdPartySyncDetailUpdateResponse;
 
-import com.chargebee.v4.core.responses.thirdPartySyncDetail.ThirdPartySyncDetailCreateResponse;
+import com.chargebee.v4.models.thirdPartySyncDetail.responses.ThirdPartySyncDetailCreateResponse;
 
-import com.chargebee.v4.core.responses.thirdPartySyncDetail.ThirdPartySyncDetailRetrieveLatestSyncResponse;
+import com.chargebee.v4.models.thirdPartySyncDetail.responses.ThirdPartySyncDetailRetrieveLatestSyncResponse;
 
 public final class ThirdPartySyncDetailService extends BaseService<ThirdPartySyncDetailService> {
 
@@ -61,7 +62,7 @@ public ThirdPartySyncDetailService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** retrieve a thirdPartySyncDetail (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String tpIntegSyncDetailId) throws Exception {
+  Response retrieveRaw(String tpIntegSyncDetailId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/third_party_sync_details/{tp-integ-sync-detail-id}",
@@ -72,13 +73,13 @@ Response retrieveRaw(String tpIntegSyncDetailId) throws Exception {
   }
 
   public ThirdPartySyncDetailRetrieveResponse retrieve(String tpIntegSyncDetailId)
-      throws Exception {
+      throws ChargebeeException {
     Response response = retrieveRaw(tpIntegSyncDetailId);
     return ThirdPartySyncDetailRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a thirdPartySyncDetail (executes immediately) - returns raw Response. */
-  Response updateRaw(String tpIntegSyncDetailId) throws Exception {
+  Response updateRaw(String tpIntegSyncDetailId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/third_party_sync_details/{tp-integ-sync-detail-id}",
@@ -93,7 +94,7 @@ Response updateRaw(String tpIntegSyncDetailId) throws Exception {
    * Response.
    */
   Response updateRaw(String tpIntegSyncDetailId, ThirdPartySyncDetailUpdateParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/third_party_sync_details/{tp-integ-sync-detail-id}",
@@ -106,7 +107,7 @@ Response updateRaw(String tpIntegSyncDetailId, ThirdPartySyncDetailUpdateParams
    * update a thirdPartySyncDetail using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response updateRaw(String tpIntegSyncDetailId, String jsonPayload) throws Exception {
+  Response updateRaw(String tpIntegSyncDetailId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/third_party_sync_details/{tp-integ-sync-detail-id}",
@@ -116,7 +117,8 @@ Response updateRaw(String tpIntegSyncDetailId, String jsonPayload) throws Except
   }
 
   public ThirdPartySyncDetailUpdateResponse update(
-      String tpIntegSyncDetailId, ThirdPartySyncDetailUpdateParams params) throws Exception {
+      String tpIntegSyncDetailId, ThirdPartySyncDetailUpdateParams params)
+      throws ChargebeeException {
     Response response = updateRaw(tpIntegSyncDetailId, params);
     return ThirdPartySyncDetailUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
@@ -125,7 +127,7 @@ public ThirdPartySyncDetailUpdateResponse update(
    * create a thirdPartySyncDetail using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response createRaw(ThirdPartySyncDetailCreateParams params) throws Exception {
+  Response createRaw(ThirdPartySyncDetailCreateParams params) throws ChargebeeException {
 
     return post("/third_party_sync_details", params != null ? params.toFormData() : null);
   }
@@ -134,13 +136,13 @@ Response createRaw(ThirdPartySyncDetailCreateParams params) throws Exception {
    * create a thirdPartySyncDetail using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/third_party_sync_details", jsonPayload);
   }
 
   public ThirdPartySyncDetailCreateResponse create(ThirdPartySyncDetailCreateParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = createRaw(params);
 
     return ThirdPartySyncDetailCreateResponse.fromJson(response.getBodyAsString(), response);
@@ -151,7 +153,7 @@ public ThirdPartySyncDetailCreateResponse create(ThirdPartySyncDetailCreateParam
    * returns raw Response.
    */
   Response retrieveLatestSyncRaw(ThirdPartySyncDetailRetrieveLatestSyncParams params)
-      throws Exception {
+      throws ChargebeeException {
 
     return get(
         "/third_party_sync_details/retrieve_latest_sync",
@@ -162,13 +164,13 @@ Response retrieveLatestSyncRaw(ThirdPartySyncDetailRetrieveLatestSyncParams para
    * retrieveLatestSync a thirdPartySyncDetail using raw JSON payload (executes immediately) -
    * returns raw Response.
    */
-  Response retrieveLatestSyncRaw(String jsonPayload) throws Exception {
+  Response retrieveLatestSyncRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public ThirdPartySyncDetailRetrieveLatestSyncResponse retrieveLatestSync(
-      ThirdPartySyncDetailRetrieveLatestSyncParams params) throws Exception {
+      ThirdPartySyncDetailRetrieveLatestSyncParams params) throws ChargebeeException {
     Response response = retrieveLatestSyncRaw(params);
 
     return ThirdPartySyncDetailRetrieveLatestSyncResponse.fromJson(
diff --git a/src/main/java/com/chargebee/v4/core/services/TimeMachineService.java b/src/main/java/com/chargebee/v4/services/TimeMachineService.java
similarity index 82%
rename from src/main/java/com/chargebee/v4/core/services/TimeMachineService.java
rename to src/main/java/com/chargebee/v4/services/TimeMachineService.java
index 4a8c8bfa..1deabbe4 100644
--- a/src/main/java/com/chargebee/v4/core/services/TimeMachineService.java
+++ b/src/main/java/com/chargebee/v4/services/TimeMachineService.java
@@ -5,21 +5,22 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.timeMachine.params.TimeMachineTravelForwardParams;
+import com.chargebee.v4.models.timeMachine.params.TimeMachineTravelForwardParams;
 
-import com.chargebee.v4.core.models.timeMachine.params.TimeMachineStartAfreshParams;
+import com.chargebee.v4.models.timeMachine.params.TimeMachineStartAfreshParams;
 
-import com.chargebee.v4.core.responses.timeMachine.TimeMachineRetrieveResponse;
+import com.chargebee.v4.models.timeMachine.responses.TimeMachineRetrieveResponse;
 
-import com.chargebee.v4.core.responses.timeMachine.TimeMachineTravelForwardResponse;
+import com.chargebee.v4.models.timeMachine.responses.TimeMachineTravelForwardResponse;
 
-import com.chargebee.v4.core.responses.timeMachine.TimeMachineStartAfreshResponse;
+import com.chargebee.v4.models.timeMachine.responses.TimeMachineStartAfreshResponse;
 
 public final class TimeMachineService extends BaseService<TimeMachineService> {
 
@@ -56,7 +57,7 @@ public TimeMachineService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** retrieve a timeMachine (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String timeMachineName) throws Exception {
+  Response retrieveRaw(String timeMachineName) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/time_machines/{time-machine-name}", "time-machine-name", timeMachineName);
@@ -64,13 +65,13 @@ Response retrieveRaw(String timeMachineName) throws Exception {
     return get(path, null);
   }
 
-  public TimeMachineRetrieveResponse retrieve(String timeMachineName) throws Exception {
+  public TimeMachineRetrieveResponse retrieve(String timeMachineName) throws ChargebeeException {
     Response response = retrieveRaw(timeMachineName);
     return TimeMachineRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** travelForward a timeMachine (executes immediately) - returns raw Response. */
-  Response travelForwardRaw(String timeMachineName) throws Exception {
+  Response travelForwardRaw(String timeMachineName) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/time_machines/{time-machine-name}/travel_forward",
@@ -85,7 +86,7 @@ Response travelForwardRaw(String timeMachineName) throws Exception {
    * Response.
    */
   Response travelForwardRaw(String timeMachineName, TimeMachineTravelForwardParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/time_machines/{time-machine-name}/travel_forward",
@@ -98,7 +99,7 @@ Response travelForwardRaw(String timeMachineName, TimeMachineTravelForwardParams
    * travelForward a timeMachine using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response travelForwardRaw(String timeMachineName, String jsonPayload) throws Exception {
+  Response travelForwardRaw(String timeMachineName, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/time_machines/{time-machine-name}/travel_forward",
@@ -108,13 +109,13 @@ Response travelForwardRaw(String timeMachineName, String jsonPayload) throws Exc
   }
 
   public TimeMachineTravelForwardResponse travelForward(
-      String timeMachineName, TimeMachineTravelForwardParams params) throws Exception {
+      String timeMachineName, TimeMachineTravelForwardParams params) throws ChargebeeException {
     Response response = travelForwardRaw(timeMachineName, params);
     return TimeMachineTravelForwardResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** startAfresh a timeMachine (executes immediately) - returns raw Response. */
-  Response startAfreshRaw(String timeMachineName) throws Exception {
+  Response startAfreshRaw(String timeMachineName) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/time_machines/{time-machine-name}/start_afresh",
@@ -128,7 +129,7 @@ Response startAfreshRaw(String timeMachineName) throws Exception {
    * startAfresh a timeMachine using immutable params (executes immediately) - returns raw Response.
    */
   Response startAfreshRaw(String timeMachineName, TimeMachineStartAfreshParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/time_machines/{time-machine-name}/start_afresh",
@@ -140,7 +141,7 @@ Response startAfreshRaw(String timeMachineName, TimeMachineStartAfreshParams par
   /**
    * startAfresh a timeMachine using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response startAfreshRaw(String timeMachineName, String jsonPayload) throws Exception {
+  Response startAfreshRaw(String timeMachineName, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/time_machines/{time-machine-name}/start_afresh",
@@ -150,7 +151,7 @@ Response startAfreshRaw(String timeMachineName, String jsonPayload) throws Excep
   }
 
   public TimeMachineStartAfreshResponse startAfresh(
-      String timeMachineName, TimeMachineStartAfreshParams params) throws Exception {
+      String timeMachineName, TimeMachineStartAfreshParams params) throws ChargebeeException {
     Response response = startAfreshRaw(timeMachineName, params);
     return TimeMachineStartAfreshResponse.fromJson(response.getBodyAsString(), response);
   }
diff --git a/src/main/java/com/chargebee/v4/services/TpSiteUserService.java b/src/main/java/com/chargebee/v4/services/TpSiteUserService.java
new file mode 100644
index 00000000..03c77958
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/TpSiteUserService.java
@@ -0,0 +1,181 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.tpSiteUser.params.UsersForTpSiteUserParams;
+
+import com.chargebee.v4.models.tpSiteUser.params.TpSiteUserPayNowEnableLiveParams;
+
+import com.chargebee.v4.models.tpSiteUser.params.GuestsForTpSiteUserParams;
+
+import com.chargebee.v4.models.tpSiteUser.responses.UsersForTpSiteUserResponse;
+
+import com.chargebee.v4.models.tpSiteUser.responses.TpSiteUserPayNowEnableLiveResponse;
+
+import com.chargebee.v4.models.tpSiteUser.responses.GuestsForTpSiteUserResponse;
+
+public final class TpSiteUserService extends BaseService<TpSiteUserService> {
+
+  private final ServiceConfig config;
+
+  public TpSiteUserService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private TpSiteUserService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private TpSiteUserService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  TpSiteUserService with(RequestOptions newOptions) {
+    return new TpSiteUserService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public TpSiteUserService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * usersForTpSiteUser a tpSiteUser using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response usersForTpSiteUserRaw(String tpSiteUserDomain, UsersForTpSiteUserParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/tp_site_users/{tp-site-user-domain}/users", "tp-site-user-domain", tpSiteUserDomain);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * usersForTpSiteUser a tpSiteUser without params (executes immediately) - returns raw Response.
+   */
+  Response usersForTpSiteUserRaw(String tpSiteUserDomain) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/tp_site_users/{tp-site-user-domain}/users", "tp-site-user-domain", tpSiteUserDomain);
+    return get(path, null);
+  }
+
+  /**
+   * usersForTpSiteUser a tpSiteUser using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response usersForTpSiteUserRaw(String tpSiteUserDomain, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/tp_site_users/{tp-site-user-domain}/users", "tp-site-user-domain", tpSiteUserDomain);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public UsersForTpSiteUserResponse usersForTpSiteUser(
+      String tpSiteUserDomain, UsersForTpSiteUserParams params) throws ChargebeeException {
+    Response response = usersForTpSiteUserRaw(tpSiteUserDomain, params);
+    return UsersForTpSiteUserResponse.fromJson(
+        response.getBodyAsString(), this, params, tpSiteUserDomain, response);
+  }
+
+  public UsersForTpSiteUserResponse usersForTpSiteUser(String tpSiteUserDomain)
+      throws ChargebeeException {
+    Response response = usersForTpSiteUserRaw(tpSiteUserDomain);
+    return UsersForTpSiteUserResponse.fromJson(
+        response.getBodyAsString(), this, null, tpSiteUserDomain, response);
+  }
+
+  /**
+   * payNowEnableLive a tpSiteUser using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response payNowEnableLiveRaw(TpSiteUserPayNowEnableLiveParams params) throws ChargebeeException {
+
+    return post("/tp_site_users/pay_now_enable_live", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * payNowEnableLive a tpSiteUser using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response payNowEnableLiveRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/tp_site_users/pay_now_enable_live", jsonPayload);
+  }
+
+  public TpSiteUserPayNowEnableLiveResponse payNowEnableLive(
+      TpSiteUserPayNowEnableLiveParams params) throws ChargebeeException {
+    Response response = payNowEnableLiveRaw(params);
+
+    return TpSiteUserPayNowEnableLiveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * guestsForTpSiteUser a tpSiteUser using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response guestsForTpSiteUserRaw(String tpSiteUserDomain, GuestsForTpSiteUserParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/tp_site_users/{tp-site-user-domain}/guests", "tp-site-user-domain", tpSiteUserDomain);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * guestsForTpSiteUser a tpSiteUser without params (executes immediately) - returns raw Response.
+   */
+  Response guestsForTpSiteUserRaw(String tpSiteUserDomain) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/tp_site_users/{tp-site-user-domain}/guests", "tp-site-user-domain", tpSiteUserDomain);
+    return get(path, null);
+  }
+
+  /**
+   * guestsForTpSiteUser a tpSiteUser using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response guestsForTpSiteUserRaw(String tpSiteUserDomain, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/tp_site_users/{tp-site-user-domain}/guests", "tp-site-user-domain", tpSiteUserDomain);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public GuestsForTpSiteUserResponse guestsForTpSiteUser(
+      String tpSiteUserDomain, GuestsForTpSiteUserParams params) throws ChargebeeException {
+    Response response = guestsForTpSiteUserRaw(tpSiteUserDomain, params);
+    return GuestsForTpSiteUserResponse.fromJson(
+        response.getBodyAsString(), this, params, tpSiteUserDomain, response);
+  }
+
+  public GuestsForTpSiteUserResponse guestsForTpSiteUser(String tpSiteUserDomain)
+      throws ChargebeeException {
+    Response response = guestsForTpSiteUserRaw(tpSiteUserDomain);
+    return GuestsForTpSiteUserResponse.fromJson(
+        response.getBodyAsString(), this, null, tpSiteUserDomain, response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/TransactionService.java b/src/main/java/com/chargebee/v4/services/TransactionService.java
new file mode 100644
index 00000000..575db5bf
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/TransactionService.java
@@ -0,0 +1,471 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.transaction.params.TransactionListParams;
+
+import com.chargebee.v4.models.transaction.params.TransactionReconcileParams;
+
+import com.chargebee.v4.models.transaction.params.TransactionRefundParams;
+
+import com.chargebee.v4.models.transaction.params.TransactionsForCustomerParams;
+
+import com.chargebee.v4.models.transaction.params.TransactionRecordRefundParams;
+
+import com.chargebee.v4.models.transaction.params.TransactionsForSubscriptionParams;
+
+import com.chargebee.v4.models.transaction.params.TransactionCreateAuthorizationParams;
+
+import com.chargebee.v4.models.transaction.params.TransactionPaymentsForInvoiceParams;
+
+import com.chargebee.v4.models.transaction.params.DeleteOfflineTransactionParams;
+
+import com.chargebee.v4.models.transaction.responses.TransactionListResponse;
+
+import com.chargebee.v4.models.transaction.responses.TransactionReconcileResponse;
+
+import com.chargebee.v4.models.transaction.responses.TransactionRetrieveResponse;
+
+import com.chargebee.v4.models.transaction.responses.TransactionRefundResponse;
+
+import com.chargebee.v4.models.transaction.responses.TransactionsForCustomerResponse;
+
+import com.chargebee.v4.models.transaction.responses.TransactionRecordRefundResponse;
+
+import com.chargebee.v4.models.transaction.responses.TransactionsForSubscriptionResponse;
+
+import com.chargebee.v4.models.transaction.responses.VoidTransactionResponse;
+
+import com.chargebee.v4.models.transaction.responses.SyncTransactionResponse;
+
+import com.chargebee.v4.models.transaction.responses.TransactionCreateAuthorizationResponse;
+
+import com.chargebee.v4.models.transaction.responses.TransactionPaymentsForInvoiceResponse;
+
+import com.chargebee.v4.models.transaction.responses.DeleteOfflineTransactionResponse;
+
+public final class TransactionService extends BaseService<TransactionService> {
+
+  private final ServiceConfig config;
+
+  public TransactionService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private TransactionService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private TransactionService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  TransactionService with(RequestOptions newOptions) {
+    return new TransactionService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public TransactionService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** list a transaction using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(TransactionListParams params) throws ChargebeeException {
+
+    return get("/transactions", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a transaction without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/transactions", null);
+  }
+
+  /** list a transaction using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public TransactionListResponse list(TransactionListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return TransactionListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public TransactionListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return TransactionListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /** reconcile a transaction (executes immediately) - returns raw Response. */
+  Response reconcileRaw(String transactionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/transactions/{transaction-id}/reconcile", "transaction-id", transactionId);
+
+    return post(path, null);
+  }
+
+  /**
+   * reconcile a transaction using immutable params (executes immediately) - returns raw Response.
+   */
+  Response reconcileRaw(String transactionId, TransactionReconcileParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/transactions/{transaction-id}/reconcile", "transaction-id", transactionId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * reconcile a transaction using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response reconcileRaw(String transactionId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/transactions/{transaction-id}/reconcile", "transaction-id", transactionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public TransactionReconcileResponse reconcile(
+      String transactionId, TransactionReconcileParams params) throws ChargebeeException {
+    Response response = reconcileRaw(transactionId, params);
+    return TransactionReconcileResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a transaction (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String transactionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/transactions/{transaction-id}", "transaction-id", transactionId);
+
+    return get(path, null);
+  }
+
+  public TransactionRetrieveResponse retrieve(String transactionId) throws ChargebeeException {
+    Response response = retrieveRaw(transactionId);
+    return TransactionRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** refund a transaction (executes immediately) - returns raw Response. */
+  Response refundRaw(String transactionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/transactions/{transaction-id}/refund", "transaction-id", transactionId);
+
+    return post(path, null);
+  }
+
+  /** refund a transaction using immutable params (executes immediately) - returns raw Response. */
+  Response refundRaw(String transactionId, TransactionRefundParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/transactions/{transaction-id}/refund", "transaction-id", transactionId);
+    return post(path, params.toFormData());
+  }
+
+  /** refund a transaction using raw JSON payload (executes immediately) - returns raw Response. */
+  Response refundRaw(String transactionId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/transactions/{transaction-id}/refund", "transaction-id", transactionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public TransactionRefundResponse refund(String transactionId, TransactionRefundParams params)
+      throws ChargebeeException {
+    Response response = refundRaw(transactionId, params);
+    return TransactionRefundResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * transactionsForCustomer a transaction using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response transactionsForCustomerRaw(String customerId, TransactionsForCustomerParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/transactions", "customer-id", customerId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * transactionsForCustomer a transaction without params (executes immediately) - returns raw
+   * Response.
+   */
+  Response transactionsForCustomerRaw(String customerId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/transactions", "customer-id", customerId);
+    return get(path, null);
+  }
+
+  /**
+   * transactionsForCustomer a transaction using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response transactionsForCustomerRaw(String customerId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams("/customers/{customer-id}/transactions", "customer-id", customerId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public TransactionsForCustomerResponse transactionsForCustomer(
+      String customerId, TransactionsForCustomerParams params) throws ChargebeeException {
+    Response response = transactionsForCustomerRaw(customerId, params);
+    return TransactionsForCustomerResponse.fromJson(
+        response.getBodyAsString(), this, params, customerId, response);
+  }
+
+  public TransactionsForCustomerResponse transactionsForCustomer(String customerId)
+      throws ChargebeeException {
+    Response response = transactionsForCustomerRaw(customerId);
+    return TransactionsForCustomerResponse.fromJson(
+        response.getBodyAsString(), this, null, customerId, response);
+  }
+
+  /** recordRefund a transaction (executes immediately) - returns raw Response. */
+  Response recordRefundRaw(String transactionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/transactions/{transaction-id}/record_refund", "transaction-id", transactionId);
+
+    return post(path, null);
+  }
+
+  /**
+   * recordRefund a transaction using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response recordRefundRaw(String transactionId, TransactionRecordRefundParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/transactions/{transaction-id}/record_refund", "transaction-id", transactionId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * recordRefund a transaction using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response recordRefundRaw(String transactionId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/transactions/{transaction-id}/record_refund", "transaction-id", transactionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public TransactionRecordRefundResponse recordRefund(
+      String transactionId, TransactionRecordRefundParams params) throws ChargebeeException {
+    Response response = recordRefundRaw(transactionId, params);
+    return TransactionRecordRefundResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * transactionsForSubscription a transaction using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response transactionsForSubscriptionRaw(
+      String subscriptionId, TransactionsForSubscriptionParams params) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/transactions", "subscription-id", subscriptionId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * transactionsForSubscription a transaction without params (executes immediately) - returns raw
+   * Response.
+   */
+  Response transactionsForSubscriptionRaw(String subscriptionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/transactions", "subscription-id", subscriptionId);
+    return get(path, null);
+  }
+
+  /**
+   * transactionsForSubscription a transaction using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response transactionsForSubscriptionRaw(String subscriptionId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/transactions", "subscription-id", subscriptionId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public TransactionsForSubscriptionResponse transactionsForSubscription(
+      String subscriptionId, TransactionsForSubscriptionParams params) throws ChargebeeException {
+    Response response = transactionsForSubscriptionRaw(subscriptionId, params);
+    return TransactionsForSubscriptionResponse.fromJson(
+        response.getBodyAsString(), this, params, subscriptionId, response);
+  }
+
+  public TransactionsForSubscriptionResponse transactionsForSubscription(String subscriptionId)
+      throws ChargebeeException {
+    Response response = transactionsForSubscriptionRaw(subscriptionId);
+    return TransactionsForSubscriptionResponse.fromJson(
+        response.getBodyAsString(), this, null, subscriptionId, response);
+  }
+
+  /** voidTransaction a transaction (executes immediately) - returns raw Response. */
+  Response voidTransactionRaw(String transactionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/transactions/{transaction-id}/void", "transaction-id", transactionId);
+
+    return post(path, null);
+  }
+
+  public VoidTransactionResponse voidTransaction(String transactionId) throws ChargebeeException {
+    Response response = voidTransactionRaw(transactionId);
+    return VoidTransactionResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** syncTransaction a transaction (executes immediately) - returns raw Response. */
+  Response syncTransactionRaw(String transactionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams("/transactions/{transaction-id}/sync", "transaction-id", transactionId);
+
+    return post(path, null);
+  }
+
+  public SyncTransactionResponse syncTransaction(String transactionId) throws ChargebeeException {
+    Response response = syncTransactionRaw(transactionId);
+    return SyncTransactionResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createAuthorization a transaction using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response createAuthorizationRaw(TransactionCreateAuthorizationParams params)
+      throws ChargebeeException {
+
+    return post("/transactions/create_authorization", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createAuthorization a transaction using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response createAuthorizationRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/transactions/create_authorization", jsonPayload);
+  }
+
+  public TransactionCreateAuthorizationResponse createAuthorization(
+      TransactionCreateAuthorizationParams params) throws ChargebeeException {
+    Response response = createAuthorizationRaw(params);
+
+    return TransactionCreateAuthorizationResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * paymentsForInvoice a transaction using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response paymentsForInvoiceRaw(String invoiceId, TransactionPaymentsForInvoiceParams params)
+      throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/payments", "invoice-id", invoiceId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /**
+   * paymentsForInvoice a transaction without params (executes immediately) - returns raw Response.
+   */
+  Response paymentsForInvoiceRaw(String invoiceId) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/payments", "invoice-id", invoiceId);
+    return get(path, null);
+  }
+
+  /**
+   * paymentsForInvoice a transaction using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response paymentsForInvoiceRaw(String invoiceId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/invoices/{invoice-id}/payments", "invoice-id", invoiceId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public TransactionPaymentsForInvoiceResponse paymentsForInvoice(
+      String invoiceId, TransactionPaymentsForInvoiceParams params) throws ChargebeeException {
+    Response response = paymentsForInvoiceRaw(invoiceId, params);
+    return TransactionPaymentsForInvoiceResponse.fromJson(
+        response.getBodyAsString(), this, params, invoiceId, response);
+  }
+
+  public TransactionPaymentsForInvoiceResponse paymentsForInvoice(String invoiceId)
+      throws ChargebeeException {
+    Response response = paymentsForInvoiceRaw(invoiceId);
+    return TransactionPaymentsForInvoiceResponse.fromJson(
+        response.getBodyAsString(), this, null, invoiceId, response);
+  }
+
+  /** deleteOfflineTransaction a transaction (executes immediately) - returns raw Response. */
+  Response deleteOfflineTransactionRaw(String transactionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/transactions/{transaction-id}/delete_offline_transaction",
+            "transaction-id",
+            transactionId);
+
+    return post(path, null);
+  }
+
+  /**
+   * deleteOfflineTransaction a transaction using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response deleteOfflineTransactionRaw(String transactionId, DeleteOfflineTransactionParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/transactions/{transaction-id}/delete_offline_transaction",
+            "transaction-id",
+            transactionId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * deleteOfflineTransaction a transaction using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response deleteOfflineTransactionRaw(String transactionId, String jsonPayload)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/transactions/{transaction-id}/delete_offline_transaction",
+            "transaction-id",
+            transactionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public DeleteOfflineTransactionResponse deleteOfflineTransaction(
+      String transactionId, DeleteOfflineTransactionParams params) throws ChargebeeException {
+    Response response = deleteOfflineTransactionRaw(transactionId, params);
+    return DeleteOfflineTransactionResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/UnbilledChargeService.java b/src/main/java/com/chargebee/v4/services/UnbilledChargeService.java
new file mode 100644
index 00000000..47058988
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/UnbilledChargeService.java
@@ -0,0 +1,219 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.unbilledCharge.params.UnbilledChargeInvoiceNowEstimateParams;
+
+import com.chargebee.v4.models.unbilledCharge.params.InvoiceUnbilledChargesParams;
+
+import com.chargebee.v4.models.unbilledCharge.params.UnbilledChargeListParams;
+
+import com.chargebee.v4.models.unbilledCharge.params.UnbilledChargeCreateParams;
+
+import com.chargebee.v4.models.unbilledCharge.params.CreateUnbilledChargeParams;
+
+import com.chargebee.v4.models.unbilledCharge.responses.UnbilledChargeDeleteResponse;
+
+import com.chargebee.v4.models.unbilledCharge.responses.UnbilledChargeInvoiceNowEstimateResponse;
+
+import com.chargebee.v4.models.unbilledCharge.responses.InvoiceUnbilledChargesResponse;
+
+import com.chargebee.v4.models.unbilledCharge.responses.UnbilledChargeListResponse;
+
+import com.chargebee.v4.models.unbilledCharge.responses.UnbilledChargeCreateResponse;
+
+import com.chargebee.v4.models.unbilledCharge.responses.CreateUnbilledChargeResponse;
+
+public final class UnbilledChargeService extends BaseService<UnbilledChargeService> {
+
+  private final ServiceConfig config;
+
+  public UnbilledChargeService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private UnbilledChargeService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private UnbilledChargeService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  UnbilledChargeService with(RequestOptions newOptions) {
+    return new UnbilledChargeService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public UnbilledChargeService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** delete a unbilledCharge (executes immediately) - returns raw Response. */
+  Response deleteRaw(String unbilledChargeId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/unbilled_charges/{unbilled-charge-id}/delete",
+            "unbilled-charge-id",
+            unbilledChargeId);
+
+    return post(path, null);
+  }
+
+  public UnbilledChargeDeleteResponse delete(String unbilledChargeId) throws ChargebeeException {
+    Response response = deleteRaw(unbilledChargeId);
+    return UnbilledChargeDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * invoiceNowEstimate a unbilledCharge using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response invoiceNowEstimateRaw(UnbilledChargeInvoiceNowEstimateParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/unbilled_charges/invoice_now_estimate", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * invoiceNowEstimate a unbilledCharge using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response invoiceNowEstimateRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/unbilled_charges/invoice_now_estimate", jsonPayload);
+  }
+
+  public UnbilledChargeInvoiceNowEstimateResponse invoiceNowEstimate(
+      UnbilledChargeInvoiceNowEstimateParams params) throws ChargebeeException {
+    Response response = invoiceNowEstimateRaw(params);
+
+    return UnbilledChargeInvoiceNowEstimateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * invoiceUnbilledCharges a unbilledCharge using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response invoiceUnbilledChargesRaw(InvoiceUnbilledChargesParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/unbilled_charges/invoice_unbilled_charges", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * invoiceUnbilledCharges a unbilledCharge using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response invoiceUnbilledChargesRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/unbilled_charges/invoice_unbilled_charges", jsonPayload);
+  }
+
+  public InvoiceUnbilledChargesResponse invoiceUnbilledCharges(InvoiceUnbilledChargesParams params)
+      throws ChargebeeException {
+    Response response = invoiceUnbilledChargesRaw(params);
+
+    return InvoiceUnbilledChargesResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** list a unbilledCharge using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(UnbilledChargeListParams params) throws ChargebeeException {
+
+    return get("/unbilled_charges", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a unbilledCharge without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/unbilled_charges", null);
+  }
+
+  /** list a unbilledCharge using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public UnbilledChargeListResponse list(UnbilledChargeListParams params)
+      throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return UnbilledChargeListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public UnbilledChargeListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return UnbilledChargeListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+
+  /**
+   * create a unbilledCharge using immutable params (executes immediately) - returns raw Response.
+   */
+  Response createRaw(UnbilledChargeCreateParams params) throws ChargebeeException {
+
+    return post("/unbilled_charges", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * create a unbilledCharge using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/unbilled_charges", jsonPayload);
+  }
+
+  public UnbilledChargeCreateResponse create(UnbilledChargeCreateParams params)
+      throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return UnbilledChargeCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createUnbilledCharge a unbilledCharge using immutable params (executes immediately) - returns
+   * raw Response.
+   */
+  Response createUnbilledChargeRaw(CreateUnbilledChargeParams params) throws ChargebeeException {
+
+    return post("/unbilled_charges/create", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createUnbilledCharge a unbilledCharge using raw JSON payload (executes immediately) - returns
+   * raw Response.
+   */
+  Response createUnbilledChargeRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/unbilled_charges/create", jsonPayload);
+  }
+
+  public CreateUnbilledChargeResponse createUnbilledCharge(CreateUnbilledChargeParams params)
+      throws ChargebeeException {
+    Response response = createUnbilledChargeRaw(params);
+
+    return CreateUnbilledChargeResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/UnbilledChargesSettingService.java b/src/main/java/com/chargebee/v4/services/UnbilledChargesSettingService.java
similarity index 82%
rename from src/main/java/com/chargebee/v4/core/services/UnbilledChargesSettingService.java
rename to src/main/java/com/chargebee/v4/services/UnbilledChargesSettingService.java
index 96907374..03d3f467 100644
--- a/src/main/java/com/chargebee/v4/core/services/UnbilledChargesSettingService.java
+++ b/src/main/java/com/chargebee/v4/services/UnbilledChargesSettingService.java
@@ -5,15 +5,16 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.unbilledChargesSetting.params.UnbilledChargesSettingRetrieveParams;
+import com.chargebee.v4.models.unbilledChargesSetting.params.UnbilledChargesSettingRetrieveParams;
 
-import com.chargebee.v4.core.responses.unbilledChargesSetting.UnbilledChargesSettingRetrieveResponse;
+import com.chargebee.v4.models.unbilledChargesSetting.responses.UnbilledChargesSettingRetrieveResponse;
 
 public final class UnbilledChargesSettingService
     extends BaseService<UnbilledChargesSettingService> {
@@ -55,7 +56,7 @@ public UnbilledChargesSettingService withOptions(RequestOptions options) {
    * retrieve a unbilledChargesSetting using immutable params (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveRaw(UnbilledChargesSettingRetrieveParams params) throws Exception {
+  Response retrieveRaw(UnbilledChargesSettingRetrieveParams params) throws ChargebeeException {
 
     return get("/unbilled_charges_settings", params != null ? params.toQueryParams() : null);
   }
@@ -64,13 +65,13 @@ Response retrieveRaw(UnbilledChargesSettingRetrieveParams params) throws Excepti
    * retrieve a unbilledChargesSetting using raw JSON payload (executes immediately) - returns raw
    * Response.
    */
-  Response retrieveRaw(String jsonPayload) throws Exception {
+  Response retrieveRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
   public UnbilledChargesSettingRetrieveResponse retrieve(
-      UnbilledChargesSettingRetrieveParams params) throws Exception {
+      UnbilledChargesSettingRetrieveParams params) throws ChargebeeException {
     Response response = retrieveRaw(params);
 
     return UnbilledChargesSettingRetrieveResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/core/services/UsageEventService.java b/src/main/java/com/chargebee/v4/services/UsageEventService.java
similarity index 77%
rename from src/main/java/com/chargebee/v4/core/services/UsageEventService.java
rename to src/main/java/com/chargebee/v4/services/UsageEventService.java
index 3684c19d..7900dc11 100644
--- a/src/main/java/com/chargebee/v4/core/services/UsageEventService.java
+++ b/src/main/java/com/chargebee/v4/services/UsageEventService.java
@@ -5,19 +5,20 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.usageEvent.params.UsageEventCreateParams;
+import com.chargebee.v4.models.usageEvent.params.UsageEventCreateParams;
 
-import com.chargebee.v4.core.models.usageEvent.params.UsageEventBatchIngestParams;
+import com.chargebee.v4.models.usageEvent.params.UsageEventBatchIngestParams;
 
-import com.chargebee.v4.core.responses.usageEvent.UsageEventCreateResponse;
+import com.chargebee.v4.models.usageEvent.responses.UsageEventCreateResponse;
 
-import com.chargebee.v4.core.responses.usageEvent.UsageEventBatchIngestResponse;
+import com.chargebee.v4.models.usageEvent.responses.UsageEventBatchIngestResponse;
 
 public final class UsageEventService extends BaseService<UsageEventService> {
 
@@ -54,18 +55,18 @@ public UsageEventService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** create a usageEvent using immutable params (executes immediately) - returns raw Response. */
-  Response createRaw(UsageEventCreateParams params) throws Exception {
+  Response createRaw(UsageEventCreateParams params) throws ChargebeeException {
 
     return post("/usage_events", params != null ? params.toFormData() : null);
   }
 
   /** create a usageEvent using raw JSON payload (executes immediately) - returns raw Response. */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/usage_events", jsonPayload);
   }
 
-  public UsageEventCreateResponse create(UsageEventCreateParams params) throws Exception {
+  public UsageEventCreateResponse create(UsageEventCreateParams params) throws ChargebeeException {
     Response response = createRaw(params);
 
     return UsageEventCreateResponse.fromJson(response.getBodyAsString(), response);
@@ -74,7 +75,7 @@ public UsageEventCreateResponse create(UsageEventCreateParams params) throws Exc
   /**
    * batchIngest a usageEvent using immutable params (executes immediately) - returns raw Response.
    */
-  Response batchIngestRaw(UsageEventBatchIngestParams params) throws Exception {
+  Response batchIngestRaw(UsageEventBatchIngestParams params) throws ChargebeeException {
 
     return post("/batch/usage_events", params != null ? params.toFormData() : null);
   }
@@ -82,13 +83,13 @@ Response batchIngestRaw(UsageEventBatchIngestParams params) throws Exception {
   /**
    * batchIngest a usageEvent using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response batchIngestRaw(String jsonPayload) throws Exception {
+  Response batchIngestRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/batch/usage_events", jsonPayload);
   }
 
   public UsageEventBatchIngestResponse batchIngest(UsageEventBatchIngestParams params)
-      throws Exception {
+      throws ChargebeeException {
     Response response = batchIngestRaw(params);
 
     return UsageEventBatchIngestResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/core/services/UsageFileService.java b/src/main/java/com/chargebee/v4/services/UsageFileService.java
similarity index 80%
rename from src/main/java/com/chargebee/v4/core/services/UsageFileService.java
rename to src/main/java/com/chargebee/v4/services/UsageFileService.java
index 034aba31..b133745f 100644
--- a/src/main/java/com/chargebee/v4/core/services/UsageFileService.java
+++ b/src/main/java/com/chargebee/v4/services/UsageFileService.java
@@ -5,17 +5,18 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.usageFile.params.UsageFileUploadUrlParams;
+import com.chargebee.v4.models.usageFile.params.UsageFileUploadUrlParams;
 
-import com.chargebee.v4.core.responses.usageFile.UsageFileProcessingStatusResponse;
+import com.chargebee.v4.models.usageFile.responses.UsageFileProcessingStatusResponse;
 
-import com.chargebee.v4.core.responses.usageFile.UsageFileUploadUrlResponse;
+import com.chargebee.v4.models.usageFile.responses.UsageFileUploadUrlResponse;
 
 public final class UsageFileService extends BaseService<UsageFileService> {
 
@@ -52,7 +53,7 @@ public UsageFileService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** processingStatus a usageFile (executes immediately) - returns raw Response. */
-  Response processingStatusRaw(String usageFileId) throws Exception {
+  Response processingStatusRaw(String usageFileId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/usage_files/{usage-file-id}/processing_status", "usage-file-id", usageFileId);
@@ -60,24 +61,26 @@ Response processingStatusRaw(String usageFileId) throws Exception {
     return get(path, null);
   }
 
-  public UsageFileProcessingStatusResponse processingStatus(String usageFileId) throws Exception {
+  public UsageFileProcessingStatusResponse processingStatus(String usageFileId)
+      throws ChargebeeException {
     Response response = processingStatusRaw(usageFileId);
     return UsageFileProcessingStatusResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** uploadUrl a usageFile using immutable params (executes immediately) - returns raw Response. */
-  Response uploadUrlRaw(UsageFileUploadUrlParams params) throws Exception {
+  Response uploadUrlRaw(UsageFileUploadUrlParams params) throws ChargebeeException {
 
     return post("/usage_files/upload_url", params != null ? params.toFormData() : null);
   }
 
   /** uploadUrl a usageFile using raw JSON payload (executes immediately) - returns raw Response. */
-  Response uploadUrlRaw(String jsonPayload) throws Exception {
+  Response uploadUrlRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/usage_files/upload_url", jsonPayload);
   }
 
-  public UsageFileUploadUrlResponse uploadUrl(UsageFileUploadUrlParams params) throws Exception {
+  public UsageFileUploadUrlResponse uploadUrl(UsageFileUploadUrlParams params)
+      throws ChargebeeException {
     Response response = uploadUrlRaw(params);
 
     return UsageFileUploadUrlResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/services/UsageService.java b/src/main/java/com/chargebee/v4/services/UsageService.java
new file mode 100644
index 00000000..036f7206
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/UsageService.java
@@ -0,0 +1,206 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.usage.params.UsagePdfParams;
+
+import com.chargebee.v4.models.usage.params.UsageRetrieveParams;
+
+import com.chargebee.v4.models.usage.params.UsageCreateParams;
+
+import com.chargebee.v4.models.usage.params.UsageDeleteParams;
+
+import com.chargebee.v4.models.usage.params.UsageListParams;
+
+import com.chargebee.v4.models.usage.responses.UsagePdfResponse;
+
+import com.chargebee.v4.models.usage.responses.UsageRetrieveResponse;
+
+import com.chargebee.v4.models.usage.responses.UsageCreateResponse;
+
+import com.chargebee.v4.models.usage.responses.UsageDeleteResponse;
+
+import com.chargebee.v4.models.usage.responses.UsageListResponse;
+
+public final class UsageService extends BaseService<UsageService> {
+
+  private final ServiceConfig config;
+
+  public UsageService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private UsageService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private UsageService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  UsageService with(RequestOptions newOptions) {
+    return new UsageService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public UsageService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** pdf a usage using immutable params (executes immediately) - returns raw Response. */
+  Response pdfRaw(UsagePdfParams params) throws ChargebeeException {
+
+    return post("/usages/pdf", params != null ? params.toFormData() : null);
+  }
+
+  /** pdf a usage using raw JSON payload (executes immediately) - returns raw Response. */
+  Response pdfRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/usages/pdf", jsonPayload);
+  }
+
+  public UsagePdfResponse pdf(UsagePdfParams params) throws ChargebeeException {
+    Response response = pdfRaw(params);
+
+    return UsagePdfResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a usage (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String subscriptionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/usages", "subscription-id", subscriptionId);
+
+    return get(path, null);
+  }
+
+  /** retrieve a usage using immutable params (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String subscriptionId, UsageRetrieveParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/usages", "subscription-id", subscriptionId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  public UsageRetrieveResponse retrieve(String subscriptionId, UsageRetrieveParams params)
+      throws ChargebeeException {
+    Response response = retrieveRaw(subscriptionId, params);
+    return UsageRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  public UsageRetrieveResponse retrieve(String subscriptionId) throws ChargebeeException {
+    Response response = retrieveRaw(subscriptionId);
+    return UsageRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** create a usage (executes immediately) - returns raw Response. */
+  Response createRaw(String subscriptionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/usages", "subscription-id", subscriptionId);
+
+    return post(path, null);
+  }
+
+  /** create a usage using immutable params (executes immediately) - returns raw Response. */
+  Response createRaw(String subscriptionId, UsageCreateParams params) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/usages", "subscription-id", subscriptionId);
+    return post(path, params.toFormData());
+  }
+
+  /** create a usage using raw JSON payload (executes immediately) - returns raw Response. */
+  Response createRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/usages", "subscription-id", subscriptionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public UsageCreateResponse create(String subscriptionId, UsageCreateParams params)
+      throws ChargebeeException {
+    Response response = createRaw(subscriptionId, params);
+    return UsageCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** delete a usage (executes immediately) - returns raw Response. */
+  Response deleteRaw(String subscriptionId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/delete_usage", "subscription-id", subscriptionId);
+
+    return post(path, null);
+  }
+
+  /** delete a usage using immutable params (executes immediately) - returns raw Response. */
+  Response deleteRaw(String subscriptionId, UsageDeleteParams params) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/delete_usage", "subscription-id", subscriptionId);
+    return post(path, params.toFormData());
+  }
+
+  /** delete a usage using raw JSON payload (executes immediately) - returns raw Response. */
+  Response deleteRaw(String subscriptionId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/subscriptions/{subscription-id}/delete_usage", "subscription-id", subscriptionId);
+    return postJson(path, jsonPayload);
+  }
+
+  public UsageDeleteResponse delete(String subscriptionId, UsageDeleteParams params)
+      throws ChargebeeException {
+    Response response = deleteRaw(subscriptionId, params);
+    return UsageDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** list a usage using immutable params (executes immediately) - returns raw Response. */
+  Response listRaw(UsageListParams params) throws ChargebeeException {
+
+    return get("/usages", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a usage without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/usages", null);
+  }
+
+  /** list a usage using raw JSON payload (executes immediately) - returns raw Response. */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public UsageListResponse list(UsageListParams params) throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return UsageListResponse.fromJson(response.getBodyAsString(), this, params, response);
+  }
+
+  public UsageListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return UsageListResponse.fromJson(response.getBodyAsString(), this, null, response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/VariantService.java b/src/main/java/com/chargebee/v4/services/VariantService.java
new file mode 100644
index 00000000..9c95f3ac
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/VariantService.java
@@ -0,0 +1,195 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.variant.params.ListProductVariantsParams;
+
+import com.chargebee.v4.models.variant.params.CreateProductVariantParams;
+
+import com.chargebee.v4.models.variant.params.VariantUpdateParams;
+
+import com.chargebee.v4.models.variant.responses.ListProductVariantsResponse;
+
+import com.chargebee.v4.models.variant.responses.CreateProductVariantResponse;
+
+import com.chargebee.v4.models.variant.responses.VariantRetrieveResponse;
+
+import com.chargebee.v4.models.variant.responses.VariantUpdateResponse;
+
+import com.chargebee.v4.models.variant.responses.VariantDeleteResponse;
+
+public final class VariantService extends BaseService<VariantService> {
+
+  private final ServiceConfig config;
+
+  public VariantService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private VariantService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private VariantService(ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  VariantService with(RequestOptions newOptions) {
+    return new VariantService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public VariantService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /**
+   * listProductVariants a variant using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response listProductVariantsRaw(String productId, ListProductVariantsParams params)
+      throws ChargebeeException {
+    String path = buildPathWithParams("/products/{product-id}/variants", "product-id", productId);
+    return get(path, params != null ? params.toQueryParams() : null);
+  }
+
+  /** listProductVariants a variant without params (executes immediately) - returns raw Response. */
+  Response listProductVariantsRaw(String productId) throws ChargebeeException {
+    String path = buildPathWithParams("/products/{product-id}/variants", "product-id", productId);
+    return get(path, null);
+  }
+
+  /**
+   * listProductVariants a variant using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response listProductVariantsRaw(String productId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/products/{product-id}/variants", "product-id", productId);
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public ListProductVariantsResponse listProductVariants(
+      String productId, ListProductVariantsParams params) throws ChargebeeException {
+    Response response = listProductVariantsRaw(productId, params);
+    return ListProductVariantsResponse.fromJson(
+        response.getBodyAsString(), this, params, productId, response);
+  }
+
+  public ListProductVariantsResponse listProductVariants(String productId)
+      throws ChargebeeException {
+    Response response = listProductVariantsRaw(productId);
+    return ListProductVariantsResponse.fromJson(
+        response.getBodyAsString(), this, null, productId, response);
+  }
+
+  /** createProductVariant a variant (executes immediately) - returns raw Response. */
+  Response createProductVariantRaw(String productId) throws ChargebeeException {
+    String path = buildPathWithParams("/products/{product-id}/variants", "product-id", productId);
+
+    return post(path, null);
+  }
+
+  /**
+   * createProductVariant a variant using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response createProductVariantRaw(String productId, CreateProductVariantParams params)
+      throws ChargebeeException {
+    String path = buildPathWithParams("/products/{product-id}/variants", "product-id", productId);
+    return post(path, params.toFormData());
+  }
+
+  /**
+   * createProductVariant a variant using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response createProductVariantRaw(String productId, String jsonPayload) throws ChargebeeException {
+    String path = buildPathWithParams("/products/{product-id}/variants", "product-id", productId);
+    return postJson(path, jsonPayload);
+  }
+
+  public CreateProductVariantResponse createProductVariant(
+      String productId, CreateProductVariantParams params) throws ChargebeeException {
+    Response response = createProductVariantRaw(productId, params);
+    return CreateProductVariantResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a variant (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String productVariantId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/variants/{product-variant-id}", "product-variant-id", productVariantId);
+
+    return get(path, null);
+  }
+
+  public VariantRetrieveResponse retrieve(String productVariantId) throws ChargebeeException {
+    Response response = retrieveRaw(productVariantId);
+    return VariantRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** update a variant (executes immediately) - returns raw Response. */
+  Response updateRaw(String productVariantId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/variants/{product-variant-id}", "product-variant-id", productVariantId);
+
+    return post(path, null);
+  }
+
+  /** update a variant using immutable params (executes immediately) - returns raw Response. */
+  Response updateRaw(String productVariantId, VariantUpdateParams params)
+      throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/variants/{product-variant-id}", "product-variant-id", productVariantId);
+    return post(path, params.toFormData());
+  }
+
+  /** update a variant using raw JSON payload (executes immediately) - returns raw Response. */
+  Response updateRaw(String productVariantId, String jsonPayload) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/variants/{product-variant-id}", "product-variant-id", productVariantId);
+    return postJson(path, jsonPayload);
+  }
+
+  public VariantUpdateResponse update(String productVariantId, VariantUpdateParams params)
+      throws ChargebeeException {
+    Response response = updateRaw(productVariantId, params);
+    return VariantUpdateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** delete a variant (executes immediately) - returns raw Response. */
+  Response deleteRaw(String productVariantId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/variants/{product-variant-id}/delete", "product-variant-id", productVariantId);
+
+    return post(path, null);
+  }
+
+  public VariantDeleteResponse delete(String productVariantId) throws ChargebeeException {
+    Response response = deleteRaw(productVariantId);
+    return VariantDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/services/VirtualBankAccountService.java b/src/main/java/com/chargebee/v4/services/VirtualBankAccountService.java
new file mode 100644
index 00000000..24a952f6
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/services/VirtualBankAccountService.java
@@ -0,0 +1,227 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * For more information on how to make changes to this file, please see the README.
+ * Reach out to dx@chargebee.com for any questions.
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.services;
+
+import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
+import com.chargebee.v4.transport.Response;
+
+import com.chargebee.v4.models.virtualBankAccount.params.VirtualBankAccountListParams;
+
+import com.chargebee.v4.models.virtualBankAccount.params.VirtualBankAccountCreateParams;
+
+import com.chargebee.v4.models.virtualBankAccount.params.VirtualBankAccountCreateUsingPermanentTokenParams;
+
+import com.chargebee.v4.models.virtualBankAccount.responses.VirtualBankAccountDeleteLocalResponse;
+
+import com.chargebee.v4.models.virtualBankAccount.responses.VirtualBankAccountDeleteResponse;
+
+import com.chargebee.v4.models.virtualBankAccount.responses.VirtualBankAccountListResponse;
+
+import com.chargebee.v4.models.virtualBankAccount.responses.VirtualBankAccountCreateResponse;
+
+import com.chargebee.v4.models.virtualBankAccount.responses.VirtualBankAccountSyncFundResponse;
+
+import com.chargebee.v4.models.virtualBankAccount.responses.VirtualBankAccountRetrieveResponse;
+
+import com.chargebee.v4.models.virtualBankAccount.responses.VirtualBankAccountCreateUsingPermanentTokenResponse;
+
+public final class VirtualBankAccountService extends BaseService<VirtualBankAccountService> {
+
+  private final ServiceConfig config;
+
+  public VirtualBankAccountService(ChargebeeClient client) {
+    super(client);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private VirtualBankAccountService(ChargebeeClient client, RequestOptions options) {
+    super(client, options);
+    this.config = ServiceConfig.defaultConfig();
+  }
+
+  private VirtualBankAccountService(
+      ChargebeeClient client, RequestOptions options, ServiceConfig config) {
+    super(client, options);
+    this.config = config;
+  }
+
+  @Override
+  VirtualBankAccountService with(RequestOptions newOptions) {
+    return new VirtualBankAccountService(client, newOptions, config);
+  }
+
+  /**
+   * Apply per-request options for this service instance. Users can chain .withOptions or .options
+   * to set headers and other options.
+   */
+  public VirtualBankAccountService withOptions(RequestOptions options) {
+    return with(options);
+  }
+
+  // === Operations ===
+
+  /** deleteLocal a virtualBankAccount (executes immediately) - returns raw Response. */
+  Response deleteLocalRaw(String virtualBankAccountId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/virtual_bank_accounts/{virtual-bank-account-id}/delete_local",
+            "virtual-bank-account-id",
+            virtualBankAccountId);
+
+    return post(path, null);
+  }
+
+  public VirtualBankAccountDeleteLocalResponse deleteLocal(String virtualBankAccountId)
+      throws ChargebeeException {
+    Response response = deleteLocalRaw(virtualBankAccountId);
+    return VirtualBankAccountDeleteLocalResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** delete a virtualBankAccount (executes immediately) - returns raw Response. */
+  Response deleteRaw(String virtualBankAccountId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/virtual_bank_accounts/{virtual-bank-account-id}/delete",
+            "virtual-bank-account-id",
+            virtualBankAccountId);
+
+    return post(path, null);
+  }
+
+  public VirtualBankAccountDeleteResponse delete(String virtualBankAccountId)
+      throws ChargebeeException {
+    Response response = deleteRaw(virtualBankAccountId);
+    return VirtualBankAccountDeleteResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * list a virtualBankAccount using immutable params (executes immediately) - returns raw Response.
+   */
+  Response listRaw(VirtualBankAccountListParams params) throws ChargebeeException {
+
+    return get("/virtual_bank_accounts", params != null ? params.toQueryParams() : null);
+  }
+
+  /** list a virtualBankAccount without params (executes immediately) - returns raw Response. */
+  Response listRaw() throws ChargebeeException {
+
+    return get("/virtual_bank_accounts", null);
+  }
+
+  /**
+   * list a virtualBankAccount using raw JSON payload (executes immediately) - returns raw Response.
+   */
+  Response listRaw(String jsonPayload) throws ChargebeeException {
+
+    throw new UnsupportedOperationException("JSON payload not supported for GET operations");
+  }
+
+  public VirtualBankAccountListResponse list(VirtualBankAccountListParams params)
+      throws ChargebeeException {
+    Response response = listRaw(params);
+
+    return VirtualBankAccountListResponse.fromJson(
+        response.getBodyAsString(), this, params, response);
+  }
+
+  public VirtualBankAccountListResponse list() throws ChargebeeException {
+    Response response = listRaw();
+    return VirtualBankAccountListResponse.fromJson(
+        response.getBodyAsString(), this, null, response);
+  }
+
+  /**
+   * create a virtualBankAccount using immutable params (executes immediately) - returns raw
+   * Response.
+   */
+  Response createRaw(VirtualBankAccountCreateParams params) throws ChargebeeException {
+
+    return post("/virtual_bank_accounts", params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * create a virtualBankAccount using raw JSON payload (executes immediately) - returns raw
+   * Response.
+   */
+  Response createRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/virtual_bank_accounts", jsonPayload);
+  }
+
+  public VirtualBankAccountCreateResponse create(VirtualBankAccountCreateParams params)
+      throws ChargebeeException {
+    Response response = createRaw(params);
+
+    return VirtualBankAccountCreateResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** syncFund a virtualBankAccount (executes immediately) - returns raw Response. */
+  Response syncFundRaw(String virtualBankAccountId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/virtual_bank_accounts/{virtual-bank-account-id}/sync_fund",
+            "virtual-bank-account-id",
+            virtualBankAccountId);
+
+    return post(path, null);
+  }
+
+  public VirtualBankAccountSyncFundResponse syncFund(String virtualBankAccountId)
+      throws ChargebeeException {
+    Response response = syncFundRaw(virtualBankAccountId);
+    return VirtualBankAccountSyncFundResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /** retrieve a virtualBankAccount (executes immediately) - returns raw Response. */
+  Response retrieveRaw(String virtualBankAccountId) throws ChargebeeException {
+    String path =
+        buildPathWithParams(
+            "/virtual_bank_accounts/{virtual-bank-account-id}",
+            "virtual-bank-account-id",
+            virtualBankAccountId);
+
+    return get(path, null);
+  }
+
+  public VirtualBankAccountRetrieveResponse retrieve(String virtualBankAccountId)
+      throws ChargebeeException {
+    Response response = retrieveRaw(virtualBankAccountId);
+    return VirtualBankAccountRetrieveResponse.fromJson(response.getBodyAsString(), response);
+  }
+
+  /**
+   * createUsingPermanentToken a virtualBankAccount using immutable params (executes immediately) -
+   * returns raw Response.
+   */
+  Response createUsingPermanentTokenRaw(VirtualBankAccountCreateUsingPermanentTokenParams params)
+      throws ChargebeeException {
+
+    return post(
+        "/virtual_bank_accounts/create_using_permanent_token",
+        params != null ? params.toFormData() : null);
+  }
+
+  /**
+   * createUsingPermanentToken a virtualBankAccount using raw JSON payload (executes immediately) -
+   * returns raw Response.
+   */
+  Response createUsingPermanentTokenRaw(String jsonPayload) throws ChargebeeException {
+
+    return postJson("/virtual_bank_accounts/create_using_permanent_token", jsonPayload);
+  }
+
+  public VirtualBankAccountCreateUsingPermanentTokenResponse createUsingPermanentToken(
+      VirtualBankAccountCreateUsingPermanentTokenParams params) throws ChargebeeException {
+    Response response = createUsingPermanentTokenRaw(params);
+
+    return VirtualBankAccountCreateUsingPermanentTokenResponse.fromJson(
+        response.getBodyAsString(), response);
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/core/services/WebhookEndpointService.java b/src/main/java/com/chargebee/v4/services/WebhookEndpointService.java
similarity index 76%
rename from src/main/java/com/chargebee/v4/core/services/WebhookEndpointService.java
rename to src/main/java/com/chargebee/v4/services/WebhookEndpointService.java
index 0d0c4ff8..4d3589a9 100644
--- a/src/main/java/com/chargebee/v4/core/services/WebhookEndpointService.java
+++ b/src/main/java/com/chargebee/v4/services/WebhookEndpointService.java
@@ -5,27 +5,28 @@
  * Copyright 2025 Chargebee Inc.
  */
 
-package com.chargebee.v4.core.services;
+package com.chargebee.v4.services;
 
 import com.chargebee.v4.client.ChargebeeClient;
 import com.chargebee.v4.client.request.RequestOptions;
+import com.chargebee.v4.exceptions.ChargebeeException;
 import com.chargebee.v4.transport.Response;
 
-import com.chargebee.v4.core.models.webhookEndpoint.params.WebhookEndpointUpdateParams;
+import com.chargebee.v4.models.webhookEndpoint.params.WebhookEndpointUpdateParams;
 
-import com.chargebee.v4.core.models.webhookEndpoint.params.WebhookEndpointListParams;
+import com.chargebee.v4.models.webhookEndpoint.params.WebhookEndpointListParams;
 
-import com.chargebee.v4.core.models.webhookEndpoint.params.WebhookEndpointCreateParams;
+import com.chargebee.v4.models.webhookEndpoint.params.WebhookEndpointCreateParams;
 
-import com.chargebee.v4.core.responses.webhookEndpoint.WebhookEndpointDeleteResponse;
+import com.chargebee.v4.models.webhookEndpoint.responses.WebhookEndpointDeleteResponse;
 
-import com.chargebee.v4.core.responses.webhookEndpoint.WebhookEndpointRetrieveResponse;
+import com.chargebee.v4.models.webhookEndpoint.responses.WebhookEndpointRetrieveResponse;
 
-import com.chargebee.v4.core.responses.webhookEndpoint.WebhookEndpointUpdateResponse;
+import com.chargebee.v4.models.webhookEndpoint.responses.WebhookEndpointUpdateResponse;
 
-import com.chargebee.v4.core.responses.webhookEndpoint.WebhookEndpointListResponse;
+import com.chargebee.v4.models.webhookEndpoint.responses.WebhookEndpointListResponse;
 
-import com.chargebee.v4.core.responses.webhookEndpoint.WebhookEndpointCreateResponse;
+import com.chargebee.v4.models.webhookEndpoint.responses.WebhookEndpointCreateResponse;
 
 public final class WebhookEndpointService extends BaseService<WebhookEndpointService> {
 
@@ -63,7 +64,7 @@ public WebhookEndpointService withOptions(RequestOptions options) {
   // === Operations ===
 
   /** delete a webhookEndpoint (executes immediately) - returns raw Response. */
-  Response deleteRaw(String webhookEndpointId) throws Exception {
+  Response deleteRaw(String webhookEndpointId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/webhook_endpoints/{webhook-endpoint-id}/delete",
@@ -73,13 +74,13 @@ Response deleteRaw(String webhookEndpointId) throws Exception {
     return post(path, null);
   }
 
-  public WebhookEndpointDeleteResponse delete(String webhookEndpointId) throws Exception {
+  public WebhookEndpointDeleteResponse delete(String webhookEndpointId) throws ChargebeeException {
     Response response = deleteRaw(webhookEndpointId);
     return WebhookEndpointDeleteResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** retrieve a webhookEndpoint (executes immediately) - returns raw Response. */
-  Response retrieveRaw(String webhookEndpointId) throws Exception {
+  Response retrieveRaw(String webhookEndpointId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/webhook_endpoints/{webhook-endpoint-id}", "webhook-endpoint-id", webhookEndpointId);
@@ -87,13 +88,14 @@ Response retrieveRaw(String webhookEndpointId) throws Exception {
     return get(path, null);
   }
 
-  public WebhookEndpointRetrieveResponse retrieve(String webhookEndpointId) throws Exception {
+  public WebhookEndpointRetrieveResponse retrieve(String webhookEndpointId)
+      throws ChargebeeException {
     Response response = retrieveRaw(webhookEndpointId);
     return WebhookEndpointRetrieveResponse.fromJson(response.getBodyAsString(), response);
   }
 
   /** update a webhookEndpoint (executes immediately) - returns raw Response. */
-  Response updateRaw(String webhookEndpointId) throws Exception {
+  Response updateRaw(String webhookEndpointId) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/webhook_endpoints/{webhook-endpoint-id}", "webhook-endpoint-id", webhookEndpointId);
@@ -105,7 +107,7 @@ Response updateRaw(String webhookEndpointId) throws Exception {
    * update a webhookEndpoint using immutable params (executes immediately) - returns raw Response.
    */
   Response updateRaw(String webhookEndpointId, WebhookEndpointUpdateParams params)
-      throws Exception {
+      throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/webhook_endpoints/{webhook-endpoint-id}", "webhook-endpoint-id", webhookEndpointId);
@@ -115,7 +117,7 @@ Response updateRaw(String webhookEndpointId, WebhookEndpointUpdateParams params)
   /**
    * update a webhookEndpoint using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response updateRaw(String webhookEndpointId, String jsonPayload) throws Exception {
+  Response updateRaw(String webhookEndpointId, String jsonPayload) throws ChargebeeException {
     String path =
         buildPathWithParams(
             "/webhook_endpoints/{webhook-endpoint-id}", "webhook-endpoint-id", webhookEndpointId);
@@ -123,7 +125,7 @@ Response updateRaw(String webhookEndpointId, String jsonPayload) throws Exceptio
   }
 
   public WebhookEndpointUpdateResponse update(
-      String webhookEndpointId, WebhookEndpointUpdateParams params) throws Exception {
+      String webhookEndpointId, WebhookEndpointUpdateParams params) throws ChargebeeException {
     Response response = updateRaw(webhookEndpointId, params);
     return WebhookEndpointUpdateResponse.fromJson(response.getBodyAsString(), response);
   }
@@ -131,13 +133,13 @@ public WebhookEndpointUpdateResponse update(
   /**
    * list a webhookEndpoint using immutable params (executes immediately) - returns raw Response.
    */
-  Response listRaw(WebhookEndpointListParams params) throws Exception {
+  Response listRaw(WebhookEndpointListParams params) throws ChargebeeException {
 
     return get("/webhook_endpoints", params != null ? params.toQueryParams() : null);
   }
 
   /** list a webhookEndpoint without params (executes immediately) - returns raw Response. */
-  Response listRaw() throws Exception {
+  Response listRaw() throws ChargebeeException {
 
     return get("/webhook_endpoints", null);
   }
@@ -145,18 +147,19 @@ Response listRaw() throws Exception {
   /**
    * list a webhookEndpoint using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response listRaw(String jsonPayload) throws Exception {
+  Response listRaw(String jsonPayload) throws ChargebeeException {
 
     throw new UnsupportedOperationException("JSON payload not supported for GET operations");
   }
 
-  public WebhookEndpointListResponse list(WebhookEndpointListParams params) throws Exception {
+  public WebhookEndpointListResponse list(WebhookEndpointListParams params)
+      throws ChargebeeException {
     Response response = listRaw(params);
 
     return WebhookEndpointListResponse.fromJson(response.getBodyAsString(), this, params, response);
   }
 
-  public WebhookEndpointListResponse list() throws Exception {
+  public WebhookEndpointListResponse list() throws ChargebeeException {
     Response response = listRaw();
     return WebhookEndpointListResponse.fromJson(response.getBodyAsString(), this, null, response);
   }
@@ -164,7 +167,7 @@ public WebhookEndpointListResponse list() throws Exception {
   /**
    * create a webhookEndpoint using immutable params (executes immediately) - returns raw Response.
    */
-  Response createRaw(WebhookEndpointCreateParams params) throws Exception {
+  Response createRaw(WebhookEndpointCreateParams params) throws ChargebeeException {
 
     return post("/webhook_endpoints", params != null ? params.toFormData() : null);
   }
@@ -172,12 +175,13 @@ Response createRaw(WebhookEndpointCreateParams params) throws Exception {
   /**
    * create a webhookEndpoint using raw JSON payload (executes immediately) - returns raw Response.
    */
-  Response createRaw(String jsonPayload) throws Exception {
+  Response createRaw(String jsonPayload) throws ChargebeeException {
 
     return postJson("/webhook_endpoints", jsonPayload);
   }
 
-  public WebhookEndpointCreateResponse create(WebhookEndpointCreateParams params) throws Exception {
+  public WebhookEndpointCreateResponse create(WebhookEndpointCreateParams params)
+      throws ChargebeeException {
     Response response = createRaw(params);
 
     return WebhookEndpointCreateResponse.fromJson(response.getBodyAsString(), response);
diff --git a/src/main/java/com/chargebee/v4/transport/ClientErrorException.java b/src/main/java/com/chargebee/v4/transport/ClientErrorException.java
deleted file mode 100644
index a1d0769b..00000000
--- a/src/main/java/com/chargebee/v4/transport/ClientErrorException.java
+++ /dev/null
@@ -1,51 +0,0 @@
-package com.chargebee.v4.transport;
-
-/**
- * Exception for 4xx HTTP status codes (client errors).
- * Indicates issues with the request (bad request, unauthorized, not found, etc.).
- */
-public class ClientErrorException extends HttpException {
-    
-    public ClientErrorException(int statusCode, String message, Response response) {
-        super(statusCode, message, response);
-    }
-    
-    public ClientErrorException(int statusCode, String message, Response response, Throwable cause) {
-        super(statusCode, message, response, cause);
-    }
-    
-    /**
-     * Check if this is a specific client error type.
-     */
-    public boolean isBadRequest() {
-        return getStatusCode() == 400;
-    }
-    
-    public boolean isUnauthorized() {
-        return getStatusCode() == 401;
-    }
-    
-    public boolean isForbidden() {
-        return getStatusCode() == 403;
-    }
-    
-    public boolean isNotFound() {
-        return getStatusCode() == 404;
-    }
-    
-    public boolean isMethodNotAllowed() {
-        return getStatusCode() == 405;
-    }
-    
-    public boolean isConflict() {
-        return getStatusCode() == 409;
-    }
-    
-    public boolean isUnprocessableEntity() {
-        return getStatusCode() == 422;
-    }
-    
-    public boolean isTooManyRequests() {
-        return getStatusCode() == 429;
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/com/chargebee/v4/transport/ConfigurationException.java b/src/main/java/com/chargebee/v4/transport/ConfigurationException.java
deleted file mode 100644
index 4b37062e..00000000
--- a/src/main/java/com/chargebee/v4/transport/ConfigurationException.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.chargebee.v4.transport;
-
-/**
- * Exception thrown when there's an issue with transport or client configuration.
- * This is a runtime exception to allow fluent builder usage.
- */
-public class ConfigurationException extends RuntimeException {
-    
-    public ConfigurationException(String message) {
-        super(message);
-    }
-    
-    public ConfigurationException(String message, Throwable cause) {
-        super(message, cause);
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/com/chargebee/v4/transport/ConsoleRequestLogger.java b/src/main/java/com/chargebee/v4/transport/ConsoleRequestLogger.java
index a6dc7ab3..c00c9cf0 100644
--- a/src/main/java/com/chargebee/v4/transport/ConsoleRequestLogger.java
+++ b/src/main/java/com/chargebee/v4/transport/ConsoleRequestLogger.java
@@ -1,5 +1,7 @@
 package com.chargebee.v4.transport;
 
+import com.chargebee.v4.exceptions.HttpException;
+
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 import java.util.List;
diff --git a/src/main/java/com/chargebee/v4/transport/DefaultTransport.java b/src/main/java/com/chargebee/v4/transport/DefaultTransport.java
index 81ce9ab8..7c43abd3 100644
--- a/src/main/java/com/chargebee/v4/transport/DefaultTransport.java
+++ b/src/main/java/com/chargebee/v4/transport/DefaultTransport.java
@@ -1,5 +1,7 @@
 package com.chargebee.v4.transport;
 
+import com.chargebee.v4.exceptions.*;
+
 import java.io.*;
 import java.net.*;
 import java.nio.charset.StandardCharsets;
@@ -43,7 +45,7 @@ public DefaultTransport(TransportConfig config) {
     }
     
     @Override
-    public Response send(Request request) throws TransportException {
+    public Response send(Request request) {
         RequestLogger logger = config.getRequestLogger();
         long startTime = System.currentTimeMillis();
         
@@ -83,22 +85,22 @@ public Response send(Request request) throws TransportException {
             }
             throw e;
         } catch (SocketTimeoutException e) {
-            String timeoutType = e.getMessage().contains("connect") ? "connect" : "read";
-            TimeoutException timeoutException = new TimeoutException(timeoutType, "Request timed out", e);
+            String timeoutType = e.getMessage() != null && e.getMessage().contains("connect") ? "connect" : "read";
+            TimeoutException timeoutException = new TimeoutException(timeoutType, "Request timed out", e, request);
             if (logger != null && logger.isEnabled()) {
                 long duration = System.currentTimeMillis() - startTime;
                 logger.logError(request, timeoutException, duration);
             }
             throw timeoutException;
         } catch (UnknownHostException | NoRouteToHostException e) {
-            NetworkException networkException = new NetworkException("Network connectivity issue", e);
+            NetworkException networkException = new NetworkException("Network connectivity issue: " + e.getMessage(), e, request);
             if (logger != null && logger.isEnabled()) {
                 long duration = System.currentTimeMillis() - startTime;
                 logger.logError(request, networkException, duration);
             }
             throw networkException;
         } catch (IOException e) {
-            NetworkException networkException = new NetworkException("Network error", e);
+            NetworkException networkException = new NetworkException("Network error: " + e.getMessage(), e, request);
             if (logger != null && logger.isEnabled()) {
                 long duration = System.currentTimeMillis() - startTime;
                 logger.logError(request, networkException, duration);
@@ -124,7 +126,7 @@ public CompletableFuture<Response> sendAsync(Request request) {
         return future;
     }
     
-    private HttpURLConnection createConnection(Request request) throws IOException, TransportException {
+    private HttpURLConnection createConnection(Request request) throws IOException {
         String fullUrl = buildFullUrl(request);
         
         URL url;
@@ -281,7 +283,7 @@ private void writeRequestBody(HttpURLConnection connection, Request request) thr
         }
     }
     
-    private Response readResponse(HttpURLConnection connection) throws IOException, TransportException {
+    private Response readResponse(HttpURLConnection connection) throws IOException {
         int statusCode = connection.getResponseCode();
         Map<String, List<String>> headers = connection.getHeaderFields();
 
diff --git a/src/main/java/com/chargebee/v4/transport/HttpException.java b/src/main/java/com/chargebee/v4/transport/HttpException.java
deleted file mode 100644
index e7fbde26..00000000
--- a/src/main/java/com/chargebee/v4/transport/HttpException.java
+++ /dev/null
@@ -1,49 +0,0 @@
-package com.chargebee.v4.transport;
-
-/**
- * Base exception for HTTP status code errors (4xx, 5xx).
- * Contains the HTTP response information for error handling.
- */
-public class HttpException extends TransportException {
-    private final int statusCode;
-    private final Response response;
-    
-    public HttpException(int statusCode, String message, Response response) {
-        super(message);
-        this.statusCode = statusCode;
-        this.response = response;
-    }
-    
-    public HttpException(int statusCode, String message, Response response, Throwable cause) {
-        super(message, cause);
-        this.statusCode = statusCode;
-        this.response = response;
-    }
-    
-    /**
-     * Get the HTTP status code.
-     */
-    public int getStatusCode() {
-        return statusCode;
-    }
-    
-    /**
-     * Get the full HTTP response.
-     */
-    public Response getResponse() {
-        return response;
-    }
-    
-    /**
-     * Get the response body as string for error details.
-     */
-    public String getResponseBody() {
-        return response != null ? response.getBodyAsString() : null;
-    }
-    
-    @Override
-    public String toString() {
-        return String.format("%s{statusCode=%d, message='%s'}", 
-            getClass().getSimpleName(), statusCode, getMessage());
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/com/chargebee/v4/transport/HttpStatusHandler.java b/src/main/java/com/chargebee/v4/transport/HttpStatusHandler.java
index 287ee165..b79c0120 100644
--- a/src/main/java/com/chargebee/v4/transport/HttpStatusHandler.java
+++ b/src/main/java/com/chargebee/v4/transport/HttpStatusHandler.java
@@ -1,186 +1,196 @@
+/*
+ * This file is auto-generated by Chargebee.
+ * Copyright 2025 Chargebee Inc.
+ */
+
 package com.chargebee.v4.transport;
 
 import com.chargebee.v4.exceptions.*;
+import com.chargebee.v4.exceptions.codes.*;
 import com.chargebee.v4.internal.JsonUtil;
 
 /**
- * Utility class for handling HTTP status codes and creating appropriate exceptions.
+ * Utility class for handling HTTP status codes and creating appropriate exceptions. This handler
+ * parses API error responses and throws strongly-typed exceptions based on the error type returned
+ * by the API.
  */
 public final class HttpStatusHandler {
 
-    private static final String UBB_BATCH_INGESTION_INVALID_REQUEST = "ubb_batch_ingestion_invalid_request";
+  private HttpStatusHandler() {
+    // Utility class
+  }
+
+  /**
+   * Validate HTTP response and throw appropriate exception if not successful.
+   *
+   * @param request the HTTP request that generated this response
+   * @param response the HTTP response to validate
+   * @throws HttpException if the response indicates an error (4xx or 5xx)
+   */
+  public static void validateResponse(Request request, Response response) throws HttpException {
+    int statusCode = response.getStatusCode();
 
-    private HttpStatusHandler() {
-        // Utility class
+    if (response.isSuccessful()) {
+      return;
     }
 
-    /**
-     * Validate HTTP response and throw appropriate exception if not successful.
-     *
-     * @param request the HTTP request that generated this response
-     * @param response the HTTP response to validate
-     * @throws HttpException if the response indicates an error (4xx or 5xx)
-     */
-    public static void validateResponse(Request request, Response response) throws HttpException {
-        int statusCode = response.getStatusCode();
-
-        if (response.isSuccessful()) {
-            return; // 2xx status codes are successful
-        }
+    String body = response.getBodyAsString();
+    if (body != null && !body.trim().isEmpty() && body.trim().startsWith("{")) {
+      boolean hasType = JsonUtil.hasValue(body, "type");
+      boolean hasMessage = JsonUtil.hasValue(body, "message");
+      boolean hasApiErrorCode = JsonUtil.hasValue(body, "api_error_code");
 
-        // Try to parse error response as JSON and throw appropriate API exception
-        // Only treat as API exception if it has the 'type' field or has both 'message' and 'api_error_code'
-        String body = response.getBodyAsString();
-        if (body != null && !body.trim().isEmpty() && body.trim().startsWith("{")) {
-            boolean hasType = JsonUtil.hasValue(body, "type");
-            boolean hasMessage = JsonUtil.hasValue(body, "message");
-            boolean hasApiErrorCode = JsonUtil.hasValue(body, "api_error_code");
-
-            // Treat as Chargebee API error if it has type field, or both message and api_error_code
-            if (hasType || (hasMessage && hasApiErrorCode)) {
-                throwAPIException(statusCode, body, request, response);
-                return;
-            }
-        }
+      if (hasType || (hasMessage && hasApiErrorCode)) {
+        throwAPIException(statusCode, body, request, response);
+        return;
+      }
+    }
 
-        // Fallback to generic HTTP exceptions if response is not valid JSON
-        String message = createErrorMessage(statusCode, response);
+    String message = createErrorMessage(statusCode, response);
 
-        if (statusCode >= 400 && statusCode < 500) {
-            throw new ClientErrorException(statusCode, message, response);
-        } else if (statusCode >= 500) {
-            throw new ServerErrorException(statusCode, message, response);
-        }
+    if (statusCode >= 400 && statusCode < 500) {
+      throw new ClientErrorException(statusCode, message, request, response);
+    } else if (statusCode >= 500) {
+      throw new ServerErrorException(statusCode, message, request, response);
+    }
+  }
 
-        // For other non-2xx codes (1xx, 3xx), we don't throw exceptions
-        // 1xx are informational, 3xx are redirects (should be handled by HTTP client)
+  /** Throw appropriate API exception based on error type in JSON response. */
+  private static void throwAPIException(
+      int statusCode, String jsonResponse, Request request, Response response) throws APIException {
+    String type = JsonUtil.getString(jsonResponse, "type");
+    String apiErrorCodeStr = JsonUtil.getString(jsonResponse, "api_error_code");
+    String message = JsonUtil.getString(jsonResponse, "message");
+    if (message == null) {
+      message = "API Error";
     }
 
-    /**
-     * Throw appropriate API exception based on error type in JSON response.
-     */
-    private static void throwAPIException(int statusCode, String jsonResponse, Request request, Response response)
-            throws APIException {
-        String type = JsonUtil.getString(jsonResponse, "type");
-        String apiErrorCode = JsonUtil.getString(jsonResponse, "api_error_code");
-        String message = JsonUtil.getString(jsonResponse, "message");
-        if (message == null) {
-            message = "API Error";
-        }
+    ErrorType errorType = ErrorType.fromString(type);
+    ApiErrorCode apiErrorCode = parseApiErrorCode(statusCode, apiErrorCodeStr);
 
-        // Check if this is a batch API error by examining the request URL
-        boolean isBatchApi = isBatchApiRequest(request);
-
-        // Throw specific exception based on error type
-        if (UBB_BATCH_INGESTION_INVALID_REQUEST.equals(type)) {
-            throw new UbbBatchIngestionInvalidRequestException(
-                statusCode, type, apiErrorCode, message, jsonResponse, response);
-        } else if (isBatchApi) {
-            throw new BatchAPIException(
-                statusCode, type, apiErrorCode, message, jsonResponse, response);
-        } else if ("payment".equals(type)) {
-            throw new PaymentException(
-                statusCode, type, apiErrorCode, message, jsonResponse, response);
-        } else if ("operation_failed".equals(type)) {
-            throw new OperationFailedException(
-                statusCode, type, apiErrorCode, message, jsonResponse, response);
-        } else if ("invalid_request".equals(type)) {
-            throw new InvalidRequestException(
-                statusCode, type, apiErrorCode, message, jsonResponse, response);
-        } else {
-            // Generic API exception for unknown types
-            throw new APIException(
-                statusCode, type, apiErrorCode, message, jsonResponse, response);
-        }
+    // Throw specific exception based on error type
+    switch (errorType) {
+      case INVALID_REQUEST:
+        throw new InvalidRequestException(
+            statusCode, type, apiErrorCode, message, jsonResponse, request, response);
+
+      case PAYMENT:
+        throw new PaymentException(
+            statusCode, type, apiErrorCode, message, jsonResponse, request, response);
+
+      case OPERATION_FAILED:
+        throw new OperationFailedException(
+            statusCode, type, apiErrorCode, message, jsonResponse, request, response);
+
+      default:
+        // Generic API exception for unknown or untyped errors
+        throw new APIException(
+            statusCode, type, apiErrorCode, message, jsonResponse, request, response);
     }
+  }
 
-    /**
-     * Check if the request is a batch API request by examining the URL.
-     *
-     * @param request the HTTP request
-     * @return true if the request URL contains "/batch/"
-     */
-    private static boolean isBatchApiRequest(Request request) {
-        if (request == null || request.getUrl() == null) {
-            return false;
-        }
-        return request.getUrl().contains("/batch/");
+  /** Parse the API error code string to the appropriate typed enum based on HTTP status code. */
+  private static ApiErrorCode parseApiErrorCode(int statusCode, String apiErrorCodeStr) {
+    if (apiErrorCodeStr == null) {
+      return null;
     }
-    
-    /**
-     * Create a descriptive error message based on status code and response.
-     */
-    private static String createErrorMessage(int statusCode, Response response) {
-        String statusMessage = getStatusMessage(statusCode);
-        String body = response.getBodyAsString();
-        
-        if (body != null && !body.trim().isEmpty()) {
-            // Try to extract error message from response body
-            String extractedMessage = extractErrorMessage(body);
-            if (extractedMessage != null && !extractedMessage.isEmpty()) {
-                return String.format("HTTP %d %s: %s", statusCode, statusMessage, extractedMessage);
-            }
-        }
-        
-        return String.format("HTTP %d %s", statusCode, statusMessage);
+    switch (statusCode) {
+      case 400:
+        return BadRequestApiErrorCode.fromString(apiErrorCodeStr);
+      case 401:
+        return UnauthorizedApiErrorCode.fromString(apiErrorCodeStr);
+      case 403:
+        return ForbiddenApiErrorCode.fromString(apiErrorCodeStr);
+      case 404:
+        return NotFoundApiErrorCode.fromString(apiErrorCodeStr);
+      case 405:
+        return MethodNotAllowedApiErrorCode.fromString(apiErrorCodeStr);
+      case 409:
+        return ConflictApiErrorCode.fromString(apiErrorCodeStr);
+      case 422:
+        return UnprocessableEntityApiErrorCode.fromString(apiErrorCodeStr);
+      case 429:
+        return TooManyRequestsApiErrorCode.fromString(apiErrorCodeStr);
+      case 500:
+        return InternalServerErrorApiErrorCode.fromString(apiErrorCodeStr);
+      case 503:
+        return ServiceUnavailableApiErrorCode.fromString(apiErrorCodeStr);
+      default:
+        return BadRequestApiErrorCode.fromString(apiErrorCodeStr);
     }
-    
-    /**
-     * Get standard HTTP status message for a status code.
-     */
-    private static String getStatusMessage(int statusCode) {
-        switch (statusCode) {
-            // 4xx Client Errors
-            case 400: return "Bad Request";
-            case 401: return "Unauthorized";
-            case 403: return "Forbidden";
-            case 404: return "Not Found";
-            case 405: return "Method Not Allowed";
-            case 409: return "Conflict";
-            case 422: return "Unprocessable Entity";
-            case 429: return "Too Many Requests";
-            
-            // 5xx Server Errors
-            case 500: return "Internal Server Error";
-            case 502: return "Bad Gateway";
-            case 503: return "Service Unavailable";
-            case 504: return "Gateway Timeout";
-            
-            // Generic messages
-            default:
-                if (statusCode >= 400 && statusCode < 500) {
-                    return "Client Error";
-                } else if (statusCode >= 500) {
-                    return "Server Error";
-                } else {
-                    return "HTTP Error";
-                }
-        }
+  }
+
+  /** Create a descriptive error message based on status code and response. */
+  private static String createErrorMessage(int statusCode, Response response) {
+    String statusMessage = getStatusMessage(statusCode);
+    String body = response.getBodyAsString();
+
+    if (body != null && !body.trim().isEmpty()) {
+      String extractedMessage = extractErrorMessage(body);
+      if (extractedMessage != null && !extractedMessage.isEmpty()) {
+        return String.format("HTTP %d %s: %s", statusCode, statusMessage, extractedMessage);
+      }
     }
-    
-    /**
-     * Try to extract error message from JSON response body.
-     * This is a simple implementation - could be enhanced for specific API error formats.
-     */
-    private static String extractErrorMessage(String body) {
-        if (body == null || body.trim().isEmpty()) {
-            return null;
-        }
-        
-        // Simple JSON parsing to extract common error message fields
-        // This could be enhanced with a proper JSON parser if needed
-        String[] possibleFields = {"message", "error", "error_description", "detail"};
-        
-        for (String field : possibleFields) {
-            String pattern = "\"" + field + "\"\\s*:\\s*\"([^\"]+)\"";
-            java.util.regex.Pattern regex = java.util.regex.Pattern.compile(pattern, java.util.regex.Pattern.CASE_INSENSITIVE);
-            java.util.regex.Matcher matcher = regex.matcher(body);
-            if (matcher.find()) {
-                return matcher.group(1);
-            }
+
+    return String.format("HTTP %d %s", statusCode, statusMessage);
+  }
+
+  /** Get standard HTTP status message for a status code. */
+  private static String getStatusMessage(int statusCode) {
+    switch (statusCode) {
+      case 400:
+        return "Bad Request";
+      case 401:
+        return "Unauthorized";
+      case 403:
+        return "Forbidden";
+      case 404:
+        return "Not Found";
+      case 405:
+        return "Method Not Allowed";
+      case 409:
+        return "Conflict";
+      case 422:
+        return "Unprocessable Entity";
+      case 429:
+        return "Too Many Requests";
+      case 500:
+        return "Internal Server Error";
+      case 502:
+        return "Bad Gateway";
+      case 503:
+        return "Service Unavailable";
+      case 504:
+        return "Gateway Timeout";
+      default:
+        if (statusCode >= 400 && statusCode < 500) {
+          return "Client Error";
+        } else if (statusCode >= 500) {
+          return "Server Error";
+        } else {
+          return "HTTP Error";
         }
-        
-        // If no specific error message found, return first 200 characters of body
-        return body.length() > 200 ? body.substring(0, 200) + "..." : body;
     }
-}
\ No newline at end of file
+  }
+
+  /** Try to extract error message from JSON response body. */
+  private static String extractErrorMessage(String body) {
+    if (body == null || body.trim().isEmpty()) {
+      return null;
+    }
+
+    String[] possibleFields = {"message", "error", "error_description", "detail"};
+
+    for (String field : possibleFields) {
+      String pattern = "\"" + field + "\"\\s*:\\s*\"([^\"]+)\"";
+      java.util.regex.Pattern regex =
+          java.util.regex.Pattern.compile(pattern, java.util.regex.Pattern.CASE_INSENSITIVE);
+      java.util.regex.Matcher matcher = regex.matcher(body);
+      if (matcher.find()) {
+        return matcher.group(1);
+      }
+    }
+
+    return body.length() > 200 ? body.substring(0, 200) + "..." : body;
+  }
+}
diff --git a/src/main/java/com/chargebee/v4/transport/NetworkException.java b/src/main/java/com/chargebee/v4/transport/NetworkException.java
deleted file mode 100644
index 939c3927..00000000
--- a/src/main/java/com/chargebee/v4/transport/NetworkException.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package com.chargebee.v4.transport;
-
-/**
- * Network connectivity issues, DNS failures.
- */
-public class NetworkException extends TransportException {
-    
-    public NetworkException(String message, Throwable cause) {
-        super(message, cause);
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/com/chargebee/v4/transport/Response.java b/src/main/java/com/chargebee/v4/transport/Response.java
index c1585245..a6cedb35 100644
--- a/src/main/java/com/chargebee/v4/transport/Response.java
+++ b/src/main/java/com/chargebee/v4/transport/Response.java
@@ -55,6 +55,27 @@ public boolean isSuccessful() {
         return statusCode >= 200 && statusCode < 300;
     }
     
+    /**
+     * Get a single header value by name (case-insensitive).
+     *
+     * @param name the header name
+     * @return the first header value, or null if not found
+     */
+    public String getHeader(String name) {
+        List<String> values = getHeaderValue(headers, name);
+        return (values != null && !values.isEmpty()) ? values.get(0) : null;
+    }
+    
+    /**
+     * Get all values for a header by name (case-insensitive).
+     *
+     * @param name the header name
+     * @return list of header values, or null if not found
+     */
+    public List<String> getHeaderValues(String name) {
+        return getHeaderValue(headers, name);
+    }
+    
     private static String parseContentType(Map<String, List<String>> headers) {
         List<String> values = getHeaderValue(headers, "Content-Type");
         if (values == null || values.isEmpty()) return null;
diff --git a/src/main/java/com/chargebee/v4/transport/ServerErrorException.java b/src/main/java/com/chargebee/v4/transport/ServerErrorException.java
deleted file mode 100644
index 12de791e..00000000
--- a/src/main/java/com/chargebee/v4/transport/ServerErrorException.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.chargebee.v4.transport;
-
-/**
- * Exception for 5xx HTTP status codes (server errors).
- * Indicates issues on the server side that may be temporary.
- */
-public class ServerErrorException extends HttpException {
-    
-    public ServerErrorException(int statusCode, String message, Response response) {
-        super(statusCode, message, response);
-    }
-    
-    public ServerErrorException(int statusCode, String message, Response response, Throwable cause) {
-        super(statusCode, message, response, cause);
-    }
-    
-    /**
-     * Check if this is a specific server error type.
-     */
-    public boolean isInternalServerError() {
-        return getStatusCode() == 500;
-    }
-    
-    public boolean isBadGateway() {
-        return getStatusCode() == 502;
-    }
-    
-    public boolean isServiceUnavailable() {
-        return getStatusCode() == 503;
-    }
-    
-    public boolean isGatewayTimeout() {
-        return getStatusCode() == 504;
-    }
-    
-    /**
-     * Check if this error might be retryable.
-     * Generally, 5xx errors except 501 (Not Implemented) are considered retryable.
-     */
-    public boolean isRetryable() {
-        int code = getStatusCode();
-        return code >= 500 && code != 501; // 501 Not Implemented is not retryable
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/com/chargebee/v4/transport/TimeoutException.java b/src/main/java/com/chargebee/v4/transport/TimeoutException.java
deleted file mode 100644
index 96788f5d..00000000
--- a/src/main/java/com/chargebee/v4/transport/TimeoutException.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.chargebee.v4.transport;
-
-/**
- * Connection or read timeouts.
- */
-public class TimeoutException extends TransportException {
-    private final String timeoutType; // "connect" or "read"
-    
-    public TimeoutException(String timeoutType, String message, Throwable cause) {
-        super(message, cause);
-        this.timeoutType = timeoutType;
-    }
-    
-    public String getTimeoutType() {
-        return timeoutType;
-    }
-    
-    public boolean isRetryable() {
-        return true; // Timeouts are generally retryable
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/com/chargebee/v4/transport/Transport.java b/src/main/java/com/chargebee/v4/transport/Transport.java
index e6cb92a7..1b6813ef 100644
--- a/src/main/java/com/chargebee/v4/transport/Transport.java
+++ b/src/main/java/com/chargebee/v4/transport/Transport.java
@@ -1,5 +1,8 @@
 package com.chargebee.v4.transport;
 
+import com.chargebee.v4.exceptions.HttpException;
+import com.chargebee.v4.exceptions.TransportException;
+
 import java.util.concurrent.CompletableFuture;
 
 /**
@@ -13,10 +16,8 @@ public interface Transport {
      * 
      * @param request the HTTP request to send
      * @return the HTTP response
-     * @throws TransportException for network, timeout, or configuration failures
-     * @throws HttpException for HTTP error status codes (4xx, 5xx)
      */
-    Response send(Request request) throws TransportException;
+    Response send(Request request);
     
     /**
      * Send an HTTP request asynchronously and return a CompletableFuture with the response.
diff --git a/src/main/java/com/chargebee/v4/transport/TransportException.java b/src/main/java/com/chargebee/v4/transport/TransportException.java
deleted file mode 100644
index 5b3c8790..00000000
--- a/src/main/java/com/chargebee/v4/transport/TransportException.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.chargebee.v4.transport;
-
-/**
- * Base exception for transport-layer failures.
- * Transport never interprets HTTP status codes - only throws for infrastructure issues.
- */
-public class TransportException extends Exception {
-    
-    public TransportException(String message) {
-        super(message);
-    }
-    
-    public TransportException(String message, Throwable cause) {
-        super(message, cause);
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/com/chargebee/v4/webhook/UnhandledEventCallback.java b/src/main/java/com/chargebee/v4/webhook/UnhandledEventCallback.java
new file mode 100644
index 00000000..ef593a43
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/webhook/UnhandledEventCallback.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.webhook;
+
+import com.chargebee.v4.models.event.Event;
+
+/**
+ * Functional interface for handling unregistered/unhandled Chargebee webhook events.
+ * 
+ * <p>This interface is invoked when no specific handler is registered for an event type.
+ * This allows you to log, store, or process unknown/unhandled events.</p>
+ * 
+ * <p>Example usage:</p>
+ * <pre>
+ * UnhandledEventCallback fallbackHandler = (event, eventType, rawPayload) -> {
+ *     log.warn("Unhandled event: type={}, id={}", eventType, event.getId());
+ *     return WebhookResult.unhandled(eventType, event.getId());
+ * };
+ * </pre>
+ */
+@FunctionalInterface
+public interface UnhandledEventCallback {
+
+    /**
+     * Handles an unhandled/unregistered webhook event and returns the processing result.
+     *
+     * @param event The base Event object (with content as Map)
+     * @param eventType The event type string that was not handled
+     * @param rawPayload The raw JSON payload (for custom parsing if needed)
+     * @return WebhookResult indicating the outcome of processing
+     * @throws Exception if event processing fails
+     */
+    WebhookResult handle(Event event, String eventType, String rawPayload) throws Exception;
+}
diff --git a/src/main/java/com/chargebee/v4/webhook/WebhookEventCallback.java b/src/main/java/com/chargebee/v4/webhook/WebhookEventCallback.java
new file mode 100644
index 00000000..5d99ad4c
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/webhook/WebhookEventCallback.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.webhook;
+
+/**
+ * Functional interface for handling Chargebee webhook events.
+ * 
+ * <p>Implement this interface to create handlers for specific event types.
+ * The callback receives the fully typed event object from the SDK.</p>
+ * 
+ * <p>Example usage:</p>
+ * <pre>
+ * handler.on(Event.EventType.CUSTOMER_CREATED, CustomerCreatedEvent.class, (typedEvent) -> {
+ *     Customer customer = typedEvent.getContent().getCustomer();
+ *     System.out.println("New customer: " + customer.getId());
+ *     return WebhookResult.success(typedEvent.getEventType(), typedEvent.getId());
+ * });
+ * </pre>
+ *
+ * @param <T> The typed event class (e.g., CustomerCreatedEvent, SubscriptionCreatedEvent)
+ */
+@FunctionalInterface
+public interface WebhookEventCallback<T> {
+
+    /**
+     * Handles a webhook event and returns the processing result.
+     *
+     * @param typedEvent The typed event object with strongly-typed content
+     * @return WebhookResult indicating the outcome of processing
+     * @throws Exception if event processing fails
+     */
+    WebhookResult handle(T typedEvent) throws Exception;
+}
diff --git a/src/main/java/com/chargebee/v4/webhook/WebhookEventHandler.java b/src/main/java/com/chargebee/v4/webhook/WebhookEventHandler.java
new file mode 100644
index 00000000..00517a2e
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/webhook/WebhookEventHandler.java
@@ -0,0 +1,340 @@
+/*
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.webhook;
+
+import com.chargebee.v4.models.event.Event;
+
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.stream.Collectors;
+
+/**
+ * Central handler for processing Chargebee webhook events.
+ * 
+ * <p>This class provides a fluent API for registering event callbacks and processing 
+ * incoming webhook notifications. It handles optional Basic Auth verification, event 
+ * parsing, and routing to appropriate handlers.</p>
+ * 
+ * <h2>Quick Start:</h2>
+ * <pre>
+ * // Create the handler
+ * WebhookEventHandler handler = WebhookEventHandler.create();
+ * 
+ * // Register callbacks for specific event types (class is auto-resolved via type witness)
+ * handler.&lt;CustomerCreatedEvent&gt;on(Event.EventType.CUSTOMER_CREATED, event -> {
+ *     Customer customer = event.getContent().getCustomer();
+ *     System.out.println("Customer created: " + customer.getEmail());
+ *     return WebhookResult.success(event.getEventType(), event.getId());
+ * });
+ * 
+ * handler.&lt;SubscriptionCancelledEvent&gt;on(Event.EventType.SUBSCRIPTION_CANCELLED, event -> {
+ *     Subscription sub = event.getContent().getSubscription();
+ *     System.out.println("Subscription cancelled: " + sub.getId());
+ *     return WebhookResult.success(event.getEventType(), event.getId());
+ * });
+ * 
+ * // Process incoming webhook (in your controller)
+ * WebhookResult result = handler.handleWebhook(requestBody);
+ * </pre>
+ * 
+ * <h2>With Basic Auth (Optional):</h2>
+ * <pre>
+ * WebhookEventHandler handler = WebhookEventHandler.builder()
+ *     .basicAuth("username", "password")
+ *     .fallbackCallback((event, eventType, rawPayload) -> {
+ *         System.out.println("Unhandled event: " + eventType);
+ *         return WebhookResult.unhandled(eventType, event.getId());
+ *     })
+ *     .build();
+ * 
+ * // Process with auth verification
+ * WebhookResult result = handler.handleWebhook(requestBody, authorizationHeader);
+ * </pre>
+ * 
+ * <h2>Common Event Types:</h2>
+ * <ul>
+ *   <li>customer_created, customer_changed, customer_deleted</li>
+ *   <li>subscription_created, subscription_activated, subscription_cancelled, subscription_renewed</li>
+ *   <li>invoice_generated, invoice_updated, invoice_deleted</li>
+ *   <li>payment_succeeded, payment_failed, payment_refunded</li>
+ *   <li>card_added, card_updated, card_expired</li>
+ * </ul>
+ * 
+ * @see WebhookEventCallback
+ * @see UnhandledEventCallback
+ * @see WebhookResult
+ */
+public class WebhookEventHandler {
+
+    private final String webhookUsername;
+    private final String webhookPassword;
+    private final WebhookVerifier webhookVerifier;
+    private final UnhandledEventCallback fallbackCallback;
+    private final Map<String, EventCallbackWrapper<?>> callbacks;
+
+    private WebhookEventHandler(Builder builder) {
+        this.webhookUsername = builder.webhookUsername;
+        this.webhookPassword = builder.webhookPassword;
+        this.webhookVerifier = builder.webhookVerifier;
+        this.fallbackCallback = builder.fallbackCallback;
+        this.callbacks = new ConcurrentHashMap<>();
+    }
+
+    /**
+     * Creates a simple WebhookEventHandler without authentication.
+     *
+     * @return A new WebhookEventHandler instance
+     */
+    public static WebhookEventHandler create() {
+        return builder().build();
+    }
+
+    /**
+     * Creates a new builder for WebhookEventHandler.
+     *
+     * @return A new Builder instance
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    private static final String EVENT_CLASS_PACKAGE = "com.chargebee.v4.models.event";
+
+    /**
+     * Registers a callback for a specific event type.
+     * The event class is automatically derived from the event type.
+     *
+     * <p>Usage with type witness:</p>
+     * <pre>
+     * handler.&lt;CustomerCreatedEvent&gt;on(Event.EventType.CUSTOMER_CREATED, event -> {
+     *     Customer customer = event.getContent().getCustomer();
+     *     return WebhookResult.success(event.getEventType(), event.getId());
+     * });
+     * </pre>
+     *
+     * @param eventType The event type enum value (e.g., Event.EventType.CUSTOMER_CREATED)
+     * @param callback The callback to invoke when this event type is received
+     * @param <T> The type of the event class
+     * @return This handler for method chaining
+     * @throws WebhookException if the event class cannot be found
+     */
+    @SuppressWarnings("unchecked")
+    public <T> WebhookEventHandler on(Event.EventType eventType, WebhookEventCallback<T> callback) {
+        String eventTypeValue = eventType.getValue();
+        if (eventTypeValue == null) {
+            throw new WebhookException("Event type value cannot be null");
+        }
+        Class<T> eventClass = (Class<T>) resolveEventClass(eventTypeValue);
+        callbacks.put(eventTypeValue, new EventCallbackWrapper<>(eventClass, callback));
+        return this;
+    }
+
+    /**
+     * Resolves the event class from the event type string.
+     * Converts snake_case event type to PascalCase class name.
+     * e.g., "customer_moved_in" -> CustomerMovedInEvent
+     *
+     * @param eventType The event type string (e.g., "customer_moved_in")
+     * @return The resolved event class
+     * @throws WebhookException if the class cannot be found
+     */
+    private Class<?> resolveEventClass(String eventType) {
+        String className = Arrays.stream(eventType.split("_"))
+                .map(word -> word.substring(0, 1).toUpperCase() + word.substring(1).toLowerCase())
+                .collect(Collectors.joining()) + "Event";
+        
+        String fullClassName = EVENT_CLASS_PACKAGE + "." + className;
+        
+        try {
+            return Class.forName(fullClassName);
+        } catch (ClassNotFoundException e) {
+            throw new WebhookException("Event class not found: " + fullClassName + 
+                    ". Ensure the event type '" + eventType + "' is supported.", e);
+        }
+    }
+
+    /**
+     * Processes an incoming webhook request without authentication.
+     *
+     * @param payload The raw request body (JSON)
+     * @return WebhookResult from the callback
+     * @throws WebhookException if processing fails
+     */
+    public WebhookResult handleWebhook(String payload) {
+        return handleWebhook(payload, null);
+    }
+
+    /**
+     * Processes an incoming webhook request with optional authentication.
+     * 
+     * <p>This method:</p>
+     * <ol>
+     *   <li>Verifies Basic Auth credentials (if configured)</li>
+     *   <li>Parses the payload to determine event type</li>
+     *   <li>Parses the payload to the typed event class</li>
+     *   <li>Routes to the appropriate registered callback or fallback</li>
+     *   <li>Returns the WebhookResult from the callback</li>
+     * </ol>
+     *
+     * @param payload The raw request body (JSON)
+     * @param authorizationHeader The Authorization header value (can be null)
+     * @return WebhookResult from the callback
+     * @throws WebhookException if processing fails
+     */
+    public WebhookResult handleWebhook(String payload, String authorizationHeader) {
+        // Verify Basic Auth if configured
+        if (webhookUsername != null && !webhookUsername.isEmpty() && 
+            webhookPassword != null && !webhookPassword.isEmpty()) {
+            
+            if (webhookVerifier == null) {
+                throw new WebhookException("Basic Auth is configured but verifier is not set");
+            }
+            
+            if (!webhookVerifier.verifyBasicAuth(authorizationHeader, webhookUsername, webhookPassword)) {
+                return WebhookResult.failure("Invalid webhook credentials");
+            }
+        }
+
+        // Parse the event to get event type
+        Event event;
+        try {
+            event = Event.fromJson(payload);
+        } catch (Exception e) {
+            throw new WebhookException("Failed to parse webhook payload", e);
+        }
+
+        if (event.getEventType() == null) {
+            return WebhookResult.failure("Event type is missing");
+        }
+
+        String eventType = event.getEventType().getValue();
+        
+        if (eventType == null) {
+            return WebhookResult.failure("Event type value is null");
+        }
+
+        // Route to appropriate callback
+        EventCallbackWrapper<?> wrapper = callbacks.get(eventType);
+        
+        try {
+            if (wrapper != null) {
+                return invokeCallback(wrapper, payload);
+            } else if (fallbackCallback != null) {
+                return fallbackCallback.handle(event, eventType, payload);
+            } else {
+                return WebhookResult.unhandled(eventType, event.getId());
+            }
+        } catch (Exception e) {
+            throw new WebhookException("Failed to process webhook event: " + eventType, e);
+        }
+    }
+
+    /**
+     * Checks if a callback is registered for the given event type.
+     *
+     * @param eventType The event type to check
+     * @return true if a callback is registered
+     */
+    public boolean hasCallback(String eventType) {
+        return callbacks.containsKey(eventType);
+    }
+
+    /**
+     * Returns the number of registered callbacks.
+     *
+     * @return The number of registered callbacks
+     */
+    public int getRegisteredCallbackCount() {
+        return callbacks.size();
+    }
+
+    @SuppressWarnings("unchecked")
+    private <T> WebhookResult invokeCallback(EventCallbackWrapper<T> wrapper, String payload) throws Exception {
+        // Parse to typed event using the event class's fromJson method
+        Method fromJsonMethod = wrapper.eventClass.getMethod("fromJson", String.class);
+        T typedEvent = (T) fromJsonMethod.invoke(null, payload);
+        return wrapper.callback.handle(typedEvent);
+    }
+
+    private static class EventCallbackWrapper<T> {
+        final Class<T> eventClass;
+        final WebhookEventCallback<T> callback;
+
+        EventCallbackWrapper(Class<T> eventClass, WebhookEventCallback<T> callback) {
+            this.eventClass = eventClass;
+            this.callback = callback;
+        }
+    }
+
+    /**
+     * Builder for WebhookEventHandler.
+     */
+    public static class Builder {
+        private String webhookUsername;
+        private String webhookPassword;
+        private WebhookVerifier webhookVerifier;
+        private UnhandledEventCallback fallbackCallback;
+
+        /**
+         * Configures Basic Auth credentials for webhook verification (optional).
+         *
+         * @param username The username configured in Chargebee webhook settings
+         * @param password The password configured in Chargebee webhook settings
+         * @return This builder
+         */
+        public Builder basicAuth(String username, String password) {
+            this.webhookUsername = username;
+            this.webhookPassword = password;
+            this.webhookVerifier = new WebhookVerifier();
+            return this;
+        }
+
+        /**
+         * Sets a custom webhook verifier instance.
+         *
+         * @param webhookVerifier The WebhookVerifier to use
+         * @return This builder
+         */
+        public Builder webhookVerifier(WebhookVerifier webhookVerifier) {
+            this.webhookVerifier = webhookVerifier;
+            return this;
+        }
+
+        /**
+         * Sets the fallback callback for unhandled events.
+         *
+         * @param fallbackCallback The callback for unregistered event types
+         * @return This builder
+         */
+        public Builder fallbackCallback(UnhandledEventCallback fallbackCallback) {
+            this.fallbackCallback = fallbackCallback;
+            return this;
+        }
+
+        /**
+         * Builds the WebhookEventHandler.
+         *
+         * @return The configured WebhookEventHandler
+         */
+        public WebhookEventHandler build() {
+            return new WebhookEventHandler(this);
+        }
+    }
+
+    /**
+     * Exception thrown when webhook processing fails.
+     */
+    public static class WebhookException extends RuntimeException {
+        public WebhookException(String message) {
+            super(message);
+        }
+
+        public WebhookException(String message, Throwable cause) {
+            super(message, cause);
+        }
+    }
+}
diff --git a/src/main/java/com/chargebee/v4/webhook/WebhookResult.java b/src/main/java/com/chargebee/v4/webhook/WebhookResult.java
new file mode 100644
index 00000000..1dd6fa92
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/webhook/WebhookResult.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.webhook;
+
+/**
+ * Result of webhook processing.
+ * 
+ * <p>This class represents the outcome of processing a Chargebee webhook event.
+ * Use the static factory methods to create appropriate results:</p>
+ * <ul>
+ *   <li>{@link #success(String, String)} - Event processed successfully</li>
+ *   <li>{@link #unhandled(String, String)} - Event received but no handler registered</li>
+ *   <li>{@link #failure(String)} - Event processing failed</li>
+ * </ul>
+ */
+public class WebhookResult {
+    
+    private final boolean success;
+    private final boolean handled;
+    private final String eventType;
+    private final String eventId;
+    private final String errorMessage;
+
+    private WebhookResult(boolean success, boolean handled, String eventType, String eventId, String errorMessage) {
+        this.success = success;
+        this.handled = handled;
+        this.eventType = eventType;
+        this.eventId = eventId;
+        this.errorMessage = errorMessage;
+    }
+
+    /**
+     * Creates a success result indicating the event was processed successfully.
+     *
+     * @param eventType The event type that was processed
+     * @param eventId The event ID
+     * @return A success WebhookResult
+     */
+    public static WebhookResult success(String eventType, String eventId) {
+        return new WebhookResult(true, true, eventType, eventId, null);
+    }
+
+    /**
+     * Creates an unhandled result indicating the event was received but no handler was registered.
+     *
+     * @param eventType The event type
+     * @param eventId The event ID
+     * @return An unhandled WebhookResult
+     */
+    public static WebhookResult unhandled(String eventType, String eventId) {
+        return new WebhookResult(true, false, eventType, eventId, null);
+    }
+
+    /**
+     * Creates a failure result indicating the event processing failed.
+     *
+     * @param errorMessage Description of the failure
+     * @return A failure WebhookResult
+     */
+    public static WebhookResult failure(String errorMessage) {
+        return new WebhookResult(false, false, null, null, errorMessage);
+    }
+
+    /**
+     * @return true if the webhook was processed without errors
+     */
+    public boolean isSuccess() { 
+        return success; 
+    }
+    
+    /**
+     * @return true if a handler was found and executed for this event
+     */
+    public boolean isHandled() { 
+        return handled; 
+    }
+    
+    /**
+     * @return The event type that was processed, or null on failure
+     */
+    public String getEventType() { 
+        return eventType; 
+    }
+    
+    /**
+     * @return The event ID, or null on failure
+     */
+    public String getEventId() { 
+        return eventId; 
+    }
+    
+    /**
+     * @return Error message if processing failed, null otherwise
+     */
+    public String getErrorMessage() { 
+        return errorMessage; 
+    }
+
+    @Override
+    public String toString() {
+        return "WebhookResult{" +
+                "success=" + success +
+                ", handled=" + handled +
+                ", eventType='" + eventType + '\'' +
+                ", eventId='" + eventId + '\'' +
+                ", errorMessage='" + errorMessage + '\'' +
+                '}';
+    }
+}
+
diff --git a/src/main/java/com/chargebee/v4/webhook/WebhookVerifier.java b/src/main/java/com/chargebee/v4/webhook/WebhookVerifier.java
new file mode 100644
index 00000000..092ba7e8
--- /dev/null
+++ b/src/main/java/com/chargebee/v4/webhook/WebhookVerifier.java
@@ -0,0 +1,141 @@
+/*
+ * Copyright 2025 Chargebee Inc.
+ */
+
+package com.chargebee.v4.webhook;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+
+/**
+ * Utility class for verifying Chargebee webhook requests using HTTP Basic Authentication.
+ * 
+ * <p>Chargebee supports optional HTTP Basic Authentication for webhooks. When configured,
+ * Chargebee sends the username and password in the Authorization header as Base64-encoded
+ * credentials.</p>
+ * 
+ * <p>To enable webhook authentication in Chargebee:</p>
+ * <ol>
+ *   <li>Go to Settings → Configure Chargebee → Webhooks</li>
+ *   <li>Edit your webhook endpoint</li>
+ *   <li>Enable "Basic Authentication" and set username/password</li>
+ * </ol>
+ * 
+ * <p>Usage example:</p>
+ * <pre>
+ * WebhookVerifier verifier = new WebhookVerifier();
+ * boolean isValid = verifier.verifyBasicAuth(
+ *     authorizationHeader,
+ *     expectedUsername,
+ *     expectedPassword
+ * );
+ * </pre>
+ * 
+ * @see <a href="https://apidocs.chargebee.com/docs/api/events">Chargebee Events API</a>
+ */
+public class WebhookVerifier {
+
+    private static final String BASIC_AUTH_PREFIX = "Basic ";
+
+    /**
+     * Verifies the webhook request using HTTP Basic Authentication.
+     * 
+     * <p>Chargebee sends credentials in the Authorization header as:
+     * "Basic base64(username:password)"</p>
+     *
+     * @param authorizationHeader The Authorization header value from the request
+     * @param expectedUsername The expected username configured in Chargebee
+     * @param expectedPassword The expected password configured in Chargebee
+     * @return true if credentials match, false otherwise
+     */
+    public boolean verifyBasicAuth(String authorizationHeader, String expectedUsername, String expectedPassword) {
+        if (authorizationHeader == null || !authorizationHeader.startsWith(BASIC_AUTH_PREFIX)) {
+            return false;
+        }
+
+        if (expectedUsername == null || expectedPassword == null) {
+            return false;
+        }
+
+        try {
+            // Extract Base64 encoded credentials
+            String base64Credentials = authorizationHeader.substring(BASIC_AUTH_PREFIX.length()).trim();
+            
+            // Decode credentials
+            byte[] decodedBytes = Base64.getDecoder().decode(base64Credentials);
+            String decodedCredentials = new String(decodedBytes, StandardCharsets.UTF_8);
+            
+            // Split into username:password
+            int colonIndex = decodedCredentials.indexOf(':');
+            if (colonIndex == -1) {
+                return false;
+            }
+            
+            String receivedUsername = decodedCredentials.substring(0, colonIndex);
+            String receivedPassword = decodedCredentials.substring(colonIndex + 1);
+            
+            // Use constant-time comparison to prevent timing attacks
+            boolean usernameMatch = secureCompare(receivedUsername, expectedUsername);
+            boolean passwordMatch = secureCompare(receivedPassword, expectedPassword);
+            
+            return usernameMatch && passwordMatch;
+            
+        } catch (IllegalArgumentException e) {
+            return false;
+        }
+    }
+
+    /**
+     * Extracts username from the Authorization header.
+     *
+     * @param authorizationHeader The Authorization header value
+     * @return The username, or null if extraction fails
+     */
+    public String extractUsername(String authorizationHeader) {
+        if (authorizationHeader == null || !authorizationHeader.startsWith(BASIC_AUTH_PREFIX)) {
+            return null;
+        }
+
+        try {
+            String base64Credentials = authorizationHeader.substring(BASIC_AUTH_PREFIX.length()).trim();
+            byte[] decodedBytes = Base64.getDecoder().decode(base64Credentials);
+            String decodedCredentials = new String(decodedBytes, StandardCharsets.UTF_8);
+            
+            int colonIndex = decodedCredentials.indexOf(':');
+            if (colonIndex == -1) {
+                return null;
+            }
+            
+            return decodedCredentials.substring(0, colonIndex);
+        } catch (IllegalArgumentException e) {
+            return null;
+        }
+    }
+
+    /**
+     * Performs a constant-time comparison of two strings to prevent timing attacks.
+     *
+     * @param a First string
+     * @param b Second string
+     * @return true if strings are equal, false otherwise
+     */
+    private boolean secureCompare(String a, String b) {
+        if (a == null || b == null) {
+            return false;
+        }
+        
+        byte[] aBytes = a.getBytes(StandardCharsets.UTF_8);
+        byte[] bBytes = b.getBytes(StandardCharsets.UTF_8);
+        
+        if (aBytes.length != bBytes.length) {
+            return false;
+        }
+        
+        int result = 0;
+        for (int i = 0; i < aBytes.length; i++) {
+            result |= aBytes[i] ^ bBytes[i];
+        }
+        return result == 0;
+    }
+}
+
diff --git a/src/test/java/com/chargebee/ChargebeeClientTest.java b/src/test/java/com/chargebee/ChargebeeClientTest.java
index e8ea6f37..2e7ddc47 100644
--- a/src/test/java/com/chargebee/ChargebeeClientTest.java
+++ b/src/test/java/com/chargebee/ChargebeeClientTest.java
@@ -1,6 +1,7 @@
 package com.chargebee;
 
 import com.chargebee.v4.client.ChargebeeClient;
+import com.chargebee.v4.exceptions.ConfigurationException;
 import com.chargebee.v4.internal.RetryConfig;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.DisplayName;
@@ -24,7 +25,7 @@ void testBuilderWithRequiredFields() {
     @Test
     @DisplayName("Builder should fail when apiKey is missing")
     void testBuilderFailsWithoutApiKey() {
-        com.chargebee.v4.transport.ConfigurationException exception = assertThrows(com.chargebee.v4.transport.ConfigurationException.class, () ->
+        ConfigurationException exception = assertThrows(ConfigurationException.class, () ->
                 ChargebeeClient.builder()
                         .siteName("acme")
                         .build()
@@ -35,7 +36,7 @@ void testBuilderFailsWithoutApiKey() {
     @Test
     @DisplayName("Builder should fail when siteName is missing")
     void testBuilderFailsWithoutSiteName() {
-        com.chargebee.v4.transport.ConfigurationException exception = assertThrows(com.chargebee.v4.transport.ConfigurationException.class, () ->
+        ConfigurationException exception = assertThrows(ConfigurationException.class, () ->
                 ChargebeeClient.builder()
                         .apiKey("cb_test_123")
                         .build()
@@ -46,7 +47,7 @@ void testBuilderFailsWithoutSiteName() {
     @Test
     @DisplayName("Builder should fail when both required fields are missing")
     void testBuilderFailsWithoutRequiredFields() {
-        com.chargebee.v4.transport.ConfigurationException exception = assertThrows(com.chargebee.v4.transport.ConfigurationException.class, () ->
+        ConfigurationException exception = assertThrows(ConfigurationException.class, () ->
                 ChargebeeClient.builder().build()
         );
         assertEquals("API key is required", exception.getMessage());
diff --git a/src/test/java/com/chargebee/transport/FakeTransport.java b/src/test/java/com/chargebee/transport/FakeTransport.java
index 580da4cc..382f7407 100644
--- a/src/test/java/com/chargebee/transport/FakeTransport.java
+++ b/src/test/java/com/chargebee/transport/FakeTransport.java
@@ -1,5 +1,7 @@
 package com.chargebee.v4.transport;
 
+import com.chargebee.v4.exceptions.TransportException;
+
 import java.util.*;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ConcurrentLinkedQueue;
@@ -21,7 +23,7 @@ public FakeTransport() {
     }
     
     @Override
-    public Response send(Request request) throws TransportException {
+    public Response send(Request request) {
         recordedRequests.add(request);
         
         Response response = queuedResponses.poll();
diff --git a/src/test/java/com/chargebee/v4/RequestParamsTest.java b/src/test/java/com/chargebee/v4/RequestParamsTest.java
new file mode 100644
index 00000000..687725cb
--- /dev/null
+++ b/src/test/java/com/chargebee/v4/RequestParamsTest.java
@@ -0,0 +1,199 @@
+package com.chargebee.v4;
+
+import com.chargebee.v4.models.estimate.params.CreateSubscriptionItemEstimateParams;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.DisplayName;
+import java.util.Map;
+import java.util.List;
+import java.util.Arrays;
+import java.sql.Timestamp;
+import java.time.Instant;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * Test class for strongly-typed request parameter POJOs.
+ * Demonstrates MapStruct compatibility and proper Java Bean behavior.
+ */
+class RequestParamsTest {
+
+    @Test
+    @DisplayName("CreateSubscriptionItemEstimateParams should build with strongly-typed fields")
+    void testCreateSubscriptionItemEstimateParamsBuilding() {
+        // Build request using the strongly-typed builder
+        CreateSubscriptionItemEstimateParams params = CreateSubscriptionItemEstimateParams.builder()
+                .billingCycles(3)
+                .mandatoryItemsToRemove(Arrays.asList("item1", "item2"))
+                .termsToCharge(12)
+                .billingAlignmentMode(CreateSubscriptionItemEstimateParams.BillingAlignmentMode.IMMEDIATE)
+                .couponIds(Arrays.asList("coupon1", "coupon2"))
+                .invoiceImmediately(true)
+                .invoiceDate(Timestamp.from(Instant.now()))
+                .clientProfileId("profile123")
+                .build();
+
+        // Test Java Bean getters (MapStruct compatible)
+        assertEquals(3, params.getBillingCycles());
+        assertEquals(Arrays.asList("item1", "item2"), params.getMandatoryItemsToRemove());
+        assertEquals(12, params.getTermsToCharge());
+        assertEquals(CreateSubscriptionItemEstimateParams.BillingAlignmentMode.IMMEDIATE, params.getBillingAlignmentMode());
+        assertEquals(Arrays.asList("coupon1", "coupon2"), params.getCouponIds());
+        assertTrue(params.getInvoiceImmediately());
+        assertNotNull(params.getInvoiceDate());
+        assertEquals("profile123", params.getClientProfileId());
+    }
+
+    @Test
+    @DisplayName("CreateSubscriptionItemEstimateParams should serialize to Map for HTTP transport")
+    void testCreateSubscriptionItemEstimateParamsToFormData() {
+        // Build request
+        CreateSubscriptionItemEstimateParams params = CreateSubscriptionItemEstimateParams.builder()
+                .billingCycles(6)
+                .mandatoryItemsToRemove(Arrays.asList("remove1"))
+                .termsToCharge(24)
+                .invoiceImmediately(false)
+                .build();
+
+        // Convert to form data (maintains backward compatibility)
+        Map<String, Object> formData = params.toFormData();
+
+        // Verify the Map contains the expected data
+        assertEquals(6, formData.get("billing_cycles"));
+        assertEquals(Arrays.asList("remove1"), formData.get("mandatory_items_to_remove"));
+        assertEquals(24, formData.get("terms_to_charge"));
+        assertFalse((Boolean) formData.get("invoice_immediately"));
+    }
+
+    @Test
+    @DisplayName("Nested SubscriptionParams should work correctly")
+    void testNestedSubscriptionParams() {
+        // Build nested subscription params
+        CreateSubscriptionItemEstimateParams.SubscriptionParams subscription =
+            CreateSubscriptionItemEstimateParams.SubscriptionParams.builder()
+                .id("sub123")
+                .trialEnd(Timestamp.from(Instant.now().plusSeconds(86400)))
+                .build();
+
+        // Build main params with nested subscription
+        CreateSubscriptionItemEstimateParams params = CreateSubscriptionItemEstimateParams.builder()
+                .subscription(subscription)
+                .billingCycles(12)
+                .build();
+
+        // Test nested getters
+        assertEquals("sub123", params.getSubscription().getId());
+        assertNotNull(params.getSubscription().getTrialEnd());
+        assertEquals(12, params.getBillingCycles());
+    }
+
+    @Test
+    @DisplayName("BillingAddressParams should work as nested object")
+    void testNestedBillingAddressParams() {
+        // Build nested billing address
+        CreateSubscriptionItemEstimateParams.BillingAddressParams billingAddress =
+            CreateSubscriptionItemEstimateParams.BillingAddressParams.builder()
+                .line1("123 Main St")
+                .city("San Francisco")
+                .stateCode("CA")
+                .zip("94105")
+                .country("US")
+                .build();
+
+        // Build main params
+        CreateSubscriptionItemEstimateParams params = CreateSubscriptionItemEstimateParams.builder()
+                .billingAddress(billingAddress)
+                .build();
+
+        // Test nested getters
+        assertEquals("123 Main St", params.getBillingAddress().getLine1());
+        assertEquals("San Francisco", params.getBillingAddress().getCity());
+        assertEquals("CA", params.getBillingAddress().getStateCode());
+        assertEquals("94105", params.getBillingAddress().getZip());
+        assertEquals("US", params.getBillingAddress().getCountry());
+    }
+
+    @Test
+    @DisplayName("Null values should be handled correctly")
+    void testNullValues() {
+        CreateSubscriptionItemEstimateParams params = CreateSubscriptionItemEstimateParams.builder()
+                .billingCycles(1)
+                .build();
+
+        // Test that only set values appear in form data
+        Map<String, Object> formData = params.toFormData();
+        assertEquals(1, formData.get("billing_cycles"));
+        assertFalse(formData.containsKey("terms_to_charge")); // null values not included
+    }
+
+    @Test
+    @DisplayName("List of SubscriptionItemsParams should work correctly")
+    void testListOfSubscriptionItemsParams() {
+        // Build list of subscription items
+        List<CreateSubscriptionItemEstimateParams.SubscriptionItemsParams> items = Arrays.asList(
+            CreateSubscriptionItemEstimateParams.SubscriptionItemsParams.builder()
+                .itemPriceId("price1")
+                .quantity(5)
+                .build(),
+            CreateSubscriptionItemEstimateParams.SubscriptionItemsParams.builder()
+                .itemPriceId("price2")
+                .quantity(10)
+                .build()
+        );
+
+        // Build main params
+        CreateSubscriptionItemEstimateParams params = CreateSubscriptionItemEstimateParams.builder()
+                .subscriptionItems(items)
+                .build();
+
+        // Test list getters
+        assertEquals(2, params.getSubscriptionItems().size());
+        assertEquals("price1", params.getSubscriptionItems().get(0).getItemPriceId());
+        assertEquals(5, params.getSubscriptionItems().get(0).getQuantity());
+        assertEquals("price2", params.getSubscriptionItems().get(1).getItemPriceId());
+        assertEquals(10, params.getSubscriptionItems().get(1).getQuantity());
+    }
+
+    @Test
+    @DisplayName("Enum values should work correctly")
+    void testEnumValues() {
+        CreateSubscriptionItemEstimateParams params = CreateSubscriptionItemEstimateParams.builder()
+                .billingAlignmentMode(CreateSubscriptionItemEstimateParams.BillingAlignmentMode.DELAYED)
+                .build();
+
+        assertEquals(CreateSubscriptionItemEstimateParams.BillingAlignmentMode.DELAYED,
+                    params.getBillingAlignmentMode());
+        assertEquals("delayed", params.getBillingAlignmentMode().getValue());
+
+        // Test enum fromString
+        CreateSubscriptionItemEstimateParams.BillingAlignmentMode parsed =
+            CreateSubscriptionItemEstimateParams.BillingAlignmentMode.fromString("immediate");
+        assertEquals(CreateSubscriptionItemEstimateParams.BillingAlignmentMode.IMMEDIATE, parsed);
+    }
+
+    @Test
+    @DisplayName("MapStruct compatibility - getters follow Java Bean convention")
+    void testMapStructCompatibility() {
+        CreateSubscriptionItemEstimateParams params = CreateSubscriptionItemEstimateParams.builder()
+                .billingCycles(42)
+                .clientProfileId("test-profile")
+                .build();
+
+        // These are the methods MapStruct would use for mapping
+        assertEquals(42, params.getBillingCycles());
+        assertEquals("test-profile", params.getClientProfileId());
+
+        // Verify the class follows Java Bean conventions
+        assertTrue(params.getClass().getDeclaredMethods().length > 0);
+
+        // Check that getters exist and are public
+        try {
+            java.lang.reflect.Method getBillingCycles = params.getClass().getMethod("getBillingCycles");
+            assertTrue(java.lang.reflect.Modifier.isPublic(getBillingCycles.getModifiers()));
+
+            java.lang.reflect.Method getClientProfileId = params.getClass().getMethod("getClientProfileId");
+            assertTrue(java.lang.reflect.Modifier.isPublic(getClientProfileId.getModifiers()));
+        } catch (NoSuchMethodException e) {
+            fail("Required getter methods not found", e);
+        }
+    }
+}
diff --git a/src/test/java/com/chargebee/v4/client/ChargebeeClientRetryTest.java b/src/test/java/com/chargebee/v4/client/ChargebeeClientRetryTest.java
index b2c81c42..c7212676 100644
--- a/src/test/java/com/chargebee/v4/client/ChargebeeClientRetryTest.java
+++ b/src/test/java/com/chargebee/v4/client/ChargebeeClientRetryTest.java
@@ -1,9 +1,12 @@
 package com.chargebee.v4.client;
 
+import com.chargebee.v4.exceptions.ClientErrorException;
+import com.chargebee.v4.exceptions.ConfigurationException;
+import com.chargebee.v4.exceptions.NetworkException;
+import com.chargebee.v4.exceptions.TimeoutException;
 import com.chargebee.v4.internal.RetryConfig;
 import com.chargebee.v4.transport.*;
 import org.junit.jupiter.api.*;
-import org.mockito.*;
 
 import java.util.*;
 import java.util.concurrent.CompletableFuture;
@@ -473,7 +476,8 @@ void shouldNotRetryOnConfigurationException() throws Exception {
         void shouldNotRetryOnClientErrorException() throws Exception {
             Transport mockTransport = mock(Transport.class);
             Response errorResponse = createResponse(400);
-            ClientErrorException clientError = new ClientErrorException(400, "Bad Request", errorResponse);
+            Request errorRequest = Request.builder().method("GET").url("http://test.com").build();
+            ClientErrorException clientError = new ClientErrorException(400, "Bad Request", errorRequest, errorResponse);
             
             when(mockTransport.send(any(Request.class))).thenThrow(clientError);
             
diff --git a/src/test/java/com/chargebee/v4/client/CustomTransportHeaderTest.java b/src/test/java/com/chargebee/v4/client/CustomTransportHeaderTest.java
index 01395792..8c387414 100644
--- a/src/test/java/com/chargebee/v4/client/CustomTransportHeaderTest.java
+++ b/src/test/java/com/chargebee/v4/client/CustomTransportHeaderTest.java
@@ -1,5 +1,6 @@
 package com.chargebee.v4.client;
 
+import com.chargebee.v4.exceptions.TransportException;
 import com.chargebee.v4.transport.*;
 import org.junit.jupiter.api.Test;
 import java.util.concurrent.CompletableFuture;
@@ -14,7 +15,7 @@ void customTransportShouldReceiveDefaultHeaders() throws Exception {
         
         Transport customTransport = new Transport() {
             @Override
-            public Response send(Request request) throws TransportException {
+            public Response send(Request request) {
                 capturedRequest.set(request);
                 return new Response(200, java.util.Collections.emptyMap(), "{}".getBytes());
             }
diff --git a/src/test/java/com/chargebee/v4/exceptions/APIExceptionTest.java b/src/test/java/com/chargebee/v4/exceptions/APIExceptionTest.java
index d7a23839..184eb0d1 100644
--- a/src/test/java/com/chargebee/v4/exceptions/APIExceptionTest.java
+++ b/src/test/java/com/chargebee/v4/exceptions/APIExceptionTest.java
@@ -1,5 +1,8 @@
 package com.chargebee.v4.exceptions;
 
+import com.chargebee.v4.exceptions.codes.ApiErrorCode;
+import com.chargebee.v4.exceptions.codes.BadRequestApiErrorCode;
+import com.chargebee.v4.transport.Request;
 import com.chargebee.v4.transport.Response;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
@@ -16,31 +19,36 @@ class APIExceptionTest {
     @Test
     @DisplayName("Should create APIException with all fields")
     void shouldCreateAPIExceptionWithAllFields() {
-        String jsonResponse = "{\"type\":\"invalid_request\",\"api_error_code\":\"missing_field\",\"message\":\"Required field is missing\",\"param\":\"email\"}";
+        String jsonResponse = "{\"type\":\"invalid_request\",\"api_error_code\":\"param_wrong_value\",\"message\":\"Required field is missing\",\"param\":\"email\"}";
+        Request mockRequest = createMockRequest();
         Response mockResponse = createMockResponse(400, jsonResponse);
 
         APIException exception = new APIException(
-            400, "invalid_request", "missing_field", "Required field is missing", jsonResponse, mockResponse
+            400, "invalid_request", BadRequestApiErrorCode.PARAM_WRONG_VALUE, "Required field is missing", jsonResponse, mockRequest, mockResponse
         );
 
         assertEquals(400, exception.getStatusCode());
         assertEquals("invalid_request", exception.getType());
-        assertEquals("missing_field", exception.getApiErrorCode());
+        assertEquals(BadRequestApiErrorCode.PARAM_WRONG_VALUE, exception.getApiErrorCode());
+        assertEquals("param_wrong_value", exception.getApiErrorCodeRaw());
         assertEquals("Required field is missing", exception.getMessage());
         assertEquals(jsonResponse, exception.getJsonResponse());
         assertNotNull(exception.getParams());
         assertEquals(1, exception.getParams().size());
         assertEquals("email", exception.getParams().get(0));
+        assertNotNull(exception.getRequest());
+        assertEquals("https://test-site.chargebee.com/api/v2/customers", exception.getRequest().getUrl());
     }
 
     @Test
     @DisplayName("Should extract single param from error response")
     void shouldExtractSingleParamFromErrorResponse() {
         String jsonResponse = "{\"type\":\"invalid_request\",\"message\":\"Invalid parameter\",\"param\":\"customer_id\"}";
+        Request mockRequest = createMockRequest();
         Response mockResponse = createMockResponse(400, jsonResponse);
 
         APIException exception = new APIException(
-            400, "invalid_request", null, "Invalid parameter", jsonResponse, mockResponse
+            400, "invalid_request", null, "Invalid parameter", jsonResponse, mockRequest, mockResponse
         );
 
         List<String> params = exception.getParams();
@@ -52,10 +60,11 @@ void shouldExtractSingleParamFromErrorResponse() {
     @DisplayName("Should extract multiple params from error response array")
     void shouldExtractMultipleParamsFromArray() {
         String jsonResponse = "{\"type\":\"invalid_request\",\"message\":\"Invalid parameters\",\"param\":[\"email\",\"phone\"]}";
+        Request mockRequest = createMockRequest();
         Response mockResponse = createMockResponse(400, jsonResponse);
 
         APIException exception = new APIException(
-            400, "invalid_request", null, "Invalid parameters", jsonResponse, mockResponse
+            400, "invalid_request", null, "Invalid parameters", jsonResponse, mockRequest, mockResponse
         );
 
         List<String> params = exception.getParams();
@@ -68,10 +77,11 @@ void shouldExtractMultipleParamsFromArray() {
     @DisplayName("Should handle missing params gracefully")
     void shouldHandleMissingParamsGracefully() {
         String jsonResponse = "{\"type\":\"operation_failed\",\"message\":\"Operation failed\"}";
+        Request mockRequest = createMockRequest();
         Response mockResponse = createMockResponse(400, jsonResponse);
 
         APIException exception = new APIException(
-            400, "operation_failed", null, "Operation failed", jsonResponse, mockResponse
+            400, "operation_failed", null, "Operation failed", jsonResponse, mockRequest, mockResponse
         );
 
         List<String> params = exception.getParams();
@@ -82,21 +92,193 @@ void shouldHandleMissingParamsGracefully() {
     @Test
     @DisplayName("Should create meaningful toString representation")
     void shouldCreateMeaningfulToString() {
-        String jsonResponse = "{\"type\":\"payment\",\"api_error_code\":\"card_declined\",\"message\":\"Card was declined\"}";
+        String jsonResponse = "{\"type\":\"payment\",\"api_error_code\":\"payment_processing_failed\",\"message\":\"Card was declined\"}";
+        Request mockRequest = createMockRequest();
         Response mockResponse = createMockResponse(402, jsonResponse);
 
         APIException exception = new PaymentException(
-            402, "payment", "card_declined", "Card was declined", jsonResponse, mockResponse
+            402, "payment", BadRequestApiErrorCode.PAYMENT_PROCESSING_FAILED, "Card was declined", jsonResponse, mockRequest, mockResponse
         );
 
         String toString = exception.toString();
         assertTrue(toString.contains("PaymentException"));
         assertTrue(toString.contains("statusCode=402"));
         assertTrue(toString.contains("type='payment'"));
-        assertTrue(toString.contains("apiErrorCode='card_declined'"));
+        assertTrue(toString.contains("apiErrorCode='payment_processing_failed'"));
         assertTrue(toString.contains("Card was declined"));
     }
 
+    @Test
+    @DisplayName("Should handle strongly-typed error type enum")
+    void shouldHandleStronglyTypedErrorTypeEnum() {
+        String jsonResponse = "{\"type\":\"invalid_request\",\"api_error_code\":\"duplicate_entry\",\"message\":\"Duplicate entry\"}";
+        Request mockRequest = createMockRequest();
+        Response mockResponse = createMockResponse(400, jsonResponse);
+
+        APIException exception = new APIException(
+            400, "invalid_request", BadRequestApiErrorCode.DUPLICATE_ENTRY, "Duplicate entry", jsonResponse, mockRequest, mockResponse
+        );
+
+        assertEquals(ErrorType.INVALID_REQUEST, exception.getErrorType());
+        assertTrue(exception.getErrorType().isKnown());
+        assertEquals("invalid_request", exception.getType());
+    }
+
+    @Test
+    @DisplayName("Should handle unknown error type gracefully")
+    void shouldHandleUnknownErrorTypeGracefully() {
+        String jsonResponse = "{\"type\":\"future_error_type\",\"message\":\"Some future error\"}";
+        Request mockRequest = createMockRequest();
+        Response mockResponse = createMockResponse(400, jsonResponse);
+
+        APIException exception = new APIException(
+            400, "future_error_type", null, "Some future error", jsonResponse, mockRequest, mockResponse
+        );
+
+        assertEquals(ErrorType._UNKNOWN, exception.getErrorType());
+        assertFalse(exception.getErrorType().isKnown());
+        assertEquals("future_error_type", exception.getType()); // Raw value still accessible
+    }
+
+    @Test
+    @DisplayName("Should extract error_cause_id from response")
+    void shouldExtractErrorCauseIdFromResponse() {
+        String jsonResponse = "{\"type\":\"payment\",\"api_error_code\":\"payment_processing_failed\",\"message\":\"Payment failed\",\"error_cause_id\":\"card_declined_do_not_honor\"}";
+        Request mockRequest = createMockRequest();
+        Response mockResponse = createMockResponse(402, jsonResponse);
+
+        APIException exception = new PaymentException(
+            402, "payment", BadRequestApiErrorCode.PAYMENT_PROCESSING_FAILED, "Payment failed", jsonResponse, mockRequest, mockResponse
+        );
+
+        assertEquals("card_declined_do_not_honor", exception.getErrorCauseId());
+    }
+
+    @Test
+    @DisplayName("Should handle unknown api_error_code with _UNKNOWN enum")
+    void shouldHandleUnknownApiErrorCodeWithUnknownEnum() {
+        String jsonResponse = "{\"type\":\"invalid_request\",\"api_error_code\":\"some_future_error_code\",\"message\":\"Unknown error\"}";
+        Request mockRequest = createMockRequest();
+        Response mockResponse = createMockResponse(400, jsonResponse);
+
+        // Simulate parsing an unknown error code
+        ApiErrorCode errorCode = BadRequestApiErrorCode.fromString("some_future_error_code");
+
+        APIException exception = new APIException(
+            400, "invalid_request", errorCode, "Unknown error", jsonResponse, mockRequest, mockResponse
+        );
+
+        assertEquals(BadRequestApiErrorCode._UNKNOWN, exception.getApiErrorCode());
+        assertFalse(((BadRequestApiErrorCode) exception.getApiErrorCode()).isKnown());
+        assertNull(exception.getApiErrorCodeRaw()); // _UNKNOWN has null value
+    }
+
+    @Test
+    @DisplayName("Should be retryable for 429 status code")
+    void shouldBeRetryableFor429() {
+        String jsonResponse = "{\"type\":\"invalid_request\",\"message\":\"Rate limit exceeded\"}";
+        Request mockRequest = createMockRequest();
+        Response mockResponse = createMockResponse(429, jsonResponse);
+
+        APIException exception = new APIException(
+            429, "invalid_request", null, "Rate limit exceeded", jsonResponse, mockRequest, mockResponse
+        );
+
+        assertTrue(exception.isRetryable());
+    }
+
+    @Test
+    @DisplayName("Should be retryable for 5xx status codes except 501")
+    void shouldBeRetryableFor5xxExcept501() {
+        String jsonResponse = "{\"type\":\"operation_failed\",\"message\":\"Server error\"}";
+        Request mockRequest = createMockRequest();
+
+        // 500 should be retryable
+        APIException exception500 = new APIException(
+            500, "operation_failed", null, "Server error", jsonResponse, mockRequest, createMockResponse(500, jsonResponse)
+        );
+        assertTrue(exception500.isRetryable());
+
+        // 502 should be retryable
+        APIException exception502 = new APIException(
+            502, "operation_failed", null, "Bad gateway", jsonResponse, mockRequest, createMockResponse(502, jsonResponse)
+        );
+        assertTrue(exception502.isRetryable());
+
+        // 503 should be retryable
+        APIException exception503 = new APIException(
+            503, "operation_failed", null, "Service unavailable", jsonResponse, mockRequest, createMockResponse(503, jsonResponse)
+        );
+        assertTrue(exception503.isRetryable());
+
+        // 501 should NOT be retryable
+        APIException exception501 = new APIException(
+            501, "operation_failed", null, "Not implemented", jsonResponse, mockRequest, createMockResponse(501, jsonResponse)
+        );
+        assertFalse(exception501.isRetryable());
+    }
+
+    @Test
+    @DisplayName("Should NOT be retryable for 4xx status codes except 429")
+    void shouldNotBeRetryableFor4xxExcept429() {
+        String jsonResponse = "{\"type\":\"invalid_request\",\"message\":\"Bad request\"}";
+        Request mockRequest = createMockRequest();
+
+        // 400 should NOT be retryable
+        APIException exception400 = new APIException(
+            400, "invalid_request", null, "Bad request", jsonResponse, mockRequest, createMockResponse(400, jsonResponse)
+        );
+        assertFalse(exception400.isRetryable());
+
+        // 401 should NOT be retryable
+        APIException exception401 = new APIException(
+            401, "invalid_request", null, "Unauthorized", jsonResponse, mockRequest, createMockResponse(401, jsonResponse)
+        );
+        assertFalse(exception401.isRetryable());
+
+        // 404 should NOT be retryable
+        APIException exception404 = new APIException(
+            404, "invalid_request", null, "Not found", jsonResponse, mockRequest, createMockResponse(404, jsonResponse)
+        );
+        assertFalse(exception404.isRetryable());
+    }
+
+    @Test
+    @DisplayName("Should inherit getUrl from HttpException")
+    void shouldInheritGetUrl() {
+        String jsonResponse = "{\"type\":\"invalid_request\",\"message\":\"Error\"}";
+        Request mockRequest = createMockRequest();
+        Response mockResponse = createMockResponse(400, jsonResponse);
+
+        APIException exception = new APIException(
+            400, "invalid_request", null, "Error", jsonResponse, mockRequest, mockResponse
+        );
+
+        assertEquals("https://test-site.chargebee.com/api/v2/customers", exception.getUrl());
+    }
+
+    @Test
+    @DisplayName("Should inherit getHttpMethod from HttpException")
+    void shouldInheritGetHttpMethod() {
+        String jsonResponse = "{\"type\":\"invalid_request\",\"message\":\"Error\"}";
+        Request mockRequest = createMockRequest();
+        Response mockResponse = createMockResponse(400, jsonResponse);
+
+        APIException exception = new APIException(
+            400, "invalid_request", null, "Error", jsonResponse, mockRequest, mockResponse
+        );
+
+        assertEquals("POST", exception.getHttpMethod());
+    }
+
+    private Request createMockRequest() {
+        return Request.builder()
+            .method("POST")
+            .url("https://test-site.chargebee.com/api/v2/customers")
+            .header("Authorization", "Basic dGVzdF9hcGlfa2V5Og==")
+            .build();
+    }
+
     private Response createMockResponse(int statusCode, String body) {
         Map<String, List<String>> headers = new HashMap<>();
         return new Response(statusCode, headers, body.getBytes());
diff --git a/src/test/java/com/chargebee/v4/exceptions/ClientErrorExceptionTest.java b/src/test/java/com/chargebee/v4/exceptions/ClientErrorExceptionTest.java
new file mode 100644
index 00000000..cece1b84
--- /dev/null
+++ b/src/test/java/com/chargebee/v4/exceptions/ClientErrorExceptionTest.java
@@ -0,0 +1,254 @@
+package com.chargebee.v4.exceptions;
+
+import com.chargebee.v4.transport.Request;
+import com.chargebee.v4.transport.Response;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@DisplayName("ClientErrorException Tests")
+class ClientErrorExceptionTest {
+
+    private static final String TEST_URL = "https://test-site.chargebee.com/api/v2/customers";
+
+    @Nested
+    @DisplayName("Status Code Helper Tests")
+    class StatusCodeHelperTests {
+
+        @Test
+        @DisplayName("should identify 400 as bad request")
+        void shouldIdentify400AsBadRequest() {
+            ClientErrorException exception = createException(400);
+            assertTrue(exception.isBadRequest());
+        }
+
+        @Test
+        @DisplayName("should identify 401 as unauthorized")
+        void shouldIdentify401AsUnauthorized() {
+            ClientErrorException exception = createException(401);
+            assertTrue(exception.isUnauthorized());
+        }
+
+        @Test
+        @DisplayName("should identify 403 as forbidden")
+        void shouldIdentify403AsForbidden() {
+            ClientErrorException exception = createException(403);
+            assertTrue(exception.isForbidden());
+        }
+
+        @Test
+        @DisplayName("should identify 404 as not found")
+        void shouldIdentify404AsNotFound() {
+            ClientErrorException exception = createException(404);
+            assertTrue(exception.isNotFound());
+        }
+
+        @Test
+        @DisplayName("should identify 405 as method not allowed")
+        void shouldIdentify405AsMethodNotAllowed() {
+            ClientErrorException exception = createException(405);
+            assertTrue(exception.isMethodNotAllowed());
+        }
+
+        @Test
+        @DisplayName("should identify 409 as conflict")
+        void shouldIdentify409AsConflict() {
+            ClientErrorException exception = createException(409);
+            assertTrue(exception.isConflict());
+        }
+
+        @Test
+        @DisplayName("should identify 422 as unprocessable entity")
+        void shouldIdentify422AsUnprocessableEntity() {
+            ClientErrorException exception = createException(422);
+            assertTrue(exception.isUnprocessableEntity());
+        }
+
+        @Test
+        @DisplayName("should identify 429 as too many requests")
+        void shouldIdentify429AsTooManyRequests() {
+            ClientErrorException exception = createException(429);
+            assertTrue(exception.isTooManyRequests());
+        }
+
+        @Test
+        @DisplayName("TOO_MANY_REQUESTS constant should be 429")
+        void tooManyRequestsConstantShouldBe429() {
+            assertEquals(429, ClientErrorException.TOO_MANY_REQUESTS);
+        }
+    }
+
+    @Nested
+    @DisplayName("isRetryable Tests")
+    class IsRetryableTests {
+
+        @Test
+        @DisplayName("429 Too Many Requests should be retryable")
+        void shouldBeRetryableFor429() {
+            ClientErrorException exception = createException(429);
+            assertTrue(exception.isRetryable());
+        }
+
+        @ParameterizedTest
+        @ValueSource(ints = {400, 401, 403, 404, 405, 409, 422})
+        @DisplayName("other client errors should not be retryable")
+        void shouldNotBeRetryableForOtherErrors(int statusCode) {
+            ClientErrorException exception = createException(statusCode);
+            assertFalse(exception.isRetryable());
+        }
+    }
+
+    @Nested
+    @DisplayName("Retry-After Header Tests")
+    class RetryAfterHeaderTests {
+
+        @Test
+        @DisplayName("should parse Retry-After header in seconds")
+        void shouldParseRetryAfterInSeconds() {
+            Map<String, List<String>> headers = new HashMap<>();
+            headers.put("Retry-After", Arrays.asList("30"));
+            Response response = new Response(429, headers, "".getBytes());
+            Request request = createRequest();
+
+            ClientErrorException exception = new ClientErrorException(429, "Too Many Requests", request, response);
+
+            assertEquals(30000L, exception.getRetryAfterMs());
+        }
+
+        @Test
+        @DisplayName("should return -1 when Retry-After header is missing")
+        void shouldReturnNegativeOneWhenHeaderMissing() {
+            ClientErrorException exception = createException(429);
+            assertEquals(-1L, exception.getRetryAfterMs());
+        }
+
+        @Test
+        @DisplayName("should return -1 when response is null")
+        void shouldReturnNegativeOneWhenResponseNull() {
+            Request request = createRequest();
+            ClientErrorException exception = new ClientErrorException(429, "Too Many Requests", request, null);
+
+            assertEquals(-1L, exception.getRetryAfterMs());
+        }
+
+        @Test
+        @DisplayName("should return -1 for non-numeric Retry-After value")
+        void shouldReturnNegativeOneForNonNumericValue() {
+            Map<String, List<String>> headers = new HashMap<>();
+            headers.put("Retry-After", Arrays.asList("Wed, 21 Oct 2024 07:28:00 GMT"));
+            Response response = new Response(429, headers, "".getBytes());
+            Request request = createRequest();
+
+            ClientErrorException exception = new ClientErrorException(429, "Too Many Requests", request, response);
+
+            assertEquals(-1L, exception.getRetryAfterMs());
+        }
+
+        @Test
+        @DisplayName("should handle whitespace in Retry-After value")
+        void shouldHandleWhitespaceInRetryAfterValue() {
+            Map<String, List<String>> headers = new HashMap<>();
+            headers.put("Retry-After", Arrays.asList("  60  "));
+            Response response = new Response(429, headers, "".getBytes());
+            Request request = createRequest();
+
+            ClientErrorException exception = new ClientErrorException(429, "Too Many Requests", request, response);
+
+            assertEquals(60000L, exception.getRetryAfterMs());
+        }
+    }
+
+    @Nested
+    @DisplayName("Exception Hierarchy Tests")
+    class ExceptionHierarchyTests {
+
+        @Test
+        @DisplayName("should be instance of HttpException")
+        void shouldBeInstanceOfHttpException() {
+            ClientErrorException exception = createException(400);
+            assertTrue(exception instanceof HttpException);
+        }
+
+        @Test
+        @DisplayName("should be instance of TransportException")
+        void shouldBeInstanceOfTransportException() {
+            ClientErrorException exception = createException(400);
+            assertTrue(exception instanceof TransportException);
+        }
+
+        @Test
+        @DisplayName("should be catchable as HttpException")
+        void shouldBeCatchableAsHttpException() {
+            try {
+                throw createException(404);
+            } catch (HttpException e) {
+                assertTrue(e instanceof ClientErrorException);
+                assertEquals(404, e.getStatusCode());
+            }
+        }
+    }
+
+    @Nested
+    @DisplayName("Inherited Methods Tests")
+    class InheritedMethodsTests {
+
+        @Test
+        @DisplayName("should inherit isClientError returning true")
+        void shouldInheritIsClientError() {
+            ClientErrorException exception = createException(400);
+            assertTrue(exception.isClientError());
+        }
+
+        @Test
+        @DisplayName("should inherit isServerError returning false")
+        void shouldInheritIsServerError() {
+            ClientErrorException exception = createException(400);
+            assertFalse(exception.isServerError());
+        }
+
+        @Test
+        @DisplayName("should inherit getUrl")
+        void shouldInheritGetUrl() {
+            ClientErrorException exception = createException(400);
+            assertEquals(TEST_URL, exception.getUrl());
+        }
+
+        @Test
+        @DisplayName("should inherit getResponseBody")
+        void shouldInheritGetResponseBody() {
+            Response response = createResponse(400, "{\"error\":\"bad request\"}");
+            Request request = createRequest();
+            ClientErrorException exception = new ClientErrorException(400, "Bad Request", request, response);
+
+            assertEquals("{\"error\":\"bad request\"}", exception.getResponseBody());
+        }
+    }
+
+    private ClientErrorException createException(int statusCode) {
+        Request request = createRequest();
+        Response response = createResponse(statusCode, "{}");
+        return new ClientErrorException(statusCode, "Error " + statusCode, request, response);
+    }
+
+    private Request createRequest() {
+        return Request.builder()
+            .method("GET")
+            .url(TEST_URL)
+            .build();
+    }
+
+    private Response createResponse(int statusCode, String body) {
+        Map<String, List<String>> headers = new HashMap<>();
+        return new Response(statusCode, headers, body.getBytes());
+    }
+}
+
diff --git a/src/test/java/com/chargebee/v4/exceptions/ConfigurationExceptionTest.java b/src/test/java/com/chargebee/v4/exceptions/ConfigurationExceptionTest.java
new file mode 100644
index 00000000..94f41fca
--- /dev/null
+++ b/src/test/java/com/chargebee/v4/exceptions/ConfigurationExceptionTest.java
@@ -0,0 +1,170 @@
+package com.chargebee.v4.exceptions;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@DisplayName("ConfigurationException Tests")
+class ConfigurationExceptionTest {
+
+    @Nested
+    @DisplayName("Constructor Tests")
+    class ConstructorTests {
+
+        @Test
+        @DisplayName("should create exception with message only")
+        void shouldCreateWithMessageOnly() {
+            ConfigurationException exception = new ConfigurationException("Missing API key");
+
+            assertEquals("Missing API key", exception.getMessage());
+            assertNull(exception.getCause());
+        }
+
+        @Test
+        @DisplayName("should create exception with message and cause")
+        void shouldCreateWithMessageAndCause() {
+            IllegalArgumentException cause = new IllegalArgumentException("Invalid format");
+            ConfigurationException exception = new ConfigurationException("Invalid URL format", cause);
+
+            assertEquals("Invalid URL format", exception.getMessage());
+            assertEquals(cause, exception.getCause());
+        }
+    }
+
+    @Nested
+    @DisplayName("isRetryable Tests")
+    class IsRetryableTests {
+
+        @Test
+        @DisplayName("should never be retryable")
+        void shouldNeverBeRetryable() {
+            ConfigurationException exception = new ConfigurationException("Config error");
+            assertFalse(exception.isRetryable());
+        }
+
+        @Test
+        @DisplayName("should never be retryable even with cause")
+        void shouldNeverBeRetryableEvenWithCause() {
+            ConfigurationException exception = new ConfigurationException(
+                "Config error", 
+                new RuntimeException("cause")
+            );
+            assertFalse(exception.isRetryable());
+        }
+    }
+
+    @Nested
+    @DisplayName("toString Tests")
+    class ToStringTests {
+
+        @Test
+        @DisplayName("should include class name in toString")
+        void shouldIncludeClassNameInToString() {
+            ConfigurationException exception = new ConfigurationException("Error");
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("ConfigurationException"));
+        }
+
+        @Test
+        @DisplayName("should include message in toString")
+        void shouldIncludeMessageInToString() {
+            ConfigurationException exception = new ConfigurationException("API key is required");
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("API key is required"));
+        }
+
+        @Test
+        @DisplayName("should include cause in toString when present")
+        void shouldIncludeCauseInToString() {
+            IllegalArgumentException cause = new IllegalArgumentException("bad value");
+            ConfigurationException exception = new ConfigurationException("Config error", cause);
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("cause=IllegalArgumentException"));
+            assertTrue(toString.contains("bad value"));
+        }
+
+        @Test
+        @DisplayName("should handle cause with null message")
+        void shouldHandleCauseWithNullMessage() {
+            RuntimeException cause = new RuntimeException();
+            ConfigurationException exception = new ConfigurationException("Config error", cause);
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("cause=RuntimeException"));
+            // Should not contain "null" from the cause message
+        }
+    }
+
+    @Nested
+    @DisplayName("Exception Hierarchy Tests")
+    class ExceptionHierarchyTests {
+
+        @Test
+        @DisplayName("should be instance of RuntimeException")
+        void shouldBeInstanceOfRuntimeException() {
+            ConfigurationException exception = new ConfigurationException("Error");
+            assertTrue(exception instanceof RuntimeException);
+        }
+
+        @Test
+        @DisplayName("should be unchecked exception")
+        void shouldBeUncheckedException() {
+            // This compiles without try-catch because it's a RuntimeException
+            ConfigurationException exception = new ConfigurationException("Error");
+            assertNotNull(exception);
+        }
+
+        @Test
+        @DisplayName("should NOT be instance of Exception subclass TransportException")
+        void shouldNotBeInstanceOfTransportException() {
+            ConfigurationException exception = new ConfigurationException("Error");
+            // ConfigurationException is RuntimeException, not TransportException (which is checked Exception)
+            assertFalse(TransportException.class.isAssignableFrom(ConfigurationException.class));
+        }
+    }
+
+    @Nested
+    @DisplayName("Usage Pattern Tests")
+    class UsagePatternTests {
+
+        @Test
+        @DisplayName("should be throwable without checked exception handling")
+        void shouldBeThrowableWithoutCheckedExceptionHandling() {
+            // This test validates that ConfigurationException is a RuntimeException
+            // and can be thrown without requiring a throws clause
+            assertThrows(ConfigurationException.class, () -> {
+                throw new ConfigurationException("Missing required config");
+            });
+        }
+
+        @Test
+        @DisplayName("should be catchable as RuntimeException")
+        void shouldBeCatchableAsRuntimeException() {
+            try {
+                throw new ConfigurationException("Error");
+            } catch (RuntimeException e) {
+                assertTrue(e instanceof ConfigurationException);
+            }
+        }
+
+        @Test
+        @DisplayName("common configuration errors should have descriptive messages")
+        void commonConfigurationErrorsShouldHaveDescriptiveMessages() {
+            ConfigurationException apiKeyError = new ConfigurationException("API key is required");
+            ConfigurationException urlError = new ConfigurationException("Invalid URL: not-a-url");
+
+            assertTrue(apiKeyError.getMessage().contains("API key"));
+            assertTrue(urlError.getMessage().contains("Invalid URL"));
+        }
+    }
+}
+
diff --git a/src/test/java/com/chargebee/v4/exceptions/HttpExceptionTest.java b/src/test/java/com/chargebee/v4/exceptions/HttpExceptionTest.java
new file mode 100644
index 00000000..b111b794
--- /dev/null
+++ b/src/test/java/com/chargebee/v4/exceptions/HttpExceptionTest.java
@@ -0,0 +1,234 @@
+package com.chargebee.v4.exceptions;
+
+import com.chargebee.v4.transport.Request;
+import com.chargebee.v4.transport.Response;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@DisplayName("HttpException Tests")
+class HttpExceptionTest {
+
+    private static final String TEST_URL = "https://test-site.chargebee.com/api/v2/customers";
+
+    @Nested
+    @DisplayName("Constructor Tests")
+    class ConstructorTests {
+
+        @Test
+        @DisplayName("should create exception with all parameters")
+        void shouldCreateWithAllParameters() {
+            Request request = createRequest("GET", TEST_URL);
+            Response response = createResponse(404, "{\"error\":\"not found\"}");
+
+            HttpException exception = new HttpException(404, "Not Found", request, response);
+
+            assertEquals(404, exception.getStatusCode());
+            assertEquals("Not Found", exception.getMessage());
+            assertNotNull(exception.getRequest());
+            assertNotNull(exception.getResponse());
+        }
+
+        @Test
+        @DisplayName("should create exception with cause")
+        void shouldCreateWithCause() {
+            Request request = createRequest("POST", TEST_URL);
+            Response response = createResponse(500, "{\"error\":\"server error\"}");
+            Exception cause = new RuntimeException("parsing error");
+
+            HttpException exception = new HttpException(500, "Server Error", request, response, cause);
+
+            assertEquals(500, exception.getStatusCode());
+            assertEquals(cause, exception.getCause());
+        }
+    }
+
+    @Nested
+    @DisplayName("Status Code Helpers Tests")
+    class StatusCodeHelperTests {
+
+        @Test
+        @DisplayName("should identify client error (4xx)")
+        void shouldIdentifyClientError() {
+            HttpException exception = createException(400);
+            assertTrue(exception.isClientError());
+            assertFalse(exception.isServerError());
+        }
+
+        @Test
+        @DisplayName("should identify server error (5xx)")
+        void shouldIdentifyServerError() {
+            HttpException exception = createException(503);
+            assertFalse(exception.isClientError());
+            assertTrue(exception.isServerError());
+        }
+
+        @Test
+        @DisplayName("should identify 401 as client error")
+        void shouldIdentify401AsClientError() {
+            HttpException exception = createException(401);
+            assertTrue(exception.isClientError());
+        }
+
+        @Test
+        @DisplayName("should identify 499 as client error")
+        void shouldIdentify499AsClientError() {
+            HttpException exception = createException(499);
+            assertTrue(exception.isClientError());
+        }
+
+        @Test
+        @DisplayName("should identify 500 as server error")
+        void shouldIdentify500AsServerError() {
+            HttpException exception = createException(500);
+            assertTrue(exception.isServerError());
+        }
+
+        @Test
+        @DisplayName("should identify 599 as server error")
+        void shouldIdentify599AsServerError() {
+            HttpException exception = createException(599);
+            assertTrue(exception.isServerError());
+        }
+
+        @Test
+        @DisplayName("should not identify 200 as error")
+        void shouldNotIdentify200AsError() {
+            HttpException exception = createException(200);
+            assertFalse(exception.isClientError());
+            assertFalse(exception.isServerError());
+        }
+    }
+
+    @Nested
+    @DisplayName("Response Body Tests")
+    class ResponseBodyTests {
+
+        @Test
+        @DisplayName("should return response body as string")
+        void shouldReturnResponseBodyAsString() {
+            Response response = createResponse(400, "{\"error\":\"bad request\"}");
+            HttpException exception = new HttpException(400, "Bad Request", createRequest("GET", TEST_URL), response);
+
+            assertEquals("{\"error\":\"bad request\"}", exception.getResponseBody());
+        }
+
+        @Test
+        @DisplayName("should return null when response is null")
+        void shouldReturnNullWhenResponseIsNull() {
+            HttpException exception = new HttpException(500, "Error", createRequest("GET", TEST_URL), null);
+
+            assertNull(exception.getResponseBody());
+        }
+    }
+
+    @Nested
+    @DisplayName("Request Context Tests")
+    class RequestContextTests {
+
+        @Test
+        @DisplayName("should return URL from request")
+        void shouldReturnUrlFromRequest() {
+            Request request = createRequest("GET", TEST_URL);
+            HttpException exception = new HttpException(404, "Not Found", request, createResponse(404, ""));
+
+            assertEquals(TEST_URL, exception.getUrl());
+        }
+
+        @Test
+        @DisplayName("should return HTTP method from request")
+        void shouldReturnHttpMethodFromRequest() {
+            Request request = createRequest("DELETE", TEST_URL);
+            HttpException exception = new HttpException(404, "Not Found", request, createResponse(404, ""));
+
+            assertEquals("DELETE", exception.getHttpMethod());
+        }
+    }
+
+    @Nested
+    @DisplayName("isRetryable Tests")
+    class IsRetryableTests {
+
+        @Test
+        @DisplayName("base HttpException should not be retryable")
+        void shouldNotBeRetryableByDefault() {
+            HttpException exception = createException(500);
+            assertFalse(exception.isRetryable());
+        }
+    }
+
+    @Nested
+    @DisplayName("toString Tests")
+    class ToStringTests {
+
+        @Test
+        @DisplayName("should include status code in toString")
+        void shouldIncludeStatusCodeInToString() {
+            HttpException exception = createException(404);
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("statusCode=404"));
+        }
+
+        @Test
+        @DisplayName("should include message in toString")
+        void shouldIncludeMessageInToString() {
+            Request request = createRequest("GET", TEST_URL);
+            Response response = createResponse(404, "");
+            HttpException exception = new HttpException(404, "Resource not found", request, response);
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("Resource not found"));
+        }
+
+        @Test
+        @DisplayName("should include URL in toString")
+        void shouldIncludeUrlInToString() {
+            HttpException exception = createException(500);
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains(TEST_URL));
+        }
+    }
+
+    @Nested
+    @DisplayName("Exception Hierarchy Tests")
+    class ExceptionHierarchyTests {
+
+        @Test
+        @DisplayName("should be instance of TransportException")
+        void shouldBeInstanceOfTransportException() {
+            HttpException exception = createException(400);
+            assertTrue(exception instanceof TransportException);
+        }
+    }
+
+    private HttpException createException(int statusCode) {
+        Request request = createRequest("GET", TEST_URL);
+        Response response = createResponse(statusCode, "{\"status\":" + statusCode + "}");
+        return new HttpException(statusCode, "Error " + statusCode, request, response);
+    }
+
+    private Request createRequest(String method, String url) {
+        return Request.builder()
+            .method(method)
+            .url(url)
+            .build();
+    }
+
+    private Response createResponse(int statusCode, String body) {
+        Map<String, List<String>> headers = new HashMap<>();
+        return new Response(statusCode, headers, body.getBytes());
+    }
+}
+
diff --git a/src/test/java/com/chargebee/v4/exceptions/NetworkExceptionTest.java b/src/test/java/com/chargebee/v4/exceptions/NetworkExceptionTest.java
new file mode 100644
index 00000000..3e5908d9
--- /dev/null
+++ b/src/test/java/com/chargebee/v4/exceptions/NetworkExceptionTest.java
@@ -0,0 +1,162 @@
+package com.chargebee.v4.exceptions;
+
+import com.chargebee.v4.transport.Request;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.net.UnknownHostException;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@DisplayName("NetworkException Tests")
+class NetworkExceptionTest {
+
+    private static final String TEST_URL = "https://test-site.chargebee.com/api/v2/customers";
+
+    @Nested
+    @DisplayName("Constructor Tests")
+    class ConstructorTests {
+
+        @Test
+        @DisplayName("should create exception with message and cause only")
+        void shouldCreateWithMessageAndCauseOnly() {
+            IOException cause = new IOException("Connection refused");
+            NetworkException exception = new NetworkException("Network error", cause);
+
+            assertEquals("Network error", exception.getMessage());
+            assertEquals(cause, exception.getCause());
+            assertNull(exception.getRequest());
+            assertNull(exception.getUrl());
+        }
+
+        @Test
+        @DisplayName("should create exception with full context")
+        void shouldCreateWithFullContext() {
+            UnknownHostException cause = new UnknownHostException("unknown-host.com");
+            Request request = createRequest("GET", TEST_URL);
+
+            NetworkException exception = new NetworkException("DNS lookup failed", cause, request);
+
+            assertEquals("DNS lookup failed", exception.getMessage());
+            assertEquals(cause, exception.getCause());
+            assertNotNull(exception.getRequest());
+            assertEquals(TEST_URL, exception.getUrl());
+            assertEquals("GET", exception.getHttpMethod());
+        }
+    }
+
+    @Nested
+    @DisplayName("isRetryable Tests")
+    class IsRetryableTests {
+
+        @Test
+        @DisplayName("should always be retryable")
+        void shouldAlwaysBeRetryable() {
+            NetworkException exception = new NetworkException("Network error", new IOException());
+            assertTrue(exception.isRetryable());
+        }
+
+        @Test
+        @DisplayName("should be retryable even with UnknownHostException")
+        void shouldBeRetryableEvenWithUnknownHostException() {
+            NetworkException exception = new NetworkException(
+                "DNS failed", 
+                new UnknownHostException("host.example.com")
+            );
+            assertTrue(exception.isRetryable());
+        }
+    }
+
+    @Nested
+    @DisplayName("Inherited Methods Tests")
+    class InheritedMethodsTests {
+
+        @Test
+        @DisplayName("should inherit getUrl from TransportException")
+        void shouldInheritGetUrl() {
+            Request request = createRequest("POST", TEST_URL);
+            NetworkException exception = new NetworkException("Error", new IOException(), request);
+
+            assertEquals(TEST_URL, exception.getUrl());
+        }
+
+        @Test
+        @DisplayName("should inherit getHttpMethod from TransportException")
+        void shouldInheritGetHttpMethod() {
+            Request request = createRequest("DELETE", TEST_URL);
+            NetworkException exception = new NetworkException("Error", new IOException(), request);
+
+            assertEquals("DELETE", exception.getHttpMethod());
+        }
+
+        @Test
+        @DisplayName("should inherit getRequest from TransportException")
+        void shouldInheritGetRequest() {
+            Request request = createRequest("GET", TEST_URL);
+            NetworkException exception = new NetworkException("Error", new IOException(), request);
+
+            assertSame(request, exception.getRequest());
+        }
+    }
+
+    @Nested
+    @DisplayName("toString Tests")
+    class ToStringTests {
+
+        @Test
+        @DisplayName("should include NetworkException in toString")
+        void shouldIncludeClassNameInToString() {
+            NetworkException exception = new NetworkException("Connection refused", new IOException());
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("NetworkException"));
+        }
+
+        @Test
+        @DisplayName("should include request context in toString")
+        void shouldIncludeRequestContextInToString() {
+            Request request = createRequest("GET", TEST_URL);
+            NetworkException exception = new NetworkException("Error", new IOException("timeout"), request);
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("method='GET'"));
+            assertTrue(toString.contains(TEST_URL));
+            assertTrue(toString.contains("IOException"));
+        }
+    }
+
+    @Nested
+    @DisplayName("Exception Hierarchy Tests")
+    class ExceptionHierarchyTests {
+
+        @Test
+        @DisplayName("should be instance of TransportException")
+        void shouldBeInstanceOfTransportException() {
+            NetworkException exception = new NetworkException("Error", new IOException());
+            assertTrue(exception instanceof TransportException);
+        }
+
+        @Test
+        @DisplayName("should be catchable as TransportException")
+        void shouldBeCatchableAsTransportException() {
+            try {
+                throw new NetworkException("Network error", new IOException());
+            } catch (TransportException e) {
+                assertTrue(e instanceof NetworkException);
+                assertTrue(e.isRetryable());
+            }
+        }
+    }
+
+    private Request createRequest(String method, String url) {
+        return Request.builder()
+            .method(method)
+            .url(url)
+            .build();
+    }
+}
+
diff --git a/src/test/java/com/chargebee/v4/exceptions/ServerErrorExceptionTest.java b/src/test/java/com/chargebee/v4/exceptions/ServerErrorExceptionTest.java
new file mode 100644
index 00000000..ba6b3a87
--- /dev/null
+++ b/src/test/java/com/chargebee/v4/exceptions/ServerErrorExceptionTest.java
@@ -0,0 +1,225 @@
+package com.chargebee.v4.exceptions;
+
+import com.chargebee.v4.transport.Request;
+import com.chargebee.v4.transport.Response;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@DisplayName("ServerErrorException Tests")
+class ServerErrorExceptionTest {
+
+    private static final String TEST_URL = "https://test-site.chargebee.com/api/v2/customers";
+
+    @Nested
+    @DisplayName("Status Code Helper Tests")
+    class StatusCodeHelperTests {
+
+        @Test
+        @DisplayName("should identify 500 as internal server error")
+        void shouldIdentify500AsInternalServerError() {
+            ServerErrorException exception = createException(500);
+            assertTrue(exception.isInternalServerError());
+        }
+
+        @Test
+        @DisplayName("should identify 501 as not implemented")
+        void shouldIdentify501AsNotImplemented() {
+            ServerErrorException exception = createException(501);
+            assertTrue(exception.isNotImplemented());
+        }
+
+        @Test
+        @DisplayName("should identify 502 as bad gateway")
+        void shouldIdentify502AsBadGateway() {
+            ServerErrorException exception = createException(502);
+            assertTrue(exception.isBadGateway());
+        }
+
+        @Test
+        @DisplayName("should identify 503 as service unavailable")
+        void shouldIdentify503AsServiceUnavailable() {
+            ServerErrorException exception = createException(503);
+            assertTrue(exception.isServiceUnavailable());
+        }
+
+        @Test
+        @DisplayName("should identify 504 as gateway timeout")
+        void shouldIdentify504AsGatewayTimeout() {
+            ServerErrorException exception = createException(504);
+            assertTrue(exception.isGatewayTimeout());
+        }
+
+        @Test
+        @DisplayName("should not identify 500 as bad gateway")
+        void shouldNotIdentify500AsBadGateway() {
+            ServerErrorException exception = createException(500);
+            assertFalse(exception.isBadGateway());
+        }
+    }
+
+    @Nested
+    @DisplayName("isRetryable Tests")
+    class IsRetryableTests {
+
+        @ParameterizedTest
+        @ValueSource(ints = {500, 502, 503, 504})
+        @DisplayName("should be retryable for most 5xx errors")
+        void shouldBeRetryableForMost5xx(int statusCode) {
+            ServerErrorException exception = createException(statusCode);
+            assertTrue(exception.isRetryable(), "Status " + statusCode + " should be retryable");
+        }
+
+        @Test
+        @DisplayName("501 Not Implemented should NOT be retryable")
+        void shouldNotBeRetryableFor501() {
+            ServerErrorException exception = createException(501);
+            assertFalse(exception.isRetryable());
+        }
+
+        @ParameterizedTest
+        @ValueSource(ints = {505, 506, 507, 508, 510, 511})
+        @DisplayName("should be retryable for other 5xx errors")
+        void shouldBeRetryableForOther5xx(int statusCode) {
+            ServerErrorException exception = createException(statusCode);
+            assertTrue(exception.isRetryable());
+        }
+    }
+
+    @Nested
+    @DisplayName("Exception Hierarchy Tests")
+    class ExceptionHierarchyTests {
+
+        @Test
+        @DisplayName("should be instance of HttpException")
+        void shouldBeInstanceOfHttpException() {
+            ServerErrorException exception = createException(500);
+            assertTrue(exception instanceof HttpException);
+        }
+
+        @Test
+        @DisplayName("should be instance of TransportException")
+        void shouldBeInstanceOfTransportException() {
+            ServerErrorException exception = createException(500);
+            assertTrue(exception instanceof TransportException);
+        }
+
+        @Test
+        @DisplayName("should be catchable as HttpException")
+        void shouldBeCatchableAsHttpException() {
+            try {
+                throw createException(503);
+            } catch (HttpException e) {
+                assertTrue(e instanceof ServerErrorException);
+                assertEquals(503, e.getStatusCode());
+            }
+        }
+
+        @Test
+        @DisplayName("should be catchable as TransportException with isRetryable")
+        void shouldBeCatchableAsTransportExceptionWithIsRetryable() {
+            try {
+                throw createException(502);
+            } catch (TransportException e) {
+                assertTrue(e.isRetryable());
+            }
+        }
+    }
+
+    @Nested
+    @DisplayName("Inherited Methods Tests")
+    class InheritedMethodsTests {
+
+        @Test
+        @DisplayName("should inherit isServerError returning true")
+        void shouldInheritIsServerError() {
+            ServerErrorException exception = createException(500);
+            assertTrue(exception.isServerError());
+        }
+
+        @Test
+        @DisplayName("should inherit isClientError returning false")
+        void shouldInheritIsClientError() {
+            ServerErrorException exception = createException(500);
+            assertFalse(exception.isClientError());
+        }
+
+        @Test
+        @DisplayName("should inherit getUrl")
+        void shouldInheritGetUrl() {
+            ServerErrorException exception = createException(500);
+            assertEquals(TEST_URL, exception.getUrl());
+        }
+
+        @Test
+        @DisplayName("should inherit getHttpMethod")
+        void shouldInheritGetHttpMethod() {
+            Request request = Request.builder()
+                .method("POST")
+                .url(TEST_URL)
+                .build();
+            Response response = createResponse(500, "{}");
+            ServerErrorException exception = new ServerErrorException(500, "Error", request, response);
+
+            assertEquals("POST", exception.getHttpMethod());
+        }
+    }
+
+    @Nested
+    @DisplayName("Constructor Tests")
+    class ConstructorTests {
+
+        @Test
+        @DisplayName("should create exception with all parameters")
+        void shouldCreateWithAllParameters() {
+            Request request = createRequest();
+            Response response = createResponse(500, "{\"error\":\"internal error\"}");
+
+            ServerErrorException exception = new ServerErrorException(500, "Internal Server Error", request, response);
+
+            assertEquals(500, exception.getStatusCode());
+            assertEquals("Internal Server Error", exception.getMessage());
+            assertNotNull(exception.getRequest());
+            assertNotNull(exception.getResponse());
+        }
+
+        @Test
+        @DisplayName("should create exception with cause")
+        void shouldCreateWithCause() {
+            Request request = createRequest();
+            Response response = createResponse(500, "{}");
+            Exception cause = new RuntimeException("database error");
+
+            ServerErrorException exception = new ServerErrorException(500, "Error", request, response, cause);
+
+            assertEquals(cause, exception.getCause());
+        }
+    }
+
+    private ServerErrorException createException(int statusCode) {
+        Request request = createRequest();
+        Response response = createResponse(statusCode, "{}");
+        return new ServerErrorException(statusCode, "Error " + statusCode, request, response);
+    }
+
+    private Request createRequest() {
+        return Request.builder()
+            .method("GET")
+            .url(TEST_URL)
+            .build();
+    }
+
+    private Response createResponse(int statusCode, String body) {
+        Map<String, List<String>> headers = new HashMap<>();
+        return new Response(statusCode, headers, body.getBytes());
+    }
+}
+
diff --git a/src/test/java/com/chargebee/v4/exceptions/TimeoutExceptionTest.java b/src/test/java/com/chargebee/v4/exceptions/TimeoutExceptionTest.java
new file mode 100644
index 00000000..5badead7
--- /dev/null
+++ b/src/test/java/com/chargebee/v4/exceptions/TimeoutExceptionTest.java
@@ -0,0 +1,262 @@
+package com.chargebee.v4.exceptions;
+
+import com.chargebee.v4.transport.Request;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import java.net.SocketTimeoutException;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@DisplayName("TimeoutException Tests")
+class TimeoutExceptionTest {
+
+    private static final String TEST_URL = "https://test-site.chargebee.com/api/v2/customers";
+
+    @Nested
+    @DisplayName("Constructor Tests")
+    class ConstructorTests {
+
+        @Test
+        @DisplayName("should create connect timeout exception")
+        void shouldCreateConnectTimeoutException() {
+            SocketTimeoutException cause = new SocketTimeoutException("connect timed out");
+            
+            TimeoutException exception = new TimeoutException(
+                TimeoutException.CONNECT, 
+                "Connection timeout", 
+                cause
+            );
+
+            assertEquals("connect", exception.getTimeoutType());
+            assertEquals("Connection timeout", exception.getMessage());
+            assertEquals(cause, exception.getCause());
+            assertNull(exception.getRequest());
+        }
+
+        @Test
+        @DisplayName("should create read timeout exception")
+        void shouldCreateReadTimeoutException() {
+            SocketTimeoutException cause = new SocketTimeoutException("Read timed out");
+            
+            TimeoutException exception = new TimeoutException(
+                TimeoutException.READ, 
+                "Read timeout", 
+                cause
+            );
+
+            assertEquals("read", exception.getTimeoutType());
+            assertEquals("Read timeout", exception.getMessage());
+        }
+
+        @Test
+        @DisplayName("should create timeout exception with full context")
+        void shouldCreateWithFullContext() {
+            SocketTimeoutException cause = new SocketTimeoutException("connect timed out");
+            Request request = createRequest("POST", TEST_URL);
+
+            TimeoutException exception = new TimeoutException(
+                TimeoutException.CONNECT, 
+                "Connection timeout", 
+                cause, 
+                request
+            );
+
+            assertEquals("connect", exception.getTimeoutType());
+            assertNotNull(exception.getRequest());
+            assertEquals(TEST_URL, exception.getUrl());
+            assertEquals("POST", exception.getHttpMethod());
+        }
+    }
+
+    @Nested
+    @DisplayName("Timeout Type Tests")
+    class TimeoutTypeTests {
+
+        @Test
+        @DisplayName("should identify connect timeout")
+        void shouldIdentifyConnectTimeout() {
+            TimeoutException exception = new TimeoutException(
+                TimeoutException.CONNECT, 
+                "Timeout", 
+                new SocketTimeoutException()
+            );
+
+            assertTrue(exception.isConnectTimeout());
+            assertFalse(exception.isReadTimeout());
+        }
+
+        @Test
+        @DisplayName("should identify read timeout")
+        void shouldIdentifyReadTimeout() {
+            TimeoutException exception = new TimeoutException(
+                TimeoutException.READ, 
+                "Timeout", 
+                new SocketTimeoutException()
+            );
+
+            assertFalse(exception.isConnectTimeout());
+            assertTrue(exception.isReadTimeout());
+        }
+
+        @Test
+        @DisplayName("should handle custom timeout type")
+        void shouldHandleCustomTimeoutType() {
+            TimeoutException exception = new TimeoutException(
+                "custom", 
+                "Custom timeout", 
+                new SocketTimeoutException()
+            );
+
+            assertFalse(exception.isConnectTimeout());
+            assertFalse(exception.isReadTimeout());
+            assertEquals("custom", exception.getTimeoutType());
+        }
+
+        @Test
+        @DisplayName("CONNECT constant should be 'connect'")
+        void connectConstantShouldBeConnect() {
+            assertEquals("connect", TimeoutException.CONNECT);
+        }
+
+        @Test
+        @DisplayName("READ constant should be 'read'")
+        void readConstantShouldBeRead() {
+            assertEquals("read", TimeoutException.READ);
+        }
+    }
+
+    @Nested
+    @DisplayName("isRetryable Tests")
+    class IsRetryableTests {
+
+        @Test
+        @DisplayName("connect timeout should be retryable")
+        void connectTimeoutShouldBeRetryable() {
+            TimeoutException exception = new TimeoutException(
+                TimeoutException.CONNECT, 
+                "Timeout", 
+                new SocketTimeoutException()
+            );
+
+            assertTrue(exception.isRetryable());
+        }
+
+        @Test
+        @DisplayName("read timeout should be retryable")
+        void readTimeoutShouldBeRetryable() {
+            TimeoutException exception = new TimeoutException(
+                TimeoutException.READ, 
+                "Timeout", 
+                new SocketTimeoutException()
+            );
+
+            assertTrue(exception.isRetryable());
+        }
+    }
+
+    @Nested
+    @DisplayName("Inherited Methods Tests")
+    class InheritedMethodsTests {
+
+        @Test
+        @DisplayName("should inherit getUrl from TransportException")
+        void shouldInheritGetUrl() {
+            Request request = createRequest("GET", TEST_URL);
+            TimeoutException exception = new TimeoutException(
+                TimeoutException.READ, 
+                "Timeout", 
+                new SocketTimeoutException(), 
+                request
+            );
+
+            assertEquals(TEST_URL, exception.getUrl());
+        }
+
+        @Test
+        @DisplayName("should return null URL when request not provided")
+        void shouldReturnNullUrlWhenNoRequest() {
+            TimeoutException exception = new TimeoutException(
+                TimeoutException.READ, 
+                "Timeout", 
+                new SocketTimeoutException()
+            );
+
+            assertNull(exception.getUrl());
+        }
+    }
+
+    @Nested
+    @DisplayName("toString Tests")
+    class ToStringTests {
+
+        @Test
+        @DisplayName("should include timeout type in toString")
+        void shouldIncludeTimeoutTypeInToString() {
+            TimeoutException exception = new TimeoutException(
+                TimeoutException.CONNECT, 
+                "Connection timeout", 
+                new SocketTimeoutException()
+            );
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("TimeoutException"));
+            assertTrue(toString.contains("timeoutType='connect'"));
+        }
+
+        @Test
+        @DisplayName("should include request context in toString")
+        void shouldIncludeRequestContextInToString() {
+            Request request = createRequest("GET", TEST_URL);
+            TimeoutException exception = new TimeoutException(
+                TimeoutException.READ, 
+                "Read timeout", 
+                new SocketTimeoutException(), 
+                request
+            );
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("method='GET'"));
+            assertTrue(toString.contains(TEST_URL));
+        }
+    }
+
+    @Nested
+    @DisplayName("Exception Hierarchy Tests")
+    class ExceptionHierarchyTests {
+
+        @Test
+        @DisplayName("should be instance of TransportException")
+        void shouldBeInstanceOfTransportException() {
+            TimeoutException exception = new TimeoutException(
+                TimeoutException.CONNECT, 
+                "Timeout", 
+                new SocketTimeoutException()
+            );
+
+            assertTrue(exception instanceof TransportException);
+        }
+
+        @Test
+        @DisplayName("should be catchable as TransportException")
+        void shouldBeCatchableAsTransportException() {
+            try {
+                throw new TimeoutException(TimeoutException.READ, "Timeout", new SocketTimeoutException());
+            } catch (TransportException e) {
+                assertTrue(e instanceof TimeoutException);
+                assertTrue(e.isRetryable());
+            }
+        }
+    }
+
+    private Request createRequest(String method, String url) {
+        return Request.builder()
+            .method(method)
+            .url(url)
+            .build();
+    }
+}
+
diff --git a/src/test/java/com/chargebee/v4/exceptions/TransportExceptionTest.java b/src/test/java/com/chargebee/v4/exceptions/TransportExceptionTest.java
new file mode 100644
index 00000000..585294bb
--- /dev/null
+++ b/src/test/java/com/chargebee/v4/exceptions/TransportExceptionTest.java
@@ -0,0 +1,180 @@
+package com.chargebee.v4.exceptions;
+
+import com.chargebee.v4.transport.Request;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@DisplayName("TransportException Tests")
+class TransportExceptionTest {
+
+    private static final String TEST_URL = "https://test-site.chargebee.com/api/v2/customers";
+    private static final String TEST_MESSAGE = "Transport error occurred";
+
+    @Nested
+    @DisplayName("Constructor Tests")
+    class ConstructorTests {
+
+        @Test
+        @DisplayName("should create exception with message only")
+        void shouldCreateWithMessageOnly() {
+            TransportException exception = new TransportException(TEST_MESSAGE);
+
+            assertEquals(TEST_MESSAGE, exception.getMessage());
+            assertNull(exception.getCause());
+            assertNull(exception.getRequest());
+            assertNull(exception.getUrl());
+            assertNull(exception.getHttpMethod());
+        }
+
+        @Test
+        @DisplayName("should create exception with message and cause")
+        void shouldCreateWithMessageAndCause() {
+            Exception cause = new RuntimeException("root cause");
+            TransportException exception = new TransportException(TEST_MESSAGE, cause);
+
+            assertEquals(TEST_MESSAGE, exception.getMessage());
+            assertEquals(cause, exception.getCause());
+            assertNull(exception.getRequest());
+        }
+
+        @Test
+        @DisplayName("should create exception with message, cause, and request")
+        void shouldCreateWithMessageCauseAndRequest() {
+            Exception cause = new RuntimeException("root cause");
+            Request request = createRequest("GET", TEST_URL);
+
+            TransportException exception = new TransportException(TEST_MESSAGE, cause, request);
+
+            assertEquals(TEST_MESSAGE, exception.getMessage());
+            assertEquals(cause, exception.getCause());
+            assertNotNull(exception.getRequest());
+            assertEquals(TEST_URL, exception.getUrl());
+            assertEquals("GET", exception.getHttpMethod());
+        }
+
+        @Test
+        @DisplayName("should create exception with message and request only")
+        void shouldCreateWithMessageAndRequest() {
+            Request request = createRequest("POST", TEST_URL);
+
+            TransportException exception = new TransportException(TEST_MESSAGE, request);
+
+            assertEquals(TEST_MESSAGE, exception.getMessage());
+            assertNull(exception.getCause());
+            assertEquals(TEST_URL, exception.getUrl());
+            assertEquals("POST", exception.getHttpMethod());
+        }
+    }
+
+    @Nested
+    @DisplayName("Request Context Tests")
+    class RequestContextTests {
+
+        @Test
+        @DisplayName("should return null URL when request is null")
+        void shouldReturnNullUrlWhenRequestIsNull() {
+            TransportException exception = new TransportException(TEST_MESSAGE);
+            assertNull(exception.getUrl());
+        }
+
+        @Test
+        @DisplayName("should return null method when request is null")
+        void shouldReturnNullMethodWhenRequestIsNull() {
+            TransportException exception = new TransportException(TEST_MESSAGE);
+            assertNull(exception.getHttpMethod());
+        }
+
+        @Test
+        @DisplayName("should return URL from request")
+        void shouldReturnUrlFromRequest() {
+            Request request = createRequest("GET", TEST_URL);
+            TransportException exception = new TransportException(TEST_MESSAGE, request);
+
+            assertEquals(TEST_URL, exception.getUrl());
+        }
+
+        @Test
+        @DisplayName("should return HTTP method from request")
+        void shouldReturnHttpMethodFromRequest() {
+            Request request = createRequest("DELETE", TEST_URL);
+            TransportException exception = new TransportException(TEST_MESSAGE, request);
+
+            assertEquals("DELETE", exception.getHttpMethod());
+        }
+    }
+
+    @Nested
+    @DisplayName("isRetryable Tests")
+    class IsRetryableTests {
+
+        @Test
+        @DisplayName("base TransportException should not be retryable by default")
+        void shouldNotBeRetryableByDefault() {
+            TransportException exception = new TransportException(TEST_MESSAGE);
+            assertFalse(exception.isRetryable());
+        }
+    }
+
+    @Nested
+    @DisplayName("toString Tests")
+    class ToStringTests {
+
+        @Test
+        @DisplayName("should include message in toString")
+        void shouldIncludeMessageInToString() {
+            TransportException exception = new TransportException(TEST_MESSAGE);
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("TransportException"));
+            assertTrue(toString.contains(TEST_MESSAGE));
+        }
+
+        @Test
+        @DisplayName("should include request details in toString when available")
+        void shouldIncludeRequestDetailsInToString() {
+            Request request = createRequest("PUT", TEST_URL);
+            TransportException exception = new TransportException(TEST_MESSAGE, request);
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("method='PUT'"));
+            assertTrue(toString.contains("url='" + TEST_URL + "'"));
+        }
+
+        @Test
+        @DisplayName("should include cause details in toString when available")
+        void shouldIncludeCauseDetailsInToString() {
+            Exception cause = new RuntimeException("network failure");
+            TransportException exception = new TransportException(TEST_MESSAGE, cause);
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("cause=RuntimeException"));
+            assertTrue(toString.contains("network failure"));
+        }
+
+        @Test
+        @DisplayName("should handle cause with null message")
+        void shouldHandleCauseWithNullMessage() {
+            Exception cause = new RuntimeException();
+            TransportException exception = new TransportException(TEST_MESSAGE, cause);
+
+            String toString = exception.toString();
+
+            assertTrue(toString.contains("cause=RuntimeException"));
+            assertFalse(toString.contains("null"));
+        }
+    }
+
+    private Request createRequest(String method, String url) {
+        return Request.builder()
+            .method(method)
+            .url(url)
+            .build();
+    }
+}
+
diff --git a/src/test/java/com/chargebee/v4/internal/JsonUtilTest.java b/src/test/java/com/chargebee/v4/internal/JsonUtilTest.java
new file mode 100644
index 00000000..5fc09d30
--- /dev/null
+++ b/src/test/java/com/chargebee/v4/internal/JsonUtilTest.java
@@ -0,0 +1,1037 @@
+package com.chargebee.v4.internal;
+
+import org.junit.jupiter.api.*;
+
+import java.math.BigDecimal;
+import java.sql.Timestamp;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * Comprehensive test suite for JsonUtil.
+ * Inspired by Gson's testing strategies to battle-test our JSON parsing.
+ */
+@DisplayName("JsonUtil Tests")
+class JsonUtilTest {
+
+    // ========== getString Tests ==========
+    @Nested
+    @DisplayName("getString Tests")
+    class GetStringTests {
+
+        @Test
+        @DisplayName("should extract simple string value")
+        void shouldExtractSimpleString() {
+            String json = "{\"name\": \"John\"}";
+            assertEquals("John", JsonUtil.getString(json, "name"));
+        }
+
+        @Test
+        @DisplayName("should extract string with spaces")
+        void shouldExtractStringWithSpaces() {
+            String json = "{\"message\": \"Hello World\"}";
+            assertEquals("Hello World", JsonUtil.getString(json, "message"));
+        }
+
+        @Test
+        @DisplayName("should handle escaped quotes in string")
+        void shouldHandleEscapedQuotes() {
+            String json = "{\"text\": \"He said \\\"Hello\\\"\"}";
+            assertEquals("He said \"Hello\"", JsonUtil.getString(json, "text"));
+        }
+
+        @Test
+        @DisplayName("should handle escaped backslashes")
+        void shouldHandleEscapedBackslashes() {
+            String json = "{\"path\": \"C:\\\\Users\\\\test\"}";
+            assertEquals("C:\\Users\\test", JsonUtil.getString(json, "path"));
+        }
+
+        @Test
+        @DisplayName("should handle newlines and tabs")
+        void shouldHandleNewlinesAndTabs() {
+            String json = "{\"text\": \"line1\\nline2\\ttab\"}";
+            assertEquals("line1\nline2\ttab", JsonUtil.getString(json, "text"));
+        }
+
+        @Test
+        @DisplayName("should return null for missing key")
+        void shouldReturnNullForMissingKey() {
+            String json = "{\"name\": \"John\"}";
+            assertNull(JsonUtil.getString(json, "missing"));
+        }
+
+        @Test
+        @DisplayName("should return null for null json")
+        void shouldReturnNullForNullJson() {
+            assertNull(JsonUtil.getString(null, "key"));
+        }
+
+        @Test
+        @DisplayName("should return null for null key")
+        void shouldReturnNullForNullKey() {
+            assertNull(JsonUtil.getString("{\"name\": \"John\"}", null));
+        }
+
+        @Test
+        @DisplayName("should extract empty string")
+        void shouldExtractEmptyString() {
+            String json = "{\"empty\": \"\"}";
+            assertEquals("", JsonUtil.getString(json, "empty"));
+        }
+
+        @Test
+        @DisplayName("should extract string with unicode characters")
+        void shouldExtractUnicodeString() {
+            String json = "{\"text\": \"日本語 中文 한국어\"}";
+            assertEquals("日本語 中文 한국어", JsonUtil.getString(json, "text"));
+        }
+
+        @Test
+        @DisplayName("should extract string with special JSON characters")
+        void shouldExtractStringWithSpecialChars() {
+            String json = "{\"text\": \"test: \\\"value\\\", more\"}";
+            assertEquals("test: \"value\", more", JsonUtil.getString(json, "text"));
+        }
+    }
+
+    // ========== getLong Tests ==========
+    @Nested
+    @DisplayName("getLong Tests")
+    class GetLongTests {
+
+        @Test
+        @DisplayName("should extract positive long")
+        void shouldExtractPositiveLong() {
+            String json = "{\"id\": 12345678901234}";
+            assertEquals(12345678901234L, JsonUtil.getLong(json, "id"));
+        }
+
+        @Test
+        @DisplayName("should extract negative long")
+        void shouldExtractNegativeLong() {
+            String json = "{\"value\": -9876543210}";
+            assertEquals(-9876543210L, JsonUtil.getLong(json, "value"));
+        }
+
+        @Test
+        @DisplayName("should extract zero")
+        void shouldExtractZero() {
+            String json = "{\"count\": 0}";
+            assertEquals(0L, JsonUtil.getLong(json, "count"));
+        }
+
+        @Test
+        @DisplayName("should return null for missing key")
+        void shouldReturnNullForMissingKey() {
+            String json = "{\"id\": 123}";
+            assertNull(JsonUtil.getLong(json, "missing"));
+        }
+
+        @Test
+        @DisplayName("should return null for null json")
+        void shouldReturnNullForNullJson() {
+            assertNull(JsonUtil.getLong(null, "key"));
+        }
+
+        @Test
+        @DisplayName("should extract epoch timestamp")
+        void shouldExtractEpochTimestamp() {
+            String json = "{\"created_at\": 1605530769}";
+            assertEquals(1605530769L, JsonUtil.getLong(json, "created_at"));
+        }
+
+        @Test
+        @DisplayName("should extract resource_version (large long)")
+        void shouldExtractResourceVersion() {
+            String json = "{\"resource_version\": 1605530769000}";
+            assertEquals(1605530769000L, JsonUtil.getLong(json, "resource_version"));
+        }
+    }
+
+    // ========== getInteger Tests ==========
+    @Nested
+    @DisplayName("getInteger Tests")
+    class GetIntegerTests {
+
+        @Test
+        @DisplayName("should extract positive integer")
+        void shouldExtractPositiveInteger() {
+            String json = "{\"count\": 42}";
+            assertEquals(42, JsonUtil.getInteger(json, "count"));
+        }
+
+        @Test
+        @DisplayName("should extract negative integer")
+        void shouldExtractNegativeInteger() {
+            String json = "{\"offset\": -10}";
+            assertEquals(-10, JsonUtil.getInteger(json, "offset"));
+        }
+
+        @Test
+        @DisplayName("should return null for missing key")
+        void shouldReturnNullForMissingKey() {
+            String json = "{\"count\": 42}";
+            assertNull(JsonUtil.getInteger(json, "missing"));
+        }
+    }
+
+    // ========== getBoolean Tests ==========
+    @Nested
+    @DisplayName("getBoolean Tests")
+    class GetBooleanTests {
+
+        @Test
+        @DisplayName("should extract true")
+        void shouldExtractTrue() {
+            String json = "{\"active\": true}";
+            assertTrue(JsonUtil.getBoolean(json, "active"));
+        }
+
+        @Test
+        @DisplayName("should extract false")
+        void shouldExtractFalse() {
+            String json = "{\"deleted\": false}";
+            assertFalse(JsonUtil.getBoolean(json, "deleted"));
+        }
+
+        @Test
+        @DisplayName("should return null for missing key")
+        void shouldReturnNullForMissingKey() {
+            String json = "{\"active\": true}";
+            assertNull(JsonUtil.getBoolean(json, "missing"));
+        }
+
+        @Test
+        @DisplayName("should return null for null json")
+        void shouldReturnNullForNullJson() {
+            assertNull(JsonUtil.getBoolean(null, "key"));
+        }
+    }
+
+    // ========== getDouble Tests ==========
+    @Nested
+    @DisplayName("getDouble Tests")
+    class GetDoubleTests {
+
+        @Test
+        @DisplayName("should extract positive double")
+        void shouldExtractPositiveDouble() {
+            String json = "{\"price\": 99.99}";
+            assertEquals(99.99, JsonUtil.getDouble(json, "price"), 0.001);
+        }
+
+        @Test
+        @DisplayName("should extract negative double")
+        void shouldExtractNegativeDouble() {
+            String json = "{\"balance\": -123.45}";
+            assertEquals(-123.45, JsonUtil.getDouble(json, "balance"), 0.001);
+        }
+
+        @Test
+        @DisplayName("should extract exchange rate")
+        void shouldExtractExchangeRate() {
+            String json = "{\"exchange_rate\": 1.0}";
+            assertEquals(1.0, JsonUtil.getDouble(json, "exchange_rate"), 0.001);
+        }
+
+        @Test
+        @DisplayName("should extract integer as double")
+        void shouldExtractIntegerAsDouble() {
+            String json = "{\"amount\": 10000}";
+            assertEquals(10000.0, JsonUtil.getDouble(json, "amount"), 0.001);
+        }
+    }
+
+    // ========== getBigDecimal Tests ==========
+    @Nested
+    @DisplayName("getBigDecimal Tests")
+    class GetBigDecimalTests {
+
+        @Test
+        @DisplayName("should extract decimal value")
+        void shouldExtractDecimalValue() {
+            String json = "{\"amount\": 1234.56}";
+            assertEquals(new BigDecimal("1234.56"), JsonUtil.getBigDecimal(json, "amount"));
+        }
+
+        @Test
+        @DisplayName("should extract integer as BigDecimal")
+        void shouldExtractIntegerAsBigDecimal() {
+            String json = "{\"amount\": 10000}";
+            assertEquals(new BigDecimal("10000"), JsonUtil.getBigDecimal(json, "amount"));
+        }
+    }
+
+    // ========== getObject Tests ==========
+    @Nested
+    @DisplayName("getObject Tests")
+    class GetObjectTests {
+
+        @Test
+        @DisplayName("should extract simple nested object")
+        void shouldExtractSimpleNestedObject() {
+            String json = "{\"customer\": {\"id\": \"cust_123\", \"name\": \"John\"}}";
+            String result = JsonUtil.getObject(json, "customer");
+            assertNotNull(result);
+            assertTrue(result.contains("\"id\": \"cust_123\""));
+            assertTrue(result.contains("\"name\": \"John\""));
+        }
+
+        @Test
+        @DisplayName("should extract deeply nested object")
+        void shouldExtractDeeplyNestedObject() {
+            String json = "{\"data\": {\"customer\": {\"address\": {\"city\": \"NYC\"}}}}";
+            String dataObj = JsonUtil.getObject(json, "data");
+            assertNotNull(dataObj);
+            String customerObj = JsonUtil.getObject(dataObj, "customer");
+            assertNotNull(customerObj);
+            String addressObj = JsonUtil.getObject(customerObj, "address");
+            assertNotNull(addressObj);
+            assertEquals("NYC", JsonUtil.getString(addressObj, "city"));
+        }
+
+        @Test
+        @DisplayName("should handle object with nested arrays")
+        void shouldHandleObjectWithNestedArrays() {
+            String json = "{\"transaction\": {\"id\": \"txn_123\", \"linked_invoices\": [{\"id\": \"inv_1\"}]}}";
+            String result = JsonUtil.getObject(json, "transaction");
+            assertNotNull(result);
+            assertTrue(result.contains("linked_invoices"));
+            assertTrue(result.contains("inv_1"));
+        }
+
+        @Test
+        @DisplayName("should handle object with escaped strings")
+        void shouldHandleObjectWithEscapedStrings() {
+            String json = "{\"data\": {\"text\": \"Hello \\\"World\\\"\"}}";
+            String result = JsonUtil.getObject(json, "data");
+            assertNotNull(result);
+            assertTrue(result.contains("Hello \\\"World\\\""));
+        }
+
+        @Test
+        @DisplayName("should return null for missing key")
+        void shouldReturnNullForMissingKey() {
+            String json = "{\"customer\": {\"id\": \"123\"}}";
+            assertNull(JsonUtil.getObject(json, "missing"));
+        }
+
+        @Test
+        @DisplayName("should return null when value is not object")
+        void shouldReturnNullWhenNotObject() {
+            String json = "{\"name\": \"John\"}";
+            assertNull(JsonUtil.getObject(json, "name"));
+        }
+
+        @Test
+        @DisplayName("should extract empty object")
+        void shouldExtractEmptyObject() {
+            String json = "{\"metadata\": {}}";
+            assertEquals("{}", JsonUtil.getObject(json, "metadata"));
+        }
+    }
+
+    // ========== getArray Tests - THE CRITICAL FIX ==========
+    @Nested
+    @DisplayName("getArray Tests")
+    class GetArrayTests {
+
+        @Test
+        @DisplayName("should extract simple array of strings")
+        void shouldExtractSimpleArrayOfStrings() {
+            String json = "{\"tags\": [\"a\", \"b\", \"c\"]}";
+            String result = JsonUtil.getArray(json, "tags");
+            assertNotNull(result);
+            assertEquals("[\"a\", \"b\", \"c\"]", result);
+        }
+
+        @Test
+        @DisplayName("should extract empty array")
+        void shouldExtractEmptyArray() {
+            String json = "{\"items\": []}";
+            assertEquals("[]", JsonUtil.getArray(json, "items"));
+        }
+
+        @Test
+        @DisplayName("should extract array of objects")
+        void shouldExtractArrayOfObjects() {
+            String json = "{\"list\": [{\"id\": 1}, {\"id\": 2}]}";
+            String result = JsonUtil.getArray(json, "list");
+            assertNotNull(result);
+            assertTrue(result.startsWith("["));
+            assertTrue(result.endsWith("]"));
+            assertTrue(result.contains("{\"id\": 1}"));
+            assertTrue(result.contains("{\"id\": 2}"));
+        }
+
+        @Test
+        @DisplayName("should handle array with nested arrays - THE BUG FIX TEST")
+        void shouldHandleArrayWithNestedArrays() {
+            // This is the exact case that was failing before the fix!
+            String json = "{\"list\": [{\"transaction\": {\"linked_invoices\": [{\"id\": \"inv_1\"}], \"linked_refunds\": []}}]}";
+            String result = JsonUtil.getArray(json, "list");
+            assertNotNull(result);
+            assertTrue(result.startsWith("["));
+            assertTrue(result.endsWith("]"));
+            // Verify the entire array is extracted, not truncated at first ]
+            assertTrue(result.contains("linked_invoices"));
+            assertTrue(result.contains("linked_refunds"));
+            assertTrue(result.contains("inv_1"));
+        }
+
+        @Test
+        @DisplayName("should handle complex nested structure from transaction API")
+        void shouldHandleComplexNestedStructure() {
+            // Real-world example from the bug report
+            String json = "{\"list\": [{\"transaction\": {" +
+                "\"id\": \"txn_AzZhUGSPAkLskJQo\"," +
+                "\"customer_id\": \"cbdemo_dave\"," +
+                "\"amount\": 10000," +
+                "\"linked_invoices\": [{" +
+                    "\"invoice_id\": \"DemoInv_103\"," +
+                    "\"applied_amount\": 10000," +
+                    "\"applied_at\": 1605530769" +
+                "}]," +
+                "\"linked_refunds\": []," +
+                "\"payment_method_details\": \"{\\\"card\\\":{\\\"iin\\\":\\\"555555\\\"}}\"" +
+                "}}]}";
+            
+            String result = JsonUtil.getArray(json, "list");
+            assertNotNull(result);
+            assertTrue(result.startsWith("["));
+            assertTrue(result.endsWith("]"));
+            
+            // Critical: verify we got the complete array, not truncated
+            assertTrue(result.contains("txn_AzZhUGSPAkLskJQo"));
+            assertTrue(result.contains("linked_invoices"));
+            assertTrue(result.contains("DemoInv_103"));
+            assertTrue(result.contains("linked_refunds"));
+        }
+
+        @Test
+        @DisplayName("should handle array with deeply nested objects")
+        void shouldHandleArrayWithDeeplyNestedObjects() {
+            String json = "{\"data\": [{\"level1\": {\"level2\": {\"level3\": [{\"value\": 1}]}}}]}";
+            String result = JsonUtil.getArray(json, "data");
+            assertNotNull(result);
+            assertTrue(result.contains("level1"));
+            assertTrue(result.contains("level2"));
+            assertTrue(result.contains("level3"));
+            assertTrue(result.contains("value"));
+        }
+
+        @Test
+        @DisplayName("should handle array with escaped strings containing brackets")
+        void shouldHandleArrayWithEscapedBrackets() {
+            String json = "{\"messages\": [\"text with [brackets]\", \"another [one]\"]}";
+            String result = JsonUtil.getArray(json, "messages");
+            assertNotNull(result);
+            assertTrue(result.contains("[brackets]"));
+            assertTrue(result.contains("[one]"));
+        }
+
+        @Test
+        @DisplayName("should handle array with JSON string field containing brackets")
+        void shouldHandleArrayWithJsonStringField() {
+            // payment_method_details contains a JSON string with brackets
+            String json = "{\"list\": [{\"details\": \"{\\\"array\\\":[1,2,3]}\"}]}";
+            String result = JsonUtil.getArray(json, "list");
+            assertNotNull(result);
+            assertTrue(result.contains("details"));
+        }
+
+        @Test
+        @DisplayName("should return null for missing array key")
+        void shouldReturnNullForMissingKey() {
+            String json = "{\"data\": [1, 2, 3]}";
+            assertNull(JsonUtil.getArray(json, "missing"));
+        }
+
+        @Test
+        @DisplayName("should return null when value is not array")
+        void shouldReturnNullWhenNotArray() {
+            String json = "{\"name\": \"John\"}";
+            assertNull(JsonUtil.getArray(json, "name"));
+        }
+
+        @Test
+        @DisplayName("should handle multiple arrays in same object")
+        void shouldHandleMultipleArrays() {
+            String json = "{\"first\": [1, 2], \"second\": [3, 4], \"third\": [5, 6]}";
+            assertEquals("[1, 2]", JsonUtil.getArray(json, "first"));
+            assertEquals("[3, 4]", JsonUtil.getArray(json, "second"));
+            assertEquals("[5, 6]", JsonUtil.getArray(json, "third"));
+        }
+
+        @Test
+        @DisplayName("should handle array with null values")
+        void shouldHandleArrayWithNulls() {
+            String json = "{\"values\": [null, \"a\", null, \"b\"]}";
+            String result = JsonUtil.getArray(json, "values");
+            assertNotNull(result);
+            assertTrue(result.contains("null"));
+        }
+    }
+
+    // ========== parseObjectArray Tests ==========
+    @Nested
+    @DisplayName("parseObjectArray Tests")
+    class ParseObjectArrayTests {
+
+        @Test
+        @DisplayName("should parse array of simple objects")
+        void shouldParseArrayOfSimpleObjects() {
+            String arrayJson = "[{\"id\": 1}, {\"id\": 2}, {\"id\": 3}]";
+            List<String> objects = JsonUtil.parseObjectArray(arrayJson);
+            assertEquals(3, objects.size());
+            assertTrue(objects.get(0).contains("\"id\": 1"));
+            assertTrue(objects.get(1).contains("\"id\": 2"));
+            assertTrue(objects.get(2).contains("\"id\": 3"));
+        }
+
+        @Test
+        @DisplayName("should parse array of complex objects")
+        void shouldParseArrayOfComplexObjects() {
+            String arrayJson = "[{\"transaction\": {\"id\": \"txn_1\", \"items\": [1, 2]}}, {\"transaction\": {\"id\": \"txn_2\"}}]";
+            List<String> objects = JsonUtil.parseObjectArray(arrayJson);
+            assertEquals(2, objects.size());
+            assertTrue(objects.get(0).contains("txn_1"));
+            assertTrue(objects.get(1).contains("txn_2"));
+        }
+
+        @Test
+        @DisplayName("should return empty list for null input")
+        void shouldReturnEmptyListForNull() {
+            List<String> objects = JsonUtil.parseObjectArray(null);
+            assertTrue(objects.isEmpty());
+        }
+
+        @Test
+        @DisplayName("should return empty list for empty array")
+        void shouldReturnEmptyListForEmptyArray() {
+            List<String> objects = JsonUtil.parseObjectArray("[]");
+            assertTrue(objects.isEmpty());
+        }
+
+        @Test
+        @DisplayName("should return empty list for non-array input")
+        void shouldReturnEmptyListForNonArray() {
+            List<String> objects = JsonUtil.parseObjectArray("{\"id\": 1}");
+            assertTrue(objects.isEmpty());
+        }
+
+        @Test
+        @DisplayName("should handle objects with escaped strings")
+        void shouldHandleObjectsWithEscapedStrings() {
+            String arrayJson = "[{\"text\": \"Hello \\\"World\\\"\"}]";
+            List<String> objects = JsonUtil.parseObjectArray(arrayJson);
+            assertEquals(1, objects.size());
+            assertTrue(objects.get(0).contains("Hello \\\"World\\\""));
+        }
+    }
+
+    // ========== parseArrayOf* Tests ==========
+    @Nested
+    @DisplayName("parseArrayOf* Tests")
+    class ParseArrayOfTests {
+
+        @Test
+        @DisplayName("should parse array of strings")
+        void shouldParseArrayOfStrings() {
+            String arrayJson = "[\"a\", \"b\", \"c\"]";
+            List<String> result = JsonUtil.parseArrayOfString(arrayJson);
+            assertEquals(3, result.size());
+            assertEquals("a", result.get(0));
+            assertEquals("b", result.get(1));
+            assertEquals("c", result.get(2));
+        }
+
+        @Test
+        @DisplayName("should parse array of integers")
+        void shouldParseArrayOfIntegers() {
+            String arrayJson = "[1, 2, 3, -4, 0]";
+            List<Integer> result = JsonUtil.parseArrayOfInteger(arrayJson);
+            assertEquals(5, result.size());
+            assertEquals(1, result.get(0));
+            assertEquals(-4, result.get(3));
+            assertEquals(0, result.get(4));
+        }
+
+        @Test
+        @DisplayName("should parse array of longs")
+        void shouldParseArrayOfLongs() {
+            String arrayJson = "[1605530769000, 1605530770000]";
+            List<Long> result = JsonUtil.parseArrayOfLong(arrayJson);
+            assertEquals(2, result.size());
+            assertEquals(1605530769000L, result.get(0));
+        }
+
+        @Test
+        @DisplayName("should parse array of booleans")
+        void shouldParseArrayOfBooleans() {
+            String arrayJson = "[true, false, true]";
+            List<Boolean> result = JsonUtil.parseArrayOfBoolean(arrayJson);
+            assertEquals(3, result.size());
+            assertTrue(result.get(0));
+            assertFalse(result.get(1));
+            assertTrue(result.get(2));
+        }
+
+        @Test
+        @DisplayName("should parse array of doubles")
+        void shouldParseArrayOfDoubles() {
+            String arrayJson = "[1.5, 2.7, 3.14]";
+            List<Double> result = JsonUtil.parseArrayOfDouble(arrayJson);
+            assertEquals(3, result.size());
+            assertEquals(1.5, result.get(0), 0.001);
+        }
+
+        @Test
+        @DisplayName("should parse array of BigDecimal")
+        void shouldParseArrayOfBigDecimal() {
+            String arrayJson = "[123.45, 678.90]";
+            List<BigDecimal> result = JsonUtil.parseArrayOfBigDecimal(arrayJson);
+            assertEquals(2, result.size());
+        }
+
+        @Test
+        @DisplayName("should return empty list for empty arrays")
+        void shouldReturnEmptyListForEmptyArrays() {
+            assertTrue(JsonUtil.parseArrayOfString("[]").isEmpty());
+            assertTrue(JsonUtil.parseArrayOfInteger("[]").isEmpty());
+            assertTrue(JsonUtil.parseArrayOfLong("[]").isEmpty());
+            assertTrue(JsonUtil.parseArrayOfBoolean("[]").isEmpty());
+            assertTrue(JsonUtil.parseArrayOfDouble("[]").isEmpty());
+        }
+
+        @Test
+        @DisplayName("should return empty list for null input")
+        void shouldReturnEmptyListForNull() {
+            assertTrue(JsonUtil.parseArrayOfString(null).isEmpty());
+            assertTrue(JsonUtil.parseArrayOfInteger(null).isEmpty());
+        }
+    }
+
+    // ========== getTimestamp Tests ==========
+    @Nested
+    @DisplayName("getTimestamp Tests")
+    class GetTimestampTests {
+
+        @Test
+        @DisplayName("should parse epoch seconds to timestamp")
+        void shouldParseEpochSecondsToTimestamp() {
+            String json = "{\"created_at\": 1605530769}";
+            Timestamp result = JsonUtil.getTimestamp(json, "created_at");
+            assertNotNull(result);
+            assertEquals(1605530769000L, result.getTime());
+        }
+
+        @Test
+        @DisplayName("should return null for missing key")
+        void shouldReturnNullForMissingKey() {
+            String json = "{\"updated_at\": 1605530769}";
+            assertNull(JsonUtil.getTimestamp(json, "created_at"));
+        }
+    }
+
+    // ========== hasValue Tests ==========
+    @Nested
+    @DisplayName("hasValue Tests")
+    class HasValueTests {
+
+        @Test
+        @DisplayName("should return true for existing non-null value")
+        void shouldReturnTrueForExistingValue() {
+            String json = "{\"name\": \"John\", \"age\": 30}";
+            assertTrue(JsonUtil.hasValue(json, "name"));
+            assertTrue(JsonUtil.hasValue(json, "age"));
+        }
+
+        @Test
+        @DisplayName("should return false for null value")
+        void shouldReturnFalseForNullValue() {
+            String json = "{\"name\": null}";
+            assertFalse(JsonUtil.hasValue(json, "name"));
+        }
+
+        @Test
+        @DisplayName("should return false for missing key")
+        void shouldReturnFalseForMissingKey() {
+            String json = "{\"name\": \"John\"}";
+            assertFalse(JsonUtil.hasValue(json, "missing"));
+        }
+    }
+
+    // ========== parseJsonObjectToMap Tests ==========
+    @Nested
+    @DisplayName("parseJsonObjectToMap Tests")
+    class ParseJsonObjectToMapTests {
+
+        @Test
+        @DisplayName("should parse simple object to map")
+        void shouldParseSimpleObjectToMap() {
+            String json = "{\"name\": \"John\", \"age\": 30, \"active\": true}";
+            Map<String, Object> map = JsonUtil.parseJsonObjectToMap(json);
+            assertEquals("John", map.get("name"));
+            assertEquals(30L, map.get("age"));
+            assertEquals(true, map.get("active"));
+        }
+
+        @Test
+        @DisplayName("should handle nested objects")
+        void shouldHandleNestedObjects() {
+            String json = "{\"user\": {\"name\": \"John\"}}";
+            Map<String, Object> map = JsonUtil.parseJsonObjectToMap(json);
+            assertTrue(map.get("user") instanceof String);
+            assertTrue(((String) map.get("user")).contains("name"));
+        }
+
+        @Test
+        @DisplayName("should handle arrays in map")
+        void shouldHandleArraysInMap() {
+            String json = "{\"tags\": [\"a\", \"b\"]}";
+            Map<String, Object> map = JsonUtil.parseJsonObjectToMap(json);
+            assertTrue(map.get("tags") instanceof String);
+            assertTrue(((String) map.get("tags")).contains("\"a\""));
+        }
+
+        @Test
+        @DisplayName("should return empty map for empty object")
+        void shouldReturnEmptyMapForEmptyObject() {
+            Map<String, Object> map = JsonUtil.parseJsonObjectToMap("{}");
+            assertTrue(map.isEmpty());
+        }
+
+        @Test
+        @DisplayName("should return empty map for null")
+        void shouldReturnEmptyMapForNull() {
+            Map<String, Object> map = JsonUtil.parseJsonObjectToMap(null);
+            assertTrue(map.isEmpty());
+        }
+
+        @Test
+        @DisplayName("should handle null values")
+        void shouldHandleNullValues() {
+            String json = "{\"value\": null}";
+            Map<String, Object> map = JsonUtil.parseJsonObjectToMap(json);
+            assertTrue(map.containsKey("value"));
+            assertNull(map.get("value"));
+        }
+
+        @Test
+        @DisplayName("should handle double values")
+        void shouldHandleDoubleValues() {
+            String json = "{\"price\": 99.99}";
+            Map<String, Object> map = JsonUtil.parseJsonObjectToMap(json);
+            assertEquals(99.99, (Double) map.get("price"), 0.001);
+        }
+    }
+
+    // ========== toJson Tests ==========
+    @Nested
+    @DisplayName("toJson Tests")
+    class ToJsonTests {
+
+        @Test
+        @DisplayName("should serialize map to JSON")
+        void shouldSerializeMapToJson() {
+            Map<String, Object> map = new java.util.LinkedHashMap<>();
+            map.put("name", "John");
+            map.put("age", 30);
+            
+            String json = JsonUtil.toJson(map);
+            assertTrue(json.contains("\"name\":\"John\""));
+            assertTrue(json.contains("\"age\":30"));
+        }
+
+        @Test
+        @DisplayName("should serialize list to JSON")
+        void shouldSerializeListToJson() {
+            List<String> list = java.util.Arrays.asList("a", "b", "c");
+            String json = JsonUtil.toJson(list);
+            assertEquals("[\"a\",\"b\",\"c\"]", json);
+        }
+
+        @Test
+        @DisplayName("should serialize empty map")
+        void shouldSerializeEmptyMap() {
+            assertEquals("{}", JsonUtil.toJson(new java.util.HashMap<>()));
+        }
+
+        @Test
+        @DisplayName("should serialize empty list")
+        void shouldSerializeEmptyList() {
+            assertEquals("[]", JsonUtil.toJson(new java.util.ArrayList<>()));
+        }
+
+        @Test
+        @DisplayName("should escape special characters")
+        void shouldEscapeSpecialCharacters() {
+            Map<String, Object> map = new java.util.HashMap<>();
+            map.put("text", "Hello \"World\"\nNew line");
+            
+            String json = JsonUtil.toJson(map);
+            assertTrue(json.contains("\\\"World\\\""));
+            assertTrue(json.contains("\\n"));
+        }
+
+        @Test
+        @DisplayName("should serialize null values")
+        void shouldSerializeNullValues() {
+            Map<String, Object> map = new java.util.HashMap<>();
+            map.put("value", null);
+            
+            String json = JsonUtil.toJson(map);
+            assertTrue(json.contains("\"value\":null"));
+        }
+
+        @Test
+        @DisplayName("should serialize nested structures")
+        void shouldSerializeNestedStructures() {
+            Map<String, Object> inner = new java.util.HashMap<>();
+            inner.put("id", 123);
+            
+            Map<String, Object> outer = new java.util.HashMap<>();
+            outer.put("data", inner);
+            
+            String json = JsonUtil.toJson(outer);
+            assertTrue(json.contains("\"data\":{"));
+            assertTrue(json.contains("\"id\":123"));
+        }
+    }
+
+    // ========== Edge Cases and Real-World Scenarios ==========
+    @Nested
+    @DisplayName("Real-World Scenarios")
+    class RealWorldScenarios {
+
+        @Test
+        @DisplayName("should parse transaction list response correctly")
+        void shouldParseTransactionListResponse() {
+            String json = "{" +
+                "\"list\": [{\"transaction\": {" +
+                    "\"id\": \"txn_AzZhUGSPAkLskJQo\"," +
+                    "\"customer_id\": \"cbdemo_dave\"," +
+                    "\"subscription_id\": \"cbdemo_dave-sub1\"," +
+                    "\"gateway_account_id\": \"gw_AzZhUGSPAkLeQJPg\"," +
+                    "\"payment_method\": \"card\"," +
+                    "\"gateway\": \"chargebee\"," +
+                    "\"type\": \"payment\"," +
+                    "\"date\": 1605530769," +
+                    "\"exchange_rate\": 1.0," +
+                    "\"amount\": 10000," +
+                    "\"id_at_gateway\": \"cb___dev__KyVnqiSIrqRVUEN\"," +
+                    "\"status\": \"success\"," +
+                    "\"updated_at\": 1605530769," +
+                    "\"resource_version\": 1605530769000," +
+                    "\"deleted\": false," +
+                    "\"object\": \"transaction\"," +
+                    "\"masked_card_number\": \"************4444\"," +
+                    "\"currency_code\": \"USD\"," +
+                    "\"base_currency_code\": \"USD\"," +
+                    "\"amount_unused\": 0," +
+                    "\"linked_invoices\": [{" +
+                        "\"invoice_id\": \"DemoInv_103\"," +
+                        "\"applied_amount\": 10000," +
+                        "\"applied_at\": 1605530769," +
+                        "\"invoice_date\": 1605530769," +
+                        "\"invoice_total\": 10000," +
+                        "\"invoice_status\": \"paid\"" +
+                    "}]," +
+                    "\"linked_refunds\": []," +
+                    "\"payment_method_details\": \"{\\\"card\\\":{\\\"iin\\\":\\\"555555\\\",\\\"last4\\\":\\\"4444\\\"}}\"" +
+                "}}]," +
+                "\"next_offset\": null" +
+            "}";
+
+            // Test getArray with nested structures
+            String listArray = JsonUtil.getArray(json, "list");
+            assertNotNull(listArray, "list array should not be null");
+            assertTrue(listArray.startsWith("["), "Should start with [");
+            assertTrue(listArray.endsWith("]"), "Should end with ]");
+            
+            // Verify it contains the complete transaction data
+            assertTrue(listArray.contains("txn_AzZhUGSPAkLskJQo"));
+            assertTrue(listArray.contains("linked_invoices"));
+            assertTrue(listArray.contains("DemoInv_103"));
+            assertTrue(listArray.contains("linked_refunds"));
+            assertTrue(listArray.contains("payment_method_details"));
+
+            // Test parseObjectArray
+            List<String> objects = JsonUtil.parseObjectArray(listArray);
+            assertEquals(1, objects.size());
+            
+            // Test nested object extraction
+            String transactionWrapper = objects.get(0);
+            String transaction = JsonUtil.getObject(transactionWrapper, "transaction");
+            assertNotNull(transaction);
+            
+            assertEquals("txn_AzZhUGSPAkLskJQo", JsonUtil.getString(transaction, "id"));
+            assertEquals("cbdemo_dave", JsonUtil.getString(transaction, "customer_id"));
+            assertEquals(10000, JsonUtil.getInteger(transaction, "amount"));
+            assertEquals(1.0, JsonUtil.getDouble(transaction, "exchange_rate"), 0.001);
+            assertFalse(JsonUtil.getBoolean(transaction, "deleted"));
+            assertEquals(1605530769000L, JsonUtil.getLong(transaction, "resource_version"));
+            
+            // Test nested array extraction
+            String linkedInvoices = JsonUtil.getArray(transaction, "linked_invoices");
+            assertNotNull(linkedInvoices);
+            assertTrue(linkedInvoices.contains("DemoInv_103"));
+            
+            String linkedRefunds = JsonUtil.getArray(transaction, "linked_refunds");
+            assertNotNull(linkedRefunds);
+            assertEquals("[]", linkedRefunds);
+        }
+
+        @Test
+        @DisplayName("should handle customer list response")
+        void shouldHandleCustomerListResponse() {
+            String json = "{" +
+                "\"list\": [" +
+                    "{\"customer\": {\"id\": \"cust_123\", \"email\": \"test@example.com\"}}," +
+                    "{\"customer\": {\"id\": \"cust_456\", \"email\": \"user@example.com\"}}" +
+                "]," +
+                "\"next_offset\": \"offset_abc123\"" +
+            "}";
+
+            String listArray = JsonUtil.getArray(json, "list");
+            assertNotNull(listArray);
+            
+            List<String> items = JsonUtil.parseObjectArray(listArray);
+            assertEquals(2, items.size());
+            
+            String customer1 = JsonUtil.getObject(items.get(0), "customer");
+            assertEquals("cust_123", JsonUtil.getString(customer1, "id"));
+            
+            String nextOffset = JsonUtil.getString(json, "next_offset");
+            assertEquals("offset_abc123", nextOffset);
+        }
+
+        @Test
+        @DisplayName("should handle subscription with multiple nested arrays")
+        void shouldHandleSubscriptionWithMultipleNestedArrays() {
+            String json = "{" +
+                "\"subscription\": {" +
+                    "\"id\": \"sub_123\"," +
+                    "\"subscription_items\": [" +
+                        "{\"item_price_id\": \"price_1\", \"quantity\": 1}," +
+                        "{\"item_price_id\": \"price_2\", \"quantity\": 2}" +
+                    "]," +
+                    "\"addons\": [{\"id\": \"addon_1\"}]," +
+                    "\"coupons\": []," +
+                    "\"discounts\": [{\"id\": \"disc_1\", \"apply_till\": [1, 2, 3]}]" +
+                "}" +
+            "}";
+
+            String subscription = JsonUtil.getObject(json, "subscription");
+            assertNotNull(subscription);
+            
+            String items = JsonUtil.getArray(subscription, "subscription_items");
+            assertNotNull(items);
+            List<String> itemsList = JsonUtil.parseObjectArray(items);
+            assertEquals(2, itemsList.size());
+            
+            String addons = JsonUtil.getArray(subscription, "addons");
+            assertNotNull(addons);
+            
+            String coupons = JsonUtil.getArray(subscription, "coupons");
+            assertEquals("[]", coupons);
+            
+            String discounts = JsonUtil.getArray(subscription, "discounts");
+            assertNotNull(discounts);
+            // Verify nested array within object within array is handled
+            assertTrue(discounts.contains("apply_till"));
+            assertTrue(discounts.contains("[1, 2, 3]") || discounts.contains("[1,2,3]"));
+        }
+    }
+
+    // ========== Edge Cases ==========
+    @Nested
+    @DisplayName("Edge Cases")
+    class EdgeCases {
+
+        @Test
+        @DisplayName("should handle whitespace variations")
+        void shouldHandleWhitespaceVariations() {
+            String json1 = "{\"key\":\"value\"}";
+            String json2 = "{ \"key\" : \"value\" }";
+            String json3 = "{\n  \"key\"\t:\n  \"value\"\n}";
+            
+            assertEquals("value", JsonUtil.getString(json1, "key"));
+            assertEquals("value", JsonUtil.getString(json2, "key"));
+            assertEquals("value", JsonUtil.getString(json3, "key"));
+        }
+
+        @Test
+        @DisplayName("should handle keys with special characters")
+        void shouldHandleKeysWithSpecialCharacters() {
+            String json = "{\"my-key\": \"value1\", \"my_key\": \"value2\", \"my.key\": \"value3\"}";
+            assertEquals("value1", JsonUtil.getString(json, "my-key"));
+            assertEquals("value2", JsonUtil.getString(json, "my_key"));
+            assertEquals("value3", JsonUtil.getString(json, "my.key"));
+        }
+
+        @Test
+        @DisplayName("should handle very long strings")
+        void shouldHandleVeryLongStrings() {
+            StringBuilder longValue = new StringBuilder();
+            for (int i = 0; i < 10000; i++) {
+                longValue.append("x");
+            }
+            String json = "{\"long\": \"" + longValue + "\"}";
+            assertEquals(longValue.toString(), JsonUtil.getString(json, "long"));
+        }
+
+        @Test
+        @DisplayName("should handle deeply nested structures")
+        void shouldHandleDeeplyNestedStructures() {
+            // Create 10 levels of nesting
+            StringBuilder json = new StringBuilder();
+            for (int i = 0; i < 10; i++) {
+                json.append("{\"level").append(i).append("\": ");
+            }
+            json.append("\"deep_value\"");
+            for (int i = 0; i < 10; i++) {
+                json.append("}");
+            }
+            
+            String result = json.toString();
+            String level0 = JsonUtil.getObject(result, "level0");
+            assertNotNull(level0);
+            assertTrue(level0.contains("deep_value"));
+        }
+
+        @Test
+        @DisplayName("should handle array with mixed types")
+        void shouldHandleArrayWithMixedTypes() {
+            String json = "{\"mixed\": [1, \"two\", true, null, {\"key\": \"value\"}, [1, 2]]}";
+            String array = JsonUtil.getArray(json, "mixed");
+            assertNotNull(array);
+            assertTrue(array.contains("1"));
+            assertTrue(array.contains("\"two\""));
+            assertTrue(array.contains("true"));
+            assertTrue(array.contains("null"));
+        }
+
+        @Test
+        @DisplayName("should handle colons in string values")
+        void shouldHandleColonsInStringValues() {
+            String json = "{\"url\": \"https://example.com:8080/path\"}";
+            assertEquals("https://example.com:8080/path", JsonUtil.getString(json, "url"));
+        }
+
+        @Test
+        @DisplayName("should handle quotes in key names")
+        void shouldHandleFirstMatchForDuplicateKeys() {
+            // JSON spec says duplicate keys have undefined behavior, but we should handle gracefully
+            String json = "{\"key\": \"first\", \"key\": \"second\"}";
+            String result = JsonUtil.getString(json, "key");
+            // Should return one of the values (typically first)
+            assertNotNull(result);
+        }
+    }
+}
+
diff --git a/src/test/java/com/chargebee/v4/transport/DefaultTransportTest.java b/src/test/java/com/chargebee/v4/transport/DefaultTransportTest.java
index 939d19f2..b728e1e5 100644
--- a/src/test/java/com/chargebee/v4/transport/DefaultTransportTest.java
+++ b/src/test/java/com/chargebee/v4/transport/DefaultTransportTest.java
@@ -1,5 +1,6 @@
 package com.chargebee.v4.transport;
 
+import com.chargebee.v4.exceptions.*;
 import org.junit.jupiter.api.*;
 import org.mockito.*;
 
@@ -208,7 +209,7 @@ void shouldHandle400ClientError() throws Exception {
                     .url(server.getUrl())
                     .build();
                 
-                ClientErrorException exception = assertThrows(ClientErrorException.class, 
+                ClientErrorException exception = assertThrows(ClientErrorException.class,
                     () -> transport.send(request));
                 
                 assertEquals(400, exception.getStatusCode());
diff --git a/src/test/java/com/chargebee/v4/transport/HttpStatusHandlerTest.java b/src/test/java/com/chargebee/v4/transport/HttpStatusHandlerTest.java
index 7b75f92e..1286b8c9 100644
--- a/src/test/java/com/chargebee/v4/transport/HttpStatusHandlerTest.java
+++ b/src/test/java/com/chargebee/v4/transport/HttpStatusHandlerTest.java
@@ -1,6 +1,7 @@
 package com.chargebee.v4.transport;
 
 import com.chargebee.v4.exceptions.*;
+import com.chargebee.v4.exceptions.codes.*;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
@@ -34,7 +35,9 @@ void shouldThrowPaymentExceptionForPaymentErrorType() {
 
         assertEquals(402, exception.getStatusCode());
         assertEquals("payment", exception.getType());
-        assertEquals("card_declined", exception.getApiErrorCode());
+        assertEquals(ErrorType.PAYMENT, exception.getErrorType());
+        // card_declined is not a known error code for 402, so it will be _UNKNOWN
+        assertNotNull(exception.getApiErrorCode());
         assertEquals("Your card was declined", exception.getMessage());
     }
 
@@ -42,7 +45,7 @@ void shouldThrowPaymentExceptionForPaymentErrorType() {
     @DisplayName("Should throw OperationFailedException for operation_failed error type")
     void shouldThrowOperationFailedExceptionForOperationFailedType() {
         Request request = createMockRequest("https://test-site.chargebee.com/api/v2/subscriptions");
-        String errorJson = "{\"type\":\"operation_failed\",\"api_error_code\":\"state_conflict\",\"message\":\"Cannot perform this operation in current state\"}";
+        String errorJson = "{\"type\":\"operation_failed\",\"api_error_code\":\"invalid_request\",\"message\":\"Cannot perform this operation in current state\"}";
         Response response = createMockResponse(400, errorJson);
 
         OperationFailedException exception = assertThrows(OperationFailedException.class,
@@ -50,14 +53,16 @@ void shouldThrowOperationFailedExceptionForOperationFailedType() {
 
         assertEquals(400, exception.getStatusCode());
         assertEquals("operation_failed", exception.getType());
-        assertEquals("state_conflict", exception.getApiErrorCode());
+        assertEquals(ErrorType.OPERATION_FAILED, exception.getErrorType());
+        assertEquals(BadRequestApiErrorCode.INVALID_REQUEST, exception.getApiErrorCode());
+        assertEquals("invalid_request", exception.getApiErrorCodeRaw());
     }
 
     @Test
     @DisplayName("Should throw InvalidRequestException for invalid_request error type")
     void shouldThrowInvalidRequestExceptionForInvalidRequestType() {
         Request request = createMockRequest("https://test-site.chargebee.com/api/v2/customers");
-        String errorJson = "{\"type\":\"invalid_request\",\"api_error_code\":\"missing_field\",\"message\":\"Required field is missing\",\"param\":\"email\"}";
+        String errorJson = "{\"type\":\"invalid_request\",\"api_error_code\":\"param_wrong_value\",\"message\":\"Required field is missing\",\"param\":\"email\"}";
         Response response = createMockResponse(400, errorJson);
 
         InvalidRequestException exception = assertThrows(InvalidRequestException.class,
@@ -65,25 +70,28 @@ void shouldThrowInvalidRequestExceptionForInvalidRequestType() {
 
         assertEquals(400, exception.getStatusCode());
         assertEquals("invalid_request", exception.getType());
-        assertEquals("missing_field", exception.getApiErrorCode());
+        assertEquals(ErrorType.INVALID_REQUEST, exception.getErrorType());
+        assertEquals(BadRequestApiErrorCode.PARAM_WRONG_VALUE, exception.getApiErrorCode());
+        assertEquals("param_wrong_value", exception.getApiErrorCodeRaw());
         assertEquals(1, exception.getParams().size());
         assertEquals("email", exception.getParams().get(0));
     }
 
     @Test
-    @DisplayName("Should throw UbbBatchIngestionInvalidRequestException for ubb_batch_ingestion_invalid_request type")
-    void shouldThrowUbbBatchIngestionExceptionForUbbBatchType() {
+    @DisplayName("Should throw APIException for ubb_batch_ingestion_invalid_request type (unrecognized type)")
+    void shouldThrowAPIExceptionForUbbBatchType() {
         Request request = createMockRequest("https://test-site.chargebee.com/api/v2/usages");
-        String errorJson = "{\"type\":\"ubb_batch_ingestion_invalid_request\",\"api_error_code\":\"invalid_format\",\"message\":\"Batch data format is invalid\"}";
+        String errorJson = "{\"type\":\"ubb_batch_ingestion_invalid_request\",\"api_error_code\":\"invalid_request\",\"message\":\"Batch data format is invalid\"}";
         Response response = createMockResponse(400, errorJson);
 
-        UbbBatchIngestionInvalidRequestException exception = assertThrows(
-            UbbBatchIngestionInvalidRequestException.class,
+        // ubb_batch_ingestion_invalid_request is not a standard error type, so it falls back to APIException
+        APIException exception = assertThrows(APIException.class,
             () -> HttpStatusHandler.validateResponse(request, response));
 
         assertEquals(400, exception.getStatusCode());
         assertEquals("ubb_batch_ingestion_invalid_request", exception.getType());
-        assertEquals("invalid_format", exception.getApiErrorCode());
+        assertEquals(ErrorType._UNKNOWN, exception.getErrorType());
+        assertEquals(BadRequestApiErrorCode.INVALID_REQUEST, exception.getApiErrorCode());
     }
 
     @Test
@@ -98,6 +106,7 @@ void shouldThrowGenericAPIExceptionForUnknownType() {
 
         assertEquals(400, exception.getStatusCode());
         assertEquals("unknown_error", exception.getType());
+        assertEquals(ErrorType._UNKNOWN, exception.getErrorType());
         assertEquals("Something went wrong", exception.getMessage());
     }
 
@@ -105,7 +114,7 @@ void shouldThrowGenericAPIExceptionForUnknownType() {
     @DisplayName("Should throw generic APIException when type is missing but message and api_error_code exist")
     void shouldThrowGenericAPIExceptionWhenTypeIsMissing() {
         Request request = createMockRequest("https://test-site.chargebee.com/api/v2/customers");
-        String errorJson = "{\"message\":\"An error occurred\",\"api_error_code\":\"general_error\"}";
+        String errorJson = "{\"message\":\"An error occurred\",\"api_error_code\":\"invalid_request\"}";
         Response response = createMockResponse(400, errorJson);
 
         APIException exception = assertThrows(APIException.class,
@@ -113,7 +122,9 @@ void shouldThrowGenericAPIExceptionWhenTypeIsMissing() {
 
         assertEquals(400, exception.getStatusCode());
         assertNull(exception.getType());
-        assertEquals("general_error", exception.getApiErrorCode());
+        assertEquals(ErrorType._UNKNOWN, exception.getErrorType());
+        assertEquals(BadRequestApiErrorCode.INVALID_REQUEST, exception.getApiErrorCode());
+        assertEquals("invalid_request", exception.getApiErrorCodeRaw());
         assertEquals("An error occurred", exception.getMessage());
     }
 
@@ -172,7 +183,7 @@ void shouldHandleEmptyErrorResponseGracefully() {
     @DisplayName("Should use default message when message field is missing")
     void shouldUseDefaultMessageWhenMessageFieldIsMissing() {
         Request request = createMockRequest("https://test-site.chargebee.com/api/v2/invoices");
-        String errorJson = "{\"type\":\"payment\",\"api_error_code\":\"card_declined\"}";
+        String errorJson = "{\"type\":\"payment\",\"api_error_code\":\"payment_processing_failed\"}";
         Response response = createMockResponse(402, errorJson);
 
         PaymentException exception = assertThrows(PaymentException.class,
@@ -182,18 +193,56 @@ void shouldUseDefaultMessageWhenMessageFieldIsMissing() {
     }
 
     @Test
-    @DisplayName("Should throw BatchAPIException when URL contains /batch/")
-    void shouldThrowBatchAPIExceptionWhenUrlContainsBatch() {
+    @DisplayName("Should throw APIException for batch URL (batch handling not yet implemented)")
+    void shouldThrowAPIExceptionForBatchUrl() {
         Request request = createMockRequest("https://test-site.chargebee.com/api/v2/batch/customers");
-        String errorJson = "{\"type\":\"invalid_request\",\"api_error_code\":\"batch_error\",\"message\":\"Batch operation failed\"}";
+        String errorJson = "{\"type\":\"invalid_request\",\"api_error_code\":\"invalid_request\",\"message\":\"Batch operation failed\"}";
         Response response = createMockResponse(400, errorJson);
 
-        BatchAPIException exception = assertThrows(BatchAPIException.class,
+        // Batch URL special handling would need to be added to HttpStatusHandler template
+        // For now, it falls back to the standard error type handling
+        InvalidRequestException exception = assertThrows(InvalidRequestException.class,
             () -> HttpStatusHandler.validateResponse(request, response));
 
         assertEquals(400, exception.getStatusCode());
         assertEquals("invalid_request", exception.getType());
-        assertEquals("batch_error", exception.getApiErrorCode());
+        assertEquals(BadRequestApiErrorCode.INVALID_REQUEST, exception.getApiErrorCode());
+    }
+
+    @Test
+    @DisplayName("Should handle strongly-typed ApiErrorCode enums")
+    void shouldHandleStronglyTypedApiErrorCodeEnums() {
+        Request request = createMockRequest("https://test-site.chargebee.com/api/v2/customers");
+        String errorJson = "{\"type\":\"invalid_request\",\"api_error_code\":\"duplicate_entry\",\"message\":\"Duplicate entry found\"}";
+        Response response = createMockResponse(400, errorJson);
+
+        InvalidRequestException exception = assertThrows(InvalidRequestException.class,
+            () -> HttpStatusHandler.validateResponse(request, response));
+
+        // Verify strongly typed enum
+        ApiErrorCode apiErrorCode = exception.getApiErrorCode();
+        assertTrue(apiErrorCode instanceof BadRequestApiErrorCode);
+        assertEquals(BadRequestApiErrorCode.DUPLICATE_ENTRY, apiErrorCode);
+        assertTrue(apiErrorCode.isKnown());
+        assertEquals("duplicate_entry", apiErrorCode.getValue());
+    }
+
+    @Test
+    @DisplayName("Should handle unknown api_error_code with _UNKNOWN enum")
+    void shouldHandleUnknownApiErrorCodeWithUnknownEnum() {
+        Request request = createMockRequest("https://test-site.chargebee.com/api/v2/customers");
+        String errorJson = "{\"type\":\"invalid_request\",\"api_error_code\":\"future_unknown_code\",\"message\":\"Unknown error\"}";
+        Response response = createMockResponse(400, errorJson);
+
+        InvalidRequestException exception = assertThrows(InvalidRequestException.class,
+            () -> HttpStatusHandler.validateResponse(request, response));
+
+        // Verify unknown error code handling
+        ApiErrorCode apiErrorCode = exception.getApiErrorCode();
+        assertEquals(BadRequestApiErrorCode._UNKNOWN, apiErrorCode);
+        assertFalse(apiErrorCode.isKnown());
+        assertNull(apiErrorCode.getValue()); // _UNKNOWN has null value
+        assertNull(exception.getApiErrorCodeRaw()); // Raw value is null for _UNKNOWN
     }
 
     private Request createMockRequest(String url) {